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Risk analysis for a cascade reservoir system using the brittle risk entropy method

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Science China(Technological Sciences) 2016年第6期59卷 882-887页

作者： YANG Yin REN Qing wen tian Ying XIONG Yao College of Hydraulic Conservation and Hydropower Engineering Hohai University Department of Engineering Mechanics Hohai University

The principal means of conserving water and utilizing hydropower in China is to exploit the use of a series of reservoirs in a cascade. This method and its inherent engineering safety problems are receiving increasing attention nowadays. In the field of engineering safety analysis, much work has focused on single reservoir projects in the past few years, but there is little research available on the safety risk analysis of cascade reservoirs, either within China or internationally. Therefore, a framework for risk analysis on the cascade reservoir system based on the theory of system engineering is constructed in this article. A cascading failure model is established and the connection degree factor discussed. In addition, the importance degree of the subsystem, which can be calculated by combining the analytical hierarchy process and the entropy weight method, is explained. According to brittleness theory of a complex system, brittle risk entropy is proposed as a performance index for measuring the collapse uncertainty of the cascade reservoir system. In addition, the brittle risk of the cascade reservoir system is predicted, which provides a reference for safety analysis in water conservation and hydropower construction projects in China.

关键词： cascading failure model safety analysis risk assessment complex system brittle risk entropy

GmNMH7, a MADS-box transcription factor, inhibits root development and nodulation of soybean(Glycine max [L.] Merr.)

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Journal of Integrative Agriculture 2019年第3期18卷 553-562页

作者： MA wen-ya LIU Wei hou wen-sheng SUN Shi JIANG Bing-jun HAN tian-fu FENG Yong-jun WU Cun-xiang Key Laboratory of Soybean Biology(Beijing) Ministry of Agriculture/Institute of Crop SciencesChinese Academy of Agricultural SciencesBeijing 100081P.R.China School of Life Science Beijing Institute of TechnologyBeijing 100081P.R.China

As an important food crop and oil crop, soybean(Glycine max [L.] Merr.) is capable of nitrogen-fixing by root nodule. Previous studies showed that GmNMH7, a transcription factor of MADS-box family, is associated with nodule development, but its specific function remained unknown. In this study, we found that GmN MH7 was specifically expressed in root and nodule and the expression pattern of GmNMH7 was similar to several genes involved in early development of nodule(GmENOD40-1, GmENOD40-2, GmNFR1 a, GmNFR5 a, and GmNIN) after rhizobia inoculation. The earlier expression peak of GmNMH7 compared to the other genes(GmENOD40-1, GmENOD40-2, GmNFR1 a, GmNFR5 a, and GmNIN) indicated that the gene is related to the nod factor(NF) signaling pathway and functions at the early development of nodule. Over-expression of GmNMH7 in hairy roots significantly reduced the nodule number and the root length. In the transgenic hairy roots, overexpression of GmN MH7 significantly down-regulated the expression levels of GmE NOD40-1, GmE NOD40-2, and GmN FR5α. Moreover, the expression of GmNMH7 could respond to abscisic acid(ABA) and gibberellin(GA_3) treatment in the root of Zigongdongdou seedlings. Over-expressing GmNMH7 gene reduced the content of ABA, and increased the content of GA_3 in the positive transgenic hairy roots. Therefore, we concluded that GmNMH7 might participate in the NF signaling pathway and negatively regulate nodulation probably through regulating the content of GA_3.

关键词： soybean GmNMH7 MADS-box gene nodulation ABA GA3

Effort-aware cross-project just-in-time defect prediction framework for mobile apps

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Frontiers of Computer Science 2022年第6期16卷 15-29页

作者： tian CHENG Kunsong ZHAO Song SUN Muhammad MATEEN Junhao wen School of Big Data and Software Engineering Chongqing UniversityChongqing401331China School of Computer Science Wuhan UniversityWuhan430072China Department of Computer Science Air University Multan CampusMultan60000Pakistan

As the boom of mobile devices,Android mobile apps play an irreplaceable roles in people’s daily life,which have the characteristics of frequent updates involving in many code commits to meet new ***-in-Time(JIT)defect prediction aims to identify whether the commit instances will bring defects into the new release of apps and provides immediate feedback to developers,which is more suitable to mobile *** the within-app defect prediction needs sufficient historical data to label the commit instances,which is inadequate in practice,one alternative method is to use the cross-project *** this work,we propose a novel method,called KAL,for cross-project JIT defect prediction task in the context of Android mobile *** specifically,KAL first transforms the commit instances into a high-dimensional feature space using kernel-based principal component analysis technique to obtain the representative ***,the adversarial learning technique is used to extract the common feature embedding for the model *** conduct experiments on 14 Android mobile apps and employ four effort-aware indicators for performance *** results on 182 cross-project pairs demonstrate that our proposed KAL method obtains better performance than 20 comparative methods.

