Molecular simulation study on the evolution process of hydrate residual structures into hydrate

The clathrate hydrate memory effect is a fascinating phenomenon with potential applications in carbon capture,utilization and storage(CCUS),gas separation,and gas storage as it can accelerate the secondary formation of clathrate hydrate.However,the underlying mechanism of this effect remains unclear.To gain a better understanding of the mechanism,we conducted molecular dynamic simulations to simulate the initial formation and reformation processes of methane hydrate.In this work,we showed the evolution process of hydrate residual structures into hydrate cages.The simulation results indicate that the residual structures are closely related to the existence of hydrate memory effect,and the higher the contribution of hydrate dissociated water to the hydrate nucleation process,the faster the hydrate nucleation.After hydrate dissociation,the locally ordered structures still exist after hydrate dissociation and can promote the formation of cluster structures,thus accelerating hydrate nucleation.Additionally,the nucleation process of hydrate and the formation process of clusters are inseparable.The size of clusters composed of cup-cage structures is critical for hydrate nucleation.The residence time at high temperature after hydrate decomposition will affect the strength of the hydrate memory effect.Our simulation results provide microscopic insights into the occurrence of the hydrate memory effect and shed light on the hydrate reformation process at the molecular scale.

Curriculum Reform of“Woven Fabric Structure Design and Application”in Higher Vocational College Based on Industry-College Partnerships

The curriculum“Woven Fabric Structure Design and Application”is the core curriculum of textile majors in higher vocational colleges,which plays a very important role in the cultivation of students’vocational ability and professional quality.The curriculum reform of“Woven Fabric Structure Design and Application”through the deep cooperation of industry-college partnerships,the comprehensive analysis of the major training objectives and graduation requirements,the redesign of the curriculum teaching content,the improvement of the teaching method and the examination method,has achieved good results.

Research on the Reform of the Course“Reading of Concrete Structure Plan and Construction Drawings”Under the Background of“Promoting Teaching and Learning Through Competitions”

The inherent teaching approach can no longer meet the demands of society.In this paper,current issues within the teaching landscape of architectural engineering technology in higher vocational colleges as well as the policies and teaching demands that formed the basis of this model were analyzed.The study shows the importance of the implementation of the teaching model“promoting teaching and learning through competitions.”This model puts emphasis on the curriculum and teaching resources,while also integrating the teaching process and evaluation with competition.These efforts aim to drive education reform in order to better align with the objectives of vocational education personnel training,while also acting as a reference for similar courses.

China's Infrastructure Development and Supply-Side Structural Reforms

Despite significant improvements in transport, energy and information communication technology （ICT） infrastructures, inadequacies still exist in China＇s infrastructure development in light of emerging demand and industrial transition and upgrade. China lags far behind advanced economies such as the United States, Germany and Japan in terms of the quality of transport infrastructures except railroad,＂ electricity infrastructure is insufficient and service efficiency needs improvement; ICT infrastructure requires all-round upgrade and gaps in Internet bandwidth are striking. This paper suggests that, based on the needs of supply-side structural reform, China must reform its investment and financing systems to enhance the efficiency of infrastructure investment. Efforts must be made to enhance air transport and port infrastructure to support industrial upgrade; to develop the energy Internet to address emerging demands; and to forge a new generation of ICT infrastructure with industrial Internet as the priority to prepare China for the new round of industrial competition.

STUDY OF REENGINEERING THE STOCK EQUITY STRUCTURE IN CHINESE STATE-OWNED ENTERPRISE REFORM

In this paper,it is first briefly described the basic situation and current policies of state owned enterprise reform in China.Then the major issues in the reform process are identified,the possible solutions in terms of reengineering stock equity structure and state share circulation are discussed,and finally some suggestions are made for the further state owned enterprise reform.Basing on the theory on the modern corporation system,relevant experiences of market economy nations and the practice of Chinese enterprise system reform.The approaches to determine the proportion of state share in the future corporations are proposed.Since the public ownership is not ideologically appropriate,the establishment of social security fund and mutual fund investment companies are suggested as new and acceptable pattern of public ownership.It is believed that these companies will be the major institutional shareholders in the future corporations.Their stock equity structure would mainly consist of institutional shareholders,which will be both consistent with international norms of modern corporations and with socialist public ownership with Chinese characteristics.

