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Accountable capability improvement based on interpretable capability evaluation using belief rule base
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作者 LI Xuan JIANG Jiang +2 位作者 SUN Jianbin YU Haiyue CHANG Leilei 《Journal of Systems Engineering and Electronics》 SCIE CSCD 2024年第5期1231-1244,共14页
A new approach is proposed in this study for accountable capability improvement based on interpretable capability evaluation using the belief rule base(BRB).Firstly,a capability evaluation model is constructed and opt... A new approach is proposed in this study for accountable capability improvement based on interpretable capability evaluation using the belief rule base(BRB).Firstly,a capability evaluation model is constructed and optimized.Then,the key sub-capabilities are identified by quantitatively calculating the contributions made by each sub-capability to the overall capability.Finally,the overall capability is improved by optimizing the identified key sub-capabilities.The theoretical contributions of the proposed approach are as follows.(i)An interpretable capability evaluation model is constructed by employing BRB which can provide complete access to decision-makers.(ii)Key sub-capabilities are identified according to the quantitative contribution analysis results.(iii)Accountable capability improvement is carried out by only optimizing the identified key sub-capabilities.Case study results show that“Surveillance”,“Positioning”,and“Identification”are identified as key sub-capabilities with a summed contribution of 75.55%in an analytical and deducible fashion based on the interpretable capability evaluation model.As a result,the overall capability is improved by optimizing only the identified key sub-capabilities.The overall capability can be greatly improved from 59.20%to 81.80%with a minimum cost of 397.Furthermore,this paper also investigates how optimizing the BRB with more collected data would affect the evaluation results:only optimizing“Surveillance”and“Positioning”can also improve the overall capability to 81.34%with a cost of 370,which thus validates the efficiency of the proposed approach. 展开更多
关键词 accountable capability improvement interpretable capability evaluation belief rule base(BRB).
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Optical trapping capability of tornado circular Pearcey beams
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作者 刘娜娜 唐晓莹 +1 位作者 刘舜禹 梁毅 《Chinese Physics B》 SCIE EI CAS CSCD 2024年第5期401-407,共7页
We systemically investigate optical trapping capability of a kind of tornado waves on Rayleigh particles.Such tornado waves are named as tornado circular Pearcey beams(TCPBs)and produced by combining two circular Pear... We systemically investigate optical trapping capability of a kind of tornado waves on Rayleigh particles.Such tornado waves are named as tornado circular Pearcey beams(TCPBs)and produced by combining two circular Pearcey beams with different radii.Our theoretical exploration delves into various aspects,including the propagation dynamics,energy flux,orbital angular momentum,trapping force,and torque characteristics of TCPBs.The results reveal that the orbital angular momentum,trapping force,and torque of these beams can be finely tuned through the judicious manipulation of their topological charges(l_(1)and l_(2)).Notably,we observe a precise control mechanism wherein the force diminishes with|l_(1)+l_(2)|and|l_(1)-l_(2)|,while the torque exhibits enhancement by decreasing solely with|l_(1)+l_(2)|or increasing with|l_(1)-l_(2)|.These results not only provide quantitative insights into the optical trapping performance of TCPBs but also serve as a valuable reference for the ongoing development of innovative photonic tools. 展开更多
关键词 trapping capability tornado beams autofocusing
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From Knowledge Transfer to Capability Development:The Future of PBL+CBL Teaching Method in Operating Room Nursing Education
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作者 Kun Zhu Jiao Zhou +3 位作者 Yaqing Cui Zhengyan Shi Juntao Li Jia Li 《Journal of Contemporary Educational Research》 2024年第10期185-191,共7页
