检索结果-南通市图书馆

Integrating machine learning and CALPHAD method for exploring low-modulus near-β-Ti alloys

Rare Metals 2024年第1期43卷 309-323页

作者： Hao Zou Yue-Yan Tian Li-Gang Zhang Ren-Hao Xue Zi-Xuan Deng Ming-Ming Lu jian-xin wang Li-Bin Liu School of Computer Science and Engineering Central South UniversityChangsha 410083China School of Materials Science and Engineering Central South UniversityChangsha 410083China State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China

Traditional theoretical and empirical calculation methods can guide the design of β-and metastable β-alloys for bio-titanium. However, it is still difficult to obtain novel near-β-Ti alloys with low modulus. This study developed a method that combines machine learning with calculation of phase diagrams(CALPHAD) to facilitate the design of near-β-Ti alloys. An elastic modulus database of Ti–Nb–Zr–Mo–Ta–Sn system was constructed first, and then three features(the electron to atom ratio, mean absolute deviation of atom mass, and mean electronegativity) were selected as the key factors of modulus by performing a three-step feature selection. With these features, a highly accurate model was built for predicting the modulus of near-β-Ti alloys. To further ensure the accuracy of modulus prediction, machine learning with the elastic constants calculated was leveraged by CALPHAD database. The root mean square error of the well-trained model can be as low as 6.75 GPa. Guided by the prediction of machine learning and CALPHAD, three novel near-β-Ti alloys with elastic modulus below 50 GPa were successfully designed in this study. The best candidate alloy(Ti–26Nb–4Zr–4Sn–1Mo–Ta) exhibits an ultra-low modulus(36.6 GPa) after cold rolling with a thickness reduction of 20%. Our method can greatly save time and resources in the development of novel Ti alloys, and experimental verifications have demonstrated the reliability of this method.

关键词： Near-β-Ti alloy Machine learning Calculation of phase diagram Low-modulus alloy Feature selection

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Collaborative Matrix Factorization with Soft Regularization for Drug-Target Interaction Prediction

引用

Journal of Computer Science & Technology 2021年第2期36卷 310-322页

作者： Li-Gang Gao Meng-Yun Yang jian-xin wang School of Computer Science and Engineering Central South UniversityChangsha 410083China Hunan Provincial Key Laboratory of Bioinformatics Central South UniversityChangsha 410083China School of Science Shaoyang UniversityShaoyang 422000China

Identifying the potential drug-target interactions(DTI)is critical in drug *** drug-target interaction prediction methods based on collaborative filtering have demonstrated attractive prediction ***,many corresponding models cannot accurately express the relationship between similarity features and DTI *** order to rationally represent the correlation,we propose a novel matrix factorization method,so-called collaborative matrix factorization with soft regularization(SRCMF).SRCMF improves the prediction performance by combining the drug and the target similarity information with matrix *** contrast to general collaborative matrix factorization,the fundamental idea of SRCMF is to make the similarity features and the potential features of DTI approximate,not ***,SRCMF obtains low-rank feature representations of drug similarity and target similarity,and then uses a soft regularization term to constrain the approximation between drug(target)similarity features and drug(target)potential features of *** comprehensively evaluate the prediction performance of SRCMF,we conduct cross-validation experiments under three different *** terms of the area under the precision-recall curve(AUPR),SRCMF achieves better prediction results than six state-of-the-art ***,under different noise levels of similarity data,the prediction performance of SRCMF is much better than that of collaborative matrix *** conclusion,SRCMF is robust leading to performance improvement in drug-target interaction prediction.

