环

The results of calculation will be fundmentally consistent with the experimental values.In addition, we calculated dibenzene chromium and its derivatives, ferroceneand its derivatives. The former had higher symmetry. We studied the substituenteffects by calculating their NMR spectra. The results show that: when we add asubstitute group on one ring of dibenzene chromium, the substitute group will affecttwo benzene rings. The effect is similar to the effect of branched alkanes, namely:the effect on neighbouring groups has transmissibility. Furthermore, the nearer theneighbouring group is, the stronger the effect is. This effect is observed not only onthe substituted ring, but also on the unsubstituted ring.

此外，我们重点计算了二苯铬及其衍生物和二茂铁及其衍生物的核磁共振谱，其中二苯铬及其衍生物选择的是对称性较好的体系，通过计算其核磁共振四川师范大学硕士学位论文谱，探讨其取代基效应，结果表明：在二苯铬的一个环上引入取代基后，取代基对两个苯环的影响，类似于支链院烃引入取代基后的影响：即对邻近基团的影响有传递性，并且对离得近的作用强，对离得远的作用弱，这种作用不仅体现在连有取代基的环上，也体现在没有带取代基的环上。

The invention is characterized in that: the ultraviolet flame sensor comprises a uviol piece, a meshed anode which is arranged on the uviol piece, a cathode substrate glass piece, a photocathode which is arranged on the cathode substrate glass piece, a glass ring which is arranged between the cathode and the anode, a vacuum orifice which is arranged on the glass ring, a plastic packaged base which is arranged under the cathode substrate glass piece, a cathode and an anode lead which are adhered to the plastic packaged base and are respectively connected with the cathode and the anode, and a plastic casing which is arranged around the plastic packaged base, the glass ring and the glass piece.

其特征在于，其中包括：透紫玻璃片；网状阳极，该阳极层制作在透紫玻璃片上；阴极衬底玻璃片；光电阴极，该层制作在阴极衬底玻璃片上面；玻璃环，该玻璃环制作在阴极和阳极中间；抽真空口，该抽真空口制作在玻璃环上；塑封底座，该底座制作在阴极衬底玻璃片下面；阴极和阳极引出线，该引出线粘接在塑封底座上，分别与阴极和阳极相连接；塑料外壳，该外壳制作在塑封底座，玻璃环和玻璃片周围。

Chicken feed of model 661 is regarded as raw material of pellet feed, the influence that experimental factors including modulation-character temperature, modulation-character moisture, grease-additive quantity, and comminuting granularity have on making pellet quality, productivity, and electricity consumption. UG and ANSYS are regarded as simulating circumstance in finite element analysis, for problem on service life of the machine, evaluation index that average stress of a series of parameterized loop die is regarded as service life of hoop standard granulator is achieved by dynamic, static, and thermal structure coupling analysis for key part: loop die of the machine. For every influencing factor the experimental arrangement of array and combination is made by adopting optimizing idea and method of experimental design, the aim of quantification analysis is strived to arrive.

在试验设计中，采用正交试验的方法，以611型鸡饲料作为颗粒饲料的原料，分析混合饲料的调质温度、调质水分、油脂添加量、粉碎粒度等试验因素对制粒质量、生产率、电耗的影响；有限元分析中以UG、ANSYS作为仿真环境，针对制粒机使用寿命的问题，通过对环模制粒机中的关键零件环模进行动力、静力、热结构耦合分析，获得一系列参数化后的环模的平均应力作为环模使用寿命的评价指标；以实验设计的优化思想和有限元分析方法对各个影响因素作了排列组合式的实验安排，力求达到量化分析的目的。

The Fourth Band: The fourth band consists of exteriorized entities who are more "advanced" in consciousness than those on the bands below, and have arrived from outside the band areas to prepare for their final human experience on the Earth "below".

第四个环带：第四个环带由意识比下面环带更&先进&的形象化实体、以及来自环带区域以外的准备到&下面的&地球去经历他们最后的人生经验的实体组成。

P: K 8 A; D The Fourth Band: The fourth band consists of exteriorized entities who are more "advanced" in consciousness than those on the bands below, and have arrived from outside the band areas to prepare for their final human experience on the Earth "below".

q2 H9 C& g！ h4 z q2 U； s+ q 第四个环带：第四个环带由意识比下面环带更&先进&的形象化实体、以及来自环带区域以外的准备到&下面的地球去经历他们最后的人生经验的实体组成。

The ring-open nitration of propylene oxide compounds was investigated using dinitrogen pentoxide as nitrating agent.

