What You Really Need to Know About a MPLS Network

MPLS… or Multi-Protocol Label Switching…. seems to be the buzzword for connecting company data networks these days. But MPLS is really nothing new. It’s been around awhile actually. Maybe now it’s just gaining more popularity and thus noticeable public acceptance and notoriety. Rightfully so too. MPLS offers lots of advantages over traditional T1 point-to-point WAN architectures.

But….. to decide if MPLS is really a good fit for your network requirements….. there’s some things you need to understand first.

There’s no one “MPLS Service”. A lot of what you get will depend how the service provider has Engineered and built their core network. Bear in mind that many carriers don’t own the whole network, but will piece together a service from other carriers networks, or will interconnect with other carriers to extend their reach.

Cell-mode MPLS was mentioned: basically this is ATM which has been retro-fitted with MPLS. Be careful with this for VoIP applications because it can use bandwidth very inefficiently.

MPLS can support QoS, but many services aren’t engineered with this, or only with very basic prioritization. Also the services are very often structured to reduce the potential complexity and to ensure the network can cope. Bear in mind a typical MPLS router can only carry a percentage of “high-priority, real time” traffic. If everyone sends all their data as high priority then the benefit is lost, and the network may suffer. Usually QoS is provided as a small number of service classes, typically 3 or 4.

The biggest bottleneck in any such service is normally the tail circuit to each of your premises. If you move from a T1 mesh to a MPLS service then you will likely find that some sites need more bandwidth than others. Tracking the requirement for this bandwidth is usually your problem, although the service provides may give you some reporting tools to assist with this. I would avoid service providers who cannot offer this as it will make it very difficult for you to manage your bandwidths.

If you factor in multiple service classes then your management of these tail circuits gets more complex as you no only have to work out how much bandwidth is required for each tail circuit, but how much of it should be reserved for each service class.

Regarding resilience, within the service providers core, the service is normally highly resilient to failures. However, when failures do occur, very often (depending on how the service is engineered) the rerouting can take a second or two. During this network re-convergence you will lose packets. Depending on the protocol your traffic uses this can be unimportant or devastating. For instance, some VPN and VoIP services don’t survive this well.

Normally resilience is not automatically provided all the way to the customer. Typically you will have one tail circuit and one router at each site. If either fails (or if the Service provider’s PE router has problems) you will lose service to the site, totally.

If this is an issue, you need to factor in dual connections. There’s multiple ways of doing this, and different service providers will offer different options. Make sure you get your Network Engineer involved as the devil is in the detail here, and some options which sound like they provide a fantastic level of resilience may not be as good as they sound, depending on how your internal network is configured.

And, of course, the key to all of this is SLAs: what do they offer? What happens if they break them? How do they report them to you?

Generally speaking, MPLS services are a great way to run a multi-site data network including VoIP services. I have seen many carriers and their customers doing this successfully for years.

Strictly speaking MPLS does not provide QoS. QoS is done by prioritizing traffic, and most IP routers, even those on the backbone of the Internet, can do this. The difference is whether they are configured to do this or not. In an MPLS network MPLS is provided by standard router features. MPLS technology (specifically Traffic Engineering) gives the carrier better control over how this traffic is prioritized and routed (and restored in case of network fault). All this does is give them the confidence to support SLAs.

As I mentioned, “QoS” is provided as a set of “service classes”. Typically these are things like “real-time”, “high-priority” and “everything else”. Mapping actual traffic into these classes can be done in a few different ways, but this is largely up to you to control. For instance, you could quite easily put web-browsing traffic into “real time” although this would normally be a dumb thing to do.

I would suggest the case for MPLS in terms of performance, cost and continuity against ‘traditional’ or ‘legacy’ data networks is now pretty robust, i.e. MPLS provides significant advantages in all 3 areas.

The key considerations when migrating include provider selection, access media (e.g. using Ethernet rather than SDH/SONET), the decision on procuring a managed or unmanaged service (often called wires-only) and the providers ability to map their CoS/QoS to the applications you need to support. This is especially important if you are operating any proprietary applications.

There is also an increasing trend to use WAN Optimization/application management solutions either as a value added service from the provider or from an alternative integrator or indeed doing it in house. This is important say for voice or applications such as CITRIX.

MPLS providers also now offer a whole suite of value added services such as integrated internet, managed network based firewalls and remote user support. If these are important to you make sure the providers demonstrate how this is achieved.

In selecting your provider ensure they have good geographic coverage in your areas and experience within your market segment. I always recommend requesting up to 3 references. Equally I think it is wise to understand how important a client you will be to the provider. It’s all well and good using the market leader (say according to Gartner)….. but you’ll often get a better service from a provider who values and really wants your business.

Need help designing the right MPLS configuration for your network? There’s a ton of resources….. free and fee….. listed and discussed at Broadband Nation.

Yoga-Based Education System

If anybody has to practice yoga at a young age, people would remark, “Yoga, so early?” Even now many people still think that yoga is only a pastime for retired people, but I always felt that yoga has more to do with the evolution of the human mind and the human body.

Mind preparation for yoga

When you want to prepare a garden, grow flowers and trees, what do you do? Do you just sprinkle seeds? Many people might do that, but nothing would grow. First you have to prepare the soil, make it soft and pull out the weeds. Then you can sow the seeds and they will grow into nice flowers and fruit-bearing trees. The same law applies to the human mind. The mind has to be prepared for accepting the seeds.

