巻号一覧
27 巻, 12 号
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第3報:剃刀の尖端半径の測定について川北 宇夫1958 年 27 巻 12 号 p. 709-713
発行日: 1958/12/10
公開日: 2009/02/09
ジャーナル フリーMeasuring of the top edge radius of blade has hitherto been made by several workers. The method devised by Schmerwitz is most reliable although it is of ruinous nature and gives only the maximum top edge radius. The writer's method, which is optical and not ruinous, gives the mean top edge radius. The experiment shows that, with a few exception, the smaller the top edge radius, the smaller the string cutting value.
The top edge radius of safety razor blades obtainable on the market is found to be about 1μ.
The method is simple yet very effective; it can be used for measuring the radius of curvature at any point on the blade edge surface.抄録全体を表示PDF形式でダウンロード (1149K) -
山中 千代衛, 阪井 英次, 吹田 徳雄1958 年 27 巻 12 号 p. 714-719
発行日: 1958/12/10
公開日: 2009/02/09
ジャーナル フリーOf late, very short pulse signal technique has been well developed and has opened up a wide field in the study of experimental physics. For measuring the electron mobility in alkalihalide single crystals, a set of distributed amplifiers with the total gain of 105 and the band width of 100 MC is devised for the purpose of amplifying short signals of 0.5 mV in amplitude and 10 mps in rise time. The set consists of four groups: pre-amplifier, main amplifier, impedance converter and output amplifier. The total number of tubes used is about 60. Two types of output amplifier are made: one is of conventional push-pull using 16 6CB6 tubes and the other of dynode push-pull using 6 EFP60 tubes. These types of amplifier suffer from thermal noise due to input impedance and shot noise in the first tube limiting the threshold value of the input signal for amplification. The writers' system has a noise input voltage of the order of 50 μV which is considered tolerable for their purpose. Use of these amplifiers enabled the analysis of induced current patterns in specimens bombarded by high energy electrons. The electron mobility in NaCI single crystal was estimated to be about 100 cm2/sec. V at -179◊C.抄録全体を表示PDF形式でダウンロード (1687K) -
第1報:ねじり振動による周波数特性の測定高橋 勇蔵, 田中 広司, 金子 元三, 古市 二郎1958 年 27 巻 12 号 p. 720-725
発行日: 1958/12/10
公開日: 2009/02/20
ジャーナル フリーIn order to ascertain the dynamic viscoelastic behavior of baked coating films during deformation process at a room temperature, the frequency dependence of rigidity modulus G and viscosity η of the films are measured by using a torsional pendulum of improved design consisting of a horizontal steel rod with two equal load disks fixed symmetrically with respect to the rod center at which the lower end of a sample film strip is attached. As the samples, phenol-cresol formaldehyde resin films of thermo-setting type unplasticized and plasticitized with P. V. B. or Epon _??_1009 and Fuji film of thermo-plastic type for the sake of contrast are used. The period of the pendulum is varied within the range of 1.5-17 sec. by shifting the load disks. The frequency dependence of G and η at 20_??_21°C is found as follows:
(1) With all the film examined, G values remain nearly constant but η values change considerably.
(2) η-period relation of Fuji film is of an approximate straight line passing through the origin whereas that of all the other films are of curves of third degree intercepting 7) axis.
(3) η-period relation for all the films is explained satisfactorily by the model of Voigt 4 elements.
(4) The relaxation time τ2=η2/G2 of films plasticized with P. V. B. or Epon _??_1009 is longer than that of unplasticized although η2 and η3 values of the former are smaller than those of the latter.抄録全体を表示PDF形式でダウンロード (438K) -
高林 真1958 年 27 巻 12 号 p. 726-732
発行日: 1958/12/10
公開日: 2009/02/20
ジャーナル フリーReverse characteristics of Ge p-n junctions are studied in detail, and useful and predictable relations obtained. These relations are applicable to actual diodes, alloyed on thin Gewafers.
