Recovering from prolonged cardiac arrest induced by electric shock:A case report

BACKGROUND Cardiac arrest(CA)induced by electric shock is a rare occurrence,particularly in cases of prolonged CA.Currently,there is limited literature on similar incidents,and we present a relevant case report.CASE SUMMARY A 27-year-old Asian male man,experiencing respiratory CA due to electric shock,was successfully restored to sinus rhythm after 50 min of cardiopulmonary resuscitation and 8 electrical defibrillation sessions.In the subsequent stages,the patient received multiple organ function protection measures,leading to a successful recovery and eventual discharge from the hospital.CONCLUSION Prolonging resuscitation time can enhance the chances of survival for patients,this study provide valuable insights into the management of electric shock-induced CA.

Vibration energy regeneration of electric vehicle shock absorber

The twin-tube shock absorber was studied and the relevant factors of thermal equilibrium were simulated. The dynamic model of the shock absorber was constructed and simulation curves of force-displacement and force-velocity were output. The experiment of the twin-tube shock absorber was carried out, and the results were compared with the modeling resultss. Further, the vibration energy regeneration model was established, and the bench simulation study was carried out. The re- sults showed that the energy regeneration model not only absorbed shock energy but also converted vibration energy into electricity energy.

The Mechanical Analysis and Experimental Study of Shock Wave Effect of Electrical Discharge under Water In Filth Cleaning

Filth adhering to metal pipes can be cleaned by shock wave generated by electrical discharge under water. The mechanism of shock wave effect of electrical discharge under water on filth cleaning is analyzed by building a mechanical model. A metal pipe coated with cement to simulate real filth is cleaned by using electrical discharge under water. The experimental results confirm the mechanical analysis and also show the technology of electrical discharge under water is an very effective method for filth cleaning.

Modeling of the Coupling of the Lightning Shock Wave Flow Circuit in the High Voltage Electrical Network

This article focuses on the aggression of lightning overload on the equipment of the electrical network of sites where storm activity is very dense;and the electrocution of people located in the direct environment of the high-voltage substation during the flow of lightning current to the ground through the ground socket. The modeling of the flow circuit of the shock wave consisting of guard wire, lightning arrester and ground socket couple to the transformer of the high voltage substations, thanks to the approach of a servo block, led to the synthesis of a PID regulator (corrector) whose action is to reject the effects of the overvoltage on the network equipment and to significantly reduce or even cancel the effects of the step or touch voltage due to the distribution of the potential around the ground socket;and thus improve the quality of service of the high-voltage transmission and distribution electricity network, especially in stormy times.

Rhegmatogenous retinal detachment following electrical shock injury

Dear Editor,We present a case of 'Rhegmatogenous retinal detachment following electrical shock injury' for evaluation for publication in your journal. To our knowledge,this is the first case of retinal tears and retinal detachment caused by an electrical shock reported in the literature. That

Study of External Characteristics of Hydraulic Electromagnetic Regenerative Shock Absorber

According to the composition and the principle of the liquid-electric energy-sensing damper, the corresponding hydraulic regenerative model is designed. In this paper, an advanced type of shock absorber combined with the mechanical and electromagnetic hydraulic structure has been proposed that recycles the energy dissipated by shock absorber in the driving process. In addition, the damping characteristics of the conventional mechanical vehicle and the advanced hydraulic regenerative mechanical vehicle have?been analyzed by using AMESim simulation. The regenerative suspension is reformed from the traditional hydraulic and pneumatic suspension. The suspension absorbs kinetic energy converts it into hydraulic potential and pneumatic power to be stored in the accumulator. The kinetic energy is then converted into electricity instead of heat by using the hydraulic suspension and Power-Generating Shock Absorber (PGSA). The AMESim simulation results have efficiently verified the displacement characteristics curves and flow rate of hydraulic fluid in the body. Finally the conversion of energy produced by advanced hydraulic regenerative mechanical vehicle transferred into electrical energy. The designed hydraulic shock absorber allows a significant fuel saving of 1.5% to 4% depending on the vehicle and driving conditions.

