检索结果-南通市图书馆

Thermal Inertia of 330 MW Circulating Fluidized Bed Boiler during Load Change

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 Thermal Science 2023年第5期32卷 1771-1783页

作者： SUN Guorui WU Haowen liu Shangzhong liu Tonghua liu Jixiang YANG Hairui ZHANG man Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Department of Energy and Power EngineeringTsinghua UniversityBeijing 100084China Wuhan Yongping Science and Technology Co.Ltd. Wuhan 430000China

The operating principles of Circulating Fluidized Bed(CFB)boilers involve a significant amount of heat accumulation,which forms the thermal inertia of the boiler and hinders the improvement of its variable load response *** study aims to characterize the thermal inertia of CFB boilers by evaluating the change in the boiler's heat accumulation corresponding to the change in unit power *** thermal inertia of a 330MW CFB boiler was determined through the collection of operating data under four different operating conditions of 30%,50%,75%,and 100%*** study proposes to substitute the existing refractory material with a metal grille to reduce the thermal inertia of the *** effect of the metal grille on heat transfer was confirmed through verification on a 440 t/h CFB boiler,and its performance change and thermal inertia reduction were further *** results indicate that over 50%of the total thermal inertia of CFB boilers originates from the refractory *** use of metal grille in place of refractory material improved heat transfer in the furnace,resulting in a decrease of the furnace chamber temperature by 13℃in the 330 MW CFB *** reduction of thermal inertia by 30%-35%will facilitate faster load lifting and lowering of the boiler,fulfilling the requirement for flexible peaking.

关键词： CFB boiler refractory thermal inertia heat accumulation

Hot Working Characteristics of Corrosion-Resistant Alloys G3 and 825

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4期18卷 68-72页

作者： YU man LI Jing she TANG Hai-yan bao Yao-zong School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing 100083 China Xinxing Ductile Pipe Co Ltd Wu'an 056300 Hebei China China Iron and Steel Research Institute Group Beijing 100081 China

The G3 and 825 alloys,with excellent combination of mechanical properties and corrosion resistance,can be used in hot,and acid *** simulation tests were conducted on the alloys G3 and 825 in the THERMECMASTOR-Z simulator,at temperature between 1030 and 1300 ℃,with strain rate from 1 to 50 s-1 and strain ε=*** variations of flow stress with deformation temperature and strain rate were *** of alloy structure with hot deformation and effect of strain rate on alloy dynamic recrystallization have been studied through microstructure observation by OM,SEM and ***,hot plasticity characteristics of alloy were analyzed by temperature-reduction of area *** results showed that available hot working temperature for G3,G3-Z and 825 was 1100 to 1240 ℃,1130 to 1220 ℃ and 1050 to 1240 ℃,*** reliable information on hot working in the alloy pilot production in steelwork is given.

关键词： corrosion-resistant alloy G3 825 stress-strain curve hot plasticity

Electrochemical Assay of Effects of Organophosphate Poisoning on Acetylcholinesterase from Pheretima via 2,6-Dimethyl-p-benzoquinone

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2012年第4期28卷 600-603页

作者： WU Wu-ai LI Jun GAO bao-ping GUO man-dong Department of Chemistry Shanxi Normal UniversityLinfen 041004P.R.China Fenyang Branch ofLu Liang Institute Fenyang 032200P.R.China

Electroanalytical techniques could be a reliable and promising alternative to classical and sophisticated methods because of their simplicity（small and portable）,easy use,the ability to deliver fast response with high sensitivity and selectivity.A square wave voltammetric method was developed for the assessment of organophosphorus（OPs） compound impact on acetylcholinesterase（AChE） of Pheretima with 2,6-dimethyl-p-benzoquinone（2,6DMBQ） as a redox *** substrate of acetylthiocholine is hydrolyzed by AChE and the produced thiocholine reacts with 2,6-DMBQ to give an obvious shift of electrochemical *** reduction peak of 2,6-DMBQ is located at around 0.18 V which is far away from the oxidation potential of possible interference components often present in *** decreased rate of reduction current was related with the activity of *** inhibition of parathion-methyl on AChE was *** inhibiton rate of OPs on AChE activity increased quickly during the first 10 min inhibition,and after that the value of inhibition rate approached to be *** lost almost 29.3% of activity after 10 min incubation with 1 μg/mL parathion-methyl and 67.5% of activity with 10 μg/mL parathion-methyl,while the activity that corresponds to 40 μg/mL parathion-methyl was nearly completely inhibited（94.9%）.Compared to cyclic voltammetry and amperometry,Square wave voltammetry（SWV） method is a high sensitive electroanalysis with fast scan-rate（only several seconds for one signal value） which is useful to prevent the electrodes from possible fouling or *** method can be employed to assess the inhibition of organophosphate on AChE and investigate OPs impact on environmental animals.

