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Search Results: 1 - 10 of 153689 matches for " WANG Xing-jun "
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Biodegradation of acetanilide herbicides acetochlor and butachlor in soil
YE Chang-ming,WANG Xing-jun,ZHENG He-hui,
YE Chang-ming,WANG Xing-jun,ZHENG He-hui
环境科学学报(英文版) , 2002,
Abstract: The biodegradation of two acetanilide herbicides, acetochlor and butachlor in soil after other environmental organic matters addition were measured during 35 days laboratory incubations. The herbicides were applied to soil alone, soil SDBS (sodium dodecylbenzene sulfonate) mixtures and soil HA (humic acid) mixtures. Herbicide biodegradation kinetics were compared in the different treatment. Biodegradation products of herbicides in soil alone samples were identified by GC/MS at the end of incubation. Addition of SDBS and HA to soil decreased acetochlor biodegradation, but increased butachlor biodegradation. The biodegradation half life of acetochlor and butachlor in soil alone, soil SDBS mixtures and soil HA mixtures were 4.6d, 6.1d and 5.4d and 5.3d, 4.9d and 5.3d respectively. The biodegradation products were hydroxyacetochlor and 2 methyl 6 ethylaniline for acetochlor, and hydroxybutachlor and 2,6 diethylaniline for butachlor.
Theoretical Analysis of Binary Fe-N Phase Diagrams at Low Temperatures
低温区间的Fe-N二元相图理论分析
LEI Ming-Kai,WANG Xing-Jun,
雷明凯,王兴军
无机材料学报 , 2003,
Abstract: 采用亚点阵的化合物能模型计算低温区间Fe-N二元相图．计算结果表明，25～350℃低温区，分别存在着α-Fe(N)和γ’-Fe4N，γ’-Fe4N和ε-Fe2Nl-x二相平衡．α-Fe(N)，γ’-Fe4N，ε-Fe2Nl-x均为热力学稳定相．依据Guillermet和Du的热力学性质参数计算的低温区间Fe-N二元相图与现有实验数据相符．
Phase transformation and photoluminescence properties of Er silicate films by sol-gel method
Er硅酸盐化合物薄膜的相转变和光致发光特性研究
Wang Xing-Jun,Dong Bin,Zhou Zhi-Ping,
王兴军,董斌,周治平
物理学报 , 2010,
Abstract: 溶胶-凝胶法在Si(100)基片上旋涂法制备铒硅酸盐化合物（Er silicate）薄膜.系统研究了烧结温度和烧结时间对Er silicate薄膜相结构、相转变以及光致发光特性的影响.在1000 ℃以下，薄膜晶体结构为Er2O3 晶体和SiO2 非晶的混合物.随着烧结温度增加到1200 ℃，保温时间增加到30 min，薄膜晶体结构转变成(100),(200)和(300)择优取向的Er2SiO5相.
A REVIEW ON GENE ENGINEERING AND TRANSGENIC EXPRESSION STRATEGY OF ANTIMICROBIAL PEPTIDES
抗菌肽基因工程研究及其表达策略
FENG Xing-jun,WANG Jian-hua,SHAN An-shan,
冯兴军,王建华,单安山
中国生物工程杂志 , 2006,
Abstract: Antimicrobial peptides distribute in a wide variety of organisms and show the multiple biological functions including broad-spectrum antibacterial, immune- modulating and inhibiting tumor activity, as well as exhibiting unique mechanism, which made antibacterial peptides a research focus in the field of gene engineering. It was reviewed on advances of general properties and gene engineering research of antimicrobial peptides. And their transgenic expression strategy and theoretical foundation were also discussed.
