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High-field Multi-frequency ESR in the S=2 Heisenberg Antiferromagnetic Chain Compound MnCl3(bpy)
Masayuki Hagiwara,Masami Ikeda,Yuichi Idutsu,Shojiro Kimura,Zentaro Honda 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
We report the results of high-field multi-frequency electron spin resonance (ESR) experimentson a powder sample of MnCl3 (bpy) (bpy=2, 2’-bipyridine). This compound is one of the rareexamples of the spin (S) 2 quasi one-dimensional (1D) Heisenberg antiferromagnets (HAFs), andmagnetic properties of tiny single crystal samples were reported previously (G. E. Granroth et al.,Phys. Rev. Lett. 77, 1616 (1996).). In our previous paper on this compound (M. Hagiwara et al.,J. Phys.: Conf. Ser. 400, 032014 (2012).), we reported, for the S=2 1D HAF, good agreementbetween experiment and calculation for the temperature dependence of magnetic susceptibility andthe high-field magnetization process at 1.3 K. In this work, we have observed some high-frequencyresonance modes with zero-field gaps of about 800 GHz that may correspond to antiferromagneticresonance modes with orthorhombic anisotropy in a long-range-ordered phase that emerged at lowtemperatures above the critical field at which the energy gap (Haldane gap) closes. The single-ionanisotropy constant D evaluated from the analysis of these ESR modes is larger than that reportedpreviously.
CURRENT STATUS OF THE EAVN EXPERIMENTS
HAGIWARA, YOSHIAKI,AN, TAO,JUNG, TAEHYUN,RHO, DUK-GYOO,ZHANG, MING,HAO, LONGFEI,FUJISAWA, KENTA,YONEKURA, YOSHINORI,BAAN, WILLEM,KIM, JONGSOO,KOBAYASHI, HIDEYUKI The Korean Astronomical Society 2015 天文學論叢 Vol.30 No.2
VLBI experiments have been conducted by radio telescopes in the East Asia VLBI Network (EAVN) in which 14 telescopes in China, Japan, and Korea participated. One of the aims of the EAVN is to obtain higher angular resolution that is provided by the 6,000 km baseline between China and Japan and better sensitivity by adding large telescopes. Data were recorded at 1 a Gbps recording rate at all stations and processed on the Korea-Japan Joint VLBI Correlator (KJJVC) at the Korea-Japan Correlation Center (KJCC) after experiments. Fringes were obtained from these experiments conducted at 8 GHz and 22 GHz and post-correlation data analysis of the experiments is undergoing. The outcomes of these experiments open the possibility of conducting EAVN observations with global VLBI networks. In this presentation, the recent status of these experiments and future prospects are presented.
Solving the neutrino parameter degeneracy by measuring the T2K off-axis beam in Korea
Hagiwara, Kaoru,Okamura, Naotoshi,Senda, Ken-ichi Elsevier 2006 Physics letters: B Vol.637 No.4
<P><B>Abstract</B></P><P>The T2K neutrino oscillation experiment will start in 2009. In this experiment the center of the neutrino beam from J-PARC at Tokai village will go through underground beneath Super-Kamiokande, reach the sea level east of Korean shore, and an off-axis beam at 0.5° to 1.0° can be observed in Korea. We study physics impacts of putting a 100 kt-level water Čerenkov detector in Korea during the T2K experimental period. For a combination of the 3° off-axis beam at SK with baseline length L=295 km and the 0.5° off-axis beam in the east coast of Korea at L=1000 km, we find that the neutrino mass hierarchy (the sign of m32−m12) can be resolved and the CP phase of the MNS unitary matrix can be constrained uniquely at 3<I>σ</I> level when <SUP>sin2</SUP>2<SUB>θrct</SUB>≳0.06.</P>
Graviton production with 2 jets at the LHC in large extra dimensions
Hagiwara, Kaoru,Konar, Partha,Li, Qiang,Mawatari, Kentarou,Zeppenfeld, Dieter IOP Publishing Ltd 2008 Journal of high energy physics Vol.2008 No.4
We study Kaluza-Klein (KK) graviton production in the large extra dimensions model via 2 jets plus missing transverse momentum signatures at the LHC. We make predictions for both the signal and the dominant <I>Zjj</I> and <I>Wjj</I> backgrounds, where we introduce missing <I>P</I><SUB><I>T</I></SUB>-dependent jet selection cuts that ensure the smallness of the 2-jet rate over the 1-jet rate. With the same jet selection cuts, the distributions of the two jets and their correlation with the missing transverse momentum provide additional evidence for the production of an invisible massive object.
