• 主题
高级搜索  >
历史搜索 清空历史
您现在的位置：首页> 中文期刊>基础科学>自然科学总论>自然科学进展（英文版）

自然科学进展（英文版）

自然科学进展（英文版）

CSCD

Progress in Natural Science Materials International
本刊是反映我国自然科学领域基础研究和应用基础研究成果的综合性学术期刊。刊登具有创造性、高水平、有重要意义的学术论文，国内外发行。
  • 发文量：2930
  • 被引量：431
  • H指数：1
  • 开始收录时间：
  • CNKI综合因子：
  • 维普期刊影响因子：
  • 万方期刊影响因子：0.17
  • 创刊时间：
  • 国内刊号/CN：11-3853/N
    国际刊号/ISSN：1002-0071
  • 发行周期：月刊
    邮发代号：
  • 主管单位：国家自然科学基金委员会杂志部
    主办单位：国家自然科学基金委员会
自然科学进展（英文版）-联系信息
  • 主编：师昌绪
  • 电话：010-68475052 010-68722032
  • 邮箱：maxm1213@163.com
  • 地址：
  • 邮编：100048
自然科学进展（英文版）-获奖情况
  • CA收录
  • SCISEARCH、Research
  • Alert和Current
  • Contents
  • Physical,Chemical
  • &
  • Earth
  • Sciences
更多>
  • 收录汇总
  • 刊内文献检索
  • 投稿信息

