Cu2ZnSnS4 solar cell prepared entirely by non-vacuum processes

Cu₂ZnSnS₄ (CZTS) solar cell with superstrate structure of fluorine-doped tin oxide glass/TiO₂/In₂S₃/CZTS/Carbon was prepared entirely by non-vacuum processes. The compact TiO₂ window and In₂S₃ buffer layers, CZTS absorber layer and Carbon electrode layer were prepared by spray pyrolysis method, ball milling and screen printing combination processes and screen printing process, respectively. The short-circuit current density, open-circuit voltage, fill factor and conversion efficiency of the best fabricated solar cell are 8.76 mA/cm², 250 mV, 0.27 and 0.6%, respectively. The fabrication process for the CZTS solar cell did not employ any vacuum conditions or high-toxic materials (such as CdS, H₂Se, H₂S or Se).     

荧光粉Sr3-x-yAl2O6∶xCe3+,yEu2+的制备及其发光特性

采用高温固相反应法制备了Sr3-x-yAl2O6:xCe3+,yEu2+(x=0,y=0;x=0.04,y=0;x=0.04,y=0.02;x=0.04,y=0.04;x=0.04,y=0.06;x=0.04,y=0.08;x=0,y=0.04)荧光粉,研究其相组成与荧光特性,结果表明,样品具有单相Sr3Al2O6晶体结构。在360nm波长的紫外光激发下,Ce3+离子辐射出峰值在434nm附近的宽谱蓝光。通过能量传递作用,Eu2+离子辐射峰值为517nm左右的宽谱绿光。Ce3+和Eu2+的荧光组合获得了色坐标为(0.2611,0.3313)的近白光发射。样品的激发光谱分布在250～400nm的波长范围,这种荧光粉有望在紫外或近紫外激发的白光LED中获得应用。     

Improved hydrogen storage performance of MgH2–NaAlH4 composite by addition of TiF3

In a previous paper, it was demonstrated that a MgH₂–NaAlH₄ composite system had improved dehydrogenation performance compared with as-milled pure NaAlH₄ and pure MgH₂ alone. The purpose of the present study was to investigate the hydrogen storage properties of the MgH₂–NaAlH₄ composite in the presence of TiF₃. 10 wt.% TiF₃ was added to the MgH₂–NaAlH₄ mixture, and its catalytic effects were investigated. The reaction mechanism and the hydrogen storage properties were studied by X-ray diffraction, thermogravimetric analysis, differential scanning calorimetry (DSC), temperature-programmed-desorption and isothermal sorption measurements. The DSC results show that MgH₂–NaAlH₄ composite milled with 10 wt.% TiF₃ had lower dehydrogenation temperatures, by 100, 73, 30, and 25 °C, respectively, for each step in the four-step dehydrogenation process compared to the neat MgH₂–NaAlH₄ composite. Kinetic desorption results show that the MgH₂–NaAlH₄–TiF₃ composite released about 2.4 wt.% hydrogen within 10 min at 300 °C, while the neat MgH₂–NaAlH₄ sample only released less than 1.0 wt.% hydrogen under the same conditions. From the Kissinger plot, the apparent activation energy, E_A, for the decomposition of MgH₂, NaMgH₃, and NaH in the MgH₂–NaAlH₄–TiF₃ composite was reduced to 71, 104, and 124 kJ/mol, respectively, compared with 148, 142, and 138 kJ/mol in the neat MgH₂–NaAlH₄ composite. The high catalytic activity of TiF₃ is associated with in situ formation of a microcrystalline intermetallic Ti–Al phase from TiF₃ and NaAlH₄ during ball milling or the dehydrogenation process. Once formed, the Ti–Al phase acts as a real catalyst in the MgH₂–NaAlH₄–TiF₃ composite system.     

粉煤灰基质滤料对水中苯酚的吸附研究

实验研究了颗粒状粉煤灰基质滤料吸附水中苯酚的性能及主要影响因素,主要探讨了投加量、pH、接触时间、温度和初始浓度对吸附效果的影响。结果表明了,该粉煤灰基质滤料对水中的苯酚具有较强的吸附能力,投加量对苯酚去除效果影响较大。控静JpH为7．0、温度为30℃,在初始苯酚浓度为100mg／L盼溶液中投加140g／L滤料,经过90min的吸附,苯酚去除率可达95．87％。     

橡胶企业使用塑解剂的经济与质量效益分析

橡胶加工企业在使用橡胶原材料时,往往都需要对橡胶进行塑炼,以寻求一定的可塑度,用来满足工艺要求。当橡胶的可塑度值大一些的时候,会对工艺带来一系列的好处：（1）使生胶的可塑性增大,以利混炼时配合剂的混入和均匀分散;（2）改善胶料的流动性,便于压延、压出操作,使胎坯形状和尺寸稳定;（3）增大胶料粘着性,方便成型操作;     

氟代聚丙烯酸酯改性阳离子型聚氨酯乳液的制备

以丙烯酸十二氟庚酯(FA)、丙烯酸羟丙酯(HpAA)为单体,通过偶氮二异丁腈(AIBN)引发聚丙烯酸酯自由基在交联的聚氨酯预聚体中进行聚合,并用N-甲基二乙醇胺(MDEA)进行亲水基扩链,溶液聚合相转化法制得新型氟代聚丙烯酸酯改性阳离子型聚氨酯复合乳液(FPUA)。对聚合物结构、乳胶粒形态进行表征。结果表明,以丙酮为溶剂,n_(NCO)/n_(OH)=1.3,MDEA质量分数6.5%、FA质量分数为8%时能得到半透明蓝光、稳定性良好的核-壳结构乳液,FPUA胶膜拉伸强度为19 MPa,吸水率为6.9%,接触角为101°,产品的耐水性优良。     

风电场的静止无功补偿控制策略的安全运行措施

风力发电作为一种新兴的清洁能源,已经得到了广泛地应用。风力发电的快速发展,一方面体现了国家对新能源建设的力度,另一方面也对电网的安全稳定运行带来了相应的问题。针对风电场静止无功补偿器(SVC)在运行中出现的问题,进行分析并提出了改进措施,用以提供风电场SVC的安全稳定运行水平。     

多元线性回归和BP神经网络对大麦根磷脂酶提取条件预测的比较

以单因素试验和中心旋转试验为基础,建立了大麦根中提取磷脂酶的2种预测模型——BP神经网络模型和多元线性回归模型,通过对2种模型预测值和试验实测值的比较发现,神经网络模型比多元回归模型具有更强的预测能力。     

稳态工作条件下功率晶体管结温的测量与控制

为了在试验周期中了解晶体管的结温,提出一种在功率晶体管稳态工作寿命试验过程中结温的测量与控制方法.着重介绍了基于理想pn结肖克莱方程的结温测量原理,及试验过程中结温测控的技术难点和解决方案,指出了晶体管结温计算中存在的问题和修正办法,实验结果证明了该方法的可行性.