期刊文献+
共找到1,874篇文章
< 1 2 94 >
每页显示 20 50 100
Satellite and high altitude platform-based inter-vehicle communications in vast and desolate areas 被引量:1
1
作者 林元乖 王琳 沈连丰 《Journal of Southeast University(English Edition)》 EI CAS 2012年第2期135-139,共5页
In order to solve the problem of inter-vehicle communication (IVC) in vast and desolate areas such as the desert and the Gobi, two vehicle network models are proposed. One is based on satellite communication and the... In order to solve the problem of inter-vehicle communication (IVC) in vast and desolate areas such as the desert and the Gobi, two vehicle network models are proposed. One is based on satellite communication and the other is based on high altitude platform ( HAP ) communication. The system outline and networking modes of the two models are described. In the satellite communication based model, all the vehicles are equipped with vehicle-bone satellite communication on the move terminals and the communication signals between vehicles are forwarded by satellite. In the high altitude platform-based model, the HAPs are equipped with base station facilities to form aerial base stations, and vehicles can communicate with each other via common terrestrial mobile communication devices. Some key parameters such as path loss, link loss and system capacity are also computed. The analysis shows that both the two models can satisfy the requirement of IVC in the descriptive environment. 展开更多
关键词 inter-vehicle communication satellite communication high altitude platform communication terrestrial mobile communication device system capacity
下载PDF
COOPERATIVE DIRECTIONAL INTER-CELL HANDOVER SCHEME IN HIGH ALTITUDE PLATFORM COMMUNICATIONS SYSTEMS 被引量:2
2
作者 Li Shufeng Wang Lijie +1 位作者 David Grace Ma Dongtang 《Journal of Electronics(China)》 2011年第2期249-257,共9页
A novel Cooperative Directional inter-cell Handover Scheme(CDHS) for High Altitude Platform(HAP) communications systems is proposed,in which the handover target cell and the two cells adjacent to this handover target ... A novel Cooperative Directional inter-cell Handover Scheme(CDHS) for High Altitude Platform(HAP) communications systems is proposed,in which the handover target cell and the two cells adjacent to this handover target cell work cooperatively to exploit the traffic fluctuation to improve handover performance.Users in the overlap area of the overloaded handover target cell will be forced to handover directionally before their optimal handover boundary in order to free up resources for the handover calls which would otherwise be dropped due to the shortage of resources and queue time out.Simulation results show that the handover call dropping probability is greatly reduced(at least 60%) compared with the general queue handover scheme,with little performance reduction to the call blocking probability,and the Not in the Best Cell(NBC) average time is only increased moderately.Moreover,an optimal cell radius can be achieved for a specific platform speed by minimizing the unified system performance,which is the linear combination of the handover call dropping probability and the NBC average time. 展开更多
关键词 Inter-cell Handover high Altitude platform(HAP) Dropping probability Blocking Probability
下载PDF
Statistical Modeling of the High Altitude Platform Dual-Polarized MIMO Propagation Channel 被引量:4
3
作者 Mingchuan Yang Shuo Zhang +2 位作者 Xinye Shao Qing Guo Wenyan Tang 《China Communications》 SCIE CSCD 2017年第3期43-54,共12页
