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1990 Volume 6 Issue 2
1990, 6(02): 129-131
doi: 10.3866/PKU.WHXB19900201
Abstract:
The low temperature infrared spectroscopy was applied to investigate the adsorp-tion of NO and CO on CuO/γ-Al_2O_3. The measured infrared bands were asigned. The results of alternate adsorption and coadsorption of NO and CO exhibited that Cu~(2+) and...
The low temperature infrared spectroscopy was applied to investigate the adsorp-tion of NO and CO on CuO/γ-Al_2O_3. The measured infrared bands were asigned. The results of alternate adsorption and coadsorption of NO and CO exhibited that Cu~(2+) and...
1990, 6(02): 132-133
doi: 10.3866/PKU.WHXB19900202
Abstract:
In this paper we defined regidly the microscopic hole existing in molten salt and established the embedding method for locating the hole and calculating the size of the hole. To describe the statistical distribution of the microscopic holes better we...
In this paper we defined regidly the microscopic hole existing in molten salt and established the embedding method for locating the hole and calculating the size of the hole. To describe the statistical distribution of the microscopic holes better we...
1990, 6(02): 134-138
doi: 10.3866/PKU.WHXB19900203
Abstract:
The kinetics of anodic O_2 evolution on Ti/RuO_2+TiO_2 anodes was studied in acid solutions, by with two Tafel regions have been confirmed. At low current densities i.e. the first Tafel region ?φ/lgi=2.303RT/((1+β)F, whereas at high cds i. e. second ...
The kinetics of anodic O_2 evolution on Ti/RuO_2+TiO_2 anodes was studied in acid solutions, by with two Tafel regions have been confirmed. At low current densities i.e. the first Tafel region ?φ/lgi=2.303RT/((1+β)F, whereas at high cds i. e. second ...
1990, 6(02): 139-145
doi: 10.3866/PKU.WHXB19900204
Abstract:
The bi-exponential decay of the luminescence of electronically excited uranyl ions in perchloric acid has been investigated with detailed study of the time resolved lu-minescence spectra and Raman spectra of uranium. While the U(Ⅵ) concentration is i...
The bi-exponential decay of the luminescence of electronically excited uranyl ions in perchloric acid has been investigated with detailed study of the time resolved lu-minescence spectra and Raman spectra of uranium. While the U(Ⅵ) concentration is i...
1990, 6(02): 146-150
doi: 10.3866/PKU.WHXB19900205
Abstract:
The nature and mechanism of solubilization of the block copolymer of polyoxye-thylene-polyoxypropylene glycols-Pluronic were investigated and the results showed that only the samples with appropriate HLB value were valid for solubilization. In aqueou...
The nature and mechanism of solubilization of the block copolymer of polyoxye-thylene-polyoxypropylene glycols-Pluronic were investigated and the results showed that only the samples with appropriate HLB value were valid for solubilization. In aqueou...
1990, 6(02): 151-158
doi: 10.3866/PKU.WHXB19900206
Abstract:
In this paper the bonded tableau method for many-electron systems, which was recently proposed by authors, is exploited to study the chemical interactions of sub-systems. Two approaches are given for constructing symmetry adapted states of par-tition...
In this paper the bonded tableau method for many-electron systems, which was recently proposed by authors, is exploited to study the chemical interactions of sub-systems. Two approaches are given for constructing symmetry adapted states of par-tition...
1990, 6(02): 159-162
doi: 10.3866/PKU.WHXB19900207
Abstract:
The voltammetric characteristics of RuO_2 electrode has been studied by means of cyclic voltammetry and pulse polarography. In the potential range of 0.2-0.8 V, there are two redox reactions as follows:
RuOOH<+>RuO_2+H~++e RuO_2+
H_2O<=>RuO_3+2H~++2ebu...
The voltammetric characteristics of RuO_2 electrode has been studied by means of cyclic voltammetry and pulse polarography. In the potential range of 0.2-0.8 V, there are two redox reactions as follows:
RuOOH<+>RuO_2+H~++e RuO_2+
H_2O<=>RuO_3+2H~++2ebu...
1990, 6(02): 163-168
doi: 10.3866/PKU.WHXB19900208
Abstract:
In this paper, we have studied the mechanism of intermolecular energy transfer of Rh6G and Cresyl Violet which form a donor-acceptor pair in mixture solution. The relationship between the fluorescence intensity of Cresyl Violet and its concentration ...
