期刊文献+
共找到21篇文章
< 1 2 >
每页显示 20 50 100
Propagation of liquid surface waves over finite graphene structured arrays of cylinders
1
作者 Xuemei Liu,1,2 Yong Wei,1 Sheng Li,1 Yousheng Xu,1,Detang Lu,3 and Boming Yu 4 1) Department of Physics,Zhejiang Normal University,Jinhua 321004,Zhejiang,China 2) Hangzhou No.14 Middle School,Hangzhou 310006,China 3) Department of Modern Mechanics,University of Science and Technology of China,Hefei 230027,China 4) School of Physics,Huazhong University of Science and Technology,Wuahn 430074,China 《Theoretical & Applied Mechanics Letters》 CAS 2011年第5期73-76,共4页
Based on the multiple scattering method,this paper investigates a benchmark problem of the propagation of liquid surface waves over finite graphene (or honeycomb) structured arrays of cylinders.Comparing the graphene ... Based on the multiple scattering method,this paper investigates a benchmark problem of the propagation of liquid surface waves over finite graphene (or honeycomb) structured arrays of cylinders.Comparing the graphene structured array with the square structured and with triangle structured arrays,it finds that the finite graphene structure can produce more complete band gaps than the other finite structures,and the finite graphene structure has less localized ability than the other finite structures. 展开更多
关键词 PROPAGATION liquid surface wave graphene structured array multiple scattering method
下载PDF
Design,preparation,application of advanced array structured materials and their action mechanism analyses for high performance lithium-sulfur batteries
2
作者 Nanping Deng Xiaofan Feng +7 位作者 Yongbing Jin Zhaozhao Peng Yang Feng Ying Tian Yong Liu Lu Gao Weimin Kang Bowen Cheng 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2024年第2期266-303,I0007,共39页
Lithium-sulfur battery(LSB)has brought much attention and concern because of high theoretical specific capacity and energy density as one of main competitors for next-generation energy storage systems.The widely comme... Lithium-sulfur battery(LSB)has brought much attention and concern because of high theoretical specific capacity and energy density as one of main competitors for next-generation energy storage systems.The widely commercial application and development of LSB is mainly hindered by serious“shuttle effect”of lithium polysulfides(Li PSs),slow reaction kinetics,notorious lithium dendrites,etc.In various structures of LSB materials,array structured materials,possessing the composition of ordered micro units with the same or similar characteristics of each unit,present excellent application potential for various secondary cells due to some merits such as immobilization of active substances,high specific surface area,appropriate pore sizes,easy modification of functional material surface,accommodated huge volume change,enough facilitated transportation for electrons/lithium ions,and special functional groups strongly adsorbing Li PSs.Thus many novel array structured materials are applied to battery for tackling thorny problems mentioned above.In this review,recent progresses and developments on array structured materials applied in LSBs including preparation ways,collaborative structural designs based on array structures,and action mechanism analyses in improving electrochemical performance and safety are summarized.Meanwhile,we also have detailed discussion for array structured materials in LSBs and constructed the structure-function relationships between array structured materials and battery performances.Lastly,some directions and prospects about preparation ways,functional modifications,and practical applications of array structured materials in LSBs are generalized.We hope the review can attract more researchers'attention and bring more studying on array structured materials for other secondary batteries including LSB. 展开更多
关键词 array structured materials Preparation methods and structural designs Action mechanism analyses Advanced Li-S batteries Excellent electrochemical performances and safety
下载PDF
Structured mirror array for two-dimensional collimation of a chromium beam in atom lithography 被引量:2
3
作者 张万经 马艳 +4 位作者 李同保 张萍萍 邓晓 陈晟 肖盛炜 《Chinese Physics B》 SCIE EI CAS CSCD 2013年第2期228-231,共4页
