result 9157 件
| JaLCDOI | 10.18926/15818 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_20_2_21.pdf |
| Author | Yamada, Masuo| Ohta, Mutsuo| Sakakibara, Akira| |
| Abstract | A series of small-angle X-ray scattering photographs with monochromated and point focussed copper Ka(1) radiation was taken of a single crystal of an Al-4mass % Cu alloy at the as-quenched state from 823K and at successive stages of ageing at 313K. The crystal was so oriented that the incident direction of the radiation was along [001] axis, and was cooled with liquid nitrogen during the exposure. The pattern of the as-quenched state was homogeneous, but each of the patterns of the aged states consisted of streaks along [100] and [010] directions and a quasi-ring around the trace of the incident beam on the film (even at the shortest ageing time. l6sec). The most intense regions were found in [100], [010] , [100] and [010] directions on the ring. With the progress of the ageing the streaks and the ring became more intense and narrower. The results can be interpreted from points of view of the formation of the GP zones parallel to {100} planes ab initio, the effect of the inter-particle interference on scattering of X-rays, and the growth of the GP zones with the ageing. Guinier radius of the GP zones at each stage can be obtained from intensity change along [110], and the values are reasonably consistent with those obtained from the cross section of the streak. The presence of multi-layer zones, besides the one-layer ones, is suggested from the humps found on several intensity curves along [100] at later stages. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1986-02-28 |
| Volume | volume20 |
| Issue | issue2 |
| Start Page | 21 |
| End Page | 33 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307538 |
| JaLCDOI | 10.18926/15817 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_17_1_41.pdf |
| Author | Mori Chuji| Hattori Susumu| Hamate Shinya| |
| Abstract | The algorithm of automatic stereo plotting by iterative image correlation from aerial photographs and the corresponding empirical tests are described. The algorithm is oriented to off-line process, using a image scanner and a general purpose computer, and consists of 3 hierarchical correlation steps, based on one-dimensional matching using usual correlation maximum. For the correlation calculation, the FFT is effectively used. Though some defects exist in the algorithm at present, close contour plotting to middle scale maps is available except in hilly regions, in which marked features in ground covers do not exist. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1983-02-25 |
| Volume | volume17 |
| Issue | issue1 |
| Start Page | 41 |
| End Page | 60 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307285 |
| JaLCDOI | 10.18926/15811 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_20_1_45.pdf |
| Author | Korenaga Takashi| Moriwake Tosio| Takahashi Teruo| |
| Abstract | A simple system was developed for the fully automatic and continuous measurement of chemical oxygen demand (COD) in wastewater samples based on colorimetry of dichromate. A sample and a solution of sulfuric acid (1+1) containing 2mM potassium dichromate are continuously pumped with a double-reciprocating micro-pump at each flow rate of 0.3 ml/min. The wastewater sample is filtered at first with a 100-mesh stainless filter and then mixed with the dichromate solution in the mixing joint. The mixture is introduced into a reaction coil made of poly(tetrafluoroethylene) tubing (1 mm i.d., 3 mm o.d., and 20 m length), being placed in an oil bath (120℃). After reaction, the mixture passes into a quartz tubular flow-through cell (10 mm path length, 18 μl volume) in a spectrophotometer, and the absorbance is measured at 445 nm. The COD value of the sample is automatically estimated from the amount of decreased absorbance. The system was successfully applied to COD measurement of some waters, and to continuous monitoring of COD in wastewater of university laboratories. The system was also evaluated by comparing with the flow injection analyzer system previously developed by the authors. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1985-11-08 |
| Volume | volume20 |
| Issue | issue1 |
| Start Page | 45 |
| End Page | 52 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307695 |
| JaLCDOI | 10.18926/15799 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_16_1_105.pdf |
| Author | Myojin Sho| Asai Kazuhiko| |
| Abstract | A welfare economic approach is tried to an optimal decision of toll rate and expansion of urban expressway network in an equilibrium of toll revenues and cost of service supplied. The model, originated with Yamada, is such that the decision comes into optimality when the maximum consumers' surplus is reached in the equilibrium condition. The paper is concerned with some general aspects of the optimal solution and reexamination of the solution obtained in the past when used a specific demand curve. General aspects obtained are as follows; The extremum condition to consumers' surplus is equivalent to that to diverted traffic (the realized number of expressway users) only when demand curve has such a property that the marginal consumers' surplus to network expansion vanishes. In case that the marginal consumers' surplus does not vanish, the extrema of consumers' surplus is found in the regions of negative marginal diverted traffic if demand curve yields positive marginal surplus, and in the regions of the positive if it gives negative marginal surplus. The contact points of demand and average cost curves give extrema of neither consumers' surplus nor diverted traffic. An implicative finding, made out by Yamada by using a specific demand curve, that optimal network expansion is reached when the marginal service cost to expansion averaged to the marginal diverted traffic to expansion is equal to the value of time saved by using expressway just by mean trip length holds good at the points of the maximum diverted traffic, but not at the contacts of demand and average cost curves. In case of the demand curve, the condition for an equilibrium of revenues and cost to come into existence is that the minimum of the ratio of service cost averaged to the whole population of expressway users to the value of time mentioned above is less than or equal to e(-1). |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1982-03-01 |
