Preliminary Test of Thermionic Converter/Heat Pipe Assembly

assembly performance of a gasketed bolted flanged pipe joint using different bolt tightening strategies

this paper presents the results of the assembly process of a gasketed bolted flanged pipe joint for two different bolt tightening strategies, i.e. asme and industrial using torque control of preload method.  the final clamping force is achieved in four and five passes in asme and industrial strategy respectively. axial bolt stress variation, at the end of each pass, individual bolt bending beha...

students perception of computerized toefl test

تحقیق حاضر به بررسی درک دانشجویان از مزایا و معایب آزمون های کامپیوتری تافل و تاثیر جنسیت بر درک آنها پرداخته است. شرکت کنندگان در این تحقیق 100 نفرزبان آموز مرد و زن بودند که در آزمون کامپیوتری تافل در ایران شرکت کرده بودند. پرسشنامه یی که در مورد مزایا و معایب آزمون های کامپیوتری در مقایسه با آزمون های کاغذی توسط محقق تهیه شده بود جهت تکمیل به این افراد ارایه شد. داده های بدست آمده در این مطا...

Cid Thermionic Gun System*

A new high-current thermionic gun has been installed on the CID injector at SLAC and brought into operation. The gun and pulser system generate three nanosecond pulses of about six amps peak which, when bunched in the subharmonic buncher system, produce in excess of 1011 electrons in a single S-band accelerated bunch. Preliminary operation of the gun is described, and details of the avalanche c...

eterostrueture Integrated Thermionic Refrigeration

Thermionic emission in heterostructures is investigated for integrated cooling of high power electronic and optoelectronic devices. This evaporative cooling is achieved by selective emission of hot electrons over a barrier layer from the cathode to the anode. As the energy distribution of emitted electrons is almost exclusively on one side of Fermi energy, upon the current flow, strong carrier-...

Low Emittance Thermionic Electron Guns*