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Search Results: 1 - 10 of 125289 matches for " 朱佩平 "
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x射线相位衬度成像
,吴自玉
物理 , 2007,
Abstract: ?文章使用形象、生动、通俗、易懂的语言,介绍x射线相位衬度成像的基本概念,物理思想和方法,其中包括x射线的基本性质、光的波粒二象性、同步辐射x射线光源和常规非相干x射线光源的相位相干性,以及x射线相位衬度成像方法、三维成像的基本原理和相位衬度成像的最新进展,将抽象的相位、相位一阶导数和相位二阶导数概念与形象的光波阵面平移、倾斜和弯曲等形变联系在一起,着重介绍相位衬度成像发展中的创新思想,力图使读者能分享人类文明在这个学科发展中积累的精神财富.
衍射增强成像中余弦曲线拟合方法的噪声分析
鲍园,王研,,吴自玉
核技术 , 2015, DOI: 10.11889/j.0253-3219.2015.hjs.38.090101
Abstract: 衍射增强成像是一种功能强大的相位衬度成像技术,其信息分离研究一直都是研究热点。提出了一种简便的信息分离方法——余弦曲线拟合法(CosineFittingRadiography,CFR),该方法具有简便、样品所受辐射剂量低等优点。利用同步辐射实验和蒙特卡罗仿真方法,从角度信号成像模型出发解释了此方法,同时从噪声传递角度分析了该方法的性能和给出定量的评价指标,建立了衍射增强成像和光栅微分干涉成像之间更直观的联系。对理解衍射增强成像系统的噪声行为和提高信噪比具有一定的参考意义。
儿童阻塞性睡眠呼吸暂停低通气综合征与部分血清生化指标的相关性分析
Correlative analysis of obstructive sleep apnea hypopnea syndrome and biochemical markers in children

,刘德中,潘崇
- , 2018, DOI: 10.7507/1671-6205.201705030
Abstract: 目的 探讨儿童阻塞性睡眠呼吸暂停低通气综合征(OSAHS)与生化指标的相关性。 方法 选取 2015 年 1 月至 2017 年 2 月收治的 OSAHS 患儿 78 例为观察组,并选取同期的 100 例正常儿童体检者作为对照组。检测两组儿童的血清丙氨酸转移酶(ALT)、血尿素氮(BUN)、总胆固醇(TC)、甘油三酯(TG)、肌酸激酶同工酶(CK-MB)、心肌肌钙蛋白 I (cTnI)、空腹血糖(FPG)水平,对比两组儿童各项生化指标的均值和阳性率。 结果 各项生化指标的均值对比结果显示,除 BUN 和 FPG 外,观察组患儿的 ALT [(52.1±26.2)U/L 比(41.3±18.5)U/L]、TC [(4.9±0.9)mmol/L 比(4.3±0.8)mmol/L]、TG [(1.4±0.7)mmol/L 比(1.0±0.4)mmol/L]、CK-MB [(24.3±9.5)U/L 比(11.2±8.2)U/L]、cTnI [(1.4±0.7)μg/L 比(1.0±0.6)μg/L]水平与对照组相比差异均有统计学意义(均 P<0.05);阳性率比较结果与均值比较结果相一致,除 BUN 和 FPG 外,观察组患儿的 ALT(48.7% 比 14.0%)、TC(24.4% 比 8.0%)、TG(23.1% 比 8.0%)、CK-MB(41.0% 比 11.0%)、cTnI(34.6% 比 7.0%)阳性率与对照组相比差异均有统计学意义(均P<0.05)。 结论 OSAHS 患儿存在明显的心脏功能和肝功能受损,表现出一定程度的血脂代谢紊乱。这些异常指标可能与 OSAHS 的发生发展互为因果。应当重视 OSAHS 患儿的生化指标检测。
Objective To investigate the correlation between obstructive sleep apnea hypopnea syndrome (OSAHS) and biochemical indexes in children. Methods Seventy-eight children with OSAHS in our hospital from January 2015 to February 2017 were recruited as an observation group, and 100 normal children who underwent physical examination were selected as a control group in the same period. The mean values and positive rates of biochemical markers were compared between two groups including alanine aminotransferase (ALT), blood urea nitrogen (BUN), total cholesterol (TC), triglyceride (TG), creatine kinase isoenzyme (CK-MB), cardiac troponin I (cTnI), fasting blood glucose (FPG) level. Results The mean values of biochemical indexes showed significant differences between the observation group and the control group except BUN and FPG [ALT, (52.1±26.2) U/L vs. (41.3±18.5) U/L; TC, (4.9±0.9) mmol/L vs. (4.3±0.8) mmol/L; TG, (1.4±0.7) mmol/L vs. (1.0±0.4) mmol/L; CK-MB, (24.3±9.5) U/L vs. (11.2±8.2) U/L; cTnI, (1.4±0.7) μg/L vs. (1.0±0.6) μg/L] (all P<0.05). The positive rates also showed significant differences between the observation group and the control group except BUN and FPG [ALT (48.7%vs. 14.0%), TC (24.4% vs. 8.0%), TG (23.1% vs. 8.0%), CK-MB (41.0% vs. 11.0%), cTnI (34.6% vs. 7.0%) (all P<0.05). Conclusions The cardiac function and liver function are significantly impaired in children with OSAHS, showing the disorder of lipid metabolism to some extent. These abnormal indexes may be the occurrence and development of OSAHS. More attention should be paid to the detection of biochemical indexes in children with OSAHS.
