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Search Results: 1 - 10 of 122331 matches for " 顾正华 "
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应用微机绘制H-U关系曲线
陆雍,
色谱 , 1987,
Abstract:
一种联合π定理和神经网络的试验数据挖掘模式
,唐洪武,段子冰
海洋工程 , 2006,
Abstract: 为了解决试验数据分析手段的不足和单一问题,联合人工神经网络理论和π定理,提出一种试验数据的挖掘模式,并把它应用于快速船伴流场特性分析中,结果表明该数据挖掘模式不但能有效地克服前述问题,还能降低物理模型试验对试验组次的要求,得到量纲和谐的、具有统一形式的非线性公式,有助于提升物理模型试验的知识发现层次.
Generalized Genetic Algorithms and Its Application to Identifying Flow Parameters
广义遗传算法及其在水流参数反演中的应用

GU Zheng-hua,

系统工程理论与实践 , 2006,
Abstract: Enlightened from Accelerating Genetic Algorithms(AGA),the author presented Generalized Genetic Algorithms(GGA) to settle the problem that Simple Genetic Algorithms(SGA) can't be easily applied to practice.GGA inherits ancestor's genes and imitates trend behavior in nature.It can preserve excellent individuals' diversity and uses excellent individual room of ancestors as propagating room of next generation.GGA generalizes SGA and AGA.When GGA's parameters configured,more kinds of GAs may be designed.GGA was applied to identifying flow parameters,and the results indicated that GGA has rapid convergence rate and high convergence precision.Thus,GGA's future is hopeful.
高度有序氧化钨纳米棒的制备和表征
,王醒东,
物理化学学报 , 2009,
Abstract: 采用直流磁控溅射法结合阳极氧化法在铝基纳米点阵上制备氧化钨(wo3)纳米棒.运用原子力学显微镜(afm),电子扫描显微镜(sem),x射线衍射仪(xrd),电化学工作站(ew)和紫外-可见分光光度计(uv)观察表征了wo3纳米棒的表面形貌、结构、光学性能和电致变色性能.结果表明:在溅射过程中,溅射粒子优先沉积于铝基纳米点阵的凸点上,然后成核并形成棒状;wo3纳米棒的直径约为200nm,与铝基纳米点阵的直径一致,拥有一定的电致变色性能.
二维碳材料——石墨烯研究进展
,季根,卢明辉
南京工业大学学报(自然科学版) , 2010,
Abstract: 墨烯被喻为材料科学与凝聚态物理领域正在升起的“新星”,它所具有的许多新颖而独特的性质与潜在的应用正吸引了诸多科技工作者.介绍了近年石墨烯在制备、性能等方面的一些研究情况,就其应用前景也作了简要介绍.
基于sift特征匹配的camshift运动目标跟踪算法
,苏杭?,戎海龙?
计算机科学 , 2014, DOI: 10.11896/j.issn.1002-137X.2014.06.058
Abstract: 针对复杂背景下采用一般camshift算法跟踪目标容易失败,提出将sift(scaleinvariantfeaturetransform)特征点匹配融入到camshift算法。该算法利用sift特征对尺度和方向无关特性实现连续图像序列的精准匹配,具有对尺度缩放、目标旋转以及亮度变化保持不变性的优点,不仅弥补了一般camshift算法只以颜色为关键信息的不足,而且可将目标跟踪窗口形心和质心间的位移稳定在设定阈值内。最后通过对比性实验来验证该算法的有效性和稳定性。实验结果表明,该算法能够对复杂背景下的光照突变、缩放和旋转运动目标实现实时稳定跟踪。
杨氏柠檬酸杆菌磷脂酶A1基因在E.coli中的表达
姚其玉,张梁,石贵阳,
- , 2015, DOI: 10.3969/j.issn.1673-1689.2015.11.009
Abstract: 为实现磷脂酶A1(PLA1)的异源表达,将杨氏柠檬酸杆菌(CICC No.21596)PLA1基因插入载体pET28a(+)中,构建重组表达质粒pET28a(+)-pla1,并将重组质粒转入宿主菌E.coli BL21(DE3)中,获得重组菌pET28a(+)-pla1/DE3。在IPTG诱导作用下经SDS-PAGE检测,发现在重组菌发酵破碎上清液中存在33 000大小的蛋白质,与预期蛋白质大小相符。在硼砂卵黄平板上对重组菌PLA1活性进行检测,结果显示重组菌具有明显的PLA1活性,表明PLA1基因在大肠杆菌中得到了表达。经发酵初步优化,获得摇瓶发酵的最佳诱导表达条件为:转接体积分数4%、诱导时机2 h、IPTG终浓度为0.4 mmol/L、37 ℃诱导培养8 h。经酸碱滴定法测得最高酶活为(5.6±0.2) U/mL。
For the heterologous expression of phospholipase A1,the gene of phospholipase A1 from Citrobacter youngae(CICC No.21596) was cloned into the expression vector pET28a(+) to construct the recombinant plasmid pET28a(+)-pla1.Then the recombinant plasmid was transformed into E.coli BL21(DE3) to achieve the recombinant strain pET28a(+)-pla1/DE3. After subsequent induction by isopropyl β-D-1-thiogalactopyranoside (IPTG),an approximately 33 000 protein was detected in the cell lysate supernatant by SDS-PAGE. The PLA1 activity was detected in an egg yolk agar plate,indicating that the PLA1 gene was expressed in E.coli. The best induction conditions for PLA1 expression were achieved by the optimization of fermentation condition and it was showed as follows,4% of inoculum amount,2 h of initial culture,8 h of induced culture in the presence of 0.4 mmol/L of IPTG,and growth at 37 ℃. Under the optimized conditions,the maximum PLA1 activity in the supernatant was (5.6±0.2) U/mL
A SPECTRUM AND CROSS-CORRELATION ANALYSIS OF AUDITORY BRAINSTEM RESPONSES (ABR)
听觉脑干诱发电位的频谱分析和相关分析

