[en] Highlights: • The general trends of energetics of rare gases in UO_2 are reported. • The vdW corrections for rare gases in UO_2 are firstly described. • Chemical interactions exist between Xe and UO_2. - Abstract: First-principles density functional theory–generalized gradient approximation methods have been used to calculate the energetics (incorporation energy, formation energy and binding energy) of rare gases (He, Ne, Ar, Kr and Xe) at the three incorporation sites (octahedral interstitial, uranium and oxygen vacancies) of uranium dioxide. The Hubbard parameter U and van der Waals corrections have been used to describe the strongly correlated electronic behavior of uranium 5f electrons and the weak interactions of rare gases, respectively. The results indicate that the energetics of rare gases depend significantly on the incorporation sites and on the atomic properties such as atomic radius. All rare gases considered here are energetically unfavorable at the three incorporation sites. However, rare gases exhibit significant binding ability to both U and O vacancies. The main trends of relative stability of rare gases generally reflect a size effect: the rare gases become more unstable with increasing atomic number. Electronic structures of these systems containing rare gases also exhibit general trends in their relative stability and charge-transfer character.

[en] Analyzing the domestic status of High voltage switch cabinet temperature monitoring, the advantages of the optical fiber Bragg grating temperature sensor used in high voltage switch cabinet was pointed out. Structure scheme of the system based on the high speed digital signal processor (DSP) was proposed by introducing the optical fiber sensor and the wavelength scanning method. The higher fitting degree function is given after analyzing the relationship between the peak wavelength and temperature. (authors)

[en] Objective: To evaluate the point plaster therapy with ginger powder combined with ondansetron hydrochloride in preventing nausea and vomiting usually occurred after platinum-based interventional chemotherapy in patients with primary or metastatic liver cancer, and to compared its effectiveness with that by using ondansetron hydrochloride only. Method: Sixty-two patients with primary or metastatic liver cancer, who were scheduled to receive platinum-based interventional chemotherapy, were randomly and equally divided into two groups with 31 cases in each group. The patients in the study group (n = 31) were given point plaster therapy, i.e. externally applying ginger powder (20 g) to the point of Shenque, for four days together with arterial infusion of ondansetron hydrochloride (8 mg) during interventional procedure,while the patients in the control group (n = 31) were given point plaster therapy with placebo (potato powder) together with arterial infusion of ondansetron hydrochloride (8 mg) during interventional procedure. The questionnaire of INVR (index form for evaluating nausea and vomiting) was used to assess the effectiveness, and the results were compared between two groups. Results: The incidence of nausea and vomiting in study group was significantly lower than that in control group at all observed points of time during the period of 0 -72 hours after the treatment (P < 0.05). The occurrence of retching in study group was significantly lower than that in control group (P < 0.05) for the whole observed period except for the period from 49 to 60 hours after chemotherapy (P > 0.05). After the treatment the scores of nausea, vomiting and retching in the study group were 0.45, 0.25 and 0.19 respectively, while these in the control group were 2.77, 0.87 and 0.97 respectively, the differences between two groups were statistically significant (P < 0.05). Conclusion: The external application of ginger powder to points of Shenque can markedly decrease the incidence and severity of nausea and vomiting after platinum-based interventional chemotherapy in patients with primary or metastatic liver cancer. (authors)

[en] The energy density of carbon microtube bundles (CMTBs) is usually low and the preparation process is complex. After carbonization, washing and activation, the prepared metaplexis shell-based carbon microtube bundles (MS-CMTBs) not only have an open structure, but also a rich porous structure on the tube wall. The pulsed electrooxidation technology can promote the formation of functional groups on the tube wall and further enhance the energy density of the material. After assembling the electrooxidized material into an all-solid-state supercapacitor, the capacitor has a capacity of 15.1 Wh kg⁻¹ at 0.5 A g⁻¹ and a capacity retention rate of 95.9% after 10 000 cycles at 10 A g⁻¹, indicating that these functional groups are relatively stable. The result shows that the MS-CMTBs before pulsed electrooxidation are more suitable as positive electrode materials, while the electrooxidized material can be either a positive or negative electrode material. This work provides an idea for the design and development of electrode materials in high-performance all-solid-state supercapacitors. (paper)

