一种新型地雷战斗部的数值模拟研究

针对地雷的毁伤目标和特性,提出一种新颖的多棱柱状药型罩结构,其可看作由八个楔形罩对称排列相邻连接而成。应用非线性有限元软件完成了爆炸载荷下多棱柱状药型罩形成射流过程的数值模拟,结果表明新型药型罩结构能够实现预期设想,形成一股汇聚射流。研究结果为地雷战斗部研究提供了一种新的选择。     

Liner services network design and fleet deployment with empty container repositioning

Transportation demand of shipping container fluctuates due to the seasonality of international trade, thus, every 3–6 months, the liner company has to alter its current liner shipping service network, redeploy ships and design cargo routes with the objective of minimizing the total cost. To solve the problem, the paper presents a mixed integer linear program model. The proposed model incorporates several relevant constraints, such as weekly frequency, the transshipment of cargo between two or more service routes, and transport time. Extensive numerical experiments based on realistic date of Asia–Europe–Oceania shipping operations show that the proposed model can solve real-case problems efficiently by CPLEX. The results demonstrate that the model can reduce ship’s capacity consumption and raise ships’ capacity utilization.     

耐火纤维喷涂技术的优越性及应用

详细介绍了耐火纤维喷涂技术及施工等各方面的优越性。同时说明耐火纤维喷涂技术,在大庆石化公司炼油厂润滑油白土装置扩建改造中加热炉炉衬上的应用及取得的明显节能效果。     

A review of the sponge iron process for the storage and transmission of remotely generated marine energy

The UK's vast marine energy resource is mostly located in remote areas west and north of Scotland, and transmission of this energy to the mainland will be required. This may be achieved by using this ‘stranded’ power to generate hydrogen electrolytically, which may in turn be stored or transported using sponge iron technology. This paper reviews the technology and research needed to bring such a process on stream. We propose utilising techniques that have been developed for the oxygen carriers used in chemical looping, and also those used in early processes for hydrogen generation in the chemical industry. We briefly outline the design requirements for an energy efficient sponge iron plant. It is shown that the iron sponge system presents better energy efficiencies than alternative forms of bulk storage such as liquid hydrogen, magnesium hydride slurry, some at least of the metal hydrides, or methylcyclohexane–toluene–hydrogen, provided that requirements can be met for particle durability and reactivity.     

基于SOA的智能航运数据服务平台研究

为了实现全国范围的内河航运数据共享,提高我国内河航运的管理水平,需要一种稳定可靠、松耦合的数据共享方式。针对当前的内河航运数据共享需求,并根据当前我国各省的内河航运信息化建设的实际情况,参考国内外成熟的理论基础,提出了基于SOA的数据共享体系,从而实现多节点的关键数据实时共享的应用场景。通过这种方式可以实现内河航运数据共享服务,满足航运信息服务的要求,并适应今后不断增长的共享节点及共享压力。     

清代大运河之帆船航运

自中国封建王朝定都北京以来,连接北京和杭州的大运河一直作为水上要道发挥着重要作用。特别是在明清两代,大运河作为最重要的漕运通路,承担了江南税粮输送的任务。可以说,从某种意义上看,大运河与北京政权的命运息息相关。但到目前为止,这些承担输送任务的漕船到底如何在大运河上航行的问题,仍然不甚清晰。因此,以清代的档案史料为中心,来分析运河漕船的航行情况。     

焊接过程微机控制系统中线性隔离电路的研究

本文以MOC5010为基础元件,根据焊接过程微机控制系统的特点,设计了用于电流电压检测及数字控制回路中的线性光电耦合电路,实验结果及实际应用证明:该电路良好地达到了预期的目的。     

上海船舶工业展望与船舶焊接应用

船舶焊接技术在船舶制造中占有重要的地位,是一项技术性、专业性很强的系统工程.先进的造船高效焊接技术,在提高船舶的建造效率、降低船舶建造成本、提高船舶建造质量上发挥重要作用,也是企业提高经济效益的有效途径.     

大型球磨机衬板材料的研究和应用

研究成功了一种适合于制造大型球磨机衬板的新材料.在不含钼、镍等贵重合金元素前提下,设计的中碳钢以硅、锰、铬为主要合金元素,并加入少量钛、钙、硼、钇、钾、钠等元素,改善钢的组织和淬透性.新材料具有足够的淬透性和淬硬性,经油冷淬火和中温回火处理后,硬度大于55 HRC,冲击韧性大于25 J/cm2,断裂韧性大于40 MPa·m1/2.用于制造大型球磨机衬板,耐磨性比高锰钢衬板提高1倍以上,生产成本降低15%,具有很好的经济效益.     

以临界屈曲应变为判断依据的非开挖内衬修复设计改进方法

《城镇排水管道非开挖修复更新工程技术规程》(CJJ/T 210-2014)选取管道的长期弹性模量EL进行内衬修复设计,并规定EL为短期弹性模量Es的0.5倍,但是对于这一做法的理论依据仍然存在较多质疑,也导致设计过于保守。据此考虑引入临界屈曲应变理论,提出以内衬的临界屈曲应变εr为破坏判据,并选取管道短期弹性模量Es进行设计的改进方法。研究表明,改进后的设计方法能够保证内衬设计在理论上的正确性,满足内衬的长期强度要求,减小大约21%的内衬设计壁厚,能够有效降低工程成本。