| Volume | volume16 |
| Issue | issue1 |
| Start Page | 105 |
| End Page | 123 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307932 |
| JaLCDOI | 10.18926/15776 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_15_2_79.pdf |
| Author | Koga, Ryuji| Nagase, Satoru| Kosaka, Megumi| Sano, Hiroya| |
| Abstract | A method to monitor atmospheric gas concentration employing a tunable diode laser is proposed. An apparatus was built and experiments were made. The tunable diode laser employed was of'PbSnTe with its wavenumber about 1200 cm(-1) at a temperature of 77 K. Methane concentration in laboratory atmosphere was measured on the experiments. The inquired gas-density is obtained by a hardwired microcomputer incorporating the measured absorption spectrum over a prescribed range instead of an absorption at a single wavenumber. By this, drift type noises are suppressed. After an analysis based on experimental data, an attainable sensitivity for methane was found to be 1 ppb.m. This value may increase if an etalon fringe interference exists. The natural concentration, about 1 ppm, of atmospheric methane was actually measured with a short optical path of only one meter. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1981-03-30 |
| Volume | volume15 |
| Issue | issue2 |
| Start Page | 79 |
| End Page | 92 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307246 |
| JaLCDOI | 10.18926/15770 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_15_2_29.pdf |
| Author | Ohta, Mutsuo| Kanadani, Teruto| Sakakibara, Akira| Yamada, Masuo| |
| Abstract | Measurements of electrical resistivity and intensity of small-angle X-ray scattering and transmission electron microscopy were made on Al-Zn alloys of several compositions. G.P. zones are formed by the nucleation-and-growth mechanism above the spinodal temperature. The nucleus has a critical size for growth. This size becomes larger when aged at higher temperatures. The sizes of the G.P. zones formed by this mechanism distribute broadly, but those formed by the spinodal decomposition do closely. The spinodal temperatures estimated for Al-10.0, 12.5, 15.0, and 20.0wt % Zn alloys are ~95, ~110, ~130, and ~180℃, respectively. The critical temperatures below which G.P. zones are observed in these alloys are ~115, ~135, ~160, and ~210℃, respectively. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1981-03-30 |
| Volume | volume15 |
| Issue | issue2 |
| Start Page | 29 |
| End Page | 53 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307895 |
| JaLCDOI | 10.18926/15769 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_15_2_21.pdf |
| Author | Akagi Fumio| Osaki Hirokazu| Kikuchi Susumu| |
| Abstract | An assembly line with no paralleling of work elements and work stations is called a serial line. The cycle time of the serial line must be at least equal to the maximum work element time. To lower the cycle time beyond the limit and increase the production rate, one may permit the paralleling of work elements or work stations. So in this paper we propose the parallel assignment method for achieving a higher production rate. In this method, work elements are assigned to work stations under the multiple upper time limits which are the products of the various numbers of workers and the limiting cycle time. Further we develop the computer program of the proposed method and provide an illustrative problem and computational results. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1981-03-30 |
| Volume | volume15 |
| Issue | issue2 |
| Start Page | 21 |
| End Page | 28 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307495 |
| JaLCDOI | 10.18926/15765 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_15_1_111.pdf |
| Author | Korenaga Takashi| Ikatsu Hisayoshi| Moriwake Tosio| Takahashi Teruo| |
| Abstract | On the flow injection analysis (FIA) of chemical oxygen demand (COD), silver salt was added as an oxidation catalyst for COD substances and a masking agent for halide to improve operating conditions of the FIA apparatus. Both of a proper concentration of potassium permanganate solution and 6.0 % sulfuric acid solution containing 0.1 % silver nitrate are individually pumped up with respective flow rates of 0.51 ml min(-l) and merged into a carrier stream. A 20 μ1 of sample solution is injected into the flow of sulfuric acid solution at just before the merging place. The sample mixed with the carrier solutions in a reaction manifol(polytetrafluoroethylene tubing: 0.5 mm i.d. x 30 m), is passed through a thermostated bath at 100 °c and led to a flow cell for the absorbance measurements at 525 nm. The absorbances are continuously recorded with time. The peaks in the recordings showed good reproducibility and the calibration obtained at a linear concentration range of 0 - 170 mg 1(-1) COD with glucose as standard. The detection limit and precision confirmed with this method were 5 mg 1(-1) and 0.8 %, respectively. Chloride ion up to 200 mg 1(-1) did not interfere without elimination of a silver chloride precipitate. By the present FIA method, several industrial waste water samples were analyzed at a sampling rate of about 40 samples per hour, and their apparent COD values were compared with those found by the manual JIS method. Both of the methods gave the similar results within an error range from -35 to +5 %. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1980-11-29 |
