检索结果-南通市图书馆

Tsinghua Science and Technology 2024年第3期29卷 874-882页

作者： Chao wang Qiaoyun Hu Haonan Yao sumin wang Zhi Pei Joint International Research Laboratory of Specialty Fiber Optics and Advanced Communication Shanghai UniversityShanghai 200444China

This work is the first to determine that a real quantum computer(including generalized and specialized)can decipher million-scale RSA relying solely on quantum algorithms,showing the real attack potential of D-Wave *** influence of different column widths on RSA factorization results is studied on the basis of a multiplication table,and the optimal column method is determined by traversal *** traversal experiment of integer factorization within 10000 shows that the local field and coupling coefficients are 75%–93%lower than the research of Shanghai University in 2020 and more than 85%lower than that of Purdue University in *** low Ising model parameters are crucial to reducing the hardware requirements,prompting factoring 1245407 on the D-Wave 2000Q real machine.D-Wave advantage already has more than 5000 qubits and will be expanded to 7000 qubits during 2023–2024,with remarkable improvements in decoherence and *** machine is expected to promote the solution of large-scale combinatorial optimization *** of the contributions of this paper is the discussion of the long-term impact of D-Wave on the development of post-quantum cryptography standards.

关键词： quantum annealing RSA D-Wave 2000Q post-quantum cryptography

Regional Environmental Differentiation in China Sincethe Mid-Pleistocene Inferred from Lake Recordsand Its Relation with East Asian Monsoons

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

Acta Geologica Sinica(English Edition) 1998年第3期72卷 314-320页

作者： wang sumin Xue Bin Nanjing Institute of Geography and Limnology Chinese Academy of Sciences Nanjing Jiangsu 210008

Abstract: Comparative study of long lake records in different regions in China can provide some significant information about the regional differentiation of the environment and Asian monsoon activities. However, intensively studied lacustrine cores with a span of a few hundred thousand years are very rare in China. The available examples are only three long cores from the Zoigê basin in the eastern Qinghai-Tibet plateau, the Qaidam basin in the northern Qinghai-Tibet plateau and the Dianchi basin in the Yunnan plateau respectively. The results show that the regional environmental differentiation since the Mid-Pleistocene involved three stages, i.e. 780–480, 480–160, 160–0 ka B.P. In each of the three stages different regions of China had their own distinctive environmental characteristics, indicating that the uplift of the Qinghai-Tibet plateau played a major role in the environmental differentiation process.

关键词： Mid-Pleistocene regional differentiation Asian monsoon lacustrine deposits

Study on the nutrient evolution and its controlling factors of Longgan Lake for the last 200 years

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2006年第Z1期49卷 193-202页

作者： LIU Jian YANG Xiangdong wang sumin Key Laboratory of Lake Sedimentation and Environment Chinese Academy of Sciences Nanjing 210008 China Key Laboratory of Lake Sedimentation and Environment Chinese Academy of Sciences Nanjing 210008 China Key Laboratory of Lake Sedimentation and Environment Chinese Academy of Sciences Nanjing 210008 China

Based on the total phosphorous (TP) concentration in sediment core, the TP concentration in lake water quantitatively reconstructed from fossil diatoms and diatom-TP transfer function in the Longgan Lake during the last 200 years, the temperature and precipitation data from meteorological observation for the last 50 years, the temperatures and precipitation sequences of climate simulation for the last 200 years, as well as the amount of the agricultural phosphate fertilizer in Longgan area for nearly 50 years, the characteristic and the law of the nutrient status evolution were analyzed, and the influence of the climatic factor, the anthropologic factor and the aquatic biology factor on the nutrient status evolution and its mechanism were discussed for the Longgan Lake during the last 200 years. The results showed that, in the nearly 200 years, the TP concentration in the sediment core of the Longgan Lake gradually increased, its range of variation was situated between 330-580 mg/kg, the mean value was 388 mg/kg, a nearly 30-year vibration adjustment period existed at 1950 around. The TP concentration in lake water changed in a different way. Before 1950, it had a slow increasing tendency in fluctuated background, to 1950 around it reached up to the mean value (52.18 μg/L), and vibrated and adjusted around the mean value, then it fast declined, its change range was situated between 37.75-62.33 μg/L. The analyses indicated that, in the centennial time scale, the climate change was the main controlling factor, while in the decadal time scale in the recent 50 years, human activities were the leading factors for the nutrient status evolution of the Longgan Lake. 60% of the variability of the TP concentration in the sediments and 57% of that in lake water were due to human activities. The differentiation between phosphorus concentration in the sediment and in the lake water reflected the response processes and the adjustment abilities of the lake aquatic ecosystems to th