关键词： kernel-based principal component analysis adversarial learning just-in-time defect prediction cross-project model

What can we learn from neonates with COVID-19?

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World Journal of Pediatrics 2020年第3期16卷 280-283页

作者： tian-tian Xiao Kai Yan Lai-Shuan Wang wen-Hao Zhou National Clinical Research Center for Children's Hospital of Fudan University ShanghaiChina Department of Neonatology Children's Hospital of Fudan University399 Wanyuan RoadShanghai 201102China

The coronavirus disease 2019 (COVID-19) caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has become a global *** on epidemiological and clinical characteristics of patients with COVID-19 have indicated that children are susceptible to SARS-CoV-2 [1-3].To date,the largest study in China reported that over 90% of 2143 children with COVID-19 were asymptomatic,or had mild or moderate illness,and that 5.8% presented critical illness [3].Although the data of neonates are limited and only six neonates with COVID-19 have been reported thus far,several important points should be addressed from these neonatal cases.

关键词： acute respiratory nates

Blue Electroluminescent Diodes Utilizing Blend of Poly (2,5-Dibutoxyphenylene) in Poly (N-Vinylcarbazole)

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Chinese Physics Letters 1996年第12期13卷 944-946页

作者： HUANG Jing-song ZHANG Hai-feng AN Hai-yan tian wen-jing hou Jing-ying CHEN Bai-jun LIU Shi-yong SHEN Jia-cong National Laboratory of Integrated Optoelectronics Jilin UniversityChangchun 130023 Key Laboratory of Molecular Spectra and Molelcular Structure Jilin UniversityChangchun 130023

Blue emission from polymer blends composed of poly(2,5-dibutoxyphenyiene)(PPP)in a matrix polymer poly(N-vinylcarbazole)(PVK)is *** light-emitting layer can be fabricated by spin-coating of PPP-PVK blend solution without subsequent processing or heat treatment.A cell structure of glass substrate/indium-tin-oxide/PPP-PVK blend/aluminum is *** light emission with a peak position at 448nm occurs at a bias of about 8V.

关键词： carbazole subsequent blends

Oxygen vacancy enhanced biomimetic superoxide dismutase activity of CeO_(2)-Gd nanozymes

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Journal of Rare Earths 2021年第9期39卷 1108-1116页

作者： Xiangcheng Shi Jingjie Yang Xintong wen Fuii tian Changyan Li College of Chemistry and Chemical Engineering Inner Mongolia UniversityHohhot010021China Department of Chemistry National University of Singapore.Singapore 117543Singapore Key Laboratory of Medicinal and Edible Plants Resources of Hainan Province Hainan Vocational University of Science and TechnologyHaikou 571126China

Cerium oxide-based nanozymes have recently drawn much attention in the field of biomedical and antioxidant applications,because of their unique regenerative or autocatalytic ***,we studied the biomimetic superoxide dismutase(SOD)nanozymes CeO_(2)-Gd that combines the fluorescence properties of rare earth Gd with the antioxidant properties of CeO_(2)nanoparticles,which was prepared via facile *** structure and composition of the CeO_(2)-Gd were measured and verified by X-ray powder diffraction(XRD),Raman spectroscopy,transmission electron microscopy(TEM),energydispersive X-ray spectroscopy(EDX),and X-ray electron spectroscopy(XPS).Confocal microscopy was used to image *** performance and cell viability of these nanozymes were measured in vitro using BGC-803 ***_(2)-Gd nanozymes with a higher Ce^(3+)/Ce^(4+)ratio show higher superoxide dismutase(SOD)mimetic *** antioxidant activity and fluorescence properties of CeO_(2)-Gd in BGC-803 cancer cells are enhanced by oxygen vacancies generated by doping rare-earth elements *** work may guide the future design of CeO_(2)-Gd-based biomimetic nanozymes for anticancer and antioxidant applications.

