Resilience-Oriented Load Restoration Method and Repair Strategies for Regional Integrated Electricity-Natural Gas System

The rising frequency of extreme disaster events seriously threatens the safe and secure operation of the regional integrated electricity-natural gas system(RIENGS).With the growing level of coupling between electric and natural gas systems,it is critical to enhance the load restoration capability of both systems.This paper proposes a coordinated optimization strategy for resilience-enhanced RIENGS load restoration and repair scheduling and transforms it into a mixed integer second-order cone programming(MISOCP)model.The proposed model considers the distribution network reconfiguration and the coordinated repair strategy between the two systems,minimizing the total system load loss cost and repair time.In addition,a bi-directional gas flow model is used to describe the natural gas system,which can provide the RIENGS with more flexibility for load restoration during natural gas system failure.Finally,the effectiveness of the proposed approach is verified by conducting case studies on the test systems RIENGS E13-G7 and RIENGS E123-G20.

Self-assembling peptide nanofibrous hydrogel as a promising strategy in nerve repair after traumatic injury in the nervous system

Following injury in central nervous system（CNS）,there are pathological changes in the injured region,which include neuronal death,axonal damage and demyelination,inflammatory response and activation of glial cells.The proliferation of a large number of astrocytes results in the formation of glial scar.

Image Repair Strategies in the Pricey Prawn Scandal of Qingdao

The pricey prawn scandal of Qingdao in the 2015 National Day Holiday,not only violates the principle of integrity management,but also seriously damages the image of Qingdao—World Famous Tourist City.This study applies image repair strategies to Qingdao municipal government departments' attempt to restore its damaged image in crisis communication.Through a discourse analysis,it is found that the government departments mainly adopt the following strategies: denial,evasion of responsibility(defeasibility),reduction of offensiveness(bolstering,compensation),corrective action and mortification.Then we evaluate the effectiveness of this image repair effort.

Application of dynamic programming to structural repairing strategies

A model of dynamic programming for repairing strategies of concrete structures during a projected service period is proposed, which takes into account the degradation in strength of components and the probability of accidental load. This model takes the safety grade of a structural system as the state variable of repairing strategies, and incorporates economic factors including expected repair cost, property loss due to structure failure, goods and material loss due to structure failure, loss of production interrupt due to structure failure, and inspection cost in decision making. It is found that the optimal repairing strategies are sensitive to the probability of accidental loads as well as the failure costs. The practicality of the model is demonstrated by an example.

“To measure is to know”: how advances in image analysis are supporting neural repair strategies

Neuronal regeneration in the peripheral nervous system arises via a synergistic interplay of neurotrophic factors,integrins,cytoskeletal proteins,mechanical cues,cytokines,stem cells,glial cells and astrocytes.

梯度人工骨修复支架调控骨骼系统组织的修复与再生

背景:梯度人工骨修复支架模拟了骨骼系统中的独特特征,在骨骼系统再生中具有巨大的应用潜力。目的:综述梯度人工骨修复支架在骨骼系统组织工程中的最新研究进展,并阐述了其优势与制造策略。方法:由第一作者检索Web of Science和PubMed数据库2000-2023年发表的文献,英文检索词为“gradient,bone regeneration,scaffold”,最终筛选后对76篇文献进行分析总结。结果与结论:①作为骨骼系统组织高效、高质量修复的重要手段,梯度人工骨修复支架目前针对骨组织、骨-软骨、肌腱-骨组织的天然梯度特征进行了仿生设计,这些支架能够一定程度地从结构、成分上模拟原生组织的细胞外基质,从而促进细胞黏附、迁移、增殖和分化,促进受损组织向原生状态再生恢复。②先进制造技术为梯度人工骨修复支架制备提供了更多可能;目前已经开发了通过空间差异化纤维排布和生物活性物质加载构建的梯度电纺纤维支架;分层叠加、分级孔隙率与生物3D打印技术制造的梯度3D打印支架;原位分层注射、简单逐层叠加、冷冻干燥法制造的梯度水凝胶支架;另外还包括其他方式或多方法联用的支架;这些支架在体外实验中展示了良好的生物相容性,在小型动物实验中能够加速组织再生并且观察到组织学结构明显改善。③目前开发的梯度人工骨修复支架仍需进一步优化,提高在梯度尺度上的匹配性,进一步明确材料与组织相互作用,避免降解产物导致的副反应等问题,未来需要结合相关学科优势与临床需求进一步优化。