In order to investigate the benefit of multiple-input multiple-output(MIMO) technique applying to the high altitude platform(HAP), a 2×2 MIMO statistical model, which can accurately describe the channel between H... In order to investigate the benefit of multiple-input multiple-output(MIMO) technique applying to the high altitude platform(HAP), a 2×2 MIMO statistical model, which can accurately describe the channel between HAP and high-speed train, is presented. And dual polarization diversity is particularly considered. Based on first-order three-state Markov chain, the single-input single-output(SISO) channel, a subset of the MIMO channel is first established. The ray tracing approach applied to the digital relief model(DRM) which covers the railway between Xi'an and Zhengzhou is used to obtain the state probability vector and matrix of the state transition probability. The proposed model considers both Doppler shift and temporal correlation, and the polarization correlation and spatial correlation statistical properties of large-scale fading and smallscale fading are analyzed. Moreover, useful numerical results on the MIMO HAP channel outage capacity are provided based on which, significant capacity gains with respect to the conventional SISO case are illustrated. Such statistical channel model can be applied to the future wireless communication system between HAP and high-speed train. 展开更多
关键词 high altitude platform(HAP) channel model multiple-input multiple-output(MIMO) polarization diversity
下载PDF
CAPACITY CALCULATION OF TD-CDMA HIGH ALTITUDE PLATFORM SYSTEM
4
作者 Wang Zhenyong Liu Xiaowei Li Zhuoshi 《Journal of Electronics(China)》 2011年第2期258-263,共6页
A capacity calculation method of High Altitude Platform System(HAPS) is proposed in which TD-CDMA multiple access schemes are applied.With the influence of both power limit and bandwidth limit on capacity integrated,t... A capacity calculation method of High Altitude Platform System(HAPS) is proposed in which TD-CDMA multiple access schemes are applied.With the influence of both power limit and bandwidth limit on capacity integrated,the paper derives the equations by which the capacity of TD-CDMA systems can be calculated,and performs calculation on a practical system.This calculation method is quite simple and effective with a comparatively small error,which is essential to the de-signing and research on HAPS. 展开更多
关键词 high Altitude platform System(HAPS) TD-CDMA Capacity calculation
下载PDF
STEERABLE ANTENNAS MOVEMENT COMPENSATION FOR HIGH ALTITUDE PLATFORM
5
作者 Wang Zhenyong Liu Xiaowei Li Zhuoshi 《Journal of Electronics(China)》 2011年第2期154-160,共7页
High Altitude Platform(HAP) must compensate for relative motion with respect to the ground because of the stratosphere complexity,which is important to guarantee Quality of Service(QoS) in intended coverage area.With ... High Altitude Platform(HAP) must compensate for relative motion with respect to the ground because of the stratosphere complexity,which is important to guarantee Quality of Service(QoS) in intended coverage area.With analysis on HAP movement models for predicting the geographical coverage in the cases of shift horizontally and vertically,yaw,roll and pitch,the mechanisms of steerable antennas movement compensation are investigated.The mechanism is applied to a scenario of 127 cell architecture,with a cell cluster size of four.By the simulation results of Carrier to Interference Ratio(CIR),the steerable antenna movement compensation mechanism decrease influence of HAP movement and guarantee effective coverage of the service area. 展开更多
关键词 high Altitude platform(HAP) Steerable antenna Movement compensation Carrier to Interference Ratio(CIR)
下载PDF
Novel high-voltage cathode for aqueous zinc ion batteries:Porous K_(0.5)VOPO_(4)·1.5H_(2)O with reversible solid-solution intercalation and conversion storage mechanism
6
作者 Liyu Wang Mingliang Zhao +9 位作者 Xiaoyu Zhang Menghua Wu Yu Zong Yu Chen Xinliang Huang Mingjie Xing Xin Ning Wen Wen Daming Zhu Xiaochuan Ren 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2024年第6期71-78,I0003,共9页
