半钢纤维帘布压延机三指展边装置控制系统的研制

介绍了用自行设计研制的三指展边装置替代引进意大利鲁道夫半钢纤维帘布压延机入口前的两指扩布器。改进后胶帘布两边纬线疏展均匀,拓展了整体胶帘布宽度,满足了工艺技术要求;提高了自动化程度。

Review on hot spinning for difficult-to-deform lightweight metals

Hot spinning process has attracted significant attention because it can be used to manufacture complex parts, extend the forming limit of materials, decrease forming forces and reduce process chains. In this paper, we review researches on lightweight metals spun at elevated temperatures since they are difficult to deform at room temperature. These metals include light alloys, such as titanium, magnesium and aluminum alloys, and metal composites. Then, the heating methods used in the hot spinning process and the treatment methods employed for the temperature boundary condition in finite element analyses for the process were discussed. Finally, the future development directions for the hot spinning process of lightweight but difficult-to-deform alloys were highlighted.

Deepwater oil and gas field development in South China Sea

This paper focuses on potential development models of future oil and gas exploration in South China Sea. A detailed study of current development models worldwide is performed through some examples of industry installed/ongoing projects and major technical issues encountered during these practice. Key technologies are discussed for the success of field development. Some of the technologies and field development experience can be used for South China Sea project. Several models are studied in field development for different scenarios,including marginal field,large oil field and gas field. With the massive investment activities,continued improved technologies,and rapidly growing pool of professionals,the offshore industry in China will soon encounter a golden period.

Analysis of English Teachers＇ Professional Development in Rural Primary Schools Taking the Surrounding Areas in Linyi as an Example

This thesis tries to explore the problems of the rural English teachers＇ professional development and aims to give some hints on teachers＇ professional development and future teacher training. This thesis makes a survey to 20 rural English teachers from 10 primary schools in the surrounding areas of Linyi City. The survey mainly focuses on the following four aspects： basic situation of the teachers, knowledge of English language and teaching skills, teachers＇ motivation, and self-analysis of their development. With an analysis of the results of the investigation, the author wants to evoke teachers＇ and researchers＇ awareness for improving English language teachers＇ professional development in rural primary schools

China's National Characteristics,Government-Market Relationship and the Development of Its Financial System

This study seeks to determine an effective boundary between government and market in light of modern financial theories.According to the findings of this paper,the relationship between government and market must be conceived of as under the "continuous spectrum of change" resulting from economic development.In practice,an effective frontier between government and market not only transforms continuously with the process of economic development but also demonstrates significant contrasts internationally according to the different national characteristics existing in each country.Determining a frontier between government and market requires that the relationship between the two be embedded into a broader set of institutional environmental constraints that incorporate consideration of the dynamic processes and mechanisms of economic development.The key issue is that government and market act with regard to the principle of comparative advantage as they play their respective roles.

Fully Nonlinear Simulation for Fluid/Structure Impact：A Review

This paper presents a review of the work on fluid/structure impact based on inviscid and imcompressible liquid and irrotational flow. The focus is on the velocity potential theory together with boundary element method （BEM）. Fully nonlinear boundary conditions are imposed on the unknown free surface and the wetted surface of the moving body. The review includes （1） vertical and oblique water entry of a body at constant or a prescribed varying speed, as well as free fall motion, （2） liquid droplets or column impact as well as wave impact on a body, （3） similarity solution of an expanding body. It covers two dimensional （2D）, axisymmetric and three dimensional （3D） cases. Key techniques used in the numerical simulation are outlined, including mesh generation on the multivalued free surface, the stretched coordinate system for expanding domain, the auxiliary function method for decoupling the mutual dependence of the pressure and the body motion, and treatment for the jet or the thin liquid film developed during impact.

