Effects of the Porosity of the Source Materials on the Initial Growth of 6H-SiC Crystal

2010 ◽  
Vol 25 (2) ◽  
pp. 177-180
Author(s):  
Xi LIU ◽  
Bo-Yuan CHEN ◽  
Zhi-Zhan CHEN ◽  
Li-Xin SONG ◽  
Er-Wei SHI
Keyword(s):  
Initial Growth ◽  
Source Materials

Epitaxial growth manner and structure of superconducting oxide films

1990 ◽  
Vol 48 (4) ◽  
pp. 2-3
Author(s):  
Yoshichika Bando ◽  
Takahito Terashima ◽  
Kenji Iijima ◽  
Kazunuki Yamamoto ◽  
Kazuto Hirata ◽  
...  
Keyword(s):  
Ultrathin Films ◽  
Film Surface ◽  
High Energy ◽  
Epitaxial Films ◽  
Layer By Layer ◽  
Initial Growth ◽  
In Situ Growth ◽  
High Quality ◽  
Activated Reactive Evaporation

The high quality thin films of high-Tc superconducting oxide are necessary for elucidating the superconducting mechanism and for device application. The recent trend in the preparation of high-Tc films has been toward “in-situ” growth of the superconducting phase at relatively low temperatures. The purpose of “in-situ” growth is to attain surface smoothness suitable for fabricating film devices but also to obtain high quality film. We present the investigation on the initial growth manner of YBCO by in-situ reflective high energy electron diffraction (RHEED) technique and on the structural and superconducting properties of the resulting ultrathin films below 100Å. The epitaxial films have been grown on (100) plane of MgO and SrTiO, heated below 650°C by activated reactive evaporation. The in-situ RHEED observation and the intensity measurement was carried out during deposition of YBCO on the substrate at 650°C. The deposition rate was 0.8Å/s. Fig. 1 shows the RHEED patterns at every stage of deposition of YBCO on MgO(100). All the patterns exhibit the sharp streaks, indicating that the film surface is atomically smooth and the growth manner is layer-by-layer.

Nucleation and initial growth of Pd2Si crystals on Si(111)

1993 ◽  
Vol 51 ◽  
pp. 844-845
Author(s):  
Xianghong Tong ◽  
Oliver Pohland ◽  
J. Murray Gibson
Keyword(s):  
High Vacuum ◽  
Dark Field ◽  
Ultra High Vacuum ◽  
Initial Growth ◽  
Surface And Interface ◽  
Dark Field Imaging ◽  
Transmission Electron ◽  
Initial Stage ◽  
Effect Of Surface

The nucleation and initial stage of Pd2Si crystals on Si(111) surface is studied in situ using an Ultra-High Vacuum (UHV) Transmission Electron Microscope (TEM). A modified JEOL 200CX TEM is used for the study. The Si(111) sample is prepared by chemical thinning and is cleaned inside the UHV chamber with base pressure of 1x10−9 τ. A Pd film of 20 Å thick is deposited on to the Si(111) sample in situ using a built-in mini evaporator. This room temperature deposited Pd film is thermally annealed subsequently to form Pd2Si crystals. Surface sensitive dark field imaging is used for the study to reveal the effect of surface and interface steps.The initial growth of the Pd2Si has three stages: nucleation, growth of the nuclei and coalescence of the nuclei. Our experiments shows that the nucleation of the Pd2Si crystal occurs randomly and almost instantaneously on the terraces upon thermal annealing or electron irradiation.

Identifying groups of airborne particles by ordination

1994 ◽  
Vol 52 ◽  
pp. 856-857
Author(s):  
M. Shlepr ◽  
C. M. Vicroy
Keyword(s):  
Elemental Analysis ◽  
Energy Dispersive Spectroscopy ◽  
Manufacturing Process ◽  
Spatial Representation ◽  
Airborne Particles ◽  
Common Source ◽  
Data Set ◽  
Microelectronics Industry ◽  
Induced Changes ◽  
Source Materials

The microelectronics industry is heavily tasked with minimizing contaminates at all steps of the manufacturing process. Particles are generated by physical and/or chemical fragmentation from a mothersource. The tools and macrovolumes of chemicals used for processing, the environment surrounding the process, and the circuits themselves are all potential particle sources. A first step in eliminating these contaminants is to identify their source. Elemental analysis of the particles often proves useful toward this goal, and energy dispersive spectroscopy (EDS) is a commonly used technique. However, the large variety of source materials and process induced changes in the particles often make it difficult to discern if the particles are from a common source.Ordination is commonly used in ecology to understand community relationships. This technique usespair-wise measures of similarity. Separation of the data set is based on discrimination functions. Theend product is a spatial representation of the data with the distance between points equaling the degree of dissimilarity.