Direct-write atom lithography,one of the potential nanofabrication techniques,is restricted by some difficulties in producing optical masks for the deposition of complex structures.In order to make further progress,a ... Direct-write atom lithography,one of the potential nanofabrication techniques,is restricted by some difficulties in producing optical masks for the deposition of complex structures.In order to make further progress,a structured mirror array is developed to transversely collimate the chromium atomic beam in two dimensions.The best collimation is obtained when the laser red detunes by natural line-width of transition 7S3 → 7P40 of the chromium atom.The collimation ratio is 0.45 vertically(in x axis),and it is 0.55 horizontally(in y axis).The theoretical model is also simulated,and success of our structured mirror array is achieved. 展开更多
关键词 atom lithography structured mirror array laser Doppler cooling two-dimensional collimation
原文传递
A New Technology to Measure the Thermoelectric Performance of Nanowire Array Structure 被引量:1
4
作者 王为 王惠 高建平 《Transactions of Tianjin University》 EI CAS 2002年第4期243-245,共3页
Recently, the study on one-dimensional thermoelectric materials is getting more and more attention. For those one-dimensional thermoelectric materials with nanowire array structure fabricated with alumina film as temp... Recently, the study on one-dimensional thermoelectric materials is getting more and more attention. For those one-dimensional thermoelectric materials with nanowire array structure fabricated with alumina film as template, its thickness is often in the range of 10 to several tens micrometers, and the conventional measurement cannot be used. The key difficulties of the thermoelectric performance measurement for nanowire array materials include two aspects: 1) How to heat the two sides of the specimen uniformly and keep the temperature difference constantly at the same time; 2) How to measure the temperature of the two sides of the specimen with the thickness of 10 to several tens micrometers. A new type heating and temperature measuring technology has been used, and it can be simply described as liquid heating and separate temperature measurement. According to this principle, a thermoelectric performance measurement system has been established. 展开更多
关键词 measuring technology thermoelectric performance nanowire array structure thermoelectric materials
全文增补中
3D Se-doped NiCoP nanoarrays on carbon cloth for efficient alkaline hydrogen evolution 被引量:3
5
作者 LIU Zi-xuan WANG Xiao-long +3 位作者 HU Ai-ping TANG Qun-li XU Ya-li CHEN Xiao-hua 《Journal of Central South University》 SCIE EI CAS CSCD 2021年第8期2345-2359,共15页
The exploration of stable and highly efficient alkaline hydrogen evolution reaction(HER)electrocatalysts is imperative for alkaline water splitting.Herein,Se-doped NiCoP with hierarchical nanoarray structures directly... The exploration of stable and highly efficient alkaline hydrogen evolution reaction(HER)electrocatalysts is imperative for alkaline water splitting.Herein,Se-doped NiCoP with hierarchical nanoarray structures directly grown on carbon cloth(Se-NiCoP/CC)was prepared by hydrothermal reaction and phosphorization/selenization process.The experimental results reveal that Se doping could increase the electrochemical active sites and alter the electronic structure of NiCoP.The optimized Se-NiCoP/CC electrode exhibits outstanding HER activity in alkaline electrolyte,which only needs a low overpotential of 79 mV at the current density of 10 mA/cm^(2).When serving as anode and cathode electrode simultaneously,the Se-NiCoP/CC electrodes achieve current density of 50 mA/cm^(2) at a low voltage of only 1.62 V.This work provides a feasible way to rationally design high active HER electrocatalysts. 展开更多
关键词 Se-NiCoP nanorods multi-level array structure hydrogen evolution reaction alkaline solution water splitting
下载PDF
High quality-performance by changing parameters of antenna array
6
作者 XU Xue-mei WEN Jun +3 位作者 CHENG Wei SUN Ke-hui DING Yi-peng JIANG Zhao-hui 《Journal of Central South University》 SCIE EI CAS CSCD 2022年第1期146-156,共11页
Several antennas based on cylindrical array and uniform hexagonal array are designed and fabricated on flexible substrate-Teflon.To validate the designed prototypes,the antennas are fabricated and their performance is... Several antennas based on cylindrical array and uniform hexagonal array are designed and fabricated on flexible substrate-Teflon.To validate the designed prototypes,the antennas are fabricated and their performance is analyzed.The highlight scheme is to improve the signal performance and electromagnetic field distribution by appropriately changing the parameters of the antennas array,signal frequencies,and steering angles.The proposed antennas array is capable of applying shaping radiation band technique to generate tunable power and radiation domain.The distribution of the field,and the bit-error-rate transmigration coefficient characteristics are measured.The results show that the proposed scheme can achieve better performance by searching the optimal parameters of antenna array. 展开更多