关键词： Antioxidant enzyme CeO_(2)-Gd nanozymes Superoxide dismutase Biomimetic nanozymes Oxygen vacancy Rare earths

Secondary and activated X(γ)radiation of SPHIC particle therapy facility

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Nuclear Science and Techniques 2021年第4期32卷 84-91页

作者： Wei-Ming Sun Ning Du wen-Dong tian Lan Wang Department of Medical Management Shanghai Proton and Heavy Ion CenterShanghai Engineering Research Center of Proton and Heavy Ion Radiation TherapyShanghai 201315China Siemens Healthineers Ltd. Shanghai 201321China

We report the secondary X(γ)radiation from the accelerator in a normal operating state and activated X(γ)radiation from the accelerator devices when the accelerator stops operating in the cancer treatment facility of the Shanghai Proton and Heavy Ion Center(SPHIC).These radiation measurements show us the structural radiation distribution along the beam lines and devices inside the accelerator room when the beam is on and off and can support the radiation protection design of the accelerator facility used for cancer treatment and help evaluate the accumulated radiation dose in the case of an emergency,such as a personal safety system failure or a radiation *** radiation dose rate measured in this facility shows that the facility is safe from the radiation protection *** shooting the quality assurance(QA)beam,the radiation dose rate in the treatment room was also measured to investigate the radiation dose space distribution and decay time *** addition,the time period before safely entering the treatment room after determining the shooting of the QA beam is recommended to be approximately 5 min.

关键词： Secondary radiation Activated radiation Nuclear safety and radiation protection Dose rate Accelerator

An analytical model of hot rolling force for a thick plate by combining globally optimal approximation yield criterion and egg-circular velocity field

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Journal of Iron and Steel Research International 2024年第3期31卷 647-659页

作者： Shun-hu Zhang Yi Zhang wen-hao tian Yan Li Shagang School of Iron and Steel Soochow UniversitySuzhou 215021JiangsuChina

For the sake of solving the problem that it is difficult to be integrated for the Mises specific plastic power due to its nonlinearity,a new linear criterion,named the globally optimal approximation criterion,is constructed by the polygonal approximation to the Mises *** new criterion is proved to be the linear function of the principal stress componentsσ1,σ2 andσ3 and the trajectory of it on theπ-plane is a non-equiangular but equilateral dodecagon intersecting the Mises *** theoretical results of the current criterion described by the Lode stress parameters are in excellent accordance with the experimental ***,according to the trend that the metallic flow velocity between rollers aggrandizes gradually from the inlet to the outlet during the hot rolling of a thick plate,a biomimetic velocity field is proposed in which the horizontal velocity component fits the egg-circular curve *** velocity field and its simulated results agree quite ***,using the determined linear criterion,energy analysis of the constructed velocity field is utilized to obtain the interior deformation power,while the vector decomposition approach is utilized to obtain the frictional power and shear *** this basis,the overall power is obtained and the analytical solutions are generated for the rolling torque,rolling force and the coefficient of the stress state under different egg curves by minimizing the neutral ***,the parameter optimization of the characteristic parameterρwhich affects the slope of the egg-circular curve is carried out and the best egg-circular curve which can minimize the energy consumption is *** best agreement between the theoretical and observed values of rolling force and rolling torque is under this curve,and the mean relative errors of the rolling torque and rolling force are no more than 2.93%,while the maximum error is no more than 8.35%.

关键词： Yield criterion Plastic deformation Rolling force Velocity field Analytical solution

The weeping characteristic of submerged multi-orifice plate

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Chinese Journal of Chemical Engineering 2020年第4期28卷 955-968页

作者： Jiming wen Ruifeng tian Sichao Tan Qiunan Sun Haifeng Gu Fundamental Science on Nuclear Safety and Simulation Technology Laboratory Harbin Engineering UniversityHarbin 150001China

Weeping is an adverse phenomenon which results in higher pressure drop and poorer aeration *** experiments have been conducted to study the mechanism by which weeping impairs the work performance of multi-orifice plate.A theoretical model is improved to analyze the weeping phenomenon of multiorifice plate based on potential flow *** relations of different bubbling conditions and weeping rate are *** condition and average weeping rate have relation with the driven pressure differential and dynamic variation of gas chamber *** addition,a set of experiments are designed to study the influence of various factors on weeping *** bubble coalescence during bubble formation is a fatal factor determining weeping rate,so the relation between weeping rate and gas flow rate is concerned with the pitch of orifices and orifice *** is a critical plate thickness which is in favor of weeping.

关键词： Weeping Multi-orifice plate Wave pressure Gas chamber pressure