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后扶贫时代教育扶贫政策优化的理论证成与路径选择

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教育与经济 2021年第5期37卷 3-10,31页

作者：戴妍陕西师范大学民族教育学院西安710062

教育对相对贫困治理具有关键性作用,优化教育扶贫政策是为后扶贫时代教育扶贫行动探寻路径的最佳战略抉择。贫困的“多维性”“动态性”“相对性”与“持久性”构成了后扶贫时代教育扶贫政策优化的逻辑前提。在后扶贫时代,教育扶贫开发... 详细信息

教育对相对贫困治理具有关键性作用,优化教育扶贫政策是为后扶贫时代教育扶贫行动探寻路径的最佳战略抉择。贫困的“多维性”“动态性”“相对性”与“持久性”构成了后扶贫时代教育扶贫政策优化的逻辑前提。在后扶贫时代,教育扶贫开发道路的理论优势构成了教育扶贫政策优化的逻辑起点,贫困与教育反贫困的理论关照揭示了其政策优化的理念探寻,教育扶贫与乡村振兴有效衔接的理论支点指明了其政策优化的价值理路,立体交融式战略格局的理论图景表达了其政策优化的发展走向。在后扶贫时代,教育扶贫政策要基于“共识”“共融”“共生”“共建”“共享”五个维度全面升级,趟出政策优化的创新路径。

关键词：后扶贫时代相对贫困教育扶贫乡村振兴政策优化

Dissolution-regrowth synthesis of SiO_2 nanoplates and embedment into two carbon shells for enhanced lithium-ion storage

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Chinese Journal of Chemical Engineering 2018年第7期26卷 1522-1527页

作者： Zhijun yan Xiangcun Li Xiaobin Jiang Le Zhang yan dai Gaohong He State Key Laboratory of Fine Chemicals Chemical Engineering Department Dalian University of Technology

In this work, SiO2 nanoplates with opened macroporous structure on carbon layer （C-mSiO2） have been obtained by dissolving and subsequent ingrowing the outer solid SiO2 layer of the aerosol-based C-SiO2 double-shell hollow spheres. Subsequently, triple-shell C-mSiO2-C hollow spheres were successfully prepared after coating the C- mSiO2 templates by the carbon layer from the carbonization of sucrose. When being applied as the anode material fur lithium-ion batteries, the C-mSiO2-C triple-shell hollow spheres deliver a high capacity of 501 mA. h.g- 1 after 100 cycles at 500 mA.g-1 （based on the total mass of silica and the two carbon shells）, which is higher than those of C-mSiO2 （391 mA.h.g 1） spheres with an outer porous SiO2 layer, C-SiO2-C （370 mA-h.g-1） hollow spheres with a middle solid Si02 layer, and C-SiO2 （319.8 mA·h-g-1） spheres with an outer solid SiO2 layer. In addition, the battery still delivers a high capacity of 403 mA· h· g- 1 at a current density of 1000 mA· g- 1 after 400 cycles. The good electrochemical performance can be attributed to the high surface area （246.7 m2·g- 1 ） and pore volume （0.441 cm3· g-1） of the anode materials, as well as the unique structure of the outer and inner carbon layer which not only enhances electrical conductivity, structural stability, but buffers volume change of the intermediate SiO2 layer during repeated charge-discharge processes. Furthermore, the SiO2 nanoplates with opened macroporous structure facilitate the electrolyte transport and electrochemical reaction.

关键词： Silica nanoplates Carbon shell Macroporous Lithium-ion battery

Development and application of hyaluronic acid in tumor targeting drug delivery

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Acta Pharmaceutica Sinica B 2019年第6期9卷 1099-1112页

作者： Zhijian Luo yan dai Huile Gao Ultrasound Diagnosis Department of the Affiliated Hospital of Southwest Medical University Southwest Medical UniversityLuzhou 646000China Department of Pharmacy of the Affiliated Hospital of Southwest Medical University Southwest Medical UniversityLuzhou 646000China Key Laboratory of Drug Targeting and Drug Delivery System of the Education Ministry Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial TechnologyWest China School of PharmacySichuan UniversityChengdu 610041China

Hyaluronic acid(HA)is a natural polysaccharide that has gained much attention due to its biocompatibility,enzyme degradation capacity and active tumor targeting *** receptor,CD44,is overexpressed in many kinds of cancers and is associated with tumor progress,infiltration and ***,many researchers have developed various HA-based drug delivery systems for CD44-mediated tumor *** this review,we systemically overview the basic theory of HA,its receptor and hyaluronidase,then we categorize the studies in HA-based drug delivery systems according to the functions of HA,including tumor-targeting materials,enzyme-sensitive biodegradable modality,pHsensitive component,reduction-sensitive component,and the gel ***,the perspective is discussed.

关键词： Hyaluronic acid Tumor-active targeting CD44 Tumor microenvironment Reduction-sensitive Enzyme-sensitive Nanoparticles

Solution of the Dirac Equation for Ring-Shaped Modified Kratzer Potential

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Communications in Theoretical Physics 2007年第3X期48卷 431-434页

作者： CHENG yan-Fu dai Tong-Qing College of Electronics and Information Engineering South-Central University for Nationalities Wuhan 430074 China

We propose a new exactly solvable potential which is Formed by modified Kratzer potential plus a new ring-shaped potential η cot^2 θ/r^2 The solutions of the Dirac equation with equal scalar and vector ring-shaped modified Kratzer potential are found by using the Nikiforov-Uvarov method. The nonrelativistic limit of the energy spectrum has been discussed.

