基于LabVIEW的航空火警控制盒测试设备

航空火警控制盒测试设备是一套主要用于火警控制盒、火警探测器、主告警控制盒、告警控制盒等的校验、故障诊断的设备。介绍了一种基于LabVIEW的航空火警控制盒测试设备的方法,利用PC机中的LabVIEW图形化编程软件采用随机数读取并且显示,再对信号进行分析,对超限信号起到报警功能。     

粉末冶金TiAl合金排气门的研制

利用元素粉末冶金方法制备了TiAl合金排气阀。为提高排气门杆部的致密度、均匀度 ,设计了特有的径向热压工艺 ,并从理论上分析了与该工艺相关的压坯密度、致密化和应力变化规律。制备出高径比为 10 .7,密度为 3.79g/cm3 的粉末冶金TiAl合金汽车发动机排气门     

碳含量对缺碳硬质合金组织和性能的影响

通过配制不同碳含量的WC-6Co缺碳硬质合金,采用X射线衍射、光学金相、显微硬度、钴磁和TRS等分析方法,对比研究碳含量对低压烧结缺碳硬质合金的显微组织和性能的影响。结果表明:碳含量影响合金中η相的类型、含量、分布、WC的形状以及合金的性能;Co3W3C相出现在缺碳程度相对较小的合金中,其含量随碳含量的增加而增大,而Co6W6C相与之相反;合金中的η相总量随碳含量的增大而减少;随着缺碳程度的增加,合金中η相的分散均匀性变差,并且η相趋向于成大块状;WC大多呈现多角特征;合金的密度和维氏硬度随着碳含量的增加,先大幅度增加后缓慢减小,碳含量为5.2%(质量分数)时均出现最大值,合金的钴磁和横向断裂强度随着碳含量的增加而增加。     

城市污水处理新型生物脱氮除磷技术研究进展

当下,我国城市污水处理厂的主要矛盾已由有机物的去除转向氮、磷等营养物的去除.而城市污水处理厂目前普遍采用的传统生物脱氮除磷工艺因其自身的特点及城市污水特征,导致氮、磷污染物去除效率无法满足愈发严格的国家标准.针对这种问题,通过对同步硝化反硝化、厌氧氨氧化、反硝化除磷、短程硝化反硝化这些新型技术及其研究现状进行介绍,探究新型生物脱氮除磷技术在城市污水处理领域中应用的优越性与合理性.并基于多菌群协同除污机理,结合我国城市污水处理可持续发展现状,探索未来的技术发展方向.     

电网故障下光伏并网低压故障穿越控制策略的研究

电网发生故障或扰动可能造成光伏并网点电压跌落,严重影响电力系统的安全运行,光伏发电站有必要具备在电压跌落范围和时间内保证不脱网运行的能力。提出一种基于无功补偿的光伏并网低压穿越控制策略。该方法在检测到电压跌落时,通过断开外部电压环路将双闭环控制模式更改为单电流环路操作模式,采用改进后的无功补偿控制策略防止逆变器产生过电流,为电网电压提供无功补偿,较好实现不脱网运行。最后利用Matlab / Simulink软件比较和分析低压穿越控制策略前后的相关参数。仿真结果表明,改进的控制策略可以有效地抑制逆变器输出电流的增加,并且能提供无功功率来支持电网电压,以在电网电压骤降期间实现低压穿越。     

中国智能电网发展综述

随着中国经济的进一步发展,电力负荷增长迅速,电网供电压力增大,传统电网已无法满足日益增长的电力需求。因此,建立统一坚强的智能电网是中国电网发展的方向。介绍了智能电网的背景和定义以及智能电网的基本信息;叙述了中国智能电网发展现状涵盖了目前国家对智能电网的政策、投资以及智能电网示范项目;分析了中国智能电网发展在政策投资、相关技术研究、基础设施建设、概念推广方面存在的问题。指出为在资源与环境的约束下提高电力生产效率,改善电力结构,以最小社会成本满足最大经济发展需求,中国智能电网的发展势在必行。     

Thermal cross-linking and anti-meltdrop properties of copolyester containing phosphorus/magnesium salt composites by in situ polymerization