流域水土保持监测数据管理系统研究
Research on Data Management System of Soil and Water Conservation Monitoring in Watershed
 [PDF]

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Computer Science and Application (CSA) , 2016, DOI: 10.12677/CSA.2016.66046
Abstract: 以海河流域水土保持动态监测数据为基础,采用面向服务架构(SOA)的设计思想,综合应用3S技术、元数据、海量数据存储等技术和二次开发方法,构建流域水土保持监测数据管理系统。该系统实现了基础数据管理、动态监测、海河流域ET(蒸发蒸腾)、普查数据管理和监测数据对比等功能。其成功运行为水土保持工作提供信息服务和分析手段,实现了水土保持信息规范化、现代化的管理和共享,全面提高了水土保持机构管理和服务水平,同时为水土保持监测数据管理提供良好的信息平台和科学依据。
The data management system for soil and water conservation monitoring is based on the dynamic monitoring data of soil and water conservation in Haihe river basin, which adopts the design idea of the service oriented architectures (SOA), applies 3S technology, metadata, mass data storage technology and method of secondary development to construct basin soil and water conservation monitoring data management system. This system has realized the basic data management, dy-namic monitoring, ET (evaporation and transpiration), census data management and monitoring data comparison and other functions. The operation of the system provides information service and analysis means for soil and water conservation work, realizes the information standardization of soil and water conservation, improve the soil and water conservation organization management and service level comprehensively. At the same time, it provides a good information platform and scientific basis for the management of soil and water conservation monitoring data.
小鼠急性脑损伤后微量脑脊液谷氨酸浓度的测定
李玮,安建宏,,熊仁,周元国
第三军医大学学报 , 2006,
Abstract:
湖南郴州市新型城镇化与新型工业化协调发展研究
肖海a,b肖地楚b,芬a
地域研究与开发 , 2015,
Abstract: 基于新型城镇化与新型工业协调发展内涵,构建了新型城镇化与新型工业化协调发展综合评价指标体系。采用主成分分析法和模糊数学法测度了郴州市11个县域新型城镇化与新型工业化综合评价指数及其协调度。研究结果表明:郴州市新型城镇化与新型工业化协调度总体上处于“双低型”协调发展状态或不同程度的失调状态;空间分布上,处于低水平协调度状态或不同程度失调状态的县域主要分布在郴州市主要交通干线途经地区,而协调度高的县域则分布于郴州市边缘地区,究其原因是新型工业化水平影响了两者协调度水平及其空间分布。据此提出了郴州市新型城镇化与新型工业化协调度提升及其空间布局优化的策略。
rct论文统计学报告自查清单与报告指南的应用与评价
刘清海?,方积乾?,甘章,玲?,常湘珍?