Concomitant with the advancement of contemporary medical technology,the significance of perioperative nursing has been increasingly accentuated,necessitating elevated standards for the pedagogy of perioperative nursin... Concomitant with the advancement of contemporary medical technology,the significance of perioperative nursing has been increasingly accentuated,necessitating elevated standards for the pedagogy of perioperative nursing.Presently,the PBL(problem-based learning)pedagogical approach,when integrated with CBL(case-based learning),has garnered considerable interest.An extensive literature review has been conducted to analyze the application of the PBL-CBL fusion in the education of perioperative nursing.Findings indicate that this integrative teaching methodology not only enhances students’theoretical knowledge,practical competencies,and collaborative skills but also contributes to the elevation of teaching quality.In conclusion,the PBL-CBL teaching approach holds immense potential for broader application in perioperative nursing education.Nevertheless,it is imperative to continually refine this combined pedagogical strategy to further enhance the caliber of perioperative nursing instruction and to cultivate a greater number of exceptional nursing professionals in the operating room setting. 展开更多
关键词 Knowledge transfer capability development PBL+CBL teaching method Operating room nursing EDUCATION
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Banana-shaped electron acceptors with an electron-rich core fragment and 3D packing capability 被引量:4
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作者 Pengqi Li Xianyi Meng +10 位作者 Ke Jin Zhiwei Xu Jianqi Zhang Lixiu Zhang Chuang Niu Furui Tan Chenyi Yi Zuo Xiao Yaqing Feng Guan-Wu Wang Liming Ding 《Carbon Energy》 SCIE CAS CSCD 2023年第1期123-133,共11页
The emergence of Y6-type nonfullerene acceptors has greatly enhanced the power conversion efficiency(PCE)of organic solar cells(OSCs).However,which structural feature is responsible for the excellent photovoltaic perf... The emergence of Y6-type nonfullerene acceptors has greatly enhanced the power conversion efficiency(PCE)of organic solar cells(OSCs).However,which structural feature is responsible for the excellent photovoltaic performance is still under debate.In this study,two Y6-like acceptors BDOTP-1 and BDOTP-2 were designed.Different from previous Y6-type acceptors featuring an A–D–Aʹ–D–A structure,BDOTP-1,and BDOTP-2 have no electron-deficient Aʹfragment in the core unit.Instead,there is an electron-rich dibenzodioxine fragment in the core.Although this modification leads to a marked change in the molecular dipole moment,electrostatic potential,frontier orbitals,and energy levels,BDOTP acceptors retain similar three-dimensional packing capability as Y6-type acceptors due to the similar banana-shaped molecular configuration.BDOTP acceptors show good performance in OSCs.High PCEs of up to 18.51%(certified 17.9%)are achieved.This study suggests that the banana-shaped configuration instead of the A–D–Aʹ–D–A structure is likely to be the determining factor in realizing high photovoltaic performance. 展开更多
关键词 3D packing capability core fragment molecular configuration nonfullerene acceptors organic solar cells
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Experimental study of the temporary plugging capability of diverters to block hydraulic fractures in high-temperature geothermal reservoirs
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作者 Dao-Bing Wang Hao Qin +3 位作者 Yong-Liang Wang Jian-Qiao Hu Dong-Liang Sun Bo Yu 《Petroleum Science》 SCIE EI CAS CSCD 2023年第6期3687-3699,共13页
The effective plugging of artificial fractures is key to the success of temporary plugging and diverting fracturing technology,which is one of the most promising ways to improve the heat recovery efficiency of hot dry... The effective plugging of artificial fractures is key to the success of temporary plugging and diverting fracturing technology,which is one of the most promising ways to improve the heat recovery efficiency of hot dry rock.At present,how temporary plugging agents plug artificial fractures under high temperature remains unclear.In this paper,by establishing an improved experimental system for the evaluation of temporary plugging performance at high temperature,we clarified the effects of high temperature,injection rate,and fracture width on the pressure response and plugging efficiency of the fracture.The results revealed that the temporary plugging process of artificial fractures in hot dry rock can be divided into four main stages:the initial stage of temporary plugging,the bridging stage of the particles,the plugging formation stage,and the high-pressure dense plugging stage.As the temperature increases,the distribution distance of the temporary plugging agent,the number of pressure fluctuations,and the time required for crack plugging increases.Particularly,when the temperature increases by 100℃,the complete plugging time increases by 90.7%. 展开更多
关键词 High temperature Diverter material Fracture plugging capability Hydraulic fracturing Experimental study
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Sb-Cu alloy cathode with a novel lithiation mechanism of ternary intermetallic formation: Enabling high energy density and superior rate capability of liquid metal battery
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作者 Peng Chu Jie Wang +5 位作者 Hongliang Xie Qian Zhang Jiangyuan Feng Zehao Li Zhao Yang Hailei Zhao 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2023年第3期393-400,I0011,共9页
