Abstract

Abstract:
The aim of this paper is that the exact solutions of Non-Newtonian fluid namely micropolar fluid with MHD in porous medium by traveling wave solution. The governing equations PEDs for incompressible micropolar fluid with MHD in porous medium are reduced to ODEs through wave parameter. Finally we represent the result in 2D or 3D graphs.
Introduction:
In the present, every researcher is working on the non-Newtonian fluid from the both essential and sensible point of view. These fluids are immediate effects on the processing of polymer, animal blood, liquid crystal, geological flows in the earth mantle. Non-Newtonian fluids were defined by ISSA.
The general equations of Non-Newtonian fluid are highly non-linear and higher- order than the Navier-stokes equations. Therefore many analytical and numerical solutions are accessible of Non-Newtonian fluid on the topic.

Micropolar fluid model is description of Non-Newtonian fluid which is depended upon a microstructure and belongs to non-symmetrical stress tensor. Micropolar fluid theory was introduced by Eriggen.
Physically, Micropolar fluid may be rigid particles, at random oriented (spherical) elements suspended in a viscous medium where the change of fluid elements is disregarded. Micropolar fluid can perform a better model for animal blood.

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ABSTRACT: Existentialism lays stress on the existence of humans; Sartre believed that human existence is the result of chance or accident. There is no meaning or purpose of our lives other than what our freedom creates, therefore, we must rely on our own resources. Sartre thought that existence manifests itself in the choice of actions, anxiety and freedom of the will. In this way the responsibility of building one’s future is in one’s hands, but the future is uncertain and so one has no escape from anxiety and despair. We are always under the shadow of anxiety; higher responsibility leads to higher anxiety. The pursuit of being leads to an awareness of nothingness, nothingness to an awareness of freedom, freedom to bad faith and bad faith to the being of consciousness which provides the condition for its own possibility. Concluding his thought, Sartre says that existentialism is not pessimism. He says that existentialism does not aim at plunging us into despair: its final goal is to prepare us through anguish, abandonment and despair for a genuine life, and it is basically concerned with the human condition as a complete form of choice. The fundamental issue, therefore, is an authentic meaning of life.

Existentialism is a contemporary trend in the sphere of Philosophy. It lays stress on the existence of man. Existentialism was a protest against the traditional notions of man. It purports to form a ‘just’ concept of man, rejecting underestimation or overestimation of Man’s personality. The Chief tenate of existentialism is “Existence precedes essence”. It thinks that the existence of the individual is the highest truth. To it existence is more important than essence, for in essence; we are not able to find out the individuality. A particular man who is a moral entity, who fights against life, he should be the center of life, not his essence. Sartre says “Man exists, turns up, appears on the scene, and only afterwards, defines himself”. “In other wards, man first exists then he looks at the world, thinks” of it and acts in it as an individual.” His contemplation and his actions are possible only because his existence: Existence, thus is the first principle from which all else flows. It is only later, by living , thinking and acting that man defines his nature and forms what is called his essence-that which he is and will be .” (2) Consequently, man is like a blank sheet. He never comes in the world as finished product, as readymade, as well defined, rather he defines himself in course of his life. Sartre believe that human existence is the result of chance or accident. There is no meaning or purpose of his life other than what his freedom creates , therefore, he must rely on his own resources.

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In the Philosophy of Sartre, there is an accord between the feeling of anxiety and freedom. He thinks that existence manifest’s itself in the choice of actions, anxiety and freedom of will. He does not accept any kind of determination. Our past does not determine the present and we build up our own future. Our existence is absolutely free and fit consists in developing our life in full freedom. Existence means separating myself from the world and understanding myself as such i.e. I have to realize that I am not the same with the objects of the world and through my freedom I determine my future . In this way the responsibility of building my future is in my hands, but the future is uncertain and so I have no escape from anxiety and despair. Sartre is of opinion that many paths are open before us and among them we choose one. But as we are not able to choose the other opportunities, we are always under the shadow of anxiety. Higher the man’s responsibility leads to higher anxiety. It is deeply related to our existence.

