|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Symmetric-key cryptosystem with DNA technology显示文摘DNA cryptography is a new field which has emerged with progress in the research of DNA computing. In our study, a symmetric-key cryptosystem was designed by applying a modern DNA biotechnology, microarray, into cryptographic technologies. This is referred to as DNA symmetric-key cryptosystem (DNASC). In DNASC, both encryption and decryption keys are formed by DNA probes, while its ciphertext is embedded in a specially designed DNA chip (microarray). The security of this system is mainly rooted in difficult biology processes and problems, rather than conventional computing technology, thus it is unaffected by changes from the attack of the coming quantum computer. The encryption process is a fabrication of a specially designed DNA chip and the decryption process is the DNA hybridization. In DNASC, billions of DNA probes are hybridized and identified at the same time, thus the decryption process is conducted in a massive, parallel way. The great potential in vast parallelism computation and the extraordinary information density of DNA are displayed in DNASC to some degree. | LU MingXin1,2*, LAI XueJia3*, XIAO GuoZhen4,2 & QIN Lei5 1 Department of Information Management, Nanjing University, Nanjing 210093, China 2 State Key Lab of Information Security, Institute of Software of Chinese Academy of Science, Beijing 100049, China 3 Department of Computer Science & Engineer, Shanghai Jiao Tong University, Shanghai 200030, China 4 State Key Lab of ISN, Xidian University, Xi’an 710071, China 5 Cancer Research Institute, Queen’s University, Kingston, Ontario, K7L3N6, Canada | 2007 | Science in China(Series F)2007，50，3： | 14 |
| 2 | Revisiting the origin of modern humans in China and its implications for global human evolution显示文摘The debates over the origin of modern humans have long been centered on two competing theories:the 'Out-of-Africa'(single-place origin) theory and the 'Multi-regional Evolution' theory.China is an extremely important region where many ancient human fossils were collected along with numerous associated faunal remains and artefacts.These cultural remains,unearthed from different areas in the country and covering a long time span,will help clarify the controversy.The study of cultural materials in China is expected to shed important light on biological evolutionary patterns and social and technical developments of those early humans as well as their environmental conditions.Based on the analysis of Chinese fossils and associated materials,in conjunction with some genetic studies,this paper aims at evaluating each of the two theories in order to stimulate more discussions.Our study suggests that the evolutionary model of 'Continuity with Hybridization' is most relevant in reflecting the current understanding of human evolutionary history in China.Furthermore,we propose that the concept of regional diversity of evolutionary models should be seriously considered to illustrate different evolutionary modes applied to different parts of the world. | GAO Xing1,2*,ZHANG XiaoLing1,2,3,YANG DongYa2,4,SHEN Chen2,5 & WU XinZhi1,2 1 Institute of Vertebrate Paleontology and Paleoanthropology,Chinese Academy of Sciences,Beijing 100044,China 2 Laboratory of Human Evolution,Chinese Academy of Sciences,Beijing 100044,China 3 Graduate University of Chinese Academy of Sciences,Beijing 100049,China 4 Department of Archaeology,Simon Fraser University,Vancouver V5A 1S6,Canada 5 The Royal Ontario Museum,Toronto M5S 2C6,Canada | 2010 | Science China Earth Sciences2010，53，12： | 11 |
| 3 | Multifractal modelling and spectrum analysis: Methods and applications to gamma ray spectrometer data from southwestern Nova Scotia, Canada显示文摘Multifractal spectrum, autocorrelation/semivariogram and power spectrum are three dif- ferent functions characterizing a field or measure from different aspects. These functions are interre- lated in such that the autocorrelation/semivariogram and power spectrum are related to the low order statistical moments (0 to 2 nd) which may determine the local multifractality (τ ″(1)) of a multifractal measure. A better understanding of the interrelationships among these three functions is important because, on one hand, the multifractal modelling characterizes a multifractal measure in a more de- tailed manner since it involves moments of all orders. On the other hand, the commonly used semivariogram and power spectrum functions can be used as alternatives to study the dominant mul- tifractal properties around the mean measure. Moreover, semivariogram and power-spectrum func- tions provide spatial and spectral information, which is highly valued in geological applications. A new fractal relation found between area and power-spectrum will be useful for investigation of new meth- ods of spatial-spectral analysis for pattern recognition, anomaly