Showing papers by "Nankai University published in 1993"
TL;DR: In this article, it was shown that the Bose-Einstein condensation of a q-deformed ideal Bose gas is not a first-order phase transition but a second-order one.
71 citations
TL;DR: In this article, for optimal assignment of factors to columns of a 4'2 n design, the authors considered extensions of the minimum aberration criterion for the 2-level designs.
Abstract: SUMMARY For optimal assignment of factors to columns of a 4'2 n design, we consider extensions of the minimum aberration criterion for the 2-level designs. Minimum aberration 412n and 422n designs in 16 and 32 runs are obtained and tabulated. Some results on the wordlength patterns and design classification are obtained.
61 citations
TL;DR: In this paper, the second derivative or curvature of the surface of the perturbation-formed surface of a variable, such as the maximum likelihood estimate of a parameter, is evaluated.
Abstract: To examine global and local influence, and their relations for regression models, we study the perturbation-formed surface of a variable, such as the maximum likelihood estimate of a parameter, by evaluating the second derivative or curvature of the surface. (The corresponding slope of this surface is related to the curvature of the likelihood displacement surface of Cook.) Examples show that this approach, with the aid of plots, is helpful not only to discover influential cases including those hidden in an individual global sense but also to understand the nature of influence
56 citations
TL;DR: In this article, the authors measured photoluminescence and Raman spectra for a series of amorphous carbon (a-C:H) films prepared in a RF-plasma CVD system.
Abstract: We have measured photoluminescence (PL) and Raman spectra for a series of amorphous carbon (a-C:H) films prepared in a RF-plasma CVD system. The negative bias voltage was varied between 0V and 950V. The samples seem to consist of two components. One polymeric component has a high band gap and gives strong luminesence above 2.1 eV with 0.6 eV band width. The second component shows the Raman spectrum that is typical for the sp 2 -clusters of hard carbon. We find that the hard carbon component seems to be absent for zero bias voltage. The PL for this sample, however, is strongest. We find a fatiguing of the luminescence during laser excitation. This fatiguing is weaker at 120 K, resulting in a higher PL-efficiency for this temperature.
52 citations
48 citations
TL;DR: In this paper, the crystal and molecular structures of the FeHg complex have been determined by X-ray diffraction and they have been evaluated as homogeneous catalysts on the carbonylation of ethanol to ethyl propionate.
48 citations
45 citations
TL;DR: In this paper, the existence of periodic solutions with prescribed minimal period for even superquadratic autonomous second order Hamiltonian systems defined on Rn with no convexity assumptions was studied.
Abstract: In this paper, we study the existence of periodic solutions with prescribed minimal period for even superquadratic autonomous second order Hamiltonian systems defined on Rn with no convexity assumptions. We use a direct variational approach for this problem on a W1, 2 space of functions invariant under the action of a transformation group isomorphic to the Klein Fourgroup V4 = Z2⊕Z2 to find symmetric periodic solutions, and prove a new iteration inequality on the Morse index by iterating such functions properly. Using these tools and the Mountain-pass theorem, we show that for every T > 0 the abobe mentioned system possesses a T-periodic solution x(t) with minimal period T or T/3, and this solution is even about t = 0, T/2 and odd about t = T/4, 3 T/4.
45 citations
TL;DR: In this article, toxic effects and bioaccumulation factors of organometallic compounds, mainly organotin species, on algae were reported and two species of microalgae were used as test algae: Scenedesmus obliquus as a representative of fresh-water algae, and Dunaliella salina and D viridis as commonly mixed algae which exist abundantly in Tianjin Harbor, China.