Hydrolysis kinetics of atrazine and influence factors
LEI Zhi,|fang,YE Chang,|ming,WANG Xing,|jun,
LEI Zhi-fang,YE Chang-ming,WANG Xing-jun
环境科学学报(英文版) , 2001,
Abstract: The hydrolysis kinetics of atrazine in distilled water and leaching water from soil, and their influence factors were studied by incubation at 35 degrees C and HPLC analysis method. The kinetic process of atrazine hydrolysis can be described by the first-order reaction law. The results showed that the hydrolysis rate constants k in leaching water and distilled water were 1.606 x 10(-3)/d and 1.055 x 10(-3)/d, respectively; the half-life of atrazine hydrolysis in distilled water at pH 3, pH 4.5 and pH 8 were 373 days, 522 days and 657 days respectively. The results also showed that the proton in reaction solution can catalyze the atrazine hydrolysis; humic acid and NH4+ etc. substances in aqueous solution can facilitate atrazine hydrolysis; rate constants of atrazine hydrolysis with humic acid and NH4NO3 were 2.431 x 10(-3)/d and 1.498 x 10(-3)/d respectively which were 2.3 and 1.42 times of control (1.055 x 10(-3)/d); anion NO3- can inhibit catalysis of humic acid to atrazine hydrolysis.
Single crystalline boron carbide nanobelts: synthesis and characterization
Bao Li-Hong,Li Chen,Tian Yuan,Tian Ji-F,Hui Chao,Wang Xing-Jun,Shen Cheng-Min,Gao Hong-Jun,
中国物理 B , 2008,
Abstract: This paper reports that the large-scale single crystalline boron carbide nanobelts have been fabricated through a simple carbothermal reduction method with B/Bcarbothermal reduction, boron carbide, nanobelts, vapour-solidProject supported by the National 863 (Grant No 2007AA03Z305) and 973 (Grant No 2007CB935503) program, the National Science Foundation of China (Grant Nos 60571045, 60620120443, Guo-JI He-Zuo).6146, 9260This paper reports that the large-scale single crystalline boron carbide nanobelts have been fabricated through a simple carbothermal reduction method with B/Bcarbothermal reduction, boron carbide, nanobelts, vapour-solidProject supported by the National 863 (Grant No 2007AA03Z305) and 973 (Grant No 2007CB935503) program, the National Science Foundation of China (Grant Nos 60571045, 60620120443, Guo-JI He-Zuo).6146, 9260This paper reports that the large-scale single crystalline boron carbide nanobelts have been fabricated through a simple carbothermal reduction method with B/Bcarbothermal reduction, boron carbide, nanobelts, vapour-solidProject supported by the National 863 (Grant No 2007AA03Z305) and 973 (Grant No 2007CB935503) program, the National Science Foundation of China (Grant Nos 60571045, 60620120443, Guo-JI He-Zuo).6146, 9260This paper reports that the large-scale single crystalline boron carbide nanobelts have been fabricated through a simple carbothermal reduction method with B/B$_{2}$O$_{3}$/C/Fe powder as precursors at 1100${^\circ}$C. Transmission electron microscopy and selected area electron diffraction characterizations show that the boron carbide nanobelt has a B$_{4}$C rhomb-centred hexagonal structure with good crystallization. Electron energy loss spectroscopy analysis indicates that the nanobelt contains only B and C, and the atomic ratio of B to C is close to 4:1. High resolution transmission electron microscopy results show that the preferential growth direction of the nanobelt is 101]. A possible growth mechanism is also discussed.
Synthesis and photoluminescence property of boron carbide nanowires
Bao Li-Hong,Li Chen,Tian Yuan,Tian Ji-F,Hui Chao,Wang Xing-Jun,Shen Cheng-Min,Gao Hong-Jun,
中国物理 B , 2008,
Abstract: Large scale, high density boron carbide nanowires have been synthesized by using an improved carbothermal reduction method with B/B$_{2}$O$_{3}$/C powder precursors under an argon flow at 1100${^\circ}$C. The boron carbide nanowires are 5--10\,$\mu $m in length and 80--100\,nm in diameter. Transmission electron microscopy (TEM) and selected area electron diffraction (SAED) characterizations show that the boron carbide nanowire has a B$_{4}$C rhombohedral structure with good crystallization. The Raman spectrum of the as-grown boron carbide nanowires is consistent with that of a B$_{4}$C structure consisting of B$_{11}$C icosahedra and C-B-C chains. The room temperature photoluminescence spectrum of the boron carbide nanowires exhibits a visible range of emission centred at 638\,nm.