关键词： drug-target interaction collaborative matrix factorization soft regularization noisy data

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Decoding the Structural Keywords in Protein Structure Universe

引用

Journal of Computer Science & Technology 2019年第1期34卷 3-15页

作者： Wessam Elhefnawy Min Li jian-xin wang Yaohang Li Department of Computer Science Old Dominion UniversityNorfolkVA 23352U.S.A. Department of Computer Science Central South UniversityChangsha 410083China

Although the protein sequence-structure gap continues to enlarge due to the development of high-throughput sequencing tools,the protein structure universe tends to be complete without proteins with novel structural folds deposited in the protein data bank (PDB)*** this work,we identify a protein structural dictionary (Frag-K)composed of a set of backbone fragments ranging from 4 to 20 residues as the structural "keywords"that can effectively distinguish between major protein *** firstly apply randomized spectral clustering and random forest algorithms to construct representative and sensitive protein fragment libraries from a large scale of high-quality,non-homologous protein structures available in *** analyze the impacts of clustering cut-offs on the performance of the fragment ***,the Frag-K fragments are employed as structural features to classify protein structures in major protein folds defined by SCOP (Structural Classification of Proteins).Our results show that a structural dictionary with N400 4-to 20-residue Frag-K fragments is capable of classifying major SCOP folds with high accuracy.

关键词： protein fragment fold recognition protein structure universe

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Phase Transition and Oxygen Ion Diffusion in （La1-xLnx）2Mo2O9 （Ln=Nd, Gd, x=0.05-0.25） Using Dielectric Relaxation Method

引用

Chinese Journal of Chemical Physics 2008年第3期21卷 270-274页

作者： Qian-feng Fang Zhong Zhuang Xian-ping wang Dan Li jian-xin wang Ningbo Institute of Material Technology and Engineering Chinese Academy of Sciences Ningbo315040 China Key Laboratory of Materials Physics Institute of Solid State Physics Chinese Academy of SciencesHefei 230031 China

Dielectric relaxation method was employed to study the properties of oxygen ion diffusion and phase transition in the oxide-ion conductors （Lal-xLnx）2Mo209 （Ln=Nd, Gd, x=0.05-0.25）. Two dielectric loss peaks were observed： peak Pd at about 600 K and peak P5 around 720 K. Peak Pd is a relaxational peak and associated with the short-range diffusion of oxygen ions, while peak P5 hardly changes its position and dramatically decreases in height with increasing frequency, exhibiting non-relaxational nature. With increasing Ln^3＋ concentration, the heights of peak Ph and Pd increase at first and then decrease after passing a maximum at 15% doping. It is suggested that peak P5 is related to the phase transition of a static disordered state to a dynamic disordered state in oxygen ions/vacancies distribution. It is found that the 15%Gd or 15%Nd doped La2Mo209 samples exhibit the highest conductivity in accordance with the highest height of peak Pd at this doping content.

关键词： Oxide-ion conductor La2Mo2O9 Dielectric relaxation Oxygen ion diffusion

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Controllability and Its Applications to Biological Networks

引用

Journal of Computer Science & Technology 2019年第1期34卷 16-34页

作者： Lin Wu Min Li jian-xin wang Fang-Xiang Wu Division of Biomedical Engineering University of SaskatchewanSaskatoonSK STN 5A9Canada School of Information Science and Engineering Central South UniversityChangsha 410083China Department of Mechanical Engineering University of SaskatchewanSaskatoonSK STN 5A9Canada

Biological elements usually exert their functions through interactions with others to form various types of biological *** ability of controlling the dynamics of biological networks is of enormous benefits to pharmaceutical and medical industry as well as scientific *** there are many mathematical methods for steering dynamic systems towards desired states,the methods are usually not feasible for applying to complex biological *** difficulties come from the lack of accurate model that can capture the dynamics of interactions between biological elements and the fact that many mathematical methods are computationally intractable for large-scale ***,a concept in control theory --controllability,has been applied to investigate the dynamics of complex *** this article, recent advances on the controllability of complex networks and applications to biological networks are *** dynamic models is the prior concern for analyzing dynamics of biological ***,we introduce a widely used dynamic model for investigating controllability of complex *** recent studies of theorems and algorithms for having complex biological networks controllable in general or specific application scenarios are ***,applications to real biological networks manifest that investigating the controllability of biological networks can shed lights on many critical physiological or medical problems,such as revealing biological mechanisms and identifying drug targets,from a systematic perspective.

