262 research outputs found
Pengaruh Amelioran Tanah Pada Pertumbuhan Tanaman Kedelai (Glycine Max L.) Pada Kondisi Salinitas
Salinitas menjadi faktor pembatas pertumbuhan tanaman pada tanah salin. Peningkatan pertumbuhan dapat dilakukan dengan cara menggunakan varietas tahan serta penambahan amelioran yang dapat memperbaiki kondisi tanah. Penelitian ini bertujuan untuk mengetahui pengaruh pemberian amelioran tanah terhadap pertumbuhan dari genotip tanaman kedelai. Penelitian dilakukan pada bulan Juni hingga September 2014 di rumah kaca Kebun Percobaan Fakultas Pertanian Jatikerto, Kabupaten Malang. Metode penelitian menggunakan rancangan petak terbagi (RPT) faktorial yang terdiri petak utama yaitu genotip kedelai dan anak petak yaitu amelioran. Hasil penelitian menunjukkan genotip kedelai yang berbeda memiliki hasil yang berbeda pula. Pada hasil pertumbuhan, Varietas Wilis dan Tanggamus memiliki nilai tinggi tanaman, jumlah daun, luas daun, serta bobot kering tajuk dan akar yang lebih tinggi dibandingkan dengan Genotip IAC, 100/Bur//Malabar dan Argopuro//IAC, 100. Namun pada hasil pertumbuhan indeks klorofil daun menunjukkan Genotip IAC, 100/Bur//Malabar dan Argopuro//IAC, 100 lebih baik dibandingkan dengan Varietas Wilis dan Tanggamus. Pada penggunaan amelioran, amelioran jerami secara umum menunjukkan hasil pada parameter tinggi tanaman, jumlah daun dan bobot kering tajuk, yang lebih tinggi dibandingkan dengan amelioran yang lain. Sedangkan pada hasil interaksi hanya terjadi pada tinggi tanaman pada umur tanaman 14, 56 dan 63 hst
Detection of Polarized Broad Emission in the Seyfert 2 Galaxy Mrk 573
We report the discovery of the scattered emission from a hidden broad-line
region (BLR) in a Seyfert 2 galaxy, Mrk 573, based on our recent
spectropolarimetric observation performed at the Subaru Telescope. This object
has been regarded as a type 2 AGN without a hidden BLR by the previous
observations. However, our high quality spectrum of the polarized flux of Mrk
573 shows prominent broad (~3000 km/s) H_alpha emission, broad weak H_beta
emission, and subtle Fe II multiplet emission. Our new detection of these
indications for the presence of the hidden BLR in the nucleus of Mrk 573 is
thought to be owing to the high signal-to-noise ratio of our data, but the
possibility of a time variation of the scattered BLR emission is also
mentioned. Some diagnostic quantities such as the IRAS color, the radio power,
and the line ratio of the emission from the narrow-line region of Mrk 573 are
consistent with the distributions of such quantities of type 2 AGNs with a
hidden BLR. Mrk 573 is thought to be an object whose level of the AGN activity
is the weakest among the type 2 AGNs with a hidden BLR. In terms of the
systematic differences between the type 2 AGNs with and without a hidden BLR,
we briefly comment on an interesting Seyfert 2 galaxy, Mrk 266SW, which may
possess a hidden BLR but has been treated as a type 2 AGNs without a hidden
BLR.Comment: 9 pages including 6 figures, to appear in The Astronomical Journa
Polarity in GaN and ZnO: Theory, measurement, growth, and devices
This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Appl. Phys. Rev. 3, 041303 (2016) and may be found at https://doi.org/10.1063/1.4963919.The polar nature of the wurtzite crystalline structure of GaN and ZnO results in the existence of a spontaneous electric polarization within these materials and their associated alloys (Ga,Al,In)N and (Zn,Mg,Cd)O. The polarity has also important consequences on the stability of the different crystallographic surfaces, and this becomes especially important when considering epitaxial growth. Furthermore, the internal polarization fields may adversely affect the properties of optoelectronic devices but is also used as a potential advantage for advanced electronic devices. In this article, polarity-related issues in GaN and ZnO are reviewed, going from theoretical considerations to electronic and optoelectronic devices, through thin film, and nanostructure growth. The necessary theoretical background is first introduced and the stability of the cation and anion polarity surfaces is discussed. For assessing the polarity, one has to make use of specific characterization methods, which are described in detail. Subsequently, the nucleation and growth mechanisms of thin films and nanostructures, including nanowires, are presented, reviewing the specific growth conditions that allow controlling the polarity of such objects. Eventually, the demonstrated and/or expected effects of polarity on the properties and performances of optoelectronic and electronic devices are reported. The present review is intended to yield an in-depth view of some of the hot topics related to polarity in GaN and ZnO, a fast growing subject over the last decade
