The Optimization Study about Fault Self-Healing Restoration of Power Distribution Network Based on Multi-Agent Technology

In order to quickly and accurately locate the fault location of the distribution network and increase the stability of the distribution network,a fault recovery method based on multi-objective optimization algorithm is proposed.The optimization of the power distribution network fault system based on multiagent technology realizes fast recovery of multi-objective fault,solve the problem of network learning and parameter adjustment in the later stage of particle swarm optimization algorithm falling into the local extreme value dilemma,and realize the multi-dimensional nonlinear optimization of the main grid and the auxiliary grid.The system proposed in this study takes power distribution network as the goal,applies fuzzy probability algorithm,simplifies the calculation process,avoids local extreme value,and finally realizes the energy balance between each power grid.Simulation results show that the Multi-Agent Technology enjoys priority in restoring important load,shortening the recovery time of power grid balance,and reducing the overall line loss rate of power grid.Therefore,the power grid fault self-healing system can improve the safety and stability of the important power grid,and reduce the economic loss rate of the whole power grid.

Systematic review of mixing technology for recycling waste tailings as cemented paste backfill in mines in China

The development of industry is inseparable from the support of mining.However,mining processes consume a large amount of energy,and increased tailing emissions can have a significant impact on the environment.In the past few decades,the mining industry developed many technologies that are related to mineral energy management,of which cemented paste backfill(CPB)is one of the representative technologies.CPB has been successfully applied to mine ground control and tailings management.In CPB technology,the mixing process is the key to achieving materials with good final quality and controlled properties.However,in the preparation process,the mixed homogeneity of the CPB is difficult to achieve because of fine tailings,high solid volume fraction,and high viscosity.Most research focused on the effect of mixing ingredients on CPB properties rather than on the preparation process of the CPB.Therefore,improving the performance and reducing the production cost of CPB by optimizing the mixing process are important.This review summarizes the current studies on the mixing technology of CPB and its application status in China.Then,it compares the advantages and disadvantages of multiple mixing equipment and discusses the latest results and research hotspots in paste preparation.Finally,it concludes the challenges and development trends of mixing technology on the basis of the relevant application cases in China to promoting cement-based material mixing technology development.

Diffusion and adoption of environmentally sound technology in China cement industry

From rapid growth of cement industry in China there is serious pollution of powdered dust. After general analysis on factors influencing adoption of environmentally sound technology(EST) as well as economic benefit from adoption of dust removing technology and capital ability of cement firms to invest, the conclusion that the obstacles to EST in China cement sector are different from ones in other sectors was drawn. And then, hindrances to diffusion and adoption of EST in China cement were discussion by empirical study.

A Cementing Technology for Shale Oil Horizontal Wells

Organic rich dark shale of Q Formation can be found in many areas(e.g.,in the North of S Basin).The shale target stratum is easy to hydrate and often undergoes spallation.Therefore,centering the casing in the horizontal section of the irregular borehole is relatively difficult.Similarly,achieving a good cementflushing efficiency under complex borehole conditions is a complex task.Through technologies such as centralizer,efficient preflushing,multi-stageflushing and ductile cement slurry,better performances can be achieved.In this study,it is shown that the cementing rate in the DY2H horizontal section is 97.8%,which is more than 34%higher than that of adjacent wells.This cementing matching technology for sidetracking horizontal wells can be used to improve the cementing quality of continental shale and provides a reference for future applications in thisfield.

Support technology for mine roadways in extreme weakly cemented strata and its application

For the engineering geology conditions of bad mine roadway roof and floor lithology in extremely weak cemented strata, the best section shape of the roadway is determined from the study of tunnel surrounding rock displacement, plastic zone and stress distribution in rectangular, circle arch and arch wall sections, respectively. Based on the mining depth and thickness of the coal seam, roadway support technology solutions with different buried depth and thickness of coal seam are proposed. Support schemes are amended and optimized in time through monitoring data of the deformation of roadway, roof separation, l-beam bracket, bolt and anchor cable force to ensure the long-term stability and security of the roadway surrounding rock and support structure. The monitoring results show that mine roadway support schemes for different buried depth and section can be adapted to the characteristics of ground pressure and deformation of the surrounding rock in different depth well, effectively control the roadway surrounding rock deformation and the floor heave and guarantee the safety of construction and basic stability of surrounding rock and support structure.