High-Temperature Phase Transformation of Er3+-doped Boehmite (γ-AlOOH) Gels during Sintering
掺Er3+勃姆石(γ-AlOOH)凝胶高温烧结相变
YANG Tao,WANG Xing-Jun,WANG Hui,LEI Ming-Kai,
杨涛,王兴军,王辉,雷明凯
无机材料学报 , 2004,
Abstract: 采用溶胶-凝胶法(sol—gel)制备掺0-20mol％Er^3 勃姆石(γ-AlOOH)凝胶，X射线衍射和差热分析法研究掺Er^3 ：γ—AlOOH凝胶在950-1400℃烧结的相变过程．结果表明：Er^3 的掺杂降低α相的生长速度，抑制Al2O3的θ→α相变，推迟相变结束温度50-70℃，Er-Al-O系化合物Al10Er6O24和ErAlO3相的析出取决于掺Er^3 浓度和烧结温度．在较高烧结温度下，ErAlO3相由掺1-5mol％Er^3 ：Al2O3中析出；Al10Er6O24相则在掺5-20mol％Er^3 ：Al2O3中析出，随着烧结温度的升高，在全部掺Er^3 ：Al2O3中析出．ErAlO3相促进θ→α相变的形核，α相形核起始温度可提前30-50℃，但对α相生长影响不大．Al10Er6O24相对θ→α相变没有显著影响．
Excitonic Spectra of ZnSe Thin Films Grown on GaAs Substrates
ZnSe薄膜的激子光谱
SHENG Chuan-xiang,WANG Xing-jun,YU Gen-cai,HUANG Da-ming,
盛传祥,王兴军,俞根才,黄大鸣
半导体学报 , 2000,
Abstract: 采用分子束外延 (MBE)技术 ,在 Ga As(1 0 0 )衬底上生长了厚度从 0 .0 4 5到 1 .4μm的 Zn Se薄膜 .X射线衍射谱证实 ,随着薄膜厚度的增加 ,应变逐步弛豫 .测量了低温下样品的反射谱和光致发光谱 ,观察到轻重空穴的能级在不同应变下的分裂、移动和反转 ,以及激子极化激元 (Po-lariton)对反射谱的影响 .也观察到束缚激子发光随着薄膜厚度的变化规律 :束缚在中性受主杂质上的束缚激子发光 (I1峰 )随着薄膜厚度的增加逐渐变弱直至消失 ,而束缚在中性施主杂质上的束缚激子发光 (I2 峰 )则随着厚度增加逐渐增强 .
Process mineralogy characteristics of acid leaching residue produced in low-temperature roasting-acid leaching pretreatment process of refractory gold concentrates
Shuang-hua Zhang,Ya-jie Zheng,Pan Cao,Chao-hui Li,Shen-zhi Lai,Xing-jun Wang
- , 2018, DOI: https://doi.org/10.1007/s12613-018-1664-x
Abstract: To provide a theoretical basis for a suitable process to extract gold from refractory gold concentrates, process mineralogy on the acid leaching residue of gold calcine was studied by chemical composition, X-ray diffraction, scanning electron microscopy-energy spectrum, and mineral dissociation analysis. The results showed that the acid leaching residue contained Au 68.22 g/t, Ag 92.71 g/t, Fe 0.44%, As 0.10%, and S 0.55%. Gold and silver minerals existed as native gold, argentite, and proustite. Quartz, the main gangue mineral, accounted for 78.33wt/%. The dissociation degree analysis showed that the proportions of monomer and exposed gold in acid leaching residue were 96.66wt%. The cyanidation results showed that the cyanide gold leaching rate of acid leaching residues was close to 100wt%. However, the maximum cyanide gold leaching rate of gold calcine was only 85.31wt%. This suggests that acid leaching can increase the gold dissolution rate in the cyanide process.
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