Showing papers by "National Tsing Hua University published in 1978"
TL;DR: In this paper, the authors derived approximate expressions for the general-relativistic metric and the general relativistic equations of motion of freely falling particles in such a laboratory.
Abstract: Most experimental laboratories accelerate and rotate relative to inertial frames. This paper derives approximate expressions for the general-relativistic metric and the general-relativistic equations of motion of freely falling particles in such a laboratory. The metric is derived accurate to second order in distance from the origin of coordinates; the equations of motion are derived accurate to first order. The equations of motion contain inertial, Coriolis, and centripetal pseudoforces, electric, magnetic, and magnetic-magnetic type forces due to Riemann curvature (inhomogeneous gravity), "gravitational red-shift" corrections to these forces, and velocity-induced special-relativistic corrections.
156 citations
TL;DR: A theoretical description of the inelastic interactions of electrons with solid polystyrene is presented in this article, where the response of the valence electrons to energy and momentum transfers is determined by a model insulator theory; carbon K-shell ionization cross sections are derived from atomic, generalized oscillator strengths.
Abstract: A theoretical description of the inelastic interactions of electrons with solid polystyrene is presented. The response of the valence electrons to energy and momentum transfers is determined by a model insulator theory; carbon K-shell ionization cross sections are derived from atomic, generalized oscillator strengths. Contributions to the inverse mean free path and stopping power due to these two excitation processes are derived and tabulated for incident electrons with energies from 10 eV to 10 keV. Electron ranges in the continuous-slowing-down approximation are calculated and tabulated for electrons with energies from 15 eV to 10 keV.
77 citations
TL;DR: In this paper, the minimum end time problem for batchwise radical chain polymerization was studied for the optimal and best isothermal process for the "optimal" process and "best" process, respectively.
72 citations
TL;DR: Shift Walsh matrix as mentioned in this paper is a shift Walsh matrix that is formed from the m \times m Walsh matrix by shifting the columns of the Walsh matrix to the right, dropping the last k(m \geq k > O) columns and assigning first k columns of new matrix as zero elements.
Abstract: Shift Walsh matrix is first introduced. The m \times m shift Walsh matrix is formed from the m \times m Walsh matrix by shifting the columns of the Walsh matrix to the right, dropping the last k(m \geq k > O) columns and assigning first k columns of the new matrix as zero elements. Delay Walsh functions can be expanded in terms of Walsh functions using shift Walsh matrix. Therefore, linear delay-differential equations can he analyzed by Walsh series approximation. The method is most useful for time-varying systems.
71 citations
52 citations
01 Dec 1978
TL;DR: In this article, the properties of single-phase CuInS2 films were characterized by Raman scattering and back scattering was used for the film analysis, and as-deposited films were p-type with resistivities in the range of 10-1 to 101 03A9-cm.
Abstract: 2014 Novel methods for the material synthesis, crystal growth and film preparation of CuInS2 were developed, some of their properties were characterized. CuInS2 single crystals were grown by iodine vapour transport. The habit-planes were determined to be (112) and (110). The lattice parameters were determined to be a = 5.517 Å, c = 11.122 Å (tetragonal). The as-grown crystals were n-type with resistivities in the order of 106 03A9-cm. Eight lattice vibration modes were characterized by Raman Scattering. Single phase CuInS2 thin films were prepaed by RF sputtering The as-deposited films were p-type with resistivities in the range of 10-1 to 101 03A9-cm. Back scattering was used for the film analysis. The feasibility of using flash evaporation to deposit single phase CuInS2 films has also been studied.
34 citations
TL;DR: An efficient computer-aided root-locus method is described based on the concept of continuation methods in which the solution of a parameterized family of algebraic problems is converted into a differential equation.
Abstract: An efficient computer-aided root-locus method is described The approach is based on the concept of continuation methods in which the solution of a parameterized family of algebraic problems is converted into the solution of a differential equation. The root-locus plot is obtained in a systematic manner by numerical integration. Singularities are analyzed and classified according to the properties of higher order derivatives. Depending on their classification, singular points on the root loci are taken care of accordingly.
34 citations
TL;DR: In this article, the authors extended the theory of a thermal compressor (ejector) to refrigeration applications in mobile use and showed that the engine waste heat for a 2000 c.c. automobile could produce 2.34 tons cooling effect while the power consumption was just 0.06 HP.
29 citations
TL;DR: In this paper, the modified Wiehe-Bagley expressions for G E, H E and V E of alcohol-inert solvent solutions are applied to alcolhol-active solvent solutions.
