大型软包锂离子电池的热物性实验研究

针对大型软包锂离子电池热物性参数的测定问题,提出适用于该型电池的热参数表征方法. 基于准稳态导热原理,建立电池的传热理论模型. 开展实验研究电池的比定压热容和导热系数与温度的依变关系,分析热损对测试结果的影响,对测试方法的有效性进行验证. 结果表明,电池比定压热容随着温度的升高而线性增大,导热系数受温度的影响较小. 在900 s内可以测得电池热参数在10~60 °C下的变化状况,实验验证结果显示测算精度高于92.3%,具有测算周期短、准确度高和测试灵活等优势.     

X射线透射成像技术原位追踪混凝土吸水过程

为了表征二维混凝土的传输过程,制备厚度为1 mm的混凝土薄片. 采用X射线透射成像（TXR）技术,联合扫描电镜、背散射和能谱分析技术（SEM/BSE/EDS）原位追踪水在2维混凝土薄片中的毛细自吸过程. 测试不同质量分数CsCl溶液对X射线透射图像的增强效果. 结果表明,CsCl能够提高吸水过程中混凝土薄片的TXR图像对比度,使得水在混凝土中的渗流路径更清晰、可辨. 水泥浆体在吸收CsCl后,扫描电子背散射图像的对比度显著增强. 不同位置铯原子的EDS能谱结果验证了TXR技术确定吸水前锋位置的准确性.     

COSMO-SAC法筛选环戊烷/新己烷分离萃取剂及过程模拟

利用COSMO-SAC溶剂化模型,计算了无限稀释条件下,几种常见卤代烷烃、环烷醇对环戊烷和新己烷的分离选择性.结果表明,三氯丙烷的表面屏蔽电荷主要在非极性区域分布,同时具有一定的氢键供体能力,展现出对环戊烷和新己烷较好的理论分离能力.将其COSMO-SAC模型参数带入AspenPlus软件,对三氯丙烷萃取精馏分离环戊烷...     

99Tcm标记糖肽及其在荷瘤小鼠体内的分布与代谢动力学

Glucose and galactose are conjugated to the N- mercaptoacetyl-Val-Gly-Gly (MAVGG). The glycopeptides and MAVGG are labeled with 99Tcm. The partition coefficients between octanol and water (Pow) are measured. Glycopeptides or MAVGG labeled with 99Tcm areinjected into the mice bearing S180 tumor. 10μL blood samples are withdrawn at different time points and the radioactivities are counted to calculate the effective halflife (T1/2) using a bi-exponential fit. Biodistribution is measured at 3 h postinjection and the percentage of injected dose per gram ( ID%/g ) and tumor to normal tissue ratio (T/NT) were calculated. The assigned structures were confirmed on the basis of IR, NMR and MS. The 99Tcm labeling yield 巨radiochemical purity is greater than 90%. The lgPow of 99Tcm-Glu-MAVGG, 99Tcm-Gal-MAVGG and 99Tcm-MAVGG are –1.974, –2.128 and –1.378, respectively. The T1/2αof the three labeled peptides are 24.3, 37.1, 46.3 min and T1/2β are 221.5, 158.4 and 198.4 min, respectively. The tumor uptakes at 3 h postinjection are 1.46, 1.55 and 0.67 for 99Tcm-Glu-MAVGG, 99Tcm-Gal-MAVGG and 99Tcm-MAVGG, respectively. Their T/NT for tumor over muscle are 3.74、7.38 and 3.53, respectively. The results demonstrated that after carbohydrate conjugate of peptides, the lipophilicity is decreased , the blood clearance is increased and the tumor uptake is enhanced. Of the two glucopeptides, 99Tcm-Gal-MAVGG shows faster blood clearance, higher tumor uptake and T/NT, which suggests the potential utility of 99Tcm-Gal-MAVGG as a suitable tumor imaging agent.     

