检索结果-南通市图书馆

Pragma Directed Shared Memory Centric Optimizations on GPUs

Journal of Computer Science & Technology 2016年第2期31卷 235-252页

作者： Jing Li CCF, Lei Liu Yuan wu xiang-hua Liu Yi Gao Xiao-Bing Feng Cheng-Yongwu State Key Laboratory of Computer Architecture Institute of Computing Technology Chinese Academy of Sciences Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China Beijing Samsung Telecom Research and Development Center Beijing 100028 China

GPUs become a ubiquitous choice as coprocessors since they have excellent ability in concurrent processing. In GPU architecture, shared memory plays a very important role in system performance as it can largely improve bandwidth utilization and accelerate memory operations. However, even for affine GPU applications that contain regular access patterns, optimizing for shared memory is not an easy work. It often requires programmer expertise and nontrivial parameter selection. Improper shared memory usage might even underutilize GPU resource： Even using state-of-the-art high level programming models （e.g., OpenACC and OpenHMPP）, it is still hard to utilize shared memory since they lack inherent support in describing shared memory optimization and selecting suitable parameters, let alone maintaining high resource utilization. Targeting higher productivity for affine applications, we propose a data centric way to shared memory optimization on GPU. We design a pragma extension on OpenACC so as to convey data management hints of programmers to compiler. Meanwhile, we devise a compiler framework to automatically select optimal parameters for shared arrays, using the polyhedral model. We further propose optimization techniques to expose higher memory and instruction level parallelism. The experimental results show that our shared memory centric approaches effectively improve the performance of five typical GPU applications across four widely used platforms by 3.7x on average, and do not burden programmers with lots of pragmas.

关键词： GPU shared memory pragma directed data centric

来源：

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

Preface for Special Issue on“Key Mechanical Problems of Marine Energy Development Equipment”

引用

China Ocean Engineering 2022年第4期36卷 509-510页

作者： wu Wen-hua Faculty of Vehicle Engineering and Mechanics State Key Laboratory of Structural Analysis of Industrial EquipmentDalian University of TechnologyDalian 116024China Ningbo Institute of Dalian University of Technology Ningbo 315000China

There are abundant energy reserves such as oil,natural gas,hydrate,and wind energy in the *** around the globe are competing to advance their marine energy development *** exploitation of marine resources relies on cutting-edge industrial *** decades of R&D endeavors,China has obtained most of the key technologies for the design,production,testing,and field application of marine energy development equipment(Xie and Zeng,2021).

关键词： Key Mechanical Problems of Marine Energy Development Equipment Preface for Special Issue on

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

An investigation of cellular distribution of manganese in hyperaccumlator plant Phytolacca acinosa Roxb. using SRXRF analysis

引用

Journal of Environmental Sciences 2006年第4期18卷 746-751页

作者： XU xiang-hua SHI Ji-yan CHEN Ying-xu XUE Sheng-guo wu Bei huaNG Yu-ying Department of Environmental Engineering Zhejiang University Hangzhou 310029 China Institute of High Energy Physics Chinese Academy of Sciences Beijing 100039 China

Phytolacca acinosa Roxb. （P acinosa） is a recently discovered manganese hyperaccumulator plant from southern China. It is a good candidate for phytoremediation of manganese（Mn） polluted soil for its high biomass and fast growth. Knowledge of the tissue localization and identification of heavy metals can provide essential information on metal toxicity and bioaccumulation mechanisms. Synchrotron radiation X-ray fluorescence spectroscopy （SRXRF） microprobe was used in this study to investigate the cellular distributions of Mn and other elements in root, stem, leaf, petiole and midrib of P. acinosa. The highest Mn content was found in the vascular tissues of root, stem, petiole and midrib. Cortex in root played a key role in Mn absorption and Mn was limited in the vascular bundle during the process of transportation in stem. Moreover, Mn content in leaf epidermis was higher than that in mesophyll, which suggested that the sequestration of Mn in leaf epidermis might be one of the detoxification mechanisms of P. acinosa. The significance of other elemental （such as P, S, K, Ca, Fe, Zn and Cu） distribution patterns and the correlation with Mn were also discussed.

关键词： hyperaccumulator Phytolacca acinosa Roxb. manganese element distribution SRXRF

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Reversal of circularly polarized luminescence direction and an“onoff”switch driven by exchange between UV light irradiation and the applied direct current electric field

引用

Science China Chemistry 2022年第10期65卷 1945-1952页

作者： Kun Yao Zheng Liu Hang Li Dan Xu Wen-hua Zheng Yi-wu Quan Yi-xiang Cheng Jiangsu Key Laboratory of Advanced Organic Materials School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China Key Laboratory of High Performance Polymer Material and Technology of Ministry of Education Department of Polymer Science and EngineeringSchool of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China

We report the rational design of a dual stimulus-activated quaternary chiral emission nematic liquid crystals(Q-N*-LCs)containing light-driven chiral dopant R-S-R-1,a static chiral dopant S-2 and an achiral Nile Red(NR)in a nematic liquid crystal(SLC1717).The dopant R-S-R-1 acts as a dynamic chiral donor and an energy donor,and the achiral NR serves as a circularly polarized luminescence(CPL)emitter and energy ***,this kind of Q-N*-LCs appears reversal CPL emission direction(L-CPL)using 365 nm UV light irradiation compared with the initial state(R-CPL).Most importantly,the“On-Off”CPL switch behavior of Q-N*-LCs can be repeatedly driven by revoking or rearranging the applied direct current(DC)electric *** OR chiral information logic gate demonstrates that this dual driven Q-N*-LCs can be potentially used for chiral information storage and coding.

