基于VB的智能火灾报警系统设计

提出了一种基于电力线载波的分布式智能火灾报警系统，介绍了它的结构和工作原理，重点阐述了PC机与单片机之间的通信协议以及基于VB的PC机与多单片机之间的通信软件设计。     

Au/SnO2/n-Si (MOS) structures response to radiation and frequency

Metal-insulator-semiconductor (MOS) structures with insulator layer thickness of 290 Å were irradiated using a ⁶⁰Co (γ-ray) source and relationships of electrical properties of irradiated MOS structures to process-induced surface defects have been investigated both before and after γ-irradiation. The density of surface state distribution profiles of the sample Au/SnO₂/n-Si (MOS) structures obtained from high-low frequency capacitance technique in depletion and weak inversion both before and after irradiation. The measurement capacitance and conductance are corrected for series resistance. Series resistance (Rs) of MOS structures were found both as function of voltage, frequency and radiation dose. The C(f)-V and G(f)-V curves have been found to be strongly influenced by the presence of a dominant radiation-induced defects. Results indicate interface-trap formation at high dose rates (irradiations) is reduced due to positive charge build-up in the semiconductor/insulator interfacial region (due to the trapping of holes) that reduces the flow rate of subsequent holes and protons from the bulk of the insulator to the Si/SnO₂ interface. The series resistance decreases with increasing dose rate and frequency the radiation-induced flat-band voltage shift in 1 V. Results indicate the radiation-induced threshold voltage shift (ΔV_T) strongly dependence on radiation dose rate and frequency.     

绢纺织物结构参数对造型性影响的研究

运用多元回归分析的方法对绢纺织物的结构参数与造型性指标之间的关系进行了研究 ,揭示了绢纺织物造型性的特点。     

潘赵庄铜镍矿区构造逐级控制及构造指示矿特征探讨

基于构造逐级控制理论,以褶皱区的区域地质为背景,运用地质构造解析和物化探等工作方法认为,区域构造控制矿区构造,矿区构造反映区域构造。研究区处于构造有利区,岩石化学特征对形成铜镍硫化物矿床较为有利,具备了铜镍硫化物矿床的找矿前提,确定有利靶区受构造控制作用明显,存在于岩体中下部熔离型矿体及岩体边贯入式矿体两处。     

水族箱水质调节剂

腐植酸具有离子交换、吸附、螯合等性能，是营造天然水质的源泉。客观存在对水族箱中热带观赏鱼的生息和水革的生长具有保健和促长作用。用腐植酸和硫酸钾、硫酸铁、硫酸镁、硫酸话等按一定比例，并适当添加B族维生素配制成营养液，选择聚乙烯醇为粘结剂，加入粘土和细沙，制成腐植酸颗粒基肥，置于水族箱底部，可保持水质不浑浊，水草苍翠繁茂多姿多彩，观赏鱼绚丽健壮活跃，更有观赏价值。     

铬上镀铬工艺初探

采用“阶梯式给电法”成功地解决了铬上镀铬问题，并介绍了铬上镀铬工艺的操作要点和注意事项，经生产验证，铬上镀铬层光泽好，结合力好，具有一定的应用价值。     

啤酒酵母的遗传改良途径

本文介绍了诱变与选择、杂交、原生质体融合和基因工程在啤酒酵母改良上的应用 ,重点介绍了原生质体融合和基因工程的应用。     

酸碱-萃取法制备辣椒碱类化合物工艺探讨

以辣椒精为原料,以NaOH溶液为溶剂,利用HPLC分析法对酸碱-萃取法制备辣椒碱类化合物工艺进行了优化比较。结果表明,以投料比为:辣椒精(含辣椒碱类化合物1%)∶10%NaOH=1g∶3mL,在60℃搅拌速度较大情况下提取5h,静置分层,取下层水相加稀盐酸调节pH为5时,经石油醚、丙酮两次萃取,浓缩结晶,得辣椒碱类化合物粗产品,产率可达70.64%,经乙醚重结晶后纯度达93.5%。     

Negative creep during compressive creep of as-cast ZA27 alloy

1　INTRODUCTIONAmongzinc aluminumcastalloy ,ZA2 7alloyex hibitsattractive physicalandmechanicalpropertiescombinedwithgoodfrictionandwearresistanceprop ertiesmakingitabearingalloyreplacingsomecopperalloys[1,2 ] .However ,somepropertiesofthisalloywhichmustbetakenintoaccountarecomparativelylowresistancetocreepdeformation ,poorstrengthanditsdimensionalinstabilityatmoderatelyelevatedtemperatures[35] .Thedimensionalchangesofas castZA2 7alloyonageingwerestudiedbysomework ers[1,3,6 ] ,butthesere…