28 citations
TL;DR: In this article, the characteristics of an ultrarelativistic charged particle in a general, large-scale, electromagnetic field, taking into consideration the effects of strong radiative damping, were studied.
Abstract: This paper studies the characteristics of an ultrarelativistic charged particle in a general, large-scale, electromagnetic field, taking into consideration the effects of strong radiative damping. Formal solutions of the Lorentz-Dirac equation in an arbitrary external field are given. They are applied to cases of astrophysical interest. The final energy of the particle and the rate and characteristic frequency of the radiation are derived.
26 citations
TL;DR: In this paper, the surface-state energy band structures of the MgO (100) and Tamn (110) surfaces have been investigated using both the Green's function formalism and LCAO method.
Abstract: The surface-state energy band structures of the MgO (100) and (110) surfaces have been investigated using both the Green's function formalism and LCAO method. We have studied the band structures of both Shockley and Tamn surface states in some detail. Numerical identity of energies for surface states, one from a semi-infinite system and the other from a thin film, is established.
TL;DR: Aus den oberirdischen Teilen von Pteris vittata L. wurden zwei neue Lignanglykoside isoliert und identifiziert.
Abstract: Aus den oberirdischen Teilen von Pteris vittata L. wurden zwei neue Lignanglykoside, d. h., cis-Dihydro-dehydro-diconiferylalkohol-9-O-β-D-Glukosid (I) und Lariciresinol-9-O-β-D-Glukosid (III) isoliert und identifiziert.
TL;DR: In this paper, lead diethyldithiocarbamate is used as an effective reagent for preconcentration of mercury in urine for neutron activation analysis, as lead is insensitive to neutron activation, radiochemical separation is not needed after neutron irradiation.
TL;DR: Aus den oberirdischen Teilen von Pteris grandifolia L. wurden neben Quercitrin (3, 5, 7, 3', 4'-Pentahydroxy-flavon-3-mono-α-L-rhamnopyranosid) zwei neue Flavonol-acetyl-glykoside, d.h., 3"-O-Acetyl-quercITrin and 4"-O -Acetic Quercite as discussed by the authors isoliert und identifizi
Abstract: Aus den oberirdischen Teilen von Pteris grandifolia L. wurden neben Quercitrin (3, 5, 7, 3', 4'-Pentahydroxy-flavon-3-mono-α-L-rhamnopyranosid) zwei neue Flavonol-acetyl-glykoside, d.h., 3"-O-Acetyl-quercitrin und 4"-O-Acetyl-quercitrin isoliert und identifiziert.
TL;DR: In this article, normal and resonance Raman effects in gaseous chlorine were carefully studied with a powerful argon ion laser and the fine structures of the normal Raman spectra were examined.
Abstract: Normal and resonance Raman effects in gaseous chlorine were carefully studied with a powerful argon ion laser. No resonance Raman behaviour could be detected in the spectra excited by visible laser lines with wavelengths down to 4545A. The fine structures of the normal Raman spectra were examined. Resonance Raman spectra were obtained with the 3638 and 3511 A UV line excitation. Progressions with seven overtones were recorded. The fine structures in each overtone region were analysed and assigned as the Q and S band heads of various isotopic molecules. The Raman cross-section was enhanced only by a factor of 1.3 in the resonance case and the integrated intensity of each overtone was about one-third of that of the fundamental. Those two characteristics indicate that the resonance Raman term in gaseous chlorine is small in comparison with the normal Raman term even when the energy of the excitation laser line is 7593 cm−1 above the dissociation limit.
TL;DR: The authors computer scientists face at least two problems in promoting the use of computerized data-base systems: some important data might be missing; there might be errors in the data.
Abstract: We computer scientists face at least two problems in promoting the use of computerized data-base systems: 1) some important data might be missing; 2) there might be errors in the data. Both of these problems can be quite serious. If they cannot be solved, it will be quite hard to convince potential users that computerized information systems are useful.
TL;DR: In this article, the effects of solute content, temperature, and irradiation dose on the void swelling characteristics of pure nickel and several nickel base solid solutions (Ni-Al and Ni-Ti containing up to 8 at. pct solute and up to 16 pct Cr) have been evaluated using transmission electron microscopy.
