PurposeThe purpose of this paper is to summarize the advances in grey system theory research and various application achievements in science and engineering. At the same time, it commemorates the 40th anniversary of the birth of grey system theory and the 10th anniversary of Grey Systems–Theory and Application.Design/methodology/approachFirstly, the innovations of theoretical research in grey system theory were summarized and some of the widely recognized new results are briefly described. By searching and combing the research results of grey system theory in China national knowledge infrastructure (CNKI) database and Web of Science by Institute for Scientific Information (ISI), this paper shows the rapid development trend of grey system theory in the past 40 years, and the successful applications of grey system theory in the fields of social sciences, natural sciences and engineering technologies.FindingsMore than 227 thousands literature were found by input 10 phrases such as grey system, grey number and sequence operator etc. in CNKI database. After entering the new century, the number of grey system papers included in CNKI database is increasing rapidly. Since 2008, more than 10 thousands papers have been included per year and more than 15 thousands papers have been included per year since 2014. Grey system method and model are widely used in physics, chemistry, biology and other fields of natural science, as well as transportation, electric power, machinery and other fields of engineering technology, and a large number of valuable results have been achieved.Practical implicationsIt can be seen that the grey system theory plays an important role in promoting China’s scientific and technological progress, innovation and development and high-level talent training from tens of thousands of literatures marked with important national science and technology projects and a large number of grey system literatures published by China’s double first-class universities and double first-class discipline construction universities.Originality/valueBoth innovations of theoretical research and practical application play important role in the growth of new theory. The innovations of theoretical research provide methods and tools for practical application, which is conducive to improve application efficiency and broaden application fields. A large number of practical applications needs have become the source of theoretical innovation and the solid background for the birth of theoretical innovation achievements.

The malaria-infected red blood cells experience a significant decrease in cell deformability and increase in cell membrane adhesion. Blood hemodynamics in microvessels is significantly affected by the alteration of the mechanical property as well as the aggregation of parasitized red blood cells. In this study, we aim to numerically study the connection between cell-level mechanobiological properties of human red blood cells and related malaria disease state by investigating the transport of multiple red blood cell aggregates passing through microchannels with symmetric stenosis. Effects of stenosis magnitude, aggregation strength, and cell deformability on cell rheology and flow characteristics were studied by a two-dimensional model using the fictitious domain-immersed boundary method. The results indicated that the motion and dissociation of red blood cell aggregates were influenced by these factors and the flow resistance increases with the increase of aggregating strength and cell stiffness. Further, the roughness of the velocity profile was enhanced by cell aggregation, which considerably affected the blood flow characteristics. The study may assist us in understanding cellular-level mechanisms in disease development.

Purpose -Since the present university leading cadre capability evaluations are mainly static, there is a lack of evaluation methods to address dynamic and multi-scale-based situations. Some important factors to address people's performances, such as the developing trends and potentialities are considered. The purpose of this paper is to attempt to propose a dynamic evaluation model based on multivariate delay connection number. Design/methodology/approach -First, evaluation results of previous periods are taken into the current period and values of uncertain numbers are revised. Next, a dynamic evaluation model is built for university leading cadre. Last, a numerical example is used to prove its feasibility and effectiveness. Findings -This paper promotes a corrected equal portion value method of uncertain numbers i1(t), . . . ,in(t) from the adjacent two periods to multi periods, and builds a dynamic evaluation model, which proved simple-structured and easy to apply. Practical implications -The new model is applied in the evaluation of university leading cadre, and could give a more comprehensive, dynamic, scientific analysis for evaluation by model application.Originality/value -The paper develops a novel evaluation model based on a multivariate delay connection number, which expands traditional methods from a static situation to a dynamic and multi-scale-based situation.

The Seligi field is the largest oil field in Peninsular Malaysia.Its largest reservoir, the J-18/60 which contains about 47 percent of the field's total original oil-in-place, has a relatively thin oil column (19 to 36 meters) overlain by multiple large gas caps and underlain by an active aquifer system. The sandstone thickness and reservoir quality vary across the field. Three other major oil-bearing reservoirs also have thin oil columns and gas caps. The J-18/60 is being produced via a combination of gas cap expansion and waterdrive mechanisms. Optimum recovery will depend upon proper balancing of crude withdrawals and gas injection.The production strategy is also complicated by the fact that the aqUifer underlying the major J-18/60 reservoir is common to other fields which have been on production for several years. This paper discusses: 1) the reservoir development planning of Seligi. which involved the development of a very large computer simulation model to assist in addressing the numerous complex factors that influence oil recovery and hence development decisions, 2) evaluation of horizontal wells to optimize recovery from the thin oil column and experience in drilling the first horizontal well in the field, and 3) challenges in facilities planning for development of the field.

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Aiming at more and more prominent climate problems including urban heat island and haze pollution, many cities develop studies on and compile urban ventilation corridor planning. As an emerging planning project,this paper explores to develop the urban ventilation system and the leading control factors oriented with practicability of urban ventilation corridor planning based on the establishment of Zhangzhou in China ventilation corridor planning, puts forward to corresponding control measures and develops the planning system and planning method of urban ventilation corridor.

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In stock market, game behaviors of investors seeking immediate price-margin could be described by model of matrix game. However, due to such factors as limitation of human knowledge, incompletion of iiformation and structural and random fluctuation of system, it's impossible for matrix of firture yield lo be completely accurate. Applying grey theory, the thesis takes a new approach to analyze deeply and study decisionmaking in the field of grey matrix for immediafe pricemargin for stock investors based upon grey information. Firstly,we define concepts such as preceded grey payoff matrix by players concemed and the set of strategies. Based on this, the thesis gives proof of the suficient condition in one-side conservation solution, the general solutions. and optional solution, in case of grey pure strategy. The constructive proves have provided stock speculator with the solution in the grey mairix game for immediate price-margin.