Screen Presence

2016 ◽  
Author(s):  
Stephen Monteiro
Keyword(s):  
Contemporary Art ◽  
Social Contexts ◽  
Popular Media ◽  
Andy Warhol ◽  
Film Culture ◽  
Artistic Practice ◽  
Popular Film ◽  
Robert Rauschenberg ◽  
Mona Hatoum ◽  
Source Materials

Cinema plays a major role in contemporary art, yet the deeper influence of its diverse historical forms on artistic practice has received little attention. Working from a media and cultural studies perspective, Screen Presence explores the intersections of film, popular media, and art since the 1950s through the examples of four pivotal figures – Andy Warhol, Robert Rauschenberg, Mona Hatoum and Douglas Gordon. While their film-related works may appear primarily as challenges to conventional cinema, these artists draw on overlooked forms of popular film culture that have been commonplace, and even dominant, in specific social contexts. Through analysis of a range of examples and source materials, Stephen Monteiro demonstrates the dependence of contemporary artists on cinema’s shifting applications and interpretations, offering a fresh understanding of the enduring impact of everyday media on how we make and view art.

Documents and Source Material

2017 ◽  
Vol 46 (3) ◽  
pp. 1-26
Keyword(s):  
Prime Minister ◽  
Palestinian Authority ◽  
Donald Trump ◽  
The West ◽  
White House ◽  
Peace Negotiations ◽  
Annotated List ◽  
Un Security Council ◽  
The Government ◽  
Source Materials

This section comprises international, Arab, Israeli, and U.S. documents and source materials, as well as an annotated list of recommended reports. Significant developments this quarter: In the international diplomatic arena, the UN Security Council approved Resolution 2334, reaffirming the illegality of Israeli settlements and calling for a return to peace negotiations. Additionally, former U.S. secretary of state John Kerry delivered a final address on the Israel-Palestine conflict, outlining a groundwork for negotiations. Two weeks later, international diplomats met in Paris to establish incentives for Israeli prime minister Benjamin Netanyahu and Palestinian Authority president Mahmoud Abbas to return to the negotiating table. Despite international discussions of peace talks and the impediment settlements pose to a two-state solution, the Israeli Knesset passed the controversial Regulation Law, enabling the government to retroactively legalize settlements and confiscate Palestinian land throughout the West Bank. Meanwhile, U.S. president Donald Trump took office on 20 January 2017, and he wasted no time before inviting Netanyahu to the White House for their first meeting, in February.

Documents and Source Material

2017 ◽  
Vol 47 (1) ◽  
pp. 1-7
Keyword(s):  
Human Rights ◽  
Source Material ◽  
Human Rights Abuses ◽  
Palestinian Territories ◽  
Source Materials ◽  
Israeli Occupation

This section comprises JPS summaries and links to international, Arab, Israeli, and U.S. documents and source materials from the quarter spanning 16 May-15 November 2017. Fifty years of Israeli occupation was the focus of reports by the UN Office for the Coordination of Humanitarian Affairs (OCHA) and Oxfam that documented the ongoing human rights abuses in the occupied Palestinian territories. Other notable documents include Israeli NGO Gisha and UNSCO reports on the ten-year Gaza siege, Al Jazeera's interactive timeline of the Nakba, and an exchange of letters between the ACLU and U.S. senators on anti-BDS legislation.

Germination and initial growth of triticale seeds under stationary magnetic fields

2014 ◽  
Vol 2 (2) ◽  
pp. 72-79 ◽  
Author(s):  
Mercedes Florez ◽  
Elvira Martinez ◽  
Victoria Carbonell
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Seed Vigor ◽  
Initial Growth ◽  
Practical Application ◽  
Biochemical Processes ◽  
Mean Germination Time ◽  
Nutrition Value ◽  
The Mean ◽  
Growth Of Seedlings