关键词 array antenna structure BIT-ERROR-RATE electromagnetic beam antenna parameters high speed frequencies
下载PDF
Triboelectric nanogenerator hybrid array driven by multiform natural energies and its applications in self-powered cathodic protection
7
作者 SUN Weixiang YANG Di +2 位作者 LUO Ning LI Hao WANG DaoAi 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2024年第3期878-890,共13页
In view of the increasing energy shortage and environmental pollution, the collection of friction charges to achieve the conversion of various natural energies and provide in-situ cathodic protection for metals is a s... In view of the increasing energy shortage and environmental pollution, the collection of friction charges to achieve the conversion of various natural energies and provide in-situ cathodic protection for metals is a significant challenge. Here, we designed a dual device-structure TENG composite array with the triboelectric layer of linear siloxane-modified polyurethane(PU) coating. This array could achieve a comprehensive collection for multiple forms of nature energy and cathodic protection of metals in multi-weather conditions. For one thing, the wave-mode TENG based on tanker structure could collect wave energy and showed the output performance with a short-circuit current of 15.5 μA. For another thing, the droplet-mode TENG based on arc-shaped surface structure could collect raindrop kinetic energy and showed the output performance with a short-circuit current of 16.3 μA. Notably, the parallel array of wave-mode TENG(W-TENG) and droplet-mode TENG(D-TENG) could simultaneously collect wave energy and raindrop kinetic energy, which showed a short-circuit current of 30.7 μA. Besides, a selfpowered a cathodic protection system powered by the dual structure TENG array is assembled and the open-circuit potential drop of the carbon steel connected with the TENG array is about 450 mV. Compared with cathodic protection system powered by single structure TENG, the composite array could provide more effective corrosion resistance for marine equipment in rainy weather. Due to the characteristic for comprehensive collection of nature energy, the anti-corrosion system supplied by TENG parallel array possesses great application potential in the all-weather corrosion protection of metal machinery under complex marine conditions. 展开更多
关键词 triboelectric nanogenerator hybrid structure array siloxane-modified polyurethane cathodic protection
原文传递
High-performance sodium storage for cobalt phosphide composite array electrodes
8
作者 Man Zhang Xiao-Xu Liu +5 位作者 Tian-Yi Ji Yang Li Da-Wei Sheng Shao-Dong Li Pei-Pei Ren Ze-Xiang Shen 《Rare Metals》 SCIE EI CAS CSCD 2024年第8期3724-3734,共11页
Transition metal phosphides hold great potential as sodium-ion batteries anode materials owing to their high theoretical capacity and modest plateau.However,volume changes and low intrinsic conductivity seriously larg... Transition metal phosphides hold great potential as sodium-ion batteries anode materials owing to their high theoretical capacity and modest plateau.However,volume changes and low intrinsic conductivity seriously largely hinder the further development of metal phosphide anodes.The design of phosphide anode materials with reasonable structure is conducive to solving the problems of volume expansion and slow reaction kinetics during the reaction.In this work,a composite material integrating zeolite imidazolate backbone(ZIF) and carbon materials was synthesized by the original growth method.Furthermore,by the oxidation-phosphating process,CoP nanoarray composites riveted to carbon fiber(CoP@CF) were obtained.In the CoP@CF,CoP nanoparticles are uniformly distributed on ZIF-derived carbon,reducing agglomeration and volume change during cycling.CF also provides a highly conductive network for the active material,improving the electrode kinetics.Therefore,when evaluated as an anode for sodium-ion batteries,CoP@CF electrode displays enhanced reversible capacity(262 mAh·g^(-1) at 0.1 A·g^(-1)after 100 cycles),which is much better than that of pure CF electrode(57 mAh·g^(-1) at 0.1 A·g^(-1) after 100 cycles)prepared without the addition of CoP.The rate performance of CoP@CF electrode is also superior to that of pure CF electrode at various current densities from 0.05 to1 A·g^(-1).The sodium storage behavior of CoP@CF was revealed by ex-situ X-ray photoelectron spectroscopy,X-ray diffraction,and synchrotron radiation absorption spectroscopy.This method provides a reference for the design and synthesis of anode materials in sodium-ion batteries. 展开更多