徐静,孙路,宋如垓,,凡及,周耀华
生物物理学报 , 1986,
Abstract: A spectrum and cross-correlation analysis of auditory brainstem responses (ABRs) of normal subjents and patiects with hearing disorders was studied at about 200Hz, 500Hz and 800-1000Hz while few components above 1200Hz in the amplitude-frequency curves of ABRs of normal subjects.The spectrum amplitudes of ABRs for patients with hearing disorders are much smaller than that for normal subjects. The whole spectrum shifts towards low frequency end and frequency components are mainly below 600Hz.The cross-correlation function of ABRs between normal subjects and certain standard ABRs reaches its maximum within the first 0.5 ms, after that it decreases gradually. There is no distinct maximum in the cross-correlation function between abnormal ABR and the standard one, the whole curve appears rather plain.
红外应力图分析方法的应用
,袁旬,绍德,胡德敬
力学与实践 , 1994, DOI: 10.6052/1000-0992-1994-061
Abstract: 本文运用红外应力图分析方法给出了圆板试件应力图的定量分析结果和一些应用实例。
辽宁省近地层风切变特征研究
龚强, 汪宏宇, 朱玲, 蔺娜, ,, 徐红
自然资源学报 , 2015, DOI: 10.11849/zrzyxb.2015.09.012
Abstract: ?利用辽宁省风能资源专业观测网26座测风塔2009年6月至2010年5月10~70m(100m)的逐时梯度风观测数据,研究了辽宁省近地层风切变特征,结果表明:近地层风速随高度变化基本遵循幂指数规律;各塔年风切变指数为0.0244~0.4050,没有明显的空间分布规律,主要受局地地形、地貌环境影响,个体差异较大;有11座测风塔年平均风切变指数大于B类风切变指数,26座测风塔空间平均年风切变指数为0.1551,也略大于B类风切变指数;风切变指数呈现明显的白天小、夜间大的日变化特征,与气温的日变化呈反位相;春季风切变指数明显偏小;大气中性条件下的风切变指数与年平均风切变指数基本相当,稳定状态下风切变指数明显偏大,不稳定状态下最小;风切变指数具有随风速增大而减小的特点,大风条件下的平均风切变指数小于年平均风切变指数,多数测风塔风速≥15m/s时风切变指数下降至0.1以下。
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