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Before becoming a professor in 1981, Meyer was employed in the newspaper industry for a total of 26 years, the last 23 with Knight Ridder Inc., where he started as a reporter for the Miami Herald.
在案例研究以期探索公共新闻运作之路后,Meyer等人转向内容研究,以求归纳出公共新闻内容的判定标准。1996年,Ken Blake运用Meyer与Deborah Potter在佛罗里达初选中搜集的数据,探讨出依照内容来界定公共新闻的测量标准。
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Although some studies have reported an incidence of calcification as high as 25 to 30 percent, others have identified it far less often. When calcification is present, however, the roentgenographic pattern most often resembles popcorn, a finding that is almost diagnostic. The presence of fat and calcium make the CT diagnosis exquisitely accurate. In a report of 47 lesions studied by CT, 30 (63.8%) contained fat only (n=18), calcium and fat (n=10) or calcium alone (n=2). Thin sections must be used to identify fat with certainty.
虽然有的研究报道钙化率可高达25 ~30 %,也有的报道远小于此,但是当钙化出现时,常表现为爆米花状,脂肪和钙化的出现在CT显示精确,在一个47个病灶的CT研究中,30个63.8%含有脂肪,10个含有钙化和脂肪,2个仅有钙化,要显示脂肪成分,必须用薄扫,由于部分容积效应,当层厚教厚时,小的空腔容易与脂肪混淆。
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Starting from the basic concept and principle of reliability theory, some methods of reliability analysis and calculation for structural members and systems are discussed in seme detail m this paper, On the basis of others'research achieements , the method for calculating the reliabillity of continuous PPC girder bridge system is deduced from the probability of failure,In accordance with the test resuIts of 14 two-span continuous PPC model beams , obtained from the rescarch project,A study on the plastic ...
本文从可靠度理论的基本概念和原理出发,主要论述了结构杆件和系统可靠性分析和计算方法。在前人研究的基础上,利用失效概率推导出连续梁系统可靠指标的计算方法,本文还根据高等学校博士学科点专项科研基金资助项目《大跨度预应力混凝土桥塑性行为的研究》所进行的十四片两跨混凝土连续梁桥模型试验的数据算出各梁承载能力的系统可靠指标。
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The order-disorder transitions of stoichiometrical AB and A3B alloys werestudied by using effective-atom model based on EAM potential.The results give the analytic function form of the free energy in term of the long rangeorder parameter,and indicate that order-disorder transition behaviors of stoichiometri-cal AB and A3B alloys may be different. This method can be applied to interpret theexperimental results of order-disorder transition in stoichiometrical NiAl and Ni3Al.
利用EAM势基础上的等效原子模型分析了结构稳定性与长程有序度的关系,给出了二元体系结合能与长程有序度解析关系的一般表达式,说明当量成分下AB和A3B型合金有序无序转变行为的不同,并以NiAl和Ni3Al为研究对象具体研究了其有序无序转变,从理论上解释了这两种有序金属间化合物在实验中所表现出的不同有序无序转变行为特征。
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In this paper,we use geostatistics to analyse special variability of soil salinity in Yanqi Basin of Xinjiang base on soil salinity data,and then we predict and draw the soil-salinity-class maps including unsampled region,it shows: the soil salinity data's Cv are not less than 100% and have very strong special variability;the spherical model f...
在焉耆盆地大规模的土壤取样、试验分析盐分数据的基础上,采用地统计学的方法对研究区的土壤盐分进行了空间特征变异分析,并采用普通克里格插值法制作出焉耆盆地的土壤盐分空间数字地图,结果表明:研究区各层土壤盐分变异系数均大于100%,具有强空间变异性;对土壤盐分进行半方差函数计算分析,发现拟合的理论模型均为球状模型,各层土壤盐分表现出强烈的空间相关性;土壤盐渍化程度在水平方向的分布与地形地势的关系密切,在垂直方向则表现出强烈的表聚特性。
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By the study of the relationship between vegetation and spatial characteristics of UHI, the mainly spatial characteristics of UHI has been analyzed and it was:(1) The terrain of the suburbs is higher than the urban region, the gradient of the terrain height is small, and this geomorphological featrue is conducive to assemble of the heat, the UHI phenomenon of Changsha is obvious especially in the summer night;(2) The UHI distribution is similar to the outline of the urban construction. The LST of urban is 3-5℃ higher than the flat low areas close around the city, and 6-8℃ higher than further areas. The region which has the most obvious UHI phenomenon is the region surrounded by the second city ring road, and the UHI phenomenon gradually weakened from the city centre to suburb;(3) The impact of geomorphological character to UHI is notable, the relationship between vegetation index and UHI is Anti-related, it was indicated that the improvement of the vegetational status is very important to the elimination of UHI phenomenon, the implementation of the urban green land planning can reduce UHI effect.
