Short Stroke Control with Gaussian Curve and PSO Algorithm in Plate Rolling Process

The precision width control is vital for product quality and production economy in plate width control process, so short stroke control method was used in plate rolling by opening or closing edger gap so as to avoid head end necking. Head end necking on different broadening ratio was analyzed, and sections of different elongations at edger roiling was calculated; based on the law of volume constancy, the adjustment functions were described by parabolic functions. Control curves were developed with three Gaussian curves by means of additional combining; SSC control curve was changed with different weights of those curves, w1 effect one-third of SSC length, w2 effect two-third of SSC length, w3 effect all three parts of SSC length. In order to adjust the amount of weights for precise quantification, PSO algorithm was used to build sufficiency function so as to obtain best rectangular degree by global optimization. Practical applications showed that the method proposed is available to improve the product rolling yields by 1.0% -2. 0% and worthy to apply to plate rolling.

Technological investigation on the Short Stroke Width Control Rolling in the Rougher Mills of Hot Strip Continuous Rolling Mill Train

According to technological requirement of hot charge rolling and hot direct rolling,in this paper,we investigated the technology of the width control rolling in the rougher mills of hot strip continuous rolling mill train.On the basis of improving width range of continuous casting of slab,we obtained a good result of greatly increasing the yield of slab→coil is achieved.

Role of Trunk Rehabilitation on Trunk Control, Balance and Gait in Patients with Chronic Stroke: A Pre-Post Design

Purpose: Although proximal stability of the trunk is a prerequisite for balance and gait, to determine the role of trunk rehabilitation on trunk control, balance and gait in patients with chronic stroke is yet unknown. Method: Fifteen sub-jects (post-stroke duration (3.53 ± 2.98) years) who had the ability to walk 10 meters independently with or without a walking aid;scoring ≤ 21 on Trunk Impairment Scale (TIS), participated in a selective trunk muscle exercise regime, consisting of 45 minutes training per day, four days a week, and for four weeks duration in an outpatient stroke reha-bilitation centre. Results: The overall effect size index for trunk rehabilitation was 1.07. This study showed large effect size index for Trunk Impairment Scale (1.75), Berg Balance Scale (1.65) than for gait variables (0.65). After trunk rehabilitation, there was a significant improvement for gait speed (p= 0.015), cadence (p= 0.001) and gait symmetry (p=0.019) in patients with chronic stroke. In addition, all the spatial gait parameters had a significant change post-intervention. There was no significant change in temporal gait parameters with the exception of affected single limb support time. The level of significance was set at p < 0.05. Conclusion: The exercises consisted of selective trunk movement of the upper and the lower part of trunk had shown larger effect size index for trunk control and balance than for gait in patients with chronic stroke. Future randomized controlled studies incorporating large sample size would provide insight into the effectiveness and clinical relevance of this intervention.

Exercise-induced muscle fatigue in the unaffected knee joint and its influence on postural control and lower limb kinematics in stroke patients

This study aimed to investigate the effects of exercise-induced muscle fatigue in the unaffected knee joint on postural control and kinematic changes in stroke patients. Forty participants（20 stroke patients, 20 age-matched healthy participants） were recruited. To induce fatigue, maximum voluntary isometric contractions were performed in the unaffected knee joint in a Leg Extension Rehab exercise machine using the pneumatic resistance. We measured static and dynamic balance and lower-limb kinematics during gait. Changes in postural control parameters anteroposterior sway speed and total center of pressure distance differed significantly between the stroke and control groups. In addition, changes in gait kinematic parameters knee and ankle angles of initial contact differed significantly between stroke（paretic and non-paretic） and control groups. Muscle fatigue in the unaffected knee and ankle impaired postural control and debilitates kinematic movement of ipsilateral and contralateral lower limbs, and may place the fatigued stroke patients at greater risk for falls.