separation, classification, etc. These results have been demonstrated with the case study of modelling gamma ray spectrometer data from the mineral district, southwestern Nova Scotia, Canada. The results have shown that the values of uranium (U), thorium (Th) and potassium (K) may possess monofractal properties whereas the ratios of these values show high multifractality. The values of the ratios U/K and U/Th show relatively large variances and may provide more information for distinguishing the distinct phases of the granites, country rocks as well as possible gold mineralization-associated regional hydrothermal alteration zones. In addition, the power spectra for U, Th, K, U/Th and U/K consistently show two distinct power-law relationships for two ranges of wave number 12≤ω ≤160 km and 0≤ω ≤12 km. These properties might provide useful thresholds for separating the power-spectrum values into two types of patterns to reflect different influences of possible geological processes such as hydrothermal altera- tion in the study area. | CHENG Qiuming1,2 1. State Key Lab of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China 2. Department of Earth and Space Science and Engineering, Department of Geography, York University, 4700 Keele Street, Toronto, Ontario, M3J 1P3, Canada | 2006 | Science China Earth Sciences2006，49，3： | 8 |
| 4 | Selection of Multifractal Scaling Breaks andSeparation of Geochemical andGeophysical Anomaly显示文摘Spatially superimposed multiple processes such as multiplicative cascade processes often generate multifractal measures possessing so-called self-similarity or self-affinity that can be described by power- law type of functions within certain scale ranges The multifractalities can be estimated by applying multifractal modeling to the measures reflecting the characteristics of the physical processes such as the element concentration values analyzed in rock and soil samples and caused by the underlying mineralization processes and the other geological processes. The local and regional geological processes may result in geochemical patterns with distinct multifractalities as wall as variable scaling ranges. Separation of these multifractal measures on the basis of both the distinct multifractalities and the scaling ranges will be significant for both theoretical studies of multifractal modeling and its applications. Multifractal scaling breaks have been observed from various multifractal patterns. This paper introduces a technique for separating multifractal measures on the basis of scaling breaks. It has been demonstrated that the method is effective for decomposing geochemical and geophysical anomalies required for mineral exploration. A dataset containing the element concentration values of potassium and phosphorus in soil samples was employed for demonstrating the application of the method for studying the fertilizer and yield optimization in | Cheng Qiuming Department of Earth and Atmospheric Science, Department of Geography, York University, Toronto, Ontario, Canada, M3J 1P3 | 2001 | Journal of China University of Geosciences2001，12，1： | 7 |
| 5 | Fractal Correction of Well Logging Curves显示文摘It is always significant for assessing and evaluation of oil bearing layers, especially for well logging data processing and interpretation of non marine oil beds to get more accurate physical properties in thin and inter thin layers. This paper presents a definition of measures and the measure presents power law relation with the corresponded scale described by fractal theory. Thus, logging curves can be reconstructed according to this power law relation. This method uses the local structure nearby concurrent points to compensate the average effect of logging probes and measurement errors. As an example, deep and medium induced conductivity (IMPH and IDPH) curves in ODP Leg 127 Hole 797C are reconstructed or corrected. Corrected curves are with less adjacent effects through comparison of corrected curves with original one. And also, the power spectra of corrected well logging curve are abounding with more resolution components than the original one. Thus, fractal correction method makes the well logging more resoluble for thin beds. | Li Qingmou Cheng Qiuming Institute of Geology & Geophysics, Chinese Academy of Sciences, Beijing 100101 Department of Earth and Atmospheric Science, York University, Toronto, Ontario, Canada, M3J 1P3 | 2001 | Journal of China University of Geosciences2001，12，3： | 5 |
