9,438 research outputs found
On the Electronic Energy of a One-electron Diatomic Molecule near the United Atom
Electric energy behavior for ground state of one-electron heteronuclear diatomic molecule near united ato
The Complex‐Heterozygotes of Oenothera grandiflora L'Her.
Complex‐heterozygotes discovered in populations of O. grandiflora in Alabama are composed of a typical grandiflora (B) complex and an altered B complex which modifies the phenotype in the direction of O. villosa (A). A cytogenetic analysis of the new complex, designated B A , is reported including results of its compatibility with different plastomes. The evidence suggests that the B A complex resulted from hybridization between O. grandiflora and the pollen complex of the sympatric O. biennis .Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/106067/1/j.1438-8677.1992.tb00316.x.pd
Appropriate Serological Testing in Pregnancy
Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/72557/1/j.1423-0410.1992.tb01243.x.pd
Neutron star mass and radius measurements from atmospheric model fits to X-ray burst cooling tail spectra
Observations of thermonuclear X-ray bursts from accreting neutron stars (NSs)
in low-mass X-ray binary systems can be used to constrain NS masses and radii.
Most previous work of this type has set these constraints using Planck function
fits as a proxy: both the models and the data are fit with diluted blackbody
functions to yield normalizations and temperatures which are then compared
against each other. Here, for the first time, we fit atmosphere models of X-ray
bursting NSs directly to the observed spectra. We present a hierarchical
Bayesian fitting framework that uses state-of-the-art X-ray bursting NS
atmosphere models with realistic opacities and relativistic exact Compton
scattering kernels as a model for the surface emission. We test our approach
against synthetic data, and find that for data that are well-described by our
model we can obtain robust radius, mass, distance, and composition
measurements. We then apply our technique to Rossi X-ray Timing Explorer
observations of five hard-state X-ray bursts from 4U 1702-429. Our joint fit to
all five bursts shows that the theoretical atmosphere models describe the data
well but there are still some unmodeled features in the spectrum corresponding
to a relative error of 1-5% of the energy flux. After marginalizing over this
intrinsic scatter, we find that at 68% credibility the circumferential radius
of the NS in 4U 1702-429 is R = 12.4+-0.4 km, the gravitational mass is
M=1.9+-0.3 Msun, the distance is 5.1 < D/kpc < 6.2, and the hydrogen mass
fraction is X < 0.09.Comment: 15 pages, 11 figures, submitted to A&
Cytological analysis of complex-heterozygotes in populations of Oenothera grandiflora ( Onagraceae ) in Alabama
Genetic analysis of unusual complex-heterozygous genotypes in populations of O. grandiflora from Alabama (USA) has shown that these strains are composed of a typical grandiflora (B) complex and an altered B complex (designated as B A ) which probably contains genetic elements derived from an A genotype such as the beta complex of O. biennis group 1. Analysis of the meiotic configurations of artificial hybrids between the new strains and a series of complexes of known segmental arrangement allowed determination of the arrangements of the unknown complexes. These data are evidence for origin of the altered B complexes.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/41635/1/606_2004_Article_BF00937779.pd
Прогнозирование прочности стальных труб, поврежденных водной коррозией
Показана возможность прогноза долговечности поврежденных стальных труб. Вследствие
электрохимического взаимодействия металла и воды образуются щелеобразные коррозионные
дефекты, которые являются концентраторами напряжений и приводят к локальному
перенапряжению материала и разрушению труб. Долговечность труб рассчитывается по
скорости роста коррозионных дефектов и степени концентрации напряжений. С повышением
температуры скорость электрохимической коррозии увеличивается, что приводит к
снижению долговечности труб.Показана можливість прогнозування довговічності пошкоджених сталевих
водопровідних труб. Внаслідок електрохімічної взаємодії металу і води
виникають щілиноподібні корозійні дефекти, що є концентраторами напружень
і зумовлюють локальну перенапругу матеріалу та руйнування труб.
Довговічність труб розраховується по швидкості росту корозійних дефектів
і ефективності концентрації напружень. Із підвищенням температури швидкість
електрохімічної корозії збільшується, що призводить до зниження
довговічності труб.We have demonstrated a possibility of predicting
service life of damaged steel pipes. The
electrochemical interaction of the metal and water
causes initiation of crack-like corrosive defects,
which, being stress concentrators, induce
local overstressing of the material and destruction
of pipes. One can calculate the durability
of a pipe from the corrosion crack-growth rate
and the degree of the stress concentration. An
increase in temperature accelerates electrochemical
corrosion, which results in the reduction of
life of water pipes
The Statistical Multifragmentation Model with Skyrme Effective Interactions
The Statistical Multifragmentation Model is modified to incorporate the
Helmholtz free energies calculated in the finite temperature Thomas-Fermi
approximation using Skyrme effective interactions. In this formulation, the
density of the fragments at the freeze-out configuration corresponds to the
equilibrium value obtained in the Thomas-Fermi approximation at the given
temperature. The behavior of the nuclear caloric curve at constant volume is
investigated in the micro-canonical ensemble and a plateau is observed for
excitation energies between 8 and 10 MeV per nucleon. A kink in the caloric
curve is found at the onset of this gas transition, indicating the existence of
a small excitation energy region with negative heat capacity. In contrast to
previous statistical calculations, this situation takes place even in this case
in which the system is constrained to fixed volume. The observed phase
transition takes place at approximately constant entropy. The charge
distribution and other observables also turn out to be sensitive to the
treatment employed in the calculation of the free energies and the fragments'
volumes at finite temperature, specially at high excitation energies. The
isotopic distribution is also affected by this treatment, which suggests that
this prescription may help to obtain information on the nuclear equation of
state
1975 commercial grape spray schedule
"MP 263, 2/75/1.5M"PRE-BLOOM SPRAYS -- BLOOM SPRAYS -- POST-BLOOM SPRAYS -- SUMMER SPRAYSBy W.R. Enns and W.S. Craig (Department of Entomology), A.E. Gaus (Department of Horticulture) and P.W. Steiner, H.W. Shaffer, and E.W. Palm (Department of Plant Pathology
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