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Showing papers by "National Tsing Hua University published in 1977"


Journal ArticleDOI
TL;DR: A method for the sequential mapping of points in a high-dimensional space onto a plane is presented, where whenever a new point is mapped, its distgnces to two points previously mapped are exactly preserved.
Abstract: A method for the sequential mapping of points in a high-dimensional space onto a plane is presented. Whenever a new point is mapped, its distgnces to two points previously mapped are exactly preserved. On the resulting map, 2M -3 of the original distances can be exactly preserved. The mapping is based on the distances of a minimal spanning tree constructed from the points. All of the distances on the minimal spanning tree are exactly preserved.

165 citations


Journal ArticleDOI
TL;DR: In this paper, the existence of non-uniform inflation solutions in a closed end, initially cylindrical elastic membrane is proved by introducing plausible general constitutive assumptions, which suggests a simple and accurate method for directly determining the strain energy function over a wide range of strain.
Abstract: The existence of non-uniform inflation solutions in a closed end, initially cylindrical elastic membrane is proved by introducing plausible general constitutive assumptions. The deformation eventually reaches a steady progressive pattern under a constant internal pressure. Such deformations will actually occur because they require less work than the corresponding uniform deformations of the same membrane enclosing same amounts of ideal gas. The strain energy at each particle can be expressed algebraically in terms of the extension ratios and other measurable quantities. This suggests a simple and accurate method for directly determining the strain energy function over a wide range of strain.

28 citations


Journal ArticleDOI
01 Jan 1977-Toxicon
TL;DR: Specific neutralizing capacities of the non-precipitating antibody and its papain fragment increased 23- and 27·6-fold, respectively, over that of the antisera, which may lead to a substantial improvement in the therapy of victims of snake bites.

17 citations


Journal ArticleDOI
TL;DR: In this article, a new Indan-1-ol-Derivat aus den oberirdischen Teilen von Pteris wallichiana AGARDH was identifiziert.
Abstract: Ein neues Indan-1-ol-Derivat aus den oberirdischen Teilen von Pteris wallichiana AGARDH. wurde als 1 (R), 2 (R), 3 (R)-1, 3-Dihydroxy-2, 5, 7-trimethyl-6-hydroxyathyl-indan-1-O-β-D-glukosid (I) und ein neues Indan-1-on-Derivat aus den oberirdischen Teilen von P. semipinnata L. als 3-Hydroxy-6-hydroxymethyl-2, 5, 7-trimethyl-indan-1-on (XII) identifiziert.

17 citations



Journal ArticleDOI
TL;DR: In this article, the coefficients in the high temperature series expansions for the zero-field susceptibility and specific heat were derived for the planar classical Heisenberg model with biquadratic interactions.
Abstract: Seven coefficients in the high temperature series expansions for the zero-field susceptibility and the specific heat are derived for the planar classical Heisenberg model with biquadratic interactions. The critical temperatures and the susceptibility exponents are determined for cubic lattices.

11 citations


Journal ArticleDOI
TL;DR: Phylogenetic trees were constructed for 62 venom toxins of snakes of Proteroglyphae suborder using matrix method, with the resulting tree from Minimum Spanning Tree-Cluster Analysis technique having the lowest “percent deviation”.
Abstract: Phylogenetic trees were constructed for 62 venom toxins of snakes of Proteroglyphae suborder using matrix method. The resulting tree from Minimum Spanning Tree-Cluster Analysis technique had the lowest "percent deviation" (8.55). The taxonomic relationship of these toxins agrees very well with zoological opinions. However, the appearance of the tree did not directly provide a plausible evolutionary model for the toxins. A model was derived from nodal ancestral sequence calculations, comparisons between intra- and intergenerical rates of amino acid change, and generally held ideas about protein evolution. According to the model, short neurotoxin is the ancient form of snake venom toxins. The courses of evolution leading to the present intraspecific homologous toxins are explained by gene duplication and allelomorphism.

10 citations


Journal ArticleDOI
01 Dec 1977
TL;DR: In this article, a design method for the deadbeat control of a class of single-input single-output linear time-invariant systems with time polynomial inputs is presented.
Abstract: A design method for the deadbeat control of a class of single-input single-output linear time-invariant systems with time polynomial inputs is presented. This procedure is extremely simple, it is based on the state feedback technique and the investigation of the state equation or the state simulation diagram. The design method is illustrated by a numerical example for a sixth-order system.

10 citations


Journal ArticleDOI
TL;DR: In this article, an experimental investigation on the effect of liquid solidification in a circular tube upon laminar heat transfer was carried out, where a test section of small inner tube diameter was employed to decrease the free convection effects in this experiment.

9 citations




Journal ArticleDOI
TL;DR: An automatic tracking NMR gaussmeter with simplified circuits and with inexpensive solid-state components has been described in this paper, with a sweeping rate as high as 40 G/s and a range of 500 G can be followed.

Journal ArticleDOI
TL;DR: In this paper, the effects of postcuring of styrenated unsaturated polyesters in nitrogen gas, water or its vapor, hexane vapor, dimethyl sulfoxide (DMSO), and dirnethyl formamide (DMF) all at 100°C were investigated.
Abstract: Experimental studies were performed on the effects of postcuring of' styrenated, unsaturated polyesters in nitrogen gas, water or its vapor, hexane vapor, dimethyl sulfoxide (DMSO), and dirnethyl formamide (DMF) all at 100°C It was found that, nitrogen gas and water are inactive, hexane acts as a chain transfer agent, and DMF and DMSO behave as solvents which extract residual styrene monomer and anhydrides from the resins. Post-treatment in inert media can result in further reaction leading to more complete cure as free radicals and residual monomer continue to react. The post-curing reaction is a radical copolymerization. Further condepgation polymerisation does not occur. Post-curing in, hexane vapor1eads to a transfer of the active sites from the radicals to the hexane and to no further radical polymerization.

