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Dendrite-free all-solid-state lithium batteries with lithium phosphorous oxynitride-modified lithium metal anode and composite solid electrolytes
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作者 Chunhua Wang Guoliang Bai +2 位作者 Yifu Yang Xingjiang Liu Huixia Shao 《纳米研究:英文版》 SCIE EI CAS CSCD 2019年第1期217-223,共7页
Dendrite formation on lithium (Li) metal anode is a key issue which hinders the development of rechargeable Li battery seriously. A novel method for suppress!ng Li dendrites via using Li phosphorous oxynitride (UPON) ... Dendrite formation on lithium (Li) metal anode is a key issue which hinders the development of rechargeable Li battery seriously. A novel method for suppress!ng Li dendrites via using Li phosphorous oxynitride (UPON) modified Li anode and Li1.5Al0.5Ge1.5(PO4)3-poly(ethylene oxide)(Li bistrifluoromethane-sulfonimide)(LAGP-PEO(LiTFSI)) composite solid electrolyte in all-solid-state Li battery is proposed, and the effect of the thickness of UPON on Li anode performarice is also studied. LiPON film with a thickness of 500 nm exhibits satisfactory interface property between Li metal anode and the LAGP-PEO(LiTFSI) solid electrolyte. The LiPON film provides a uniform Li^+ flux across the interface and effectively inhibits the formation of Li dendrites in all-solid-state Li batteries. The assembled all-solid-state Li cell Li(LiPON)/LAGP-PEO(LiTFSI)/LiFePO4 delivers an initial discharge capacity of 152.4 mAh·g^-1 and exhibits good cycling stability and rate performanee at 50 ℃. 展开更多
关键词 LITHIUM metal anode LITHIUM DENDRITES Li phosphorous OXYNITRIDE (LiPON) composite solid electrolyte ALL-SOLID-STATE LITHIUM battery
王鉴《陡壑密林图》鉴考
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作者 田艺珉 《故宫博物院院刊》 CSSCI 北大核心 2019年第5期146-157,194共13页
故宫博物院藏有王鉴康熙壬寅年(1662)仿黄公望《陡壑密林图》轴。王鉴在王时敏处得以目见黄氏原件,其对临或师仿黄氏此轴至少有六次,现存世四件,为立轴三件、册页一开,各各不一。检视康熙元年王鉴《陡壑密林图》轴,与同年所作《仿宋元... 故宫博物院藏有王鉴康熙壬寅年(1662)仿黄公望《陡壑密林图》轴。王鉴在王时敏处得以目见黄氏原件,其对临或师仿黄氏此轴至少有六次,现存世四件,为立轴三件、册页一开,各各不一。检视康熙元年王鉴《陡壑密林图》轴,与同年所作《仿宋元山水》册相比,笔墨不及后者板实圆厚,非典型的王鉴笔墨特征,同时,《陡壑密林图》轴中题跋的墨色、行笔亦不如《仿宋元山水》册。作者基于这一结论,再结合王季迁原藏黄氏之《陡壑密林图》等存世作品,尝试进一步厘辨清初“四王”存世作品的真伪。 展开更多
关键词 王鉴 陡壑密林图 板实圆厚
High strength and ductility of 34CrNiMo6 steel produced by laser solid forming
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作者 Chunping Huang Xin Lin +2 位作者 Fencheng Liu Haiou Yang Weidong Huang 《材料科学技术学报:英文版》 SCIE EI CAS CSCD 2019年第2期377-387,共11页
Because of the excellent mechanical properties of 34 CrNiMo6 steel, it is widely used in high-value components. Many conventional approaches to strengthening-steels typically involve the loss of useful ductility.In th... Because of the excellent mechanical properties of 34 CrNiMo6 steel, it is widely used in high-value components. Many conventional approaches to strengthening-steels typically involve the loss of useful ductility.In this study, 34 CrNiMo6 Steel having high strength and ductility is produced by laser solid forming(LSF)with a quenching-tempering(QT) treatment. Tempering of bainite is mainly by solid phase transformation in the previous LSF layers during the LSF process. The stable microstructure of LSF consists of ferrite and fine carbides. The microstructure transfers to tempered sorbite after heat-treatment. The tensile properties of the LSF steel meet those of the wrought standard. The UTS and elongation of LSF sample at 858 MPa, 19.2%, respectively, are greater than those of the wrought. The QT treatment enhanced the ultimate tensile strength and yield strength of the LSF sample. The ultimate tensile strength, yield strength, reduction in area, and elongation of the LSF+QT sample at 980 MPa, 916 MPa, 58.9%, and 13.9%,respectively, are greater than those of the wrought standard. The yield strength of the LSF+QT sample is approximately 1.27 times that of the wrought. The LSF samples failed in a ductile fracture mode, while the LSF+QT samples showed mixed-mode failure. The defects have only a small effect on the tensile properties owing to the excellent ductility of the LSF sample. 展开更多
