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双语推荐：大尺寸

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基于尺寸效应，对围岩塑性变形尺寸效应进行了研究，通过理论分析，确定了大断面隧道围岩塑性变形尺寸效应的关键影响因素，以更好的了解大断面隧道的结构稳定性。
Besed on size effect,study on size effect of surrounding rock plastic deformation. Through theoretical analysis,to determine the key influencing factors of size effect on large cross section tunnel surrounding rock plastic deformation,in order to better understand the structure sta-bility of large cross section tunnel.

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Culebra12D是Culebra区块的一口大位移定向井，二开井段为Φ406.4mm大尺寸长裸眼大位移井段，由于大尺寸井钻速与排量不匹配，导致岩屑携带不及时，斜井段形成了岩屑床；长裸眼井段浸泡时间长，导致井壁稳定性差和粘性加大；钻至6237ft时卡钻。分析并总结此次大尺寸井粘吸卡钻的特点及处理工艺。为该地区其他大尺寸井顺利作业提供参考。
Culebra12D is an extended reach directional well in Culebra block, the second section of it is a long bore well withΦ406.4mm oversized and extended reach. Because the displacement of the well doesn''t meet the drilling speed, which results in cuttings cannot be carried out in time, crooked section has been formed cutting bed. Bore well was soaked for a long time, which increased the wall instability and viscosity and finally lead to the stuck of the drilling pipe when MD reached 6237ft. The characteristics of stuck and its solutions are analyzed and summarized in this paper to make reference for the other operation of oversized wells.

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SIFT算法在仿射变换、噪声、一定程度的光照条件下具有良好的匹配性能，星上宽波段相机成像尺寸都非常大，超大尺寸图像直接利用SIFT算法，在构建高斯金字塔时空间占用大，同时导致计算用时长。通过研究仿射变换矩阵，提出可以通过计算超大尺寸图像的降采样图像之间的配准系数间接获取超大尺寸图像的配准系数的方法。经过实验验证，具有一定的可行性，对于图像配准从空间上减少计算量从而节约计算时间具有一定指导意义。
SIFT algorithm has a good matching performance under the conditions of affine transformation,noise and certain illumination. Since imaging size of the broadband camera on satellite is always oversized,if the oversized image is directly han?dled with SIFT algorithm,a big space will be occupied and a long computing time will be spended when building a Gaussian pyramid. By going into the affine transformation matrix,a method of calculating the matching coefficient between the downsam?ple images of oversized images to indirectly get the matching coefficient of the oversized images is proposed. The experimental re?sult indicates that this method is feasible. As for the image registration,it has a certain guiding significance for saving the com?putation time by reducing space occupation.

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采用国际通用的心理物理学实验，通过对点间距为1．67mm，总尺寸为1600mm ×1200mm的大尺寸彩色LED显示屏进行视觉舒适性的主观评价实验，得到了不同环境照度下的LED显示屏的最佳显示亮度的主观实验数据。采用数据拟合等算法建立了与环境照度相匹配的大尺寸彩色LED显示屏亮度调节模型，实现了将主观实验数据客观化。实验结果表明：拟合数据模型与实验数据吻合较好，该模型能较好地反映环境照度与大尺寸彩色LED显示屏最佳显示亮度的对应关系；采用该数据模型，在同等观看条件下，大尺寸彩色LED显示屏与液晶LCD电视的视觉舒适性没有明显差异。
This paper uses a large size LED color screen with 1.67mm-pixel pitch, 1600mm*1200mm-size to do the subjective assessment, gets serials subjective experiment data of LED best luminance for human visual comfort at different ambient illuminance, and builds an objective model by fitting calculation with these subjective experiment data.The results show, the fitting objective model matches the subjective experiment data well, and can show the relationship of LED best luminance of human visual comfort at various ambient illuminance;by using this model for LED color screen, there is no obvious visual comfort difference between LED color screen and LCD screen at the same viewing condition.

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采用落锤冲击试验法测试了X100螺旋埋弧焊管焊接接头的低温冲击韧性,并进行了断口特征及微观组织分析。结果表明,沿管壁厚度方向的冲击韧性变化不明显;焊接接头的冲击韧性呈现母材冲击韧性最高,约是焊缝和热影响区的1倍,焊缝略高于热影响区;母材韧窝尺寸大且深,焊缝韧窝尺寸均匀但较浅,焊接热影响区以小尺寸韧窝为主,含少量大尺寸韧窝;焊缝和粗晶区的大尺寸条状或棒状M-A岛使冲击韧性下降。
In this paper,the impact toughness of X100 SAWH pipe welded joint was tested by using drop weight tear test(DWTT) method at low temperature,and the fracture feature and microstructure were analyzed. The results showed that the impact toughness along wall thickness does not change obviously. The impact toughness changes greatly from weld,heat affected zone to base metal,and the impact toughness of base metal is the highest about one time compared to those of the weld and heat affected zone,and the impact toughness of weld is slightly higher than that of heat affected zone. The fracture feature displays large and deep size dimple in base metal,uniform and shallow size dimples in weld,and mainly to the small size dimple with a small amount of the large size dimple in heat affected zone. The large size bar or round M-A island make impact toughness decrease.