The mind assumes many stages. There are certain stages where nothing goes into the head. Surely you have met such people in your life. Whatever you tell them falls on deaf ears; nothing penetrates their brain. They are like hard soil, and the best of seeds will not grow there. No matter

how much you work at it. Then there are some people who are like soft soil. When you tell them something, they are completely responsive. These people have what are called receptive minds. Therefore, what is important in yoga is that we try to transform the quality of consciousness. They everything can be planted in the mind without any obstruction.

Place of Super Mind

In fact, millions of years ago pineal gland played an active role in the development of the human brain. Therefore, people of those times has greater psychic and spiritual qualities and better control over their emotions, but with the passage of time the pineal gland has followed a course of degeneration.

In yoga, the pineal gland is said to be the physical correlate of ‘ AJANA CHAKRA’. Mystics and occultists refer to it as the third eye and philosophers call it the super mind. The pineal gland is very active in children, but by the time they reach the age of eight or ten it begins to calcify, and in elderly people it has little or no role to play in life.

This is very unfortunate because in yoga the pineal gland is considered to be the controlling and monitoring station in the brain. Just as an airport has a control tower. The human brain also has a directing, regulating and blocking tower, which controls all the faculties of the brain. In yoga we call this control station ‘AJANA CHAKARA’ ; the word ‘AJANA’ itself means monitoring, ordering or regulating.

When the pineal gland starts to degenerate, the pituitary gland comes into action and the action and the emotions shoot up. This is the reason why so many children become emotionally unbalanced and disturbed during their adolescent and adolescent years.

Adrenal glands have a very important role to play in the child’s moral behaviour. Usually, those with criminal tendencies have a overactive adrenal system.

Yogic system of education

There are various processes through which knowledge can be implanted in the human brain. During the last few decades many methods have been introduced into the educational system. The oldest method, of course, is teaching in a classroom with a cane. When the child is intelligent give him high mark, and when he is dull give him a big zero. The teacher gives a lecture, writes the points on a blackboard and the student is expected to understand. If he does not then give him a cross. This is a system of teaching, but not a system of education.

At every moment of our lives, right from birth, we are constantly receiving impressions, but these are not registered in the same form as when they went in. they are registered in the form of symbolic vibrations. Have the educators developed a system to teach children which works like this?

Geography, history, mathematics, physics, chemistry, biology, botany or anything can be taught through symbolic methods. This is the form of education which has to be used for the dull type of student. You can explain a certain concept to an intelligent child and he will understand it, but the dull child will not know what you are talking about because his conscious brain, his intellect, is incapable of receiving the knowledge that you are giving him. Therefore, you will have to transmit the knowledge in a symbolic form directly into his subconscious mind. This is precisely the system of education in yoga.

Why Are Metals Good Conductors?

Different metals are often employed for various applications because they are known for being good conductors of both heat and electricity. All of the appliances that we find in our homes and workplaces, such as kettles and computers, use metal for one reason or another. But why are they such good conductors? How does it all work?

Generally, atoms will tightly hold onto their electrons, not allowing them to move very much (if at all). In metal, however, atoms hold onto their electrons more loosely, allowing some of them to even be free moving. This is because the electrons form a metallic bond of sorts with each other, creating a moving sea vibrating electrons. They drift aimlessly through the metal, helping to give it it’s various properties, including strength.

Electrical conductivity

This term refers to a metal’s ability to conduct an electrical current, such as in a refrigerator or television. The outer electrons of the atoms are loosely bonded and are free to move through the material. When an electrical current is applied to a metal, it causes the free moving electrons to flow, which allows the current to pass through and be moved on.

Thermal conductivity

This term, on the other hand, refers to a metal’s ability to conduct heat, such as in a toaster or heater. The electrons nearest the heat source begin to warm up, causing them to vibrate fairly fast. In colliding with the cooler, slower moving electrons around them, the hot electrons transmit this heat energy on. Metal is such a good conductor of heat because their electrons are packed so closely together, allowing the vibrations to be passed on very quickly.

Metals are quite often cool to the touch, causing many people to believe that they are actually good conductors of cold, not heat. This, however, is a common misconception – metals are able to quickly absorb heat from their surfaces, including from human skin. It is this loss of heat that causes metal surfaces to feel cold underneath our hands.

When people ask why metals are good conductors of both heat and electricity, the short answer is because of the way their electrons are able to freely move around. To fully get into the specifics of how each element is effectively conducted by different alloys, you would probably have to attend physics classes in order to understand the processes. Having a basic understanding, however, should be enough to show why metal is so useful.

Legal Protection for Foreign Direct Investments (FDIs) in Nigeria

For healthy and continuous in flow of Foreign Direct Investments (FDIs) to Nigeria, the country has over the years put in place friendly legal framework for Foreign Direct Investments (FDIs) protection.

In this Foreign Investors’ Guidelines for Doing Business in Nigeria Series, we shall be examining the legal mechanisms put in place for the purpose of encouraging an increasing FDIs inflow and ensuring foreign investors’ confidence in the country.

We shall be discussing foreign investors’ protections ranging from certainty of arbitral proceedings and other dispute resolution mechanisms in the country.