Multifunctional, Sustainable, and Biological Non-Ureolytic Self-Healing Systems for Cement-Based Materials

Microbially induced calcium carbonate(CaCO_(3))precipitation(MICP)has been investigated as a sustain-able alternative to conventional concrete remediation methods for improving the mechanical properties and durability of concrete structures.To date,urea-dependent MICP is the most widely employed MICP pathway in biological self-healing concrete research as its use has resulted in efficient CaCO_(3) precipita-tion rates.NH_(3) is a byproduct of ureolysis,and can be hazardous to cementitious structures and the health of various species.Accordingly,non-ureolytic bacterial concrete self-healing systems have been developed as eco-friendly alternatives to urea-dependent self-healing systems.Non-ureolytic pathways can improve the physical properties of concrete samples and incorporate the use of waste materials;they have the potential to be cost-effective and sustainable.Moreover,they can be applied in terrestrial and marine environments.To date,research on non-ureolytic concrete self-healing systems has been scarce compared to that on ureolytic systems.This article discusses the advances and challenges in non-ureolytic bacterial concrete self-healing studies and highlights the directions for future research.

Mechanism and Preventive Technology of the Thaumasite Form of Sulfate Attack on Cement Mortars

The deterioration mechanism of thaumasite towards cement or concrete structure and the deterioration pattern of in-situ construction caused by the formation of thaumasite were studied in this paper. To improve the TSA (the thaumasite form of sulfate attack) resistance, the cement type, water to cement ratios, the mineral admixture and the circumstance factors should be taken into consideration.

Comparison of Temperature Field Distribution between Cement Preclinkering Technology and Cement Precalcining Technology

Through the comparison of calcination conditions between cement preclinkering technology and cement precalcining technology,we studied the characteristics of temperature field distribution of cement preclinkering technology systems including cyclone preheater,preclinkering furnace,and rotary kiln.We used numericalsimulation method to obtain data of temperature field distribution.Some results are found by system study.The ratio of tailcoalof cement preclinkering technology is about 70%,and raw mealtemperature can reach 1070 ℃.Shorter L/D kiln type of preclinkering technology can obtain more stable calcining zone temperature.The highest solid temperature of cement preclinkering technology is higher than 80 ℃,and high temperature region（〉1450 ℃）length is 2 times,which is beneficialfor calcining clinker and higher clinker quality.So cement preclinkering technology can obtain more performance temperature filed,which improves both the solid-phase reaction and liquid-phase reaction.

Study on Hardening and Reuse Technology of Drilling Waste

In order to meet the increasingly strict environmental requirements and achieve the comprehensive utilization of waste in drilling operation,three techniques were used to harden the drilling waste.The three techniques are cement hardening technology,fly ash hardening technology and quicklime-sodium silicate hardening technology.Orthogonal analysis was used to evaluate and optimize the experimental results from the three techniques.The results show that the hardening system of quicklime-sodium silicate is not satisfying,and the compressive strength of hardened body is only 1.32 MPa.The optimal mass ratio in cement hardening system is drilling waste∶water∶YHJ1∶YHJ2∶YHJ3∶cement = 10∶4∶3.2∶2.2∶0.5∶4.The optimal mass ratio in fly ash hardening system is drilling waste∶water∶YHJ1∶YHJ2∶YHJ3∶fly ash = 10∶4∶3.2∶1.8∶1.5∶2.The compressive strength reaches 3.19 and 2.95 MPa respectively.Based on this strength,the hardened body can be used as low-strength building bricks,subgrade or nutrition bowls in arid regions to achieve the reuse of drilling waste.

The Application and Prospect of Stabilization/Solidification Technology for Hazardous Waste in China

The number of hazardous waste in our country increased dramatically in recent years,stabilization/solidification technology begins to attract a wide spread attention by domestic scholars.Based on the domestic related literature,this paper discussed the present situation about the treatment of the solid waste using stabilization/solidification technology;meanwhile we have a variety of outlooks on the future of the stabilization/solidification technology.

The Application and Prospect of Stabilization/Solidification Technology for Hazardous Waste in China

The number of hazardous waste in our country increased dramatically in recent years,stabilization/solidification technology begins to attract a wide spread attention by domestic scholars.Based on the domestic related literature,this paper discussed the present situation about the treatment of the solid waste using stabilization/solidification technology;meanwhile we have a variety of outlooks on the future of the stabilization/solidification technology.

