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Effect of Cu content on the glass forming ability of Cu-Zr-Ti system studied by ion beam mixing

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Science China(Technological Sciences) 2015年第4期58卷 750-752页

作者： WANG yuan Yu WANG qi LIU Bai Xin Key Laboratory of Advanced Materials (MOE) School of Materials Science and Engineering Tsinghua University

Based on the Cu-Zr-Ti ternary phase diagram,four sets of Cu-Zr-Ti multilayered films with various compositions of Cu20Zr36Ti44,Cu36Zr31Ti33,Cu49Zr24Ti27,and Cu67Zr16Ti17 were prepared and then the ion beam mixing was carried *** turned out that the increase of Cu content doesn't always have a positive effect on the glass forming *** glass forming ability of Cu49Zr24Ti27 was degraded due to the appearance of a Cs Cl-type B2 structure Cu Zr phase in the eutectic *** experimental observations justify the existence of the Cu Zr phase under the non-equilibrium *** formation mechanisms for the crystalline phase were also discussed in terms of the atomic collision theory.

关键词： glass forming ability ion beam mixing films

Concentration-dependent crystal structure, elastic constants and electronic structure of ZrxTi1-x alloys under high pressure

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Frontiers of physics 2014年第2期9卷 219-225页

作者： Xiao-Li yuan mi-An Xue Wen Chen Tian-qing An College of Mechanics and Materials Hohai University Nanjing 210098 China State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Hohai University Nanjing 210098 China College of Harbour Coastal and Offshore Engineering Hohai University Nanjing 210098 China College of Science Hohai University Nanjing 210098 China

The physical properties of ZrxTi1-x（x=0.0, 0.33, 0.5, 0.67, 0.75 and 1.00） alloys were sinmlated by virtual crystal approximation （VCA） methods which is generally used for disordered solid solutions modeling. The elastic constant, electronic structure and thermal Equation of state （EOS） of disor- dered ZrxTi1-x alloys under pressure are investigated by plane-wave pseudo-potentia1 method. Our simulations reveal increasement of variations of the calculated equilibrium volumes and decrease- ment of Bulk modulus as a function of the alloy compositions. Lattice parameters a and c of alloys with differentZr concentrations decrease linearly with pressure increasing, but the c/avalues are increasing as pressure increases, indicating no phase transitions under pressure from 0 GPa to 100 GPa. The elastic constants and the Bulk modulus to the Shear modulus ratios （B/G） indicate good ductility of Zr, Zr0.33 Ti0.67 Zr0.5Ti0.5, Zr0.75Ti0.25 and Ti, but the Zr0.67Ti0.33 alloy is brittle under 0 K and 0 GPa. The metallic behavior of these alloys was also proved by analyzing partial and total DOS.

关键词： dalloy density functional theory virtual crystal approximation (VCA) mechanics,elastic properties

Application of convolutional neural network-based endoscopic imaging in esophageal cancer or high-grade dysplasia: A systematic review and meta-analysis

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World Journal of Gastrointestinal Oncology 2023年第11期15卷 1998-2016页

作者： Jun-qi Zhang Jun-Jie mi Rong Wang The Fifth Clinical Medical College Shanxi Medical UniversityTaiyuan 030001Shanxi ProvinceChina Department of Gastroenterology Shanxi Provincial People’s HospitalTaiyuan 030012Shanxi ProvinceChina Department of Gastroenterology The Fifth Hospital of Shanxi Medical University(Shanxi Provincial People’s Hospital)Taiyuan 030012Shanxi ProvinceChina

BACKGROUND Esophageal cancer is the seventh-most common cancer type worldwide,accounting for 5%of death from *** of novel diagnostic techniques has facilitated screening,early detection,and improved *** neural network(CNN)-based image analysis promises great potential for diagnosing and determining the prognosis of esophageal cancer,enabling even early detection of *** PubMed,EMBASE,Web of Science and Cochrane Library databases were searched for articles published up to November 30,*** evaluated the diagnostic accuracy of using the CNN model with still image-based analysis and with video-based analysis for esophageal cancer or HGD,as well as for the invasion depth of esophageal *** pooled sensitivity,pooled specificity,positive likelihood ratio(PLR),negative likelihood ratio(NLR),diagnostic odds ratio(DOR)and area under the curve(AUC)were estimated,together with the 95%confidence intervals(CI).A bivariate method and hierarchical summary receiver operating characteristic method were used to calculate the diagnostic test accuracy of the CNN ***-regression and subgroup analyses were used to identify sources of *** A total of 28 studies were included in this systematic review and *** still image-based analysis for the diagnosis of esophageal cancer or HGD provided a pooled sensitivity of 0.95(95%CI:0.92-0.97),pooled specificity of 0.92(0.89-0.94),PLR of 11.5(8.3-16.0),NLR of 0.06(0.04-0.09),DOR of 205(115-365),and AUC of 0.98(0.96-0.99).When video-based analysis was used,a pooled sensitivity of 0.85(0.77-0.91),pooled specificity of 0.73(0.59-0.83),PLR of 3.1(1.9-5.0),NLR of 0.20(0.12-0.34),DOR of 15(6-38)and AUC of 0.87(0.84-0.90)were *** of invasion depth resulted in a pooled sensitivity of 0.90(0.87-0.92),pooled specificity of 0.83(95%CI:0.76-0.88),PLR of 7.8(1.9-32.0),NLR of 0.10(0.41-0.25),DOR of 118(11-1305),and AUC of 0.95(0.92-0.96).CONCLUSION CN

