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.

Investigation into the Independent Metering Control Performance of a Twin Spools Valve with Switching Technology-controlled Pilot Stage

In hydraulic area,independent metering control(IMC)technology is an effective approach to improve system efficiency and control flexibility.In addition,digital hydraulic technology(DHT)has been verified as a reasonable method to optimize system dynamic performance.Integrating these two technologies into one component can combine their advantages together.However,few works focused on it.In this paper,a twin spools valve with switching technologycontrolled pilot stage(TSVSP)is presented,which applied DHT into its pilot stage while appending IMC into its main stage.Based on this prototype valve,a series of numerical and experiment analysis of its IMC performance with both simulated load and excavator boom cylinder are carried out.Results showed fast and robust performance of pressure and flow compound control with acceptable fluctuation phenomenon caused by switching technology.Rising time of flow response in excavator cylinder can be controlled within 200 ms,meanwhile,the recovery time of rod chamber pressure under suddenly changed condition is optimized within 250 ms.IMC system based on TSVSP can improve both dynamic performance and robust characteristics of the target actuator so it is practical in valve-cylinder system and can be applied in mobile machineries.

Biodegradable stent or balloon dilatation for benign oesophageal stricture: Pilot randomised controlled trial

AIM:To undertake a randomised pilot study comparing biodegradable stents and endoscopic dilatation in patients with strictures.METHODS:This British multi-site study recruitedseventeen symptomatic adult patients with refractory strictures.Patients were randomisedus in gamulticentre,blinded assessor design,comparing a biodegradable stent(BS)with endoscopic dilatation(ED).The primary endpoint was the average dysphagia score during the first 6 mo.Secondary endpoints included repeat endoscopic procedures,quality of life,and adverse events.Secondary analysis included follow-up to 12 mo.Sensitivity analyses explored alternative estimation methods for dysphagia and multiple imputation of missing values.Nonparametric tests were used.RESULTS:Although both groups improved,the average dysphagia scores for patients receiving stents were higher after 6 mo:BS-ED 1.17(95%CI:0.63-1.78)P=0.029.The finding was robust under different estimation methods.Use of additional endoscopic procedures and quality of life(QALY)estimates were similar for BS and ED patients at 6 and12 mo.Concomitant use of gastrointestinal prescribed medication was greater in the stent group(BS 5.1,ED 2.0 prescriptions;P<0.001),as were related adverse events(BS 1.4,ED 0.0 events;P=0.024).Groups were comparable at baseline and findings were statistically significant but numbers were small due to under-recruitment.The oesophageal tract has somatic sensitivity and the process of the stent dissolving,possibly unevenly,might promote discomfort or reflux.CONCLUSION:Stenting was associated with greater dysphgia,co-medication and adverse events.Rigorously conducted and adequately powered trials are needed before widespread adoption of this technology.

基于位置分配的去蜂窝massive MIMO系统导频分配功率控制算法

针对去蜂窝(cell free,CF)大规模多输入多输出(multiple-input multiple-output,MIMO)系统中存在严重的导频污染问题,提出了一种基于位置分配的贪婪导频分配功率控制算法(greedy pilot assignment based on location with pilot power control,GPABL with PPC).首先,遵循相邻用户不分配相同导频序列的原则进行贪婪导频分配(greedy pilot assignment,GPA);然后,在导频分配的基础上叠加了导频功率控制,选择合理的导频功率控制系数减小信道估计的均方误差.仿真结果表明,将两种方式结合起来进行导频优化,系统的吞吐能力有所提升.

自动飞行员复诵指令生成方法研究

为了提高效率,降低培训成本并推广使用计算机来取代管制模拟机中的飞行员席位,采用集成学习的策略来生成飞行员复诵指令。选用5个大规模预训练语言模型进行微调,并使用K折交叉验证来筛选出性能较好的4个模型作为基础模型来构建集成学习模型。所构建的集成学习模型在管制指令数据集上取得在本领域中的最优效果。在通用的ROUGE(recall-oriented understudy for gisting evaluation)评价标准中,取得R_(OUGE-1)=0.998,R_(OUGE-2)=0.995,R_(OUGE-L)=0.998的最新效果。其中,R_(OUGE-1)关注参考文本与生成文本之间单个单词的匹配度,R_(OUGE-2)则关注两个连续单词的匹配度,R_(OUGE-L)则关注最长公共子序列的匹配度。为了克服通用指标在本领域的局限性,更准确地评估模型性能,针对生成的复诵指令提出一套基于关键词的评价标准。该评价指标准基于管制文本分词后的结果计算各个关键词指标来评估模型的效果。在基于关键词的评价标准下,所构建模型取得整体准确率为0.987的最优效果,对航空器呼号的复诵准确率达到0.998。