关键词： biological network network controllability steering node

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

High-brightness photo-injector with standing-wave buncher-based ballistic bunching scheme for inverse Compton scattering light source

引用

Nuclear Science and Techniques 2022年第4期33卷 51-61页

作者： jian-xin wang Kui Zhou Peng Li De-xin Xiao Li-Jun Shan Xu-Ming Shen Yu Liu Zheng Zhou Han-Bin wang Dai Wu Institute of Applied Electronics China Academy of Engineering PhysicsMianyang 621900China

We report our recent progress in the design and simulation of a high-brightness S-band photo-injector with a ballistic bunching scheme aimed at driving an inverse Compton scattering(ICS)X-ray *** adding a short standing-wave buncher between the RF gun and first booster in a conventional S-band photo-injector,electron bunches with a 500 pC charge can be compressed to the sub-picosecond level with very limited input RF power and an unchanged basic layout of the *** dynamics analysis indicates that fine tuning of the focusing strength of the gun and linac solenoid can well balance additional focusing provided by the standing wave buncher and generate a well-compensated transverse *** bunching dynamics simulations with different operating conditions of the buncher show that a buncher with more cells and a moderate gradient is suitable for simultaneously obtaining a short bunch duration and low *** a typical case of a 9-cell buncher with a 38 MV/m gradient,an ultrashort bunch duration of 0.5 ps(corresponding to a compression ratio of>5)and a low emittance of<1 mm mrad can be readily obtained for a 500 pC electron *** feasible ballistic bunching scheme will facilitate the implementation of an ultrashort pulse mode inverse Compton scattering X-ray source on most existing S-band photo-injectors.

关键词： Beam brightness Ballistic bunching Emittance compensation Compton scattering X-ray source

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Small bowel racemose hemangioma complicated with obstruction and chronic anemia:A case report and review of literature

引用

World Journal of Gastroenterology 2020年第14期26卷 1674-1682页

作者： Ji-xin Fu Ya-Nan Zou Zhi-Hao Han Hao Yu xin-jian wang Department of Gastrointestinal Surgery Weihai Central HospitalWeihai 264200Shandong ProvinceChina Department of Anesthesiology Weihai Central HospitalWeihai 264200Shandong ProvinceChina Department of Radiology Weihai Central HospitalWeihai 264200Shandong ProvinceChina

BACKGROUND Gastrointestinal hemangiomas are rare benign *** to the size of the affected vessels,hemangiomas are histologically classified into cavernous,capillary,or mixed-type tumors,with the cavernous type being the most common and racemose hemangiomas being very rare in the *** of uncertain origin and anemia are the main clinical manifestations,and other presentations are *** to the rarity of gastrointestinal hemangiomas and lack of specific manifestations and diagnostic methods,preoperative diagnoses are often delayed or *** SUMMARY We report a 5-year-old girl who presented with abdominal pain,nausea,and vomiting for a duration of 10 *** laboratory studies showed prominent *** tomography and contrast-enhanced computed tomography of the abdomen revealed a small bowel obstruction caused by a giant abdominal *** resection of the ileal lesions was performed through surgery,and the final pathology results revealed a diagnosis of racemose hemangioma complicated by a small bowel obstruction and simultaneous chronic *** The current report will increase the understanding of the diagnosis and treatment of gastrointestinal hemangiomas and provide a review of the related literature.