Abstract: This paper reports toxic effects and bioaccumulation factors of organometallic compounds, mainly organotin species, on algae We selected two species of microalgae as test algae: one was Scenedesmus obliquus as a representative of fresh-water algae, the other Dunaliella salina and Dunaliella viridis, to represent commonly mixed algae which exist abundantly in Tianjin Harbor, People's Republic of China For comparison, Chlorella vulgaris was also used in this study The toxic effect of ten organometallic compounds on the freshwater alga, S obliquus, was investigated The ten compounds were (as chlorides) tributyltin (TBT); triphenyltin (TPT); trimethyltin (TMT); dibutyltin (DBT); diphenyltin (DPT); dimethyltin (DMT); trimethyl-lead acetate (TML); dimethyl-arsine (DMA) and two new mixed-alkyltin pesticides, dicyclohexylmethylitin acetate (Cy2MTA) and dicyclohexylmethyltin isobutyrate (Cy2MTB) The order of toxicity of these compounds in fresh-water algae, S obliquus, was TBT>TPT>DBT> Cy2MTA=TML> Cy2MTB>DPT>TMT>DMA>DMT, according to 96 h EC50 values attained The ten toxicants were divided into three groups according to the sequence of their toxicities; (a) TBT, TPT; (b) DBT, Cy2MTA, TML, Cy2MTB; (c) DPT, TMT, DMA, DMT In each group the EC50 values of each compound were quite similar The difference of EC50 values between two vicinal groups was approximately one order of magnitude The bioconcentration factor (BCF) of TBT and TPT compared with water in the freshwater alga S obliquus was >332 × 105 and 114 × 105, respectively The BCF of the marine mixed algae was >348 × 105 The marine microalga, Chlorella vulgaris, was adaptable to TBT at lower concentration TBT at high concentration only inhibited the growth of S obliquus, but it could cause chlorosis anddisintegration of D salina and D viridis Resistance to toxicity of algae against TBT appears in order as follows: C vulgaris>S obliquus>D salina and D viridis TBT was metabolized by algae to a less toxic product, DBT The existence of algal cells accelerated the concentration reduction of TBT The toxic mechanism of TBT was also studied
45 citations
TL;DR: Me2Si-η5-C5H4(CO)Fe(CO), 2Fe 2Fe, 3Fe, 4Fe, 5H4H4SiMe2 (1) was synthesized by reaction of 1,2-bis (cyclopentadienyl)tetramethyldisilane and pentacarbonyliron.
39 citations
TL;DR: One can attribute the origin of optical nonlinearities of Chinese tea liquid to laser-heating-induced nonlinear refraction while one irradiates the media with a cw He-Ne laser.
Abstract: We employ the z-scan method to distinguish thermally induced nonlinearities from others by varying the beam waist radius and to determine the thermo-optic coefficient of materials. One can attribute the origin of optical nonlinearities of Chinese tea liquid to laser-heating-induced nonlinear refraction while one irradiates the media with a cw He-Ne laser. We also analyze the influence of position dispersion on optical limiting.
TL;DR: In this article, the radical stabilization energies (RSE) were derived from the relative BDE's indicated a general trend of radical destabilization by introducing an electron-withdrawing substituent onto either the remote or the alpha positions of the donor atom.
TL;DR: In this article, the vibrational modes were classified by the factor group analysis method and the spectral bands were assigned to vibrations of the (B 3 O 6 ) 3− ring and BO 4 tetrahedra.
Abstract: Infrared reflectance and Raman spectra of LBO crystals were recorded at room temperature and liquid nitrogen temperature. The vibrational modes are classified by the factor group analysis method and the spectral bands are assigned to vibrations of the (B 3 O 6 ) 3− ring and BO 4 tetrahedra
TL;DR: In this paper, a novel concept of distortion Kolmogorov-chaitin complexity is proposed, which can be regarded as the amount of information about a single message that must be conveyed in order to reproduce it with a bounded distortion.