Study of the impacts of upstream natural gas market reform in China on infrastructure deployment and social welfare using an SVM-based rolling horizon stochastic game analysis

Natural gas is expected to play a much more important role in China in future decades, and market reform is crucial for its rapid market penetration. At present, the main gas fields, pipelines and liquefied natural gas(LNG) infrastructure are mainly monopolized by large state-owned companies, and one of the important market reform policies is to open up LNG import rights to smaller private companies and traders. Therefore, in the present study, a game theoretical model is proposed to analyze and compare the impacts of different market structures on infrastructure deployment and social welfare. Moreover, a support vector machine-based rolling horizon stochastic method is adopted in the model to simulate real LNG price fluctuations. Four market reform scenarios are proposed considering different policies such as business separation, third-party access(TPA) and their combinations. The results indicate that, with third-party access(TPA)entrance into the LNG market, the construction of LNG infrastructure will be promoted and more gas will be provided at lower prices, and thus the total social welfare will be improved greatly.

Influencing Factors and Dynamic Mechanism of Industrial Structure from the Perspective of Supply-side Reform

The supply-side reform is an important measure for the high-quality development of China's economy in the new era. The purpose of this paper is to explore the mechanism and influence of technological progress,human capital,consumption demand,resource endowment and government intervention on the adjustment and upgrading of industrial structure,and to deepen the understanding of supply-side reform.

Highly controlled structured catalysts for on-board methanol reforming

The on-board methanol steam reforming(MSR) has long been considered as an effective approach to insitu produce hydrogen for fuel cell vehicles(FCVs). However, the conventional MSR catalyst pellets suffer from easy breakage during the vehicle movement, leading to increased pressure drop and reduced system stability. Herein, we introduce an integrated method to prepare the highly controlled structured catalysts based on coupled processes: direct prototyping the structured substrate using digital light processing(DLP) 3D printing technology, in-situ dynamic crystallization of active components assisted by magnetic resonance imaging(MRI) and calcination. The synthesized catalyst owns a gradient layer of active component, and exhibits better MSR performance, higher mechanical strength, reduced pressure drop, higher Cu dispersion and better adhesion of active compounds when compared with the conventional powder and pellet catalysts. The demonstrated successful application proves the feasibility of developed method,which has great potential to be used for preparing precisely other monolithic catalysts with customized structures.

Analysis of the Changes in Rural Chinese Family Structure since Reform and Opening Up

This article uses data from censuses since 1982 to reveal changes in the family structure of rural China since the launch of reform and opening up and against the backdrop of institutional relocation,social transformation and an aging population.Since the advent of reform and opening up,rural family structure and its changes can be divided into two phases.Before the 1990 s,the household contract responsibility system was implemented,labor in rural villages was still mainly engaged in farming,and the number of nuclear families remained stable with a steady rise.After the 1990 s,as reform progress deepened,substantial numbers of young and middle-aged laborers in rural villages began to relocate into non-farming sectors and aging in rural villages rose.As those born in the early days of the family planning policy gradually matured,family structure was directly affected and changed in new ways and forms not seen before.Vocational divisions of labor among the parents of young families and married offspring emerged and the significance of cooperation for family economy and daily life between parents and offspring rose in importance.Also,the prevalence of immediate families with three generations climbed while the standard nuclear families declined,the ratio of middle-aged couples with young children that worked outside the home increased,the function of middle-aged and senior parents in the upbringing of infants and children enhanced,and the commonness of incomplete family types such as only grandparents with grandchildren increased.During this phase,the number of seniors living alone surged to the point of becoming a matter worthy of attention.

