1,562 research outputs found
Reply to Comment on Extension of the Bethe-Weizsacker mass formula to light nuclei and some new shell closures
Some properties of the modified Bethe-Weizsacker mass formula (BWM) are
discussed. As BWM has no shell effect included, the extra-stability or,
magicity in nuclei clearly stands out when experimental mass data are compared
with BWM predictions. If the shell effect quenches, the BWM predictions come
closer to the experimental data.Comment: 2 pages, no figur
Lung Circulation Modeling: Status and Prospect
Mathematical modeling has been used to interpret anatomical and physiological data obtained from metabolic and hemodynamic studies aimed at investigating structure-function relationships in the vasculature of the lung, and how these relationships are affected by lung injury and disease. The indicator dilution method was used to study the activity of redox processes within the lung. A steady-state model of the data was constructed and used to show that pulmonary endothelial cells may play an important role in reducing redox active compounds and that those reduction rates can be altered with oxidative stress induced by exposure to high oxygen environments. In addition, a morphometric model of the pulmonary vasculature was described and used to detect, describe,and predict changes in vascular morphology that occur in response to chronic exposure to low-oxygen environments, a common model of pulmonary hypertension. Finally, the model was used to construct simulated circulatory networks designed to aid in evaluation of competing hypotheses regarding the relative contribution of various morphological and biomechanical changes observed with hypoxia. These examples illustrate the role of mathematical modeling in the integration of the emerging metabolic, hemodynamic, and morphometric databases
Distribution of Capillary Transit Times in Isolated Lungs of Oxygen-Tolerant Rats
Rats pre-exposed to 85% O2 for 5–7 days tolerate the otherwise lethal effects of 100% O2. The objective was to evaluate the effect of rat exposure to 85% O2 for 7 days on lung capillary mean transit time (t¯c) and distribution of capillary transit times (h c(t)). This information is important for subsequent evaluation of the effect of this hyperoxia model on the redox metabolic functions of the pulmonary capillary endothelium. The venous concentration vs. time outflow curves of fluorescein isothiocyanate labeled dextran (FITC-dex), an intravascular indicator, and coenzyme Q1 hydroquinone (CoQ1H2), a compound which rapidly equilibrates between blood and tissue on passage through the pulmonary circulation, were measured following their bolus injection into the pulmonary artery of isolated perfused lungs from rats exposed to room air (normoxic) or 85% O2 for 7 days (hyperoxic). The moments (mean transit time and variance) of the measured FITC-dex and CoQ1H2 outflow curves were determined for each lung, and were then used in a mathematical model [Audi et al. J. Appl. Physiol. 77: 332–351, 1994] to estimate t¯c and the relative dispersion (RDc) of h c(t). Data analysis reveals that exposure to hyperoxia decreases lung t¯c by 42% and increases RDc, a measure h c(t) heterogeneity, by 40%
Deformation Projected RMF Calculation for Cr and Fe nuclei in Hybrid Derivative Coupling Model
The ground state properties of even mass Cr and Fe isotopes are studied using
the generalized hybrid derivative coupling model. The energy surface of each
isotope is plotted as a function of the mass quadrupole moment. The neutron
numbers N=20 and N=40 are seen to remain magic numbers but N= 28 and 50 are
predicted to be non-magic. The neutron number N=70 turns out to be a magic
number according to the present calculation. In all the isotopes studied the
calculated binding energy values are less than those obtained from experiment
while the deformation is in better agreement.Comment: To appear in Int. Jour. Mod. Phys.