Cathode materials that possess high output voltage,as well as those that can be mass-produced using facile techniques,are crucial for the advancement of aqueous zinc-ion battery(ZIBs)applications,Herein,we present for... Cathode materials that possess high output voltage,as well as those that can be mass-produced using facile techniques,are crucial for the advancement of aqueous zinc-ion battery(ZIBs)applications,Herein,we present for the first time a new porous K_(0.5)VOPO_(4)·1.5H_(2)O polyanionic cathode(P-KIVP)with high output voltage(above 1.2 V)that can be manufactured at room temperature using straightforward coprecipitation and etching techniques.The P-KVP cathode experiences anisotropic crystal plane expansion via a sequential solid-solution intercalation and phase co nversion pathway throughout the Zn^(2+)storage process,as confirmed by in-situ synchrotron X-ray diffraction and ex-situ X-ray photoelectron spectroscopy.Similar to other layered vanadium-based polyanionic materials,the P-KVP cathode experiences a progressive decline in voltage during the cycle,which is demonstrated to be caused by the irreversible conversion into amorphous VO_(x).By introducing a new electrolyte containing Zn(OTF)_(2) to a mixed triethyl phosphate and water solution,it is possible to impede this irreversible conversion and obtain a high output voltage and longer cycle life by forming a P-rich cathode electrolyte interface layer.As a proof-of-concept,the flexible fiber-shaped ZIBs based on modified electrolyte woven into a fabric watch band can power an electronic watch,highlighting the application potential of P-KVP cathode. 展开更多
关键词 Aqueous zinc ion battery CATHODE Porous material high voltage platform In-situ synchrotron X-ray diffraction
下载PDF
Analysis of Accuracy of a High-speed Mobile Platform Control System
7
作者 RUAN Jian, YUAN Ju-long, ZHANG Li-bin, JI Shi-ming, LI Sheng (College of Mechanical & Electrical Engineering, Zhejinag University of Technology, Hangzhou 310014, China) 《厦门大学学报(自然科学版)》 CAS CSCD 北大核心 2002年第S1期38-39,共2页
The efficient manufacture technique involves a high-speed control of platform mobile system. A linear acutor is presented in this paper. The linear acutor is constructed as a linear stepper motor. However, to sustain ... The efficient manufacture technique involves a high-speed control of platform mobile system. A linear acutor is presented in this paper. The linear acutor is constructed as a linear stepper motor. However, to sustain both high accuracy and high speed for the position and speed control, A single-stack computer system is constructed and a special control algorithm is prescribed to controled the linear actuator continuously. In this paper, the nonlinear errors resulted from the magnetic saturation and the hysteresis is anaysis and discussed. In the view of electromagnetic propotional control, the actuator is a stage proportional magnet, because the driving current to the linear acuator changes for a number of cycles and a series of reset points will occur as the current undergoes cyclic changes. At each reset point the original starting characteristics of the system are re-established. A large number of reset points across the full stroke of the platform results in a significant reduction in the nonlinear behavior. The stage control is first discussed. Experiments carried out to obtain the characteristics of the mobile platform control system. It is demonstrated that with the introduction of stage control, nonlinearities, such as saturation and hysteresis, are greatly reduced, system stiffness is increased, and the positioning accuracy and resolution are improved. The effect of dither due to a "digital fragment" signal is also examined and found to be crucial in reducing the hysteresis and in improving the resolution accuracy. 展开更多
关键词 high-speed control mobile platform NONLINEARITIES
下载PDF
A High Throughput Screening Platform for Skin Tuning Properties from Natural Products: Identification of Skin Tanning Compounds
8
