检索结果-南通市图书馆

Quafu-RL:The cloud quantum computers based quantum reinforcement learning

chinese Physics B 2024年第5期33卷 29-34页

作者：靳羽欣许宏泽王正安庄伟峰黄凯旋时运豪马卫国李天铭陈驰通许凯冯玉龙刘培陈墨李尚书杨智鹏钱辰马运恒肖骁钱鹏顾炎武柴绪丹普亚南张翼鹏魏世杰曾进峰李行龙桂鲁金贻荣于海峰范桁刘东胡孟军 beijing academy of Quantum Information {2. Beijing 100193China State Key Laboratory of Low Dimensional Quantum Physics Department of PhysicsTsinghua UniversityBeijing 100084China institute of Physics Chinese Academy of SciencesBeijing 100190China Frontier Science Center for Quantum Information Beijing 100184China School of Physical sciences University of Chinese Academy of SciencesBeijing 100190China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of SciencesBeijing 100190China School of Mathematical sciences Nankai UniversityTianjin 300071China

With the rapid advancement of quantum computing,hybrid quantum–classical machine learning has shown numerous potential applications at the current stage,with expectations of being achievable in the noisy intermediate-scale quantum(NISQ)*** reinforcement learning,as an indispensable study,has recently demonstrated its ability to solve standard benchmark environments with formally provable theoretical advantages over classical ***,despite the progress of quantum processors and the emergence of quantum computing clouds,implementing quantum reinforcement learning algorithms utilizing parameterized quantum circuits(PQCs)on NISQ devices remains *** this work,we take the first step towards executing benchmark quantum reinforcement problems on real devices equipped with at most 136 qubits on the BAQIS Quafu quantum computing *** experimental results demonstrate that the policy agents can successfully accomplish objectives under modified conditions in both the training and inference ***,we design hardware-efficient PQC architectures in the quantum model using a multi-objective evolutionary algorithm and develop a learning algorithm that is adaptable to quantum *** hope that the Quafu-RL can be a guiding example to show how to realize machine learning tasks by taking advantage of quantum computers on the quantum cloud platform.

关键词： quantum cloud platform quantum reinforcement learning evolutionary quantum architecture search

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

Investigation of weak interlayer coupling in 2. layered GeS_(2. from theory to experiment

引用

Nano Research 2022年第2期15卷 1013-1019页

作者： Hui-Juan Yan Zongbao Li Shun-Chang Liu Xia Wang Xing Zhang ding-Jiang Xue jin-Song Hu beijing National Laboratory for Molecular sciences(BNLMS) CAS Key Laboratory of Molecular Nanostructure and NanotechnologyInstitute of ChemistryChinese Academy of SciencesBeijing 100190China School of Material and Chemical Engineering Institute of Cultural and Technological Industry Innovation ofTongrenTongren UniversityTongren 554300China University of chinese academy of sciences Beijing 100049China

Interlayer coupling as a unique feature for two-dimensional(2.)materials may influence their thickness-dependent physical properties,especially the bandgap due to quantum confinement ***-studied 2. materials usually possess strong interlayer coupling such as most of transition metal dichalcogenides(TMDs),PtS_(2. and so ***,2. materials with weak interlayer coupling are rarely referred that mainly focus on ReS_(2.,as well as its counterpart ReSe_(2..Here we report a new member of weak interlayer coupling 2. materials,germanium disulfide(GeS_(2.).The interlayer interaction in GeS_(2. is investigated from theory to *** density functional theory calculations,we find that this extraordinarily weak interlayer coupling in GeS_(2. originates from the weak hybridization of interlayer S ***-dependent Raman spectra of GeS_(2. flakes exhibit that the Raman peaks remain unchanged when increasing the thickness;and a small first-order temperature coefficient of-0.00857 cm^(-1)·K^(-1) is obtained from the temperature-dependent Raman *** experimental results further confirm the weak interlayer coupling in GeS_(2..