Myocardial Injury after Electric Accident: Dynamic Change of Cardiac Biomarkers Was the Important Key for Diagnosis of This Serious Complication

This report was aimed to record the value of dynamic change of cardiac biomarkers in diagnosis of serious myocardial injury in electrical shock. One female patient was admitted to the emergency department, Cho Ray-Phnom Penh Hospital, Phnom Penh, Cambodia after electrical accident, in cardiopulmonary arrest status with no pulse, no breath. The cardiopulmonary resuscitation was done immediately as intra-tracheal ventilation, fluid replacement with NaCl 0.9%, urine alkalinization therapy with Natribicarbonate 4.2%, sympathomimetic agents as adrenaline and nor-adrenaline, and IV nutrition with glucose 30%. Cardiac biomarkers were repeated many times over 12 hours after admission. Troponin I increased 1000 times higher from 0.02 ng/mL on admission to 20.1 ng/mL within 12 hours. CK-MB increased from 55.4 to 227 U/L after 2 hours (normal value: <16 U/L). CPK (normal value: 90 - 140 U/L) changed quickly from 99 U/L on admission to a very high level as 9681 U/L after 12 hrs. The CK-MB/CPK index (defined as CK-MB × 100/CPK, unit as %) changed from 55.9% to 2.7%, respectively by time. In conclusion, the very quick dynamic change of cardiac biomarkers suggested the presence of serious myocardial injury among multiple organs injured in electric shock.

Discharge and post-explosion behaviors of electrical explosion of conductors from a single wire to planar wire array

This work deals with an experimental study of a Cu planar wire array(PWA)in air and water under the stored energy 300-1200 J.A single Cu wire is adopted as a controlled trial.Four configurations of PWA and a wire with the same mass(cross-section area)but the different specific surface areas(15-223 cm^(2)g^(-1))are exploded.The transient process is analyzed using high-speed photography in combination with the results of optical emission and discharge.Discharge characteristics revealed that PWA always has a higher electric power peak,early but higher voltage peak,as well as faster vaporization and ionization process than the single-wire case.Two to three times stronger optical emission could be obtained when replacing the single-wire with PWA,indicating a higher energy-density state is reached.Phenomenologically,in both air and water,single-wire load tends to develop a transverse stratified structure,while PWA is dominated by the uneven energy deposition among wires.Finally,the synchronism and uniformity of the PWA explosion are discussed.

Towards Realistic Vibration Testing of Large Floor Batteries for Battery Electric Vehicles (BEV)

This contribution shows an analysis of vibration measurement on large floor-mounted traction batteries of Battery Electric Vehicles(BEV).The focus lies on the requirements for a realistic replication of the mechanical environments in a testing laboratory.Especially the analysis on global bending transfer functions and local corner bending coherence indicate that neither a fully stiff fixation of the battery nor a completely independent movement on the four corners yields a realistic and conservative test scenario.The contribution will further show what implication these findings have on future vibration&shock testing equipment for large traction batteries.Additionally,it will cover an outlook on how vibration behavior of highly integrated approaches(cell2car)changes the mechanical loads on the cells.

不均衡小样本下多特征优化选择的生命体触电故障识别方法

针对现有的剩余电流保护装置无法有效识别触电事故的问题,该文提出了一种不均衡小样本下多特征优化选择的生命体触电故障识别方法。首先通过变分自编码器(VAE)对实验收集到的生命体触电小样本数据进行增殖以实现正负样本均衡;然后在时域上提取能够反映波形动态变化特性的23个特征量,并利用高斯核Fisher判别分析(GKFDA)与最大信息系数(MIC)法从中选择最优表达特征组;最后,提出基于遗忘因子的在线顺序极限学习机(FOS-ELM)算法实现生命体触电行为的鉴别。实验结果表明,所提方法利用不均衡小样本触电数据集就可以训练出一个优秀的分类模型,诊断准确率可达98.75%,诊断时间仅为1.33 ms。其优良的性能结合在线增量式学习分类器设计,使得模型具备新知识学习能力,具有极好的工程应用前景。

某型直升机超短波电台结构设计

本文开展了适用于某型直升机平台的机载超短波电台结构设计,从结构总体设计、电气互联设计、散热设计、抗冲振性能设计、三防设计等角度,全方位的阐述了设备的结构设计过程,可为同类设备的结构设计提供借鉴。

