[en] The evaluation for ¹⁹⁷Au(n, 2n)¹⁹⁶Au cross section was performed, the data of this reaction in the neutron energy range from threshold to 30 MeV were given, compared with the evaluation results by Yuan Hanrong et al., Zhao Wenrong et al., Jose Martinez-Rico and Yu Baosheng et al.. The agreement between different evaluations is good. However, the deviations are shown up for the data from ENDF/B-6 and JEF-2.2

[en] An end-conductive cooling approach has been developed to reduce the radial space budget of a synchrotron radiation liner to permit the maximum possible liner tube inner diameter (ID). A thermal model has also been developed to analyze the thermal performance of such liners. This approach is found to be acceptable for a liner in a 5-m-long quadrupole magnet and 3-m-long spool piece, but not for a longer 15-m dipole. The heat transfer and temperature distribution were calculated respectively along the axis of two different liner models: 20 K and 80 K liner with different thicknesses (0.5--2 mm) of liner tubes and different emissivities (0.05--0.3) of liner surface for a variety of magnets. The thermal model is also applied to the case of an 80 K liner connected directly to a 4 K beam position monitor (BPM). In order to utilize the end cooling, a good thermal joint and a compact heat exchanger are designed

[en] The spallation neutron target for intermediate energy proton incident is an important link for accelerator and subcritical reactor of accelerator driven system (ADS). The theoretic programs and Monte-Carlo codes are a useful approach for solving the physics of spallation neutron source. The authors discuss those codes at present work and introduce the application and development of SHIELD code

[en] The research for intermediate energy proton accelerator driven radiologically clean nuclear power system has attracted considerable attention. The spallation neutron source induced by intermediate energy proton-nucleus interaction is a key point and has not solved yet for the transmutation and applications. The theoretical programs related to the spallation neutron source for accelerator driven system (ADS) are discussed at present work

[en] This paper proposes a deep learning network (DLN) as the basis for a bearing fault diagnosis technique, which is constructed by the autoencoders and softmax classifier for the purpose of identifying the various multi-degree bearing fault. Firstly, the ensemble empirical mode decomposition (EEMD) method is used to decompose the original vibration signal into intrinsic mode functions (IMFs). A high dimensionality feature vector is formed by analyzing the statistical parameters in the time domain and the frequency domain of the first several IMFs. Then, this feature vector serves as the input for DLN to classify the bearing fault pattern. In a DLN, an autoencoder performs the unsupervised feature self-learning phase to generate a final significant feature vector for training the softmax classifier. Finally, the parameters of a complete DLN based on stacking auto-encoders and the softmax classifier together is fine-tuned with respect to supervised learning criterion aiming to optimize the classification error. Experimental results have shown a great effect for bearing fault diagnosis based on the proposed DLN. The identification accuracy result has been achieved in the bearing fault status even with the unpredictable defects tests on the inner race and roller element of bearing. Methodologies in this study offer confidence for complex data classification.

[en] Highlights: • This paper presents a LED indictor driving circuit with a PV arrays as its power source. • The perturb-and-observe method is adopted to extract the maximum power of PV arrays. • The proposed circuit structure has a less component counts and higher conversion efficiency. • A prototype of LED indictor driving circuit has been implemented to verify its feasibility. • The proposed hybrid converter is suitable for LED inductor applications. - Abstract: This paper presents a LED indictor driving circuit with a PV arrays as its power source. The LED indictor driving circuit includes battery charger and discharger (LED driving circuit). In this research, buck converter is used as a charger, and forward converter with active clamp circuit is adopted as a discharger to drive the LED indictor. Their circuit structures use switch integration technique to simplify them and to form the proposed hybrid converter, which has a less component counts, lighter weight, smaller size, and higher conversion efficiency. Moreover, the proposed hybrid converter uses a perturb-and-observe method to extract the maximum power from PV arrays. Finally, a prototype of an LED indictor driving circuit with output voltage of 10 V and output power of 20 W has been implemented to verify its feasibility. It is suitable for the LED inductor applications

