Evolution Questions Assignment Example | Topics and Well Written Essays - 2500 words

Development Questions - Assignment Example At the point when meiosis happens, qualities are isolated aimlessly and occasions, for example, traverse can happen, which causes expanded hereditary variety. In bigger populaces, the allelic blends regularly remain stable after some time. Be that as it may, in littler populaces, any sort of variety or creation of one quality over another because of chance can have an enormous change in the genetic stock frequencies. The most valuable approach to consider this idea is as far as the Hardy Weinberg Equation, which is a quadratic recipe that computes the hereditary frequencies of the homozygous predominant, homozygous latent, and heterozygous articulations. The Hardy Weinberg Equation utilizes the letters P and Q so as to addresses the alleles for a populace with homozygous prevailing being p2, homozygous passive being q2, and heterozygous being pq. Ordinarily, in a standard populace and measurably substantial populace, the proportions would be the equivalent. Like expressed above there are different variables, which would then be able to influence the proportion of these allelic frequencies. A portion of the living beings may get by because of matchless quality of the attributes they communicated or the irregularity of gamete development may prompt an unproportional articulation in characteristics. For instance, lets consider a populace which has allelic frequencies of p=0.3 and q=0.7. ... This is on the grounds that a measurable change in allelic frequencies in a littler populace because of chance has a bigger and progressively critical impact in light of the fact that the populace, N, is littler. In this manner, the impact size is bigger. The explanation that it isn't as amazing in populaces with an enormous N esteem is on the grounds that it is imagined that the possibility of one allelic mix being delivered over the other is insignificant, in this manner they offset which shows that there is no genuine coming about possibility in the frequencies of the genetic supply. DNA replication is a procedure, which is progressing at each second in each life form. It is significant so as to guarantee that the structure of the hereditary code stays suitable for multiplication, anyway the code turns out to be progressively disturbed each time that it is recreated. These slip-ups are transformations, which happen in the replication of DNA can make either attractive or unwanted q ualities structure. This is one of the premise in which development is thought to happen. Various sorts of changes effectsly affect development. Substitution transformations are a lot of lower than replacement changes. These are thought to impact impartial qualities, which remain basically comparative after some time. Replacement transformations are thought to occur in qualities that are dynamic and are snappy changing in this is the primary change, which advances the most hereditary variety. Preservation science is the field of science that is coordinated explicitly at understanding and ensuring the biodiversity of the Earth. Understanding the job and relationship of species in their living spaces and environments does this. In particular, Templeton was worried about the human action, which was having an effect on hereditary variety of the nabbed reptiles in the

A Shining Thread of Hope - The History of Black Women in America Essay

A Shining Thread of Hope - The History of Black Women in America - Essay Example It is through this quality and the subsequent obligations of family, network and confidence, the creators contend, that both yesterday’s and today’s African American lady is starting to be perceived for her huge commitments to the advancement and improvement of the United States and the significance she keeps on playing in giving guides to live, work and raise a family in attempting times with pride, elegance, love and achievement. The introduction of the book promptly catches the reader’s consideration with a point by point portrayal of a youthful African woman’s life in the soonest days of the states. This example is proceeded with further detail into this and different accounts of African ladies in the early states as the book moves into its first part. The feeling of promptness is created as the creators fictionalize to a degree in depicting Lucy Terry Prince and other early African ladies brought to America. â€Å"A young lady remained on the shores of the New World. †¦ We don't have the foggiest idea about this woman’s name, however we will call her Oni. She will be, for us, not a number †one of twenty slaves who were the first to be brought to North America †however the genuine lady she was† (8). In spite of the fact that they showed up on these shores as slaves, the creators exhibit how these early slaves picked up opportunity, bliss, land proprietorship, grant and, now and again, a level of uniformity with their white neighbors. However there stay huge holes to these accounts as the youngsters vanish or the family property is gobbled up by white intruders. â€Å"It is critical to recall that other African Americans, ladies just as men, were at the same time making a different culture. Its improvement was not typically recorded, and not many names have come down to us† (26). As they depict these accounts, the creators likewise work to separate themselves from the tales, frequently exchanging back to the story educational voice of the present rather

