4,406 research outputs found
Precise measurements of electron and hole g-factors of single quantum dots by using nuclear field
We demonstrated the cancellation of the external magnetic field by the
nuclear field at one edge of the nuclear polarization bistability in single
InAlAs quantum dots. The cancellation for the electron Zeeman splitting gives
the precise value of the hole g-factor. By combining with the exciton g-factor
that is obtained from the Zeeman splitting for linearly polarized excitation,
the magnitude and sign of the electron and hole g-factors in the growth
direction are evaluated.Comment: 3 pages, 2 figure
Duality with expanding maps and shrinking maps, and its applications to Gauss maps
We study expanding maps and shrinking maps of subvarieties of Grassmann
varieties in arbitrary characteristic. The shrinking map was studied
independently by Landsberg and Piontkowski in order to characterize Gauss
images. To develop their method, we introduce the expanding map, which is a
dual notion of the shrinking map and is a generalization of the Gauss map. Then
we give a characterization of separable Gauss maps and their images, which
yields results for the following topics: (1) Linearity of general fibers of
separable Gauss maps; (2) Generalization of the characterization of Gauss
images; (3) Duality on one-dimensional parameter spaces of linear subvarieties
lying in developable varieties.Comment: 28 pages, v3: added some examples, v2: the title has been changed
from v1 "Linearity of general fibers of separable Gauss maps
30S Beam Development and X-ray Bursts
Over the past three years, we have worked on developing a well-characterized
30S radioactive beam to be used in a future experiment aiming to directly
measure the 30S(alpha,p) stellar reaction rate within the Gamow window of Type
I X-ray bursts. The importance of the 30S(alpha,p) reaction to X-ray bursts is
discussed. Given the astrophysical motivation, the successful results of and
challenges involved in the production of a low-energy 30S beam are detailed.
Finally, an overview of our future plans regarding this on-going project are
presented.Comment: 7 pages, 2 figures, 5th European Summer School on Experimental
Nuclear Astrophysics, Santa Tecla, Sicily, September 200
Effect of Minimally Invasive Endotracheal Tube Suctioning on Suction-Related Pain, Airway Clearance and Airway Trauma in intubated Patients: A Randomized Controlled Trial
Background: Due to the frequency and risks associated with endotracheal suctioning, there is a need to examine clinical practice
critically and identify clinical research to guide practice. Correct technique and preparation by the clinicians can assist to reduce
the risks of adverse events and the level of discomfort for the patients.
Objectives: The current study aimed to investigate the effects of routine versus the minimally invasive endotracheal tube suctioning
procedure on suction-related pain, airway clearance and airway trauma in patients who were intubated.
Methods: In this randomized clinical trial, 64 patients with intubation in the intensive care units (ICUs) of Alzahra Hospital, Isfahan,
Iran, were randomly allocated to minimally invasive endotracheal tube suctioning (MIETS) and routine endotracheal tube
suctioning (RETS) groups. Pain intensity was assessed immediately before, immediately after and 10 minutes after endotracheal
tube suctioning (ETS). Airway clearance was defined by numbers of suctioning and airway trauma noted after suctioning. The Chisquare
test, independent T-test, and repeated measures analysis of variance were performed to analyze the data.
Results: There wasnosignificant difference in thenumberof suctions needed to effectively clear airway between the two groups. No
significant differences were observed in the pain score changes during the three -time measurements in the MIETS group. However,
in the RETS group the increase of pain scores were statistically significant during the three- time measurements. In addition, the
numberof airway traumatizationwassignificantly higher in the RETS group. Thenumberof medications used as a pain relief during
10 minutes after the ETS was significantly higher in the RETS group.
Conclusions: The results of the study suggest that using MIETS instead of RETS caused a lower incidence of airway traumatization
and lower suction-related pain intensity. In addition, MIETS was sufficiently effective, the same as RETS, to remove airway secretions.
Hence, MIETS may be useful to reduce the complications of ETS as long as being effective to remove airway secretions
Decay Properties of Bh and Db Produced in the Cm + Na Reaction
Decay properties of an isotope Bh and its daughter nucleus Db
produced by the Cm(Na, 5\textit{n}) reaction were studied by
using a gas-filled recoil separator coupled with a position-sensitive
semiconductor detector. Bh was clearly identified from the correlation
of the known nuclide, Db. The obtained decay properties of Bh
and Db are consistent with those observed in the 113 chain,
which provided further confirmation of the discovery of 113.Comment: Accepted for publication in J. Phys. Soc. JPN., to be published in
Vol.78 No.
Modification of Tillage Implements for Alley Cropping System
Sustainable alley agriculture in the agro-forestry cropping system becomes a great challenge due to the lack of suitable land preparation, using the conventional tillage system “The three-bottom disc plough”. This research is an attempt to modify the conventional tillage implement for better use in agroforestry system. The modified Tillage System, in comparison with 3-bottom disc plough, showed significantly lower tractor actual speed, higher wheel slippage, effective field capacity and higher draught requirements. For the secondary operations, no significant differences were detected between modified tandem and the offset disc harrow, except for the tractor actual speed, where the offset disc harrow resulted in significant higher speed. Moreover, the modified tillage implements shows lower un-ploughed length area within the alley, and two meters increase in the preparation of the available cultivated area compared to the conventional system, and significantly lower bulk density at crop emergence stage only. The modified implements resulted in higher initial and final infiltration rate after seedbed preparation and at harvest in comparison with the conventional system. With regards to crop yield, the modified tillage system resulted in significant higher grain yield in the first and second seasons, in comparison with the use of the conventional tillage system. Keywords: draught requirements, tillage implements, alley cropping, soil cold size, bulk density, superficial lateral root, infiltration rat
Structure of Polyelectrolytes in Poor Solvent
We present simulations on charged polymers in poor solvent. First we
investigate in detail the dilute concentration range with and without imposed
extension constraints. The resulting necklace polymer conformations are
analyzed in detail. We find strong fluctuations in the number of pearls and
their sizes leading only to small signatures in the form factor and the
force-extension relation. The scaling of the peak in the structure factor with
the monomer density shows a pertinent different behavior from good solvent
chains.Comment: 7 pages, 5 figures. submitted to EP
Atomic masses of intermediate-mass neutron-deficient nuclei with relative uncertainty down to 35-ppb via multireflection time-of-flight mass spectrograph
High-precision mass measurements of Cu, Zn, Ga,
Ge, As, Br, Rb, and Sr were performed
utilizing a multireflection time-of-flight mass spectrograph combined with the
gas-filled recoil ion separator GARIS-II. In the case of Ga, a mass
uncertainty of 2.1 keV, corresponding to a relative precision of , was obtained and the mass value is in excellent agreement
with the 2016 Atomic Mass Evaluation. For Ge and Br, where masses
were previously deduced through indirect measurements, discrepancies with
literature values were found. The feasibility of using this device for mass
measurements of nuclides more neutron-deficient side, which have significant
impact on the -process pathway, is discussed.Comment: 15 pages, 6 figures, 1 tabl
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