The well-known discussion on an engine consisting of a ratchet and a pawl in R.9] is shown to contain some misguided aspects: since the engine is simultaneously in contact with reservoirs at diierent temperatures , it can never work in a reversible way. As a consequence, the engine can never achieve the eeciency of a Carnot cycle, not even in the limit of zero power (innnitely slow motion), in ...

The traditional Mizo had various community feasts and celebrations, which were performed at specific time period of the year. three principle celebrations are Chapchar Kut (celebration spring), Mim when yields other than paddy is first procured), Pawl harvest). adored social gathering bustles, likewise, was a typical element their public activity. Here we will look into what thought about funda...

Bu araştırmada menderes coğrafi oluşumları ile karakterize edilen Ordu İli Aybastı İlçesi Perşembe yaylasından toplanan lokal endemik Alchemilla orduensis çalışılmıştır. Bitkinin vejetatif ve generetif dönemlerinde örneklerinin toprak üstü altı kısımlarında N, C, H S elementlerinin miktarları tespit edilmiştir. elementine çiçekli dönemdeki bitki örneklerinde az miktarda rastlanılmıştır. N mikta...

The aim of this study was to identify the flavonoid constituents of the Bulgarian endemic Alchemilla jumrukczalica Pawl. and evaluate the antiradical scavenging activity of the total extract, fractions and individual compounds. The total MeOH extract exhibited a significant DPPH activity (IC50 10.7±0.4 μg/ml), while EtOAc fraction obtained after partition of the total extract was found to be th...

A CNC machine tool for machining designed to facilitate the replacement of cutting tools includes a workbench, motor and hydraulic cylinder. The inner bearing workbench is connected with rotating rod, outer key rod half gear, output end lower rod. machining, which convenient replacing tools, realizes linkage between body adjusting gear by using tooth block, drives move rotation screw adjust pos...

The Feynman-Smoluchowski Engine (FSE) is simply a ratchet and pawl device, connected by a shaft to a vane, that is small enough to rectify the effect of random bombardment of gas molecules on the vane. The significance of the FSE is that it has inspired much activity in the area of Brownian ratchets. There is considerable interest in both the FSE and Brownian ratchets as these models are findin...