120kW RF Power Processing Unit In-vacuum Testing for a VASIMR® System

ASCEND 2020 ◽  
2020 ◽  
Author(s):  
Matthew Giambusso ◽  
Jared P. Squire ◽  
Franklin R. Chang Díaz ◽  
Aidan Corrigan ◽  
Tim Hardy
Author(s):  
S.K. Streiffer ◽  
C.B. Eom ◽  
J.C. Bravman ◽  
T.H. Geballet

The study of very thin (<15 nm) YBa2Cu3O7−δ (YBCO) films is necessary both for investigating the nucleation and growth of films of this material and for achieving a better understanding of multilayer structures incorporating such thin YBCO regions. We have used transmission electron microscopy to examine ultra-thin films grown on MgO substrates by single-target, off-axis magnetron sputtering; details of the deposition process have been reported elsewhere. Briefly, polished MgO substrates were attached to a block placed at 90° to the sputtering target and heated to 650 °C. The sputtering was performed in 10 mtorr oxygen and 40 mtorr argon with an rf power of 125 watts. After deposition, the chamber was vented to 500 torr oxygen and allowed to cool to room temperature. Because of YBCO’s susceptibility to environmental degradation and oxygen loss, the technique of Xi, et al. was followed and a protective overlayer of amorphous YBCO was deposited on the just-grown films.


Author(s):  
T. A. Emma ◽  
M. P. Singh

Optical quality zinc oxide films have been characterized using reflection electron diffraction (RED), replication electron microscopy (REM), scanning electron microscopy (SEM), and X-ray diffraction (XRD). Significant microstructural differences were observed between rf sputtered films and planar magnetron rf sputtered films. Piezoelectric materials have been attractive for applications to integrated optics since they provide an active medium for signal processing. Among the desirable physical characteristics of sputtered ZnO films used for this and related applications are a highly preferred crystallographic texture and relatively smooth surfaces. It has been found that these characteristics are very sensitive to the type and condition of the substrate and to the several sputtering parameters: target, rf power, gas composition and substrate temperature.


2016 ◽  
Vol 2 (1) ◽  
pp. 22-25
Author(s):  
Nur Amalina binti Mustafa ◽  
Muhammad Ashraf bin Redzuan ◽  
Muhamad Hazim bin Zuraimi ◽  
Muhamad Shuhaimi bin Shuib ◽  
Shahnaz Majeed ◽  
...  

Objective: Owing to the habit of consuming ready food among the citizens of Malaysia a study was conducted to evaluate 20 samples of canned soya milk for the presence of possible microbial content. The samples were collected randomly from shopping malls, restaurants and kiosk in Ipoh Malaysia. Methods: All samples collected across Ipoh, were subjected to test for presence bacteria in nutrient agar, blood agar and macConkey media. The possible microbial load was swapped from surface and soya milk content with a sterile cotton and streaked on nutrient agar, blood agar and macConkey culture media. The streaked petri plates were incubated for 48 hours at 37oC. Results: The study revealed negative microbial growth in all except two samples from the surface and soya milk content collected from a restaurant in nutrient agar and blood agar medium. The presence of microbes was conformed as gram positive staphylococcus sp. through gram staining. The positive growth may be imputed to poor storage condition at the restaurant. Conclusion: It can be computed from the study that the majority of the samples were free from bacterial growth, suggesting strong in house quality control mechanism at the processing unit and exquisite storage conditions in malls and kiosk suggesting that soya milk available in malls and kiosk are fit for human consumption.


2016 ◽  
Vol 1 (2) ◽  
pp. 251-269
Author(s):  
Keding Zhang

The imperative-conditional construction (ICC) in English is a type of construction which consists of an ordinary imperative clause and an ordinary declarative clause connected by the connective and or or. This article deals with the speaker intentions of ICCs and their motivations from a cognitive-pragmatic approach. Based on the concept of construction in cognitive linguistics, an ICC can be called a complex symbolic structure which, though composed of two components, should be regarded as a single pragmatic processing unit. It is demonstrated that, in everyday communication, the ICC can usually convey three kinds of speaker intentions: a prohibitive intention, an inducing/forcing intention, and an advisory intention. The first refers to the intention of the speaker to prohibit the hearer from carrying out the act described by the imperative. The second is the intention of the speaker to induce or force the hearer to bring about the act described by the imperative. The third refers to the intention of the speaker to advise the hearer to carry out the act described by the imperative. These speaker intentions are highly motivated. The motivations include the constructional context, the conditional relation between the imperative and the declarative, the directive force of the imperative, the pragmatic enrichment of the declarative, and the complementary and interactive relationship between the imperative and declarative clauses, among which the constructional context serves as an overall motivation, and the rest may be seen as specific motivations.


2000 ◽  
Author(s):  
M. Marchesi ◽  
R. Campaci ◽  
A. Nista ◽  
W. Prendin ◽  
S. Scarpa ◽  
...  

Author(s):  
Hiroshi Yamamoto ◽  
Yasufumi Nagai ◽  
Shinichi Kimura ◽  
Hiroshi Takahashi ◽  
Satoko Mizumoto ◽  
...  

2020 ◽  
Author(s):  
Roudati jannah

Perangkat keras komputer adalah bagian dari sistem komputer sebagai perangkat yang dapat diraba, dilihat secara fisik, dan bertindak untuk menjalankan instruksi dari perangkat lunak (software). Perangkat keras komputer juga disebut dengan hardware. Hardware berperan secara menyeluruh terhadap kinerja suatu sistem komputer. Prinsipnya sistem komputer selalu memiliki perangkat keras masukan (input/input device system) – perangkat keras premprosesan (processing/central processing unit) – perangkat keras luaran (output/output device system) – perangkat tambahan yang sifatnya opsional (peripheral) dan tempat penyimpanan data (storage device system/external memory).


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