Optimization design of deep lean-ore mining and safety evaluation

In order to settle the mining optimization design and safety problem of the above 1 150 m pillar of No.1 ore-body in No.H Mining Jinchuan, the lean-ore above 1 250 m, the 1 150 m horizontal pillar and the ore-body below 1 100 m regarded as research objects based on the original design project, and nine calculation schemes on different mining sequence and different fill body strength were put forward based on cement-sand ratio of 1 ： 4, 1： 12 and 1 ： 24. Calculation parameters were got by the back analysis method of field monitoring data, and the FLAC2D program was applied to compute for these schemes, stress and displacement of ground settlement, shaft and stope roof were analyzed, and some conclusions were got. Results show that the intensity of filling body and the mining technique have very important effect on controlling settlement and stability of surrounding rock; Developing of lean ore have some influences to the 16th return air filling shaft, especially for 1 500--1 400 m of the shaft; The best project is the first project. This research supply some technique references and safety appraisals for the mining of lean-ore of No.II Mining Jinchuan.

BP＇ s Performance Management System Optimization Design

Performance management as the core part of modem human resources management, is to ensure that the employee＇s work and the organization＇s strategic objectives to maintain consistent process. Performance management by setting a scientific and rational organizational goals, departmental goals and individual goals for employees specified in the direction Managers to discover the work of subordinates through performance coaching communication problems exist, to provide guidance and resources to support the necessary work to subordinates, subordinates bv improving, work attitude and workin~ melhnd~ tn en^Hre~ tho renl^v~fltan nfn^r~＂ I-,;~.~;

Multidisciplinary Design Optimization of Vehicle Instrument Panel Based on Multi-objective Genetic Algorithm

Typical multidisciplinary design optimization（MDO） has gradually been proposed to balance performances of lightweight, noise, vibration and harshness（NVH） and safety for instrument panel（IP） structure in the automotive development. Nevertheless, plastic constitutive relation of Polypropylene（PP） under different strain rates, has not been taken into consideration in current reliability-based and collaborative IP MDO design. In this paper, based on tensile test under different strain rates, the constitutive relation of Polypropylene material is studied. Impact simulation tests for head and knee bolster are carried out to meet the regulation of FMVSS 201 and FMVSS 208, respectively. NVH analysis is performed to obtain mainly the natural frequencies and corresponding mode shapes, while the crashworthiness analysis is employed to examine the crash behavior of IP structure. With the consideration of lightweight, NVH, head and knee bolster impact performance, design of experiment（DOE）, response surface model（RSM）, and collaborative optimization（CO） are applied to realize the determined and reliability-based optimizations, respectively. Furthermore, based on multi-objective genetic algorithm（MOGA）, the optimal Pareto sets are completed to solve the multi-objective optimization（MOO） problem. The proposed research ensures the smoothness of Pareto set, enhances the ability of engineers to make a comprehensive decision about multi-objectives and choose the optimal design, and improves the quality and efficiency of MDO.

Optimal Design of Stewart Platform Safety Mechanism

A safety mechanism capable of moving at will within the range of its whole link lengths is designed based on the link space. Sixteen extreme poses are obtained in a Stewart platform. The singular points of the extreme poses are solved by using homotopy method as well as the judgment condition of singular points, and thereby the maximum link lengths are achieved. The rotation angles of joints and the distances between two neighboring links are analyzed in a calculation example in which that the mechanism moves among the extreme poses is assumed. Then an algorithm to test the safety mechanism is presented taking the constraint conditions into account. A safety mechanism having optimal properties of global movement is worked out by optimizing all structural parameters through minimizing the average condition number of extreme poses.

