巻号一覧
後続誌
59 巻, 660 号
選択された号の論文の10件中1～10を表示しています
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宮城 精吉1951 年 59 巻 660 号 p. 233-235
発行日: 1951/06/01
公開日: 2010/04/30
ジャーナル フリーFine powder of metallic silver was mixed with fritt of lead-borate glass and sintered in a mass as Composite material. The thermal expansivities of these composite materials were measured for the purpose of testing the additivity-relationship between expansivity and mixing ratio of silver.
The curve (volume-ratio of silver versus expansivity) did not change linearly with varying volume-ratio of silver, but the curve had two diseontineous points; a point at about 50% and another at about 75%.
The author tried to explain this result with the packing theory of spheres. Another similar experiment was carried out with composed of glass particles and Portland cement.抄録全体を表示PDF形式でダウンロード (467K) -
森谷 太郎, 大河原 晋, 小林 三雄1951 年 59 巻 660 号 p. 236-239
発行日: 1951/06/01
公開日: 2010/04/30
ジャーナル フリー脱水炭酸曹達と無水珪酸との二成分系が温度の上昇によつて起す反應過程は, 無水珪酸の状態によつて本質的に異り, 沈澱無水珪酸 (常温における水分含有率10-20%) の場合には, 二つの成分の調合比如何にかゝわらず200°-800°の間で450°-520°の吸熱, 580°近邊, 620-700°のそれぞれの發熱及び780°附近の吸熱の, 四段階にわたる反應がある。無水珪酸に珪砂を用いる場合には, 上記の温度範圍内で反應は四段階に分れず, 500°-800°の間に全體として大きく緩漫な發熱と, 800°近邊に急激な吸熱の反應を認めたのみであつた。しかしてこれらは何れも, 無水珪酸として沈澱無水珪酸を灼熱して用いたG. TammannおよびW. Oelsenの結果とも相違していた。
終りに臨み本研究の爲に, 熱分析装置の使用を快よくお許し下さつた東京工大山内研究室の吉田博講師に厚く感謝致します。抄録全体を表示PDF形式でダウンロード (588K) -
河島 千尋, 奧田 進1951 年 59 巻 660 号 p. 239-244
発行日: 1951/06/01
公開日: 2010/04/30
ジャーナル フリーThe effects of ultrasonics on the de-airing of gypsum moulds in connection with physical and chemical behaviours, such as the setting time, mechanical strength, hardness, porosity, bulk density, abrasion, hydration and physical structure were studied.
An apparatus, so-called magetostriction type, frequency 14KC/s and power 300 watts was specially designed by Prof. J. Saneyoshi. Calcined natural gypsum from Greek and “Nitto-gypsum” a special quality were used in this experiment.
It was surprizing to find that air bubbles in a gypsum slurry had been eliminated sucsessfully under the action of ultrasonics during few seconds resulting markedly promotion of hydration and increase of mechanical strength, hardness and density of moulds. These results are shown in curves in Fig. 2 to Fig. 4. Microscopic observation indicates the distinct differences of crystal formation showing that more growth of smaller needle-like crystals shown in Fig. 5 and Fig. 6 in the case of a ultrasonic agitation rather than without agitation.
