目的探讨闭合式与开放式纤维板剥脱术治疗慢性结核性脓胸的临床疗效。方法回顾性分析2013年9月至2016年8月陕西省结核病防治院收治的经纤维板剥脱术治疗的74例慢性结核性脓胸患者的病例资料,按患者手术方式分为闭合组和开放组,每组各37...目的探讨闭合式与开放式纤维板剥脱术治疗慢性结核性脓胸的临床疗效。方法回顾性分析2013年9月至2016年8月陕西省结核病防治院收治的经纤维板剥脱术治疗的74例慢性结核性脓胸患者的病例资料,按患者手术方式分为闭合组和开放组,每组各37例。比较两组患者术中、术后指标变化,并于手术前、后评估肺功能变化,记录两组患者并发症发生情况。结果闭合组患者术中出血量(269. 36±45. 91 ml vs. 684. 85±43. 27 ml)、术后24 h引流量(437. 79±42. 87 ml vs. 678. 26±40. 06 ml)、引流管留置时间(6. 92±1. 81 d vs. 10. 34±1. 72 d)及住院时间(14. 68±2. 08 d vs. 21. 35±3. 12 d)均少于开放组。闭合组患者术后3个月、6个月、12个月的肺功能指标(FVC、FEV1、FEV1/FVC、MVV)均高于开放组(P <0. 05)。闭合组术后并发症发生率为10. 8%,明显低于开放组的29. 7%,两组比较差异具有统计学意义(P <0. 05)。结论闭合式纤维板剥脱术治疗慢性结核性脓胸能更为有效地减少术中出血量及引流量,缩短引流管留置时间及住院时间,并能在术后加速肺功能恢复,且可减少相关并发症发生。展开更多
现有的生物质成型机多采用开式压缩成型结构,存在能耗高、生产率低和对物料粒度要求严格等问题。文章以降低能耗、提高生产率和增强物料适应性为目标,设计了一种新型对辊式生物质压块机,该压块机通过对辊上相向旋转的椭圆形模具型腔,实...现有的生物质成型机多采用开式压缩成型结构,存在能耗高、生产率低和对物料粒度要求严格等问题。文章以降低能耗、提高生产率和增强物料适应性为目标,设计了一种新型对辊式生物质压块机,该压块机通过对辊上相向旋转的椭圆形模具型腔,实现物料的闭式压缩成型。整机采用分体机架三层式结构,通过一级螺旋压缩机、二级增压装置、三级对辊挤压装置组成的组合增压成型系统,可实现对物料的逐级压缩成型。通过脱模力计算,设计了可以提高对辊有效工作面积的椭圆形成型辊模具和增压辊人字形模具,并进行了受力分析。样机试验结果表明,样机的生产率为1 032.6 kg/h,能耗为38.8 k W·h/t、成型率为91.5%,各项指标均达到了农业行业标准(NT/T1882-2010)的要求。展开更多
BACKGROUND Gustilo III fractures have a high incidence and are difficult to treat.Patients often experience difficulty in wound healing.Negative pressure drainage technology can help shorten wound healing time and has...BACKGROUND Gustilo III fractures have a high incidence and are difficult to treat.Patients often experience difficulty in wound healing.Negative pressure drainage technology can help shorten wound healing time and has positive value in improving patient prognosis.AIM To explore the clinical value of the negative pressure sealing drainage technique in wound healing of Gustilo IIIB and IIIC open fractures.METHODS Eighty patients with Gustilo IIIB and IIIC open fractures with skin and soft tissue injuries who were treated in the Second People’s Hospital of Dalian from March 2019 to December 2021 were selected as the research subjects.They were divided into a study group(n=40,healed with negative pressure closed drainage)and a control group(n=40,healed with conventional dressing changes)according to the variation in the healing they received.The efficacy of the clinical interventions,the variations in the regression indicators(time to wound healing,time to fracture healing,time to hospitalization),and the conversion and healing of bacterial wounds were compared 1-3 mo after the intervention.RESULTS The total effective rate of patients among the study group was 95.00%(38/40),which was notably higher than 75.00%(30/40)among the control group(P<0.05).The wound healing time,fracture healing time,and hospital stay of the patients in the study group was shorter than the control group(P<0.05).After the intervention,the negative bacterial culture at the wound site rate and wound healing rate of the patients among the study group increased compared to the control group(P<0.05).CONCLUSION Negative pressure sealing and drainage technology has a good therapeutic effect on patients with Gustilo IIIB and IIIC open fracture wounds with skin and soft tissue injury.It can notably enhance the wound healing rate and the negative rate of bacteria on the wound surface and help to speed up the recovery process of patients.展开更多
