电感耦合等离子体原子发射光谱法测定烧结增效剂中三氧化二硼和二氧化锰

提出了电感耦合等离子体原子发射光谱法测定烧结增效剂中主成分三氧化二硼和二氧化锰含量的方法。用盐酸-硝酸混合溶液溶解样品,选择波长257.610,249.773 nm两条谱线分别作为测定硼和锰的分析线,采用背景校正来扣除干扰。方法用于烧结增效剂样品分析,测定结果与化学法测定值相一致。     

电化学法制备CdSexTey薄膜及其光电性能

以Cd(NO3)2·4H2O,Na2 SeO3和Na2TeO3的混合液为电解液,采用电化学共沉积法在氧化铟锡(ITO)玻璃基底上制备了CdSexTey薄膜样品.探讨了沉积电压、水浴温度、沉积时间以及Cd,Te和Se物质的量比等制备条件对样品在模拟太阳光下的开路电压的影响.结果表明,在沉积电压为3.0V,水浴温度为50℃,沉积时间为30 min,n(Cd)∶n(Te)∶n(Se)=5.6∶1∶1时制备的CdSexTey薄膜具有较高的开路电压,其值可达到0.464 1 V.X射线衍射(XRD)分析结果显示,CdSexTey样品中含单质态Se,CdSexTey的3个主要衍射峰对应的晶粒尺寸分别为43.07,44.56和44.03 nm.能谱分析(EDS)结果显示,样品中Cd,Te,Se元素的质量分数分别是6.53％,6.25％和14.52％,原子数分数分别为1.68％,1.42％和5.32％.对Cd元素原子数分数进行归一化处理,则样品CdSexTey中x为3.17(其中有化合态Se2-为0.15,单质态Se为3.02),y为0.85.     

变频器在选矿生产中的应用与抗干扰措施

在选矿生产中，变频器应用越来越广泛，本文介绍了变频器的节电原理、造型、安装以及实际应用中注意事项和抗干扰方法。     

MATHEMATICAL PROBLEMS ON THE FLUID-SOLUTE-HEAT FLOW THROUGH POROUS MEDIA Ⅰ. UNSATURATED CASE

A degenerate parabolic system arising from the fluid-solute-heat flow through unsaturatedporous media is considered. The existence of weak solutions to the initial boundary value problemof this system is esteblished by parabolic regularizaton. The regularity is proved as well, i. e. theweak solutions satisfy the equations and initial boundary conditions pointwise in the region wherethe moisture content is positive.     

THE BOUNDARY VALUE PROBLEMS FOR THE FILTRATION EQUATION IN PARTIALLY SATURATED POROUS MEDIA

In this paper we considered the first and the second boundary value problems for one-dimensionalfiltration in partially saturated porous media.The existence,uniqueness and regularity of weaksolutions were obtained.We also studied the interface problems and discussed the asymptotic behaviorof weak solutions.     

Supercontinuum generation in seven-core photonic crystal fiber pumped by a broadband picosecond pulsed fiber amplifier

We report a supercontinuum source generated in seven-core photonic crystal fibers(PCFs) pumped by a self-made all-fiber picosecond pulsed broadband fiber amplifier. The amplifier's output average power is 60 W at 1150 nm with spectral width of 260 nm, and its repetition rate is 8.47 MHz with pulse width of 221 ps. With two different lengths of seven-core PCF, different output powers and spectra are obtained. When a 10 m long seven-core PCF is chosen, the output supercontinuum covers the wavelength range from 620 nm to 1700 nm, with the output power of 11.7 W. With only 2 m long seven-core PCF used in the same experiment, the wavelength of the supercontinuum spans from 680 nm to 1700 nm,with the output power of 20.4 W. The results show that the pulse width is 385 ps in the 10 m long seven-core PCF and 255 ps in the 2 m long one, respectively, due to the normal dispersion of the PCF.     

锂离子电池用复合导电剂浆料制备与性能

采用超声波混合、抽滤的方法把多壁碳纳米管(MWCNTs)和乙炔黑混合制备了锂离子电池用复合导电剂浆料,用扫描电子显微镜(SEM)和恒流充放电测试考察了复合导电剂的结构和其作为导电剂对LiCoO2电极放电比容量的影响.SEM的分析结果表明MWCNTs和乙炔黑实现了纳米层次的均匀混合.复合导电剂悬浮液和浆料分别被用作导电剂制成了两种LiCoO2电极,前一种电极为Cathode A,后一种电极为Cathode B,考察了不同MWCNTs含量时,两种电极0.5 C第10次放电比容量的差异.实验结果表明,随着MWCNTs含量的增加,两种电极放电比容量的差值增大,说明低含量MWCNTs的复合导电剂浆料是一种理想的锂离子电池导电剂.     

RF excited diffusively cooled all-metal slab waveguide CO_2 laser

In this paper, a new type of radio frequency (RF) excited diffusively cooled all-metal slab waveguide CO2 laser is presented, in which the waveguide channel is constructed by two aluminum side walls and two aluminum electrodes, the discharge is confined in the slab waveguide channel in terms of the voltage division structure. From this type of structure, 127-W laser power is obtained.     

MATHEMATICAL PROBLEMS ON THE FLUID-SOLUTE-HEAT FLOW THROUGH POROUS MEDIA Ⅱ. PARTIALLY SATURATED CASE

A degenerate parabolic system arising from the fluid-solute-heat flow through partiallysaturated porous media is considered. The existence of weak solutions to the initial boundary valueproblem of this system is established by time discretization, and the continuity of the weak solutionsis discussed.     

AN ELLIPTIC-PARABOLIC SYSTEM ARISING FROM THE FLUID-SOLITE-HEAT FLOW THROUGH SATURATED POROUS MEDIA

In this paper an elliptic-parabolic coupled system arising from the fluid-solute-heat flowthrough a saturated porous medium is considerd.The uniqueness and the existence of classicalsolutions are proved.The asymptotic behavior of solutions for large time is shown,too.