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Articles by Zhang Yuan
Total Records ( 5 ) for Zhang Yuan
  Zhang Gefu and Zhang Yuan
  In china, home-school Communication system used in the current market is of low efficiency and other campus digital solutions for the promotion of home-school communication achieved little too, because the traditional infusion teaching model is widely applied on classes. Thus a Home-School Full Communication System based on students’ curriculum learning state is proposed to solve these problems. This system takes technology strategies and management strategies into account. The management strategies, including learning status tracking, evaluation of the growth index and statement sets and its pattern, make students’ learning state tracking digitized, calculated and counted, which helps to interpret the growth characteristics from different sides. The technology strategies focus upon the implementation of light information systems for mobile intelligent terminal operation. There is an instance about Home-School Full Communication System to explain the effect the system achieves. The example has also shown that the solution is feasible, which can provide an effective tool for these classes of Chinese new curriculum reform.
  Zhang Jun , Wei Wei and Zhang Yuan
  Longitudinal dynamic analysis for 20-groupage, 18t-axle-load high-speed wagons under the operation of service braking and emergency braking were investigated using longitudinal dynamics analysis system, which was based on air brake system emulation. According to the simulation results, the longitudinal impulsion was differentiated into two parts, which were “extrusion coupler force” and “impact coupler force”. Some advises were also put forward to reduce the longitudinal impulsion.
  Zhang Gefu and Zhang Yuan
  Proposed in this paper, a kind of students’ learning state tracking and evaluation model, centered on teaching activities, was based on recording students’ behavior state in every activity space, during every teaching procedure. Firstly, a growth evaluation index system has been constructed based on fuzzy AHP. Five items indexes and one growth index could be computed out after completing count, weighted sum and normalization. Those five items are virtue, ability, diligence, achievements and participation. Every item has five second index for assessment. This evaluation system is consistent with Chinese modern education goals. A detailed calculation arithmetical model of each index has been given which can interpret precisely the meaning of those indexes. Then, a computer model has been constructed for picking up and measuring information of students. A computer system of students’ growth dynamic evaluation has been introduced. At last, a practical example was taken to show that this model is feasible for evaluating students’ growth in our classes last 3 years.
  Xiao Wei , Ding Xiangdong , Wang Chuduan , Wang Yachun and Zhang Yuan
  Connectedness between herds plays a very important role in cross-herd genetic evaluation in pig breeding. The connectedness between herds in Beijing region was evaluated to assess the efficiency of regional joint breeding system in China. In current study, data on age at 100 kg in Large White and Landrace were collected and Connectedness Rating (CR) method was employed to measure the connectedness between herds. Results showed that most herds have genetic connection with other herds. There were 17 and 10 herds, out of totally 19 and 13 herds of Large White and Landrace, respectively were connected with at least one other herd within breed. However, the average CR in Beijing was relatively low (0-4.80%), the strong connectedness only existed among few herds; therefore, regional cross-herd genetic evaluation by far is not practicable. More intense efforts are needed to establish and enhance the connectedness between herds by means of extensive use of Artificial Insemination (AI), together with promotion of other activities on breed registration, performance test, etc.
  YANG Dan , QI Shi-Hua , ZHANG Jia-Quan , TAN Ling-Zhi , ZHANG Jun-Peng , ZHANG Yuan , XU Feng , XING Xin-Li , HU Ying , CHEN Wei , YANG Jun-Hua and XU Mei-Hui
  A soil survey was conducted in Zhangzhou City, an important agricultural region in south of the Fujian Province, China. 93 surface soil samples were collected in the paddy fields, vegetable lands, orchards and tea plantations from Zhangzhou City. An additional soil profile was sampled in a paddy field as previous research had indicated high concentrations of organochlorine pesticides (OCPs) in the paddy fields. Dichlorodiphenyltrichloroethanes (DDTs) ranged from 0.64–78.07 ng g−1 dry weight and hexachlorocyclohexanes (HCHs) ranged from 0.72–30.16 ng g−1 dry weight in the surface soil of the whole study region. Ratios of α-HCH/γ-HCH < 4 and o, p′-DDT/p, p′-DDT > 1 in all soil samples suggested that lindane and dicofol were widely applied in this region in the past. Concentrations of HCHs and DDTs in soils from the four land use types followed the orders: paddy fields > vegetable lands > tea plantations > orchards and tea plantations > orchards > paddy fields > vegetable lands, respectively. Analyses of the data showed no correlation (r < 0.1) between elevation and OCPs contents in paddy fields, orchards and vegetable lands, indicated no significantly different features in distribution of HCHs and DDTs in the soils from low lying plains and mountains and the unsystematic usage of OCPs, and highlighted the fragmented nature of agricultural production in Zhangzhou, as well as the reemission of OCPs from the soils, where high OCPs concentrations were found, in Longhai of Zhangzhou. In addition, no obvious relationship between the OCPs and total organic carbon (TOC) (r < 0.3) was observed in the soil profile. The mean contribution of dicofol in total DDTs was 66% in the whole Zhangzhou region. The approximate burdens of HCHs and DDTs in the surface layer of 0–20 cm were 0.44 and 1.55 t, respectively. The storage of both HCHs and DDTs in soil surface layer (0–20 cm) accounts for 40% burden of the soil layer of 0–50 cm (1.10 t HCHs and 3.87 t DDTs), in which the highest concentrations of OCPs were observed in soil profile.
 
 
 
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