Gas dynamic control of properties of welded joints from high strength alloyed steels

Gas dynamic control in welding with consumable electrode in conditions of two-jet gas shielding and its impact on the processes in the welding area and properties of the welded joints from high strength alloyed steel 30HGSA is considered in the paper. The results of a comparative experimental study of controlling the properties of welded joints by changing the gas dynamics of the active shielding gas are given. The impact force of a shielding gas jet on the drop of the electrode metal is 12 times higher in conditions of two-jet gas shielding than in those of single jet shielding. It is found that gas dynamics of the active shielding gas jet determines the formation of the welded joints, their chemical properties and the properties of the welded joints from high strength alloyed steels. The consumable electrode welding method with two-jet gas shielding provides controlled dynamics in the welding area and allows controlling the transfer of the electrode metal, chemical composition of the weld, stabilizing the welding process, it ensures higher mechanical properties of the welded joints.     

房地产建设项目施工过程中的风险管理

房地产企业面对激烈的市场竞争和国家宏观政策的打压,面对开发成本的逐年上升;加之房地产项目开发周期长,投资额度大,管理及组织协调复杂等,所以推行项目管理是其生存与发展及管理创新,实现房地产企业的健康、可持续发展,以应付复杂多变环境,确保项目目标实现的有力武器。     

浅谈房地产企业的成本管理

本文结合房地产开发企业成本管理和项目管理的工作实践,就房地产开发的成本管理问题进行了探讨。     

建设项目全面造价管理实施的内容与保障措施研究

工程项目全面造价管理是一项具有复杂性、系统性的管理工作,在工程项目建设过程中,必须树立成本意识,及时了解和分析工程项目建设中的各种信息,减少不必要的支出,控制工程项目的造价。实施全面造价管理必须重视全过程造价管理、全要素造价管理、全团队造价管理之间的融合与协调,强化造价管理意识、改进计价方法、加强员工培训、提高信息化管理水平,以促进全面造价管理的实施,最大限度地提高工程项目建设的投资效益。     

Dynamic control approaches of spectrum sensing in multi-band cognitive radio networks

In this paper,the dynamic control approaches for spectrum sensing are proposed,based on the theory that prediction is synonymous with data compression in computational learning. Firstly,a spectrum sensing sequence prediction scheme is proposed to reduce the spectrum sensing time and improve the throughput of secondary users. We use Ziv-Lempel data compression algorithm to design the prediction scheme,where spectrum band usage history is utilized. In addition,an iterative algorithm to find out the optimal number of spectrum bands allowed to sense is proposed,with the aim of maximizing the expected net reward of each secondary user in each time slot. Finally,extensive simulation results are shown to demonstrate the effectiveness of the proposed dynamic control approaches of spectrum sensing.     

高速公路工程施工成本造价有效控制与管理措施分析探讨

本文结合笔者在施工单位多年从事高速公路工程造价工作实践，详细分析了目前施工单位在高速公路工程造价控制与管理中存在的主要问题，针对性地提出了加强工程成本造价有效控制与管理的具体措施。     

在识别、评价、控制HSE因素中需要注意的10个问题

从10个方面分析了在HSE因素识别、评价和控制中存在的问题,并提出了相应的改进意见。     

RQD系列大型精密控制井式渗碳炉

大型精密控制井式渗碳炉设计制造的要求、工艺过程在线动态控制、炉内结构件的热变形问题、设备的安全可靠运行等,针对上述内容我们进行了慎密的开发和研制,通过试验和实际生产取得很好的试验结果和经济效益.     

烟气分析自动化炼钢系统

马钢120t转炉采用烟气分析动态控制模型实现自动化炼钢。该系统利用质谱这种精确快速的气体分析技术,通过先进的数学模型对转炉炼钢进行控制。该系统的成功应用对国内中小型顶底复吹转炉实行自动化炼钢改造具有普遍的意义。