Diagnosis and treatment of bubbles in glass production using a numerical Simulator

Α methodology to evaluate the bubble removing Performance of a tank furnace was proposed in previous papers. Since the operating data of the furnace being used for actual production can be udlized to examine the effectiveness of the above proposal, this paper deals with the verification issue when this methodology is applied to a real furnace. Additionally, various indirect indices, which have been advocated to evaluate the bubble removing Performance, are compared with the proposed direct Simulation. The results show that the phenomena experienced in the factory can be clearly explained and the direct Simulation has been proved to be very useful to diagnose and to treat bubbles during actual producdon

Evaluation of bubble removing Performance in a TV glass furnace : Part 2. Verification using real furnace data

In part 2, a furnace for melting TV panel glass is studied to examine the effectiveness of the Simulator developed by the authors. Because panel glass is used as a part of a cathodic ray tube where the TV image is projected and its defect is easily recognizable, bubble-free glass quality is defmitely required. If the bubble quality becomes worse, a heap of rejected products is piled up, which leads to tremendous economical loss. In order to avoid such trouble designing and operating a TV glass furnace and inspecting glass quality are conducted with great care, and therefore, lots of field data have been accumulated so far. Accordingly, it is meaningful to utilize a TV glass furnace to verify the effectiveness of such simulating technology. The values and phenomena predicted by the Simulator and the data having been observed in real furnaces were found to be in reasonable agreement. Therefore, it may be concluded that the proposed Simulator is useful as a method of scale-up and trouble-shooting for glass furnaces

Evaluation of bubble removing Performance in a TV glass furnace : Part 1. Mathematical formulation

The bubble evolution and dissolution process in a glass furnace is an extremely complicated physico-chemical phenomenon. Most of the huge number of bubbles, generated in molten glass during the decomposition of the glass batch, are removed during the trajectory from the charging end to the forming section, but some remain in fmal products. On the basis of the two mechanisms, flotation and absorption, in the bubble removing process, a numerical Simulator was developed to evaluate the influence of first, glass and batch composition, including refining agents, second, geometrical tank design and third, furnace operating conditions upon the bubble quality in products. In particular, the Simulator enabled the estimation of the effect of refining gases which are caused by decomposition of the refining agents. Furthermore, an index was devised to synthetically assess the numbers of bubbles in final products. In part 1, the principles of the model which composes the Simulator are described in mathematical formulation. The basic equations with boundary conditions and calculation procedures for thermal flow of molten glass, gas concentration in glass melt and gas evolvement from the refining agents are presented. The calculation strategy of the bubble removing process is also described

Evaluation of reaction rate of refining agents

To elucidate the thermal decomposition behavior of antimony oxide which is added to promote (re)fming of bubbles in TV glass, an evolved gas analysis (EGA) was conducted using a newly designed device for detecting the gases from the glass batch at increasing temperatures. Furthermore, a mathematical formulation was made to describe the above behavior. From the results of the EGA measurements, three parameters, which govern the reaction rate constant, viz. reaction order, activation energy and frequency factor, were decided. By coupling this mathematical model and the thermal fluid model of glass melts in tank furnaces, it is possible to simulate the conditions of generating refming oxygen in the furnace

Design Study of CANGAROO-III, Stereoscopic Imaging Atmospheric Cherenkov Telescopes for sub-TeV Gamma-ray

CANGAROO-III is an Imaging Atmospheric Cherenkov Telescope (IACT) array of four 10 m telescopes for very high energy (sub-TeV) gamma-ray astronomy. A design study of the CANGAROO-III telescope system was carried out using the Monte Carlo technique in order to optimize the pixel size and the telescope spacing. Studies were also made of observations at low elevation angles.Comment: 17pages, 13 figures, elsart, to appear in Astro. Part. Phy

Detection of Gamma-rays around 1TeV from RX J0852.0-4622 by CANGAROO-II

We have detected gamma-ray emission at the 6sigma level at energies greater than 500GeV from the supernova remnant RX J0852.0-4622 (G266.2-1.2) using the CANGAROO-II Imaging Atmospheric Cherenkov Telescope (IACT). The flux was 0.12 times of that of Crab at 1TeV. The signal centroid is consistent with the peak of the X-ray emission in the north-west rim of the remnant.Comment: 12pages, 4figures, to be published in ApJ