作者 Gallant K. L. Chan Kevin Q. Wu +5 位作者 Zack C. F. Wong Aster H. Y. Fung Xuyan Lin Lucy J. Lou Tina T. Dong Karl W. K. Tsim 《Journal of Cosmetics, Dermatological Sciences and Applications》 2016年第5期199-209,共12页
Skin lightening and tanning are two major areas dominating the market of skincare and cosmetic products. Though the demands are originated from two different communities, the two areas share a same goal—skin colour t... Skin lightening and tanning are two major areas dominating the market of skincare and cosmetic products. Though the demands are originated from two different communities, the two areas share a same goal—skin colour tuning. The known safe compounds with skin colour tuning activities are limited. In contrary, Chinese medicinal herb provides a pool of natural bioactive compounds, which have been used in Asian countries for long time and have been tested for its toxicity. Here, we demonstrate a high throughput screening platform for potential compounds usable for skin colour tuning. From 147 natural compounds, 26 of them showed potential in skin tanning functions by using the high throughput melanogenesis platform based on the melanogenesis assay on B16 melanocytes. Five of them promoted melanogenesis by over 50%. Moreover, apart from 1, 8-dihydroxyanthraquinone, the other four compounds showed enhancement effect on tyrosinase activity. From the result, the compounds increased the Vmax of tyrosinase without changing the Km in a dose-dependent manner. Thus, there should be no irreversible structural change of the enzyme. Definitely, this report contributes to the development of personalization in skincare and cosmetic products. 展开更多
关键词 Skin Lightening Skin Tanning high-Throughput platform MELANOGENESIS PERSONALIZATION Skincare and Cosmetic Products
下载PDF
Research on the cutting thermodynamic behavior of high-strength large-thickness offshore jack-up platform leg rack 被引量:1
9
作者 周宏 罗萍萍 +1 位作者 蒋志勇 张坤 《China Welding》 EI CAS 2015年第4期56-63,共8页
The cutting of offshore jack-up platform leg rack is highly nonlinear and complex thermal processing process. The residual stress influences the following welding quality and cause crack growth. Therefore, research on... The cutting of offshore jack-up platform leg rack is highly nonlinear and complex thermal processing process. The residual stress influences the following welding quality and cause crack growth. Therefore, research on the cutting practice of jack-up platform leg rack is significant to improve the safety and reliability of the offshore platform. A heating source model that is applicable to the cutting and emulation of high-strength thick plates han been presented. Then, the thermo-physical characteristic parameters of NV E690 leg plate was calculated by JMATPRO, and is revised according to the theory of metallographic. Furthermore, the numerical simulation of the linear cutting of leg plate was conducted, and the reliability of the heating source model and the thermo-physical characteristic parameters of material were proved by comparing them with the experimental data. Bused on the former study, the optimal parameter ( heating source, cutting speed and radius of the heating source model) which ensured that the gear plate was cut through without edge collapses during cutting was calculated. The optimized process parameters can be used to study the distribution of residual stress in gear plate during cutting which provides theoretical guideline for improving the construction technology of offshore platform legs. 展开更多
关键词 offshore platform pile leg rack oxygen cutting high-temperature physical performance
下载PDF
Propagation Modeling and Characteristic Analysis of Terahertz Waves via High Altitude Platforms
10
作者 Cao Xiangchun Hao Jianhong Fan Jieqing 《China Communications》 SCIE 2024年第12期126-138,共13页