Abstract: A novel concept of distortion Kolmogorov-chaitin complexity is proposed. Bearing analogy to ordinary Kolmogorov-Chaitin complexity that represents the information content of a single message, distortion Kolmogorov-Chaitin complexity can be regarded as the amount of information about a single message that must be conveyed in order to reproduce it with a bounded distortion. This explanation is justified by the properties of distortion Kolmogorov-Chaitin complexity and the equivalences between distortion Kolmogorov-Chaitin complexity and the rate-distortion function, which are analogous to those between ordinary Kolmogorov-Chaitin complexity and the Shannon entropy. Some implications for universal almost sure data compression are also discussed. >
TL;DR: In this article, the authors present comparative results on dispatching rules in job shop scheduling under various shop load ratio and various due date tightness conditions, and analysis of variance is used.
TL;DR: In this article, the curvature of the perturbation-formed surface of residual sum of squares (RSS) and multiple potentials (MPS) was used to identify influential points.
TL;DR: The poisoning by Al(3+) of the root tip cells of Allium sativum may result from the uptake and accumulation of Al and inhibition of Ca uptake, distribution of physiological activities of calmodulin (CaM) and the inhibition of some enzyme reactions.
TL;DR: In this paper, the pad-dry steam and pad-de-bake finishing of tussah silk fabric with triglycidyl ether of glycerol in the presence of catalysts has been investigated.
Abstract: The pad-dry-steam and pad-dry-bake finishing of tussah silk fabric with triglycidyl ether of glycerol in the presence of catalysts has been investigated. Potassium thiocyanate was found to be the most effective accelerating agent for this purpose. The optimum treatment conditions for either steaming or baking are discussed. The reaction mechanism involving the formation of an epithioxide intermediate is proposed and was confirmed by determination of the sulphur content of the fabric. The processes described could be readily adapted for commercial exploitation.
TL;DR: In this article, four binuclear complexes have been synthesized, namely [Cu(oxae)Ni(L) 2 ] (ClO 4 ) 2 ·H 2 O, where oxae denotes the N,N′-bis(20aminoethyl)oxamido dianion and L denotes 2,2′-bipyridyl (bpy), 4,4′-dimethyl-2,2-, bipyrinyl (Me 2 bpy), 1,10-phenanthroline (phen) or 5-nitro-
TL;DR: In this article, mixed crystals of 5-formyl-1,3-dimethyluracil (1a) and antipyrine (7) were used for solid state photoreaction between 1a and indole.
Abstract: Mixed crystals, prepared by resolidification of the melt of a mixture of 5-formyl-1,3-dimethyluracil (1a) and antipyrine (7) crystals (molar ratio, 1:2.5), and irradiated with a high-pressure mercury lamp under nitrogen, gave a photocondensation product 8a, as in the previously reported solid state photoreaction between 1a and indole. Similarly, irradiation of mixed crystals of substituted benzaldehydes and indole gave the corresponding photocondensation product 3. A mechanism involving an oxetane intermediate 4 was proposed for the formation of 3. The nature of the starting mixed crystals was examined by powder X-ray diffractometry.
TL;DR: In this article, the magnetic susceptibility of Cu3(oxae)3Gd(ClO4)3·H2O was measured over the range 4-300 K and the observed data were successfully simulated by the equation based on the spin-Hamiltonian operator, giving the exchange integral J(CuGd) = 2.72 cm−1.
TL;DR: In this paper, the thermal decarbonylation of metal-metal singly bonded complexes in diglyme has been shown to yield a triply bonded dimer in 51 and 40% yields, respectively.
TL;DR: The adsorption capacity of dimethyltin was higher in natural seawater than in artificial seawater at the same temperature and decreased with increasing salinity.
Patent•
10 Dec 1993TL;DR: Work gloves have a flexibility that is improved by the restriction of the degree of infiltration of the coating so as to produce a thin coating when the outer surface of a knit glove is covered with a coating made of vinyl chloride resin, rubber or the like, and subjected to an antimicrobial and/or deodorizing treatment by a facilitated manufacturing technique as discussed by the authors.
