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Photocatalytic activation of sulfite by N-doped porous biochar/MnFe_(2)O_(4) interface-driven catalyst for efficient degradation of tetracycline

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Green Energy & Environment 2024年第3期9卷 481-494页

作者： Long cheng Yuanhui Ji Jiangsu Province Hi-Tech Key Laboratory for Biomedical Research School of Chemistry and Chemical EngineeringSoutheast UniversityNanjing211189China

A novel photo-catalytic system composed of N-doped biochars(NBCs),MnFe_(2)O_(4) and sulfite activation under ultraviolet(NBCs/MnFe_(2)O_(4)/sulfite/UV)was constructed to realize the efficient eliminate of tetracycline(TC).As the carrier of MnFe_(2)O_(4),NBCs were synthesized from alfalfa,which has large specific surface area,graphite like structure and hierarchical porous *** adsorption isotherm indicated that NBCs/MnFe_(2)O_(4)-2:1 had the best adsorption performance for TC(347.56 mg g^(-1)).Through synergistic adsorption and photocatalysis,the removal rate of TC reached 84%,which was significantly higher than that of MnFe_(2)O_(4).Electrochemical impedance spectroscopy(EIS)and Photoluminescence(PL)characterization results showed that the introduction of NBCs improved the separation efficiency of photogenerated electron and hole pairs and enhanced the photocatalytic ***,the adsorption,degradation mechanism and degradation path of TC by the catalyst were systematically analyzed by coupling HPLC–MS measurement with the theoretical *** the advantages of excellent degradation performance,low cost,easy separation and environmental friendliness of NBCs/MnFe_(2)O_(4),this work was expected to provide a new path for the practical application of biochar.

关键词： Biochar MnFe_(2)O_(4) Sulfite Adsorption Photocatalysis

An improved initial rotor position estimation method using high-frequency pulsating voltage injection for PMSM

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Defence Technology（防务技术） 2024年第3期33卷 19-29页

作者： Yang Jiang Ming cheng School of Electrical Engineering Southeast UniversityNanjing 210096China

High frequency pulsating voltage injection method is a good candidate for detecting the initial rotor position of permanent magnet synchronous ***,traditional methods require a large number of filters,which leads to the deterioration of system stability and dynamic *** order to solve these problems,a new signal demodulation method is proposed in this *** proposed new method can directly obtain the amplitude of high-frequency current,thus eliminating the use of filters,improving system stability and dynamic performance and saving the work of adjusting filter *** addition,a new magnetic polarity detection method is proposed,which is robust to current measurement ***,experiments verify the effectiveness of the method.

关键词： Initial position detection Signal demodulation algorithm Magnetic polarity detection Filter elimination

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既有旧楼改造承载力检测及加固评定技术研究

科学技术创新 2023年第21期 132-136页

作者：程沙沙广西建设职业技术学院广西南宁

既有旧楼改扩建时需对其承载力进行有效校核,因许构件年代较为久远,构件强度检测存在一定的局限性,故很难通过有效的方式确定既有旧楼构件的承载能力计算。为解决该类问题,首先需通过现有的检测手段对既有旧楼的地基承载力、结构强度及... 详细信息

既有旧楼改扩建时需对其承载力进行有效校核,因许构件年代较为久远,构件强度检测存在一定的局限性,故很难通过有效的方式确定既有旧楼构件的承载能力计算。为解决该类问题,首先需通过现有的检测手段对既有旧楼的地基承载力、结构强度及裂缝、结构尺寸以及建筑物的垂直度进行多个样本检测,并通过样本点的正态分布,确定满足95%概率情况下的承载力临界值作为其承载力标准值,再将承载力标准值与结构荷载永久效应值进行比较以确定其结构的可靠度,最后将二者进行比较以评定其安全等级,同时根据不同的安全等级选取不同的加固方式。研究表明,通过对既有旧楼的各构件进行多样本检测,并通过正态分布概率函数确定的标准值可有效的代表既有旧楼的各构件承载力。基于该承载力的评定加固方式有效的保证了既有旧楼改扩建所需的安全措施,该方法可行,实现了旧楼改造经济效应。