The HST Cosmos Project: Contribution from the Subaru Telescope
The Cosmic Evolution Survey (COSMOS) is a Hubble Space Telescope (HST)
treasury project.The COSMOS aims to perform a 2 square degree imaging survey of
an equatorial field in (F814W) band, using the Advanced Camera for Surveys
(ACS). Such a wide field survey, combined with ground-based photometric and
spectroscopic data, is essential to understand the interplay between large
scale structure, evolution and formation of galaxies and dark matter. In 2004,
we have obtained high-quality, broad band images of the COSMOS field ( and ) using Suprime-Cam on the Subaru
Telescope, and we have started our new optical multi-band program, COSMOS-21 in
2005. Here, we present a brief summary of the current status of the COSMOS
project together with contributions from the Subaru Telescope. Our future
Subaru program, COSMOS-21, is also discussed briefly.Comment: 4 pages, 3 figures, to appear in the Proceedings of the 6th East
Asian Meeting on Astronomy, JKAS, 39, in pres
Understanding an empirically optimized contact
The electronic structure of the interface between the boron-doped oxygenated
amorphous silicon âwindow layerâ (a-SiOx:H(B)) and aluminum-doped zinc oxide
(ZnO:Al) was investigated using hard x-ray photoelectron spectroscopy and
compared to that of the boron-doped microcrystalline silicon (ÎŒc-
Si:H(B))/ZnO:Al interface. The corresponding valence band offsets have been
determined to be (â2.87â±â0.27)âeV and (â3.37â±â0.27)âeV, respectively. A
lower tunnel junction barrier height at the ÎŒc-Si:H(B)/ZnO:Al interface
compared to that at the a-SiOx:H(B)/ZnO:Al interface is found and linked to
the higher device performances in cells where a ÎŒc-Si:H(B) buffer between the
a-Si:H p-i-n absorber stack and the ZnO:Al contact is employed
Observation of discrete time-crystalline order in a disordered dipolar many-body system
Understanding quantum dynamics away from equilibrium is an outstanding
challenge in the modern physical sciences. It is well known that
out-of-equilibrium systems can display a rich array of phenomena, ranging from
self-organized synchronization to dynamical phase transitions. More recently,
advances in the controlled manipulation of isolated many-body systems have
enabled detailed studies of non-equilibrium phases in strongly interacting
quantum matter. As a particularly striking example, the interplay of periodic
driving, disorder, and strong interactions has recently been predicted to
result in exotic "time-crystalline" phases, which spontaneously break the
discrete time-translation symmetry of the underlying drive. Here, we report the
experimental observation of such discrete time-crystalline order in a driven,
disordered ensemble of dipolar spin impurities in diamond at
room-temperature. We observe long-lived temporal correlations at integer
multiples of the fundamental driving period, experimentally identify the phase
boundary and find that the temporal order is protected by strong interactions;
this order is remarkably stable against perturbations, even in the presence of
slow thermalization. Our work opens the door to exploring dynamical phases of
matter and controlling interacting, disordered many-body systems.Comment: 6 + 3 pages, 4 figure
In Memoriam, Academician Prof. Dr. Osor Shagdarsuren (1929-2010)
Academician, Professor Osor Shagdarsuren passed away due to apoplexy on Tuesday, February 2, 2010, at the age of 81. He was one of the most respected Mongolian ornithologists, biologists, and educators. The Mongolian scientific community has lost one of its greatest members, the premier Mongolian ornithologist
Subaru Spectropolarimetry of Mrk 573: The Hidden High-Ionization Nuclear Emission-Line Region inside the Dusty Torus
We report on the result of our high quality spectropolarimetric observation
for the narrow-line region in a nearby Seyfert 2 galaxy, Mrk 573, by the Subaru
Telescope. The polarized flux spectrum of Mrk 573 shows not only prominent
scattered broad H emission but also various narrow forbidden emission
lines. We find that the measured polarization degree of the observed forbidden
emission lines is positively correlated with the ionization potential of the
corresponding ions and the critical density of the corresponding transitions.
We discuss some possible origins of these correlations, and then we point out
that the correlations are caused due to the obscuration of the stratified
narrow-line region in Mrk 573 by the optically and geometrically thick dusty
torus, just similar to the previous study on NGC 4258.Comment: 10 pages including 8 figures, to appear in The Astronomical Journa
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