Impact of Improving Design Factor over 0.72 on the Safety and Reliability of Gas Pipelines and Feasibility Justification

Many years experience of the operation of high stress (>72% specified minimum yield strength, SMYS) gas pipelines and statistical analysis results of pipeline incidents showed that the operating pipelines at stress levels over 72% SMYS have not presented problems in USA and Canada, and design factor does not control incidents or the safety of pipelines. Enhancing pipeline safety management level is most important for decreasing incident rate. The application history of higher design factors in the U.S and Canada was reviewed. And the effect of higher factors to the critical flaw size, puncture resistance, change of reliability with time, risk level and the arrest toughness requirements of pipeline were analyzed here. The comparison of pipeline failure rates and risk levels between two design factors (0.72 and 0.8) has shown that a change in design factor from 0.72 to 0.8 would bring little effect on failure rates and risk levels. On the basis of the analysis result, the application feasibility of design factor of 0.8 in China was discussed and the related suggestions were proposed. When an operator wishes to apply design factor 0.8 to gas pipeline, the following process is recommended: stress level of line pipe hydro test should be up to 100% SMYS, reliability and risk assessment at the design feasibility or conceptual stage should be conducted, Charpy impact energy should meet the need of pipeline crack arrest; and establish and execute risk based integrity management plan. The technology of pipeline steel metallurgy, line pipe fabrication and pipeline construction, and line pipe quality control level in China achieved tremendous progresses, and line pipe product standards and property indexes have come up to international advanced level. Furthermore, pipeline safety management has improved greatly in China. Consequently, the research for the feasibility of application of design factor of 0.8 in China has fundamental basis.

Highway Planning and Design in the Qinghai–Tibet Plateau of China: A Cost–Safety Balance Perspective

Engineering designs for mountainous highways emphasize compliance checking to ensure safety. However, relying solely on compliance checking may lead designers to minimize costs at the expense of high risk indicators, since the overall risk level of the highway design is unknown to the designers. This paper describes a method for the simultaneous consideration of traffic safety risks and the associated cost burden related to the appropriate planning and design of a mountainous highway. The method can be carried out in four steps: First, the highway design is represented by a new parametric framework to extract the key design variables that affect not only the life-cycle cost but also the operational safety. Second, the relationship between the life-cycle cost and the operational safety risk factors is established in the cost-estimation functions. Third, a fault tree analysis (FTA) is introduced to identify the traffic risk factors from the design variables. The safety performance of the design solutions is also assessed by the generalized linear-regression model. Fourth, a theory of acceptable risk analysis is introduced to the traffic safety assessment, and a computing algorithm is proposed to solve for a cost-efficient optimal solution within the range of acceptable risk, in order to help decision-makers. This approach was applied and examined in the Sichuan–Tibet Highway engineering project, which is located in a complex area with a large elevation gradient and a wide range of mountains. The experimental results show that the proposed approach significantly improved both the safety and cost performance of the project in the study area.

Research on Highway Traffic Safety and Facility Optimization

Traffic safety is one of the problems that need to be addressed in the construction and development of expressway.The key content of the design of traffic safety facilities is optimizing traffic safety facilities to reduce the probability of traffic safety accidents.Based on the analysis of highway safety facilities design optimization requirements,this paper puts forward the corresponding optimization measures,and explores the innovation of safety facilities design,in hopes of providing reference for the design of highway safety facilities.

The Human-Machine Safety Design of Mechanical Toys for Children

In order to ensure the safety of children while using machineries and avoid harm caused by mechanical toys,this paper analyzes the types and detection standards of children’s toys,discusses the reasons for the harm caused by these toys,and proposes human-machine safety design strategies for children’s toys as reference.

