Papers by Author: Rui Jie Wang

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Authors: Rui Jie Wang, Lian Wei Yang
Abstract: Calculating the value of ecosystem services may improve economic efficiency and play an important role in protecting ecosystems.The grassland ecosystem of HulunBuir city is an important component of ecology security system in Northeast China and is the typical belt transect of International Geosphere Biosphere Programme global change study. In this study, net primary productivity (NPP), as an improtant ecological parameter, was used to estmate the services value. Considering the characteristic of satellite imagery, it is difficult to calculate some functions. So we calculated the services value from four aspects, including soil erosion control, water conservation, direct production and gas regulation. The total services value of grassland ecosystem was estimated in RMB to be aproximately 18.47×109Yuan in 2006 (Chinese currency, 7.78 Yuan=US$1), the average economic value of unit area was 15.4×104Yuan/km2. The direct production value was 1.23×109Yuan/year; and the contribution rate to total value was 6.66%. Indirect services value was 17.24×109Yuan/year, and the contribution rate to total value was 93.34%. Indirect services value was far more than direct production value. For the indirect services value, the water regulation value was the maximum, 9.09×109Yuan/year. Gas regulation value was 5.25×109Yuan/year, contributing 28.42% to the total value.
1611
Authors: Lian Wei Yang, Rui Jie Wang, Miao Jia, Guo Sheng Gai
Abstract: Chuanxiong, as a medicinal plant, has been demonstrated useful for the treatment of cardio-cerebrovascular diseases in China. The physicochemical characterization of Chuanxiong particles was greatly influenced by ultrafine pulverization. To study the physicochemical characterization of Chuanxiong, the raw plant material of Chuanxiong was ground to 6 μm particles by HSCS (High Speed Centrifugal Sheering) pulverizer. The micron particles were characterized by optical microscope and SEM. Ferulic acid is one of active ingredients of Chuanxiong, and its extraction yield was determined to evaluate the chemical characterization of Chuanxiong powder. Ferulic acid was analyzed by HPLC (High Performance Liquid Chromatography). The results showed that after ultrafine pulverization, the plant cell walls were broken into pieces and the extraction yield of ferulic acid was increased by 7.739% compared with the normal particles.
1725
Authors: Lian Wei Yang, Rui Jie Wang, Guo Sheng Gai
Abstract: Honghua has been demonstrated useful for promoting blood circulation and stopping pain. The physicochemical characterization of Honghua powders was greatly influenced by ultrafine pulverization. To study the physicochemical characterization of Honghua, the raw plant material of Honghua was ground to powders by high speed centrifugal sheering (HSCS) pulverizer. The micron powders were characterized by laser scattering granulometric analyzer and scanning electron microscope (SEM). Hydroxysafflor yellow A is one of active ingredients of Honghua, and its dissolution speed was determined to evaluate the chemical characterization of Honghua powder. The results showed that after ultrafine pulverization, dissolution speed of hydroxysafflor yellow A was increased by 28.6% compared with the normal powders
55
Authors: Lian Wei Yang, Rui Jie Wang, Miao Jia
Abstract: In view of the problems of current pantograph sliders of electric train,a new pantograph slider is developed for high speed train. The new pantograph slider is consisted of copper,carbon fiber, graphite and etc. The results showed the optimal technique of preparing slider : copper content 78%, carbon fiber content 2%, additive content 5%, pressure 200MPa and sintering temperature 880°C. Its resistance is very low. And its performance of friction,abrasion and impact toughness etc. is improved greatly compared with foreign immersed metal carbon slider Rh82Mb with friction coefficient reduced by 20 %,abrasion ratio decreased by 1.3 %,impact toughness increased by 1.7 times and conductance increased by 65 times.
1736
Authors: Lian Wei Yang, Rui Jie Wang, Yun Dong, Xiao Ping Lin
Abstract: Co/ WC composite powders (with 10 wt% content of Co) were synthesized by direct mechanical grinding in a rotary-vibration mill. The powders with different mill time were evaluated. WC and WC/Co composite coatings were prepared by supersonic plasma spraying. The results showed that the milled powders consist of composite particles that were formed in the first 2h of milling. Longer milling times improve the distribution of phases inside the composite particles. The formation of the composite particles involves sequential steps of deformation, fragmentation, cold welding, work hardening and piercing of particles of the hard phase in the soft phase. X-ray spectra of the sprayed coating are shown that only very weak W2C and Co6W6C peaks are observed. Compared with WC coating, the Co/ WC coating is denser, and less large pores within composite coating.
