检索结果-南通市图书馆

High-efficiency crystalline white organic lightemitting diodes

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Light(Science & Applications) 2024年第4期13卷 747-759页

作者： Yijun liu feng Zhu Yue Wang Donghang Yan State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China. School of Applied Chemistry and Engineering University of Science and Technology of ChinaHefei 230026China. State Key Laboratory of Supramolecular Structure and Materials Jilin UniversityChangchun 130012China

Crystalline white organic light-emitting diodes(C-WOLEDs)are promising candidates for lighting and display *** is urgently necessary,however,to develop energy-saving and high-efficiency C-WOLEDs that have stable and powerful emission to meet commercial ***,we report a crystalline host matrix(CHM)with embedded nanoaggregates(NA)structure for developing high-performance C-WOLEDs by employing a thermally activated delayed fluorescence(TADF)material and orange phosphorescent dopants(Phos.-D).The CHM-TADFNA-D WOLED exhibit a remarkable EQE of 12.8%,which is the highest performance WOLEDs based on crystalline *** device has a quick formation of excitons and a well-designed energy transfer process,and possesses a fast ramping of luminance and current *** to recently reported high-performance WOLEDs based on amorphous material route,the C-WOLED achieves a low series-resistance Joule-heat loss ratio and an enhanced photon output,demonstrating its significant potential in developing the next-generation WOLEDs.

关键词： diodes dopant crystalline

Regulatory Mechanisms for Transcriptional Bursting Revealed by an Event-Based Model

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 2024年第3期2023卷 217-231页

作者： Renje Wu Bangyan Zhou Wei Wang feng liu National Laboratory of Solid State Microstructures Department of Physicsand Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093P.R.China Institute for Brain Sciences Nanjing UniversityNanjing 210093P.R.China.

Gene transcription often occurs in discrete bursts, and it can be difficult to deduce the underlying regulatory mechanisms for transcriptional bursting with limited experimental data. Here, we categorize numerous states of single eukaryotic genes and identify 6 essential transcriptional events, each comprising a series of state transitions;transcriptional bursting is characterized as a sequence of 4 events, capable of being organized in various configurations, in addition to the beginning and ending events. By associating transcriptional kinetics with mean durations and recurrence probabilities of the events, we unravel how transcriptional bursting is modulated by various regulators including transcription factors. Through analytical derivation and numerical simulation, this study reveals key state transitions contributing to transcriptional sensitivity and specificity, typical characteristics of burst profiles, global constraints on intrinsic transcriptional noise, major regulatory modes in individual genes and across the genome, and requirements for fast gene induction upon stimulation. It is illustrated how biochemical reactions on different time scales are modulated to separately shape the durations and ordering of the events. Our results suggest that transcriptional patterns are essentially controlled by a shared set of transcriptional events occurring under specific promoter architectures and regulatory modes, the number of which is actually limited.

关键词： kinetics essentially constraints

On the Probability of Generating a Primitive Matrix

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 Systems Science & Complexity 2024年第4期37卷 1755-1771页

作者： CHEN Jingwei feng Yong liu Yang WU Wenyuan Chongqing Key Laboratory of Automated Reasoning and Cognition Chongqing Institute of Green and Intelligent TechnologyChinese Academy of SciencesChongqing 400714China Chongqing College University of Chinese Academy of SciencesChongqing 400714China Key Laboratory of Advanced Manufacturing Technology of Ministry of Education Guizhou UniversityyGuiyang 550025China Information Science and Engineering Chongqing Jiaotong UniversityChongqing 400074China

Given a k×n integer primitive matrix A(i.e.,a matrix can be extended to an n×n unimodular matrix over the integers)with the maximal absolute value of entries‖A‖bounded by an integer λ from above,the authors study the probability that the m×n matrix extended from A by appending other m-k row vectors of dimension n with entries chosen randomly and independently from the uniform distribution over{0,1,…,λ-1}is still *** authors present a complete and rigorous proof of a lower bound on the probability,which is at least a constant for fixed m in the range[k+1,n-4].As an application,the authors prove that there exists a fast Las Vegas algorithm that completes a k×n primitive matrix A to an n×n unimodular matrix within expected O(n^(ω)log‖A‖)bit operations,where O is big-O but without log factors,ω is the exponent on the arithmetic operations of matrix multiplication.