In this paper, we have studied the mechanism of intermolecular energy transfer of Rh6G and Cresyl Violet which form a donor-acceptor pair in mixture solution. The relationship between the fluorescence intensity of Cresyl Violet and its concentration ...
1990, 6(02): 169-176
doi: 10.3866/PKU.WHXB19900209
Abstract:
Relationships between the activity of a certain component and the product of ac-tivities of three components, Φ, which may be the activity of the compound, on boundaries of two-phase region in ternary systems have been studied. An important formula e...
Relationships between the activity of a certain component and the product of ac-tivities of three components, Φ, which may be the activity of the compound, on boundaries of two-phase region in ternary systems have been studied. An important formula e...
1990, 6(02): 177-182
doi: 10.3866/PKU.WHXB19900210
Abstract:
The mechanism of the thermolysis of oxetane to form ethylene and formaldehyde has been studied in detail by semiempirical molecular orbital theory. The calculations have been carried out using a new general purpose quantum mechanical molecular model ...
The mechanism of the thermolysis of oxetane to form ethylene and formaldehyde has been studied in detail by semiempirical molecular orbital theory. The calculations have been carried out using a new general purpose quantum mechanical molecular model ...
1990, 6(02): 183-189
doi: 10.3866/PKU.WHXB19900211
Abstract:
Acidity of La~(3+)-exchanged HY zeolite has been studied by the measurements of adsorption on the in-situ IR system and MAS-NMR method. The results show that:
1.The IR bands at 3631 and 3556 cm~(-1) are all assigned to hydroxyl group of strong acidic...
Acidity of La~(3+)-exchanged HY zeolite has been studied by the measurements of adsorption on the in-situ IR system and MAS-NMR method. The results show that:
1.The IR bands at 3631 and 3556 cm~(-1) are all assigned to hydroxyl group of strong acidic...
1990, 6(02): 190-195
doi: 10.3866/PKU.WHXB19900212
Abstract:
The impedance plane plots for four ISEs, two liquid membrane bile salt ISEs and two PVC membrane Ca ISEs based on ETH 1001 and phosphate, were measured from 65 kHz to 0.01 Hz. All the impedance spectra obtained showed two semicircles and a Warburg im...
The impedance plane plots for four ISEs, two liquid membrane bile salt ISEs and two PVC membrane Ca ISEs based on ETH 1001 and phosphate, were measured from 65 kHz to 0.01 Hz. All the impedance spectra obtained showed two semicircles and a Warburg im...
1990, 6(02): 196-202
doi: 10.3866/PKU.WHXB19900213
Abstract:
The rate constant of very fast chemical reaction generally can be measured by electrochemical methods, but can not by the thin layer electrochemical methods because of the influence of diffussion effect. Long optical path length thin layer cell (LOPT...
The rate constant of very fast chemical reaction generally can be measured by electrochemical methods, but can not by the thin layer electrochemical methods because of the influence of diffussion effect. Long optical path length thin layer cell (LOPT...
1990, 6(02): 203-208
doi: 10.3866/PKU.WHXB19900214
Abstract:
The densities of the mixtures of N,N-Dimethylformamide (DMF) and water(w) have been measured at ten temperatures from 278.15 K to 318.15 K with the vibra-tingtube density meter(Anton Paar Model DMA602). Then the excess molal volumes V~E of solutions ...
The densities of the mixtures of N,N-Dimethylformamide (DMF) and water(w) have been measured at ten temperatures from 278.15 K to 318.15 K with the vibra-tingtube density meter(Anton Paar Model DMA602). Then the excess molal volumes V~E of solutions ...
1990, 6(02): 209-214
doi: 10.3866/PKU.WHXB19900215
Abstract:
A dynamic algebraic h_(15) is formed by using the semiclassical potential surface for AB+CD. The V-V energy transfer and the expectation of the potential are calculated; the selection rules are discussed under the first-order approximation of the gro...
A dynamic algebraic h_(15) is formed by using the semiclassical potential surface for AB+CD. The V-V energy transfer and the expectation of the potential are calculated; the selection rules are discussed under the first-order approximation of the gro...
1990, 6(02): 215-219
doi: 10.3866/PKU.WHXB19900216
Abstract:
The interaction of water with solvents in H_2O-TBP-CCl_4 system and H_2O-p-dio-xan-CCl_4 system is studied with IR method. The absorbances of free water, 1:1 and 1:2 complex are observed and the absorbance frequencies of each species are assigned. In...
