检索结果-南通市图书馆

Biomineralization and mineralization using microfluidics:A comparison study

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Rock Mechanics and Geotechnical Engineering 2024年第2期16卷 661-669页

作者： Yang Xiao Xiang He Guoliang Ma Chang Zhao jian chu Hanlong Liu Key Laboratory of New Technology for Construction of Cities in Mountain Area Chongqing UniversityChongqing400045China State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing UniversityChongqing400045China School of Civil Engineering Chongqing UniversityChongqing400045China School of Civil and Environmental Engineering Nanyang Technological UniversitySingapore

Biomineralization through microbial process has attracted great attention in the field of geotechnical engineering due to its ability to bind granular materials,clog pores,and seal fractures.Although minerals formed by biomineralization are generally the same as that by mineralization,their mechanical behaviors show a significant discrepancy.This study aims to figure out the differences between biomineralization and mineralization processes by visualizing and tracking the formation of minerals using microfluidics.Both biomineralization and mineralization processes occurred in the Y-shaped sandcontaining microchip that mimics the underground sand layers.Images from different areas in the reaction microchannel of microchips were captured to directly compare the distribution of minerals.Crystal size and numbers from different reaction times were measured to quantify the differences between biomineralization and mineralization processes in terms of crystal kinetics.Results showed that the crystals were precipitated in a faster and more uncontrollable manner in the mineralization process than that in the biomineralization process,given that those two processes presented similar precipitation stages.In addition,a more heterogeneous distribution of crystals was observed during the biomineralization process.The precipitation behaviors were further explained by the classical nucleation crystal growth theory.The present microfluidic tests could advance the understanding of biomineralization and provide new insight into the optimization of biocementation technology.

关键词： Microbially induced carbonate precipitation (MICP) Biocementation Crystal Calcium carbonate Nucleation

Effect of Ti contents on interfacial bonding, mechanical and thermal properties of Mo-Cu composites

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Tungsten 2024年第3期6卷 549-554页

作者： jian-Ru chu Xiao-Song jiang Tian-Yan Liu Key Laboratory of Advanced Technologies of Materials Ministry of Education School of Materials Science and Engineering Southwest Jiaotong University Reactor Engineering Research Sub-Institute Nuclear Power Institute of China

Mo-Cu composites are widely used in electronic packaging, vacuum technology, microwave devices and other fields due to their excellent properties, such as excellent electrical and thermal conductivity, low adjustable ...

关键词：

A novel model for assessing the degree of intelligent manufacturing readiness in the process industry: process-industry intelligent manufacturing readiness index (PIMRI)

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Information Technology & Electronic Engineering 2023年第3期24卷 417-432页

作者： Lujun ZHAO Jiaming SHAO Yuqi QI jian chu Yiping FENG State Key Laboratory of Industrial Control Technology College of Control Science and EngineeringZhejiang UniversityHangzhou 310027China Zhejiang SUPCON Technology Co. Ltd.Hangzhou 310053China State Key Laboratory of Clean Energy Utilization Zhejiang UniversityHangzhou 310027China

Recently,the implementation of Industry 4.0 has become a new tendency,and it brings both opportunities and challenges to worldwide manufacturing companies.Thus,many manufacturing companies are attempting to find advanced technologies to launch intelligent manufacturing transformation.In this study,we propose a new model to measure the intelligent manufacturing readiness for the process industry,which aims to guide companies in recognizing their current stage and short slabs when carrying out intelligent manufacturing transformation.Although some models have already been reported to measure Industry 4.0 readiness and maturity,there are no models that are aimed at the process industry.This newly proposed model has six levels to describe different development stages for intelligent manufacturing.In addition,the model consists of four races,nine species,and 25 domains that are relevant to the essential businesses of companies’daily operation and capability requirements of intelligent manufacturing.Furthermore,these 25 domains are divided into 249 characteristic items to evaluate the manufacturing readiness in detail.A questionnaire is also designed based on the proposed model to help process-industry companies easily carry out self-diagnosis.Using the new method,a case including 196 real-world process-industry companies is evaluated to introduce the method of how to use the proposed model.Overall,the proposed model provides a new way to assess the degree of intelligent manufacturing readiness for process-industry companies.

