Investigations on the Sensing Mechanism of Humidity Sensors Based on Poly(4-vinylpyridine)/carbon Black Composite by AC Impedance Spectra

1 Results Investigations on the sensing mechanism is important for understanding the electrical responses of humidity sensors to humidity change,and could provide guidelines for the design and synthesis of humidity sensitive materials with desirable properties.In this work,the sensing mechanism of humidity sensors based on quaternized poly(4-vinylpyridine) (PVP)/carbon black (CB) composite[1] was studied by measuring their AC impedance spectra at various humidities at room temperature.Under low humidity...     

加减荆防败毒散治疗上呼吸道感染104例

对104例上呼吸道感染患者采用加减荆防败毒散治疗,发现此方治疗上呼吸道感染疗效显著,尤其适合以咽痛、咳嗽为主的上呼吸道感染患者,现将结果报告如下.     

结合山区农村学校实际，开发校本课程资源

《基础教育课程改革纲要（试行）》指出：“为保障和促进适应不同地区、学校、学生的要求，实行国家、地方和学校三级课程管理”，“学校在执行国家和地方课程的同时，应视当地社会、经济发展的具体情况，结合本校的传统和优势，学生的兴趣和需要，开发和选用适合本校的课程”。作为国家课程和地方课程的有益补充，校本课程资源开发的意义是不言而喻的。     

阴极保护检查片评估西气东输苏浙沪管段的保护效果

依据2004年美国国家标准学会(ANSI)和腐蚀工程师协会(NACE)联合发布的阴极保护检查片新技术标准,于2005-2006年在西气东输管道苏浙沪管段沿线,开展检查片评估阴极保护效果的现场试验.经过检查片设计、试验方案实施以及数据处理分析,得到了管道沿线阴极保护度和土壤腐蚀性分布;获得该地区IR降误差的统计值为170mV,并修正了管道保护电位准则(以-1.02V替代-0.85V).研究结果表明:受杂散干扰的马鞍山、芜湖附近管道受到良好保护;东桥、无锡处管道保护电位衰减过快,存在接地的可能;该阴极保护系统容量至少覆盖试验中大、小检查片的面积变化;利用危险性矩阵可以分析管道外腐蚀危害的风险等级、危险来源等.     

升巨散对实验性血小板减少症的治疗作用研究

采用水提醇沉法将升巨散制成冲剂,对实验性血小板减少症的治疗,表明升巨散具有升高外周血小板数量之功效,差异显著(P<0.15).相继在出血时问、凝血时间和24h 血块收缩实验中,也间接证实本品有升高外周血小板数量之作用。又在骨髓象检查中,发现升巨散能提高骨髓之巨核细胞及血小板数量,差异显著。本品 LD_(50)及95%可信限为70.88±2.62g/kg。     

Study on Approach for Computer-Aided Design and Machining of General Cylindrical Cam Using Relative Velocity and Inverse Kinematics

Cylindrical Cam Mechanism which is one of the best eq uipments to accomplish an accurate motion transmission is widely used in the fie lds of industries, such as machine tool exchangers, textile machinery and automa tic transfer equipments. This paper proposes a new approach for the shape design and manufacturing of the cylindrical cam. The design approach uses the relative velocity concept and the manufacturing approach uses the inverse kinematics concept. For the shape desig n, the contact points betw...     

Modeling of Agile Manufacturing Execution Systems with an Agent-based Approach

Agile manufacturing execution systems (AMES) are used to help manufacturers optimize shop floor production in an agile way. And the modeling of AMES is the key issue of realizing AMES. This paper presents an agent-based approach to AMES modeling. Firstly, the characteristics of AMES and its requirements on modeling are discussed. Secondly, a comparative analysis of modeling methods is carried out, and AMES modeling using an agent-based approach is put forward. Agent-based modeling method not only inherit ...     

Surface Modification Process by Electrical Discharge Machining with Ti Powder Green Compact Electrode

This paper describes a new method of surface modification by Electrical Discharge Machining (EDM). By using ordinary EDM machine tool and kerosene fluid, a hard ceramic layer can be created on the workpiece surface with Ti or other compressed powder electrode in a certain condition. This new revolutionary method is called Electrical Discharge Coating (EDC). The process of EDC begins with electrode wear during EDM,then a kind of hard carbide is created through the thermal and chemical reaction between the wo...     

对时域有限差分(FDTD)法误差的分析

时域有限差分（ＦＤＴＤ）法已经在许多领域得到了应用，但对该方法的误差分析还停留在简单模型的数值解与其严格解进行比较的基础上，本文从理论上对ＦＤＴＤ法误差的来源进行了研究，并提出几种减小误差的办法。