Supported Rehabilitation for Individuals Who Have Experienced a Stroke: A Pilot Control Trial

The purpose of this study was to pilot an innovative and supported intervention for individuals with a stroke. A pilot control trial with qualitative interviews was undertaken within a university- community setting. Thirteen individuals who had experienced a stroke for periods of least 6 months (6 male, average 71 years) were assigned to the intervention group and 7 individuals (2 male, average age 67.9 years) assigned to the control group. Eight individuals from the intervention group completed a single interview. The procedures that related to recruitment and retention and data collection methods were considered. Outcome measures including;self-efficacy, falls self-efficacy and group membership, for both groups were taken at baseline, 11 weeks, 22 weeks. There was an additional assessment at 52 weeks for the intervention group. The structured interview was designed to focus on experiences of the intervention. Self-efficacy remained stable across time for both groups. An improvement in falls self-efficacy was noted in the intervention group at 11 weeks. Consistent improvement (from baseline) was observed in the identity scale across the 52 weeks. Qualitative data provided additional findings related to identity and confidence. Details considering recruitment and retention are also provided. This pilot study provided data that can be used for a further full-scale trial to be considered.

Reducing Participation Bias in Case-Control Studies: Type 1 Diabetes in Children and Stroke in Adults

Background: Case-control studies have been used extensively in determining the aetiology of rare diseases. However, case-control studies often suffer from participation bias in the control group, resulting in biased odds ratios that cause problems with interpretation. Participation bias can be hard to detect and is often ignored. Methods: Population data can be used in place of the possibly biased control group, to investigate whether participation bias may have affected the results in previous studies, or in place of controls in future studies. We demonstrate this approach by reanalysing and comparing the results of two case-control studies: Type 1 diabetes in Yorkshire children and stroke in Indian adults. Findings: Using population data to represent the control groups reduced the width of the confidence intervals given in the original studies and confirmed the findings for the two diabetes risk factors used;caesarean birth (odds ratio (OR) = 2.12 (1.53, 2.95) compared with 1.84 (1.09, 3.10)) and amniocentesis (OR = 3.38 (2.09, 5.47) compared with 3.85 (1.34, 11.04)). The three stroke risk factors investigated were found to have increased odds ratios when using population data;hypertension (OR = 5.645 (5.639, 5.650) compared with 3.807 (2.114, 6.856)), diabetes (OR = 12.212 (12.200, 12.224) compared with 3.473 (1.757, 6.866)) and smoking (OR = 5.701 (5.696, 5.707) compared with 2.242 (1.255, 4.005)). Interpretation: Participation bias can greatly affect the results of a study and cause some potential risk factors to be over-or underestimated. This approach allows previous studies to be investigated for participation bias and presents an alternative to a control group in future studies, while improving precision.

Early Application of Citicoline in the Treatment of Acute Stroke:A Meta-analysis of Randomized Controlled Trials

This study was to evaluate the efficacy and safety of early application of citicoline in the treatment of patients with acute stroke by meta-analysis. Randomized controlled trials published until May 2015 were electronically searched in MEDLINE, Embase, the Cochrane Central Register of Controlled Trials, WHO International Clinical Trial Registration Platform, Clinical Trial.gov, and China Biology Medicine disc. Two reviewers independently screened the articles and extracted the data based on the inclusion and exclusion criteria. The quality of included articles was evaluated by using Revman5.0, and meta-analysis was performed. The results showed that 1027 articles were obtained in initial retrieval, and finally 7 articles, involving a total of 4039 cases, were included for analysis. The meta-analysis showed that no significant differences were found in the long-term mortality（OR=0.91, 95% CI 0.07 to 1.09, P=0.30）, the rate of dependency（OR=1.02, 95% CI 0.87 to 1.24, P=0.85）, and the effective rate（OR=0.98, 95% CI 0.84 to 1.14, P=0.82） between citicoline group and control group. The overall rate of adverse events in citicoline group was not significantly different from that in control group（P=0.30）. The quality of included articles reached moderate-low level. In conclusion, citicolne cannot reduce long-term mortality and dependence rate in the treatment of acute stroke, and the effective rate of citivoline may be not better than that of controls but with reliable safety.

Frequency compensation control method for opposedpiston two-stroke folded-cranktrain engine's common rail system by loop-shaping theory

A frequency compensation control method for the opposed-piston two-stroke folded-cranktrain（ OPFC） diesel engine＇s common rail system is presented as a result of the study of the loop-shaping theory. A common rail working process and the classical frequency control theory are combined to construct a frequency restriction of common rail pressure. A frequency compensator is utilized to improve the robustness of multiplicative perturbations and disturbance. The loop-shaping method has been applied to design the common rail pressure controller of the OPFC diesel engine. Simulation and bench test results show that in the condition of perturbation that comes from the effect of injection,multi-injection,fuel pumping of a pre-cylinder,and instantaneous pressure fluctuation,the controller indicates high precision. Compared with the original controller,this method improves the control precision by 67. 3%.