Hagiwara, Kaoru,Ko, Pyungwon,Okamura, Naotoshi,Takaesu, Yoshitaro Springer-Verlag 2017 The European physical journal. C, Particles and fi Vol.77 No.3
<P>We revisit the sensitivity study of the Tokaito- Kamioka-and-Korea (T2KK) and Tokai-to-Kamioka-andOki (T2KO) proposals where a water Cerenkov detector with the 100 kton fiducial volume is placed in Korea (L = 1000 km) and Oki island (L = 653 km) in Japan, respectively, in addition to the Super-Kamiokande for determination of the neutrino mass hierarchy and leptonic CP phase (delta(CP)). We systematically study the running ratio of the nu(mu) and (nu) over bar (mu) focusing beams with dedicated background estimation for the nu(e) appearance and nu(mu) disappearance signals, especially improving treatment of the neutral-current pi(0) backgrounds. Using a nu(mu)-(nu) over bar (mu) beam ratio between 3: 2 and 2.5: 2.5 (in units of 10(21)POT with the proton energy of 40 GeV), the mass-hierarchy determination with the median sensitivity of 3-5 sigma by the T2KK and 1-4 sigma by the T2KO experiment are expected when sin(2) theta(23) = 0.5, depending on the mass-hierarchy pattern and CP phase. These sensitivities are enhanced (reduced) by 30-40% in Delta chi(2) when sin(2) theta(23) = 0.6 (0.4). The CP phase is measured with the uncertainty of 20 degrees-50 degrees by theT2KKandT2KOusing the nu(mu)-(nu) over bar (mu) focusing beam ratio between 3.5: 1.5 and 1.5: 3.5. These findings indicate that inclusion of the (nu) over bar mu focusing beam improves the sensitivities of the T2KK and T2KO experiments to both the mass-hierarchy determination and the leptonic CP phase measurement simultaneously with the preferred beam ratio being between 3: 2-2.5: 2.5 (x10(21)POT).</P>
Proton Pump Inhibitors and Helicobacter Pylori-Associated Pathogenesis
Hagiwara, Tadashi,Mukaisho, Ken-Ichi,Nakayama, Takahisa,Hattori, Takanori,Sugihara, Hiroyuki Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.4
The fact that long-term use of proton pump inhibitors (PPIs) aggravates corpus atrophic gastritis in patients with Helicobacter pylori infection has been proven clinically and experimentally. Corpus atrophic gastritis is a known risk factor for gastric cancer. Therefore, gastric neoplasia might be associated with the long-term use of PPIs. One of the causes of worsening corpus atrophic gastritis, leading to the development of adenocarcinoma, might be bacterial overgrowth under conditions of hypochlorhydria. The production of potentially carcinogenic N-nitrosocompounds by nitrosating organisms under conditions of hypochlorhydria might be associated with carcinogenesis. Interactions between bile acids, pH, and H. pylori might also contribute to carcinogenicity, especially in patients with gastro-esophageal reflux disease (GERD). The concentration of soluble bile acids, which have bactericidal or chemorepellent properties toward H. pylori, in gastric contents is considerably higher in patients undergoing continuous PPI therapy than in healthy individuals with normal acid production. Under these circumstances, H. pylori might colonize the stomach body rather than the pyloric antrum. Hypergastrinemia induced by PPI administration might promote the development of gastric cancer. Because the main cause of corpus atrophic gastritis is H. pylori infection, and not PPI administration, H. pylori infection should be eradicated before starting long-term PPI therapy.
Enhanced Mechanical Properties of Orthorhombic Ti₂AlNb-Based Intermetallic Alloy
Hagiwara, M.,Emura, S.,Araoka, A.,Kong, B.O.,Tang, F. 대한금속재료학회 2003 METALS AND MATERIALS International Vol.9 No.3
Attempts were made to improve the mechanical properties of an orthorhombic Ti₂AlNb-based Ti-22Al-27Nb intermetallic alloy through microstructural and compositional modifications, and the dispersion of fine TiB particulates. A Ti-22Al-27Nb alloy with a prior B2 grain size ranging from 8 mm to 49 ㎛ was successfully obtained using spherical α₂particles as obstacles to grain growth. The finest grained material showed an excellent combination of room temperature tensile strength (around 1,000 MPa) and tensile ductility (more than 15 %). Transition metal elements such as Mo, V and W for a portion of the Nb in the Ti-22Al-27Nb were substituted. The guideline for this compositional modification required that the beta phase stability in the modified alloy be equal to that of the Ti-22Al-27Nb. It was found that the substitution of 2 % W for 7 % Nb was quite effective in increasing tensile strength at temperatures above 923 K and reducing the steady state creep rate and primary creep strain. The Ti-22Al-27Nb alloy-based particulate composites reinforced with 6.5 % TiB were successfully produced with the gas atomization P/M method. The dispersion of extremely small TiB was very uniform. Most of the mechanical properties of the composites, including the yield stress, tensile strength, Young's modulus, resistance to creep, and high cycle fatigue strength were greatly superior to those of the matrix alloy.