果园履带车自动导航自适应控制方法

为提高果园履带车自动导航精度和稳定性,兼顾成本和作业效率,提出一种基于模糊控制的自适应导航控制决策方法,并设计开发了一种自动导航嵌入式控制系统。首先,对果园履带车自动导航控制系统整体架构进行设计;其次,确定各关键子系统硬件和软件结构;再次,基于模糊控制与传统PID控制方法研究自适应导航控制决策方法,并基于MatLab/Simulink平台进行建模仿真;最后,将自动导航自适应嵌入式控制系统应用于果园履带车上进行性能评估,以及自适应控制和传统控制两种模式下的果园履带车自动导航过程对比试验。仿真结果表明:模糊PID控制方法的上升时间、超调量和稳态误差分别为0.17s、4.02%和±0.15%,相较于传统控制方法分别优化了5.88%、41.31%和34.78%。验证试验表明:自适应控制方式下果园履带车自动导航的横向偏差和纵向偏差平均值分别为6.24、9.65cm,相比于传统控制方式偏差平均值分别减小了33.97%和12.67%。所提出的果园履带车自动导航自适应控制方法和设计的嵌入式控制系统,不仅能够实现果园履带车自动导航过程的自适应调整,而且提高了自动导航的精度,保证了行驶的稳定性,可为果园履带车实际生产操作提供参考。

国家试点与中医医院资源增长:基于中医药综合改革试验区的检验

目的:立足“国家中医药综合改革试验区”这一试点政策,从南阳市中医医院视角,对试验区建设效果进行评价。方法:将中部地区26个地级市纳入对照组,构建2010年至2019年相关时间的面板数据,以南阳市2017年开始试验区建设为准自然实验,运用高效合成控制方法检验政策效果及其稳健性。结果:围绕卫生服务资源增长,研究发现,南阳市中医医院的实有床位数与卫生技术人员在试点开始后有了明显增长,实有床位数在政策干预以来平均每年增长约1648张,卫生技术人员平均每年增加约700人,经过稳健性检验后依然成立。结论:试点政策有效,人才发展与组织保障对试点政策平稳运行有重要意义,启示政府部门重视人力资源的引进,并且根据试点政策特点,在组织设计层面予以有效的保障。

椭圆形高层建筑物主体施工测量方法

在现代化城市建设过程中,高层建筑的数量越来越多,建筑外观曲线也丰富多变,建筑物主体施工测量也宜适应新需求。目前普遍采用传统的椭圆曲线放大样测设方法,虽描点少,计算简单,但存在曲线契合度较低、曲线不够圆润、测设精度较低等问题。本文提出了椭圆曲线直角坐标测设方法。该方法利用椭圆的双轴对称性,结合直角坐标定点、系列关键点定曲线原理;通过计算椭圆曲线上关键点的直角坐标,利用直角坐标描绘出关键点,不需要面积较大的平整场地,可获得契合度高、平滑美观的椭圆曲线,且测量精度满足规范要求。结合工程实例,验证了本文方法的有效性、适用性。

双阀芯先导笼式调节阀的设计仿真与试验

为解决高温高压工况下调节阀的不平衡力及密封力难以达到所需泄漏等级的问题,设计了一种大阀芯和小阀芯分段配合工作、充分利用阀前介质压力增加阀座密封力的双阀芯先导笼式调节阀。文中给出了调节阀的不平衡力计算公式、流量方程,分析了其流量特性,并对阀内流体的流动进行了仿真,分析了流体流过调节阀后的压力损失;对大阀芯内腔进行了流体流动仿真,分析了阀前压力、内腔温度以及密封力的变化;对大、小阀芯进行了运动仿真,分析了执行器驱动力、阀芯轴向合力和大阀芯速度的变化。常温介质阀体耐压试验和阀座泄漏量试验结果表明,阀体均无可见泄漏和变形,泄漏量设定为10滴/min时,3次实测泄漏量分别为1、1和2滴/min。高温介质阀座泄漏量试验结果表明,泄漏量设定为1.275 mL/min时,250℃高温水蒸气的3次实测泄漏量分别为0.11、0.11和0.13 mL/min,300℃高温水蒸气的3次实测泄漏量分别为0.19、0.19和0.22 mL/min,实测泄漏量均小于设定值。文中提出的双阀芯先导笼式结构增强了调节阀的密封力,阀体耐压强度和阀座密封性能均满足使用要求。