The fact with modern economic systems is that no country can be an island economically; Foreign Direct Investment (FDI) protection is very essential to the successful attainment of foreign investors’ business objective(s) and economic development of any economy.

There are steps that host countries can lawfully take in the exercise of their sovereignty and power can lead to depriving foreign investors of reaping the fruits of their investments.

Host government actions that can affect foreign investment adversely includes nationalization; the act of a government taking control of a private enterprise and converting it to state or public ownership.

Expropriation; the act of a government taking possession of or otherwise meddling with privately held assets or property for the use and benefit of the public, or in the public interest.

The legislative and administrative acts of the government as government action can also have adverse effects on foreign investors’ businesses in Nigeria.

This is the indirect or creeping form of expropriation. The only difference is that, it mode of operation shifted attention from the physical and actual taking-over of an investor’s assets to the legislative and administrative acts of the government.

While not depriving a foreign investor of the ownership of an asset in this type of government control, it is capable of significantly reducing the value of properties and investments of the foreign owner.

Foreign investors don’t like investing in country’s with risk such as arbitrary revocation of a license; permit or a concession after the investor has made the requisite investments.

The advancement and expansion of international business relationships and the importance of foreign direct investment to the economic development of Nigeria has made the country to put in place some foreign business protection laws for the purpose of encouraging foreign investors.

Nigeria has performed greatly in providing protections to potential foreign investors.

Investment Treaties

In spite of the provisions of Section 12 of the Nigerian Constitution, investment treaties entered by the country are binding on, and enforceable against Nigeria upon ratification under the principle of ‘pacta sunt servanda’.

Also, by a literal application of Article 31 of the Vienna Convention on the Law of Treaties which provides that a treaty shall be interpreted in good faith in agreement with the ordinary meaning to be given to the terms of the treaty.

Bilateral Investment Treaties (BITs): Nigeria entered into its first Bilateral Investment Treaty (BIT) with Germany in 1979 which came into force in 1986.

According to finding from my investigation Nigeria has entered into 28 Bilateral Investment Treaties (BITs) between 1986 and November, 2015.

Of the total number, 13 are currently in force, 14 are signed and 1 repealed. The Bilateral Investment Treaties (BITs) currently in force are the ones entered into with Finland, France, Germany, Italy, Netherlands, Romania, Serbia, Spain, South Korea, Sweden, Switzerland, Taiwan, and United Kingdom.

The 14 BITs which have been signed by Nigeria but are yet to enter into operation were signed as far as back as 1996.

In addition to the usual investment protection standards, these BITs provide that a contracting state shall not damage by irrational or unfair means the maintenance, management, disposal of investment in its territory of nationals or companies of the other Contracting Party.

And the same recompense for losses suffered due to a safety event made to a domestic investor shall be allowed to the investor from the other contracting state.

These BITs also provide for the right of subrogation allowing foreign investors to obtain suitable investment insurance and for these investment insurance providers to seek remedy on their behalf from Nigeria.

The BITs that are presently in force have also made satisfactory requirements for the standard investment protection. These include fair and equitable treatment, umbrella clauses, most favoured nation status, national treatment, obligations against arbitrary and discriminatory measures and security.

Multi-lateral Investment Treaties (MITs): Economic Community of West African States (ECOWAS) treaty is one of the famous MITs Nigeria have entered. The ECOWAS treaty was signed on 28th May 1975; it came in into force on the 20th June, 1975.

The treaty currently has 15 signatories who are member states of ECOWAS.

Article 2 of the Treaty gives ‘Community Enterprise’ status to businesses whose equity capital is owned by two or more member states, and citizens or institutions of the Community.

Article 16 of the Treaty provides that Community Enterprise shall be accorded favourable treatment with regards to incentives and advantages, and shall not be nationalised or expropriated by the government of any member state except for valid reasons of public interest, and subject to the payment of prompt and adequate compensation.

Organization of Islamic Conference (OIC) investment treaty is another MIT Nigeria has entered into in relation with providing favourable conditions for foreign investments in the country.

OIC is a treaty with an Agreement on Promotion, Protection and Guarantee of Investments among Member States of the Organization of the Islamic Conference, which came into force in September, 1986.

Chapter 2 of the Treaty mandates all member states of the Organization of Islamic Countries to provide adequate security and protection to the invested capital of an investor who is a national of another contracting member state.

The terms of protection specifically include the enjoyment of equal treatment, undertaking not to adopt measures that may directly or indirectly affect the ownership of the investor’s capital or investment and not to expropriate any investment except it is in the public interest and on prompt payment of adequate compensation.

Host states are further obligated to guarantee free repatriation of any capital and returns due to an investor.

Conventions to which Nigeria is a Signatory:

The country is signatory to a number of Conventions which have been entered into for the purposes of protecting foreign direct investment.

The most significant convention in this regard is the Convention for the Settlement of Investment Disputes between States and Nationals of Other States (ICSID Convention).

International Centre for the Settlement of Investment Disputes (ICSID) as an arbitral institution under the World Bank Group is a fully integrated, self-contained arbitration institution that provides standard arbitration clauses, arbitration proceedings rules, arrangements for venues, financial arrangements and administrative supporting including the appointment of arbitrators to parties.

