检索结果-南通市图书馆

Photocatalytic properties of CaTi_(2)O_(5)via a facile additive-free aqueous strategy with different pH values

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

Rare Metals 2021年第7期40卷 1746-1752页

作者： Wei-Xia Dong Qi-Fu bao X-YGu Hui-juan Shen Peng-Yan Liu Department of Material Science and Engineering Jingdezhen Ceramic InstituteJingdezhen 333001China

CaTi_(2)O_(5)was selectively prepared by a solvothermal process without template and *** phase of the as-prepared samples was determined by X-ray diffraction(XRD).The microstructure was characterized by scanning electron microscopy(SEM)and transmission electron microscopy(TEM).Results found that pH values had a crucial effect on the crystal phase and shape evolution of the ***_(2)O_(5)sample prepared at pH of 5.2 shows high efficient light harvesting,large surface area and ***,CaTi_(2)O_(5)shuttle-like sample shows good photocatalytic activity against methyl orange due to its longer and thinner shuttle-like morphology and high crystallinity,enhanced light harvesting and large surface *** photocatalytic rate of CaTi_(2)O_(5)shuttle-like structure reaches 0.1988 min-1 for 25-min methyl orange degradation under the ultraviolet light irradiation and displays an excellent photostability with a degradation efficiency of 0.1952 min^(-1)after four cycles.

关键词： pH CaTi_(2)O_(5) Solvothermal method Photocatalytic properties

Deep drawing of aluminum alloy 7075 using hot stamping

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2017年第6期36卷 485-493页

作者： Wen-Chao Xiao bao-Yu Wang Yi kang Wei-Ping Ma Xue-Feng Tang School of Mechanical Engineering University of Science and Technology Beijing Beijing 100083 China

In this paper, simulations of deep drawing tests at elevated temperatures were carried out with experimental validation. The aim of this work was to study the effect of process parameters on formability and mechanical properties of aluminum alloy 7075 in hot stamping *** parameters, including blank temperature, stamping speed, blank holder force and friction coefficient, were studied. Stamping tests were conducted at temperatures between 350 and 500 ℃, blank holder force between 0 and 10 kN, stamping speed between 50 and 150 mm·s^-1, and friction coefficient between 0.1 and 0.3. Based on the analysis, it is shown that thickness homogeneity could be improved when the blank is formed at lower temperature,lower blank holder force and lower friction *** could be improved when the blank was well lubricated at about 400 ℃. Formability at stamping speed 50 mm·s^-1 is far better than those at other speeds. The mechanical property analysis shows that the hot stamping process could make the formed part to obtain high quality.

关键词： Aluminum alloy 7075 Aluminum hotstamping Process parameters Formability Mechanicalproperty

Suxiao Jiuxin Pills Prevent Ventricular Fibrillation from Inhibiting L-type Calcium Currents CaV1.2 in vivo and in vitro

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Integrative Medicine 2023年第2期29卷 108-118页

作者： QI Jian-yong kang Dong-yuan YU juan ZHANG Min-zhou Acute Myocardial Infarction Key Laboratory of Chinese Medicine in Guangzhou the 2nd Affiliated Hospital of Guangzhou University of Chinese MedicineGuangdong Province Hospital of Chinese MedicineGuangzhou 510006China Intensive Care Research Team of Traditional Chinese Medicine the 2nd Affiliated Hospital of Guangzhou University of Chinese MedicineGuangdong Province Hospital of Chinese MedicineGuangzhou 510006China Animal Center the 2nd Affiliated Hospital of Guangzhou University of Chinese MedicineGuangdong Province Hospital of Chinese MedicineGuangdong Province Academy of Chinese MedicineGuangzhou 510006China

