仪器分析教学软件的设计与研制

设计与研制了仪器分析的新教学软件 ,采用积件的设计思想 ,按照软件重用的原则 ,建立了组合平台和积件库 ,实现了编辑生成课件的备课功能与多媒体软件授课功能间的同步协调。对现代教育技术的应用及新型教学软件的构建进行了探索     

学术期刊学者型编辑的研究方向及发展路径

针对编辑专业发展面临的学术研究瓶颈问题,探讨学术期刊编辑可以选择的研究方向及发展路径。结合学术期刊编辑的工作及自身学术发展的经历,从选择研究方向、开展学术研究、开启学术生涯等方面介绍努力发展成为学者型编辑的路径。学术期刊编辑可以结合自身服务的学术领域选择“科研论文写作”“科学研究方法”“薄弱研究主题”等作为研究方向,实现发展成为学者型编辑的目标。学者型编辑的发展与期刊的发展是相辅相成、密不可分的,学者型编辑可以促进学术期刊的发展,学术期刊也可以滋养编辑的发展。     

告作者

正为适应我国信息化建设需要,实现科技期刊编辑、出版、发行工作的电子化,推进科技信息交流网络化的进程,扩大作者学术交流渠道,本刊已加入《中国学术期刊(光盘版)》,"中国期刊网",超星"域出版","万方数据——数字化期刊群","中教数据"和博看网等出版平台。作者著作权使用费与本刊稿酬一次性给付。如作者不同意将文章编入该数据库,请在来稿时声明,     

基于网络教育的有机化学课程教学方法与教学手段的改革探索与实践

随着现代远程教育的发展,网络课程成为传授知识的重要平台。网络环境下教学方法的改革,是提高网络教育教学质量的关键。本文主要针对网络教学环境下的教学方法和教学手段进行改革探索与实践,充分体现自主学习的教学理念。     

告作者

正为适应我国信息化建设需要,实现科技期刊编辑、出版、发行工作的电子化,推进科技信息交流网络化的进程,扩大作者学术交流渠道,本刊已加入《中国学术期刊(光盘版)》,"中国期刊网",超星"域出版","万方数据——数字化期刊群","中教数据"和博看网等出版平台。作者著作权使用费与本刊稿酬一次性给付。如作者不同意将文章编入该数据库,请在来稿时声明,本刊将作适当处理。     

青岛土壤环境腐蚀国家野外科学观测站通过验收

正"青岛土壤腐蚀试验站建设及数据积累"专项暨"青岛土壤环境腐蚀国家野外科学观测站"示范站顺利通过了由国家材料环境腐蚀平台组织的专家验收。专家组由7位长期从事环境腐蚀的专家组成,国家材料环境腐蚀平台主任李晓刚任组长。     

青岛土壤环境腐蚀国家野外科学观测站通过验收等

“青岛土壤腐蚀试验站建设及数据积累”专项暨“青岛土壤环境腐蚀国家野外科学观测站”示范站顺利通过了由国家材料环境腐蚀平台组织的专家验收。专家组由7位长期从事环境腐蚀的专家组成,国家材料环境腐蚀平台主任李晓刚任组长。     

移动增强现实技术在高校有机化学分子结构教学中的应用——芳香烃化学性质的翻转课堂教学设计与实施

针对高校有机化学翻转课堂教学,设计了采用移动增强现实等技术的有机化学辅助教学平台。该系统可与教材配套使用,包括供学生以AR模式观察化合物分子、浏览各类教学资源的移动客户端以及供教师编辑教材知识体系、上传模型和多媒体资源的PC客户端。将该系统应用于芳烃化学性质翻转课堂教学,从成绩对比、问卷调查和学生访谈等3方面研究了其教学效果。结果表明:该系统的使用对提升学生的学习兴趣具有一定的积极作用,在翻转课堂教学中取得较好的教学效果,为高校同类型课程的教学改革设计与实施提供了示范与参考。     

化学网络课程有效实施的课程观及教学策略

网络环境下教学过程各要素的角色、地位、作用发生了很大变化,必将引起课程和课堂的重构、引起“教”与“学”理念和方式的变革。本文探索新课程改革中构建有新意但又不脱离现实基础、具有个性化的化学网络课程,为学习方式的变革提供学习资源平台、教学管理平台和交互平台。并探讨化学网络课程的开发和实施中教师应有的课程观和教学策略,解决网络课程实施的有效性问题,体现以学生为本的教育价值观和体现学生个性发展的课程和教学目标。     