Man is characterized by freedom. This free individual is also a creative individual i.e. we create our own personality, situation by interpreting our environment and in this way we are also responsible. Existence involves freedom – creativity – responsibility. Man is always responsible for his choice. He blames himself and not the society for the consequence of his choice . Man through his free acts determines his own destination. Man in making his personality, is never complete through out his life, he develops by his own free choice. In this sense, Heidegger has said that, “Dasein, it always its own possibility,” (3) and Sartre said that “it is true that the possible is- so to speak – an option on being and if it is true that the possible can come in the world only through a being which is its own possibility, this implies for human reality the necessity of being its being in the form of an option on its being.” (4)

Sartre has written a number of existentialist novels, dramas, stories, philosophical articles and books. Here we choose his great philosophical work “Being and Nothingness” and his famous novel ‘Nausea’ for the better understanding of his existentialist philosophy and the existential perception of the Human condition. In “Being and Nothingness”, Sartre has explained the most significant aspect of human reality, i.e. consciousness as Nothingness. This concept of Nothingness is central to the philosophy of Sartre because it holds the key to the solution of the problem of the relation between the Being -for-itself and the Being-in-self . The chief characteristics of Being-for-itself is Nothingness. Thus Sartre calls the human being Being-for-itself which may mean that for man, his being is to be realized . He calls material object Being-in-itself. It is through man that Nothingness comes into the world. The question then arises: What is it about the Being of man that occasion Nothingness? The answer is: freedom. Freedom is the nature of man. There is no difference between the Being- of man and his Being-free. This consciousness of freedom is disclosed in anxiety. There is thus an internal connection among nothingness, freedom and anxiety. These are inter related structural determinants of being of man.

Nothingness, freedom and anxiety provide the condition which make possible the movement of “bad faith”. Bad faith is a form of self-deception which in making use of freedom denies it. Bad faith is again to lying, yet not identical with it. In lying one hides the truth from others. In bad faith one hides the truth from oneself. In the former there is a quality of deceiver and deceived: in the later there is a unity of single consciousness. Bad faith does not come from outside. Consciousness affects itself with it. In describing the pattern of bad faith Sartre develops the example of a woman who consents to go out with a man who loves her. She is fully aware of his intention and knows that sooner or later she will have to make a decision. An immediate decision is demanded when he caresses her hands. If she leaves her hand then she encourages his advances: if she withdraw it, she may preclude any future relationship with the man. She may decides, but she seeks means for postponing the decision. It is at this point that “Bad faith” comes into play. She leaves her hand in his, but does not notice that she is doing so. She becomes all intellect, divorces her soul from her body and transforms her body into an object or thing – into the mode of “Being-in-itself”. Her hands becomes “a thing”, neither consenting nor resisting. She objectivizes her body and ultimately herself, as in-self , and thus stages a flight or an escape from herself as for-itself. She looses her subjectivity, her freedom and her responsibility for decision. She exists in bad faith.

The pursuit of being leads to an awareness of nothingness, Nothingness to an awareness of freedom, freedom to bad faith and bad faith to being-of consciousness which provides condition for its possibility.

By illustration of ‘bad faith’ Sartre concludes that nothingness is the essential part of consciousness, since bad-faith would not be possible without it. Sartre says that bad faith is a risk built into the nature of consciousness. The act of bad-faith proves that we aim to evade our responsibility, but according to Sartre we are compelled to be responsible. For Sartre, thus absolute freedom means, absolute responsibility.

In his novel ‘Nausea’ Sartre contents that man as existent is a mystery, a paradox and his nature and purposes cannot be summed up neatly in any formula. Man does not live as pure existence, but he may become aware of himself as such in the experience of Nausea. Roquentin, discovers in Nausea: “the essential is contingency. I mean that, by definition, existence cannot be identified with necessity. To exist is to happen without reason…. Every thing is purposeless. This garden, this town and myself.” (5) Here Roquentin is immobilized by the feeling that his own life together with all the world, is meaningless.