关键词： chiral supramolecular liquid crystals circularly polarized luminescence light and electricity dual stimuli-activated Förster resonance energy transfer

来源：

维普期刊数据库

同方期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Performance of digital data acquisition system in gamma-ray spectroscopy

引用

Nuclear Science and Techniques 2021年第8期32卷 12-22页

作者： Di-Wen Luo Hong-Yi wu Zhi-huan Li Chuan Xu Hui hua xiang-Qing Li xiang Wang Shuang-Quan Zhang Zhi-Qiang Chen Chen-Guang wu Yu Jin Jie Lin State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871China

A newly developed digital data acquisition system,which is based on the digital pulse processor Pixie-16 modules by XIA LLC,was tested with the c-ray detector array of the China Institute of Atomic Energy using the cray source and in-beam c-rays.A comparison between this digital data acquisition system and the conventional analog data acquisition system was *** a low count rate,both systems exhibit good and comparable energy *** a high count rate above 8.8 k/s,while the energy resolution obtained by the analog system deteriorates significantly,the energy resolution obtained by the digital system is nearly ***,experimental data with higher statistics can be collected by the digital *** advantage of this digital system over the conventional analog system can be ascribed to its excellent capability of handling pile-up pulses at higher count rates,and the fact that it has nearly no dead time in data transmission and conversion.

关键词： Digital data acquisition system Gamma spectroscopy Energy resolution

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Improved Operation Characteristics for Nonvolatile Charge-Trapping Memory Capacitors with High-κ Dielectrics and SiGe Epitaxial Substrates

引用

Chinese Physics Letters 2017年第9期34卷 95-99页

作者： Zhao-Zhao Hou Gui-Lei Wang Jin-Juan xiang Jia-Xin Yao Zhen-hua wu Qing-Zhu Zhang hua-xiang Yin Key Laboratory of Microelectronics Devices&Integrated Technology Institute of MicroelectronicsChinese Academy of SciencesBeijing 100029 University of Chinese Academy of Sciences Beijing 100049

A novel high-κ~ A1203/HfO2/AI203 nanolaminate charge trapping memory capacitor structure based on SiGe substrates with low interface densities is successfully fabricated and investigated. The memory capacitor exhibits excellent program-erasable characteristics. A large memory window of ~4 V, a small leakage current density of ~2 ×10-6 Acre-2 at a gate voltage of 7V, a high charge trapping density of 1.42 × 1013 cm-2 at a working vo]tage of 4-10 V and good retention characteristics are observed. Furthermore, the programming （△ VFB = 2.8 V at 10 V for 10μs） and erasing speeds （△VFB =-1.7 V at -10 V for 10μs） of the fabricated capacitor based on SiGe substrates are significantly improved as compared with counterparts reported earlier. It is concluded that the high-κ Al2O3/HfO2/Al2O3 nanolaminate charge trapping capacitor structure based on SiGe substrates is a promising candidate for future nano-scaled nonvolatile flash memory applications.

关键词： Dielectrics and SiGe Epitaxial Substrates Improved Operation Characteristics for Nonvolatile Charge-Trapping Memory Capacitors with High

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Template-free preparation of porous Co microfibers from spent lithium-ion batteries as a promising microwave absorber

引用

Rare Metals 2022年第10期41卷 3475-3485页

作者： Xiao-Min wu Fei Xie Yong-Lin Yao Yue Sun Zhong-Sheng hua Zhuo Zhao Yong-xiang Yang Anhui Province Key Laboratory of Metallurgical Engineering&Resources Recycling School of Metallurgical EngineeringAnhui University of TechnologyMaanshan243002China Department of Materials Science and Engineering Delft University of TechnologyDelft2628CDNetherlands

In order to take full advantage of the secondary resources,in this paper,we reported a template-free process to prepare porous Co microfibers from spent lithiumion batteries(LIBs).First,the waste LiCoO_(2) powders were leached by oxalic acid at a suitable temperature,and rodlike cobalt oxalate powders were ***,the porous Co microfibers were prepared by using the cobalt oxalate as precursors through a thermal decomposition at420 ℃ under nitrogen *** prepared Co microfibers possess diameters of 1-2 μm,and each microfiber consists of small particles with size of100-200 *** Co microfibers(25 wt%)/paraffin composite exhibited excellent microwave absorption *** the sample thickness is 4.5 mm,the reflection losses reach-36.14 and-38.20 dB at 4.16 and 17.60 GHz,respectively,and the effective bandwidth reaches up to 5.52 *** indicates that the Co microfibers can be used as a promising microwave ***,this paper demonstrates a novel process to make a high value-added product through recycling from the spent lithium-ion *** addition,it is advantageous to eliminate the hazard of spent lithium-ion batteries and electromagnetic radiation to environment and human health.