传统文化与流行文化在思想道德修养与法律基础课中的应用

思想道德修养与法律基础课是对大学生进行思想道德和法律教育的主渠道。为应对思想价值观念多元化对该课程的政治功能和教育功能带来的冲击,提高其教学的针对性和实效性,应重视流行文化的积极影响和传统文化的基本精神的完美结合,深入分析其教学地位和传统文化、流行文化的内涵,探讨传统文化与流行文化的育人功能,着力在教学内容、教学方式、教学理念方面深化改革,从而提升大学生的人文综合素养。     

太阳能跨季节储热耦合热泵系统性能影响因素分析

通过建立太阳能跨季节储热耦合热泵系统物理模型和非稳态传热数学模型,利用VisualBasic软件对太阳能跨季节储热耦合热泵系统性能进行了仿真模拟,并对集热器循环水泵启动温度、储热时间段、水箱容积与集热器面积比(V/A)和地下储热循环水泵启动温度等因素对系统性能的影响进行了模拟计算与分析.研究结果表明,在进行太阳能跨季节储热耦合热泵系统设计和系统运行性能分析时,需要综合考虑上述因素的优化配置,以此才能保证系统运行可靠、经济和节能.     

几种图像变换算法性能比较

为寻找提高图像压缩算法性能的途径,比较了二维DCT（Discrete Cosine Transform）变换,二维张量积小波变换以及最新的几何小波的变换特点及实用效果。针对同一图像采用不同的几何小波进行分解,保留相同个数的显著系数进行图像重建,以比较各种小波基的稀疏表示能力。结果显示,在高压缩比条件下,Ban-delet和DCT变换更加有效,而在高质量条件下,小波变换依旧是最有效的工具。     

徐沛快速通道下伏煤层采空区稳定性分析与评价

徐沛快速通道路线先后穿越王庄、垞城、马坡等煤矿采煤塌陷区.为了保证道路和桥梁的运营安全,项目组对沿线煤层采空区展开了详细的勘测调查.以垞城煤矿采空区为例,对采空区的空间特性,岩层的移动、变形与破坏规律,进行了分析与评价.研究结果表明:垞城煤矿采空区是稳定区,即采空区残余变形量小于公路规范的规定,其变形量不会导致公路损坏.     

×Synergistic action of non-solvent induced phase separation in preparation of poly（vinyl butyral） hollow fiber membrane via thermally induced phase separation

A systematic study of air gap distance effects on the structure and properties of poly（vinyl butyral） hollow fiber membrane via thermally induced phase separation （TIPS） has been carried out. The results show that the hollow fiber membrane prepared at air gap zero has no skin layer; the pore size near the outer surface is larger than that near the inner surface; and the special pore channel-like structure near the outer surface is formed, which is quite different with the typical sponge-like structure caused by TIPS and the finger-like structure caused by non-solvent induced phase separation （NIPS）, because of the synergistic action of non-solvent induced phase separation at air gap zero. The pore size gradually decreases from outer surface layer to the intermediate layer, but increases gradually from intermediate layer to the inner surface layer. With the increase of air gap distance, the pore size near the outer surface gets smaller and a dense skin layer is formed, and the pore size gradually increases from the outer surface layer to the inner surface layer. Water permeability of the hollow fiber membrane decreases with air gap distance, the water permeability decreases sharply from 45.50× 10^-7 to 4.52× 10^-7 m^3/（m^2-s.kPa） as air gap increases from 0 to 10 mm at take-up speed of 0.236 m/s, further decreases from 4.52×10^-7 to 1.00×10 ^-8m^3/（m^2.s·kPa） as the air gap increases from 10 to 40 mm. Both the breaking strength and the elongation increase with the increase of air gap distance. The breaking strength increases from 2.25 MPa to 4.19 MPa and the elongation increases from 33.9% to 132.6% as air gap increases from 0 mm to 40 mm at take-up speed 0.236 m/s.     

公路交通工程设施基本信息量分析方法

为了定量分析公路交通工程设施的效能,为交通工程设施设计和设置更加合理提供理论依据,为道路交通管理部门、交通法规与标准制定部门提供有益的借鉴和参考,本文以定量论证为主,定性分析为辅,在分析国内外相关研究成果的基础上,提出了公路交通工程设施传递信息量、互信息量、信息熵等概念,并根据交通工程设施基本构成要素,从八类信息(中文、英文、阿拉伯数字、几何形状、颜色、指向、图及特征符号及线形设施等)的角度构建了公路交通工程设施基本信息量(未区分不同类信息的权重)计算模型,为分析单位公路空间驾驶人所获得的理论信息量,提出了公路交通工程设施传递信息密度概念,并对所构建的模型进行了实例分析.本文的研究内容对提高公路交通系统服务能力、运行效率和安全水平具有一定的理论意义和实用价值.