人类舌运动类型

介绍了舌运动类型的研究历史和研究成果及5种舌运动类型（卷舌、叠舌、翻舌、三叶舌、尖舌）在不同人群中的出现率，着重论述了近年来我国学者这方面的工作。     

脱氢醋酸的合成与结构表征

研究了以乙酰乙酸乙酯为原料合成脱氢醋酸过程中，催化剂的种类、用量以及反应时间对产物得率的影响。结果表明，当采用碳酸氢钠为催化剂，反应物中催化剂的质量分数为0.2%，反应时间为4h，产物得率最高，达82.4%。对所合成的产物通过IR、^1HNMR、^13CNMR和MS分析，表征了其分子结构。     

逆变器预置开关角误差对输出谐波的影响

针对数字控制技术的特点，分析了在选择性谐波消除法的理论计算结果与实际开关角数字控制结果出现偏差时，对逆变器输出电压谐波含量的影响。并研究了开关角数量对逆变器性能的影响，结果表明：开关角控制误差对逆变器输出谐波有一定影响，但可以在计算时修正；而开关角数量的增加有利于减小电流脉动，提高输出电压质量，但开关频率随之增加。     

高热稳定性富钕铁硼永磁体研究

研究了廉价高热稳定性富钕混合稀土永磁合金。选择价廉的富钕混合稀土制备永磁体,通过合金元素钴和钼的复合加入,提高了磁体的使用温度。对于MR_(34)Co_(14)Fe_(49.9)Mo_(1.0)B_(1.1)磁体,其性能达到:_iH_c=1 020kA/m,_bH_c=860 kA/m,B_r=1.14 T,(BH)_(max)=240 kJ/m~3,a_(20-150℃)=-0.07％/℃,T_c=485℃,W_(ir)<6％。并研究了永磁体的微观结构。     

HYNC-50D场效应管电火花脉冲电源

场效应管电火花脉冲电源,利用电流前沿斜率控制,实现了高效率低损耗放电加工模具,从而提高了模具的仿真度。电压控制型功率器件,利用场效应管实现了窄脉宽高峰值电流放电加工模具,取得了模具最佳加工表面粗糙度和提高去除率的统一。采用单片机和主振级两套脉冲发生器,进一步提高了电火花脉冲电源的可靠性和电火花机床的利用率。     

Hubbard模型的holon涨落和铁磁相变

从Zou-Anderson有效哈密顿量出发,考虑holon涨落效应,导出一铁磁相互作用。用RPA计算Spinon静态磁化率,在T=0及U=∞情形,求出当掺杂δ>δc≈0.55时,铁磁相不稳定。     

芳硫基乙酸酯及其氧化产物的色谱行为 Ⅱ.在高效液相色谱中的行为

用硅胶作固定相,以与 TLC 相同的溶剂系统作流动相,芳硫基乙酸酯及其氧化产物的 HPLC 行为和 TLC 行为具有一致性。影响液固色谱保留值的因素包括取代基团的极性强度和数目,取代位置不同而引起的基团之间的相互作用和空间位阻等.     

区域性地下水系统动态识别方法及其应用（Ⅱ）

本文承接上文［１］将区域性地下水系统动态识别方法应用于阳泉市深层溶水系统的参数识别，与以往人们常用的静态识别方法相比较证明，动态识别法比静态识别法具有更高的精确度，所得参数更符合实际。     

Organotin complexes of pyridine-2-carbothioamide

Summary Complexes of pyridine-2-carbothioamide with diethyltin dichloride, dibenzyltin dichloride and phenyltin trichloride are described. In each case, the chelating agent is bound to the tin(IV) atom by the pyridine nitrogen and the carbothioamide sulphur, giving support to proposals that certain organotin compounds cause enzyme deactivation via the formation of tin-sulphur bonds.Acknowledgment. We thank the Tin Industry (Research and Development) Board, Kuala Lumpur, for financial support.     

Serial nuclear transfer improves the development of interspecies reconstructed giant panda (Aluropoda melanoleuca) embryos

Interspecies somatic nuclear transfer (NT) may provide a new approach for preservation of the endangered rare species. Previous interspecies cloning studies have shown that a nucleus from a quiescent somatic cell supports early development of reconstructed embryos in the ooplasm from another species. In this study, we transferred nonquiescent somatic cells from a giant panda into the perivitelline space of the enucleated rabbit oocytes. After electrofusion (at the rate of 71.6%) and electrical activation, 4.2% of the panda-rabbit reconstructed embryos developed to blastocyst in vitro. For improving the development rate of reconstructed embryos, we used serial NT in this study, i.e. blastomeres from reconstructed morulae were transferred into the perivitelline space of the enucleated rabbit oocytes. The fusion rates in the groups of serial I, serial II and serial III were 79.5%, 84.1% and 78.0%, respectively, having no difference with that of somatic group. And the blastocyst rates in serial NT groups were 19.4%, 13.5% and 10.3%, respectively, which are significantly higher than that in somatic NT group. These results indicate that the nuclei from nonquiescent somatic cells can support early development of reconstructed embryos and serial NT can improve the development rate of interspecies reconstructed embryos. These authors contributed equally to this work.