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NOTES ON VANISHING THEOREMS ON RIEMANNIAN MANIFOLDS WITH BOUNDARY
Kitahara, Haruo,Pak, Hong-Kyung Korean Mathematical Society 1998 대한수학회지 Vol.35 No.4
We shall discuss on some vanishing theorems of harmonic sections of a Riemannian vector bundle over a compact Riemannian manifold with boundary. In relating the results of H. Donnelly - P. Li ([4]), for special case of harmonic forms satisfying absolute or relative boundary problem, our results improve the vanishing results of T. Takahashi ([9]).
A Note on Harmonic Forms on a Contact Manifold
Haruo Kitahara,Hong Kyung Pak 경북대학교 자연과학대학 수학과 2003 Kyungpook mathematical journal Vol.43 No.1
We study the harmonic theory on a contact manifold in terms of the canonical measure associated to the contact form.
Dielectric Characteristics of the Water Solutions of Ethanol in the Terahertz Region
Hideaki Kitahara,Keisuke Mano,Mitsuo Wada Takeda,Seiji Kojima,Seizi Nishizawa,Takuma Yagi 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.1
To investigate the dielectric properties of water solutions, we fabricated a liquid-sample holder for THz-TDS and developed a software program to analyze the complex dielectric constant of a liquid. Transmission spectra were measured for a water solution of ethanol, and the complex dielectric constant was analyzed by using a Debye model of three terms. Turning points in the relaxation times at concentrations of 8, 20, and 40 mol% were observed.
A Note on Harmonic Forms on a Contact Manifold
Haruo Kitahara...et al KYUNGPOOK UNIVERSITY 2003 Kyungpook mathematical journal Vol.43 No.2
We study the harmonic theory on a contact manifold in terms of the canonical measure associated to the contact form.
On a Connection on Contact and Hypercontact Manifolds
H. KITAHARA,JIN SUK PAK 경북대학교 자연과학대학 수학과 2002 Kyungpook mathematical journal Vol.42 No.1
In this paper we investigate some geometric properties of the product connection due to I. Vaisman for a contact structure and hypercontact structure from the viewpoint of Riemannian foliation and rewrite some results about those structures in 1970's by using this connection.
Ren, Yan,Kitahara, Cari Meinhold,de Gonzalez, Amy Berrington,Clero, Enora,Brindel, Pauline,Maillard, Stephane,Cote, Suzanne,Dewailly, Eric,Rachedi, Frederique,Boissin, Jean-Louis,Sebbag, Joseph,Shan, Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.13
Background: Numerous studies have suggested that selenium deficiency may be associated with an increased risk for several types of cancer, but few have focused on thyroid cancer. Materials and Methods: We examined the association between post-diagnostic fingernail selenium levels and differentiated thyroid cancer risk in a French Polynesian matched case-control study. Conditional logistic regression models were used to estimate odds ratios and 95% confidence intervals. Results: The median selenium concentration among controls was $0.76{\mu}g/g$. Significantly, we found no association between fingernail selenium levels and thyroid cancer risk after conditioning on year of birth and sex and additionally adjusting for date of birth (highest versus lowest quartile: odds-ratio=1.12, 95% confidence interval: 0.66-1.90; p-trend=0.30). After additional adjustment for other covariates, this association remained non-significant (p-trend=0.60). When restricting the analysis to thyroid cancer of 10 mm or more, selenium in nails was non-significantly positively linked to thyroid cancer risk (p-trend=0.09). Although no significant interaction was evidenced between iodine in nails and selenium in nails effect (p=0.70), a non-significant (p-trend =0.10) positive association between selenium and thyroid cancer risk was seen in patients with less than 3 ppm of iodine in nails. The highest fingernail selenium concentration in French Polynesia was in the Marquises Islands ($M=0.87{\mu}g/g$) and in the Tuamotu-Gambier Archipelago ($M=0.86{\mu}g/g$). Conclusions: Our results do not support, among individuals with sufficient levels of selenium, that greater long-term exposure to selenium may reduce thyroid cancer risk. Because these findings are based on post-diagnostic measures, studies with prediagnostic selenium are needed for corroboration.