摘要：in the tree与on the tree都表示“在树上”让我们来看一看它们有什么区别。in the tree指物品、动物或人落在树上或爬到树上。例如:The bird is singing in the *** is a caterpillar in the *** the tree指树本身长出或结出的东西在树上。

摘要：A simple uniaxial oedometric system is developed to test the elastic modulus of granular materials. The stress- strain relationship is first measured under conditions of uniaxial compression with additional lateral stress and strain, then the elastic modulus of the material is determined by the linear fitting method. It is found that the modulus is positively correlated to the grain size and negatively correlated to the container size. Arching and dragging are revealed to be the mechanism of such correlations by using the digital image correlation method and the pressure film technology based on the statistical method.

摘要：A design method of the apodizing functions for guided-wave four-port electrooptic tunable filter (EOTF) is proposed. As an example, the specific form of Gaussian apodizing function is designed by analyzing the crosstalk performance of EOTF. Crosstalk is calculated based on the transient response of the filter to an input optical pulse. It is concluded that crosstalk level below -30 dB for 20-Gb/s data rates and 100-GHz channel spacing is achievable with presently available substrate dimensions.

摘要：Themodelofpredictingdistributionsofstripthicknessattheexitandtensionstressesisestab-lishedbyconsideringmetallateralflow,anewkindofmet***g***　roll　profile,Optimization,Loaded　roll　gap

摘要：English study is becoming more and more ***,art students have weak English level on ***,it' s a problem for students and teachers to improve the quality of English *** this article,it analyses the reason for the weak English level and the responding ***' s more,it encourages students to study actively and advocates teach ing based on art knowledge.

摘要：A new type of fiber optic glucose biosensor based on fluorescence quenching has been designed and its properties have been studied. Glucose can be oxidized by oxygen when glucose oxidase are used as the catalyst, therefore, the concentration of glucose can be measured by detecting the consumption of oxygen. For the detection of oxygen concentration, the ruthenium(Ⅱ) complex, Ru(bpy)3Cl2, were used as the fluorescence indicator and its fluorescence lifetime were detected by lock-in technology. The detecting range of the sensor is 50 - 500 mg/dl and its response time is 30 seconds, showing that this kind of sensors is possible to be used in clinical diagnosis and detection.

摘要：　采用一维拉格朗日磁流体力学(MHD)程序研究了等离子体喷射轴心单丝的物理现象,给出了碰撞后铝丝受热膨胀和最后箍缩到轴心的整个过程图像,指出这一设计方法能在轴心丝上获得较高的电流上升率和较高的轴心压缩密度,并还给出了箍缩所得的功率和能量曲线。

摘要：基于蒙特卡罗方法模拟、计算并分析了芯片类型、大小、间距、数量以及布局对GaN基发光二极管(LED)集成封装器件COB(Chip on Board)能效的影响。计算结果表明:在芯片间距小于200μm且芯片尺寸或布局等参数相同的条件下,正装LED COB的能效最低,其次为倒装LED COB,垂直结构芯片的能效最大。当芯片间距大于200μm,3种LED COB的能效趋向饱和。芯片尺寸增加或数量减少可使正装和倒装芯片COB的能效上升,而垂直结构COB的能效基本保持不变。加入图形衬底可提高同样尺寸或布局的正装芯片COB封装器件的能效,但使倒装芯片COB的能效恶化。分析表明:芯片的侧面出光量占整个芯片出光量的比值以及相邻芯片材料的吸收对3种类型COB封装器件的能效有决定性影响。文中还针对正装芯片COB设计了新型菱形芯片布局,与常规正方形芯片布局的COB相比,其能效提高了6.2%。

摘要：Opioid crisis continues to gain ground in the United States with little regards to color or economic *** than 800 people die weekly from opioid-related overdosestotally well over 42,000 deaths in 2016,and the number is ***,the opioid overdose deaths involved an estimated 40%prescription opioid *** reported by the National Drug Institute(2017),opioid addiction is often described as an“equal opportunity”problem that can afflict people from all races and walks of *** the crack crises of the past,the present opioid epidemic has extremely impacted White Americans not only the rural and poor,but also suburban and middle class or ***,current opioid overdoses deaths have increased for Whites,Blacks,and Hispanics,they have increased to a far greater degree for White *** to battle the increasing opioid epidemic have moved from incarceration to using legislation to limit the prescriptions being *** and federal laws are being enacted to placing limitations on opioid prescriptions.

摘要：《汉学还是艺术史——中国艺术研究方法笔记》(SINOLOGY OR ART HISTORY Notes on Method in the Study of Chinese Art)是半个多世纪以前一篇有关中国艺术史研究方法论的经典旧文，但对今天的中国艺术史研究仍有现实意义。作者约翰·亚历山大·波普(John ***)，1906年生，1938年以哈佛燕京社研究生身份留学欧洲，1941年获哈佛大学硕士学位，1955年获哲学博士学位，1972年成为米德堡学院荣誉文学博士，