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Hierarchical hollow microspheres assembled from carbon nanosheets integrated with molybdenum carbide nanoparticles for boosting microwave absorption properties

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Nano Research 2025年第1期18卷 10-20页

作者： Zongsheng Chen Yahui Wang Yi Liu Zhigang Li Xiangyin Lv Liping Liu Yajing chang Jiaming Shi xiao Zhang State Key Laboratory of Pulsed Power Laser Technology School of Electronic EngineeringNational University of Defense TechnologyHefei 230037China Anhui Provincial Laboratory of Advanced Laser Technology School of Electronic EngineeringNational University of Defense TechnologyHefei 230037China Centre for Environmental and Energy Nanomaterials Anhui Key Laboratory of Nanomaterials and NanotechnologyCAS Centre for Excellence in NanoscienceInstitute of Solid State PhysicsHefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China

Hierarchical hollow structure has demonstrated potential for enhancing electromagnetic(EM)attenuation and improving impedance matching,garnering significant attention for ***,we have successfully implemented compositional and structural engineering to fabricate hollow Mo2C/C microspheres with controllable composition by coupling interaction between dopamine hydrochloride and ammonium *** the synergistic effect of composition and hollow structure,the strongest reflection loss intensity and broadest effective absorption of the optimized sample reach-70.2 dB and 6.2 GHz,*** formation of hollow heterogeneous structures not only favors impedance matching feature,but also generates considerable contribution to EM attenuation ***,radar cross-section simulation data indicate that hollow Mo2C/C microspheres with compositional optimization and heterogeneous structures have broad prospects for practical applications.

关键词： electromagnetic absorption Mo2C/C microwave absorption hollow structure

基于肺部感染控制窗结合自主呼吸试验时机下行序贯机械通气治疗COPD急性加重期疗效及对肺功能、血气指标的影响研究

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罕少疾病杂志 2025年第1期32卷 68-70页

作者：姚园场胡长新肖文永城市人民医院重症医学科河南永城476600

目的探讨基于肺部感染控制窗(PIC-W)结合自主呼吸试验(SBT)时机下行序贯机械通气治疗慢性阻塞性肺病急性加重期(AECOPD)患者的临床研究,为临床应用提供指导。方法对笔者所在医院重症监护室(ICU)收治的86例行有创-无创序贯机械通气治疗... 详细信息

目的探讨基于肺部感染控制窗(PIC-W)结合自主呼吸试验(SBT)时机下行序贯机械通气治疗慢性阻塞性肺病急性加重期(AECOPD)患者的临床研究,为临床应用提供指导。方法对笔者所在医院重症监护室(ICU)收治的86例行有创-无创序贯机械通气治疗的COPD急性加重期患者进行回顾性分析,根据切换点的选择分为对照组43例,选择PIC确定有创-无创序贯机械通气治疗时机,实验组43例选择PIC-W+SBT确定有创-无创序贯机械通气治疗时机。比较两组治疗效果。结果两组患者治疗后FEV1、FVC值、PaCO_(2)、SaO_(2)显均高于治疗前,且实验组高于对照组(P<0.05);实验组治疗后PaO_(2)值、再次插管率、死亡率及并发症发生率均低于对照组(P<0.05);实验组机械通气总时间、ICU住院时间均短于对照组(P<0.05)。结论基于肺部感染控制窗结合自主呼吸试验时机下行序贯机械通气治疗慢性阻塞性肺病急性加重期患者耐受性好,降低再次插管率、病死率,且在改善肺功能、血气指标及降低并发症方面具有积极作用,可在临床上推广应用。

关键词：慢性阻塞性肺疾病肺部感染控制窗自主呼吸试验序贯机械通气

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The differential fault analysis on block cipher FeW

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Cybersecurity 2023年第2期6卷 62-74页

作者： Haiyan xiao Lifang Wang Jinyong chang School of Computer Science Northwestern Polytechnical UniversityXiAn 710055People's Republic of China Engineering University of PAP XiAn 710055People's Republic of China School of Information and Control Engineering XiAn University of Architecture and TechnologyXi'An 710055People's Republic of China State Key Laboratory of Information Security(SKLOIS) Institute of Information EngineeringChinese Academy of SciencesBeijing 100089People's Republic of China

