检索结果-南通市图书馆

International Journal of Minerals,Metallurgy and Materials 2012年第9期19卷 856-862页

作者： Dong Li Fang Lian xin-mei hou Kuo-chih Chou School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China Department of Physical Chemisitry University of Science and Technology Beijing Beijing 100083 China

Lithium-excess manganese layered oxides, which are commonly described in chemical formula 0.5Li2MnO3·0.5LiMn0.5Ni0.5O2, were prepared by low-heating solid state reaction. The reaction mechanisms of synthesizing precursors, the decomposition mechanism, and intermediate materials in calcination were investigated by means of Fourier transform infrared spectroscopy （FT-IR）, X-ray diffraction （XRD）, field emission scanning electron microscopy （FESEM）, thermogravimetric analysis （TGA）, and differential scanning calorimetry （DSC）. The major diffraction patterns of 0.5Li2MnO3·0.5LiMn0.5Ni0.5O2 powder calcinated at 720℃ for 15 h are indexed to the hexagonal structure with a space group of R3m, and the clear splits of doublets at （006）/（102） and （108）/（110） indicate that the sample adopts a well-layered structure. FESEM images show that the size of the agglomerated particles of the sample ranges from 100 to 300 nm.

关键词： lithium batteries electrode manganese oxide solid state reactions calcination

Enhanced room temperature magnetoresistance in maganites La_(0.60)Sr_(0.25-y)Na_(0.15)Δ_yMnO_(31)

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2006年第Z1期25卷 515-520页

作者： TANG Guide zhao Fuwei LI Zhuangzhi hou Denglu zhao Xu LI Zhiqing Department of Physics Hebei Normal University Shijiazhuang 050016 China Department of Physics Hebei Normal University Shijiazhuang 050016 China Department of Physics Hebei Normal University Shijiazhuang 050016 China Department of Physics Hebei Normal University Shijiazhuang 050016 China Department of Physics Hebei Normal University Shijiazhuang 050016 China Department of Applied PhysicsSchool of ScienceTianjin UniversityTianjin 300072China

Bulk polycrystalline samples of La0.60Sr0.4MnO3 and La0.60Sr0.25-yNa0.15ΔyMnO3 with 0.00≤y≤0.15 (“Δ” representing cation vacancy) were successfully synthesized using the sol-gel method. The structural, magnetic, and electrical properties of the polycrystalline of the samples were investigated. The results of X-ray powder diffraction patterns show that these compounds crystallize in a distorted rhombohedral structure with the space group R3C. The measurement shows that, with vacancy content y increasing, the unit cell volume V of samples increases, furthermore, the Curie temperature TC decreases. The temperature dependence of resistivity shows that all samples undergo a metal-semiconductor transition accompanying a ferromagnetic to paramagnetic transition with the increase of temperature. Under an applied filed of 1.8 T, a maximum room temperature magnetoresistance (MR) of 20% is obtained at 293 K for the compound La0.60Sr0.1Na0.15Δ0.15MnO3. The MR peak value of La0.60Sr0.1Na0.15Δ0.15MnO3 increases 2 times more than that of La0.60Sr0.40MnO3 (MRP=6.4%, TMR=373 K), and the MR peak is shifted from 373 K to room temperature.

关键词： perovskite manganite sol-gel method magnetoresistance crystal structure magnetic property

Role of MetallothioneinlH in Cisplatin Resistance of Non-Small Cell Lung Cancer Cells

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Cancer Research 2009年第4期21卷 247-254页

作者： xin-fang hou Qing-xia Fan Liu-xing Wang Shi-xin LU Department of Medicine Henan Tumor Hospital Zhengzhou 450002 China Cancer center of Zhengzhou University Department of Oncology The First Affiliated Hospital Zhengzhou University Zhengzhou 450052 China Department of Etiology and Carcinogenesis Cancer Institute（Hospital） Chinese Academy of Medical Sciences Peking Union Medical College Beijing 100021 China

Objective： Despite platinum-based adjuvant chemotherapy has improved greatly patients＇ outcomes, drug resistance poses a major impediment to the successful use of such an effective agent. Metallothioneins（MTs） are known to play putative roles in cancer cell proliferation, apoptosis, differentiation, drug resistance and prognosis. The present studiy was to investigte the role of metallethioeinlH（MTIH） in cisplatin resistance of human non-small cell lung cancer（NSCLC） cell lines in vitro or its possible molecular mechanisms. Methods： MTIH mRNA expression in A549 and A549/DDP cells was detected by RT-PCR. A recombinant eukaryotic expression plasmid pcDNA3.1（-）-MT1H was constructed and transfected into A549 cells which express no MTIH. MT1H siRNA was transfected into A549/DDP cells which express MTIH highly. MTIH expression was detected by RT-PCR and Immunoblot. The chemosensitivity to cisplatin was assessed by MTT assay. Apoptosis rate was determined by Tunel and FCM. Bcl-2 and Bax were determined by immunohistochemistry. Results： MT1H mRNA was expressed in A549/DDP but not in A549. After transfection of MT1H, MT1H expression was enhanced and the chemosensitivity to cisplatin was decreased in A549 cells. Inversely, after transfection of MT1H siRNA, MT1H expression was decreased and the chemosensitivity to cisplatin was increased in A549/DDP. The apoptosis rate induced by cisplatin was increased and Bcl-2 was down-regulated but Bax showed little change in A549/DDP cells interferred with MT1H siRNA. Conclusion： MT1H overexpression can promote drug resistance in A549 cells . Down-regulation of MTIH interfered with siRNA can effectively reverses the drug resistance in A549/DDP cells by down-regulating the expression of Bcl-2 and increasing cisplatin induced apoptosis. SiRNA targeting MT1H combined with chemotherapy may be a very promising strategy for treatment of lung cancer.

