高速弧齿锥齿轮动频计算

建立了旋转轮盘动力学模型，提出了基于刚度矩阵的离心刚度矩阵修正了模式下的动频求解有限元法，实现了弧齿锥齿传频的数值求解，数值计算与实测值基本一致且由算例得出结论，旋转效应对低阶模态，节径型振型影响较大，本算法对旋转轮盘类的动频计算具有通用性。     

Antioxidant survey to assess antagonism to redox stress using a prokaryotic and an eukaryotic system

Using a prokaryote (Escherichia coli) and a metazoa-resembling eukaryote (Ochromonas danica), we surveyed antioxidants which might overcome redox stress imposed by menadione sodium bisulphite (MD) and buthionine sulphoximine (BSO). BSO oxidant stress was evident only inO. danica; MD oxidant stress was evident in both organisms. Glutathione, its precursors, e.g. cysteine, homocysteine, and 2-oxo-4-thiazolidine carboxylic acid, and red blood cells, emerged as prime antioxidants for relieving BSO and MD oxidant stress. BSO and MD oxidant activity and antioxidant-annulling effect inO. danica were judged comparable to those found in animal cells whereas the resultsE. coli were not entirely equivalent. TheO. danica system emerged as a practical, rapid, and useful system for pinpointing oxidant stressors and antioxidants, and shows promise for studies with mammalian systems.     

(−)-Epigallocatechin gallate,a polyphenolic tea antioxidant,inhibits peroxynitritemediated formation of 8-oxodeoxyguanosine and 3-nitrotyrosine

Reaction with peroxynitrite at pH 7.4 and 37°C was found to increase the 8-oxodeoxyguanosine levels in calf thymus DNA 35-38-fold. This oxidation of deoxyguanosine, as well as the peroxynitrite-mediated nitration of tyrosine to 3-nitrotyrosine, was significantly inhibited by ascorbic acid, glutathione and (–)-epigallocatechin gallate, a polyphenolic antioxidant present in tea. For 50% inhibition of the oxidation of deoxyguanosine to 8-oxodeoxyguanosine, 1.1, 7.6 of 0.25 mM ascorbate, glutathione or (–)-epigallocatechin gallate, respectively, was required. For 50% inhibition of tyrosine nitration, the respective concentrations were 1.4, 4.6 or 0.11 mM. Thus, (–)-epigallocatechin gallate is a significantly better inhibitor of both reactions than either ascorbate or glutathione. Reaction of (–)-epigallocatechin gallate with peroxynitrite alone resulted in the formation of a number of products. Ultraviolet spectra of two of these suggest that the tea polyphenol and/or its oxidation products are nitrated by peroxynitrite.     

中药熨剂生产工艺数学模型的建立

应用一次回归正交试验法 ,对影响中药熨剂生产工艺的主要因素—加热温度、醋酸的浓度及醋淬次数进行了考察 ,得出在设计条件下的回归方程 y=73.95+ 1 .95x1 - 1 .8x2 - 2 .8x1 x2 ,并以此为数学模型 ,对熨剂生产工艺的优化区进行有效地控制     

从高放废液中去除超铀元素的TRPO流程热实验

阐述了从高放废液中去除超铀元素的ＴＲＰＯ流程热实验。热实验是用真实动力堆的 高放液进行的，取得了很好的效果。超铀元素镅、镎、钚和铀的去污系数分别大于 ３ ０００，４ ０００， ９５０和 ７ ０００。 ＴＲＰＯ流程在去除超铀元素的同时，还能去除对放射性废物长期危害起决定作用 的９９Ｔｃ。实验结果表明ＴＲＰＯ流程具有去污效率高，反萃效果好，锕系组分之间交叉污染小和试 剂成本低等诸多优点。ＴＲＰＯ流程是一个有效的从高放废液中去除超铀元素的流程。     

搭建科技人才平台提升县域科技产业竞争力

发展县域经济，促进城乡和区域协调发展，必须提升县域科技产业竞争力。搭建全省科技人才服务平台。整合全省科技人才资源，通过人才柔性流动机制，开发各项科技人才服务新业务，提供培训服务及合格科技技术经纪人。建设研发的公共平台，开放科技人才库等运作，使科技人才的力量辐射全省，为县域经济发展提供不懈动力。     

红细胞变形性及其在血液流变学研究中的意义

血液流变学在临床的应用越来越广泛,在疾病的诊断、治疗、疗效判定和预防等方面均有重要意义.其中红细胞变形性及其在血液流变学研究中的应用,越来越受到人们的重视.本文综述了红细胞及其变形性在血液流变学研究中的意义 ,旨在更好地应用于临床诊断和治疗.     

几种铈盐的热分解过程及非等温热分解动力学研究

利用TG—DTG—DTA热分析技术研究了二水合碳酸亚铈、九水合草酸亚铈、六水合硝酸亚铈三种铈盐的热分解过程．发现二水合碳酸亚铈在75-180℃下脱去2mol水生成无水碳酸亚铈，后者在220—300℃下分解脱去CO2生成CeO2；九水合草酸亚铈在100-180℃下脱去9mol水生成无水草酸亚铈，后者在290—380℃下分解并同时脱去CO和CO2生成CeO2；而六水合硝酸亚铈在60—80℃下首先脱去3．5mol水生成含2．5个结晶水的硝酸亚铈，后者在190-250℃下脱去2．5mol结晶水生成无水硝酸亚铈，在258—310℃下硝酸亚铈热分解脱去NO2和O2并生成CeO2．采用外推法研究了九水合草酸亚铈两步热分解过程的动力学，由不同升温速率下的热分析曲线及外推β→0获得了相应的固相热分解反应所遵循的分解机理及动力学参数．发现九水合草酸亚铈脱水过程遵循球形对称的三维扩散机理，即Jander方程G（α）=G（α）=[1-（1-α）^1/3]^2，动力学参数E=180．9kJ／mol、lnA=63．5s^-1；而脱CO和CO2过程遵循成核和生长机理，即Avrami-Erofeev方程G（α）=[-ln（1-α）]^1/1.5，动力学参数E=115．4kJ／mol，lnA=22．0s^-1．