| 6 | Impaired auditory sensorimotor gating: An animal model of schizophrenia显示文摘Establishment of animal models of schizophrenia is critical for both understanding the mechanisms underlying this severe mental disease and developing new antipsychotics. This paper starts from the theoretical root of sensory gating, the 損rotection-of-processing?theory, then thoroughly describes the representative studies over the past decade on the mechanism underlying prepulse inhibition and on those underlying modulation of prepulse inhibition, which is the normal startle suppression caused by the weak stimulus preceding the intense startling stimulus. The main methods for inducing prepulse inhibition deficits in experimental animals include: ⅰ) modulations of neuro- transmission that are closely associated with schizophrenia; ⅱ) focal lesions or pharmacological manipulations of brain structures in the cortico-striato-pallido-pontine circuit; and ⅲ) maternal deprivation or social isolation. Six essential topics for studies in modeling schizophrenia are suggested at the last part of this review. | LI Liang & SHAO Feng 1. Department of Psychology, Peking University, Beijing 100871, China 2. Centre for Research on Biological Communication Systems, University of Toronto at Mississauga, Mississauga, Ontario L5L 1C6, Canada | 2003 | Chinese Science Bulletin2003，48，19： | 5 |
| 7 | Use-wear analysis confirms the use of Palaeolithic bone tools by the Lingjing Xuchang early human显示文摘During 2007-2008 excavations at the Lingjing site near Xuchang,Henan Province,dated back to around 100-80 ka ago,a large quantity of mammalian fossil remains were recovered along with a remarkable cluster of Early Modern Human(EMH) skull fragments in situ.Observably some of those animal bones were probably modified into tools.A use-wear analysis was carried out to examine the functions of modified bone tools.The results suggest that Lingjing bone tools were used for drilling,penetrating,and scraping animal substances,and that some might have been hafted during the use.This study confirms that early existence ofintentionally-modified bone tools at human occupations of the early Late Pleistocene in northern China.This discovery suggests making and use of bone tools were inevitably a part of early human behaviors and cultural development,as such of stone tools. | LI ZhanYang 1,4 & SHEN Chen 2,3,4 1 Henan Provincial Institute of Cultural Relics and Archaeology,Zhengzhou 450000,China 2 The Joint Laboratory of Human Evolution and Archaeometry,Chinese Academy of Sciences,Beijing 100044,China 3 The Royal Ontario Museum,Toronto ON M5S2C6,Canada 4 Oriental Archaeology Research Center of Shandong University,Jinan 250100,China | 2010 | Chinese Science Bulletin2010，55，21： | 4 |
| 8 | Mineralogical Zonation of Wall-Rock Alteration in Jiaodong Gold Province, North China显示文摘MININGHISTORYGeographicalytheJiaodonggoldprovincecoversalmostthewholeShandongorJiaodongPeninsula,theeasternhalfoftheShandongP... | Chen Guangyuan Sun Daisheng Shao Wei Li Shengrong Division of Genetic Mineralogy, China University of Geosciences, Beijing 100083 Fyfe S. William Department of Earth Sciences, University of Western Ontario, London, Ontario, Canada, N6A 5B7 Chen | 1999 | Journal of Earth Science1999，18，1： | 3 |
| 9 | A Diagnostic Study of Moist Potential Vorticity Generation in an Extratropical Cyclone显示文摘ADiagnosticStudyofMoistPotentialVorticityGenerationinanExtratropicalCyclone①ZuohaoCaoandG.W.K.MoreDepartmentofPhysics,Univers... | Zuohao Cao and G.W.K. Moore Department of Physics, University of Toronto, Toronto, Ontario, Canada, M5S 1A7 | 1998 | Advances in Atmospheric Sciences1998，15，2： | 3 |
| 10 | Simulating global soil-CO_2 flux and its response to climate change显示文摘It has been argued that increased soil respiration would become a major atmospheric source of CO\-2 in the event of global warming. The simple statistical models were developed based on a georeferenced database with 0 5°×0 5° longitude/latitude resolution to simulate global soil\|CO\-2 fluxes, to investigate climatic effects on these fluxes using sensitivity experiments, and to assess possible responses of soil\|CO\-2 fluxes to various climate change scenarios. The statistical models yield a value of 69 PgC/a of global soil\|CO\-2 fluxes for current condition. Sensitivity experiments confirm that the fluxes are responsive to changes in temperature, precipitation and actual evapotranspiration, but increases in temperature and actual evapotranspiration affect soil\|CO 2 fluxes more than increases in precipitation. Using climatic change projections from four global circulation models, each corresponding to an equilibrium doubling of CO 2, it can be found that the largest increases in soil\|CO 2 fluxes were associated with the boreal and tundra regions. The globally averaged soil\|CO 2 fluxes were estimated to increase by about 35% above current values, providing a positive feedback to the greenhouse effect. | PENG Chang\|hui 1* , Michael J. Apps\+2 (1 Ontario Forest Research Institute, Ministry of Natural Resources, 1235 Queen Street East, Sault Ste. Marie, ON P6A 2E5,Canada. E\|mail: pengc@gov.on.ca 2 Morthern Forestry Center, Canadian Forest Serv | 2000 | Journal of Environmental Sciences2000，12，3： | 2 |