Objective: To investigate whether Suxiao Jiuxin Pills(SJP), a Chinese herbal remedy, is an anti-ventricular fibrillation(VF) agent. Methods: VF was induced by isoproterenolol(ISO) intraperitoneal injection followed by electrical pacing in mice and rabbits. The effects of SJP on the L-type calcium channel current(CaV1.2), voltage-dependent sodium channel current(INa), rapid and slow delayed rectifier potassium channel current(IKr and IKs, respectively) were studied by whole-cell patch-clamp method. Computer simulation was implemented to incorporate the experimental data of SJP effects on the CaV1.2 current into the action potential(AP) and pseudo-electrocardiography(pseudo-ECG) models. Results: SJP prevented VF induction and reduced VF durations significantly in mice and rabbits. Patch-clamp experiments revealed that SJP decreased the peak amplitude of the CaV1.2 current with a half maximal concentration(IC50) value of 16.9 mg/L(SJP-30 mg/L, –32.8±6.1 pA;Verapamil, –16.2±1.8 pA;vs. control, –234.5±16.7 pA, P0.05). Computer simulation showed that SJP-reduced CaV1.2 current shortened the AP duration,transiting VF into sinus rhythm in pseudo-ECG. Conclusion: SJP reduced VF via inhibiting the CaV1.2 current with in vivo, in vitro, and in silico studies, which provide experimental basis for SJP anti-VF clinical application.

关键词： Suxiao Jiuxin Pills ventricular fibrillation patch clamp simulation CaV1.2

Optical absorption in asymmetrical Gaussian potential quantum dot under the application of an electric field

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2020年第8期29卷 437-440页

作者： Xue-Chao Li Chun-bao Ye juan Gao Bing Wang Optoelectronics Physics Anhui University of Science and TechnologyHuainan 232001China

We theoretically investigate the optical absorption coefficient(OAC)in asymmetrical Gaussian potential quantum dots subject to an applied electric *** wave functions together with energies of electron energies in an effective mass approximation framework are *** OAC is expressed according to the iterative method and the compact-density-matrix *** on our results,OAC is sensitively dependent on external electric field together with the incident optical ***,peak shifts into greater energy as the quantum dot radius ***,the parameters of Gaussian potential have a significant influence on the OAC.

关键词： electric field optical absorption quantum dot

Degradation of a fullerene end-capped polycaprolactone by lipase AK

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2010年第29期55卷 3279-3282页

作者： PENG QiYun kang Feng LI juan YANG XinLin School of Life Science and Technology Beijing Institute of Technology Beijing 100081 China

Using titrimetric method,enzymatic behavior of lipase AK against fullerene end-capped polycaprolactone(C60-PCL) was studied for the first time,compared with polycaprolactone(PCL).The results showed that degradation of both C60-PCL and PCL by lipase followed Mechaelis-Menten equation,with the degradation parameters of PCL and C60-PCL were 0.75 mg mL-1 and 0.16 mg mL-1 for Km,and 0.90 mL h-1 and 0.43 mL h-1 for Vmax,respectively.C60-PCL had a slower degradation rate than PCL under the same *** data indicated that the introduction of fullerene enabled PCL hard to be degraded by lipase.

关键词：聚己内酯脂肪酶富勒烯降解酶封端 PCL C60 米氏方程

Effect of family caregiver nursing education on patients with rheumatoid arthritis and its impact factors:A randomized controlled trial

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28期9卷 8413-8424页

作者： Jing Li Ying Zhang Ya-juan kang Nan Ma Department of Immunology and Rheumatology The Third Hospital of Hebei Medical UniversityShijiazhuang 050051Hebei ProvinceChina

BACKGROUND Rheumatoid arthritis(RA)is a common autoimmune *** education for family caregivers is considered a workable and effective intervention,but the validity of this intervention in RA has not been *** To explore whether family caregiver nursing education(FCNE)works on patients with RA and the factors that influence *** In this randomized controlled study,a sample of 158 pairs was included in the study with 80 in the intervention group and 78 in the control *** data of patients and caregivers was *** FCNE intervention was admi-nistered to caregivers,and inflammation level indicators,disease activity indicators and mood disorder indicators of patients were followed up and *** Baseline characteristics of the intervention and the control groups had no significant *** were significantly reduced in the intervention group compared to the control *** intervention group showed significant differences in stratification of relationship,education duration and *** The effect of FCNE on RA is multifaceted,weakening inflammation level,alleviating disease activity and relieving mood *** between caregiver and patient,caregiver’s education level and patient’s age may act as impact factors of FCNE.