Convention for the Settlement of Investment Disputes between States and Nationals of Other States (ICSID) primarily provides for the settlement of investment disputes between investors and sovereign host states.

It has also taken the necessary legislative measures to make the Convention’s resolution effective in Nigeria by enacting it as a domestic legislature in the International Centre for Settlement of Investment Disputes (Enforcement of Awards) Decree No. 49 of 1967.

Another significant investment protection convention Nigeria has entered into is the New York Convention on the Recognition and Enforcement of Foreign Arbitral Awards.

New York Convention was adopted by the United Nations in June, 1958 and it mandates domestic courts in signatory countries to give effect to arbitration agreements, and to also recognise and enforce valid arbitral awards given in other signatory states.

The New York Convention in other words is particularly significant for the enforcement of arbitral awards resulting from non-ICSID investment arbitration proceedings.

In an attempt to bring into conscious awareness the legal guidelines to undertaking business in Nigeria to intended foreign investors, we shall specifically be reviewing domestic legislations and investment treaties which collectively make up the legal framework for foreign investment protection in the country.

The Domestic Legal Framework:

The notable investment legislation in Nigeria is the Nigerian Investment Promotion Commission Act, CAP N117 Laws of the Federation of Nigeria (“NIPC Act”).

The NIPC Act provides the fundamental and suitable legal framework for the protection of foreign investors in the country. Part 5 of the NIPC Act provides that foreigners may invest and participate in any enterprise in Nigeria.

They are assured unrestricted transfer of funds attributable to the investment such as profits, dividends, payments in respect of loan servicing, and the remittance of proceeds obtained from the sale or liquidation of assets or any interest in the venture through an approved dealer in freely convertible currency.

Section 25 of the NIPC Act clearly provides that no enterprise shall be expropriated or nationalised without prompt payment of compensation; the same section also provides a protection clause to an investor to claim “creeping” expropriation by establishing that the acts complained of indirectly results to expropriation or have expropriatory tendency.

Lastly, the NIPC Act provides that disputes between a foreign investor and any government in Nigeria arising from an investment shall be submitted to arbitration within the framework of any investment treaty entered into between the government of Nigeria and any state of which the foreign investor is a national.

It further provides that where there is a disagreement between the Nigerian government and the foreign investor on the mode of dispute settlement, the dispute shall be submitted to ICSID for arbitration.

Foreign investor is thus at liberty in Nigeria to institute arbitration proceedings against a government even after bringing a claim or counterclaim against the government in a court or domestic arbitration.

Another domestic legislation that provides protection to foreign investors is the Foreign Exchange (Monitoring and Miscellaneous Provisions Act) CAP F34.

Section 15 of this Act provides that any person may invest in any business venture with foreign currency or capital imported into Nigeria through an authorized dealer who will issue a Certificate of Capital Importation to the foreign investor.

Sub-section (4) of the same section in addition guarantees unconditional transferability of funds in freely convertible currency of any such monies arising from an investment made in Nigeria with foreign currency, including dividends and profits, payments in respect of loan servicing, and remittances of the proceeds of sale or liquidation of assets.

A similar provision on repatriation is also found in Section 18 of the Nigeria Export Processing Zones Act, CAPN107 (“NEPZA Act”).

Section 18 of the NEPZA Act provides that foreign investors who invest in outlined businesses within an export zone shall be eligible to remit profits and dividends earned in the zone and repatriate foreign capital investment at any time with capital appreciation of the investments.

Other foreign investors’ protection laws are the Arbitration and Conciliation Act. The act gives foreign investors the opportunity to determine the mode of settling disputes that may arise out of their investments without resort to litigation in domestic (Nigeria) courts.

With the anticipation that such settlement will unfailingly and efficiently protect and enforce the rights of foreign investors and their investments provides a framework for domestic arbitration it also makes provisions for international commercial arbitration which is more preferable by foreign investors.

Section 56(2) (d) defines ‘international arbitration’ to include any arbitration that the parties have expressly agreed in the arbitration agreement to treat as international arbitration. The Act provides that every arbitration award is capable of enforcement under the New York Convention.

Nigeria’s entries into these investment treaties and its enactment of the Conventions into domestic legislation have made the protection mechanism part of Nigeria’s legal framework for protection of Foreign Direct Investments (FDIs) friendly and convenient to actual and potential foreign investors.

Knowing Reiki Massage

Reiki massage is a form of energy healing treatment that sends out energy and is directed into the chakra points. It is completely harmless and safe to use because it does not involve heavy skin to skin contact or massage.

Reiki massage is the treatment wherein spiritual energy is used and goes directly through the body’s chakra points. It incorporates healing in varying aspects of the recipient and may have little or no skin-to-skin contact. The word “reiki” is a Japanese kanji or Japanese words that are put together. Rei means “universal spirit” and ki means “life energy” and reiki means “universal life energy”. Massage is the process wherein the therapist rubs different parts of the body for an invigorating and refreshing feeling. Some therapists that are trained in massaging and also took Reiki attunement classes are called Reiki therapists and sometimes they use reiki and massage altogether to provide the maximum health benefits the recipient can get.

This massage is expected to have positive results such as providing pain relief and overall physical, mental, emotional or spiritual wellness. Commonly, this massage does not incorporate skin contact from the practitioner to the recipient, but the practitioner’s hand remains still and transmits reiki energy into the recipient’s body, which is spiritually guided and gives healing results. It is believed to treat muscle pain, any form of injury, tension, TMJ (also known as lock-jaw), stress and so much more.