| Volume | volume15 |
| Issue | issue1 |
| Start Page | 111 |
| End Page | 121 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307490 |
| JaLCDOI | 10.18926/15764 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_18_1_33.pdf |
| Author | Osaki Hirokazu| Miyake Hirofumi| Kikuchi Susumu| Ogata Masana| |
| Abstract | In this paper, we mentioned the apparatus developed to measure CFFs at the various point of the retina. Eleven CFFs measured at the central retina of both eyes (used usually} simultaneously, at the central retina of each eye separately, and at four points of the peripheral retina of each eye were analyzed together and referred to as the multi-point critical flicker fusion frequency (MCFF) . MCFF can be used to estimate the level of cortex activity, since the temporal and nasal parts of each eye are connected to different visual cortexes through the optic nerve. As the apparatus used to measure the MCFF was controlled by a micro-computer, the order of measurements and the calculation were done automatically. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1984-03-30 |
| Volume | volume18 |
| Issue | issue1 |
| Start Page | 33 |
| End Page | 42 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307595 |
| JaLCDOI | 10.18926/15763 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_15_1_101.pdf |
| Author | Taniguchi Takeo| Numata Katsu| |
| Abstract | In this paper the fill-in minimization problem which arises at the application of the sparse matrix method for a large sparse set of linear equations is discussed from the graph-theoretic viewpoint and also through the numerical experiments. Therefore, this investigation consists of two parts, and in the former part the author shows, at first, that the elimination process of a sparse matrix is equivalently replaced to the vertex eliminations for a graph obtained from the matrix, and by use of some concepts in the theory of graph he proves that the vertex elimination process for the minimum fill-in is equivalent to the vertex eliminations for vertices in each subgraph which is obtained by the appropriate dissection of whole graph, and that there are only two types of vertex eliminations through the process. This results in the proposal of a new model of the vertex elimination process. The latter part of this investigation is used for the verification of the results from the theoretic investigation. Through the numerical experiments he concludes that the new model of the vertex elimination process is valid, at least, for a graph like a regular finite element mesh. Furthermore, he shows that this model coincides with Nested Dissection Method which can give the minimum value of fill-in, at present. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1980-11-29 |
| Volume | volume15 |
| Issue | issue1 |
| Start Page | 101 |
| End Page | 110 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307966 |
| JaLCDOI | 10.18926/15762 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_18_1_1.pdf |
| Author | Nakata Takayoshi| Takahashi Norio| |
| Abstract | The quantitative analysis of localized flux distributions in transformer cores has become easy through the progress of numerical field calculations. In this paper, the effects of core constructions, joint configurations, magnetizing characteristics of materials on the flux distributions are examined using newly developed techniques such as a gap element, an approximate method for solving three-dimensional magnetic fields, the time periodicity finite element method, an efficient technique for treating hysteresis characteristics and so on. A method for the optimum design of transformer cores is also discussed. Main results obtained can be summarized as follows: (a) The building factor of the core made of higely-oriented silicon steel is larger than that of the conventional core. (b) The iron losses at joints are much affected by overlap lengths, number of laminations per stagger layer and a small irregularity of the arrangement of sheets. (c) It is clarified that examinations of the optimum construction of core and the most desirable magnetic characteristics of core material are possible using the finite element method. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1984-03-30 |
| Volume | volume18 |
| Issue | issue1 |
| Start Page | 1 |
| End Page | 31 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307976 |
| JaLCDOI | 10.18926/15756 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_15_1_47.pdf |
| Author | Koga, Ryuji| Nagase, Satoru| Kosaka, Megumi| Sano, Hiroya| |
| Abstract | Basic prohlems are discussed about a local, realtime and very sensitive air-pollution monitoring using a laser diode. The method employs the second derivative spectrometry replacing the incoherent light source and mechanical choppers in a traditional method with the laser diode and a newly developed electronic system. Etalon fringes at this system becomes the dominant noise source and its statistic and dynamical features are to be understood. Numerical examination was done for the optimal width of optical frequency modulation. A very fast measurement of weak absorption spectra became possible by the development of lock-in-amplifiers with finite integration time instead of a low-pass filter. Spectra of methane in 7.6 μm region and a time-dependent spectrum of the etaIon fringe are shown. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1980-11-29 |