关键词： 2 6-Dimethyl-p-benzoquinone Pheretima Organophosphorous compound Square wave voltammetry Acetylcholinesterase

Dynamic regulation of DNA methylation and histone modifications in response to abiotic stresses in plants

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2022年第12期64卷 2252-2274页

作者： Yutong liu Jie Wang bao liu Zheng-Yi Xu Key Laboratory of Molecular Epigenetics of the Ministry of Education(MOE) Northeast Normal UniversityChangchun 130024China

DNA methylation and histone modification are evolutionarily conserved epigenetic modifications that are crucial for the expression regulation of abiotic stress-responsive genes in *** changes in gene expression levels can result from changes in DNA methylation and histone *** the last two decades,how epigenetic machinery regulates abiotic stress responses in plants has been extensively ***,based on recent publications,we review how DNA methylation and histone modifications impact gene expression regulation in response to abiotic stresses such as drought,abscisic acid,high salt,extreme temperature,nutrient deficiency or toxicity,and ultraviolet B *** also review the roles of epigenetic mechanisms in the formation of transgenerational stress *** posit that a better understanding of the epigenetic underpinnings of abiotic stress responses in plants may facilitate the design of more stress-resistant or-resilient crops,which is essential for coping with global warming and extreme environments.

关键词： abiotic stress DNA methylation histone modification transcriptional regulation

Injectable baicalin/F127 hydrogel with antioxidant activity for enhanced wound healing

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2020年第7期31卷 1817-1821页

作者： Guiting liu Ziting bao Jun Wu Key Laboratory of Sensing Technology and Biomedical Instrument of Guangdong Province School of Biomedical Engineering.Sun Yat-sen UniversityGuangzhou 510006China Research Institute of Sun Yat-sen University in Shenzhen Shenzhen 518057China

Baicalin,extracted from traditional Chinese medicine Scutellaria baicalensis Georg,possesses multiple pharmacological activities and has great potential for chronic skin wound ***,the poor solubility and lack of suitable vehicles greatly limit its further ***,we proposed a convenient and robust strategy,employing PBS solution as solvent,to enhance the solubility of ***,we constructed injectable baicalin/F127 hydrogels to study their application in skin wound *** composition and temperature sensitivity of baicalin/Pluronic®F-127 hydrogels were confirmed by FTIR and rheological testing,*** vitro release measurement indicated that the first order model was best fitted with the release profile of baicalin from hydrogel ***,MTT assay,AO/EO staining assay as well as hemolytic activity test revealed the excellent cytocompatibility of baicalin/F127 *** activity assay demonstrated the cytoprotective activity of baicalin/F127 hydrogels against reactive oxygen species(ROS).Furthermore,the in vivo experiments exhibited the ability of baicalin/F127 hydrogel to accelerate wound *** conclusion,this novel injectable baicalin/F127 hydrogel should have bright application for chronic wound treatment.

关键词： Wound healing Hydrogel Baicalin Antioxidant Injectable

Overcoming the cellular barriers and beyond: Recent progress on cell penetrating peptide modified nanomedicine in combating physiological and pathological barriers

在线全文

学校读者我要写书评

暂无评论

Asian Journal of Pharmaceutical Sciences 2022年第4期17卷 523-543页

作者： Yingke liu Zhihe Zhao man Li State Key Laboratory of Oral Diseases National Clinical Research Center for Oral DiseasesWest China Hospital of StomatologySichuan UniversityChengdu 610041China Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry and Sichuan Province Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial TechnologyWest China School of PharmacySichuan UniversityChengdu 610041China