关键词： Longgan Lake, nutrient evolution, controlling factor, climate, human activities.

An asymptotically optimal public parking lot location algorithm based on intuitive reasoning

在线全文

学校读者我要写书评

暂无评论

Intelligent and Converged Networks 2022年第3期3卷 260-270页

作者： Chao wang Wei Zhang sumin wang Key Laboratory of Specialty Fiber Optics and Optical Access Networks Joint International Research Laboratory of Specialty Fiber Optics Advanced Communication Shanghai Institute for Advanced Communication and Data ScienceShanghai UniversityShanghai 200444China Department of Information Engineering Gannan University of Science and TechnologyGanzhou 341000China

In order to solve the problems of road traffic congestion and the increasing parking time caused by the imbalance of parking lot supply and demand,this paper proposes an asymptotically optimal public parking lot location algorithm based on intuitive reasoning to optimize the parking lot location *** by the idea of intuitive reasoning,we use walking distance as indicator to measure the variability among location data and build a combinatorial optimization model aimed at guiding search decisions in the solution space of complex problems to find optimal ***,Selective Attention Mechanism(SAM)is introduced to reduce the search space by adaptively focusing on the important information in the ***,Quantum Annealing(QA)algorithm with quantum tunneling effect is used to jump out of the local extremum in the search space with high probability and further approach the global optimal *** on the parking lot location dataset in Luohu District,Shenzhen,show that the proposed method has improved the accuracy and running speed of the solution,and the asymptotic optimality of the algorithm and its effectiveness in solving the public parking lot location problem are verified.

关键词： intuitive reasoning selective attention mechanism quantum annealing algorithm Quadratic Unconstrained Binary Optimization(QUBO)model parking lot location

Sedimentologic evidence for date of southward moving of the Yangtze River in the Jianghan Plain since the Holocene

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

Chinese Science Bulletin 1998年第8期43卷 659-662页

作者： Yuxin Zhu sumin wang Ruijin Wu Chinese Acad Sci Nanjing Inst Geog & Limnol Lake Sedimentat & Environm Lab Nanjing 210008 Peoples R China

The study of the sediment of Core M1 from Jianghan Plain suggests that the sediment source of this area changed in the Holocene, which corresponds with the south moving of the Yangtze River. Since then, the sediment s... 详细信息

关键词： southword moving of the Yangtze River dating sedimentologic evidence Holocene the Jianghan Plain.

Shaping the future of the application of quantum computing in intelligent transportation system

在线全文

学校读者我要写书评

暂无评论

Intelligent and Converged Networks 2021年第4期2卷 259-276页

作者： sumin wang Zhi Pei Chao wang Jie Wu Key Laboratory of Specialty Fiber Optics and Optical Access Networks Joint International Research Laboratory of Specialty Fiber Optics and Advanced CommunicationShanghai Institute for Advanced Communication and Data ScienceShanghai UniversityShanghai 200444China Department of Information Engineering Gannan University of Science and TechnologyGanzhou 341000China Department of Computer and Information Sciences Temple UniversityPhiladelphiaPA 19122USA