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简要介绍了采用双真空冶炼工艺大尺寸机匣用0Cr17Ni4Cu4Nb钢大规格棒材的研制情况。结果表明,其生产的?500 mm的大规格棒材,各项性能均能满足大尺寸机匣棒材的标准,说明现行大规格棒材的生产工艺是可行的。
The development of large size steel bar 0Cr17Ni4Cu4Nb for large size aero-engine casing with double vacuum smelting process is introduced briefly. The research results showed that the properties of 500 mm large size steel bar 0Cr17Ni4Cu4Nb met the requirements of standard for steel bar for large size aero-engine cas-ing, which proved that the current production process for large size steel bar was feasible.

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石墨烯作为一种二维sp2杂化碳的同素异形体,具有优良的电学、光学、热学及力学等性质.产业化应用石墨烯要求其具有大的尺寸且性质均一.化学气相沉积法(CVD)的出现为制备大尺寸、高质量的石墨烯提供了可能.本文结合近几年CVD法制备石墨烯的研究进展,综述了影响大尺寸、单晶石墨烯制备的工艺参数,包括衬底选择与预处理、碳源与辅助气体流量调控、腔体温度和压力控制、沉积时间以及降温速率设定等.最后展望了制备大尺寸单晶石墨烯的研究方向.
Graphene, as a two-dimensional sp2 hybridization allotropicity of carbon element, possesses unique properties of electricity, photology, thermology and mechanics. For industrialization, graphene possessing large dimension and homogeneous property is required. It can be prepared by chemical vapor deposition technology. In this paper, based on the progress of graphene research this year, we summarize the influence factors of graphene preparation, including substrate selection and preprocessing, carbon source and assist gas flow control, chamber temperature, pressure control, cooling rate, and deposition time setting, etc. Finally, we outlook the research direction of preparing the large-dimensional and single crystal graphenes.

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针对大尺寸叶片成形后回弹现象严重的问题,采用DYNAFORM软件模拟叶片成形及回弹过程。得到叶片成形后的成形极限图、厚度变化图等,分析了大尺寸叶片成形所存在的问题,计算其回弹量,为模具设计提供参考依据。
In view of springback problem of the large-sized blades after formation,the study uses DY-NAFORM software to simulate the forming and springback process. With the data about forming limit diagram, thickness variation diagram,the paper analyses the problems of large-sized blades forming and calculates the amount of springback. Hopefully,the study can provide a reference for the actual mold design.

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针对大尺寸轴对称高速潜航体壁面压力测点少且间距大,测量数据不足以反映空泡流状态下潜航体壁面压力分布规律的问题,提出基于数值分析的潜航体壁面压力分布计算方法.引入完全空化模型并研究其计算大尺寸潜航体壁面压力分布的可行性,分析潜航体尺寸在垂直方向上引起的水压对潜航体壁面压力分布的影响,获得空化数对潜航体壁面压力分布的影响规律.结果表明,利用完全空化模型计算大尺寸轴对称潜航体壁面压力时必须考虑潜航体尺寸在垂直方向上引起的水压影响;随着空化数的减小,空穴内部压力增大,潜航体壁面低压区增大,空穴尾部封闭端高压区与潜航体头部距离增大.
@@@@The regularity of surface pressure distribution of large axisymmetric submerged body is not ade-quately reflected by measured data,because pressure measuring points arranged on surface of high-speed submerged body are less and the distance between every two measuring points is larger. A computation method based on numerical analysis is presented to describe the surface pressure distribution of large submerged body. Full cavitation model is introduced. Its feasibility of calculating surface pressure of large submerged body is studied. The effect of hydraulic pressure at vertical direction caused by the size of large submerged body on the surface pressure distribution is analyzed.And the impact of cavitation numbers on the regularity of sur-face pressure distribution of large submerged body is studied. Results show that the influence of hydraulic pressure at vertical direction on the surface pressure distribution caused by submerged body size is neces-sary to be considered when the f

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对于某些大型设备而言，大尺寸的PCB成为不可或缺的器件。PCB尺寸增大，同时外层线路精细化、阻抗控制要求更加严格，致使外层蚀刻均匀性要求更为重要。本文着重对影响大背板蚀刻均匀性的几个因素进行剖析，以提高实际生产中过程中大背板的蚀刻均匀性。
As for some big equipment, large-size PCB becomes an indispensable device. PCB size increases, the outer line becomes more meticulous, and impedance control requirements is more stringent, which causes the outer etch uniformity particularly important. This article focuses on the analysis of several factors influencing uniformity of the back plate etching, in order to improve the uniformity of the back plate etching uniformity in production process.

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