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Nuclear Science and Techniques 2022年第10期33卷 53-67页

作者： Jing Chen ze-shi Liu Hao Jiang Xi-Ren Miao Yong Xu College of Electrical Engineering and Automation Fuzhou UniversityFuzhou 350108China The Department of Automation Shanghai Jiao Tong UniversityShanghai 200240China Fujian Fuqing Nuclear Power Co. Ltd.Fujian 350318China

Anomaly detection for the control rod drive mechanism(CRDM) is key to enhancing the security of nuclear power plant equipment. In CRDM real-time condition-based maintenance, most existing methods cannot deal with long sequences and periodic abnormal events and have poor feature extraction from these data. In this paper,a learning-based anomaly detection method employing a long short-term memory-based autoencoder(LSTM-AE)network and an extreme gradient boosting(XGBoost)algorithm is proposed for the CRDM. The nonlinear and sequential features of the CRDM coil currents can be automatically and efficiently extracted by the LSTM neural units and AE network. The normal behavior LSTM-AE model was established to reconstruct the errors when feeding abnormal coil current signals. The XGBoost algorithm was leveraged to monitor the residuals and identify outliers for the coil currents. The results demonstrate that the proposed anomaly detection method can effectively detect different timing sequence anomalies and provide a more accurate forecasting performance for CRDM coil current signals.

关键词： Anomaly detection CRDM LSTM-AE Residuals XGBoost

Silver dressing in the management of an infant's urachal anomaly infected with methicillin-resistant Staphylococcus aureus:A case report

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World Journal of Clinical Cases 2022年第8期10卷 2629-2636页

作者： ze-Yao shi Shu-Lin Hou Xiao-Wen Li Department of Neonatology Nursing West China Second University HospitalSichuan UniversityChengdu 610041Sichuan ProvinceChina West China School of Nursing Sichuan UniversityChengdu 610041Sichuan ProvinceChina Key Laboratory of Birth Defects and Related Diseases of Women and Children(Sichuan University) Ministry of EducationChengdu 610041Sichuan ProvinceChina

BACKGROUND Symptomatic urachal anomalies are rare *** management of urachal remnants has historically been surgical excision because of the connection between urachal remnants and risk of malignancy development later in ***,recent literature suggests that urachal anomalies that do not extend to the bladder can be treated with conservative *** this case,we report a newborn with an infected urachal remnant who was treated with a combination of antibiotics and a silver-based dressing and finally recovered *** SUMMARY Female baby A,weighing 2.88 kg at 38^(+5) wk of gestational age,was referred to the hospital because of a red,swollen umbilicus approximately 2 cm×2 cm in size with yellow purulent *** physical and ultrasound examination,the baby was finally diagnosed with a urachal *** first used oxacillin to prevent infection for 3 *** the 4^(th) day,microbiology testing of the umbilical exudate revealed the presence of methicillin-resistant Staphylococcus aureus(MRSA).We changed the treatment with oxacillin to vancomycin for systemic infection and treated the umbilical inflammation with a silver sulfate *** 5 d,the symptoms of the umbilicus disappeared,and we discontinued silver dressing *** the 12^(th) day,umbilical exudate testing was negative for *** the 14^(th) day,the baby's blood testing showed a white blood cell count of 14.7×10^(9)/L,neutrophil percentage of 27.8%,and C-reactive protein level of 1.0 mg/L,suggesting that the infection had been *** stopped treatment,and the baby was discharged with no *** this case,the infected urachal anomaly was cured with silver dressing and antibiotic application instead of surgical methods,which was a different course from that of some other urachal remnant *** Anomalies that do not connect with the bladder can be treated with nonoperative management,including application of conservative antibiotics and local i

关键词： Urachal anomaly Infection Neonate Infant Silver dressing Case report

Enhancement of Phenylalanine Ammonia Lyase,Polyphenoloxidase,and Peroxidase in Cucumber Seedlings by Bemisia tabaci (Gennadius) (Hemiptera:Aleyrodidae) Infestation

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Agricultural Sciences in China 2008年第1期7卷 82-87页

作者： ZHANG shi-ze ZHANG Fan HUA Bao-zhen College of Plant Protection Northwest A ＆ F University Yangling 712100 P.R.China Institute of Plant and Environmental Protection Beijing Academy of Agricultural and Forestry Sciences Beijing 100089 P.R.China