[en] Taking spherical spiral groove bearing as the research object, the calculation method of oil film flow field of spiral groove bearing was verified and the flow field was analyzed numerically by using the finite volume method. The relative deviations between the numerical results and the approximate analytical solutions are between 1% and 2%. The accuracy of the calculation method is guaranteed. In terms of static characteristics, the axial bearing capacity increases linearly with bearing speed and viscous coefficient, and the friction power increases linearly with viscous coefficient and rotational speed square. In terms of dynamic characteristics, the damping coefficient of spiral groove bearing is independent of rotational speed and only related to viscous coefficient of the medium, and the damping coefficient increases linearly with viscous coefficient. (authors)

[en] In the high-speed rotating special equipment, the gas pressure is exponentially distributed in the radial direction. The existence of the pressure gradient separates the isotope mixture gas in the radial direction. The separation effect of the isotope is reflected in the distribution of the component concentration field. It is solved by the component transport equation. In order to objectively describe the convection-diffusion law of components under high-speed rotating conditions 9 the component transport equation with pressure diffusion term is used to solve the concentration field. The numerical calculation of the high-speed rotating concentration field is realized. By comparing the theoretical solution under the isothermal rigid body condition with the numerical solution of the article, the feasibility and accuracy of the adopted solution method are verified. As the research progresses, the method of solving the component transport equation with pressure diffusion term will be applied to solving the separation performance of special equipment. (authors)

[en] Objective: To study the correlation of leptin between maternal serum and cord blood and to know relationship between leptin and fetal growth, and the origin of leptin. Methods: The concentration of leptin in 55 cases of maternal serum and cord arterial and venous blood were measured by ELISA assay. According to the neonatal weight and gestational age, three groups were divided into small gestational age (SGA), appropriate gestational age (AGA) and large gestational age (LGA). The nutrition status of neonatal was evaluated by index of Pondernal. The comparision was made in these groups. Results: The concentration of leptin in the cord artery, venous and maternal serum among 55 cases was 16.58 ± 8.13 ng/ml, 12.05 ± 9.87 ng/ml, 13.24 ± 10.58 ng/ml respectively; The concentration of maternal serum leptin was higher than that of cord artery. The concentration of maternal serum leptin was higher than that of venous serum leptin slightly. There was significant difference between cord artery and venous in different gestational age groups. Serum leptin levels of cord artery and venous were well correlated with the one of the weight and gestational age of neonatal. Maternal serum leptin level was not correlated with birth weight, placental weight and gestational age. Conclusions: The leptin from placenta is concerned with the adjustment of fetal growth. Cord leptin can reflect the status of fetal growth. Cord venous leptin indicate that the leptin be from placenta. Cord artery leptin demonstrates a part of placenta leptin, which acts on the fetus and then induces the fetal fat tissue to produce leptin. The maternal leptin does not adjust fetal weight directly. It only adjusts fat content itself and energy metabolism. (authors)

[en] In this study, the rare earth erbium oxide (Er₂O₃) was deposited using an electron beam onto an AlGaN/GaN heterostructure to fabricate metal-oxide-semiconductor high-electron-mobility transistors (MOS–HEMTs) that exhibited device performance superior to that of a conventional HEMT. Under similar bias conditions, the gate leakage currents of these MOS–HEMT devices were four orders of magnitude lower than those of conventional Schottky gate HEMTs. The measured sub-threshold swing (SS) and the effective trap state density (N_t) of the MOS–HEMT were 125 mV/decade and 4.3 × 10¹² cm⁻², respectively. The dielectric constant of the Er₂O₃ layer in this study was 14, as determined through capacitance–voltage measurements. In addition, the gate–source reverse breakdown voltage increased from –166 V for the conventional HEMT to –196 V for the Er₂O₃ MOS–HEMT. - Highlights: ► GaN/AlGaN/Er₂O₃ metal-oxide semiconductor high electron mobility transistor ► Physical and electrical characteristics are presented. ► Electron beam evaporated Er₂O₃ with excellent surface roughness ► Device exhibits reduced gate leakage current and improved I_ON/I_OFF ratio