Model experiment on anti-deformation performance of a self-supporting transmission tower in a subsidence area

A large number of high-voltage power transmission towers have recently been constructed in mining areas prone to subsidence.In order to ensure the safety of the transmission towers and the safe operati...     

余热制冷技术在玻璃工业中的应用探讨

介绍了两种蒸汽制冷设备的工作原理和特点,并对各自的运行状况作了比较,同时简要分析了在玻璃工业中利用余热制冷的可行性。     

HSV-tk基因/GCV系统治疗肿瘤的旁观者效应与缝隙连接关系的研究

目的 探讨单纯疱疹病毒胸苷激酶（HSV－tk）基因／丙氧鸟苷（GCV）系统杀伤肿瘤细胞时旁观者效应与细胞间缝隙连接的关系。方法 用PA317细胞包装STK质粒（逆转录病毒载体介导的HSV-tk基因），形成假逆转录病毒颗粒，转染有缝隙连接的大鼠胶质瘤细胞C6和无缝隙连接的入宫颈癌细胞 Hela，制成 C6 tk+和 Helatk+细胞，将不同比例的C6和 C6 tk+、Hela和 Hela tk+细胞混合，每种比例8孔，培养 24h后 4孔加入含0．5μg/mlGCV的培养基，4孔作对照，6d后用MTT法测量细胞存活率。在两个培养皿中放入周围粘有33mm高滤纸的载玻片，分别接种 C6、C6 tk+细胞。细胞 80%汇合后将载玻片互换，并加入含0．5μg/ml GCV的培养基，6d后观察细胞形态。结果C6细胞组存在旁观者效应，Heal细胞组不存在旁观者效应。培养皿中tk+细胞大部分被杀死,tk-细胞无变化。结论HSV-tk基因/GCV系统杀伤肿瘤细胞时旁观者效应与细胞间缝隙连接有关。     

Photochromism in composite and hybrid materials based on transition-metal oxides and polyoxometalates

Photochromic materials are attractive and promising for applications in many fields. One subject in this area is to prepare and study the photochromism in composite or hybrid materials based on transition-metal oxides or polyoxometalates. Their properties not depend only on the chemical nature of each component, but also on the interface and synergy between them. Since the charge transfer plays a key role in the photochromism of these materials, it is very important to increase the charge (electrons, holes, and protons) interactions between the two components in either composites or hybrids. To realize this, one big challenge is to optimize the two components on a molecular or nanometer scale, which is closely relevant to the constituents, sample history (pre-treatment, preparation, and post-treatment), environment (humidity, presence of reducible or oxidizible matters, light-irradiation wavelength, intensity, time, etc.). Based on these, many novel composite or hybrid materials with improved photochromism, visible-light coloration, reversible photochromism, multicolor photochromism or, possibly, fast photoresponse, have been prepared during the last two decades or three. This may underscore the opportunity of using these composite and hybrid materials as the photonic applications. In present paper, we summarize thoroughly all the recent progress in these subjects.     

Energy transfer mechanism of GdPO4: RE3+ (RE = Tb, Tm) under VUV-UV excitation

Polycrystal of GdPO₄:RE³⁺ (RE=Tb, Tm) phosphors were prepared by solid-state method. Vacuum ultraviolet excitation and emission spectrum and the energy transfer mechanism between the host and dopants of Tb³⁺ and Tm³⁺ were investigated respectively. The emission of Gd³⁺ at 313 nm was enhanced by the strong absorption of CTS of Tm³⁺ at 180 nm in GdPO₄: Tm. It has also been concluded that the excitation of Gd³⁺ is transferred to Tb³⁺ and then emission peaks of ⁵D_J→⁷F_J of Tb³⁺ were observed.     

工程机械中液压管路件常见故障原因分析及解决办法

液压管路件作为液压系统的一个重要组成部分,在实际应用中经常会产生诸如渗漏、开裂等故障,就工程机械中常见液压管路件的故障产生原因进行了分析,并提出相应的解决办法。     

高校学生党员先进性标准探讨

浅析新时期高校学生党员先进性标准的具体要求,使高校学生党员严格对照标准要求自己,提高党性修养,做社会主义事业的合格建设者和可靠接班人.     

Low complexity iterative decoding for bit-interleaved coded modulation

Bit-interleaved coded modulation with iterative decoding (ID) is an effective scheme for both AWGN and fading channels because it simultaneously realizes large Euclidean distance and high diversity. In the literature, ID schemes with hard-decision feedback (HDF), as well as soft-decision feedback (SDF), have been investigated. While HDF/ID exhibits a performance inferior to SDF/ID, it is much simpler to implement. To enhance the performance of HDF/ID with moderate additional complexity, we propose a uniform soft-decision feedback ID (USF/ID) scheme. The proposed scheme is applicable in both single antenna and multiple antenna communication systems. The simulation results verify that it achieves impressive performance gain over HDF/ID and has a practically more attractive implementation than SDF/ID, especially for complexity-constrained wireless applications.     

多线程技术在嵌入式数据采集系统中的应用

讨论了多线程技术在嵌入式数据采集系统中的应用，给出了PC机与嵌入式计算机系统的多线程串行通信的实现。