检索结果-南通市图书馆

Chinese Gravimetry Augment and Mass Change Exploring Mission Status and Future

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Geodesy and Geoinformation Science 2023年第3期6卷 67-75页

作者： Yun XIAO Yuanxi YANG Zongpeng PAN Yunlong WU zehua guo Xi’an research Institute of Surveying and Mapping Xi’an 710054China State Key Laboratory of Geographic Information En-gineering Xi’an 710054China School of Geography and Information Engineering China University of GeosciencesWuhan 430074China School of Geodesy and Geomatics Wuhan UniversityWuhan 430074China

The satellite gravimetry technology effectively recovers the global Earth’s gravity field.Since 2000s,HL-SST satellite CHAMP,LL-SST satellite GRACE,Gravity Gradient Measurement(GGM)satellite GOCE have been launched successfully,producing some Earth’s gravity models solely from satellites data.However,the space and time resolution of the Earth’s gravity fields do not adequately satisfy scientific objectives.The main reason is that the gravimetry satellites are not enough and observation data insufficient.The paper outlines the current and future status of Chinese gravity satellite missions.The Chinese gravimetry satellite system,named Chinese Gravimetry augment and Mass change exploring mission(ChiGaM),successfully launched in Dec.2021 after four years of production and over a year of calibration and valiation.The accelerometer,K-band ranging system and the three stellar sensors,among others,were precisely calibrated and trimmed.The satellite mass center was determined and coordinated with the proof center of accelerometer with an accuracy 100μm.The inter-satellite ranging system and BDS/GPS receiver operate together seamlessly.The range and range rate noise is less than 3μm/Hz^(1/2) and 1μm/s/Hz^(1/2),respectively,in band of 0.025~0.1 Hz.The electrostatic suspension accelerometer is working well.Its high-sensitive axis noise level is 3×10^(-10) m/s^(2)/Hz^(1/2)near the frequency 0.1 Hz,and 1×10^(-9) m/s^(2)/Hz^(1/2) for the less-sensitive axis.Meanwhile the BDS/GPS receiver is used to achieve data for precise orbit determination,yielding an orbit result with accuracy better than 2 cm.When compared with KBR observations,the RMS of the bias is less than 1 mm.Besides above mission,next gravimetric satellite is being developed now.TQ-2 mission is designed as a totally experimental satellite for gravitational wave detection at low Earth orbit,which can detect the Earth’s gravity field simultaneously.The Bender-type mission is considered the most promising configuration for TQ-2 and consists of two polar satellites and

关键词： satellite gravimetry the Earth’s gravity field gravity GRACE GRACE-FO GOCE

Defending Against Link Failure in Virtual Network Embedding Using a Hybrid Scheme

在线全文

学校读者我要写书评

暂无评论

China Communications 2019年第1期16卷 129-138页

作者： Jianjian Ai Hongchang Chen zehua guo guozhen Cheng National Digital Switching System Engineering & Technological R&D Center University of Minnesota Twin Cities

Nowadays network virtualization is utterly popular.As a result,how to protect the virtual networks from attacking on the link is increasingly important.Existing schemes are mainly backup-based,which suffer from data loss and are helpless to such attacks like data tampering.To offer high security level,in this paper,we first propose a multipath and decision-making(MD) scheme which applies multipath simultaneously delivery and decision-making for protecting the virtual network.Considering different security requirement for virtual link,we devise a hybrid scheme to protect the virtual links.For the critical links,MD scheme is adopted.For the other links,we adopt the Shared Backup Scheme.Our simulation results indicate the proposed scheme can significantly increase the security level of the critical link high in the loss of less acceptance ratio.

