关于拟凸泛函极小的部分正则性的一个注

本文给出了Acerbi—Fusco定理的一个新证明,指出证明拟凸泛函I(u,G)=f(▽u)dx,u∈W_P~1(G,E~N),P≥2,N>1极小的部分正则性可以不必利用W_P~1(G,E~N)中函数的逼近定理,也不需用到Radon测度的有关性质。     

牦牛群体血清运铁蛋白位点遗传分化的探讨

根据中国，蒙古，前苏联等３国９个牦牛地方品种（类群）血清运铁蛋白位点的基因频率，探讨了各牦牛群体的遗传分化程度，结果表明，血清运铁蛋白各等位基因频率在不同的牦牛群体中，具有明显的种群特异性，中国牦牛品种（类群）间遗传分化程度大，而蒙古牦牛品种（类群）间遗传分化程度较低，这反映了牦牛起源进化上的差异。     

一阶非线性偏差变元微分方程解的振动性

本文使用一种更为有效的方法得到了一类更为广泛的非线性偏差变元微分方程解的振动的充分条件，所得结果包含了文献［３］－［７］中的主要结果，并在很大程度上完善了［８］－［１０］的结果。本文中所出现的例子是难以由［３－１０］中的结果来处理的。     

溶剂萃取法提取衣康酸

研究了磷氧类萃取剂对稀水溶液中衣康酸的萃取行为,考察了溶剂配比、料酸浓度、操作温度等因素的影响。测定并关联了相平衡数据,证实萃合物为H_2Ita·(TBP)_2·H_2O。对于浓度约为40g/L的衣康酸发酵液,建议用50%TBP-ker为萃取剂,在室温(298 K)下萃取,反萃取用353 K热水。     

交流电动机恒功率控制探讨

本文探讨了交流异步电动机的恒功率控制．简单介绍了调节电动机转速和转矩的方法．     

Structure of the dimerized hormone-binding domain of a guanylyl-cyclase-coupled receptor

The atrial natriuretic peptide (ANP) hormone is secreted by the heart in response to an increase in blood pressure. ANP exhibits several potent anti-hypertensive actions in the kidney, adrenal gland and vascular system. These actions are induced by hormone binding extracellularly to the ANP receptor, thereby activating its intracellular guanylyl cyclase domain for the production of cyclic GMP. Here we present the crystal structure of the glycosylated dimerized hormone-binding domain of the ANP receptor at 2.0-A resolution. The monomer comprises two interconnected subdomains, each encompassing a central beta-sheet flanked by alpha-helices, and exhibits the type I periplasmic binding protein fold. Dimerization is mediated by the juxtaposition of four parallel helices, arranged two by two, which brings the two protruding carboxy termini into close relative proximity. From affinity labelling and mutagenesis studies, the ANP-binding site maps to the side of the dimer crevice and extends to near the dimer interface. A conserved chloride-binding site is located in the membrane distal domain, and we found that hormone binding is chloride dependent. These studies suggest mechanisms for hormone activation and the allostery of the ANP receptor.     

浅谈高职院校思想政治教育的创新

高校思想政治教育要克服在落实教育目标过程中的不足,要拓宽教育途径,为了做好高校思想政治教育工作,作者提出了进行观念上的创新、内容上的创新、教育方法上的创新的方法.     

高校天文教育的思考

天文学是研究宇宙中天体和天体系统的形成、结构、活动和演化的科学，在探索宇宙中的自然规律、促进其他自然学科的发展、推动技术进步、研究日地空间环境．以及在提高全民素质教育中有着不可替代的作用。作为一级学科，天文学是当代最活跃的前沿学科之一。     

Determination of the optical thickness and effective particle radius of clouds from transmitted solar radiation measurements

A method is presented for determining the optical thickness (τc) and effective particle radius (re) of stratiform cloud layers from transmitted solar radiation measurements. A detailed study shows that the cloud optical thickness and effective particle radius of water clouds can be determined from transmission function measurements at 0.75 and 2.13 μm, provided that the scaled optical thickness τ′0.75>1 and re>5 μm. The wavelengths adopted by our study are similar to the channels of the moderate resolution imaging spectrometer (MODIS). The proposed method is invalid for optically thin clouds since transmission at 2.13 μm is less sensitive to re. The retrieval errors of τ′0.75 and re monotonically decrease with increasing τc. For clouds having τ′0.75≥2, the retrieval errors of τ′0.75 and re are below 10% and 20%, respectively. Transmissions at 0.75 and 1.65 μm can also be used to retrieve τc and re.     

复变函数在换元积分法中的应用

讨论了复变函数方法在换元积分法中的应用．