Stability mechanism and control of the pumpable supports in longwall recovery room

The load-bearing performance(LBP)of pumpable supports(PPS)is crucial for the stability of longwall pre-driven recovery room(PRR)surrounding rock.However,the unbalanced bearing coefficient(UBC)of the PPS(undertaking unequal load along the mining direction)has not been investigated.A mechanical model of the PRR was established,considering the main roof cantilever beam structure,to derive an assessment formula for the load,the failure criteria,and the UBC of the PPS.Subsequently,the generation mechanisms,and influencing factors of the UBC were revealed.Global sensitivity analysis shows that the main roof hanging length(l_(2))and the spacing between the PPS(r)significantly impact the UBC.A novel design of the PPS and the coupling control technology were proposed and applied to reduce the UBC of the PPS in the adjacent longwall PRR.Monitor results showed no failure of the PPS at the test site,with the UBC(ζ)reduced to 1.1 consistent with the design value(1.15)basically,fully utilizing the collaborative LBP of the PPS.Finally,the maximum roof-to-floor convergence of the PRR was 234 mm,effectively controlling the stability of the surrounding rock of the PRR and ensuring the mining equipment recovery.

The Impact of Optimizing Details in the Operating Room on the Level of Knowledge, Attitude, and Practice of Hospital Infection Prevention and Control by Surgeons, as Well as the Effectiveness of Infection Control

Objective: This paper aims to explore the impact of optimizing details in the operating room on the level of knowledge, attitude, and practice of hospital infection prevention and control by surgeons, as well as the effectiveness of infection control. Methods: From January 2022 to June 2023, a total of 120 patients were screened and randomly divided into a control group (routine care and hospital infection management) and a study group (optimizing details in the operating room). Results: Significant differences were found between the two groups in the data of surgeons’ level of knowledge, attitude, and practice in hospital infection prevention and control, infection rates, and nursing satisfaction, with the study group showing better results (P Conclusion: The use of optimizing details in the operating room among surgeons can effectively improve surgeons’ level of knowledge, attitude, and practice in hospital infection prevention and control, reduce infection occurrence, and is worth promoting.

A Formal Testing Model for Operating Room Control System Using Internet of Things

Technological advances in recent years have significantly changed the way an operating room works.This work aims to create a platformto solve the problems of operating room occupancy and prepare the rooms with an environment that is favorable for all operations.Using this system,a doctor can control all operation rooms,especially before an operation,and monitor their temperature and humidity to prepare for the operation.Also,in the event of a problem,an alert is sent to the nurse responsible for the room and medical stuff so that the problem can be resolved.The platformis tested using a Raspberry PI card and sensors.The sensors are connected to a cloud layer that collects and analyzes the temperature and humidity values obtained from the environment during an operation.The result of experimentations is visualized through a web application and an Android application.The platform also considers the security aspects such as authorization to access application functionalities for the Web and the mobile applications.We can also test and evaluate the system’s existing problems and vulnerabilities using the IEEE and owasp IoT standards.Finally,the proposed framework is extended with a model based testing technique that may be adopted for validating the security aspects.

Secure and Performant Handling CIM-Based Data Streams in Control Room Software Interaction for Multi Vendor Solutions

Due to the increasing share of renewable energy, new requirements are placed on control room software. Such software is often exclusive to the supplier, but other suppliers could offer new and better methods. For security reasons, external applications often have no direct data access to control room software. Such software can provide information about the power grid via a periodic file transfer in CIM (Common Information Model) format. These files are often very large, containing complete records, delivering information not always relevant to the external applications. Extracting the relevant information required by external applications can be time-consuming, thus presenting a problem for time-critical applications. This paper presents a method allowing different applications to efficiently access the relevant data from the massive data stream contained in the CIM files. This method has been tested with a distribution system operator and clearly increases performance, allowing different applications to access the relevant data.