| Volume | volume15 |
| Issue | issue1 |
| Start Page | 47 |
| End Page | 60 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307627 |
| JaLCDOI | 10.18926/15754 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_15_1_29.pdf |
| Author | Okamoto Takuji| |
| Abstract | In this paper, a hardware design of digital systems with remote-diagnostic capability is presented. We consider a method for testing a system T(l) on a module basis with a remotely installed systems T(2). In the testing mode, we set up a system (T(l)-m,m') such that a module m of T(l) is replaced by an adapter A(1) connected to other adapter A(2) through a telephone line and the corresponding module m' of T(2) is connected to A(2). If the system (T(l)-m,m') can simulate T(1) in the absence of any faluts, then it can test m' under a self test program. The main subject of this paper is to study the conditions of the system to be testable in the above sense. At first, the remote diagnostic network based on the system in this paper, restrictions to the system configuration required to perform such a diagnosis and the operation of the diagnostic system are described. The second, the module structure to make above simulation possible is considered, representing the system configuration graphically. Finally, an example of the adapter is shown and the time consumed to diagnose is discussed. One of our results is that a sufficiently large class of synchronous digital systems with few minor conventions is testable. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1980-11-29 |
| Volume | volume15 |
| Issue | issue1 |
| Start Page | 29 |
| End Page | 45 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307349 |
| JaLCDOI | 10.18926/15752 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_14_2_119.pdf |
| Author | Korenaga Takashi| Ikatsu Hisayoshi| Moriwake Toshio| Takahashi Teruo| |
| Abstract | A new method based on the principle of flow injection analysis is presented for the semiautomated determination of chemical oxygen demand (COD) in environmental water samples. The method is rapid and continuous, and suitable for the monitoring of COD in wastewaters. The apparatus used was simply constructed by parts commercially available for high performance liquid chromatography. Teflon tubing heated with a boiling water was used as a reactor and simultaneously used for mixing coils and transmission lines. The operating conditions were examined to apply the determination of COD in wastewaters by using glucose as a standard COD substance. The procedures recommended are as follows: Both 4.9x10(-4) M potassium permanganate and 6.7 % sulfuric acid solutions are individually pumped, 20 μl of a sample solution is injected into the flow of the sulfuric acid solution, and then mixed with a mixing joint. The mixed solution is transported to a flow cell situated in a spectrophotometer fixed at a wavelength of 525 nm, and decrements of absorbance are recorded. The peaks were reproducibly obtained at a concentration range of 10 - 200 mg-COD 1(-1). Chloride up to 1000 mg 1(-1) was not interfered at all. Various wastewater samples were analyzed by the proposed method at a sampling rate of 30 samples per hour, and the apparent COD values obtained were compared with the manual COD ones obtained by JIS method. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1980-03-01 |
| Volume | volume14 |
| Issue | issue2 |
| Start Page | 119 |
| End Page | 129 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307775 |
| JaLCDOI | 10.18926/15749 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_14_2_73.pdf |
| Author | Kono Iichiro| Nishigaki Makoto| |
| Abstract | This paper deals with the experimental study of hydraulic properties of unsaturated soil. In treating unsaturated zone, a great deal more data are required than are required for the saturated zone, but these properties of soils must be known to apply the finite element approach to actual groundwater flow problems. The purposes of this paper are to propose a rational basis of getting experimental relationships between prossure head() and hydraulic conductivity(K) and between pressure head() and volumetric moisture content(θ) with "the instantaneous profile method" in a laboratory. An apparatus was constructed and test procedures were developed to measure pressure head and volumetric moisture content by using pressure transducers and low-energy gamma ray attenuation. The technique of a low-energy gamma radiation apparatus does provide a means for accurate measurement of water content without disturbing the system into which water is moving. Furthermore rapid measurement of water content becomes possible at any position in a soil so that water content changes with time may easily be followed. The tensiometer~transducer system provides a most valuable means of measuring pressure head with rapid response and with provision of a complete record of the pressure head changes with time. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1980-03-01 |
| Volume | volume14 |
| Issue | issue2 |
| Start Page | 73 |
| End Page | 110 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307379 |
| JaLCDOI | 10.18926/15746 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_14_1_127.pdf |
| Author | Nago Hiroshi| Furukawa Syuzo| |
