检索结果-南通市图书馆

Quantum Size Effects on Two Electrons and Two Holes in Double-Layer Quantum Dots

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2002年第7期38卷 99-102页

作者： XIE wen-fang ZHU wu Department of Physics Guangzhou University Guangzhou 510405 China Department of Physics Guangzhou University Guangzhou 510405 China

We propose a procedure to solve exactly the Schrodinger equation for a system of two electrons and two holes in a double-layer quantum dot by using the method of few-body physics. The features of the low-lying spectra have been deduced based on symmetry. The binding energies of the ground state are obtained as a function of the electron-to-hole mass ratio σ for a few values of the quantum dot size.

关键词： two-electron and two-hole system, quantum dot, method of few-body physics

Monte Carlo Simulation-Based Robust Workflow Scheduling for Spot Instances in Cloud Environments

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Tsinghua Science and Technology 2024年第1期29卷 112-126页

作者： Quanwang wu Jianzhao fang Jie Zeng Junhao wen Fengji Luo College of Computer Science Chongqing UniversityChongqing 400044China National Experimental Teaching Demonstration Center Chongqing UniversityChongqing 400044China College of Big Data and Software Engineering Chongqing UniversityChongqing 400044China School of Civil Engineering The University of SydneySydney 2006Australia

When deploying workflows in cloud environments,the use of Spot Instances(SIs)is intriguing as they are much cheaper than on-demand ***,Sls are volatile and may be revoked at any time,which results in a more challenging scheduling problem involving execution interruption and hence hinders the successful handling of conventional cloud workflow scheduling *** some scheduling methods for Sls have been proposed,most of them are no more applicable to the latest Sls,as they have evolved by eliminating bidding and simplifying the pricing *** study focuses on how to minimize the execution cost with a deadline constraint when deploying a workflow on volatile Sls in cloud *** on Monte Carlo simulation and list scheduling,a stochastic scheduling method called MCLS is devised to optimize a utility function introduced for this *** the Monte Carlo simulation framework,MCLS employs sampled task execution time to build solutions via deadline distribution and list scheduling,and then returns the most robust solution from all the candidates with a specific evaluation mechanism and selection *** results show that the performance of MCLS is more competitive comparedwithtraditionalalgorithms.

关键词： constrained optimization Monte Carlo simulation robustness Spot Instances(Sls) workflow scheduling

Evolution Toward the Observational Features of a Stripped Envelope TypeⅡb Supernova in a Binary System

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2022年第5期22卷 146-157页

作者： Gang Long Han-Feng Song Rui-Yu Zhang Ying Qin Liu-Yan Zhao Shi-Tao Qi fang-wen wu College of Physics Guizhou UniversityGuiyang 550025China College of Physics Henan Normal UniversityXinxiang 453007China Department of Physics Anhui Normal UniversityWuhu 241000China

TypeⅡb supernovae(SNeⅡb)that have a thin layer of hydrogen left in their outer envelope have been believed to belong to core collapse *** transfer via Roche lobe overflow can significantly change the nucleosynthesis and surface chemical elements of the progenitors of SNeⅡ*** aim to explore what conditions a close binary can meet with the observational features of SNeⅡ*** find that an observed low mass SNⅡb cannot be produced by a low mass isolated star with M<20,M_(⊙)due to the existence of a thick hydrogen envelope regardless of *** dominate as progenitors in the mass interval(i.e.,M<20 M_(⊙))considered in this *** 16 M_(⊙),primary with a 14 M_(⊙) companion in a binary system with~10 days

关键词： (stars:)binaries(including multiple) close-stars evolution-stars rotation-stars abundances

Evaluation of the binding affinity and antioxidant activity of phlorizin to pepsin and trypsin

在线全文

学校读者我要写书评

暂无评论

Food Science and Human Wellness 2024年第1期13卷 392-400页

作者： Jing Zhang Lan Tang Xia Hu Zhen Zeng wen wu fang Geng Hui Li Di wu Meat Processing Key Laboratory of Sichuan Province School of Food and Biological EngineeringChengdu UniversityChengdu 610106China School of Chemical Engineering Sichuan UniversityChengdu 610065China

Phlorizin(PHL)is a natural compound with strong antioxidant properties mainly found in *** this paper,the interaction mechanism of PHL with pepsin and trypsin was comparatively evaluated by computer simulation,fluorescence spectra,circular dichroism(CD),and Fourier transform infrared(FT-IR)spectra at a molecular *** spectra showed that PHL quenches the pepsin/trypsin by static *** parameters indicated that PHL binds to pepsin mainly through hydrogen bonds and van der Waals forces,and that of trypsin was electrostatic *** ground state complexes PHL and protease have a moderate affinity of 105 L/mol PHL binds more strongly to trypsin than to *** and FT-IR spectra results showed that pepsin/trypsin decreased theβ-sheet content and slightly changed its secondary structure upon *** experimental results are mutually verified with the predicted computer-aid simulation *** PHL and trypsin binding,the antioxidant capacity of PHL was ***,the antioxidant capacity of PHL was decreased after binding to *** work elucidates the binding of PHL binding mechanisms to pepsin/trypsin and provides useful information for the digestion of PHL to improve the application of PHL in food processing.