Journal ArticleDOI
TL;DR: In this article, the resonant fluorescent spectra of gaseous bromine excited by the single longitudinal mode 5145 A radiation of an argon ion laser were investigated and three new transitions were found in addition to the five previously reported.

Journal ArticleDOI
M. H. Yang1, Pai-Shan Chen1, C. L. Tseng1, S. J. Yeh1, P. S. Weng1 
TL;DR: In this paper, Dinonylnaphthalene sulfonic acid (HD) has been used as a preconcentrating agent to enrich trace metal ions and to separate the interfering elements such as Na, K, Cl and Br which normally exist in the natural aqueous systems.
Abstract: Dinonylnaphthalene sulfonic acid (HD) has been used as a preconcentrating agent to enrich trace metal ions and to separate the interfering elements such as Na, K, Cl and Br which normally exist in the natural aqueous systems. Experiments were performed by extracting the ions in the aqueous medium with HD in n-hexane and subsequently back-extracted into a minimal volume of acid solution. Factors influencing the extraction efficiency of the ions of interest were investigated. The preconcentration technique developed in this study was applied to the determination of trace elements in biological and natural water samples by neutron activation analysis.

Journal ArticleDOI
TL;DR: In this article, a powerful argon ion laser was used to excite gaseous chlorine molecules resonantly from the ground electronic state to the excited electronic state, and three progressions of P, R doublets which correspond to the excitation from J=37, 13 and 39 of v=0 of the X1Σ state to v′=22, J′=38; v´=18, J´=12, J''=12 and v''=16, J`=38, respectively, and then decaying to various vibrational levels of the
Abstract: A powerful argon ion laser was used to excite gaseous chlorine molecules resonantly from the X1Σ ground electronic state to the excited electronic state. Three progressions of P, R doublets which correspond to the excitation from J=37, 13 and 39 of v=0 of the X1Σ state to v′=22, J′=38; v′=18, J′=12 and v′=16, J′=38 of the state, respectively, and then decaying to various vibrational levels of the X1Σ state were observed. Of those, only the excitation from v=0, J=38 to v′=22, J′=38 transition has been reported before. Due to the extremely small transition probabilities, the spectral lines are much weaker than those of iodine and bromine. Their positions and their relative intensities were analyzed and compared with the result calculated from the known molecular constants and with the known Franck-Condon factors. Our data are consistent with the calculated results within the range of experimental error.


Journal ArticleDOI
TL;DR: The diffusion coefficient of uranium in refractory metals, such as Ta and W, has been determined by counting the number of thermal neutron fission tracks of the diffused uranium recorded on a mica detector as mentioned in this paper.

Journal ArticleDOI
TL;DR: In this article, a global analysis of the family of two-terminal trajectories is presented, where one terminal point is assumed fixed, and another one varying its position in a fixed direction.

Journal ArticleDOI
TL;DR: In this paper, the spurious thermoluminescence of CaSO 4 : Dy due to ambient gases of oxygen, nitrogen, and argon was investigated as a result of irradiation with 60 Co gamma-rays, 10 MeV X-ray, 3 MeV electrons, and 11 MEV electrons.

Journal ArticleDOI
TL;DR: In this article, the channel cross correlation function and auto-correlation function were used to determine the correlating numbers N d and average width 〈Γ μ 〉.



Journal ArticleDOI
TL;DR: In this article, a simple selection rule for the reaction energy barrier is presented which is based on the HOMO-HOMO overlap repulsion, which states that the most favorable reaction orientation between the two molecules is the one with the least magnitude of the overlap.




Journal ArticleDOI
TL;DR: In this paper, the authors compared the 2 I + 1 rule and the Hauser-Feshbach theory for the 31 P(d, α) 29 Si reaction in the deuteron energy range from 2.0 to 3.0 MeV.
Abstract: The 31 P(d, α) 29 Si reaction has been studied in the deuteron energy range from 2.0 to 3.0 MeV. The excitation functions and angular distributions are obtained for the alpha-groups leading to the seven lowest states of 29 Si. The relative integrated cross sections and the differential cross sections of the excitations at 140° averaged over the incident energies both agree well with those predicted by the Hauser-Feshbach theory, which is concluded to be more preferable than the 2 I +1 rule. The spin cut-off parameter value for the reaction is determined to be σ 2 =9. The averaged differential cross sections for the 31 P(d, p) 32 P reaction are also obtained and compared with the 2 I +1 rule and the Hauser-Feshbach theory.

Journal ArticleDOI
TL;DR: The mass spectra of some halogenated β-sultones which have been determined show some common features as discussed by the authors, such as the absence of molecular or ions and the presence of abundant trihalomethyl and [M-trihexyl]- ions.
Abstract: The mass spectra of some halogenated β-sultones which have been determined show some common features. These include the absence of molecular or ions and the presence of abundant trihalomethyl and [M- trihalomethyl]+ ions. The latter can subsequently lose sulfur dioxide, ions are also observed in high abundance.

Journal ArticleDOI
TL;DR: In this paper, the authors discuss the class of plane, irrotational flows of rigid-perfectly plastic or of a rigid-viscoplastic body, which are either familiar hydrodynamical flows or are geometrically similar to a model flow whose velocity field can be represented in parametric form in terms of the complex error function.
Abstract: We here discuss the class of plane, irrotational flows of a rigid-perfectly plastic or of a rigid-viscoplastic body. Such flows turn out to be of a limited variety: they are either familiar hydrodynamical flows or are geometrically similar to a model flow whose velocity field can be represented in parametric form in terms of the complex error function. Qualitative features of such flows are discussed as well as the motivation for considering them.