Supply-Side Structural Reform, Digital Economy and Corporate Default Risk

In recent years, a lot of corporate defaults have had an impact on the capital market. How to prevent corporate default risks has become an important topic of concern for the academic community, enterprises and the government. We took China’s A-share listed companies from 2012 to 2018 as a sample, and used the double difference method to analyze the impact of supply-side structural reforms on corporate default risks. We found that supply-side structural reforms have reduced the risk of corporate default, and the inhibitory effect has gradually increased. In the relationship between supply-side structural reforms and corporate default risks, corporate financing capabilities have played an intermediary role. Supply-side structural reforms can improve the company’s endogenous financing capabilities, thereby reducing the risk of corporate default. However, we also found that the mediating effect of a company’s exogenous financing capability is not significant. At the same time, the regression results show that the digital economy can play a regulatory role. It can not only actively regulate the relationship between supply-side structural reforms and corporate default risks, but also mediate the mediating effect of corporate endogenous financing capabilities. The results of this article provide some evidence for the synergy between supply-side structural reforms and the digital economy.

Influencing factors analysis of hard limestone reformation and strength weakening under acidic effect

Roof disaster has always been an important factor restricting coal mine safety production.Acidic effect can reform the rock mass structure to weaken the macroscopic strength characteristics,which is an effective way to control the hard limestone roof.In this study,the effects of various factors on the reaction characteristics and mechanical properties of limestone were analyzed.The results show that the acid with stronger hydrogen production capacity after ionization(pK_(a)<0)has more prominent damage to the mineral grains of limestone.When pKa increases from−8.00 to 15.70,uniaxial compressive strength and elastic modulus of limestone increase by 117.22%and 75.98%.The influence of acid concentration is manifested in the dissolution behavior of mineral crystals,the crystal defects caused by large-scale acid action will lead to the deterioration of limestone strength,and the strength after 15%concentration reformation can be reduced by 59.42%.The effect of acidification time on limestone has stages and is the most obvious in the initial metathesis reaction stage(within 60 min).The key to the strength damage of acidified limestone is the participation of hydrogen ions in the reaction system.Based on the analytic hierarchy process method,the influence weights of acid type,acid concentration and acidification time on strength are 24.30%,59.54% and 16.16%,respectively.The research results provide theoretical support for the acidification control of hard limestone roofs in coal mines.

How to Optimize the Structure of Agricultural Products in the Context of Reform of the Supply Front?

Based on reform of the supply front,this paper analyzes the main constraints on China's current structure of agricultural products,including irrational allocation of resources between agricultural products,prominent problems concerning agricultural product quality and safety,disconnection between market demand and agricultural product R&D,and low processing capacity of agricultural products. Based on summing up the experience of the countries with developed agriculture,this paper proposes the path and mechanism for the optimization of structure of agricultural products in China: optimizing resource allocation of agricultural products; improving the quality of agricultural products; enhancing the R&D capacity of agricultural enterprises; promoting the processing and conversion capacity of agricultural products; perfecting the policy support and subsidy mode.

Chinese Comprehensive Rural Reform: Institutional Vicissitude, Theoretic Framework and Content Structure

The social and economic development level of rural areas, the productivity of agriculture and the life quality of farmers were always the greatest concerns of Chinese Central Government. Therefore, the research related to rural areas, agriculture and farmers had remained as the prominent parts for a long period and would continue to be prominent in the future to build China into a moderately prosperous nation in an all-round way. Chinese rural area had constantly experienced three significant system reforms since 1978, namely the reform of rural management system, the rural tax and fee reform and the rural comprehensive reform. This paper attempted to analyze the theoretic framework and the content structure of the comprehensive rural reform since it was the higher stage of rural institutional vicissitude, which had changed the governance and operation system and thus promoted the great changes to fundamental social and economic system in rural areas. The theoretic framework of comprehensive rural reform covered three aspects in its content, namely the rural governance theory, the government function theory and the public finance theory. The comprehensive rural reform was a complicated system engineering with multiple dimensions and targets mainly including rural political restructuring, rural economic restructuring and rural public products allocation restructuring. The reform had focused on enhancing the vitality of agricultural and rural development, breaking through the urban and rural binary system, and further reducing the disparity between cities and countrysides, so as to realize the urban-rural integration. It was necessary to clarify and understand the key mechanism and intrinsic logic of the rural comprehensive reform, which was helpful to establish the foundation constituted by scientific methodology to implement the reform and evaluation criterion to judge the reform performance.

