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Search Results: 1 - 10 of 304842 matches for " 王拯 "
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磁载光催化剂TiO2/Al2O3/γ-Fe2O3的制备与降解染料的优化模型
,张风宝
环境化学 , 2015,
Abstract: 采用共沉淀结合固体粒子混合法,在TiO2中引入三氧化二铝包膜磁性核,通过对催化剂的XRD,TEM和红外光谱分析,发现磁性核具有γ-Fe2O3的晶相,且被三氧化二铝及二氧化钛包裹,形成复合型磁载光催化剂.同时对影响磁载光催化剂氧化直接耐酸大红4BS染料废水的因素初始pH值(5.3—5.7)、光强(12.35—18.455μW·cm-2)和TiO2浓度(0.45—1.45mg·l-1)进行研究,通过建立响应曲面模型可得到最佳的初始pH值、光强和磁载光催化剂浓度分别为5.45,19.49×102μW·cm-2和0.86mg·l-1,脱色率达到92.4%.
因果告警相关方法在入侵检测系统中的应用与实现
泽平 秦
计算机科学 , 2008,
Abstract: 针对某公司入侵检测系统产品误警率高,将因果告警相关方法融入到原系统中,对告警信息进行相关分析。利用darpa2000入侵检测场景数据集lldos1.0对新系统进行实验验证,结果表明,通过新系统可有效降低误警率,并可用图形的形式显示告警信息之间的因果相关关系,形象揭示出攻击者的攻击过程与攻击策略。
An Advanced Algorithm for Upstream Resource Allocation in Data Communicatton of CATV Networks
一种基于CATV数据通信上行资源分配的改进算法

付勇,吴中福,,
计算机科学 , 2000,
Abstract: Allocation and Scheduling Algorithms for IEEE 802. 14 in data communication of CATV Networks are complicated,and introduce a trouble that resource is allocated and retrieved repeatedly pcrind of time. This paper introduces virtual allocated minislot. Users need not apply data transmission resource from Head-end every time and can transmit data directly in virtual allocated mireslor. Thus,our method can save the Head-end server's CPU time and memory.then increase the rate of data upstream transmission.
脑信息特征的评价分类方法
毕路,李志祥,,吴平东
北京理工大学学报 , 2005,
Abstract: 对脑信息处理的能力特征量和总体偏离度特征量进行了确定性评价分类.在分类数上,提出了common分类法,以一般人的特征作为分类基准,在common两边展开,以确定分类数.在分类边界上,提出了根据特征量的正态分布确定分类边界的方法.若特征量分布不是正态分布,则采用了博克斯和考克斯变换将其变为正态分布,最终得到能力特征量和总体偏离度特征量的分类规则.由于人的行为是脑信息处理在宏观上的表现,所以其研究成果可直接用来评价人的能力和行为特征.
外侧入路切开复位内固定跟骨关节内骨折的疗效分析
,米占虎,杨海波
宁夏医科大学学报 , 2013,
Abstract: 目的评估外侧入路切开复位固定治疗跟骨关节内骨折的疗效。方法回顾性分析自2007年2月至2011年8月经我院收治资料齐全的跟骨关节内骨折患者70例,所有患者由同一名医师采取外侧入路切开复位钢板螺钉内固定治疗;由另一名未参与过治疗的医师测量并比较患者术前和术后不同时间点的Bohle’s角及Gissane角;按照美国足踝外科协会(AOFAS)踝与后足评分系统评价术后功能恢复情况,计算术后患者症状改善、足部外形、足及踝关节活动度、Bohle’s角的优良率。结果所有患者术后随访3-24个月(平均12个月),68例患者切口一期愈合,2例患者出现伤口表浅感染,所有患者无伤口深部感染发生;骨折愈合时间为6-12周,平均8周;Bohle’s角及Gissane角均得到矫正,AOFAS评分提高,各指标与术前比较差异有统计学意义(P0.05);术后总体优良率83.2%。结论外侧入路切开复位内固定治疗关节内跟骨骨折能够牢固固定并有效维持骨折复位,其疗效满意,外侧入路手术切口设计合理,严格在骨膜下剥离,细致操作下可最大限度减少并发症的发生。
Caspase-1及其激活的IL-18在大鼠急性脊髓组织损伤后的表达及意义
樊涛,丁惠强,,黑龙
宁夏医科大学学报 , 2009,
Abstract: 目的探讨Caspase-1及其激活的细胞因子白细胞介素-18(Interleukin-18,IL-18)在大鼠急性脊髓组织损伤(SCI)后的表达及意义。方法成年雄性Sprague-Dawley(SD)大鼠48只随机分为对照组和脊髓损伤组,每组24只。两组依据损伤后取材时间各再分4个亚组。脊髓损伤组应用改良的Allen’s重物打击法建立大鼠急性脊髓损伤模型,对照组只做T9全椎板切除术。分别于术后6h、1d、3d、7d处死各组大鼠,以损伤部位为中心取材,HE染色观察脊髓组织病理变化,免疫组化染色检测Caspase-1、IL-18的表达情况。结果对照组大鼠脊髓组织中少量细胞Caspase-1、IL-18表达阳性。脊髓损伤后6h,损伤组Caspase-1、IL-18的表达高于对照组,1d继续增高,3d表达最多,7d略有降低,但仍高于对照组。脊髓损伤组各时间点脊髓组织中Caspase-1和IL-18表达阳性的细胞数较对照组显著增高(P<0.01)。结论正常大鼠脊髓组织内存在少量Caspase-1、IL-18的表达。大鼠脊髓损伤后,Caspase-1和IL-18的表达迅速增强。Caspase-1和IL-18的表达增强表明其可能参与了脊髓继发性损伤,并可能是损伤性因素之一。
一种基于catv数据通信上行资源分配的改进算法
付勇 吴中福 秦 康?
计算机科学 , 2000,
Abstract: allocationandschedulingalgorithmsfor1eee802.14indatacomnmnicationofcatvnetworksarecomplicated,andintroduceatroublethatresourceisallocatedandretrievedrepeatedlype-riodoftime.thispaperintroducesvirtualallocatedminislot.user
基于非线性超声调制方法的损伤识别与定位
Damage Detection and Localization Using Nonlinear Ultrasonic Modulation Method