Abstract: The effects of solute content, temperature, and irradiation dose on the void swelling characteristics of pure nickel and several nickel base solid solutions (Ni-Al and Ni-Ti containing up to 8 at. pct solute and Ni-Cr containing up to 16 pct Cr) have been iNvesti-gated. Samples were irradiated in the temperature range 400 to 650°C to a maximum dose of 70 dpa using 3.5 MeV58Ni+, 400 keV14N+ and 400 keV14N+
2 ions. The irradiation in-duced microstructures were studied using transmission electron microscopy. In general, the addition of Al, Cr or Ti to Ni is found to decrease the void swelling and mean void diameter and to increase the dislocation density. The behavior of the void number den-sity, Nv, as a function of solute content is found to be dependent upon the irradiation con-ditions as well as the particular solute addition. Nv passes through a maximum at approxi-mately 2 pct solute content for Ni-AI and Ni-Cr alloys irradiated at 550°C, but through a minimum at 4 pct for Ni-Ti alloys irradiated at 550 and 600°C. Nv decreases monotoni-cally as a function of Al content at 600 and 650°C. The results are discussed in terms of recent theories of void swelling suppression due to impurity or solute additions and in light of several correlations between void swelling and material parameters. The be-havior of Nv is found to be best described by the actions of two compcting processes. The first enhances void nucleation, is not strongly temperature dependent and is dominant at low solute contents. The second suppresses void swelling, is probably diffusion con-trolled and dominates in the more concentrated alloys.
01 Jan 1978
TL;DR: Both postsynaptic and presynaptic neurotoxins interfere with the release of acetylcholine from the motor nerve terminals and are valuable tools for the investigation of the mechanism of transmitter release.
Abstract: Neurotoxins isolated from spiders, scorpions, snakes, fishes and microorganisms, etc., have been extensively investigated. Two pharmacologically distinct types of neurotoxic proteins which block transmission across the cholinergic neuromuscular junction have been isolated from snake vemon. Postsynaptic neurotoxins block the nicotinic acetylcholine receptor at the motor end plate and produce a nondepolarizing block of neuromuscular transmission, just like d-tubocurarine. Due to their strict specificity, the curarimimetic neurotoxins have proven important tools for the isolation and investigation of the cholinergic receptor. Presynaptic neurotoxins interfere with the release of acetylcholine from the motor nerve terminals and are valuable tools for the investigation of the mechanism of transmitter release. To date, complete amino acid sequences of 25 short neurotoxins, 22 long neurotoxins and 21 cardiotoxins from the venoms of elapid snakes and of sea snakes have been elucidated and they show a great degree of homology. The complete disulfide pairing in several neurotoxins were also located in corresponding positions. A great deal of work involving physicochemical experiments and chemical modifications of neurotoxins have provided us with valuable information on the structure of snake neurotoxins in relation to their biological activities. This review is focused on the chemistry and structure-function relationships of both postsynaptic and presynaptic neurotoxins.
TL;DR: In this paper, the shape change of zinc-silver oxide secondary cells of an industrial type was studied and the extent of shape change is directly affected by the rate of discharge and charge, and the ZnO content of the electrolyte.
Abstract: Zinc electrode shape changes resulting from cell cycling have been studied. Experiments have been performed using zinc-silver oxide secondary cells of an industrial type. The results indicate that the extent of shape change is directly affected by the rate of discharge and charge, and the ZnO content of the electrolyte. The zinc electrode shape change can be mitigated by adding to the edge sections of the separator system a layer of non-woven fabric treated with Fe(OH)2, The extent of shape change can also be reduced by increasing the separator thickness at the plate periphery. The orientation of the zinc electrode with respect to the earth's gravitational field (horizontally or vertically) on cycling, and the preparation methods for the zinc electrode (electrodeposition or slurry paste) have no apparent effect on the extent of zinc electrode shape change resulting from cell cycling.
TL;DR: In this paper, the erneute Untersuchung von Pteris inaequalis BAKER var. aequata (MIQ.) TAGAWA ergab zwei neue Verbindungen, Hydroxymaltol-3-O-β-D-glukosid (I) und 2-Deoxy-Dglukonsauremethylester (II)
Abstract: Die erneute Untersuchung von Pteris inaequalis BAKER var. aequata (MIQ.) TAGAWA ergab zwei neue Verbindungen, Hydroxymaltol-3-O-β-D-glukosid (I) und 2-Deoxy-D-glukonsauremethylester (II). I wurde ebenfalls aus Pteris formosana BAKER isoliert.
TL;DR: The conformation of the main chain of cobrotoxin in the native unperturbed state, in the partially reduced and in the completely reduced forms are the coexistence of beta-pleated sheet with random-coil structure, predominantly Random coil, and predominantly random coil with the existence of an alpha-helix type structure.
TL;DR: In this article, a novel McLafferty-type rearrangement was found to be the most facile fragmentation of (E)-1-alkylsulfonyl-2-phenylethenes and the migratory aptitudes for different kinds of hydrogen involved has been qualitatively estimated as benzylic ∼tertiary>secondary>primary.