关键词 Laser solid FORMING High strength and DUCTILITY QUENCHING and TEMPERING STEEL Microstructure Mechanical property
ROCO:Using a Solid State Drive Cache to Improve the Performance of a Host-Aware Shingled Magnetic Recording Drive
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作者 Wen-Guo Liu Ling-Fang Zeng +1 位作者 Dan Feng Kenneth B.Kent 《计算机科学技术学报:英文版》 SCIE EI CSCD 2019年第1期61-76,共16页
Shingled magnetic recording (SMR)can effectively increase the capacity of hard disk drives (HDDs).Hostaware SMR (HA-SMR)is expected to be more popular than other SMR models because of its backward compatibility and ne... Shingled magnetic recording (SMR)can effectively increase the capacity of hard disk drives (HDDs).Hostaware SMR (HA-SMR)is expected to be more popular than other SMR models because of its backward compatibility and new SMR-specific APIs.However,an HA-SMR drive often suffers performance degradation under write-intensive workloads because of frequent non-sequential writes buffered in the disk cache.The non-sequential writes mainly come from update writes,small random writes and out-of-order writes.In this paper,we propose a hybrid storage system called ROCO which aims to use a solid state drive (SSD)cache to improve the performance of an HA-SMR drive.ROCO reorders out-of-order writes belonging to the same zone and uses the SSD cache to absorb update writes and small random writes.We also design a data replacement algorithm called CREA for the SSD cache.CREA first conducts zone-oriented hot/cold data identification to identify cold-cached zones and hot-cached zones,and then evicts data blocks belonging to colder zones with higher priorities that can be sequentially written or written through host-side read-modify-write operations.It gives the lowest priority to data blocks belonging to the hottest-cached zone that have to be non-sequentially written.Experimental results show that ROCO can effectively reduce non-sequential writes to the HA-SMR drive and improve the performance of the HA-SMR drive. 展开更多
关键词 solid state reordering zone-oriented DRIVE (SSD)cache host-aware shingled magnetic recording (HA-SMR)drive zone-oriented block hot/cold DATA identification DATA replacement algorithm
Carbon deposition in porous nickel/yttria-stabilized zirconia anode under methane atmosphere 预览
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作者 Zhi-yuan Chen Li-jun Wang +3 位作者 Xiao-jia Du Zai-hong Sun Fu-shen Li Kuo-Chih Chou 《矿物冶金与材料学报:英文版》 SCIE EI CAS CSCD 2019年第3期350-359,共10页
A commercial solid oxide fuel cell with a Ni/YSZ anode was characterized under a pure methane atmosphere. The amount of deposited carbon increased with an increase in temperature but decreased when the temperature exc... A commercial solid oxide fuel cell with a Ni/YSZ anode was characterized under a pure methane atmosphere. The amount of deposited carbon increased with an increase in temperature but decreased when the temperature exceeded 700℃. The reactivity of carbon decreased with increasing deposition temperature. Filamentous carbon was deposited from 400 to 600℃, whereas flake carbon was deposited at 700 and 800℃. With increasing temperature, the intensity ratio of the D band over the sum of the G and D bands was constant at the beginning and then decreased with the transformation of the carbon morphology. The crystallite size increased from 2.9 to 13 nm with increasing temperature. The results also indicated that the structure of the deposited carbon was better ordered with increasing deposition temperature. In comparison with pure Ni powders, the interaction between the YSZ substrate and Ni particles could not only modify the carbon deposition kinetics but also reduce the temperature effect on the structure and reactivity variation of carbon. 展开更多
关键词 solid oxide FUEL cell COKING RAMAN spectrum HYDROCARBON FUEL ANODE
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Broadband photonic structures for quantum light sources 预览
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作者 Zhe He Jiawei Yang +4 位作者 Lidan Zhou Yan Chen Tianming Zhao Ying Yu Jin Liu 《半导体学报:英文版》 EI CAS CSCD 2019年第7期55-62,共8页