Role and prospects of regenerative biomaterials in the repair of spinal cord injury

Axonal junction defects and an inhibitory environment after spinal cord injury seriously hinder the regeneration of damaged tissues and neuronal functions. At the site of spinal cord injury, regenerative biomaterials can fill cavities, deliver curative drugs, and provide adsorption sites for transplanted or host cells. Some regenerative biomaterials can also inhibit apoptosis, inflammation and glial scar formation, or further promote neurogenesis, axonal growth and angiogenesis. This review summarized a variety of biomaterial scaffolds made of natural, synthetic, and combined materials applied to spinal cord injury repair. Although these biomaterial scaffolds have shown a certain therapeutic effect in spinal cord injury repair, there are still many problems to be resolved, such as product standards and material safety and effectiveness.

Insights of stem cell-based endogenous repair of intervertebral disc degeneration

Low back pain has become more prevalent in recent years,causing enormous economic burden for society and government.Common therapies used in clinics including conservative treatment and surgery can only relieve pain.Subsequent cell-based treatment such as mesenchymal stem cell transplantation poses problems such as short duration of therapeutic effect and tumorigenesis.Recently,the discovery and identification of stem cell niche and stem/progenitor cells in intervertebral disc bring increased attention to endogenous repair strategy.Therefore,we review the studies involving endogenous repair strategy and present the characteristics and current status of this treatment.Meanwhile,we also discuss the strategy and perspective of endogenous repair strategy in future.

A Content Analysis of the Image Repair Discourses of OSI Group in China's Food-safety Scandal

Food safety is one of the top issues for Chinese consumers. In the summer of 2014,Shanghai-based Husi Food Co Ltd was mired in a food-safety scandal. OSI Group responded to this situation by releasing statements and holding China press conference. This study focused on OSI Group's image repair strategies employed in the scandal in Chinese context. A content analysis revealed that OSI Group's image repair relied primarily on six strategies: defeasibility( appalled by the event),bolstering( factory in Henan is state-of-art),minimization( it was an isolated event),corrective action( thorough internal investigation),and mortification( sincerely apologized),and attacking the accuser( launched OSI Food Safety Education Campaign). Basically,OSI Group's mortification without compensation doomed its efforts to failure.Implications for implementing image repair strategies with the combination of crisis types are addressed.

Model Predictive Control Strategy of Multi-Port Interline DC Power Flow Controller

There are issues with flexible DC transmission system such as a lack of control freedom over power flow.In order to tackle these issues,a DC power flow controller(DCPFC)is incorporated into a multi-terminal,flexible DC power grid.In recent years,a multi-port DC power flow controller based on a modular multi-level converter has become a focal point of research due to its simple structure and robust scalability.This work proposes a model predictive control(MPC)strategy for multi-port interline DC power flow controllers in order to improve their steady-state dynamic performance.Initially,the mathematical model of a multi-terminal DC power grid with a multi-port interline DC power flow controller is developed,and the relationship between each regulated variable and control variable is determined;The power flow controller is then discretized,and the cost function and weight factor are built with numerous control objectives.Sub module sorting method and nearest level approximation modulation regulate the power flow controller;Lastly,theMATLAB/Simulink simulation platformis used to verify the correctness of the establishedmathematicalmodel and the control performance of the suggestedMPC strategy.Finally,it is demonstrated that the control strategy possesses the benefits of robust dynamic performance,multiobjective control,and a simple structure.