中德土壤与环境联合实验室成立

由中德科学中心资助的中德土壤与环境联合实验室于2003年11月8日在中国科学院南京土壤研究所正式成立。 中科院南京土壤研究所的有关负责人介绍,成立后的中德土壤与环境联合实验室将致力于构建一个开放式平台,加强中德两国士壤研究机构科学家之间的学本交流和合作研究,建立中德关于“土壤与环境”等领域的合作研究网络。 其具体目标包括:每年资助一定数量的中德科学家进行     

Separation and quantification of paraquat and diquat in serum and urine by capillary electrophoresis

The use of capillary electrophoresis (CE) for simultaneous qualitative and quantitative detection of paraquat (PQ) and diquat (DQ) in both serum and urine was investigated. The two herbicides were extracted from biological fluids with liquefied phenol. Serum required a deproteinization with chloroform and ammonium sulfate as pretreatment. The extracts were hydrodynamically injected and the complete separation was carried out in 10 min, using a capillary tube (75 microm i.d., 500 mm) of fused silica containing 50 mM phosphate buffer (pH 2.50) as the carrier. UV absorbance detection at 200 nm was performed by an on-column detector. The analytes were characterized by their respective migration times. Analytical recoveries were 52.6% for PQ and 62.6% for DQ in serum, and 71.4% and 59.3%, respectively, in urine. The linearity was studied up to 4 mg/L and the limits of detection (LODs) were better than 5 pg/mL in serum or urine. The CE method described was applied to the characterization of two lethal poisonings and results were related.     

Defect of nanocrystalline copper and silver

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聚氨酯/苯丙杂化乳液的合成、表征和特性及其在复膜胶中的应用

由聚氨酯(PU)预聚物、丙烯酸丁酯和苯乙烯单体的乳液聚合制备了聚氨酯-苯乙烯-丙烯酸酯(PUSA)杂化乳液,1H NMR显示所得的PU预聚物由烯烃基团封端。 TEM表明,其粒径约为150 nm,且为颜色深浅不同的两部分所组成。 随着PU含量的降低,杂化乳液的热稳定性增加。 DSC分析表明,所得杂化乳液有单一的Tg值,且处于聚氨酯和聚苯丙(PSA)乳液Tg值的中间。 当将得到的杂化乳液用于纸塑和塑塑复合时,其剥离强度分别为14.1 N/2.5 cm和12.2 N/2.5 cm。     

Synthesis and characterization of amphiphilic star copolymer of beta-cyclodextrin and polypropylene oxide and their application as nanocarriers

The present study was aimed at synthesizing and characterizing star copolymers of ??-cyclodextrin and exploring their application as nanocarriers. The copolymers of ??-cyclodextrin and polypropylene oxide were synthesized by using ring opening polymerization, catalyzed by base, under high temperature and pressure. The polymers of different molecular weight were synthesized by increasing chain length of polypropylene oxide at optimized temperature, pressure and concentration of catalyst. The structure of synthesized polymer was confirmed by IR and NMR. Molecular weight and molecular weight distribution was evaluated by hydroxyl number and gel permeation chromatography respectively. Amphiphilic nature of the polymers was evaluated by determining the solubility in water and different organic solvents. For the evaluation of polymer as a nanocarrier, Ibuprofen was selected as model drug. Loading efficiency and release of Ibuprofen from the complex were also investigated. It was observed that, with increase in the molecular weight of the polymers, loading capacity was increased.     

Synthesis of colloids and films of Pr, Er and Yb with nonaqueous solvents

Colloidal dispersions of Yb, Er and Pr have been prepared by chemical liquid deposition. The metals were cocondensed at 77 K with 2-methoxyethanol and ethanol to produce solvated metal atoms. The particle size of the dispersions was determined by transmission electron microscopy to range from 52 to 1080 Å; the particles had spherical shapes. After solvent evaporation under vacuum, active solids and amorphous powder were deposited over Cu and Al metal. Dispersion stability, particle size, UV/Vis absorption and zeta potential were studied. The solids prepared by solvent evaporation were characterized by Fourier transform infrared (FTIR) spectroscopy and thermogravimetric analysis (TGA). The films prepared on Al were studied by scanning electron microscopy. The most stable colloid was obtained using 2-methoxyethanol: several concentrations were stable for several months and the zeta potential indicated that this colloid stability is mainly due to solvation effects. FTIR spectroscopy of the solids indicated solvent incorporation in the film. This observation was corroborated by thermal analysis. Information on the thermal stability of the films was obtained by TGA. The UV/Vis absorption spectrum was measured at several concentrations under different conditions.     

