Coronary ostial stenosis after surgical aortic valve replacement (SAVR) is a rare but potentially fatal complication. Surgeons must have a high level of vigilance regarding the presentation of acute myocardial ischemi...Coronary ostial stenosis after surgical aortic valve replacement (SAVR) is a rare but potentially fatal complication. Surgeons must have a high level of vigilance regarding the presentation of acute myocardial ischemia, arrhythmia, and heart failure after AVR. According to most reports, this event can be time-dependent divided into two groups;early acute phase that mostly happens intraoperative during weaning of CPB or in early ICU stay, and late presentation usually appears 1 - 6 months post surgery. Here, we describe an unusual subacute presentation of right coronary ostial stenosis 12 days after SAVR, which was treated successfully with redo beating heart coronary artery bypass grafting (CABG).展开更多
Transition from non-surgical heart valve defects repair from bench to bedside is a reality.Some biological material-based designs for transcatheter aortic valve implantation are ready for use.Their drawback,however is...Transition from non-surgical heart valve defects repair from bench to bedside is a reality.Some biological material-based designs for transcatheter aortic valve implantation are ready for use.Their drawback,however is their unknown functional as well as structural durability.Moreover,research on new non-biological materials is essential to replace classical animal-derived sources of human heart valve prostheses.展开更多
High speed digital valves are devices ideally suited for the direct interface of fluid power components to digital computers due to their on/off characteristics. In this paper, a model of an extra high speed digital v...High speed digital valves are devices ideally suited for the direct interface of fluid power components to digital computers due to their on/off characteristics. In this paper, a model of an extra high speed digital valve applied in fuel injection system was presented. In order to get the ability of fast response and a simple construction, a new concept for designing and predicting the valve was presented herewith. A new predicting simulation model of the entire test stand was utilized in order to parameterize the model against measured data. The new model predicts transient valve behavior and the proper dynamic coupling between the electrical, magnetic, mechanical and fluid subsystems. Based on the model and simulation, a prototype valve with working pressure of 120 MPa and frequency of 2 kHz was designed and fabricated, its experimental and prediction results for armature motion show excellent agreement.展开更多
本文提出了一种新型高带宽密度、低功耗的面向片上(Die to Die,D2D)互连的7阶相关非归零(Non-Return-to-Zero,NRZ)编码接口电路结构.为了进一步提高5阶相关NRZ编码在D2D互连中的信噪比和带宽密度,设计了基于发射矩阵和接收矩阵的编解码...本文提出了一种新型高带宽密度、低功耗的面向片上(Die to Die,D2D)互连的7阶相关非归零(Non-Return-to-Zero,NRZ)编码接口电路结构.为了进一步提高5阶相关NRZ编码在D2D互连中的信噪比和带宽密度,设计了基于发射矩阵和接收矩阵的编解码电路.基于发射矩阵,在发射端设计了基于电压模驱动的编码电路,有效降低了功耗;基于接收矩阵,在接收端设计了基于有源可调电感的解码均衡电路,提高了通信速率.同时,为了解决接收端时钟偏斜问题,还设计了误码校准电路.该接口电路采用28 nm CMOS(Complementary Metal Oxide Semiconductor)工艺设计,核心面积为3 mm^(2),可适用于10~50 mm的片上互连.后端仿真结果表明,在奈奎斯特频率为20 GHz、信道插损为-8 d B的条件下,接收端最窄眼宽为0.45 UI,误码率小于10^(-15),能耗效率为1.2 p J/b,带宽密度为448 Gbps/mm.展开更多
文摘Coronary ostial stenosis after surgical aortic valve replacement (SAVR) is a rare but potentially fatal complication. Surgeons must have a high level of vigilance regarding the presentation of acute myocardial ischemia, arrhythmia, and heart failure after AVR. According to most reports, this event can be time-dependent divided into two groups;early acute phase that mostly happens intraoperative during weaning of CPB or in early ICU stay, and late presentation usually appears 1 - 6 months post surgery. Here, we describe an unusual subacute presentation of right coronary ostial stenosis 12 days after SAVR, which was treated successfully with redo beating heart coronary artery bypass grafting (CABG).
基金Supported by IKEM Research Grant G973 (research project No.#000233001 awarded by the Ministry of Health,CZ)
文摘Transition from non-surgical heart valve defects repair from bench to bedside is a reality.Some biological material-based designs for transcatheter aortic valve implantation are ready for use.Their drawback,however is their unknown functional as well as structural durability.Moreover,research on new non-biological materials is essential to replace classical animal-derived sources of human heart valve prostheses.
文摘High speed digital valves are devices ideally suited for the direct interface of fluid power components to digital computers due to their on/off characteristics. In this paper, a model of an extra high speed digital valve applied in fuel injection system was presented. In order to get the ability of fast response and a simple construction, a new concept for designing and predicting the valve was presented herewith. A new predicting simulation model of the entire test stand was utilized in order to parameterize the model against measured data. The new model predicts transient valve behavior and the proper dynamic coupling between the electrical, magnetic, mechanical and fluid subsystems. Based on the model and simulation, a prototype valve with working pressure of 120 MPa and frequency of 2 kHz was designed and fabricated, its experimental and prediction results for armature motion show excellent agreement.
文摘本文提出了一种新型高带宽密度、低功耗的面向片上(Die to Die,D2D)互连的7阶相关非归零(Non-Return-to-Zero,NRZ)编码接口电路结构.为了进一步提高5阶相关NRZ编码在D2D互连中的信噪比和带宽密度,设计了基于发射矩阵和接收矩阵的编解码电路.基于发射矩阵,在发射端设计了基于电压模驱动的编码电路,有效降低了功耗;基于接收矩阵,在接收端设计了基于有源可调电感的解码均衡电路,提高了通信速率.同时,为了解决接收端时钟偏斜问题,还设计了误码校准电路.该接口电路采用28 nm CMOS(Complementary Metal Oxide Semiconductor)工艺设计,核心面积为3 mm^(2),可适用于10~50 mm的片上互连.后端仿真结果表明,在奈奎斯特频率为20 GHz、信道插损为-8 d B的条件下,接收端最窄眼宽为0.45 UI,误码率小于10^(-15),能耗效率为1.2 p J/b,带宽密度为448 Gbps/mm.