关键词： Nursing education Family nursing Rheumatoid arthritis Family caregivers Depression Anxiety

Force-sensitive properties of FeCuNbSiB powder/silicone rubber composite films

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

Rare Metals 2016年第10期35卷 784-789页

作者： Jia Zhou Zheng-Hou Zhu Xiao-Min Li kang Du bao-Ying Qiao Yuan Fu School of Materials and Engineering Nanchang University

Composite films of different contents were prepared by Fe73.5Cu1Nb3Si13.5B9 powder as compound phase and silicone rubber as matrix phase. The thickness of film is 200 μm. Values of impedance, Z, under pressure stress were measured by TH2816LCR digital bridge. LYYL-500N high-grade-type microcomputer control pressure testing machine was used to conduct program control loading with a speed of 0.1 mm·min^-1. The results show that composite films of different contents （25 vol%, 30 vol%, and 35 vol%） have excellent force-sensitive properties in both loading process and unloading process, especially when the stress is below 0.2 MPa, the stress- impedance （SI） and ＋｜k｜ values of composite films are much higher than that in the range of 0.2-1.0 MPa. The force- sensitive properties of loading process are superior to unloading process. While the frequency is 1 kHz, the force-sensitive properties of composite films are better than 50 kHz. The optimal temperature of powder heat treatment is 500 ℃. Composite film which was prepared by this kind of powder has a good force-sensitive property.

关键词： Composite films Stress-impedance effect Force-sensitive properties

Attitude maneuver of liquid-filled spacecraft with a flexible appendage by momentum wheel

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 2012年第2期28卷 543-550页

作者： Dan-Dan Yang bao-Zeng Yue Wen-Jun Wu Xiao-juan Song Le-Mei Zhu Department of Mechanics School of Aerospace EngineeringBeijing Institute of Technology100081 BeijingChina

Attitude maneuver of liquid-filled spacecraft with an appendage as a cantilever beam by momentum wheel is studied. The dynamic equations are derived by conserva- tion of angular momentum and force equilibrium principle. A feedback control strategy of the momentum wheel is ap- plied for the attitude maneuver. The residual nutation of the spacecraft in maneuver process changes with some chosen parameters, such as steady state time, locations of the liq- uid container and the appendage, and appendage parame- ters. The results indicate that locations in the second and fourth quadrants of the body-fixed coordinate system and the second quadrant of the wall of the main body are better choices *** the liquid containers and the appendage than other locations if they can be placed randomly. Higher density and thicker cross section are better for lowering the residual nutation if they can be changed. Light appendage can be modeled as a rigid body, which results in a larger residual nutation than a flexible model though. The resid- ual nutation decreases with increasing absolute value of the initial sloshing angular height.

关键词： Liquid-filled spacecraft Appendage Attitude maneuver Momentum wheel Steady state time Residual nutation

Uniaxial Time-Dependent Ratcheting of SS304 Stainless Steel at High Temperatures

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2007年第1期14卷 53-59页

作者： kang Guo-zheng ZHANG juan SUN Ya-fang KAN Qian-hua Department of Applied Mechanics and Engineering Southwest Jiaotong University Chengdu 610031 Sichuan China

The uniaxial time-dependent strain cyclic behaviors and ratcheting of SS304 stainless steel were studied at high temperatures （350 ℃ and 700 ℃）. The effects of straining and stressing rates, holding time at the peak and/or valley of each cycle in addition to ambient temperature on the cyclic softening/hardening behavior and ratcheting of the material were discussed. It can be seen from experimental results that the material presents remarkable time dependence at 700 ℃, and the ratcheting strain depends greatly on the stressing rate, holding time and ambient temperature. Some significant conclusions are obtained, which are useful to build a constitutive model describiog the time-dependent cyclic deformation of the material.

关键词： SS304 stainless steel time dependence ratcheting high temperature