Application of Specialized Group Management in the Quality Control of Perioperative Nursing

Objective:To explore the role of specialized group management in the quality control of perioperative nursing.Methods:45 surgical nurses from our hospital were selected as the research subjects.Traditional operating room management was adopted from July 2019 to June 2020,and specialized group management was adopted from July 2020 to June 2021.The surgeon’s satisfaction,surgical nurses’core professional competence,and surgical patients’satisfaction were obtained through surveys and the results were analyzed.Results:Surgeon satisfaction before the implementation of specialized group management was significantly lower than after its implementation(P<0.05).Besides,surgical nurses’core professional competency scores before the implementation of specialized group management were significantly lower than after its implementation(P<0.05).Lastly,surgical patients’satisfaction before the implementation of specialized group management was significantly lower than after its implementation(P<0.05).Conclusion:Specialized group management helps to improve the quality of perioperative care and should be applied in clinical practice.

AREVA Control Room Accident Filtration System CRAFT

The AREVA CRAFT （control room accident filtration system） is a solution that maintains the proper air conditions in the main control room and emergency control facilities by filtering the air and removing noble gases in case of a severe accident in a nuclear power plant with increased activity concentration in the plant environment.

基于flexROOM方案的房间自动化系统设计

为实现办公室照明、遮阳和暖通联动控制、节能降耗、精细化管理的目的,基于WAGO公司的flexROOM方案设计了一套房间自动化系统。重点介绍了房间自动化系统的拓扑结构和控制策略,分析了房间自动化系统的应用效果。结果表明,在办公室应用flexROOM方案进行房间自动化控制,可实现对房间的精细化控制且满足多样化的客户需求,具有较高的推广应用价值。

既有建筑抗爆防护改造试验研究

我国有许多石油化工工厂非抗爆控制室、机柜间等建筑建在了易燃易爆炸的装置区临近位置,当遇到爆炸冲击波后对室内人员和设备会造成严重的伤害。文章对如何能在不影响生产的情况下对既有建筑进行抗爆改造分析,通过对多种抗爆改造加固法的比选及抗爆涂层爆炸试验测试,选出了既安全又不影响生产的抗爆改造方案,大大提升了既有建筑物的抗爆能力,保护了人员生命安全和设备安全,解决了因搬迁停车停产对工厂造成的经济损失。

Ground pressure and overlying strata structure for a repeated mining face of residual coal after room and pillar mining

To investigate the abnormal ground pressures and roof control problem in fully mechanized repeated mining of residual coal after room and pillar mining, the roof fracture structural model and mechanical model were developed using numerical simulation and theoretical analysis. The roof fracture characteristics of a repeated mining face were revealed and the ground pressure law and roof supporting condi- tions of the repeated mining face were obtained. The results indicate that when the repeated mining face passes the residual pillars, the sudden instability causes fracturing in the main roof above the old goal and forms an extra-large rock block above the mining face. A relatively stable ＂Voussoir beam＂ structure is formed after the advance fracturing of the main roof. When the repeated mining face passes the old goaf, as the large rock block revolves and touches gangue, the rock block will break secondarily under overburden rock loads. An example calculation was performed involving an integrated mine in Shanxi province, results showed that minimum working resistance values of support determined to be reason- able were respectively 11,412 kN and 10,743 kN when repeated mining face passed through residual pillar and goaf. On-site ground pressure monitoring results indicated that the mechanical model and support resistance calculation were reasonable.

Preventing roof fall fatalities during pillar recovery:A ground control success story

For decades, pillar recovery accounted for a quarter of all roof fall fatalities in underground coal mines.Studies showed that a miner on a pillar recovery section was at least three times more likely to be killed by a roof fall than other coal miners. Since 2007, however, there has been just one fatal roof fall on a pillar line. This paper describes the process that resulted in this historic achievement. It covers both the key research findings and the ways in which those insights, beginning in the early 2000 s, were implemented in mining practice. One key finding was that safe pillar recovery requires both global and local stability.Global stability is addressed primarily through proper pillar design, and became a major focus after the2007 Crandall Canyon mine disaster. But the most significant improvements resulted from detailed studies that showed that local stability, defined as roof control in the immediate work area, could be achieved with three interventions:(1) leaving an engineered final stump, rather than extracting the entire pillar,(2) enhancing roof bolt support, particularly in intersections, and(3) increasing the use of mobile roof supports(MRS). A final component was an emphasis on better management of pillar recovery operations.This included a focus on worker positioning, as well as on the pillar and lift sequences, MRS operations,and hazard identification. As retreat mines have incorporated these elements into their roof control plans,it has become clear that pillar recovery is not ‘‘inherently unsafe." The paper concludes with a discussion of the challenges that remain, including the problems of rib falls and coal bursts.