Business Decision Assignment Problem Statement, Decision - 275 Words

Business Decision Assignment: Problem Statement, Decision (Essay Sample) Content: Business decisionInstructors NameInstitutionStudents NameCourse NameCurrent situationThe current situation at the Apple Company is the lack of the application processors that the products of the Company need to use. The company is buying the application processor from its main competitor Samsung. Samsung Company being the main supplier of the application processor into the Apple Inc. The company, the Samsung Company, is also playing the sabotage role. It is selling the application processors to the Apple Inc. The company at a very high price. The high prices of the app processors are making the production cost of the Apple Inc. Products to go up hence high prices. The current situation that, the Company does not realize the higher profit margins that it was sometimes enjoying back. The major supplier of the application processor for the Samsung Company is now becoming the major threat on the smartphones. Apple receives more that 50% of its revenues from selling of the iPhones. The corporate margins are a bit lower than the iPhone margins. However, Samsung Company in the recent future has been able to overtake the Apple Inc. Company and it is now leading to the selling of the smartphones.Problem statementApple Company is currently experiencing a lot of decline in the total revenue and the loss of the market share to its major competitor Samsung Company. The Company used to be the largest market share holder in the iPhones but currently Samsung has already overtaken the Company. Apple is also paying a whopping $10 billion to its main competitor every year for the application processors. The problem is affecting the management of the Apple Inc Company, and they need to resolve the problem as quick as possible to ensure that everything is going according to plan.Decision statementThe Company is now in the process of trying to change the supplier of application processors so that they can be able to realize high returns. The Company is also thinking of making its application processor able to avoid the relationship with Samsung Company.Research objectivesTo produce the best application processors that will help in improving the functioning of the Samsung products.To cut the cost of production by 50% by avoidi...

Latin America Essay - 2834 Words

Hisotry of Latin America History of the region from the pre-Columbian period and including colonization by the Spanish and Portuguese beginning in the 15th century, the 19th-century wars of independence, and developments to the end of World War II.Latin America is generally understood to consist of the entire continent of South America in addition to Mexico, Central America, and the islands of the Caribbean whose inhabitants speak a Romance language. The peoples of this large area shared the experience of conquest and colonization by the Spaniards and Portuguese from the late 15th through the 18th centuries as well as movements of independence from Spain and Portugal in the early 19th century. Even since independence, many of the various†¦show more content†¦However, those profits merely whetted those Creoles appetites for greater free trade than the Bourbons were willing to grant. More generally, Creoles reacted angrily against the crowns preference for peninsulars in administrative positions and i ts declining support of the caste system. After hundreds of years of proven service to Spain, the American-born elites felt that the Bourbons were now treating them like a recently conquered nation. In cities throughout the region, Creole frustrations increasingly found expression in ideas derived from the Enlightenment. Imperial prohibitions proved unable to stop the flow of potentially subversive English, French, and North American works into the colonies of Latin America. Creole participants in conspiracies against Portugal and Spain at the end of the 18th and beginning of the 19th centuries showed familiarity with such European Enlightenment thinkers as Thomas Hobbes, John Locke, Montesquieu, and Jean-Jacques Rousseau. The Enlightenment clearly informed the aims of dissident Creoles and inspired some of