Group Contribution based Flammability Limit Estimation of Hydrocarbon-Inert Gas Mixture

As group contribution method is easy to apply and has a wide application range,current study has developed this model to predict flammability limit of hydrocarb...     

军用电子元器件的选择和使用

随着武器装备的不断发展, 电子元器件, 尤其是微电子器件在海军装备上的应用越来越广泛, 电子元器件的选择和使用就日益显得重要。本文结合军用电子产品元器件选择和使用的实际情况, 着重就元器件选择和使用过程中的采购、筛选、破坏性物理分析以及失效分析进行了探讨, 给出了元器件的选择和使用准则以及全过程流程图。     

基于层次分析法的城市反空袭防护目标选择

通过对防护目标的选定因素分析,城市反空袭防护目标指标体系包括目标层、准则层及措施层.利用层次分析法(AHP)法选定城市反空袭中的防护目标,形成数据表、建立并求解判断矩阵及一致性检验,以获得选择最优保护目标的排序权重.经实际运用,所建立的指标体系和方法更有利于合理、科学地选择防护目标.     

刚性弹丸对多层复合靶的侵彻分析

本文研究了刚性球形弹丸对间隔靶或多层靶的侵彻问题,这些靶由不同的材料构成.给出了弹丸与靶体相互作用的模型,由它计算出了相互作用的表面在每个时间增量时的变化状态,从而可获得靶的阻力,将这些代入到弹丸的运动方程中,即可得到一个完整的弹丸在击穿靶或未击穿靶时的弹道轨迹.其中靶的阻力从广义的Poncelet方程中求得.这样,经典的静力学和动力系数与靶的材料特性就通过弹腔扩张模型联系起来,所得到的实验结果与计算的穿透结果吻合的较好.     

Robustness of interdependent multi-model addressing networks

Dear editor, Many complicated real-world systems can be considered as complex networks to analyze their macroscopic properties,e.g.,the Internet,power grids,and...     

Electrolyte/Structure?Dependent Cocktail Mediation Enabling High?Rate/Low?Plateau Metal Sulfide Anodes for Sodium Storage

As promising anodes for sodium-ion batteries, metal sulfides ubiquitously suffer from low-rate and high-plateau issues, greatly hindering their application in f...     

含铜和镍电镀污泥还原氨浸工艺及反应动力学分析

采用还原氨浸工艺实现电镀污泥中铜、镍的浸出。在20%(质量分数)氨水+0.3 mol/L (NH₄)₂CO₃+0.4 mol/L Na₂SO₃的浸出体系中,当固液比为1∶15,在70℃下浸出3h,铜、镍的浸出率别为95.84%和90.12%。反应动力学分析表明,氨-碳酸铵-亚硫酸钠体系浸出电镀污泥中铜、镍受界面传质和固体膜层扩散共同控制。     

Interactions between hotspots and the Southwest Indian Ridge during the last 90 Ma:Implications on the formation of oceanic plateaus and intra-plate seamounts

This study investigates the relationship between the hotspot-ridge interaction and the formation of oceanic plateaus and seamounts in the Southwest Indian Ocean.We first calculated the relative distance between the Southwest Indian Ridge (SWIR) and relevant hotspots on the basis of models of plate reconstruction,and then calculated the corresponding excess magmatic anomalies of the hotspots on the basis of residual bathymetry and Airy isostasy.The results reveal that the activities of the Marion hotspot can...     

氯化钾结晶器搅拌选型探研

反浮选冷结晶氯化钾生产的关键在于DTB结晶器中的控速分解和控速结晶,而控速的关键在于搅拌器的调速,因此本文通过对搅拌工作原理、类型及机理的粗浅分析,在保证不影响分解和结晶速率的情况下选用合适的搅拌型式,生产实践证明:推进式轴流型搅拌较之折叶式径漉型搅拌在提高氯化钾产品的粒度方面有极大的优越性.     

Supervised land cover classification based on the locally reduced convex hull approach

A novel supervised learning approach, called the locally reduced convex hull (LRCH), is proposed for land cover classification. The method described is capable of increasing the class separability and the representational capacity of the training set, which leads to its high generalization ability in applications. The effectiveness of the LRCH is demonstrated on the classification problem of a multi-spectral data set. In experiments, the LRCH was compared with six common classifiers. Statistical results in terms of the overall accuracy, the Kappa coefficient and McNemar's test show that LRCH outperforms most of the other approaches, with a speed that is comparable to all of them.