Quantum light sources serve as one of the key elements in quantum photonic technologies. Such sources made from semiconductor material, e.g., quantum dots (QDs), are particularly appealing because of their great poten... Quantum light sources serve as one of the key elements in quantum photonic technologies. Such sources made from semiconductor material, e.g., quantum dots (QDs), are particularly appealing because of their great potential of scalability enabled by the modern planar nanofabrication technologies. So far, non-classic light sources based on semiconductor QDs are currently outperforming their counterparts using nonlinear optical process, for instance, parametric down conversion and four-wave mixing. To fully exploring the potential of semiconductor QDs, it is highly desirable to integrate QDs with a variety of photonic nanostructures for better device performance due to the improved light-matter interaction. Among different designs, the photonic nanostructures exhibiting broad operation spectral range is particularly interesting to overcome the QD spectral inhomogeneity and exciton fine structure splitting for the generations of single-photon and entangled photon pair respectively. In this review, we focus on recent progress on high-performance semiconductor quantum light sources that is achieved by integrating single QDs with a variety of broadband photonic nanostructures i.e. waveguide, lens and low-Q cavity. 展开更多
关键词 PHOTONIC NANOWIRE PHOTONIC crystal waveguide solid IMMERSION LENS micro-lens circular BRAGG GRATING
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Impact of municipal solid waste incineration on heavy metals in the surrounding soils by multivariate analysis and lead isotope analysis
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作者 Yang Li Hua Zhang +2 位作者 Liming Shao Xiaoli Zhou Pinjing He 《环境科学学报:英文版》 SCIE EI CAS CSCD 2019年第8期47-56,共10页
Municipal solid waste(MSW) incineration has become an important anthropogenic source of heavy metals(HMs) to the environment. However, assessing the impact of MSW incineration on HMs in the environment, especially soi... Municipal solid waste(MSW) incineration has become an important anthropogenic source of heavy metals(HMs) to the environment. However, assessing the impact of MSW incineration on HMs in the environment, especially soils, can be a challenging task because of various HM sources. To investigate the effect of MSW incineration on HMs in soils, soil samples collected at different distances from four MSW incinerators in Shanghai, China were analyzed for their contents of eight HMs(antimony, cadmium, chromium, copper,lead, mercury, nickel, and zinc) and lead(Pb) isotope ratios. Source identification and apportionment of HMs were accomplished using principal component analysis and Pb isotope analysis. Results indicated that the relatively high contents of cadmium, lead,antimony, and zinc in the soils at 250 m and 750–1250 m away from the MSW incinerators were related to MSW incineration, while the elevated contents of the other four HMs were associated with other anthropogenic activities. Based on Pb isotope analysis, the contribution ratio of MSW incineration(which had been operated for more than 14 years)to the accumulation of Pb in soil was approximately 10% on average, which was lower than coal combustion only. Incinerator emissions of Pb could have a measurable effect on the soil contamination within a limited area(≤1500 m). 展开更多
关键词 MUNICIPAL solid waste INCINERATION SOILS HEAVY metals Source identification Pb ISOTOPE ratios
Orthotopic induction of CH157MN convexity and skull base meningiomas into nude mice using stereotactic surgery and MRI characterization 预览
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作者 Francesca La Cava Alberto Fringuello Mingo +7 位作者 Pietro Irrera Aldo Di Vito Alessia Cordaro Chiara Brioschi Sonia Colombo Serra Claudia Cabella Enzo Terreno Luigi Miragoli 《动物模型与实验医学(英文)》 CSCD 2019年第1期58-63,共6页