the later, great leaders of the independence movements across Latin America. Still, these ideas were not, strictly speaking, causes of independence. Creoles selectively adapted rather than simply embraced the thought that had informedShow MoreRelatedThe Culture Of Latin America Essay1630 Words   |  7 Pagesculture of Latin America is multi-faceted and rich. More than 300 million Spanish speakers reside in Latin America and are spread across a vast geographic region; this makes it tough at times to explain Latin American culture. Though, there are some living standards and ways of observing life which is in common all over the majority of the area. Latin America comprises of 21 main countries. Major languages spoken in Latin America are French, Portuguese, and Spanish. The Latin America region is aRead MoreThe Impact Of Latin American Culture On Latin America1656 Words   |  7 Pagesactive war zone, living in Latin America would be much like that. The war being fought here is very different, instead of fighting another country, they are fighting drugs. Al though war is generally a negative thing, this one is not. In this war there are negatives, but the positives far outweigh them. Latin American countries have witnessed the very noticeable benefits of the drug trade in many aspects of everyday life. The use and production of drugs is important to Latin American culture, bringsRead MoreEssay on Women in Latin America1114 Words   |  5 Pages Women in Latin America were expected to adhere to extreme cultural and social traditions and there were few women who managed to escape the burden of upholding these ridiculous duties, as clearly shown in â€Å"Chronicle of a Death Foretold†. 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Three countries where revolts were successfully established were Haiti, Venezuela, and Brazil. The countries in Latin America benefited from the revolts becau se they became free from colonial rule, butRead MoreThe Spanish Colonization Of Latin America Essay1270 Words   |  6 PagesBecause the Indians and Spanish lived in different areas in Latin America, the Indian culture and society did not change significantly. Or did there society change? The Spanish colonizers had a huge influence on the indigenous peoples of Mexico and Peru’s, culture, language, traditions, religion, even on their native food. One can say that this came into being shortly after Columbus discovered the New World. The Spanish conquistadors, who sailed with Columbus to the New World, were the first toRead MoreThe Economic Situation Of Latin America2506 Words   |  11 PagesLatin America is filled with countries that have such great richness in environmental, agricultural and cultural goods but unfortunately it is also the place where the majority of the countries have high levels of poverty and social inequalities. Latin America is the place where we find many natural wonders like the Amazon rainforest, the Andes, the Iguazu Falls and many other natural resources. However, the economic situation is one of the poorest in the world. According to the article, The PoliticsRead MoreThe Political Landscape Of Latin America Essay1471 Words   |   6 PagesGovernance in Latin America is punctuated with frequent periods of revolt and reform. The relationship between leaders and followers in Latin America is varied because the political landscape of Latin America is so diverse. This essay will focus on the relationship of leaders and followers in the caudillo leaderships of Juan Perà ³n, Simon Bolà ­var, and Aparicio Saravia. Juan Perà ³n was born in 1895 in Buenos Aires. He began military school as a young man and progressed through the officer ranks. HeRead MoreThe Spanish Colonization Of Latin America1270 Words   |  6 PagesBecause the Indians and Spanish lived in different areas in Latin America, the Indian culture and society did not change significantly. Or did there society change? The Spanish colonizers had a huge influence on the indigenous peoples of Mexico and Peru’s, culture, language, traditions, religion, even on their native food. One can say that this came into being shortly after Columbus discovered the New World. The Spanish conquistadors, who sailed with Columbus to the New World, were the first to

