搜索结果: 1-15 共查到“工学 gamma”相关记录40条 . 查询时间(0.046 秒)
REMOTE SENSING GEOBOTANY AND AIRBORNE GAMMA-RAY DATA APPLIED TO GEOLOGICAL MAPPING WITHIN TERRA FIRME BRAZILIAN AMAZON FOREST:A COMPARATIVE STUDY IN THE GUAPORE VALLEY (MATO GROSSO STATE,BRAZIL)
Remote Sensing Geology Geophysics Mapping Forestry Multispectral ASTER
2015/12/29
This paper comprises a comparison between the vegetation response in ASTER (Advanced Spaceborne Thermal Emission and Reflection Radiometer) multispectral optical imagery and possibly equivalent bedroc...
Dual-hop transmissions with fixed-gain relays over Generalized-Gamma fading channels
Journal of Telecommunications
2015/7/15
In this paper, a study on the end-to-end performance of dual-hop wireless communication systems equipped with fixed-gain relays and operating over Generalized-Gamma (GG) fading channels is presented. ...
2015年4月26-30日，“Gamma Alloy Technology 2015（GAT2015）”国际会议在南京召开。此次会议由南京理工大学、北京科技大学和哈尔滨工业大学联合举办，来自美国、德国、法国、英国、日本、韩国、俄罗斯、伊朗及国内中国科学院金属研究所、清华大学、上海交通大学等100余名专家学者参加此次会议。大会主席由北京科技大学林均品教授、美国UES首席科学家Young-Won Ki...
在自由空间光通信(FSO)中,由系统设计以及大气湍流所引起的光强闪烁和相位起伏会造成圆偏振控制误差,这严重影响圆偏振位移键控(CPolSK)通信系统的性能。因此,基于Gamma-Gamma大气信道模型,在较全面考虑光强起伏、相位噪声和圆偏振控制误差三个参数的基础上,建立了CPolSK系统信道的数学统计模型,推导了平均信道容量的闭合表达式,仿真研究了误码率在连续相位噪声下的性能以及三个参数对信道容量...
Macromolecular Assemblies: Human Gamma-Crystallin Protein, Glutamic Acid Bottle Brushes, And Hyaluronic Acid Gels
Pure sciences Biological sciences Macromolecular assemblies Gamma-crystallin proteins Glutamic acid Hyaluronic acid
2014/11/21
Macromolecular assemblies constitute the world in which we live. The work contained within this thesis has studied three different types of macromolecular assemblies: human γ-crystallin protein aggreg...
一种基于椭圆RHM的扩展目标Gamma高斯混合CPHD滤波器
多目标跟踪 扩展目标 高斯混合 势概率假设密度
2016/1/4
针对杂波环境下扩展目标形状难以估计、目标跟踪精度低等问题,提出一种自适应估计扩展目标形状的伽玛高斯混合势概率假设密度算法(GGM-CPHD).该算法将目标的扩展形状建模为椭圆随机超曲面模型,并将其嵌入到GGM-CPHD滤波器中,更新扩展目标的质心、椭圆形状和方向等信息以完成对扩展目标的跟踪.通过杂波环境下未知数目的扩展目标仿真实验,表明了所提出算法在质心状态和椭圆长短轴的估计精度方面要优于传统的基...
针对已有统计模型无法精确刻画高分辨率SAR（Synthetic Aperture Radar合成孔径雷达）图像的统计特征的问题，本文提出一种基于乘积模型的统计模型称为混合Gamma拖尾Rayleigh分布模型。在该模型中，我们利用拖尾Rayleigh分布对相干斑进行建模，使模型可以精确拟合高分辨率SAR图像相干斑的尖峰和厚尾的特征；同时我们引入混合Gamma分布对高分辨SAR图像RCS（Radar...
基于Gamma过程的视情维修策略分析
Gamma 过程 视情维修 劣化状态 检测能力
2016/9/28
针对现有文献对视情维修的研究忽略了设备检测时间的问题，建立一种基于Gamma 过程的视情维修的解 析模型。以维修费用为目标函数求解获得了设备的最优预防维修阈值和最优检测间隔，对设备的劣化状态进行描述 并对维修过程建模，在该解析模型下，通过大量的数值仿真，分别比较分析了设备劣化状态变化特性以及维修能力 对视情维修最优策略值选取的影响，并获得了相应的结论。仿真算例证明了该方法的可行性，可为维修方选取最...
基于混合Gamma信道模型研究了两跳中继系统在联合多径阴影衰落环境下的性能.推导了两跳中继系统端到端信噪比的累积分布函数和矩生函数的精确闭式解,并基于这些闭式解分析了两跳中继系统的误码率、中断率和分集增益等性能.与广义K衰落模型下的性能进行了比较,运用混合Gamma衰落模型可获得简单精确的结果.最后数值和仿真分析验证了理论研究的正确性.
LDPC在gamma-gamma信道下的性能分析
光通信 低密度奇偶校验码 调制方式 gamma-gamma湍流信道
2014/3/31
为了提高无线光通信系统的性能,将低密度奇偶校验码作为信道编码,在已知信道状态信息的条件下,对低密度奇偶校验码(LDPC)+二进制脉冲位置调制(BPPM)系统与LDPC+开关键控(OOK)系统分别在加性高斯白噪声(AWGN)、弱湍流、中等湍流和强湍流信道中的性能进行了比较;仿真了OOK和BPPM在各个强度湍流信道下的编码增益;并对LDPC结合不同进制数的脉冲位置调制(PPM)进行了分析。结果表明,L...
Using the Dual Energy Gamma-Ray Transmission Technique to Measure Soil Bulk Density and Water Content of Central Southwestern Nigerian Soils
Dual Energy Gamma-Ray Bulk Density Water Content Radiological Attenuation Coefficient
2013/3/12
In this work, a radiological technique which simultaneously measures soil bulk density and water contents accurately and quickly in a non-destructive manner at different depths of the soil profile of ...
Effect of Gamma Radiation and Low Temperature on Pathogenic Staphylococcus aureus Isolated from Pizza
Gamma Radiation Pathogenic Staphylococcus
2016/6/1
Staphylococcus aureus, a common human pathogen, produces enterotoxin and causes intoxication when ingested through contaminated food. The aim of the present study was to investigate microbiological qu...
分析了在Gamma-Gamma分布下基于脉冲位置调制(pulse position modulation, PPM)方式的多输入输出自由空间光学（multiple input multiple output free space optics, MIMO-FSO）通信系统模型。首先推导了单输入单输出（single input single output, SISO)-PPM系统的误时隙率（slot...
A high dynamic range liquid crystal display (HDRLCD) can enhance the contrast ratio of images by utilizing locally controlled dynamic backlight.We studied the HDR-LCD as a dualpanel display: a backlig...
Effects of dietary glutamine and gamma-aminobutyric acid on performance, carcass characteristics and serum parameters in broilers under circular heat stress
Broiler chicken Heat stress Glutamine Gamma-aminobutyric acid Serum parameter
2012/8/14
This experiment was conducted on broilers to evaluate the effects of dietary glutamine (Gln, 0 and 5 g/kg) and gamma-aminobutyric acid (GABA, 0 and 100 mg/kg) on growth performance, carcass characteri...