关键词： Gastrointestinal hemangioma Racemose hemangioma Small bowel obstruction Chronic anemia Computed tomography Case report

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Difluoroboron β-diketonate dye with intense red/near-infrared fluorescence in solutions and solid states

引用

Chinese Chemical Letters 2019年第11期30卷 1939-1941,F0003页

作者： Nan Liu Peng-Zhong Chen jian-xin wang Li-Ya Niu Qing-Zheng Yang Key Laboratory of Radiopharmaceuticals Ministry of EducationCollege of ChemistryBeijing Normal University

Difluoroboronβ-diketonate(BF2bdk)complexes have attracted much attention due to their outstanding photophysical ***,BF2bdk with near-infrared fluorescence usually suffer from emission quenching in solid state due to theπ-πstacking in ***,we report a BF2bdk dye exhibiting donor-acceptor(D-A)structure with the difluoroboron moiety acting as the electron acceptor and the aminonaphthalene as the electron *** processes intense molar extinction coefficient,large Stokes shift and strong fluorescence in red/NIR region in both solution and *** was used for NIR imaging in living cells.

关键词： Difluoroboronβ-diketonate Near-infrared Solid state emission Bioimaging

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Regulation of Ti(C,N)deposition on hot surface of refractory in blast furnace hearth

引用

Journal of Iron and Steel Research International 2024年第6期31卷 1423-1435页

作者： jian Cao Cui wang Jjan-liang Zhang Ke-xin Jiao Guo-hua Zhang State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China

Ti(C,N)concentration was found to be lower on the hearth sidewall of a blast furnace and increased gradually toward the bottom of the blast *** Ti(C,N)protective layer in a blast furnace is ***,the formation of a Ti(C,N)protective layer was promoted by studying the heterogeneous nucleation principle of titanium compounds on different substances and regulation measures for the deposition process of titanium compounds on refractories or *** lattice disregistry between the titanium compounds and the main components in the refractory or the main impurities in the protective layer was calculated using a two-dimensional disregistry equation to study the heterogeneous nucleation principle of titanium *** results revealed that in refractory materials,the heterogeneous nucleation of carbonitride is weak when C,SiO_(2),and Al_(2)O_(3) are used as heterogeneous nucleation substrates,and the heterogeneous nucleation of carbonitride is strong when TiO_(2) and SiC are used as heterogeneous nucleation *** nucleation phases,TiC,TiN,Ti(C_(0.3),N_(0.7)),and Ti(C_(0.5),N_(0.5))have similar heterogeneous nucleation ability in single component refractory,and the type of carbonitride has little effect on the lattice *** impurities in the protective layer as the substrate phases are not conducive to the heterogeneous nucleation of *** CaS was used as the substrate phase,the heterogeneous nucleation ability of carbonitride was the *** carbon and alumina were not conducive to the heterogeneous nucleation of carbonitride,but carbon was more unfavourable than alumina.

关键词： Ti(C,N) Lattice disregistry Lattice constant Heterogeneous nucleation Regulation measure

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Intelligent Electrocardiogram Analysis in Medicine:Data,Methods,and Applications

引用

Chinese Medical Sciences Journal 2023年第1期38卷 38-48页

作者： Yu-Xia Guan Ying An Feng-Yi Guo Wei-Bai Pan jian-xin wang Hunan Provincial Key Lab on Bioinformatics School of Computer Science and EngineeringCentral South UniversityChangsha 410083China Big Data Institute Central South UniversityChangsha 410083China

Electrocardiogram(ECG)is a low-cost,simple,fast,and non-invasive *** can reflect the heart’s electrical activity and provide valuable diagnostic clues about the health of the entire ***,ECG has been widely used in various biomedical applications such as arrhythmia detection,disease-specific detection,mortality prediction,and biometric *** recent years,ECG-related studies have been carried out using a variety of publicly available datasets,with many differences in the datasets used,data preprocessing methods,targeted challenges,and modeling and analysis *** we systematically summarize and analyze the ECGbased automatic analysis methods and ***,we first reviewed 22 commonly used ECG public datasets and provided an overview of data preprocessing *** we described some of the most widely used applications of ECG signals and analyzed the advanced methods involved in these ***,we elucidated some of the challenges in ECG analysis and provided suggestions for further research.

关键词： Electrocardiogram database preprocessing machine learning medical big data analysis

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：