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Search Results: 1 - 10 of 106975 matches for " CHEN Bao-Dong "
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Numerical simulation and performance test of metal hydride hydrogen storage system
Tzu-Hsiang Yen, Bin-Hao Chen, Bao-Dong Chen
International Journal of Energy and Environment , 2011,
Abstract: Metal hydride reactors are widely used in many industrial applications, such as hydrogen storage, thermal compression, heat pump, etc. According to the research requirement of metal hydride hydrogen storage, the thermal analyses have been implemented in the paper. The metal hydride reaction beds are considered as coupled cylindrical tube modules which combine the chemical absorption and desorption in metal hydride. The model is then used metal hydride LaNi5 as an example to predict the performance of metal hydride hydrogen storage devices, such as the position of hydration front and the thermal flux. Under the different boundary condition the characteristics of heat transfer and mass transfer in metal hydride have influence on the hydrogen absorption and desorption. The researches revealed that the scroll design can improve the temperature distribution in the reactor and the porous tube for directing hydrogen can increase the penetration depth of hydride reaction to decrease the hydrogen absorption time.
Arbuscular mycorrhizal fungi improving drought tolerance of maize plants by up-regulation of aquaporin gene expressions in roots and the fungi themselves

LI Tao,CHEN Bao-Dong,

植物生态学报 , 2012,
Abstract: Aims It has been well demonstrated that arbuscular mycorrhizal (AM) fungi can improve water balance and drought tolerance of host plants under drought stress. However, controversy still exists in mechanisms underlying the mycorrhizal functions. For example, in different experiments AM fungi could up- or down-regulate plant aquaporin gene expression. Furthermore, little information is available on the expression of aquaporin genes in AM fungi under drought stress and its contribution to plant drought tolerance. We investigated the effects of an AM fungus, Glomus intraradices, on expression of a plasma membrane intrinsic protein (PIP) gene family containing 13 PIP genes in maize roots and one aquaporin gene from the AM fungus under simulated drought conditions. Our objectives were to systematically investigate the aquaporin gene expression in the mycorrhizal association in response to drought stress and to help understand the molecular basis for drought tolerance of AM symbiosis. Methods Maize plants inoculated with/without AM fungus G. intraradices were grown under different water regimes in a controlled-environment climate chamber for 42 days. At harvest, the leaf water potential (Ψ) was determined with an SKPM 1400 pressure chamber, and then shoots and roots were collected and carefully cleaned with tap water. Three grams of mixed roots were used to estimate the percentage root colonization after clearing with 10% KOH and staining with 0.05% (v/v) trypan blue in lactic acid. One gram of mixed roots was used to extract total RNA by using TRIZOL to synthesize cDNA. Real-time PCR analysis was performed to estimate the expression of Zm PIP genes and GintAQP1. Shoots and the rest of roots were dried at 105 °C for 10 min and 80 °C for 48 h to obtain dry weights. About 0.2 g of dried shoots or roots was digested by HNO3 for 12 h. The P concentration was recorded by using microplate reader spectra at the wavelength of 820 nm. Experimental data were subjected to statistical analysis using SPSS 13.0. Important findings Under drought stress, inoculation with AM fungus significantly enhanced expression of eight PIP genes except for Zm PIP1;3, Zm PIP1;4 Zm PIP1;5 and Zm PIP2;2 (Zm PIP2;7 expression not detected), and drought stress also enhanced expression of GintAQP1 cloned from hyphae of G. intraradices. Enhanced aquaporin gene expression was beneficial to improvement of plant water status and increase of leaf water potential.
Experiment Research for the Influence of Polarization Direction of Low-power Near-infrared Light on the Light-induced Refractive Index Change

CHEN Bao-dong,WEN Jing,

光子学报 , 2010,
Abstract: The influence of the polarization direction of light-induced refractive index change(Δn) induced by light irradiation in In:Fe:LiNbO3 crystals were investigated by using ordinary and extraordinary recording polarization(opol/epol) laser beams of low-power near infrared light.The experimental results show that the curves are similar of the refractive index distribution,but they have opposite signs,and a further difference is that the saturation refractive index change is clearly larger for ordinary recording polarization,changing to extraordinary recording polarization result only about one-third.The refractive index change in photorefractive crystals induced by two polarization directions of near infrared light is differ from visible light.The crystal illuminated with extraordinary polarized light in the middle of the irradiation region,one can see a strong increased of the refractive index.Moreover,the results can be very useful for fabrication of tailored nonlinear optical device with different refractive index distributions by changing different the polarization directions of near infrared beam.
Potential Role of Arbuscular Mycorrhiza in Bioremediation of Uranium Contaminated Environments

