检索结果-南通市图书馆

A 3D Supramolecular Cu(Ⅰ) Compound Obtained by in situ Hydrolysis, Deaminization, Reduction and Self-assemble Reaction

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2020年第9期39卷 1735-1739,1558页

作者： AN Zhe teng jun-Jiang School of Chemistry Guangdong University of Petrochemical TechnologyMaoming 525000China

A new Cu(Ⅰ)coordination polymer,[Cu4(MA)2(HCA)2]n(1,MA=melamine,H3CA=cyanuric acid),has been synthesized under hydrothermal conditions using CuCl2·2H2O and MA as the starting ***,cyanuric acid was obtained by the in situ hydrolysis and the deaminization of melamine,and the Cu(Ⅰ)ion was obtained by the in situ reduction of Cu(Ⅱ)ion during the self-assembly *** crystal structure is of monoclinic,space group Pc with a=3.539(3),b=22.377(2),c=15.844(1)?,β=90.723(1)o,V=1254.6(2)?3,C12H14Cu4N18O6,Mr=760.61,Z=2,Dc=2.013 g/cm3,F(000)=752,μ=3.426 mm-1,R=0.0479 and wR=0.1243 for 3172 observed reflections(I>2s(I)).The crystal structural analysis revealed that the cooperation of coordinate-covalent bonds,intermolecular hydrogen bonds andπ-πinteractions give rise to a 3D supramolecular framework with 5-connected BN ***,the thermal stability and luminescent property of 1 were also investigated.

关键词： Cu(Ⅰ) solvothermal synthesis supramolecular framework luminescent property

Phase Structure and Crystallization Behavior of Polyethylene in Its Blends with cis-1,4-Butadiene Rubber

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2015年第3期33卷 386-394页

作者： Hong Yao jun-teng Liu Li-qun Zhang 闫寿科 Beijing Key Laboratory of Membrane Science & State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology

Phase structure and crystallization behavior of polyethylene （PE） in its blends with cis-1,4-butadiene rubber （BR） at different blend ratios and sample preparation conditions were studied. The PE is finely dispersed in the BR matrix. For samples hot pressed at 145 ℃, circular PE microdomains with randomly oriented PE lamellar aggregates were produced. The domain size and number increase with increasing PE content. When the PE content is over 10 wt%, most of the PE domains impinged each other. The separated PE domains are connected by PE stripes with parallel arranged lamellar aggregates. For samples hot pressed at 140 ℃, elongated PE microdomains with oriented PE lamellar aggregates were obtained due to the shear flow. The crystallization of PE in the blends depends on the phase structure. Confined crystallization of PE occurs in small microdomains at relatively low temperature. With the increase of domain size, the crystallization ability of PE increases while the confined crystallization decreases.

关键词： Polyethylene cis-1,4-Butadiene rubber Blend Crystallization Morphology.

Transmission ratio (T_n) in the radian direction normal to joints in 2-D compressional wave propagation in rock masses

在线全文

学校读者我要写书评

暂无评论

Journal of University of Science and Technology Beijing 2006年第3期13卷 199-206页

作者： Weidong Lei jun teng Ashraf Mohamed Hefny Jian Zhao Department of Urban and Civil Engineering Shenzhen Graduate School Harbin Institute of Technology Shenzhen 518055 China School of Civil and Environmental Engineering Nanyang Technological University Singapore 639798 Singapore Ecole Polytechnique Federale de Lausanne （EPFL） Rock Mechanics Laboratory Lausanne CH-1015 Switzerland College of Architecture and Civil Engineering China University of Mining and Technology Xuzhou 221008 China

The transmission ratio along the radian direction normal to the joints was studied in the Universal Distinct Element Code （UDEC）. The variation of the transmission ratio with the ratio of joint spacing to wavelength was generalized into a general curve, which was determined by two critical points. The relationship between the two critical points and the affecting factors, quantity of joints and the normalized normal stiffness of joints, were obtained. A prediction model of the transmission ratio in the radian direction normal to the joints was proposed. The proposed model was applied to a field explosion test. The estimated values of the peak particle velocity from the prediction model were compared with the field records. The comparisons showed that the prediction model of the transmission ratio in the direction normal to the joints in the process of 2-D compressional wave propagation through multiple parallel joints is reliable.