Ethics of Emergencies - 987 Words

Ethics of Emergencies â€Å"The Ethics of Emergencies† explains Ayn Rand’s radical and unique view of altruism. She believes that there are 4 consequences of altruism, all of which are negative. These, simply put, are lack of self-esteem, lack of respect for others, a pessimistic view of life, and an indifference to ethics. She says that altruism hinders acts of true benevolence, and instead people act out of an obligation to others that has been internalized over time. Rand then argues that one should only volunteer to help strangers in emergency situations, and even then, only when the risk to one’s own life is less than the risk to the stranger’s. Rand advocates action in such emergencies because of the high value of human life. But Rand†¦show more content†¦While I disagree with Rand’s ethics, I think she made an excellent observation concerning human motives in making a â€Å"sacrifice.† The best example is her analysis of why a husband would risk his life to save his wife. Rand says that the true reason the man risks his life for a loved one is because life without that loved one would be too difficult. I agree with her, but in reality, it is a much more emotional and a less cognitive response. The decision to aid the loved one is not made in the way that most rational decisions are constructed. I believe the decision is made in the following way. An individual experiences enjoyable feelings while considering or imagining saving a loved one. While this feeling may fundamentally happen because saving the loved one makes the individual happier than letting the loved one die, I believe the individual does not experience it in this manner. The individual believe the good feeling they experience is their moral conscience. This is a defense mechanism the mind uses to hide the true motive of the behavior and keep the individual ignorant of the selfish reason for â€Å"sacrificing† themselves. While I fo und myself experiencing feelings of frustration and disgust while reading Rand’s essay, I afterwards decided that it was time well spent. While it did not express views that I share, it wasShow MoreRelatedEmt Code Of Ethics Adopted By The National Association Of Emergency Medical Technicians1611 Words   |  7 PagesIn accordance with the EMT Code of Ethics adopted by the National Association of Emergency Medical Technicians, EMTs pledge â€Å"to conserve life, alleviate suffering, promote health, do no harm, and encourage the quality and equal availability of emergency medical care†. Through the medical education for an EMT license, a student learns how to appropriately treat and care for a medical or traumatic emergency in order to be able to successfully follow this system. Students are also taught the conceptsRead MoreEmergency Medicine and the Ethical Dilemmas1749 Words   |  7 PagesEmergency Medicine and the Ethical Dilemmas Luisa Martin HCA 322 Instructor Thomas December 5, 2010 Picture this scenario: You are working  in the emergency room of a public hospital where the  Ã‚   inflow of patients is higher than the available beds. You are treating an elderly man who is breathless and cyanosed. While you assess whether he has chronic obstructive pulmonary disease or heart failure, he becomes drowsy and starts gasping. You quickly intubate him with some difficulty, prolongingRead MoreEssay on Rands Ideas621 Words   |  3 PagesActivity 3.4 - Essay on Rands Ideas Using The Ethics of Emergencies by Ayn Rand (pp. 215-218), develop an essay between 2 to 3 pages discussing her ideas in todays moral environment. Provide one other reference in addition to our text. The Ethics of Emergencies describes how some people base their ethical principles on emergency situations. The classic example is the lifeboat scenario. The scenario is that what if you are stuck on a lifeboat with some other people, and theres not enough waterRead MoreEthics in Medicine : the Relationship Between Law and Medical Ethics:1271 Words   |  6 PagesThe essay will discuss the ETHICS IN MEDICINE : The Relationship Between Law and Medical Ethics: Dispute and Legal Issues: A 32 year old woman was admitted to the Trauma Intensive Care Unit following a motor vehicle accident; she had multiple injuries and fractures, with several complications which continued to develop over the first couple of weeks. The patient rapidly developed Adult Respiratory Distress Syndrome, was on a ventilator, and was continuously sedated. Shortly after the patientsRead MoreA Long-Standing Issue Within The Community Of Nursing Is1528 Words   |  7 Pagespresent multiple times to the emergency department. 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The altruistic mentality of an individualRead MoreThe Ethics And Social Welfare1568 Words   |  7 Pagesa critique of an article selected from the eJournal Ethics and Social Welfare. It focuses on a dilemma encountered in a practice situation involving an inexperienced practitioner (a youth worker) met by two young women. Both women were 14 years of age, one of whom (Danielle) required emergency contraception within the next two hours. The only place available at the hours this dilemm a presented itself to Aylssa was the local accident and emergency department, however, both women had no funds and soughtRead MoreThe Ethics Of A Systematic Disaster Plan1432 Words   |  6 Pagesplanning after the incident took place. The planning process for managing an emergency has to take into considerations certain factors such as the level of the devastation, what resources are needed, and how to eliminate the likelihood of the same incident from occurring again. 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Introduction In the event of any disaster or crisis, it is critical that public health officials, government leaders, and emergency responders develop a plan that minimizes the death toll and is ethical. The public health code of ethics and a systematic framework has been developed to guide the plans and actions of public health professionals. The public health code of ethics depends on the interdependence