关键词： network virtualization virtual link security multipath and decision-making hybrid scheme

基于蓄热装置辅助的燃料电池电动车供暖系统动态仿真

在线全文

学校读者我要写书评

暂无评论

汽车安全与节能学报 2024年第1期15卷 54-62页

作者：宋泽华陈浩郭航叶芳张惟博北京工业大学传热强化与过程节能教育部重点实验室及传热与能源利用北京市重点实验室北京100124 茨维考应用科学大学汽车工程学院德国茨维考08012

为了辅助燃料电池车辆预热,提升燃料电池在低温下的冷启动速率以及降低电动车能耗,该文提出了一种基于热泵和蓄热装置联合的燃料电池电动车供暖方案,并开展了燃料电池车辆系统动态仿真研究,对比了有无蓄热装置辅助的系统对车辆运行过程... 详细信息

为了辅助燃料电池车辆预热,提升燃料电池在低温下的冷启动速率以及降低电动车能耗,该文提出了一种基于热泵和蓄热装置联合的燃料电池电动车供暖方案,并开展了燃料电池车辆系统动态仿真研究,对比了有无蓄热装置辅助的系统对车辆运行过程的影响。结果表明:在寒冷运行环境下,蓄热装置可确保驾驶循环工况下循环冷却液热量来源的连续性,相较于无蓄热装置的热管理系统,热泵和蓄热联合供暖方案可使空调系统能耗下降26%;利用蓄热装置辅助的供暖系统能够改善燃料电池电动车的冬季冷启动特性,优化车辆电池系统的热管理。

关键词：燃料电池电动车热泵空调蓄热冷启动

在线全文

学校读者我要写书评

暂无评论

生物质好氧发酵热生产与回收利用研究进展

农业工程学报 2024年第5期40卷 25-37页

作者：于艳玲曹永娜贺巍周宁邹泽华朱宇航郭超秦江哈尔滨工业大学化工与化学学院哈尔滨150001 哈工大郑州研究院郑州450003 黑龙江省建设投资集团有限公司碳中和研究院哈尔滨150001 哈尔滨工业大学能源科学与工程学院哈尔滨150001

好氧发酵是目前有机固体废弃物处理的一种有效手段。人们对于好氧发酵的研究主要集中在高效有机肥的获取上,但发酵过程产生的热能不容忽视。发酵热作为一种“零碳”能源,可代替传统化石能源应用于加温供暖、生物干化等领域,助力实现“... 详细信息

好氧发酵是目前有机固体废弃物处理的一种有效手段。人们对于好氧发酵的研究主要集中在高效有机肥的获取上,但发酵过程产生的热能不容忽视。发酵热作为一种“零碳”能源,可代替传统化石能源应用于加温供暖、生物干化等领域,助力实现“碳达峰、碳中和”。为将生物质能高效转化为热能利用,人们对发酵热回收利用进行了研究,但是没有将热生产、热回收和热利用三个阶段进行系统联系,导致热回收工艺效率不高。该文主要阐述了好氧发酵产热原理,并从菌剂、原料理化性质和发酵工艺三个方面对发酵热生产的影响进行了探讨,总结了现有热回收利用系统,最后对生物质好氧发酵热生产与回收利用系统的发展方向进行展望,以期为生物质发酵热能利用提供支持。

关键词：生物质好氧发酵发酵产热能量回收废热利用

Adaptive resource allocation for workflow containerization on Kubernetes

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2023年第3期34卷 723-743页

作者： SHAN Chenggang WU Chuge XIA Yuanqing guo zehua LIU Danyang ZHANG Jinhui School of Automation Beijing Institute of TechnologyBeijing 100081China School of Artificial Intelligence Zaozhuang UniversityZaozhuang 277100China

