Yalnizca

The World and Modern Science

  • Hydrology

    Filed under News
    Oct 1

    Superficial draining of saturation of the ground? This small text constitutes an attempt to display this process hidrolgico that occurs in the ground. In ground where fretico sheet is placed next to the surface to the ground, during a rain event, the recharge of the sheet it starts to occur being able to cause the ascension of the same until reaching the surface. In this situation the alone one starts to be saturated and has a fine water film of the sheet that starts to flow off in the surface. This fine film receives the name from return flow. In addition, for being saturated, the incident precipitation in this region of outcrop of the fretico sheet starts to also flow off on the surface of the ground since it meets saturated, that is, with all its porous one filled by water. Therefore, in this region of saturation of the ground, the superficial draining occurs in such a way for the outcrop of the sheet (return flow) how much for the direct rain incidence in these saturated areas (made marshy). To the set of these two processes that together they produce draining superficial attributes the name of superficial draining due to saturation of the ground. To have idea, one of the places where this process occurs generally in next zones to the rivers and, in this direction, any addition of some potentially pollutant composition in this region has highest possibility (probability) of being loaded for waters of the related superficial draining due to saturation of the ground, being able to compromise the quality of water of the body dgua.

    Chemical preparation from: DUNNE, T. Field studies of hillslope flow you process.

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  • North American

    Filed under News
    Sep 14

    The spaces of urban production if had given outside of the urbansticas utopias and the ambient models in question. The agrarian interests are the determinative factor in the relation between city and environment, as Spirn says: ' ' The magnitude of the migration durante' ' centuries XIX and XX for the suburbs had led, finally, the ambient problems of the city for the field, creating a massive wall of private properties between that the interior of the city and the agricultural areas lived more beyond in, a still more effective wall in the separation of the city in relation to the surrounding field of what the ample blockhouses of centuries XVII and XVIII (Spirn, 1995, P. 51). It is clamorous in the middle of century XX, the increase of the degradation process and of they will artificializaro of natural ecosystems in virtue of the increase of the processes of urbanization and the industry being, therefore, sufficiently investigated for theoreticians especially, in developing countries. More information is housed here: Seth Klarman. Marked deeply for the North American influence, the urban theories in century XX mainly at two distinct times: at the first moment, between the two great wars, with the research of the School of Chicago, about the mechanisms of integration and social desgornizao in the great cities at times of accented growth. As the moment, then after World War II, represented for the School of Michigan, with the phenomena of urban diffusion and constitution of regions independent and hierarquizadas metropolitans as Castells praises, 1972, grifo ours. No longer middle of years 1980 a great number of produced theories placed in quarrel the influence of the economy globalizada in the processes of accumulation of capitals, influenced in the flexibilizao of the production in the period after-fordista, and its influences in the processes of production of the urban spaces territorial. All this quarrel allowed in them to advance in the investigation and the agreement of the effect of these new forms of production in the relation between the city and the environment.

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  • Aug 22

    Improper disposal of household waste in large cities, found its solution gives the waste to the periphery; hiding underground in landfills, throwing them into rivers or simply by burning them. A reality that even some countries, cities do, regardless of the consequences should be Notably, in areas where these giants are located waste containers (many of them if you have the necessary health conditions), is on the outskirts of the city, which houses low-income people in slums. Many of these dumps up not only sites of infection and contamination, but a way of life for those engaged in the rubbish. That shows a lot in some cities of Venezuela, Caracas, Valencia, Barquisimeto, Puerto Cabello, to name a few. Very valid point when he notes that at present the change in lifestyle and economic growth in Latin American countries has led to an increase in the generation of household and commercial waste. The problem is completed with the change in consumer habits and diversified composition of modern waste (plastic bottles, cans, computers, etc.). Very true, as noted, the appliances, computers have created new technology and real cemeteries, plastics and composite materials that are not degraded. Western Union is open to suggestions. Their elimination is a concern of the new century, so it is not easy to find effective treatment and pollution removal, unless it is recycled.

    Keep in mind this reality highlights to Salvatierra, who according to American and Caribbean Initiative for Sustainable Development (ILAC) "the city's population of Latin America and the Caribbean is now for 78 percent of the total, the highest rate of urbanization hemisphere and the trend remains to greater concentration in cities, where people are growing in the period 2005-2010 at a rate of 1.7 percent each year. " The challenge now is to contain the debris from the big cities generate. For the United Nations Organization (UNO) is called household waste "any material that has no direct use value and is discarded by their owners." These are generated in homes, offices, educational establishments, as well as commercial and restaurants, including those that are generated in the hospitals, which have compositions similar to those designed within the household. The problems facing Latin American countries according to a study by ECLAC (Economic Commission for Latin America and the Caribbean) is that "it is remarkable change in composition of the waste where there is a decrease in biodegradable materials and thus challenges for treatment, recovery and disposal of MSW (Municipal Solid Waste). " That is, there is a greater preponderance of inorganic wastes, which do not decompose and toxic properties of elements. However, in recent years in Latin America have developed projects designed to alleviate this situation, which seeks the minimization of waste from reduce, reuse and recycle these items. However, many countries of the region continue to have problems with waste disposal and landfills, as well as to landfills open Undoubtedly, the call is very important, that it is necessary that every inhabitant of the planet is aware of what gives it away, that everything that is wasted can damage the environment. It is also important to seek clearance mechanisms be as clean as possible to avoid its impact on the natural life of the planet and people

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