关键词： interlayer coupling two-dimensional GeS_(2. temperature coefficient

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

Time-sequential changes of differentially expressed miRNAs during the process of anterior lumbar interbody fusion using equine bone protein extract, rhBMP-2.and autograft

引用

Frontiers of Materials Science 2014年第1期8卷 72-86页

作者： Da-Fu CHEN zhi-Yu ZHOU Xue-Jun DAI Man-Man GAO Bao-ding HUANG Tang-Zhao LIANG Rui SHI Li-{2. ZOU Hai-Sheng LI Cody BUNGER Wei TIAN Xue-Nong ZOU Laboratory of Bone Tissue Engineering Beijing Research Institute of Traumatology and Orthopaedics Beijing Jishuitan Hospital Beijing 100035 China Department of Spine Surgery/Orthopaedic Research institute The First Affiliated Hospital of Sun Yat-sen University Guangzhou 510080 China Department of Surgery the First Affiliated Hospital of Nanchang University Nanchang 330006 China Orthopaedic Research Laboratory/The institute of Clinical Medicine Aarhus University Hospital DK-8000 Aarhus Denmark Medicine School Shenzhen University Shenzhen 518060 China

The precise mechanism of bone regeneration in different bone graft substitutes has been well studied in recent researches. However, miRNAs regulation of the bone formation has been always mysterious. We developed the anterior lumbar interbody fusion （ALIF） model in pigs using equine bone protein extract （BPE）, recombinant human bone morphogenetic protein-2.（rhBMP-2. on an absorbable collagen sponge （ACS）, and autograft as bone graft substitute, respectively. The miRNA and gene expression profiles of different bone graft materials were examined using microarray technology and data analysis, including self-organizing maps, KEGG pathway and Biological process GO analyses. We then jointly analyzed miRNA and mRNA profiles of the bone fusion tissue at different time points respectively. Results showed that miRNAs, including let-7, miR-12., m iR-2., miR-133, miR-140, miR-146, miR-184, and miR-2.4, were involved in the regulation of the immune and inflammation response, which provided suitable inflammatory microenvironment for bone formation. At late stage, several miRNAs directly regulate SMAD4, Estrogen receptor 1 and 5-hydroxytryptamine （serotonin） receptor 2. for bone formation. It can be concluded that miRNAs play important roles in balancing the inflammation and bone formation.

关键词： miRNA bone protein extract (BPE) recombinant human bone morphoge-netic protein-2.(rhBMP-2. autograft

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

Thermal energy storage:Challenges and the role of particle technology

引用

Particuology 2014年第4期12卷 2-8页

作者： zhiwei Ge Yongliang Li Dacheng Li Ze Sun Yi jin Chuanping Liu Chuan Li Guanghui Leng Yulong {2. institute of Process Engineering Chinese Academy of Sciences School of Chemical Engineering University of BirminghamBirmingham B152TTUK East china University of Science & Technology School of Mechanical Engineering University of Science & Technology Beijing

Thermal energy is at the heart of the whole energy chain providing a main linkage between the primary and secondary energy sources. Thermal energy storage （TES） has a pivotal role to play in the energy chain and hence in future low carbon economy. However, a competitive TES technology requires a number of scientific and technological challenges to be addressed including TES materials, TES components and devices, and integration of TES devices with energy networks and associated dynamic optimization. This paper provides a perspective of TES technology with a focus on TES materials challenges using molten salts based phase change materials for medium and high temperature applications. Two key challenges for the molten salt based TES materials are chemical incompatibility and low thermal conductivity. The use of composite materials provides an avenue to meeting the challenges. Such composite materials consist of a phase change material, a structural supporting material, and a thermal conductivity enhancement material. The properties of the supporting material could determine the dispersion of the thermal con- ductivity enhancement material in the salt. A right combination of the salt, the structural supporting material, and the thermal conductivity enhancement material could give a hierarchical structure that is able to encapsulate the molten salt and give a substantial enhancement in the thermal conductivity. Understanding of the structure-property relationships for the composite is essential for the formulation design and fabrication of the composite materials. Linking materials properties to the system level performance is recommended as a key future direction of research.

