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Exploring differentiated improvement strategies of cultivated land quality in China

Frontiers of Agricultural Science and Engineering 2024年第2期11卷 282-291页

作者： Wenguang CHEN xiangbin kong Yubo LIAO College of Land Science and Technology China Agricultural UniversityBeijing 100193China

Quality is the core feature of cultivated land. In the face of deteriorating cultivated land quality and growing food demand, improving cultivated land quality is a top priority for guaranteeing the sustainable use of resources and national food security. Cultivated land quality in the new era can be considered in four dimensions: suitability, contiguity, resistance and ecological stress. Cultivated land suitability in China shows a decreasing trend from east to west, cultivated land contiguity is high in the north-east and low in the south-west. In terms of cultivated land resistance, the number of strongly and weakly resistant cropping fields is small and spatially clustered. Cultivated land with ecological stress is mainly located in the northern region. Based on the current situation of cultivated land quality and the strategic needs of national high-quality development, China's future goals for improving cultivated land quality include four aspects: promoting the sustainable use of resources,improving the economic benefits of farming, coping with extreme meteorological disasters and meeting the transition of the food *** the backdrop of a volatile international environment and high domestic demand for food, China should guarantee a safe supply of staples, a stable supply of animal feed and a moderate supply of high-nutrient food. In the future, China should create three major food production spaces: highstandard, low-to medium-yield, and marginal cultivated land. China urgently needs to construct three paths to implement the goal of improving cultivated land quality, namely the development of high-standard cultivated land with the core of spatial optimization, resilience enhancement and scale coupling,the transformation of low-to medium-yield cultivated land with the core of obstacle elimination, tenure adjustment, ecological sustainable, and the conservation development of marginal cultivated land with a focus on sustainable use.

关键词： China cultivated land quality differentiated improvement food security

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比较教育研究差异性逻辑的实践向度与价值尺度

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外国教育研究 2024年第4期51卷 14-30页

作者：王超孔令帅上海师范大学国际与比较教育研究院上海200234

在西方中心的普遍主义价值导向影响下,非西方国家比较教育研究长期以来过度追求教育的同一性而忽视了差异性,造成了研究视域的窄化、方法论民族主义的僵化和服务教育改革能力的弱化,自身也陷入学术依附的发展困境。对此,将坚持教育的差... 详细信息

在西方中心的普遍主义价值导向影响下,非西方国家比较教育研究长期以来过度追求教育的同一性而忽视了差异性,造成了研究视域的窄化、方法论民族主义的僵化和服务教育改革能力的弱化,自身也陷入学术依附的发展困境。对此,将坚持教育的差异性作为本体论前提,关注教育关系的复杂性作为方法论基础,尊重教育发展的主体性作为实践论要求,实现教育利益的共享性作为价值论旨趣的差异性逻辑,为比较教育研究提供了一种可能的新思路。比较教育学者需要坚持“在世界之中平等对话”的实践向度,通过转换研究视域,更新研究方法,增强学术自主,提升服务能力,才能将差异性逻辑转化为具体的方法论原则,并在尊重教育差异中推动实现全球教育共同发展。比较教育研究提倡差异性逻辑,并不是要将其绝对化,还需遵循求真、向善和爱美的价值尺度,朝向教育本身探索教育规律,推动全球教育善治实现共同福祉,加强教育生态正义共建清洁美丽世界。

关键词：比较教育同一性逻辑差异性逻辑实践向度价值尺度

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Dynamical distribution of continuous service time model involving non-Maxwellian collision kernel and value functions

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Chinese Physics B 2024年第9期33卷 340-348页

作者： Minfang Zhao Lingting kong Miao Liu Shaoyong Lai School of Mathematics and Statistics Yili Normal UniversityYining 835000China Institute of Applied Mathematics Yili Normal UniversityYining 835000China School of Mathematics Southwestern University of Finance and EconomicsChengdu 611130China

The distribution of continuous service time in call centers is investigated.A non-Maxwellian collision kernel combining two different value functions in the interaction rule are used to describe the evolution of continuous service time,*** the statistical mechanical and asymptotic limit methods,Fokker–Planck equations are derived from the corresponding Boltzmann-type equations with non-Maxwellian collision *** steady-state solutions of the Fokker–Planck equation are obtained in exact *** experiments are provided to support our results under different parameters.

