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京都大学0048新制・課程博士理学博士甲第343号理博第70号新制||理||33(附属図書館)UT51-51-L128京都大学大学院理学研究科化学専攻(主査)教授 後藤 良造, 教授 国近 三吾, 教授 大杉 治郎学位規則第5条第1項該当Kyoto UniversityDFA

Re-calibration of SDF/SXDS Photometric Catalogs of Suprime-Cam with SDSS Data Release 8

We present photometric recalibration of the Subaru Deep Field (SDF) and Subaru/XMM-Newton Deep Survey (SXDS). Recently, Yamanoi et al. (2012) suggested the existence of a discrepancy between the SDF and SXDS catalogs. We have used the Sloan Digital Sky Survey (SDSS) Data Release 8 (DR8) catalog and compared stars in common between SDF/SXDS and SDSS. We confirmed that there exists a 0.12 mag offset in B-band between the SDF and SXDS catalogs. Moreover, we found that significant zero point offsets in i-band (~ 0.10 mag) and z-band (~ 0.14 mag) need to be introduced to the SDF/SXDS catalogs to make it consistent with the SDSS catalog. We report the measured zero point offsets of five filter bands of SDF/SXDS catalogs. We studied the potential cause of these offsets, but the origins are yet to be understood.Comment: 36 pages, 19 figures(128 EPS files), PASJ accepte

The Effect of Cutting Fluids on Reaming Operation

In order to investigate the effect of cutting fluids on reaming operation, reaming tests were performed with various kinds of cutting fluids, and reaming torque and accuracy of reamed holes were compared for dry and wet cuttings. Tests were also made dry and wet for different cutting conditions, and effects of conditions on reaming torque and accuracy of reamed holes were investigated. Application of cutting fluids improved the accuracy of reamed holes, though reaming torque was increased. The cutting torque component was scarcely affected by cutting fluids. But cutting fluids increased the burnishing torque component in the order of dry, cutting oils, and soluble oils. Dry reaming and reaming with cutting oils produced oversized holes. Reaming with soluble oils produced smaller holes than the actual size of the reamer. The smaller the amount of enlargement of the reamed hole, the larger the burnishing torque component, and the better the surface finish in the order of dry, cutting oils, and soluble oils. With increases in cutting speed, feed, and depth of cut, the amount of enlargement increased and the surface finish of the reamed hole became worse for both dry and wet conditions. The sharp reamer showed a peculiar phenomenon for torque pattern in relation to feed rate. The stable reamer which was used several dozen times produced better reamed holes than the sharp reamer

Some aspects of the formation of addition products in the chlorination of polycyclic aromatic compounds

This thesis describes some aspects of the formation of addition products in the chlorination of polycyclic aromatic compounds. The chlorinations of polycyclic hydrocarbons, represented by naphthalene and related compounds, have been investigated mainly from the point of view of adduct formation, and numbers of new addition products derived from those, as well as old ones of still un-known structure, have been clarified with regard to their structures and properties, using infrared, ultra-violet and proton magnetic resonance spectroscopy. As a chlorinating agent, either sulphuryl chloride or mole-cular chlorine has been used, and the electrophilic nature of the former reagent has also been qualitatively established. Naphthalene, alkylnaphthalenes and halonaph-thalenes, when treated with sulphuryl chloride with or without a solvent, give products similar to those obtained with molecular chlorine By heating naphthalenes with sulphuryl chloride in excess, more highly chlorinated addncts were obtained together with some poly-chlorotetralones. Under conditions in which naptha-1mm reacts slowly with sulphuryl chloride, chlorotetralones do not react signif icntly, whereas alkylnaphtha lenes react more rap idly, than naphthalene itself does, and give sd ducts as well as products of eubstitution -Addition of chlorine always occur in the ring, to vJiich the substitution takes place in accordance with the r?ales governing the electrophilic substitution l-ilkylnaphthalenes with straight chain and acenapht hene give side-cbainchlorinated tetrachlorides as the ir.ain addition products. 32he formation of these imsxp acted ad ducts has been explained on the basis of the hyper conmutativo loss of proton during the chlorine addition process Chlorination of naphthols in acetic acid gives various ketopolychlorides, the structures of which have been spectroscopically investigated 2,4-chloro-nsplith-l-ol and related naphth-l-ols of similar structure have been found to involve the initial electrophilic attack on the 2- rather than on the 4-position, giving unstable 1-keto-l,2-dihydronaphthalen:?s which then undergo the anionotropic isomorisation to yield stable 1-keto-l94 dihydronaphthale?es Esters of naphth-l-ols behave differently, depending on the solvents used; in acetic acid the products are similar to those obtained from naphth-l-ols, however, in chloroform, 2,3,4-triehloro-l tetralones are formed, which are not highly stable and gradually lose hydrogen chloride to give 2,4-dichloro-naphth-l-ols. By similar treatment with chlorine, naphthyl-araines readily afford polychlorotetralones, for which a sequence involving the hydrolysis of the intermediary ketimine hydrochlorides has been suggested. Infrared, ultraviolet and proton magnetic resonance spectra of more than forty addition products have been recorded.<p