[en] In this work, energy levels and quantum defects of 1s²nd bound states and their adjacent continuum states for the lithium atom are calculated with the R-matrix theory, and then the quantum defect function of the 1s²nd channel is obtained, which vary smoothly with the energy based on the quantum defect theory. The obtained quantum defect function is calibrated from more accurate experimental value of higher Rydberg state and used to calculate quantum defects, ionization potentials and transition energies (relative to the 1s²2s ground state) of 1s²nd high Rydberg states of the lithium atom. Present calculations may help in performing measurements of yet unmeasured 1s²nd Rydberg states of this system in future. -- Highlights: •Quantum defects of 1s²nd channel for the lithium atom are calculated. •The QDF of the 1s²nd channel is obtained by the quantum defect theory. •The original QDF is calibrated from more accurate experimental value. •The new QDF is used to calculate term energies of the 1s²nd Rydberg states. •Present calculations help in performing measurements of 1s²nd Rydberg states

[en] This experiment is an autoradiographical study of the healing process in pulp wounds following pulpotomy and direct capping with calcium hydroxide. Experimental, young adult, mongrel dogs were divided into the following two groups: A group: Pulpotomy was performed and the following intervals allowed to lapse between amputation and sacrifice. One hour before sacrifice, 1μCi/gbw ³H-thymidine was injected intravenously (flash labeling). B group: Single pulse labeling was performed either one day (1 spl) or two days (2 spl) after amputation. During the first two days after amputation, pulp stem cells under the cutting surface divided and proliferated, with the proliferative rate reaching a maximum during the second day and decreased gradually from the fourth day after pulpotomy. Cells in the first zone became columnar in shapes and assumed a regular arrangement under the necrotic layer. Though these cells were unlabeled in the A group, they were prominently labeled in the B group. These finding indicate a part of the proliferated undifferentiated mesenchymal cells migrated and regularly arranged beneath the necrotic layer, differentiated into odontoblasts and then produced a dentine bridge. The remaining undifferentiated mesenchymal cells in the second zone reverted to pulp stem cells to accomplish healing. (auth.)

[en] This paper introduce the high voltage frequency control research work of the cycle water pump motor in Qinshan nuclear power company, and provide the primary program and control principle. (authors)

[en] Energies, radiative and Auger transitions of the 1s vacancy resonances 1s2s²2p², 1s2s²2p3p, 1s2s2p³, 1s2p⁴, and 1s2p³3p, ⁴L (L=S, P, D) for the neutral boron atom are calculated using the saddle-point variation and saddle-point complex-rotation methods. Large-scale wave functions are used to obtain reliable results. Relativistic and mass polarization corrections are included by the first-order perturbation theory. The calculated term energies, x-ray wavelengths, and Auger electron energies for these core-excited states are compared with available theoretical and experimental results. Auger electron energies and branching ratios are used to identify high-resolution B Auger spectrum produced in 300 keV B⁺ on CH₄ collision experiment. It is found that the Auger decay of core-excited states of the boron atom gives significant contributions to Auger spectrum in the range of 165–210 eV, and many previously unknown line identifications are presented. - Highlights: • Term energies of the 1s vacancy resonances for B are calculated. • Radiative and Auger transitions for inner-shell excitation of B are calculated. • Auger electron energies and branching ratios are used to identify B Auger spectrum. • Many previously unknown line identifications of B are presented for the first time

[en] This paper mainly addresses the effects of the NH4Cl concentration and etching time on the surface texture of <103>-oriented ZnO:Al films deposited by using direct-current pulse-magnetron reactive sputtering. A mechanism for the etching of the ZnO:Al films by NH4Cl is also proposed. The best surface texture was observed the same as it was etched for 15 min by using a 3.0 wt.% NH4Cl solution. The average reflectivity at wavelengths from 300 nm to 800 nm was sharply reduced to 4.607%. The etching with NH4Cl is closely related to the preferential <103> orientation rather than the usual preferential <002> orientation. The increased number of defects around the boundary is responsible for the surface texture and the blueshift of the absorption edge of the films.