带蒂旋髂浅动脉穿支皮瓣与躯干任意皮瓣修复手部电击伤致软组织缺损疗效对比

目的对比分析带蒂旋髂浅动脉穿支皮瓣与躯干任意皮瓣修复手部电击伤致软组织缺损的临床疗效。方法选取2017年5月至2022年6月河南科技大学第一附属医院收治的82例手部电击伤致软组织缺损患者作为研究对象,按照不同治疗方式将其分为试验组(40例)和对照组(42例),试验组患者软组织缺损创面采用带蒂旋髂浅动脉穿支皮瓣进行修复,对照组患者软组织缺损创面采用躯干任意皮瓣进行修复,对比观察两组患者皮瓣血管蒂长度、住院时间、创面愈合时间、手指关节总主动活动度、皮瓣受区支配区域感觉功能与并发症(淋巴瘘、血管危象、瘢痕挛缩)发生情况。结果试验组患者皮瓣血管蒂长度为(789±113)cm,明显长于对照组患者的皮瓣血管蒂长度(629±121)cm(t=6181,P<0001);住院时间为(3114±492)d、创面愈合时间为(4019±1023)d,明显短于对照组患者的住院时间(3358±503)d、创面愈合时间(4662±1141)d(t=2219、2682,P=0029、0009)。术后4个月,试验组患者手指关节总主动活动度为良20例、中16例、差4例,明显优于对照组患者的手指关节总主动活动度为良10例、中20例、差12例(Z=-2762,P=0006);试验组患者皮瓣受区支配区域感觉功能为5级8例、4级12例、3级11例、2级7例、1级2例,明显优于对照组患者的皮瓣受区支配区域感觉功能为5级1例、4级10例、3级10例、2级13例、1级7例、0级1例(Z=-3005,P=0002)。试验组患者术后并发症发生率为1750%,明显低于对照组患者的术后并发症发生率4048%(χ^(2)=5224,P=0022)。结论与躯干任意皮瓣相比,带蒂旋髂浅动脉穿支皮瓣可有效修复手部电击伤所致的软组织缺损,促进手部运动功能及感觉功能恢复,降低淋巴瘘等并发症发生率。

一种适用于海洋平台的电控手柄的结构设计

海洋平台是长期远离港口的外海海域从事钻探和石油开采的人工岛,由于长期处于海风、海浪、潮流、地震等恶劣环境下,会造成海洋平台产生强震动的现象,从而有可能造成平台设备故障以及危及作业人员的生命安全。为了提高海洋平台的抗震能力,提出了一种采用机械锁定结构进行定位的离散型电控手柄的设计方案,并对此设计方案进行小批量加工验证以及疲劳寿命实验验证。结果显示,采用机械结构进行定位的电控手柄可以满足抗震性的要求,并且在经过1×10^(6)次加速疲劳寿命测试后,该电控手柄结构仍然可以快速、准确定位,且测试前后挡位反馈力变化幅度较小。综合上述实验结果,这种采用机械锁定结构进行定位的离散型电控手柄的设计方案可以有效避免由于海洋平台的强震动而产生跳档、脱档的问题,并且具有较高的可靠性与稳定性,可以满足海洋平台电控手柄的使用要求,并且可为后续同类型的电控手柄研究提供实验依据。

光伏火灾带电扑救触电安全性分析研究

由于光伏发电系统在有光照条件下会持续发电,故无法切断其电源,而使用传统的灭火剂扑救光伏火灾时会发生触电事故。为研究传统灭火剂在带电状态下扑救光伏发电系统直流侧高压的触电风险,提出了光伏火灾带电扑救试验平台和试验方法。通过试验发现:泡沫、水基灭火剂、二氧化碳等灭火剂在扑救直流侧300~1 500 V高压光伏火灾时,由于灭火剂的绝缘性而无法形成回路,从而不具备导电性;消火栓水枪和多功能水枪带电扑救过程中枪头带有直流电,枪头电压随流量和距离的变化而变化,由于多功能水枪水柱中心为空气,显著降低了水柱的电导率,因此,多功能水枪比消火栓水枪更适合扑救光伏发电系统带电火灾。通过拟合得到了多功能水枪带电扑救过程中水电导率的计算方法,计算确定了水枪一级和二级带电扑救的安全距离。带电扑救过程中的扑救距离要严格大于一级安全扑救距离,二级扑救距离范围内要采取相应的防护措施,以防止触电事故的发生。