丝胶-甲基丙烯酸甲酯接枝共聚物的合成与表征

在酸性水介质中,以硝酸铈铵为引发剂合成了丝胶-甲基丙烯酸甲酯接枝共聚物,其结构经1H NMR,IR,SEM和GPC表征。用正交试验法考察了各因素对接枝共聚反应的影响,结果表明,单体浓度对接枝聚合反应的影响最大,反应时间的影响最小。     

理化实验室的设计与建设

以某新建理化实验室为例,阐述了实验室的建设过程,指出了建设理化实验室的设计思想和遵循原则：介绍了普通理化实验室设计与建设过程中必备的功能区域及基本要求;从电力系统、通风系统、供排水和供排气系统几方面探讨了筹建理化实验室的设计思想,强调了合理规划设计对实验室长期可靠运行的重要性。     

毛细管电泳分离测定碘海醇及其杂质

 对新型造影试剂碘海醇及其杂质进行了分离和测 定研究。以硼酸盐为缓冲体系,使中性的多元醇类物质碘海醇及其杂质通过络合反应而带负 电,加入十六烷基三甲基溴化铵反转电渗流以加快分析速度,再加入适量异丙醇以进一步改 善分离结果。对该方法的定量线性范围和重现性进行了考察,将分离结果与用HPLC测定的结 果进行了比较。     

Electron beam modification and crosslinking: Influence of nitrile and carboxyl contents and level of unsaturation on structure and properties of nitrile rubber

The structural changes of nitrile rubber with varying nitrile contents, hydrogenated nitrile rubber and carboxylated nitrile rubber in the presence and absence of a polyfunctional monomer, namely trimethylolpropane triacrylate, at different doses of electron beam irradiation, were investigated with the help of FTIR spectroscopy (in the attenuated total reflectance mode), dynamic mechanical thermal analysis and sol–gel analysis. Solid-state NMR with gated high power decoupling technique was used to understand the mechanism of crosslinking of the irradiated samples. The allylic radicals generated in the butadiene chains react to form intermolecular crosslinkages. There was a significant decrease in the concentration of olefinic groups for the nitrile rubber on irradiation. This was also affirmed by the increase in the carbon resonances due to C–C linkages from the NMR technique, indicating more crosslinkages. The spectroscopic crosslink densities were determined and the results were compared with the swelling measurements. The variation in the crosslink clustering for rubbers with different acrylonitrile contents was explained using the NMR technique. The increase in crosslinking was also revealed by the increase in the percent gel content and dynamic storage moduli with radiation doses. The lifetime of spurs formed and the critical dose, an important criterion for overlapping of spurs, were determined for both the grafted and the ungrafted nitrile rubbers of different grades and compared using a mathematical model. The ratio of scissioning to crosslinking for nitrile rubber was determined using Charlesby–Pinner equation. The mechanical properties had also been studied for both the modified and the unmodified systems.     

Simultaneous analysis of citrulline and arginine in serum and tissue

We developed a method for simultaneously determining l-citrulline and l-arginine levels in serum and tissue samples using RP-HPLC with ultraviolet (UV) detection. The serum was deproteinized by trichloroacetic acid and heat; the tissue was homogenized by trichloroacetic acid and deproteinized as the same as serum. Phenyl-isothiocyanate (PITC) solution was used as derivatization reagent and a gradient elution was carried out. The linearity for l-arginine and l-citrulline ranged from 0 to at least 1000 μmol/L. R² values were above 0.9999 for both. LODs for l-arginine and l-citrulline were 0.0462 μmol/L and 0.0195 μmol/L, respectively, while LOQs were 0.530 μmol/L and 0.417 μmol/L, respectively. Intra- and inter-day CVs were less than 3.5% and 7.5% in serum, respectively. The average recovery was from 85.5% to 116.5% in serum. Intra-assay CVs were 3.8% and 10.3%, and inter-assay CVs were 13.7% and 10.7% for l-arginine and l-citrulline respectively in tissue. The average recovery was from 92.8% to 113.5% in tissue. This is a reliable and convenient analytical method which is suitable for most clinical laboratories.