CHEN Bao-dong,CHEN Mei-mei,BAI Ren,

环境科学 , 2011,
Abstract: With the increasing demand for new energy,nuclear industry has been developing very fast,and uranium(U) pollution becomes a serious environmental problem especially in the mining area.The discharge of U products and wastes can contaminate soil and water,and finally threaten human health.On the other side,as an environment-friendly biotechnology,the importance of mycorrhizal technology in remediation of polluted environments has received much attention in recent years.Following a brief introduction of the en...
Electronic Structures of REBaCuO Systems and Its Relation withSuperconductivities

CHEN Ning,ZHANG Bao-Dong,QING Jia,MA Li,LI Fu-Xing,

无机材料学报 , 2002,
Abstract: 利用量子化学的SCF-Xα-SW方法计算了REBaCuO(RE=Y,La,Nd,Sm,Eu,Gd,Dy,Er,和Tm)等氧化物超导体体系的电子结构,计算结果表明,氧化物超导体中存在一种特殊内层轨道耦合作用,它是由RE的5p电子轨道与O的2s电子轨道的空间交叠引起的,内层轨道耦合的大小由两个饱和和轨道的空间交叠程度,以及两个轨道能级的接近程度决定,此外,与实验结果对比可以看出,超导临界温度与两个饱和轨道的交叠程度有相似的变化规律,超导临界流密度与参与耦合的电子数量随RE原子序数的变化规律类似,因此,内层轨道耦合对高温超导电性的影响是不可忽略的。

CHEN Bao-dong,LI Xiao-Lin,ZHU Yong-Guan,

菌物学报 , 2005,
Abstract: Using fungal biomass recovered from compartmented glass bead cultivation system, Zn, Cd and Mn binding capacity of arbuscular mycorrhizal fungi were characterized in pH buffering solutions. Results indicated that fungal mycelium have significantly different binding capacity for different metals, the strongest is for Cd, followed by Zn, and the least for Mn. Under the current experimental conditions, the fungi could adsorb Mn, Zn and Cd up to 1.6%, 2.8% and 13.3% dry biomass respectively. However, most of the adsorbed Cd2+ could be exchanged by Ca2+. In addition, comparison on Cd adsorption by non-mycorrhizal and mycorrhizal roots demonstrated that mycorrhizal colonization changed adsorption characteristics of plant roots. Compared with non-mycorrhizal roots, mycorrhizal roots have higher CEC and stronger Cd binding capacity. Results from this study provided direct evidences for enhanced metal binding capacity of plant roots colonized by arbuscular mycorrhizal fungi.
Numerical investigation into premixed hydrogen combustion within two-stage porous media burner of 1 kW solid oxide fuel cell system
Tzu-Hsiang Yen, Wen-Tang Hong, Yu-Ching Tsai, Hung-Yu Wang, Cheng-Nan Huang, Chien-Hsiung Lee, Bao-Dong Chen
International Journal of Energy and Environment , 2010,
Abstract: Numerical simulations are performed to analyze the combustion of the anode off-gas / cathode off-gas mixture within the two-stage porous media burner of a 1 kW solid oxide fuel cell (SOFC) system. In performing the simulations, the anode gas is assumed to be hydrogen and the combustion of the gas mixture is modeled using a turbulent flow model. The validity of the numerical model is confirmed by comparing the simulation results for the flame barrier temperature and the porous media temperature with the corresponding experimental results. Simulations are then performed to investigate the effects of the hydrogen content and the burner geometry on the temperature distribution within the burner and the corresponding operational range. It is shown that the maximum flame temperature increases with an increasing hydrogen content. In addition, it is found that the burner has an operational range of 1.2~6.5 kW when assigned its default geometry settings (i.e. a length and diameter of 0.17 m and 0.06 m, respectively), but increases to 2~9 kW and 2.6~11.5 kW when the length and diameter are increased by a factor of 1.5, respectively. Finally, the operational range increases to 3.5~16.5 kW when both the diameter and the length of the burner are increased by a factor of 1.5.
Arsenic uptake by arbuscular mycorrhizal maize (Zea mays L.) grown in an arsenic-contaminated soil with added phosphorus
Arsenic uptake by arbuscular mycorrhizal maize (Zea mays L.) grown in an arsenic-contaminated soil with added phosphorus

