Monday, April 20, 2009

EnviroScience

WILDLIFE AND THE ENVIRONMENT: THE CORE POLITICS OF NATURAL SCIENCE

 

The beginning of this century seems to have brought all science of the environment, from many years gone by up to the present, under a ‘X 10’ magnifying glass. This is a time when a loud call for a collective political action to the global community has been made with much emphasis. One would not wonder to hear that the recently ended Copenhagen conference for world scientists on ‘the environment’ has conclusively been termed as ‘the final warning’ to the global community on environmental management. I too believe this one should really be the last warning, not necessarily implying that that scientists have given up raising alarms on the damage of the environment, but that there will never again be another convenient time for another call to be made before it will be too late, for now it is very late.

 

It is very interesting to see how world politicians are fighting hard for the recovery of a clean environment. I recently realized that a clean environment means ‘a clean breath’ to all. But how does politics and the environment relate? A good number of legislative acts are in place already, to control hazardous activities and chemicals disposal .

 

There are a lot of micro activities that people in seemingly ‘innocent’ communities undertake for their daily livelihood that contribute to the damage of the environment. Unnecessary disposal of persistent organic materials among other things are the major contributors to the evil looking climate changes. A very simple activity of cutting down a branch of a tree has a big bearing on a lot to both animal and plant lives. Good to remember that ‘homo sapiens’ which is a scientific identity for man in the animal kingdom, includes the reader and I. Climate changes may sound like one of normal progression of evolving identities but they are very fatal to a proper conservation of species most of which are good for tourism, pharmaceutical production, and other important research activities.

The input of human kind to the damage of the environment is dynamic. It comes, as to my keen observation, in two folds. The first one is due to what man takes from the natural environment: as I have already briefly explained above, cutting down of trees from the environment affects the whole ecosystem of living things. Literally, meaning that some naturally tree dwelling animals will no longer have a place to stay, to reproduce and to survive, the consequence of which is abnormal behaviour (Deviant from what that particular species in meant to have). This in turn develops a completely different characterization of the animals and then affect animal research results ( may be positive to a very small extent, but to a sound scientist, negative to a large extent as this is destroying life, depending on a philosophical argument a scientist can give).

Animals behave differently about reproducing themselves. It is very obvious that some animals will find it hard to mate at inconvenient places. Having destroyed a natural habitat, most likely mating places for some animals as well, species will not be reproducing, hence the whole of some animal families will completely die away with no offspring left. The world, including man as a stakeholder will be the one on the loosing side.

‘Survival of the fittest’ as postulated by Charles Darwin implies that the fittest animals will survive over those which are less fit, but surely, they will survive only if they have a place to survive on. Animals will never be able to make it, even when they have defeated all other animals by what I can call ‘natural conquest’ but all of its favourable environmental conditions required are not present. That species will consequently die away.

In all the above scenarios, I have described the impact of environmental mismanagement from a very simple but common mal act of cutting down trees in the expense of animal life. Again, animal life includes both mine and yours.

 

When the same concept is carefully extrapolated to the plant kingdom, one would be able to appreciate how much his or her actions are contributing to this global climatic change.

A very good indicator to what climate changes has done to a probable inconvenience of the people of Malawi, central Africa is what has just been experienced at the end of 2008/2009 growing season. It has always been the case that rain stops between midi march to early march. This season, Malawi has experienced some prolonged rain which has to some extent led to maize becoming mouldy right in the fields, a poor pre-condition for storage. This kind of unusual phenomenon has been variably observable for some time now, all as a collective result of poor environmental management from household activities up to the factories.

On the same, I can include mining at the kayerekera (…the good is often entered with their bones…) and other mines in the world.

Bush fires, which are environmentally hazardous like those that frequent the zomba plateau, also play a big role in damaging the environment. Imagine how much of life, how much of valuable species, how much of the God given treasures we have destroyed!

The second fold is when people pump in wastes into the environment. Bush fires have brought more harm than the good if at all available in individual selfish acts. Industrialization is an evil that the Morden world can not manage to let go. The bad fumes are accumulating high up for our own doom.

I would recommend that each citizen of every nation be on guard for our environment. There are several legislative acts that if locally empowered, every one will be able to know that he or she is responsible for the environment they are living in.

I quote one of the points stated on the last day of the 3 days’ Copenhagen convention on the environment that “there is no excuse for inaction” towards the depletion of a life conducive environment and that we need to influence that interest for everyone to create a better world for us today and human offsprings to come.

 

If all African governments were able to include good environmental management in their political agenda and manifesto as part of ethics on energy sufficiency programmes, and most importantly, as an independent subject in the primary and secondary school curricula.

We need to take a powerful stand on this.

I hope Malawi will be both a reliable contributor and a beneficiary at the UN climate summit in December.

Let us love life!