遥控驾驶航空器系统应用研究

近年来,随着无人系统技术的快速发展以及航空业市场的逐步扩大,遥控驾驶航空器系统作为民用航空中的一个新领域正在迅速崛起。遥控驾驶航空器系统不仅为航空行业带来了新的机遇和潜在经济价值,同时对所需技术提出了挑战。本文首先针对遥控驾驶航空器的运行概念和应用场景进行分析,对其关键技术进行研究并提出相关技术现阶段存在的问题和解决方法,最后对实现未来遥控驾驶航空器系统安全、高效融入有人机空域中提供了建议参考。

国家生态文明试验区建设对农业碳排放强度的影响——基于30个省份面板数据的准自然实验

从生态文明理论构建到生态文明试验区的建设,中国生态文明逐步从理论构建迈向实践探索。农业产量增长与降低碳排放强度是生态文明建设的新挑战。论文利用合成控制法和合成双重差分法,基于2001—2020年中国30个省份的面板数据,分析2016年以来国家级生态文明试验区的设立和建设对试验区农业碳排放强度的影响。研究发现:(1)在国家生态文明试验区建设开始之后,试验区的农业碳排放强度降低成效总体优于中国其他地区,对于实现“双碳”目标有重要的促进作用;(2)合成控制法研究结果表明,国家生态文明试验区对于农业碳排放强度降低的政策效应具有政策的时滞性和区域差异性,在不同地区呈现出不同的政策效应;(3)合成双重差分研究结果表明,生态文明试验区的设立对贵州农业碳排放强度降低呈现出“强有效”的政策效应,福建呈现出“部分有效”,而江西则呈现出“弱有效”。基于分析结论,最后从生态文明试验区政策的推广和实施等方面提出对策建议,以期推动中国生态文明建设进一步发展,助力“双碳”目标的实现。

新型水性丙烯酸二级分散体中试工艺及性能研究

通过粒径分布、FTIR和分子量等分析对新型水性丙烯酸二级分散体进行了表征,并从中试关键工艺、水性丙烯酸二级分散体性能及涂膜性能等3方面对新型水性丙烯酸二级分散体的中试工艺及性能进行了研究。结果表明,中试水性丙烯酸二级分散体的粒径均比小试的大;小试、中试水性丙烯酸二级分散体的FTIR图谱基本一致,均为苯丙型丙烯酸树脂水分散体;第2次中试的水性丙烯酸二级分散体的性能指标基本接近小试的测试结果;中试水性丙烯酸二级分散体制漆后,干性和耐水性均较小试下降;粒径和分子量是影响水性丙烯酸二级分散体的主要因素,中试的初始导热油温度应控制在130~135℃,以保证较小的粒径和较大的分子量。

局域网在中试试验装置控制系统的应用

详细介绍了中海油材科院如何利用局域网解决中试试验装置分散控制的难题。通过建立局域网,将不同品牌控制系统和通信方式集中融合到一个中心控制室,成功解决了分散监控的问题,并提高了自动化控制水平。局域网的成功应用对小规模、多台套中试试验装置及实验室设备实现集中控制、信息共享具有极好的推广和借鉴意义。

基于四旋翼无人机集群协同编队飞行的控制策略转换研究

在目前无人机协同编队飞行的研究中,主要采用领航-跟随结构法的主从控制策略;但是在实际工况中一旦主无人机发生损毁,则编队飞行就会无法实现。基于上述情况,建立了四旋翼无人机动力学模型,使用数值仿真对四旋翼无人机协同编队飞行策略的转换进行了研究。首先,通过四旋翼无人机采用领航-跟随结构法进行了集群协同编队飞行时的模型建立并且进行相关仿真。其次由于该结构法存在鲁棒性差,较为依赖信号稳定性且同时存在主无人机损毁的风险;因此研究了四旋翼无人机采用交叉耦合结构法进行集群协同编队飞行时的模型并且进行了相关的仿真,验证了其可行性。最后为了加强四旋翼无人机协同编队时的稳定性,研究了在飞行过程中两种不同的飞行策略进行转换的协同控制器并且进行了仿真验证了其可行性。

先导式低压节能栓塞输灰系统智能控制平台在660 MW机组中的应用研究

从660MW火电机组输灰系统的程序控制存在的问题入手,解决机组负荷运行时存在变量较大及灰斗灰量与输灰系统的关联问题,智能控制输灰系统的启停,并探讨先导式低压节能栓塞输灰系统的低压工作原理,配合智能控制平台进行智能控制空压机的启停,同时分析改造后产生的经济效益。

绿色金融改革创新试点政策能促进能源消费结构优化吗?