关键词： Esophageal cancer High-grade dysplasia Convolutional neural network Deep learning Systematic review Meta-analysis

The Banded Spherulites of iPP Induced by Pressure Vibration Injection Molding

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Chinese Journal of Polymer Science 2015年第11期33卷 1625-1632页

作者： Ren-xi La qi-xiong Zhou Chao Xia Da-shan mi 张杰 State Key Laboratory of Polymer Materials Engineering College of Polymer Science and Engineering Sichuan University

Isotactic polypropylene（i PP） samples obtained by pressure vibration injection molding（PVIM） and conventional injection molding（CIM） were studied by polarized-light microscopy（PLM）, respectively. It was found that the alternating bright and dark banded spherulites were generated in the transitional region of PVIM parts. It is the first time that the banded spherulites of isotactic polypropylene were observed in polymer processing. What＇s more, the banded spherulites were proved to be constituted of α-form crystal by hot stage polarized-light microscopy（HT-PLM） and wide angle X-ray diffraction（WAXD）. Morphology of the banded spherulites was also studied by scaning electronical microscopy（SEM）.

关键词： α-Form iPP Banded spherulites Vibration injection molding Oscillatory pressure

Prediction and determination of mildew grade in grain storage based on FOA-SVM algorithm

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Food Quality and Safety 2023年第1期7卷 145-151页

作者： Jianghao yuan Fang Tang Zhihui qi Huiyi Zhao Academy of National Food and Strategic Reserves Administration BeijingChina Hebei Agricultural University BaodingChina National Engineering Research Center of Grain Storage and Logistics BiingChina

Grain mildew is a significant hazard that causes food loss and poses a serious threat to human health when ***,effective prediction and determination of mildew grade is essential for the prevention and control of mildew and global food *** the present study,a model for predicting and determining the mildew grade of rice was constructed using logistic regression,back propagation neural network and GS-SVM(a grid search-based support vector machine algorithm)based on laboratory culture data and actual data from a granary,*** results show that the GS-SVM model has a better prediction effect,but the model cannot automatically adjust the parameters and is more subjective,and the accuracy may decrease when the data set ***,this paper establishes a new model for a support vector machine based on a fruit fly optimization algorithm(FOA-SVM),which can achieve automatic parameter search and automatically adjust its parameters to find the best result when the data set changes,with a strong ability of self-adjustment of *** addition,the FOA-SVM converges quickly and the model is *** results of this study provide a technical method for early identification of mildew grade during grain storage,which is beneficial for the prevention and control of rice mildew during grain storage.

关键词： Identification of grain mildew support vector machine fruit fly optimization algorithm grain security

Late Quaternary Tectonic Activity and Slip Rates of Active Faults in the Western Hexi Corridor,NW China

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Journal of Earth Science 2020年第5期31卷 968-977页

作者： Xingwang Liu Daoyang yuan qi Su Bo Zhang Lanzhou National Observatory of Geophysics、Lanzhou 730000 China L anzhou Institute of Geotechnique and Earthquake China Earthquake AdministrationLanzhou 730000China School of Earth Science and Engineering Nanjing UniversityNanjing 210046China

The Yinwashan and Xinminpu faults are located in the Jiuxi Basin in the western end of the Hexi Corridor. The determination of their activity and slip rates is of great significance for understanding the eastward extension of the Altyn Tagh fault. Based on geological and geomorphologic field survey, trench excavation, optically stimulated luminescence dating, we define the fault geometry and kinematic properties of the two faults. Based on fault scarps measurement using differential GPS and 10 Be surface exposure dating, we determined vertical slip rate of 0.09±0.01 mm/yr for the Yinwashan fault and 0.1±0.02 mm/yr for the Xinminpu fault. Using the dips observed in trenches and natural sections, we estimated horizontal shortening rates of 0.05±0.03 and 0.23±0.06 mm/yr, respectively. No significant strike slip motion is observed on these two faults, and we infer that this region was dominated by horizontal shortening in the Late Quaternary. Although the shortening rate is quite low on each individual fault, together with other faults in this area, these two faults have an essential role in transferring slip from the eastern end of the Altyn Tagh fault and in accommodating the northeastward growth of Tibetan Plateau.