关键词： kinetic theory service time Fokker–Planck equation value function

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教师评价数据化的生成隐忧与价值旨归

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教育研究 2024年第8期45卷 149-159页

作者：王超孔令帅上海师范大学国际与比较教育研究院上海200234

人类社会正迈向数字时代,数据在现代教育发展中的重要性不断增强。数字时代世界各国的中小学教师评价日益强调充分利用数字技术和教育测评工具,通过数据反映教师的专业价值,衡量教师的专业效能。对教师的教育实践进行数据化监控,并将教... 详细信息

人类社会正迈向数字时代,数据在现代教育发展中的重要性不断增强。数字时代世界各国的中小学教师评价日益强调充分利用数字技术和教育测评工具,通过数据反映教师的专业价值,衡量教师的专业效能。对教师的教育实践进行数据化监控,并将教师的教育价值进行数据化换算,数字时代的教师评价正引导教师成为数据化的教师。教师的数据化作为数据化教师的生成逻辑,受来自国家、市场和专业三重逻辑的交织形塑。在国家的治理逻辑下,基于表现的教师问责制在增强教师发展效能的同时,产生了一种透明性的悖论。在市场的效率逻辑下,私人资本在提升教师评价效率的同时,导致教师面临一种数字异化的隐忧。在专业的知识生产逻辑下,数字技术在推动教师专业知识迭代更新的同时,令教师面临去专业化的风险。走出数据崇拜的迷雾,是推动现代教师评价解放教师主体性的关键。需要坚持数据为用的基本原则,以解决使用什么样的数据、如何使用数据评价等问题,赋能教师主体性建构;坚持价值为善的伦理旨趣,以公共性思维推动数据化评价,促进教师主体性发展;坚持治理为要的行动取向,以数据正义理念健全数据化评价制度,实现教师主体性解放。

关键词：教师评价数据化的教师教师的数据化生成逻辑

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中国式现代化背景下教师教育高质量发展的内在逻辑、本质特征与实践路径

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国家教育行政学院学报 2024年第8期320卷 11-21,63页

作者：孔令帅王超上海师范大学上海200233

高质量发展是教师教育领域践行中国式现代化的逻辑反映和具体方式,对加快建成教育强国具有战略性、基础性、全局性作用。中国式现代化背景下的教师教育高质量发展,具有严密的政治、经济、文化和技术逻辑,表现为以党的全面领导为根本保证... 详细信息

高质量发展是教师教育领域践行中国式现代化的逻辑反映和具体方式,对加快建成教育强国具有战略性、基础性、全局性作用。中国式现代化背景下的教师教育高质量发展,具有严密的政治、经济、文化和技术逻辑,表现为以党的全面领导为根本保证,以实现共同富裕为目标追求,以优秀文化为重要根基,以数字技术为新型动力。中国式现代化的关键在于中国特色,中国特色彰显了我国教师教育高质量发展鲜明的人民性、实践性、全面性和开放性等本质特征。未来,需要从价值引领、制度保障、文化赋能、技术支撑及内外联动等维度入手,才可能消解教师教育高质量发展存在的壁垒。

关键词：中国式现代化教师教育高质量发展内在逻辑本质特征实践路径

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Dealuminated Hβ zeolite for selective conversion of fructose to furfural and formic acid

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Green Energy & Environment 2024年第2期9卷 311-320页

作者： Rui Li Qixuan Lin Junli Ren Xiaobao Yang Yingxiong Wang Lingzhao kong State Key Laboratory of Pulp and Paper Engineering School of Light Industry and EngineeringSouth China University of TechnologyGuangzhou510640China Institute of Coal Chemistry Chinese Academy of Sciences27 South Taoyuan RoadTaiyuan030001China CAS Key Laboratory of Low-Carbon Conversion Science and Engineering Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai201210China School of Environmental Science and Technology Suzhou University of Science and Technology Suzhou Jiangsu215009China