The intelligent transportation system(ITS)integrates a variety of advanced science and technology to support and monitor road traffic systems and accelerate the urbanization process of various *** paper analyzes the shortcomings of ITS,introduces the principle of quantum computing and the performance of universal quantum computer and special-purpose quantum computer,and shows how to use quantum advantages to improve the existing *** application of quantum computer in transportation field is reviewed from three application directions:path planning,transportation operation management,and transportation facility *** to the slow development of the current universal quantum computer,the D-Wave quantum machine is used as a breakthrough in the practical *** paper makes it clear that quantum computing is a powerful tool to promote the development of ITS,emphasizes the importance and necessity of introducing quantum computing into intelligent transportation,and discusses the possible development direction in the future.

关键词： quantum computing intelligent transportation quantum annealing D-wave quantum computer

The abundance,characteristics and diversity of microplastics in the South China Sea:Observation around three remote islands

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

Frontiers of Environmental Science & Engineering 2022年第1期16卷 117-128页

作者： Hongzhe Chen sumin wang Huige Guo Yunlong Huo Hui Lin Yuanbiao Zhang Third Institute of Oceanography Ministry of Natural ResourcesXiamen 361005China

Surrounded by emerging markets with considerable plastic consumption,the South China Sea has been a focus area of microplastic research.A survey on the floating microplastics(>0.3 mm)and microplastics ingested by fish and mollusks was conducted around three remote islands *** with the results from several previous studies,a high abundance of floating microplastics(with a median of 1.9×10^(5)items/km^(2) or 0.7 items/m^(3))was observed,revealing another“hot spot”for ***,especially polypropylene,was the main *** diversity index and evenness index were calculated and evaluated based on the composition of *** characteristic peaks of Raman spectra concerning pigmented microplastics were *** sheets/films were predominant in the water sample,which was quite different from a similar study in this sea area(8.9%for film),and only 16.4%of floating microplastics(>0.3 mm)were fibers/lines,implying that the main sources of floating microplastics(>0.3 mm)might be household/agricultural consumption *** transparent fiber/line was also dominant in *** is suggested that the main sources of microplastics ingested by organisms might be both fabric fibers and fishing/aquaculture.

关键词： Microplastics Coral reefs Abundance Diversity Characteristics

Inter-hemispheric comparison of climate change in thelast millennium based on the ECHO-G simulation

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2008年第17期53卷 2692-2700页

作者： KUANG XueYuan LIU Jian wang HongLi wang sumin State Key Laboratory of Lake Science and Environment Nanjing Institute of Geography and Limnology Chinese Academy of Sciences Nanjing 210008 China Guangxi Climate Center Nanning 530022 China

The commonality and difference in the variations of temperature and precipitation between the Northern Hemisphere (NH) and Southern Hemispheres (SH) in the last millennium are investigated by analysis of the millennium simulation with the ECHO-G coupled climate model. The NH mean temperature variations are generally consistent with those of the SH counterpart on the interannual, decadal and centennial time scales. But, the transition times between the medieval warm period (MWP), the little ice age (LIA), and the present-day warm period (PWP) in the NH leads that in the SH; and the anomaly amplitude in the NH is significantly larger than the SH counterpart. For the precipitation variations, the NH mean precipitation varies in-phase with the SH mean precipitation on decadal and centennial scales (mainly in the mid-high latitudes) but out-of-phase on the interannual scale (mainly in the low latitudes). During the MWP the warming has comparable amplitude in the NH and SH; however, during the PWP the NH warming is considerably stronger than the SH warming. Further, the present-day temperature rises in the NH high latitudes but decreases in the SH high latitudes, which is very different from the warming pattern during the MWP. Since during the MWP the greenhouse gases (GHG) concentration stayed at a low level, we infer that the present-day opposite temperature tendency in the high latitudes between the two hemispheres may be related to the increase of the GHG concentration.