 

 

Andrew

 

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More from Dr. Anne marie Helmenstine

Make Biodiesel - Instructions for Making Biodiesel from Vegetable Oil



Save Money Making Your Own Biodiesel
By Anne Marie Helmenstine, Ph.D., About.com

It's easy and cost-effective to make your own biodiesel.
Biodiesel Engine Biodiesel Plant How to Make Biodiesel Biodiesel Production Making Biodiesel

Biodiesel is a diesel fuel that is made by reacting vegetable oil (cooking oil) with other common chemicals. Biodiesel may be used in any diesel automotive engine in its pure form or blended with petroleum-based diesel. No modifications are required, and the result is a less-expensive, renewable, clean-burning fuel. Here's how to make biodiesel from fresh oil. You can also make biodiesel from waste cooking oil, but that is a little more involved, so let's start with the basics.

Materials for Making Biodiesel

· 1 liter of new vegetable oil (e.g, canola oil, corn oil, soybean oil)
· 3.5 grams (0.12 oz.) sodium hydroxide (also known as lye). Sodium hydroxide is used for some drain cleaners, such as Red Devil™ drain cleaner. The label should state that the product contains sodium hydroxide (not calcium hypochlorite, which is found in many other drain cleaners)

· 200 milliliters (6.8 fl. oz.) of methanol (methyl alcohol). Heet™ fuel treatment is methanol. Be sure the label says the product contains methanol (Isoheet™, for example, contains isopropyl alcohol and won't work).

· blender with a low speed option. The pitcher for the blender is to be used only for making biodiesel. You want to use one made from glass, not plastic, since the methanol you will use can react with plastic.

· digital scale [to accurately measure 3.5 grams (0.12 oz.)]

· glass container marked for 200 milliliters (6.8 fl. oz.). If you don't have a beaker, measure the volume using a measuring cup, pour it into a glass jar, then mark the fill-line on the outside of the jar.

· glass or plastic container that is marked for 1 liter (1.1 quart)

· wide mouth glass or plastic container that will hold at least 1.5 liters (2-quart pitcher works well)

· safety glasses, gloves, and probably an apron. You do not want to get sodium hydroxide or methanol on your skin, nor do you want to breathe the vapors from either chemical. Both chemicals are toxic. Please read the warning labels on the containers for these products! Methanol is readily absorbed through your skin, so do not get it on your hands. Sodium hydroxide is caustic and will give you a chemical burn. Prepare your biodiesel in a well-ventilated area. If you spill either chemical on your skin, rinse it off immediately with water.

Let's Make Biodiesel!

1. You want to prepare the biodiesel in a room-temperature (70° F) or warmer room since the chemical reaction will not proceed to completion if the temperature is too low.

2. If you haven't already, label all your containers as 'Toxic - Only Use for Making Biodiesel', since you don't want anyone drinking your supplies and you don't want to use the glassware for food again.

3. Pour 200 ml methanol (Heet) into the glass blender pitcher.

4. Turn the blender on its lowest setting and slowly add 3.5 g sodium hydroxide (lye). This reaction produces sodium methoxide, which must be used right away or else it loses its effectiveness. (Like sodium hydroxide, it can be stored away from air/moisture, but that might not be practical for a home setup.)

5. Mix the methanol and sodium hydroxide until the sodium hydroxide has completely dissolved (about 2 minutes), then add 1 liter of vegetable oil to this mixture.

6. Continue blending this mixture (on low speed) for 20-30 minutes.

7. Pour the mixture into a wide-mouth jar. You will see the liquid start to separate out into layers. The bottom layer will be glycerin. The top layer is the biodiesel.

8. Allow at least a couple of hours for the mixture to fully separate. You want to keep the top layer as your biodiesel fuel. If you like, you can keep the glycerin for other projects. You can either carefully pour off the biodiesel or use a pump or baster to pull the biodiesel off of the glycerin.

Using Biodiesel

Normally you can use pure biodiesel or a mixture of biodiesel and petroleum diesel as a fuel in any unmodified diesel engine. There are two situations in which you definitely should mix biodiesel with petroleum-based diesel.

· If you are going to be running the engine at a temperature lower than 55° F (13° C), you should mix biodiesel with petroleum diesel. A 50:50 mixture will work for cold weather. Pure biodiesel will thicken and cloud at 55° F, which could clog your fuel line and stop your engine. Pure petroleum diesel, in contrast, has a cloud point of -10° F (-24° C). The colder your conditions, the higher percentage of petroleum diesel you will want to use. Above 55° F you can use pure biodiesel without any problem. Both types of diesel return to normal as soon as the temperature warms above their cloud point.

· You will want to use a mixture of 20% biodiesel with 80% petroleum diesel (called B20) if your engine has natural rubber seals or hoses. Pure biodiesel can degrade natural rubber, though B20 tends not to cause problems. If you have an older engine (which is where natural rubber parts are found), you could replace the rubber with polymer parts and run pure biodiesel.