Feather weight(FeW)cipher is a lightweight block cipher proposed by Kumar et *** 2019,which takes 64 bits plaintext as input and produces 64 bits *** Kumar et ***,FeW is a software oriented design with the aim of achieving high efficiency in software based *** seems that FeW is immune to many cryptographic attacks,like linear,impossible differential,differential and zero correlation ***,in recent work,Xie et *** the security of *** precisely,they proved that under the differential fault analysis(DFA)on the encryption states,an attacker can completely recover the master secret *** this paper,we revisit the block cipher FeW and consider the DFA on its key schedule algorithm,which is rather popular cryptanalysis for kinds of block *** particular,by respectively injected faults into the 30th and 29th round subkeys,one can recover about 55/80~69%bits of master *** the brute force searching remaining bits,one can obtain the full master secret *** simulations and experiment results show that our analysis is practical.

关键词： Differential fault analysis Block cipher FeW Side channel attack

A game theory based method for inter-plant heat integration considering cost allocation

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Chinese Journal of Chemical Engineering 2020年第6期28卷 1652-1660页

作者： Yufei Wang Zehuan Wan Chenglin chang xiao Feng State Key Laboratory of Heavy Oil Processing China University of PetroleumBeijing 102249China School of Chemical Engineering and Technology Xi'an Jiaotong UniversityXi'an 710049China

Inter-plant heat integration is an effective way for energy recovery in process industry. Although inter-plant heat integration can significantly reduce energy consumption, it is not widely applied in the multiple stakeholders’ situation due to profit or cost distribution problems. Therefore, this work considers both the technique aspects of heat integration and its business aspects between stakeholders simultaneously. The new proposed methodology consists of three steps. Firstly the optimal matching of heat integration between plants is obtained through mathematical programming. Then the cost distribution is decided through game theory. Finally the cost distribution obtained previous is corrected by an ideal expert model. A case study is used to illustrate the effectiveness of the method in the end of the work.

关键词： Heat Integration Inter-plant Game theory Cost distribution

Pyrolyzed bacterial cellulose/graphene oxide sandwich interlayer for lithium–sulfur batteries

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Rare Metals 2017年第5期36卷 418-424页

作者： Yu-Di Shen Zhi-chang xiao Li-xiao Miao De-Bin Kong xiao-Yu Zheng Yan-Hong chang Lin-Jie Zhi Chinese Academy of Sciences Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in NanoscienceNational Center for Nanoscience and Technology Beijing 100190China Department of Environmental Engineering University of Science and Technology of BeijingBeijing 100083China Beijing Key Laboratory of Resource-Oriented Treatment of Industrial Pollutants University of Science and Technology of BeijingBeijing 100083China Institute of Forensic Science Ministry of Public SecurityBeijing 100038China

Herein, a facile strategy for the synthesis of sandwich pyrolyzed bacterial cellulose（PBC）/graphene oxide（GO） composite was reported simply by utilizing the large-scale regenerated biomass bacterial cellulose as precursor. The unique and delicate structure where three-dimensional interconnected bacterial cellulose（BC） network embedded in two-dimensional GO skeleton could not only work as an effective barrier to retard polysulfide diffusion during the charge/discharge process to enhance the cyclic stability of the Li–S battery, but also offer a continuous electron transport pathway for the improved rate *** a result, by utilizing pure sulfur as cathodes, the Li–S batteries assembled with PBC/GO interlayer can still exhibit a capacity of nearly 600 mAh·g^-1 at 3C and only 0.055% capacity decay per cycle can be observed over 200 cycles. Additionally, the cost-efficient and environmentfriendly raw materials may enable the PBC/GO sandwich interlayer to be an advanced configuration for Li–S batteries.

关键词： Biomass materials Graphene oxide Separator Lithium–sulfur batteries

Mechanism for acetic acid-catalyzed ester aminolysis

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Chinese Chemical Letters 2018年第8期29卷 1233-1236页

作者： chang xiao Song-Lin Zhang Key Laboratory of Synthetic and Biological Colloids Ministry of Education School of Chemical and Material Engineering Jiangnan University

This paper reports a computational study elucidating reaction mechanism for amide bond formation from esters and amines catalyzed by acetic acid. Two optional mechanisms（namely, classic stepwise and concerted acyl substitution mechanisms） have been studied. Calculation results establish the reaction energy profiles of both mechanisms and locate all the intermediates and transition states in both catalytic cycles. Our results propose that the concerted acyl substitution mechanism may be more likely wherein the formation of CààN bond and the cleavage of CààO bond occur concurrently without the need of rehybridization of the carbonyl carbon. This is also consistent with the fact that no significant racemization/epimerization were observed in the amide products when asymmetric esters and/or amines were used as the reactants, because concerted acyl substitution mechanism precludes the intermediacy of tetrahedral adducts and the accompanying generation/elimination of new chiral *** discussion implies that the concerted acyl substitution mechanism may widely occur in related amidation reactions in the presence of different types of coupling reagents.

