243 research outputs found
Possibility of Selection for Mineral Concentration in Orchardgrass by X-Ray Microanalysis
To assess the ability of X-ray microanalysis for screening breeding populations of orchardgrass in mineral concentration, correlations between chemical and X-ray analysis were investigated. Six orchardgrass plants with high- and low-Mg concentrations were examined for three harvest dates in 1995. The samples were separated into leaf blade, leaf sheath, culm and head. Mg concentration in leaf and head were higher than in sheath and in culm. P concentration was highest in the head, and lowest in the sheath. Correlations between chemical and X-ray analysis were r=0.692***, 0.526***, 0.252* and 0.562*** for Mg, Ca, K and P, respectively. Correlation coefficients between chemical and X-ray analysis were highest for Mg among 4 minerals. X-ray microanalysis can be used to screen orchardgrass plants for Mg concentration at initial growth stage
Kajian Desain Pola Sirkulasi sebagai Sarana Evakuasi Kebakaran pada Bangunan Igd dan Cot di Rshs Bandung
Public facilities needed to support the health needs of the community as one of them is the Hospital. Hospital is building the groove zone and diverse activities. Building a case study in this research is the Central Operating Theater (COT) and ER (ER) Hasan Sadikin Hospital (RSHS) Bandung, given the activity of the ER and the COT structure is quite high, some users of the building are patients who do not have the ability to evacuate itself when there is a fire, so that the effect is important in designing a good circulation patterns and can be a fire evacuation pathways for patients medics also safe in the event of a fire, and keep a fire evacuation support equipment placed along the evacuation route. Method This study was done by descriptive analysis to determine the building zone and circulation pattern design good, safe evacuation during a fire in a building Central Operating Theater (COT) and ER (ER) RSHS
Activity of Japanese Society of Grassland Science
The Japanese Society of Grassland Science (JSGS) was founded in 1954 for the purposes of progressing grassland and forage crop sciences and fostering grassland agriculture and better management of grassland for animal production in Japan. From the first, the members of JSGS have included interdisciplinary scientists from forage crop science, forestry, animal science, agribusiness and many related fields. In the 50 years since its foundation, JSGS has made large contributions to the progress of both science and industry in Japan. The number of JSGS members is now declining slightly, but there are still about 950 including 800 individual members and 150 organisations or private companies. The profile of the current members is mainly scientists working in university or governmental and private research institutes
Exact spin dynamics of the 1/r^2 supersymmetric t-J model in a magnetic field
The dynamical spin structure factor S^{zz}(Q,omega) in the small momentum
region is derived analytically for the one-dimensional supersymmetric t-J model
with 1/r^2 interaction. Strong spin-charge separation is found in the spin
dynamics. The structure factor S^{zz}(Q,omega) with a given spin polarization
does not depend on the electron density in the small momentum region. In the
thermodynamic limit, only two spinons and one antispinon (magnon) contribute to
S^{zz}(Q,omega). These results are derived via solution of the SU(2,1)
Sutherland model in the strong coupling limit.Comment: 20 pages, 8 figures. Accepted for publication in J.Phys.
Performance of high-magnesium cultivars of three cool-season grasses grown in nutrient solution culture
Breeding for high magnesium (Mg) concentrations pas been conducted
for several forage species. Mgwell, Magnet, and HiMag are the first
experimental strains, bred for increased Mg concentrations of orchardgrass,
Italian ryegrass, and tall fescue, respectively. This experiment
compared the performance and genetic variability of these high-Mg
cultivars grown in solution culture with other cultivars in each species.
Three mineral absorption experiments were carried, out with one month
aged seedlings. Seedlings were evaluated for shoot dry weight, uptake and
concentration of Mg, calcium (Ca), and potassium (K), and also the
density of these minerals in the shoot. The cultivars of different species
behaved differently among the experiments even though the over all
environmental condition was kept similar. The high-Mg cultivars showed
higher Mg uptake per plant, but the differences were not so distinct.
