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| 1 | A new ent-atis-16-ene type diterpenol from Euphorbia sieboldiana显示文摘From the acetone extract of the root of Euphorbia sieboldiana,a new ent-atis-16-ene typediterpenol was isolated and its structure was demonstrated as ent-atis-16-ene-13 α-hydroxy-3,14-dione(1)based on the chemical as well as NMR and MS spectroscopic evidences,and finally confirmed by X-ray diffraction, | DING,Yi-Li JIA,Zhong-Jian WANG,Qi-Guang CHEN,Ji-Hong LIU,Yu-Ting Institute of Organic Chemistry,Lanzhou University,Lanzhou 730000 Department of Chemistry,Xingjiang University. | 1991 | Chinese Journal of Chemistry1991，9，2： | 5 |
| 2 | High-Throughput Measurements of Stem Characteristics to Estimate Ear Density and Above-Ground Biomass显示文摘Total above-ground biomass at harvest and ear density are two important traits that characterize wheat genotypes.Two experiments were carried out in two different sites where several genotypes were grown under contrasted irrigation and nitrogen treatments.A high spatial resolution RGB camera was used to capture the residual stems standing straight after the cutting by the combine machine during harvest.It provided a ground spatial resolution better than 0.2 mm.A Faster Regional Convolutional Neural Network(Faster-RCNN)deep-learning model was first trained to identify the stems cross section.Results showed that the identification provided precision and recall close to 95%.Further,the balance between precision and recall allowed getting accurate estimates of the stem density with a relative RMSE close to 7%and robustness across the two experimental sites.The estimated stem density was also compared with the ear density measured in the field with traditional methods.A very high correlation was found with almost no bias,indicating that the stem density could be a good proxy of the ear density.The heritability/repeatability evaluated over 16 genotypes in one of the two experiments was slightly higher(80%)than that of the ear density(78%).The diameter of each stem was computed from the profile of gray values in the extracts of the stem cross section.Results show that the stem diameters follow a gamma distribution over eachmicroplot with an average diameter close to 2.0mm.Finally,the biovolume computed as the product of the average stem diameter,the stem density,and plant height is closely related to the above-ground biomass at harvest with a relative RMSE of 6%.Possible limitations of the findings and future applications are finally discussed. | Xiuliang Jin Simon Madec Dan Dutartre Benoit de Solan Alexis Comar Frédéric Baret | 2019 | Plant Phenomics2019，1，1： | 5 |
| 3 | ON THE INVARIANCE PRINCIPLE FOR ρ-MIXING SEQUENCES OF RANDOM VARIABLES显示文摘In this note the author establishes the invarianee principle for ρ-mixing sequences under combinations of moment assumptions and ρ-mixing rates. The result answers a problem from a recent survey paper of Peligrad. | 邵启满 | 1989 | Chinese Annals of Mathematics,Series B1989，10，4： | 3 |
| 4 | Exact Solution of the Gyration Radius of an Individual's Trajectory for a Simplified Human Regular Mobility Model显示文摘We propose a simplified human regular mobility model to simulate an individual's daily travel with three sequential activities:commuting to workplace,going to do leisure activities and returning home.With the assumption that the individual has a constant travel speed and inferior limit of time at home and in work,we prove that the daily moving area of an individual is an ellipse,and finally obtain an exact solution of the gyration radius.The analytical solution captures the empirical observation well. | 闫小勇 韩筱璞 周涛 汪秉宏 | 2011 | Chinese Physics Letters2011，28，12： | 3 |