In a cloud-native era,the Kubernetes-based workflow engine enables workflow containerized execution through the inherent abilities of Kubernetes.However,when encountering continuous workflow requests and unexpected resource request spikes,the engine is limited to the current workflow load information for resource allocation,which lacks the agility and predictability of resource allocation,resulting in over and underprovisioning resources.This mechanism seriously hinders workflow execution efficiency and leads to high resource waste.To overcome these drawbacks,we propose an adaptive resource allocation scheme named adaptive resource allocation scheme(ARAS)for the Kubernetes-based workflow engines.Considering potential future workflow task requests within the current task pod’s lifecycle,the ARAS uses a resource scaling strategy to allocate resources in response to high-concurrency workflow scenarios.The ARAS offers resource discovery,resource evaluation,and allocation functionalities and serves as a key component for our tailored workflow engine(KubeAdaptor).By integrating the ARAS into KubeAdaptor for workflow containerized execution,we demonstrate the practical abilities of KubeAdaptor and the advantages of our ARAS.Compared with the baseline algorithm,experimental evaluation under three distinct workflow arrival patterns shows that ARAS gains time-saving of 9.8% to 40.92% in the average total duration of all workflows,time-saving of 26.4% to 79.86% in the average duration of individual workflow,and an increase of 1% to 16% in centrol processing unit(CPU)and memory resource usage rate.

关键词： resource allocation workflow containerization Kubernetes workflow management engine

Two-dimensional materials for future information technology: status and prospects

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2024年第6期67卷 1-147页

作者： Hao QIU Zhihao YU Tiange ZHAO Qi ZHANG Mingsheng XU Peifeng LI Taotao LI Wenzhong BAO Yang CHAI Shula CHEN Yiqi CHEN Hui-Ming CHENG Daoxin DAI Zengfeng DI Zhuo DONG Xidong DUAN Yuhan FENG Yu FU Jingshu guo Pengwen guo Yue HAO Jun HE Xiao HE Jingyi HU Weida HU zehua HU Xinyue HUANG Ziyang HUANG Ali IMRAN Ziqiang KONG Jia LI Qian LI Weisheng LI Lei LIAO Bilu LIU Can LIU Chunsen LIU Guanyu LIU Kaihui LIU Liwei LIU Sheng LIU Yuan LIU Donglin LU Likuan MA Feng MIAO Zhenhua NI Jing NING Anlian PAN Tian-Ling REN Haowen SHU Litao SUN Yue SUN Quanyang TAO Zi-Ao TIAN Dong WANG Hao WANG Haomin WANG Jialong WANG Junyong WANG Wenhui WANG Xingjun WANG Yeliang WANG Yuwei WANG Zhenyu WANG Yao WE Department of Applied Physics The Hong Kong Polytechnic University Key Laboratory for Micro-Nano Physics and Technology of Hunan Province College of Materials Science and EngineeringHunan University College of Integrated Circuits Zhejiang University Shenzhen Geim Graphene Center Shenzhen Key Laboratory of Layered Materials for Value-Added ApplicationsTsinghua-Berkeley Shenzhen Institute & Institute of Materials ResearchTsinghua Shenzhen International Graduate SchoolTsinghua University State Key Laboratory of Extreme Photonics and Instrumentation College of Optical Science and EngineeringInternational Research Center for Advanced PhotonicsZijingang CampusZhejiang University National Key Laboratory of Materials for Integrated Circuits Shanghai Institute of Microsystem and Information TechnologyChinese Academy of Sciences CAS Key Laboratory of Nanophotonic Materials and Devices & Key Laboratory of Nanodevices and Applications i-LabSuzhou Institute of Nano-Tech and Nano-Bionics (SINANO)Chinese Academy of Sciences College of Chemistry and Chemical Engineering Hunan University Key Laboratory of Quantum State Construction and Manipulation (Ministry of Education) Department of PhysicsRenmin University of China School of Integrated Circuits Beijing National Research Center for Information Science and Technology (BNRist)Tsinghua University School of Electronic Science and Engineering Nanjing University The State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology Shaanxi Joint Key Laboratory of GrapheneSchool of MicroelectronicsXidian University Key Laboratory of Artificial Micro- and Nano-Structures of Ministry of Education School of Physics and TechnologyWuhan University School of Integrated Circuits Huazhong University of Science and Technology Center for Nanochemistry (CNC) Beijing Science and Engineering Center for NanocarbonsBeijing National Laboratory for Molecular SciencesCollege of Chemistry and Molecular EngineeringPeking University State Key Laboratory for Artificial Microstruct

