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91.
东海西湖凹陷探井钻井完井液技术   总被引:2,自引:2,他引:0  
介绍了东海西湖凹陷的储层特征。在分析探井储层损害原因的基础上,提出了优化的海水钻井完井液体系。两口井应用表明,储层保护效果明显。  相似文献   
92.
水保种草有山地治理、改土开发、松林改造、封禁培育四种类型,是水土保持主要植物措施之一,见效快,效果好,效益显著。要提高认识,建立基地。做好草的转化利用.  相似文献   
93.
Responsiveness, the ability to detect meaningful clinical change, is a critical attribute of instruments used to evaluate outcomes of treatments. The authors hypothesized that self-administered symptom severity and functional status questionnaires are more responsive to clinical improvement after carpal tunnel release than traditional physical examination measures of strength and sensibility. Data were obtained from a randomized clinical trial of endoscopic versus open carpal tunnel release conducted in four university medical centers. Patients were evaluated before surgery and 3 months after surgery. Seventy-four patients indicating that they were more than 80% satisfied with the results of surgery were assumed to have clinically meaningful improvement and were the focus of the analysis. Evaluations included questionnaires assessing symptom severity, functional status, and activities of daily living as well as measurement of grip, pinch, and abductor pollicus brevis strength, and 2-point discrimination and Semmes-Weinstein pressure sensibility. Responsiveness was calculated with the standardized response mean (mean change/standard deviation of change) as well as the effect size (mean change/standard deviation of baseline values). The symptom severity scale was four times as responsive, and the functional status and activities of daily living scales were twice as responsive, as the measures of strength and sensibility. Self-administered symptom severity and functional status scales are much more responsive to clinical improvement than measures of neuromuscular impairment and should severe as primary outcomes in clinical studies of therapy for carpal tunnel syndrome.  相似文献   
94.
瞬态光的光电摄谱测量   总被引:3,自引:0,他引:3  
“光电摄谱法”是一种辐射光谱计量参数的测量方法,此法解决了单次脉冲闪光灯辐射光谱相对能量分布的精确测量问题。本文介绍了这种方法的测量原理、方法和特点,同时阐述了对接收器件、光路系统和时控电器系统的要求,并以自行研制的闪光光谱测定仪为例,对其计量参数波长和相对能量的标定与校正给予了必要的讨论,最后以实测结果证实了该方法的可靠性。  相似文献   
95.
Lossless compression techniques are essential in archival and communication of medical images. Here, a new segmentation-based lossless image coding (SLIC) method is proposed, which is based on a simple but efficient region growing procedure. The embedded region growing procedure produces an adaptive scanning pattern for the image with the help of a very-few-bits-needed discontinuity index map. Along with this scanning pattern, an error image data part with a very small dynamic range is generated. Both the error image data and the discontinuity index map data parts are then encoded by the Joint Bi-level Image Experts Group (JBIG) method. The SLIC method resulted in, on the average, lossless compression to about 1.6 b/pixel from 8 b, and to about 2.9 b/pixel from 10 b with a database of ten high-resolution digitized chest and breast images. In comparison with direct coding by JBIG, Joint Photographic Experts Group (JPEG), hierarchical interpolation (HINT), and two-dimensional Burg prediction plus Huffman error coding methods, the SLIC method performed better by 4% to 28% on the database used  相似文献   
96.
Multiresolution learning paradigm and signal prediction   总被引:4,自引:0,他引:4  
Current neural network learning processes, regardless of the learning algorithm and preprocessing used, are sometimes inadequate for difficult problems. We present a new learning concept and paradigm for neural networks, called multiresolution learning, based on multiresolution analysis in wavelet theory. The multiresolution learning paradigm can significantly improve the generalization performance of neural networks  相似文献   
97.
本文在局部凸Hausdorff线性拓扑空间中讨论了一类不可微的凸规划,得到了Kuhn-Tucker最优性条件和对偶定理。  相似文献   
98.
本文介绍一种宽带单向器的原理及设计。选用TGG作磁旋光介质,旋光石英晶片作补偿片,所设计的色散补偿型宽带单向器预计可在700~1000nm波长范围内实现环行激光腔中的单向行波运行;将其应用在可调谐环行Ti:Al2O3激光器中,获得了良好的实验结果。  相似文献   
99.
容错磁盘阵列的性能模型   总被引:1,自引:1,他引:0  
本文以排队论为工具,建立了容错磁盘阵列的M/G/1排队模型,并在此基础上分析了RAID的平均响应时间,稳定数据传输率等重要性能指标;比较了同步和异步RAID的性能差异,最后提出了以吞吐率作为衡量RAID性能的综合指标,并给出了确定最大吞吐率的定量。  相似文献   
100.
Effects of oxide additives on sheet resistance of W thick-film conductor   总被引:3,自引:0,他引:3  
A multilayer AIN-W cofired body has been developed using the pressless sintering technique. Effects of additives, such as Y2O3, CaO, La2O3, MgO, Al2O3 and SiO2, on the sheet resistance of W conductor were studied. The sheet resistance of the W conductor increases with increasing additives in the W paste. However, the oxides can be divided into two groups. The effect of the first group on sheet resistance is different from that of the second group.  相似文献   
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