Suchergebnisse

Abstract. This paper reports the variation in rainfall characteristics associated with debris flows in the Chenyulan watershed, central Taiwan, between 1963 and 2009. The maximum hourly rainfall Im, the maximum 24 h rainfall Rd, and the rainfall index RI (defined as the product RdIm) were analysed for each rainfall event that triggered a debris flow within the watershed. The corresponding number of debris flows initiated by each rainfall event (N) was also investigated via image analysis and/or field investigation. The relationship between N and RI was analysed. Higher RI of a rainfall event would trigger a larger number of debris flows. This paper also discusses the effects of the Chi-Chi earthquake (CCE) on this relationship and on debris flow initiation. The results showed that the critical RI for debris flow initiation had significant variations and was significantly lower in the years immediately following the CCE of 1999, but appeared to revert to the pre-earthquake condition about five years later. Under the same extreme rainfall event of RI = 365 cm2 h−1, the value of N in the CCE-affected period could be six times larger than that in the non-CCE-affected periods.

This research has been performed to emphasize about the problem known as ?climate changes? occurring due to the greenhouse gases emissions (Carbon dioxide (CO2), Methane (CH4),Nitrogen oxides (NOx), Ozone (O3), Chlorofluorocarbons (artificial). Specially, the project will be focused on the CO2 emissions produced mainly from the fossil fuels burning in power plants and other kind of industrial processes. To understand how important the global is warming and therefore the climate change, both the increase of emissions and the evolution of those will be studied in this project drawing conclusions about its effect. The Kyoto Protocol, the most important agreement internationally, signed by a great majority of the industrialized and developed countries, which try to limit the CO2 emissions to the atmosphere, will be cited in this project. Taking into account the effects of global warming and applying the international legislation on emissions of greenhouse gases, a number of measures will be exposed, where the CO2 capture will be studied deeply. Three different kind of CO2 capture technologies will be studied, drawing the conclusion that the post-combustion capture, in particular by amine chemical absorption, is the most efficient one.

OBJECTIVE: Estimates of illicit cigarette consumption are limited and the data obtained from studies funded by the tobacco industry have a tendency to inflate them. This study aimed to validate an industry-funded estimate of 35.9% for Hong Kong using a framework taken from an industry-funded report, but with more transparent data sources. METHODS: Illicit cigarette consumption was estimated as the difference between total cigarette consumption and the sum of legal domestic sales and legal personal imports (duty-free consumption). Reliable data from government reports and scientifically valid routine sources were used to estimate the total cigarette consumption by Hong Kong smokers and legal domestic sales in Hong Kong. Consumption by visitors and legal duty-free consumption by Hong Kong passengers were estimated under three scenarios for the assumptions to examine the uncertainty around the estimate. A two-way sensitivity analysis was conducted using different levels of possible undeclared smoking and under-reporting of self-reported daily consumption. RESULTS: Illicit cigarette consumption was estimated to be about 8.2-15.4% of the total cigarette consumption in Hong Kong in 2012 with a midpoint estimate of 11.9%, as compared with the industry-funded estimate of 35.9% of cigarette consumption. The industry-funded estimate was inflated by 133-337% of the probable true value. Only with significant levels of under-reporting of daily cigarette consumption and undeclared smoking could we approximate the value reported in the industry-funded study. CONCLUSIONS: The industry-funded estimate inflates the likely levels of illicit cigarette consumption. Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://group.bmj.com/group/rights-licensing/permissions. ; published_or_final_version

Abstract. Observations from the South African TrigNet global navigation satellite system (GNSS) and vertical total electron content (VTEC) data from the Jason-1 satellite were used to analyze the variations in ionospheric electron density profiles over South Africa before and after the severe geomagnetic storms on 15 May 2005. Computerized ionospheric tomography (CIT) was used to inverse the 3-D structure of ionospheric electron density and its response to the magnetic storms. Inversion results showed that electron density significantly increased at 10:00 UT, 15 May compared with that at the same period on 14 May. Positive ionospheric storms were observed in the inversion region during the magnetic storms. Jason-1 data show that the VTEC observed on descending orbits on 15 May significantly increased, whereas that on ascending orbits only minimally changed. This finding is identical to the CIT result.

