Left ventricular assist device (LVAD) is being used increasingly in recent years for end stage heart failure as a bridge to transplant (BTT) and also as a destination therapy (DT). Patients with end stage heart failur...Left ventricular assist device (LVAD) is being used increasingly in recent years for end stage heart failure as a bridge to transplant (BTT) and also as a destination therapy (DT). Patients with end stage heart failure have some degree of elevated pulmonary capillary wedge pressure, causing right ventricular hypertrophy which in due course leads to decreased dilatation of the RV and fall in cardiac output & severe tricuspid regurgitation (TR) presenting with features of RV failure (RVF). Implantation of LVAD improves left heart function at the cost of right ventricular output with an incidence of 25%-30%. RVF may lead to impaired LVAD flow, difficulty in weaning from cardio-pulmonary bypass (CPB), decreased tissue perfusion and multi-organ failure. In this article we comprehended the pathophysiology leading to RVF post LVAD implantation and its preoperative predictors and the various treatment modalities for managing RVF post LVAD implantation.展开更多
文章先是阐述了能见度值在飞行指挥工作中的重要性,从能见度设备的测量原理上描述了飞虫类等对能见度测量值的影响。结合TR30LED大气透射仪的组成结构,深入分析飞虫、飞鸟活动如何导致其测量值异常变化,列举了对此类影响的各项常规防控...文章先是阐述了能见度值在飞行指挥工作中的重要性,从能见度设备的测量原理上描述了飞虫类等对能见度测量值的影响。结合TR30LED大气透射仪的组成结构,深入分析飞虫、飞鸟活动如何导致其测量值异常变化,列举了对此类影响的各项常规防控手段和措施,并通过设计开发技防措施和装置来进行防控,对TR30LED大气透射仪的飞虫飞鸟影响起到了积极的防护作用。This article first elaborates on the importance of visibility values in flight command work, and describes the impact of flying insects and other factors on visibility measurement values from the measurement principle of visibility equipment. Based on the composition and structure of the TR30LED atmospheric transmittance meter, this article deeply analyzes how the activities of flying insects and birds cause abnormal changes in their measurement values. Various conventional prevention and control measures for such effects are listed, and technical prevention measures and devices are designed and developed to prevent and control the impact of flying insects and birds on the TR30LED atmospheric transmittance meter, playing a positive protective role.展开更多
The limit of translatability is closely related to translation aesthetics since faithful reproduction of the source text's aes thetic elements in target text is by no means an easy task or even a laborious but fru...The limit of translatability is closely related to translation aesthetics since faithful reproduction of the source text's aes thetic elements in target text is by no means an easy task or even a laborious but fruitless task.Some aesthetic elements of the source text can not be represented in target language due to linguistic and cultural divergences or translator's incompetence.In that case,there is limit of translatability from the perspective of translation aesthetics.展开更多
This paper deals with the effects of codoped VC/Cr3C2 and sintering temperature on the magnetic and mechanical properties of ultra-fine grained WC-12%Co alloys. Results show that the synergistic action of doped VC/Cr3...This paper deals with the effects of codoped VC/Cr3C2 and sintering temperature on the magnetic and mechanical properties of ultra-fine grained WC-12%Co alloys. Results show that the synergistic action of doped VC/Cr3C2 in optimal proportion enhances both the hardness and transverse rupture strength （TRS） of the alloys, with more homogeneous microstructtLre. When the alloy is sintered at 1430℃ and with 0.5% Cr3C2/0.2% VC, the TRS reaches 3786 MPa, the hardness is 91.7 HRA and the grain size smaller than 0.6 μm. The numerical analyses on grain growth during the sintering process show that both VC precipitating on the WC grain boundary and Cr3C2 dissolving in the Co phase decrease the solid/liquid interfacial energy γ, the process of dissolution and reprecipitation is greatly retarded and the coarsening of WC grains is inhibited.展开更多
文摘Left ventricular assist device (LVAD) is being used increasingly in recent years for end stage heart failure as a bridge to transplant (BTT) and also as a destination therapy (DT). Patients with end stage heart failure have some degree of elevated pulmonary capillary wedge pressure, causing right ventricular hypertrophy which in due course leads to decreased dilatation of the RV and fall in cardiac output & severe tricuspid regurgitation (TR) presenting with features of RV failure (RVF). Implantation of LVAD improves left heart function at the cost of right ventricular output with an incidence of 25%-30%. RVF may lead to impaired LVAD flow, difficulty in weaning from cardio-pulmonary bypass (CPB), decreased tissue perfusion and multi-organ failure. In this article we comprehended the pathophysiology leading to RVF post LVAD implantation and its preoperative predictors and the various treatment modalities for managing RVF post LVAD implantation.
文摘文章先是阐述了能见度值在飞行指挥工作中的重要性,从能见度设备的测量原理上描述了飞虫类等对能见度测量值的影响。结合TR30LED大气透射仪的组成结构,深入分析飞虫、飞鸟活动如何导致其测量值异常变化,列举了对此类影响的各项常规防控手段和措施,并通过设计开发技防措施和装置来进行防控,对TR30LED大气透射仪的飞虫飞鸟影响起到了积极的防护作用。This article first elaborates on the importance of visibility values in flight command work, and describes the impact of flying insects and other factors on visibility measurement values from the measurement principle of visibility equipment. Based on the composition and structure of the TR30LED atmospheric transmittance meter, this article deeply analyzes how the activities of flying insects and birds cause abnormal changes in their measurement values. Various conventional prevention and control measures for such effects are listed, and technical prevention measures and devices are designed and developed to prevent and control the impact of flying insects and birds on the TR30LED atmospheric transmittance meter, playing a positive protective role.
文摘The limit of translatability is closely related to translation aesthetics since faithful reproduction of the source text's aes thetic elements in target text is by no means an easy task or even a laborious but fruitless task.Some aesthetic elements of the source text can not be represented in target language due to linguistic and cultural divergences or translator's incompetence.In that case,there is limit of translatability from the perspective of translation aesthetics.
基金the National Natural Science Foundation of China (No. 50372043).
文摘This paper deals with the effects of codoped VC/Cr3C2 and sintering temperature on the magnetic and mechanical properties of ultra-fine grained WC-12%Co alloys. Results show that the synergistic action of doped VC/Cr3C2 in optimal proportion enhances both the hardness and transverse rupture strength （TRS） of the alloys, with more homogeneous microstructtLre. When the alloy is sintered at 1430℃ and with 0.5% Cr3C2/0.2% VC, the TRS reaches 3786 MPa, the hardness is 91.7 HRA and the grain size smaller than 0.6 μm. The numerical analyses on grain growth during the sintering process show that both VC precipitating on the WC grain boundary and Cr3C2 dissolving in the Co phase decrease the solid/liquid interfacial energy γ, the process of dissolution and reprecipitation is greatly retarded and the coarsening of WC grains is inhibited.