Analysis of the Effect and Solution of Geomagnetic Room Humidity on Geomagnetic Observation

It is not easy to control humidity in a geomagnetic room. If humidity is too high or the change is too fast it will lead to an abnormal change on data. The intelligent real-time humidity analysis and monitoring system of a geomagnetic room and probe can not only monitor and display the change of humidity in the geomagnetic room and send an alarm signal when it exceeds the pre-set range, but also dehumidify intelligently. One can arbitrarily control the sensor to monitor the ambient humidity of the probe in order to ensure that the data is stable and true. The design idea and main functions of the system are introduced in the paper.

Design of Fuzzy Controller for Central Air Conditioner

A structure of central air conditioning system in building and its running pattern are proposed in order to perform optimum energy saving strategy. The design of room temperature controller is taken as an example to discuss the design of fuzzy controller using common microprogrammed control unit (MCU) in detail. Based on fuzzy theory the query control tables fixed in read only memory (ROM) of MCU are established to realize the energy saving in the room temperature controller and the reasoning procedure is analyzed. The diagram of hardware design and the flow chart of software of room temperature controller are presented. The results show that the proposed method is practical and effective to achieve the energy saving goal.

Numerical Study on Effects of Door-Opening on Airflow Patterns and Dynamic Cross-Contamination in an ISO Class 5 Operating Room

The contamination diffusion to the operating room when the door is open was simulated with a computational fluid dynamic(CFD) method,to give the extent of the contamination diffusion.The influence of the door-opening procedure was ignored since the door of the operating room is normally a sliding one.The flow field in the case of the 16 s course of opening the door was simulated.The simulated and the experimental results demonstrate that the extent of the contamination diffusion is around 1.5 m when there is no temperature difference between indoor and outdoor,and there is hardly any contamination diffusion when the temperature difference is 1 ℃.It can be concluded that the positive pressure difference in the operating room lost its function in preventing the contamination when the door is open.That the temperature of corridor is lower than that of operating room contributes to contamination control.Keeping 1 ℃ temperature difference between corridor and operating room and increasing positive pressure and air flow are suggested.It is more secure to set up an anteroom if persons come in or out of the operation room at the course of surgery.

PEST Analysis of the Development and Challenge of Macao’s 2015 Tobacco Control Law

The Legislative Assembly of the Macao Special Administrative Region passed the 2015 Tobacco Control Laws on July 10, 2015, stimulating a heated discussion and debate in society. In this study, a content analysis of news coverage appearing in Macao Daily between July 1, 2015 and December 31, 2015 was conducted. It also applied PEST method to carry out detailed analysis of the public’s opinions, aiming at gaining a better understanding of the current situation of tobacco control work in Macao and the challenges lay ahead. Moreover, we use KAP （Knowledge-Attitude-Practice） framework to propose further enhancement and improvement of government’s tobacco control work.

Digital Instrumentation and Control System for Unit 5 ＆ 6 of YangJiang NPP

The article describes the digital instrumentation and control system for unit 5 ＆ 6 of YangJiang NPP, involving the overall I ＆ C （instrumentation and control） structure, the basic requirements and independent verification and validation. Advanced I ＆ C systems for YangJiang NPPs have to meet increasing demands for safety and availability. Additionally, the specific requirements coming from the nuclear qualification have to be fulfilled.

