虎红定量光度法测定乳糖酸阿奇霉素

基于乳糖酸阿奇霉素与虎红形成离子缔合物,该离子缔合物的最大吸收在波长560nm处,此处其吸光度与质量浓度呈现线性关系,提出了一种测定乳糖酸阿奇霉素的定量光度法。详细研究了该显色反应的各种影响条件,在条件优化基础上建立了乳糖酸阿奇霉素的测定方法,结果表明乳糖酸阿奇霉素质量浓度的线性范围在5.0~25.0g·L-1之间。所拟方法成功地应用于乳糖酸阿奇霉素注射剂的测定。     

海洋工程物探勘察中的干扰现象

海洋工程物探勘察中多种设备同时作业中常常遇到各种干扰现象,降低作业效率和资料质量,严重时造成作业失败、资料作废.本文将多种工程物探设备之间的干扰现象从船舶、电源、电磁和声学四方面进行分类,分别举例,分析干扰原因,针对各种类型的干扰提出了从理论和实践中总结出的的预防和解决方法,为其它作业中遭遇类似问题的处理提供理论支持和经验借鉴.     

非物质激励应用举隅--以忠良书院为例

随着中央企业员工收入差距的缩小,传统的物质激励作用逐渐弱化,文章通过对忠良书院非物质激励的应用实例介绍,提出电网企业可在沟通、信任、尊重、参与等方面加大非物质激励的力度与频度,增强员工的使命感和归属感。     

基于有限差分的二维Helmholtz方程外问题快速求解方法

针对二维Helmholtz方程外问题,基于有限差分法进行离散,提出一种有效的快速求解方法。通过傅里叶变换和LU分解方法,将离散方程简化为维数较小的界面方程,对界面方程给出了一种有效的预处理共轭梯度法。     

随机供求下农产品供应链协调模型研究

基于农产品随机供求情形,并考虑产品残值收益和缺货损失成本,研究了农产品供应商和销售商组成的二级供应链的协调问题。通过对集中控制决策和分散无协调决策时的利润分析,设计了随机供求下农产品供应链利润共享契约协调模型,在合理的利润分配参数下,供应链可以实现最优。最后,通过算例分析验证了模型的科学性和有效性。     

“管理学”教学改革探讨

结合重庆工学院的实际情况,分析了根据不同层次、不同学科、不同专业的特点开设“管理学”课程的目的和要求,并针对不同层次、不同学科和专业的特点和需要,对“管理学”课程的教学内容和方法的改革作了详细的阐述．     

玛湖凹陷与沙湾凹陷上乌尔禾组储集层差异及成因

通过薄片观察、扫描电镜分析、黏土矿物X射线衍射分析、阴极发光实验等,对准噶尔盆地玛湖凹陷和沙湾凹陷上二叠统上乌尔禾组成岩差异进行对比分析,明确了成岩产物类型和孔隙演化过程。压实作用、碳酸盐矿物胶结与沸石胶结是研究区储集层物性差异的主要控制因素,玛湖凹陷压实作用相对较弱,沙湾凹陷溶蚀作用更强。砂体成岩孔隙演化具有差异性,玛湖凹陷储集层以长石颗粒和凝灰岩岩屑溶孔为主,沙湾凹陷储集层以长石颗粒、凝灰岩岩屑以及浊沸石溶孔为主,2类储集层都少量发育原生孔隙。以上2个地区储集层的差异性主要是由成岩流体性质和岩石组分不同导致,其中,岩石组分是导致玛湖凹陷和沙湾凹陷砂砾岩储集层孔隙结构特征差异的主要原因。     

凝胶法制备Cu-BTC块体及其吸附脱除二甲基二硫醚性能

金属有机骨架材料Cu-BTC具有高孔隙率、易调控的骨架结构以及含过渡金属等特点,是吸附脱除硫化物的优异材料。采用凝胶法在常温条件下制备块状样品Cu-BTC-g,并通过X射线衍射(XRD)、扫描电子显微镜(SEM)、红外光谱(FT-IR)、拉曼光谱(Raman)、X射线光电子能谱(XPS)、N₂吸附-脱附等手段对其进行分析表征,同时测定Cu-BTC-g样品对模型硫化物二甲基二硫醚(DMDS)的静态吸附容量、吸附热力学和动力学特性。结果表明：凝胶法制备的Cu-BTC-g样品晶体平均尺寸约为0.2μm、比表面积为901 m²/g、孔体积为0.40 cm³/g,晶体尺寸、比表面积和孔体积均小于溶剂热法合成的样品Cu-BTC-s;在吸附温度298 K下,Cu-BTC-g样品的DMDS吸附容量为110.8 mg/g,比Cu-BTC-s样品提高12%。     

Operability and control in process intensification and modular design: Challenges and opportunities

In this article, the importance of considering operability and control criteria in the analysis and design of intensified and modular processes is discussed. We first analyze the impact on operability of key factors including: (i) degrees of freedom, (ii) process constraints, (iii) numbering up vs. scaling up, and (iv) dynamic/periodic operation. Comparative examples are presented to showcase the pros and cons in intensified/modular systems vs. their conventional counterparts from operability and control aspects. Then we look into metrics and tools to address these challenges such as: (i) flexibility analysis, (ii) operability-based design, and (iii) advanced model-based control. Considering different conceptual design stages as synthesis intensification, steady-state design, and dynamic operational optimization, we highlight the need to incorporate different levels of operability considerations. Future research opportunities and perspectives are also identified, particularly emphasizing the importance of a holistic strategy for integrated design, operability, and control of intensified and modular process systems.     

Oxidation resistance and thermal stability of the SiC-ZrB2 composite ceramic fibers

In this study, continuous SiC-ZrB₂ composite ceramic fibers were synthesized from a novel pre-ceramic polymer of polyzirconocenecarbosilane (PZCS) via melt spinning, electron beam cross-linking, pyrolysis, and finally sintering at 1800°C under argon. The ZrB₂ particles with an average grain size of 30.7 nm were found to be uniformly dispersed in the SiC with a mean size of 59.7 nm, as calculated using the Scherrer equation. The polycrystalline fibers exhibit dense morphologies without any obvious holes or cracks. The tensile strength of the fibers was greater than 2.0 GPa, and their elastic modulus was ~380 GPa. After oxidation at 1200°C for 1 hour, the strength of the fibers did not decrease despite a small loss of elastic modulus. Compared to the advanced commercial SiC fibers of Tyranno SA, the fibers exhibited improved high-temperature creep resistance in the temperature range 1300-1500°C.