食品安全检验实验室管理及质量控制的强化措施探究

食品安全检验实验室的主要工作是对食品进行检验,依据食品检验数据对食品安全水平进行精准判定。食品安全实验室管理和质量控制对最终检测结果有直接影响,因此需要确保食品安全检验实验室的管理有效性和检验质量的合理控制。基于此,本文针对食品安全检验实验室管理和质量控制的相关措施进行探究,以期强化实验室管理质量和食品安全检测质量,为食品安全提供可靠保障和支持。

基于重大交通工程的《工程项目管理》课程思政体系设计与优化

作为一门融合工程技术与管理科学的综合类课程,《工程项目管理》具有较强的学科交叉融合特性,并且在各类重大国计民生项目中效果显著。文章以重大交通工程项目为切入点,通过交通强国、工匠精神、专业伦理、学术修养等课程思政元素的“触点”和“融点”,从教学目标、发展历程、课程前沿、课程实践等角度进行《工程项目管理》的课程设计,并在教学实践中探索场景融入、角色转换等沉浸式思政教育,以“润物细无声”的方式潜移默化传递学生崇高的价值观和使命感、积极主动发现问题的学习态度,以及不断探索学习与创新的精神,并通过典型的教学样例设计,对其效果进行评价,取得了满意的效果。

化工企业设备设施变更管理信息化实践

信息化工具的深入应用,可显著提升化工企业内部资源利用效率,推动管理活动走向科学化、规范化和标准化。信息化不仅增强了信息的可追溯性,优化管理绩效,还能显著降低了安全事故风险。设备设施变更管理是确保化工企业安全、稳定、长期、优质运行的关键因素之一,然而,因变更而引发的安全事故屡见不鲜,应引起高度重视。通过分析传统设备设施变更管理中存在的问题,如信息更新滞后、管理流程旁通、变更后人员培训不足等,并结合其他设备信息化管理管理功能的联动需求,提出了设备设施变更管理信息化需求,优化了管理流程。经过信息化实践验证,可显著提高设备设施变更管理的准确性、效率,降低因变更而产生的风险。

畜产品加工中的常见问题及解决对策

畜产品加工在保障食品安全和提升产品质量方面面临诸多挑战。本文通过分析畜产品在加工过程中存在的原料质量控制不足、加工工艺参数优化不当及卫生安全管理体系缺陷等常见问题,提出相应的解决措施,旨在提高畜产品加工的整体水平,确保食品安全,促进行业的可持续发展。

提升代建制模式下工程设计管理效能的方法探讨

代建制模式下的工程项目具有参建单位多、各方工作界面划分模糊、沟通协调程序复杂等特点,针对代建制工程的特点优化工程设计管理程序,对于保障项目设计质量、提高项目整体效益等方面具有重大意义。论文系统介绍了代建制模式下的工程设计管理程序,分析了这一程序的重要意义,并深入探讨了影响工程设计管理效能的主要制约因素。针对现有的挑战,论文提出了一系列优化措施,包括引导业主决策、建立有效沟通机制、优化设计资源以及强化管理团队建设,旨在提高工程设计管理的整体效能。

基于模糊逻辑的飞机电推进系统能量管理策略研究

为了提升飞机电推进动力系统的关键性能,需要设计和优化内部能量管理控制策略并实现功率合理分配。本文基于MATLAB/Simulink平台,建立了电推进动力系统仿真模型,并在能量管理系统模块中提出了基于模糊逻辑的能量管理策略(EMS),其用于动力系统内部的功率分配和控制。针对从滑跑直到巡航稳定点的飞行任务段,对电推进动力系统进行了时段级仿真实验,研究了氢气消耗量等量化指标的表现。在此基础之上,基于遗传算法的优化方法,对模糊控制系统的隶属度函数参数进行了寻优。计算结果表明,在本文基于模糊逻辑的EMS作用下电推进动力系统的氢气消耗量减少9.27%,而且氢燃料电池功率波动剧烈程度减少25.11%;优化后,主指标氢气消耗量进一步减少6.5%,同时次要指标的变化被约束。