Meningioma in vivo research is hampered by the difficulty of establishing an easy and reproducible orthotopic model able to mimic the characteristics of a human meningioma.Moreover,leptomeningeal dissemination and hig... Meningioma in vivo research is hampered by the difficulty of establishing an easy and reproducible orthotopic model able to mimic the characteristics of a human meningioma.Moreover,leptomeningeal dissemination and high mortality are often associated with such orthotopical models,making them useless for clinical translation studies.An optimized method for inducing meningiomas in nude mice at two different sites is described in this paper and the high reproducibility and low mortality of the models are demonstrated.Skull base meningiomas were induced in the auditory meatus and convexity meningiomas were induced on the brain surface of 23 and 24 nude mice,respectively.Both models led to the development of a mass easily observable by imaging methods.Dynamic contrast enhanced MRI was used as a tool to monitor and characterize the pathology onset and progression.At the end of the study,histology was performed to confirm the neoplastic origin of the diseased mass. 展开更多
关键词 animal models NEUROSCIENCE PHARMACEUTICAL development PRECLINICAL imaging solid tumors
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Glucose-derived solid acids and their stability enhancement for upgrading biodiesel via esterification
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作者 Donglei Mao Xingguang Zhang +2 位作者 Xiongfei Zhang Mingmin Jia Jianfeng Yao 《中国化学工程学报:英文版》 SCIE EI CAS CSCD 2019年第5期1067-1072,共6页
Utilization of biomass-derived materials or chemicals plays a significant role in reducing the dependence of unsustainable resources of petroleum and coal. A series of sulfonated glucose-derived solid acids(SGSAs) wer... Utilization of biomass-derived materials or chemicals plays a significant role in reducing the dependence of unsustainable resources of petroleum and coal. A series of sulfonated glucose-derived solid acids(SGSAs) were developed in this study through a one-step method. These catalysts were characterized by XRD, FT-IR, SEM,and BET to determine their physiochemical properties, and their acid content was measured by acid–base titration. The catalytic performances of SGSA catalysts were evaluated in two esterification reactions: propionic acid or oleic acid with methanol(a typical reaction to upgrade biodiesel). Conversion of oleic acid and selectivity of methyl oleate can reach as high as 93.3% and 94.7% respectively over SGSA-6, which has the highest -SO3 H density. Moreover, regeneration of spent catalysts by sulfuric acid solution can significantly enhance their stability and reusability. 展开更多
关键词 Solid ACIDS GLUCOSE ESTERIFICATION Oleic acid BIODIESEL
Service life prediction of AP/Al/HTPB solid rocket propellant with consideration of softening aging behavior
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作者 Walid M.ADEL Guozhu LIANG 《中国航空学报:英文版》 SCIE EI CAS CSCD 2019年第2期361-368,共8页
The aging behavior of softening composite solid propellant was investigated by measuring its mechanical and ballistic prosperities during prolonged storage at elevated and room temperatures. Accelerated aging was cond... The aging behavior of softening composite solid propellant was investigated by measuring its mechanical and ballistic prosperities during prolonged storage at elevated and room temperatures. Accelerated aging was conducted at 65 °C for 231 days while the normal aging was performed at 25 ± 3 °C and relative humidity less than 50% for 8 years. The mechanical properties were obtained from uniaxial tensile tests for the aged propellant specimens while the ballistic properties were determined from static firing tests of subscale motors aged for 112 days at 65 °C. The mechanical results show that the maximum tensile strength and Young’s modulus initially increase and subsequently decrease with increasing aging time, while the maximum tensile strain generally increases with increasing aging time. The ballistic properties like burning rate show