However, the trend in Mg concentration among the cultivars of different
species was similar, and the difference between high-Mg cultivars and
control cultivars was distinct. The Mg density in the shoot of these
cultivars was significantly high. Also the high-Mg cultivars showed lower
equivalent ratio, K/(Ca+Mg). Genotypic differences in high-Mg cultivars
with others could be distinctly explained by differences in Mg
concentration and Mg density in the shoot, which coupled with low
K/(Ca + Mg) ratio. These common properties of high-Mg cultivars might
be considered as a good parameter for screening
Dynamical Properties of the 1/r^2-Type Supersymmetric t-J Model in a Magnetic Field: Manifestation of Spin-Charge Separation
Quasi-particle picture in a magnetic field is pursued for dynamical spin and
charge correlation functions of the one-dimensional supersymmetric t-J model
with inverse-square interaction. With use of exact diagonalization and the
asymptotic Bethe-ansatz equations for finite systems, excitation contents of
relevant excited states are identified which are valid in the thermodynamic
limit. The excitation contents are composed of spinons, antispinons, holons and
antiholons obeying fractional statistics. Both longitudinal and transverse
components of the dynamical spin structure factor are independent of the
electron density in the region where only quasi-particles with spin degrees of
freedom (spinons and antispinons) contribute. The dynamical charge structure
factor does not depend on the spin-polarization density in the region where
only quasi-particles with charge (holons and antiholons) are excited. These
features indicate the strong spin-charge separation in dynamics, reflecting the
high symmetry of the model.Comment: 10 pages, 1 table (PS file), 15 figures (JPEG file). Submitted to J.
Phys. Soc. Jp
Meta-orbital Transition in Heavy-fermion Systems: Analysis by Dynamical Mean Field Theory and Self-consistent Renormalization Theory of Orbital Fluctuations
We investigate a two-orbital Anderson lattice model with Ising orbital
intersite exchange interactions by means of dynamical mean field theory
combined with the static mean field approximation of the intersite orbital
interactions. Focusing on Ce-based heavy-fermion compounds, we examine the
orbital crossover between the two orbital states, when the total f-electron
number per site n_f is n_f ~ 1. We show that a "meta-orbital" transition, at
which the occupancy of the two orbitals changes steeply, occurs when the
hybridization between the ground-state f-electron orbital and conduction
electrons are smaller than that between the excited f-electron orbital and
conduction electrons. Near the meta-orbital critical end point, the orbital
fluctuations are enhanced, and couple with the charge fluctuations. A critical
theory of the meta-orbital fluctuations is also developed by applying the
self-consistent renormalization theory of itinerant electron magnetism to the
orbital fluctuations. The critical end point, first-order transition and
crossover are described within Gaussian approximations of orbital fluctuations.
We discuss the relevance of our results to CeAl2, CeCu2Si2, CeCu2Ge2 and the
related compounds, which all have low-lying crystalline-electric-field excited
states.Comment: 11 pages, 6 figures, J. Phys. Soc. Jpn. 79, (2010) 11471
Dynamical Structure Factors of the Spin-1/2 XXZ Chain with Inverse-Square Exchange and Ising Anisotropy
The dynamical properties of the S=1/2 antiferromagnetic XXZ chain are studied
by the exact diagonalization and the recursion method of finite systems up to
24 sites. Two types of the exchange interaction are considered: one is the
nearest-neighbor type, and the other is the inverse-square one. As the Ising
anisotropy becomes larger, there appears a noticeable difference in the
transverse component S^{xx}(q,\omega) between the two types of the exchange.
For the nearest-neighbor type, the peak frequency of S^{xx}(q,\omega) for each
q approaches the center of the continuum spectrum. On the contrary, the peak
frequency for the inverse-square type moves to the upper edge of the continuum,
and separates from the continuum for the anisotropy larger than the threshold
value. Whether the interaction between domain walls (solitons) is absent or
repulsive in the Ising limit leads to this difference in the behavior of
S^{xx}(q,\omega). In the longitudinal component S^{zz}(q,\omega), on the other
hand, the feature of the dynamics is scarcely different between the two types.
The energy gap and the static properties are also discussed.Comment: 10 pages. A hard copy of 16 figures is available on request.
Submitted to J. Phys. Soc. Jp
Exact dynamical structure factor of the degenerate Haldane-Shastry model
The dynamical structure factor of the K-component (K = 2,3,4)
spin chain with the 1/r^2 exchange is derived exactly at zero temperature for
arbitrary size of the system. The result is interpreted in terms of a free
quasi-particle picture which is generalization of the spinon picture in the
SU(2) case; the excited states consist of K quasi-particles each of which is
characterized by a set of K-1 quantum numbers. Divergent singularities of
at the spectral edges are derived analytically. The analytic
result is checked numerically for finite systems.Comment: 4 pages, 1 figure, accepted for publication in Phys. Rev. Let
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