A generalized cover renewal strategy for multiple crack propagation in two-dimensional numerical manifold method

Partition of unity based numerical manifold method can solve continuous and discontinuous problems in a unified framework with a two-cover system,i.e.,the mathematical cover and physical cover.However,renewal of the topology of the two-cover system poses a challenge for multiple crack propagation problems and there are few references.In this study,a robust and efficient strategy is proposed to update the cover system of the numerical manifold method in simulation of multiple crack propagation problems.The proposed algorithm updates the cover system with a bottom-up process:1)identification of fractured manifold elements according to the previous and latest crack tip position;and 2)local topological update of the manifold elements,physical patches,block boundary loops,and non-persistent joint loops according to the scenario classification of the propagating crack.The proposed crack tracking strategy and classification of the renewal cases promote a robust and efficient cover renewal algorithm for multiple crack propagation analysis.Three crack propagation examples show that the proposed algorithm performs well in updating the cover system.This cover renewal methodology can be extended for numerical manifold method with polygonal mathematical covers.

Quasi-static Deployment Simulation for Deployable Space Truss Structures

A new method was proposed for quasi-static deployment analysis of deployable space truss structures. The structure is assumed a rigid assembly, whose constraints are classified as three categories:rigid member constraint, joint-attached kinematic constraint and boundary constraint. And their geometric constraint equations and derivative matrices are formulated. The basis of the null space and M-P inverse of the geometric constraint matrix are employed to determine the solution for quasi-static deployment analysis. The influence introduced by higher terms of constraints is evaluated subsequently. The numerical tests show that the new method is efficient.

Immigration and Liberal Egalitarianism

My principal objective in this paper is to examine what position liberal egalitarians should take regarding the issue of immigration. Given that liberal egalitarians grant central importance to individual autonomy and the moral equality of all persons, their rejection of restrictive immigration policies appears to follow from these central normative commitments. Liberal egalitarians such as Joseph Carens and Phillip Cole have argued that those who are committed to individual autonomy and moral equality should advocate for an open borders position in immigration. I argue that it is a serious mistake for liberal egalitarians to advocate open national borders and that borders should instead be strategically regulated to reduce global economic inequalities through immigration policies systematically integrated into development programs for the poorest and most vulnerable countries. Open borders would create an open market for immigration slots to choice countries of destination, which out of practical necessity would have to delimit the number of new immigrants. It is well known in migration studies that those who are more educated, young, and have more resources are more likely to migrate than the very young, the elderly, the infirm, and the poorest individuals. Those left behind in developing countries suffer serious negative consequences from the emigration of the most highly educated, capable, and talented individuals in their society. I then argue that liberal egalitarians should grant particular moral consideration to the world＇s poorest and most vulnerable and that immigration policies strategically designed to prioritize their needs are actually more consistent with the dual commitments of individual autonomy and moral equality than an open borders position. I propose three principles of global justice that are consistent with liberal egalitarianism that should guide transnational moral obligations. I end the paper by arguing that two of these principles can be used to justify restricted immigration policies that would enable developed countries to partially discharge some of their moral obligations to developing countries while enhancing the autonomy of the world＇s most vulnerable people.

A Spatio-Temporal Odyssey Around the Concepts of Sustainable Development and Corporate Social Responsibility： Boundaries to Be Determined？

The aim of this research is to analyze the emergence of the concepts of sustainable development （SD） and corporate social responsibility （CSR） in companies in time and space. A spatio-temporal reading will indicate the most important socio-political and environmental events that have emerged with these two concepts. In order to complete the odyssey, a spatio-temporal analysis has retraced the epistemological evolution of these latter, whilst at the same time remarking the appropriation that has been made by the different institutional and organizational actors. The historical and epistemological reviews tell us that these two concepts, which came into existence almost 80 years, have indefinite outlines; one can be substituted for the other. However, thanks to this odyssey, we have reduced the boundaries even further between sustainable development and social responsibility and shown their theoretic and historical association. The perspective adopted shows that the concept of corporate social responsibility is closely connected to that of sustainable development. This connection means that researchers in management science are faced with more new problem issues reaching further than the simple lack of conceptual consensuses.