In this study, the activities of phenylalanine ammonia lyase （PAL）, polyphenoloxidase （PPO）, and peroxidase （POD） were assayed in cucumber seedlings （Cucumis sativus L.） at 0, 6, 12, 24, 48, 72, and 96 h after they were infested by Bemisia tabaci （Gennadius） using spectrophotometric analysis. The results indicated that herbivore infestation increased the activities of PAL, PPO, and POD. The enzymes showed different activity levels at different times after the infestation. The PAL activity reached the first high peak by 23.1% at 6 h and the highest peak by 29.1% at 48 h compared to the control. The PPO activity reached the first high peak by 22.7% at 6 h and the highest peak by 52.6% at 24 h, and the POD activity reached the highest peak by 213.2% at 6 h and another higher peak value by 135.2% at 96 h. The results suggest that the enhanced activities of the enzymes may contribute to bioprotection of cucumber plants against B. tabaci infestation.

关键词： phenylalanine ammonia lyase polyphenoloxidase peroxidase Bemisia tabaci induce response

Cu-Zn-based alloy/oxide interfaces for enhanced electroreduction of CO_(2) to C_(2+) products

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Journal of Energy Chemistry 2023年第8期83卷 90-97,I0004页

作者： Zi-Yang Zhang Hao Tian Lei Bian shi-ze Liu Yuan Liu Zhong-Li Wang Tianjin Key Laboratory of Applied Catalysis Science&Technology School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China

The electrochemical CO_(2)reduction reaction to produce multi-carbon(C_(2+)) hydrocarbons or oxygenate compounds is a promising route to obtain a renewable fuel of high energy ***,producing C_(2+)at high current densities is still a ***,we develop a Cu-Zn alloy/Cu-Zn aluminate oxide composite electrocatalytic system for enhanced conversion of CO_(2)to C_(2+)*** Cu-Zn-Al-Layered Double Hydroxide(LDH) is used as a precursor to decompose into uniform Cu-Zn oxide/Cu-Zn aluminate *** electrochemical reduction,Cu-Zn oxide generates Cu-Zn alloy while Cu-Zn aluminate oxide remains *** alloy and oxide are closely stacked and arranged alternately,and the aluminate oxide induces the strong electron interaction of Cu,Zn and Al,creating a large number of highly active reaction interfaces composed of 0 to+3 valence metal *** the help of the interface effect,the optimized Cu_(9)Zn_(1)/Cu_(0.8)Zn_(0.2)Al_(2)O_(4)catalyst achieves a Faradaic efficiency of 88.5% for C_(2+)products at a current density of 400 mA cm^(-2)at-1.15 V versus reversible hydrogen *** in-situ Raman and attenuate total reflectance-infrared absorption spectroscopy(ATR-IRAS) spectra show that the aluminate oxide at the interface significantly enhances the adsorption and activation of CO_(2)and the dissociation of H2O and strengthens the adsorption of CO intermediates,and the alloy promotes the C-C coupling to produce C_(2+)*** work provides an efficient strategy to construct highly active reaction interfaces for industrial-scale electrochemical CO_(2)RR.

关键词： Electrochemical CO_(2)reduction reaction C_(2+)products Cu-Zn alloy Cu-Zn aluminate oxide Interface

A Fully Nonlinear HOBEM with the Domain Decomposition Method for Simulation of Wave Propagation and Diffraction

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China Ocean Engineering 2018年第6期32卷 646-654页

作者： JIANG Sheng-chao shi ze-hang SONG Chao ZHANG Gui-yong TANG Guo-qiang School of Naval Architecture State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of Technology Department of Civil and Environmental Engineering National University of Singapore Network and Information Center Dalian University of Technology

A higher-order boundary element method(HOBEM) for simulating the fully nonlinear regular wave propagation and diffraction around a fixed vertical circular cylinder is investigated. The domain decomposition method with continuity conditions enforced on the interfaces between the adjacent sub-domains is implemented for reducing the computational cost. By adjusting the algorithm of iterative procedure on the interfaces, four types of coupling strategies are established, that is, Dirchlet/Dirchlet-Neumman/Neumman(D/D-N/N), Dirchlet-Neumman(D-N),Neumman-Dirchlet(N-D) and Mixed Dirchlet-Neumman/Neumman-Dirchlet(Mixed D-N/N-D). Numerical simulations indicate that the domain decomposition methods can provide accurate results compared with that of the single domain method. According to the comparisons of computational efficiency, the D/D-N/N coupling strategy is recommended for the wave propagation problem. As for the wave-body interaction problem, the Mixed D-N/N-D coupling strategy can obtain the highest computational efficiency.