Satellite-to-ground terahertz communication is limited by the power of signal source and antenna gain level,and has large path loss,which is difficult to implement.In this paper,a feasible scheme of satellite-to-groun... Satellite-to-ground terahertz communication is limited by the power of signal source and antenna gain level,and has large path loss,which is difficult to implement.In this paper,a feasible scheme of satellite-to-ground terahertz communication using High Altitude Platforms(HAPs)as relay is presented,and the path loss on terahertz communication links is modeled and analyzed.Combined with the path loss model,the transmission loss along HAP-to-ground paths under different seasons and complex weather environment in Ali,Xizang,China is calculated.The results show that the transmission characteristics of terahertz waves in winter and summer are significantly different,mainly reflected in the number and bandwidth of usable atmospheric windows.Furthermore,the additional attenuation caused by the typical sand dust and ice cloud environment on terahertz band can reach 6.1 dB and 1.9 dB at the maximum respectively.With the aid of high gain antenna,the usable communication frequencies of the HAP-to-ground links in winter are significantly more than those in summer.When the transmitting and receiving antenna gain is 40 dBi respectively,the usable communication frequency can reach 1.35 THz in winter,while it is limited to less than 1 THz in summer,up to 0.493 THz. 展开更多
关键词 atmospheric windows high Altitude platforms(HAPs) path loss terahertz(THz) wireless communication
下载PDF
Technical foundation research on high resolution remote sensing system of China's coastal zone 被引量:9
11
作者 YANGXiaomei LANRongqin +1 位作者 DUYunyan CHENXiufa 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2004年第1期109-118,共10页
China's coastal zone is a region with a highly developed economy that contrasts clearly with the slow paced regular investigation on its natural environment,which cannot keep pace with the requirement of economic ... China's coastal zone is a region with a highly developed economy that contrasts clearly with the slow paced regular investigation on its natural environment,which cannot keep pace with the requirement of economic development and modern management.Laying a theoretical foundation for the modern management of China's costal zone is aimed at. This research focuses on the following processing and analyzing technologies for coastal zone high-resolution remote sensing data: organization and management of large amounts of high-resolution remote sensing data, quick and precise spatial positioning system,algorithms for image fusion in feature level and coastal zone feature extraction. They will form a technical foundation of the system. And, if combined with other research results such as coastal zone remote sensing classification system and its mapping subsystem, an advanced technical frame for remote sensing investigation of coastal zone resource will be constructed. 展开更多
关键词 China's coastal zone high resolution remote sensing technical platform
下载PDF
Analysis of Wireless Backhaul Networks Based on Aerial Platform Technology for 6G Systems
12
作者 Sooeun Song Minsu Choi +5 位作者 Yunyeong Goh Jusik Yun Wonsuk Yoo Wonsik Yang Jaewook Jung Jong-Moon Chung 《Computers, Materials & Continua》 SCIE EI 2020年第2期473-494,共22页
As next generation communication technologies emerge,new high data rate applications and high-definition large-screen video streaming have become very popular.As a result,network traffic has been increasing so much th... As next generation communication technologies emerge,new high data rate applications and high-definition large-screen video streaming have become very popular.As a result,network traffic has been increasing so much that existing backhaul networks soon will not be able to support all traffic demands.To support these needs in future 6G mobile systems,the establishment of an additional backhaul wireless