全状态约束下长行程混联机器人投影迭代鲁棒控制算法

针对全状态约束下的长行程混联机器人系统鲁棒性较差提出了基于自适应学习神经网络和等效误差函数的投影迭代鲁棒控制算法。基于自适应学习神经网络逼近未知的非线性项,提出投影迭代鲁棒控制算法,更新网络权值并估计逼近误差和随机外部扰动的未知上界;构造用于抵消初始时刻随机变化扩展误差的时变边界层,设计基于时变边界层和扩展误差的等效误差函数作为迭代控制器的主要控制变量以克服随机初始误差满足相同初始条件;在控制器设计中引入正切型障碍Lyapunov函数,确保系统状态在预定范围内。仿真实验结果证明了该方法的有效性,可在全状态约束下实现高精度强鲁棒性的轨迹跟踪。

农用推杆电机行程控制算法研究

研究实现了一种农用推杆电机的低成本行程控制算法。该算法基于霍尔计数原理,通过给普通农用推杆电机加装2个霍尔传感器使得电机运行时输出2路方波信号来实现。电机运行时每转一圈会触发霍尔传感器输出一个脉冲信号,2路信号具有90°的相位差,通过2路信号的相位关系可判断出电机的正反转状态并据此对脉冲信号进行加数计数或减数计数,算法根据用户设置的行程百分比、霍尔计数值以及全行程霍尔计数总值实现电机行程的自动控制。该算法具有行程控制稳定可靠、实现成本低、适用于农业高湿多尘环境等优点,可应用于设施农业和大田农业中相关设备的现场自动控制以及基于农业物联网的远程精准控制。

肩部控制训练联合神经松动术对脑卒中偏瘫患者肩痛及上肢功能的效果

目的观察肩部控制训练基础上联合神经松动术治疗脑卒中偏瘫患者肩痛的效果。方法2020年1月至2021年11月,南通市第二人民医院脑卒中偏瘫患者43例,随机分为对照组(n=21)和治疗组(n=22)。对照组采用肩部控制训练,治疗组加用神经松动术。治疗前、治疗4周后,采用疼痛数字表法(NRS)和Fugl-Meyer评定量表上肢部分(FMA-UE)进行评定。结果对照组脱落1例,治疗组脱落2例。两组治疗后NRS和FMA-UE评分显著改善(|t|>7.898,P<0.001),且治疗组优于对照组(|t|>2.337,P<0.05)。结论肩部控制训练联合神经松动术能显著缓解脑卒中偏瘫患者的肩痛,改善其上肢运动功能。

基于C++的三维闪电回击数据再处理系统设计

针对三维闪电数据处理算法改进之后需重新定位回击数据,以及省级三维闪电探测系统的回击数据通常更加完整,应用时要将多个省份闪电回击数据合并后重新处理出准确的云内闪电高度值等问题,本研究使用C/S架构和C++builder编程开发了三维闪电回击数据再处理系统。系统设计了回击数据查询处理界面,提供了监视控制功能。通过设定回击数据文件和配置文件,再运行软件系统对符合条件的回击数据进行排序,在完成排序的数据中提取同一闪电相关信息,经计算处理得到重新定位的三维闪电探测结果并存储。将系统部署于国家级平台查询处理全国组网的三维闪电历史回击数据,测试结果表明,再处理系统操作便捷、功能齐全,满足三维闪电回击数据再处理系统的任务要求。

An Electro-Mechanical Controller for Adjusting Piston Pump Stroke On-the-Go for Site-Specific Application of Crop Nutrients

Nutrient application systems are designed to apply a relatively uniform amount of a fertilizer to agricultural fields. However, considerable variation in soil texture and other characteristics often occurs within and across production fields, which could have a major impact on fertilizer management strategies. Therefore, uniform application of a fertilizer over the entire field can be both costly and environmentally unsound. Due to their rugged and fool-proof design, crankshaft type piston pumps are widely used in agriculture. The on-the-go outlet flow of these pumps can only be varied by changing the drive shaft speed for each pump stroke setting. But only a limited range of flow rates can be achieved by changing the drive shaft speed. There is a need for an electronic controller, which can adjust the pump stroke on-the-go, for real-time, variable-rate application of crop nutrients. The Clemson “Electro-me-chanical controller for adjusting pump stroke on-the-go” was designed to replace the current manual stroke adjustment system on positive displacement piston pumps. This affordable system can be retrofitted on most John Blue - piston pumps for real-time adjustment of the pump stroke and can be controlled using pre-described position sequences (map-based) or real-time sensor commands (such as optical, pressure, and flow sensors) combined with fertilizer calculation algorithms. In addition, it can adjust pump stroke manually, using an eclectic dial from the tractor’s cab.