屈文忠,,,肖黎
- , 2016, DOI: 10.16450/j.cnki.issn.1004-6801.2016.05.006
Abstract: 在结构健康监测技术中,非线性弹性波谱方法具有对结构微小变化敏感的特性,能够有效地对裂纹等非线性损伤进行识别。笔者针对采用两个持续激励的普通非线性弹性波谱方法不能定位损伤的问题,提出了一种能够识别并且定位铝板中疲劳裂纹的非线性超声调制方法。该方法通过识别脉冲与高频超声波之间的调制现象来进行损伤检测。实验中,压电阵列粘贴于疲劳裂纹铝板表面,汉宁窗调制的正弦脉冲激励和正弦持续激励同时施加在压电阵列上。通过采集不同的作动传感路径的响应,利用短时傅里叶变换对响应进行频域分析,构造损伤指数量化损伤程度,对疲劳裂纹进行识别和定位。实验结果表明,所提出的方法可以成功地检测并定位疲劳裂纹损伤。
Among structural health monitoring techniques, the nonlinear ultrasonic spectroscopy method is an effective diagnostic approach to detect nonlinear damage, such as fatigue cracking, due to its sensitivity to incipient structural changes. In this paper, a nonlinear ultrasonic modulation method was developed to detect and locate a fatigue crack on an aluminum plate. As opposed to the nonlinear wave modulation method, which recognizes the modulation of low-frequency vibrations and high-frequency ultrasonic waves, the proposed method recognizes the modulation of tone bursts and high-frequency ultrasonic waves. In the experiment, a Hanning window modulated sinusoidal tone burst and a continuous sinusoidal excitation were simultaneously imposed on the piezoelectric array that was bonded to the surface of an aluminum plate. The data was processed with short-time Fourier transform. Both the tone burst modulation and the continuous sinusoidal excitation were observed in different actuator-sensor paths, indicating the presence and location of the fatigue crack. These results showed that the proposed method was capable of successfully detecting and locating the fatigue crack.
资产结构与企业经营绩效的最优化配置研究——以中国飞乐股份有限公司为例
Research on the Optimal Allocation of Assets Structure and Corporation Management Performance——A Case Study of China Feile Co., Ltd.
 [PDF]

, 于诺
Management Science and Engineering (MSE) , 2012, DOI: 10.12677/MSE.2012.14007
Abstract: 本文认为,较之资本结构,资产结构的研究更具实际应用价值和普适意义,它们才是创造公司价值和抵御各项风险的源泉。基于此,本文试图从逻辑和实证两个角度评价资产结构与企业绩效之间的关系,并希望通过评价实证结论的相关性程度,来求得各变量之间的函数方程式。在此基础上,本文再分别进行各变量的曲线拟合,试图通过在建立拟合方程模型的基础上,求出其最优资产配置值。
This paper argues that the research of assets structure has more practical value and universal sig-nificance than capital structure. They are the main source of creating corporate value and warding off risks. As a result, this paper tries to evaluate the relationship between assets structure and business performance through the correlation of the demonstration about listed company. On this basis, the paper separately and then curve fitting each variable, trying to fit in the established model based on the equation, find the optimal asset allocation values. This paper will get the multivariate linear regression equation.
江西省湿地资源现状评价与保护管理对策分析
Wetland Resources Present Situation Evaluation and Protection Management Countermeasure Analysis in Jiangxi Province
 [PDF]

武晓玉,
Hans Journal of Soil Science (HJSS) , 2015, DOI: 10.12677/HJSS.2015.34005
Abstract:
湿地是生态系统中的重要组成部分,掌握湿地资源的动态变化和分布规律,对认识全球气候变化具有重要意义。本研究以CBERS-CCD为主要数据源,通过遥感影像处理和外业调查验证等,得到了江西省湿地资源现状分布情况。通过对湿地数量特征、资源特点、分布规律等进行评价,提出了湿地资源保护管理相关对策,以期为湿地资源的科学保护和合理利用提供科学依据。
Wetland is an important part of ecological system, to master the dynamic change of wetland re-sources and distribution is of great significance to understanding of global climate change. This study, taking CBERS-CCD as the main data source, through the remote sensing image processing and field investigation, etc., obtained the distribution of the present situation of wetland resources in Jiangxi province. It evaluated the wetland resource about quantitative characteristic, resource characteristic and distribution regularities, and put forward the relevant countermeasures of the wetland resources protection and management, in order to provide scientific basis for scientific protection and reasonable utilization of wetland resources.
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