Peripheral Challenge in Container Port System:A Case Study of Pearl River Delta

The growth of peripheral ports to dominant hubs has been well documented in North America and Europe,and has led to the elaboration of several theoretical models.However,although changes in containerization growth have been taking place in the South and East Asia in recent years,particularly in China,only a few studies have fo-cused on this region.The Pearl(Zhujiang) River Delta(PRD) has a typical port system with hub and peripheral ports,and provides an excellent case for studying the Peripheral Challenge.This paper introduces the theoretical evidence of the Hayuth model and analyzes the evolution of the container port system in the PRD with five phases:1) phase I:preconditions for change and phase II:initial container port development in the 1970s and early 1980s;2) phase III:diffusion,consolidation,and port concentration in the middle and late 1980s;3) phase IV:the load center in the 1990s;and(4) phase V:the Peripheral Challenge since the late 1990s.The results illustrate that the Shenzhen port presents mounting challenges to the Hong Kong port,descending from a transshipment hub of China to a regional load center of Southeast China.Furthermore,this paper explores five points that have led to the evolution of the port system in the PRD:1) competition in the regional port systems;2) different interested parties;3) shift of investment strategies of in-ternational terminal operators;4) integration of shipping networks and reorganization of carriers;and 5) cost-based competition.

Three Critical Issues in Sustainable Development Studies and the Transition Development of China

The core issue for China transition development in the next 30 years is to shift from the quantity growth model to the quality improvement model. The paper introduces the research progress in three key areas of sustainable development studies since the 1990s. It is pointed out that there is a well-being thresh-old at which the margin utility of economic growth for human well-being will decline, that there is an ecological limit beyond which more economic growth in terms of physical scale will be impossible, and that the creation of human well-being is related not only to the amount but also to the structure and efficiency of public expenditure from government. After an in-depth discussion on facts, origins and policy implications of each issue, some theory and policy thinking with long-lasting significance are raised for the transition development of China.

The Impact of Trade Facilitation on Economic Development： A Case of East African Community （EAC）

This study examined the impact of trade facilitation on economic development, particularly the impact of customs environment on trade flows over the period from 1995 to 2010. Five countries of the East African Community （EAC）, namely, Tanzania, Kenya, Uganda, Rwanda, and Burundi, are involved. The study employs a gravity model for estimating bilateral trade flows between the EAC partner states. The ordinary least square （OLS） technique is adopted and applied for the regression analysis by using the Stata 10.0 software. Results suggest that, the customs environment of the importer is significant and possesses a strongly positive impact on East African trade flows. Results also find that the customs environment of the exporter is insignificant, even though it shows a negative relationship with the East African trade flows, hence a negative determinant. East African countries have to improve their customs environment, especially when undertaking an importation, in order to boost the overall trade flow in the block. They should also improve other trade facilitation indicators, such as port efficiency, regulatory environment, and infrastructure. The aid for trade, in terms of technical and financial assistance, should also be enhanced for the development of infrastructure, including roads, railways, ports, bridges, and border posts.

The Application of the Fixed-point Theory in Jacketed Solution of Singularly Perturbed Nonlinear Problem

In this paper,the fixed_point theorem is used to estimated an asymptotic solution of initial value problems for a class of third nonlinear differential equations which has double initial_layer properties. We obtain the uniformly valid asymptotic expansion of any orders including boundary layers.

Inter-border Integration of Fashion Design and Contemporary Art

With the development of economy and society, every comer of the world＇ s cultural and spiritual civilization are closely linked together, At the same time, the clothing and contemporary art are in the big tide of mutual penetration and mutual influence. Contemporary art has influenced on the costume design. Costume design can play their own advantages in art tide, toward a higher point. The passage from the clothing design and other fields of contemporary art in the process of cross-border integration explores the future development trend of garment design.