关键词： Thermal energy storageComposite materialsStructure-property relationshipsRole of particle technology

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

Snowdrift effect on snow deposition：Insights from a comparison of a snow pit profile and meteorological observations in east Antarctica

引用

Science china Earth sciences 2017年第4期60卷 672-685页

作者： ding MingHu ZHANG Tong XIAO CunDe LI Chuanjin jin Bo BIAN LinGen WANG ShuJie ZHANG DongQi QIN DaHe State Key Laboratory of Severe Weather Chinese Academy of Meteorological Sciences Beijing 100081 China State Key Laboratory of Cryospheric sciences Northwest Institute of Eco-Environment and Resources Chinese Academy of Sciences Lanzhou 730000 China chinese Arctic and Antarctic Administration Beijing 100860 China

A high-frequency and precise ultrasonic sounder was used to monitor precipitated/deposited and drift snow events over a 3-year period(17 January 2.05 to 4 January 2.08) at the Eagle automatic weather station site,inland *** species and oxygen isotope ratios were also generated from a snow pit below the *** accumulation and snowdrift events were used to examine the synchronism with seasonal variations of δ^(18)O and ion species,providing an opportunity to assess the snowdrift effect in typical Antarctic inland *** were up to 1-year differences for this 3-year-long snow pit between the traditional dating method and ultrasonic *** difference implies that in areas with low accumulation or high wind,the snowdrift effect can induce abnormal disturbances on snow *** snowdrift effect should be seriously taken into account for high-resolution dating of ice cores and estimation of surface mass balance,especially when the morphology of most Antarctic inland areas is similar to that of the Eagle site.

关键词： Urban Evapotranspiration SEBS Remote sensing Anthropogenic heat

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

Responsivity and noise characteristics of AlGaN/GaN-HEMTterahertz detectors at elevated temperatures

引用

chinese Physics B 2019年第5期28卷 355-360页

作者： zhi-Feng Tian Peng Xu Yao Yu Jian-Dong Sun Wei Feng Qing-Feng ding Zhan-Wei Meng Xiang Li {2.-Hua Cai Zhong-Xin Zheng Xin-Xing Li Lin {2. Hua Qin Yun-Fei Sun Key Laboratory of Nano Devices and Applications Suzhou Institute of Nano-tech and Nano-bionics Chinese Academy of Sciences School of Physical Science and Technology Shanghai Technology University Shanghai institute of Ceramics Chinese Academy of Sciences University of chinese academy of sciences Nano Science and Technology institute University of Science and Technology of China School of Nano Technology and Nano Bionics University of Science and Technology of China beijing Huahang Radio Measurement & Research institute College of Electronic and Information Engineering Suzhou University of Sciences and Technology

The responsivity and the noise of a detector determine the sensitivity. Thermal energy usually affects both the responsivity and the noise spectral density. In this work, the noise characteristics and responsivity of an antenna-coupled AlGaN/GaN high-electron-mobility-transistor(HEMT) terahertz detector are evaluated at temperatures elevated from 300 K to 473 K. Noise spectrum measurement and a simultaneous measurement of the source–drain conductance and the terahertz photocurrent allow for detailed analysis of the electrical characteristics, the photoresponse, and the noise behavior. The responsivity is reduced from 59 mA/W to 11 mA/W by increasing the detector temperature from 300 K to 473 K. However,the noise spectral density maintains rather constantly around 1–2.pA/Hz^(1/2. at temperatures below 448 K, above which the noise spectrum abruptly shifts from Johnson-noise type into flicker-noise type and the noise density is increased up to one order of magnitude. The noise-equivalent power(NEP) is increased from 2. pW/Hz^(1/2. at 300 K to 60 pW/Hz^(1/2. at 448 K mainly due to the reduction in mobility. Above 448 K, the NEP is increased up to 1000 pW/Hz^(1/2. due to the strongly enhanced noise. The sensitivity can be recovered by cooling the detector back to room temperature.