Antimony(Sb) is an attractive cathode for liquid metal batteries(LMBs) because of its high theoretical voltage and low cost.The main obstacles associated with the Sb-based cathodes are unsatisfactory energy density an... Antimony(Sb) is an attractive cathode for liquid metal batteries(LMBs) because of its high theoretical voltage and low cost.The main obstacles associated with the Sb-based cathodes are unsatisfactory energy density and poor rate-capability.Herein,we propose a novel Sb_(64)Cu_(36)cathode that effectively tackles these issues.The Sb_(64)Cu_(36)(melting point:525℃) cathode presents a novel lithiation mechanism involving sequentially the generation of Li_(2)CuSb,the formation of Li_(3)Sb,and the conversion reaction of Li_(2)CuSb to Li_(3)Sb and Cu.The generated intermetallic compounds show a unique microstructure of the upper floated Li_(2)CuSb layer and the below cross-linked structure with interpenetrated Li_(2)CuSb and Li_(3)Sb phases.Compared with Li_(3)Sb,the lower Li migration energy barrier(0.188 eV) of Li_(2)CuSb significantly facilitates the lithium diffusion across the intermediate compounds and accelerates the reaction kinetics.Consequently,the Li‖Sb_(64)Cu_(36)cell delivers a more excellent electrochemical performance(energy density:353 W h kg^(-1)at 0.4 A cm^(-2);rate capability:0.59 V at 2.0 A cm^(-2)),and a much lower energy storage cost of only 38.45 $ kW h^(-1)than other previously reported Sb-based LMBs.This work provides a novel cathode design concept for the development of high-performance LMBs in applications for large-scale energy storage. 展开更多
关键词 Liquid metal battery Energy density Rate capability Low cost Sb_(64)Cu_(36)cathode
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Process model of IT impacts on firm competitiveness based on application capability of information technology 被引量:4
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作者 王念新 仲伟俊 梅姝娥 《Journal of Southeast University(English Edition)》 EI CAS 2008年第1期114-118,共5页
To investigate the process of information technology (IT) impacts on firm competitiveness, an integrated process model of IT impacts on firm competitiveness is brought forward based on the process-oriented view, the... To investigate the process of information technology (IT) impacts on firm competitiveness, an integrated process model of IT impacts on firm competitiveness is brought forward based on the process-oriented view, the resource-based view and the complementary resource view, which is comprised of an IT conversion process, an information system (IS) adoption process, an IS use process and a competition process. The application capability of IT plays the critical role, which determines the efficiency and effectiveness of the aforementioned four processes. The process model of IT impacts on firm competitiveness can also be used to explain why, under what situations and how IT can generate positive organizational outcomes, as well as theoretical bases for further empirical study. 展开更多
关键词 application capability of IT IT business value process-oriented view process model
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Capability matchmaking of semantic web services with preconditions and effects 被引量:2
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作者 王海 李增智 范琳 《Journal of Southeast University(English Edition)》 EI CAS 2009年第4期464-467,共4页
In order to solve the problem that the current matchmaking methods for semantic web service mainly focus on the matchmaking of IO (inputs, outputs) descriptions which may result in one-sidedness, a description-logic... In order to solve the problem that the current matchmaking methods for semantic web service mainly focus on the matchmaking of IO (inputs, outputs) descriptions which may result in one-sidedness, a description-logic-based IOPE (inputs, outputs, preconditions, effects) description and matchmaking method is proposed for semantic web service. The description logic concept is used to annotate service IO and the description logic assertion is employed to describe service PE(preconditions, effects). TBox subsumption checking is used to measure the subsumption relationship between IO descriptions of service request and advertising; ABox consistency checking is used for checking the logical implication between PE descriptions of service request and advertising. Based upon the logical implication, four kinds of PE matching degrees are proposed to measure and compare the pros and cons of the results of matchmaking. They are the exact, perfect, side-effect and common match. Experiments show that the method has a higher precision rate under the same recall rate compared with the existing method. 展开更多
关键词 capability matchmaking semantic web service precondition and effect