关键词： Integer matrix matrix completion probabilistic algorithm unimodular matrix

刘凤斌对慢性萎缩性胃炎“炎-癌”转化的病机探索与辨治思路

在线全文

学校读者我要写书评

暂无评论

广州中医药大学学报 2024年第7期41卷 1880-1885页

作者：江晓涛李培武杨泽虹安金琪黄远程文艺刘凤斌(指导) 广州中医药大学第一临床医学院广东广州510006 广州中医药大学第一附属医院广东广州510405 广州中医药大学第一附属医院白云医院广东广州510470

慢性萎缩性胃炎(chronic atrophic gastritis,CAG)是临床上常见的难治性胃病,属于胃癌前病变。刘凤斌教授及其团队历经30余年的探索和实践,提出“脾虚为本,气血湿为标,瘀毒为变”是CAG“炎-癌”转化的病机演变特点。脾胃虚弱为CAG发病... 详细信息

慢性萎缩性胃炎(chronic atrophic gastritis,CAG)是临床上常见的难治性胃病,属于胃癌前病变。刘凤斌教授及其团队历经30余年的探索和实践,提出“脾虚为本,气血湿为标,瘀毒为变”是CAG“炎-癌”转化的病机演变特点。脾胃虚弱为CAG发病的始动因素,贯穿疾病始终;气滞、血瘀、湿阻为CAG“炎-癌”转化的触发和加重因素;瘀毒的形成是CAG进展和转变的关键。辨治应遵循“证镜结合,分期论治”的原则,辨病和辨证相结合,宏观和微观辨证相补充;健脾扶正需贯穿始终。CAG早期阶段(胃黏膜以轻中度萎缩伴或不伴轻度肠上皮化生),其病机以脾胃虚弱为本,伴有气滞、湿阻、血瘀病理因素,治疗以健脾清热、理气活血为基本治法;CAG晚期阶段(胃黏膜重度萎缩伴或不伴中重度肠上皮和/或轻中度上皮内瘤变),基本病机为脾胃虚弱、痰瘀互结、胃络瘀毒,治疗以扶正散结、通络解毒为基本治法,从而构筑中医药阻断胃“炎-癌”转化的整体防线。

关键词：慢性萎缩性胃炎 “炎-癌”转化中医病机脾胃虚弱气滞血瘀湿阻辨治思路刘凤斌

MRm-DLDet:a memory-resident malware detection framework based on memory forensics and deep neural network

在线全文

学校读者我要写书评

暂无评论

Cybersecurity 2024年第1期7卷 88-109页

作者： Jiaxi liu Yun feng Xinyu liu Jianjun Zhao Qixu liu Institute of Information Engineering Chinese Academy of SciencesBeijing 100085China School of Cyber Security University of Chinese Academy of SciencesBeijing 100049China

Cyber attackers have constantly updated their attack techniques to evade antivirus software detection in recent *** popular evasion method is to execute malicious code and perform malicious actions only in ***-cious programs that use this attack method are called memory-resident malware,with excellent evasion capability,and have posed huge threats to cyber *** static and dynamic methods are not effective in detect-ing memory-resident *** addition,existing memory forensics detection solutions perform unsatisfactorily in detection rate and depend on massive expert knowledge in memory *** paper proposes MRm-DLDet,a state-of-the-art memory-resident malware detection framework,to overcome these ***-DLDet first builds a virtual machine environment and captures memory dumps,then creatively processes the memory dumps into RGB images using a pre-processing technique that combines deduplication and ultra-high resolution image cropping,followed by our neural network MRmNet in MRm-DLDet to fully extract high-dimensional features from memory dump files and detect *** receives the labeled sub-images of the cropped high-resolution RGB images as input of ResNet-18,which extracts the features of the *** trains a network of gated recurrent units with an attention ***,it determines whether a program is memory-resident malware based on the detection results of each sub-image through a specially designed voting *** created a high-quality dataset consisting of 2,060 benign and memory-resident *** other words,the dataset contains 1,287,500 labeled sub-images cut from the MRm-DLDet transformed ultra-high resolution RGB *** implement MRm-DLDet for Windows 10,and it performs better than the latest methods,with a detection accuracy of up to 98.34%.Moreover,we measured the effects of mimicry and adversarial attacks on MRm-DLDet,and the experimental results demonstrated the robustness

