微分方程的分离变量法及实例分析

本文主要介绍了分离变量法求解微分方程的基本方法和适用条件,并通过几个应用事例展示了其重要性和现实意义。     

淀粉-聚乙烯醇生物降解薄膜的制备研究

本文以淀粉为和聚乙烯醇(PVA)原料,采用交联共混反应制备淀粉-PVA生物降解薄膜。考察了淀粉-PVA薄膜制备过程中诸因素对薄膜各项性能和生物降解性的影响。结果表明,淀粉-PVA薄膜各项性能优良,具有生物降解性。     

Characterization of Zinc Carboxylates in an Oil Paint Test Panel

ABSTRACT

Zinc (carboxylate) soaps, formed by reactions between zinc oxide (ZnO) and fatty acids in a drying oil, are known to cause deterioration in the paint layers of modern and contemporary oil paintings. This study investigates zinc carboxylates that developed in an oil painting test panel designed to mimic the aging and degradation encountered in actual works of art. Following accelerated and natural aging, protrusions were noted on the surface of the test panel. A large protrusion with erupted gel features was extracted from the test panel, mounted in top view, and then cut to reveal the sample's cross section. The gel features, which resulted from the unreacted oil binder's separation from the paint matrix, facilitated zinc carboxylate formation. Using reflectance µ-FTIR and SEM-EDX analysis, the morphologies and spatial distributions of zinc carboxylates within the gel regions of the protrusion were studied. A concentration gradient of zinc within the gel material was observed in the cross-sectional view, indicating patterns of zinc carboxylate formation and migration.     

Interactions between mycoplasma lipid-associated membrane proteins and the host cells

Mycoplamas are a group of wall-less prokaryotes widely distributed in nature, some of which are pathogenic for humans and animals. There are many lipoproteins anchored on the outer face of the plasma membrane, called lipid-associated membrane proteins （LAMPs）. LAMPs are highly antigenic and could undergo phase and size variation, and are recognized by the innate immune system through Toll-like receptors （TLR） 2 and 6, LAMPs can modulate the immune system, and could induce immune cells apoptosis or death. In addition, they may associate with malignant transformation of host cells and are also considered to be cofactors in the progression of AIDS.     

安徽省内跨市流动人口空间分选研究

安徽省内流动人口空间分选特征,主要体现为省会优先、邻近区域优先、工资水平高的区域优先。影响流动人口空间分选的因素有自然、经济、社会因素。合肥是名副其实的人口辐合场,淮南、芜湖是次级辐合场,淮北、淮南、六安、巢湖等城市是对流场。分析安徽省人口流动空间分选基本特征与基本规律,对于准确掌握人口流动的基本信息,评估劳动力空间转换的效率具有重要作用。     

有氧运动对衰老大鼠心肌、肝脏细胞凋亡及线粒体膜电位的影响

实验研究了有氧运动对于衰老大鼠肝脏和心肌细胞凋亡以及线粒体膜电位(MMP)的影响。结果显示:老年对照组(A组)心肌、肝脏细胞凋亡比率高于青年对照组(Y组),而A组心肌、肝脏MMP低于Y组。老年运动组(AE组)心肌、肝脏细胞凋亡比率均低于A组,并且其心肌MMP高于A组。结果提示,有氧运动可有效减少衰老造成的心肌和肝脏细胞过度凋亡。有氧运动维持心肌线粒体正常MMP的作用可能是其减少心肌细胞过度凋亡的机制之一。     

水合物法分离H2+C2H4气体混合物相平衡实验研究

采用水合物吸收法,以THF为吸收剂,进行了吸收法分离(H2 C2H4)气体混合物的相平衡实验研究。结果表明,采用THF做吸收剂可望获得很好的(H2 C2H4)气体混合物吸收分离效果。     

“脱编”背景下高校教师司法救济的 现状、问题及原因探究 ——基于160起民事诉讼案件的分析

在高校教师脱离事业编制的时代背景下，高校教师司法救济案件呈现数量上升、地域分布与省市高校数量部分关联、争议类型复杂多样、判决情况多为高校胜诉、适用法律广泛的现状，出现同案不同受、同案不同法、同案不同判等问题。这主要是因为现行法律的不完善与新制度的持续推进发生耦合作用，放大了高校教师司法救济的不足。在新时代背景下，需要贴合制度转型，从价值引领、身份定位、权利保障、程序公平等方面完善高校教师司法救济。     

城市河道黑臭水体综合治理工程实例分析

针对某市河道黑臭水体的特性及污染物特点,采用"膜生物反应器(MBR)一体化工艺、补氧+生物膜、人工清淤"综合治理技术对其进行治理。实际治理结果表明,MBR一体化工艺出水水质达到了《城市污水再生利用景观环境用水水质》(GB/T18921-2019)的要求;补氧与生物膜的组合应用最大程度地消除了黑臭现象;采用人工清淤方式对河床内淤泥进行了全部清除,消除了内源污染;工程运行费用为70.39万元/年。该综合治理技术治理河道黑臭水体效果良好,适合在其他类似项目中推广应用。     

神话自然观与中西体育文化差异

中西神话自然观存在着＂天人合一＂与＂天人二分＂的差异,而这种差异源于中西方对＂人＂与＂自然＂地位的不同感受。神话自然观的差异通过作用于原初形态和思维方式,对中西体育文化产生着深刻的影响。