无卤阻燃聚乙烯穿线管专用料的研制

采用表面活性剂和其它处理助剂对Ａｌ（ＯＨ）３、Ｍｇ（ＯＨ）２的表面进行复合处理，加入红磷、聚磷酸铵作为阻协效剂，并加入其它的助剂改善聚乙烯体系的抑烟性能和阻滴性能，研制成无卤的阻燃聚乙穿线管专用料。     

Downlink Specific Linear Equalization for Frequency Selective CDMA Cellular Systems

We derive and compare several linear equalizers for the CDMA downlink under frequency selective multipath conditions: minimum mean-square error (MMSE), zero-forcing (ZF), and RAKE. MMSE and ZF equalizers are designed based on perfect knowledge of the channel. The downlink specific structure involves first inverting the multipath channel to restore the synchronous multi-user signal transmitted from the base-station at the chip-rate, and then correlating with the product of the desired user's channel code times the base-station specific scrambling code once per symbol to decode the symbols. ZF equalization restores orthogonality of the Walsh-Hadamard channel codes on the downlink but often suffers from noise gain because certain channel conditions (no common zeros) are not met; MMSE restores orthogonality only approximately but avoids excessive noise gain. We compare MMSE and ZF to the traditional matched filter (also known as the RAKE receiver). Our formulation generalizes for the multi-channel case as might be derived from multiple antennas and/or over-sampling with respect to the chip-rate. The optimal symbol-level MMSE equalizer is derived and slightly out-performs the chip-level but at greater computational cost. An MMSE soft hand-off receiver is derived and simulated. Average BER for a class of multi-path channels is presented under varying operating conditions of single-cell and edge-of-cell, coded and un-coded BPSK data symbols, and uncoded 16-QAM. These simulations indicate large performance gains compared to the RAKE receiver, especially when the cell is fully loaded with users. Bit error rate (BER) performance for the chip-level equalizers is well predicted by approximate SINR expressions and a Gaussian interference assumption.     

USED CARS测量对撞式扩散火焰的温度分布

介绍了用USED CARS技术测量对撞式甲烷/空气扩散火焰前滞止区和尾流区的温度分布剖面。在滞止区富甲烷边观察到甲烷燃烧前的热解过程;尾流区温度高于滞止区温度,表明在滞止区有未完全燃烧的中间产物存在,在尾流区发现C2及CH的光谱也证明了这一点。     

Premixed edge flame in a counterflow field with a stretch rate gradient

An edge flame was established in a counterflow field with a stretch rate gradient using twin rectangular burners which were misaligned by a few degrees. The stretch rate gradient was quantitatively defined as a function of the angle between the two burners and the distance from the edge of the burner, and thus the effect of stretch rate gradient on the behavior of the edge flame was investigated. The local chemical reaction rate at the edge of a CH₄/air flame was stronger than that at other parts of the flame. On the other hand, the reaction rate at the edge of a C₃H₈/air flame was weaker than that of other parts of the flame. The curvature of the flame edge of the CH₄/air flame was much larger than that of the C₃H₈/air flame. These results are thought to be due to the effect of the Lewis number. The ratios of the local stretch rate at the flame edge to the extinction stretch rate for planar twin flames with the same composition as the edge flame were 0.5 to 0.7 for the CH₄/air flame and 0.6 to 0.8 for the C₃H₈/air flame. These values were midway between those in the numerical simulation by Daou and Linan and those in the experiment by Liu and Ronney. Moreover, it was shown that an increase in the stretch rate gradient resulted in a lower local stretch rate at the flame edge. Behavior of the edge flames did not depend on the Lewis number of the mixture.     

矢量信道统计特性及仿真

研究了矢量信道在时域和空间域对信号的影响，即信号的快衰落特性。充分考虑了时延扩展，到达角，角度扩展，角度功率谱，多普勒效应等空域时域关键参数，并给出了仿真结果，对于研究矢量信道特性有重要意义。     

纺织品设计专业教学中学生发散思维培养

发散思维是一种创造性思维，常用于技术开发和产品设计。本文结合专业教学特点，从三个方面探讨如何训练纺织品设计专业学生的发散思维能力和如何运用发散思维。     

The quality and sensory attributes of cookies supplemented with fluted pumpkin (Telfairia occidentalis Hook) seed flour

Replacing wheatflour (WHF) with defatted fluted pumpkin (Telfairia occidentalis Hook) seed flour (FPF) at levels of 0–25% was investigated for its effect on chemical, physical, sensory and nutritional properties of cookies (biscuits). Protein quality was evaluated by using weanling albino rats fed a diet of cookies, which were formulated to supply 10% protein, with a casein diet as a control. Up to 15% substitution of WHF with FPF produced acceptable cookies with spread ratio, hardness, colour and flavour similar to the control (100% WHF) cookies. Use of higher levels (20–25%), however, resulted in reduction in these quality attributes. When WHF was replaced with 15% FPF, there was an increase of 84.6% in crude protein, 62.9% in calcium, 131.0% in potassium and 61.6% in phosphorus contents of composite cookies. There were no significant (P > 0.05) differences between the values obtained for protein efficiency ratio, net protein ratio and true digestibility of cookie diets containing 15–20% FPF, and casein when fed to rats.     

湍流扩散火焰数值模拟中若干影响因素的研究

应用CFD商业软件FLUENT,对火焰CVD法制备纳米颗粒的湍流扩散燃烧过程进行了数值模拟,分析了边界条件、物性以及辐射等因素对温度场的影响,尤其在低雷诺数下分子扩散对湍流计算中的不可忽略性进行了说明。计算的火焰形状与长度与实验中所观察的相符。     

具有梯形衬底结构半导体激光器的稳态特性分析

本文导出了梯形衬底半导体激光器的侧向扩展电流分布并提出了一种新的分析梯形衬底激光器稳态特性的模型。根据这一模型对梯形衬底双异质结结构和大光腔结构进行了分析和比较。分析结果和文献报道的实验结果很好地符合。     

镁离子改性MPP对玻璃纤维增强聚酰胺66的阻燃研究

研究了三聚氰胺聚磷酸盐（MPP）和镁离子改性三聚氰胺聚磷酸盐（Mg-MPP）分别对玻璃纤维增强聚酰胺66（PA66）的阻燃效果、热降解行为以及力学性能的影响。结果表明，在相同添加量的情况下，添加Mg-MPP比添加加PP有着更高的阻燃效率，氧指数提高了近16％。同时还提高了材料的热稳定性，起始分解温度提高26．5℃，残炭量增加。此外，Mg—MPP阻燃玻璃纤维增强PA66的力学性能明显优于MPP阻燃玻璃纤维增强PA66，其拉伸强度、弯曲强度和悬臂梁缺口冲击强度分别比后者提高了11．8％、6．5％和18．5％。