The complex physiological and pathological conditions form barriers against efficient drug *** penetrating peptides(CPPs),a class of short peptides which translocate drugs across cell membranes with various mechanisms,provide feasible solutions for efficient delivery of biologically active agents to circumvent biological *** years of development,the function of CPPs is beyond cell *** CPPs with bioactivity or active targeting capacity have been designed and successfully utilized in delivery of various cargoes against tumor,myocardial ischemia,ocular posterior segment disorders,*** this review,we summarize recent progress in CPP-functionalized nano-drug delivery systems to overcome the physiological and pathological barriers for the applications in cardiology,ophtalmology,mucus,neurology and cancer,*** also highlight the prospect of clinical translation of CPP-functionalized drug delivery systems in these areas.

关键词： Cell penetrating peptide Nanomedicine Physiological barriers Drug delivery system

APPROXIMATION PROBLEMS ON THE SMOOTHNESS CLASSES

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Scientia 2024年第5期44卷 1721-1734页

作者： Yongping liu man LU School of Mathematical Sciences Beijing Normal UniversityBeijing100875China

This paper investigates the relative Kolmogorov n-widths of 2π-periodic smooth classes in■.We estimate the relative widths of■and its generalized class K_(p)■(P_(r)),where K_(p)H^(ω)(Pr)is defined by a self-conjugate differential operator P_(r)(D)induced by■Also,the modulus of continuity of the r-th derivative,or r-th self-conjugate differential,does not exceed a given modulus of continuityω.Then we obtain the asymptotic results,especially for the case p=∞,1≤q≤∞.

关键词： relative width self-conjugate differential operator asymptotic estimate

Noncollinear Interaction of Guided Optical Waves and Magnetostatic Forward Volume Waves Under Inclined Bias Magnetic Field

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 1999年第4期16卷 288-289页

作者： WU bao-jian liu Gong-qiang Department of Applied Physics Shanghai Jiaotong UniversityShanghai 200240

Coupled-mode equations for Stokes and anti-Stokes interactions of guided optical waves with magnetostatic forward volume waves under inclined magnetic field are *** results indicate that,only at normal magnetization,the diffraction efficiency(DE)is equal to the mode-conversion efficiency(MCE)in magnitude;by comparison to the case of normal magnetization,the DE and the MCE can be increased greatly under appropriate inclined magnetic *** the YIG waveguide used,the DE for the Stokes interaction is much greater than that for the anti-Stokes interaction when the inclined angle|θ|<25o and the MCE is symmetrical aboutθ.For the Bi-doped YIG film,the MCE presents a rapid oscillation withθ.The obtained results tally with the experiments.

关键词： field. magnetization oscillation

Tuning of the active phase structure and hydrofining performance of alumina-supported tri-metallic WMoNi catalysts via phosphorus incorporation

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

Frontiers of Chemical Science and Engineering 2018年第1期12卷 59-69页

作者： Shufeng Shan Haiyan liu Gang Shi Xiaojun bao State Key Laboratory of Heavy Oil Processing China University of Petroleum Beijing 102249 China State Key Laboratory of Energy & Environmental Photocatalysis Fuzhou University Fuzhou 350116 China

The effects of phosphorus on the structure and hydrofining performance of tri-metallic WMoNi/Al2O3 catalysts prepared with W/Mo-based hybrid precursor nanocrystals were investigated. The incorporation of phosphorus weakened the metal-support interactions （MSIs） and facilitated the formation of more synergetic NiWMoS phases with higher stacks. Catalytic tests using a fluid catalytic cracking diesel fuel showed that the changes in the MSIs and the morphology of the active phases had a more positive effect on the hydrodenitrogenation activity than on the hydrodesulfurization activity. In contrast, when phosphorus was incorporated into a tri-metallic WMoNiP/Al2O3 catalyst prepared by a conventional incipient impregnation method, the MSIs decreased causing aggregation of the metal species which resulted in poorer hydrofining performance of the catalyst. These results show that incorporating phosphorus into a WMoNi/Al2O3 catalyst can finely tune the structure of the active phase to enhance the hydrogenation and hydrodenitrogenation activity of the resulting tri-metallic catalyst.

关键词： fluid catalytic cracking diesel hydrofining performance WMoNiP/Al2O3 synergetic effect and structure of NiWMoS phases