Pengaruh Kompensasi Dan Motivasi Terhadap Prestasi Kerja Karyawan PT. Bank Sahabat Purba Danarta Kantor Pusat Semarang
Work performance is a very desirable outcome, either by employees or the workers themselves and the company. Compensation and Motivation has been found to increase employee performance. Therefore, two things need to be considered by the company in order to improve work performance. PT. Bank Sahabat Purba Danarta Pusat Semarang is one of the banks engaged in microfinance and has a new policy is to recruit staff on a large scale, but have not been able to realize the given target. The purpose of this reseacrh are: (a) To find there is an effect of compensation to work performance at PT. Bank Sahabat Purba Danarta. (b) To find there is an effect of motivation to work performance at PT. Bank Sahabat Purba Danarta. (c) To find there is an effect of compensation and motivation to work performance at PT. Bank Sahabat Purba Danarta. This research type is explanatory research to the 39 respondents to the census approach. Data collection techniques in this study using interview techniques, by means of questionnaires and literature study. The data obtained were analyzed qualitatively and quantitatively using analytical tools such as cross tables, test validity, reliability testing, simple linear regression, multiple linear regression and hypothesis testing with the t test and F test. The conclusion of this study is that there is a positive effect between compensation and motivation of the employees\u27 performance of PT Bank Sahabat Purba Danarta kantor Pusat Semarang. The higher compensation and motivation of the employees\u27 work performance will increase, and vice versa. Suggestions for increasing employees\u27 work performance for the company to increase its attention to compensation and motivation that will ultimately improve the work performance of employees
Thomas-Ehrman shifts in nuclei around ^{16}O and role of residual nuclear interaction
The asymmetry in the energy spectra between mirror nuclei (the Thomas-Ehrman
shifts) around O is investigated from a phenomenological viewpoint. The
recent data on proton-rich nuclei indicates that the residual nuclear
interaction is reduced for the loosely bound s-orbit by as much as 30%, which
originates in the broad radial distribution of the proton single-particle wave
function.Comment: to appear in Phys. Lett. B, with 3 eps figure
Kajian Kerentanan Fisik, Sosial, dan Ekonomi Pesisir Samas Kabupaten Bantul terhadap Erosi Pantai
Pesisir Samas merupakan salah satu objek pariwisata yang memiliki infrastruktur yang rentan terancam keberlanjutan perkembangannya jika erosi pantai tidak segera diatasi. Penelitian ini bertujuan untuk mengkaji tingkat kerentanan dan mengkaji kapasitas masyarakat dalam menghadapi erosi pantai di Daerah Kepesisiran Samas. Penilaian kerentanan wilayah dilakukan dengan metode SMCE dan penilaian kerentanan di tingkat rumah tangga dilakukan dengan metode pengharkatan. Penilaian tingkat kapasitas masyarakat dilakukan menggunakan metode skoring hasil wawancara terstruktur. Hasil penilaian kerentanan wilayah menunjukkan bahwa pada ketiga skenario yaitu skenario fisik, sosial ekonomi, dan equal memiliki nilai yang sama yang menunjukkan bahwa Desa Srigading memiliki nilai kerentanan yang lebih tinggi daripada Desa Gadingsari. Hasil penilaian kerentanan rumah tangga pada parameter fisik, sosial, dan ekonomi secara berurutan menunjukkan 50%, 8,93%, dan 46,43% rumah tangga memiliki tingkat kerentanan tinggi. Hasil penilaian kapasitas masyarakat menunjukkan penduduk di Daerah Kepesisiran Samas memiliki tingkat kapasitas yang tergolong sedang
Deformed Hartree-Fock Calculation of Proton-Rich Nuclei
We perform Hartree-Fock+BCS calculations for even-even nuclei with 2 <= Z <=
82 and N ranging from outside the proton drip line to the experimental frontier
on the neutron-rich side. The ground state solutions are obtained for 737
nuclei, together with shape-coexistence solutions for 480 nuclei. Our method
features the Cartesian-mesh representation of single-particle wavefunctions,
which is advantageous in treating nucleon skins and exotic shapes. The results
are compared with those of the finite-range droplet model of Moller et al. as
well as the experimental values.Comment: 7 pages Latex, 5 postscript figures appended as uufil
Modified Bethe-Weizsacker mass formula with isotonic shift and new driplines
Nuclear masses are calculated using the modified Bethe-Weizsacker mass
formula in which the isotonic shifts have been incorporated. The results are
compared with the improved liquid drop model with isotonic shift. Mass excesses
predicted by this method compares well with the microscopic-macroscopic model
while being much more simple. The neutron and proton drip lines have been
predicted using this modified Bethe-Weizsacker mass formula with isotonic
shifts.Comment: 9 pages including 2 figure
Fission Cycling in Supernova Nucleosynthesis: Active-Sterile Neutrino Oscillations
We investigate nucleosynthesis in the supernovae post-core bounce
neutrino-driven wind environment in the presence of active-sterile neutrino
transformation. We consider active-sterile neutrino oscillations for a range of
mixing parameters: vacuum mass-squared differences of 0.1 eV^2 < dm^2 < 100
eV^2, and vacuum mixing angles of sin^2(2 theta_v) > 10^-4. We find a
consistent r-process pattern for a large range of mixing parameters that is in
rough agreement with the halo star CS 22892-052 abundances and the pattern
shape is determined by fission cycling. We find that the allowed region for the
formation of the r-process peaks overlaps the LSND and NSBL (3+1) allowed
region.Comment: 11 pages, 7 figures, Corrected Typo
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