刊期浏览

相关中文期刊

相关中文会议

相关外文期刊

相关外文会议

最新期刊

热门期刊

自然科学进展（英文版） >2021年第5期

学科

年度

全选（0）
排序：
共4384条结果
  • 摘要：The 9-bp deletion in the COIl/tRNALys intergenic region (region V) of human mitochondrial DNA was screened in 1521 Chinese from 16 ethnic groups and 9 Han geographic groups. The highest frequency was found in populations of Miao (32.4%) and Bouyei (30.8%) from Guizhou Province, whereas no deletion was found in Kazak population in Xinjiang. In the populations of Wa and Lahu from Yunnan Province, Uygur and Mongolian from Xinjiang,the deletion frequency was relatively low ( ≤ 4 % ), while in the remaining 18 groups, the frequency was moderate (6 % ～ 24% ). Except those Hans in Xinjiang, Guizhou and that reported in Taiwan, the deletion frequency in the Han geo graphic groups did not show a substantial difference. However, the deletion frequency in some ethnic groups from the same geographic region or with similar ethnohistory did not show similarity. A general decrease tendency in the deletion rnfrequency was found from south to north and from coastal to inland. The frequency of the 9-bp deletion was approximate ly 17.20% in all Chinese we studied and reported elsewhere. Additionally, 4 individuals were found to carry the tripli cation of 9-bp segment in region V; one individual had X. II type of 9-bp deletion; and no other length polymorphisms were detected in this region in 27 randomly selected individuals with or without the deletion.
  • 摘要：Most continental sediments are composed of overlapped components, whose grain-size follows a type of distribution function. The components and the function type of a sample are determined on frequency and cumulative curves of grain-size distribution so as to designate the function formula. The function parameters can be estimated by fit ting designated function to measured grain-sized data of the sample, which simultaneously achieves numerical partitioning of the components. Genetic analysis of hydraulic and aeolian sediments demonstrates the following environmental implirncations. Fluvial sediment is composed of isolated saltation and suspension component. The sediment in drainage closed lakes is dominated by suspension silt-clay component, with little portion of saltatory sand. Fine sand conponent makes up a majority of desert sand overlapped with small portion of fine dust. Loess is composed of overlapped short-suspending silt component and long-suspension fine component. Long-suspension fine dust is the unique component of deep-sea aeo lian sediment. The fine component shows constant grain-size distribution and genetic connection from desert sand, loess of Northern China to Northern Pacific Ocean, which is transported mainly by westerly stream and dispersed in whole rnstratosphere to form the background dust.
  • 摘要：The estimate of Hausdorff measure H' (F) of Sierpinski carpet F with Hausdorff dimension s =logS/log3 is derived as Hs(F)≤55102s--864855992=1.089147….
  • 摘要：The most recent research progress in the fields of the crystal structure and magnetochemistry for rare earth-transition metal cyano-bridged complexes is reviewed in detail. The emphasis is put on the introduction to the research achievements of our group in this field, including all the types of complexes with different crystal structures in these systems such as dinuclear, trinuclear, one-dimensional chain and hydrogen-bonded network ion-pairs. At the same time a few examples of rare earth-transition metal molecular-based magnets have been found to exhibit excellent magnetochemical properties, such as the long-range magnetic ordering, the higher critical temperature Tc and the stronger coercive force. These results will be expected to promote the research development in this field.
  • 摘要：Magnetic refrigeration has drawn much attention because of its greater efficiency and higher reliability than the traditional gas-cycle refrigeration technology. Recently, a kind of new materials with a giant magnetocaloric effect in the subroom temperature range, Gd5 (Six Ge1- x)4, was discovered, which boosts the search for high-performance magnetic refrigerants. However, the intermetallic compounds Gd5 (SixGe1 - x )4 belong to the first order transition materials; their performance in practical magnetic refrigeration cycles remains controversial. In this paper the developing tendency of the refrigerants are discussed on the basis of our work.
  • 摘要：The random amplified polymorphic DNA analysis was used to estimate genetic diversity in one successively cultivated stock and three wild stocks of Penaeus chinensis shrimp, two of which were collected from the spawning and wintering grounds in the west coast of Korean Peninsula, and one from the feeding ground in the China coast of the Yellow Sea. A random primer kit was employed to scan the genomic DNA in 20 individuals of each index stock. A total of 110 reproducible RAPD markers were obtained, 68.2 % of which showed a sound eonformability within all the individuals detected, implying that the genetic variability in P. chinensis is relatively low. The proportions of polymorphic loci among these four stocks ranged from 20% to 33.3%, while the degrees of genetic polymorphisms varied from 0.0093 to 0.0307. The genetic variability of inter-stocks was higher than that of intra-stock. The genetic diversity in different stocks differed from each other; that is, a less genetic differentiation in the spawning and wintering stocks from the west coast of Korean Peninsula was revealed and their genetic diversities were higher than that of the spawning stock in the Bohai Sea and the China coast of the Yellow Sea. As detected, the genetic diversity in the successively cultivated stock was the lowest among these four stocks. Through genetic distance analysis between a random pair of individuals, a dendrogram of the above-mentioned four stocks was constructed by unweighted pair group method with arithmetic mean. The results based on cluster analysis well fitted with the geographical distribution of P. chinensis in the Bohai and Yellow Seas.
  • 摘要：Under high energy impact contact loading, a turning on the weight loss－impact cycle (WL-N) curv e has been found, which results from the formation of nano-sized grains embedded in amorphous in the surface layersof Hadfield steel. As the impact energy increases, the wear rate, d WL/dN, first increases then decreases. The nanostructure due to the accumulation of plastic deformation is composed of nano-sized grains spanning 10 ～ 50 atoms and amorphous structures.
  • 摘要：C60 single crystals larger than one centimeter in size are grown with vapor method by nucleation control and by a proper time-dependent temperature process which allows only one nucleus growing larger and larger. X-ray diffraction patterns exhibit the high quality of the sample. As an example of the applications of large single C60 crystals,svnchrotron radiation photoemission spectra are measured to investigate the fine structure of valence bands of C60 crystals.
  • 摘要：For the two fourth-order polynomials a ( s ) and b ( s ), the Hurrwitz stability of their convex combina tion is necessary and snfficient for the existence of a polynomial c (s) such that c ( s ) / a ( s ) and c ( s ) / b ( s ) are both strictly positive real.
