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Globally Proper Saddle Point in Ic-Cone-Convexlike Set-Valued Optimization Problems

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Acta Mathematica Sinica,English Series 2009年第11期25卷 1921-1928页

作者： guo lin yu San Yang LIU Institute of Information and Systems Science The North University for Ethnics Yinchuan 750021 P. R. China Department of Applied Mathematics Xidian University Xi'an 710071 P. R. China

The existence conditions of globally proper efficient points and a useful property of ic- cone-convexlike set-valued maps are obtained. Under the assumption of the ic-cone-convexlikeness, the optimality conditions for globally proper efficient solutions are established in terms of Lagrange multipliers. The new concept of globally proper saddle-point for an appropriate set-valued Lagrange map is introduced and used to characterize the globally proper efficient solutions. The results which are obtained in this paper are proven under the conditions that the ordering cone need not to have a nonempty interior.

关键词： set-valued map ic-cone-convexlikeness globally proper efficiency saddle point

Optimality Conditions for Generalized Convex Nonsmooth Uncertain Multi-objective Fractional Programming

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Journal of the Operations Research Society of China 2023年第4期11卷 809-826页

作者： Xiao Pan guo-lin yu Tian-Tian Gong School of Mathematics and Information Science North Minzu UniversityYinchuan750021NingxiaChina

This paper aims at studying optimality conditions of robust weak efficient solutions for a nonsmooth uncertain multi-objective fractional programming problem(NUMFP).The concepts of two types of generalized convex function pairs,called type-I functions and pseudo-quasi-type-I functions,are introduced in this paper for(NUMFP).Under the assumption that(NUMFP)satisfies the robust constraint qualification with respect to Clarke subdifferential,necessary optimality conditions of the robust weak efficient solution are *** optimality conditions are obtained under pseudo-quasi-type-I generalized convexity ***,we introduce the concept of robust weak saddle points to(NUMFP),and prove two theorems about robust weak saddle *** main results in the present paper are verified by concrete examples.

关键词： Multi-objective fractional programming Robust weak efficient solution Generalized convex function Optimality condition Saddle point

Surgical management of 143 patients with adult primary retroperitoneal tumor

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World Journal of Gastroenterology 2007年第18期13卷 2619-2621页

作者： yuan-Hong Xu Ke-Jian guo R.en-Xuan guo Chun-lin Ge yu-lin Tian San-Guang He Department of General Surgery The First Affiliated Hospital of China Medical UniversityShenyang 110001 Liaoning Province China

AIM： To analyze the surgical management of adult primary retroperitoneal tumors （APRT） and the factors influencing the outcome after operation. METHODS： Data of 143 cases of APRT from 1990 to 2003 in the First Affiliated Hospital of China Hedical University were evaluated retrospectively. RESULTS： A total of 143 cases of APRT were treated surgically. Among them, 122 （85.3%） underwent complete resection, 16 （11.2%） incomplete resection, and 3 （3%） surgical biopsies. Twenty-nine （20.2%） underwent tumor resection plus multiple organ resections. Ninety-five malignant cases were followed up for 1 mo to 5 years. The 1-year, 3-year, and 5-year survival rates of the patients subject to complete resection was 94.9%, 76.6% and 34.3% and that of patients with incomplete resection was 80.4%, 6.7%, and 0%, respectively （P 〈 0.001）. The Cox multi-various regression analysis showed the completeness of tumor, sex and histological type were associated closely with local recurrence. CONCLUSION： Sufficient preoperative preparation and complete tumor resection play important roles in redudng recurrence and improving survival.