中国科技期刊研究 , 2009,
Abstract:
同步辐射衍射增强应用于慢性肾小球肾炎模型的研究
夏琛琛,ARUNKumarYadav,张凯,彭屹峰,袁清习,
- , 2015, DOI: 10.16118/j.1008-0392.2015.06.005
Abstract: 目的 应用同步辐射(synchrotron radiation, SR)衍射增强(diffraction enhanced imaging, DEI)对兔慢性肾小球肾炎(chronic glomerulonephritis, CGN)模型病变进行模型研究。方法 采用盐酸阿霉素以17mg/kg的2次注射量,2个月后5只新西兰大白兔慢性肾小球肾炎模型形成。抽取血液做肾功能检查,尿液做尿常规检查,切片做病理检查。动物处死后肾组织固定在4%福尔马林溶液里,准备DEI实验。另取5只正常的兔子做对照组。本实验在北京同步辐射装置4W1A X线实验站(射束能量14keV)进行。取摇摆曲线的腰位,做360度旋转平扫,同时取背景图像。最后用衍射成像软件重建图像,用MATLAB分析CGN和对照组病变区间的灰度差异。结果 在没有静脉注射成像对比剂条件下,DEI方法能清楚地显示两组肾脏微结构,包括动静脉系统,集合管,髓袢及肾小球,其空间分辨率达10μm。CGN组(91~112)的平均肾皮质比对照组(121~141)丢失较多、灰度值、T检验P<0.05。相同皮质感兴趣区(数据点450×80)灰度值定量分析,CGN组总灰度值(55~160)小于对照组(75~175)。DEI图像和病理图像有较多相似性,CGN组的病变微结构得以显示,归功于DEI相位成像(phase-contrast imaging, PCI)的原理优势,从而使应用SR DEI对CGN进行诊断的可能得以成为现实。结论 同步辐射衍射成像实验是一种新的影像学方法,结果表明,影像学形态的变化较CT、MRI、超声更细致明确,它使无创伤、无对比剂的慢性肾小球肾炎的动物模型诊断成为可能。未来随着实验设备的提高和图像分析操作的简易化,DEI很可能在临床上成为CGN诊断的一种新方法。
Objective To investigate microstructural changes in chronic glomerulonephritis(CGN) under diffraction enhanced imaging(DEI) technology of synchrotron radiation(SR) in rabbit model. Methods Chronic glomerulonephritis(CGN) was induced by injection of doxorubicin hydrochloride in 5 New Zealand white rabbits. The blood and urine tests and kidney histological examination were performed 2 months after CGN induction. The kidney tissues were fixed into 4% formalin solution for one week before DEI experiment. The experiment was performed at Beijing Synchrotron Radiation Facility(BSRF) 4W1A beam line(beam energy was 14keV). On routine scanning process, the rocking curve was detected, and slope position on the curve was selected for a 360° spatial CT scan, at last the DEI reconstruction software was applied for 3-dimensional image, meanwhile the DEI image grey value between chronic CGN group and control group was analyzed by MATLAB and SPSS. ResultsWithout radio-contrast, DEI provided clear visibility of the microstructural views of artery, vein, straight collecting ducts, papillary tubules, glomeruli of kidneys in both groups, with the spatial resolution of 10μm. The cortex of CGN lost more gray value comparing to the normal one. There was good correlation between DEI images and histopathological images. The microstructural change of CGN kidney was revealed, which was based on the advantage of phase-contrast imaging(PCI) mechanism, and the diagnosis value of CGN by synchrotron radiation(SR) phase-contrast imaging(PCI) technology was evaluated.Conclusion Synchrotron radiation diffraction enhanced imaging(DEI) provides non-invasive and non-contrast diagnosis of CGN in animal model, which may used in clinical diagnosis after further improvement
沙门氏菌属的一个新血清型
刘湘,,孙嘉谦,李福田,高杰谦,,张莉
微生物学报 , 1988,
Abstract: 从鳝鱼的标本中分离出一株沙门氏菌757,经鉴定为一新血清型。其生化特性符合沙门氏菌属的定义。根据该菌株卫矛醇反应阴性,丙二酸钠、乳糖、ONPG反应阳性,将其归属于沙门氏菌亚种IIIb。757菌株的“O”抗原为43123345,“H”第一相抗原为Z32,第二相抗原为e,n,x,z15。抗原式为43:z,52: e n,x,z15。
台风螺旋雨带的数值模拟研究

科学通报 , 2005,
Abstract: 螺旋雨带是台风的基本特征之一. 近年来螺旋雨带发生机理的涡旋 Rossby 波理论已得到普遍的认同, 但对螺旋雨带的内部结构还没有详细的研究. 利用 MM5(V3)对2002 年 8 月给厦门带来特大暴雨的强热带风暴 Kammuri 的螺旋雨带作了数值模拟. 结果表明, 模拟螺旋雨带沿方位角的移速与涡旋Rossby 波的理论波速一致, 并伴随着能量在径向的频散. 从模式输出的高分辨率的多种物理参数数据集中分析出的螺旋雨带结构表明, 台风中的气旋式涡度、垂直运动、水平动量等都高度集中在螺旋雨带中. 并进一步指出, 螺旋雨带的水汽主要来自 1 km 以下, 而且来自外侧的空气具有明显的对流性不稳定, 它为螺旋雨带中对流的发展提供了不稳定能量. 螺旋雨带内侧空气的层结是中性的, 说明不稳定能量已经释放. 螺旋雨带的外侧存在风速高达 30 m/s 以上的中尺度强风带, 它的产生和外侧的空气向螺旋雨带流入时气压梯度力所起的加速作用有关.
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