A Novel Polymorphic Topology with Hybrid Control Strategy Based LLC Resonant Converter for Ultra-Wide Input Voltage Range Applications

To realize effective utilization of renewable energy sources,a novel polymorphic topology with hybrid control strategy based LLC resonant converter was analyzed and designed in this paper.By combining the merits of a full bridge LLC resonant converter,three-level half bridge LLC resonant converter,and variable frequency control mode,the converter realizes an intelligent estimation of input voltage by automatically changing its internal cir-cuit topology.Under this control strategy,different input voltages determine different operation modes.This is achieved in full bridge LLC mode when the input voltage is low.If the input voltage rises to a certain level,it operates in three-level half bridge LLC mode.These switches are digital and entirely carried out by the DSP(Digi-tal Signal Processor),which means that an auxiliary circuit is unnecessary,where a simple strategy of software modification can be utilized.Experimental results of a 500W prototype with 100V~600V input voltage and full load efficiency of up to 92%are developed to verify feasibility and practicability.This type of converter is suitable for applications with an ultra-wide input voltage range,such as wind turbines,photovoltaic generators,bioenergy,and other renewable energy sources.

工程机械维修与保养管理的优化策略研究

工程机械在现代化生产中有着不可替代的作用,然而在多年的生产运营中,工程机械的维修与保养管理却一直是困扰企业的痛点之一。长期以来,工程机械的维修与保养管理面临着预防性维修不足、维修人员技能水平不足等问题,导致设备的运行效率与可靠性都无法得到有效提升。因此,对工程机械维修与保养管理进行优化策略研究势在必行。本文研究其当前维修与保养管理存在的问题以及优化策略,旨在为研究优化工程机械维修与保养管理提供参考。

缺陷树脂修复体的临床处理策略

在五十余年的应用中,复合树脂直接粘接修复术已凸显出优异的临床效能。然而,修复效果并非一劳永逸,如何处理缺陷树脂修复体已成为口腔医生需要抉择的临床问题。依据修复体质量评价标准,缺陷树脂修复体的概念和分类得以细化,修补而非替换逐渐成为缺陷树脂修复体临床处理的首选方法。本文在回顾树脂修复体修补现况基础上,基于缺陷树脂修复体的问题表现进行治疗方案的归纳总结,进一步根据现代技术发展阐述陈旧树脂修补时,待粘接界面处理方法,以期为缺陷树脂修复体的临床处理提供更为明确的方案决策和处理技术。

基于预见性策略的精准护理用于口腔颌面肿瘤皮瓣修复术后的临床观察

目的 探讨基于预见性策略的精准护理用于口腔颌面肿瘤皮瓣修复术后的临床效果。方法 本研究选取2021年6月至2023年6月于新乡市中心医院收治的口腔颌面肿瘤皮瓣修复术后患者81例,所有患者均接受基于预见性策略的精准护理,对患者护理前后康复情况进行比较分析。结果 患者术后3 d的疼痛、皮瓣颜色、温度及毛细血管充盈度评分较术后6 h显著降低,差异有统计学意义(P<0.05)。本组患者中发生轻微感染2例,皮肤感觉异常1例,血管危象1例患者,并发症发生率为4.94%(4/81)。护理后患者生活质量评分较护理前高,差异有统计学意义(P<0.05),护理满意度为96.30%。结论口腔颌面肿瘤皮瓣修复术后应用基于预见性策略的精准护理可改善皮瓣状态,减少并发症,患者生活质量及护理满意度高。

负面事件对电商主播声誉的影响研究

主播声誉是消费者直播购物的重要信号和主播赢得市场地位的关键因素,维护良好的主播声誉是主播团队必须认真对待的核心议题。基于情景实验法探索负面事件对主播声誉的影响机制和主播声誉事后修复策略,结果发现:道德型负面事件和能力型负面事件对主播情感声誉的负向影响无显著差异,但能力型负面事件将显著降低主播认知声誉;消费者的能力信任与善意信任分别在负面事件影响主播的认知声誉与情感声誉方面起中介作用;主播负面事件与修复策略的交互作用显著,能力型负面事件在利益型修复策略下对消费者信任和主播声誉的修复效果优于情感型修复策略,道德型负面事件在两种修复策略下的修复效果无显著差异。因此,主播应重视负面事件的消极影响,根据不同的负面事件类型采取相应的差异化修复策略。

