检索结果-南通市图书馆

Chinese Journal of Polymer Science 2015年第8期33卷 1196-1210页

作者： Shu-sheng Li Hui han 朱晓丽 Xu-bao Jiang 孔祥正 College of Chemistry and Chemical Engineering University of Jinan College of Chemistry and Chemical Engineering Shandong University

A novel and easy one-step protocol for preparation of a new porous material, polyurea （PPU）, is reported, which is accomplished through a precipitation polymerization of toluene diisocyanate （TDI） in mixed solvent of H20-acetone without need for surfactant and porogen. Effects of TDI concentration, mechanical stirring, solvent composition and TDI addition rate on PPU structure are studied. Surface morphology and pore structure of PPU are characterized by scanning electron microscopy and Hg intrusion. Chemical structure of the PPU polymer is investigated using NMR, XRD and FTIR. Mechanism of pore formation is discussed. The obtained PPU is used as adsorbent for anionic dyes adsorption investigation. Two anionic dyes, remazol brilliant blue R and acid fuchsine, are tested. The results indicate that the as-prepared PPU is of high performance in dye adsorption and recycled use. This study provided therefore a facile route to the preparation of a novel and attractive adsorbent candidate for removal of anionic dyes from wastewaters.

关键词： Precipitation polymerization Porous polyurea Toluene diisocyanate Anionic dyes adsorption.

Aging Precipitates and Strengthening Mechanism of T122 Boiler Steel

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2010年第2期17卷 67-73页

作者： bao han-sheng CHENG Shi-chang LIU Zheng-dong TAN Shu-ping Institute of Structure Materials Central Iron and Steel Research Institute Beijing 100081 China School of Astronautics Harbin Institute of Technology Harbin 150001 Heilongjiang China

T122 steel has been used to produce superheater or reheater of ultra supercritical boilers. With the help of chemical phase extraction and mierostructure characterization, the performance of aging precipitates of T122 steel, such as M23C6 carbide, Laves phase and MX phase was investigated, the strengthening mechanism of the steel was discussed, and the thermal yield stress of lath substructure, dislocations and precipitates of the steel were calculated. It was found that lath substructure and dislocations dominated the strengthening attribution and precipitation hardening went second to the strengthening attribution.

关键词： T122 heat resistant steel strengthening precipitate substructure dislocation

Hot Deformation Behaviors of S31042 Austenitic Heat-Resistant Steel

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2011年第10期18卷 54-58,79页

作者： WANG Jing-zhong LIU gheng-dong CHENG Shi-chang bao han-sheng Central Iron and Steel Research Institute Beijing 100081 China School ot Metallurgy and Engineering Xi＇ an University of Architecture and Technology Xi＇an 710055 Shaanxi China

The hot deformation behavior of S31042 austenitic heat-resistant steel was investigated over the tempera- ture range of 900--1 200 ℃ and strain rate range of 0.01--10 s- 1 using hot compression tests and the corresponding flow curves were obtained. The hot deformation activation energy of the test steel is 625 kJ/mol. The hot deformation equation and the relationship between the peak stresses, deformation temperature and strain rate were set up. The Zener-Hollomon parameter under various conditions was determined. The relation between the Zener-Hollomon parameter and the microstructure evolution of test steel was discussed. With the decrease of Zener-Hollomon param- eter, the microstructure of test steel transforms from deformation instability to dynamic recovery, partial dynamic recrystallization, full dynamic recrystallization with equiaxial structure, and finally to full dynamic recrystaUization with mixed crystal structure. The deformation condition can be adjusted easily by utilizing the Zener-Hollomon pa- rameter to obtain equiaxial microstructure.