关键词： Spent lithium-ion batteries(LIBs) Co microfibers Recycling Oxalic acid leaching Microwave absorption

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Superior corrosion resistance-dependent laser energy density in(CoCrFeNi)95Nb5 high entropy alloy coating fabricated by laser cladding

引用

International Journal of Minerals,Metallurgy and Materials 2021年第5期28卷 888-897页

作者： Wen-rui Wang wu Qi Xiao-li Zhang Xiao Yang Lu Xie Dong-yue Li Yong-hua xiang School of Mechanical Engineering University of Science and Technology BeijingBeijing 100083China Key Laboratory of Fluid Interaction with Material Ministry of EducationBeijing 100083China R&D management department China nuclear power technology research institute Co.Ltd.Shenzhen 518031China Key Laboratory of Cryogenics Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China Unit 92228 People’s Liberation ArmyBeijing 100072China

(CoCrFeNi)95Nb5 high entropy alloy(HEA)coatings were successfully fabricated on a substrate of Q235 steel by laser cladding ***(CoCrFeNi)95Nb5 HEA coatings possess excellent properties,particularly corrosion resistance,which is clearly superior to that of some typical bulk HEA and common engineering *** order to obtain appropriate laser cladding preparation process parameters,the effects of laser energy density on the microstructure,microhardness,and corrosion resistance of(CoCrFeNi)95Nb5 HEA coating were closely *** showed that as the laser energy density increases,precipitation of the Laves phase in(CoCrFeNi)95Nb5 HEA coating gradually decreases,and diffusion of the Fe element in the substrate intensifies,affecting the integrity of the(CoCrFeNi)95Nb5 *** decreases the microhardness of(CoCrFeNi)95Nb5 HEA ***,the relative content of Cr2O3,Cr(OH)3,and Nb2O5 in the surface passive film of the coating decreases with increasing energy density,causing corrosion resistance to *** study demonstrates the controllability of a high-performance HEA coating using laser cladding technology,which has significance for the laser cladding preparation of other CoCrFeNi-system HEA coatings.

关键词： high entropy alloy coating laser cladding technology laser energy density corrosion resistance

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Crystallization Kinetics of Pr8Fe86-xZrxB6 Amorphous Alloys

引用

Journal of Iron and Steel Research International 2002年第2期9卷 49-52页

作者： LIU Jian-hua ZHANG Peng-yue ZHANG Jing-wu LI Hui ZHANG xiang-yi Yanshan University

Two experimental methods were adopted to verify the correctness and practicability of the shape meter method: one is to roll aluminum plate, calculate the shape stiffness of mill and rolled piece, and then measure aluminum plate crown to verify shape stiffness equation; the other is to calculate the measured off line data of hot continuous roll and verify the shape mathematical model for measuring and controlling by self adaptation method.

关键词： shape meter method shape stiffness equation mathematical model post calculation self adaptation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

The thickness and volume of the choroid,outer retinal layers and retinal pigment epithelium layer changes in patients with diabetic retinopathy

引用

International Journal of Ophthalmology(English edition) 2018年第12期11卷 1957-1962页

作者： xiang-Ning Wang Shu-Ting Li Wei Li Yan-Jun hua Qiang wu Department of Ophthalmology Shanghai Jiao Tong University Affiliated Sixth People's HospitalShanghai 200233China Shanghai Key Laboratory of Diabetes Mellitus Shanghai 200233China

AIM: To evaluate the thickness and volume changes of the choroidal, outer retinal layers(ORL) and retinal pigment epithelium(RPE) in patients with diabetic retinopathy(DR) using optical coherence tomography(OCT) and correlate them with visual ***: We carried out a retrospective observational case series. Consecutive DR patients were recruited for color fundus photography and OCT assessment. The RPE, ORL and choroidal thickness were measured. The correlation with the best-corrected visual acuity(BCVA) was also ***: The study included 128 eyes, comprising 45 eyes of 25 diabetic macular edema(DME) patients, 34 eyes of 20 DR without DME(non-DME) patients, and 49 eyes of 25 age-matched normal individuals. The choroidal thickness in DR patients were decreased statistically significantly compared with the control group(P<0.05). The mean macular ORL thickness in DME(73.02±15.34 μm) and non-DME groups(76.35±7.32 μm) were decreased statistically significantly compared with the control group(80.20±5.85 μm; P=0.006, P=0.013, respectively). In both the non-DME and DME groups, the RPE thickness were decreased compared with the control group(P<0.05), except in the macular and central ring. The BCVA were significant interactions with the total inner retinal volume and macular RPE thickness in the DME group(r=0.115, P<0.001, r=-0.013, P=0.017, respectively).CONCLUSION: The choroid, ORL and RPE thickness are significantly decreased in DR patients compared with controls in different segments.

关键词： choroid diabetic macular edema outer retinal layers retinal pigment epithelium diabetic retinopathy

来源：

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

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：