a small change which cannot affect the ballistic performance. The experimental results show that the changes in the mechanical properties are significant during the aging period, but the burning rate does not undergo significant changes. From this study, it is observed that the propellant ages through a combination of reactions like post-cure, oxidative cross-linking, chain scission, and hydrolysis. The chain scission and the hydrolysis effect are the most significant process, which makes the propellant soft and extendible. The observed aging mechanism has been modeled using an exponential function with two terms which can describe the complex behavior of the aging. By applying Arrhenius equation,the activation energy values were obtained based on the propellant mechanical properties. The shelf life of this propellant formulation at 25 °C is predicted to be 13 years using the modulus as failure criteria and control parameter. 展开更多
关键词 AGING HYDROLYSIS Service LIFE SOFTENING behavior Solid PROPELLANT
Extending SSD Lifespan with Comprehensive Non-Volatile Memory-Based Write Buffers
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作者 Ziqi Fan Dongchul Park 《计算机科学技术学报:英文版》 SCIE EI CSCD 2019年第1期113-132,共20页
New non-volatile memory (NVM)technologies are expected to replace main memory DRAM (dynamic random access memory)in the near future.NAND flash technological breakthroughs have enabled wide adoption of solid state driv... New non-volatile memory (NVM)technologies are expected to replace main memory DRAM (dynamic random access memory)in the near future.NAND flash technological breakthroughs have enabled wide adoption of solid state drives (SSDs)in storage systems.However,flash-based SSDs,by nature,cannot avoid low endurance problems because each cell only allows a limited number of erasures.This can give rise to critical SSD reliability issues.Since many SSD write operations eventually cause many SSD erase operations,reducing SSD write traffic plays a crucial role in SSD reliability. This paper proposes two NVM-based buffer cache policies which can work together in different layers to maximally reduce SSD write traffic:a main memory buffer cache design named Hierarchical Adaptive Replacement Cache (H-ARC)and an internal SSD write buffer design named Write Traffic Reduction Buffer (WRB).H-ARC considers four factors (dirty,clean, recency,and frequency)to reduce write traffic and improve cache hit ratios in the host.WRB reduces block erasures and write traffic further inside an SSD by effectively exploiting temporal and spatial localities.These two comprehensive schemes significantly reduce total SSD write traffic at each different layer (i.e.,host and SSD)by up to 3x.Consequently,they help extend SSD lifespan without system performance degradation. 展开更多
关键词 BUFFER cache policy WRITE BUFFER non-volatile MEMORY solid state drive flash MEMORY
Smoothed particle hydrodynamics(SPH) for modeling fluid-structure interactions
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作者 Moubin Liu Zhilang Zhang 《中国科学:物理学、力学、天文学英文版》 SCIE EI CAS CSCD 2019年第8期1-38,共38页
Fluid-structure interaction(FSI) is a class of mechanics-related problems with mutual dependence between the fluid and structure parts and it is observable nearly everywhere,in natural phenomena to many engineering sy... Fluid-structure interaction(FSI) is a class of mechanics-related problems with mutual dependence between the fluid and structure parts and it is observable nearly everywhere,in natural phenomena to many engineering systems.The primary challenges in developing numerical models with conventional grid-based methods are the inherent nonlinearity and timedependent nature of FSI,together with possible large deformations and moving interfaces.Smoothed particle hydrodynamics(SPH) method is a truly Lagrangian and meshfree particle method that conveniently treats large deformations and naturally captures rapidly moving interfaces and free surfaces.Since its invention,the SPH method has been widely applied to study different problems in engineering and