关键词： Memory-resident malware Memory forensics Malware detection Deep learning Ultra-high resolution image

A widely used nonionic surfactant with desired functional groups as aqueous electrolyte additives for stabilizing Zn anode

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Rare Metals 2024年第8期43卷 3692-3701页

作者： Yue-Xian Song Xiao-feng Wang Cai-bin liu Kai-Xuan Guo Xu-Huan Guo Xiao-bin Zhong Yao-Hui Zhang Kai Wang Hui-Juan Guo Li-Xin Zhang Jun-Fei Liang School of Energy and Power Engineering North University of ChinaTaiyuan 030051China Key Laboratory of Green Chemical Process of Ministry of Education Hubei Key Laboratory of Novel Chemical Reactor and Green Chemical TechnologySchool of Chemical Engineering and PharmacyWuhan Institute of TechnologyWuhan 430073China Shanxi Provincial Key Laboratory for High Performance Battery Materials and Devices Taiyuan 030051China

Aqueous Zn-ion batteries(AZIBs) have emerged as potential candidates for Li-ion batteries due to their intrinsic safety and high ***,metallic Zn anodes encounter dendrite growth and water-induced corrosion,rendering poor stability and severe irreversibility at the electrode/electrolyte interface during *** stabilize the Zn anode,we report a low-cost and effective nonionic surfactant,Tween-20 polymer,as an electrolyte additive for *** Tween-20,sequential oxyethylene groups tended to be preferentially adsorbed on the Zn electrode to form a shielding layer for regulating uniform Zn ***,the hydrophobic hendecyl chains prevented H_(2)O-induced corrosion on the Zn anode *** from the desired functional groups,when only trace amounts of Tween-20(0.050 g·L^(-1)) were used,the Zn anode displayed good cycling stability over 2170 h at10 mA·cm^(-2) and a high average Coulombic efficiency of98.94% over 1000 *** Tween-20 polymer can also be effectively employed in MnO_(2)/Zn full *** their toxicity,price and amount of usage,these surfactant additives provide a promising strategy for realizing the stability and reversibility of high-performance Zn anodes.

关键词： Zn anode Dendrite growth Tween-20 polymer Surfactant additive Aqueous electrolyte

Interaction mechanism between BaZrO_(3)/Y_(2)O_(3) refractory and Ti_(2)Ni alloy melts

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2024年第6期31卷 1376-1388页

作者： Xiao Hou Guang-yao Chen Jian liu Ming-rui Lv Fei-hai Yu Qi-sheng feng Rong-bin Li Xiong-gang Lu Chong-he Li State Key Laboratory of Advanced Special Steel and Shanghai Key Laboratory of Advanced Ferromeallurgy and School of Materials Science and Engineering Shanghai UniversityShanghai 200072China Shanghai Special Casting Engineering Technology Research Center Shanghai 201605China Zhejiang Institute of Advanced Materials Shanghai UniversityJiashan 314100ZhejiangChina School of Materials Science and Engineering Shanghai DianJi UniversityShanghai 201306China

The titanium alloys with highly chemical activity require stable crucible refractories that can withstand the erosion of alloy *** phase composition and microstructure are crucial factors that affect the stability of the refractory *** effect of Y_(2)O_(3) on the composition and microstructure of BaZrO_(3) crucible was systematically investigated,and the improved mechanism of the stability of BaZrO_(3)/Y_(2)O_(3) crucible was clarified in comparison with the BaZrO_(3) *** results showed that the erosion layer thickness of the BaZrO_(3)/Y_(2)O_(3) crucible was only 63μm,which was far less than that in the BaZrO_(3) crucible(485μm),and the erosion layer in the BaZrO_(3)/Y_(2)O_(3) crucible also exhibited a higher density than that in the BaZrO_(3) *** the sintering,Y_(2)O_(3) could improve the densification of the BaZrO_(3) crucible due to the solid solution effect between Y_(2)O_(3) and ZrO_(2),which also caused the evaporation of BaO,resulting in the generation of a Y_(2)O_(3)(ZrO_(2))film on the surface of the ***,the Y_(2)O_(3)(ZrO_(2))had higher thermodynamic stability than Y_(2)O_(3),confirming that the BaZrO_(3)/Y_(2)O_(3) crucible with high density exhibited a superior erosion resistance to titanium *** dual-phase structure provides a strategy to design a long-life and stable refractory for melting titanium alloys.