The Reiki massage can be used in two different ways.

Healing from a distance

The recipient is advised to go to a relaxing place of their choice or set up a comfortable place inside their house where they will not be disturbed from any event in and outside their home. The practitioner will start the treatment and transmit Reiki energies from their body to the recipient. This all happens from a distance.

In-person healing

This form of healing is used when the practitioner is present and can interact physically with the recipient. The recipient is advised to lie on a mat or preferably a massage table and not advised to be naked. It is important to be completely comfortable and open to the healing energy one will receive during treatment. The treatment area should be relaxing; put aromatherapy scents around the room, play soothing music, etc. just to place the recipient in a relaxed state. The practitioner transmits reiki energies from their hands to the recipient’s body by gently touching different parts of the body.

The beauty of Reiki massage is that everybody can enjoy them but everybody can learn how to give them as well.

Defining Wind Generated Electrical Power and Discussing Pros and Cons of the Technology

Introduction

Wind generated electrical power exists through harnessing wind-power energy with turbines. To fully understand wind generated electrical power, one must understand how wind powered electricity is made; resources needed to utilize wind power; types and sizes of wind turbines; building a wind turbine; potential positive and negative impacts of the technology; where wind powered electricity can be effectively generated; and, offsetting the costs of wind powered electrical technology.

How Wind Powered Electricity is Made

The technology of wind generated electrical power functions by creating electricity through the use of various styles of wind turbines. Initially, one might ask, “So how do wind turbines make electricity?” Simply said, a wind turbine works the opposite of a fan. Instead of using electricity to make wind, like a fan, wind turbines use wind to make electricity. The wind turns the blades, which spin a shaft, which connects to a generator and makes electricity.

Resources Needed to Utilize Wind Power

The primary resource of Wind powered technology is, of course, wind. Wind is very abundant in many parts of the United States and other parts of the world. Wind resources are branded by wind-power density classes, ranging from class 1 (the lowest) to class 7 (the highest). Good wind resources (e.g., class 3 and above, which have an average annual wind speed of at least 13 miles per hour) are found in many areas. Wind speed is a critical of wind resources, because the energy in wind is proportionate to the cube of the wind speed. In other words, a stronger wind means more power.

Wind resource development requires land and may compete with other uses of that land, and those alternative uses may be more highly valued than electricity generation. However, wind turbines can be positioned on land that is also used for grazing or even farming. Wherever a wind farm is to be built, roads are cut to make way for shipping parts. At each wind turbine location, the land is graded and the pad area is leveled. Wind energy also requires the building of wind turbines.

Types and Sizes of Wind Turbines

Modern wind turbines fall into two basic groups: the horizontal-axis variety and the vertical-axis design, like the eggbeater-style Darrieus model, named after its French inventor. Horizontal-axis wind turbines typically either have two or three blades. These three-bladed wind turbines are operated “upwind,” with the blades facing into the wind. Darrieus models, or vertical-axis wind turbines, have two vertically oriented blades revolving around a vertical shaft.

In addition to different types, there are many different sizes of wind turbines. Utility-scale turbines range in size from 100 kilowatts to as large as several megawatts. Larger turbines are grouped together into wind farms, which provide bulk power to an electrical grid. Single small turbines, below 100 kilowatts, are used for homes, telecommunications, or water pumping.

Small turbines are sometimes used in connection with diesel generators, batteries, and photovoltaic systems. These systems are called hybrid wind systems and are typically used in remote, off-grid locations, where a connection to the utility grid is not available.

Building a Wind Turbine

The first step in building a wind turbine is setting up the tower where the fiberglass nacelle is installed. The nacelle is a strong, hollow casing that contains the inner workings of the wind turbine. Usually made of fiberglass, the nacelle contains the main drive shaft and the gearbox. Its inner workings also contain blade pitch and yaw controls. The nacelle is assembled and attached onto a base frame at a factory.

The most diverse use of materials and the most experimentation with new materials occur with the blades. Although the most dominant material used for the blades in commercial wind turbines is fiberglass with a hollow core, other materials in use include lightweight woods and aluminum. Wooden blades are solid, but most blades consist of a skin surrounding a core that is either hollow or filled with a lightweight substance such as plastic foam or honeycomb, or balsa wood. Wind turbines also include a utility box, which converts the wind energy into electricity and which is located at the base of the tower. The generator and electronic controls are standard equipment whose main components are steel and copper. Various cables connect the utility box to the nacelle, while others connect the whole turbine to nearby turbines and to a transformer.

Potential Positive and Negative Effects of Wind Powered Electricity

There are a variety of potential positive and negative impacts of wind powered technology.

Potential positive impacts include:

• Wind energy is friendly to the surrounding environment, as no fossil fuels are burnt to generate electricity from wind energy.

• Wind turbines take up less space than the average power station. Windmills only have to occupy a few square meters for the base; this allows the land around the turbine to be used for many purposes, for example agriculture.

• Newer technologies are making the extraction of wind energy much more efficient. The wind is free, and we are able to cash in on this free source of energy.

• Wind turbines are a great resource to generate energy in remote locations, such as mountain communities and remote countryside.