通过分析长沙城市地区的土地覆盖、植被绿地状况与热岛空间分布状况的关系,揭示出研究区域UHI主要特征为:(1)从研究区域地表覆盖图发现,长沙市城区四周均有相对地势较高的山地,但地形梯度不大,接近四面环山的地貌特征,容易造成城区的热量聚集,有利于城市热岛效应的形成,使得长沙城区存在明显的热岛分布;(2)UHI分布与城市结构的轮廓相一致,长沙城区与地势相对平坦的近郊区的地表温度差异为3~5℃,与地势较高的周边远郊区的地表温度差异为6~8℃,长沙城区热岛效应与城市规划呈对应关系,热岛效应最显著的区域为二环线内,并从中心沿三环逐渐向郊区减弱;(3)地表覆盖类型对UHI的效应明显,长沙地区植被绿地状况与UHI呈现明显反相关分布,揭示出植被绿地对降低UHI具有重要的作用,大范围的绿地建设能有效降低UHI。
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The geology research of carbonate reservoirs in Ordovician of Tahe oilfield showed that many large dissolved vugs and fractures were developed. The spread of the reservoir take on a very heterogeneous state. And the typical fractured-vuggy reservoirs was formed. According to the combination of the various spaces, the formation was divided into vuggy formation, fractured-vuggy formation and fractured formation. The research showed that development of the vug is relevant to the its position on the structure, the fractures, the water surface and the weathering surface. Multi-phase charge and recharge of the oil in the reservoirs resulted in the complexity of the fluid distribution. So the"Bottle Model"was brought forward to explain the movement of the water-oil contact. The special storage space and the complex fluid distribution lead to the unstability of the production and the complexity of the water cut. In order to explain the characteristic of the fracture-vug unit was brought forward and the basic principle and method of the partition of the fracture-vug unit was formed. The classification and evaluation of the units were performed according the reserve and energy. Based on the research of geology characteristic and the fluid flow in the reservoir the comprehensive numerical simulation plan of the fractured-vuggy reservoirs were established. Through the selection of the simulation unit, fluid flow type and parameter equivalent the triple media reservoir simulation model was established. Considering the practical application the model was resolved by the DKR decomposition conjugate grads method. Based on the fine reservoir description of Dsitrict IV of the Tahe oilfield the various space type were classified and combined together. The geology model of Unit S48 was constructed. Two typical single well model was established according to the geology and the dynamic phenomena. Finally the single well model and the Unit S48 were simulated by the triple media reservoir simulator. Via the local grid refinement and coarsening in the simulation good matchs were gained. Based on the results of the simulation the reserve distribution, percent of reserve produced in various space and the natural energy were analyzed. The fluid was storaged in the fractures and vugs mostly and more than 90% the produced oil came from the systems. The energy belonged to the active one. The results of simulation accorded with the fact and showed the validity and practicability the research and the simulator.
塔河油田奥陶系碳酸盐岩油藏的地质研究表明,其储层中发育着很多大型的溶蚀洞、缝,储层的平面展布呈现出极度的非均质性,形成了典型的缝洞型碳酸盐岩油藏,根据各种孔隙介质在储层中的组合,将储层分为了溶洞型、裂缝-溶洞型和裂缝型三类;研究表明溶洞储层的发育和构造位置、裂缝的发育、潜水面和风化面的位置等因素有关;多期充注的油气成藏模式导致了流体复杂的赋存状态,由此提出了所谓的&瓶子模型&,解释生产过程中油水界面的变化;特殊的储集空间类型和流体分布特征导致油田在开发过程中表现出很大的不确定性和含水变化的复杂性,为了合理的解释油气田开发过程中的动态特征,提出了&缝洞单元&的概念,并制定了&缝洞单元&纵横向划分的基本原则和依据及划分方法,并对&缝洞单元&进行了分类和评价;基于地质特征和流体在其中流动规律的研究,提出了缝洞型碳酸盐岩油藏的数值模拟综合解决方案,通过模拟单元的选择、流动类型和参数的等效,建立了三重介质油藏三维三相数值模拟模型,采用不完全LU分解预处理共轭梯度法进行了求解;在塔河油田4区精细油藏描述的基础上,将各种类型的孔隙空间进行了归类组合,建立了S48单元的地质模型;通过对油井生产动态进行分析研究,建立了两类和油井地质、生产动态相对应的单井模型;最后应用三重介质油藏数值模拟软件对单井模型和S48单元进行了数值模拟,通过局部加密和粗化等技术模拟流体流动规律,取得了很好的拟合效果;结合数值模拟结果,分析了各种介质中的储量分布、储量产出的百分比以及地层的能量,认为塔河油田缝洞型油藏中流体绝大多数储集于缝洞系统之中,所产出流体90%以上也来自于缝洞系统,其底水能量属于较充足的类型;模拟结果和油田实际情况符合较好,说明了地质研究和油藏数值模拟研究的正确性。
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This paper studies the global topological structure of a kind of plane homogeneous fifth system with three special direction Suppose the system has are only one finite singular point (0,0), then we can assume b50=0, which special directions are determined by equation G=0, introduce Poincare transformation to discuss infinite singular points, according to the coefficient conditions, list all possible infinite singular points and special directions, judging their type, drawing out all kinds of phase portraits when it has three special direction.