In order to investigate the textures differences of moulds due to the physical and chemical corrosion, permeability of the specimens taken from every parts of wasted gypsum moulds has been measured.抄録全体を表示PDF形式でダウンロード (2056K) -
永井 彰一郎, 關谷 道雄, 梅原 勉1951 年 59 巻 660 号 p. 244-247
発行日: 1951/06/01
公開日: 2010/04/30
ジャーナル フリーTo obtain well-crystallized gypsum crystal (CaSO4.2H2O) for making gypsum plaster (CaSO4.1/2H2O) of high quality, the studies on conversion of anhydrous gypsum (CaSO4.2H2O) were systematically carried out. In the present report, the results of experiments were summarized and reported, as following: (1) Anhydrous gypsum was obtained as byproduct from making hydrogen fluoride by the double decomposition CaF2+H2SO4=HF+CaSO4, (2) Another anhydrous gypsum was obtained by calcining powder of natural crystal gypsum to 400, 700 or 1200°C for 30 minutes CaSO4.2H2O=2H2OCaSO4, (3) These samples of anhy-drous gypsum powder were dipped in 5% solution of various salts of Al-, Fe-, Mn-, K- or Na- and sulphate or nitrate at room temperature for 3, 7, 14, 21 or 28 days, (4) Tbedegree of conversin of the anhydrous CaSO4 to crystal CaSO4. 2H2O was compared by determining the amount of crystal water, (5) The crystal form and size of thus obtained gypsum crystal were strictly compared, (6) Solution of aluminium or iron sulphate [Al2(SO4)3 or Fe2 (SO4)3 gave best results of anhydrous gypsum to large tablet form of gypsum crystal, which can be made by calcining to gypsum plaster of highest quality, and (7) These experiments are now being further continued, which results will be hereafter reported in the next report抄録全体を表示PDF形式でダウンロード (758K) -
大野 良雄, 松岡 徳藏1951 年 59 巻 660 号 p. 248-253
発行日: 1951/06/01
公開日: 2010/04/30
ジャーナル フリー8種の石灰石につきその化學成分・結晶を檢討し, 主として微粗の相異に基く分解の難易, 生石灰の水和反應速度及び石灰乳の沈降速度等につきその結果を述べたがこれを要約するど
(1) 緻密質石灰石は粗粒状石灰石に比し分解容易である。
(2) 生石灰の消化速度は800-1000℃に〓燒されたものは顯著な差異はなく, 1000℃以上では高温になるにつれて遅くなる。又緻密質石灰石の方が幾分消化速度は速いようである。
(3) 石灰乳の沈降速度は1000℃最も遲く微粒であるが温度がこれより上下するにつれて粗粒となる。石灰石の相異による石灰乳の沈降速度には差異は認められない。
なお本試驗に際し終始御指導を賜つた張玄彦博士・赤松常務及び九大應用地質學教室木下龜城教授・牟田邦彦氏に對し深甚の謝意を表すると共に試料の提供を心よく御承引下さつた方々に感謝する次第である。抄録全体を表示PDF形式でダウンロード (1606K) -
設樂 正雄, 岡田 小一1951 年 59 巻 660 号 p. 254-261
発行日: 1951/06/01
公開日: 2010/04/30
ジャーナル フリーWe reported about the heat measurement of Tunnel Kiln for silica brick at Yawata Iron and Steel Work.
I. Arrangement of the Kiln and Working System
We showed the details on the constriction of Tunnel Kiln, and the working systems of the furnace.
II. Outline of the Heat Measurement
We showed about the method of heat measurement.
III. Result of the Heat Measurement
We illustrated about the results of measurement and its diagrams as follows
a) Result of fuel gas analysis and fuel consumption.
b) Consumption of combustion air.
c) Excess air quantity.
d) Consumption of air for cooling.
e) Recovery of the preheated air.
f) Waste gas quantity and its temperature.
g) The temperature distribution of gas and brick in the kiln.
h) The distribution of draft in the kiln.
i) Surface temperatures of the kiln.
j) Quality of manufactured brick etc.
IV. Heat Balance
According to the result of measurement, we carried out the whole heat balance about the Tunnel Kiln and recorded the heat diagrams.
Lastly we appointed the distribution of heat by its flow sheet and showed the efficiency of heat on the Tunnel Kiln.抄録全体を表示PDF形式でダウンロード (1294K) -
岩切 一良1951 年 59 巻 660 号 p. 262-264
発行日: 1951/06/01
公開日: 2010/04/30
ジャーナル フリーPDF形式でダウンロード (598K) -
伊勢 本一郎1951 年 59 巻 660 号 p. 264-265
発行日: 1951/06/01
公開日: 2010/04/30
ジャーナル フリーPDF形式でダウンロード (379K) -
野口 長次1951 年 59 巻 660 号 p. 266-267
発行日: 1951/06/01
公開日: 2010/04/30
ジャーナル フリーPDF形式でダウンロード (856K) -
1951 年 59 巻 660 号 p. 268-269
発行日: 1951/06/01
公開日: 2010/04/30
ジャーナル フリーPDF形式でダウンロード (375K)
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