Study of haze emission efficiency based on new co-opetition data envelopment analysis

As haze intensifies in China, controlling haze emission has become the country's top priority for environmental protection. Because haze moves across different regions, it is necessary to develop a data envelopment analysis (DEA) model underpinned by both competition and cooperation to evaluate the haze emission efficiency in different provinces. This study innovatively adopts the spatial econometrics to construct the co-opetition matrices of Chinese provinces, then builds the co-opetition DEA model to evaluate the haze emission efficiency of them, and finally uses the haze data of 2015 as an example to assess the applicability of the model. The results of the study include the following: First, compared with the traditional CCR (A. Charnes & W. W. Cooper & E. Rhodes) model, this study constructs the co-opetition DEA cross-efficiency model that integrates haze's feature of cross-border moving; thus, it is more in line with the reality of haze emission and movement. Second, compared with the efficiency value gained from the CCR model, the haze emission efficiency values for Tianjin and Guangdong, two decision-making units, register greater variance when using the DEA model. The reason might lie in that they have a different spatial transportation relationship with their surrounding provinces. Third, the haze emission efficiency of provinces, according to the evaluation based on the co-opetition DEA method, varies greatly: Those with high efficiency are mostly inland provinces with slow economic growth and adverse climatic conditions, whereas many of the provinces with low efficiency are located in the relatively prosperous East China. The specific co-opetition DEA model constructed in this study enriches the research on the DEA model, which can be applied to the emission efficiency evaluation of similar pollutants around the world and can contribute empirical support to the haze reducing efforts of the government with its empirical results.     

Disappearance and recovery of colossal permittivity in (Nb+Mn) co-doped TiO2

We investigate the effects of doping and annealing on the dielectric properties of metal ions doped TiO₂ ceramics. Colossal permittivity (CP) above 10⁴ was observed in single Nb ion doped TiO₂, which was dominated by electron transport related interfacial polarization. Moreover, the CP can be dropped to 120 when simultaneously introducing Mn ion into the sample. The disappearance of CP behaviors maybe due to the multivalence of Mn which would inhibit the reduction of Ti⁴⁺ to Ti³⁺, and thus reduce delocalized electrons. Interestingly, the CP was recovered for the (Nb+Mn) co-doped TiO₂ after post-sintering heat treatment in N₂ atmosphere. The recovery of CP in the sample after annealing can be ascribed to the semiconducting grain and the insulating grain boundary, according to impedance spectroscopy. We therefore believe that this work can help us understand the mechanism of CP from a new perspective.     

DRB32在提高异种机互连传输中的应用

字结构不同的计算机互连，以往用软件转换字结构，增加了软件开销，导致传输效率降低。现介绍一种用硬件逻辑转换的方案，在数据传送过程中，使一台计算机的数据结构适应另一台计算机的要求。简捷、可靠、快速，大大地提高了异种机互连的传输率。     

铜蒸汽激光器双闸流管触发系统的研究

研制成用于钢蒸汽激光器的双间流管触发系统。用两个闸流管并联进行交替触发，总输入电功率达7．8kW。低功率运行时，激光器的效率为0．6％与单间流管激光器的效率一致。     

随钻气侵检测仪在胜利油田的应用

简要介绍了随钻气侵检测仪的结构特点、工作原理、现场模拟试验及应用情况。中原油田全尺寸实验井和胜利油田６口井的现场试验及应用结果表明，该仪器能实现早期气侵检测，比常规方法检测到气侵的时间明显提前，对高压气井和复杂地层井控具有重要的现实意义。     

电机转子线圈焊接工艺及设备研究

本文就电机转子线圈采用电阻钎焊的可行性进行了论述,并就几种焊接方法的接头性能进行了分析对比,同时还阐述了电机转子线圈电阻钎焊机的结构原理。     

Dynamic watermarking scheme for quantum images based on Hadamard transform

In this paper, a novel watermarking scheme for quantum images based on Hadamard transform is proposed. In the new scheme, a unitary transform controlled by a classical binary key is implemented on quantum image. Then, we utilize a dynamic vector, instead of a fixed parameter as in other previous schemes, to control the embedding process. The dynamic embedding vector is decided by both the carrier quantum image and the watermark image, which is only known by the authorized owner. The proposed scheme is analyzed from visual quality, computational complexity, and payload capacity. Analysis and results show that the proposed scheme has better visual quality under a higher embedding capacity and lower complexity compared with other schemes proposed recently.     

量子图像处理问题综述

量子图像处理问题将是量子计算机时代媒体信息处理的一个主要问题。量子图像处理包括一般的处理问题和安全方面的处理问题。本文介绍和分析了量子图像表示方式和处理等问题的最新研究成果。首先给出了目前量子图像处理的一般架构,然后介绍了目前流行的量子图像表示方法、并根据不同的量子图像处理目的对现有的处理算法进行了分类和分析,最后总结并展望了量子图像处理领域的未来发展方向。     

二氢茉莉酮酸甲酯的合成进展

二氢茉莉酮酸甲酯是一种重要的合成香料,目前尚未见有直接从天然产物中提取的产业化文献报道,其香气独特优异,性质稳定,对其合成方法的研究一直是化学工作者们的科研热点。本文对其合成方法的研究进行了综述。     

碗米坡水电站水机一级过速保护优化和改进

本文主要介绍了碗米坡电厂水机一级过速保护的组成部分和设计原则,分析了碗米坡水电厂水机一级过速保护在甩负荷试验中该保护误动作导致事故停机问题,并详细阐述相应的优化和处理方法。