Xem 1-20 trên 43 kết quả Energy yield
  • But what happens if interest rates unexpectedly rise by a significant amount, say 4 percentage points across the yield curve? Such a move has happened only twice in the United States, once in 1980 and again in 1981, as the Federal Reserve drove interest rates higher in an effort to combat high inflation. But in relative terms, if interest rates jumped from 2.9% to 6.9%, that rise would constitute a 140% change in rates—a change that has never occurred in the United States, and one that would be truly significant.

    pdf8p taisaocothedung 12-01-2013 26 1   Download

  • Lecture Biology - Chapter 7: Pathways that harvest chemical energy. The topics discussed in this chapter are: How does glucose oxidation release chemical energy? What are the aerobic pathways of glucose metabolism? How is energy harvested from glucose in the absence of oxygen? How does the oxidation of glucose form ATP? Why does cellular respiration yield so much more energy than fermentation? How are metabolic pathways interrelated and controlled?

    ppt71p tangtuy05 01-04-2016 4 1   Download

  • The possibility of producing ethanol from biomass such as maize cobs and groundnut shells was investigated. Different concentrations of sulphuric acid (H2SO4) were used to determine the acid concentration that could produce an optimal yield of glucose. The results revealed that 4.5M H2SO4 produced the optimal yield of glucose and ethanol. This acid concentration was then used for the study of temperature effects on yield of glucose. The results indicated that glucose yield increased with temperature within the experimental set-up....

    pdf5p nguyenngocsonctu 30-11-2010 66 13   Download

  • The diet is the source of some 40 nutrients for human beings. These classically are divided into energy-yielding dietary components (carbohydrates, fats, and proteins), sources of essential and nonessential amino acids (proteins), essential unsaturated fatty acids (fats), minerals (including trace minerals), and vitamins (water-soluble and fat-soluble organic compounds) (see Shils et al . , 1999).

    doc63p vanass 01-04-2011 33 9   Download

  • Pulsed lasers are available in the gas, liquid, and the solid state. These lasers are also enormously versatile in their output characteristics yielding emission from very large energy pulses to very high peak-power pulses. Pulsed lasers are equally versatile in their spectral characteristics.

    pdf0p 123859674 04-07-2012 23 9   Download

  • IN BOTH NATURAL AND AGRICULTURAL CONDITIONS, plants are frequently exposed to environmental stresses. Some environmental factors, such as air temperature, can become stressful in just a few minutes; others, such as soil water content, may take days to weeks, and factors such as soil mineral deficiencies can take months to become stressful. It has been estimated that because of stress resulting from climatic and soil conditions (abiotic factors) that are suboptimal, the yield of field-grown crops in the United States is only 22% of the genetic potential yield (Boyer 1982).

    pdf34p anhphuonggl 11-04-2013 47 7   Download

  • Tham khảo bài thuyết trình 'chapter 5. lipid metabolism', khoa học tự nhiên, công nghệ sinh học phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

    ppt64p zingzing09 21-10-2012 30 6   Download

  • Simulated Annealing is a probabilistic meta-heuristic that is based on statistical mechanics: while at high temperatures molecules in a liquid move freely, the slow reduction of temperature decreases the thermal mobility of the molecules. The final state forms a pure crystal which also corresponds to a state of minimum energy. We encourage readers to explore SA in their work, mainly because it is simple and because it can yield very good results.

    pdf0p greengrass304 18-09-2012 38 5   Download

  • Wind energy developments may impair the setting ofhistoric sites and can compromise the visual amenity ofthe wider landscape,detracting from historic character,sense of place,tranquillity and remoteness.In certainconditions,indirect impacts can also include noise andshadow flicker from turbines.Turbines towers are now typically in excess of 60 metres in height and may have a zone of visualinfluence more than ten kilometres in radius.

    pdf57p yeurauxanh88 01-10-2012 24 5   Download

  • As shown in Table 2, the area of agricultural land worldwide is larger than that of forests (FAOSTAT Resources 2009). Furthermore, non-wood fibres usually have high annual biomass yields per hectare which are equal or superior to that of woods (Pierce 1991). Approximately 30% of the forest area is used primarily for the production of wood. An additional 24% of the forest area is designated for multiple uses, which also includes the production of wood in most cases (FAO 2010).

    pdf108p loixinloi 08-05-2013 15 5   Download

  • Revenue insurance accounts for more than half of all crop insurance policies (Figure 2). It began in 1997 as a buy-up option on a pilot basis for major crops. By 2003, acreage under revenue- based insurance exceeded acreage covered by APH policies. Revenue insurance combines the production guarantee component of crop insurance with a price guarantee to create a target revenue guarantee. Under revenue insurance programs, participating producers are assigned a target level of revenue based on market prices for the commodity and the producer’s yield history.