Abstract: Work gloves having a flexibility that is improved by the restriction of the degree of infiltration of the coating so as to produce a thin coating when the outer surface of a knit glove is covered with a coating made of vinyl chloride resin, rubber or the like, and subjected to an antimicrobial and/or deodorizing treatment by a facilitated manufacturing technique. Yarn processed by an antimicrobial and/or deodorizing agent and a water and/or oil repellent agent and non-processed yarn are combined together. A glove is knitted such that the processed yarn appears on the inner surface side of the glove, and the outer surface of the glove is coated with a coating material such as a vinyl chloride resin paste or natural rubber while the infiltration of the coating material into the inner surface is suppressed by the water and oil repellency. Thereby, a flexible coating is obtained, and the inside of the glove that comes into contact with a hand is subjected to an antimicrobial and/or deodorizing treatment.
TL;DR: In this article, solid-state irradiation of mixed crystals prepared by melting a 1:3 molar mixture of indole and phenanthrene followed by resolidifying the melt gave an adduct 2a in 13.5% yield.
Abstract: — Solid-state irradiation of mixed crystals prepared by meltinga 1:3 molar mixture of indole and phenanthrene followed by resolidifying the melt gave an adduct 2a in 13.5% yield. An adduct 2b was obtained by irradiation of the mixed crystals of 3-methylindole and phenanthrene. Irradiation of the same mixtures of indoles and phenanthrene in solution gave no photoproduct. Irradiation of the mixed crystals of indole and naphthalene gave a similar photoadduct 3a, which was also formed in solution. The 1:1 mixed crystals of indole and phenanthrene and of indole and naphthalene were characterized by various spectroscopic methods. Among them powder X-ray diffraction spectral analysis and differential scanning calorimetry revealed that the former mixed crystal is a simple mixture of microcrystals of indole and phenanthrene, while the latter forms a molecular compound.
Patent•
18 Oct 1993TL;DR: In this article, a nickel-hydride alkaline battery was used as a starting and driving power for electric cars, where both negative and positive electrodes use an electrode plate with a net structure to solve the problems of high internal resistance, current collecting and heat releasing.
Abstract: This invention relates to a nickel-hydride alkaline battery. In the battery, both negative and positive electrodes use an electrode plate with a net structure to solve the problems of high internal resistance, current collecting and heat releasing. The battery can be used practically as a starting and driving power for electric automobiles.
TL;DR: In this article, three binuclear Nd(III), Gd (III), and Dy(III) complexes containing the dianion of chloranilic acid (CA) as bridging have been synthesized.
Abstract: Three new binuclear Nd(III), Gd(III) and Dy(III) complexes containing the dianion of chloranilic acid (CA) as bridging have been synthesized, namely Nd2(phen)4(CA)(NO3)4 6H2O, Gd2(phen)4 (CA)(NO3)4 6H2O and Dy2(phen)4(CA)(NO3)4 5H2O (CA = dianion of chloranilic acid, phen = 1,10-phenanthroline). The complexes have been characterized by elemental analyses, IR, electronic spectra, ESR, susceptibility and variable-temperature magnetic susceptibility. The observed susceptibility data were fit to those from the theoritical magnetic equation by a least-squares method, giving the following parameters: J = -0.21 cm−1, g = 2.01, the agreement factor R = 1 × 10−3 for the complex Gd2(phen)4(CA)(NO3)4 6H2O; Δ = −2.36 cm−1, ZJ′ = −0.543 cm−1, g = 1.382, R = 3 × 10−3 for the complex Dy2−(phen)4(CA)(NO3) 5H2O. These indicate the existence of a weak antiferromagnetic spin exchange interaction among the rare earth ions in the complexes.
TL;DR: The exact expression of kinetic energy as a functional of the density for a system of noninteracting fermions, which has been searched for many years, is derived based on the direct method as mentioned in this paper.
Abstract: The exact expression of kinetic energy as a functional of the density for a system of noninteracting fermions, which has been searched for many years, is derived based on the direct method.
TL;DR: In this article, the authors used X-ray photoelectron spectroscopy (XPS) and Auger electron spectrograms (AES) to analyze the surface of a hydrogen storage alloy electrode.