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This paper reviewed the physicochemical properties of sediments and their major watersheds in the Beijing-Tianjin・Hebei region, discussed the distribution characteristics of heavy metals (Cu, Pb, Zn, Cd, Cr) in the sediment in the region systematically, analyzed the relationship between the physicochemical properties of the rivers and the concentrations of heavy metals using correlation analysis, and evaluated the potential ecological risk of heavy metals in the sediments of the water bodies in the region using the potential ecological hazard index method, the potential ecological risk of heavy metals in water sediments in this area was evaluated using the potential ecological risk index method・ The results showed that the physicochemical characteristics of the rivers in the study area were generally consistent w让h their background values; the evaluation of heavy metal concentrations were ranked as Zn > Cr > Cu > Pb > Cd; there is a correlation between pH and total N, total P and organic matter, and strong correlation between elemental Pb and Cd, elemental Zn and Cr;the potential ecological hazard levels of elemental Cd cover four levels; low, medium, heavy and serious, and most of the remaining samples are at the level of low harm to the ecological environment. [ABSTRACT FROM AUTHOR]

With the deepening of medical reform process in China, the continuous improvement of medical and health policies and systems, a large number of innovative drugs have been put on the market quickly, which not only better meet the needs of clinical diagnosis and treatment and guarantee the use of drugs, but put forward higher requirements and great challenges to the limited pharmaceutical management resources of medical institutions. The research and use of scientific, standardized, objective, simple and feasible methods and tools for drug selection and evaluation can provide scientific basis for medical institutions to adjust drug list reasonably. This paper reviews the current status of methods and tools for drug selection and evaluation in medical institutions in China by searching relevant research literature, exploring and analyzing the research process and technical characteristics, so as to provide reference for medical institutions to select appropriate methods and tools for drug selection and evaluation. [ABSTRACT FROM AUTHOR]

Adolescents’ self-control ability is closely related to their development in all aspects, which is highly concerned by researchers in the field of self-control. A total of 1587 articles published from 2010 to 2020 were obtained from the Web of Science database. Using the keywords co-occurrence function of VOS viewer（1.6.13), this paper summarizes the main contents and trends of adolescents’ self-control researches in the past 10 years, the evaluation methods, and the achievements of intervention researches. In the future, researchers can further explore the positive risk-taking to promote adolescents’ physical and mental health and select appropriate evaluation methods to improve the credibility of research results. [ABSTRACT FROM AUTHOR]

To objectively reflect the technical advancement of the new generation smart substation, this paper proposed the method based on quality function deployment (QFD) theory. It is a method that systematically studies the relation between engineering requirements and the key technology, and investigates the key technology in the practical application of substation. By structuring the transformation matrix, the quality house based on the theory of quality function deployment (QFD) was formulated. According to the framework, using the grey correlation analysis method, it made relevant calculation so as to obtain the result of substation's technical advanced evaluation. At the same time, the analysis of examples prove the reliability and the advancement of the method. [ABSTRACT FROM AUTHOR]

Ontology is an important tool for knowledge sharing, and it is also the piilars of the semantic Web. The use of ontology is carried out in the premise of ensuring its quality. Ontology evaluation provides technical support for the quality of the ontology construction and reuse. Firstly, this paper analyzed the necessity of the ontology evaluation, and then, it surveyed the state of the art of ontology evaluation, including the evaluation methods are summarized, reviewed the metrics system of ontology evaluation and analyzed and compared the evaluation tools. Finally, it highlighted the open research issues and future research directions. [ABSTRACT FROM AUTHOR]

The evaluations of the public transit service performance researches have received more and more attentions from researchers at home and abroad. This paper took the research achievements as the review object. It reviewed and commented systematically for the evaluation criteria, evaluation methods and evaluation indicators of public transit service performance. And it reviewed the development and main results of the current research, discussed the limitations of the existing research and finally put forward some further research ideas. [ABSTRACT FROM AUTHOR]