关键词 Cobalt phosphide array structure Freestanding anodes Sodium-ion batteries
原文传递
Enhancing electrolyte ion diffusion via direct ink writing pillar array structure of graphene electrodes for high-performance microsupercapacitors
9
作者 Yan Zhang Huandi Zhang +7 位作者 Xiaoxiao Wang Cheng Tang Xiaowei Shi Zehua Zhao Jiamei Liu Guolong Wang Jianfeng Shen Lei Li 《Nano Research》 SCIE EI CSCD 2024年第7期6203-6211,共9页
The graphene-based microsupercapacitors(MSCs)suffer from graphene aggregation issue in electrodes.It reduces the electrolyte ions transportation in the electrodes to degrade the charge storage ability of MSCs,hamperin... The graphene-based microsupercapacitors(MSCs)suffer from graphene aggregation issue in electrodes.It reduces the electrolyte ions transportation in the electrodes to degrade the charge storage ability of MSCs,hampering their practical application.Increasing the electrolyte ions transportation in the electrodes can boost the charge storage ability of MSCs.Herein,we design and experimentally realize pillar array structure of graphene electrodes for MSCs by direct ink writing technology.The graphene electrodes with pillar array structure increase the contact area with electrolyte and short the electrolyte ions transport path,facilitating electrolyte ions transport in electrodes.The MSCs exhibit high areal capacitance of 25.67 mF·cm^(−2),high areal energy density of 20.54μWh·cm^(−2),and high power density of 1.45 mW·cm^(−2).One single MSCs can power timer for 10 min and pressure sensor more than 160 min,showing high practical application possibility.This work provides a new avenue for developing high performance MSCs. 展开更多
关键词 microsupercapacitors pillar array structure direct ink writing areal energy density ion transport
原文传递
Analysis of the Comprehensive Physical Field for a New Flywheel Energy Storage Motor/Generator on Ships 被引量:1
10
作者 Yali Yu Yuanxi Wang +1 位作者 Guosheng Zhang Feng Sun 《Journal of Marine Science and Application》 2012年第1期134-142,共9页
A novel flywheel energy storage (FES) motor/generator (M/G) was proposed for marine systems. The purpose was to improve the power quality of a marine power system (MPS) and strengthen the energy recycle. Two str... A novel flywheel energy storage (FES) motor/generator (M/G) was proposed for marine systems. The purpose was to improve the power quality of a marine power system (MPS) and strengthen the energy recycle. Two structures including the magnetic or non-magnetic inner-rotor were contrasted in the magnetostatic field by using finite element analysis (FEA). By optimally designing the size parameters, the average speed of FEA results of was 17 200 r/m, and the current was controlled between 62 and 68 A in the transient field. The electrical machine electromagnetism design was further optimized by the FEA in the temperature field, to find the local overheating point under the normal operation condition and provide guidance for the cooling system. Finally, it can be concluded from the comprehensive physical field analysis that the novel redundant structure M/G can improve the efficiency of the M/G and maintain the stability of the MPS. 展开更多
关键词 marine power system flywheel energy storage Halbach array magnet structure comprehensivephysical field motor/generator finite element analysis
下载PDF
Image reconstruction for brain CT slices
11
作者 吴建民 施鹏飞 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2004年第3期382-386,共5页
Different modalities in biomedical images, like CT, MRI and PET scanners, provide detailed cross-sectional views of human anatomy. This paper introduces three-dimensional brain reconstruction based on CT slices. It co... Different modalities in biomedical images, like CT, MRI and PET scanners, provide detailed cross-sectional views of human anatomy. This paper introduces three-dimensional brain reconstruction based on CT slices. It contains filtering, fuzzy segmentation, matching method of contours, cell array structure and image animation. Experimental results have shown its validity. The innovation is matching method of contours and fuzzy segmentation algorithm of CT slices. 展开更多
关键词 FILTER AFCM segmentation CONTOUR cell array structure animation.