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“消释力”诗学观考辨——济慈“Negative Capability”重译问题 被引量:2
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作者 徐玉凤 《外语研究》 CSSCI 北大核心 2017年第3期72-76,共5页
约翰·济慈提出诗学概念"Negative Capability",其汉译众多。目前存在的汉译可分为四种情形,每种译法各有其优长和可借鉴之处。本文对该概念的种种汉译予以梳理、提出重译方式,并对这一诗学观的理解进行考辨。在对各种汉... 约翰·济慈提出诗学概念"Negative Capability",其汉译众多。目前存在的汉译可分为四种情形,每种译法各有其优长和可借鉴之处。本文对该概念的种种汉译予以梳理、提出重译方式,并对这一诗学观的理解进行考辨。在对各种汉译进行分析总结的基础上,论文对济慈提出这一诗学概念的原本之意进行了解析,认为"Negative Capability"应译为"消释力",这一汉译可以更确切地反映诗人这一哲学思想的本义,也更符合汉语的表达习惯。而各种汉译在不同语境、不同时期都有其存在的意义和理论贡献。 展开更多
关键词 NEGATIVE capability 消释 济慈 消极 客体
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A Traceable Capability-based Access Control for IoT
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作者 Chao Li Fan Li +3 位作者 Cheng Huang Lihua Yin Tianjie Luo Bin Wang 《Computers, Materials & Continua》 SCIE EI 2022年第9期4967-4982,共16页
Delegation mechanism in Internet of Things(IoT)allows users to share some of their permissions with others.Cloud-based delegation solutions require that only the user who has registered in the cloud can be delegated p... Delegation mechanism in Internet of Things(IoT)allows users to share some of their permissions with others.Cloud-based delegation solutions require that only the user who has registered in the cloud can be delegated permissions.It is not convenient when a permission is delegated to a large number of temporarily users.Therefore,some works like CapBAC delegate permissions locally in an offline way.However,this is difficult to revoke and modify the offline delegated permissions.In this work,we propose a traceable capability-based access control approach(TCAC)that can revoke and modify permissions by tracking the trajectories of permissions delegation.We define a time capability tree(TCT)that can automatically extract permissions trajectories,and we also design a new capability token to improve the permission verification,revocation and modification efficiency.The experiment results show that TCAC has less token verification and revocation/modification time than those of CapBAC and xDBAuth.TCAC can discover 73.3%unvisited users in the case of delegating and accessing randomly.This provides more information about the permissions delegation relationships,and opens up new possibilities to guarantee the global security in IoT delegation system.To the best of our knowledge,TCAC is the first work to capture the unvisited permissions. 展开更多
关键词 IoT access control permission delegation delegation trajectory capability revocation capability modification
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Integrated Process Capability Analysis
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作者 Chen H T Huang M L +1 位作者 Hung Y H Chen K S 《厦门大学学报(自然科学版)》 CAS CSCD 北大核心 2002年第S1期193-,共1页
Process Capability Analysis (PCA) is a powerful too l to assess the ability of a process for manufacturing product that meets specific ations. The larger process capability index implies the higher process yield, a nd... Process Capability Analysis (PCA) is a powerful too l to assess the ability of a process for manufacturing product that meets specific ations. The larger process capability index implies the higher process yield, a nd the larger process capability index also indicates the lower process expected loss. Chen et al. (2001) has applied indices C pu, C pl, and C pk for evaluating the process capability for a multi-process product wi th smaller-the-better, larger-the-better, and nominal-the-best specificati ons respectively. However, C pk cannot reasonably reflect the process expected loss. In this paper, index C pn is selected to replace C pk. Indices C pu, C pl, and C pn are used to evalu ate the entire process capability for a multi-process product with smaller-the -better, larger-the-better, and nominal-the-best specifications respectivel y. An integrated process capability index for a multi-process product is propo sed. The relationship between process capability index and the process yield is introduced. A multi-process capability analysis chart (MPCAC), reasonably rev ealing the status of process capability for the entire product, is constructed f or practical application. An evaluating procedure of the process capability for the entire product is also provided. 展开更多
关键词 process capability indices integrated capability analysis process yield
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Accurate Calculation of Process Capability Indices Considering the Skewed Distribution
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作者 SHEN Xue-jin, ZHU Li-jin, CHEN Xiao-yang School of Electromechanical Engineering and Automation, Shanghai University, Shanghai 200072, China 《Advances in Manufacturing》 SCIE CAS 2000年第S1期130-133,共4页