关键词： Retroperitoneal neoplasms Surgical procedure OperaUve Recurrence

The enhancement of performance and imbibition effect of slickwater-based fracturing fluid by using MoS_(2)nanosheets

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Petroleum Science 2023年第4期20卷 2187-2201页

作者： Hang Xu yuan Li guo-lin yu Sa-Sa Yang Bo-Jun Li Fu-Jian Zhou Er-Dong Yao Hao Bai Zhi-yu Liu Unconventional Petroleum Research Institute China University of Petroleum(Beijing)Beijing102249China National Key Laboratory of Petroleum Resources and Engineering China University of Petroleum(Beijing)Beijing102249China

Slickwater-based fracturing fluid has recently garnered significant attention as the major fluid for volumetric fracturing;however,lots of challenges and limitations such as low viscosity,poor salt tolerance,and possible formation damage hinder the application of the conventional simple slickwater-based fracturing *** addition,nanomaterials have proven to be potential solutions or improvements to a number of challenges associated with the *** this paper,molybdenum disulfide(MoS_(2))nanosheets were chemically synthesized by hydrothermal method and applied to improve the performance of conventional slickwater-based fracturing ***,the microstructure characteristics and crystal type of the MoS_(2)nanosheets were analyzed by SEM,EDS,TEM,XPS,and Raman spectroscopy ***,a series of evaluation experiments were carried out to compare the performance of MoS_(2)nanosheet-modified slickwater with the conventional slickwater,including rheology,drag reduction,and sand ***,the enhanced imbibition capacity and potential mechanism of the nanosheet-modified slickwater were systematically *** results showed that the self-synthesized MoS_(2)nanosheets displayed a distinct ultrathin flake-like morphology and a lateral size in the range of tens of *** the nano-composites,each MoS_(2)nanosheet plays the role of cross-linking point,so as to make the spatial structure of the entire system more ***,nanosheet-modified slickwater demonstrates more excellent properties in rheology,drag reduction,and sand *** nanosheet-modified slickwater has a higher apparent viscosity after shearing 120 min under 90℃ and 170 s^(−1).The maximum drag reduction rate achieved 76.3%at 20℃,and the sand settling time of proppants with different mesh in the nano-composites was *** imbibition experiments showed that the gel-breaking fluid of nanosheet-modified slickwater exhibited excellent capability of

关键词： Slickwater-based fracturing fluid MoS_(2)nanosheet Performance evaluation spontaneous imbibition Climbing film

The Changes in the Awareness of Cervical Cancer Prevention and the Acceptability of HPV Vaccines among Women after Their Introduction in China

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Biomedical and Environmental Sciences 2019年第11期32卷 864-868页

作者： MA Quan Fu guo yu lin YAN Bin FAN Chun Li XU Meng DAI Xuan WANG Ying ZOU Miao WANG Chao Nan WU Xu Feng Department of Gynecologic Oncology Maternal and Child Health Hospital of Hubei ProvinceWuhan 430000HubeiChina Cervical Cancer Control Center of Hubei Province Wuhan 430000HubeiChina

Cervical cancer is a form of malignant tumor that seriously threatens women’s health. In China,according to the cancer statistics, 98,900 new cervical cancer cases and 30,500 deaths due to cervical cancer were estima... 详细信息

关键词： HPV The Changes in the Awareness of Cervical Cancer Prevention and the Acceptability of HPV Vaccines among Women after Their Introduction in China China

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地震资料自适应高分辨率处理方法定量研究

地球物理学报 2017年第9期60卷 3587-3600页

作者：郭锐林鹤余刚张宇生中国石油集团东方地球物理公司新兴物探开发处河北涿州072750

分辨率是地震资料处理的重要问题,常以子波能量展布和震荡长度来定量分析,决定于地震资料的主频和频宽.越来越复杂的勘探对象要求高分辨率算法提供更丰富的波形和相位信息.实践表明自适应滤波方法在提高地震资料分辨率的同时,处理结果... 详细信息

分辨率是地震资料处理的重要问题,常以子波能量展布和震荡长度来定量分析,决定于地震资料的主频和频宽.越来越复杂的勘探对象要求高分辨率算法提供更丰富的波形和相位信息.实践表明自适应滤波方法在提高地震资料分辨率的同时,处理结果表现出更丰富的信息.在对APES方法的自适应滤波原理进行理论探讨和模型分析基础上,提出了加权方式的改进算法(WAPES).通过统计实验,对改进前后的方法在信噪比和分辨率方面的表现进行了定量分析,同时设计典型模型试验来证明新方法的适用性.最后,改进后的方法应用于实际工区资料的处理,取得了很好的应用效果.