  • 摘要：The support properties of the super Brownian motion with random immigration Xρ1 are considered,where the immigration rate is governed by the trajectory of another super-Brownian motion ρ. When both the initial state Xρo of the process and the immigration rate process ρo are of finite measure and with compact supports, the probability of the support of the process Xρi dominated by a ball is given by the solutions of a singular elliptic boundary value problem.
  • 摘要：Through the comparative analysis of primary freshwater fishes in Chinese continent and the Taiwan Island, we summarize the three distinctions of distribution of freshwater fishes in these areas: (i) there exists a high similarity of freshwater fish fauna between Taiwan and the southeastern shore of the continent; (ii) some species of freshwater fish are found both in the Taiwan Island and East Himalayans; (iii) different freshwater fishes have different distributions in island arch of western Pacific where Taiwan is located, but the distribution pattern shows a similarity to that of adjacent continent. The characteristic distributions of the fishes are closely related to the change in paleogeography and geology in the area. The parsimony analysis of endemicity (PAE analysis) indicates that the three distribution patterns can be explained by the vicariance theory.
  • 摘要：The relationship between the magnitude of singular value and nonlinear stability or instability of the basic flow is investigated. The results show that there is a good corresponding relationship between them. The magnitude of singular value decreases as the stability (or instability) of the basic flow increases (or decreases). In the stable case, the magnitude of the maximum singular value is much smaller than in the unstable case.
  • 摘要：The high quality ZnO: A1 films were successfully produced by DC reaction magnetron sputtering technology. The Al-doping effect on electrical and optical properties and its scattering mechanism are discussed in detail. The analyses of X-ray diffractometer (XRD), X-ray photoelectron spectroscopy(XPS) and high resolution Auger electron spectroscopy (AES) show that Al2O3 could be effectively removed by controlling oxygen flow and Al-doping concentration during deposition of ZnO: Al films. Zn, Al and oxygen elements are well distributed through the films. For highly degenerated ZnO:A1 semi-conductive thin films, the theoretical and experimental results reveal that the ionized impurity. scattering dominates the Hall mobility in the films in the low-temperature range, while the lattice vibration scattering becomes a major scattering mechanism in the high-temperature range. The grain boundary scattering only plays a major role in the ZAO films with small grain size (as compared to the electron mean free path). The photoelectric properties of ZAO films show that it has low resistivity ( ～ 5 × 10-4 Ωcm), and the transmittance in visible range and the reflectance in IR region are above 80% and 60%, respectively.
  • 摘要：The purpose of digital image scrambling is to transforn a given digital image into a rather scrambled one so as to make it difficult for other people to find out the true meaning of the scrambled image. This paper comes up with a certain number of approaches to scrambling digital images, which, when thus processed, cannot be reconstructed in a common way. As a result, the original image is enc yrypted and protected.
  • 摘要：The approaches to characterizing the surface topography of a rock joint can be simply grouped into statistical approaches and fractal geometrical approaches. This paper reviews the developments in characterization of the surface topography of a rock joint. Moreover, several problems of the current researches are also discussed.
  • 摘要：A laser heater has been used to impose a pulsed high power laser beam on a metal film inunersed in liquid to generate a very high rate of temperature rise up to 9.3 × 106K/s in the metal film. The rapid transient boiling phenomena have been observed and the temperature variations in the metal film have been measured. Theoretical calculations have been carried out with the fluctuation nucleation theory and the heat conduction theory to compare with the experimental results, and some results are reported.
  • 摘要：The periodicity of a general matrix modular transformation is discussed, and a simple proof of a sufficient and necessary condition that a matrix transformation has periodicity is given. Using a block matrix method, the higher dimensional transformation and its inverse are studied, and a simple algorithm for calculating their periods is put forward. The security of n-dimensional Amold transformation and its inverse is also discussed. The results show that the two transformations are applicable in scrambling and recovering images.
  • 摘要：Let an n≥1 be a sequence of conplex numbers such that Considering the generalized complex valued Rademacher series and its level sets Ea = x∈0,1: R(x) = a ( a∈7). we prove that dimHEa = 1 for any a∈ . where dimH is the Hausdorff dimension
  • 摘要：Wolbachia are a group of Rickettsia-like bacteria which parasitize the cells of a wide range of anthropoid. These microorganisms are associated with the reproductive and developmental abnormalities io their hosts. To study the molecular mechanism underlying such phenomena, we analyzed the genomic difference between Wolbachia with different cytoplasmic incompatibility (CI) phenotype using representational difference analysis method. A potential transposable element, which exists in the strong CI-inducing strain wRi, was isolated. This element was designated as Wolbachia insertion sequence element (WISE).
  • 摘要：Neural stem cells are a pronising candidate for neural transplantation aimed at neural cell replacement and repair of the damaged host central nervous system (CNS). Recent studies using neural stem cells have shown that implanted neural stem cells can effectively incorporate into the damaged CNS and differentiate into neurons, astrocytes, and oligodendrocytes. The recent explosion in the field of neural stem cell research has provided insight into the inductive factors influencing neural stem cell differentiation and may yield potential therapies for several neurological disorders, including spinal cord injury. In this review, we summarize recent studies involving neural stem cell biology in both rodents and humans. We also discuss unique advantages and possible mechanisms of using neural stem cell trans plantation in the repair of spinal cord injury.
  • 摘要：One class of generalized Ginzburg-Landau equation is studied and the existence of almost periodic solution of the equation is proven when f( t, x) is an almost periodic function of time t.
  • 摘要：A new kind of artificial abzyme MIP-3, which contains N-phenyl benzonic amide group and “nanochannel” formed by embedded ZnO nano materials, and is imprinted by a transition-state analogue of p-nitrophenyl methyphosphonate in the hydrolysis of p-nitrophenyl acetate, was prepared by radical co-polymerization. Hydrolytic kinetics of p-nitrophenyl carboxylate catalyzed by MIP-3 was investigated. The results showed that the artificial abzyme exhibited notable substructure selectivity and strong catalytic ability in hydrolysis of p-nitrophenyl acetate
