Impact Responses of Prismatic Lithium-Ion Battery Based on the Membrane Factor Method北大核心CSCD

Aimed at the internal short circuit problem due to large deformation of the prismatic lithium-ion battery cell under impact loadings, a simplified battery model was first established. Then the motion equations of velocity and displacement based on the membrane factor method were proposed. With the effects of the face-sheet thickness and the densification region on the normalized final deflection, impact response characteristics of prismatic battery cells were investigated in detail. The results show that, the improved motion equations involving the membrane factor can reflect the dynamic response mechanisms of the prismatic battery cell under impact loadings, and the large deflection under high-speed impact can be predicted. With the increase of the face-sheet thickness, the deflection of the battery cell’s lower part decreases obviously. However, the densification region expands with the face-sheet thickness. The deflection and the densification region of the cell’s lower part both increase with the inner core density of the battery. This proposed impact model provides a theoretical guidance for the multi-functional integrated dynamic design of prismatic battery cells. © 2022 Editorial Office of Applied Mathematics and Mechanics. All rights reserved.     

草鱼和团头鲂的核型及其C带带型的研究

采用用血淋巴细胞培养制备染色体和BSG 显带枝术,研究了草鱼和团头鲂的核型和C 带带型,草鱼、团头鲂都是2n=48,均有8对中部着丝点染色体,10对亚中着丝点和6对亚端着丝点染色体,它们在核型中除第9对染色体短臂有显著差异外,其余染色体形态很为相似,在C 带带型中,大多数染色体都具着丝点C 带,但它们各有特殊的带型,差异较大,草鱼有两对不同圆颗粒状带型亚中着丝点C 带染色体,并有6对短臂全深染的端位型亚端着丝点C 带染色体,还有两对在短臂C带与随体相联的染色体.团头鲂有的在同源染色体长臂间显示对称和不对称的两种插入型C 带,次缢痕位于第9对染色体短臂上,亦为C 带染色阳性,位于缢痕的裂隙内,无端位带,并对草鱼和团头鲂不同亚科的核型特征以及它们染色体与其物种进化的关系进行了初步讨论.     

印度黄脊蝗核型和C－带的研究

本文研究了印度黄脊蝗（ｐａｔａｎｇａＳｕｃｃｉｎｃｔａＪｏｈａｎｓｓｏｎ）的染色体组型和Ｃ－带。结果表明：印度黄脊蝗的染色体数目：２ｎ（）＝２２＋ｘ０＝２３,全部为端着丝粒染色体,ＮＦ＝２３;核型公式：２ｎ（）＝２ｘ＝２３ｔ;中期染色体绝对长度总和为７１．４７±０．６３μｍ;所有染色体都具有着丝粒Ｃ－带,异染色质总量为１８．７６±０．１１％;染色体组中最长与最短染色体之比为４．４：１,臂比大于２：１的染色体比例为零,印度黄脊蝗的核型属“ＩＣ”核型。     

比格犬柯萨奇病毒感染的报道

柯萨奇Ｂ组病毒（ＣｏｘｓａｃｋｉｅＢＶｉｒｕｓｅｓＣＢＶ）是一种人兽共患病毒。ＣＢＶ引起神经系统病变时人与比格犬所表现的症状基本相似。ＣＢＶ可引起全身性疾病,损伤多系统。应注意早期的诊断和治疗。ＣＢＶ并非终生免疫,应注意再次感染     

利用初等行变换求极大无关组的一些条件

本文讨论利用初等行变换求行向量组的极大线性无关组的方法,澄清一些线性代数教学用书中存在的一种模糊认识,并给出修正后的方法。     

PPV导电高分子膜可充电电池的特性研究

对导电高分子—聚对苯撑乙烯基ｐｏｌｙ－（ｐａｒａ－ｐｈｅｎｙｌｅｎｅｖｉｎｙｌｅｎｅ）（简称ＰＰＶ）膜电极和锂电极所组成的超薄型可充电电池的安装及反应机理进行研究,并对此电池特性作了深入的探讨．     

中国豹蛛属雾豹蛛组研究及一新种再记述(蜘蛛目:狼蛛科)

雾豹蛛组ＧｒｏｕｐＮｅｂｕｌｏｓａ是狼蛛科Ｌｙｃｏｓｉｄａｅ,豹蛛属Ｐａｒｄｏｓａ的分组．本文描述该组５种豹蛛,包括１新种记述,侧重在有鉴别价值的生殖器管,尤其是雄性生殖球的中突ｍｅ－ｄｉａｎａｐｏｐｈｙｓｉｓ．１．大别豹蛛Ｐ．ｄａｂｉｅｎｓｉｓＣｈａｉｅｔＹａｎｇｓｐ．ｎｏｖ．＊２．查普林豹蛛Ｐ．ｃｈａｐｉｎｉ（Ｆｏｘ,１９３５）,３．东方豹蛛Ｐ．ｏｒｉｅｎｓ（Ｃｈａｎｂｅｒｌｉｎ,１９２４）,４．苏门答腊豹蛛Ｐ．ｓｏｍａｔｒａｎａ（Ｔｈｅｒｅｌ,１８９２）,５．雾豹蛛Ｐ．ｎｅｂｕｌｏｓａ（Ｔｈｅｒｅｌ,１８７２）．     

异精激发彭泽卿雌核发育后代染色体组型的研究

利用活体注射ＰＨＡ法对彭泽鲫及彭泽鲫在不同外源精子刺激形成的子一代进行染色体组型分析,结果表明：彭泽鲫具１６６条染色体,核型组成是１８对中部,１７对亚中部、６对亚端部、４２对端部着丝点染色体。     

层状LiMnO2的固相合成及电化学性能

以Mn₂O₃和氢氧化锂为原料，通过焙烧合成出o-LiMnO₂。用X射线衍射和扫描电镜对不同温度下合成的粉末样品进行了表征，并研究了材料的电化学性能。通过对不同温度条件下烧结样品的晶胞参数、布拉格(110)晶面峰半高宽及电化学性能研究发现：600 ℃下合成样品的半高宽最大，堆垛层错率高，同时电化学性能也最好，首次放电容量达到156 mAh·g^-1，20次循环后仍保持在140 mAh·g^-1以上。中高温固相合成的o-LiMnO₂材料，在晶粒范围大小相近时，材料电化学性能与材料堆垛层错率相关。     

锂离子电池负极合金CoSn和Cu-Sn的制备与表征

CoSn alloy and Cu-Sn samples were synthesized by H₂-reduction following solid-state reaction between Co(Ⅱ)， Cu(Ⅱ)， Sn(Ⅳ) and NaOH at ambient temperature. The samples were characterized by XRD， SEM. The results showed that CoSn alloy (80～200nm) is globe-shaped， ultrafine hexagonal material， and Cu-Sn alloy powder consists of two phases， i.e. Cu₆Sn₅ and Cu₃Sn. Cu-Sn powder has spherical morphology and the particle size is estimated to be 60～70nm. The electrochemical performances of CoSn alloy and Cu-Sn powder were studied using lithium-ions model cell Li/LiPF₆ (EC+DMC)/CoSn (or Cu-Sn). It was demonstrated the reversible discharge capacities for 10 cycles keep above 280mAh·g^-1 for nanophase Cu-Sn， and 60mAh·g^-1 for CoSn alloy. Differ-ential capacity plots showed that the reaction mechanisms of Cu-Sn with lithium were reversible.