    pdf27p quaivatxanh 29-11-2012 21 4   Download

  • Measurement of efficiency started with Farrell (1957) who, following Debreu (1951) and Koopmas (1951), proposed a division of efficiency into two components: technical efficiency, which represents a firm’s ability to produce a maximum level of output from a given level of inputs, and allocative efficiency, which is the ability of a firm to use inputs in optimal proportions, given their respective prices and available technology. The combination of these two measures yields the level of economic efficiency.

    pdf87p loixinloi 08-05-2013 15 4   Download

  • By converting wind energy into electricity,windturbines reduce the environmental impact of powergeneration.Wind energy is currently the mostdeveloped of a number of renewable energytechnologies,with more than 1,000 wind turbinesalready operating across the UK,producing around one quarter of one percent of the country’s energy.Wind turbines can be deployed individually,to power a single site or installation,but are most commonlygrouped together as ‘wind farms’to provide power to the national grid.

    pdf35p yeurauxanh88 01-10-2012 29 3   Download

  • Sugarcanehasbeenprimarilyusedtoproducesugarandmolasses.Itiscropthatisgrownin tropicalandsubtropicalclimatesduetoitshigheragriculturalyields.However,thereareseveral coproductsthatcanbeobtainedinvariousstagesofthehandlingofthecropthatcontributeto theaggregate value to theproduction,which isof importance indevelopingcountries facing increasingpricesofnonrenewablefuelsandcyclicalvariationofsugarprices. Forcanesugar industries inoperationaround theworld, there isasubstantialprocessingof sugarcane.

    pdf94p loixinloi 08-05-2013 12 3   Download

  • In 2002, Shapouri et al. surveyed energy values and reported that fuel ethanol from corn produced about 34 percent more energy than it took to produce it. That figure was based on a weighted average of a 37-percent increase in energy from ethanol produced in dry mills and a 30-percent increase from wet mills. This value was revised in 2004 by updating energy estimates for corn production and yield, improving estimates of energy required to produce nitrogen fertilizer and energy estimates for seed corn, and using better methodologies for allocating energy for producing coprod- ucts.

    pdf38p loixinloi 08-05-2013 22 2   Download

  • According to official statistics, the area annually planted to maize in Ghana currently averages about 650,000 ha (Table 1). Most of the maize grown in Ghana is cultivated in association with other crops, particularly in the coastal savannah and forest zones, so planting densities are generally low. Average grain yields of maize are correspondingly modest when expressed per unit land area, averaging less than 2 t/ha. Total annual maize production is currently estimated at just over 1 million tons.

    pdf18p loixinloi 08-05-2013 14 2   Download

  • The results of experiments involving direct comparisons of root and penetrometer resistance indicate that penetrometers experience two to eight times greater resistance than plant roots penetrating soil (Table 1). Dexter (1987) suggests that this ratio of penetrometer resistance to root resistance is positively correlated with soil strength, being greater in ‘stronger’ soils.

    pdf49p loixinloi 08-05-2013 13 1   Download

  • With increasing energy demands, dwindling fossil energy resources, and environmental concerns associated with criteria pollutants and greenhouse gases, significant attention in the power generation community has been focused on increasing efficiency and reducing emissions. A highly efficient and low-emission concept is the fuel cell gas turbine (GT) hybrid. Hybrid systems are comprised of fuel cells integrated with a GT engine. A variety of potential configurations have been proposed and a number of cycles have been investigated.

    pdf11p congdat261 23-11-2010 72 21   Download

  • I. Introduction An important aspect of nuclear reactor core analysis involves the determination of the optimal coolant flow distribution and pressure drop across the reactor core. On the one hand, higher coolant flow rates will lead to better heat transfer coefficients and higher Critical Heat Flux (CHF) limits. On the other hand, higher flows rates will also in large pressure drops across the reactor core, hence larger required pumping powers and larger dynamic loads on the core components.

    ppt259p giotletinh_hd2009 20-04-2013 55 16   Download

  • Discovered almost fifty years ago at Bell Labs (1964), the Nd:YAG laser has undergone an enormous evolution in the years, being now widely used in both basic research and technological applications. Nd:YAG laser is extremely versatile in its output characteristics, yielding emission from continuous wave to very large energy pulses or very high peak-power pulses. Also, it covers a large spectral range, namely near infrared, visible (second harmonic) and ultraviolet (third to fifth harmonic).

    pdf328p qsczaxewd 25-09-2012 27 13   Download

Đồng bộ tài khoản