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Effect of Electric Potentials on Microstructure, Corrosion and Wear Characteristic of the Nitrided Layer Prepared on 2Cr13 Stainless Steel by Plasma Nitriding

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Acta Metallurgica Sinica(English Letters) 2019年第6期32卷 733-745页

作者： Yang Li Shang-Zhou Zhang jian-Xun Qiu Yong-Yong He jun-Jie Xiu Qian-Wen Ye Zhong-Li Liu School of nuclear equipment and nuclear engineering Yantai University.Yantai 264005China State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084China

Plasma nitriding is a widely used technology to enhance the surface performance and extend the service life of alloy *** current research mainly focuses on the influences of time,temperature,gas type and pressure parameters on nitriding behavior,while fewer studies have been conducted on the electric *** paper mainly reports the effect of the electric potential on nitriding *** conditions were set using cathodic,anodic and floating potentials in a plasma nitriding furnace.2Cr13 stainless steel was nitrided at 450°C for 5h in an NH3 *** experimental results show that the nitriding treatment can be well performed under the different electric potentials,but differences exist in microstructures,morphologies and performance results of the modified *** thickness and hardness values of the nitrided layer are ranked as follows:cathodic[anodic[floating *** anodic nitrided surface has an obvious particle deposition layer composed of nitrides and *** and tribological experiments show that the corrosion resistance and wear resistance were significantly improved after a nitriding treatment using the three electric ***,the floating nitriding treatment resulted in the best tribological performance and corrosion resistance.

关键词： Nitriding Stainless steel Wear Corrosion

Photochemical properties and source of pollutants during continuous pollution episodes in Beijing, October, 2011

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Journal of Environmental Sciences 2014年第1期26卷 44-53页

作者： jian Gao Yuechong Zhang Meng Zhang Jingqiao Zhang Shulan Wang jun Tao Han Wang Datong Luo Fahe Chai Chun Ren State Key Laboratory of Environmental Criteria Risk Assessment Chinese Research Academy of Environmental Sciences South China Institute of Environmental Sciences Ministry of Environmental Protection

Beijing suffered from serious air pollution in October, 2011 with the occurrence of three continuous episodes. Here we analyze the pollution status of particulate matter, the relationship between the gaseous pollutants, physical and chemical properties of single particles, and the profile of water-soluble ions in PM2.5 during the three episodes. Regional and photochemically aged air masses, which were characterized as having high values of O3 and SO2, were hypothesized to have played a dominant role in the first episode. After mixing local air masses with freshly-emitted primary pollutants, the concentration of NOx continued to increase and the size of SO42-, NO3- and NH4＋ in the particle population continued to become smaller. The amount of elemental carbon-rich and organic carbonrich particles in the scaled single particles （0.2-2 μm） and water-soluble K＋ in PM2.s also increased in the episodes. All the available information suggests that the biomass or fuel burning sources in or around Beijing may have had a huge impact on the last two episodes.

关键词： Beijing particulate matter single particles photochemical property pollution episodes

Gender difference in acquired seizure susceptibility in adult rats after early complex febrile seizures

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Neuroscience Bulletin 2014年第6期30卷 913-922页

作者： Yun-jian Dai Zheng-Hao Xu Bo Feng Ceng-Lin Xu Hua-Wei Zhao deng-Chang Wu Wei-Wei Hu Zhong Chen Department of Pharmacology Key Laboratory of Medical Neurobiology of the Ministry of Health of ChinaZhejiang Province Key Laboratory of NeurobiologyBasic Medical CollegeCollege of Pharmaceutical SciencesZhejiang University Department of Neurology Collaborative Innovation Center for Diagnosis and Treatment of Infectious DiseasesFirst Affiliated HospitalSchool of MedicineZhejiang University

Gender differences are involved in many neurological disorders including epilepsy. However, little is known about the effect of gender difference on the risk of epilepsy in adults with a specific early pathological state such as complex febrile seizures（FSs） in infancy. Here we used a well-established complex FS model in rats and showed that：（1） the susceptibility to seizures induced by hyperthermia, pentylenetetrazol（PTZ）, and maximal electroshock（MES） was similar in male and female rat pups, while males were more susceptible to PTZ- and MES-induced seizures than age-matched females in normal adult rats;（2） adult rats with complex FSs in infancy acquired higher seizure susceptibility than normal rats; importantly, female FS rats were more susceptible to PTZ and MES than male FS rats; and（3） the protein expression of interleukin-1β, an infl ammatory factor associated with seizure susceptibility, was higher in adult FS females than in males, which may reflect a gender-difference phenomenon of seizure susceptibility. Our results provide direct evidence that the acquired seizure susceptibility after complex FSs is gender-dependent.

