A remote programming module of FPGA boards

This paper presents a concept of implementation of a remote programmable FPGA module on selected hardware platforms. The possibilities of programmable matrix configurations and different ways of data transmission through an appropriate interface are described. The measurement results of operating times for the solution proposed by the authors are given

A parametric synthesizer of audio signals on FPGA

The paper presents a sound synthesizer dedicated to parametric sound compression, but also able to generate any signal in the audible band. The synthesizer is realized on an FPGA platform, and it uses additive sound synthesis. The synthesizer is characterized by a high quality, faithful reproduction of sound and low power consumption

THE COMPATIBILITY BETWEEN WOOL FIBERS AND CEMENTITIOUS MORTARS

The addition of natural fibers residue in cement based materials can be a sustainable technological alternative for traditional dispersed reinforcement, and can improve the performance of brittle matrix materials. The presence of a wool reinforcement can increase the fracture toughness and, at the same time, can reduce the environmental impact of cementitious mortars. The beneficial effects are similarly to those observed in presence of vegetal fibers (e.g., hemp), which have been largely investigated in the literature. However, there are some limits in the use of wool fibers due to their chemical compatibility with the cement matrix, as they can dissolve in alkaline environments. In the present paper, to investigate the compatibility between wool fibers and cementitious mortars, laboratory prototypes have been taken into consideration. Three series of wool-reinforced mortar beams have been cast and cured in water (20°C) or in dry conditions (temp. 20 °C, 50% R.H.) for some days. Portland-limestone cement CEM II has been used, whereas the content of fibers has been limited to about 1% in volume to maintain the workability of the mortars. To investigate the chemical compatibility, and the subsequent effects on the mechanical performances, prototypes have been tested in three point bending. After the mechanical test, the mortars microstructure was evaluated through SEM images and by thin section in transmitted light, in order to individuate a possible relationship between the dissolution of wool and curing conditions. The microstructure observation revealed the capability of wool fibers to bridge the cracks, and to reduce the brittleness of plain mortars. The differences in the mortars microstructure due to alternative curing conditions were also observed and described in the paper. Accordingly, wool could be effectively used to reduce the plastic shrinkage of cement-based composites, like the industrially manufactured polypropylene fibers

Evaluation of functional properties and fibroblast growth on squashy cellular scaffolds

Zbadano wpływ dodatku ciekłych prekursorów porów na morfologię, porowatość i właściwości mechaniczne polilaktydowych rusztowań komórkowych. Rusztowania otrzymano metodą mokrej inwersji faz w wariancie freeze extraction. Oceniono cytotoksyczność wybranych rusztowań w stosunku do fibroblastów mysich oraz ich przydatność do hodowli komórkowych. Wykazano, że dodatek prekursora porów dopolilaktydu korzystnie zmienia morfologię wytworzonych rusztowań, jednocześnie pogarszając ich wytrzymałość mechaniczną. Stwierdzono, że polilaktydowe rusztowania komórkowe z powodzeniem mogą być wykorzystywane do hodowli komórkowych.The effect of liquid pore precursor addition on the morphology, porosity and mechanical properties of polylactide scaffolds was investigated. The scaffolds were obtained by inversion phase method in freeze extraction mode. Selected scaffolds were subjected to a cytotoxicity test using mouse fibroblastcells. It has been shown that the addition of pore precursors favorably changes the morphology of scaffolds at the cost of decreased mechanical strength. It has been found that polylactide cellular scaffolds can be successfully used forcell culture

A study of organizational cynicism and how it is affected by social exchange relationships at work

Drawing on the social exchange theory, organizational cynicism has been suggested as a central consequence of psychological contract (PC) breach. In this study, we examine the extent to which social exchange relationships with the supervisor and coworkers have an impact on cynical reactions to broken employer promises. Based on two‐wave data with a time lag of three months from a sample of 781 employees, we investigated the influence of employees’ perceived PC breach on cynical thoughts, emotions, and behaviours, and the moderating effects of leader–member exchange (LMX) and coworker exchange (CWX). Using structural equation modelling, we found that PC breach was positively associated with cognitive, affective, and behavioural cynicism. Our analysis further revealed that LMX and CWX moderated different dimensions of organizational cynicism: When LMX was high, employees reacted more sensitively to a PC breach with cognitive and behavioural cynicism. In contrast, CWX attenuated employees’ affective cynical response to a PC breach. The differentiated perspective on cognitive, affective, and behavioural cynicism and the identified moderating effects help explain varying strengths of the PC breach–organizational cynicism association found in previous research and highlight contingencies related to social exchange relationships at work.ISSN:0963-1798ISSN:2044-832