关键词： Interaction Phlorizin Pepsin Trypsin Antioxidation

Advance in reversible Zn anodes promoted by 2D materials

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2024年第4期43卷 1350-1369页

作者： Shu-Yuan Lei Jin-Xiu Feng Yu-Chao Chen Dong Zheng wen-Xian Liu wen-Hui Shi fang-fang wu Xie-Hong Cao School of Materials Science and Engineering Zhejiang University of TechnologyHangzhou310014China Center for Membrane Separation and Water Science and Technology College of Chemical EngineeringZhejiang University of TechnologyHangzhou310014China

With the growing energy demand associated with high safety and low-cost requirement,aqueous zinc-ion batteries(AZIBs)have been considered as one of the most promising next-generation ***,some key issues,such as uncontrollable dendrites growth,severe corrosion,hydrogen evolution and side reactions of Zn anodes during charge/discharge process,have hindered its pragmatic ***-dimensional(2D)materials hold advantages of unique physical and chemical properties,large surface areas and abundant active sites,which have been successfully used to overcome the above shortcomings of Zn anodes in recent *** this review,the issues and challenges of Zn anodes are ***,the state-of-the-art progress on Zn anodes modification based on 2D materials such as graphene,2D metal carbides and nitrides(MXenes),2D metal-organic frameworks(MOFs),2D covalent organic frameworks(COFs),2D transition metal compounds and other 2D materials is discussed in ***,the perspectives of employing 2D materials in highly reversible Zn anodes are summarized and discussed.

关键词： 2D materials Aqueous zinc-ion battery Zn anodes Dendrites growth

Nonlinear metamaterial enabled aeroelastic vibration reduction of a supersonic cantilever wing plate

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(English Edition) 2024年第10期45卷 1749-1772页

作者： Peng SHENG Xin fang Dianlong YU Jihong wen Laboratory of Science and Technology on Integrated Logistics Support College of Intelligence Science and TechnologyNational University of Defense TechnologyChangsha 410073China

The violent vibration of supersonic wings threatens aircraft *** paper proposes the strongly nonlinear acoustic metamaterial(NAM)method to mitigate aeroelastic vibration in supersonic wing *** employ the cantilever plate to simulate the practical behavior of a *** aeroelastic vibration model of the NAM cantilever plate is established based on the mode superposition method and a modified third-order piston *** aerodynamic properties are systematically studied using both the timedomain integration and frequency-domain harmonic balance *** presenting the flutter and post-flutter behaviors of the NAM wing,we emphasize more on the preflutter broadband vibration that is prevalent in *** results show that the NAM method can reduce the low-frequency and broadband pre-flutter steady vibration by 50%-90%,while the post-flutter vibration is reduced by over 95%,and the critical flutter velocity is also slightly *** clarified,the significant reduction arises from the bandgap,chaotic band,and nonlinear resonances of the NAM *** reduction effect is robust across a broad range of parameters,with optimal performance achieved with only 10%attached *** work offers a novel approach for reducing aeroelastic vibration in aircraft,and it expands the study of nonlinear acoustic/elastic metamaterials.

关键词： nonlinear acoustic metamaterial(NAM) hypersonic aeroelastic vibration vibration reduction fluid-structure interaction

Design and Implementation of Nonlinear Precoding for MIMO-SDMA Toward 6G Wireless

在线全文

学校读者我要写书评

暂无评论

China Communications 2024年第1期21卷 69-87页

作者： Chaowu wu Yue Xiao Shu fang Gang wu National Key Laboratory of Wireless Communications University of Electronic Science and Technology of ChinaChengdu 611731China

In this paper,we present a novel and robust nonlinear precoding(NLP)design and detection structure specifically tailored for multiple-input multipleoutput space division multiple access(MIMO-SDMA)systems toward 6G *** approach aims to effectively mitigate the impact of imperfect channel estimation by leveraging the channel fluctuation mean square error(MSE)for reconstructing a highly accurate precoding matrix at the ***,we introduce a simplified receiver structure that eliminates the need for equalization,resulting in reduced interference and notable enhancements in overall system *** conduct both computer simulations and experimental tests to validate the efficacy of our proposed *** results reveals that the proposed NLP scheme offers significant performance improvements,making it particularly well-suited for the forthcoming 6G wireless.