• Wind turbines can be a range of different sizes in order to support varying population levels.

• When combined with solar electricity, this energy source is great for developed and developing countries to provide a steady, reliable supply of electricity.

Potential negative impacts include:

• Wind turbines generally produce less electricity than the average fossil fuelled power station, requiring multiple wind turbines to be built.

• Wind turbine construction can be very expensive and costly.

• Wind turbines can have a negative impact to surrounding wildlife during the build process.

• The noise pollution from commercial wind turbines is sometimes similar to a small jet engine.

• Protests and/or petitions usually confront any proposed wind farm development. People feel the countryside should be left intact for everyone to enjoy its beauty.

Where Wind Powered Electricity Can be Effectively Generated

Places in the world where wind blows strong and often, people and businesses can harness the wind as an option to use in the generation of electricity. Globally, these places include much of North America, southern South America, Greenland, most of Europe, Northern Africa, eastern Asia, most of Australia, and anywhere there are mountains or large hills. The top 5 countries producing electrical wind power in 2007 were: Germany, United States, Spain, India and China, respectively.

Considerable wind speeds also occur across oceans and large water bodies. Since most of the world’s population lives near oceans, wind farms with strong offshore and onshore breezes could produce an abundant amount of electricity. On land in the USA, the major wind corridor is the Great Plains which includes the states of North Dakota, South Dakota, Nebraska, Kansas, Oklahoma and Texas. The wind corridor also extends into the states west to the great mountains west, including eastern Montana, Wyoming, Colorado, and New Mexico. There are also considerable wind resources in eastern and southern Minnesota and the entire state of Iowa, diminishing south through Missouri and east through southern Wisconsin and northern Illinois, Indiana and Ohio. Parts of New York and the New England states also have considerable wind.

The Department of Energy (DOE) estimates that wind power could supply the US with 100% of its electricity, just from the Great Plains wind corridor or from offshore wind farms alone. According to the “Pickens Plan,” a $10 billion wind farm with 2500 generators can supply enough energy for 1.3 million homes, and for $1 trillion the Great Plains wind corridor could supply 20% of America’s electricity. That would be about 250,000 generators to supply 130 million homes.

In a report published by the U.S. Department of Energy, “20% Wind Energy by 2030: Increasing Wind Energy’s Contribution to U.S. Electricity Supply,” that report concluded that:

• Reaching 20% wind energy will require enhanced   transmission  infrastructure, streamlined siting and permitting regimes, improved reliability and operability of wind systems, and increased U.S. wind manufacturing capacity.

• Achieving 20% wind energy will require the number of turbine installations to increase from approximately 2000 per year in 2006 to almost 7000 per year in 2017.

• Integrating 20% wind energy into the grid can be done reliably for less than 0.5 cents per kWh.

• Achieving 20% wind energy is not limited by the availability of raw materials.

• Addressing  transmission  challenges such as siting and cost allocation of new  transmission  lines to access the nation’s best wind resources will be required to achieve 20% wind energy.

Offsetting the Costs of Wind Powered Electrical Technology

Although wind generated electrical power seems to be an unlimited resource, and, the best wind sites appear to be competitive with market electricity prices in most U.S. regions, several factors exist that make it a less appealing source of alternative energy in terms of economic cost. First off, wind is not uniformly priced resource. Its costs vary widely depending on project scale, wind speed, region, and other factors. Second, the benchmark for comparison with wind to other fuels varies regionally. Third, extra revenue is required to make a project viable, sunk costs are considerable.

To offset the factors that make wind powered electricity a less appealing source of alternative energy and promote its continued growth, wind energy in many areas receives some financial or other support to encourage development. Wind energy benefits from subsidies either to increase its attractiveness or to compensate for subsidies received by other forms of production, such as coal and nuclear, which have significant negative impacts. In the United States, wind power receives a tax credit for each Kilowatt hour produced; that was 1.9 cents per Kilowatt hour in 2006. The tax the credit has a yearly inflationary adjustment. Many American states also provide incentives, such as exemption from property tax, mandated purchases, and additional markets for “green credits.” The Energy Improvement and Extension Act of 2008 contain extensions of credits for wind, including micro-turbines.

Secondary market forces also provide incentives for businesses to use wind-generated power, even if there is a premium price for the electricity, socially responsible manufacturers pay utility companies a premium that goes to subsidize and build new wind power groundwork. Companies use wind-generated power, and in return they can claim that they are making a “green” effort.

Undoubtedly, further tax credits, subsidies and incentives will also be needed to achieve the goal of 20% Wind Energy by 2030. Today, wind power approximately accounts for about 2% of the electricity generated in the United States.

Summary

The technology of wind generated electrical power functions by creating electricity through the use of various styles of wind turbines is a very viable alternative energy. Although wind generated electrical power does have some negative impacts, this author feels that in terms of long-term cost and benefit compared with other types of energy, such as the burning of fossil fuels, using a renewable resource such as wind generated electrical power economically, environmentally, and socially is making more and more sense.

Everything You Ever Wanted To Know About Condoms

If there was ever an invention to make sex as safe as possible, it has to be the condom. Not only do they prevent the spread of sexually transmitted diseases, but they’re very effective at preventing pregnancy too. No other form of contraception is so reliable and versatile. So what’s not to love?