| 11 | Geochemical and Geophysical Data Processing Aided by“Multifractal-Spectrum”Filters for GIS-Based Mineral Exploration显示文摘A recently developed method, on the bases of “multifractal spectrum” filters for mineral exploration, is introduced in this paper. The “multifractal spectrum” filters, a group of irregularly shaped filters that are constructed on each processed datum, can be used to separate various types of geochemical and geophysical anomalies. The basic model, with an emphasis on the GIS based implementation and the application to the geochemical and geophysical data processing for mineral exploration in southern Nova Scotia, Canada, indicates its advantage in the separation of multiple anomalies from the background. | Xu Yaguang Cheng Qiuming Department of Earth and Atmospheric Science, York University, North York, Ontario, M3j 1P3 Canada | 2000 | Journal of Earth Science2000，19，2： | 2 |
| 12 | Modified High-order Upwind Method for Convection Diffusion Equation显示文摘Abstract In this paper, we study the high-order upwind finite difference method for steady convection-diffusionproblems. Based on the conservative convection-diffusion equation, a high-order upwind finite difference schemeon nonuniform rectangular partition for convection-diffusion equation is proposed. The proposed scheme is inconversation form, satisfies maximum value principle and has second-order error estimates in discrete H^1 norm.To illustrate our conclusion, several numerical examples are given. | Wei-dong ZHAO, Dong LIANGSchool of Mathematics and System Sciences, Shandong University, Jinan 250100, ChinaDepartment of Mathematics and Statistics, York University, 4700 Keele Street, Toronto, Ontario, M3J 1P3, Canada | 2002 | Acta Mathematicae Applicatae Sinica2002，18，1： | 2 |
| 13 | 地球科学新的优先考虑的问题:自然科学、工程学、经济学的联合和知识发展的必要性显示文摘文章从分析生命支持系统的基本组成着手,指出愈来愈多的人类活动促使大气中CO2、CH4、H2O、N2O…含量不断增加,气候变暖;水资源危机愈加严重;对土壤产出的要求越来越高;地质灾害对人类自身的冲击更加严重;能源和原材料更大程度的短缺;废物的排放量增大及生物变异等新问题和生物种类的新发现。对上述现象的深入研究或解决,均是地球科学优先和急于考虑的问题。而这需要大批高素质,既具自然科学、工程学、经济学,又具管理知识的人才,因而这些优先考虑问题的重中之重是教育。 | W.S.Fyfe(Department of Earth Sciences University of Western Ontario London,Ontario,Canada N6A 5B7) | 1996 | 地学前缘1996，3，1： | 2 |
| 14 | Numerically quantifying the relative importance of topography and buoyancy in driving groundwater flow显示文摘Both topography and buoyancy can drive groundwater flow;however,the interactions between them are still poorly understood.In this paper,the authors conduct numerical simulations of variable-density fluid flow and heat transport to quantify their relative importance.The finite element modeling experiments on a 2-D conceptual model reveal that the pattern of groundwater flow depends largely upon the relative magnitude of the flow rate due to topography alone and the flow rate due to buoyancy alone.When fluid velocity due to topography is greater than that due to buoyancy at large water table gradients,topography-driven 'forced convection' overwhelms buoyancy-driven 'free convection'.When flow velocity due to buoyancy is greater than that due to topography at small water table gradients,mixed free and forced convection takes place.In this case,free convection becomes dominant,but topography-driven flow still plays an important role since it pushes the free convection cells to migrate laterally in the downhill direction.Consequently,hydrothermal fluid flow remains changing periodically with time and no steady state can be reached.The presence of a low-permeability layer near the surface helps eliminate the topography effect on the underlying free convection. | YANG JianWen 1,2,FENG ZuoHai 1,LUO XianRong 1 & CHEN YuanRong 1 1 Faculty of Earth Sciences,Guilin University of Technology,Guilin 541004,China 2 Department of Earth and Environmental Sciences,University of Windsor,Windsor,Ontario,N9B 3P4,Canada | 2010 | Science China Earth Sciences2010，53，1： | 2 |
| 15 | In-home care for optimizing chronic disease ma- nagemcm in the community:an evidence-based analysis 显示文摘 | Health Quality Ontario | 2013 | Ont Health Teehnol Assess Ser2013，13，5： | 1 |
| 16 | Lifting of transmission towers under live line conditions显示文摘 | Skelton H E Ontario H Orde C I | 1982 | IEEE Transactions on Power Apparatus and Systems1982，101，9： | 1 |
| 17 | Screening and management of de- pression for adults with chronic diseases: an evidence - based analysis 显示文摘 | Health Quality Ontario | 2013 | Ont Health Technol Assess Ser2013，3，8： | 1 |
| 18 | Fecal occult blood test for colorectal cancer screening: an evidence-based analysis显示文摘 | Health Quality Ontario | 2009 | Ont Health Technol Assess Ser2009，9，： | 1 |
| 19 | Caregiver - and patient - directed interventions for dementia: an evidence -based analysis 显示文摘 | Health Quality Ontario | 2005 | Ont Health Technol Assess Ser2005，8，4： | 1 |
| 20 | Network analysis of ground currents in a residential distribution system 显示文摘 | Mader D L Ontario Hydro Zaffanetla L E | 1993 | IEEE Transactions on Power Delivery1993，8，1： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员