| 5 | Recent Progress of Biomarker Detection Sensors显示文摘Early cancer diagnosis and treatment are crucial research fields of human health.One method that has proven efficient is biomarker detection which can provide real-time and accurate biological information for early diagnosis.This review presents several biomarker sensors based on electrochemistry,surface plasmon resonance(SPR),nanowires,other nanostructures,and,most recently,metamaterials which have also shown their mechanisms and prospects in application in recent years.Compared with previous reviews,electrochemistry-based biomarker sensors have been classified into three strategies according to their optimizing methods in this review.This makes it more convenient for researchers to find a specific fabrication method to improve the performance of their sensors.Besides that,as microfabrication technologies have improved and novel materials are explored,some novel biomarker sensors—such as nanowire-based and metamaterial-based biomarker sensors—have also been investigated and summarized in this review,which can exhibit ultrahigh resolution,sensitivity,and limit of detection(LoD)in a more complex detection environment.The purpose of this review is to understand the present by reviewing the past.Researchers can break through bottlenecks of existing biomarker sensors by reviewing previous works and finally meet the various complex detection needs for the early diagnosis of human cancer. | Ruitao Liu Xiongying Ye Tianhong Cui | 2020 | Research2020，，1： | 3 |
| 6 | Cryo-EM structure of human lysosomal cobalamin exporter ABCD4显示文摘Dear Editor,Cobalamin,also known as vitamin B12,can only be biosynthesized by certain bacteria and archaea.As an essential nutrient for humans,it should be obtained from daily food.1 Exogenous cobalamin is taken up by the cell through an endocytosis process,then released into the lysosome as a free form,and finally pumped out to the cytosol for utilization.2 The human ATP-binding cassette(ABC)transporter ABCD4 localized on lysosomal membrane is indispensable for the efflux of cobalamin from lysosome to cytosol.3 Mutations in ABCD4 gene may result in cobalamin deficiency and inborn diseases.The patients suffer from combined symptoms:hypotonia,lethargy,poor feeding,bone marrow suppression,macrocytic anemia,and heart defects.3 However,the absence of the structure of human ABCD4 limits our understanding of the molecular mechanism of pathogenesis. | Da Xu Zhang Feng Wen-Tao Hou Yong-Liang Jiang Liang Wang Linfeng Sun Cong-Zhao Zhou Yuxing Chen | 2019 | Cell Research2019，29，12： | 2 |
| 7 | ON CRACK PROBLEMS IN AN INFINITE PLANE CONSISTING OF THREE DIFFERENT MEDIA显示文摘The mathematical problem of an infinite elastic plane consisting of three different media with an arbitrary number of cracks is considered. It is reduced to singular integral equations along the interfaces and the cracks by a constructive method. Those along the interfaces are further reduced to Fredholm ones. | 路见可 | 1989 | Acta Mathematica Scientia1989，9，1： | 2 |
| 8 | An example of earthquake nucleation of the strong continental earthquakes显示文摘 Introduction The study on earthquake nucleation is widely concerned by seismologists in the world. The experimental and theoretical studies indicate that earthquakes should be preceded by quasi-static slip within a nucleation zone (Oh-naka, 1992; Dodge, Beroza, 1995; Dodge, et al, 1996; Ohnaka, Kuwahara, 1990; Yamashita, Ohnaka, 1991). The earthquake nucleation process means a transition from quasi-static to quasi-dynamic rupture process, and it itself is a short-term precursor. Immediate foreshocks are local dynamic instabilities that occur during the transition from the quasi-static to the quasi-dynamic nucleation of the dynamic instability (Ohnaka, 1992). According to the recent theoretical study, immediate foreshocks can be regarded as the localized fractures accompanied by the quasi-static nucleation process of a large earthquake (Shibazaki, Matsu'ura, 1995). Therefore, foreshocks could occur during the nucleation process. The nucleation of earthquakes can be illuminated through analyzing foreshock activity in detail. Detection of the nucleation process by means of a foreshock study is a potential tool for earthquake predic-tion. The nucleation process of Izu peninsula earthquake with M=7.0 on January 14, 1978 is revealed by Ohnaka with foreshock activities. It was observed that the nucleation zone indicated by foreshocks grew at a rate of 1~40 cm/s before reaching a diameter of 