A Search for TeV Gamma-ray Emission from the PSR B1259-63/SS2883 Binary System with the CANGAROO-II 10-m Telescope

Observations of the PSR B1259-63/SS2883 binary system using the CANGAROO-II Cherenkov telescope are reported. This nearby binary consists of a 48msec radio pulsar in a highly eccentric orbit around a Be star, and offers a unique laboratory to investigate the interactions between the outflows of the pulsar and Be star at various distances. It has been pointed out that the relativistic pulsar wind and the dense mass outflow of the Be star may result in the emission of gamma rays up to TeV energies. We have observed the binary in 2000 and 2001, 47 and 157 days after the October 2000 periastron. Upper limits at the 0.13--0.54 Crab level are obtained. A new model calculation for high-energy gamma-ray emission from the Be star outflow is introduced and the estimated gamma-ray flux considering Bremsstrahlung, inverse Compton scattering, and the decay of neutral pions produced in proton-proton interactions, is found to be comparable to the upper limits of these observations. Comparing our results with these model calculations, the mass-outflow parameters of the Be star are constrained.Comment: 29 pages, 10 figures, accepted by Ap

コウオン ガラス ヨウカイ ニ オケル キホウ ジョキョ プロセス ニ カンスル ケンキュウ

京都大学0048新制・論文博士博士(工学)乙第10942号論工博第3666号新制||工||1245(附属図書館)UT51-2002-G516(主査)教授 横尾 俊信, 教授 小久保 正, 教授 川崎 昌博学位規則第4条第2項該当Doctor of EngineeringKyoto UniversityDA

腎摘時の脾外傷に対する後腹膜化による修復

50歳女性の左腎細胞癌摘出術中に脾外傷を経験した.その際に, 脾の裂創部を縫合したが止血は十分でなかった.そこでその出血部を圧迫する目的で脾を腎摘後の後腹膜腔に移動した.この脾臓の後腹膜化により十分な止血効果が得られた.術後6ヵ月のCTにても脾の萎縮, 血腫などを認めていない.経腹式腎摘の際経験する脾外傷に対して, 圧迫止血可能な場合は, 脾を後腹膜腔に移動することにより, 手早く簡単に修復が可能であった.During intraperitoneal nephrectomy, the spleen may be injured inadvertently. Splenic salvage is mandatory in this situation; however, it requires some skill and extra time to control the bleeding. The authors present a very simple technique to replace the organ and retroperitonealize it in the nephrectomized fossa after some suture ligations have been placed in the major bleeding site

根治術施行後の組織欠損部の修復に筋肉皮弁を用いた進行性陰茎癌の1症例

55歳男性に発症した陰茎扁平上皮癌Stage C (T3N3M0)に対し根治的手術を施行した.鼠径部を含めた広範な皮膚切除および全除精術を施行し, 鼠径部および骨盤内リンパ節廓清もおこなった.会陰部に尿道瘻を造設し, 両側大腿筋膜張筋筋肉皮弁を作製しこれを用い皮膚欠損部の再建術を施行した.術直後よりペプロマイシン単独投与しその後サイクロフォスファマイド, アドリアシン, シスプラチンを用いた多剤併用化学療法を3コース施行, 同時に骨盤部に対し総線量5, 000 radの放射線療法をおこなった.術後12ヵ月を経過した現在, 再発転移を認めず, 歩行起立障害も軽度となったA 55-year-old male with penile epidermoid carcinoma of stage C (T3N3N0) underwent radical surgery. Emasculation with profuse skin removal, including the bilateral groins, and inguinal and pelvic lymphadenectomy were performed. A urethrostomy was created at the perineum, and the skin defect was covered with tensor fascia lata myocutaneous skin flaps. Immediately after recovery from surgery, 3 cycles of chemotherapy with cyclophosphamide, adriamycin and CDDP and radiation (5, 000 rad) of the local area were given. The patient is now free from tumor recurrence 12 months after the surgery