检索结果-南通市图书馆

Journal of Materials Science & Technology 2021年第16期75卷 59-67页

作者： Shumin Zhang hu dong Changsheng An Zhongfu Li Difa Xu Kaiqiang Xu Zhaohui Wu Jie Shen Xiaohua Chen Shiying Zhang College of Materials Science and Engineering Hunan UniversityChangsha410082China hunan Key Laboratory of Applied Environmental Photocatalysis Changsha UniversityChangsha 410005Hunan ProvinceChina School of Physics and Electronics Hunan Normal University410081China

Constructing noble-metal-free loaded catalyst with high-efficiency photocatalytic activity by a simple and scalable method is of profound significance for fundamental research and practical ***,a simple one-pot method was used to synthesize novel samples of array-like sulfur-doped graphitic carbon nitride(SCN)nanosheets with ultrathin MoS2 loading(MS/SCN-x%).The ultrathin MoS2 cocatalyst was evenly distributed on the surface of SCN and was linked to the main catalyst by covalent chemical *** from the multiple advantages of the array-like porous nanosheets structure with rich exposed surface,covalent cross-linking structure,and enhanced visible light absorption,the MS/SCN-2.5%composites drastically improve hydrogen evolution performance,which is superior to original MoS2 nanosheet modified by two-step mixing method,and also rivals with Pt/*** designing strategy of photocatalyst modified by noble-metal-free cocatalyst with covalent bond structure provides fascinating insights into enhanced photocatalytic hydrogen evolution.

关键词： Carbon nitride Noble-metal-free cocatalyst Covalent cross-linking Photocatalytic hydrogen evolution

Feasibility and simulation model of a pilot scale membrane bioreactor for wastewater treatment and reuse from Chinese traditional medicine

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2007年第2期19卷 129-134页

作者： REN Nan-qi YAN Xian-feng CHEN Zhao-bo hu dong-xue GONG Man-li GUO Wan-qian School of Municipal and Environmental Engineering Harbin Institute of Technology Harbin 150090 China School of Power and Nuclear Engineering Harbin Engineering University Harbin 150001 China

The lack and pollution of water resource make wastewater reuse necessary. The pilot scale long-term tests for submerged membrane bioreactor were conducted to treat the effluents of anaerobic or aerobic treatment process for the high-strength Chinese traditional medicine wastewater. This article was focused on the feasibility of the wastewater treatment and reuse at shorter hydraulic retention time （HRT） of 5.0, 3.2 and 2.13 h. MLSS growth, membrane flux, vacuum values and chemical cleaning periods were also investigated. The experimental results of treating two-phase anaerobic treatment effluent demonstrated that the CODfilt was less than 100 mg/L when the influent COD was between 500-10000 mg/L at HRT of 5.0 h, which could satisfy the normal discharged standard in China. The experimental results to treat cross flow aerobic reactor effluent demonstrated that the average value of CODfilt was 17.28 mg/L when the average value of influent COD was 192.84 mg/L at HRT of 2.13 h during 106 d, which could completely meet the normal standard for water reuse. The maximum MLSS and MLVSS reached 24000 and 14500 mg/L at HRT of 3.2 h respectively. Membrane flux had maximal resume degrees of 94.7% at vacuum value of 0.02 MPa after cleaning. Chemical cleaning periods of membrane module were 150 d. A simulation model of operational parameters was also established based on the theory of back propagation neural network and linear regression of traditional mathematical model. The simulation model showed that the optimum operational parameters were suggested as follows： HRT was 5.0 h, SRT was 100 d, the range of COD loading rate was between 10.664-20.451 kg/（m3.d）, the range of MLSS was between 7543-13694 mg/L.

