Analysis of buckling deformation of positive plates during formation at low temperature

[中文文摘]在低温条件蓄电池生产中,极板化成时经常产生正极板弯曲的现象。对此进行了研究,发现在低温下,电化学反应形成了致密的结晶,很难形成颗粒状的活性物质和分布均匀的孔隙,产生的应力无法释放;低温下化成的极板内部和极板外部的成分差异很大,也是产生应力的因素之一,这些应力导致了极板的变形。[英文文摘]During battery production at low temperature, buckling phenomenon of positive plates often appeared due to the formation of plates. Research showed that electrochemical reaction formed the dense crystals at low temperature. It is difficult to form the granular active materials and uniform distributed porosity, so that the resulted stress could not be released. During formation at low temperature, the difference of components between the internal and external plates was remarkable. This was also one of the factors of resulting in stress which lead to the deformation of plates

光正交频分复用技术在光网络中的应用研究

光正交频分复用（O-OFDM）技术是目前正在研究的热点技术之一。O-OFDM技术应用在光网络中可以有效地提高系统抵抗色散及偏振模色散等效应的能力,从而改善网络的性能。文章阐述了O-OFDM技术的原理,介绍了将O-OFDM技术应用在光骨干传输网中及光接入网中的研究现状,并对该技术的发展趋势以及应用前景做出了展望

煤灰/K_2CO_3/Fe_2O_3对脱矿无烟煤燃点与燃烧速率的影响(英文)

考察了煤灰/K2CO3/Fe2O3及其之间的相互作用对酸洗无烟煤燃点和燃烧速率的影响。不同温度下制备的煤灰显示了不一样的性质(如化学组成、颜色和形貌)。脱矿无烟煤(负载和非负载催化剂)的燃烧反应性测试在热重分析仪(TGDTG)中完成,结果表明,煤灰本身对酸洗无烟煤的燃点几乎没有影响,而高温下制备的煤灰能够明显提高酸洗无烟煤的燃烧速率。当煤灰和K2CO3或者Fe2O3的混合物加入酸洗无烟煤中作为燃烧催化剂时,可以看出与单独使用K2CO3或Fe2O3相比,煤灰的加入明显导致酸洗煤的燃烧速率下降,而对其燃点影响不大。同样,K2CO3和Fe2O3之间的相互作用也能够对酸洗无烟煤的燃烧速率产生负面影响

无溶剂条件下反应控制相转移催化氯丙烯氧化制环氧氯丙烷

系统地研究了无溶剂条件下,H2O2为氧源,反应控制相转移催化剂（C16H33（70%）＋C18H37（30%））N（CH3）33PW4O16催化氯丙烯环氧化制环氧氯丙烷反应.结果表明,在氯丙烯/H2O2/催化剂（摩尔比）=400∶100∶1条件下,50～55℃反应3 h,环氧氯丙烷的收率为85～87%.在NaH2PO4存在下,催化剂循环使用5次,活性无明显降低,新鲜催化剂和回收催化剂的31P MAS NMR谱分析结果表明NaH2PO4对催化剂结构和组成具有稳定作用

一种氢醌氧化制醌的方法

本发明提供一种氢醌氧化制醌的方法，该方法包括以水为反应介质，用亚硝酸钠为催化剂，固体酸Amberlyst15为助催化剂和氧气为氧化剂，对氢醌进行氧化生成醌。该方法反应条件温和，操作简便，无有机溶剂，无金属污染少，是一种绿色环保的非金属催化氢醌氧化制醌的新方法

一种乙烯环氧化制备环氧乙烷的方法

一种乙烯环氧化制备环氧乙烷的方法，其特征是以反应控制相转移催化剂，氧化剂，溶剂和添加剂存在下，进行乙烯环氧化制备环氧乙烷，该方法乙烯在溶剂中分散均匀，使反应更加充分，添加剂的存在提高了环氧乙烷产率及环氧乙烷选择性，催化剂兼备均相和多相催化剂优点，可回收循环使用，反应条件温和适合工业应用

电石渣基CaO球团热强度的调控

提出了以电石渣制备成CaO球团,再用于生产电石的&quot;闭路钙循环&quot;技术。研究了不同种类黏结剂对Ca(OH)2基CaO球团热强度的影响,结果表明:含黏结剂B的CaO球团热强度最高,当B加入量为3%时,Ca(OH)2基CaO球团热强度为1.35MPa。根据以上规律研究了黏结剂B对电石渣基CaO球团热强度的影响,在1473K,B加入量为3%时,电石渣基CaO球团的热强度可达7.0MPa,说明黏结剂B对电石渣特殊体系具有良好的适应性。</p

醇类氧化反应中杂多酸盐催化剂的光谱研究

一种可回收循环使用的磷钨杂多酸盐（n-C16H33N（CH3）3）3PW4O16）应用于醇类的无溶剂催化氧化反应．通过IR和^31P NMR光谱对醇氧化反应前后以及反应过程中催化剂的结构变化进行表征分析，得出此催化剂为多种磷钨杂多酸盐的混合物，反应中活性中间体为含活性氧物种，多次反应-分离循环后催化剂活性会逐渐降低，催化剂的结构逐渐变为稳定的keggin结构

Masculinization of red grouper (Epinephelus akaara) induced by exogenous hormone

以每次剂量为体重的5x10-6（M/M）17α-甲基睾酮（17α-MT）投喂2~4龄赤点石斑鱼，成功地促使其提早3~4A性转变为具有生殖功能的雄性鱼。经50d投喂药饵46次，累积总剂量达到鱼体重的241.3x10-6（M/M）时，性腺中的卵巢组织萎缩，绝大部分卵母细胞已退化；精巢组织发达，间质细胞数量增多，精小囊内充满成熟精子，雄性化率达100%。实验组的流精率为93.5%。雄性化后的平均成熟系数为2.30%，与自然海区的相近似。精子寿命90MIn，活率94.6%。激素诱导的精液与催产诱导雌性鱼成熟卵子进行人工授精，受精率81.1%，胚胎发育正常，受精后23H30MIn孵出仔鱼，孵化率76.7%。证实了经外源激素诱导雄性化的赤点石斑鱼精子具有受精能力。Two to Four-year-old Females of red grouper (Epinephelus akaara ) were successFully induced to Functional males and the rate reached 100%, with oral application of 17α-methyltestosterone (17α-MT) at the dosage of 5×α10-6 (m/m ) over a 50d duration, The sex reversal ages of treated animals were 3～4 years earlier than those of the natural indlviduals.As the accumulative dosage of 17α-MT reached.241.3 × 10-6 (m/m ), it was histologically observed that ovarian tissues atrophied and most oocytes degenerated,whereas testicular tissues developed well and some seminiFerous cysts Filled with mature sperms.The number of leydig' s cells increased with the development of testicular tissues.In the experimental group semen Flowed out From 29 individuals by squeezing the belly of 31 Functionalmales.AFter masculinization the mean value of gonadosomatic index (GSI ) For the treated Fishes was 2.30%, which was the same as that For natural ones.The mean activity rate of sperms reached 94.6% and the sperm movement stopped aFter 90 minutes.ArtiFicial Fertilization was carrled out by squeezed semen Form masculinized animals and a Fertilization rate of 81.1 % was obtained.Embryonic development underwent normally and larvae began hatching by 23 hours and 30 minutes aFter insemination,with a hatching rate of 76.7%.The results of this study have solved the shortage and uncertain supply mature males in the larval rearing of the red grouper.国家自然科学基