Самоконтроль артериального давления, некоторые методические аспекты

давлениегипертензи

Сравнительная клинико-гормональная характеристика состояния здоровья и качество жизни женщин с хирургической и естественной менопаузой

ГОРМОНЫДЕПРЕССИЯЖЕНЩИНЫКАЧЕСТВО ЖИЗНИМЕНОПАУЗАПОСТМЕНОПАУЗ

FAILURE MODE SHIFTS IN FATIGUE OF SANDWICH BEAMS

SUMMARY Sandwich beams are designed and tested in fatigue, and it is found that for high load and small number of cycles to failure, the beams fail by face tensile fracture. For lower loads, and large number of cycles to failure, the beams fail by core shear

Multifunctional Carbon Fiber Composites: A Structural, Energy Harvesting, Strain-Sensing Material

Multifunctional structural materials are capable of reducing system level mass and increasing efficiency in load carrying structures. Materials that are capable of harvesting energy from the surrounding environment are advantageous for autonomous electrically powered systems. However, most energy harvesting materials are non-structural and add parasitic mass, reducing structural efficiency. Here, we show a structural energy harvesting composite material consisting of two carbon fiber (CF) layers embedded in a structural battery electrolyte (SBE) with a longitudinal modulus of 100 GPa-almost on par with commercial CF pre-pregs. Energy is harvested through mechanical deformations using the piezo-electrochemical transducer (PECT) effect in lithiated CFs. The PECT effect creates a voltage difference between the two CF layers, driving a current when deformed. A specific power output of 18 nW/g is achieved. The PECT effect in the lithiated CFs is observed in tension and compression and can be used for strain sensing, enabling structural health monitoring with low added mass. The same material has previously been shown capable of shape morphing. The two additional functionalities presented here result in a material capable of four functions, further demonstrating the diverse possibilities for CF/SBE composites in multifunctional applications in the future

Conceptual design framework for laminated structural battery composites

The structural battery composite is a class of composite materials with ability to provide mechanical integrity in a structural system while simultaneously store electrical energy (i.e. work as a battery). In this paper a framework to estimate the mechanical and electrical performance of laminated structural battery composites is proposed. The mechanical performance of the battery composite laminate is assessed by estimating the in-plane elastic properties of the laminate using Classical Laminate Theory. The electrical performance is assessed estimating the specific capacity and energy density of the component. The developed framework is applied on an A4 sized structural battery composite demonstrator, as part of the Clean Sky 2 project SORCERER [1] to demonstrate the capabilities of the framework. The design process for the demonstrator is presented and mechanical and electrical performance metrics are estimated for three laminate configurations, one promoting structural performance, one promoting electrical performance and one intermediate. As the material provides both load carrying and electrical energy storage capabilities, the laminate configuration can be alternated to provide suitable performance based on the purpose of the component

Аналитическая зависимость для послойной деформации металлофторопластовой полосы

Тез. докл. VIII Междунар. науч.-техн. конф. (науч. чтения, посвящ. П. О. Сухому), Гомель, 28–29 окт. 2010 г

Измерение энергии тепловых потерь мощного светодиодного модуля

Разработана и реализована методика измерения тепловых характеристик мощного светодиодного модуля. Методика позволяет с достаточной точностью определять мощность тепловых потерь. Результаты измерений подтверждаются измерениями мощности световой энергии, излучаемой светодиодным модулем с помощью калиброванного спектрорадиометрического комплекса.The methods of measuring heat characteristics of high power LED module are developed and implemented. The methods enable with sufficient accuracy to determine heat loss power. Measurement results are confirmed by measurements of the power of light energy emitted by LED module with the use of calibrated spectraradiometric complex

A screen-printing method for manufacturing of current collectors for structural batteries

Structural carbon fibre composite batteries are a type of multifunctional batteries that combine the energy storage capability of a battery with the load-carrying ability of a structural material. To extract the current from the structural battery cell, current collectors are needed. However, current collectors are expensive, hard to connect to the electrode material and add mass to the system. Further, attaching the current collector to the carbon fibre electrode must not affect the electrochemical properties negatively or requires time-consuming, manual steps. This paper presents a proof-of-concept method for screen-printing of current collectors for structural carbon fibre composite batteries using silver conductive paste. Current collectors are screen-printed directly on spread carbon fibre tows and a polycarbonate carrier film. Experimental results show that the electrochemical performance of carbon fibre vs lithium metal half-cells with the screen-printed collectors is similar to reference half-cells using metal foil and silver adhered metal-foil collectors. The screen-printed current collectors fulfil the requirements for electrical conductivity, adhesion to the fibres and flexible handling of the fibre electrode. The screen-printing process is highly automatable and allows for cost-efficient upscaling to large scale manufacturing of arbitrary and complex current collector shapes. Hence, the screen-printing process shows a promising route to realization of high performing current collectors in structural batteries and potentially in other types of energy storage solutions