下载PDF
Effect of One/Two-dimensional Bonding Phases on Strength and Toughness of Carbon-containing Refractories
12
作者 ZHU Boquan LI Xiangcheng +2 位作者 CHEN Ping'an WEI Guoping WANG Xuan 《China's Refractories》 CAS 2018年第3期8-20,共13页
Gaseous phases of carbon-containing and metastable oxides will be resulted from the carbonization of phenolic resin binders and the reduced reactions between C and oxides at high temperatures in carbon-containing refr... Gaseous phases of carbon-containing and metastable oxides will be resulted from the carbonization of phenolic resin binders and the reduced reactions between C and oxides at high temperatures in carbon-containing refractories. With the in-situ catalysis technique, these gaseous phases can be transformed to one-or two-dimensional bonding phases by deposition,which is favorable for the improvement on strength and toughness of carboncontaining refractories,especially low carbon refractories. The research results reveal that:( 1) the amorphous carbon resulted from phenolic resin can be transformed to carbon nanotubes,thus,the oxidation peak temperature is raised from 506 to 664. 6 ℃;( 2) onedimensional whiskers of MgO or Mg Al2 O4 can be in-situ formed in MgO-C refractories, and their CMOR,CCS,rupture displacement and residual CCS( two water quenching cycles,1 100 ℃) are increased by 66%,47%,13% and 26%,respectively;( 3) two-dimensional array structure of flake β-SiAlON can be in-situ formed in Al2 O3-C refractories,which improves the material strength by 60% and decreases the residual strength after thermal shock by only 4. 5 MPa. It is believed that the in-situ formation of one-or two-dimensional bonding phases at high temperatures can improvethe comprehensive thermal physical properties of carboncontaining refractories,and will be the developing trend of the strengthening and toughening of low carbon-containing refractories. 展开更多
关键词 carbon-containing refractories bonding phase ONE-DIMENSIONAL TWO-DIMENSIONAL array structure
下载PDF
Ultrafast laser-chemical modification hybrid fabrication of hydrostatic bearings with a superhydrophobicity solid-liquid interface
13
作者 GUO MingHui RONG YouMin +4 位作者 HUANG Yu FENG XiaoLin HU HaiDong WU CongYi ZHANG GuoJun 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2024年第3期696-708,共13页
Oil film vortex severely reduces the stability of hydrostatic bearings. A solid-liquid interface with drag and slip properties can weaken the oil film vortex of the bearing. Here, a combined picosecond laser ablation ... Oil film vortex severely reduces the stability of hydrostatic bearings. A solid-liquid interface with drag and slip properties can weaken the oil film vortex of the bearing. Here, a combined picosecond laser ablation and chemical modification method is proposed to prepare surfaces with microbulge array structure on 6061 aluminum alloy substrates. Because of the low surface energy of the perfluorododecyltriethoxysilane modification and the bulge geometry of the microbulge array structure, the surface shows excellent superhydrophobicity. The optimum contact angle in air for water is 164°, and that for oil is 139°. Two surfaces with “lotus-leaf effect” and “rose-petal effect” were obtained by controlling the processing parameters. The drag reduction properties of superhydrophobic surfaces were systematically investigated with slip lengths of 22.26 and 36.25 μm for deionized water and VG5 lubricant, respectively. In addition, the superhydrophobic surface exhibits excellent mechanical durability and thermal stability. The proposed method provides a new idea for vortex suppression in hydrostatic bearings and improves the stability of bearings in high-speed operation. 展开更多