Chinese Experiences in Addressing Rural Extreme Poverty and Marginalization

Seeking to alleviate and eradicate Bao （the minimum livelihood guarantee system） extreme povertY, the Chinese government has extended Di to the entire rural sector. It has also enhanced agricultural policies and strengthened its promotion of rural socioeconomic development. In more-developed regions of the country, the Di Bao program-in combination with integrated urban and rural social insurance and public services-has significantly reduced rates of poverty and financial vulnerability, and additional employment-promotion policies have created opportunities for Di Bao recipients to achieve incomes above the poverty-line. However, because of the high number of extremely poor households in disproportionately poor areas and the paucity of locally-available financial resources there, the intensity of intervention is still insufficient. Inadequate coordination of policies and shortcomings in the targeting of subsidies have resulted in both under-coverage and welfare-leakage as well. Consequently, in China＇s efforts to eradicate extreme poverty, increasing the effectiveness of poverty-reduction strategies in poor areas remains a key prioritY.

Driving Factors of Coordinated Development in Chinese Border Cities:A Case Study of Lincang City in Southwest China

In the context of the“Belt and Road Initiative”,the sustainable development of border cities is paramount for facilitating intergovernmental exchanges.Using the system dynamics approach,we integrated border policy factors to create the Border City Coordinated Development(BCCD-SD)model,encompassing three dimensions:Economic,Social,and Resource-Environment.Furthermore,a comprehensive evaluation indicator,the City Coordinated Development Index(CCDI),was devised.Using Lincang City in Southwest China as a case study,this article examines the trends in city development under three scenarios:Inertial Development,Rapid Development,and Green Development.The research findings demonstrate that the model adeptly captures trends in the city coordinated development indicators.Among the three scenarios,the rapid development scenario stands out,yielding the most favorable economic indicators,superior public infrastructure,and the highest employed population.However,the rapid development path,which is heavily focused on economic growth,intensifies resource and environmental pressures,giving rise to sustainability challenges.In contrast,although the green development scenario trails slightly in economic performance compared to rapid development,it fosters a larger urban population and transition of the employed population into citizens while excelling in resource and environmental aspects.Overall,the CCDI attains its highest score under the green development scenario,surpassing those of rapid and inertia development,signifying superior city development coordination along the green path.This scenario effectively combines economic growth,social progress,and resource-environment protection.This study also emphasizes the pivotal role of ports in the coordinated development of border cities and underscores the necessity of expediting the transition from a“gateway”economy to a“port+”economy.One objective of this article is to encourage border cities to serve as more effective windows to the outside world,promote regional coordination,and achieve high-quality development.

清代鸭绿江右岸荒地开垦经过

我国鸭绿江右岸从水源域到江口城的绵长广阔地区，历史上多有朝代更迭。清代的封禁、边禁，使这一地区的开垦出现过旗兵屯垦、韩民越垦、流民私垦和展边招垦等形式。旗兵屯垦是按下承种，拨给耕牛，助给农器口粮，另外也有报领荒地等做法。突发的自然灾害和外敌入侵，使韩民越垦在清代呈迅速增长之势，其垦种往往视法令之紧弛，由朝耕暮归而春越秋还，而伐木建屋久住，有许多人后来成了占山户的佃农。清代流民潜入鸭绿江右岸屡屡以有碍围场、危害旗人等为由而遭限制，但终如破堤洪水，莫能禁逐。在大批流民偷垦的驱动下，清统治者出于经济的与政治的考虑，不得不反复派员勘查，开禁展边招垦。清代鸭绿江右岸荒地的开垦是个复杂的历史过程，是众多民族共同参与的重大活动，它开发了我国辽东边疆地区的土地资源，促进了该地区的经济发展，形成了该地区的政治建制，激励了该地区各民族的团结，是历史之一大进步。

An Inverse Problem for a Nonlinear Evolution Equation

This paper deals with an inverse problem for the unknown source term in a nonlinear evolution equation. Firstly, the authors change the initial boundary value problem (IBVP) for the equation into a Cauchy problem for a certain nonlinear evolution equation. Secondly, using the semigroup theory, the authors establish the existence and uniqueness of the solution for the inverse problem. Finally, they take advantage of the fixed point method for some contraction mapping and get the solvability of the inverse problem for the evolution equation.

On the Asymptotic Property of Solution for Some Nonlinear Evolution Equation of Second Order

In the article we show the decay of the solution for some nonlinear evolution equation of second order by using a difference inequality.