木质材料对室内声学调控的研究进展

木材为多孔性材料,在室内空间中,使用木质材料除了具有饰面作用外,还可以有效吸收声能,控制室内混响时间,改善音质,提高语言清晰度。本文概述了木质材料的吸声和隔声性能两方面的研究现状,并对未来的研究提出了建议。在此基础之上,总结了前人在大型建筑空间、小型办公空间、家居室内空间中声环境调控的不足之处。主要有以下3点:1)研究者多选取某一特定的室内空间类型进行声环境改善,尚缺乏对不同使用功能的室内空间声环境的规律性研究,以形成较为系统的室内声环境调控体系。2)成片的家具几何结构改变室内声环境的程度有待进一步研究验证。3)对于改变空间的形状、比例、布局的方法有待进一步研究其内在规律,为设计师、建筑师和科研人员提供参考依据。未来研究重点包括:1)通过使用木质材料对空间进行合理化布局与设计;2)处理好不均匀的声频或室内声场驻波的简并现象,需合理选择吸声构件。3)建立智能化声学仿真模型。

洁净手术室气流组织效果的影响因素综述

我国医院建设规模庞大、分布广泛,就医人数居世界第一,医疗洁净手术室空气洁净技术发展迅速。手术室的气流组织是其空气洁净技术的重要方面,与手术部位感染的关系一直存在争议。本文对手术室中的气流组织形式进行了综述。研究表明,层流通风和温控气流通风在去除携带细菌的颗粒方面具有优势,且层流通风对飞沫的控制能力更强。本文梳理了手术室内人员数量和位置、手术人员的动作和流动、医用设备的数量和发热量、人员着装和手术台次等因素对气流组织效果的影响。发现手术人员的动作和流动是相关研究的热点,气流组织与手术人员、患者热舒适的关联仍有待深入。未来研究方向包括手术室内局部气流组织与手术微环境空气质量的定量关系、新型气流组织形式和末端、个性化通风与手术人员热舒适等。

多联手术室的创新模式及其应用

基于固化的通仓手术室模式,阐述了创新型的多联手术室布局和模式,并以华中科技大学协和深圳医院为实例,介绍了多联手术室的设计与建设,得出多联手术室使通仓手术室不再通仓,成为可分可隔的大开间手术室的结论,可适用于我国各类医院。

TOPCARES-CDIO与目标导向管理在手术室新护士培训中的应用

目的探讨以目标为导向的计算机教育改革-构思、设计、实施、运行(target oriented project centered authenticity enhanced reform of computer education based on-conceive,design,implement,operate,TOPCARES-CDIO)理念结合目标导向管理在手术室新进护士教育培训中的应用效果。方法采用前后对照研究设计,选取2019年1月—2023年6月于河北大学附属医院手术室工作不足1年的60名新进护士,随机分为对照组与试验组,每组30名。对照组采用传统的教育培训模式,试验组采用TOPCARES-CDIO理念结合目标导向管理的教育培训模式。比较2组新进护士培训前后的核心能力、护理实践行为、职业获益感、技能能力、护理质量和医患满意度等指标的变化。结果培训后,2组新进护士的核心能力、护理实践行为、职业获益感、技能能力、护理质量和医患满意度得分高于护理前,且试验组高于对照组,差异有统计学意义(P<0.05)。结论TOPCARES-CDIO理念结合目标导向管理的教育培训模式能有效提高手术室新进护士的核心能力、护理实践行为、职业获益感、技能能力、护理质量和医患满意度,有利于促进手术室新进护士的专业发展和团队协作。

通仓交融手术室的实施效能

基于英、德等发达国家用于解决大量髋关节或膝关节置换手术需求的通仓手术室,针对我国日益增加的肺部手术量,运用仿真模拟(Computational Fluid Dynamics,简称CFD)技术分析国外通仓手术室气流特点,通过模拟进行比选,进而对通仓手术室实体模型进行实测选优,研发出适合肺部手术的通仓交融手术室,已在同济大学附属上海市肺科医院手术部建成并投入运行。一年多的运行表明,通仓交融手术室在保证手术环境控制的基础上,不仅破解了高级医护人员不足的窘境,同时缩短了每台手术换台时间、加快手术周转率,提高了手术室使用效率,实现了降低每次手术成本的经济效益,以及让有限的医疗资源服务更多患者的社会效益,值得应用与推广。