关键词 superhydrophobicity surface ultrafast laser drag reduction solid-liquid interface microbulge array structure
原文传递
Light field head-mounted display with correct focus cue using micro structure array 被引量:4
14
作者 宋维涛 王涌天 +1 位作者 程德文 刘越 《Chinese Optics Letters》 SCIE EI CAS CSCD 2014年第6期39-42,共4页
A new type of light fiehl display is proposed using a head-mounted display (HMD) and a micro structure array (MSA, lens array or pinhole array). Each rendering point emits abundant rays from different directions i... A new type of light fiehl display is proposed using a head-mounted display (HMD) and a micro structure array (MSA, lens array or pinhole array). Each rendering point emits abundant rays from different directions into the viewer's pupil, and at one time the dense light field is generated inside the exit pupil of the HMD through the eyepiece. Therefore, the proposed method not only solves the problem of accommodation and convergence conflict in a traditional HMD, but also drastically reduces the huge data in real three-dimensional (3D) display. To demonstrate the proposed method, a prototype is developed, which is capable of giving the observer a real perception of depth. 展开更多
关键词 HMD Light field head-mounted display with correct focus cue using micro structure array MSA head
原文传递
In situ growth of NiS_(2) nanosheet array on Ni foil as cathode to improve the performance of lithium/sodium-sulfur batteries 被引量:2
15
作者 FAN MouPing CHEN YuanMao +6 位作者 KE Xi HUANG ZeXi CHEN YouChen WU WenLi QU XiaoFeng SHI ZhiCong GUO ZaiPing 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2022年第1期231-237,共7页
The NiS;nanosheet array on Ni foil(NiS2/NF)was prepared using an in situ growth strategy and sulfidation method and was used as the cathode of lithium sulfur battery.The unique nanostructure of the NiS;nanosheet array... The NiS;nanosheet array on Ni foil(NiS2/NF)was prepared using an in situ growth strategy and sulfidation method and was used as the cathode of lithium sulfur battery.The unique nanostructure of the NiS;nanosheet array can provide abundant active sites for the adsorption and chemical action of polysulfides.Compared with the sulfur powder coated pure NF(pure NF-S)for lithium sulfur battery,the sulfur powder coated NiS_(2)/NF(NiS_(2)/NF-S)electrode exhibits superior electrochemical performance.Specifically,the NiS_(2)/NF-S delivered a high reversible capacity of 1007.5 m Ah g^(-1) at a current density of 0.1 C(1 C=1675 mA g^(-1))and kept 74.5% of the initial capacity at 1.0 C after 200 cycles,indicating the great promise of NiS_(2)/NF-S as the cathode of lithium sulfur battery.In addition,the NiS_(2)/NF-S electrode also showed satisfactory electrochemical performance when used as the cathode for sodium sulfur battery. 展开更多
关键词 nickel sulfides lithium sulfur battery sodium sulfur battery nanosheet array structure electrochemical performance
原文传递
Antenna Array Structures Effect on Water-Filling Capacity of Indoor NLOS MIMO Channel
16
作者 Lü Jian-gang Lü Ying-hua +2 位作者 DU Juan LI Yun-zhuang WANG Xu-ying 《The Journal of China Universities of Posts and Telecommunications》 EI CSCD 2005年第3期17-20,共4页
A 2-D Shooting and Bouncing Ray-tracing method ( SBR ) is used to analyze the different antenna array structure effect on the water-filling Capacity Complementary Cure ulative Distribution Functions ( CCDFS) of in... A 2-D Shooting and Bouncing Ray-tracing method ( SBR ) is used to analyze the different antenna array structure effect on the water-filling Capacity Complementary Cure ulative Distribution Functions ( CCDFS) of indoor Non-Lineof-Sight (NLOS) Multiple-Input Multiple-Output (MIMO) channel. The results have shown that in NLOS indoor environment different antenna array