Polyester is widely used in household products because of its good mechanical properties and wears resistance, but polyester is easy to ignite and inclined to produce droplet, so its application range is limited. The cross-linkable magnesium hydroxide nanoparticles were incorporated into flame-retardant polyester, which enables the phosphorus-containing copolyester with thermal cross-linking and anti-meltdrop properties. The nanoparticles were achieved by in situ polymerization and acted as a nucleating agent for improving the crystalline properties of the copolyester. Furthermore, the nanoparticles also enhanced anti-meltdrop properties and reduced the heat and gas release during the combustion process of the copolyester. The maximum heat release rate and total smoke release reduced by 39.8% and 74.4% compared with pure polyester. Specifically, the combustion products of the nanoparticles and phosphorus flame retardant could act a barrier role by covering the carbon layer to isolate air and heat, thereby resulting in excellent anti-meltdrop properties. The simple modification method reported here realizes the collaborative modification of flame retardant and anti-meltdrop properties of phosphorous flame-retardant copolyesters by thermal cross-linking.     

Cation Effect on the Binary and Ternary Phase Behaviors of Double-Tailed Methanesulfonate Amphiphiles

A series of symmetrical dialkyl methanesulfonate amphiphiles [DiC _n CHSO ₃ ] _m M (n = 6, 7, 8) with different counter cations (M^m+ = H⁺, Li⁺, Na⁺, K⁺, Cu²⁺, Zn²⁺, Mg²⁺, Ca²⁺, Sc³⁺) were synthesized in five steps. Their solubility and critical micelle concentration (CMC) in water were determined highlighting a huge effect of the chain length and the nature of the cation. The hydrophilic–lipophilic balance of the surfactants were assessed with the phase inversion temperature (PIT)-slope method based on the deviation from the PIT of the reference C₁₀E₄/n-octane/0.01 M NaCl_(aq) emulsion through addition of increasing amounts of the dialkyl methanesulfonates. The hydrophilicity of the surfactants was thus ranked in terms of dPIT/dx_sulfonate. A “cation” scan with the [DiC ₆ CHSO ₃ ] _m M /benzene/water systems at f_w = 0.5 was finally performed confirming the hydrophilicity ranking obtained with the PIT-slope method. It revealed that the [DiC ₆ CHSO ₃ ] ₂ Mg behaves as a “Balanced Surfactant” able to form spontaneously a three-phase microemulsion system (Winsor III) just in the presence of water and oil, in the same way as the catalytic surfactant dimethyldioctylammonium molybdate, which has the same PIT-slope.     

Senescence Marker Protein 30 (SMP30): A Novel Pan-Species Diagnostic Marker for the Histopathological Diagnosis of Breast Cancer in Humans and Animals

Senescence marker protein 30 (SMP30) is a cell survival factor playing an important role in vitamin C synthesis and antiapoptosis. Moreover, its cytoprotective role suggests a possibility to be related to cancer cell survival. Mammary carcinoma is a common cancer in both humans and animals. Because of its histopathological diversity, especially in the early stage, histopathological diagnosis may be complicated; therefore, a diagnostic marker is helpful for confirmation. The present study analyzed the expression pattern of SMP30 in mammary carcinoma in humans, dogs, and cats. Immunohistochemistry, immunofluorescence, and western blot analysis were used to investigate SMP30 expression patterns. The expression was specifically observed in neoplastic glandular epithelial cells. The expression increased with the malignancy of glandular epithelial cells with a highly proliferative status. However, SMP30 expression was low in normal mammary gland tissues or well-differentiated adenoma tissues. The patterns were consistently reproduced in canine primary mammary carcinoma cells and MCF-7 and MDA-MB-231 human carcinoma cell lines. This study provides useful information to understand SMP30 expression in various stages of mammary carcinoma and to suggest its utility as a pan-species diagnostic marker, thereby helping to establish strategies for diagnosing mammary carcinoma in several species.     

新工科背景下安全工程专业创新型人才培养路径研究 #br#

为实现新工科背景下安全工程专业创新人才培养目标,基于对创新能力内涵的充分理解,从创新精神、创新意识和创新思维三重角度出发,充分利用“校企协同”育人优势,确定安全工程专业创新型人才培养路径,包括创新型课程体系建设、创新型多维实践平台建设、创新型师资队伍建设及多学科交叉创业活动4条路径。将创新能力培养贯穿于安全工程专业人才培养的全过程,为高校实现创新型人才培养提出建议和参考。