生态网络构建视角下矿山生态修复重点区域识别——以辽宁省建平县为例

采矿业是矿业城市经济来源的重要组成部分,对矿山进行系统的开发和修复是矿业城市生态安全的关键问题。立足于宏观视角下的矿山开采与修复,旨在通过生态网络构建识别出建平县矿山生态修复的重点区域。运用生境质量模型、生态系统服务价值评价识别生态源地。综合考虑自然因素、干扰因素、国土空间三线、矿山开采风险4个方面因素构建和修正阻力面。采用最小累积阻力模型(Minimum Cumulative Resistance Model,MCR)提取生态廊道,并结合生态廊道及其缓冲范围内的矿山类型、开采方式等因素,实现矿山开采风险分区,明确矿山开采和修复优先级。结果表明:①研究区共有生态源地28处,共计面积1139.53 km^(2),提取生态廊道1006 km。②矿山开采低、中、高风险区内分别包含生产矿山和废弃矿山的面积分别为17.92、10.62、25.77 km^(2)和22.5、14.10、21.93 km^(2)。③按照矿山空间分布对生态网络的影响程度,划分了生产矿山开采优先级和废弃矿山修复优先级分区;其中,优先开采区、限制开采区、禁止开采区内包含的生产矿山面积分别为17.93、11.80、23.63 km^(2),极重要修复区、重要修复区、一般修复区内包含的废弃矿山面积分别为19.79、16.55、22.48 km^(2)。根据以上分析,提出了矿山开采前、开采中以及开采后的相关监管策略和建议。

骨骼肌中卫星细胞衰老生物学机制及潜在的应对策略

背景:卫星细胞是一种肌源性干细胞,位于肌纤维膜与基底膜之间,但尚未有综述完全揭示卫星细胞衰老机制及其潜在应对策略,这对于当前减缓骨骼肌老化的策略应用难以起到有效的指导效果。目的:综述骨骼肌中卫星细胞衰老的机制及其相关减缓其衰老的应对策略。方法:检索各数据库时间截至2023年5月,包括Web of Science、PubMed、中国知网、万方和维普数据库。英文检索词:“Skeletal muscle,satellite cells,aging,mechanism,solution strategye”;中文检索词:“骨骼肌,卫星细胞,衰老,老化,机制,应对策略”。经过严格按照纳入和排除标准进行筛选,最终纳入78篇文献进行综述分析。结果与结论:①卫星细胞位于肌纤维膜与基底膜之间,具有增殖和分化潜能,通常处于静息状态,但在肌肉组织受刺激时会被激活并参与修复和恢复正常组织结构的过程,衰老会导致卫星细胞数量减少,并引发肌力和耐力的下降等症状。②卫星细胞衰老的机制主要涉及再生能力下降、串扰能力随生态位变化、年龄依赖性损失和异质性变化,衰老的卫星细胞数量减少以及活性降低会导致肌肉再生速度变慢和损伤恢复时间增加,且在分化过程中可能出现错误,从而导致肌肉质量下降和功能退化。③针对卫星细胞衰老的应对策略主要包括调节体内卫星细胞的受体环境、外源手段干预促进卫星细胞再生、人体肌肉模型构建和运动和饮食干预诱导卫星细胞增殖等,这些策略具有一定的潜力,可以为卫星细胞的再生和治疗骨骼肌疾病提供新的思路和方法。④未来的研究建议深入探究卫星细胞衰老机制,探究卫星细胞与生态位之间的相互作用,研究卫星细胞与免疫系统和线粒体功能等因素的关系,开发应用人体肌肉模型来提高研究深度和准确性。