关键词： submerged membrane bioreactor (SMBR) Chinese traditional medicine wastewater hydraulic retention time (HRT) simulation model pilot scale test

Ds-echinoside A,a new triterpene glycoside derived from sea cucumber,exhibits antimetastatic activity via the inhibition of NF-κB-dependent MMP-9 and VEGF expressions

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2011年第7期12卷 534-544页

作者： Qin ZHAO Zhi-dong LIU Yong XUE Jing-feng WANG hui LI Qing-juan TANG Yu-ming WANG Ping dong Chang-hu XUE College of Food Science and Engineering Ocean University of China Qingdao 266003 China

Ds-echinoside A (DSEA),a non-sulfated triterpene glycoside,was isolated from the sea cucumber Pearsonothuria *** vitro and in vivo investigations were conducted on the effects of DSEA on tumor cell adhesion,migration,invasion,and *** this study,we found that DSEA inhibited the proliferation of human hepatocellular liver carcinoma cells Hep G2,with a half-maximal inhibitory concentration (IC50) of 2.65 μmol/L,and suppressed Hep G2 cell adhesion,migration,and invasion in a dose-dependent *** also reduced tube formation of human endothelial cells ECV-304 on matrigel in vitro and attenuated neovascularization in the chick embryo chorioallantoic membrane (CAM) assay in *** analysis revealed that DSEA significantly decreased the expression of matrix metalloproteinase-9 (MMP-9),which plays an important role in the degradation of basement membrane in tumor metastasis and *** also increased the protein expression level of tissue inhibitor of metalloproteinase-1 (TIMP-1),an important regulator of MMP-9 *** the results of Western blotting,the expressions of nuclear factor-kappa B (NF-κB) and vascular endothelial growth factor (VEGF) were found to be remarkably reduced by *** findings suggest that DSEA exhibits a significant antimetastatic activity through the specific inhibition of NF-κB-dependent MMP-9 and VEGF expressions.

关键词： Triterpene glycoside Ds-echinoside A (DSEA) Metastasis Angiogenesis Nuclear factor-κB (NF-κB) Matrix metalloproteinase-9 (MMP-9) Vascular endothelial growth factor (VEGF)

Chemical Constituents from the Whole Plant of Cuscuta reflexa

在线全文

学校读者我要写书评

暂无评论

Natural Products and Bioprospecting 2020年第5期10卷 337-344页

作者： Tin Thu Thu Aung Meng-Yuan Xia Pyae Phyo Hein Rong Tang dong-dong Zhang Jun Yang Xue-Fei Yang dong-Bao hu Yue-hu Wang Key Laboratory of Economic Plants and Biotechnology and the Yunnan Key Laboratory for Wild Plant Resources Kunming Institute of BotanyChinese Academy of SciencesKunming 650201People’s Republic of China School of Chemical Biology and Environment Yuxi Normal UniversityYuxi 653100People’s Republic of China University of Chinese Academy of Sciences Beijing 100049People’s Republic of China Southeast Asia Biodiversity Research Institute Chinese Academy of SciencesYezinNay Pyi Taw 05282Myanmar

Two new 2H-pyran-2-one glucosides,cuscutarosides A(1)and B(2),and one new steroidal glucoside,7β-methoxy-β-sitosterol 3-O-β-glucopyranoside(3),together with 12 known compounds(4-15)were isolated from the whole plant of Cuscuta reflexa(Convolvulaceae)collected from *** chemical structures of these new compounds were elucidated based on extensive spectroscopic *** antiobesity activity of these isolates was evaluated using porcine pancreatic lipase(PPL),and the antiplatelet aggregation activity was screened using rabbit platelets induced by thrombin,platelet-activating factor(PAF),arachidonate(AA),or collagen.7β-Methoxy-β-sitosterol 3-O-β-glucopyranoside(3)showed weak PPL inhibitory *** A(1),its acetylated derivative(1a),and scrophenoside B(8)showed weak inhibitory activity against rabbit platelet aggregation induced by *** 1a also showed inhibitory activity against rabbit platelet aggregation induced by AA.

