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Search Results: 1 - 10 of 76142 matches for " Zeng-Xin Wei "
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A nonmonotone adaptive trust-region algorithm for symmetric nonlinear equations  [PDF]
Gong-Lin Yuan, Cui-Ling Chen, Zeng-Xin Wei
Natural Science (NS) , 2010, DOI: 10.4236/ns.2010.24045
Abstract: In this paper, we propose a nonmonotone adap-tive trust-region method for solving symmetric nonlinear equations problems. The convergent result of the presented method will be estab-lished under favorable conditions. Numerical results are reported.
N′-(4-Methoxybenzylidene)-4-methylbenzohydrazide
Zeng-Xin Liu
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811049932
Abstract: The title compound, C16H16N2O2, is the product of the reaction of 4-methoxybenzaldehyde and 4-methylbenzohydrazide. The dihedral angle between the substituted benzene rings is 17.6 (3)° and the methoxy C atom is almost coplanar with its attached ring [deviation = 0.019 (4) ]. In the crystal, molecules are linked by N—H...O hydrogen bonds, forming C(4) chains propagating along the b-axis direction.
N′-(2-Hydroxybenzylidene)-3-methylbenzohydrazide
Zeng-Xin Liu
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811049944
Abstract: The title compound, C15H14N2O2, is the product of the reaction of 2-hydroxybenzaldehyde and 3-methylbenzohydrazide. The dihedral angle between the substituted benzene rings is 19.5 (3)° and an intramolecular O—H...N hydrogen bond generates an S(6) ring motif. In the crystal, molecules are linked by N—H...O hydrogen bonds to generate C(4) chains propagating in [001] and C—H...O interactions to the same O-atom acceptor reinforce the chains.
Percutaneous Endoscopic Lumbar Spine Surgery for Lumbar Disc Herniation and Lumbar Spine Stenosis: Emphasizing on Clinical Outcomes of Transforaminal Technique  [PDF]
Singh Ratish, Zeng-Xin Gao, Hirachan Mangal Prasad, Zhang Pei, Dangol Bijendra
Surgical Science (SS) , 2018, DOI: 10.4236/ss.2018.92007
Abstract: Lumbar Disc Herniation and Lumbar Spine Stenosis are the most common spine diseases which are mainly due to age related Spine degeneration. Diagnosis of both Lumbar Disc Herniation and Lumbar Spine Stenosis depends on clinical findings as well as radiological investigations. Treatment of choice of these conditions is on the basis of the patient conditions. Surgical treatment is the option only when the conservative treatment does not improve the patient’s clinical condition. Advancement and improvement of the technology have resulted in the traditional open surgical treatment into minimal invasive surgery. Intervention of the different surgical instruments with expert spinal surgeons had made percutaneous endoscopic lumbar Spine surgery as one of the preferred choices of surgery for treating Lumbar Disc Herniation and Lumbar Spine Stenosis. The concept of percutaneous endoscopic surgery for lumbar region is to provide surgical options without producing iatrogenic morbidity associated with the open surgical procedures. Conventionally, there are different approaches/techniques for Percutaneous Endoscopic Lumbar Spine Surgery, but in this review we are mainly focusing on the Transforaminal Technique. Regarding the Lumbar Disc Herniation treatment with transforaminal approach, a number of articles have been published due to which we mainly focused on those articles which were published after 2009 onwards. While fewer articles related to Lumbar Spine Stenosis treatment with Transforaminal approach were found, we tried to brief out all those articles. On the basis of comparative study of different surgeries done for Lumbar Disc Herniation and Lumbar Spine Stenosis, Percutaneous Transforaminal endoscopic Lumbar Surgery provides a substantial benefit. Transforaminal approach for treating Lumbar Disc Herniation and Lumbar Spine Stenosis is safe and effective. The Percutaneous Transforaminal Endoscopic Lumbar Surgery has advantage as it is performed under local anesthesia with shorter length of hospitalization and early return to normal life. The clinical outcome of the patient that underwent Percutaneous Transforaminal Endoscopic Lumbar Surgery for Lumbar Disc Herniation and Lumbar Spine Stenosis is quite good in regard of its fewer complication and more benefits.
Tris(ethylenediamine-κ2N,N′)cadmium hexafluoridogermanate
Guo-Ming Wang,Zeng-Xin Li,Pei Wang
Acta Crystallographica Section E , 2012, DOI: 10.1107/s160053681200983x
Abstract: In the title compound, [Cd(C2H8N2)3](GeF6), the CdII atom, lying on a 32 symmetry site, is coordinated by six N atoms from three ethylenediamine (en) ligands in a distorted octahedral geometry. The Ge atom also lies on a 32 symmetry site and is coordinated by six F atoms. The en ligand has a twofold rotation axis passing through the mid-point of the C—C bond. The F atom is disordered over two sites with equal occupancy factors. In the crystal, the [Cd(en)3]2+ cations and [GeF6]2 anions are connected through N—H...F hydrogen bonds, forming a three-dimensional supramolecular network.
Bis(ethylenediammonium) tetradecaborate
Guo-Ming Wang,Pei Wang,Zeng-Xin Li,Hui Li
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810008494
Abstract: The title compound, 2C2H10N22+·B14O20(OH)64 , consists of a centrosymmetric tetradecaborate anion and two ethylenediammonium cations. The anions are interconnected through strong O—H...O hydrogen bonds into a three-dimensional supramolecular network with channels along [100], [010], [001] and [111]. The diprotonated cations reside in the channels and interact with the inorganic framework by extensive N—H...O hydrogen bonds.
Poly[tetraaqua-μ3-benzene-1,2-dicarboxylato-μ3-bromido-penta-μ2-bromido-octa-μ3-isonicotinato-heptacopper(I)trilanthanum(III)]
Guo-Ming Wang,Zeng-Xin Li,Shu-Yun Xue,Hui-Luan Liu
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809014081
Abstract: A new lanthanum(III)–copper(I) heterometallic coordination polymer, [Cu7La3Br6(C6H4NO2)8(C8H4O4)(H2O)4]n, has been prepared by a hydrothermal method. Of the three La atoms in the asymmetric unit, two are eight-coordinate with bicapped trigonal–prismatic configurations; the third is nine-coordinated and has a tricapped trigonal–prismatic coordination geometry. Of the seven Cu atoms, two are two-coordinate with CuBrN and CuN2 ligand sets, three have trigonal configurations, viz. CuBrN2, CuBr2N and CuBr3, while the remaining two adopt distorted tetrahedral CuBr3N geometries. In the crystal structure, adjacent La centers are linked by isonicotinate (IN ) and benzene-1,2-dicarboxylate ligands to form a two-dimensional La–carboxylate layer in the ab plane. These layers are further interconnected with each other by bridging [Cu(IN)2] motifs, leading to an unusual three-dimensional heterometallic Cu–halide–lanthanide–organic framework, with the inorganic [Cu6Br6]n chains located in the resulting channels. Two Cu atoms are disordered over two positions, both with site occupancy factors of 0.80 and 0.20. O—H...O hydrogen bonding between water molecules and carboxylate O atoms helps to consolidate the crystal packing.
Poly[tetraaqua-μ4-bromido-di-μ2-bromido-μ2-hydroxido-di-μ3-isonicotinato-tetra-μ2-isonicotinato-tetracopper(I)dithulium(III)]
Guo-Ming Wang,Zeng-Xin Li,Qing-Hua Zheng,Hui-Luan Liu
Acta Crystallographica Section E , 2008, DOI: 10.1107/s1600536808028675
Abstract: A new thulium(III)–copper(I) heterometallic coordination polymer, [Cu4Tm2Br3(C6H4NO2)6(OH)(H2O)4]n, has been prepared by a hydrothermal method. The Tm and both Cu atoms lie on mirror planes. The Tm atom is seven-coordinate with a capped distorted trigonal–prismatic coordination geometry, while the Cu atoms adopt trigonal CuBrN2 and tetrahedral CuBr3N coordination modes, respectively. The Cu atom in the trigonal coordination environment is disordered over two sites of equal occupancy. The crystal structure is constructed from two distinct units of dimeric [Tm2(μ2-OH(IN)6(H2O)4] cores (IN = isonicotinate) and one-dimensional inorganic [Cu4Br3]n chains, which are linked together, forming heterometallic Cu–halide–lanthanide–organic layers.
Influence of reaction gas flows on the properties of SiGe:H thin film prepared by plasma assisted reactive thermal chemical vapour deposition

