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Search Results: 1 - 10 of 102678 matches for " 赵栋 "
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儿童Prader-Willi综合征合并扩张性心肌病一例
A Case of Prader-Willi Syndrome with Dilated Cardiomyopathy
 [PDF]

, 映敏
Asian Case Reports in Pediatrics (ACRP) , 2013, DOI: 10.12677/ACRP.2013.14015
Abstract: Prader-Willi综合征是由于15号染色体长臂特异区基因缺失或母源二倍体所致,其共同的临床表现为新生儿期肌张力低下,儿童期肥胖,智力低下,青春期无性发育,身材矮小。本文报道儿童Prader-Willi 综合征合并扩张性心肌病一例,并探讨Prader-Willi综合征的临床表现及遗传学特征、治疗方案,及与扩张性心肌病之间的关联。
 Prader-Willi syndrome (PWS) is a disorder caused by a deletion or disruption of genes in the proximal long arm of chromosome 15 or by maternal disomy in the proximal long arm of chromosome 15. Commonly associated characteristics of this disorder include diminished fetal activity, hypotonia, obesity, mental retardation, short stature, hypogonadism, and small hands and feet. We report a case of Prader-Willi syndrome with dilated cardiomyopathy, and review its Clinical manifestations, genetic characteristics and treatment method, then analysis the relation with the di- lated cardiomyopathy.
鱼眼镜头的畸变纠正分析
The Analysis of Fish-Eye Lens Distortion Calibration
 [PDF]


Geomatics Science and Technology (GST) , 2019, DOI: 10.12677/GST.2019.73020
Abstract:

本文所指超广角镜头是一种焦距为16 mm或更短的并且视角接近或等于180?的镜头,俗称“鱼眼镜头”。为使镜头达到最大的摄影视角,这种摄影镜头的前镜片直径很短且呈抛物状向镜头前部凸出,与鱼的眼睛颇为相似,“鱼眼镜头”因此而得名。鱼眼镜头的测量范围大,但是由于其变形严重,并没有广泛应用在摄影测量中,如果能有一种针对鱼眼镜头拍摄影像行之有效的纠正方法,则可以在一些测量中应用。目前对数码相机标定理论的研究已经相当成熟,国内外许多摄影测量和计算机视觉专家也提出了各种行之有效的标定方法,然而,针对鱼眼镜头的标定算法和软件仍然不成熟。本文将重点分析比较现有的鱼眼镜头标定模型,并通过编程实现鱼眼镜头的标定算法,最后以立体量测方式说明鱼眼镜头的标定精度。
The ultra-wide-angle lens’ focal length is 16 mm or shorter, and the angle of view is close to or equal to 180 degrees, commonly known as “fish-eye lens”. In order to make the lens reach the maximum viewing angle, the front lens of this lens is short in diameter and parabolic, projecting toward the front of the lens, which is similar to the fish’s eye, so “fish-eye lens” is named. Fish-eye lens has a large measurement range, but also large distortion, so it is not widely used in photogrammetry. If there is an effective correction method for the fish-eye lens image, it can be used in some measurements. Nowadays, the study of digital camera calibration is already quite mature, and the photogrammetry and computer vision experts both at home and abroad put forward many kinds of effective calibration method. Although there is a lot of camera calibrations method, to the fish-eye lens it is still immature. In this paper, I will focus on analyzing and comparing the existing fish-eye lens calibration models for fish-eye lens and achieve the calibration algorithm by programming, and finally use the stereoscopic measurement way to illustrate the accuracy of fish-eye lens calibration.

产业地域类型分类系统研究

系统工程理论与实践 , 1991,
Abstract: 县级经济单元中客观存在着不同的产业地域类型,它是在一定的地理条件下经济发展的产物。具有不同产业结构和发展方向的基本经济地域单元,分属于不同的产业地域类型。科学地划分产业地域类型,可以为产业空间的合理布局、分类指导生产基地建设以及分区实施经济综合发展规划提供科学依据。本文以河南省尉氏县为例,从基本地域单元的确定、指标体系的构造和筛选、类型划分结果分析等方面,具体论述了县级产业地域类型分类系统的模拟过程。
急倾斜煤与瓦斯突出煤层群矿井设计探讨

煤炭工程 , 2012,
Abstract: 在分析新疆焦煤集团砂沟煤矿开采技术条件的基础上,文章采用方案对比法,设计并详述了其井下巷道布置方法,并对防治煤与瓦斯突出进行了概述,为类似条件的煤矿设计建设提供参考。
煤炭国家规划矿区矿业权设置方案编制解读及问题探讨

煤炭工程 , 2013,
Abstract: 文章针对煤炭国家规划矿区矿业权设置方案从概念到历史进行了解读,对矿业权设置方案的编制进行了探讨,进而呼吁矿业权设置方案应从整个矿区规划切入,立足全矿区,掌握并分析全矿区内、外部条件,详细论证矿井划分,并初定井型,而不应是简单的两权资料收集整理,并呼吁矿业权审批程序应尽量简化,以更加优化矿业权设置方案,本文可作为矿业权设置方案管理和编制的参考。
纸房煤矿辅助运输方式选择及效能分析

