基于函数插值的柯氏质量流量计信号处理方法

对基于离散傅里叶变换(DFT)信号处理方式的柯氏质量流量计来说,影响其精度的关键问题是如何实现信号的整周期采样。提出了一种全新的方法,用采样率固定不变的采样数据,通过软件实时地确定信号的频率并且实现信号整周期重新采样。实验结果表明该方法在求取相位差时具有极高的精度。     

A computer program for internal conversion coefficients and particle parameters

Title of program: CATAR Catalogue number: ABGP Program obtainable from: CPC Program Library, Queen's University of Belfast, N. Ireland (see application form in this issue) Computer: UNIVAC 1108; Installation: Sandoz A.G., Basel, Switzerland Operating system: EXEC 8 Programming language used: FORTRAN IV High speed store required: 26K words No. of bits in a word: 36 Overlay structure: None Number of magnetic tapes required: None Other peripherals used: Card reader, line printer Number of cards in combined program and test deck: 3136 Card punching code: BCD     

超低VOC新型环保涂料的研制

以硬单体为核聚合物（高强）,软单体为外壳（低瞻）采用半连续种子聚合,加大引发剂用量,造成“饥渴”反应条件,控制核／壳形态。用两阶段或多阶段法,采用幂级加料,多次加料法,进行（半）浮胀半连续聚合,提高聚合速率和降低凝并效应,严格控制聚合场所,合成出性能优良的超低VOC水性乳液,以此乳液研制出各项指标达到国标要求且具有超低VOC的新型环保涂料。     

选矿浓缩过程矿浆浓度的模糊控制

针对治金行业选矿浓缩过程的工艺特点,介绍了基于变频技术的矿浆浓度模糊控制,较好地控制了浓度指标,同时也稳定了矿浆流量并大幅度节能降耗。该设计已在宝钢、武钢等选矿厂中得到成功应用,效益显著。     

预钙化加速类骨磷灰石在镍钛合金表面生长的电化学阻抗谱

通过酸碱处理活化NiTi合金表面,在模拟体液中仿生生长类骨磷灰石层以改善其生物相容性.采用电化学阻抗谱研究了预钙化对加速磷灰石沉积的影响,并基于双层模型建立了电子等效电路.结果表明:随着在模拟体液中浸泡时间的延长,化学处理的NiTi合金表面类骨磷灰石不断生长,并且添加预钙化试样浸泡3 d,即可在合金表面生长出均匀完整的类骨磷灰石层,而未预钙化试样表面沉积物稀少.对应电子等效电路中,预钙化试样电阻值明显大于未预钙化试样的,显示预钙化促进了活化NiTi合金表面类骨磷灰石的生长.     

正极材料LiNi1/3CO1/3Mn1/3O2包覆LiNi0.8Co0.15Al0.05O2的性能

以NiSO4·6H2O、CoSO4·7H2O、MnSO4·H2O、NH3·H2O及NaOH为原料,采用共沉淀方法在LiNi0.8 C00.15 Al0.05 (OH)2球形粒子表面包覆一层Ni1/3 Co1/3Mn1/3(OH)2三元材料前驱体,配锂后在750℃下、氧气气氛中焙烧12 h,合成复合层状材料Li[(Ni0.8 Co0.15Al0.05)0.97(Ni1/3Co1/3Mn1/3)0.03]O2.复合层状材料具有核壳结构,包覆壳层的厚度约为1μm.复合层状材料在2.8～4.3 V充放电,0.1C首次放电比容量为188.2 mAh/g;0.2 C循环100次的容量保持率为96.2％;在55℃下以0.2C循环100次,放电比容量保持在163.2 mAh/g.     

水电站零压起动和变频技术在线路融冰中的应用

通过理论计算和现场在用的设备相结合,利用小水电站零电压起动、变频,均压起励的方法融冰取得良好、效果。     

Geographical variation of the conversion efficiency of crystalline silicon photovoltaic modules in Europe

We present a geographical assessment of the performance of crystalline silicon photovoltaic (PV) modules over Europe. We have developed a method that is based on a material specific analytical expression of the PV conversion efficiency, relative to nominal efficiency, as a function of module temperature and irradiance. This method is combined with a climate database that includes average daytime temperature and irradiance profiles. It is found that the geographical variation in ambient temperature and yearly irradiation causes a decrease in overall yearly PV performance from 3 to 13% relative to the performance under Standard Test Conditions, with the highest decrease found in the Mediterranean region. Based on the above results we developed a simplified linear expression of the relative PV module efficiency that is a simple function of yearly total irradiation and yearly average daytime temperature. The coefficients to the linear expression are found by fitting to the map resulting from the above‐mentioned analytical approach. The prediction of total yearly PV output from this linear fit deviates less than 0·5% from the more detailed calculation, thus providing a faster and more simplified alternative to the yield estimate, in the case when only limited climate data are available. Copyright © 2008 John Wiley & Sons, Ltd.     

交流变频技术在大型铸造起重机的应用方案探讨

本文简要介绍了大型铸造起重机结构形式和工艺特点,以及交流变频技术目前发展特点,针对铸造起重机的工艺特点和各机构的负载特点,分析了交流变频技术在大型铸造起重机中应用的可行性和先进性。     

TA2纯钛材阳极氧化着色工艺

对钛及钛合金进行阳极氧化处理可提高其作为生物医用材料的性能.将TA2纯钛片在磷酸、葡萄糖酸钠混合溶液中阳极氧化得到不同颜色的氧化膜,研究了电解液配方、阳极氧化工艺参数(电压、电流密度、氧化时间、电解液温度)、基材酸洗前处理以及氧化膜封孔后处理对氧化膜质量的影响.结果表明:磷酸浓度影响膜层的均匀性和颜色深浅,葡萄糖酸钠浓...