[en] In this work, ionization potentials and quantum effects of 1s²np²P Rydberg states of lithium are calculated based on the calibrated quantum defect function. Energy levels and quantum defects for 1s²np²P bound states and their adjacent continuum states are calculated with the R-matrix theory, and then the quantum defect function of the 1s²np (n ≥ 7) channel is obtained, which varies smoothly with the energy based on the quantum defect theory. The accurate quantum defect of the 1s²7p²P state derived from the experimental data is used to calibrate the original quantum defect function. The new function is used to calculate ionization potentials and quantum effects of 1s²np²P (n ≥ 7) Rydberg states. Present calculations are in agreement with recent experimental data in whole

[en] Amine-functionalized nanoporous materials can be prepared by the incorporation of diverse organic amine moieties into the pore structures of a range of support materials, such as mesoporous silica and alumina, zeolite, carbon and metal organic frameworks (MOFs), either by direct functionalization or post-synthesis through physical impregnation or grafting. These hybrid materials have great potential for practical applications, such as dry adsorbents for postcombustion CO_2 capture, owing to their high CO_2 capture capacity, high capture selectivity towards CO_2 compared to other gases, and excellent stability. This paper summarizes the preparation methods and CO_2 capture performance based on the equilibrium CO_2 uptake of a range of amine-functionalized nanoporous materials

[en] In this study, the effects of adsorption kinetics, solid concentration (C_p) and initial concentration (C₀) on adsorption characteristics were analyzed. The experimental conditions are as follows: C_p = 100 g · L^-1, C₀ = 2.20 E-08 mol · L^-1, the observed percentage of sorption increases exponentially with time at first. In this stage, the adsorption process is mainly controlled by physical adsorption and ion exchange mechanism, and the adsorption tends to equilibrium after 5 days. When C_p is between 0.25 ∼ 100 g · L^-1, the distribution coefficient of ⁹⁰Sr decreases obviously with the increase of C_p. and the reversibility of adsorption system decreases obviously with the increase of C_p. The system satisfies Freundlich isothermal linear adsorption at 1.47 E-12 ∼ 1.46 E-09 mol ∼ L^-1, and the distribution coefficient of ⁹⁰Sr adsorbed and desorbed on surface sediments remains unchanged with the increase of C₀. (authors)

[en] [Background] The migration of radionuclides carried by water flow in aquifer porous media is a complex physical and chemical process. [Purpose] This study aims to accurately and truly reflect the nuclide transportation in the groundwater by physical experiments and numerical simulation techniques. [Methods] First of all, the sand medium in arid area was taken as the research object, and a soil column device for saturated sandy soil dispersion and permeability test was developed for experimental test. Then, the U and ²³⁸Pu were arranged in the form of liquid point source in the form of liquid point source in the intake section of the soil column, respectively, and the concentration distribution of nuclides in the space of the soil column was measured after the test cycle. Finally, Hydrus-3D was used to establish a three-dimensional numerical model of nuclide migration and to fit the relevant experimental parameters. [Results] The experimental results showed that U migrated downward 24.3 cm along the water flow direction in soil column after 14 days, the distribution coefficient was 35 mL · g^-1, the longitudinal dispersion was 22 cm, and the transverse dispersion was 25 cm. ²³⁸Pu migrated downward 2.1 cm along the water flow direction in soil column after 140 days, the peak concentration was 0.47 ng · cm^-3, the distribution coefficient was 6500 mL · g^-1, the longitudinal dispersion was 2 cm, and the transverse dispersion was 25 cm. The different migration curves of U and ²³⁸Pu in heterogeneous test soil columns are mainly related to the adsorption and retention of sand media and solutes. [Conclusions] The proposed experimental method for nuclide migration in aquifer porous media can provide support for the study of the migration and transformation in soil media. (authors)

[en] The effects of ZnO glass addition on the microwave dielectric properties of Ni_0.5Ti_0.5NbO₄ (NTN) ceramics prepared by solid-state reaction method have been investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive spectroscopy (EDS). The pure NTN ceramics have ε_r of 60.6, Q × f value of 70,100 GHz, and τ_f value of 76.6 ppm ^°C⁻¹ sintered at 1140 °C for 6 h. The results indicate that the addition of ZnO can effectively benefit the densification and further improve the dielectric constant. Moreover, the lower sintering temperature of NTN ceramics from 1140 to 930 °C is obtained by the addition of ZnO glass. However, an excess of ZnO suppresses the grain growth and decreases the Q × f value of NTN ceramics. The NTN ceramics with 2 wt% ZnO sintered at 930 °C for 6 h possess promising microwave dielectric properties: ε_r of 56.3, Q × f value of 67,000 GHz, and τ_f value of 78.6 ppm °C⁻¹, which shows that the materials are suitable for low-temperature co-fired ceramics applications. - Highlights: • Microwave dielectric properties of NTN ceramics with sintering aid for LTCC applications were investigated. • ZnO-doped NTN ceramics decreased the sintering temperature to 930 °C for LTCC applications. • The ε_r of 56.7, Q × f of 67,000, and τ_f of +78.6 were obtained for 2 wt% ZnO-doped NTN ceramics sintered at 930 °C for 6 h. • A significant maintenance of dielectric properties was achieved by ZnO-doped NTN system sintered at 930 °C