纳米或超细WC-Co粉体制备过程强化研究进展

【目的】总结纳米或超细碳化钨钴(WC-Co)粉体制备过程的研究,解决WC-Co做为热喷涂原料对机械零件的磨损和腐蚀的影响。【研究现状】总结纳米或超细WC-Co制备过程强化、反应路径,以及Co对还原碳化过程的作用等;其中机械作用力强化包括球磨强度的影响、氧化钨原料的影响、反应温度的影响,原子或分子水平强化包括气相化学合成、喷雾转化,气相碳质强化反应过程包括烃类物质、一氧化碳;纳米或超细WC-Co制备过程反应路径包括还原过程、碳化过程;对还原碳化过程的作用包括Co对氧化钨还原碳化过程具有催化作用、Co影响WC-Co产物粒径、Co含量增加降低碳化温度、Co促进气态碳源析碳等。【结论与展望】提出WC-Co粉体制备反应路径方面,应深入揭示制备反应路径,应进一步分析缺碳相η物相在制备过程中的作用,对W、Co、C扩散的影响机制;认为模拟分析反应过程中还原碳化气与固体原料之间的热量、质量传递过程,可为制备过程进一步优化调控和反应器放大设计奠定理论基础;同时WC-Co粉体热喷涂性能方面,用于机械件的喷涂处理时,应测试涂层的抗磨损和腐蚀性能,反馈调控优化和制备过程。

伊犁四矿弱胶结软岩巷道围岩控制技术研究及应用

以新疆伊犁四矿21113工作面为工程背景,通过理论分析、数值模拟以及现场实测等手段,围绕浅埋弱胶结软岩巷道破坏特征及控制技术展开了一系列研究,研究结果表明:伊犁四矿弱胶结软岩巷道围岩变形特点为自稳时间短、应力释放明显,泥岩遇水易软化、出现无征兆冒顶,岩体自重大、顶板出现下沉,支护结构受力不耦合、支护单元破坏等。根据围岩变形特点提出了对巷道围岩及时支护、喷浆封闭、拱形断面、加长支护的联合支护技术,经过现场工业性试验以及观测数据证明,该联合支护方案,能够很好地控制巷道变形,21113上顺槽巷道从开始回采到结束未出现瞬发变形、顶板切落、锚杆(索)断裂及钢带撕裂等情况,巷道变形及维护满足工作面顺槽的使用要求。可为伊犁矿区弱胶结软岩巷道支护设计和施工提供指导作用。

陈旧性骨质疏松性椎体压缩骨折骨不连的修复策略:一项病例分析

背景:腰椎骨质疏松性压缩性骨折患者的脊柱和骨盆矢状位参数存在不同程度改变,将导致全脊柱/腰椎矢状面发生失平衡和再平衡。如果初次骨质疏松性椎体压缩骨折没有得到及时治疗,随着时间的推移将发展为陈旧性骨质疏松性椎体压缩骨折骨不连。目的:观察陈旧性骨质疏松性腰椎体压缩骨折骨不连9例患者行经皮椎体成形(PVP)术后的修复效果。方法:回顾性分析2018年9月至2022年8月上海市公共卫生临床中心骨科收治的陈旧性老年骨质疏松性腰椎椎体压缩性骨折骨不连经皮椎体成形术后术椎再骨折患者9例的临床资料,所有患者均采用经皮椎体成形行再翻修治疗,同时规律进行抗骨质疏松治疗和康复训练。出院前及随访时复查患者的腰椎X射线平片及三维CT检测结果,评价骨水泥弥散情况,记录患者术前、术后、随访时的目测类比评分、腰椎Oswetry功能障碍指数(ODI评分)及Roussouly腰椎功能分型变化。结果与结论:①9例患者术后随访时均未发生神经损伤、感染、骨水泥椎管内渗漏、肺栓塞及过敏性休克等严重手术并发症,均未发生骨水泥相关的不良反应。有1例患者术后2年感染COVID-19致呼吸功能衰竭死亡。②术椎再骨折患者术后疼痛目测类比评分和ODI评分均显著低于翻修术前,末次随访经皮椎体成形翻修术后患者Roussouly腰椎功能分型显著改善;末次随访测量术椎椎体高度变化与术前比较无显著性意义。③上述结果提示,对陈旧性骨质疏松性腰椎体压缩骨折骨不连行经皮椎体成形治疗的患者而言,适量骨水泥注入和有效骨水泥弥散具有明显缓解术后疼痛作用,规律抗骨质疏松和术后有效康复训练有助于患者术后腰椎功能恢复。

Modification of waste fluorgypsum and its applications as a cement retarder

The waste fiuorgypsum was modified and applied as a cement retarder. The main chemical composition and mineral structure of the waste fluorgypsum were analyzed. Scanning electron microscopy （SEM） and eight-channel micro-calorimeter （TAM Air） were employed to analyze the changes in morphology and study the application performance of the modified fluorgypsum, respectively. Experimental results indicate that the flexural strength and compressive strength of the modified fiuorgypsurn are roughly equal to those of the natural gypsum. The morphology of the crystal of the fiuorgypsum changes from block particle into trimetric short column. The fluorgypsum crystals stagger mutually and improve the strength of the hardened body. The modified fluorgypsum as cement retarder could delay the hydration, reduce the heat of the hydration and make the setting time, volume stability, and the S03 content of the cement meet the national standards. The modified fluorgypsum is a good substitute for the natural gypsum.

