检索结果-南通市图书馆

Thermal-force control ability under variation of electromagnetic stick structure parameters in RPECT

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 Iron and Steel Research International 2024年第1期31卷 224-236页

作者： Ting-song yang Wen-quan Sun Feng-shan Du An-rui He Quan yang National Engineering Research Center of Advanced Rolling and Intelligent Manufacturing University of Science and Technology BeijingBeijing100083China Institute of Engineering and Technology University of Science and Technology BeijingBeijing100083China College of Mechanical Engineering Yanshan UniversityQinhuangdao066004HebeiChina

Thermal-force driving of roll profile electromagnetic control technology(RPECT),which can be used to adjust the roll profile,can be affected by the sequential temperature rise between the electromagnetic stick(ES)and electromagnetic control *** to the limited space of ES and induction coil,the cross-sectional area of induction coil can be inevitably affected by changing the size of the ES induction zone,which can further change the energy input under the same electromagnetic parameters,the temperature rising effect and the bulging *** investigate this phenomenon,the effects of the radius of the induction zone on the thermal-force contribution ratio,the heating ability of ES and the temperature distribution were analyzed through an electromagnetic-thermal-structural finite element *** ensure that the results are applicable to RPECT,the thermal energy conversion ability and thermal-force roll crown control ability under different lengths of the induction zone were *** was found that whether the current density regulation mode or the current frequency regulation mode is adopted,the cases with 20 or 25 mm radius of the induction zone have the great thermal energy conversion ability and the good thermal-force roll crown control *** reasonable adjustment of the length of the induction zone can reduce the radius required for the maximum energy efficiency *** with the results of the simulation analysis,the optimization of ES based on the control ability maximization requirement is achieved,which provides the base for the design and configuration of ES in RPECT.

关键词： Roll profile electromagnetic control technology Electromagnetic stick Electromagnetic control roll Induction area Thermal-force driving

Consensus of Multi-agent Systems Under Switching Agent Dynamics and Jumping Network Topologies

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 Automation and computing 2016年第5期13卷 438-446页

作者： Zhen-Hong yang yang song Min Zheng Wei-Yan Hou School of Mechatronic Engineering and Automation Shanghai UniversityShanghai 200072China Shanghai Key Laboratory of Power Station Automation Technology Shanghai 200072China School of Information Zhengzhou UniversityZhengzhou 450052China

Consensus of multi-agent systems is an interesting research topic and has wide applications in science and engineering. The agents considered in most existing studies on consensus problem are time-invariant. However, in many cases, agent dynamics often show the characteristic of switching during the process of consensus. This paper considers consensus problem of general linear multi-agent system under both switching agent dynamics and jumping network topologies. Within the proposed multi-agent system, the agent dynamic switching is assumed to be deterministic, while the network topology jumping is considered respectively for two cases： deterministic jumping （Case 1） and Markov jumping （Case 2）. By applying the dwell time and the average dwell time techniques, a sufficient consensus and an almost sure consensus conditions are provided for these two cases, respectively. Finally, two numerical examples are presented to demonstrate the theoretical results.

关键词： Multi-agent systems consensus switching agent dynamics switching topologies Markov process.

Effect of Biophysical Cues on Cell Reprogramming

在线全文

学校读者我要写书评

暂无评论

医用生物力学 2019年第A01期34卷 14-15页

作者： yang song song Li Department of Bioengineering University of California

Cell reprograming technologies have broad applications in cell therapy,disease modeling and drug *** reprogramming is the process of converting from one cell type into a very distantly related cell *** this direct conversion process,cells do not proceed through a pluripotent stage,which can be time-consuming and challenging due to spontaneous *** method also offers the advantage of circumventing the teratoma potential that is associated with using *** works have demonstrated that with the use of genetic manipulation,fibroblasts can be directly converted into other cell types,including neurons,cardiomyocytes,blood cell progenitors,and *** is well known that the microenvironment can directs cell fate,and in turn cells interact with or remodel their *** evidence suggests that biophysical factors such as the microtopography and mechanical property of cell adhesive substrates regulate a variety of cellular functions such as migration,proliferation and differentiation,which in turn can modulate wound healing,tissue remodeling and tumor growth,but there are limited number of studies on the roles of biophysical cues in cell reprogramming[1].Passive topographical cues offer a simple and effective method to improve reprogramming efficiency without the need for biochemical *** previous study has demonstrated that somatic cells cultured on the parallel microgrooves,which can replace the effects of small-molecule epigenetic modifiers and significantly improve the iPSCs reprogramming *** mechanism relies on the mechanomodulation of the cells’epigenetic state,specifically,an increase of histone H3 acetylation and H3K4 methylation[2].Additionally,in cardiomyocytes reprogramming study,culturing the fibroblasts on microgrooved substrate enhances the expression of cardiomyocyte genes by day 2 and improves the yield of partially reprogrammed cells at day *** combining microgrooved substra

关键词： Effect Biophysical Cues Cell Reprogramming

Variable selection for skew-normal mixture of joint location and scale models

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics(A Journal of Chinese Universities) 2021年第4期36卷 475-491页