关键词： Process industry Industry 4.0 Readiness model Intelligent manufacturing Readiness index

“Zero ischemia”laparoscopic partial nephrectomy by high-power GreenLight laser enucleation for renal carcinoma:A single-center experience

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2022年第17期10卷 5646-5654页

作者： Xiang-Min Zhang Ji-Dong Xu jian-Min Lv Xiu-Wu Pan jian-Wei Cao jian chu Xin-Gang Cui Department of Urology Xinhua HospitalShanghai Jiaotong UniversitySchool of MedicineShanghai 200092China Department of Urology Shanghai Baoshan Luodian HospitalShanghai 201908China Department of Urology Gongli Hospital of The Second Military Medical UniversityShanghai 200135China Department of Urology Shanghai The Seventh People's HospitalShanghai 200137China

BACKGROUND Laparoscopic partial nephrectomy has been widely used in renal cell carcinoma treatment.The efficacy of GreenLight laser on Laparoscopic partial nephrectomy is still unknown.AIM To present the first series of laparoscopic partial nephrectomy(LPN)by GreenLight laser enucleation without renal artery clamping.Due to the excellent coagulation and hemostatic properties of the laser,laser-assisted LPN(LLPN)makes it possible to perform a“zero ischemia”resection.METHODS Fifteen patients with T1a exogenous renal tumors who received high-power GreenLight laser non-ischemic LPN in our hospital were retrospectively analyzed.All clinical information,surgical and post-operative data,complications,pathological and functional outcomes were analyzed.RESULTS Surgery was successfully completed in all patients,and no open or radical nephrectomy was performed.The renal artery was not clamped,leading to no ischemic time.No blood transfusions were required,the average hemoglobin level ranged from 96.0 to 132.0 g/L and no postoperative complications occurred.The mean operation time was 104.3±8.2 min.The postoperative removal of negative pressure drainage time ranged from 5.0 to 7.0 d,and the mean postoperative hospital stay was 6.5±0.7 d.No serious complications occurred.Postoperative pathological results showed clear cell carcinoma in 12 patients,papillary renal cell carcinoma in 2 patients,and hamartoma in 1 patient.The mean creatinine level was 75.0±0.8μmol/L(range 61.0-90.4μmol/L)at 1 mo after surgery,and there were no statistically significant differences compared with pre-operation(P>0.05).The glomerular filtration rate ranged from 45.1 to 60.8 mL/min,with an average of 54.0±5.0 mL/min,and these levels were not significantly different from those before surgery(P>0.05).CONCLUSION GreenLight laser has extraordinary cutting and sealing advantages when used for small renal tumors(exogenous tumors of stage T1a)during LPN.However,use of this technique can lead to the generation of excessive smoke.

关键词： GreenLight laser Zero ischemia Partial nephrectomy Laparoscopy Renal tumor

总会计师交流任职能够改善国有企业会计信息质量吗

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

会计研究 2024年第1期 21-34页

作者：褚剑南京大学商学院 210093

如何通过有效的国资监管制度完善国有企业治理、维护国有资产安全是重要的理论和现实问题,本文以中央企业总会计师交流任职为切入点尝试回答这一问题。研究发现,总会计师交流任职能够提高国有企业的会计信息质量。机制检验发现,总会计... 详细信息

如何通过有效的国资监管制度完善国有企业治理、维护国有资产安全是重要的理论和现实问题,本文以中央企业总会计师交流任职为切入点尝试回答这一问题。研究发现,总会计师交流任职能够提高国有企业的会计信息质量。机制检验发现,总会计师任期越长、中央企业开展董事会试点以及受到审计监督后,上述结果减弱。进一步地,区分交流任职的来源特征后发现,上述结果只体现在总会计师交流自非同行业企业、非同城市企业以及伴随着晋升的情况下。经济后果检验发现,总会计师交流任职通过提高会计信息质量缓解了国有企业的过度投资和超额在职消费问题。综上表明,总会计师交流任职能够增强其履职的独立性,进而加强国有企业财务管理和监督,改善国有企业治理,防止国有资产流失。本文的研究结论对于当前深化国企改革背景下加强国有资产监督、维护国有资产安全具有重要启示。

关键词：总会计师交流任职独立性国有企业财务管理和监督

A two-dimensional MoS_(2) array based on artificial neural network learning for high-quality imaging

在线全文

学校读者我要写书评

暂无评论

Nano Research 2023年第7期16卷 10139-10147页

作者： Long Chen Siyuan Chen Jinchao Wu Luhua Chen Shuai Yang jian chu Chengming jiang Sheng Bi Jinhui Song School of Mechanical Engineering Dalian University of TechnologyDalian 116024China School of Computer Science Southwest Petroleum UniversityChengdu 610500China