关键词： 2-D compressional wave wave propagation transmission ratio field explosion test

Crystallization Behavior of Disproportionately High and Low Molecular Weight PEO Blends

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2014年第9期32卷 1199-1209页

作者： Li Li jun-teng Liu Zhong-jie Ren 闫寿科 Department of Chemistry and Chemical Engineering Heze University Beijing Key Laboratory of Membrane Science & State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology

The crystallization behavior of PEOs with molecular weight of 1 Ok and 200k as well as their blends was studied in details. The results show that the lower molecular weight PEO crystallizes with faster crystallization rate as judged from a shorter time for completing the crystallization. On the other hand, the higher molecular weight PEO crystallizes at relatively higher temperature, indicating an early start of crystallization compared with the lower molecular weight one. The blends of these two PEOs with different blend ratios always cocrystallize during the cooling processes. It is confirmed that mixing of the 10k PEO with the 200k one is in favor of the crystallization of the system. This is not only demonstrated by the early start of the crystallization at higher crystallization temperature, and also a faster crystal growth of the blend with respect to the 200k PEO. The crystallization of the blends at higher temperature is caused by an early start of nucleation and an increment of nucleus density. This may originate from the density fluctuation of the blend and a reduction in energy barrier for nucleation. Moreover, it is found that the crystallinity of the 1 Ok PEO rich blends increases with increasing concentration of the 10k PEO. This is caused by the solvent effect of the 10k PEO toward the 200k PEO. On the other hand, the crystallinity of the 30/70 （10k/200k） PEO blend is decreased a little bit. This may be a balanced result of the improved crystallization of the 200k PEO at the expense of the high crystallization ability of the 1 Ok PEO.

关键词： PEO Molecular weight Blend Crystallization Morphology.

Estimation on structural responses using multi scale measurements

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2014年第9期57卷 1707-1713页

作者： LU Wei WU FengQi teng jun ZHOU QiuShi Department of Civil and Environmental Engineering Harbin Institute of Technology Shenzhen Graduate School Shenzhen Capol International & Associates Group

Different measurands from the different types of sensors can obtain different information regarding the structural behavior in a real structural health monitoring *** enrich information and estimate the structural responses based on much more known information,the estimation on structural responses using multi scale measurements from multi-type sensors is proposed in this *** identification is constructed with the pattern library given by strain measurements and deformation *** the uncertainty of the measurements as well as to enhance the robustness of the proposed algorithm,more than one best pattern is selected to synthesize the finally estimated stress *** validate the capacity of the proposed acquisition method using multi scale measurements,finite element model analysis is conducted to estimate the structural stress response in Shenzhen Bay Stadium as an *** performance of the pattern identifications,constructed by two kinds of pattern libraries captured by sole strain measurement,and multi scale measurements which are constructed by both kinds of strain measurements and deformation measurements,respectively,are compared in this paper to observe measurements constructed from strain measurements and deformation measurements outperformed *** analysis for a series of parametric studies in which noise at different levels has also included in the measurements are further carried out,and robustness of the proposed information acquisition scheme under noisy measurement is demonstrated.

关键词： structural health monitoring multi scale sensor measurements pattern identification information fusion

Fiber damage analysis model for RC beam-column based on EEP super-convergent computation

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2011年第10期54卷 2542-2548页

作者： teng jun LI ZuoHua OU JinPing HE XueFeng Shenzhen Graduate School Harbin Institute of Technology Shenzhen 518055 China School of Civil Engineering Dalian University of Technology Dalian 116024 China Shenzhen Municipal Design & Research Institute Co. Ltd. Shenzhen 518029 China

A new numerical strategy to model nonlinear damage behavior of RC beam-column member based on level of material and superconvergent computation is presented in this paper. A fiber damage analysis model (FDAM) for RC beam-column member is established by analyzing section of fiber beam column element with the uniaxial damage constitutive relations of con-crete. The damage index of RC member through statistical analysis of concrete fibers damage is defined in the extreme section of beam elements, which can describe the nonlinear damage behavior of RC beam-column member under any loadings. The newly proposed element energy projection (EEP) method is applied to the inelastic analysis of FDAM. EEP superconvergent formulas for section forces and deformations of beam-column are established, and general algorithm and numerical strategy adopting EEP super-convergent computation for section deformation increment are proposed in the classical Newton-Raphson process. Both analysis and numerical test show that the EEP method can effectively find out the nonlinear feature of the distribution, and accurately obtain the damage distribution of RC beamcolumn. The proposed numerical scheme in this paper proves to be effective and convenient in its use and can be easily integrated into the present inelastic FEM programs of structure analysis.