可控冲击波震源技术在陕北沙漠区地震勘探的应用

针对现有地震勘探震源存在问题和局限性,创新性地将金属丝电爆炸可控冲击波技术应用于地震勘探中,分析了金属丝电爆炸可控冲击波技术和产生原理。在掌握金属丝电爆炸可控冲击波技术作为地震勘探震源技术的特点和陕北沙漠地区进行现场激发试验的情况下,从理论分析和现场试验验证了金属丝电爆炸可控冲击波技术作为震源技术的可行性。通过对获取的数据进行定量分析,认为可控冲击波技术可作为一种新型震源技术,且在陕北沙漠区煤田地震勘探领域具备较好的应用发展前景。同时,通过总结试验中存在的问题,为下一步的改进提供方向。

新能源电动汽车中的馈能减震模块设计

阐述新能源电动汽车馈能减震模块应用的现状,探讨新能源电动汽车馈能减震模块改进的优势,可以提高汽车的续航经济性、增强车辆的转向能力、改善车辆的驾驶舒适性、延长汽车零部件寿命。

基于特征混叠分析与贝叶斯-随机森林的触电辨识方法研究

针对低压配电系统中特征混叠导致生物触电辨识困难的问题,提出基于贝叶斯-随机森林的生物触电辨识方法。首先,对包括非生命体对照组在内五种触电类型的电流波形进行特征分析,研究相同触电特征在不同类别中的混叠情况。其次,通过贝叶斯优化算法对随机森林模型超参数进行寻优,采用bagging方法、使用真实样本对随机森林进行数据拟合,描述了随机森林集成辨识机制的运作方式,以及方法的具体实施流程。再次,在136802个包含五种类型的测试样本中进行方法验证,总体准确率为96.276%。最后,与现有方法进行对比,验证了所提方法在触电辨识方面的优越性。

浸水防触电保护器产品风险分析及对策研究

针对浸水防触电保护器产品宣传的防火功能、漏电保护功能、过欠压保护功能、防雷功能、浸水防触电功能等可能涉及人身健康安全的风险因素,本文对市面上销售的浸水防触电保护器产品进行购样检测、风险识别、分析论证等以研究浸水防触电保护器产品的安全性能。针对性为消费者提供相关产品购买及使用建议,为市场监管提供检测信息及技术支撑,为相关产品质量提升提供建议,全面提升产品安全水平。

变频器抗晃电的直流支撑技术研究

随着现代社会的蓬勃发展,人们的生活与社会生产都需要使用大量电能。尤其是化工、冶金等连续型生产企业,在其生产过程中要求供电不中断,为生产活动的工艺流程提供持续不断的电流。变频器在工业生产中具有重要作用,能够通过调节电源频率来控制机械设备的速度,满足生产过程中对不同设备的调速需求。系统电压的短时波动将导致变频器失压停机,进而造成整条生产线停机,给生产企业造成了严重的经济损失,因此强化变频器抗晃电具有一定的现实意义。通过动能缓冲技术、直流支撑技术来实现变频器的抗晃电,能够为企业的生产活动提供稳定电流,保障电力设备的安全性,有助于提高生产企业的经济效益。通过分析变频器抗晃电的直流支撑技术路线,研究Boost技术、高频变压技术以及晶闸管技术等抗晃电技术方案的使用原理及其优缺点。

Air Plasma Mitigation of Shock Wave

Shock wave is a detriment in the development of supersonic aircrafts;it increases flow drag as well as surface heating from additional friction;it also initiates sonic boom on the ground which precludes supersonic jetliner to fly overland. A shock wave mitigation technique is demonstrated by experiments conducted in a Mach 2.5 wind tunnel. Non-thermal air plasma generated symmetrically in front of a wind tunnel model and upstream of the shock, by on-board 60 Hz periodic electric arc discharge, works as a plasma deflector, it deflects incoming flow to transform the shock from a well-defined attached shock into a highly curved shock structure. In a sequence with increasing discharge intensity, the transformed curve shock increases shock angle and moves upstream to become detached with increasing standoff distance from the model. It becomes diffusive and disappears near the peak of the discharge. The flow deflection increases the equivalent cone angle of the model, which in essence, reduces the equivalent Mach number of the incoming flow, manifesting the reduction of the shock wave drag on the cone. When this equivalent cone angle exceeds a critical angle, the shock becomes detached and fades away. This shock wave mitigation technique helps drag reduction as well as eliminates sonic boom.