丁腈胶乳的加氢反应

采用水合肼/过氧化氢氧化还原体系，以硼酸为催化剂，在常压下进行丁腈胶乳的氢化反应，研究了过氧化氢加入方式，硼酸和水合肼用量，反应温度及反应时间对丁腈胶乳加氢度的影响。结果表明，过氧化氢连续滴加再附加室温条件，氢化反应效果最好。当硼酸用量为2.64mmol，水合肼用量为95.2mmol，过氧化氮用量为79.3mmol。在60℃，6h下，丁腈胶乳的加氢度可达到90%以上。     

Assessment of a redox alkaline/iron-chelate absorption process for the removal of dilute hydrogen sulfide in air emissions

The oxidative absorption of hydrogen sulfide (H₂S) into a solution of ferric chelate of trans-1,2- diaminocyclohexanetetraacetate (CDTA) was studied in a counter-current laboratory column randomly packed with 15 mm plastic Ralu rings. The present investigation takes concern about the Kraft pulping situation where dilute H₂S concentrations are omnipresent in large-volume gas effluents. A fractional two-level factorial approach was instigated to determine the significance of six operating variables, namely the solution's alkalinity (pH; 8.5-10.5), the liquid mass flow rate (L;1.73-), the solution's ionic strength (I_C;0.01-), the gas mass flow rate (G;0.19-), the inlet H₂S concentration (C_H2S,0;70-430 ppm) and the initial ferric CDTA concentration (C_Fe,0;100 -). Initially, a Plackett-Burman design matrix of seven duplicated experiments revealed that pH is the leading factor controlling the H₂S conversion rate while the ionic strength and ferric CDTA concentration effects remained negligible within the factorial domain. Surface response analysis based on 11 duplicated factorial experiments plus 10 central composite trials revealed that the H₂S conversion significantly increases with liquid flow rate but decreases with growing H₂S load up. Further examination about the influence of ferric CDTA on H₂S absorption rate was set up over a broader concentration range (C_Fe,0;0- at pH of 9.5 and 10.5. It showed good potential at as H₂S conversion increased by a significant 25% for both pH values in comparison to pure alkaline solutions containing no ferric CDTA.     

Prediction of dispersed phase holdup in a modified multi‐stage bubble column scrubber

This paper reports on the experimental investigation carried out to evaluate fractional dispersed phase holdup for a gas‐liquid mixture in a modified multi‐stage bubble column (with contraction and expansion disks), which has been conceived, designed and fabricated as a wet scrubber for control of air pollution; in addition it has versatile use as a gas‐liquid contactor in chemical process industries. A correlation developed for predicting fractional dispersed phase holdup has been found to be encouraging and highly significant from statistical analysis.     

高校无线网络的设计与实现

目前,随着高校信息化建设的逐步深入和无线技术的日渐成熟,很多重要应用都顺势承载在无线网上,促使高校原有业务不断被优化,新兴业务迅速地产生.因此,构建高效、易用、安全的校园无线网络,对于高校信息化发展、智慧校园的引入具有重要的意义.介绍了基于IEEE 802.11ac协议的高校无线网络设计方案,呈现了不同应用场景的设备选型及实现过程,着重讨论了无线架构、无线控制器的转发模式以及冗余方案、智能无感知认证、三层漫游,AP智能负载均衡等无线网络建设过程中所运用的成熟、先进技术.该方案实施后,校园无线网络实现全面覆盖,快速推动了高校信息化建设.     

PLC在接触器试验中的应用

本文介绍了对交流接触器按照UL认证标准,采用PLC进行过载耐久试验,提高了试验的可靠性和试验的自动化程度。     

交流接触器动作范围验证试验

本文描述了交流接触器动作特性试验方法，以及在 40℃时吸合电压的模拟试验方法和-5℃时吸合电压的模拟试验方法和-5℃时释放电压的换算方法。     

Suboptimal robust synthesis for MIMO plant under coprime factor perturbations

Suboptimal robust synthesis for MIMO nominal system under coprime factor perturbations is considered in classical and non-classical statements. In the classical statement, weights of perturbations and upper bound on magnitude bounded exogenous disturbance are assumed to be known to controller designer. Suboptimal synthesis within ε tolerance is reduced to the solution of log₂(1/ε) standard mixed sensitivity problems of ℓ₁ optimization. In the non-classical statement, the upper bounds on perturbations and exogenous disturbance are to be estimated from measurement data and suboptimal synthesis is reduced to the solution of 1/ε mixed sensitivity problems.     

A single-phase p-type ac–ac converter with reduced components count and high boost factor

This paper proposes a new single-phase direct step-up ac–ac converter by modifying the p-type impedance source. It provides a high boost factor as well as high efficiency, while only six parts are required to design it, involving just two bidirectional power switches. A safe commutation method has been applied to power switches to make the converter snubber-free and high efficient. Input and output harmonic filters are no longer required since input and output currents variate continuously with small ripple and low total harmonic distortion (THD). The proposed topology only modulates the output voltage amplitude, not the phase and frequency, so the output frequency is identical to the input frequency and constant. Thus, it can be utilized in step-up conversion applications, like inductive power transmission from low ac voltage sources. Input and output have the same ground, which is a good protective feature. In this paper, the operating principle of the converter is demonstrated. Experimental results have been represented to evaluate the performance of the converter. For this purpose, an experimental prototype has been fabricated. Results are investigated and compared with other previous step-up ac–ac converters. Results confirm the theory, operating principle, and performance of the converter.     

飞机电源系统中典型功率器件健康状态预测技术研究

为掌握某型战机电源系统中典型功率器件对机载产品运行可靠性的影响程度,针对目前机载维修中功率器件失效导致的故障占比越来越高的现状,基于对接触器实际工作环境的分析,选取能表征接触器性能退化过程的特征参数,搭建了特征参数采集软硬件平台,并为2种型号的接触器分别制定了自动测试方案,实现对特征参数数据的实时采集。在此基础上,开展接触器三维建模和有限元仿真,最后构建了接触器的退化模型,即接触器超程时间和接触器寿命的数学模型,为后续新机中含类似器件的机载产品测试和修理提供了技术支撑。     

Electrohydrodynamic‐Induced SERS Immunoassay for Extensive Multiplexed Biomarker Sensing

Cancer diagnosis and patient monitoring require sensitive and simultaneous measurement of multiple cancer biomarkers considering that single biomarker analysis present inadequate information on the underlying biological transformations. Thus, development of sensitive and selective assays for multiple biomarker detection might improve clinical diagnosis and expedite the treatment process. Herein, a microfluidic platform for the rapid, sensitive, and parallel detection of multiple cancer‐specific protein biomarkers from complex biological samples is presented. This approach utilizes alternating current electrohydrodynamic‐induced surface shear forces that provide exquisite control over fluid flow thereby enhancing target–sensor interactions and minimizing non‐specific binding. Further, the use of surface‐enhanced Raman scattering‐based spectral encoding with individual barcodes for different targets enables specific and simultaneous detection of captured protein biomarkers. Using this approach, the specific and sensitive detection of clinically relevant biomarkers including human epidermal growth factor receptor 2 (HER2); Mucin 1, cell surface associated (MUC1); epidermal growth factor receptor; and Mucin 16, cell surface associated (MUC16) at concentrations as low as 10 fg mL^?1 in patient serum is demonstrated. Successful target detection from patient samples further demonstrates the potential of this current approach for the clinical diagnosis, which envisages a clinical translation for a rapid and sensitive appraisal of clinical samples in cancer diagnostics.