10 km. The depths of foreshocks do not change much more, keep within 10 km. Recently, Hurukawa have studied the nucleation process of Off-Etorofu earthquake with MW=7.9 on December 3, 1995. The results show distinctly the nucleation process before the main shock. In the nucleation process, rupture started at the deepest point of the foreshock area, and then propagated to the shallow depth with the apparent ve-locity of 5~20 cm/s (Hurukawa, 1998). Rastogi and Mandal (1998) studied the rupture nucleation process of five Koyna medium-sized main shocks using the time-space patterns of foreshocks. They found that the nucleation zone grew at a rate of 0.5~10 cm/s until it finally attained a diameter of about 10 km before the occurrence of the main shock and the fracture nucleated at shallow depths and gradually deepened, the main shock occurred at the deepest point of the nucleation zone, that is, at the depth of about 8~11 km. Foreshock distribution showed a good agreement with the preslip model of earthquake nucleation (Rastogi, Mandal, 1998).…… | CHEN Xue-zhong | 2001 | Acta Seismologica Sinica(English Edition)2001，14，2： | 1 |
| 9 | CATALYTIC DECOMPOSITION OF TRICHLOROACETIC ACID显示文摘Anhydrous trivalent or bivalent metal trichloroacetates were reported to have been decomposed by heating in vacuum and trichloroacetyl chloride was found; and catalyst decomposition of trichloroacetic acid by manganous ion was reported by | 邵全省 陈平 吕华君 | 1983 | Chinese Science Bulletin1983，28，3： | 1 |
| 10 | THE TELECONNECTION BETWEEN TYPHOON FREQUENCY ON WESTERN PACIFIC AND THE SEA SURFACE TEMPERATURE OF EASTERN EQUATORIAL PACIFIC显示文摘Typhoon is the severe synoptical system generated from the tropical ocean surface and often brings disastrous weather to the coastal area of our country. Therefore, it is necessary, to study the rule governing its genesis and development, and to derive finally prediction technique. Since the energy of its development comes mainly from the sensible and latent heat over the ocean surface, there must exist certain con- | 潘怡航 | 1981 | Chinese Science Bulletin1981，26，2： | 1 |
| 11 | 谈谈all的几种用法显示文摘一、all+抽象名词。all在此表示“很”、“非常”。抽象名词通常为表示情感类名词。翻译可考虑将此用法译为:very+该抽象名词之形容词。 1.He was all gentleness to her.他对她彬彬有礼。 2.“I am all astonishment,”said Nelson,“when I reflect on what we have achieved”. 纳尔逊说:“当我回想起我们所取得的成绩时,觉得十分惊讶。” 3 At the moment,he was all energy.此刻,他精力充沛。 4.We were all eagerness to see him.我们切望见到他。 5.I shall be all anxiety till I hear from you. | 王文明 | 1990 | 语言教育1990，0，6： | 1 |
| 12 | Foreword显示文摘Destructive earthquakes have caused great damage in China and the United States and collapsing buildings havecaused many deaths and injuries. The field of earthquake engineering studies earthquake hazards, the occurrence ofearthquakes of various magnitudes, the nature of the ground shaking during an earthquake, the vibration of structuresduring earthquakes, the strengthening of existing structures and the design of new structures to be earthquake resistant, | George W. Houser | 2004 | Earthquake Engineering and Engineering Vibration2004，3，2： | 1 |
| 13 | make it的含义显示文摘make it 是英语口语中较常用的一个习语,有多种含义和用法,而且可以和其他一些词语搭配使用。在此习语中 it 的意义含糊,有人称之为惯用 it(The idiomatic“It”),有人称之为“不定宾语”(indefinte object)等。在《大学英语》(复旦大学主编)Book I Unit 2 Reading Practice“To Swim the | 孙妮 | 1997 | 语言教育1997，0，8： | 1 |
| 14 | ON THE PUNCTURED ELASTIC WELDING PROBLEMS OF DIFFERENT ANISOTROPIC MEDIA显示文摘0 IntroductionThe mathematical problems of fracture of compound materials are very important on practical applica-tions. In this paper, we study the plane welding problems of different anisotropic media with holes,theshape of holes and the interface are arbitrary smooth contours. At first, we establish mathematical models,change it into searching complex stress functions, next, we reduce the primitive problems into boundaryvalue problems, and construct the form of solution, under some general restrictions it is reduced to certainsingular integral equations, finally, the existence and the uniqueness of the solution of which are estab-lished.1 The Representation Formula of Complex Stress | 李星 | 1991 | 四川师范大学学报(自然科学版)1991，14，1： | 1 |
