964 research outputs found
A composition transferable and time-scale consistent coarse-grained model for cis-polyisoprene and vinyl-polybutadiene oligomeric blends
Degenerate Four Virtual Soliton Resonance for KP-II
By using disipative version of the second and the third members of AKNS
hierarchy, a new method to solve 2+1 dimensional Kadomtsev-Petviashvili (KP-II)
equation is proposed. We show that dissipative solitons (dissipatons) of those
members give rise to the real solitons of KP-II. From the Hirota bilinear form
of the SL(2,R) AKNS flows, we formulate a new bilinear representation for
KP-II, by which, one and two soliton solutions are constructed and the
resonance character of their mutual interactions is studied. By our bilinear
form, we first time created four virtual soliton resonance solution for KP-II
and established relations of it with degenerate four-soliton solution in the
Hirota-Satsuma bilinear form for KP-II.Comment: 10 pages, 5 figures, Talk on International Conference Nonlinear
Physics. Theory and Experiment. III, 24 June-3 July, 2004, Gallipoli(Lecce),
Ital
Methane Mitigation and Microbial Diversity of Silage Diets Containing Calliandra calothyrsus in a Rumen in Vitro Fermentation System
This study was conducted to investigate the effects of silage based diets on methane (CH4) mitigation and microbial diversity in a rumen in vitro fermentation. The experiment was arranged in a completely randomized design with five treatments and three replications. The dietary treatments consisted of varying levels of silage containing 50% Calliandra calothyrsus as follows K; 100% concentrate + pure tannic acid of 1 mg/mL, R1; 25% silage + 75% concentrate, R2; 50% silage + 50% concentrate, R3; 75% silage + 25% concentrate, and R4; 100% silage. The fermentation variables measured were total gas, CH4, in vitro organic matter digestibility (IVOMD), VFAs, pH, N-NH3, number of protozoa, and microbial diversity analysis. Increasing level of silages reduced total gas production, CH4 concentration, IVOMD, index of bacterial diversity, protozoal number, total methanogens and Methanobacteriales population. Diet with 25% to 50% silage decreased CH4 concentration, total gas production and IVOMD by 11.43%, 24.92%, and 18.73%, respectively. Ammonia N and VFAs (except butyrate and valerate) were significantly reduced (
The Gordon-Haus effect for modified NLS solitons
Random jitter in the soliton arrival time (the Gordon-Haus effect) is
analyzed for solitons being solutions of the integrable modified nonlinear
Schroedinger equation. It is shown that the mean square fluctuation of the
soliton position depends on the soliton parameters which can be properly
adjusted to suppress the Gordon-Haus jitter.Comment: LaTeX, 7 pages, 3 figures, to be published in Europhys. Let
New magnetic intermediate state, "B - phase, " in the cubic chiral magnet MnSi
It is well known that the archetype chiral magnet MnSi stabilizes a skyrmion lattice, termed "A-phase, "in a narrow temperature range in the vicinity of the paramagnetic boundary around Tc ~29 K and Hc ~2 kOe. Recently, it has been predicted that at much lower temperatures below Tc, the conical helicoid and the forced ferromagnetic (FFM) states could be separated by a new "unknown state."In order to detect this "unknown state, "we explored the phase diagram of MnSi oriented single crystals as a function of the d.c. magnetic field (H - dc) and the temperature (T) by using a.c. magnetization measurements. For H - dc¿ , we observed a new region, termed "B-phase, "in the magnetic phase diagram, characterized by a flat-valley-like anomaly on the in-phase component of the a.c. magnetization (m'), over 3.5 = Hdc = 6.2 kOe just below the low temperature (T or , revealing that the magnetic anisotropy could play a role in the stabilization of the phase. The "B-phase"could be compatible with the theoretical predictions if the new magnetic state is supposedly related with a relative reorientation of the four helices in MnSi
Factorization methods for Noncommutative KP and Toda hierarchy
We show that the solution space of the noncommutative KP hierarchy is the
same as that of the commutative KP hierarchy owing to the Birkhoff
decomposition of groups over the noncommutative algebra. The noncommutative
Toda hierarchy is introduced. We derive the bilinear identities for the
Baker--Akhiezer functions and calculate the -soliton solutions of the
noncommutative Toda hierarchy.Comment: 7 pages, no figures, AMS-LaTeX, minor corrections, final version to
appear in Journal of Physics
Precise Wavelength Determination of 48-μm CH3OD Laser Line Using Refractive Index Measurement Method of Optical Etalon
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