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Articles by Wang Jun
Total Records ( 8 ) for Wang Jun
  Yang Hanlin and Wang Jun
  Automatic detection of circuit boards defect based on the image processing techniques, is affected by the too large size of the circuit boards image and unclear characteristic factors and its detection speed and detection accuracy always needs to be improved. To this end, an automatic detection method of circuit boards defect based on partition enhanced matching was proposed in this study. First, the image of standard board and pending board was divided into some sub-blocks. Second, a piecewise linear transformation method was used in enhancing the characteristics of the image of each sub-block. Finally, gray scale statistical matching method was used to determine whether the sub-lock image is defective. Experimental results show that this detection method can obtain a fast speed and a good accuracy.
  Wang Haixia , Zhao Qing and Wang Jun
  Food security and grain store energy consumption get much more important worldwide step by step. Construction and transformation of low-temperature granary is gradually increacing in our country. In the cold source scheme selection, technology about shallow geothermal energy attracts the attention of many engineers and technicians for its energy saving and environmental protection. This article introduces the application of geothermal energy in the construction of a low temperature granary in Southwest China in the design and economic aspects.
  Wang Jun , Deng Chang-Yan , Xiong Yuan-Zhu and Zuo Bo
  Hexokinase II (HK2) has been demonstrated to play as a key enzyme member in the glycolysis reaction. It catalyzes the conversion glucose to glucose-6-phosphate thus committing glucose to the glycolytic pathway. The objective of this study was to investigate the polymorphism in candidate gene HK2 affectting on meat quality and carcass traits in pigs. The polymorphism (G981A) in intron 10 of porcine HK2 gene which resulting in the changes of restriction site for enzyme Msp I was genotyped in the population of 309 F2 pigs of two Large White x Meishan reference family, result of statistical analysis of variance showed that significant difference between AA and BB was found in meat mar,bling (m. Biceps Femoris, BF) traits. This locus is significantly additive in action; there are significant associations of the detected locus between AA and BB were found with loin eye height, average skin thickness and significantly additive in action.
  Wang Jun and Wang Shitong
  A novel image thresholding method based on weighted Parzen-window estimation is proposed in this paper. A hierarchical clustering procedure is first performed to obtain the reference pixels and weights before the weighted Parzen-window procedure is used to estimate the corresponding probabilities. The error produced during reference pixels` generation is controlled by the upper bound error. Using the proposed criterion function, the optimal threshold is computed. Compared with the image thresholding method based on Parzen-window estimation. The experimental results here show that the proposed method can effectively reduce the computational burden and storage requirements without degrading final segmentation results a lot.
  Wang Jun and Shi Jihui
  As a measure of production factor, capital (K), Capital stock is a key parameter in macroeconomic analysis and policy studies. However, how to account capital stock is a great dispute for the lack of essential data in China. A new method to evaluate the capital stock with optimized depreciation rate is proposed in this paper which makes the sum squared residual minimized between calculated value and authoritative depreciation data from Input-Output (IO) tables, with the capital stock of base year unknown. Formula of the optimized depreciation rate and the base year capital stock can be derived from rigid theory reasoning of the optimization problem to evaluate the capital stock of any year.
  Wang Haixia , Wang Jun and Sun Kunfeng
  This research employs numerical methods to simulate three-dimensional numerical flow field of large-scale low-temperature cold store. With help of analysis on different cooler layouts, the research shows that Staggered layout for coolers shall be adopted, under which the air flow has low velocity and even distribution in most of the space. The research method of numerical simulation is simple and convenient in comparison with experimental method which could provide conductive advice to optimization of the design of large space low-temperature cold storage.
  Wang Jun , Liu Wen-Zhao , Mu Han-Feng and Dang Ting-Hui
  A long-term (21-year) field experiment was performed to study the responses of soil inorganic P fractions and P availability to annual fertilizer P application in a calcareous soil on the Loess Plateau of China. Soil Olsen-P contents increased by 3.7, 5.2, 11.2 and 20.6 mg P kg-1 after 21-year annual fertilizer P application at 20, 39, 59, and 79 kg P ha-1, respectively. Long-term fertilizer P addition also increased soil total P and inorganic P (Pi) contents significantly. The contents of inorganic P fractions were in the order of Ca10 -P > Ca8-P > Fe-P > Al-P > occluded P > Ca2-P in the soil receiving annual fertilizer P application. Fertilizer P application increased Ca8-P, Al-P and Ca2-P contents as well as their percentages relative to Pi. Pi application increased Fe-P and occluded P contents but nor their percentages. Soil Ca10-P content remained unchanged after fertilizer P application while its percentage relative to Pi declined with increasing fertilizer P rate. All Pi fractions but Ca10 -P were correlated with Olsen-P significantly. 90% of variations in Olsen-P could be explained by Pi fractions, and the direct contribution of Ca8 -P was predominant. Long-term annual superphosphate application would facilitate the accumulation of soil Ca8-P, and thus improve soil P availability.
  ZHANG Jin-Ping , SHEN Cheng-De , REN Hai , WANG Jun and HAN Wei-Dong
  Based on total carbon (C) and C isotopes in sediment cores, sedimentary organic carbon (SOC) was quantified in three types of mangrove sites (barren flat sites without mangroves, mangrove plantations, and natural mangrove forests), which were considered to represent a continuum from least restored to most restored sites in southern China. SOC densities in the barren sites, plantations, and natural forests were 90, 170 and 288 Mg ha−1, respectively. We inferred that mangrove restoration increased SOC accumulation in coastal areas. At 0–70 cm depth, SOC δ13C values in both mangrove sites ranged from −27.37‰ to −23.07‰ and exhibited gradual enrichment with depth. In contrast, the values in the barren flat sites remained around −22.19‰ and fluctuated slightly with depth. At 0–60 cm, the 14C ages of the SOC in the barren flat site, the natural mangrove site, and the artificial mangrove site ranged from 1 397 to 2 608, 255 to 2 453, and 391 to 2 512 years BP, respectively. In both types of mangrove sites but not in the barren flat sites, the enrichment of δ13C with depth was related to increases in SOC decay and SOC age with depth. According to analysis of 14C age, much of the mangrove-derived C was transported and stored at 0–60 cm depth under anaerobic conditions in both mangrove sites. The sediments of mangrove forests in southern China sequester large quantities of SOC during mangrove restoration.
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