关键词： Dirac equation solution ring-shaped modified Kratzer potential

Obesity and colorectal cancer risk: A meta-analysis of cohort studies

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World Journal of Gastroenterology 2007年第31期13卷 4199-4206页

作者： Zhe dai yan-Cheng Xu Li Niu DepartmentofEndocrinology ZhongnanHospitalWuhanUniversityWuhan430071HubeiProvinceChina

TO evaluate the association between obesity and colorectal cancer risk. METHODS： We searched PubMed, EMBASE, and the Cochrane Library up to January 1, 2007. Cohort studies permitting the assessment of causal association between obesity and colorectal cancer, with clear definition of obesity and well-defined outcome of colorectal cancer were eligible. Study design, sample size at baseline, mean follow-up time, co-activators and study results were extracted. Pooled standardized effect sizes were calculated.

关键词： Obesity Colorectal cancer Waist-to-hipratio Waist circumference Weight Cohort study Metaanalysis

Singular Quasilinear Elliptic Problems with Indefinite Weights and Critical Potential

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Acta Mathematicae Applicatae Sinica 2012年第1期28卷 157-164页

作者： Gao JIA Qing ZHAO Chun-yan dai College of Science University of Shanghai for Science and TechnologyShanghai 200093China

The Dirichlet problem for a quasilinear sub-critical inhomogeneous elliptic equation with critical potential and singular coefficients, which has indefinite weights in RN, is studied in this paper. We discuss the corresponding eigenvalue problems by the variational techniques and Picone＇s identity, and obtain the existence of non-trivial solutions for the inhomogeneous Dirichlet problem by using Hardy inequality, Mountain Pass Lemma in conjunction with the property of eigenvalues.

关键词： Picone's identity Hardy inequality critical potential Mountain Pass Lemma

Large eddy simulation for wind field analysis based on stabilized finite element method

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2011年第4期12卷 278-290页

作者： Cheng HUANG yan BAO dai ZHOU Jin-quan XU School of Naval Architecture Ocean and Civil Engineering Shanghai Jiao Tong University Shanghai 200240 China

In this paper,a stabilized finite element technique,actualized by streamline upwind Petrov-Galerkin(SUPG) stabilized method and three-step finite element method(FEM),for large eddy simulation(LES) is developed to predict the wind flow with high Reynolds *** form of LES motion equation is combined with the SUPG stabilized term for the spatial finite element *** explicit three-step scheme is implemented for the temporal *** the numerical example of 2D wind flow over a square rib at Re=4.2×105,the Smagorinsky's subgrid-scale(SSGS) model,the DSGS model,and the DSGS model with Cabot near-wall model are applied,and their results are analyzed and compared with experimental ***,numerical examples of 3D wind flow around a surface-mounted cube with different Reynolds numbers are performed using DSGS model with Cabot near-wall model based on the present stabilized method to study the wind field and compared with experimental and numerical ***,vortex structures for wind flow around a surface-mounted cube are studied by present numerical *** and satisfactory results are obtained,which are consistent with most of the measurements even under coarse mesh.

关键词： Large eddy simulation(LES) Subgrid-scale model Stabilized finite element method(FEM) Unstructured grid Wind flow

Weighted and Resonance Quasilinear Elliptic Problems with Jumping Nonlinearities

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Acta Mathematicae Applicatae Sinica 2018年第2期34卷 438-450页

作者： Gao JIA Chun-yan dai Jie CHEN College of Science University of Shanghai for Science and Technology Shanghai 200093 China Shanghai Tianshan Second Middle School Shanghai 200336 China Xiang Yifu Rong Second Middle School Changsha 410000 China

In this paper, the existence of a nontrivial solution for a class of quasilinear elliptic equations with a disturbance term in a weighted Sobolev space is proved. The proofs rely on Galerkin method, Brouwer＇s theorem... 详细信息

关键词： weighted Sobolev space quasilinear elliptic equation Oalerkin method

Robust dual-channel correlation algorithm for complex weak target detection with wideband radar

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Journal of Systems Engineering and Electronics 2023年第5期34卷 1130-1146页

作者： dai yan LIU Dan LI Chuanming WEI Shaopeng HU Qingrong Beijing Institute of Radio Measurement Beijing 100854China College of Oceanography and Space Informatics China University of Petroleum(East China)Qingdao 257099China Defense Technology Academy of China Aerospace Science and Industry Corporation Limited Beijing 100070China

In the scene of wideband radar,due to the spread of target scattering points,the attitude and angle of view of the target constantly change in the process of *** is difficult to predict,and the actual echo of multiple scattered points is not fully matched with the transmitted ***,it is challenging for the traditional matching filter method to achieve a complete matching effect in wideband echo *** addition,the energy dispersion of complex target echoes is still a problem in radar target detection under broadband ***,this paper proposes a wideband target detection method based on dualchannel correlation processing of range-extended *** method fully uses the spatial distribution characteristics of target scattering points of echo signal and the matching characteristics of the dual-channel point extension function *** radial accumulation of wideband target echo signal in the complex domain is realized through the adaptive correlation processing of a dual-channel echo *** accu-mulation effect of high matching degree is achieved to improve the detection probability and the performance of wideband ***,electromagnetic simulation experiments and measured data verify that the proposed method has the advan-tages of high signal to noise ratio(SNR)gain and high detection probability under low SNR conditions.

关键词： wideband radar target detection dual-channel cor-relation