MULTIFACTORIAL ASSESSMENT OF POSTMORTEM LUNG DONOR

The appropriate evaluation and the development of special measures to protect donor lungs are important factors for successful lung transplantation. Aim. To develop and determine the effectiveness of the protocol of morpho- functional assessment of potential lung donor. Methods and results. During the period from May, 2011 to May, 2012, 37 donors with diagnoses of brain death were surveyed. 5 bilateral lung transplantations were performed only in 2 cases donors have been evaluated as «ideal». In the majority of recipients early postoperative period was evaluated as satisfactory. Conclusion. Designed multivariate algorithm of donor with brain death assess- ment, effectively implemented through the selection of donors for lung transplantation with satisfactory results in the early postoperative period. However, compliance with ideal criteria will not allow to effectively provide care for patients with terminal lung disease under conditions of continuous growth of «waiting list»

МНОГОФАКТОРНАЯ ОЦЕНКА ПОСМЕРТНОГО ДОНОРА С ПОЗИЦИИ ТРАНСПЛАНТАЦИИ ЛЕГКИХ

The appropriate evaluation and the development of special measures to protect donor lungs are important factors for successful lung transplantation. Aim. To develop and determine the effectiveness of the protocol of morpho- functional assessment of potential lung donor. Methods and results. During the period from May, 2011 to May, 2012, 37 donors with diagnoses of brain death were surveyed. 5 bilateral lung transplantations were performed only in 2 cases donors have been evaluated as «ideal». In the majority of recipients early postoperative period was evaluated as satisfactory. Conclusion. Designed multivariate algorithm of donor with brain death assess- ment, effectively implemented through the selection of donors for lung transplantation with satisfactory results in the early postoperative period. However, compliance with ideal criteria will not allow to effectively provide care for patients with terminal lung disease under conditions of continuous growth of «waiting list». Цель исследования. Адекватная оценка и разработка специальных мероприятий по защите и восста- новлению морфофункциональнальных свойств легких потенциального донора. Методы и результа- ты. В период с мая 2011 года по май 2012 года наблюдали 37 доноров с диагнозом смерти мозга. Было выполнено 5 билатеральных трансплантаций легких, и только в 2 случаях доноры были определены как удовлетворительные. У большинства реципиентов ранний послеоперационный период протекал удовлет- ворительно. Заключение. Предложенный многофакторный алгоритм поддержки донора со смертью мозга позволяет эффективно отбирать доноров для трансплантации легких с удовлетворительным результатом в раннем послеоперационном периоде. Однако следование идеальным критериям не позволяет оказывать эффективную помощь пациентам в терминальной стадии болезни легких, включенным в лист ожидания трансплантации.

Wideband electrostatic Vibration Energy Harvester (e-VEH) having a low start-up voltage employing a high-voltage integrated interface

PowerMEMS, The 13th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications, 3-6 December, London, UKThis paper reports on an electrostatic Vibration Energy Harvester (e-VEH) system, for which the energy conversion process is initiated with a low bias voltage and is compatible with wideband stochastic external vibrations. The system employs the auto-synchronous conditioning circuit topology with the use of a novel dedicated integrated low-power highvoltage switch that is needed to connect the charge pump and flyback - two main parts of the used conditioning circuit. The proposed switch is designed and implemented in AMS035HV CMOS technology. Thanks to the proposed switch device, which is driven with a low-voltage ground-referenced logic, the e-VEH system may operate within a large voltage range, from a pre-charge low voltage up to several tens volts. With such a high-voltage e-VEH operation, it is possible to obtain a strong mechanical coupling and a high rate of vibration energy conversion. The used transducer/resonator device is fabricated with a batch-processed MEMS technology. When excited with stochastic vibrations having an acceleration level of 0.8 g rms distributed in the band 110-170 Hz, up to 0.75 μW of net electrical power has been harvested with our system. This work presents an important milestone in the challenge of designing a fully integrated smart conditioning interface for the capacitive e-VEHs.Science Foundation IrelandConference website: http://www.powermems.org/AD 18/02/201