Legalize it Persuasive Essay Example For Students

Legalize it Persuasive Essay No man should have control about something he or she did not create, but that God created. We have minds, and we will choose for ourselves, whether or not we like it. Marijuana has an excellent medical forte. Marijuana also has a very strong historical significance in the United States. It is now used and has been used for centuries for relieving and helping to cure illnesses. There are also many economical benefits for legalizing marijuana. Thus, marijuana has historical significance, medical uses, and economic benefits. Cultivation of marijuana in the United States dates back some four hundred years. Colonialist planted the first American marijuana crop in 1611 near Jamestown. They grew marijuana for its fiber content. King James I ordered the first ordered the cultivation of hemp in the colonies. A majority of colonial sails, bibles, clothing, and maps were made from hemp. Some historians believe George Washington and Thomas Jefferson grew marijuana and promoted a hemp-base society. Marijuana was first considered a mind-altering substance in the 1920s and 30s. During this time the drug was associated with mexican-american immigrants and African American jazz culture. This changed marijuanas image of being an excellent cash crop to being evil. With these accusations and false propaganda about marijuana leading to crime and being deadly, it was made illegal in 1937. The Marijuana Tax Act of 1937 made it illegal after only two one-hour congress meetings. Most of the information presented in these cong ress meetings has been proven false today by our medical society. Today marijuana remains the third most popular recreational drug in the United States. Even though it has been illegal for sixty years. Government figures say 70 million Americans have smoked marijuana. The majority of these people are hard working law-abiding citizens that should not be treated like criminals. Today state police arrest a marijuana smoker every fifty-four seconds. There are harsh penalties inflicted on marijuana smokers, which include incarceration, loss of license even when not driving, loss of child custody, and loss of public housing. As long as marijuana remains illegal, the United States looses money and effort trying to stop the use of plant that grows from the ground. Marijuana has the capability of being manufactured into twenty-five thousand environmentally safe products. This money making potential is being held from American farmers today. Industrial hemp is known as one of natures strongest and most versatile crops. The plant can be used in making various textiles, paper products, paints, clothing, plastics, cosmetics, foodstuffs, insulation, and animal feed. France harvests around ten thousand tons of industrial hemp every year. Currently hemp is grown legally in almost every country in the world except America. Hemp produces a much higher yield per acre than common substitutes. Domestic sales of imported hemp are around 35 million dollars per year. The American Farm Bureau states, Hemp is one of the most promising crops in half a century. American industries such as Adidas, Calvin Klein, and Ralph Lauren added imported hemp to their clothing lines. They have found it to be highly profitable. All of these economical benefits hemp has to offe r and its still considered illegal in the United States. Marijuana makes a large amount of money for our economy legally and illegally. If it were legalized it could make more. Making marijuana illegal looses money for Americas government. The government spends twenty-three thousand dollars a year incarcerating nonviolent marijuana offenders. The prohibition of marijuana looses this countries taxpayers 7.5 billion dollars a year. This large amount of funding should be put forth to target violent ones. Legalizing marijuana will help the issue of scarce jail space in this country and it will help stop clogging our countrys courts. .ud0d9602cd08fb647f6df10715ef6f055 , .ud0d9602cd08fb647f6df10715ef6f055 .postImageUrl , .ud0d9602cd08fb647f6df10715ef6f055 .centered-text-area { min-height: 80px; position: relative; } .ud0d9602cd08fb647f6df10715ef6f055 , .ud0d9602cd08fb647f6df10715ef6f055:hover , .ud0d9602cd08fb647f6df10715ef6f055:visited , .ud0d9602cd08fb647f6df10715ef6f055:active { border:0!important; } .ud0d9602cd08fb647f6df10715ef6f055 .clearfix:after { content: ""; display: table; clear: both; } .ud0d9602cd08fb647f6df10715ef6f055 { display: block; transition: background-color 250ms; webkit-transition: background-color 250ms; width: 100%; opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; background-color: #95A5A6; } .ud0d9602cd08fb647f6df10715ef6f055:active , .ud0d9602cd08fb647f6df10715ef6f055:hover { opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; background-color: #2C3E50; } .ud0d9602cd08fb647f6df10715ef6f055 .centered-text-area { width: 100%; position: relative ; } .ud0d9602cd08fb647f6df10715ef6f055 .ctaText { border-bottom: 0 solid #fff; color: #2980B9; font-size: 16px; font-weight: bold; margin: 0; padding: 0; text-decoration: underline; } .ud0d9602cd08fb647f6df10715ef6f055 .postTitle { color: #FFFFFF; font-size: 16px; font-weight: 600; margin: 0; padding: 0; width: 100%; } .ud0d9602cd08fb647f6df10715ef6f055 .ctaButton { background-color: #7F8C8D!important; color: #2980B9; border: none; border-radius: 3px; box-shadow: none; font-size: 14px; font-weight: bold; line-height: 26px; moz-border-radius: 3px; text-align: center; text-decoration: none; text-shadow: none; width: 80px; min-height: 80px; background: url(https://artscolumbia.org/wp-content/plugins/intelly-related-posts/assets/images/simple-arrow.png)no-repeat; position: absolute; right: 0; top: 0; } .ud0d9602cd08fb647f6df10715ef6f055:hover .ctaButton { background-color: #34495E!important; } .ud0d9602cd08fb647f6df10715ef6f055 .centered-text { display: table; height: 80px; padding-left : 18px; top: 0; } .ud0d9602cd08fb647f6df10715ef6f055 .ud0d9602cd08fb647f6df10715ef6f055-content { display: table-cell; margin: 0; padding: 0; padding-right: 108px; position: relative; vertical-align: middle; width: 100%; } .ud0d9602cd08fb647f6df10715ef6f055:after { content: ""; display: block; clear: both; } READ: The Brethren EssayOn top of all these economical benefits of marijuana there are large medical benefits of marijuana. In the 1980s six different states sponsored studies all found that marijuana was an effective anti-emetic and an anti-nauseate for cancer chemotherapy. There were over one thousand patients in these studies. Co-principle investigator for the latest NAS report in 1997 said, short term marijuana use appears to be suitable in treating conditions like chemotherapy-induced nausea. Marijuana is proven to alleviate nausea, vomiting, and loss of appetite experienced by many AIDS patients. The