The fructose-to-furfural transformation is facing major challenges in the selectivity and high efficiency. Herein, we have developed a simple and effective approach for the selective conversion of fructose to furfural using Hβ zeolite modified by organic acids for dealuminization to regulate its textural and acidic properties. It was found that citric acid-dealuminized Hβ zeolite possessed high specific surface areas, wide channels and high Brønsted acid amount, which facilitated the selective conversion of fructose to furfural with a maximum yield of 76.2% at433 K for 1 h in the γ-butyrolactone(GBL)-H_(2)O system, as well as the concomitant formation of 83.0% formic acid. The^(13)C-isotope labelling experiments and the mechanism revealed that the selective cleavage of C1–C2 or C5–C6 bond on fructose was firstly occurred to form pentose or C5 intermediate by weak Brønsted acid, which was then dehydrated to furfural by strong Brønsted acid. Also this dealuminized Hβ catalyst showed the great recycling performance and was active for the conversion of glucose and mannose.

关键词： Fructose Dealuminated-Hb zeolite Selective conversion Furfural

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A TRUST-REGION METHOD FOR SOLVING TRUNCATED COMPLEX SINGULAR VALUE DECOMPOSITION

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Journal of Computational Mathematics 2024年第4期42卷 999-1031页

作者： Jiaofen Li Lingchang kong Xuefeng Duan Xuelin Zhou Qilun Luo School of Mathematics and Computing Science Guangxi Colleges and Universities Key Laboratory of Data Analysis and ComputationGuangxi Key Laboratory of Automatic Detecting Technology and InstrumentsGuilin University of Electronic TechnologyCenter for Applied Mathematics of Guangxi(GUET)Guilin 541004China School of Mathematical Sciences South China Normal UniversityGuangzhou 510000China School of Mathematics and Computing Science Guilin University of Electronic TechnologyGuilin 541004China School of Mathematics and Computing Science Guangxi Colleges and Universities Key Laboratory of Data Analysis and ComputationGuilin University of Electronic TechnologyCenter for Applied Mathematics of Guangxi(GUET)Guilin 541004China School of Mathematics and Statistics Yunan UniversityKunming 650000China

The truncated singular value decomposition has been widely used in many areas of science including engineering,and statistics,*** this paper,the original truncated complex singular value decomposition problem is formulated as a Riemannian optimiza-tion problem on a product of two complex Stiefel manifolds,a practical algorithm based on the generic Riemannian trust-region method of Absil et *** presented to solve the underlying problem,which enjoys the global convergence and local superlinear conver-gence *** experiments are provided to illustrate the efficiency of the proposed *** with some classical Riemannian gradient-type methods,the existing Riemannian version of limited-memory BFGS algorithms in the MATLAB toolbox Manopt and the Riemannian manifold optimization library ROPTLIB,and some latest infeasible methods for solving manifold optimization problems,are also provided to show the merits of the proposed approach.

关键词： Truncated singular value decomposition Riemannian optimization Trust-region method

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Acoustic Velocity-Based Inversion of the Physical Properties of Sea Ice in the Central Arctic Region

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Journal of Ocean University of China 2024年第5期23卷 1213-1220页

作者： kong Yadong XING Junhui XU Haowei XU Chong Key Laboratory of Submarine Geosciences and Prospecting Techniques Ministry of Education(MOE)and College of Marine GeosciencesOcean University of ChinaQingdao 266100China Laboratory for Marine Mineral Resources Qingdao Marine Science and Technology CenterQingdao 266071China

Studying the Arctic sea ice contributes to a comprehensive understanding of the climate system in polar regions and offers valuable insights into the interplay between polar climate change and the global climate and *** of the key research aspects is the investigation of the temperature,salinity,and density parameters of sea ice to obtain essential *** the 11th Chinese National Arctic Research Expedition,acoustic velocity was measured on an ice core at a short-term ice station,however,temperature,salinity,and density were not *** the present work,we utilized a genetic algorithm to invert these obtained acoustic velocity data to sea ice temperature,salinity,and density parameters on the basis of the relationship between acoustic velocity and the physical properties of Arctic summer sea *** validated the effectiveness of this inversion procedure by comparing its findings with those of other *** results indicate that within the normalized depth range of 0.43-0.94,the ranges for temperature,salinity,and density are -0.48--0.29℃,1.63-3.35,and 793.1-904.1 kg m^(-3),respectively.