煤炭工程 , 2013,
Abstract: 文章通过对新疆巴里坤矿区纸房煤矿运输方式的选择,采用比较法,从设备车辆选择,设备投资,定员效率等对煤矿井下的辅助运输方式究竟是用有轨运输还是用无轨运输进行了深入探讨,提出轨道运输方式与无轨运输的优缺点,并进行详细的列表对比论证。本文可作为日后辅助运输方式设计的参考
月桂酸插层改性Ni/Al–NO3–LDHs及其对摩擦性能的影响
,白志民
硅酸盐学报 , 2012,
Abstract: 采用液相共沉淀法制备了Ni/Al–NO3–LDHs,以月桂酸为插层剂,采用离子交换法对合成产物进行了插层改性。采用X射线衍射、热重及差热分析、红外光谱、扫描电镜、比表面积分析仪、四球摩擦实验机和齿轮实验机等手段对合成产物的结构和性能进行了评价。结果表明插层前,晶体呈六方片状,晶粒尺寸为40nm,比表面积为96.57m2/g;月桂酸插层后,产物的层间高度增加,但比表面积显著降低;Ni/Al–NO3–LDHs及其月桂酸插层产物可明显降低金属摩擦副的摩擦系数、磨斑直径、润滑介质温度以及驱动电机功耗
基于自回归技术的自适应服务质量测量方法

计算机科学 , 2004,
Abstract: sla管理已经成为服务商和用户关心的重要内容。在进行服务质量管理时,服务质量的测量是其他管理功能的基础。本文从采样的角度分析了服务质量测量和传统网络测量的异同点,给出了服务质量采样频率的理论下限。在讨论已有方法不足的基础上,提出了基于预测的自适应采样算法,该算法在采样区间内随机确定采样的具体时间点,并结合自回归预测方法对即将采样的结果进行预测,在此基础上以一定的概率接受预测结果,放弃对准确预测时间点的采样,从而减少了采样次数,降低了对服务的影响。最后的实验结果说明了算法的有效性。
基于TRIZ理论的海参捕捞机器人结构设计
Structure Design of Sea Cucumber Catching Robot Based on TRIZ Theory
 [PDF]

国海芝, 于复生, , 张佳
Mechanical Engineering and Technology (MET) , 2016, DOI: 10.12677/MET.2016.53027
Abstract: 海参的需求量随着人们对身心健康的关注而增加,但面临着人工捕捞困难的问题,本文即应用发明问题与解决理论(TRIZ)来探索如何将海参捕捞上来的方法。应用TRIZ理论提供的方法分析问题,借助问题定义得出问题的最终理想解。应用资源分析得到海参捕捞所具有的资源,应用因果分析得出现有问题的根本原因,并根据根本原因提出解决方案,提出了海参捕捞机器人的研制。应用矛盾矩阵和分离原理得出海参捕捞机器人可利用的发明原理,由发明原理得出机器人的优化设计,最终得出两款海参捕捞机器人:基于螺旋桨驱动的海参捕捞机器人和基于落脚点固定的海参捕捞机器人。本文设计的海参捕捞机器人为实物机器人的制造提供了理论依据。
With the attention to physical and mental health, people’s demand of sea cucumbers is increasing. But now we have faced a difficult problem of artificial fishing. TRIZ (Theory of Inventive Problem Solving) is applied to explore how to catch the sea cucumbers in the paper. The problem is analyzed by the methods provided by TRIZ. The IFR is obtained by the problem definition. The resources of catching sea cucumbers are obtained by the resource analysis. The primary reason of the problem is obtained by the cause-consequence analysis. The solutions are put forward according to these primary reasons. The sea cucumber catching robot is also put forward. The inventive principles of sea cucumber catching robot are obtained by contradiction analysis and separation principle analysis. The optimization design of the robot is obtained according to inventive principles. Two types of sea cucumbers catching robot are obtained finally. One robot is driven by propeller, and another robot is based on fixed point. The design of sea cucumber catching robots has provided a theoretical basis for the real robot.
安鹤煤田当中岗勘查区石炭—二叠系煤岩层对比研究
,东力,修军
煤炭工程 , 2014, DOI: 10.11799/ce201407034
Abstract: 利用钻探、物探及化验等多项成果,采用标志层、煤岩层组合特征、煤质特征和测井响应等多种方法,对安鹤煤田当中岗勘查区含煤地层进行划分对比,首次确定了煤系含煤12层及各组、段厚度,确定主采的二1、一11煤层的层位,二1煤电阻率372~1350Ω?m,低灰低硫;一11煤视电阻率320~860Ω?m,高灰高硫。文章以该区为例,论述煤岩层对比的重要性及不同方法的适宜性,并结合对比数据,阐述该区煤系沉积成因、组合差异、物性差异等内在机理。
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