1.0 Introduction The use of "microwave holography" as the primary method of evaluating the ALMA antennas and setting their panels has been the project's baseline for several years. There is a long history of such measurements in radio astronomy (e.g., [3-5]). We are particularly drawing on experience at the NRAO in holographic measurements of the 12 M Telescope, 140 Ft Telescope, and VLA antenn...

An analytical and experimental study of multi-port RF power feeding in a four rod-type radio frequency quadrupole (RFQ) has been discussed. First, we have derived generalized relations for multi-coupler based on S-parameters n balanced couplers. Using simulation measurements prototype, the optimum position orientation two couplers an 80 MHz extended vane rod type RFQ determined. A low test carr...

digital preservation refers to an important aspect that most iranian digital library initiatives lack. this component is security. while a digital library may be misconceived as an information supply space without a physical form, the same security concerns in force for operation of physical library are valid. unlike the analog materials, all digital copies of digital materials are original. a ...

Nasal potential difference (PD) measurement has been used as a diagnostic test for cystic fibrosis (CF). It has been shown that large differences in reproducibility of nasal PD measurement can exist between different study sites. These differences reduce the validity of studies. In our study we tried to measure nasal PD values for a group of Turkish CF patients by using a computer based data ac...

Environ. Entomol. 13: 863-867 (1984) ABSTRACT' An electronic integrated-circuit thermometer with multiple probes (3 by 4 by 5 mm each) is described and was used to measure temperatures at the surface and at several depths in the forest litter of Norway spruce, Picea abies (L.) Karst., throughout 3 days in spring. The temperatures at the various depths were recorded on a single-pen recorder/volt...

Diverse configurations of needle-type electrodes are commonly used to generate DC or AC corona discharges in various industrial applications. Previous studies confirm that the amount charges generated by discharge is controlled several factors such as level applied voltage, ambient conditions, well geometry electrode system. This paper aimed evaluate distribution uniformity multiple-row and dep...

© 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim 5320 wileyonlinelibrary.com integrating them in devices permits the applications of devices without external power source or battery. Several examples of various materials and device confi gurations appear in the literature. An example of piezoelectric materials that has been constantly studied is ZnO, mostly in nanowire (NW) form. [ 2–4 ] A nan...

Self-powered sensors are gaining a lot of attention in recent years due to their possible application the Internet Things, medical implants and wireless wearable devices. Human breath detection has applications diagnostics, therapy metabolism monitoring. One approach for monitoring is detecting humidity exhaled air. Here, we present an extremely sensitive, self-powered sensor As power source, u...