研究了一类平面齐五次系统当其只有唯一的有限远奇点且具有三对特殊方向时的全局拓扑结构及系数条件。假设系统只有唯一的有限远奇点(0,0),不妨设b50=0其特殊方向由示性方程G=0给出,引进poincare变换研究无穷远奇点,再根据定理中的系数条碎,列出系统所有可能的无穷远奇点和特殊方向,并判断其类型,由此画出系统具有三对特殊方向时的全局相图。
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Learning style means a person's natural, habitual, and preferred way of learning. Research about learning styles has identified __(26)__ differences. For example, one study found various differences __(27)__ boys and girls in sensory learning styles. Girls were __(28)__ more sensitive to sounds and more skillful at fine motor performance than boys. Boys, __(29)__, showed an early visual superiority to girls. They were, however, clumsier than girls.
学习风格指的是一个人自然的、习惯的、偏好的学习方式,关於学习风格所做的研究已辨识出性别间的差异,例如某研究发现,男女生在感知学习风格上有许多不同之处,女生对声音比较敏感,对比较细致的动作也比男生来的熟练;相反的,男生早期就显现出优於女生的视觉,但他们又比女生笨拙,在细腻动作的方面表现不佳,例如穿一串珠子。
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The other, however, is not so satisfying in that the balance in the previous four years has been broken: the newly recruited outnumbers the senior ones between 1998 and 2003, leading up to a series of problems, including 1 the number of retired athletes increases every year, along with the decrease of the rate of successful deployment, 2 papers issued by the government guiding the deployment were not carried out properly, 3 the papers themselves were outdated and ways of deployment are restricted, 4 the present system of the government is too old for the new situation and has many stark contradictions, 5 the retired athletes ... themselves are not quite adequate for the comprehensive requirements posed by a ever-developing society, 6 specialties of athletes dont meet the needs of the employers, 7 discrepancies of understanding of the deployment among the managing staff, the coaches and the athletes has a limiting effect, 8 the absence of a unit specialized in the deployment of the retired excellent athletes 9 the training of the athletes do not match the need of the time.
3福建省退役就业现状的研究研究结果表明1994—1998年福建省退役运动员的就业问题解决的很好,&出&与&入&两方面保持平衡:1998—2003年福建省退役运动员就业山现了&出&与&入&的极大不平衡,表现在&入&多&山&少,运动员退役就业出现很大问题,这些问题主要表现在:运动员退役的人数在逐年上升,而相反就业的人数呈逐年递减;政府制定的退役运动员安置文件的落实没有很好的落实到位;退役运动员就业文件滞后、不到位,就业渠道难以拓宽:政府体制陈旧,矛盾突出:运动员的自身综合素质达不到社会对复合型人才的要求;运动员所从事的体育项目与就业安置方面的联系;管理人员、教练员和运动员对安置工作认识上的误差制约:。
- 推荐网络例句
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The split between the two groups can hardly be papered over.
这两个团体间的分歧难以掩饰。
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This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.
这种做法不仅鼓励了更多的反应,而且减少跟风的可能性。
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The new PS20 solar power tower collected sunlight through mirrors known as "heliostats" to produce steam that is converted into electricity by a turbine in Sanlucar la Mayor, Spain, Wednesday.
聚光:照片上是建在西班牙桑路卡拉马尤城的一座新型PS20塔式太阳能电站。被称为&日光反射装置&的镜子将太阳光反射到主塔,然后用聚集的热量产生蒸汽进而通过涡轮机转化为电力