Two simple, easy and correct process capability indices are presented in this paper which is based on the investigation of the actual management situation of manufacture process in the medium or small enterprise of ou... Two simple, easy and correct process capability indices are presented in this paper which is based on the investigation of the actual management situation of manufacture process in the medium or small enterprise of our country, and the applicability analysis for the evaluating methods of process capability. The coincidental degree of distribution center between the product quality and the spec tolerance is considered in the method, and the parameter of actual standard deviation is used. So the indices have higher accuracy and reflect the essential aspect of the problem. 展开更多
关键词 process capability process capability indices evaluating method
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Synthesis of spinel LiMn_(2)O_(4) microspheres with durable high rate capability 被引量:2
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作者 周玉波 邓远富 +2 位作者 袁伟豪 施志聪 陈国华 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第10期2541-2547,共7页
Spinel LiMn2O4 microspheres with durable high rate capability were synthesized by a facile route using spherical MnCO3 precursors as the self-supported templates, combined with the calcinations of LiNO3 at 700 °C... Spinel LiMn2O4 microspheres with durable high rate capability were synthesized by a facile route using spherical MnCO3 precursors as the self-supported templates, combined with the calcinations of LiNO3 at 700 °C for 8 h. The spherical MnCO3 precursors were obtained from the control of the crystallizing process of Mn2+ ions and NH4HCO3 in aqueous solution. The effects of the mole ratio of the raw materials, reaction time, and reaction temperature on the morphology and yield of the MnCO3 were investigated. The as-synthesized MnCO3 and LiMn2O4 microspheres were characterized by powder X-ray diffractometry (XRD) and scanning electron microscopy (SEM). Galvanostatic charge/discharge tests indicate that the spinel LiMn2O4 microspheres deliver a discharge capacity of 90 mA-h/g at 10C rate show good capacity retention capability (75% of their initial capacity after 800 cycles at 10C rate). The durable high rate capability suggests that the as-synthesized LiMn2O4 microspheres are promising cathode materials for high power lithium ion batteries. 展开更多
关键词 MnCO_(3)microspheres self-supported template LiMn_(2)O_(4) microspheres rate capability
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The Comparison of the Forms of Land Capability Classification of Atalay and USA in Eskişehir Province (Turkey)
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作者 Mücahit Coşkun Ayşe Nur Uzun Turan 《Journal of Geoscience and Environment Protection》 2016年第13期72-92,共21页
Turkey is an area where climate changes immediately, vegetation, or land gets different in a short distance. Geological and lithological features show diversity. Also, our country’s territorial existence and diversit... Turkey is an area where climate changes immediately, vegetation, or land gets different in a short distance. Geological and lithological features show diversity. Also, our country’s territorial existence and diversity also bring about different land use conditions. Therefore, land capability also differs from each other. Nevertheless, the classification of land capability used in Turkey is the classification of land capability for agricultural lands prepared by the United States (USA) in 1961. Due to this, [1] have made suggestion on a new classification of land capability considering our country’s geographical conditions. In this study, comparing the land capability with the classification carrying out in our country, the classification which Atalay and Gündüzo&#287lu suggested, has been aimed. Working method has been established according to regional approach and field observations have been done. In preparing the cartographical material, ArcGIS 10.3 has been used. The map of this study as a material topography, physical map, slope, aspect, the usage of the land, ground, geology, land capability, geomorphology, temperature, and precipitation has been examined, meteorological data have been appreciated. According to the findings attained, Eski&#351ehir’s map of land capability has been done through the criteria of the suggestions of Atalay and Gündüzo&#287lu. As a result, it has been understood that there is a difference between the USA land capability that applied in Eski&#351ehir and Atalay and Gündüzo&#287lu’s criteria. In the study, it is suggested to determine the land capabilities again considering the ecological conditions of Turkey. 展开更多
关键词 The USA Land capability Atalay Land capability Classification LANDUSE GEOGRAPHY Eskişehir TURKEY
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Comparison of Optimal Place and Size of TCSC and SVC for Maximum Available Transfer Capability