Buying them

So you’re shy about asking for them? Supermarkets and gas stations carry condoms these days – you can buy them from a machine in the washroom. Sex clinics give them out by the handful for nothing. And if you still feel weird about getting your hands on condoms – just consider how it would feel buying medicine to treat an STD instead.

Carrying them

Is it presuming too much to take condoms on a date? Frankly, that attitude hasn’t been seen since the fifties. So the girl might realise you do have sex and you wanted it with her. Is that an insult? In any case, you don’t have to take them out your pocket and wave them around. If you get to the point where you need one, you’ll both be happy to see that little foil wrapper, never mind who was carrying it!

Using them

Remember the classes where you practised with a banana? Do yourself a favor, practise with the real thing. Use a whole pack if you need to – keep trying till you know how to get one on properly. You won’t be able to put on a condom if your penis isn’t fully erect – but remember that the penis releases fluid that can spread STIs or contain sperm even before it’s erect. Remember to pinch the ‘teat’ at the end before you unroll the condom down your penis – you might want to leave a bit more space at the top to prevent the condom from splitting. Keep this teat pinched between your fingers as you unroll the condom, and make sure it’s fully covering your penis before and during sex. Don’t feel shy about interrupting your lovemaking to put one on – that pause can only build the excitement!

Last words

Oil based lubes, sharp fingernails, jewellery and out of date condoms are all recipes for disaster. Use a special lubricant. Some people find they have an allergy to latex – condoms now come in allergy-friendly latex-free varieties. In fact, there are now a vast number of different shapes, colors, sizes and flavors of condom. Experiment to see which ones you and your lover prefer – perhaps a ribbed variety for more stimulation or a condom with extra lube for very sensual sex. You should use a condom or dental dam for oral sex too, and change condoms for every new orifice or sex act.

Finally, to get rid of a condom, wrap it and bin it. Never flush a condom down the toilet.

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Infectious Diarrhea

Clinical Presentation: Every year throughout the world more than 5 million people-most of them kids younger than 1 year-die of acute infectious looseness of the bowels. Although death is really a uncommon outcome of infectious diarrhea within the United States, morbidity is substantial.

It is estimated that you will find more than 200 million episodes each year, resulting in 1.8 million hospitalizations at a price of $6 billion per year. The morbidity and mortality attributable to diarrhea are largely due to loss of intravascular volume and electrolytes, with resultant cardiovascular failure. For example, adults with cholera can excrete a lot more than 1 L of fluid per hour.

Contrast this with the typical volume of fluid lost daily within the stools (150 mL), and it is clear why massive fluid losses connected with infectious diarrhea can lead to dehydration, cardiovascular collapse, and death. Gastrointestinal (GI) tract infections can present with primarily upper tract symptoms (nausea, vomiting, crampy epigastric pain), small intestine symptoms (profuse watery diarrhea), or large intestine signs or symptoms (tenesmus, fecal urgency, bloody looseness of the bowels).

Sources of infection consist of person-to-person   transmission  (fecal-oral spread of Shigella), water-borne  transmission  (Cryptosporidium), food-borne  transmission  (Salmonella or S aureus foods poisoning), and overgrowth following antibiotic administration (Clostridium difficile).

Etiology: A wide range of viruses, bacteria, fungi, and protozoa can infect the GI tract. However, in the majority of instances, symptoms are self-limited, and diagnostic evaluation isn’t performed. Individuals presenting to medical attention are biased toward the subset with more severe signs or symptoms (eg, high fevers or hypotension), immunocompromise (eg, HIV or neutropenia), or prolonged duration (eg, chronic diarrhea defined as lasting 14 days). An exception is large outbreaks of food-borne sickness, in which epidemiologic investigations may detect individuals with milder variants of illness.

Pathogenesis: A comprehensive approach to GI tract infections starts using the classic host-agent-environment interaction model. A quantity of host elements influence GI tract infections. Individuals at extremes of age and with comorbid conditions (eg, HIV infection) are at higher risk for symptomatic infection.

Medications that alter the GI microenvironment or destroy typical bacterial flora (eg, antacids or antibiotics) also predispose individuals to infection. Microbial agents responsible for GI sickness could be categorized according to kind of organism (bacterial, viral, protozoal), propensity to attach to various anatomic sites (stomach, little bowel, colon), and pathogenesis (enterotoxigenic, cytotoxigenic, enteroinvasive).

Environmental elements can be divided into three broad categories based on mode of  transmission : (1) water borne, (2) foods borne, and (three) individual to person. GI tract infections can involve the stomach, leading to nausea and vomiting, or affect the small and large bowel, with looseness of the bowels as the predominant symptom.

The term “gastroenteritis” classically denotes infection of the stomach and proximal little bowel. Organisms causing this disorder consist of Bacillus cereus, S aureus, and a quantity of viruses (rotavirus, norovirus). B cereus and S aureus produce a preformed neurotoxin that, even in the absence of viable bacteria, is capable of causing disease, and these toxins represent major leads to of foods poisoning.

Although the exact mechanisms are poorly understood, it’s thought that neurotoxins act locally, through stimulation of the sympathetic nervous system having a resultant improve in peristaltic activity, and centrally, through activation of emetic centers within the brain. The spectrum of diarrheal infections is typified by the diverse clinical manifestations and mechanisms via which E coli can trigger diarrhea.

