荷移分光光度法测定醋酸氯己定

通过醋酸氯己定与红紫素的荷移反应来测定制剂中醋酸氯己定的含量,是利用分光光度法进行测定的。反应在乙醇-丙酮介质中进行,反应物的最大吸收波长为545 mn,表观摩尔吸光系数为1.54×10~4 L·mol-1·cm-1,相对标准偏差为0.89％(n=6),药物浓度在0-45 mg·L-1范围内呈线性关系;此方法简便易行,条件易于控制,灵敏度高,对样品的测定结果令人满意。     

靶场红外成像测量设备精度检测方法研究

提出了采用动态精度检测靶标对红外跟踪测量系统进行检测的方法。分析了靶标与被检测设备的空间运动关系。研究了跟踪性能和测量精度。对检测数据进行了计算处理,检测结果验证了这种检测方法的可行性。     

荧光法测定片剂中的秋水仙碱

秋水仙碱在硫酸溶液中水解后产生弱的稳定的荧光。在ｐＨ４￣ｐＨ６范围内,镧（Ⅲ）离子可与水解秋水仙碱发生络合反应,络合后芝光强度增加了６倍。最大激发及发射波长为２４６ｎｍ和４３０ｎｍ。在０．１￣１０ｍｇ／ｌ浓度范围内,荧光强度与浓度有良好的线性关系,本方法已用于片剂中秋水仙碱含量的测定,测定了下限为０．１ｍｇ／Ｌ,相对标准偏差为４．３％。     

ICP-AES法测定色漆可溶性金属含量

用ICP-AES法测定了色漆中的“可溶性”金属铬、镉、铅元素，考察了不同酸度对分析结果的影响，优化了测试条件。进行了回收率和精密度试验。并用原子吸收光谱国标方法进行对照，结果一致。     

基于STIRPAT模型的我国制造业碳排放影响因素研究

本文采用岭估计法和STIRPAT模型,定量分析了人口、财富和技术因素对我国制造业碳排放的影响,认为人口和财富因素对我国制造业碳排放存在正向作用,影响系数值分别为0.529和0.2565;技术因素有负向作用,其影响系数为-0.0965。构建了引入人口和财富二次方项的STIRPAT模型,二次方项的系数都为正,说明环境库兹涅茨倒U型曲线不适用于我国目前制造业碳排放,即我国制造业碳排放短期内不会出现拐点。最后给出了相应的对策建议。     

Great expectations: Specific lexical anticipation influences the processing of spoken language

Background  

Recently several studies have shown that people use contextual information to make predictions about the rest of the sentence or story as the text unfolds. Using event related potentials (ERPs) we tested whether these on-line predictions are based on a message-level representation of the discourse or on simple automatic activation by individual words. Subjects heard short stories that were highly constraining for one specific noun, or stories that were not specifically predictive but contained the same prime words as the predictive stories. To test whether listeners make specific predictions critical nouns were preceded by an adjective that was inflected according to, or in contrast with, the gender of the expected noun.     

Microwave heating of ceramic composites

The microwave heating of a ceramic composite is modelled andanalysed. The composite consists of many small ceramic particlesembedded in a ceramic cement. The composite is assumed to bewell insulated, and each particle is assumed to be in imperfectthermal contact with the surrounding cement. Based on thesetwo assumptions an asymptotic theory exploiting the small Biotnumber and small non-dimensional contact conductance is developed.Our asymptotic theory yields a set of nonlinear partial differentialequations which govern the temperature in the composite. Theseare reduced to a set of coupled nonlinear ordinary differentialequations in which the surface area of each particle entersas a parameter. Recent experiments with such composites haveshown that the steady-state temperature of the composite isstrongly dependent upon the radii of the embedded particles.Our model captures this effect. In fact, our analysis showsthat the assumption of imperfect thermal contact between theparticles and the ceramic cement is essential for this trendto be established.     

Anomalous atomic hydrogen shock pattern in a supersonic plasma Jet

A two-photon laser-induced fluorescence study on the transport of ground-state atomic hydrogen in a supersonic plasma jet, generated from an Ar-H (2) mixture, reveals an unexpected shock pattern. Whereas both the axial-velocity profile and the temperature profile of hydrogen atoms along the jet centerline can be interpreted in terms of a supersonic expansion of an Ar-H gas mixture, the H-atom density profiles do not satisfy the well established Rankine-Hugoniot relation leading to a nonconservation of the forward flux. The experimental results show that H atoms escape from the supersonic expansion by a diffusion process due to strong density gradients between the core of the jet and its vicinity.