Single factor combined with response surface methodology was used to optimise the process parameters of tea saponin extraction from Camellia oleifera. Four factors including material-liquid ratio, extraction temperature, extraction time, and ethanol concentration were selected as the influencing factors on the basis of single factor. The extraction rate of tea saponin was used as the response factor to analyse the response of these four factors and three levels. Results showed that extraction temperature of 81.69°C, material-liquid ratio of 1:11.85 g/mL, time of 6.17 h, and ethanol concentration of 56.69% were the best extraction conditions. The estimated yield of extraction was 7.46%. Analysis of the tea saponin samples by using high performance liquid chromatography showed that the main peak time was 6.668 min, and the absorption peaks and peaks were symmetric.

Mergers and acquisitions (M&A) are an essential way for enterprises to achieve sustainable development. As large sums of money are typically involved in M&A transactions, financing is a vital factor in outcomes. This study examines the relation between equity and debt financing of M&A on subsequent performance, and the effect of ownership (state-owned enterprises versus private-owned enterprises) on M&A performance in China. We are motivated to examine the relation between financing methods and M&A performance in China because the differences in ownership, resource availability and policy support by the government for many firms may affect subsequent performance. Using a large sample of Chinese A-share listed companies between 2009 and 2016, we find that equity-financed M&A transactions lead to significantly better performance than debt-financed transactions. Equity-financed M&A transactions of state-owned enterprises (SOEs) perform significantly better as compared to debt-financed M&A, whereas equity-financed M&A transactions of private-owned enterprises (POEs) have little effect on their performance. This study extends our insights into the relation between M&A financing types and firm performance under different ownership types in the context of emerging markets.

Crop residue burning influences human health and global climate change. In China—the world's largest crop residue producer—farmers burn almost one quarter of their crop residues in the field after harvest, despite the government providing financial incentives such as subsidies to retain crop residues. This study combined economic analyses with simulations of soil carbon accumulation and carbon emission reduction associated with different residue management practices to determine the minimum level of incentives needed for Chinese farmers to shift from burning to retaining crop residues for generating carbon benefits. Simulation results showed that (Ahmed et al., 2015) the density of topsoil organic carbon in China's croplands would have increased from about 21.8 t ha−1 in 2000 to 23.9 t ha−1 in 2010, and soil organic carbon sequestration would have reached 24.4 Tg C yr−1 if farmers had shifted from burning to retaining crop residues on croplands during this period; and (Auffhammer and Gong, 2015) retaining crop residues would have avoided about 149.9 Tg of CO2 emission per year. Economic analyses showed that (Ahmed et al., 2015) existing subsidies in all regions of China, except Northeast China, only accounted for 18–82% of the incentives required for farmers to shift from burning to crop residue retention; (Auffhammer and Gong, 2015) Northeast China required the lowest incentive (287 CNY ha−1), while eastern China required the highest (837 CNY ha−1); and (Balkovič et al., 2014) the prevailing market prices (1.4–60.2 CNY tCO2e−1) in China's seven pilot carbon markets seem to be below the required incentives (39.6–189.1 CNY tCO2e−1). Our study suggests that the Chinese government should increase subsidies or seek innovative incentive schemes to encourage farmers to change their crop residue management practices for global climate change mitigation and health benefits.

Crop residue burning influences human health and global climate change. In China—the world's largest crop residue producer—farmers burn almost one quarter of their crop residues in the field after harvest, despite the government providing financial incentives such as subsidies to retain crop residues. This study combined economic analyses with simulations of soil carbon accumulation and carbon emission reduction associated with different residue management practices to determine the minimum level of incentives needed for Chinese farmers to shift from burning to retaining crop residues for generating carbon benefits. Simulation results showed that (Ahmed et al., 2015) the density of topsoil organic carbon in China's croplands would have increased from about 21.8 t ha−1 in 2000 to 23.9 t ha−1 in 2010, and soil organic carbon sequestration would have reached 24.4 Tg C yr−1 if farmers had shifted from burning to retaining crop residues on croplands during this period; and (Auffhammer and Gong, 2015) retaining crop residues would have avoided about 149.9 Tg of CO2 emission per year. Economic analyses showed that (Ahmed et al., 2015) existing subsidies in all regions of China, except Northeast China, only accounted for 18–82% of the incentives required for farmers to shift from burning to crop residue retention; (Auffhammer and Gong, 2015) Northeast China required the lowest incentive (287 CNY ha−1), while eastern China required the highest (837 CNY ha−1); and (Balkovič et al., 2014) the prevailing market prices (1.4–60.2 CNY tCO2e−1) in China's seven pilot carbon markets seem to be below the required incentives (39.6–189.1 CNY tCO2e−1). Our study suggests that the Chinese government should increase subsidies or seek innovative incentive schemes to encourage farmers to change their crop residue management practices for global climate change mitigation and health benefits.