Colonization from the human GI tract by E coli is universal, usually occurring within hours following birth. Nevertheless, when the host organism is exposed to pathogenic strains of E coli not normally present in the bowel flora, localized GI illness or even systemic sickness may occur.

You will find five major classes of diarrheogenic E coli: enterotoxigenic (ETEC), enteropathogenic (EPEC), enterohemorrhagic (EHEC), enteroaggregative (EAEC), and enteroinvasive (EIEC). Functions typical to all pathogenic E coli are evasion of host defenses, colonization of intestinal mucosa, and multiplication with host cell injury.

This organism, like all GI pathogens, should survive transit via the acidic gastric environment and be able to persist within the GI tract despite the mechanical force of peristalsis and competition for scarce nutrients from existing bacterial flora. Adherence can be nonspecific (at any part from the intestinal tract) or, a lot more commonly, particular, with attachment occurring at well-defined anatomic areas.

Once colonization and multiplication happen, the stage is set for host injury. Infectious diarrhea is clinically differentiated into secretory, inflammatory, and hemorrhagic kinds, with different pathophysiologic mechanisms accounting for these diverse presentations. Secretory (watery) diarrhea is caused by a quantity of bacteria (eg, Vibrio cholerae, ETEC, EAggEC), viruses (rotavirus, norovirus), and protozoa (Giardia, Cryptosporidium).

These organisms attach superficially to enterocytes in the lumen of the small bowel. Stool examination is notable for the absence of fecal leukocytes, even though in uncommon instances there’s occult blood in the stools. Some of these pathogens elaborate enterotoxins, proteins that improve intestinal cyclic adenosine monophosphate (cAMP) production, primary to net fluid secretion. The classic example is cholera.

The bacterium V cholerae creates cholera toxin, which leads to prolonged activation of epithelial adenylyl cyclase within the small bowel, primary to secretion of massive amounts of fluid and electrolytes into the intestinal lumen. Clinically, the patient presents with copious diarrhea (“rice-water stools”), progressing to dehydration and vascular collapse without having vigorous volume resuscitation.

ETEC, a common trigger of acute diarrheal sickness in young kids and the most typical trigger of looseness of the bowels in travelers returning to the United States from developing countries, creates two enterotoxins. The heat-labile toxin (LT) activates adenylyl cyclase in a manner analogous to cholera toxin, whereas the heat-stable toxin (ST) activates guanylyl cyclase activity.

Inflammatory diarrhea is really a result of bacterial invasion of the mucosal lumen, with resultant cell death. Patients with this syndrome are usually febrile, with complaints of crampy lower abdominal discomfort as nicely as diarrhea, which might contain visible mucous. The term dysentery is utilized when there are substantial numbers of fecal leukocytes and gross blood.

Pathogens connected with inflammatory looseness of the bowels consist of EIEC, Shigella, Salmonella, Campylobacter, and Entamoeba histolytica. Shigella, the prototypical trigger of bacillary dysentery, invades the enterocyte through formation of an endoplasmic vacuole, which is lysed intracellularly. Bacteria then proliferate within the cytoplasm and invade adjacent epithelial cells.

Production of a cytotoxin, the Shiga toxin, leads to local cell destruction and death. EIEC resembles Shigella both clinically and with respect towards the mechanism of invasion of the enterocyte wall; however, the specific cytotoxin associated with EIEC has not yet been identified. Hemorrhagic diarrhea, a variant of inflammatory diarrhea, is primarily triggered by EHEC.

Infection with E coli O157:H7 has been connected with a quantity of deaths from the hemolytic-uremic syndrome, with a number of well-publicized outbreaks related to contaminated foods. EHEC leads to a broad spectrum of clinical disease, with manifestations including (1) asymptomatic infection, (2) watery (nonbloody) looseness of the bowels, (three) hemorrhagic colitis (bloody, noninflammatory diarrhea), and (4) hemolytic-uremic syndrome (an acute illness, primarily of children, characterized by anemia and renal failure). EHEC doesn’t invade enterocytes; nevertheless, it does create two Shiga-like toxins (Stx1 and Stx2) that closely resemble the Shiga toxin in structure and function. After binding of EHEC towards the cell surface receptor, the A subunit of the Shiga toxin catalyzes the destructive cleavage of ribosomal RNA and halts protein synthesis, leading to cell death.

Clinical Manifestations: Clinical manifestations of GI infections vary depending on the on website of involvement For instance, in staphylococcal foods poisoning, symptoms develop several hours after ingestion of foods contaminated with neurotoxin-producing S aureus. The symptoms of staphylococcal food poisoning are profuse vomiting, nausea, and abdominal cramps.

Diarrhea is variably present with agents leading to gastroenteritis. Profuse watery (noninflammatory, nonbloody) diarrhea is connected with bacteria that have infected the small intestine and elaborated an enterotoxin (eg, Clostridium perfringens, V cholerae). In contrast, colitis-like symptoms (lower abdominal pain, tenesmus, fecal urgency) and an inflammatory or bloody diarrhea occur with bacteria that more generally infect the large intestine.

The incubation period is usually longer (> 3 days) for bacteria that localize towards the large intestine, and colonic mucosal invasion can occur, causing fever, bacteremia, and systemic symptoms.