As the basis of machine vision,the biomimetic image sensing devices are the eyes of artificial intelligence.In recent years,with the development of two-dimensional(2D)materials,many new optoelectronic devices are developed for their outstanding performance.However,there are still little sensing arrays based on 2D materials with high imaging quality,due to the poor uniformity of pixels caused by material defects and fabrication technique.Here,we propose a 2D MoS_(2)sensing array based on artificial neural network(ANN)learning.By equipping the MoS_(2)sensing array with a“brain”(ANN),the imaging quality can be effectively improved.In the test,the relative standard deviation(RSD)between pixels decreased from about 34.3%to 6.2%and 5.49%after adjustment by the back propagation(BP)and Elman neural networks,respectively.The peak signal to noise ratio(PSNR)and structural similarity(SSIM)of the image are improved by about 2.5 times,which realizes the re-recognition of the distorted image.This provides a feasible approach for the application of 2D sensing array by integrating ANN to achieve high quality imaging.

关键词： two-dimensional MoS_(2) sensing array artificial neural network individual difference imaging quality

Recent development in biogeotechnology and its engineering applications

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Structural and Civil Engineering 2021年第5期15卷 1073-1096页

作者： Hanjiang LAI Shifan WU Mingjuan CUI jian chu Zijin School of Geology and Mining Fuzhou UniversityFuzhou 350108China School of Civil and Environmental Engineering Nanyang Technological UniversitySingapore 639798Singapore College of Civil Engineering Fuzhou UniversityFuzhou 350108China

Microbial geotechnology or biogeotechnology is a new branch of geotechnical engineering.It involves the use of microbiology for traditional geotechnical applications.Many new innovative soil improvement methods have been developed in recent years based on this approach.A proper understanding of the various approaches and the performances of different methods can help researchers and engineers to develop the most appropriate geotechnical solutions.At present,most of the methods can be categorized into three major types,biocementation,bioclogging,and biogas desaturation.Similarities and differences of different approaches and their potential applications are reviewed.Factors affecting the different processes are also discussed.Examples of up-scaled model tests and pilot trials are presented to show the emerging applications.The challenges and problems of biogeotechnology are also discussed.

关键词： biogeotechnology biocementation bioclogging biogas strength enhancement liquefaction mitigation seepage control

Reliable H-infinity filtering for linear systems with sensor saturation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

控制理论与应用（英文版） 2013年第1期11卷 80-85页

作者： Ting SHI Hongye SU jian chu Institute of Automation Hangzhou Dianzi University State Key Laboratory of Industrial Control Technology Institute of Cyber-Systems and Control Zhejiang University (Yuquan Campus)

In this paper, a new reliable H-infinity filter design problem is proposed for a class of continuous-time sys- tems with sensor saturation and failures. Attention is focused on the analysis and synthesis problems of a full order reliable H-infinity filter such that the filtering error dynamics is asymptotically stable with a guaranteed disturbance rejection atten- uation level -y. It is shown that the filtering error dynamics obtained from the original system plus the filter can be modeled by a linear system with sector bounded nonlinearity. The design conditions are given in terms of solutions to a set of linear matrix inequalities （LMIs）. These conditions are then considered in a convex optimization problem with LMIs constraints in order to design an optimal reliable H-infinity filter. A numerical example is given to illustrate the effectiveness of the proposed results.

关键词： H-infinity filtering Reliable filtering Sensor saturation Sensor failures Linear matrix inequality

Improving the real-time performance of Ethernet for plant automation(EPA) based industrial networks

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science C(Computers and Electronics) 2013年第6期14卷 433-448页

作者： Li LU Dong-qin FENG jian chu Institute of Cyber-Systems and Control Zhejiang University State Key Laboratory of Industrial Control Technology Zhejiang University

Real-time Ethernet(RTE) control systems with critical real-time requirements are called fast real-time(FRT) systems.To improve the real-time performance of Ethernet for plant automation(EPA),we propose an EPA-FRT scheme.The minimum macrocycle of EPA networks is reduced by redefining the EPA network frame format,and the synchronization process is modified to acquire higher accuracy.A multi-segmented topology with a scheduling scheme is introduced to increase effective bandwidth utilization and reduce protocol overheads,and thus to shorten the communication cycle significantly.Performance analysis and practical tests on a prototype system show the effectiveness of the proposed scheme,which achieves the best performance at small periodic payload in large scale systems.

关键词： Ethernet for plant automation(EPA) Fast real-time(FRT) system Real-time Ethernet(RTE) Scheduling scheme