水轮型翅片组耦合均温板的多目标及拓扑优化

为解决传统通道型液冷板功耗高、散热效率低等问题,提出了用于电动车的一种异形化的水轮形扰流翅片组耦合均温板电池热管理系统。水轮组的组合方式、布置位置和数量等因素确定基础模型后,使用多目标优化方法,分析了翅片长度、翅片倾角、中心距离出口边距离和两出口间距离。为了进一步提升液冷板均温性,在液冷板外侧添加均温板,以温度为目标函数对其进行拓扑优化。结果表明:与初始模型相比平均温度和标准差分别降低了1.83℃和0.45,综合评价指标—热性能因子(TPF)提升77.8%。翅片长度、倾角、出口位置及其附件扰流对液冷板各项性能有着显著影响。在流体通道所占体积分数为0.8时,液冷板的平均温度进一步下降2.6℃,温度标准差下降0.206,TPF相较添加前继续提升18.9%。

FLNG船舶能量管理系统设计与性能优化

浮式液化天然气生产储卸装置(floating liquefied natural gas system,FLNG)特种液货船作为开发海上天然气田的新式装置,极大的方便了对处于深海的气田的开发利用,该文以“Prelude”号FLNG作为母船,提出一种新型FLNG低温能量管理系统。该系统主要利用液态空气作为媒介储存和释放能量,通过液态空气冷能与混合制冷循环相结合实现天然气液化过程,在提高LNG生产性能的同时集成了CO_(2)液化循环和电力的生产,通过CO_(2)液化和剩余冷能发电提高系统的输出性能,实现了FLNG船舶冷能的多级利用,也为FLNG船舶冷能利用提供新方法,新途径。所提系统相较于基准模型具有更好的性能,在7.04年可实现成本回收。最后采用多目标性能优化,进一步提高系统㶲效率达60.67%,同时降低约2.3%的成本。该FLNG低温能量管理系统有高效、低耗、稳收益、低碳化等特点,可更好优化海上LNG供应链,促进航运业“双碳”发展。

仿真建模工具内存分配优化

在一体化仿真建模工具的性能优化时,内存分配优化方面提出内存池式分配方式,该分配方式特采用全局内存池基础实现并加上并行线程内存管理的方法来较好地匹配仿真工具的系统多临时对象和多动态分配内存的应用特点,性能测试表明,该内存池具有良好的空间特性和效率,比传统的操作系统直接分配内存节省约50.7%的分配时间。

住院患者管道护理系列工具的改良及效果评价

目的改良住院患者管道护理系列工具并评价其应用效果。方法改良住院患者管道护理系列工具,包括改进约束工具、改进早期活动与院内转运影像检查使用器材、优化管道固定、规范管道标识4个方面。采用便利抽样法,选取2019年1月—2022年12月在福建省南平市某三级甲等医院治疗的住院患者作为研究对象,按住院时间先后分为试验组(2022年1月—12月)8977例、对照组(2019年1月—12月)7094例。试验组采用改良后的住院患者管道护理系列工具,对照组采用改良前的住院患者管道护理系列工具,比较两组非计划性拔管发生率的差异。结果试验组非计划性拔管总体发生率低于对照组,差异具有统计学意义(χ^(2)=13.946,P<0.05);常见4类导管中的中心静脉导管及气管导管发生率低于对照组(χ^(2)=4.545、15.623,均P<0.05)。结论改良后的住院患者管道护理系列工具有助于降低住院患者非计划性拔管发生率,提高留置管道的安全性。

变电站运维策略优化及安全管控系统设计与实现

近年来,为最大限度地提升变电站运维的全面性、有效性和成本性,业内开展大量的研究工作。在变电站运维中,科学且完善的安全管控系统是关键组成部分。该文首先对变电站运维策略优化进行阐述;其次提出一种符合变电站运维策略优化所需的安全管控系统的设计;最后基于所构想的系统设计,阐述安全管控系统的实现。所作研究为业内人员的研究和实践,提供一定的参考和借鉴。

食品安全标准在食品安全管理实践中的应用探讨

确保食品安全是维护人们健康与生命安全的关键议题,而实施食品安全标准则是其中一个关键保障措施。这些标准对于食品安全管理至关重要,有效运用这些标准是提高食品安全管理效能与品质的基石。文章将着重探讨食品安全标准在实际食品安全管理中的应用,分析如何优化这些标准的作用,以确保公众的饮食安全。