关键词： Barium zirconate Yttrium oxide Dual-phase refractory Titanium alloy Interaction

SMSTracker:A Self-Calibration Multi-Head Self-Attention Transformer for Visual Object Tracking

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2024年第7期80卷 605-623页

作者： Zhongyang Wang Hu Zhu feng liu School of Communications and Information Engineering Nanjing University of Posts and TelecommunicationsNanjing210003China

Visual object tracking plays a crucial role in computer *** recent years,researchers have proposed various methods to achieve high-performance object *** these,methods based on Transformers have become a research hotspot due to their ability to globally model and contextualize ***,current Transformer-based object tracking methods still face challenges such as low tracking accuracy and the presence of redundant feature *** this paper,we introduce self-calibration multi-head self-attention Transformer(SMSTracker)as a solution to these *** employs a hybrid tensor decomposition self-organizing multihead self-attention transformermechanism,which not only compresses and accelerates Transformer operations but also significantly reduces redundant data,thereby enhancing the accuracy and efficiency of ***,we introduce a self-calibration attention fusion block to resolve common issues of attention ambiguities and inconsistencies found in traditional trackingmethods,ensuring the stability and reliability of tracking performance across various *** integrating a hybrid tensor decomposition approach with a self-organizingmulti-head self-attentive transformer mechanism,SMSTracker enhances the efficiency and accuracy of the tracking *** results show that SMSTracker achieves competitive performance in visual object tracking,promising more robust and efficient tracking systems,demonstrating its potential to providemore robust and efficient tracking solutions in real-world applications.

关键词： Visual object tracking tensor decomposition transformer self-attention

Spinal surgeons＇ learning curve for lumbar microendoscopic discectomy： a prospective study of our first 50 and latest 10 cases

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Medical Journal 2008年第21期121卷 2148-2151页

作者： RONG Li-min XIE Pei-gen SHI De-hai DONG Jian-wen liu bin feng feng CAI Dao-zhang Department of Orthopaedics Third Affiliated Hospital of Sun Yat-sen University Guangzhou Guangdong 510630 China

Background Microendoscopic discectomy （MED） is a minimally invasive operation that allows rapid recovery from surgery for lumbar disc herniation, but has replaced traditional open surgery in few hospitals because most surgeons avoid its long learning curve. We evaluated the effectiveness and safety of lumbar MED at stages of spinal surgeons＇ learning curve. Methods Fifty patients receiving MED from June 2002 to February 2003 were divided into chronological groups of ten each： A-E. The control group F was ten MED patients treated later by the same medical team （September-October 2006）. All operations were performed by the same team of spinal surgeons with no MED experience before June 2002. We compared groups by operation time, blood loss, complications and need for open surgery after MED failure. Results Operation times by group were： A, （107±14） minutes; B, （85±13） minutes; C, （55±19） minutes; D, （52±12） minutes; E, （51±13） minutes; and F, （49±15） minutes. Blood loss were： A, （131±73） ml; B, （75±20） ml; C, （48±16） ml; D, （44±17） ml; E, （45±18） ml; and F, （45±16） ml. Both operation time and blood loss in groups C, D, E and F were smaller and more stable compared with groups A and B. Japanese Orthopedic Association assessment （JOA） score of each group in improvement rate immediately and one year after operation were as follows （in percentage）： A, （79.8±8.8）/（89.8±7.7）; B, （78.6±8.5）/（88.5±7.8）; C, （80.8±11.3）/（90.8±6.7）; D, （77.7±11.4）/（88.9±9.3）; E, （84.0±8.7）/（89.6±9.0）; and F, （77.8±11.6）/ （86.9±8.4）. Groups showed no statistical difference in improvement rates. Complications developed in three patients in group A, two in group B, and none in the other groups. Conclusions Spinal surgeons performing MED become proficient after 10-20 operations, when their skill becomes fairly sophisticated. Patients＇ improvement rate is the same regardless of surgeons＇ phase of learning curve.

关键词： lumbar disc herniation microendoscopic discectomy learning curve spinal surgeons