In ‘Nausea’ the hero comes to the conclusion that human life is a perpetual striving. Tried of taxing and ceaseless efforts, the worldly people falter in their struggle to achieve lucidity and make decisions, then things no longer have a meaning and their existence seems “dull, obscene, gratuitous” They feel that they are superfluous “I want to leave, to go somewhere, where I would really be in my place and fit in…But my place is no where: I do not belong”. (6)

Sartre states that man has no paramount reality, no pre-determined text: he creates his own reality. He is a Roquentin, who says “I am in the midst of things, nameless things. Alone without words, defenseless, they surround them, are beneath me, along me. They do not impose themselves: they are there”. (7)

Expressing the existentialist view the ‘Nausea’ portrays that we are “trapped in existence”, leaving in a completely meaningless world. Not principles that we use for ordering or comprehending events have any basis. But we cannot escape having to deal with ‘existence’, having to make sense out of it. All that we can tell is that this world which are confronted with his utterly arbitrary when we realize the unintelligibility of the world, our inability to withdraw from contact with it, and our need for finding some principle of order or intelligibility, we are then ready for the existentialist message. One first has to be overpowered by the ‘Nausea of existence’, has to acknowledge that the pattern of our lives is due to totally arbitrary ways of living and that any others would do as well.

At this point, we are confronted with our “dreadful freedom”, recognising that we are completely free to choose our world-view, our way of living in the world. More over since we are completely free, there is no way in which we can find guides for our choice, no way we can avoid making a choice and no way of escaping from the consequences of the choices – our basic decisions.

Thus, Nausea, Sartre’s famous novel, Portrays most force fully this condition of man’s plight . The hero has been moving through life on the basis of an unquestioned acceptance of a certain outlook. But his dis-satisfaction with events forces him to ask whether this is the proper outlook. The quest for some justification for his way of life brings about its disintegration into pure Nausea, as the arbitrary frame work into which he has previously organised his word disappears. All that he is left with is the complete confusion of his in escapable existence and the realization that it has no meaningful order. When he becomes aware that only by his decision can be find a means of organising experience and a way of life, he is overwhelmed with the magnitude of the predicament that confronts him. He cannot avoid being a free agent. He cannot act unless he exercise his freedom and chooses some arbitrary outlook and order to make sense out of his world. Possible most frightening of all, he is permanently burdened with all the consequences of his decision for which he and he alone is responsible, and this is a ‘dreadful responsibility’. Man is involved inevitably in anguish because his decision is never grounded in an external authority upon which he can rest the responsibility for his action. He must bear it alone. And when Sartre says alone, he means absolutely alone, for not only is their no God to share the burden, but there is no structure a priori for values to rest upon. For Sartre, the God does not exist is a dreadful fact that makes an ultimate difference to the world and to man.

The philosophy of existentialism found a particular relevance during two world wars. The catastrophic collapse of Europe, the horrible experience of the Nazi dictatorship and occupation of France, have left people with a sense that their views and values are meaningless. The world in which they, and we, have to live not longer seems susceptible to rational examination. Instead, only arbitrary beliefs seem able to give us a key to how to live in the face of an unintelligible universe.

To the common criticism that Sartre’s philosophy, and indeed existentialism in general, is pessimistic, he replies that such a charge can come only from those who are fearful of the truth that life is genuinely difficult. Sartre says that, “Existentialism is nothing else than an attempt to draw all the consequences of a coherent atheistic position”. The discovery that there is no God and that man is alone, is the beginning of a genuine humanism that dignifies man as the free creature of all values of a whatever meaning there is in human existence. Further, he clearly states that existentialism does not ignore the human society and that in taking a decision it decides on behalf of the whole mankind. Existentialism does not aim at plunging man into despair : its final goal is to prepare man through anguish, abandonment and despair for a genuine life, it is basically concerned with the human condition as a complete form of choice. The fundamental issue, therefore, is authentic meaning of life.

Abstract:
The rural world which is home to about three-quarters of the world’s poorest people faces profound challenges in terms of its limited resources such as water, land, and its younger people. Agriculture can help reduce poverty, raise incomes and improve food security for a majority of poor who lives in rural areas. The decline in the share of agriculture in total production and employment is causing serious challenge across region even though much agricultural investments and technological innovations are boosting its productivity. This paper discuss about the trends and challenges to the future of food and agriculture sector. The trends includes the population growth, deforestation, climate changes, agricultural innovation, transboundary pests and diseases, poverty, changes in food system, conflicts and natural disasters. The challenges of the food and agriculture sectors facing mainly includes spread of transboundary pests and diseases of plants and animals, degradation of natural resources, migration from rural areas and changes in nutrient content of foods.