关键词： terahertz detection gallium nitride noise spectrum responsivity

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

Extraction of tight binding parameters from in-situ ARPES on the continuously doped surface of cuprates

引用

Science china(Physics,Mechanics & Astronomy) 2018年第12期61卷 25-29页

作者： YiGui Zhong YiMeng Chen JianYu Guan jin Zhao zhiCheng Rao CenYao Tang HaiJiang Liu YuJie Sun Hong {2. beijing National Laboratory for Condensed Matter Physics and institute of Physics Chinese Academy of SciencesBeijing 100190China School of Physics University of Chinese Academy of SciencesBeijing 100190China Collaborative Innovation Center of Quantum Matter Beijing 100190China

Recently we developed a technique of ozone/vacuum annealing to continuously change the doping level of the surface of Bi_2.r_2.aCu_2._(8+)and measured a nearly whole superconducting dome on one surface by in-situ angle-resolved photoemission spectroscopy [arXiv: 1805.06450]. Here we study the evolution of the electronic structures of Bi_2.r_2.aCu_2._(8+)xusing this technique together with tight binding fits. The tight binding parameters are extracted to study their evolution with doping.

关键词： cuprates electronic structures doping evolution tight binding ARPES

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

Balloon Angioplasty as a Modality to Treat Children with Pulmonary Stenosis Secondary to Complex Congenital Heart Diseases

引用

chinese Medical Journal 2017年第23期130卷 2793-2801页

作者： Yan Gu Mei jin Xiao-Fang Wang Bao-jing Guo Wen-Hong {2. zhi-Yuan Wang Ya-Hui Zhang Department of Pediatric Cardiology Beijing Anzhen Hospital Capital Medical University Beijing Institute of Heart Lung and Blood Vessel Diseases Beijing 100029 China

Background： Pulmonary stenosis is common in children with complex congenital heart diseases. Proper management of this problem, especially postoperatively, is still controversial. This study was designed to assess the rate and determinants of success or failure of balloon angioplasty for such lesions. Methods： Clinical and hemodynamic data from 40 pediatric patients （2. boys and 16 girls） with complex congenital heart diseases who underwent balloon angioplasty were reviewed retrospectively from January 2.12.to December 2.16. Patients were divided into four groups accor{2. to the site of stenosis, which included pulmonary valve stenosis （PVS）, valved conduit stenosis, pulmonary artery stenosis （PAS）, and supravalvular pulmonary stenosis （SVPS）. Success rates were calculated accor{2. to defined criteria for initial success and favorable clinical impacts, and comparison between the successful subgroup and the unsuccessful subgroups was analyzed. Results： Grouped by the site of stenosis, initial success rates varied from 40.0% to 52.4% with the greatest success being seen in the PVS group, followed by the PAS group and SVPS group. In the PVS group and the PAS group, there was no statistical difference among age at dilation, postoperative interval, balloon/stenosis ratio, or pressure gradient predilation between the successful and the unsuccessful subgroups. Favorable clinical impacts included success rates of balloon angioplasty in the SVPS group, which was best （100%）, followed by the PVS group （90.9%） and the PAS group （85.7%）. There were a total of two transient complications （5.0%）. Conclusions： Balloon angioplasty was proven to be a safe and useful modality in children with complex congenital heart diseases and postoperative pulmonary stenosis, which should be the initial therapeutic modality in selected patients.