sciences,including FSI problems.This article presents a review of the recent developments in SPH based modeling techniques for solving FSI-related problems.The basic concepts of SPH along with conventional and higher order particle approximation schemes are first introduced.Then,the implementation of FSI in a pure SPH framework and the hybrid approaches of SPH with other grid-based or particle-based methods are discussed.The SPH models of FSI problems with rigid,elastic and flexible structures,with granular materials,and with extremely intensive loadings are demonstrated.Some discussions on several key techniques in SPH including the balance of accuracy,stability and efficiency,the treatment of material interface,the coupling of SPH with other methods,and the particle regularization and adaptive particle resolution are provided as concluding marks. 展开更多
关键词 smoothed PARTICLE hydrodynamics(SPH) fluid-structure interaction(FSI) COMPUTATIONAL fluid dynamics(CFD) COMPUTATIONAL solid dynamics(CSD)
Luminescent properties of Ce3+,Er3+ co-doped La3Si6N11
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作者 Yuan Xue Ronghui Liu +5 位作者 Yuanhong Liu Huibing Xu Guantong Chen Xia Zhang Wei Gao Ze Jiang 《中国稀土学报:英文版》 SCIE EI CAS CSCD 2019年第3期248-252,共5页
In order to obtain near-infrared phosphor pumped by blue chip with high luminous efficiency, a novel near-infrared phosphor Ce3+/Er3+ doped La3Si6N11 was designed and firstly prepared via conventional solid-state reac... In order to obtain near-infrared phosphor pumped by blue chip with high luminous efficiency, a novel near-infrared phosphor Ce3+/Er3+ doped La3Si6N11 was designed and firstly prepared via conventional solid-state reactions. The structure and morphology of Ce3+/Er3+ doped La3Si6N11 were investigated by X-ray diffraction(XRD) and scanning electron microscopy(SEM). Compared with Er3+ doped La3Si6N11,the emission intensity of the Ce3+, Er3+ co-doped phosphor can be increased more than 5 times.Meanwhile, the mechanism of energy transfer from Ce3+ to Er3+ is confirmed according to the excitation,emission spectra and decay lifetimes curve. Above results suggest that La3 Si6 N11:Ce3+,Er3+ is a promising near-infrared phosphor for blue pumped LEDs(light-emitting diodes). 展开更多
关键词 Solid state reaction Energy transfer NEAR-INFRARED PHOSPHOR La3Si6N11:Ce3+ ER3+ Rare earths
超薄铝型材切割机行走齿轮疲劳分析 预览
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作者 张惜君 《内燃机与配件》 2019年第12期128-130,共3页
通过Solid Works软件建立超薄铝型材切割机行走齿轮的三维模型,根据行走齿轮工作时的受力情况,在Solid Works软件的Simulation模块中对其进行静力学分析和疲劳强度分析,通过有限元计算结果分析,得出了行走齿轮的应力、位移和应变分布规... 通过Solid Works软件建立超薄铝型材切割机行走齿轮的三维模型,根据行走齿轮工作时的受力情况,在Solid Works软件的Simulation模块中对其进行静力学分析和疲劳强度分析,通过有限元计算结果分析,得出了行走齿轮的应力、位移和应变分布规律以及使用寿命情况。实践证明,采用虚拟样机技术确定的结构分析和稳定性分析准确定较高,能够有效的找出结构设计中存在的缺陷。该分析结果为超薄铝型材切割机的设计提供了理论依据,也为后续设备维护和结构优化提供了一定的技术参考。 展开更多
关键词 SOLID WORKS 行走齿轮 静力分析 疲劳分析
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Hydration Kinetics of Municipal Solid Wastes Incineration (MSWI) Fly Ash-Cement
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作者 阚黎黎 ZHANG Li SHI Huisheng 《武汉理工大学学报:材料科学英文版》 SCIE EI CAS 2019年第3期596-603,共8页
Hydration heat behavior and kinetics of blended cement containing up to 20% MSWI fly ash were investigated based on its hydration heat evolution rate measured by isothermal calorimeter. Kinetics parameters, N and K, a... Hydration heat behavior and kinetics of blended cement containing up to 20% MSWI fly ash were investigated based on its hydration heat evolution rate measured by isothermal calorimeter. Kinetics parameters, N and K, and hydration degree, Ca(OH)2 content, were also calculated and analyzed. According to the experimental results, the induction period was elongated, the second heat evolution peak was in advance, and the third hydration heat peak could be detected due to MSWI fly ash pozzolanic reaction. The hydration reaction rate was controlled by nucleation kinetics in the acceleration period and then by diffusion in the decay period, but in the deceleration period, the hydration experienced a dual controlling reaction of autocatalytic chemical reaction and diffusion. The hydration rate of blended cement was faster. Ca(OH)2 content increased before 14 days. 展开更多