| 15 | The Theory Study of the Influence of the Topography on the Cold Frontal Motion显示文摘In order to study the characteristics of cold frontal motion over the arbitrary topography, the velocity of cold frontal movement is derived by using the one layer shallow-water model. The results show that there exist the retardation in upwind side and rapid descent in the lee slope when the cold front crosses the topography. | 顾伟 伍荣生 | 1992 | Advances in Atmospheric Sciences1992，9，2： | 1 |
| 16 | 坚果兄弟:用艺术表达真实(英文)显示文摘The eviction notice came on the last day of June this year.For the residents living in Baishizhou,Shenzhen’s largest'urban village,'the end had finally come.In 2017,the southern metropolis announced plans to transform all its urban villages into'clean,orderly,harmonious,safe,and happy homes'by July 2020. | 徐盈盈 | 2019 | The World of Chinese2019，0，6： | 1 |
| 17 | Unsupervised discovery of thin-film photovoltaic materials from unlabeled data显示文摘Quaternary chalcogenide semiconductors(I_(2)-II-IV-X_(4))are key materials for thin-film photovoltaics(PVs)to alleviate the energy crisis.Scaling up of PVs requires the discovery of I_(2)-II-IV-X_(4) with good photoelectric properties;however,the structure search space is significantly large to explore exhaustively.The scarcity of available data impedes even many machine learning(ML)methods.Here,we employ the unsupervised learning(UL)method to discover I2-II-IV-X4 that alleviates the challenge of data scarcity.We screen all the I_(2)-II-IV-X_(4) from the periodic table as the initial data and finally select eight candidates through UL.As predicted by ab initio calculations,they exhibit good optical conversion efficiency,strong optical responses,and good thermal stabilities at room temperatures.This typical case demonstrates the potential of UL in material discovery,which overcomes the limitation of data scarcity,and shortens the computational screening cycle of I_(2)-II-IV-X_(4) by~12.1 years,providing a research avenue for rapid material discovery. | Zhilong Wang Junfei Cai Qingxun Wang SiCheng Wu Jinjin Li | 2021 | npj Computational Materials2021，，1： | 1 |
| 18 | Characteristics of the Reservoir of the Rehai Geothermal Field in Tengchong, Yunnan Province, China显示文摘The Rehai geothermal field in Tengchong County, Yunnan Province is a significant high-temperaturehydrothermal convective system. The geothermal reservoir is composed of granite. Various geothermometersare used to evaluate the reservoir temperature. The most likely temperature of the reservoir as representedby TNa-K-Ca is about 230℃. The chemical and isotopic compositions of fluids before boiling within the reser-voir are estimated. The mixing and dilution of cold and warm waters are discussed. The Rehai geothermal fieldis a high-temperature (hot) water system with the subsurface boiling zone close to the surface. The reservoirpressure at different depths is calculated. And finally the water-rock equilibration is inferred. | Liao Zhijie Shen Minzi Guo Guoying Department of Geology, Peking University | 1991 | Acta Geologica Sinica(English Edition)1991，65，3： | 1 |
| 19 | Modulation of lysophosphatidic acid (LPA) receptor activity: the key to successful neural regeneration?显示文摘The central nervous system(CNS)is characterized by a remarkably elaborate cellular architecture comprising large numbers of glial and neuronal cells with enormous functional diversity,organized into highly complex and specific networks.During development,the various neural cell types must first be correctly specified,then assume their appropriate positions through carefully choreographed cellular migration,and finally establish and refine their functional connections,often over long distances.The end result of all these processes is an extraordinarily intricate anatomical structure,able to receive,integrate,and store information and orchestrate appropriate responses. | Isabel Gross Anja U.Brauer | 2020 | Neural Regeneration Research2020，15，1： | 1 |
| 20 | 高考英语写作高分三绝招显示文摘 | 谢期繁 | 2006 | 中学英语园地(高三版)2006，0，9： | 1 |
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