关键词： fully nonlinear boundary element method domain decomposition method wave propagation wave diffraction

A review on bath fluid flow stirring technologies in EAF steelmaking

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Journal of Iron and Steel Research International 2021年第11期28卷 1341-1351页

作者： Ling-zhi Yang Hang Hu ze-shi Yang Bo-tao Xue Yu-feng Guo Shuai Wang School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083HunanChina Department of Mechanical Engineering National University of SingaporeSingapore 117575Singapore

In the contemporary electric arc furnace(EAF)steelmaking industry,increasing contents and temperature homogenization via fluid flow stirring is found to be an effective method of improving production quality and smelting *** is a trend for different factories with bowl-shaped furnaces to apply the bath fluidity enhancement *** has plenty of advantages in modern steelmaking industry,and the improvements on the EAF steelmaking process have come up with two major tasks,namely reduction in energy consumption and tap-to-tap *** latter task requires an essential understanding of every phase in EAF steelmaking *** flat bath phase with poor bath fluid flow was crucial to the product quality and metallurgical efficiency considering EAF’s bowl-shaped *** research of three stirring bath methods,oxygen jets injection,electromagnetic stirring,and bottom blowing,were introduced,and then the detailed parameters of each method with their influences on molten bath fluidity were presented.

关键词： Electric arc furnace steelmaking Bath fluid flow Stirring technology Oxygen jets injection Electromagnetic stirring Bottom blowing

Characteristics of chemical components in PM2.5 at a plateau city, South-west China

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Frontiers of Environmental Science & Engineering 2016年第5期10卷 97-105页

作者： Jianwu shi Xiang DING Yue ZHOU Ran YOU Lu HUANG Jiming HAO Feng XIANG Jian YANG ze shi Xinyu HAN Ping NING Faculty of Environmental Science and Engineering Kunming University of Science and Technology Kunming 650500 China School of Environment Tsinghua University Beijing 100084 China Yunnan Environmental Monitoring Center Kunming 650000 China Kunming Environmental Monitoring Center Kunming 650228 China

A sampling campaign including summer, autumn and winter of 2014 and spring of 2015 was accomplished to obtain the characteristic of chemical components in PM2.5 at three sites ofKunming, a plateau city in South-west China. Nine kinds of water-soluble inorganic ions （WSI）, organic and element carbon （OC and EC） in PM2.5 were analyzed by ion chromatography and thermal optical reflectance method, respectively. Results showed that the average concentrations of total WSI, OC and EC were 22.85±10.95 μg.m -3, 17.83±9.57 μg.m-3 and 5.114-4.29 μg.m-3, respectively. They totally accounted for 53.0% of PM2.5. Secondary organic and inorganic aerosols （SOA and SIA） were also assessed by the minimum ratio of OC/EC, nitrogen and sulfur oxidation ratios. The annual average concentrations of SOA and SIA totally accounted for 28.3% of the PM2.5 concentration. The low proportion suggested the primary emission was the main source of PM2.5 in Kunming. However, secondary pollution in the plateau city should also not be ignorable, due to the appropriate temperature and strong solar radiation, which can promote the atmospheric photochemical reactions.

关键词： PM2.5 Plateau city Organic carbon Element carbon Inorganic ions Secondary components

Polymerization of 1,3-Butadiene Catalyzed by Cobalt(Ⅱ) and Nickel(Ⅱ) Complexes Bearing Pyridine-2-imidate Ligands

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Chinese Journal of Polymer Science 2016年第9期34卷 1060-1069页

作者： Heng Liu shi-ze Yang Feng Wang Chen-xi Bai 胡雁鸣张学全 Key Laboratory of Synthetic Rubber Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China Panjin Northern Asphalt Co. LtdNorinco GroupPanjin 124000China

Cobalt and nickel complexes （la-ld and 2a-2d, respectively） supported by 2-imidate-pyridine ligands were synthesized and used for 1,3-butadiene polymerization. The complexes were characterized by IR and element analysis, and complex la was further characterized by single-crystal X-ray diffraction. The solid state structure of complex la displayed a distorted tetrahedral geometry. Upon activation with ethylaluminum sesquichloride （EASC）, all the complexes showed high activities toward 1,3-butadiene polymerization. The cobalt complexes produced polymers with high cis-1,4 contents and high molecular weights, while the nickel complexes displayed low cis-l,4 selectivity and the resulting polymers had low molecular weights. The catalytic activities of the complexes highly depended on the ligand structure. With the increment of polymerization temperature, the cis-1,4 content and the molecular weight of the resulting polymer decreased.

