[en] Highlights: • Effect of volume fraction and length of basalt fibre on concrete properties is tested. • Adding basalt fibre is found to improve mechanical properties of concrete. • A good bond between basalt fibre and matrix interface is observed in the early age by SEM. • MIP analysis shows basalt fibre concrete presents higher porosity. - Abstract: With high ductility and sufficient durability, fibre reinforced concrete (FRC) is widely used. In this study, the effects of the volume fraction and length of basalt fibre (BF) on the mechanical properties of FRC were analyzed. Coupling with the scanning electron microscope (SEM) and mercury intrusion porosimeter (MIP), the microstructure of BF concrete was studied also. The results show that adding BF significantly improves the tensile strength, flexural strength and toughness index, whereas the compressive strength shows no obvious increase. Furthermore, the length of BF presents an influence on the mechanical properties. Compared with the plain concrete, the compressive, splitting tensile and flexural strength of concrete reinforced with 12 mm BF increase by −0.18–4.68%, 14.08–24.34% and 6.30–9.58% respectively. As the BF length increasing to 22 mm, corresponding strengths increase by 0.55–5.72%, 14.96–25.51% and 7.35–10.37%, separately. A good bond between the BF and the matrix interface is observed in the early age. However, this bond shows degradation to a certain extent at 28 days. Moreover, the MIP results indicate that the concrete containing BF presents higher porosity

[en] The relativistic mean field theory is applied to study the macroscopic properties of the neutron star. We investigate the effects of the σ-cut scheme when hyperons are included. In particular, we are interested in the question whether we can use the σ-cut scheme to solve the so-called "hyperon puzzle". Through careful choice of the parameter of the σ-cut scheme, we are able to produce a maximum mass neutron star heavier than 2.01 M${}_{sun}$. The role of the ρ-ω interaction, which modifies the density dependence of the symmetry energy, is also investigated. We find that the anomalous magnetic moments cause neutral fermions to be spin-polarized within this framework.

[en] Uranium bodies are found in the Yaojia formation in the southwest of Songliao basin, and the proved sandstone type uranium deposits such as Baolongshan and Qianjiadian are also concentrated in the sand bodies of Yaojia formation. Based on the study of the sedimentary characteristics of Yaojia formation in Baicheng area, it is concluded that the sedimentary characteristics have a restrictive effect on uranium mineralization. The sedimentary system of the Yaojia formation of the Upper Cretaceous is dominated by alluvial fan, braided river, delta and lake, forming a stable mud-sand-mud stratum structure. Controlled by the sedimentary system, the braided river sand body in this area has a stable thickness,wide distribution range, good permeability of sand body, and good stratification, which is easy to form the oxidation zone type uranium deposit between the layers. At present, regional interlayer oxidation zone has been found in Yaojia formation, and its meta genetic oxidation is mainly controlled by sedimentary facies zone. This paper studies the relation between sedimentary characteristics and uranium mineralization characteristics of Yaojia formation, analyzes its regularity, and predicts the uranium mineralization prospect area, providing a theoretical basis for future exploration of sandstone type uranium deposits. (authors)

[en] It is concluded that Baolongshan uranium deposit belongs to the complex genetic deposit of the superimposed transformation of homologous sediments, after studying the geological characteristics of Baolongshan uranium deposit. The mineral body is mostly plate-like, layered, and the production pattern is consistent with the formation, which is different from the typical inter-layer oxidation zone sandstone type uranium mineral. The mineral symbiosis combination shows that mineralization has many characteristics such as cogeneration deposit, oil and gas reduction superposition, and hydrothermal transformation. The formation of mineral deposits has undergone the initial pre-enrichment of uranium in sedimentary and diagenetic processes, infiltration and oxidation of oxygen-containing uranium water, and hydrothermal superposition and transformation. The mineral deposits are jointly controlled by structures, braided river sand bodies, inter-layer oxidation zones, and hydrothermal transformation. (authors)