Zhang Li-Ping,Zhang Jian-Jun,Shang Ze-Ren,Hu Zeng-Xin,Geng Xin-Hua,Zhao Ying,

中国物理 B , 2008,
Abstract: A new preparing technology, very high frequency plasma assisted reactive thermal chemical vapour deposition (VHFPA-RTCVD), is introduced to prepare SiGe:H thin films on substrate kept at a lower temperature. In the previous work, reactive thermal chemical vapour deposition (RTCVD) technology was successfully used to prepare SiGe:H thin films, but the temperature of the substrate needed to exceed 400\du. In this work, very high frequency plasma method is used to assist RTCVD technology in reducing the temperature of substrate by largely enhancing the temperature of reacting gases on the surface of the substrate. The growth rate, structural properties, surface morphology, photo-conductivity and dark-conductivity of SiGe:H thin films prepared by this new technology are investigated for films with different germanium concentrations, and the experimental results are discussed.
Effect of releasing cotton seedling by turn-over plastic film on micro-ecological system in plastic-mulched cotton field
地膜棉翻膜放苗的棉田微生态效应

XIA Zhi-Ming,WANG Zeng-Xin,JIA Tao,LIU Sheng-Rong,
夏志明
,王增信,贾涛,刘生荣

中国生态农业学报 , 2008,
Abstract: 对地膜棉翻膜放苗的棉田微生态效应研究表明,翻膜放苗地膜的有效覆盖度比打孔放苗增加30%~45%,增强了对棉田水温变化的影响,翻膜放苗可明显提高大行地温,且对提高和稳定小行地温也有良好的效应。放苗初期,小行土壤含水量略低于对照,有利于解决地膜棉易出现高脚苗旺长问题。翻膜放苗后加剧了土壤空隙中水汽的膨缩运动,大行土壤容重平均比对照降低0.12g·cm-3,土壤疏松,水、气、热较为协调,耕层土壤微环境得到改善,为增强根系活力和扩大吸收范围创造了条件。有效覆盖度的增加增强了覆盖的反光效应,有利于提高近地层光照强度和棉株制造光合产物的能力,并增大了苗期对蚜虫迁入的拒避作用。
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