关键词： Amide bond formation Aminolysis Mechanism Ester Concerted acyl substitution Acid catalyzed amidation

On the Ricci Curvature of a Randers Metric of Isotropic S-curvature

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Acta Mathematica Sinica,English Series 2008年第6期24卷 911-916页

作者： xiao Huan MO chang Tao YU Key Laboratory of Pure and Applied Mathematics School of Mathematical Sciences Peking University Beijing 100871 P. R. China

We derive the integral inequality of a Randers metric with isotropic S-curvature in terms of its navigation representation. Using the obtained inequality we give some rigidity results under the condition of Ricci curvature. In particular, we show the following result： Assume that an n-dimensional compact Randers manifold （M, F） has constant S-curvature c. Then （M, F） must be Riemannian if its Ricci curvature satisfies that Ric 〈 -（n - 1）c^2.

关键词： Finsler manifold Randers metric Ricci curvature

“数字中国”背景下学前教育数字化资源建设现状与对策研究

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四川师范大学学报（自然科学版） 2025年第2期48卷 208-219页

作者：胡晓瞿畅杨欣雨四川师范大学巴蜀研究院四川成都610066 四川师范大学影视与传媒学院四川成都610066

中国学前教育数字化资源丰富,但是存在区域差异,国家和省级优质学前教育资源整合效率不能满足现有的数字化资源需求,学前教育数字化资源利用质量不高.调研现有学前数字化资源平台,对资源建设部门工作人员、幼儿园管理者和教师进行访谈,... 详细信息

中国学前教育数字化资源丰富,但是存在区域差异,国家和省级优质学前教育资源整合效率不能满足现有的数字化资源需求,学前教育数字化资源利用质量不高.调研现有学前数字化资源平台,对资源建设部门工作人员、幼儿园管理者和教师进行访谈,发现中国省级以上教育部门学前教育数字化共享资源严重匮乏,企业提供的学前数字化资源缺乏资源建设标准和监管机制,资源质量参差不齐.基于学前数字化资源建设不完善的情况,提出学前教育大数据资源检索、可视化和聚合策略模型,以及学前数字化资源评价策略,为学前教育数字化资源建设单位和幼儿园提供数字化资源建设参考.

关键词：学前教育数字化资源建设教师数字素养资源聚合

Combinatorial pooled sequencing： experiment design and decoding

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Frontiers of Electrical and Electronic Engineering in China 2016年第1期4卷 36-46页

作者： chang-chang Cao xiao Sun State Key Laboratory of Bioelectronics School of Biological Science and Medical Engineering Southeast University Nanjing210096 China

Owing to rapid advances in the next-generation sequencing technology, the cost of DNA sequencing has been reduced by over several orders of magnitude. However, genomic sequencing of individuals at the population scale is still restricted to a few model species due to the huge challenge of constructing libraries for thousands of samples. Meanwhile, pooled sequencing provides a cost-effective alternative to sequencing individuals separately, which could vastly reduce the time and cost for DNA library preparation. Technological improvements, together with the broad range of biological research questions that require large sample sizes, mean that pooled sequencing will continue to complement the sequencing of individual genomes and become increasingly important in the foreseeable future. However, simply mixing samples together for sequencing makes it impossible to identify reads that belongs to each sample. Barcoding technology could help to solve this problem, nonetheless, currently, barcoding every sample is costly especially for large-scale samples. An alternative to barcoding is combinatorial pooled sequencing which employs pooling pattern rather than short DNA barcodes to encode each sample. In combinatorial pooled sequencing, samples are mixed into few pools according to a carefully designed pooling strategy which allows the sequencing data to be decoded to identify the reads that belongs to the sample that are unique or rare in the population. In this review, we mainly survey the experiment design and decoding procedure for the combinatorial pooled sequencing applied in rare variant and rare haplotype carriers screening, complex genome assembling and single individual haplotyping.

关键词： combinatorial pooled sequencing experiment design decoding