Reform of Rural Planting Structure in China since the Reform and Opening-up and Its Main Problems

Based on the oral interview of six different types of rural families in Houdian Village,Longkou City,Shandong Province,combined with the adjustment of rural reform policies,this paper analyzed reasons for the reform of rural planting structure in China since the reform and opening-up and elaborated the general outline of the reform of the planting structure.From the changes in farmers' attitudes,it explored the achievements and shortcomings of rural reform in the past 40 years.It discussed problems such as shortage of labor resources and vacancy of family education of teenagers in the current sustainable development of rural areas.Finally,it came up with some recommendations for the development of rural areas.

Structured Perovskite-Based Oxides: Use in the Combined Methane Reforming

The behavior of metallic structured perovskite-based catalysts was evaluated in the combined methane reforming reaction with CO2-O2. The reaction conditions were established by varying the reaction temperature and reactor input composition in the range of 650 to 850℃ and CH4/CO2 ratio 1 to 5, respectively. The results of the catalytic tests at 750℃ showed a positive effect of the metallic structure, producing higher conversions and H2/CO ratios in the products compare to that obtained with the powder catalyst.

An Analysis on the Teaching Reform of Data Structure Course in China

For the course of“Data Structures”,this paper introduces the importance and existing problems of the data structure course.Through the literature and the current teaching in major universities,the existing teaching methods and their disadvantages are analyzed.The authors put forward teaching reform suggestions and designed an online course platform.

Supply-Side Structural Reforms and China's Potential Economic Growth Rate

This paper examines the effect of supply-side structural reforms on China＇s potential economic growth rate in the coming decade according to the data the authors have gathered. Under the rapid growth scenario with the implementation of supply-side structural reforms, China＇s potential economic growth rate will reach an average of 6.5% and 5.8% respectively in the 13th Five-year Plan （2016-2020） and 14th Five-year Plan （2021-2025） periods. These rates are 0.2 and 0.3 percentage points higher, respectively, than that under the baseline scenario with the inertia of historic trends. In implementing supply-side structural reforms, China must transform governmental functions, break monopolies, create a comprehensive competitive market environment, foster the creation of pro-innovation mechanisms, refocus on quality and efficiency, and raise capital utilization and labor productivity.

Methods and Countermeasures for Urban Agricultural Supply-Side Structural Reform in the New Era

Based on the theoretical basis of structural reform of agricultural supply side, the status quo and existing problems of urban agricultural supply side in Tian- jin under the new normal were analyzed. On this basis, the paper analyzed the paths of urban agricultural supply-side structural reform separately from the perspec- tives of factors, investment structure and system innovation, and proposed specific policies and opinions on the structural reform of urban agricultural supply side, pro- viding the theoretical basis and realistic basis for the sustainable development of ur- ban agriculture.

Forecast Grain “Three Quantities” Based on Grey GM (1, 1) and Promote the Structural Reform of Grain Supply Side

As a special product, the cultivation and production of grain directly affect the consumption of people, which has an important influence on the development of social economy and the national economy and people’s livelihood. Firstly, the present situation of grain production is analyzed, and the problems facing the structural reform of grain supply side in China are analyzed from grain output and its import and export volume. Secondly, we use grey GM (1, 1) model to predict grain output and consumption, grain import and export volume and all kinds of grain crops output in China, and then analyze the future trend of grain production in China. Finally, we put forward construction of grain branding, rational allocation of grain planting varieties, construction of traceability system for grain production, further grain processing and development of “Internet agriculture” industrial model to promote structural reform of grain supply side.

Structural reform of agricultural supply side under the concept of green development

The structural reform of the agricultural supply side is the fundamental way to solve the current agricultural problems in China and an important way to increase the income of farmers. The concept of green development refers to engaging in economic activities under the premise of fully protecting the environment and rationally utilizing resources. It is a good strategy to achieve harmony between man and nature on the basis of respecting the laws of nature. Based on the concept of green development, this paper attempts to explore the implementation path of structural reform of agricultural supply side from four aspects: industrial structure change, agricultural operation subject innovation, agricultural product brand construction and government safeguard measures. Agriculture is the foundation of the national economy.Effectively solving the obstacles in agricultural development and realizing agricultural modernization is of great value for improving China’s overall economic level, maintaining social stability and increasing farmers’ income.