关键词： Metallothionein MT1H Non-small-cell lung cancer Drug resistance Apoptosis

Application of internal fixation of steel-wire limited loop in early Achilles tendon rupture

在线全文

学校读者我要写书评

暂无评论

Asian Pacific Journal of Tropical Medicine 2013年第11期6卷 902-907页

作者： Zhe Chen Jia-Sen Wei zhao-Yang hou Jiong Hu Yan-Guang Cao Qi-xin Chen Department of Orthopaedics The Second Affiliated Hospital of Zhejiang Chinese Medical University Department of Orthopaedics The Second Affiliated Hospital of Zhejiang University School of Medicine

Objective:To explore the clinical effect and safety of internal fixation of steel-wire limited loop in early Achilles tendon ***:Seventy-six patients respectively with early transected and avulsed types of Achilles tendon rupture were selected and treated with internal fixation of steel-wire limited *** patients began to take exercise for their lower limbs through continous passive motion as early as possible after surgical repair,and the loops were removed after 3-5 *** months later,the condition of complications including Achilles tendon re-rupture,wound fistula,wound infection and skin necrosis,cutaneous sensation in sural nerve dominance region,time back to preinjury work or learning as well as time to physical activities were *** year later,the therapeutic effect was evaluated,and the maximum circumferences of bilateral legs and raptured plane circumferences of Achilles tendon were ***:The wound of all patients healed well,no complications like Achilles tendon re-rupture,wound fistula,wound infection and skin necrosis occured,and the cutaneous sensation in sural nerve dominance region was *** mean time back to preinjury work or learning as well as to pysical activities of all patients were respectively 10 and 22 *** out of 76 patients(92.1%) achieved an excellent effect,and 6(7.9%) good *** excellent and good rate came up to 100%.The maximum circumference in the affected leg decreased to 2 mm averagely compared with the offside,while the ruptured plane circumferences of Achilles tendon in the affected side increased to 2.2 mm compared with the ***:Kor early Achilles tendon rupture,internal fixation of steel-wire limited loop can recover the ankle function better,return to the preinjury state in the shortest lime,and has few complications.

关键词： Achilles tendon rupture Steel-wire limited loop Internal fixation Ankle function

Using a fretsaw in treating chronic penial incarceration:A case report

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2022年第2期10卷 747-752页

作者： Yi zhao Xiao-Qiang Xue hou-Feng Huang Yi Xie Zhi-Gang Ji xin-Rong Fan Department of Urology Peking Union Medical College HospitalBeijing 100730China

BACKGROUND Penial incarceration(PI)is a rare *** is usually caused by a foreign object which strangulates at the base of the *** may derive from pranks,sexual demand,mental disease,or intention to prohibit urinary ***,these situations are emergent and immediate treatments are *** of chronic PI are less reported,and their treating methods are yet to be *** SUMMARY We reported a case on treating a 73-year-old male who had PI with a metallic hoop for three *** multidisciplinary consultation,the operation was performed successfully with the help of a *** the chronic strangulation,the prognosis of the patient was *** the best of our knowledge,this case was rare and precious as it featured the longest strangulating time,which might enlighten the treating process of future PI ***,we have reviewed and summarized major published cases to encapsulate appropriate approaches when facing diverse strangulation *** The selection of surgical tools depends on the material of the strangulating objects,the availability of equipment,and the severity of the penial *** urination function may not be affected after three months of incarceration as in our case,whilst prudent preoperative measures and multidisciplinary evaluations are always *** using a fretsaw is comparatively slow,it is safe and feasible to treat metallic penial incarceration.

Preparation and properties of thermoexpandable polymeric microspheres

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2014年第9期25卷 1279-1281页

作者： zhao-Sheng hou Cheng-You Kan College of Chemistry Chemical Engineering and Materials ScienceCollaborative Innovation Center of Functionalized Probes for Chemical ImagingKey Laboratory of Molecular and Nano ProbesMinistry of EducationShandong Normal University Department of Chemical Engineering Tsinghua University

In this paper, thermoexpandable polymeric microspheres were prepared by suspension polymerization with acrylonitrile （AN） and methyl methacrylate （MMA） as monomers and/-butane as a blowing agent. The micromorphology and thermal stability were researched by polarized microscopy and TGA. The diameter of the expandable microspheres increased from about 20μm （unexpanded） to 40-80 μm （expanded） upon heating. The maximum expansion volume was higher than 22 times of the original volume and the density of the expanded microspheres was about 16.7 kg/m3. The blowing agent content in microspheres was about 20 wt% and To.e., Tm.e. and To.s. were 80℃, 120-130℃ and 140-145℃, respectively.