Solar Energy Outline Essays - Renewable Energy, Energy Conversion

Solar Energy Outline Thesis: Ever since the dawn of time, the sun has been a resource we cannot live or do without, so its not such a shock that man has come up with the idea of solar energy. Solar energy had many uses. Some can be dangerous and some, a very valuable asset to the modern world. I. What is solar energy? A. Who was the first person to use solar energy? B. When was it used? C. Where was solar energy first put to use? II. What are some of the uses of solar energy? A. Solar roof 1. Who invented it? 2. When was it invented? 3. What was it used for? 4. How does it work? B. Solar cooker 1. Who invented the first one? 2. When was it invented? 3. How does it work? 4. What is it used for? C. Solar oven 1. Who developed it? 2. When was it developed? 3. What does it look like? 4. How does it work? III. What are some of the dangers of solar energy(used today or otherwise) A. Laser 1. What is it? 2. How does laser work? B. Ultra-Violet Rays (UV rays) 1. Who discovered UV rays? 2. When was it discovered? 3. In what way is it dangerous? 4. How can we protect ourselves from this? IV. Conclusion A. What are some uses of solar energy around our household? 1. List some examples C. Thoughts on Solar energy 1. What we think of solar energy 2. Poll results A Primitive Resource: Solar Energy and Its Many Uses Ever since the dawn of time, the sun has been a resource we cannot live or do without, so its not such a shock that man has come up with the idea of solar energy. Solar energy had many uses. Some can be dangerous and some, a very valuable asset to the modern world. Solar energy is energy derived from the sun in a form of ultra-violet rays. Its was first applied to use in 212 B.C., by the Greek genius Archimedes. Solar energy was used to defend the habor of Syracuse against the Roman fleet. Archimedes used a mirror or "burning mirror" as they had called it, to set fire to the ships of the Roman fleets while standing on shore (McDaniels 83). It wasn't until 1615 when Salomon de Caux constructed the first solar device; a solar engine. His device was made of glass lenses, supporting frame, and an airtight metal vessel containing water and air. This produced a small water fountain when the air heated up during operation. This was considered to be more of a toy than a device, but it was the first published account of the use of solar energy since the fall of the Roman Empire (Cheremisinoff 1). Some other use of solar energy after that was the solar roof and the solar oven. The solar roof was thought up by Harold Hay. In a solar roof system, water is contained in a clear plastic bag and it is placed on a black metal roof. Hay got the idea while traveling in India on a technical aid mission for the U.S government. While there, he noticed that many people were living in rusty, sheet metal shacks, which were hot in the day and cold at night. Hay's plan was to remove the insulation from the roof on winter days so that the roof would get hot, and Replacing the insulation at night to allow the shack to be warm through the night. Then in the summer, he would so the reverse of what he did in winter to let the house cool at night and replacing the insulation in the daytime to block out the heat. Then over the years, Hay and a man named John Yellott constructed a 3- by 3.7-m building using water basins as the actual roofing material. During the summer, a slab of foam insulation was rolled back at night, and the water would become cold through the night sky evaporation. Since the water supply sat directly on a metal ceiling, it absorbed the heat from the room and kept the building air-conditioned all day. During the winter, the movable insulation was rolled back in the daytime which allowed for it to collect heat. This generated enough heat into the house through the ceiling at night to keep the room comfortable (McDaniels 179-181). Then there was the solar cooker. Developed by Augustin Mouchot in France and by John Ericsson in the United States in the nineteenth century. They wanted to develop a solar cooker that not only reached high temperatures, but also was to be used as a means of heat storage