为进一步推动我国绿色金融发展,2017年国务院批准设立绿色金融改革创新试验区。本文选取2013—2020年我国30个省级行政区宏观面板数据为研究对象,采用合成控制法分析绿色金融改革创新试点政策对能源消费结构的影响。研究表明,绿色金融改革创新试点政策能够促进能源消费结构的优化。机制分析发现,绿色金融改革创新试点政策通过促进地区融资规模的扩张对能源消费结构产生正向影响。本文为更好地发挥绿色金融改革创新试点政策的作用以及促进地区能源消费结构的优化具有实践指导意义。

基于合成控制模型的广东省跨境电商政策效应评价研究

本文以广东省佛山、珠海、东莞、汕头构建实验组,并以2019年为政策干预期,利用合成控制法对广东省四市的跨境电商综试区政策效应进行分析。结果显示:从跨境电商综试区政策效应方面看,佛山及珠海在广东省跨境电商综试区政策出台后,对跨境电商行业产出水平方面具有显著的提升作用;从政策效应的城市差异层面看,广东省跨境电商综试区政策出台后对地理位置、产业基础及资源禀赋具有优势的城市促进作用最为显著,而对上述优势不明显的城市促进效果不显著。

Testing the feasibility and effects of a self-management support intervention for patients with cancer and their family caregivers to reduce pain and related symptoms (ANtiPain): Study protocol of a pilot study

Despite effective treatment options, more than 40% of cancer patients receive inadequate pain management. Our previous pilot study resulted in substantial adaptations of a cancer pain self-management intervention, the German PRO-Self? Plus Pain Control Program originally developed in the United States. This program will be implemented into clinical practice at the Medical Center-University of Freiburg. The purpose of this multiple methods pilot study is to test the implementation regarding feasibility and effects in clinical practice. In a randomized, wait-list controlled pilot study, adult oncology in-patients of a palliative care consultation service with pain >3/10 will be recruited. The intervention will be performed by a specialized advanced practice nurse with an in-hospital visit and, after discharge, via phone calls and visits. The follow-up will be personalized according to a clinical algorithm that factors in pain intensity, satisfaction with pain management, and patient adherence. The intervention includes structured and tailored components and is based on three key strategies: information, skill building and nurse coaching. The specific aims of this study are threefold: 1) to test the feasibility of the study and intervention procedures;2) to establish effect sizes of main outcome variables (e.g. decrease pain intensity, reduce the number of patients with pain as main symptom) for subsequent power calculation;3) to explore participants’ experiences with pain self-management support and their view of burden and benefit from study participation in a qualitative substudy. During the study period, which includes three data collection time points (T0 before, T1 one week and T2 six weeks after discharge), data will be collected via field notes of study nurses and questionnaires of patients. The results of this pilot study will build the basis for a larger comparative effectiveness study in which long term outcomes of a cancer pain self-management intervention in clinical practice will be evaluated.

基于嵌入式S3C6410的采摘机器人自动导航控制系统

首先,介绍了采摘机器人自动导航系统的整体框架,搭建了采摘机器人自动导航车辆硬件平台;然后,建立了采摘机器人自动导航系统运动学模型;最后,设计了模糊控制的调向控制策略,实现了基于S3C6410的采摘机器人自动导航控制系统。MatLab仿真试验与结果表明:系统响应速度快,超调较小,具有较好的稳定性,能够满足农田作业的精度要求。

碳交易试点政策对区域制造业绿色化发展的影响研究——基于试点省市的准自然实验分析

基于2008—2019年碳交易试点地区的面板数据,采用合成控制法评估政策实施对试点地区制造业绿色化发展水平的影响,并进一步比较与非试点地区存在的差异。研究发现,碳交易机制对区域制造业绿色化发展具有显著的促进效应,除上海呈现反向效应外,北京、天津、广东、湖北和重庆制造业绿色化发展水平在碳交易试点期间得到显著提升,存在可持续影响机制;碳交易试点政策通过引导技术创新发挥中介效应,进而促进区域制造业绿色化发展水平提升。认为政府应加快完善碳交易市场推广试点经验,建设全国统一的碳排放权交易市场,鼓励制造业企业主动融入“双碳”战略并实现数字化技术创新,以促进绿色转型。