并以N2O5为硝化剂考察了环氧丙烷类化合物开环硝化过程，探讨了取代基的电子效应和立体效应对环氧丙烷类化合物开环硝化过程的影响规律。

First of all, the history of phase locked technology and the actuality of researches on it are introduced. Then, beginning with the fundamental principles of a phase-locked system, we build the mathematical model based on the architecture of the traditional analog PLL, and afterwards investigate some of its characters such as tracking, acquisition, noising, and stability. The system parameters are developed at the same time, and some universal conclusions on the theoretical analysis of PLL are reached.

论文首先对锁相技术的发展历史和研究现状做了简单介绍，然后从锁相系统的基本工作原理引入，以传统模拟锁相环的结构为基础，分析了锁相环的数学模型，并以此为出发点对锁相环的跟踪性能、捕获性能、噪声性能以及稳定性等各种性能进行了深入的分析，对环路的各项参数指标进行了详细的推导，得出了锁相环数理分析的普遍结论。

AFTN demulsifiers of polyoxypropylene-polyoxyethylene amine ethers are synthesized from oxypropylene, oxyethylene and amine under a lower pressure less than 0.5 MPa and in the presence of the KOH catalyst, oxypropylene polymerizes at (130±5)℃ temperature, and oxyethylene polymerizes at (120±5)℃ temperature.

以伯胺为起始剂、氢氧化钾为催化剂，分别以环氧乙烷［开环聚合温度为(120±5)℃］和环氧丙烷［开环聚合温度为(130±5)℃］为单体，在0.5 MPa以下合成AFTN系列嵌段聚醚型破乳剂。

Our results indicated that (1)SO_2 derivatives could dose-dependently relax the isolated aorta rings with or without endothelium precontracted by NE, no difference was found for the rings with and without endothelium;(2)Levels of cAMP and 6-Keto(PGI_2) in isolated aortic rings were increased by SO_2 derivatives in a dose-dependent way, which were independent of endothelium;(3)SO_2 derivatives decreased cGMP levels in the rings, but not significantly; The decrease of cGMP levels was also independent of endothelium;(4)No changes of TXB_2 in rings with or without endothelium were observed;(5)Whether presence or absence of endothelium, cAMP/cGMP and 6-Keto/TXB_2 ratios were increased significantly.

结果：①SO_2衍生物对去甲肾上腺素预收缩的内皮完整和去除内皮的大鼠胸主动脉血管环均呈浓度依赖性舒张作用，且其张力变化在内皮完整与去内皮的血管环之间无显著性差异；②SO_2衍生物可引起血管组织中cAMP、6-Keto(即PGI_2)含量剂量依赖性增加，其增加程度与内皮无关；③SO_2衍生物对血管环cGMP含量呈降低趋势但在统计学上无显著意义，且对去除内皮血管无显著影响；④SO_2衍生物对去内皮或内皮完整血管环的TXB_2含量均无明显影响；⑤无论是否去除内皮，SO_2衍生物均可引起cAMP／cGMP和6-Keto／TXB_2比值显著升高。

Epoxy Floor Paint Series, cement floor paint products have: BAYDERM, in Tu,solvent-free epoxy self-leveling, low-odor solvent-Ping Tu topcoat, waterborne epoxy-Ping Tu, epoxy anti-static floor paint ( aqueous / oily), polyurethane epoxy floor paint, acrylic acid Series Paint: one-component acrylic floor paint, acrylic Weatherability Exterior Paint, Paint Stadium, cementpaint, mold bacteria and outside the wall paint.

环氧树脂系列地坪漆、水泥地板漆产品有：底涂、中涂、无溶剂环氧自流平面涂、低气味溶剂平涂面漆、水性环氧平涂、环氧防静电地坪漆，环氧聚氨酯地板漆，丙烯酸系列涂料：单组份丙烯酸地坪漆、耐候丙烯酸外墙漆、球场漆、水泥彩瓦漆、防菌防霉内外墙涂料。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。