关键词： RC beam-column seismic damage model fiber model EEP section integration

Non-destructive Evaluation of Absolute Stress in Steel Members Using Shear-Wave Spectroscopy

在线全文

学校读者我要写书评

暂无评论

Transactions of Nanjing University of Aeronautics and Astronautics 2018年第2期35卷 236-243页

作者： Liu Diankun He Jingbo Li Zuohua teng jun Shenzhen Graduate School Harbin Institute of Technology

Non-destructive measurement of absolute stress in steel members can provide useful information to optimize the design of steel structures and allow the safety of existing structures to be *** paper investigates the non-destructive capability of ultrasonic shear-wave spectroscopy in absolute stress evaluation of steel *** effect of steel-member stress on the shear-wave amplitude spectrum is investigated,and a method of absolute stress measurement is ***,the process for evaluating absolute stress using shear-wave spectroscopy is *** steel members are employed to investigate the relationship between the stress and the frequency in shear-wave echo amplitude *** H-beam loaded by the universal testing machine is evaluated by the proposed method and the traditional strain gauge method for *** results show that the proposed method is effective and accurate for determining absolute stress in steel members.

关键词： absolute stress evaluation ultrasonic shear wave spectroscopy amplitude spectrum steel members non destructive testing method

Chronic colchicine poisoning with neuromyopathy,gastric ulcers and myelosuppression in a gout patient:A case report

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2021年第35期9卷 11050-11055页

作者： Meng-Mei Li jun teng Yan Wang Department of Emergency Qingdao Central HospitalThe Second Affiliated Hospital of Qingdao University Medical CollegeQingdao 266042Shandong ProvinceChina

Colchicine has been widely used as an anti-gout medication over the past ***,it is less commonly used due to its narrow therapeutic range,meaning that its lethal dose is close to its therapeutic *** lethal dose of colchicine is considered to be 0.8 mg/*** chronic colchicine poisoning has multiple manifestations,it poses a challenge in the clinician’s differential ***,the drug was important in treating gout;however,clinical studies are currently underway regarding the use of colchicine in patients with coronavirus disease 2019 as well as its use in coronary artery disease,making this drug more important in clinical *** SUMMARY A 61-year-old male with a history of gout and chronic colchicine intake was admitted to our Emergency Department due to numbness and weakness of the lower *** patient reported a history of colchicine intake for 23 *** thorough examination,he was diagnosed with colchicine poisoning,manifesting as neuromyopathy,multiple gastric ulcers and *** advised him to stop taking colchicine and drinking *** also provided a prescription of lansoprazole and mecobalamin,and then asked him to return to the clinic for *** patient was followed up for 3-mo during which time his gout symptoms were controlled to the point where he was *** Colchicine overdose can mimic the clinical manifestations of several *** easily pay attention to the disease while ignoring the cause of the ***,the patient’s medication history should never be ignored.

关键词： Colchicine poisoning Neuromyopathy Myelosuppression Gastric ulcer Gout Case report

Model Reduction Methods for High-Rise Buildings with Active Mass Damper Control Systems

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Harbin Institute of Technology(New Series) 2013年第6期20卷 37-45页

作者： jun teng Hou-Bing Xing Cheng-Yin Liu Shenzhen Key Lab of Urban & Civil Engineering Disaster Prevention & Reduction Harbin Institute of Technology Shenzhen Graduate School

To improve the performance of an active mass damper control system,the controller should be designed based on a reduced-order model. An improved method based on balanced truncation method was proposed to reduce the dimension of high-rise buildings,and was compared with other widely used reduction methods by using a framework with ten floors. This optimized method has improvement of reduction process and choice of the order. Based on the reduced-order model obtained by the improved method and pole-assignment algorithm,a controller was designed. Finally,a comparative analysis of structural responses,transfer functions,and poles was conducted on an actual high-rise building. The results show the effectiveness of the improved method.

关键词： high-rise building active mass damper model reduction controller designCLC number:TU352 Document code:AArticle ID:1005-9113(2013)06-0037-09