作者： WU Liu-cang yang song-qin TAO Ye Faculty of Science Kunming University of Science and TechnologyKunming 650093China School of Economics and Statistics Guangzhou UniversityGuangzhou 510006China

Although there are many papers on variable selection methods based on mean model in the nite mixture of regression models,little work has been done on how to select signi cant explanatory variables in the modeling of the variance *** this paper,we propose and study a novel class of models:a skew-normal mixture of joint location and scale models to analyze the heteroscedastic skew-normal data coming from a heterogeneous *** problem of variable selection for the proposed models is *** particular,a modi ed Expectation-Maximization(EM)algorithm for estimating the model parameters is *** consistency and the oracle property of the penalized estimators is *** studies are conducted to investigate the nite sample performance of the proposed *** example is illustrated by the proposed methodologies.

关键词： heterogeneous population skew-normal(SN)distribution mixture of joint location and scale models variable selection EM algorithm

Effect of Cr2O3 addition on oxidation induration and reduction swelling behavior of chromium-bearing vanadium titanomagnetite pellets with simulated coke oven gas

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2019年第8期26卷 963-972页

作者： Wei-dong Tang song-tao yang Xiang-xin Xue School of Metallurgy Northeastern UniversityShenyang 110819China School of Materials and Metallurgy University of Science and Technology LiaoningAnshan 114051China

The oxidation induration and reduction swelling behavior of chromium-bearing vanadium titanomagnetite pellets(CVTP)with Cr2O3 addition were studied,and the reduction swelling index(RSI)and compressive strength(CS)of the reduced CVTP with simulated coke oven gas(COG)injection were *** results showed that the CS of the CVTP decreases and the porosity of the CVTP increases with increasing amount of Cr2O3 *** Cr2O3 mainly exists in the form of(Cr,Fe)2O3 solid solution in the CVTP and as Fe-Cr in the reduced *** CS of the reduced CVTP increases and the RSI of the reduced CVTP decreases with increasing amount of Cr2O3 *** limited aggregation and diffusion of metallic iron contribute to the formation of dense lamellar crystals,which leads to the slight decrease for reduction swelling behavior of reduced *** work provides a theoretical and technical basis for the utilization of CVTP and other Cr-bearing ores such as chromite with COG recycling technology.

关键词： chromium oxide oxidation induration reduction swellability coke oven gas chromium-bearing vanadium titanomagnetite pellets

Air temperature feedback and its contribution to global warming

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2018年第10期61卷 1491-1509页

作者： Xiaoming HU Ming CAI song yang Sergio A.SEJAS School of Atmospheric Sciences Sun Yat-sen University Guangzhou 510275 China Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies Guangzhou 510275 China Department of Earth Ocean and Atmospheric Sciences Florida State University Tallahassee 32306 USA Institute of Earth Climate and Environment System Sun Yat-sen University Guangzhou 510275 China NASA Langley Research Center Climate Science Branch Hampton 03842 USA

Air temperature feedback results from the thermal-radiative coupling between the atmosphere and the surface and plays an important role in surface energy balance. This paper reveals the contribution of air temperature feedback to the global warming from 1980 to 2000. The air temperature feedback kernel, evaluated using the ERA-Interim reanalysis data, is used to discuss the physical mechanism for air temperature feedback, the dependency of the strength of air temperature feedback on the climatological spatial distributions of air temperature, water vapor and cloud content, and the contributions of air temperature feedback to rapid global warming. The coupling between temperature feedback and each of the external forcings and individual feedback processes will amplify the anomaly of direct energy flux convergence at the surface induced by the external forcings and individual processes. The air temperature feedback amplifies the initial surface warming due to the increase in CO2 concentration, ice and snow melting, increase in water vapor, and change in ocean heat storage. It also amplifies the surface warming due to the longwave radiaitve forcing associated with the increase in cloud cover, which acts to suppress the cooling of the shortwave effect of cloud forcing. Overall, temperature feedback plays an important role in the global warming from 1980 to2000, as the net positive contribution to the perturbation of global mean energy flux at the surface from the air temperature feedback is larger than the net negative contribution from external forcing and all non-temperature feedbacks.

关键词： Global warming Air temperature feedback Surface energy budget

Land–atmosphere–ocean coupling associated with the Tibetan Plateau and its climate impacts

在线全文

学校读者我要写书评

暂无评论

National Science Review 2020年第3期7卷 534-552页

作者： Yimin Liu Mengmeng Lu Haijun yang Anmin Duan Bian He song yang Guoxiong Wu State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric PhysicsChinese Academy of Sciences (CAS) College of Earth Science University of Chinese Academy of Sciences CAS Center for Excellence in Tibetan Plateau Earth Sciences School of Atmospheric Sciences& Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies Sun Yat-sen University Department of Earth and Planetary Sciences Harvard University Laboratory for Climate and Ocean-Atmosphere Studies (LaCOAS) and Department of Atmospheric and Oceanic Sciences School of PhysicsPeking University Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai)