关键词： Balloon Angioplasty Complex Congenital Heart Disease Pulmonary Stenosis

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

A　preliminary　research　establishing　the　present-time　intraplate　blocks　movement　model　on　the　chinese

引用

Acta Seismologica Sinica(English Edition) 1998年第4期11卷 403-412页

作者： Shuo-Yu Zhou (1) Yue-Gang Zhang (1) Guo-Yu ding (2. Yun Wu (1) Xiao-Jun Qin (1) Shun-Ying Shi (1) Qi Wang (1) Xin-Zhao You (1) Xue-Jun Qiao (1) Ping Shuai (1) Gan-jin Deng (1) 1. institute of Seismology China Seismological Bureau 430071 Wuhan China 2. Center for Analysis and Prediction China Seismological Bureau 100036 Beijing China

Ａｐｒｅｌｉｍｉｎａｒｙｒｅｓｅａｒｃｈｅｓｔａｂｌｉｓｈｉｎｇｔｈｅｐｒｅｓｅｎｔ－ｔｉｍｅｉｎｔｒａｐｌａｔｅｂｌｏｃｋｓｍｏｖｅｍｅｎｔｍｏｄｅｌｏｎｔｈｅＣｈｉｎｅｓｅｍａｉｎｌａｎｄｂａｓｅｄｏｎＧＰＳｄａ... 详细信息

Ａｐｒｅｌｉｍｉｎａｒｙｒｅｓｅａｒｃｈｅｓｔａｂｌｉｓｈｉｎｇｔｈｅｐｒｅｓｅｎｔ－ｔｉｍｅｉｎｔｒａｐｌａｔｅｂｌｏｃｋｓｍｏｖｅｍｅｎｔｍｏｄｅｌｏｎｔｈｅＣｈｉｎｅｓｅｍａｉｎｌａｎｄｂａｓｅｄｏｎＧＰＳｄａｔａＳＨＵＯ－ＹＵＺＨＯＵ１）（周...

关键词： present-time intraplate the establishing chinese

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

河南董寨再引入朱鹮种群的巢址分布特征

引用

动物学杂志 2024年第1期59卷 11-18页

作者：黄华王科黄治学蔡德靖刘进法朱家贵席学博王代平河南信阳罗山县董寨国家级自然保护区管理局罗山464236 中国科学院动物研究所动物生态与保护生物学院重点实验室北京100101

为了解再引入朱鹮(Nipponia nippon)种群的分布与扩张情况,本研究对董寨再引入朱鹮野外种群的繁殖巢址进行了调查研究。在2.14到2.2.年间,共调查统计了84个野化放飞朱鹮及其后代的繁殖巢址,使用圆形分布法分析了巢址与放飞点的相对方位... 详细信息

为了解再引入朱鹮(Nipponia nippon)种群的分布与扩张情况,本研究对董寨再引入朱鹮野外种群的繁殖巢址进行了调查研究。在2.14到2.2.年间,共调查统计了84个野化放飞朱鹮及其后代的繁殖巢址,使用圆形分布法分析了巢址与放飞点的相对方位和集中程度,并根据全部巢址的空间分布,使用固定核空间方法计算得到巢区(95%巢址所在区域)与核心巢区(50%巢址所在区域)的分布范围和面积。将巢址图层、土地覆盖图层以及数字高程模型叠加,观察朱鹮巢址选择的生境偏好,并使用单样本t检验判断了巢址平均海拔与巢区海拔间的差异。结果显示,繁殖巢址与放飞点平均距离(平均值±标准差)(12.82.14.11)km(n=84),平均方位角(平均值±标准差)为(138.99±82.44)°(瑞利检验:Z=10.60,P3 km^(2.和549.66 km^(2.。巢址平均海拔(平均值±标准差)(103±43)m,显著低于巢区内平均海拔(t=﹣5.48,df=83,P<0.01)。巢址的分布主要位于水稻田和森林的交界区域。逐年繁殖区域分布图显示,繁殖区域基本朝向西北-东南方向扩张,与圆形分布分析结果一致。本研究描述了董寨再引入朱鹮种群繁殖巢址的分布特征与扩张趋势,可以为野外朱鹮潜在繁殖地和栖息地的保护提供参考,优化保护工作中的人力物力资源配置。

关键词：朱鹮再引入繁殖巢址分布区河南董寨

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

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：