Measuring Environmental Performance of Provincial Thermal Power Plants in China: A Malmquist DEA Approach with Fixed-Sum Undesirable Outputs

With the development of China’s economy, environmental pollution has become cumulatively serious. The primary source of environmental pollution is thermal power generation, which has attracted the attention of governments and academia in recent years. To effectively reduce environmental pollution, research should study how to constrain the undesirable output of thermal power plants, that is, to limit the total undesirable output of the plants to a certain fixed sum. However, few studies have suggested that these undesirable outputs should be fixed-sum outputs. Moreover, no previous research publication about thermal power plants has analyzed their environmental performance changes. To address these gaps, a novel Malmquist-DEA approach is proposed for evaluate the environmental performance of thermal power plants in this paper. This approach generalizes the equilibrium efficient frontier DEA model with fixed-sum undesirable outputs and incorporates the model into the Malmquist productivity index (MPI). The authors apply this approach to the analysis of provincial thermal power plant environmental performance in China and analyze such plants’ trends based on panel data from 2011 to 2014. The empirical research shows that the environmental performance of regional thermal power plants was positively affected by efficiency change and negatively affected by technical change. Finally, the authors provide policy suggestions based on our findings.

     

Azimuth resolution improvement for spaceborne SAR images with quasi-non-overlapped Doppler bandwidth

The azimuth resolution improvement problem is solved via a coherent combination of synthetic aperture radar （SAR） ima-ges with the quasi-non-overlapped Doppler bandwidth. Prior to the spectra combination, SAR images should be coregistered, while phase biases induced by topography, atmospheric propagation delays and baseline measurement errors should be calibrated. However, the coregistration accuracy suffers from large Doppler decorrelation caused by the quasi-non-overlapped Doppler band-width. Furthermore, the method used to estimate phase biases from interferogram of azimuth prefiltered SAR image pairs wil fail when there is no overlapped spectrum. The fringe simulation and maximum sharpness optimization are adopted to deal with the problems. Accordingly, a novel algorithm to coherently synthesize SAR images is presented. The experiment with the Terra SAR X-band （TerraSAR-X） satel ite data validates the performance of the presented method.     

燃煤锅炉产生SO_X的防范技术

讨论锅炉燃煤产生SOX 的机理及目前一些主要的防治措施 ,并对影响炉内固硫技术的若干因素进行了探讨     

掺杂EuSr_2Ru_(1-x)Nb_xCu_2O_8体系的磁性和超导电性

通过对EuSr2 Ru1-xNbxCu2 O8体系的结构、磁化强度和电阻进行观测 ,结果发现 :EuSr2 RuCu2 O8样品呈现超导电性和铁磁性共存 .其超导临界温度为Tconset≈ 35K ,Tc(ρ =0 ) =10K ,铁磁相变温度为TM=130 .2K ;Nb部分替代Ru同时导致铁磁相变温度和超导临界温度的下降 ,前者进一步说明了EuSr2 RuCu2 O8体系中磁有序仅来源于Ru的磁矩 ,而超导临界温度的下降则是由于CuO2 平面载流子浓度下降所致 .     

逻辑综合中关键门的寻找

关键路径一直是电路性能优化的核心问题之一，门的尺寸调整和插入缓冲器是时间优化的重要方法。实际上，电路拓扑图中最长的路径不一定就是关键路径，只有在一定输入下能敏化的最长路径才是关键路径，因此，仅仅按拓扑信息优化最长的路径不一定能真正提高电路的性能，此外，仅仅利用D－算法判断路长敏化有不足之处，本文利用电路拓扑找出超出时间限制的路径，然后利用改进的FAN算法－T－FAN算法，提取关键门－即和电路整体延时有关系的门，为优化指出具体、准确的目标，实验表明，改进的算法在保证优化效果的前提下，能平均减少30％－40％优化对象。     

Demianski-Newman黑洞的热性质及广义Bekenstein-Smarr公式

对于Demianski-Newman(D-N）黑洞，同样存在在外观视界处温度为T＋的Hawking辐射和在内视界处温度为T－的Hawking吸收，其形式与Kerr-Nweman（K－N）黑洞相似，根据D－N黑洞中参数l的一些性质，得到了与参数l有关的广义Bekenstein-Smarr(B-S）公式，对比K－N黑洞的B－S公式，可以推测l－方面与转动效应有关，另一方面又有产生势场，可能是与自旋有关的某种荷。     

供应链效率损失的结构性分析

供应链效率受到结构的制约，据此，从供应链的信息和决策结构出发，分别研究在供应链内部信息对称与不对称情形下，不同的决策结构对供应链效率的影响，探讨非合作决策结构下供应链效率损失的内生性；并得出：销售商（零售商）在供应链内占据的权威越大，则该决策结构就越有效，效率损失也越小。     

VisualFoxPro的有关新特性及应用

本文介绍了VFP环境下的若干有关国际化功能及其在教学与开发中的影响与应用.     

任意循环极限效率的P-V图证明的再讨论

给出了在Ｐ－Ｖ图上用外切卡诺循环证明任意循环极限效率的更直观、更简便的方法     

滇南坝子葡萄酒中的历史真实与文化再生产

历史其实并非是一种绝对的客观与真实,它总是会依据具体情景,融合人们的主观意图、偏好、想象、期待、愿望、信仰等而成为一种构建性真实,从而向人们展现出历史中客观性与构建性两种真实之间的密切联系。文章以云南省弥勒县南乡坝葡萄酒历史的文化生产过程为例,以滇越铁路作为超时空串联这些事件的线路媒介,以此来观察历史真实与文化再生产之间的密切联系。