关键词： 1,3-Butadiene Late-transition metal Cis-1,4-polybutadiene Pyridine-2-imidate.

Modal analysis of the torque converter in different prestress

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High Technology Letters 2020年第1期26卷 61-67页

作者： Zhang zeyu Hui Jizhuang shi ze Suo Xuefeng Zhang Xuhui Fan Hongwei Key Laboratory of Road Construction Technology and Equipment Ministry of EducationChang'an UniversityXi'an 710064P.R.China Shaanxi Key Laboratory of Mine Electromechanical Equipment Intelligent Monitoring Xi'an University of Science and TechnologyXi'an 710054P.R.China Research Center Tibet Tianlu Co.LtdLhasa 850000P.R.China

In order to study the mechanical properties and the dynamic performance of torque converter,to reduce the vibration and noise during the operation and to improve the stability,a 215 mm hydraulic torque converter is taken as the research object,and modal analyses are performed based on the finite element *** weak parts of the impeller structure are obtained after calculating the models of the impeller and turbine without *** variation of the modal frequency of the turbine and impeller are obtained under different prestress conditions by calculating different rotational speeds of the transmission *** fundamental frequencies of the impeller and the turbine increase by 0.43%and 4.82%respectively when the rotational speed ranges from 100 rpm to 4500 *** results of the present research indicate that the modal frequencies at different speeds are similar to the fundamental frequencies of the ***,it is possible to estimate the vibration characteristics of the structure and optimize the structural design by numerical modal analysis in the static state instead of the dynamic state.

关键词： hydraulic torque converter modal analysis prestress finite element analysis

Melanin synthesis genes BgTH and BgDdc affect body color and cuticle permeability in Blattella germanica

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Insect Science 2022年第6期29卷 1552-1568页

作者： Tian-Tian Bai Xiao-Jin Pei Tong-Xian Liu Yong-Liang Fan shi-ze Zhang State Key Laboratory of Crop Stress Biology for Arid Areas and Key Laboratory of lIntegrated Pest Management on Crops in Northwestern Loess Plateau Ministry of AgricultureNorthwest A&F UniversityYanglingShaanxiChina Present address:Guangdong Provincial Key Laboratory of Insect Developmental Biology and Applied Technology and Institute of Insect Science and Technology School of Life SciencesSouth China Normal UniversityGuangzhou510631China

Melanin is involved in cuticle pigmentation and sclerotization of insects,which is critical for maintaining structural integrity and functional completeness of insect *** 2 key enzymes of tyrosine hydroxylase(TH)and dopa decarboxylase(DDC)predicted in melanin biosynthesis are usually conserved in ***,it is unclear whether their function is related to epidermal *** this study,we identified and cloned the gene sequences of BgTH and BgDdc from Blattella germanica,and revealed that they both showed a high expression at the molting,and BgTH was abundant in the head and integument while BgDdc was expressed highest in the fat *** RNA in-terference(RNAi),we found that knockdown of BgTH caused molting obstacles in some cockroaches,with the survivors showing pale color and softer integuments,while knock-down of BgDdc was viable and generated an abnormal light brown body *** assay showed that the dsBgTH-injected adults died earlier than control groups under a dry atmosphere,but dsBgDdc-injected cockroaches did *** contrast,when dsRNA-treated cockroaches were reared under a high humidity condition,almost no cockroaches died in all ***,with eosin Y staining assay,we found that BgTH-RNAi resulted in a higher cuticular permeability,and BgDdc-RNAi also caused slight dye *** results demonstrate that BgTH and BgDdc function in body pigmentation and affect the waterproofing ability of the cuticle,and the reduction of cuticular perme-ability may be achieved through cuticle melanization.

关键词： cuticular permeability desiccation tolerance dopa decarboxylase German cockroach pigmentation tyrosine hydroxylase