An inventory model with truncated exponential replenishment intervals and special sale offer

In this study, we develop an inventory model with stochastic replenishment intervals and special sale offer from a supplier. The replenishment interval is assumed to obey a truncated exponential distribution and shortage is partially backordered. Our goal in this research is to maximize the total profit of cost savings due to special sale offer from supplier. A closed-form solution of the model and its convexity condition is developed. A numerical example with real world data is provided to illustrate the theory.     

Construction of CO3O4 derived ZIF/GO electrode for outstanding stability in supercapacitors devices

The growing global demand for energy supply and environmental protection has led to the use of high-efficiency energy storage devices, which supercapacitors are used as one of these devices with high storage capacity and exceptional stability. To be used for this purpose, an easy and rapid synthetically method was used to produce the CO₃O₄/GO nanocomposite, and its electrochemical performance as the electrode material in hybrid-supercapacitors was further investigated. In this nanocomposite, the CO₃O₄ crystals with less than 500 nm particle size are uniformly in contact with the wrinkled GO sheets, that their structure and morphology were investigated by surface analyzes. In addition, the functional groups, crystallographic properties, and elemental composition were investigated using the FTIR, XRD, and EDX analyzes. To confirm the supercapacitive effectiveness of the prepared samples, the electrochemical measurements (EIS, CV, and GCD) were done. The results have shown that the values of specific capacity, energy and power densities of Co₃O₄/GO hybrid nanocomposite are 234 mAh g^?1, 16.075 W h kg^?1 and 251 W kg^?1, respectively. Also, the Co₃O₄/GO has the lowest amount of resistance compared to other electrodes. Nearly constant efficiency at 104% after 1000 cycles indicates that the nanocomposite has excellent cyclic stability. The proper electrochemical efficiency of the nanocomposite corresponds to the synergistic effect on the composition.     

屏边苗式建筑风格及建设初探

考察屏边建筑特色风貌,总结了屏边在打造特色风貌县城建设方面的成功经验,对县城风貌建设提出合理化建议。     

花瑶挑花文化传承的问题及对策

通过文献调查、田野调查、问卷调查了解并分析了花瑶挑花的背景及文化传承现状,总结了花瑶挑花的艺术特点。并针对存在的问题提出了在当地中小学开设特色课程,将花瑶挑花的艺术特点编入教材内容,提高传承人素养,利用网络进行艺术宣传或销售等建议。     

矿区专用铁路开采沉陷预计及治理系统研究

在矿区铁路下进行放顶煤开采所引起的地表及铁路的变形量大，变形速度快，从而导致矿区铁路维护困难。如果在开采前及开采过程中对地表及铁路的变形预计不准确，维修措施不当，将无法保证矿区铁路的正常运输，甚至出现安全行车事故。为此，研究开发了综采放顶煤条件下铁路开采沉陷预计及其治理系统，该系统通过对地表及铁路的变形进行较为准确的预计，可提出铁路线路及道岔的维修治理措施。     

高耐磨合金柱及专用焊接设备

高耐磨合金柱及专用焊接设备是一种新型的磨损防护系统，它是在易磨损工作面上采用特殊焊接方式（无需任何焊条）焊接高耐磨合金柱。该设备的研制成功可使易磨损工作部件的使用寿命提高３～４倍，可从人力、物力、电力等方面大大降低工业成本及辅助作业成本，降低劳动强度，提高生产效率。试验证明，高耐磨合金柱及专用焊接设备是一种高效、实用、低成本的提高设备耐磨性能的方法和设备。     

KJC－2型矿山机械工程检修车

ＫＪＣ－２型矿山机械工程检修车是集机械设备状态监测与故障诊断研究实验室和修理车间两大功能于一体的大型自行式设备．本文介绍其基本结构与装备、性能参数、适用范围和使用条件．     

酒钢选矿厂焙烧磁选系统改造实践

介绍了酒钢选矿厂焙烧磁选系统实施竖炉高效节能风机改造、特种水力旋流器与格子型球磨机组合应用于一段闭路磨矿、用BX型磁选机改造传统弱磁选机以及使用矩环式磁选机回收尾矿中铁矿物的实践，通过改造，主要技术经济指标得到进一步提高。     

散体连续流动特殊方程及放矿理论的检验

对散体只按一般连续性方程进行流动检验是不够的，通过对单位时间、单位高度散体移动范围内应遵守质量守恒定律的研究，建立了散体连续流动的特殊方程(特殊连续性方程)；提出对于散体应该进行2个内容的连续流动检验：一般连续性方程检验和特殊连续性方程检验，并对主要放矿理论进行了特殊连续性方程检验。结果表明：类椭球体放矿理论能通过特殊连续性方程检验。     

养老保险基金管理中需加强的几个问题

养老保险基金工作是建立健全社会保障体系，发展市场经济、维护社会稳定的需要。因此，党中央、国务院高度重视养老保险基金的管理工作，文章从六个方面论述了养老保险基金管理中应需加强的问题。