Electrochemical assembling of aligned porous Nd(OH)3 nanobelts with high performance in water treatment

In this study, aligned Nd(OH)₃ nanobelts with abundant mesopores are successfully assembled by a facile, and template-free electrochemical method. The well-defined porous structure in Nd(OH)₃ nanobelts leads to its superior adsorption and the remove rate of Congo red contained in wastewater reach to 99.1% in 30 min.     

差频产生中红外光源的线宽分析

差频法具有无需复杂腔型调整、输出激光调谐范围宽、效率较高等综合优点,是获得3～5μm中红外激光光源的重要手段。推导了差频产生中红外激光的输出光波长、线宽以及功率的公式,重点讨论了输出激光线宽与抽运光波长和线宽、信号光线宽以及温度等因素的关系。结果表明,输出激光线宽主要由抽运光和信号光的线宽决定。     

塑造特色校园,彰显校园文化——以武汉工程大学黄龙山校区规划为例

本文在分析当前校园规划建设存在的问题后,阐述了校园规划建设中环境特色和文化意识的重要性,然后结合武汉工程大学黄龙山校区规划的实例围绕如何营造环境特色鲜明的校园、如何延续原有校区的人文历史脉络和如何构建能够营造浓厚校园文化氛围的多样化交往空间等方面进行探讨,以期对校园规划建设起到理念推动和实践参考的作用。     

Existence and uniqueness of mild solutions for abstract delay fractional differential equations

In this paper, by means of solution operator approach and contraction mapping theorem, the existence and uniqueness of mild solutions for a class of abstract delay fractional differential equations are obtained.     

便携式螺柱焊机测试器的设计

针对螺柱焊机传统测试台价格昂贵、操作复杂以及搬运困难的缺点,提出了一种成本低廉、操作简单的新型便携式测试器.为了满足测试器与上位机传送测试数据的需要,引入了基于Modbus-RTU协议的RS-232硬件平台;测试器采用基于32位ARM嵌入式系统平台的SoC解决方案.在实际使用过程中,测试器取得了很好的效果,其设计的正确性和可行性也得到了验证.     

Comparative investigating the properties of Pb-based multilayer ferroelectric thin films for FeRAM

The PbZr_0.3Ti_0.7O₃(PZT) thin film and multilayer PbZr_0.3Ti_0.7O₃/PbTiO₃(PZT/PT), PbTiO₃/PbZr_0.3Ti_0.7O₃/ PbTiO₃(PT/PZT/PT) thin films were prepared by a Sol-Gel method on the Pt(111)/Ti/SiO₂/Si(100) substrate for FeRAM application. The microstructure, ferroelectric, fatigue, dielectric, and leakage current properties of these thin films were investigated. The results indicate that the multilayer PT/PZT/PT thin film have a better ferroelectric, fatigue, dielectric and leakage current density properties. Its remanent polarization P_r reaches a maximum value of 21.2 μC/cm² and the coercive field E_c gets to a minimum value of 64.2kV/cm. After 10¹⁰ cycles, it still has more than 80% remnant polarization. The PT/PZT/PT thin film exhibits lower dielectric constant and lower dielectric loss, which is beneficial for FeRAM application. It also has the lowest leakage current density. The leakage current mechanism of the PZT, PZT/PT and PT/PZT/PT thin films is correlated to the microstructure and can be modeled in terms of GBLC and SCLC theory. The microstructure and electric properties of these films are correlated. The double-sided PT seed layers enhance not only the microstructure but also the electric properties. It is evident that the PT/PZT/PT multilayer thin film is a promising candidate for FeRAM application.     

中心传动磨机减速机齿轮动载荷分析

本文在建模分析的基础上,研究中心传动磨机减速机齿轮副振动特性,分析齿轮误差对齿轮动载荷的影响。并结合实际测量齿轮的振动,探明了这类减速机齿轮产生动载荷的主要成因。     

活性炭及硅藻土对染料的吸附特性研究

采用活性炭、硅藻土、氢氧化镁改性硅藻土对1种阳离子染料和2种阴离子染料进行了吸附研究.BET液氮吸附法测定结果显示硅藻土改性后的比表面积增大而平均孔径降低;染料吸附结果表明:硅藻土改性后对天龙红(TR)及雷马素金黄(RGY)两种阴离子染料的吸附性能提高,而对阳离子染料亚甲基蓝的吸附性能降低;改性硅藻土对天龙红的吸附容量大于活性炭,而对雷马寨金黄及亚甲基蓝的吸附容量低于活性炭;采用准一级、准二级两种吸附动力学模型对染料的吸附动力学数据进行了拟合,结果显示改性硅藻土及活性炭的染料吸附过程更符合准二级动力学模型.     

Experimental and numerical investigation of heat transfer characteristics in a square channel with various truncated ribs

Oblique ribs are widely applied to the internal cooling of turbine blades to promote the heat transfer between blade wall and coolant. In this study, the effect of several new types of truncated ribs on the heat transfer characteristics in 45° oblique rib channels is investigated experimentally and numerically. The numerical results obtained by the SST k-ω turbulence model agree well with the experimental data for the Reynolds number ranging from 10000 to 60000. The results indicate a significant entrance effect on the heat transfer in truncated rib channels. The numerical results show that ribs continuously truncated at 3.8 mm gives the best heat transfer performance among the newly truncated ribs. Compared with the original structure, the Nusselt number and heat transfer enhancement factor of newly truncated ribs increased by 24.6 % and 17.8 %, respectively. Concurrently, the friction factor is reduced by 5.1 %.

     

超声波对棉织物活性染料染色的作用机制

为了降低染色温度和减少染化料用量,减少环境污染,以纯棉织物为研究对象,在超声波或常规染色条件下,采用活性染料汽巴克隆红LS-6G对其染色,从热力学及动力学两方面探讨超声波对活性染料棉织物染色的作用机制。实验结果表明,超声波不能改变活性染料上染棉纤维的吸附等温线类型;但能使染料对纤维的亲和力增大;染色焓减少54.61%、染色熵减少37.15%。超声波还能使扩散系数增大1倍左右、染色速率常数增加50%以上,染色活化能降低42.01%,半染时间缩短一半左右。