This work proposes a novel proportional-derivative(PD)-type state-dependent Riccati equation(SDRE)approach with iterative learning control(ILC)augmentation.On the one hand,the PD-type control gains could adopt many us...This work proposes a novel proportional-derivative(PD)-type state-dependent Riccati equation(SDRE)approach with iterative learning control(ILC)augmentation.On the one hand,the PD-type control gains could adopt many useful available criteria and tools of conventional PD controllers.On the other hand,the SDRE adds nonlinear and optimality characteristics to the controller,i.e.,increasing the stability margins.These advantages with the ILC correction part deliver a precise control law with the capability of error reduction by learning.The SDRE provides a symmetric-positive-definite distributed nonlinear suboptimal gain K(x)for the control input law u=–R–1(x)BT(x)K(x)x.The sub-blocks of the overall gain R–1(x)BT(x)K(x),are not necessarily symmetric positive definite.A new design is proposed to transform the optimal gain into two symmetric-positive-definite gains like PD-type controllers as u=–KSP(x)e–KSD(x)?.The new form allows us to analytically prove the stability of the proposed learning-based controller for mechanical systems;and presents guaranteed uniform boundedness in finite-time between learning loops.The symmetric PD-type controller is also developed for the state-dependent differential Riccati equation(SDDRE)to manipulate the final time.The SDDRE expresses a differential equation with a final boundary condition,which imposes a constraint on time that could be used for finitetime control.So,the availability of PD-type finite-time control is an asset for enhancing the conventional classical linear controllers with this tool.The learning rules benefit from the gradient descent method for both regulation and tracking cases.One of the advantages of this approach is a guaranteed-stability even from the first loop of learning.A mechanical manipulator,as an illustrative example,was simulated for both regulation and tracking problems.Successful experimental validation was done to show the capability of the system in practice by the implementation of the proposed method on a variable-pitch rotor benchmark.展开更多
文摘目的探讨闭合式与开放式纤维板剥脱术治疗慢性结核性脓胸的临床疗效。方法回顾性分析2013年9月至2016年8月陕西省结核病防治院收治的经纤维板剥脱术治疗的74例慢性结核性脓胸患者的病例资料,按患者手术方式分为闭合组和开放组,每组各37例。比较两组患者术中、术后指标变化,并于手术前、后评估肺功能变化,记录两组患者并发症发生情况。结果闭合组患者术中出血量(269. 36±45. 91 ml vs. 684. 85±43. 27 ml)、术后24 h引流量(437. 79±42. 87 ml vs. 678. 26±40. 06 ml)、引流管留置时间(6. 92±1. 81 d vs. 10. 34±1. 72 d)及住院时间(14. 68±2. 08 d vs. 21. 35±3. 12 d)均少于开放组。闭合组患者术后3个月、6个月、12个月的肺功能指标(FVC、FEV1、FEV1/FVC、MVV)均高于开放组(P <0. 05)。闭合组术后并发症发生率为10. 8%,明显低于开放组的29. 7%,两组比较差异具有统计学意义(P <0. 05)。结论闭合式纤维板剥脱术治疗慢性结核性脓胸能更为有效地减少术中出血量及引流量,缩短引流管留置时间及住院时间,并能在术后加速肺功能恢复,且可减少相关并发症发生。
文摘现有的生物质成型机多采用开式压缩成型结构,存在能耗高、生产率低和对物料粒度要求严格等问题。文章以降低能耗、提高生产率和增强物料适应性为目标,设计了一种新型对辊式生物质压块机,该压块机通过对辊上相向旋转的椭圆形模具型腔,实现物料的闭式压缩成型。整机采用分体机架三层式结构,通过一级螺旋压缩机、二级增压装置、三级对辊挤压装置组成的组合增压成型系统,可实现对物料的逐级压缩成型。通过脱模力计算,设计了可以提高对辊有效工作面积的椭圆形成型辊模具和增压辊人字形模具,并进行了受力分析。样机试验结果表明,样机的生产率为1 032.6 kg/h,能耗为38.8 k W·h/t、成型率为91.5%,各项指标均达到了农业行业标准(NT/T1882-2010)的要求。
基金the Review Committee of Fuzhou Medical College of Nanchang University(Approval No.4445644).