高精度液体注配料控制方法研究

为提高香精研发过程中配方试制精度,保证配方生产一致性,提出一种液体注配料控制方法。设计撞针行程可调节注料阀,通过常开和单点双模式注料以适应配料质量要求。常开模式采用顺馈+模糊PID控制;单点质量模式依据供给压力和撞针行程对单点质量的影响,建立单点质量控制模型。并分别进行仿真验证及模型优化。试验结果表明,当撞针行程和供给压力分别为0.1 mm和0.3 MPa时,单点质量为1.8 mg,配方试制过程中,常开控制偏差在5%以内,注料整体偏差在0.2%以内,重复精度<0.2%,满足实验室配方试制研发需求。研究对保证液体注配料精度具有重要意义。

山东省六市九医院脑卒中危险因素的病例对照研究

目的 探讨山东省六市九医院脑卒中患病的危险因素,比较半岛地区和内陆地区居民脑卒中患病危险因素的异同。方法 选取2022年12月至2023年10月在9所山东大学齐鲁医院康复医学专科联盟医院脑卒中患者作为病例组,以同时期在相关医院进行健康体检的人群作为对照组,两组研究对象样本数相同,按照年龄和性别进行匹配,并收集社会人口学信息和既往疾病史,分析脑卒中的危险因素。结果 最终纳入438例。居住在内陆(OR=2.07, 95%CI 1.26~3.40, P=0.04)、吸烟(P=0.007)、饮酒(OR=6.67,95%CI 1.16~38.37, P=0.019)、抑郁(OR=2.16, 95%CI 1.03~4.53, P=0.042)、高血压(OR=4.15, 95%CI2.34~7.39, P <0.001)是发生脑卒中的危险因素。对半岛和内陆居民进行分层分析,吸烟(OR=3.35,95%CI 1.11~10.10, P=0.013)和高血压(OR=2.79, 95%CI 1.12~6.95, P=0.004)是半岛地区居民脑卒中可能的危险因素,肥胖(腰围超标)(OR=1.08, 95%CI 1.03~1.13, P=0.001)、抑郁(OR=4.27, 95%CI 1.38~13.23,P=0.013)和高血压(OR=4.8, 95%CI 2.21~10.43, P <0.001)是内陆地区居民脑卒中可能的危险因素。结论 高血压是山东省六市九医院脑卒中患病最可能的危险因素,此外,居住在内陆、吸烟、饮酒也可能会使脑卒中的患病风险增加。半岛地区和内陆地区居民脑卒中可能的危险因素存在差异。

卒中医疗质量改进临床研究进展

以促进卒中指南推荐向临床实践转化应用为目标的卒中医疗质量改进成为应对全球卒中疾病负担的优先防控策略。本综述介绍了依托于学习型健康系统理念开展的多层面质量改进代表性研究、卒中再灌注治疗及时性的持续提升策略以及数字化时代背景下辅助卒中全流程质量管理的移动与远程医疗的应用。本文总结了目前卒中医疗质量改进领域的进展与潜在方向,以期为我国卒中医疗质量改进项目设计与开展、卒中医疗质量监测与改进体系建设提供借鉴。

品管圈护理模式在脑卒中患者中的应用研究进展

随着中国医疗护理体制改革的不断深化,社会对护理服务的期望与日俱增,护理工作需要持续不断的质量改进。目前,品管圈模式在中国已应用广泛,尤其是在医疗领域的质量管理方面,由于该模式是由基层员工自发组圈,并进行分工合作,责任到人,当其用于护理领域中时在快速解决临床护理工作中问题的同时还能加强团队之间的协作,提高团队的专业能力及综合素质,以达到提升工作质量、保障患者安全、促进患者康复、提高患者护理满意度的目的。该文对品管圈护理模式的概念、品管圈护理模式对脑卒中患者带来的作用,以及脑卒中患者品管圈护理模式应用现状进行了综述,分析了品管圈护理模式在脑卒中患者中存在的问题并提出建议,并对品管圈护理模式在脑卒中患者应用效果取得的有形成果和无形成果进行了总结,以期进一步提高品管圈护理模式对脑卒中患者的临床护理质量。