关键词： Expandable microspheres Suspension polymerization Methyl methacrylate Properties

Effect of Nuclear Binding Energy to K Factor

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2007年第4期47卷 690-694页

作者： hou zhao-Yu GUO Ai-Qiang Department of Mathematics and Physics Shijiazhuang Railway Institute Shijiazhuang 050043 China Department of Physics Hebei Normal University Shijiazhuang 050016 China

We modify the square of virtual photon four-momentum by using nuclear binding energy formula, and calculate the effect of nuclear binding energy to K factor and Compton subprocess and annihilate subprocess in A-A collision Drell-Yan process. The outcome indicates that the effect of nuclear binding energy to K factor is obvious in little x region and it would disappear gradually as x increases.

关键词： Drell-Yan process nuclear binding energy K factor

Adaptive H∞control of polynomial Hamiltonian systems via symbolic computation:controller parameterisation

在线全文

学校读者我要写书评

暂无评论

Journal of Control and Decision 2020年第2期7卷 160-177页

作者： Zhong Cao Xiaorong hou Wenjing zhao School of Physics and Electronic Engineering Guangzhou UniversityGuangzhou510006People’s Republic of China Mathematical Educational Software of Engineering Technology Research Center of Guangdong Province Guangzhou510006People’s Republic of China School of Automation Engineering University of Electronic Science and Technology of ChinaChengduPeople’s Republic of China Lab Center Guangzhou UniversityGuangzhouPeople’s Republic of China

This paper deals with controller parameterisation method of adaptive H∞control for polynomial Hamiltonian systems(PHSs)with disturbances and unknown *** design a simplified controller with a set of tuning parameters which can guarantee that the systems are adaptive H∞stable by using Hamiltonian function ***,a method for solving the set of tuning parameters of the controller with symbolic computation is *** proposed parameterisation method avoids solving Hamilton–Jacobi–Issacs(HJI)equations and the obtained controller is easier as compared to some existing *** example shows that the controller is effective as it can optimise adaptive H∞control by adjusting tuning *** these results are expected to be of use in the study of adaptive H∞control for nonlinear systems with disturbances and unknown parameters.

关键词： Symbolic computation polynomial Hamiltonian systems(PHSs) tuning parameters adaptive H∞control

Tunable fabrication of single-crystalline CsPbI_(3) nanobelts and their application as photodetectors

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2021年第6期28卷 1030-1037页

作者： Tao Yang Ya-peng Zheng Kuo-Chih Chou xin-mei hou Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing 100083China

Lead halide perovskites have received increasing attention recently as a candidate material in various optoelectronic areas because of their high performance as light ***,we report the growth of CsPbI_(3) nanobelts via a solution process.A single-crystalline CsPbI_(3) nanobelt with uniform morphology can be achieved by controlling the amount of PbI_(2).A single-crystalline CsPbI_(3) nanobelt possesses a mean width,length,and thickness of 100 nm,5μm,and 20 nm,*** this work,photodetectors(PDs)based on individual CsPbI_(3) nanobelts are constructed and found to perform well with an external quantum efficiency and responsivity of 2.39×10^(5)% and 770 A/W,*** PDs also show a high detectivity of up to 3.12×10^(12) Jones,which is at par with that of Si *** PDs developed in this work exhibit great promise in various optoelectronic nanodevices.

关键词： photodetector cesium lead triiodide perovskite nanobelt detectivity

High-performance chromite by structure stabilization treatment

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2020年第2期27卷 169-179页

作者： En-hui Wang Chang Luo Jun-hong Chen xin-mei hou Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing 100083China School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China

Chromite is an important raw material applied in *** have been made to obtain high-performance chromite by adding MgO and Al203 from the viewpoint of structure *** order to explore the effect of Al203 and MgO on the structure,two formulas,i.e.,Mg-rich and Al-rich ones,were *** phase and microstructure development of samples heated in the temperature range of 1200-1600℃ were studied by X-ray diffraction and scanning electron microscopy with energy-dispersive *** and Al203 added have diffused into chromite successfully by heat *** diffuses into chromite,occupying the tetrahedral vacancies caused by the diffusion and oxidation of Fe2+ions to stabilize the ***203 diffuses into the surface layer of chromite,forming spinel-sesquioxide ***-rich sample which has spinel-sesquioxide structure shows better corrosion resistance toward fayalite slag than Mg-rich sample which has single spinel structure by blocking the interdiffusion between Fe^2+ions in fayalite slag and Mg^2+ions in chromite.

关键词： Chromite Structure optimization Corrosion resistance Refractory