| Abstract | In this paper the discharge coefficient of a sluice gate placed at the sudden expansion of an open channel is investigated theoretically and experimentally. Lateral and vertical expansions are treated in the study. The coefficients obtained for channels with sudden expansion are compared with those for the straight channel. For free efflux, experimental results show that the coeffcients for expanded channels are always larger than those for a straiaht one,and that the coefficient for a channel to be fully expanded to both lateral and vertical directions takes about 1.2 times larger value than that for a straight one. For submerged efflux, the coefficient is obtained theoretically by using the efflux model shown in this study. The theoretical results explain the experimental ones fairly well. The coefficient for lateral expansion is always smaller than that for a straight channel. The minimum downstream water depth required to submerged efflux for the expanded channels becomes smaller than that for a straight channel. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1979-12-01 |
| Volume | volume14 |
| Issue | issue1 |
| Start Page | 127 |
| End Page | 138 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307258 |
| JaLCDOI | 10.18926/15742 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_14_1_61.pdf |
| Author | Kono Iichiro| Nishigaki Makoto| |
| Abstract | The purposes of this paper are primarily to research on behavior of groundwater flow in saturated and unsaturated zone and to develop the most effective methods for solving groundwater flow problems related to civil engineering practice. The mathematical model provides a finite element solution to two- or threedimensional problems involving transient flow in the saturated and unsaturated domains of nonhomogeneous, anisotropic porous media. Before progressing into the various levels of applications the input data and boundary conditions are discussed and evaluated. To demonstrate the flexibility of the finite element approach and its capability in treating complex situations which are often encountered in the field, the groundwater flow through sand bank at flood water levels and the flow through aquifer due to an excavation were analyzed. As the results there were good qualitative agreements between the numerical results and the informations received. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1979-12-01 |
| Volume | volume14 |
| Issue | issue1 |
| Start Page | 61 |
| End Page | 94 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307580 |
| JaLCDOI | 10.18926/15736 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_14_1_15.pdf |
| Author | Ishihara Yoshiyuki| Takahashi Norio| |
| Abstract | Characteristics of iron losses in silicon steel due to inclined rotating fluxes and distorted ones are described. Iron losses due to rotating fluxes have been measured at various conditions for grain-oriented and non-oriented silicon steels by using an improved thermistor-bridge method. Loss measurements indicate that the iron loss due to the inclined rotating flux is greater than that due to the non-inclined one. However, the iron loss due to the distorted rotating flux is not always greater than that due to the non-distorted one. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1979-12-01 |
| Volume | volume14 |
| Issue | issue1 |
| Start Page | 15 |
| End Page | 28 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307734 |
| JaLCDOI | 10.18926/15735 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_14_1_9.pdf |
| Author | Fujiwara Yasuo| Monobe Kazuo| |
| Abstract | In the course of the study of polymer crystallization at high pressure, oriented crystallization of extended chain crystals of polyethylene were examined. Molten polyethylene were extruded into a die at a few hundred atm, and follwed by crystallization by high pressure application above 3000 atm. Resulting sample shows chain orientation to extruded direction. Thick lamella nearly a few thousand angstrom, which are typical feature of high pressure crystallization, were observed to be stacked parallel each other. In spite of favorable condition for crystals to grow to chain direction, remarkable growth to normal direction to them were also observed. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1979-12-01 |
| Volume | volume14 |
| Issue | issue1 |
| Start Page | 9 |
| End Page | 14 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307317 |
| JaLCDOI | 10.18926/15733 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_12_129.pdf |
| Author | Myojin Syo| Tatsuta Akira| Taka Yasuhisa| Asai Kazuhiko| |
| Abstract | A statistical analysis is applied to find what states of "block" are dangerous from view point of traffic accident. Here, the block is defined to be an area surrounded by some major streets and is feeded by a minor street network. The accidents under study are those which occur in the whole minor street network. They are grouped into three kinds; pedestrian, vehicle and the gross accidents. And each is classified to three types according to the place where the accident occurs. At the beginning 22 variables are assumed to state a certain relationship of some states of the block with the occurrences of accidents and 12 variables are found significant finally through factor analysis. Further examination has reached several key variables that migth have something significant to cause traffic accidents in the block. The key ones are the number of lanes of street and the number of legs of intersection, especially nearly 2 lanes street and 3-leg intersection, respectively. The case study was carried out on 26 blocks sampled from Osaka City. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1978-02-25 |
| Volume | volume12 |
| Start Page | 129 |
| End Page | 139 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307311 |
