Development tendencies of moulding and core sands

Further development of the technology for making moulding and core sands will be strictly limited by tough requirements due to protection of the natural environment. These tendencies are becoming more and more tense, so that we will reach a point when even processes, that from technological point of view fulfill high requirements of the foundry industry, must be replaced by more ecologically-friendly solutions. Hence, technologies using synthetic resins as binding materials will be limited. This paper presents some predictable development tendencies of moulding and core sands. The increasing role of inorganic substances will be noticed, including silicate binders with significantly improved properties, such as improved knock-out property or higher reclamation strength. Other interesting solutions might also be moulding sands bonded by geo-polymers and phosphate binders or salts and also binders based on degradable biopolymers. These tendencies and the usefulness of these binders are put forward in this paper.

Deformation and Development Tendency of Shiliushubao Landslide by Numerical Modeling

On the basis of analysing basic features of Shiliushubao landslide, the landslide＇s deformation and development tendency are quantitatively studied by using FLA^3D program. The results accord with monitoring results. The results are indicated that resevoir impounding accelerates the landslide＇s deformation, and the variation of reservoir water level is key factor of affecting the deformation; The landslide has the characters of pull-behind move ment according to the displacement of the landslide body gradually reducing from leading edge to trailing edge; Excavating and deloading slow down the landslide＇s deformation in the certain degree. On the basis, the deformation developmental tendency of Shiliushubao landslide is predicted by the established simulating model.

Foreign-Related Tax Policy and Regime and Its Tendency of Development

China’s foreign--related tax system was established and developed in theprocess of deepening the reform and opening to the outside world begin-ning in 1979. Since the Third Plenary Session of the Eleventh CentralCommittee of the Chinese Communist Party, to meet the demands of thenew situation of opening to the outside world, several laws were promul-

An analysis on present situation and development of Medical Delivery System in China

Objective:To explore the present situation and development of Medical Delivery System in China.Methods:The data in three Nation Health Service Investigations were compared and analyzed by applying literature meta-analysis,Delphi and cross-sectional investigation,etc.Results:The Medical Ser- vice resource develops fast,and public cost for medical treatment keeps increasing.Organization structure presents a vertical and flat trend.Inhabitant health level rises year by year,and it is hard to resolve the problem of potential medical demand transformed.Conclusion:Medical Delivery System in China has formed,but the development of Medical Service System still exists structural problems in the deeper lay- er.The development trend predicts that the supervision of the government is gradually reinforcing and community health service develops step by step.

Current status and technology development tendency of research reactors in China

The current status and development history of domestic and abroad research reactors (RRs) are mentioned.The representative RRs and their respective technology characteristics are introduced.The utilizations of China's RRs,mainly included as nuclear engineering technology,basic research applications of nuclear technology,teaching and personnel training,are explained.

An Analysis of the Development Tendency of Chinese Folk Music under the Linear Thinking Background

This paper conducts the analysis of the development tendency of Chinese folk music under the linear thinking background. Complexity thinking is to use the basic theory of complexity science, viewpoint and method to the problem of a kind of the thinking, analysis, and to explore ways, it is the general nonlinear and integrity, relational, process as the main characteristics of a modern way of the thinking. China’s traditional music has the extremely glorious history, as it has included the folk music which the working people collective wisdom condenses becomes, that but also has the writer music, the sacred music, palace music, quantity is quite rich as spreads until now work to pass through the long years elutriate that is in our country traditional culture treasure. Under this basis, this paper proposes the novel idea of the issue that will be meaningful.

Analysis of Drought Changes and Drought Mitigation in Xiji County of Ningxia

[Objective] The aim was to study the characteristics of the changes of extreme weather climate incidents such as severe drought in northwest and rainstorm in Xiji County of Ningxia. [Method] Precipitation anomaly percentage was applied to divide drought level and for statistics analysis. Seasonal index, linear tendency, and 5-years gliding average were used to reflect the trend of drought changes. The circulation wave of temporal sequence used polynomial expression to simulate the interannual variation scale. The positive part of the polynomial expression used bar chart to simulate interannual variation scale. [Result] The index of drought season from November to June was large. The general trend of annual drought was increasing. The drought of interannual scale was most serious around 1977, about 15 and 20 years. The drought in recent years went up. The general situation of drought, interannual scale and changes of interannual scales from March to May and from September to October were discussed. Based on the weather at 500 hPa, the first rain in Xiji and the drought-turning-into-rain situation were classified. [Conclusion]These may provide reference value to the prevention and mitigation of drought.

Status Quo and Problems of Underground Space Researches

With the intensifying urbanization and the increasing demands for land resources, urban development is gradually expanding into the underground. Rational development and design of underground space can not only improve use efficiency of land, relieve land use pressure, but also facilitate people's living and improve urban environment. Analysis of the status quo and problems of underground space design researches in China, and the directions of future underground space research and development will contribute to the development and design of underground space. On the basis of reviewing research papers in the past decades, the contents of underground space researches were divided into 10 major categories, the current contents of underground space researches in China and existing problems were analyzed, and it was proposed that the future underground space design researches should be based on traditional research contents and methods, use advanced technologies such as information technology, show the interdisciplinary cooperation, pay attention to human feelings, protection and continuation of cultural context, and adhere to green and sustainable development with consistent innovation and progress.

China＇s Economic Circumstances and Prospects： A Post-Reform Era

China ＇s current economic circumstances are defined by five basic features. （1） For the global economy as a whole, the ＂post-crisis era＂ is ending. （2） China＇s overall economy continues to develop steadily. （3） China has entered a ＂post-reform era.＂ （4） China＇s eastern region and western regions have attained different levels of economic development in terms of capital construction, social development, and household consumption. And （5） China＇ s regional development is still uneven. In the near future, the speed, momentum, environment, priorities and sources of China＇s economic development will see new changes.

Review on the progress of ultra-precision machining technologies

Ultra-precision machining technologies are the essential methods, to obtain the highest form accuracy and surface quality. As more research findings are published, such technologies now involve complicated systems engineering and been widely used in the production of components in various aerospace, national defense, optics, mechanics, electronics, and other high-tech applications. The conception, applications and history of ultra-precision machining are introduced in this article, and the develop- ments of ultra-precision machining technologies, espe- cially ultra-precision grinding, ultra-precision cutting and polishing are also reviewed. The current state and problems of this field in China are analyzed. Finally, the development trends of this field and the coping strategies employed in China to keep up with the trends are discussed.

Current Status and Research Trends of Panax Between 1900—2019:A Bibliometric Analysis

Objective:To investigate the current status and further dtevelopment of Panax genus and6 important individual species including P.notoginseng,P.quinquefolium,P.vietnamensis,P.japonicus,P.stipuleanatus and P.zingiberensis.Methods:The bibliometric analysis was based on the Web of Science core database platform from Thomson Reuters.Totally,7,574 records of scientific research of Panax species published from 1900—2019 were analyzed.The statistical and visualization analysis was performed by CiteSpace and HistCite software.Results:The academic research of Panax species increase promptly.Plant science is the main research field while research and experimental medicine and agricultural engineering will be the further development tendency.Particularly,the discrimination research of P.notoginseng will be the research tendency among Panax species,especially diversity research.In addition,P.vietnamensis deserves more attention in the genus Panax.Conclusion:This research provides a reference for further research of the genus and individual species.