关键词： S31042 steel hot deformation behavior Zener-Hollomon parameter microstructure

拮抗剂与微刺激方案应用于高龄预期低预后患者临床结局分析

在线全文

学校读者我要写书评

暂无评论

生殖医学杂志 2023年第2期32卷 214-219页

作者：张加盟易建平韩宝生郭畅李宜学唐山市妇幼保健院唐山063100

目的比较拮抗剂和微刺激方案应用于高龄预期低预后患者助孕结局的差异。方法回顾性分析2020年11月至2021年10月于唐山市妇幼保健院生殖医学中心行IVF/ICSI-ET的高龄预期低预后(波塞冬标准组4)患者的临床资料(共199个周期),根据促排卵方... 详细信息

目的比较拮抗剂和微刺激方案应用于高龄预期低预后患者助孕结局的差异。方法回顾性分析2020年11月至2021年10月于唐山市妇幼保健院生殖医学中心行IVF/ICSI-ET的高龄预期低预后(波塞冬标准组4)患者的临床资料(共199个周期),根据促排卵方案不同分为拮抗剂组(88个周期)和微刺激组(111个周期)。比较两组患者的一般资料、促排卵情况、实验室指标、周期取消情况和妊娠结局。结果两组患者一般资料比较均无统计学差异(P>0.05)。拮抗剂组Gn用量、HCG日E2和P水平、获卵数、2PN数、可移植胚胎数、优质胚胎数均显著高于微刺激组(P0.05)。拮抗剂组鲜胚移植周期的胚胎种植率及临床妊娠率均显著高于微刺激组(P<0.05)。结论拮抗剂方案应用于高龄预期低预后患者有更好的临床结局,是一种理想的促排卵方案。

关键词：拮抗剂方案微刺激方案波塞冬标准高龄预期低预后

Evolution of Precipitates of S31042 Heat Resistant Steel During 700℃ Aging

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2013年第10期20卷 113-121页

作者： WANG Jing-zhong LIU Zheng-dong bao han-sheng CHENG Shi-chang Xi'an University of Architecture and Technology Central Iron and Steel Research Institute

The evolution of precipitates of S31042 steel during 700 ℃ aging was investigated by using a scanning elec- tron microscope, a transmission electron microscope, and electron energy spectrum technology. The various combi nations of M23C6, MX, NbCrN, and σ and G phases in the steel were found at different aging states. In the begin ning of aging, M23C6 precipitates swiftly along the grain boundaries. When the aging time exceeds 6 000 h, precipita- ted M23C6 carbides along the grain boundaries turn to be granular. It was found that Si element segregates to grain boundaries during above process, which may enhance the granular shape of M23C6 carbides and its transformation to and G phases. When the aging time exceeds 10 000 h, various shaped a phase and granular G phase appear along the grain boundaries and there are no continuous M23C6 carbides along the grain boundaries. Meanwhile, a large quantity of granular M23C6 carbides and a minor amount of G phase precipitate near the grain boundaries. Based on the segre- gation of silicon to the grain boundaries, a precipitation evolution model during aging was concluded.

关键词： S31042 heat resistant steel aging precipitation evolution

Gas-solid Flow Characteristics in High-density CFB

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2012年第4期21卷 354-358页

作者： Xue-yao Wang bao-guo Fan sheng-dian Wang Xiang Xu Yun-han Xiao Research Center for Clean Energy and Power Chinese Academy of SciencesKey Laboratory of Advanced Energy and Power Chinese Academy of Sciences (Institute of Engineering Thermophysics) Beijing China

The gas-solid flow characteristics in the riser of a high density CFB of square (0.27 m×0.27 m×10.4 m) or circu-lar (? 0.187m×10.4 m) cross section, using Geldart B particles (quartz sand), was investigated experimentally. The influence of riser structure on the hydrodynamic behaviors of a high-density circulating fluidized bed was investigated. The solid circulation rate was up to 321 kg/(m2s) with the circular cross-section under the operating conditions of the main bed air velocity 12.1 m/s and loosen wind and back-feed wind flow 25.1 m3/h. Different operating conditions on realizing high density circulation was analyzed, while both solids circulation rate and particle holdup depended highly on operating conditions. The circulating gas-solid flow was accompanied by an evidently-dense character in the riser's bottom zone and became fully developed in the middle and upper zones.