关键词： gender difference complex febrile seizures seizure susceptibility epilepsy IL-1β

Unravelling the Anomalous Coking Resistance over Boron Nitride-Supported Ni Catalysts for Dry Reforming of Methane

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CCS Chemistry 2023年第9期5卷 2111-2124页

作者： jiang deng Min Gao jun-ya Hasegawa Xiaoyu Zhang Aiyong Wang Aling Chen dengsong Zhang International Joint Laboratory of Catalytic Chemistry College of SciencesShanghai UniversityShanghai 200444 Institute for Chemical Reaction Design and Discovery(WPI-ICReDD) Hokkaido UniversitySapporo 001-0021 Institute for Catalysis Hokkaido UniversitySapporo 001-0021

Metal oxides have been used as the supports for heterogeneous catalysis formany years,but they still suffer from coking in some high-temperature *** main reasons for coking are the uncontrollable dissociation of C-H and the overbalance between carbon deposition and ***,we find a boron nitride(BN)-immobilized Ni catalyst shows unprecedented coking resistance in dry reforming of methane via the incomplete decomposition of *** the Ni-based catalysts supported by traditional metal oxides,BN-supported Ni accelerates the first C-H dissociation while inhibiting the breaking of the final C-H bond;hence,the suppression of the complete decomposition of methane thoroughly addresses the coking *** work reveals the fundamental reason for the coking resistance over BN-supported Ni catalysts is selective activation of the C-H bond,which can provide an inspiring idea for other applications.

关键词： heterogenous catalysis boron nitrides dry reforming of methane coking resistance methane conversion

基于CANDU型核电站的高精度线性电源分析设计

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电工技术 2024年第8期 34-38,42页

作者：印健邓爱民王学智王旭王灿张皓然何亚波中核核电运行管理有限公司浙江嘉兴314300

40 V仪用直流电源国产化势在必行。在对电源应用场景和性能指标深入分析的基础上,设计出一款具有高可靠性、高性能、符合人机交互工学界面等特点的电源,第三方核级抗震试验、型式试验、老化试验、EMC试验结果表明该款40 V仪用直流电源... 详细信息

40 V仪用直流电源国产化势在必行。在对电源应用场景和性能指标深入分析的基础上,设计出一款具有高可靠性、高性能、符合人机交互工学界面等特点的电源,第三方核级抗震试验、型式试验、老化试验、EMC试验结果表明该款40 V仪用直流电源的各项指标可完全比拟原用国外产品,并在电源安全防护和人机交互方面具有更好的性能。

关键词：核电站仪用电源高精度高可靠性数字化国产化

Design method for freeform reflective-imaging systems with low surface-figure-error sensitivity

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Chinese Optics Letters 2019年第9期17卷 83-88页

作者： Yuting deng Guofan Jin jun Zhu State Key Laboratory of Precision Measurements Technology and Instruments Department of Precision InstrumentTsinghua University

Freeform surfaces are difficult to manufacture due to their lack of rotational symmetry. To reduce the requirements for manufacturing precision, a design method is proposed for freeform reflective-imaging systems with low surfacefigure-error sensitivity. The method considers both the surface-figure-error sensitivity and optical specifications,which can design initial systems insensitive to surface figure errors. Design starts with an initial planar system;the surface-figure-error sensitivity of the system is reduced during construction. The proposed method and another that is irrelevant to figure-error sensitivity are used to design a freeform off-axis three-mirror imaging *** of the sensitivities of the two systems indicates the superiority of our proposed method.

关键词： Design method freeform reflective-imaging systems low surface-figure-error sensitivity

An Injectable Hydrogel with or without Drugs for Prevention of Epidural Scar Adhesion after Laminectomy in Rats

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Chinese Journal of Polymer Science 2016年第2期34卷 147-163页

作者： Lin Chen Xiang-qian Li Lu-ping Cao Xi-lei Li jun-rong Meng 董健俞麟 jian-dong Ding State Key Laboratory of Molecular Engineering of Polymers&Department of Macromolecular Science Fudan UniversityShanghai 200433China Department of Orthopaedic Surgery Zhongshan HospitalFudan UniversityShanghai 200032China