关键词： MIMO-SDMA nonlinear precoding Tomlinson-Harashima precoding(THP) vector perturbation(VP)

Comparing short-term outcomes of robot-assisted and conventional laparoscopic total mesorectal excision surgery for rectal cancer in elderly patients

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastrointestinal Surgery 2024年第5期16卷 1271-1279页

作者： Hao Yang Gang Yang wen-Ya wu fang Wang Xue-Quan Yao Xiao-Yu wu The Affiliated Hospital of Nanjing University of Chinese Medicine Nanjing University of Chinese MedicineNanjing 210029Jiangsu ProvinceChina Department of Surgical Oncology The Affiliated Hospital of Nanjing University of Chinese MedicineNanjing 210029Jiangsu ProvinceChina

BACKGROUND Da Vinci Robotics-assisted total mesorectal excision(TME)surgery for rectal cancer is becoming more widely *** is no strong evidence that roboticassisted surgery and laparoscopic surgery have similar outcomes in elderly patients with TME for rectal *** To determine the improved oncological outcomes and short-term efficacy of robot-assisted surgery in elderly patients undergoing TME *** A retrospective study of the clinical pathology and follow-up of elderly patients who underwent TME surgery at the Department of Gastrointestinal Oncology at the Affiliated Hospital of Nanjing University of Chinese Medicine was conducted from March 2020 through September *** patients were divided into a robotassisted group(the R-TME group)and a laparoscopic group(the L-TME group),and the short-term efficacy of the two groups was *** There were 45 elderly patients(≥60 years)in the R-TME group and 50 elderly patients(≥60 years)in the L-TME *** were no differences in demographics,conversion rates,or postoperative complication *** L-TME group had a longer surgical time than the R-TME group[145(125,187.5)vs 180(148.75,206.25)min,P=0.005),and the first postoperative meal time in the L-TME group was longer than that in the R-TME(4 vs 3 d,P=0.048).Among the sex and body mass index(BMI)subgroups,the R-TME group had better out-comes than did the L-TME group in terms of operation time(P=0.042)and intraoperative assessment of bleeding(P=0.042).In the high BMI group,catheter removal occurred earlier in the R-TME group than in the L-TME group(3 vs 4 d,P=0.001),and autonomous voiding function was *** The curative effect and short-term efficacy of robot-assisted TME surgery for elderly patients with rectal cancer are similar to those of laparoscopic TME surgery;however,robotic-assisted surgery has better short-term outcomes for individuals with risk factors such as obesity and pelvic *** the learning

关键词： Robotic surgery Laparoscopy Rectal cancer Total mesorectal excision Elderly

Dexmedetomidine ameliorates diabetic intestinal injury by promoting the polarization of M2 macrophages through the MMP23B pathway

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Diabetes 2024年第9期15卷 1962-1978页

作者： Man Lu Xiao-wen Guo fang-fang Zhang Dan-Hong wu Di Xie Feng-Qin Luo Department of Anesthesiology The First Affiliated Hospital of Zhejiang Chinese Medical University(Zhejiang Provincial Hospital of Traditional Chinese Medicine)Hangzhou 310006Zhejiang ProvinceChina Department of Emergency Xinhua Hospital Affiliated to Shanghai Jiao Tong University School of MedicineShanghai 200092China

BACKGROUND Diabetes is often associated with gastrointestinal dysfunctions,which can lead to ***(DEX)is a commonly used sedative in perioperative diabetic patients and may affect gastrointestinal *** To investigate whether sedative doses of DEX alleviate diabetes-caused intestinal *** Sedation/anesthesia scores and vital signs of streptozotocin(STZ)-induced diabetic mice under DEX sedation were *** mice were divided into saline and DEX *** injecting sedatives intraperitoneally,tight junctions(TJs)and apoptotic levels were evaluated 24 hours later to assess the intestinal barrier *** role of DEX was validated using Villin-MMP23B flox/flox mice with intestinal epithelial *** vitro,high glucose and hyperosmolarity were used to culture Caco-2 monolayer cells with STZ *** techniques were used to monitor the barrier and mitochondrial *** MMP23B protein levels in the intestinal tissue of STZ-induced diabetic mice were significantly higher than those in the intestinal tissue of control mice,with the DEX group displaying decreased MMP23B ***-mediated TJ disruption,increased intestinal mucosal permeability,and systemic inflammation in wild-type mice might be reversed by *** Caco-2 cells,MMP23B was associated with increased reactive oxygen species accumulation,mitochondrial membrane potential depolarization,and TJ *** DEX reduces MMP23B,which may potentially contribute to STZ-induced intestinal barrier dysfunction,affecting TJ modification through mitochondrial dysfunction.

关键词： Diabetes Dexmedetomidine Intestinal barrier Piezo1 Tight junctions