This paper reviews recent advances regarding land–atmosphere–ocean coupling associated with the Tibetan Plateau(TP) and its climatic impacts. Thermal forcing over the TP interacts strongly with that over the Iranian Plateau, forming a coupled heating system that elevates the tropopause, generates a monsoonal meridional circulation over South Asia and creates conditions of large-scale ascent favorable for Asian summer monsoon development. TP heating leads to intensification and westward extension(northward movement) of the South Asian High(Atlantic Intertropical Convergence Zone), and exerts strong impacts on upstream climate variations from North Atlantic to West Asia. It also affects oceanic circulation and buoyancy fields via atmospheric stationary wave trains and air–sea interaction processes, contributing to formation of the Atlantic Meridional Overturning Circulation. The TP thermal state and atmospheric–oceanic conditions are highly interactive and Asian summer monsoon variability is controlled synergistically by internal TP variability and external forcing factors.

关键词： Tibetan and Iranian Plateau system atmospheric heat source Asian summer monsoon upstream climate Atlantic Meridional Overturning Circulation

Quantitative behavior of vibrational excitation in AC plasma assisted dry reforming of methane

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2020年第7期29卷 133-143,I0005页

作者： Jintao Sun Qi Chen Yuanwei Guo Zili Zhou yang song School of Mechanical Electronic and Control EngineeringBeijing Jiaotong UniversityBeijing 100044China

Quantitative behavior of non-equilibrium excitation by direct electron impact in low-temperature dry reforming of methane was investigated by integrated studies of experimental validation and kinetic modeling.A plasma chemistry kinetic mechanism incorporating the reactions involving vibrational excitation of CH4,CO2,H2 and CO molecules as well as the low temperature He/CH4/CO2 conversion pathways was developed and *** calculation results showed that at lower E/N values(<150 Td)large population of energized electrons generated in a He/CH4/CO2 discharge resulted in an intensification of vibrational *** the large generation of vibration,the vibrationally excited molecules in a 0.5/0.25/0.25 of He/CH4/CO2 discharge mixture were easy to relax,due to the strong coupling of the vibration of different molecules in a gas *** results showed that the moderate levels of the vibrational excitation,such as CO2(v10,11,...,18)and CO(v9,10),presented most efficient in the stimulation of species generation including CO,CH2 O,CH3 OH,C2 H4 and C2 ***,under conditions of E/N of 108 Td,14.9%of CO formation was estimated from the recombination of CO2(v)with CH3 and H,CO2(v)+CH3→CH3 O+CO,CO2(v)+H→CO+***,4.8%of C2 H4 formation was from the recombination reaction CH4(v)+CH→C2 H4+*** results highlight the strong roles of vibrational states in a complex plasma chemistry system.

关键词： Non-equilibrium plasma Dry reforming Vibrational excitation Low-temperature chemistry Plasma assisted combustion

Role of iron-based catalysts in reducing NO_(x) emissions from coal combustion

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2023年第7期59卷 1-8页

作者： Yuehua Liu Lili Chen Shoujun Liu song yang Ju Shangguan State Key Laboratory of Clean and Efficient Coal Utilization Taiyuan University of TechnologyTaiyuan 030024China Shanxi Engineering Center of Civil Clean Fuel Taiyuan University of TechnologyTaiyuan 030024China College of Chemical Engineering and Technology Taiyuan University of TechnologyTaiyuan 030024China

Nitrogen oxide(NO_(x))pollutants emitted from coal combustion are attracting growing public *** the traditional technologies of reducing NO_(x) were mainly focused on terminal treatment,and the research on source treatment is *** paper proposes a new coal combustion strategy that significantly reduces NO_(x) emissions during coal *** strategy has two important advantages in reducing NO_(x) ***,by introducing iron-based catalyst at the source,which will catalyze the conversion of coke nitrogen to volatile nitrogen during the pyrolysis process,thereby greatly reducing the coke nitrogen *** second is de-NO_(x) process by a redox reaction between NO_(x) and reducing agents(coke,HCN,NH_(3),etc.)that occurred during coke *** to direct combustion of coal,coke prepared by adding iron-based catalyst has 46.1% reduction in NO_(x) *** determine the effect of iron-based additives on de-NO_(x) performance,demineralized coal(de-coal)was prepared to eliminate the effect of iron-based minerals in coal *** effects of iron compounds,additive dosages,and combustion temperatures on de-NO_(x) efficiency are systematically *** results revealed that the NO_(x) emission of the coke generated by pyrolysis of de-coal loaded with 3%(mass)Fe_(2)O_(3) decreases to 27.3% at combustion temperature of 900℃.Two main reasons for lower NO_(x) emissions were deduced:(1)During the catalytic coal pyrolysis stage,the nitrogen content in the coke decreases with the release of volatile nitrogen.(2)Part of the NO_(x) emitted during the coke combustion was converted into N_(2) for the catalytic effect of the Fe-based *** is of great practical value and scientific significance to the comprehensive treatment and the clean utilization process of coal.

关键词： NO_(x) Coal combustion Coal pyrolysis Fe2O3 catalyst