关键词： Cuscuta reflexa Porcine pancreatic lipase Platelet aggregation 2H-pyran-2-one glucosides Steroidal glucosides

Activation and shutdown dose-rate analyses for the EAST NBI test facility

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

Nuclear Science and Techniques 2016年第4期27卷 60-66页

作者： Yu-Qing Chen Ji Wang Bin Wu Jun Li Ya-Hong Xie Guo-Qiang Zhong Chun-dong hu Institute of Plasma Physics Chinese Academy of Sciences

An analysis of the neutron activation and shutdown dose rates was performed for the EAST high-power deuterium neutral beam injector test facility(EAST NBITF) by using the multiparticle transport code FLUKA2011.2. Also, the neutron and neutron-induced gamma spectra of the facility's vacuum vessel were evaluated. The results identified the major radionuclides^(99) Mo,^(65)Ni,^(58) Co,^(56)Mn, and^(51) Cr for the vacuum vessel and the primary nuclide^(64) Cu for both the ion dump and the *** simulated results indicated that, when the EAST NBITF operates within the design parameters of deuterium energy 80 ke V, current 50 A, and pulse 100 s, the neutron intensity will achieve 10^(11)n/s with no radiation safety problems after the EAST NBITF shuts down.

关键词：剂量率测试设备停机 NBI 放射性核素激活中性束注入器试验设施

High-Quality Single Crystalline Ge(111)Growth on Si(111)Substrates by Solid Phase Epitaxy

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2012年第3期29卷 154-156页

作者： SUN Bing CHANG hu-dong LU Li LIU Hong-Gang WU De-Xin Microwave Device and IC Department Institute of MicroelectronicsChinese Academy of SciencesBeijing 100029

Heterogeneous integration of crystalline Ge layers on cleaned and H-terminated Si(111)substrates are demonstrated by employing a combination of e-beam evaporation and solid phase epitaxy ***-quality single crystalline Ge(111)layers on Si(111)substrates with a smooth Ge surface and an abrupt interface between Ge and Si are *** XRD rocking curve scan of the Ge(111)diffraction peak shovs a FWHM of only 260 arcsec for a 50-nm-thick Ge layer annealed at 600℃with a ramp-up rate of 20℃/s and a holding time of 1 *** AFM images exhibit that the rms surface roughness of all the crystalline Ge layers are less than 2.1 nm.

关键词： crystalline Solid roughness

Radiological aspects of giant hepatocellular adenoma of the left liver: A case report

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

World Journal of Clinical Cases 2019年第23期7卷 4111-4118页

作者： Li-Ping Zheng Chun-dong hu Jing Wang Xu-Jian Chen Yi-Yu Shen Department of General Surgery The Second Affiliated Hospital of Jiaxing University

BACKGROUND Hepatocellular adenoma(HCA)is very rare and has a high misdiagnosis rate through clinical and imaging *** report a case of giant HCA of the left liver in a young woman that was diagnosed by medical imaging and *** SUMMARY A 21-year-old woman was admitted to our department for a giant hepatic tumor measuring 22 cm×20 cm×10 cm that completely replaced the left hepatic *** laboratory data only suggested mildly elevated liver function parameters and C-reactive protein levels.A computed tomography(CT)scan showed mixed density in the *** resonance imaging(MRI)of the tumor revealed a heterogeneous hypointensity on T1-weighed MR images and heterogeneous hyperintensity on T2-weighed MR *** dynamic contrast CT and MRI scans,the tumor presented marked enhancement and the subcapsular feeding arteries were clearly visible in the arterial phase,with persistent enhancement in the portal and delayed ***,the tumor capsule was especially prominent on T1-weighted MR images and showed marked enhancement in the delayed *** on these imaging manifestations,the tumor was initially considered to be an ***,the tumor was completely resected and pathologically diagnosed as an *** HCA is an extremely rare hepatic *** misdiagnoses were common not only due to the absence of special clinical manifestations and laboratory examination findings,but also due to the clinicians’lack of practical diagnostic experience and vigilance in identifying HCA on medical *** case highlights the importance of the combination of contrast-enhanced CT and MRI in the preoperative diagnosis of HCA.