关键词： acoustic velocity Arctic sea ice inversion of sea ice properties genetic algorithm

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Remarkable enhancement of gas selectivity on organosilica hybrid membranes using urea-modulated metal-organic framework nanoparticles

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Frontiers of Chemical Science and Engineering 2024年第2期18卷 83-92页

作者： Yayun Zhao Dechuan Zhao Chunlong kong Yichao Lin Xuezhen Wang Liang Chen Key Laboratory of Advanced Fuel Cells and Electrolyzers Technology of Zhejiang Province Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China University of Chinese Academy of Sciences Beijing 100049China Collaboration Innovation Center for Tissue Repair Material Engineering Technology China West Normal UniversityNanchong 637009China

Metal-organic framework/organosilica hybrid membranes on tubular ceramic substrates have shown great potential for the implementation of membrane technology in practical gas separation projects due to their higher permeance compared to commercial ***,the selectivities of the reported membranes are ***,we have incorporated urea-modulated metal-organic frameworks into organosilica membranes to greatly enhance its separation *** urea-modulated metal-organic frameworks exhibit less-defined edges of crystallographic facets and high defect *** can be well-dispersed in the organosilica layer,which substantially suppresses the interfacial defects between metal-organic frameworks and organosilica,which is beneficial for improving the selectivity of membranes for gas *** results have shown that the enhanced ideal selectivity of H_(2)/CH_(4) was 165 and that of CO_(2)/CH_(4) was 43,with H_(2) permeance of about 1.25×10^(−6) mol·m^(−2)·s^(−1)·Pa^(−1) and CO_(2) permeance of 3.27×10^(−7) mol·m^(−2)·s^(−1)·Pa^(−1) at 0.2 MPa and 25℃.In conclusion,the high level of hybrid membranes can be used to separate H_(2)(or CO_(2))from the binary gas mixture H_(2)/CH_(4)(or CO_(2)/CH_(4)),which is important for gas separation in practical ***,the simple and feasible modulation of metal-organic framework is a promising strategy to tune different metal-organic frameworks for membranes according to the actual demands.

关键词： ZIF-8 nanocrystals urea organosilica hybrid membrane enhanced separation performance

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Numerical investigation of sinusoidal pulsating gas intake to intensify the gas-slag momentum transfer in the top-blown smelting furnace

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International Journal of Minerals,Metallurgy and Materials 2024年第2期31卷 301-314页

作者： Zhanghao Wan Shiliang Yang Desong kong Dongbo Li Jianhang Hu Hua Wang State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization Kunming University of Science and TechnologyKunming 650093China Southwest Copper Branch Yunnan Copper Co.Ltd.Kunming 650102China

The variation characteristics of bubble morphology and the thermal-physical properties of bubble boundary in the top-blown smelting furnace were explored by means of the computational fluid dynamics *** essential aspects of the fluid phase(e.g.,splashing volume,dead zone of copper slag,and gas penetration depth)were explored together with the effect of sinusoidal pulsating gas intake on the momentum-transfer performance between *** results illustrated that two relatively larger vortices and two smaller vortices appear in the bubble waist and below the lance,*** expansion of larger ones as well as the shrinking of smaller ones combine to cause the contraction of the bubble *** to the results of the case with a fixed gas injection velocity(V_(g)=58 m/s),the splashing volume and dead zone volume of the slag under the V_(g)=58+10sin(2πt)condition are reduced by 24.9%and 23.5%,respectively,where t represents the instant *** penetration depth and slag motion velocity of the latter are 1.03 and 1.31 times high-er than those of the former,respectively.

关键词： top-blown smelting furnace pulsed flow volume of fluid penetration depth splashing volume

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