关键词：分辨率自适应方法带宽信噪比薄层

Investigation on Precipitation Hardening High Strength IF Steel Sheet for Automotive Application

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Journal of Iron and Steel Research International 2011年第S1期18卷 742-746页

作者： WANG Xu,LIU Ren-dong,WANG Ke-qiang,guo Jin-yu,lin Li,XU Rong-jie (Automobile and Home Appliance Steel Institute of Ansteel Company Limited Technology Centre,Anshan 114009,Liaoning,China) Ansteel Co Ltd Technol Ctr Automobile & Home Appliance Steel Inst Anshan 114009 Liaoning Peoples R China

High strength IF steel sheets with sufficient formability had been extensively used in automotive *** this paper,a new type of high strength cold-rolled IF steel with higher carbon and niobium contents was *** plastic and continuous annealing were performed on thermo-mechanical *** transformation points were tested by thermal expansion *** microscopy and transmission election microscope (TEM) were used to analyze the microstructure and the secondary precipitates of the *** results showed,the ductibility temperature range was from 950℃ to 1250℃ and the transformation points were 887℃ and 913℃ *** grain size of this steel was smaller than that of conventional high strength IF *** the mean time,there were many fine Nb(C,N) precipitates distributed in the intra-granular regions and the PFZ (precipitate free zone) were formed in the neighborhood of grain *** to the unique micro-structural feature,the yield strength and the yield ratio of the steel were decreased while the tensile strength was *** the increasing of the annealing temperature,the strength decreased,the total elongation A50,r-value at 15% strain and n-value were all *** order to obtain the favorable mechanical properties,the skin-pass rolling rate should be chosen at 0.6-0.8%.

关键词： high strength IF steel precipitation hardening grain refinement precipitate free zone (PFZ)

Nanostructured ZnO/BiVO_(4)I-scheme heterojunctions for piezocatalytic degradation of organic dyes via harvesting ultrasonic vibration energy

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 488-497页

作者： Yiling Li Xiaoyao yu Yingjie Zhou Yao lin Ying Wu Key Laboratory of the Ministry of Education for Advanced Catalysis Materials College of Chemistry and Materials ScienceZhejiang Normal UniversityJinhua 321004China

BiVO_(4)porous spheres modified by ZnO were designed and synthesized using a facile two-step *** resulting ZnO/BiVO_(4)composite catalysts have shown remarkable efficiency as piezoelectric catalysts for degrading Rhodamine B(RhB)unde mechanical vibrations,they exhibit superior activity compared to pure *** 40wt%ZnO/BiVO_(4)heterojunction composite displayed the highest activity,along with good stability and *** enhanced piezoelectric catalytic activity can be attributed to the form ation of an I-scheme heterojunction structure,which can effectively inhibit the electron-hole ***,hole(h+)and superoxide radical(·O_(2)^(-))are proved to be the primary active ***,ZnO/BiVO_(4)stands as an efficient and stable piezoelectric catalyst with broad potential application in the field of environmental water pollution treatment.

关键词： piezoelectric catalytic heterojunction dye degradation ultrasonic vibration

Unraveling the significance of cobalt on transformation kinetics,crystallography and impact toughness in high-strength steels

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 380-390页

作者： Yishuang yu Jingxiao Zhao Xuelin Wang Hui guo Zhenjia Xie Chengjia Shang Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing 100083China School of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China

This work reveals the significant effects of cobalt(Co)on the microstructure and impact toughness of as-quenched highstrength steels by experimental characterizations and thermo-kinetic *** results show that the Co-bearing steel exhibits finer blocks and a lower ductile-brittle transition temperature than the steel without ***,the Co-bearing steel reveals higher transformation rates at the intermediate stage with bainite volume fraction ranging from around 0.1 to *** improved impact toughness of the Co-bearing steel results from the higher dense block boundaries dominated by the V1/V2 variant ***,the addition of Co induces a larger transformation driving force and a lower bainite start temperature(BS),thereby contributing to the refinement of blocks and the increase of the V1/V2 variant *** findings would be instructive for the composition,microstructure design,and property optimization of high-strength steels.

关键词： high-strength steel cobalt transformation kinetics crystallography impact toughness