关键词： HDCFB gas-solid flow solids circulation rate

Hot Deformation Behavior of a New 9%Cr Heat Resistant Steel G115

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2013年第9期20卷 73-79页

作者： YAN Peng LIU Zheng-dong LIU Wei bao han-sheng WENG Yu-qing Key Laboratory of Advanced Material of Ministry of Eclucation of China School of Materials Science and EngineeringTsinghua University Institute for Special Steels China Iron and Steel Research Institute

The hot deformation behavior of a new heat resistant steel Gl15 designed for 650 ℃ ultra-supercritical （USC） power plants was experimentally studied. Hot compression test was carried out in the temperature range of 900-1 200 ℃ and the strain rate range of 0.1-20 s i by using Gleeble 3800 thermal-mechanical simulator, and the corresponding flow curves were obtained. Experimental results show that the flow stress increases with the decrease of deformation temperature and the increase of strain rate. The hot deformation activation energy of G115 steel was determined to be 494 kJ/mol and the constitutive equation was also obtained. For convenience of the practical applica-tion, a good approximate equation was obtained for calculating the peak stress values of Gl15 steel under different deformation conditions. At the strain value of 0.9, natural logarithm of the critical Zener Hollomon parameter Zc of Gl15 steel was determined to be in the scope of 49.67 and 50.65, above which there will be no dynamic recrystalliza-tion （DRX）. And natural logarithm of the critical Zener-Hollomon parameter Zc of Gl15 steel was determined to be in the scopes of 45.58 and 46.27, below which full DRX may occur. Then, the status diagram of dynamic micro structures of G115 steel was established. In addition, the strain rate sensitivity of Gl15 steel is not constant during the test temperature range and it increases linearly from 900 to 1 200 ℃. Therefore, hot deformation at higher tem- peratures would obtain better workability.

关键词： heat resistant steel G115 hot deformation dynamic recrystallization constitutive equation Zener Hol-lomon parameter

Evolution behavior and mechanism of iron carbon agglomerates under simulated blast furnace smelting conditions

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2023年第9期30卷 1714-1731页

作者： Ji-wei bao Man-sheng Chu Zheng-gen Liu Wei Lv Dong han Li-feng Zhang School of Metallurgy Northeastern UniversityShenyang 110819LiaoningChina Institute for Frontier Technologies of Low-Carbon Steelmaking Northeastern UniversityShenyang 110819LiaoningChina Liaoning Province Engineering Research Center for Technologies of Low-Carbon Steelmaking Northeastern UniversityShenyang 110819LiaoningChina State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819LiaoningChina

Iron carbon agglomerates(ICA)are the composite burden for low-carbon blast furnace(BF)*** order to optimize the reactivity of ICA according to the evolution characteristics of ICA in the BF smelting process,the evolution behavior and mechanism of different reactive ICA under simulated BF smelting conditions were *** results show that the existence of more sillimanite and aluminosilicate and less active sites of metallic iron will weaken gasification reaction and carburization ability of ICA-1(containing 10%iron ore).It weakens the promoting effect of ICA-1 on the reduction,softening,and melting of ferrous burdens and the dripping of *** aluminosilicate with a high melting point decreases,the low melting point slag phase and Fe–Si alloy increase,and many active sites of metallic iron exist,which strengthen the gasification reaction and carburization ability of ICA-2(containing 30%iron ore).The promoting effect of ICA-2 on the reduction,softening,and melting of ferrous burdens and the dripping of slag-iron is significantly *** gasification reaction capacity of ICA-3(containing 35%iron ore)is reduced,and the improvement in ICA-3 on the softening–melting performance of mixed burdens is *** appropriate proportion of iron ore in ICA is about 30%.