Biodiesel Stability & Shelf Life

You probably don't stop to think about it, but all fuels have a shelf life that depends on their chemical composition and storage conditions. The chemical stability of biodiesel depends on the oil from which it was derived. Biodiesel from oils that naturally contain the antioxidant tocopherol or vitamin E (e.g., rapeseed oil) remain usable longer than biodiesel from other types of vegetable oils. According to at least one source stability is noticeably diminished after 10 days and the fuel may be unusable after 2 months. Temperature also affects fuel stability in that excessive temperatures may denature the fuel.

What Is the Difference Between a Scientist and an Engineer?


By Anne Marie Helmenstine, Ph.D., About.com

Chemical engineers supervise the central pumping station at the Yukos Oil and Gas company in Nefteyugansk, Siberia.

Links

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Question: What Is the Difference Between a Scientist and an Engineer?

Scientist versus engineer... are they the same? Different? Here's a look at the definitions of scientist and engineer and the difference between a scientist and engineer.

Answer: A scientist is a person who has scientific training or who works in the sciences. An engineer is someone who is trained as an engineer. So, to my way of thinking, the practical difference lies in the educational degree and the description of the task being performed by the scientist or engineer. On a more philosophical level, scientists tend to explore the natural world and discover new knowledge about the universe and how it works.

Engineers apply that knowledge to solve practical problems, often with an eye toward optimizing cost, efficiency, or some other parameters.

There is considerable overlap between science and engineering, so you will find scientists who design and construct equipment and engineers who make important scientific discoveries. Information theory was founded by Claude Shannon, a theoretical engineer. Peter Debye won the Nobel Prize in Chemistry with a degree in electrical engineering and a doctorate in physics.

Do you feel there are important distinctions between scientists and engineers? You're invited to define the difference.

Why is Stainless Steel Stainless?


What It Is and How It Works!

By Anne Marie Helmenstine, Ph.D., About.com

What Is Stainless Steel and Why Is it Stainless?

In 1913, English metallurgist Harry Brearly, working on a project to improve rifle barrels, accidentally discovered that adding chromium to low carbon steel gives it stain resistance.

In addition to iron, carbon, and chromium, modern stainless steel may also contain other elements, such as nickel, niobium, molybdenum, and titanium. Nickel, molybdenum, niobium, and chromium enhance the corrosion resistance of stainless steel. It is the addition of a minimum of 12% chromium to the steel that makes it resist rust, or stain 'less' than other types of steel.

The chromium in the steel combines with oxygen in the atmosphere to form a thin, invisible layer of chrome-containing oxide, called the passive film. The sizes of chromium atoms and their oxides are similar, so they pack neatly together on the surface of the metal, forming a stable layer only a few atoms thick. If the metal is cut or scratched and the passive film is disrupted, more oxide will quickly form and recover the exposed surface, protecting it from oxidative corrosion. (Iron, on the other hand, rusts quickly because atomic iron is much smaller than its oxide, so the oxide forms a loose rather than tightly-packed layer and flakes away.)

The passive film requires oxygen to self-repair, so stainless steels have poor corrosion resistance in low-oxygen and poor circulation environments. In seawater, chlorides from the salt will attack and destroy the passive film more quickly than it can be repaired in a low oxygen environment.

Types of Stainless Steel

The three main types of stainless steels are austenitic, ferritic, and martensitic. These three types of steels are identified by their microstructure or predominant crystal phase.

Austenitic: Austenitic steels have austenite as their primary phase (face centered cubic crystal). These are alloys containing chromium and nickel (sometimes manganese and nitrogen), structured around the Type 302 composition of iron, 18% chromium, and 8% nickel. Austenitic steels are not hardenable by heat treatment.

The most familiar stainless steel is probably Type 304, sometimes called T304 or simply 304. Type 304 surgical stainless steel is an austenitic steel containing 18-20% chromium and 8-10% nickel.

Ferritic: Ferritic steels have ferrite (body centered cubic crystal) as their main phase. These steels contain iron and chromium, based on the Type 430 composition of 17% chromium. Ferritic steel is less ductile than austenitic steel and is not hardenable by heat treatment.

Martensitic: The characteristic orthorhombic martensite microstructure was first observed by German microscopist Adolf Martens around 1890. Martensitic steels are low carbon steels built around the Type 410 composition of iron, 12% chromium, and 0.12% carbon. They may be tempered and hardened. Martensite gives steel great hardness, but it also reduces its toughness and makes it brittle, so few steels are fully hardened.

There are also other grades of stainless steels, such as precipitation-hardened, duplex, and cast stainless steels. Stainless steel can be produced in a variety of finishes and textures and can be tinted over a broad spectrum of colors.

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