三步标准化儿童二尖瓣成形手术在儿童容量负荷型二尖瓣反流中的应用

目的:探索儿童容量负荷型二尖瓣反流的最佳外科成形策略。方法:回顾2020年4月至2022年3月期间在中国医学科学院阜外医院接受初次二尖瓣成形术的110例容量负荷型二尖瓣反流患者,平均年龄(14.5±15.1)个月,男性42例(38.2%)。其中69例患者接受三步标准化儿童二尖瓣成形手术(标准化组),41例患者接受单纯瓣环环缩术(单纯环缩组)。倾向性评分匹配后,共纳入38对患者。比较两组主要终点事件(二尖瓣功能衰竭和术后心力衰竭)发生率。结果:在26.3(19.8,32.9)个月的电话随访及11.9(7.5,14.8)个月的超声心动图随访期间未发生全因死亡,共有1例(0.8%)患者发生院内计划外的二次成形手术,7例患者(单纯环缩组:标准化组=3:4)在术后6个月及以后的超声心动图随访提示中到大量二尖瓣反流复发,9例患者(单纯环缩组:标准化组=5:4)出院1个月后超声心动图提示心力衰竭,两组间差异无统计学意义。倾向性评分匹配后,标准化组体外循环时间[113(90,132)min vs.90(77,114)min]和主动脉阻断时间[80(61,92)min vs.62(49,83)min]均显著长于单纯环缩组(P均<0.05),其余结果差异均无统计学意义。基于年龄进行亚组分析,<1岁患者标准化组主要终点事件发生率(8.2%vs.26.9%P=0.041)和术后心力衰竭发生率(4.1%vs.19.2%,P=0.045)均显著低于单纯环缩组,且单纯环缩组术后末次超声心动图随访提示平均左心室舒张末期内径标准分数(LVEDD Z值)仍>2。结论:三步标准化儿童二尖瓣成形手术患者围术期恢复和术后转归并不劣于单纯瓣环环缩术患者;而对于<1岁的容量负荷型二尖瓣反流患者,该术式术后心力衰竭和主要终点发生率更低,更具推广意义。

特高压换流站抗震韧性及震后修复策略快速评估方法

地震作用下特高压换流站中设备极易损坏,然而由于资源条件限制使得震后抢修效率较低,从而导致了大量经济损失。为寻求高效的震后修复策略,该文搭建一套基于功能状态模型的抗震韧性快速评估框架。从结构和电气两方面建立换流站系统的二维功能网络模型,并利用贝叶斯网络进行功能状态快速评估。为提高系统震后修复效率,提出一种生物启发式多目标优化算法,利用震后迭代模拟得到系统阶梯型功能时变函数。通过对一典型±800 kV特高压换流站进行抗震韧性分析,得到换流站系统的关键抢修设备及最优修复策略,证明了最优修复策略的有效性和必要性。该框架量化了特高压换流站的震后修复过程及抗震韧性水平,可为换流站系统的震后应急抢修提供参考。

考虑员工疲劳度和休假的退化系统可靠性建模与检测策略研究

在退化系统检测维修策略的研究中,很少考虑人为因素对检测正确率的影响。事实上,考虑员工疲劳度水平和其工作状态可以更精确地评估和优化维修检测策略,帮助企业降低运维成本。本文考虑维修工的工作状态对检测结果的影响,通过建立疲劳度和检测正确率的函数关系,构建检测维修模型,以最小化维修成本为目标,优化员工工作时间安排、休假时间安排以及检测时间间隔;最后进行算例分析,针对各成本参数做敏感度分析,讨论参数变化时最优休假策略和维修策略的变化规律,从而寻找更广泛的优化适用性。结果表明检测出错成本大的系统,决策者应提高员工休假时间,降低检测频率;预防性维修成本高的系统,决策者应适当提高员工在岗时间并降低检测频率;停机机会成本更高的系统应提高员工在岗时间,同时提高检测频率。