  • 摘要：A 50 m firn core drilled in Princess Elizabeth Land, Antarctica, during the 1996/1997 Chinese First Antarctic Inland Expedition, has been measured for б18O and major ions. Based on these data, the features of the climate change in the investigated region in the past 250 years have first been studied. In the past 250 years, the change trend of climate in this region can be divided into two periods by the year 1860. Both the temperature and accumulation rate display increasing trend before 1860, while after 1860, the decreasing trend of the temperature is obvious but the change of the accumulation rate is not clear. Although both the temperature and the accumulation rate are increasing in the past 50 years, they are not the highest values in the past 250 years. So it is clear that the climate change in this region during this period does not reflect recent global wanning.
  • 摘要：The uniformity of two pairs of color spaces based on CIE 1997 color appearance model (CIECAM97s) is analyzed according to color-discrimination ellipses that are constructed using color-difference evaluation data. A new uniform color space named Jucs a ucs b ucs is deduced by re-scaling the coordinates of lightness, redness-greenness and vellowness-blueness in two initial color spaces using linear regression method. The uniformity of the new color space is obviously improved compared with the initial color spaces.
  • 摘要：The N beam-mediated distant molecular hybridization between Ginkgo biloba I and watermelon was studied. The results showed that the ester gene of Ginkgo biloba L was successfully expressed in two varieties of watermelon. 3-16 and SR2-14-2, in both of which the ester quantities were measured as 17.0756 μg/g and 45.9998 μg/g respectively. Meanwhile, superoxide dismutase (SOD) activity in leaves of the watennelon expressing ester gene was increased twofold as compared to that of the control, showing that ion beam could mediate distant and/or super-distant donor gene expression in the cells of a receptor. Furthermore, the molecular nechanism of distant hybridization was analyzed.
  • 摘要：The effect of alloying elements on the environmental embrittlement of L12 type intermetallics is sumrnmarized. The results show that the ductilizing effect of boron doping in Ni3A1 is mainly to suppress the moisture-induced rnenvironmental embrittlement. The mechanism of this suppression effect is proved to lie in the fact that it severely reduces rnthe hydrogen diffusivity along the grain boundaries. However, the boron doping in Co3Ti alloys does not have the same rneffect of suppressing the environmental embrittlement. The different behavior of boron doping in Ni3A1 and Co3Ti may be rnattributed to its different segregation behavior on the grain boundaries. Boron in Co3Ti does not segregate on the grain rnboundaries and cannot effectively reduce the hydrogen diffusivity along the grain boundaries. The moisture-induced envirnronmental embrittlement of Co3Ti alloy can be completely suppressed by the addition of Fe. As proved by Auger, this rnsuppression effect is due to its obvious reduction of the surface kinetic reaction with water vapor.
  • 摘要：Chinese “Xue Long” breaker made its first voyage to the Arctic Ocean for scientific expedition from rnJuly to September, 1999. The tethersonde meteorological tower (TMT) sounding system was used to probe the rntemperature, humidity, air pressure, wind direction and wind speed on different underlying surfaces above the Arctic rnOcean. The probed data were used for calculating the roughness length z0, momentum flux M, drag coefficient CDD,rnsensible heat flux Hss, bulk transfer coefficient CHH for sensible heat, latent heat flux HLL, and bulk transfer coefficient rnCEE for latent heat of air-ice-sea on different underlying surfaces. They vary within the ranges of (0.2 ～ 1.0) mm,rn(1.14～9.19) ×10-2N/m2, (0.87～ 1.76) × 10-3,-(4.2～ 12.5) W/m2, (0.84～ 1.37) x 10-3,-6.6～rn23.6 W/m2 and (0.85 ～ 1.40) x 10-3, respectively. It shows that the drag coefficient is greater than the latent heat rntransfer coefficient, and again the latent heat transfer coefficient is larger than the sensible heat transfer coefficient.rnBesides, the fluxes of momentum, sensible and latent heat are apparently correlated to the mean wind speed and the rnmean potential temperature difference and mean specific humidity difference.
  • 摘要：Using electron microscopy, NAMA-Ur DNA selective staining and BrUTP incorporation, the nucleornlus ultrastructure, the distribution of DNA and the rRNA transcription sites in nucleolus of G2 phase Physarum polyrncephalum were studied. The nucleolus was found to be different in structure from that of other plant cells. Fibrillar cenrntern (FCs) were present in a large amount all over the nucleolus. DNA was distributed both in dense fibrillar components rn(DFC) and in FC. The DNA in the nucleolus was less condensed than that of the chromosome territory. These changes rnsuggested that the transcription was active within the nucleolus. BrUTP incorporation localized the rRNA transcription in rnDFC and at the interface of FC and DFC, suggesting that the DNA in FC is in a storage form and only the rDNA in DFC rnis transcribed.
  • 摘要：The bifunctional enzvme 6-phosphofructo-2-kinase/fructose-2,6-bisphosphatase consists of two disrntinct domains which catalyze the synthesis and hydrolysis of fructose-2, 6-bisphosphate, respectively. In this work the rnproperties of the separate 6-phosphofructo-2-kinase domain were investigated. Purification of the expressed separate dornmain or isolation of this domain from purified glutathione S-transferase (GST) fusion protein with thrombin cleavage led rnto the loss of its kinase activity. Thus the domain in the GST-tagged form was characterized. The two forms of the dornmain with different lengths (amino acids 1 ～ 249 and 1 ～ 286) were very similar in kinetic property and could catalyze rnthe formation of fructose-2,6-bisphosphate with a kcat 4-fold lower than that of the full-length enzyme. In addition, the rndomain was much more sensitive to guanidine inactivation and heat denaturation, and less stable at pH values below 7rnthan the full-length enzyme. The results suggest that the separate kinase domain of the bifunctional enzyme is far less rnperfect in structure in the absence of the bisphosphatase domain, though it still possesses the 6-phosphofructo-2-kinase rnactivity.
  • 摘要：This paper presents a comprehensive methodology to determine the servomotor parameters of a paralrnlel kinematic machine according to the design specifications in terms of the cutting load, fast feed rate and accelerating rncapabilities. Due to the characteristics of the parallel format, the singular value decomposition technique is employed to rndetermine the lower and upper bounds of the servomotor parameters such as the rated speed and torque. An approach is rnalso developed to determine the maximum equivalent moment of inertia of the platform and struts reduced onto a servo axrnis, which therefore allows the accelerating capability of the servo system to be examined in terms of the maximum torque rnrequired. The effectiveness of this methodology is exemplified by the application to a tripod-based parallel kinematic marnchine for high-speed milling.