The main objective of this study is to determine the effects of 125 mT and 250mT magnetic treatment on the germination and initial growth of triticale seeds. This objective has a practical application in agriculture science: early growth of triticale. An increase in the percentage and rate of germination of seeds and a stimulation of growth of seedlings as positive response to magnetic field treatment in rice, wheat, maize and barley seeds have been found in previous studies. Germination tests were carried out under laboratory conditions by exposing triticale seeds to magnetic field for different times. The effect was studied by exposure of seeds prior sowing. The mean germination time were reduced for all the magnetic treatments applied. Most significant differences were obtained for time of exposure of 1 and 24 hours and maximum reductions was 12%. Furthermore, seedlings from magnetically treated seeds grew taller than control. The longest mean total length was obtained from seedlings exposed to 125 and 250 mT for 24 hours. External magnetic fields are assumed to enhance seed vigor by influencing the biochemical processes by stimulating activity of proteins and enzymes. Numerous studies suggested that magnetic field increases ions uptake and consequently improves nutrition value.

Literary Chronicles of the Qajars’ Epoch

2018 ◽  
Vol 5 (1) ◽  
pp. 170-173
Author(s):  
Gulnar Aqiq Jafarzade
Keyword(s):  
Nineteenth Century ◽  
Original Source ◽  
Literary Movement ◽  
Literary Environment ◽  
Source Materials

Abstract Following a historical appraisal and the progress of literature and poetry during the Qajar era, this article focuses on the specific literary environment in nineteenth century. As literature has effect in all areas such as cultural, social and other affairs, it is important to remember that Qajars’ rulers Fathali Shah and Nasiraddin Shah had an influential role in the comprehensive evolution of the literary environment in this period. Literary chronicles covered the works written during Qajar dynasty can be considered the most important sources for researching literary processes. Circle of poets inside and outside of the court led the new founded literary movement “bazgasht” (“Return”), turning to the their predecessors for the inspiration in this period. The most important and wealthy genre of literature were tazkiras (biographical books of anthology), based on the original source materials in Arabian, Persian, and sometimes in Turkish, especially written about poets and poetry.

Effect of intercrops on growth and yield of turmeric (Curcuma longa L.)

2017 ◽  
Vol 26 (1) ◽  
pp. 51
Author(s):  
R Chitra, P Hemalatha
Keyword(s):  
Short Duration ◽  
Agricultural Research ◽  
Curcuma Longa ◽  
Growth And Yield ◽  
Research Station ◽  
Initial Growth ◽  
Agricultural Research Station

The initial growth of turmeric is rather slow and takes about 4-5 months to cover the inter space. Therefore, the available space between the rows of turmeric could be effectively utilized by growing short duration crops like, vegetables, cereals etc. Hence, it is worthwhile to explore the possibilities of growing compatible crops with turmeric. With this background the experiment on effect of intercrops on growth and yield of turmeric was conducted at Agricultural Research Station, Bhavanisagar. Among the different intercrops, turmeric with cowpea recorded the maximum fresh rhizome yield per hectare (30.78 t ha-1) while turmeric + bhendi registered the maximum B:C ratio (2.68:1). Monocropping of turmeric recorded the lowest B:C ratio (1.67:1) among all the treatments.  

Oral Testimony as Historical Source Material for the Reconstruction of the Judicial History of Shipping in India (1600-1800)

2019 ◽  
Vol 7 (1) ◽  
Author(s):  
Mir Kamruzzman Chowdhary
Keyword(s):  
Nineteenth Century ◽  
Source Material ◽  
Maritime History ◽  
Historical Source ◽  
Alternative Source ◽  
Oral Testimony ◽  
History Of ◽  
Judicial History ◽  
Source Materials

This study was an attempt to understand how the available alternative source materials, such as oral testimonies can serve as valuable assets to unveiling certain aspects of maritime history in India. A number of themes in maritime history in India failed to get the attention of the generation of historians, because of the paucity of written documents. Unlike in Europe, the penning down of shipping activities was not a concern for the authorities at the port in India. The pamphlets and newsletters declared the scheduled departure of the ship in Europe but, in India, this was done verbally. Therefore, maritime history in India remained marginalised. Hence, in this article, I make an endeavour to perceive how the oral testimonies can help shed some new light on certain aspects of maritime history in India, such as life on the ship, maritime practices, and perceptions among the littoral people in coastal societies. This article also outlines an approach on how the broader question on the transformation of scattered maritime practices among coastal societies can be adapted and transferred into an organised institution of law by the nineteenth century, and how these can be pursued in future. I also suggest in this article that the role of Europeans, especially the British, in the process of transformation, can be investigated further through oral testimonies in corroboration with the colonial archival records.

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