膏体充填:金属矿绿色开采的变革性技术

膏体充填具有安全、环保、经济、高效的显著优势,是近年来金属矿绿色开采的重要变革性技术。本文对近40年来中国膏体充填的发展历程、主要科技成就、基础理论与关键技术装备进行了分析与总结,并重点阐述了膏体充填对采矿工艺变革的推动作用。最后,提出了无人化膏体充填、基于膏体充填的全废综合利用这两大重要发展趋势。

混合现实技术在椎体成形治疗中的应用

背景:如何提高椎体成形术中穿刺的精准性、减少手术损伤、提高手术效率是目前椎体成形治疗技术探索和改进的焦点之一。目的:探讨混合现实临床设计方案在脊柱骨折经皮椎体成形过程中应用的临床意义。方法:选择2023年6月大连市第二人民医院收治的2例脊柱骨质疏松性腰椎椎体压缩骨折患者,患者术前行腰椎128排CT扫描并获得医学数字成像和通信原始数据,Visual Volume软件构建脊柱压缩性骨折三维网络模型。运用全息影像眼镜将三维网络模型影像精确映射于真实世界,协助术者完成术前模拟、术前病情及治疗方案阐述,以及术中引导穿刺及骨水泥注射。结果与结论:①在混合现实临床设计方案辅助下可实现经皮椎体成形治疗的精准穿刺,术后影像学检查示骨水泥充填良好、无明显渗漏,术后患者症状缓解良好,术后当天即可下地活动;②提示混合现实临床设计方案有助于术者术前进行完善的手术设计、提高与患者及家属的沟通效率;术中协助精准穿刺、缩短手术时间、减少副损伤,是一种新的有效的临床诊疗模式,在脊柱外科微创化、精准化、个性化的治疗中具有发展潜力。

Anti-hydration Magnesia-spinel Bricks in Cement Industry

Hydration cracks of magnesia-spinel bricks in cement industry have been serious problems for both refractory producers and refractory users for a long time.When magnesia-spinel bricks are kept for more than 6months,the bricks tend to have reaction with water or moisture and result in cracks and loss on their structural strength. Those bricks cannot be used anymore and cause substantial loss for the related parties. In 2013,the Siam Refractory Industry Co.,Ltd.,Thailand,successfully developed and applied a special nano-technology to create ＂Anti-Hydration Magnesia-Spinel Bricks ＂ for cement industry which can have the storage time more than two years even in high humidity areas. The cement producers can ensure that all bricks still have good properties as the new ones.

硬质合金材料加工研究进展

硬质合金材料具有硬度高、强度高、化学稳定性强、冲击韧性高以及耐磨性好等优异材料特性,是现代工业生产以及新技术开发等领域中具有良好发展前景的工具材料和结构材料。但硬质合金材料的高脆性、低断裂韧性等缺陷使得硬质合金的机械加工性能非常差,成为其发展的重大阻碍,并且硬质合金加工表面易产生裂纹和凹坑,使工件表面质量下降并且影响加工性能,是典型难加工材料。本文对硬质合金的分类、性能及切削加工特点进行分析,并对硬质合金材料的加工研究现状和各种加工工艺方法的优缺点、发展趋势、存在问题及其对硬质合金表面质量的影响进行研究总结,以期为精密高效加工硬质合金提供参考依据。

硬质合金六面顶顶锤研究进展

顶锤是超高压装置的关键部件和主要耗材,硬质合金材质以其高抗压、高刚度及优良的导热、导电性能成为顶锤的最佳材质。压机和合成腔体持续大型化,对顶锤质量及其使用又提出了更高的要求。文章综述了硬质合金顶锤相关研究进展。首先,从顶锤的材质设计、生产制造、产品后处理、新型微观结构方面,对顶锤材质与生产进行探讨,以提高顶锤质量;其次,从顶锤的几何参数与调整、受力与失效分析、新型外观尺寸入手,阐述优化顶锤尺寸设计,以改善顶锤的应力分布状态;最后,从去应力时效、过盈量、小斜面摩擦力、冷却水、叶蜡石尺寸等使用技术方面进行总结,以提高顶锤的使用寿命。