XIA Yun-sheng,CHEN Bao-dong,CHRISTIE Peter,SMITH F Andrew,WANG You-shan,LI Xiao-lin,
XIA Yun-sheng
,CHEN Bao-dong,CHRISTIE Peter,SMITH F Andrew,WANG You-shan,LI Xiao-lin

环境科学学报(英文版) , 2007,
Abstract: The effects of arbuscular mycorrhizal (AM) fungus (Glomus mosseae) and phosphorus (P) addition (100 mg/kg soil) on arsenic (As)uptake by maize plants (Zea mays L.) from an As-contaminated soil were examined in a glasshouse experiment. Non-mycorrhizal and zero-P addition controls were included. Plant biomass and concentrations and uptake of As, P, and other nutrients, AM colonization, root lengths, and hyphal length densities were determined. The results indicated that addition of P significantly inhibited root colonization and development of extraradical mycelium. Root length and dry weight both increased markedly with mycorrhizal colonization under the zero-P treatments, but shoot and root biomass of AM plants was depressed by P application. AM fungal inoculation decreased shoot As concentrations when no P was added, and shoot and root As concentrations of AM plants increased 2.6 and 1.4 times with P addition, respectively. Shoot and root uptake of P, Mn, Cu, and Zn increased, but shoot Fe uptake decreased by 44.6%, with inoculation,when P was added. P addition reduced shoot P, Fe, Mn, Cu, and Zn uptake of AM plants, but increased root Fe and Mn uptake of the nonmycorrhizal ones. AM colonization therefore appeared to enhance plant tolerance to As in low P soil, and have some potential for the phytostabilization of As-contaminated soil, however, P application may introduce additional environmental risk by increasing soil As mobility.
Effects of Glomus mosseae on the toxicity of heavy metals to Vicia faba
ZHANG Xu-hong,LIN Ai-jun,CHEN Bao-dong,WANG You-shan,SMITH Sally E,SMITH F Andrew,
ZHANG Xu-hong
,LIN Ai-jun,CHEN Bao-dong,WANG You-shan,SMITH Sally E,SMITH F Andrew

环境科学学报(英文版) , 2006,
Abstract: A glasshouse pot experiment was conducted to investigate effects of th e arbuscular mycorrhizal fungus Glomus mosseae on the growth of Vicia faba and t oxicity induced by heavy metals (HMs) (Cu, Zn, Pb and Cd) in a field soil contam inated by a mixture of these metals. There was also uninoculation treatment (NM) simultaneously. Mycorrhizal (GM) plants have significantly increased growth and tolerance to toxicity induced by heavy metals compared with NM plants. P uptake was significantly increased in GM plants. Mycorrhizal symbiosis reduced the tra nsportation of HMs from root to shoot by immobilizing HMs in the mycorrhizal, sh own by increasing the ratios of HMs from root to shoot. Oxidative stress, which can induce DNA damage, is an important mechanism of heavy metal toxicity. GM tre atment decreased oxidative stress by intricating antioxidative systems such as p eroxidases and non-enzymic systems including soluble protein. The DNA damage ind uced by heavy metals was detected using comet assay, which showed DNA damage in the plants was decreased by the GM treatment.

CHEN Bao-Dong,YANG Li-Sen,WEN Jing,WU Rui-Xiang,ZHANG Bao-Guang,CUI Jun-Jie,

红外与毫米波学报 , 2008,
Abstract: 掺铟铁铌酸锂(In:Fe:LiNbO3)晶体在红外弱光辐照下正常折射率变化量△n可以达到10-4数量级.探讨了光生载流子在漂移、扩散和光生伏打效应三种机制下输运迁移以及空间电荷场的形成过程.研究结果表明,光致折射率变化的机制主要是由光生伏打效应引起,并观察到在正常偏振光辐照下,红外弱光与可见光引起晶体的正常折射率变化分布明显不同.
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