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作者 M. Modiri A. Gholami A. Kazemi 《Journal of Energy and Power Engineering》 2010年第3期37-45,共9页
This paper deals with power transfer capability enhancement using two common Flexible Alternating Current Transmission Systems (FACTS) devices, Thyristor Controlled Series Capacitor (TCSC) and Static Var Compensat... This paper deals with power transfer capability enhancement using two common Flexible Alternating Current Transmission Systems (FACTS) devices, Thyristor Controlled Series Capacitor (TCSC) and Static Var Compensator (SVC). For this purpose, at first the optimal place of TCSC and SVC is investigated and the optimal size is determined. At the end, a comparison is made between the two FACTS devices. For calculating Available Transfer Capability (ATC), Repeated Power-Flow (RPF) rule used, and the network limitations such as voltage, stability, thermal capacity, and power generation limits are taken into consideration. The proposed algorithm is run on a sample network. Results show effectiveness of TCSC in situations where the thermal limit is the dominant limitation of the network. In such situations, SVC is almost useless. It was also seen that under conditions of voltage limitations, both elements are helpful for the enhancement of ATC. 展开更多
关键词 Available transfer capability flexible AC transmission systems performance index transfer capability TCSC SVC
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Coexistence Theory of Slag Structure and Its Application to Calculation of Oxidizing Capability of Slag Melts 被引量:29
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作者 ZHANG Jian 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2003年第1期1-10,共10页
The coexistence theory of slag structure and it's application to calculation of the oxidizing capabilities of slag melts is described. It is shown that the law of mass action can be widely applied to the calculati... The coexistence theory of slag structure and it's application to calculation of the oxidizing capabilities of slag melts is described. It is shown that the law of mass action can be widely applied to the calculation of oxidizing capabilities of slag melts in combination with the coexistence theory of slag structure.For slag melts containing basic oxides FeO and MnO, their oxidizing capabilities can be expressed by N Fe tO =N FeO +6N Fe 2O 3 , while for slag melts containing basic oxides CaO, MgO, etc., in addition to FeO and MnO, their oxidizing capabilities can be given as N Fe tO =N FeO +6N Fe 2O 3 +8N Fe 3O 4 . 展开更多
关键词 oxidizing capability coexistence theory slag structure ACTIVITY mass action concentration
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Urban Hierarchy of Innovation Capability and Inter-city Linkages of Knowledge in Post-reform China 被引量:22
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作者 LU Lachang HUANG Ru 《Chinese Geographical Science》 SCIE CSCD 2012年第5期602-616,共15页
The 2000s has witnessed increasing interests in cities′role of innovation in the era of knowledge-based economy.Compared with substantial empirical analysis on the world city hierarchy of innovation,this paper attemp... The 2000s has witnessed increasing interests in cities′role of innovation in the era of knowledge-based economy.Compared with substantial empirical analysis on the world city hierarchy of innovation,this paper attempts to examine the national urban hierarchy of innovation capability in China,in terms of ranking systems,spatial pattern and inter-city linkages of knowledge during the post-reform period since the late 1970s.Based on quantitative analysis such as principal component factor analysis and clustering analysis,this paper identifies the five-tier hierarchy of in-novation,which is headed by Beijing and Shanghai,followed by the capital cities of each province and regional centre cities.The development of China′s urban hierarchy of innovation capability has been driven by such factors as the scale of innovation,scientific scale,innovation potential and innovation environment.The paper further investigates the inter-city linkages of knowledge measured by the number of co-authored papers among the cities.Beijing is positioned in the central position of the knowledge diffusion and knowledge cooperation innovation.More knowledge diffusion among high level cities has occurred than that among the low level cities as well as between the low level cities and high level cities,and provincial capital cities and the regional central cities. 展开更多
关键词 urban hierarchy innovation capability inter-city linkages of knowledge Chinese cities
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High pressure EIGA preparation and 3D printing capability of Ti-6Al-4V powder 被引量:17
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作者 Kuai-kuai GUO Chang-sheng LIU +2 位作者 Sui-yuan CHEN Huan-huan DONG Si-yu WANG 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2020年第1期147-159,共13页