文摘BACKGROUND Gustilo III fractures have a high incidence and are difficult to treat.Patients often experience difficulty in wound healing.Negative pressure drainage technology can help shorten wound healing time and has positive value in improving patient prognosis.AIM To explore the clinical value of the negative pressure sealing drainage technique in wound healing of Gustilo IIIB and IIIC open fractures.METHODS Eighty patients with Gustilo IIIB and IIIC open fractures with skin and soft tissue injuries who were treated in the Second People’s Hospital of Dalian from March 2019 to December 2021 were selected as the research subjects.They were divided into a study group(n=40,healed with negative pressure closed drainage)and a control group(n=40,healed with conventional dressing changes)according to the variation in the healing they received.The efficacy of the clinical interventions,the variations in the regression indicators(time to wound healing,time to fracture healing,time to hospitalization),and the conversion and healing of bacterial wounds were compared 1-3 mo after the intervention.RESULTS The total effective rate of patients among the study group was 95.00%(38/40),which was notably higher than 75.00%(30/40)among the control group(P<0.05).The wound healing time,fracture healing time,and hospital stay of the patients in the study group was shorter than the control group(P<0.05).After the intervention,the negative bacterial culture at the wound site rate and wound healing rate of the patients among the study group increased compared to the control group(P<0.05).CONCLUSION Negative pressure sealing and drainage technology has a good therapeutic effect on patients with Gustilo IIIB and IIIC open fracture wounds with skin and soft tissue injury.It can notably enhance the wound healing rate and the negative rate of bacteria on the wound surface and help to speed up the recovery process of patients.
基金supported by the European Commission H2020 Programme under HYFLIERS project contract 779411AERIAL-CORE project contract number 871479 and the ARTIC(RTI2018-102224-B-I00)projectfunded by the Spanish Agencia Estatal de Investigación。
文摘This work proposes a novel proportional-derivative(PD)-type state-dependent Riccati equation(SDRE)approach with iterative learning control(ILC)augmentation.On the one hand,the PD-type control gains could adopt many useful available criteria and tools of conventional PD controllers.On the other hand,the SDRE adds nonlinear and optimality characteristics to the controller,i.e.,increasing the stability margins.These advantages with the ILC correction part deliver a precise control law with the capability of error reduction by learning.The SDRE provides a symmetric-positive-definite distributed nonlinear suboptimal gain K(x)for the control input law u=–R–1(x)BT(x)K(x)x.The sub-blocks of the overall gain R–1(x)BT(x)K(x),are not necessarily symmetric positive definite.A new design is proposed to transform the optimal gain into two symmetric-positive-definite gains like PD-type controllers as u=–KSP(x)e–KSD(x)?.The new form allows us to analytically prove the stability of the proposed learning-based controller for mechanical systems;and presents guaranteed uniform boundedness in finite-time between learning loops.The symmetric PD-type controller is also developed for the state-dependent differential Riccati equation(SDDRE)to manipulate the final time.The SDDRE expresses a differential equation with a final boundary condition,which imposes a constraint on time that could be used for finitetime control.So,the availability of PD-type finite-time control is an asset for enhancing the conventional classical linear controllers with this tool.The learning rules benefit from the gradient descent method for both regulation and tracking cases.One of the advantages of this approach is a guaranteed-stability even from the first loop of learning.A mechanical manipulator,as an illustrative example,was simulated for both regulation and tracking problems.Successful experimental validation was done to show the capability of the system in practice by the implementation of the proposed method on a variable-pitch rotor benchmark.