network is considered essential.As one of the solutions,a wireless backhaul network based on an aerial platform has been proposed.In order to explore the potential of aerial platforms as wireless backhaul networks,in this paper,the categories for wireless backhaul networks based on aerial platforms are investigated.This paper includes a survey of the definitions and characteristics of low altitude platforms(LAPs)and high altitude platforms(HAPs),as well as channel models according to the atmosphere.For wireless backhaul network designs based on aerial platforms,altitude and platform selection options,deployment options,energy issues,and security based on target location and performance were considered in the analysis and investigation. 展开更多
关键词 Wireless backhaul network aerial platform high altitude platform low altitude platform
下载PDF
A novel 3-D spatial temporal channel model for high mobility HAPS-based communications scenario
13
作者 杨明川 Jiang Yicheng +1 位作者 Guo Qing Li Hanqing 《High Technology Letters》 EI CAS 2009年第4期356-362,共7页
A high altitude platform station (HAPS) based communications scenario for providing Intemet access and broadband multimedia services to the passengers on board of a high speed train (traveling up to 300km/h) is pr... A high altitude platform station (HAPS) based communications scenario for providing Intemet access and broadband multimedia services to the passengers on board of a high speed train (traveling up to 300km/h) is proposed. Regarding the addressed scenario, when the propagation link between HAPS and train is blocked by obstacles, a three-dimensional (3-D) geometrical single cylinder spatial-temporal channel model is presented, in which closed form, mathematically tractable space-time correlation functions are obtained. It shows that the correlation functions determined by the 3-D model are of significant difference with those of the conventional 2-D model. Based on the analysis model, the paper derives a realized simulation model using sum-of-sinusoids approach, and applies method of equal areas (MEA) and modified method of equal areas (MMEA) to determine the model parameters. The fitting performance of the simulation model with the analysis one is evaluated by two means-square error (MSE) performance criteria. Finally, numerical simulation results verify the mathematical analysis conclusion, when N ≥21, simulation model has an excellent fitness with the analysis one. 展开更多
关键词 high mobility high altitude platform station (HAPS) channel characteristic propagation scattering theory spatial temporal channel model angle of arrival
下载PDF
Platform LSF软件在高性能计算集群中的实施与应用 被引量:1
14
作者 黄强 《教练机》 2011年第4期62-65,共4页
随着信息处理技术的精度、可靠度等要求的进一步提高,采用高性能计算集群系统已经成为数字化制造中的关键技术之一。本文结合高性能计算应用现状的不足,阐述了Platform LSF软件设计思想和目标,介绍了该软件的实施与应用情况。
关键词 高性能计算 plaffrom lsf软件
下载PDF
High-Performance Network Communications for CSCW
15
作者 宋军 顾冠群 《Journal of Southeast University(English Edition)》 EI CAS 1996年第2期7-12,共6页
Computer supported cooperative work as a new multi disciplinary research area, brings a lot of new challenges for the computer technologies. Having analyzed the CSCW applications by using the groupware space time mat... Computer supported cooperative work as a new multi disciplinary research area, brings a lot of new challenges for the computer technologies. Having analyzed the CSCW applications by using the groupware space time matrix, we conclude that the communicatio 展开更多
关键词 CSCW high speed NETWORK MULTIMEDIA high performance COMMUNICATIONS platform
下载PDF
Research Progress in Improving the Cycling Stability of High-Voltage LiNi0.5Mn1.5O4 Cathode in Lithium-Ion Battery 被引量:10
16
作者 XiaoLong Xu SiXu Deng +2 位作者 Hao Wang JingBing Liu Hui Yan 《Nano-Micro Letters》 SCIE EI CAS 2017年第2期97-115,共19页