    自然科学进展（英文版）的期刊信息

    • 曾用名：自然科学进展（英文版）
    • 创刊时间：
    • 地区：
    • 语言：中文
    • 热门主题：
    • 学科分类：

    自然科学进展（英文版）的获奖情况

    • CA收录
    • SCISEARCH、Research
    • Alert和Current
    • Contents
    • Physical,Chemical
    • &
    • Earth
    • Sciences

    自然科学进展（英文版）的收录情况

    • 美国《科学引文索引》 (2019)
    • 美国《科学引文索引》 (2016)
    • 美国《科学引文索引》 (2014)
    • 美国《科学引文索引》 (2013)
    • 美国《科学引文索引》 (2008)

    自然科学进展（英文版）的投稿信息

    • 投稿方式：
    • 投稿须知：点击查看
    • 期刊官方网站：点击前往
    • 版面费：
    • 审稿费：元
    • 通讯地址：
    • 邮编：100048
    • 联系电话：010-68475052 010-68722032
    • 邮箱：maxm1213@163.com
    • 期刊栏目：专题评述;学术论文;研究简讯;学术论坛;实验室通讯
    免费订阅本刊

    客服邮箱：kefu@zhangqiaokeyan.com

    京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有 出版物经营许可证

    • 客服微信

    • 服务号