Key words: poverty, deforestation, nutrient content
1. Introduction:
The agricultural and food industry is facing huge challenges. It has to feed a rapidly growing world population while at the same time ensuring the best-possible conservation of our scarce natural resources. Increasingly extreme weather conditions such as droughts and flooding, limited arable land and changing dietary habits make this task even more demanding. The majority of extremely poor people lives in marginal areas and relies on small-scale agriculture. While the world currently produces enough food to feed everyone, at least one billion people remain food insecure.
The migrations to metropolitan cities from rural areas are at their highest levels due to industrialization. Much of humanity’s progress has come at a considerable cost to the environment. The impacts of climate change are already being felt and it will intensify considerably in the years ahead. Globally integrated production processes have brought many benefits. The purpose of this report is to increase understanding of the challenges that food and agriculture sector are facing now and hereafter. It analysis most of the major global trends and challenges to achieve food security and nutrition for all and making agriculture sustainable.

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2. Trends in food and agriculture sector:
The following section mainly concentrates seven important trends that will shape the future of food and the livelihoods of those depending on food and agricultural systems. Most of the trends are strongly inter-connected.

2.1 Population growth, Urbanization and Conflicts:
Global population growth is slowing, but Africa and Asia will still see a large population expansion. By 2050, the world’s population will have grown to nearly 10 billion. The Two-thirds of these people will live in cities. The projected growth in the world’s population is likely to be concentrated in Africa and South Asia and in the world’s cities. It could seriously risk the overall development prospects of these regions, as they rely on agriculture for employment and income generation. More over the agriculture cannot expand due to stressed land and water resources.
The one of the major factor for food insecurity and malnutrition is a surge in the number of conflicts especially in last decade. About half of the world’s poor live in states characterized by fragility and conflict. The highest levels of malnourishment noticed in the countries those affected by violent conflict. Conflicts entail the physical destruction and plundering of crops, livestock and food reserves, while recruitment into fighting forces drains key sources of labour. They have become a global issue with the displacement of people and migration, such as in the case of the ongoing civil war in the Syrian Arab Republic.

2.2 Global economic growth and food prices:
The economic growth could accelerate dietary transitions and drive up agricultural demand. Economic growth has been sizeable in the last decades due to developments in low- and middle income countries. The rapid income growth in developing countries has given rise to a global middle class. This growth enables acceleration in dietary transitions. The more demand for food is changing towards higher consumption of meat and dairy products and other more resource-intensive food items. This carries serious implications for the sustainable use of natural resources. The economic growth in emerging countries has serious impact on future levels of food prices.

2.3 Natural Resources:
The expansion of agricultural land continues to be the main cause of deforestation. Almost half of the forests that once covered the planet are now gone. Groundwater sources are being rapidly depleted. Biodiversity has been severely eroded. Every year, the burning of fossil fuels emits billions of tones of greenhouse gases into the atmosphere. The result is global warming and climate change.
The most of the countries planning to use bioenergy as an alternate to fossil fuels cause the maximum utilization of natural resources for energy. The consumption of cereals, oilseeds and sugarcane for the production of biofuels has increased due to use of biomass as a substitute for petrochemicals. The greater competition between food and non-food uses of biomass has strengthened the interdependence between food, feed and energy markets. For example, around two-thirds of the bioenergy used worldwide involves the traditional burning of wood and other biomass for cooking and heating. The huge demand from agriculture, industry and cities has led to water scarcity. The Food and Agriculture Organization estimates that over 40 percent of the world’s rural population lives in river basins that are classified as water scarce.

2.4 Climate Change:
The food production, food security and nutrition will be affected by climate change. The less reliable supplies of water and high temperatures will also create severe hardships for small-scale livestock producers. The increasing variability of precipitation and frequency of droughts and floods are likely to reduce the crop yields. The number and intensity of natural disasters has risen over the past 30 years. The climate change’s impact not only restricted to food supply but also to food quality, access and utilization and the stability of food security.

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