关键词：气候变化中世纪温暖期一千年温度降水

Simulated analysis of summer climate on centennial time scale in eastern China during the last millennium

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2011年第21期56卷 2229-2235页

作者： wang HongLi LIU Jian wang ZhiYuan wang sumin KUANG XueYuan State Key Laboratory of Lake Science and Environment Nanjing Institute of Geography and LimnologyChinese Academy of SciencesNanjing 210008China Graduate University of Chinese Academy of Sciences Beijing 100049China School of Atmospheric Sciences Nanjing UniversityNanjing 210093China

Using Lanczos filtered simulation results from the ECHO-G coupled ocean-atmosphere model,this study analyzes the spatiotemporal structure of temperature and precipitation on centennial time scale to examine how climate change in eastern China responded to external forcing during the last *** conclusions are (1) eastern China experienced a warm-cold-warm climate transition,and the transition from the warm period to the cold period was slower than the cold to warm transition which followed *** was more rainfall in the warm periods,and the transitional peak and valley of precipitation lag those of *** effective solar radiation and solar irradiance have significant impacts on the temporal variation of both temperature and *** activity plays an important role in the sudden drop of temperature before the Present Warm Period (PWP).There is a positive correlation between precipitation and volcanic activity before 1400 A.D.,and a negative relationship between the two *** concentration of greenhouse gases increases in the PWP,and the temperature and precipitation increase accordingly.(2) The spatial pattern of the first leading empirical orthogonal function (EOF) mode of temperature on centennial time scale is consistent with that on the inter-annual/inter-decadal (IA-ID) time scales;namely,the entirety of eastern China is of the same *** pattern has good coherence with effective solar radiation and the concentrations of greenhouse *** first leading EOF mode of precipitation on centennial time scale is totally different from that on the IA-ID time *** first leading mode of centennial time scale changes consistently over the entirety of eastern China,while the middle and lower reaches of the Yangtze and Yellow Rivers are the opposite to the rest of eastern China is the leading spatial pattern on IA-ID time *** distribution of precipitation on centennial time scale is affected by solar irradiance

关键词：中国东部地区时间尺度夏季气候模拟分析温室气体浓度黄河中下游地区太阳辐射经验正交函数

Characteristics of an early Holocene climate and environment from lake sediments in Ebinur region, NW China

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2005年第2期48卷 258-265页

作者： WU Jinglu SHEN Ji wang sumin JIN Zhangdong YANG Xiangdong Nanjing Institute of Geography & Limnology Chinese Academy of SciencesNanjing210008China Nanjing Institute of Geography & LimnologyChinese Academy of SciencesNanjing210008China Nanjing Institute of Geography & LimnologyChinese Academy of SciencesNanjing210008China Nanjing Institute of Geography & LimnologyChinese Academy of SciencesNanjing210008China Nanjing Institute of Geography & LimnologyChinese Academy of SciencesNanjing210008China

The characteristics of climatic environment in the early Holocene epoch were studied through analyzing environmental proxies from the sediments in the Ebinur Lake--a closed one in the arid region. The pollen assemblage and other geochemical indices showed that, the temperature was somewhat low in the period (8.0-11.5 cal kaBP) as a whole, but in the early period (11.5-10.6 cal kaBP) the temperature was higher, in company with more precipitation. In the conversion period from the early Holocene epoch to the middle Holocene epoch (8.9-8.0 cal kaBP) the climate fluctuated remarkably. Particularly the three layers of peat sediment revealed the strong instability of climate in the early Holocene epoch in the Ebinur region. All information on the development of peat and the experimental data of pollen and stable isotopes implied that, the climatic condition at 8.2, 8.6 and 10.5 cal kaBP was characterized by noticeable cold and humidness, and could be regarded as three cold and humid events in the early Holocene epoch.

关键词： early Holocene epoch, climatic evolution, pollen assemblege, stable isotopic record, Ebinur Lake.