关键词：既有旧楼改扩建检测正态分布承载力

Reliability of a Multicomponent Stress-strength Model Based on a Bivariate Kumaraswamy Distribution with Censored Data

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Acta Mathematicae Applicatae Sinica 2024年第2期40卷 478-507页

作者： Cong-hua cheng School of Mathematics and Statistics Zhaoqing UniversityZhaoqing 526061China

In this paper,we consider a system which has k statistically independent and identically distributed strength components and each component is constructed by a pair of statistically dependent elements with doubly type-II censored *** elements(X1,Y1),(X2,Y2),…,(Xk,Yk)follow a bivariate Kumaraswamy distribution and each element is exposed to a common random stress T which follows a Kumaraswamy *** system is regarded as operating only if at least s out of k(1≤s≤k)strength variables exceed the random *** multicomponent reliability of the system is given by Rs,k=P(at least s of the(Z1,…,Zk)exceed T)where Zi=min(Xi,Yi),i=1,…,*** Bayes estimates of Rs,k have been developed by using the Markov Chain Monte Carlo methods due to the lack of explicit *** uniformly minimum variance unbiased and exact Bayes estimates of Rs,k are obtained analytically when the common second shape parameter is *** asymptotic confidence interval and the highest probability density credible interval are constructed for Rs,*** reliability estimators are compared by using the estimated risks through Monte Carlo simulations.

关键词： stress-strength model bivariate Kumaraswamy distribution multicomponent reliability doubly Type-II censored scheme interval estimation

工作压力对高校辅导员职业枯竭的影响——基于福州四所高校的实证调研

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福建商学院学报 2019年第1期 77-83页

作者：程莎莎福建江夏学院工商管理学院福建福州350108

高校辅导员承担着个人、学生、组织等众多对象施加的工作压力,是职业枯竭症的高发群体,工作压力影响辅导员的身心健康和思想政治教育工作的顺利开展。对福州四所高校的辅导员进行问卷调查,实证分析工作压力对高校辅导员职业枯竭的影响... 详细信息

高校辅导员承担着个人、学生、组织等众多对象施加的工作压力,是职业枯竭症的高发群体,工作压力影响辅导员的身心健康和思想政治教育工作的顺利开展。对福州四所高校的辅导员进行问卷调查,实证分析工作压力对高校辅导员职业枯竭的影响。结果表明:角色冲突和工作负荷是导致辅导员职业枯竭的主要工作压力,个体特征差异也会影响辅导员职业枯竭和工作压力的调节效果。研究结论对缓解高校辅导员职业枯竭和工作压力提供了有益的思路。

关键词：高校辅导员职业枯竭工作压力

新中国成立初期的“五四”纪念研究(1949年-1966年)

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中北大学学报（社会科学版） 2021年第4期37卷 126-131,137页

作者：程莎莎湖南大学岳麓书院湖南长沙410000

新中国成立后的17年(1949年-1966年)间大规模的"五四"纪念从未间断,它的形式可以分为纪念活动和纪念文本两大类。纪念活动分为各种类型的集会和文体比赛;纪念文本分为官方重要领导人讲话和社论、民间对"五四"的回忆与评价等。以这些纪... 详细信息

新中国成立后的17年(1949年-1966年)间大规模的"五四"纪念从未间断,它的形式可以分为纪念活动和纪念文本两大类。纪念活动分为各种类型的集会和文体比赛;纪念文本分为官方重要领导人讲话和社论、民间对"五四"的回忆与评价等。以这些纪念形式为基础的"五四"纪念承载着多重功能:在政治上表达着国家与政党的诉求,在文化上起着教化和指导的作用,在社会上起着动员与整合的价值。

关键词：中国共产党 “五四”纪念形式功能

A historical review of hybrid rice breeding

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Journal of Integrative Plant Biology 2024年第3期66卷 532-545页

作者： Xiaoming Zheng Fei Wei cheng cheng Qian Qian State Key Laboratory of Crop Gene Resources and Breeding Institute of Crop SciencesChinese Academy of Agricultural SciencesBeijing 100081China Yazhouwan National Laboratory Sanya City 572024China