关键词： Iron carbon agglomerate Reactivity Evolution behavior Evolution mechanism Blast furnace Softening–melting–dripping property

Discrete memristive neuron model and its interspike interval-encoded application in image encryption

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

Science China(Technological Sciences) 2021年第10期64卷 2281-2291页

作者： bao han HUA ZhongYun LIU WenBo bao BoCheng College of Automation Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China School of Computer Science and Technology Harbin Institute of TechnologyShenzhenShenzhen 518055China School of Microelectronics and Control Engineering Changzhou UniversityChangzhou 213164China

Bursting is a diverse and common phenomenon in neuronal activation patterns and it indicates that fast action voltage spiking periods are followed by resting *** interspike interval(ISI)is the time between successive action voltage spikes of neuron and it is a key indicator used to characterize the ***,a three-dimensional memristive Hindmarsh-Rose(mHR)neuron model was constructed to generate hidden chaotic ***,the properties of the discrete mHR neuron model have not been investigated,*** this article,we first construct a discrete mHR neuron model and then acquire different hidden chaotic bursting sequences under four typical sets of *** make these sequences more suitable for the application,we further encode these hidden chaotic sequences using their ISIs and the performance comparative results show that the ISI-encoded chaotic sequences have much more complex chaos properties than the original *** addition,we apply these ISI-encoded chaotic sequences to the application of image *** image encryption scheme has a symmetric key structure and contains plain-text permutation and bidirectional diffusion *** results and security analyses prove that it has excellent robustness against various possible attacks.

关键词： chaos complexity chaotic bursting sequence memristive neuron model interspike interval(ISI) image encryption

Mechanism of action of Linggui Zhugan Decoction in treating non-alcoholic fatty liver disease using untargeted metabolomics approach

在线全文

学校读者我要写书评

暂无评论

Traditional Medicine Research 2025年第2期10卷 65-76页

作者： Huan Pei Ren-Lin Li Xin-Ran Song Qian-Qian Wan Yu-Ming Wang han-Zhou Li Wei-Quan Xu Jia-bao Liao Wei-Bo Wen Jing Miao Huan-Tian Cui School of Basic Medicine Yunnan University of Chinese MedicineKunming 650599China School Clinical Medical College Yunnan University of Chinese MedicineKunming 650599China First School of Clinical Medicine Yunnan University of Chinese MedicineKunming 650599China School of Integrative Chinese and Western Medicine Tianjin University of Traditional Chinese MedicineTianjin 301617China Department of Pharmacy Tianjin Second People's HospitalTianjin 300192China

Background:Non-alcoholic fatty liver disease(NAFLD)is a liver disorder characterized by the accumulation and degeneration of fat in the liver cells,a condition that may further deteriorate and lead to cirrhosis and liver *** studies showed that metabolic dysfunction can promote NAFLD *** Zhugan Decoction(LGZGD)has therapeutic effects on *** mechanism of LGZGD still remains *** study was to examine the impact of LGZGD on the metabolic processes involved in the development of ***:A mice model of NAFLD was treated with *** therapeutic potential of LGZGD was evaluated by assessing the activity of transaminases,lipids levels of blood,and pathological changes in the liver of the mice model of ***,this study also evaluated the influence of LGZGD on liver inflammation and oxidative ***:The results of untargeted metabolomics analysis showed that LGZGD reduced the disordered lipid metabolism in NAFLD *** improved the oxidative stress and also reduced the levels of pro-inflammatory cytokines in the *** metabolomics analysis of liver samples revealed that LGZGD treatment improved metabolic disorders,including alanine,aspartate,glutamate,glycerophospholipid metabolism,and citrate *** RT-qPCR and Western blot results showed that LGZGD could regulate the expression of key enzymes in the metabolic pathway of the citrate cycle,including ATP-citrate lyase(ACLY),alanine-glyoxylate aminotransferase-2(AGXT2),phosphatidylethanolamine N-methyltransferase(PEMT),and succinate dehydrogenase(SDH).Conclusion:We found that LGZGD can treat NAFLD by reducing inflammatory responses,inhibiting oxidative stress,regulating alanine,aspartate,glutamate,and glycerophospholipid metabolism,and citrate cycle pathways.

关键词： NAFLD LGZGD untargeted metabolomics glycerophospholipid metabolism citrate cycle