[en] Objective: To study the diagnostic value of AccuBrain, an automated quantitative tool in assessing the brain structure changes in patients with mild cognitive impairment (MCI) and Alzheimer's disease (AD). Methods: 3D MRI of the whole brain was performed using a 3 T MR scanner (Siemens, Verio, Germany) on patients with AD (21) and MCI (24) as well as 24 age and sex matched healthy volunteers. The AccuBrain method was used to automatically segment more than 20 brain regions and measure their volume and volume ratio. Results: Compared with the control group, the absolute volume was significantly different in the bilateral hippocampus, cingulate gyrus, insula, temporal lobe, and ventricles of patients with MCI whereas significant different volume was found in the bilateral amygdala, putamen, hippocampus, nucleus accumbens, frontal lobe, temporal lobe, cingulate gyrus, insula, and ventricles of patients with AD. Significant difference in volume ratio was found in the left amygdala, left cingulate gyrus, bilateral hippocampus, ventral diencephalon, thalamus, frontal lobe, temporal lobe, insula, and ventricles of patients with MCI whereas the volume ratio was significantly different in the left cingulate gyrus, bilateral hippocampus, amygdala, ventral diencephalon, thalamus, putamen, nucleus accumbens, frontal lobe, temporal lobe, insula, and ventricles of patients with AD. Conclusion: AccuBrain can automatically segment the whole brain and quantify the volume. It may be useful in the early clinical diagnosis of AD. (authors)

[en] Qianjiadian area is located in the southwest of Songliao Basin, in the Songliao Basin metallogenic area-Kailu uranium producing depression. Sandstone-type uranium deposit has a great prospecting prospect. Based on the analysis of the trinity characteristics of uranium mineralization, such as identification of single sand body, the Redox transition zone of the metallogenic structure surface and the metallogenic characteristic interlayer metallogenic mineralization, three pieces of metallogenic prospective are predicted in the study area. It points out the direction of uranium prospecting in the area. (authors)

[en] Chronic inflammatory demyelinating polyradiculoneuropathy (CIDP) is a serious, immune-mediated neuropathy with a wide range of involvements, complicated courses and various clinical presentations. Magnetic resonance neurography (MRN) has a unique advantage in the diagnosis of CIDP. It can be used to visualize lesions of the peripheral nervous system directly and evaluate the lesions functionally. Currently, the researches have been focusing on two types of imaging techniques. One is based on the T₂-weighted fat suppressed imaging technique, and the other is based on the diffusion MR technique. The research progress of MRI in CIDP was reviewed in this paper. (authors)

[en] Highlights: • 3Cr steel suffered severe localized corrosion in CO_2–O_2 environment. • Fe(OH)_3 in CO_2–O_2 corrosion scale of 3Cr steel caused Cr nonuniform distribution. • A development mechanism of CO_2–O_2 corrosion pits of 3Cr steel was proposed. - Abstract: The development of corrosion scale of 3Cr steel in an aqueous environment containing 95% CO_2–5% O_2 was characterized and analyzed by scanning electron microscopy (SEM), energy-dispersive spectrometry (EDS), X-ray diffraction (XRD) and in situ electrochemical impedance spectroscopy (EIS). The results show that the corrosion of 3Cr steel was promoted by dissolved oxygen. Fe(OH)_3 precipitation formed at local areas, leading to the nonuniform distribution of Cr element and pitting corrosion. With the increase of corrosion time, Cr-rich area formed at the bottom of pits, where the pitting corrosion process was inhibited. The importance of Fe(OH)_3 and Cr-rich area on the formation of corrosion pits and pits development was emphasized

[en] Songliao Basin is a large Mesozoic-Cenozoic energy basin in Northeast China. The study area is located in the transition zone between Kailu Depression and Southwest Uplift in the southwestern part of the basin. By analyzing and sorting out geochemical elements and trace uranium samples, it is found that contents of C_organic, C0₂, S_all and Fe²⁺ elements in the strata of Yaojia Formation increase gradually from oxidation zone, reduction zone to oxidation-reduction zone, while the content of Fe³⁺ is the opposite. On the plane, the contents of Fe²⁺, C_organiC, C0₂ and S_all increase from the provenance to the denudation window areas, whereas the content of Fe³⁺ is the opposite. According to the known characteristics of uranium mineralization, it is known that uranium element has obvious linear relationship with elements such as Fe²⁺, C_organic, C0₂, S_all and Fe³⁺. The correlation between geochemical elements and uranium elements is summarized to provide prospecting direction for uranium ore prospecting in the future. (authors)

[en] The energy levels of spectrum, wavefunctions and crystal-field parameters of MgAl₂O₄:Cr³⁺ at normal pressure have been calculated by the means of diagonalizing the complete d³energy matrix (DCEM). With these results, the g factor of the ground state at normal pressure and the pressure-induced shift (PS) of the spectral levels are also calculated uniformly, and the calculated results are all in good agreement with the experimental ones. And the contributions of various crystal-field parameters to the energy levels at normal pressure and the variational rates of the R₁ line shifting with the pressure are calculated, from which the physical origin of the red shift of the R₁ line shifting with increasing pressure have been clearly shown