structures affect on the CCDFS differently. The CCDFS of MIMO systems with antenna spacing 5λ change slightly with antenna array structures and all approach the in independent and identically distribution ( i. i.d. ) rayl,eigh channel water-filling capacity. When antenna spacing decreased to 0.53., the capacities of MIMO systerns drop also, and change with antenna array structures greatly. The results on outage water-filling capacity also show that there exist a fixed relationship that i. i.d. rayleigh channel capacity is larger than the capacity equipped with linear antenna array which is larger than the capacity equipped with rectangular antenna array and the capacity equipped with circular antenna array. 展开更多
关键词 MIMO RAY-TRACING CCDFS antenna array structure water-filling principle
原文传递
A 100 MS/s 9 bit 0.43 mW SAR ADC with custom capacitor array
17
作者 王晶晶 冯泽民 +4 位作者 徐荣金 陈迟晓 叶凡 许俊 任俊彦 《Journal of Semiconductors》 EI CAS CSCD 2016年第5期84-89,共6页
A low power 9 bit 100 MS/s successive approximationregisteranalog-to-digitalconverter(SARADC) with custom capacitor array is presented. A brand-new 3-D MOM unit capacitor is used as the basic capacitor cell of this ... A low power 9 bit 100 MS/s successive approximationregisteranalog-to-digitalconverter(SARADC) with custom capacitor array is presented. A brand-new 3-D MOM unit capacitor is used as the basic capacitor cell of this capacitor array. The unit capacitor has a capacitance of 1 fF. Besides, the advanced capacitor array structure and switch mode decrease the power consumption a lot. To verify the effectiveness of this low power design, the 9 bit 100 MS/s SAR ADC is implemented in TSMC IP9M 65 nm LP CMOS technology. The measurement results demonstrate that this design achieves an effective number of bits (ENOB) of 7.4 bit, a signal-to-noise plus distortion ratio (SNDR) of 46.40 dB and a spurious-flee dynamic range (SFDR) of 62.31 dB at 100 MS/s with 1 MHz input. The SAR ADC core occupies an area of 0.030 mm2 and consumes 0.43 mW under a supply voltage of 1.2 V. The figure of merit (FOM) of the SAR ADC achieves 23.75 fJ/conv. 展开更多
关键词 SAR ADC low power custom metal-oxide-metal capacitor capacitor array structure
原文传递
Wide angle space laser communication receiver based on asymmetric array structure
18
作者 WANG Yuehui ZHAO Zeping +2 位作者 ZHANG Zhike LIU Haifeng LIU Jianguo 《Optoelectronics Letters》 EI 2021年第11期678-682,共5页
In this paper, an asymmetric array structure of space laser communication receiver is proposed. This structure can greatly reduce alignment requirement, and lighten the signal strength jitter caused by atmospheric tur... In this paper, an asymmetric array structure of space laser communication receiver is proposed. This structure can greatly reduce alignment requirement, and lighten the signal strength jitter caused by atmospheric turbulence. A prototype of the proposed structure is fabricated and a 2.5 Mbit/s on-off keying(OOK) modulated demonstration link over 40 m free space is built. This asymmetric array structure can effectively collect optical signal while rotating in a window angle of ±17°, and the bit error ratio(BER) keeps zero. 展开更多
关键词 Wide angle space laser communication receiver based on asymmetric array structure
原文传递
Crustal and upper mantle structure and deep tectonic genesis of large earthquakes in North China 被引量:20
19
作者 WANG ChunYong WU QingJu +2 位作者 DUAN YongHong WANG ZhiShuo LOU Hai 《Science China Earth Sciences》 SCIE EI CAS CSCD 2017年第5期821-857,共37页