[en] To unravel the interplay between the strong electronic correlation and itinerant-localized dual nature in typical f electron systems, we employed the density functional theory in combination with the single-site dynamical mean-field theory to systematically investigate the electronic structures of CeSb and USb. We find that the 4f states in CeSb are mostly localized with a weak quasi-particle resonance peak near the Fermi level. Conversely, the 5f electrons in USb display partially itinerant features, accompanied by mixed-valence behavior and prominent valence state fluctuations. Particularly, the 4f electronic correlations in CeSb are orbital-selective with strikingly renormalized 4f_5/2 states, according to the low-energy behaviors of 4f self-energy functions. It is believed that the strong electronic correlation and fantastic bonding of f states contribute to elucidating the magnetism. (paper)

[en] Under high pressure, cerium exhibits three distinct phases, namely , , and ϵ-cerium. It is unclear whether the 4f electronic correlations will play a vital role in these phases or not. By utilizing the combination of traditional density functional theory and single-site dynamical mean-field theory, we tried to calculate the electronic structures of cerium’s high-pressure phases. Their momentum-resolved spectral functions, total and 4f partial density of states, local self-energy functions, and 4f electronic configurations were exhaustively studied. The calculated results show that the correlated 4f bands strongly hybridize with the conducting spd bands around the Fermi level. The Matsubara self-energy functions exhibit Fermi-liquid like characteristic in the low-frequency regime. In addition, the fluctuations among the 4f atomic eigenstates are somewhat prominent (especially for the ϵ phase), which lead to slight modification of the 4f occupancy. It is suggested that the 4f electrons in these phases tend to be itinerant. (paper)

[en] We employed a state-of-the-art first-principles many-body approach, namely the density functional theory in combination with the single-site dynamical mean-field theory, to study the 4f electronic structures in cerium monopnictides (CeX, where X = N, P, As, Sb, and Bi). We find that the 4f electrons in CeN are highly itinerant and mixed-valence, showing a prominent quasiparticle peak near the Fermi level. On the contrary, they become well localized and display weak valence fluctuation in CeBi. It means that a 4f itinerant-localized crossover could emerge upon changing the X atom from N to Bi. Moreover, according to the low-energy behaviors of 4f self-energy functions, we could conclude that the 4f electrons in CeX also demonstrate interesting orbital-selective electronic correlations, which are similar to the other cerium-based heavy fermion compounds. (paper)

[en] The microbial colony-forming unit (cfu) in dehydrated vegetable and condiment was determined by using ATP bioluminescence method. The result showed that bioluminescence of ATP was correlative to the microbial cfu obviously. The detecting time was within 1-2 h. This method could be applied to determine micro load of products before irradiation sterilization. (authors)

[en] The Power system electromagnetic interference simulation calculation software package CDEGS was used to build Ultra high voltage (UHV) AC transmission line models to simulate AC 1000 kV single-circuit wine glass tower, 1000 kV double-circuit umbrella-shaped tower, and 1000 kV/500 kV (the distribution of electromagnetic interference of 220 kV) mixed voltage transmission lines on the same tower to the pipeline. A systematic study was conducted on the different conductor phase sequence arrangement with different operating conditions and different nominal heights of 1000 kV/500 kV (220 kV) four-circuit mixed voltage transmission line on the same tower. The results showed that the electromagnetic interference of the 1000 kV/500 kV mixed voltage four-circuit transmission line on the same tower to the pipeline was much smaller than both the 1000 kV single wine glass transmission line and 1000 kV double-circuit umbrella-shaped transmission line. Under different operating conditions, the voltage level was more susceptible to the electromagnetic influence of the pipeline compared to the distance of the transmission line from the buried pipeline. A 1000 kV positive and reverse phase sequence arrangement was more critical than 500 kV (200 kV) phase sequence arrangement. When 1000 kV reverse phase sequence and 500 kV/200 kV in-phase sequence were arranged, the amplitude of induced voltage along the pipeline was found to be the smallest. The results have important practical engineering significance for the UHV transmission project and for the safe operation of oil and gas pipelines. Moreover, the results can provide a certain reference for related engineering designs. (authors)

[en] A common-base four finger InGaAs/InP double heterostructure bipolar transistor (DHBT) has been designed and fabricated using triple mesa structure and planarization technology. All processes are on 3-inch wafers. The area of each emitter finger is 1 × 15 μm². The maximum oscillation frequency (f_max) is 325 GHz and the breakdown voltage BV_CBO is 10.6 V, which are to our knowledge both the highest f_max and BV_CBO ever reported for InGaAs/InP DHBTs in China. The high speed InGaAs/InP DHBT with a high breakdown voltage is promising for submillimeter-wave and THz electronics. (semiconductor devices)