Abstract: A novel McLafferty-type rearrangement has been found to be the most facile fragmentation of (E)-1-alkylsulfonyl-2-phenylethenes and the migratory aptitudes for different kinds of hydrogen involved has been qualitatively estimated as benzylic ∼tertiary>secondary>primary.
TL;DR: In this article, a theoretical calculation of the short circuit current of the Schottky barrier solar cells on applying Fuchs-Sondheimer's theory to calculate the electrical resistivity in thin metal films is presented.
Abstract: The thickness of the barrier metals on the Schottky solar cells is very critical to the conversion efficiency. A theoretical calculation of the short circuit current of the Schottky barrier solar cells on applying Fuchs-Sondheimer's theory to calculate the electrical resistivity in thin metal films, and Handy's approach to calculate the series resistance on a given configuration of the contact grids shows that the optimum thickness which gives maximum short circuit current closely depends onthe intensity of the illuminating light and on the series resistance of the device. The optimum thickness shifts toward thicker film as the illuminating light or the series resistance increases. Fabrication of these devices on MIS solar cells indicates that the monitored optimum thickness satisfactorily agrees with the theoretical values.
13 Nov 1978
TL;DR: This paper proposes the use of hash coding to guide the global search for nearest neighbor searching and believes that the method is efficient because hashing is easy to implement and fast to execute.
Abstract: All of the existing nearest neighbor searching techniques divide the searching into two parts: A global searching and a local searching. In order to minimize the number of records to be examined, the global searching must be a very sophisticated one such that the initial local searching will be confined to a very small region. This kind of global searching is usually very time-comsuming. In this paper, we propose the use of hash coding to guide the global search. Given a record, we hash it to an address and the initial searching is to be started by searching records stored in that address. We believe that our method is efficient because hashing is easy to implement and fast to execute. In other words, if our method is used, the global searching time will be very short.
TL;DR: In this paper, five progressions of fluorescence lines were found and assigned as the fluorescence of 35 Cl 35 Cl and 37 Cl 37 Cl isotopic molecules resonantly excited from v = 0 and 1 levels of the X 1 Σ state to the B 3 Π state.
TL;DR: In this paper, a solid uranium amalgam was prepared electrolytically using a two-compartment cell separated with an ion exchange membrane for the purpose of regulating pH value within a narrowly restricted region of 2 to 3.
TL;DR: In this paper, a pulsed beam and TOF technique was used for obtaining good time resolution and for the reduction of random coincidences along the n + p + 8 Be locus.
Abstract: Low-lying excited states of 9 Be and 9 B were investigated in a kinematically complete 9 Be( p , p n ) 8 Be experiment. A pulsed beam and TOF technique was used for obtaining good time resolution and for the reduction of random coincidences along the n + p + 8 Be locus. The ( p + 8 Be) decay probability of the 2.36 MeV state of 9 B was determined to be (19±5)%, while its analog state, the 2.43 MeV state of 9 Be, decays (11±2)% into n + 8 Be when the γ-decay is neglected. The existence of the first excited state of 9 B around E x ≃1.6 MeV cannot be confirmed. However, there is some evidence of a group of events on the p + n + 8 Be locus at E x ( 9 B)=2.1 MeV.
TL;DR: In this article, the adsorptions of an ordered monolayer of the hydrogen-like atoms and the halogenlike atoms, respectively on the (100) surface of MgO are investigated using the finite layers crystal formalism.
Abstract: The adsorptions of an ordered monolayer of the hydrogen-like atoms and the halogen-like atoms, respectively on the (100) surface of MgO are investigated using the finite layers crystal formalism. The electronic structure of the surface is described within the LCAO interpolation scheme. The adatoms, which are represented by a single non-degenerate energy level, are placed on the surface in the on-site (1×1) configuration. The effect of the chemisorption coupling strength on the surface states is discussed in detail. Local Densities of States (LDS) of the outer layers of the chemisorbed system are studied for the symmetry points of the Surface Brillouin Zone (SBZ). The energy band structure of the chemisorbed system over the SBZ are presented.
TL;DR: In this paper, it was shown that the result of the HOMO-HOMO interaction reinforces that of the LUMO-LUMO interaction, and that the Woodward-Hoffmann rule is actually taken into account implicitly when the selection rule based solely on the LLM interaction is applied.
TL;DR: A mathematical analysis of a vortex which is generated by a stationary tower with a partially opening top and directed by vertical vanes is presented in this paper, where a concentrated vortex and higher pressure drop can be obtained from this tornado-type wind-energy system.