关键词： Hexi Corridor qilian Shan slip rate crustal shortening active fault

Non-Targeted Metabolomics Reveals the Metabolic Alterations in Response to Artificial Selective Breeding in the Fast-Growing Strains of Pacific Oyster

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Journal of Ocean University of China 2024年第2期23卷 518-528页

作者： HU Boyang TIAN yuan LIU Shikai LI qi Key Laboratory of Mariculture Ministry of EducationOcean University of ChinaQingdao 266003China Laboratory for Marine Fisheries Science and Food Production Processes Laoshan LaboratoryQingdao 266237China

Pacific oyster(Crassostrea gigas)is one of the most important mollusks cultured all around the *** breeding programs of Pacific oysters in China is initiated since 2006 and developed the genetically improved strain with fast-growing ***,little is known about the metabolic signatures of the fast-growing *** the present study,the non-targeted metabolomics was performed to analyze the metabolic signatures of adductor muscle tissue in one-year old Pacific oysters from fast-growing strain and the wild population.A total of 7767 and 10174 valid peaks were extracted and quantified in ESI^(+)and ESI^(−)modes,resulting in 399 and 381 annotated metabolites,*** and OPLS-DA revealed that considerable separation among samples from fastgrowing strain and wild population,suggesting the differences in metabolic ***,81 significantly different metabolites(SDMs)were identified in the comparisons between fast-growing strain and wild population,based on the strict *** was found that there were highly correlation and conserved coordination among these *** enrichment analysis indicated that the SDMs were tightly related to pantothenate and CoA biosynthesis,steroid hormone biosynthesis,riboflavin metabolism,and arginine and proline *** them,the CoA biosynthesis and metabolism,affected by pantetheine and pantothenic acid,might be important for the growth of Pacific oysters under artificial selective *** study provides the comprehensive views of metabolic signatures in response to artificially selective breeding,and is helpful to better understand the molecular mechanism of fastgrowing traits in Pacific oysters.

关键词： metabolic signature Pacific oyster artificial selection fast-growing trait

Genetics,resistance mechanism,and breeding of powdery mildew resistance in cucumbers(Cucumis sativus L.)

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Horticultural Plant Journal 2023年第4期9卷 603-615页

作者： Jingtao Nie qi yuan Wanlu Zhang Junsong Pan College of Horticulture Science Zhejiang Agriculture&Forestry UniversityHangzhouZhejiang 311300China Key Laboratory of Quality and Safety Control for Subtropical Fruit and Vegetable Ministry of Agriculture and Rural AffairsHangzhouZhejiang 311300China Collaborative Innovation Center for Efficient and Green Production of Agriculture in Mountainous Areas of Zhejiang Province College of Horticulture ScienceZhejiang A&F UniversityHangzhouZhejiang 311300China School of Agriculture and Biology Shanghai Jiao Tong UniversityShanghai 200241China

Cucumber is an important vegetable worldwide,and powdery mildew(PM)is a common and serious disease of *** disease-resistant cucumber varieties is the most advantageous strategy to control this *** recent years,exploration and identification of cucumber PM resistance genes have achieved great advancement,and many genes have been cloned and verified using different ***,the resistance mechanism of cucumber PM is still unclear,and many ambiguities need to be elucidated *** this review,we summarized the research advances in PM resistance in cucumbers,including genetic analysis,quantitative trait locus mapping,map-based cloning,transcriptomics,mlo-mediated PM resistance,and mining of noncoding RNAs involved in ***,the research directions and the problems that need to be solved in the future were discussed.

关键词： Cucumber Powdery mildew resistance Gene mapping Resistance mechanism Molecular breeding mildew resistance locus O(MLO)

Joint Power-Trajectory-Scheduling Optimization in A Mobile UAV-Enabled Network via Alternating Iteration

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China Communications 2022年第1期19卷 136-152页

作者： Xiaohan qi minxin yuan qinyu Zhang Zhihua Yang Communications Engineering Research Center Harbin Institute of TechnologyShen zhen 518055China Peng Cheng Laboratory Shenzhen 518052China

This work focuses on an unmanned aerial vehicle(UAV)-enabled mobile edge computing(MEC) system based on device-to-device(D2D) communication. In this system, the UAV exhibits caching,computing and relaying capabilities to periodically provide specific service to cellular users and D2D receiver nodes in the appointed time slot. Besides, the D2D transmitter can provide additional caching services to D2D receiver to reduce the pressure of the UAV. Note that communication between multi-type nodes is mutually restricted and different links share spectrum resources. To achieve an improved balance between different types of node, we aim to maximize the overall energy efficiency while satisfying the quality-of-service requirements of the cellular *** address this problem, we propose an alternating iteration algorithm to jointly optimize the scheduling strategies of the user, transmitting power of the UAV and D2D-TX nodes, and UAV trajectory. The successive convex approximation, penalty function, and Dinkelbach method are employed to transform the original problem into a group of solvable subproblems and the convergence of the method is proved. Simulation results show that the proposed scheme performs better than other benchmark algorithms, particularly in terms of balancing the tradeoff between minimizing UAV energy consumption and maximizing throughput.

关键词： UAV MEC network D2D joint optimization energy efficiency