The two most important findings are:
(1) the design center of the base width should be about 0.55mm for junction diodes alloyed on base materials of _??_sec., _??_, and S_??_200 cm/sec. in the case of P+-N-R structure, and
(2) In the case of n-type Ge wafers of nearly 20Ωcm and 0.5mm thick, it is possible to maintain VB above 500 volts by keeping _??_ sec., and S>500 cm/sec.
The behavior, _??_., is observed for junction diodes made from a small lifetime starting materials of _??_>300μ sec. and nearly 20Ω cm resistivity.抄録全体を表示PDF形式でダウンロード (660K) -
和田 正信, 高橋 正, 福田 正明1958 年 27 巻 12 号 p. 733-737
発行日: 1958/12/10
公開日: 2009/02/09
ジャーナル フリーA new method of measuring photoconductive time constant is described. The basic principle of this method is to match the output waveform of a photoconductive cell with that of a vacuum phototube provided with time constant elements which are adjusted. Detailed explanation is given of the experimental apparatus that has been built to measure the time constant of a Sb2S3 photo-conductive cell used as a target of vidicon. The time constant thus measured is a combination of photoconductive time constant and circuit time constant; the paper deals with how to discriminate the photoconductive time constant and determine it.抄録全体を表示PDF形式でダウンロード (1482K) -
岡山 誠司1958 年 27 巻 12 号 p. 737-744
発行日: 1958/12/10
公開日: 2009/02/20
ジャーナル フリー円筒型黒体炉(その内径を1,長さをlとする)において,その壁面(輻射能はεα)が完全拡散面で,且つ一様な温度を保つときは,底に関する実効輻射能は,次のようにして求めることができる.
4.1 計算式
A.絞り開放
底の実効輻射能をεα+εα'とすれば
εα+εα'=1-(ε1"+ε1''')の関係が成立つ.この右辺をそれぞれ
ε1"=〓(1-εα)·F0(l)
F0(l)=l2+2-〓
および
〓
の式を使つて計算することによりεα+εα'は直ちに求められる.(Fig.3参照)
B.絞りの半径pのばあい底の実効輻射能は
εα+εα'+εα"+εα'''
で表わされる.つまり開放での実効輻射能εα+εα'にεα"+εα'''をつけ加えるだけでよい.これらの値は,それそれ
〓ここにk=1-p2,〓および〓で与えられる.(Fig.4 参照)
4.2 数値例
l=1, 2, ••••, 10まで,
εα=0.25, 0.5, 0.75の各種のばあいについて,それぞれ絞り開放(p=1)およびp=0.5に絞つたときの,底の黒さを,完全黒体からはずれる程度をあらわすδ0, δpを使つて求めておいた.その結果をTable 1に示す.
同表には,このほかF0(l),Q0(l), Fp(l)の計算結果も並記してある.なお, Q0(l)はl=10までを10等分し,その間では直線,つまり勾配は一定であるとみなして求めたものである.
またTable 2には,これまで既に発表された実効輻射能を求める計算式を使つて求めたδ0, δpを参考までに記載してある.
以上の値をまとめて,グラフ上にプロットするとFig. 5～10がえられる.
以上の考察および計算から結論できることは,εαが小さければ,精密解でえられる黒さには達しないが,実際使用される黒体炉の材料では,充分εαが大きいものを撰ぶので,このときには安心してこの近似計算法によつて黒さを調べてよいということである.抄録全体を表示PDF形式でダウンロード (503K) -
1958 年 27 巻 12 号 p. 744
発行日: 1958年
公開日: 2009/02/09
ジャーナル フリーPDF形式でダウンロード (63K) -
石井 勇五郎, 山口 弘之1958 年 27 巻 12 号 p. 745-751
発行日: 1958/12/10
公開日: 2009/02/09
ジャーナル フリーIn brazed boundary, the movement of atoms of metal are studied by using isotopes as tracer. The behaviour of the isotope used in a filler metal at the boundary is observed by autoradiographic method. As the first step, solid solutions, eutectics and peritectics, which are supposed to be formed when the metals are brazed, are studied. Zn 65 was sandwiched between two crystals of a brass of 30% and 15% in content. The diffusion was faster in the former than in the latter. This phenomenon is explainable by the theory of Johnson and Wagner. When copper is brazed with Ag 110, it is found that the atoms of the filler metal move more readily along a special direction in a crystallographic plane of foreign metal. For example, it is always faster in [110] direction than in any of other directions.
