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排序方式: 共有68条查询结果,搜索用时 15 毫秒
1.
针对非正撞击/侵彻情况下的弹体结构动响应预示问题,将球形腔膨胀理论与经验方法结合,提出了一种弹体非正撞击/侵彻动载荷计算的半经验方法。基于本文半经验方法,沿终点弹道计算侵彻弹体的动载荷时间历程,进一步运用模态叠加法求解弹体结构动响应,对多个弹体算例的侵彻过载和应力进行预示并与数值仿真结果对比表明本文方法具有较强适应性,弹体结构最大应力预示结果的相对误差能达到30%左右。 相似文献
2.
为更加真实地模拟芳纶织物在受到冲击时产生的交织阻力变化情况,通过构建一个半经验模型来预测对于不同规格、不同预加张力情况下纱线交织阻力的数值,并设计了可调预加张力的纱线抽拔实验用夹具,分别以织物的经向宽度、纬向宽度和预加张力为变量对纱线进行抽拔实验。实验结果表明:对织物施加横向预加张力与纱线抽拔时的交织阻力呈正相关,预加张力逐渐增大时,织物纬向宽度对交织阻力的影响逐渐增强;反之,交织阻力随着织物的经向宽度的增加会逐渐减小,而相较于经向宽度的影响,织物预加张力对于交织阻力的影响显得更为突出。 相似文献
3.
基于发展风险理念下液化防治技术的需求,推导出了一种基于单变量(UB)的概率计算新方法,提出了以实测标贯击数为主控参数的砂土液化概率评价的半经验半理论方法与新计算公式,并以近期地震大量实测数据对新方法进行了对比检验。研究表明:通过较为成熟的土层液化判定的确定性方法与求解概率的经典数学方法相结合,可解决目前实测资料不具备完备性导致的完全依靠样本回归或学习形成的评价方法的偏差问题,亦可克服采用CSR理论导致的既有液化概率计算方法在砂层埋深超过10 m后不合理的缺点;以2011年新西兰地震中0.23g~0.89g的PGA范围、2~30 m埋深的341组液化实测数据检验,新方法和公式的可靠性和先进性得到了验证。提出的公式已被具有样板规范性质的《建筑工程抗震性态设计通则》修订版采纳,可为相关规范修订及工程应用提供指导与技术支持,同时提出的基于单变量的概率计算新方法对其他多自变量下二分类概率计算问题具有指导与参考意义。 相似文献
4.
在温度343.15~383.15 K、压力14~22 MPa条件下,采用动态法测定分散紫27、分散蓝72在超临界CO2中的溶解度。并采用Chrastil半经验模型和AdMST半经验方程对实验结果进行关联,探讨影响分散染料在超临界CO2中溶解度的因素。结果表明:分散紫27在超临界CO2中的溶解度为2.69×10-6~7.35×10-6 mol/mol,压力越高,CO2密度越大,分散紫27在超临界CO2中的溶解度越高;随着温度的升高,分散紫27的溶解度先升高后降低;分散蓝72在超临界CO2中的溶解度为7.17×10-6~13.38×10-6 mol/mol,且随着温度的升高而升高,随着压力的升高而升高。 相似文献
5.
The solubility of tri-iso-amyl phosphate (TiAP) in supercritical carbon dioxide (SCCO2) was determined at 313–333 K with pressure ranging from 10 to 25 MPa. The solubility data of TiAP in SCCO2 medium were correlated using four semi-empirical models. Selective extraction of uranium from simulated dissolver solution was demonstrated using SCCO2 modified with TiAP. The extraction efficiency of uranium was found to be 95 ± 5%. The influence of temperature, pressure and acidity on the extraction of uranium was studied. An attempt was made to explain the plausible extraction mechanism. 相似文献
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8.
《Journal of Nuclear Science and Technology》2013,50(10):1030-1037
Abstract The cross section of the (n, p) reaction for unstable target nuclide 60Co was estimated by a multi-step Hauser-Feshbach model code with pre-equilibrium correction. Parameters used in the model calculations were determined from the fitting of the cross sections to existing experimental data of (n, p), (n, α) and (n, 2n) cross sections and particle emission spectra for the adjacent stable nuclide 59Co. The present result for 60Co(n, p)60Fe was compared with the values estimated from semi-empirical formulae around 14 MeV, The prediction accuracy of the present calculation is considered to satisfy the requirement for the fusion reactor applications. The theoretical model calculations with a reliable parameter set are recommended rather than the semi-empirical formulae for the important activation cross sections of exotic target nuclei including unstable ones. 相似文献
9.
In this study, we have investigated the asymmetry term effect for the (n, d) reaction cross sections at 14–15 neutron incident energy. It has been discussed the odd–even effect and the pairing effect
considering binding energy systematic of the nuclear shell model for the new experimental data and new cross section formulae
developed by Tel et al. for (n, d) reactions. We have determined different parameter groups by the classification of nuclei into even–even, even–odd and odd–even
for (n, d) reactions cross sections. The obtained empirical and semi-empirical formulae by fitting two parameters for (n, d) reactions were given. By using the new cross sections formulae for (n, d) reactions the obtained results have been discussed and compared with the available experimental data. 相似文献
10.
In the hybrid reactor, tritium self-sufficiency must be maintained for a commercial power plant. For self-sustaining (D-T)
fusion driver tritium breeding ratio should be greater than 1.05. Working out the systematics of (n, t) reaction cross-sections are of great importance for the definition of the excitation function character for the given reaction
taking place on various nuclei at energies up to 20 MeV. In this study we have investigated asymmetry term effect for the
(n, t) reaction cross-sections at 14–15 neutron incident energy. It has been discussed the odd–even effect and the pairing effect
considering binding energy systematic of the nuclear shell model for the new experimental data and new cross-sections formulas
(n, t) reactions developed by Tel et al. We have determined a different parameter groups by the classification of nuclei into even–even,
even–odd and odd–even for (n, t) reactions cross-sections. The obtained empirical and semi-empirical formulas by fitting two parameter for (n, t) reactions were given. All calculated results have been compared with the experimental data and the other semi-empirical
formulas. 相似文献