New comb geometry of capacitive vibration energy harvesters miniaturizing the air damping effect

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Synchronization Analysis of Networks of Self- Sampled All-Digital Phase-Locked Loops

Abstract — This paper analyses the stability of the synchronized state in Cartesian networks of identical all-digital phase-locked loops (ADPLLs) for clock distribution applications. Such networks consist in Cartesian grids of digitally-controlled oscillator nodes, where each node communicates only with its nearest neighbors. Under certain conditions, we show that the whole network may synchronize both in phase and frequency. A key aspect of this study lies in the fact that, in the absence of an absolute reference clock, the loop-filter in each ADPLL is operated on the irregular rising edges of the local oscillator and consequently, does not use the same operands depending on whether the local clock is leading or lagging. Under simple assumptions, these networks of so-called “self-sampled ” all-digital phase-locked-loops (SS-ADPLLs) can be described as piecewiselinear systems, the stability of which is notoriously difficult to establish, The main contribution of this paper is a simple design rule that must be met by the coefficients of each loop-filter in order to achieve synchronization in a Cartesian network of arbitrary size. Transient simulations indicate that this necessary synchronization condition may also be sufficient for a specific (but important) class of SS-ADPLLs. A synthesis of the different approaches that have been conducted in the study of the synchronization of SS-ADPLLs is also done. I I

A batch-fabricated and electret-free silicon electrostatic vibration energy harvester

International audienceThis paper presents a novel silicon-based and batch-processed MEMS electrostatic transducer for harvesting and converting the energy of vibrations into electrical energy without using an electret layer. Effective conversion from the mechanical-to-electric domains of 61 nW on a 60 M Omega resistive load, under a vibration level of 0.25 g at 250 Hz, has been demonstrated. Rigorous analysis of the efficiency of the harvester is presented, covering issues related with mechanical and electrical operation. Various schemes for the conditioning electronics are discussed and the harvested power measurements using a dc/dc converter are explained in detail. The paper concludes with a comparison with previous electrostatic transducers based on a new simple factor of merit

Limit on Converted Power in Resonant Electrostatic Vibration Energy Harvesters

Based on the formal analysis of a resonant electrostatic vibration energy harvester operating in constant-charge mode with a gap-closing transducer, we show that the system displays universal behaviour patterns. In this paper, we treat the harvester as a nonlinear forced oscillator and bound the area of control parameters where the system displays regular harmonic oscillations allowing the conditioning circuit to operate in the most effective mode. Before the system exhibits irregular behaviour, there exists a universal optimal value of normalised converted power regardless of the system design and control parameters.Science Foundation IrelandAM

A new type of triboelectric nanogenerator with self-actuated series-to-parallel electrical interface based on self-synchronized mechanical switches for exponential charge accumulation in a capacitor

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Employing a MEMS plasma switch for conditioning high-voltage kinetic energy harvesters.

Triboelectric nanogenerators have attracted wide attention due to their promising capabilities of scavenging the ambient environmental mechanical energy. However, efficient energy management of the generated high-voltage for practical low-voltage applications is still under investigation. Autonomous switches are key elements for improving the harvested energy per mechanical cycle, but they are complicated to implement at such voltages higher than several hundreds of volts. This paper proposes a self-sustained and automatic hysteresis plasma switch made from silicon micromachining, and implemented in a two-stage efficient conditioning circuit for powering low-voltage devices using triboelectric nanogenerators. The hysteresis of this microelectromechanical switch is controllable by topological design and the actuation of the switch combines the principles of micro-discharge and electrostatic pulling, without the need of any power-consuming control electronic circuits. The experimental results indicate that the energy harvesting efficiency is improved by two orders of magnitude compared to the conventional full-wave rectifying circuit