The development of germplasm resources and advances in breeding methods have led to steady increases in yield and quality of rice (Oryza sativa L.). Three milestones in the recent history of rice breeding have contributed to these increases: dwarf rice breeding, hybrid rice breeding, and super rice breeding. On the 50th anniversary of the success of three-line hybrid rice,we highlight important scientific discoveries in rice breeding that were made by Chinese scientists and summarize the broader history of the field. We discuss the strategies that could be used in the future to optimize rice breeding further in the hope that China will continue to play a leading role in international rice breeding.

关键词： Chinese experience dwarf breeding hybrid rice breeding super rice breeding

Unified Classification and Rejection:A One-versus-all Framework

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Machine Intelligence Research 2024年第5期21卷 870-887页

作者： Zhen cheng Xu-Yao Zhang cheng-Lin Liu State Key Laboratory of Multimodal Artificial Intelligence Systems Institute of AutomationChinese Academy of SciencesBeijing100190China School of Artificial Intelligence University of Chinese Academy of SciencesBeijing100049China

Classifying patterns of known classes and rejecting ambiguous and novel(also called as out-of-distribution(OOD))inputs are involved in open world pattern *** neural network models usually excel in closed-set classification while perform poorly in rejecting OOD *** tackle this problem,numerous methods have been designed to perform open set recognition(OSR)or OOD rejection/detection *** methods mostly take post-training score transformation or hybrid models to ensure low scores on OOD inputs while separating known *** this paper,we attempt to build a unified framework for building open set classifiers for both classification and OOD *** formulate the open set recognition of K-known-class as a(K+1)-class classification problem with model trained on known-class samples *** decomposing the K-class problem into K one-versus-all(OVA)binary classification tasks and binding some parameters,we show that combining the scores of OVA classifiers can give(K+1)-class posterior probabilities,which enables classification and OOD rejection in a unified *** maintain the closed-set classification accuracy of the OVA trained classifier,we propose a hybrid training strategy combining OVA loss and multi-class cross-entropy *** implement the OVA framework and hybrid training strategy on the recently proposed convolutional prototype network and prototype classifier on vision transformer(ViT)*** on popular OSR and OOD detection datasets demonstrate that the proposed framework,using a single multi-class classifier,yields competitive performance in closed-set classification,OOD detection,and misclassification *** code is available at https://***/zhen-cheng121/CPN_OVA_unified.

关键词： Open set recognition out-of-distribution detection misclassification detection convolutional prototype network oneversus-all Dempster-Shafer theory of evidence

Effect of Al_(2)O_(3)/SiO_(2) mass ratio and CaO content on viscosity and structure of slag for pyrometallurgical processing of spent automotive catalysts

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Journal of Iron and Steel Research International 2024年第3期31卷 608-621页

作者： Zhe Wang Qi-long Wei cheng-bin Shi Zhan-cheng Guo State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

The effect of Al_(2)O_(3)/SiO_(2) mass ratio and CaO content on the viscosity and structure of the CaO-Al_(2)O_(3)-SiO_(2)-6MgO-1.5ZrO_(2)-1.5CeO_(2) slag was *** results show that with the increase in Al_(2)O_(3)/SiO_(2) mass ratio,the viscous flow units within the slag gradually change from Si-O-Si to Al-O-Al and ***,the substitution of Al_(2)O_(3) for SiO_(2) leads to the transformation of Si-O bonds towards weaker Al-O bonds,which weaken the bond strength of the aluminosilicate networks,thus leading to a decrease in the viscosity of *** increase in CaO content effectively promotes the depolymerization of the aluminosilicate networks,resulting in a significant decrease in the viscosity of the *** slag with Al_(2)O_(3)/SiO_(2) of 0.7-1.5 and CaO of 30 wt.%shows promise as the reference slag system for the Fe-collection smelting of spent automotive catalysts due to its good comprehensive performance.

关键词： Aluminosilicate slag Al_(2)O_(3)/SiO_(2)mass ratio CaO content Viscosity Slag structure