二冲程半直喷航空发动机喷油策略研究

基于自主研发的二冲程低压半直喷航空发动机及控制系统,开展喷油控制策略及对发动机性能影响规律的研究。结果表明:对于不同的发动机运行工况,需要采取不同的喷油策略组合。在起动和怠速工况,采用进气道喷射的独立供油方式;在部分负荷及高负荷工况,采用进气道喷射和缸内直喷协同供油方式,随着发动机直喷比例的提高,燃油消耗率相应减小;与采用进气道喷射供油相比较,采用低压半直喷供油可以获得较理想的燃油经济性。

豨莶通栓制剂联合西医常规疗法治疗急性缺血性脑卒中Meta分析

目的对豨莶通栓胶囊/丸治疗缺血性脑卒中的疗效进行系统评价。方法计算机检索中国知识资源总库(CNKI)、中国生物医学文献服务系统(SinoMed)、中文科技期刊数据库(VIP)、中国学术期刊数据库(Wanfang Data)、PubMed、Medline、Embase、Cochrane Library、Web of Science建库至2023年2月28日豨莶通栓制剂联合西医常规疗法治疗急性缺血性脑卒中相关文献,对可量化分析的研究作Meta分析,对有效率和其他疗效指标进行合并。结果共纳入7篇文献用于Meta分析。结果显示,西医常规疗法治疗急性缺血性脑卒中加用豨莶通栓胶囊/丸剂有效率(RR=0.34,95%CI[0.23,0.51],P<0.01)、美国国立卫生研究院卒中量表(NIHSS)评分(MD=-2.90,95%CI[-3.74,-2.06],P<0.01)、日常生活活动能力量表(BI)评分(MD=-10.08,95%CI[-13.47,-6.68],P<0.01)、纤维蛋白原(MD=-1.18,95%CI[-1.59,-0.77],P<0.01)差异有统计学意义,白细胞介素-6(MD=-15.4,95%CI[-33.3,2.49],P=0.09)差异无统计学意义。不同剂型和用药疗程对有效率和NIHSS评分的影响差异无统计学意义。结论联合使用豨莶通栓胶囊/丸可更好地改善急性缺血性脑卒中患者的NIHSS和BI评分,辅助患者的神经功能恢复,还可通过减少纤维蛋白原含量改善血液的高凝状态风险,且安全性良好。

“醒脑开窍”针刺法对老年卒中相关性肺炎发病影响的巢式病例对照研究

[目的]探讨真实环境下“醒脑开窍”针刺法对老年急性脑梗死(ACI)患者卒中相关性肺炎(SAP)发生率的影响。[方法]在ACI队列研究基础上,采用巢式病例对照研究方法,经倾向性匹配评分(PSM)均衡混杂因素,匹配因素包括美国国立卫生研究院卒中量表(NIHSS)以及吞咽困难,设置卡钳值为0.01,按照1∶4的比例进行匹配。随后利用Logistic回归分析针灸对老年SAP的发病影响,分析中医证型对SAP的发病影响及针灸对不同证型ACI患者SAP的发病影响。[结果]研究最终选取病例组48例、对照组155例患者进入研究,使用“醒脑开窍”针刺法后老年SAP发病风险降低76%(P<0.001)。多因素Logistic回归分析发现,在60~69、70~79、≥80岁年龄段中,“醒脑开窍”针刺法均是影响SAP发生的显著因素;“醒脑开窍”针刺法可以显著降低阴虚风动证ACI患者SAP的发病率[OR=0.12,95%CI(0.05,0.25),P<0.0001]。此外,无论ACI患者是否发生昏迷[基于格拉斯哥昏迷评分法(GCS)评分定义],“醒脑开窍”针刺法均可以减少SAP的发生。[结论]“醒脑开窍”针刺法可以降低ACI患者SAP的发生率,尤其是对阴虚风动证患者更为明显,预防效果尚需要进一步前瞻性研究加以证实。