Behaviours of Zn 65 in silver and tin are observed by “specific contact autoradiography” with a considerable resolving power. The results by autoradiography are in fair agreement with microphotographic structures.抄録全体を表示PDF形式でダウンロード (3948K) -
小野田 博, 河田 幸三1958 年 27 巻 12 号 p. 751-758
発行日: 1958/12/10
公開日: 2009/02/09
ジャーナル フリーResidual strain in injection molded specimens of linear polymer (polystyrene) is photoelastically analyzed.
In the samples, isochromatic patterns of high orders are observed. The retardation observed seems to be based upon two types of residual strains: (1) frozen molecular orientation caused by the flow of molten linear polymer in molding process, and (2) that by thermal stress as the result of quenching in dies. This is ascertained by the fact that isochromatic patterns are scarecely changed when sliced at an ordinary temperature, and that a remarkable decreasing of isochromatic fringe order occurs accompanying shrinkage and deformation of the samples when annealed at temperatures higher than the secondary transition point.
Principal stress trajectories derived from isoclinic patterns seem to coincide with thedirection of flow in molten linear polymer. Therefore, photoelastic analysis may also be applied to study the state of flow of molten polymer in molding process.
A few results on the relations between the maximum isochromatic fringe orders in molded specimens and molding conditions were obtained.抄録全体を表示PDF形式でダウンロード (2336K) -
田中 俊一1958 年 27 巻 12 号 p. 758-762
発行日: 1958/12/10
公開日: 2009/02/09
ジャーナル フリーUsing the apparatus and methods previously reported by the author1), 2), reflection characteristics of several kinds of ground glass, prepared by rubbing with alundum of 100 to 300 mesh, are measured. The results obtained are as follows:
1. The distribution of the relative area of mirror facets having various inclination to the mean surface resembles normal distribution, but the kurtosis index is somewhat larger.
2. When the incidence or reflecting angle is larger than 50°, the maskings of mirror facets occur and the coarser the roughness of the surface, the larger the magnitude of the maskings.
3. If the distribution of mirror facets is represented by the normal distribution function having the standard deviation of about 18° and the masking of them by the exponential function, the reflection characteristics of ground glass can be approximately explained by the combination of these two functions.抄録全体を表示PDF形式でダウンロード (358K) -
宮田 尚一, 柳川 三郎, 野間 正喜, 早水 良定1958 年 27 巻 12 号 p. 762-766
発行日: 1958/12/10
公開日: 2009/02/09
ジャーナル フリーThe authors presented previously a graph showing the mutual relation between aberrations and central obstruction of reflecting microscope objectives.
Results of further scrutiny of this graph are described. Best solutions for aspherical objectives lie on a straight line. These solutions have a small central obstruction (0.3>R>0.2) and no comatic aberration but a large negative spherical aberration. Plane parallel glass plates have a large positive spherical aberration and cancel this negative aberration. The residual aberrations are eliminated by aspherising a concave mirror. As a practical example, an objective of NA=0.65, R=0.26 for visible light is illustrated.抄録全体を表示PDF形式でダウンロード (387K) -
Yoshio SUGE, Masaharu AOKI1958 年 27 巻 12 号 p. 767
発行日: 1958/12/10
公開日: 2009/02/09
ジャーナル フリーPDF形式でダウンロード (66K) -
Atusige YANO1958 年 27 巻 12 号 p. 768-769
発行日: 1958/12/10
公開日: 2009/02/09
ジャーナル フリーPDF形式でダウンロード (176K)
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