关键词 MUNICIPAL solid waste INCINERATION (MSWI) FLY ASH HYDRATION heat kinetics HYDRATION degree
Electric-field-controlled superconductor-ferromagnetic insulator transition
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作者 Likuan Ma Bin Lei +11 位作者 Naizhou Wang Kaishuai Yang Dayong Liu Fanbao Meng Chao Shang Zeliang Sun Jianhua Cui Changsheng Zhu Tao Wu Zhe Sun Liangjian Zou Xianhui Chen 《科学通报:英文版》 SCIE EI CSCD 2019年第10期653-658,共6页
Superconductivity beyond electron-phonon mechanism is always twisted with magnetism. Based on a new field-effect transistor with solid ion conductor as the gate dielectric(SIC-FET), we successfully achieve an electric... Superconductivity beyond electron-phonon mechanism is always twisted with magnetism. Based on a new field-effect transistor with solid ion conductor as the gate dielectric(SIC-FET), we successfully achieve an electric-field-controlled phase transition between superconductor and ferromagnetic insulator in(Li,Fe)OHFeSe. A dome-shaped superconducting phase with optimal T_c of 43K is continuously tuned into a ferromagnetic insulating phase, which exhibits an electric-field-controlled quantum critical behavior. The origin of the ferromagnetism is ascribed to the order of the interstitial Fe ions expelled from the(Li,Fe)OH layers by gating-controlled Li injection. These surprising findings offer a unique platform to study the relationship between superconductivity and ferromagnetism in Fe-based superconductors. This work also demonstrates the superior performance of the SIC-FET in regulating physical properties of layered unconventional superconductors. 展开更多
关键词 FeSe-based SUPERCONDUCTORS FERROMAGNETIC insulator Phase transition Solid ion conductor FIELD-EFFECT TRANSISTORS (SIC-FET)
Self-ignition characteristics of the high-speed ramjet kinetic energy projectile in the launch process
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作者 Changfei ZHUO Haotian CHEN +1 位作者 Wenjin YAO Xiaoming WANG 《中国航空学报:英文版》 SCIE EI CAS CSCD 2019年第4期851-860,共10页
To research the self-ignition characteristics of high-speed ramjet kinetic energy projectile in the launch process, the self-ignition process based on the solid fuel of polyethylene was numerically simulated by using ... To research the self-ignition characteristics of high-speed ramjet kinetic energy projectile in the launch process, the self-ignition process based on the solid fuel of polyethylene was numerically simulated by using the dynamic grid technology. The effect of different muzzle velocity on the self-ignition performance, and the effect of opening the blockage at different times on the flow field stability of the combustion chamber and the flow field characteristics after the solid fuel ramjet stabilized were analyzed. The results show that the occurrence of self-ignition is not only related to the pressure, temperature in the combustion chamber, and the muzzle velocity, but also to the content of C2H4 and its degree of mixing with air in the combustion chamber. After the kinetic energy projectile gets out of the muzzle and before the blockage opens, there is oscillation occurring in the combustion chamber. The higher the muzzle velocity of the kinetic energy projectile, the more prone to the occurrence of the self-ignition and the negative effects can be avoided due to the pressure oscillation in the combustion chamber. The effect of opening the blockage at different times on the flow field stability after the self-ignition occurs in a period of time is weak. After the blockage opens, the solid fuel ramjet can reach a stable working condition quickly. 展开更多
关键词 Dynamic grid KINETIC energy projectile MUZZLE velocity SELF-IGNITION Solid fuel RAMJET
Review on fate of chlorine during thermal processing of solid wastes
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作者 Peng Lu Qunxing Huang +3 位作者 A.C.(Thanos)Bourtsalas Nickolas J.Themelis Yong Chi Jianhua Yan 《环境科学学报:英文版》 SCIE EI CAS CSCD 2019年第4期13-28,共16页
