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排序方式: 共有48条查询结果,搜索用时 31 毫秒
1.
较系统地研究了特定条件下Fe活化箔活化γ谱测量及解谱等相关技术,包括高阈能探测器的自吸收、自屏蔽、扰动等影响。分析了实验测量和蒙卡计算结果,并对结果进行了讨论。 相似文献
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Tongxin Wang Jun Zhang Wei Ma Yanhua Luo Lijuan Wang Zhijia Hu Wenxuan Wu Xin Wang Gang Zou Qijin Zhang 《Solar Energy》2011,85(11):2571-2579
Luminescent solar concentrator (LSC) employing Eu(TTA)3(TPPO)2 (europium tris(2-thenoyl trifluoro acetonate)-di(triphenylphosphine oxide)) was fabricated in our work firstly, and then its current–voltage (I–V) performance under AM1.5G radiation with different radiation area were measured and compared with that of LSC employing dye. As there is no overlap between absorption spectrum and fluorescence spectrum of Eu(TTA)3(TPPO)2, it is found that the power conversion efficiency of LSC employing Eu(TTA)3(TPPO)2 decreases ten times slower than that of LSC employing dye reported with the increment of radiation area under AM1.5G. To accurately characterize the zero self-absorption loss of LSC employing rare earth complex more, external quantum efficiency (EQE) was also measured and simulated theoretically. When experiment data is compared with theoretical simulation, the measured EQE data at 380 nm is found to well coincide with theoretical result by taking host absorption loss into consideration. And the conclusion could be drawn that rare earth complex obviously shows zero self-absorption loss in use of LSC system and is proposed as a potential candidate for increasing the LSC efficiency. 相似文献
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为了解决激光诱导击穿光谱技术(LIBS)的自吸收效应所导致的测量精度降低问题,将LIBS与偏最小二乘回归法(PLS)结合后建立分析模型以有效应用于煤炭灰分的检测。在传统的PLS模型基础上考虑谱线自吸收的影响,根据自吸收后的谱线强度与浓度之间的非线性关系,增加基于谱线强度的平方项并提出谱线自吸收效应的非线性PLS模型。经过自吸收修正后的PLS模型,预测样品的平均误差从1.696%降至1.504%,最大误差从5.780%降至3.507%,模型的预测性能和泛化能力得到了显著提升。 相似文献
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对具有一定几何尺寸的样品进行γ谱分析时,样品自身对γ射线的吸收影响对核素含量的精确测量。本文在对比国内外关于自吸收修正因子计算方法的基础上,分析了被广泛采用的简化计算模型存在的问题及对修正结果的影响。基于混合蒙特卡罗模拟的思想,提出了自吸收修正因子的精确计算模型,并使用FORTRAN程序进行了随机抽样和积分计算,得到精确的自吸收修正因子。通过加标样品及不同质量标准源的对比测量,将精确计算模型与简化计算模型和无源效率校准软件计算结果进行了对比分析。结果表明,简化计算模型过高评估了自吸收干扰,而精确计算模型计算结果与实验测量结果及无源效率校准软件计算结果具有较好的一致性,相对偏差不大于5%。最后针对核电厂周围环境中主要关注的γ核素,使用精确计算模型得到了不同γ核素在土壤中的自吸收修正因子。 相似文献
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介绍了火焰原子吸收光谱(FAAS)和石墨炉原子吸收光谱(GFAAS)背景吸收干扰的特点,讨论了氘灯连续光源背景校正,塞曼效应背景校正,自吸收效应背景校正的原理和优缺点,对现代原子吸收分光光度计中各种背景校正方式的发展进行了综述。 相似文献
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Yb:YAG激光器特性 总被引:3,自引:0,他引:3
从Yb:YAG的晶体结构、特性出发系统地介绍了Yb:YAG激光器的运转特性。着重阐述了自吸收效应对调谐输出特性的影响、空间烧孔效应对宽度可调激光脉冲产生的限制,以及Yb:YAG激光器可调谐特性和自调Q性能。 相似文献
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Lina Al Attar Jamal Al Abdullah Wael Doubal Bassam Safia Basem Abdul Ghani Hussam Khalily 《仪器科学与技术》2014,42(5):562-575
This study focuses on the evaluation of self-attenuation correction factors (Cf) and linear?attenuation coefficients (μ) of scale samples, produced from the oil fields. This was performed using 152Eu point source at the optimal geometry found (i.e., 3 mm). The scale samples were of apparent density ranging 1.04 ? 3.08 g cm?3. The results illustrated that self-attenuation correction values were as high as 5.08 for the most dense samples at γ-energy line of 45.5 keV. High correlation was observed by Pearson matrix between self-attenuation correction factor and sample density (correlation coefficient of 0.967 at γ-energy of 45.5 keV). A simplified model of the relationship between these variables was proposed. The remarkable finding was that when scale sample density increased self-absorption extended to occur to a higher energy line. Hence, self-attenuation correction was negligible at γ-energies of 122, 222, and 344 keV for samples with density ranging 1.04–1.41, 1.45–2.04, and 2.12–3.08 g cm?3, respectively. Since linear attenuation coefficient is material sensitive, it was calculated for each sample. Analysis of variance (ANOVA) reflected the linear relationship between linear-attenuation coefficient and sample density up to 344 keV which disappeared thereafter. The data obtained allowed an accurate determination of the concentrations of γ-emitters in scale samples within the energy range of 45.5–1408 keV. 相似文献