Epidural scarring occurs inevitably in the defect after spinal laminectomy, and thus how to prevent or reduce it becomes a challenging topic. In the present study, an injectable hydrogel and its dexamethasone （DEX）-loaded hydrogel systems were adopted to prevent epidural scarring in a postlaminectomy rat model. The hydrogel system composed of poly（D,L-lactic acid-co-glycolic acid）-poly（ethylene glycol）-poly（D,L-lactic acid-co-glycolic acid）（PLGA-PEG-PLGA） triblock copolymers was a free-flowing sol at room temperature, and spontaneously turned into a semi-solid gel at body temperature. A lumbar 3 total laminectomy was performed on Sprague Dawley （SD） rats, and the efficacy of the injectable hydrogel with or without drugs in preventing epidural scar formation was evaluated via the gross anatomical observation and histological examination at one month post-surgery. The results demonstrate that the use of hydrogel alone reduced epidural scarring significantly, whereas the efficacy of the DEX-loaded hydrogels presented an irregular dose-dependency of drug and even the inappropriate drug doses resulted in the negative results. Therefore, the present study confirms that the PLGA-PEG- PLGA hydrogel holds potential as a barrier device to decrease peridural scarring, and reveals that the sustained delivery of the steroid hormone DEX to prevent surgery-related adhesions in the laminectomy defect is complex. Moreover, our in vivo studies also remind the researchers to pay attention to the irregular dose-dependency of the hormone drugs.

关键词： Thermo-reversible hydrogel Epidural scarring Laminectomy Steroid hormone.

Comprehensive Analysis of Key mRNAs and lncRNAs in Osteosarcoma Response to Preoperative Chemotherapy with Prognostic Values

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Current Medical Science 2021年第5期41卷 916-929页

作者： Mi LI Wei-ting CHENG Hao LI Zhi ZHANG Xiao-li LU Si-si deng jian LI Cai-hong YANG Department of Orthopedics Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030China Oncology Department Wuhan No.1 Hospital Wuhan 430030China Cancer Center Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430022China Institute of Experimental Immunology University Clinic of Rheinische Friedrich-Wilhelms-UniversityBonn D-53127Germany

Objective:Osteosarcoma is one of the most common types of bone sarcoma with a poor ***,identifying the predictive factors that contribute to the response to neoadjuvant chemotherapy remains a significant ***:A public data series(GSE87437)was downloaded to identify differentially expressed genes(DEGs)and differentially expressed lncRNAs(DElncRNAs)between osteosarcoma patients that do and do not respond to preoperative ***,functional analysis of the transcriptome expression profile,regulatory networks of DEGs and DElncRNAs,competing endogenous RNAs(ceRNA)and protein-protein interaction networks were ***,the function,pathway,and survival analysis of hub genes was performed and drug and disease relationship prediction of DElncRNA was carried ***:A total of 626 DEGs,26 DElncRNAs,and 18 hub genes were ***,only one gene and two lncRNAs were found to be suitable as candidate gene and lncRNAs ***:The DEGs,hub genes,candidate gene,and candidate lncRNAs screened out in this context were considered as potential biomarkers for the response to neoadjuvant chemotherapy of osteosarcoma.

关键词： osteosarcoma preoperative chemotherapy competing endogenous RNAs differentially expressed genes survival analysis

一种基于TrustZone机制的安全加解密及存储系统设计

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广西水利水电 2024年第4期 124-127,132页

作者：梁祖丹龙荣平陆彬陶健军广西水利电力勘测设计研究院有限责任公司南宁530023

针对传统加解密技术在安全存储领域面临的挑战,提出了一种基于TrustZone机制的安全加解密以及存储系统设计。TrustZone是一种硬件安全技术,它通过在处理器中集成安全内核,为用户提供一个安全执行环境。在TrustZone环境下,应用程序可以... 详细信息

针对传统加解密技术在安全存储领域面临的挑战,提出了一种基于TrustZone机制的安全加解密以及存储系统设计。TrustZone是一种硬件安全技术,它通过在处理器中集成安全内核,为用户提供一个安全执行环境。在TrustZone环境下,应用程序可以执行安全敏感操作,如密钥管理和加密算法实现等。详细介绍了该方案的设计、安全加解密流程和应用场景,并对方案安全性分析和评估。实验结果验证了本方案系统的安全性能和效率,展示了与传统加解密方法对比的优越性,为加解密技术的研究和发展提供了新思路。

关键词：安全加解密 TrustZone机制安全架构密钥管理加解密算法硬件加密防篡改