Chlorine(Cl) is extensively present in solid wastes, causing significant problems during the thermal conversion of waste to energy or fuels, by combustion, gasification or pyrolysis.This paper introduces the analytica... Chlorine(Cl) is extensively present in solid wastes, causing significant problems during the thermal conversion of waste to energy or fuels, by combustion, gasification or pyrolysis.This paper introduces the analytical methods for determining the Cl content in solid materials and presents the concentrations of Cl in various types of wastes, as reported in literature. Then, it provides a comprehensive analysis on the Cl emission behavior and Cl species formed during the thermal processing of the inorganic and organic Cl sources. The challenges resulted from the reactions between the formed Cl species and the ferrous metals, the heavy metals and the organic matters are summarized and discussed, e.g., high temperature corrosion, heavy metal evaporation and dioxin formation. The quality degradation of products(oil, char and syngas) by Cl is analyzed. Finally, the available controlling methods of Cl emission, including pre-treatment(water washing, sorting,microwave irradiation and stepwise pyrolysis) and in-furnace(absorbents, co-treatment and catalysts) methods are assessed. 展开更多
关键词 CHLORINE Solid WASTES Thermal PROCESSING EMISSION Controlling methods
Reflection and refraction of plane waves at the boundary of an elastic solid and double-porosity dual-permeability materials
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作者 M. Kumar M. S. Barak M. Kumari 《石油科学:英文版》 SCIE CAS CSCD 2019年第2期298-317,共20页
Phenomena of reflection and refraction of plane harmonic waves at a plane interface between an elastic solid and doubleporosity dual-permeability material are investigated. The elastic solid behaves non-dissipatively,... Phenomena of reflection and refraction of plane harmonic waves at a plane interface between an elastic solid and doubleporosity dual-permeability material are investigated. The elastic solid behaves non-dissipatively, while double-porosity dual-permeability materials behave dissipatively to wave propagation due to the presence of viscosity in pore fluids. All the waves(i.e., incident and reflected) in an elastic medium are considered as homogeneous(i.e., having the same directions of propagation and attenuation), while all the refracted waves in double-porosity dual-permeability materials are inhomogeneous(i.e., having different directions of propagation and attenuation). The coefficients of reflection and refraction for a given incident wave are obtained as a non-singular system of linear equations. The energy shares of reflected and refracted waves are obtained in the form of an energy matrix. A numerical example is considered to calculate the partition of incident energy among various reflected and refracted waves. The effect of incident direction on the partition of the incident energy is analyzed with a change in wave frequency, wave-induced fluid-flow, pore-fluid viscosity and double-porosity structure.It has been confirmed from numerical interpretation that during the reflection/refraction process, conservation of incident energy is obtained at each angle of incidence. 展开更多
关键词 Plane harmonic wave Double-porosity dual-permeability Reflection/refraction COEFFICIENTS Energy share Elastic solid
基于RobotStudio的陶瓷托辊轴承座自动装配生产线虚拟仿真 预览
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作者 杨立洁 宗智锟 +1 位作者 王桂梅 成树峰 《自动化与仪表》 2019年第4期65-69,共5页
该文以陶瓷托辊轴承座自动装配生产线为研究对象,介绍了一种利用SolidWorks和RobotStudio对陶瓷托辊轴承座自动装配生产线的建模及虚拟运行生产的方案。根据实际工艺流程,进行了陶瓷托辊的夹具设计与轴承座的夹具设计;创建了Smart动态... 该文以陶瓷托辊轴承座自动装配生产线为研究对象,介绍了一种利用SolidWorks和RobotStudio对陶瓷托辊轴承座自动装配生产线的建模及虚拟运行生产的方案。根据实际工艺流程,进行了陶瓷托辊的夹具设计与轴承座的夹具设计;创建了Smart动态逻辑组件,模拟PLC、机器人与轴承座压装机等设备的I/O信号的通讯;设计了陶瓷托辊上下料机器人运动轨迹,实现了机器人的离线编程与仿真调试。仿真数据表明,实时改变机器人TCP速度等参数,可得到合理的运行速度与实现节能降耗的目的。该设计方案对陶瓷托辊轴承座自动装配生产线的实现提供了设计理论依据和实验平台,降低了生产线设计、调试的成本,提高了生产效率。 展开更多
关键词 陶瓷托辊 自动装配 SOLID WORKS RobotStudio 机器人 虚拟仿真
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