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Authors: Rui Jie Wang, Lian Wei Yang, Han Dan Zhang, Tie Jun Geng
Abstract: The compound super absorbent resin was synthesized by starch, bentonite, acrylic acid and acrylamide, using microwave irradiation. Some key factors affecting the solution absorbency of the polymer such as the amount of bentonite, acrylamide, initiator and cross-linking agent have been discussed. The results showed that the optimal reaction conditions of cross-linking agent, initiator, neutralization degree, bentonite, phosphate starch are 0.045%, 0.32%, 70%, 10%, 3% when the weight ratio of acrylic acid and acrylamide was 2:1, the microwave power was 800W, the radiation time was 15min. Under the conditions, the pure water absorption rate of super absorbent resin was up to 796g/g. when the weight ratio of acrylic acid and acrylamide was 1:1, the absorption rate of 0.9% NaCl was 95g/g.
708
Authors: Rui Jie Wang, Lian Wei Yang, Miao Jia
Abstract: The grassland ecosystem of HulunBuir city is an important component of ecology security system in Northeast China. In this study, net primary productivity (NPP), as an improtant ecological parameter, was used to estmate the services value. Considering the characteristic of satellite imagery, it is difficult to calculate some functions. So we calculated the services value from 6 aspects, including soil erosion control, water conservation, direct production, gas regulation, nutrient recycling and atmospheric environment purification. The total services value of grassland ecosystem was estimated in RMB to be aproximately 18.47×109Yuan in 2006, the average economic value of unit area was 15.4×104Yuan/km2. The direct production value was 1.23×109Yuan/year; and the contribution rate to total value was 6.66%. The water regulation value was the maximum, 9.09×109Yuan/year. Gas regulation value was 5.25×109Yuan/yea. The purify atmosphere value was minimal.
1742
Authors: Rui Jie Wang, Lian Wei Yang
Abstract: Due to population pressure and over-grazing, ecological degradation of the rangeland in HulunBuir becomes more and more serious in past decades. To balance pasture grazing activities and ecosystem sustainability, monitoring grass productivity of the rangelands and livestock carrying capacity are very necessary. Grassland yield is the basis of developing livestock, net primary production (NPP) is an important parameters in determining carrying capacity. Using MODIS remote sensing data, we estimated the NPP of grassland ecosystem of HulunBuir in 2006. The total NPP of grassland ecosystem in HulunBuir was 2.9×1013 gC/a in 2006, with an average of 261.01gC/m2•a. Then we based on the estimated NPP to calculate the optimal carrying capacity which was 765.41 ten thousands sheep units. The actual carrying capacity was 1838.45 ten thousands sheep units, total overloading was 1073.04 ten thousands sheep units. The serious regions of overloading were Arong Banner with 325.45 ten thousands sheep units, Zlantun City with 270.72 ten thousands sheep units, Molidawadahanr Autonomous Banner with 254.71 ten thousands sheep units. The carrying capacity of Oroqin Autonomous Banner, Genhe City and Erguna City were scarcity, there were great potential to excavate in livestock.
110
Authors: Lian Wei Yang, Jin Hui Li, Rui Jie Wang
Abstract: To improve the wear and mechanical properties, SiC and Si3N4 whiskers reinforced Si3N4 composites were sintered by hot press sintering technique at 1800 and 1900°C for 1 h. The Friction and wear behaviors of Si3N4-SiC whisker reinforced Si3N4 composites have been studied by using a reciprocating sliding apparatus. The results show that Si3N4-SiC whisker can greatly improve the hardness, fracture toughness and wear resistance of Si3N4. Lower sintering temperature can make both the grain dimension and interface area of the whiskers with the matrix decrease, resulting in relatively uneasy fracture of the whiskers. This uneasy fracture of the whiskers is the main reason for improvement in fracture toughness, and thus, the decrease in wear rate compared with those of the samples sintered at higher temperature and Si3N4 material.
1881
Authors: Rui Jie Wang, Lian Wei Yang
Abstract: Net primary productivity (NPP) is an important indicator for vulnerability monitoring in arid ecosystem. Using MODIS remote sensing data and the improved solar energy efficiency, we estimated the NPP of grassland ecosystem of HulunBuir in 2006, and then output from the improved solar energy efficiency model was validated by the field survey data during growing season of 2006. Comparison of estimated NPP and field sampling NPP, the field sampling NPP was greater than estimated NPP, but there was better interdependency between the field sampling NPP and estimated NPP.The total NPP of grassland ecosystem in HulunBuir was 2.9×1013 gC/a in 2006, with an average of 261.01gC/m2•a. The average was the minimum in Xinbaerhuyou Banner, the maximum in Genhe. For the difference grassland types, lowland meadow was the maximum of unit area, the next was alpine meadow, and temperate steppe was the minimum.
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