Over the past 70 years, the semiconductor industry has undergone transformative changes,largely driven by the miniaturization of devices and the integration of innovative structures and materials. Two-dimensional(2D) materials like transition metal dichalcogenides(TMDs) and graphene are pivotal in overcoming the limitations of silicon-based technologies, offering innovative approaches in transistor design and functionality, enabling atomic-thin channel transistors and monolithic 3D integration. We review the important progress in the application of 2D materials in future information technology, focusing in particular on microelectronics and optoelectronics. We comprehensively summarize the key advancements across material production, characterization metrology, electronic devices, optoelectronic devices, and heterogeneous integration on silicon. A strategic roadmap and key challenges for the transition of 2D materials from basic research to industrial development are outlined. To facilitate such a transition, key technologies and tools dedicated to 2D materials must be developed to meet industrial standards, and the employment of AI in material growth, characterizations, and circuit design will be essential. It is time for academia to actively engage with industry to drive the next 10 years of 2D material research.

关键词： two-dimensional (2D) materials information technology production technology standardization of characterization microelectronicdevices optoelectronic devices multi-functional integration

The m6A reader MhYTP2 regulates the stability of its target mRNAs contributing to low nitrogen tolerance in apple (Malus domestica)

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Horticulture Research 2023年第6期10卷 287-298页

作者： Tianli guo zehua Yang Ru Bao Xiaomin Fu Na Wang Changhai Liu Fengwang Ma State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple College of HorticultureNorthwest A&F UniversityYanglingShaanxi 712100China

Studies have shown that the m6A reader primarily affects genes expression by participating in the regulation of mRNA localization,splicing,degradation,translation,and other metabolic processes.Previously,we discovered that the apple(Malus domestica)m6A reader MhYTP2 bound with and destabilized m6A-modified MdMLO19 mRNA.In addition,it enhanced the translation efficiency of m6A-modified mRNA of MdGDH1L,encoding a glutamate dehydrogenase,which confers resistance to powdery mildew.In this study,we report the function of MhYTP2 in the regulation of resistance to low nitrogen(N).The overexpression of MhYTP2 enhances the resistance of apple to low N.We show that MhYTP2 binds with and stabilizes the mRNAs of MdALN,which participates in the allantoin catabolic process and cellular response to N starvation in apple;MdPIDL,which participates in root hair elongation;MdTTG1,which is involved in the differentiation process of trichomes;and MdATG8A,which is a core participant in the regulation of autophagy.In addition,MhYTP2 accelerates the degradation of MdRHD3 mRNA,which regulates root development.RNA immunoprecipitation-seq and electrophoretic mobility shift assays show that the mRNAs of MdALN,MdATG8A,MdPIDL,MdTTG1,and MdRHD3 are the direct targets of MhYTP2.Overexpressing or knocking down the above genes in MhYTP2 overexpressing plants dismisses the function of MhYTP2 under low N,suggesting the role of MhYTP2 is dependent on those genes.Together,these results demonstrate that MhYTP2 enhances the resistance of apple to N deficiency by affecting the stability of the bound mRNAs.

关键词： dis translation expressing

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

宁夏不同生态类型区土壤养分状况比较分析

寒旱农业科学 2024年第5期3卷 434-440页

作者：李百云许泽华郭鑫年周涛宁夏农林科学院园艺研究所宁夏银川750002 宁夏农林科学院农业资源与环境研究所宁夏银川750002

为了解宁夏土壤地力养分状况,对宁夏三个生态区主要土壤类型进行典型区域采样,测定了0~40 cm土层土壤pH、有机碳(组分)、全氮、全磷、全钾、速效磷、阳离子交换量(CEC)以及交换性钾、钠、钙、镁和颗粒组成、矿物组成等理化性状。结果表... 详细信息