High-voltage lithium-ion batteries(HVLIBs) are considered as promising devices of energy storage for electric vehicle, hybrid electric vehicle, and other high-power equipment. HVLIBs require their own platform voltage... High-voltage lithium-ion batteries(HVLIBs) are considered as promising devices of energy storage for electric vehicle, hybrid electric vehicle, and other high-power equipment. HVLIBs require their own platform voltages to be higher than 4.5 V on charge. Lithium nickel manganese spinel LiNi_(0.5)Mn_(1.5)O_4(LNMO) cathode is the most promising candidate among the 5 V cathode materials for HVLIBs due to its flat plateau at 4.7 V. However, the degradation of cyclic performance is very serious when LNMO cathode operates over 4.2 V. In this review, we summarize some methods for enhancing the cycling stability of LNMO cathodes in lithium-ion batteries, including doping, cathode surface coating,electrolyte modifying, and other methods. We also discuss the advantages and disadvantages of different methods. 展开更多
关键词 high-voltage cathode LINI0.5MN1.5O4 Lithium-ion battery Cycling stability platform voltage
下载PDF
高空台流量管新型篦齿密封特性分析及结构优化设计
17
作者 艾延廷 张文亮 +3 位作者 田金虎 侯鑫正 张兴源 孙丹 《推进技术》 EI CAS CSCD 北大核心 2024年第11期204-214,共11页
针对高空台流量管与导流盆连接结构减小气体泄漏、避免出现反向进气压力过大导致结冰的设计要求,开展不同内径流量管新型篦齿密封特性及结构参数优化研究。建立了高空台新型流量管篦齿密封结构有限元模型,并开展了新型流量管篦齿密封结... 针对高空台流量管与导流盆连接结构减小气体泄漏、避免出现反向进气压力过大导致结冰的设计要求,开展不同内径流量管新型篦齿密封特性及结构参数优化研究。建立了高空台新型流量管篦齿密封结构有限元模型,并开展了新型流量管篦齿密封结构泄漏特性实验研究。基于数值模拟与试验,研究了流量管内径对密封性能的影响规律。根据Box-Behnken响应面设计法,选取不同流量管内径下的密封间隙、控制口数量以及孔型出口数量为优化参数,进行新型篦齿密封结构参数优化设计研究。结果表明:仿真泄漏量与试验值相比最大误差不超过7%,证明了本文仿真模型的有效性;当结构内径由1 m增大到3 m,密封泄漏量由0.021 kg/s逐渐增加到0.162 kg/s,增幅高达671.4%;内径1 m,2 m和3 m篦齿密封结构经优化后,最大流速分别减小了16.1%,14.3%和9.7%,泄漏量分别降低50.74%,98.50%和97.52%。本文研究为高空台新型流量管篦齿密封结构优化设计提供了有效方法,也为流量管尺寸规范化设计提供了技术支撑。 展开更多
关键词 高空台 篦齿封严 有限元分析 泄漏特性 优化设计
下载PDF
桑托斯盆地盐下孤立碳酸盐台地沉积建造与深水大油田
18
作者 窦立荣 温志新 +7 位作者 王兆明 贺正军 宋成鹏 陈瑞银 阳孝法 刘小兵 刘祚冬 陈燕燕 《石油勘探与开发》 EI CAS CSCD 北大核心 2024年第4期829-840,共12页
针对桑托斯被动陆缘盆地深水盐下碳酸盐岩储层分布特征及大油田成藏规律不清的难题,综合利用地质、地震及岩心等数据资料,通过早白垩世原型盆地与岩相古地理恢复重建,提出盐下碳酸盐岩沉积建造受控于坳间断隆型和坳中断凸型两类孤立台... 针对桑托斯被动陆缘盆地深水盐下碳酸盐岩储层分布特征及大油田成藏规律不清的难题,综合利用地质、地震及岩心等数据资料,通过早白垩世原型盆地与岩相古地理恢复重建,提出盐下碳酸盐岩沉积建造受控于坳间断隆型和坳中断凸型两类孤立台地。坳间断隆型孤立台地分布于现今盐下坳间隆起带上,建造于早期陆内和陆间裂谷两个原型阶段继承性发育的单断式和双断式垒式断块上,早白垩世陆内裂谷晚期沉积的ITP组介壳灰岩和陆间裂谷早期沉积的BVE组微生物灰岩为连续建造;坳中断凸型孤立台地分布于现今盐下坳陷带中,建造于早期陆内裂谷原型阶段火山岩建隆所形成的凸起带上,发育BVE组微生物灰岩。两类孤立台地灰岩所形成礁滩体均具有储层厚度大、物性好的特点。结合盐下已发现大油田解剖,发现两类台地均可形成大型构造-岩性复合圈闭,周缘为优质湖相和潟湖相烃源岩环绕,上覆为巨厚的优质蒸发盐岩盖层高效封堵,形成了“下生中储上盖”式最佳生储盖组合关系,油气富集程度高。已发现大油田均为具有统一压力系统的底水块状油田,且均处于充满状态。未来勘探重点目标是西部隆起带和东部隆起带南段上的坳间断隆型孤立台地及中央坳陷带中的坳中断凸型孤立台地。该项研究成果为在桑托斯被动陆缘盆地超前选区选带、新项目评价及中标区块探区勘探部署提供了重要依据,也为今后在全球被动大陆边缘盆地深水勘探战略选区提供借鉴。 展开更多
关键词 桑托斯盆地 被动陆缘盆地 深水 坳间断隆型孤立碳酸盐台地 坳中断凸型孤立碳酸盐台地 大油田
下载PDF
数字化转型、平台化变革与企业创新绩效——基于“技术—组织—创新”范式的分析 被引量:9
19
作者 余东华 马路萌 《改革》 CSSCI 北大核心 2024年第2期55-74,共20页
在数字经济和实体经济深度融合、全球创新竞争加剧的背景下,加快数字化转型和平台化变革,塑造多元互动和整体进化的创新生态系统,是增强制造业企业自主创新能力的重要途径。在传统技术经济范式中引入数字要素和平台理念,构建“技术—组... 在数字经济和实体经济深度融合、全球创新竞争加剧的背景下,加快数字化转型和平台化变革,塑造多元互动和整体进化的创新生态系统,是增强制造业企业自主创新能力的重要途径。在传统技术经济范式中引入数字要素和平台理念,构建“技术—组织—创新”理论框架,分析数字化转型促进组织平台化变革进而提升企业创新绩效的作用机制。在理论分析的基础上,基于2014—2021年中国制造业上市公司的面板数据,实证检验了数字化转型、平台化变革与企业创新绩效之间的关系。研究结果表明:数字化转型对企业创新绩效的提升具有普遍的促进作用,并且对数字化水平更高和股权集中度更高的企业效果更显著;数字化转型促进了企业组织的平台化变革,基于数字平台形成创新生态系统进而增强了企业自主创新能力;数字化对企业平台化的推动作用主要通过专业化分工和企业互联互通实现,这是工业互联网平台发挥作用的两个重要维度。推动制造业企业的数字化转型和平台化变革,充分发挥数字平台的创新基础设施作用,能够提升企业创新绩效,推动制造业高质量发展。 展开更多
关键词 数字化转型 平台化变革 企业创新绩效 制造业高质量发展
下载PDF
公立医院高质量发展背景下平台型领导对护士创新行为影响研究
20
作者 刘颖 周航 曹琦 《中国卫生政策研究》 CSCD 北大核心 2024年第3期72-78,共7页
目的:为提高公立医院护士队伍创新绩效,提升护理服务质量,推动公立医院高质量发展,本文基于实地调研,系统探索公立医院护士长平台型领导风格促进下属护士创新行为的作用机制。方法:采用方便抽样,对J省与N省三家公立医院428名护士进行问... 目的:为提高公立医院护士队伍创新绩效,提升护理服务质量,推动公立医院高质量发展,本文基于实地调研,系统探索公立医院护士长平台型领导风格促进下属护士创新行为的作用机制。方法:采用方便抽样,对J省与N省三家公立医院428名护士进行问卷调查,并通过相关分析和回归分析对护士长平台型领导风格水平与护士工作繁荣、任务相关信息处理能力和创新行为间关系进行检验。结果:护士长平台型领导风格可以通过提升下属护士任务相关信息处理能力和工作繁荣两重机制共同促进他们的创新行为。结论和建议:公立医院应通过加强各科室护士长平台型领导风格水平,鼓励其通过这一领导风格的发挥着力提升下属护士任务相关信息处理能力和工作繁荣水平,促进下属护士展现更多创新行为,最终实现公立医院护理服务质量提升和高质量发展。 展开更多
关键词 公立医院 高质量发展 护士 平台型领导 创新行为
下载PDF
上一页 1 2 94 下一页 到第
使用帮助 返回顶部