巻号一覧
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25 巻, 1 号
選択された号の論文の5件中1～5を表示しています
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荒井 豊, 刈谷 亘, 八嶋 三郎1988 年 25 巻 1 号 p. 4-10
発行日: 1988/01/10
公開日: 2010/04/30
ジャーナル フリーThe fracture of optically anisotropic mesophase spherules included in viscous liquefied pitch in a shear field at a high temperature is discussed in this paper. The extent of the fracture of mesophase spherules is characterized by the following two factors: The specific surface area of the fractured product of mesophase spherules and the filtration rate in filter separation of the mesophase spherules from the pitch. A good correlation between each factor and the shear stress caused by flowing through orifices and/or cylindrical tubes is obtained empirically. The mesophase spherules are also found to be fractured at approximately 1.0kPa at comparatively low stress though it is a primary particle. This result shows that the mesophase spherules have an inherent mechanical singularity. Moreover, the friability of the mesophase spherfules may be due to the stacking faults disposed of during the growth of the mesophase.抄録全体を表示PDF形式でダウンロード (2055K) -
諸橋 昭一, 笹倉 寿介, 大井 信一, 八嶋 三郎1988 年 25 巻 1 号 p. 11-18
発行日: 1988/01/10
公開日: 2010/04/30
ジャーナル フリーThe changes in the crystal structure of powder produced by a rotating friction mill, devised to produce a submicron powder by the mutual friction grinding of two specimens composed of the identical brittle materials, were experimentally studied by electron microscopic observation, selected area electron diffraction and the X-ray diffraction method. The following results were obtained:
(1) From electron microscopic observation and from the electron diffraction patterns, it was known that the powder produced by friction grinding might form a fairly thick amorphous layer, and that the powder produced by agate mortar grinding might cause cleavage fracture.
(2) From the X-ray diffraction patterns of talc, it was found that growth of the lattice strain and the amorphous layer occurred. It is thought that the material of a layer structure, such as talc, first wore away to cause a slip occurring at the weak bond between layers, followed by two-dimensional structure grinding.
(3) From the X-ray diffraction patterns of limestone and marble, it was found that calcium carbonate was transformed from a crystal of calcite to aragonite by friction grinding. This transformation could be explained by considering the force exerted by friction grinding and the process of ship frequently observed in metal crystals.抄録全体を表示PDF形式でダウンロード (3571K) -
小暮 信之, 白波瀬 雅明, 吉山 秀典, 田森 行男1988 年 25 巻 1 号 p. 19-26
発行日: 1988/01/10
公開日: 2010/04/30
ジャーナル フリーFor the purpose of estimating the performance of electrostatic precipitators, a method for measuring the resistivity of stack dust has been investigated using a newly developed automatic measuring system, in which a test cell with parallel plate electrodes is adopted and a moisture monitor using a zirconia sensor is installed. The moisture was generated by the water drop evaporation method.
As measuring conditions, the equilibrium times at which air temperature and moisture content in the constant temperature chamber reach the values set in advance are 20 and 40 minutes, respectively, and a high voltage is impressed on the test cell. Therefore, when increasing the temperature stepwise up to 350°C at a constant moisture the retaining time should be 20 minutes.
The dust resistivity increases as measuring time elapses, depending on the kind of dust samples and the operation conditions, reaching its equilibrium in 60 minutes at the longest. The equilibrium time is 20 minutes when both the loading pressure and the measuring pressure for the dust sample in the test cell are equally set at a constant value of 980Pa.
It was found that an electric field strength of 400kV/m was reasonable for the standard measurement, while the field strength in the conventional electrostatic precipitators is presumed to be in the range of 200-800kV/m抄録全体を表示PDF形式でダウンロード (971K) -
貯槽内の静的粉体応力青木 隆一1988 年 25 巻 1 号 p. 27-33
発行日: 1988/01/10
公開日: 2010/04/30
ジャーナル フリーPDF形式でダウンロード (732K) -
森山 龍一1988 年 25 巻 1 号 p. 50-52
発行日: 1988/01/10
公開日: 2010/04/30
ジャーナル フリーPDF形式でダウンロード (345K)
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