为了解宁夏土壤地力养分状况,对宁夏三个生态区主要土壤类型进行典型区域采样,测定了0~40 cm土层土壤pH、有机碳(组分)、全氮、全磷、全钾、速效磷、阳离子交换量(CEC)以及交换性钾、钠、钙、镁和颗粒组成、矿物组成等理化性状。结果表明,中部干旱带土壤养分含量最低,其次为宁南山区,引黄灌区营养状况总体最好。pH和盐基饱和度均是引黄灌区(银北)最高,宁南山区最低,矿质离子含量中部干旱带最低。土壤颗粒组成中,宁南山区土壤组成最好,中间粗细颗粒占主要成分。宁南山区黑垆土和灰褐土的土壤氮含量较高,分别是0.83 g/kg和1.51 g/kg,其余土壤均低于0.60 g/kg,土壤氮素匮乏。引黄灌区盐碱土和灌淤土速效磷含量分别为19.62 mg/kg和18.28 mg/kg,是该生态区灰漠土和灰钙土的速效磷3~4倍。中部干旱带黄绵土速效磷含量为15.82 mg/kg,而宁南山区黄绵土速效磷含量仅为3.13 mg/kg,不足1/5。引黄灌区(银北)的灰漠土和宁南山区灰褐土有机碳含量分别为19.09 g/kg和17.43 g/kg,明显高于其他生态区土壤,其他土壤均低于10.00 g/kg,在全国土壤养分分级中处于第四级及以下,表明宁夏土壤总体有机质含量偏低。引黄灌区和中部干旱带有机质中的胡敏素含量较高,而宁南山区黑垆土和灰褐土中腐殖酸含量较高。

关键词：土壤养分生态类型区土壤类型比较宁夏

维普期刊数据库博看期刊

Failure characteristics and the damage evolution of a composite bearing structure in pillar-side cemented paste backfilling

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2023年第8期30卷 1524-1537页

作者： Boqiang Cui guorui Feng Jinwen Bai Gaili Xue Kai Wang Xudong Shi Shanyong Wang zehua Wang Jun guo College of Mining Engineering Taiyuan University of TechnologyTaiyuan 030024China Key Laboratory of Shanxi Province for Mine Rock Strata Control and Disaster Prevention Taiyuan 030024China Shanxi Coking Coal Group Co. Ltd.Taiyuan 030024China Priority Research Centre for Geotechnical Science and Engineering School of EngineeringThe University of NewcastleCallaghanNSW 2308Australia

A backfilling body-coal pillar-backfilling body(BPB)structure formed by pillar-side cemented paste backfilling can bear overburden stress and ensure safe mining.However,the failure response of BPB composite samples must be investigated.This paper examines the deformation characteristics and damage evolution of six types of BPB composite samples using a digital speckle correlation method under uniaxial compression conditions.A new damage evolution equation was established on the basis of the input strain energy and dissipated strain energy at the peak stress.The prevention and control mechanisms of the backfilling body on the coal pillar instability were discussed.The results show that the deformation localization and macroscopic cracks of the BPB composite samples first appeared at the coal-backfilling interface,and then expanded to the backfilling elements,ultimately appearing in the coal elements.The elastic strain energy in the BPB composite samples reached a maximum at the peak stress,whereas the dissipated energy continued to accumulate and increase.The damage evolution curve and equation agree well with the test results,providing further understanding of instability prevention and the control mechanisms of the BPB composite samples.The restraining effect on the coal pillar was gradually reduced with decreasing backfilling body element's volume ratio,and the BPB composite structure became more vulnerable to failure.This research is expected to guide the design,stability monitoring,instability prevention,and control of BPB structures in pillar-side cemented paste backfilling mining.

关键词： backfilling body-coal pillar-backfilling body composite structure digital speckle correlation method uniaxial compression deformation characteristics damage evolution