From the 1960 s to 1970 s, North China has been hit by a series of large earthquakes. During the past half century,geophysicists have carried out numerous surveys of the crustal and upper mantle structure, and associa... From the 1960 s to 1970 s, North China has been hit by a series of large earthquakes. During the past half century,geophysicists have carried out numerous surveys of the crustal and upper mantle structure, and associated studies in North China.They have made significant progress on several key issues in the geosciences, such as the crustal and upper mantle structure and the seismogenic environment of strong earthquakes. Deep seismic profiling results indicate a complex tectonic setting in the strong earthquake areas of North China, where a listric normal fault and a low-angle detachment in the upper crust coexist with a high-angle deep fault passing through the lower crust to the Moho beneath the hypocenter. Seismic tomography images reveal that most of the large earthquakes occurred in the transition between the high-and low-velocity zones, and the Tangshan earthquake area is characterized by a low-velocity anomaly in the middle-lower crust. Comprehensive analysis of geophysical data identified that the deep seismogenic environment in the North China extensional tectonic region is generally characterized by a low-velocity anomalous belt beneath the hypocenter, inconsistency of the deep and shallow structures in the crust, a steep crustalal-scale fault,relative lower velocities in the uppermost mantle, and local Moho uplift, etc. This indicates that the lithospheric structure of North China has strong heterogeneities. Geologically, the North China region had been a stable craton named the North China Craton or in brief the NCC, containing crustal rocks as old as ~3.8 Ga. The present-day strong seismic activity and the lower velocity of the lower crust in the NCC are much different from typical stable cratons around the world. These findings provide significant evidence for the destruction of the NCC. Although deep seismic profiling and seismic tomography have greatly enhanced knowledge about the deep-seated structure and seismogenic environment, some fundamental issues still remain and require further work. 展开更多
关键词 North China Craton Crust and upper mantle structure Deep seismic sounding profile Deep seismic reflection profile Broadband seismic array Seismogenic environment
原文传递
High performance architecture for unified forward and inverse transform of HEVC
20
作者 Jiang Lin Wang Xingjun +2 位作者 Wu Xin Deng Junyong Huang Xingjie 《The Journal of China Universities of Posts and Telecommunications》 EI CSCD 2017年第3期16-23,共8页
High efficiency video coding (HEVC) transform algorithm for residual coding uses 2-dimensional (2D) 4 × 4 transforms with higher precision than H.264's 4 ×4 transforms, resulting in increased hardware c... High efficiency video coding (HEVC) transform algorithm for residual coding uses 2-dimensional (2D) 4 × 4 transforms with higher precision than H.264's 4 ×4 transforms, resulting in increased hardware complexity. In this paper, we present a shared architecture that can compute the 4 ~4 forward discrete cosine transform (DCT) and inverse discrete cosine transform (IDCT) of HEVC using a new mapping scheme in the video processor array structure. The architecture is implemented with only adders and shills to an area-efficient design. The proposed architecture is synthesized using ISE 14.7 and implemented using the BEE4 platform with the Virtex-6 FF1759 LX550T field programmable gate array (FPGA). The result shows that the video processor array structure achieves a maximum operation frequency of 165.2 MHz. The architecture and its implementation are presented in this paper to demonstrate its programmable and high performance. 展开更多
关键词 HEVC forward and inverse transform reconfigurable architecture video processor array structure
原文传递
上一页 1 2 下一页 到第
使用帮助 返回顶部