The interaction of water with solvents in H_2O-TBP-CCl_4 system and H_2O-p-dio-xan-CCl_4 system is studied with IR method. The absorbances of free water, 1:1 and 1:2 complex are observed and the absorbance frequencies of each species are assigned. In...
1990, 6(02): 220-223
doi: 10.3866/PKU.WHXB19900217
Abstract:
The process of glass transition on the non-crystal SeTe_8Sb_1 has been researched using low temperature differential scanning calorimetry (DSC). The following conclusions are deduced: this process is a second-order phase transformation, the stronger ...
The process of glass transition on the non-crystal SeTe_8Sb_1 has been researched using low temperature differential scanning calorimetry (DSC). The following conclusions are deduced: this process is a second-order phase transformation, the stronger ...
1990, 6(02): 224-228
doi: 10.3866/PKU.WHXB19900218
Abstract:
The crystal structures of the title compound (Ⅰ) and (Ⅱ) have been determined by X-ray diffraction. Crystal data are: C_(17)H_(15)NO_3(Ⅰ), triclinic, α=0.7308(2) nm, b=0.8845(3) nm, c=1.1323(3) nm, α=100.03(2)°, β=104.81(2)°, γ=97.20(2)°, V=0.6856(3)...
The crystal structures of the title compound (Ⅰ) and (Ⅱ) have been determined by X-ray diffraction. Crystal data are: C_(17)H_(15)NO_3(Ⅰ), triclinic, α=0.7308(2) nm, b=0.8845(3) nm, c=1.1323(3) nm, α=100.03(2)°, β=104.81(2)°, γ=97.20(2)°, V=0.6856(3)...
1990, 6(02): 229-232
doi: 10.3866/PKU.WHXB19900219
Abstract:
In this paper, two different kinds of B-Z type oscillating reactions have been described. One is the couple catalyzed oscillating reaction with vanillin(OA) as the organic substrate. Another is the uncatalyzed oscillating reaction with 2,7-dihydroxyn...
In this paper, two different kinds of B-Z type oscillating reactions have been described. One is the couple catalyzed oscillating reaction with vanillin(OA) as the organic substrate. Another is the uncatalyzed oscillating reaction with 2,7-dihydroxyn...
1990, 6(02): 233-238
doi: 10.3866/PKU.WHXB19900220
Abstract:
The crystal structures of 2,3,7,8-tetrachlorodibenzo-p-dioxin(2, 3, 7, 8-TCDD) and its analogues have been determined. And the semiempirical INDO calculations for this type of compounds have been undertaken. Their characteristics of electronic struct...
The crystal structures of 2,3,7,8-tetrachlorodibenzo-p-dioxin(2, 3, 7, 8-TCDD) and its analogues have been determined. And the semiempirical INDO calculations for this type of compounds have been undertaken. Their characteristics of electronic struct...
1990, 6(02): 239-245
doi: 10.3866/PKU.WHXB19900221
Abstract:
In this paper, B-02 catalyst, developed by Yanshan Synthetic Rubber Factory and used in two large production plants, was investigated by means of pulse technique and temperature-programmed techniques, as well as XRD and FT-IR techniques. Three relate...
In this paper, B-02 catalyst, developed by Yanshan Synthetic Rubber Factory and used in two large production plants, was investigated by means of pulse technique and temperature-programmed techniques, as well as XRD and FT-IR techniques. Three relate...
1990, 6(02): 246-251
doi: 10.3866/PKU.WHXB19900222
Abstract:
The linear equation of salt effect on phase transformation in the mixtures of nonpolar-nonpolar system and nonpolar-polar system can be proved with the aid of perturbation expansion. The cause of linear equation has been discussed from ther-modynamic...
The linear equation of salt effect on phase transformation in the mixtures of nonpolar-nonpolar system and nonpolar-polar system can be proved with the aid of perturbation expansion. The cause of linear equation has been discussed from ther-modynamic...
1990, 6(02): 252-256
doi: 10.3866/PKU.WHXB19900223
Abstract:
In tbe present paper, the adsorption heats of CO on copper (powder) have been determined by impulsive method with Rigaku TG-DTA-DSC thermal analyzer, Ar as the carrier gas. The sample Cu is prepared by precipitation of copper nitrate. The weight of a...
In tbe present paper, the adsorption heats of CO on copper (powder) have been determined by impulsive method with Rigaku TG-DTA-DSC thermal analyzer, Ar as the carrier gas. The sample Cu is prepared by precipitation of copper nitrate. The weight of a...