Ti-6 Al-4 V alloy powder was processed by electrode induction melting gas atomization(EIGA)at high gas pressure(5.5-7.0 MPa).The effects of atomizing gas pressure on the powder characteristics and the microstructure,a... Ti-6 Al-4 V alloy powder was processed by electrode induction melting gas atomization(EIGA)at high gas pressure(5.5-7.0 MPa).The effects of atomizing gas pressure on the powder characteristics and the microstructure,along with the mechanical properties of the as-fabricated block by laser melting deposition(LMD),were investigated.The results indicate that the diameters of powders are distributed in a wide range of sizes from 1 to 400μm,and the median powder size(d50)decreases with increasing gas pressure.The powders with a size fraction of 100-150μm obtained at gas pressures of 6.0 and 6.5 MPa have better flowability.The oxygen content is consistent with the change trend of gas pressure within a low range of 0.06%-0.20%.Specimens fabricated by LMD are mainly composed ofα+βgrains with a fine lamellar Widmanstatten structures and have the ultimate tensile strength(UTS)and yield strength of approximately 1100 and 1000 MPa,respectively.Furthermore,the atomized powders have a favorable 3 D printing capability,and the mechanical properties of Ti-6 Al-4 V alloys manufactured by LMD typically exceed those of their cast or wrought counterparts. 展开更多
关键词 Ti-6Al-4V powder high pressure gas atomization particle size FLOWABILITY 3D printing capability
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Correlation Between Soil Water Retention Capability and Soil Salt Content 被引量:13
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作者 FENG YONGJUN YANG JINGSONG ZHENG JIUHUA 《Pedosphere》 SCIE CAS CSCD 2000年第3期275-280,共6页
The soil moisture retention capability of Chao soil and coastal saline Chao soil in Shandong and Zhejiang provinces were measured by pressure membrane method. The main factors influencing soil moisture retention capab... The soil moisture retention capability of Chao soil and coastal saline Chao soil in Shandong and Zhejiang provinces were measured by pressure membrane method. The main factors influencing soil moisture retention capability were studied by the methods of correlation and path analyses. The results indicated that < 0.02mm physical clay and soil salt content were the main factors influencing soil moisture retention capability. At soil suction of 30-50 kpa, the soil salt content would be the dominant factor. 展开更多
关键词 influencing factor physical clay soil moisture retention capability soil salt
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Comparison of the Observation Capability of an X-band Phased-array Radar with an X-band Doppler Radar and S-band Operational Radar 被引量:7
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作者 WU Chong LIU Liping 《Advances in Atmospheric Sciences》 SCIE CAS CSCD 2014年第4期814-824,共11页
An X-band phased-array meteorological radar (XPAR) was developed in China and will be installed in an airplane to observe precipitation systems for research purposes.In order to examine the observational capability ... An X-band phased-array meteorological radar (XPAR) was developed in China and will be installed in an airplane to observe precipitation systems for research purposes.In order to examine the observational capability of the XPAR and to test the operating mode and calibration before installation in the airplane,a mobile X-band Doppler radar (XDR) and XPAR were installed at the same site to observe convective precipitation events.Nearby S-band operational radar (SA) data were also collected to examine the reflectivity bias of XPAR.An algorithm for quantitative analysis of reflectivity and velocity differences and radar sensitivity of XPAR is presented.The reflectivity and velocity biases of XPAR are examined with SA and XDR.Reflectivity sensitivities,the horizontal and vertical structures of reflectivity by the three radars are compared and analyzed.The results indicated that while the XPRA with different operating modes can capture the main characteristic of 3D structures of precipitation,and the averaged reflectivity differences between XPAR and XDR,and XDR and SA,were 0.4 dB and 6.6 dB on 13 July and-4.5 dB and 5.1 dB on 2 August 2012,respectively.The minimum observed reflectivities at a range of 50 km for XPAR,XDR and SA were about 15.4 dBZ,13.5 dBZ and-3.5 dBZ,respectively.The bias of velocity between XPAR and XDR was negligible.This study provides a possible method for the quantitative comparison of the XPAR data,as well as the sensitivity of reflectivity,calibration,gain and bias introduced by pulse compression. 展开更多
关键词 X-band planar phased-array radar observational capability field experiment quantitative analysis
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