关键词： Hepatocellular adenoma Computed tomography Magnetic resonance imaging Case report Differential diagnosis Pathology

Fabrication and thermal stability of Ni-P coated diamond powder using electroless plating

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

International Journal of Minerals,Metallurgy and Materials 2011年第4期18卷 479-486页

作者： Ying-hu dong Xin-bo He Ud-din Cai-yu Guo Liang Xu Yu-ting huang Xuan-hui Qu School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China School of Materials Science and Engineering Nanchang Hangkong University Nanchang 330063 China Fuel Cell Division Pakistan Institute of Nuclear Science and Technology Islamabad 44000 Pakistan

Ni-P coated diamond powder was fabricated successfully by using electroless *** of active solutions,plating time,reaction temperature,and the components of the plating bath on the Ni-P coating were investigated ***,a study on the thermal stability of Ni-P coated diamond under various atmospheres was *** results indicate that Pd atoms absorbed on the diamond surface as active sites can consequently enhance the deposition rate of Ni *** optimized plating bath and reaction conditions improve both the plating speed and the coverage rate of Ni-P electroless plating on the diamond *** to the diamond substrate,the diamond coated with Ni-P films exhibits very high thermal stability and can be processed up to 900°C in air and 1300°C in protective atmosphere such as H2.

关键词： synthetic diamonds electroless plating thermal stability particulates

Spectral properties of Pr:CNGG crystals grown by micro-pulling-down method

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2019年第8期28卷 345-348页

作者： Yan-Yan Xue Na Li dong-hua hu Qing-Song Song Xiao-dong Xu dong-Hai Wang Qing-Guo Wang dong-Zhen Li Zhan-Shan Wang Jun Xu School of Physics Science and Engineering Institute for Advanced StudyTongji UniversityShanghai 200092China Jiangsu Key Laboratory of Advanced Laser Materials and Devices School of Physics and Electronic EngineeringJiangsu Normal UniversityXuzhou 221116China

Pr^3+-doped calcium niobium gallium garnet(Pr:CNGG)single crystals with different Pr^3+concentrations are successfully grown by the micro-pulling-down(μ-PD)*** crystal structure,room-temperature absorption spectra,and fluorescence spectra of Pr:CNGG crystals are measured and *** fluorescence results indicate their large dependence on the doping *** fluorescence lifetime of the 1D2 energy level is also *** results indicate that Pr:CNGG crystal could be a potential solid-state laser gain medium.

关键词： Pr:CNGG μ-PD method spectral properties

Flexible control of semiconductor laser with frequency tunable modulation transfer spectroscopy

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2018年第7期27卷 321-324页

作者： Ning Ru Yu Wang hui-Juan Ma dong hu Li Zhang Shang-Chun Fan School of Instrumentation Science and Opto-electronics Engineering Beihang UniversityBeijing 100191China Key Laboratory for Metrology Changcheng Institute of Metrology and MeasurementBeijing 100095China

We introduce a new method of simultaneously implementing frequency stabilization and frequency shift for semiconductor lasers. We name this method the frequency tunable modulation transfer spectroscopy （FTMTS）. To realize a stable output of 780 nm semiconductor laser, an FTMTS optical heterodyne frequency stabilization system is constructed. Before entering into the frequency stabilization system, the probe laser passes through an acousto-optical modulator （AOM） twice in advance to achieve tunable frequency while keeping the light path stable. According to the experimental results, the frequency changes from 120 MHz to 190 MHz after the double-pass AOM, and the intensity of laser entering into the system is greatly changed, but there is almost no change in the error signal of the FTMTS spectrum. Using this signal to lock the laser frequency, we can ensure that the frequency of the laser changes with the amount of AOM shift. Therefore, the magneto-optical trap （MOT）-molasses process can be implemented smoothly.

关键词： semiconductor laser frequency stabilization frequency shift frequency tunable modulation trans-fer spectroscopy