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研究快速准确测定食用植物油中重金属元素的方法。采用微波消解对食用植物油样品进行预处理，在多模式进样系统（MSIS）的双重模式下，采用电感耦合等离子体发射光谱（ICP-OES）测定其中可形成蒸气重金属元素As、Sb、Hg和不可形成蒸气重金属元素Ni、Cd、Pb的含量。选择盐酸对样品进行酸化并还原氧化态元素，通过在线加入L-半胱氨酸/酒石酸提高可形成蒸气元素的蒸气发生效率，利用快速自动曲线拟合技术（FACT）消除光谱干扰。方法的检出限（LOD）为0.63~20.60 μg/kg，加标回收率为97.0%~104%，相对标准偏差（RSD）为1.5%~2.6%。该方法在分析可形成蒸气元素和不可形成蒸气元素时无需切换不同进样系统，能满足食用植物油中微量重金属元素的高通量分析需要。 A rapid and accurate method for the determination of heavy metals in edible vegetable oils was investigated. Edible vegetable oils were pretreated with microwave digestion. In the dual mode of multimode sample introduction system (MSIS), the contents of vapor forming heavy metal elements As, Sb and Hg and non-vapor forming heavy metal elements Ni, Cd and Pb were determined by inductively coupled plasma optical emission spectrometry (ICP-OES). Hydrochloric acid was selected to acidify the sample and reduce the oxidized elements in the sample. L-cysteine/tartaric acid was added online to improve the vapor generation efficiency. Fast automatic curve fitting technology (FACT) was used to eliminate spectral interference. The method detection limit (LOD) was 0.63-20.60 μg/kg, the recovery rate was 97.0%-104%, and the relative standard deviation (RSD) was 1.5%-2.6%. The method does not need to switch between different sampling systems when analyzing vapor forming elements and non-vapor forming elements, which can meet the needs of high throughput analysis of trace heavy metal elements in edible vegetable oils.

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This study aimed to explore the interrelationships among plant species, their ecological niches, and community stability by establishing and investigating long-term biodiversity monitoring plots. Understanding the succession patterns of these communities can provide a foundation for biodiversity conservation, forest resource management, and vegetation restoration in forest parks. A 1 hm² plot was selected within the broad-leaved forest in the Xin’anjiang Forest Park for dynamic monitoring. Based on their importance values, the study focused on the top 13 dominant woody species. Ecological niche widths (BS, BL) and niche overlap indices(Oik) were calculated. Statistical methods including variance ratio, Chi-square test χ2, Pearson’s coefficient of correlation, and Spearman’s rank-order correlation coefficient were used to analyze the relationship between species niche overlap indices and species associations. The study found no significant correlation between the ranking of importance values and niche breadths. Schima superba presented the highest importance value, followed by Quercus glauca, Castanopsis sclerophylla, and Lithocarpus glabra. These four species demonstrated a competitive edge in the community’ s resource dynamics, displaying a high degree of niche convergence among the dominant species. The collective linkage of the 13 dominant species demonstrated a marked positive correlation. The χ2 test results indicated strong relative independence among species, with only one species pair showing significant linkage, indicating loose connectivity. The Pearson correlation coefficient presented a significant level of 24. 4%, while the Spearman rank correlation coefficient showed that only 28. 2% of species pairs had significant linkage. The niche overlap index was positively correlated with species connectivity. In summary, the overall community was determined to be in a stable state and is currently progressing toward the mid-to-late stage of positive succession. It is recommended that appropriate thinning of denser stands, particularly of Castanopsis sclerophylla and Cunninghamia lanceolata, be conducted to promote the formation of a high-quality forest community while strictly protecting the current forest. [ABSTRACT FROM AUTHOR]

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To enhance the safety of railway tunnels with diseases in high seismic areas, a tunnel inspection vehicle was used to test 29 high-speed railway tunnel linings for voids behind them. The influence of voids on the safety of tunnel structures was studied using the finite difference method. The results indicate that voids behind the lining of high-speed railway tunnels are prone to occur at the arch crown, accounting for 80. 00% of occurrences. The most frequent range of longitudinal length for voids is from 2 m to 4 m, representing 46. 49% of occurrences. The minimum distance between voids and the lining surface is mainly distributed in the range of 0. 3 m to 0. 55 m, accounting for 78. 93%. Voids are often associated with defects in the thickness of the lining. Voids behind the lining alter the contact state between the surrounding rock and support, leading to changes in the inertial force and forced displacement of the structure. Displacement and stress states subsequently change. Voids result in changes in the internal forces of the structure in their respective locations, reducing the safety factor of the structure by 19. 51% to 95. 27%. As the void's circumferential angle, radial depth, and longitudinal length increase, the safety factor of the structure decreases. The cavity behind the lining will significantly reduce the seismic safety of high-speed railway tunnel lining. The research findings can provide a reference for seismic defense measures for high-speed railway tunnels with defects. [ABSTRACT FROM AUTHOR]

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To determine the reasonable stope structural parameters for the sublevel drilling stage open stope and subsequent filling mining method in Hongling Lead Zinc Mine, numerical simulation was employed to study 16 different scenarios with roof thicknesses of 3 m, 5 m, 7 m, and 10 m, and stope lengths of 20 m, 30 m, 40 m, and 60 m, respectively. The stress, displacement, and plastic zone distribution of each scenario with a roof thickness of 3 m were compared. The results indicate that the stability of the stope in Hongling Lead Zine Mine is fairly good when the roof thickness is 3 m and the stope length is 35 m for the sublevel drilling stage open stope and subsequent filling mining method. [ABSTRACT FROM AUTHOR]

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In order to study the effect of strain rate on the dynamic characteristics of phyllite under different length‑diameter ratio and dip angle, the samples with four dip angles (α=0°, 30°, 60° and 90°) and two lengths (L=25, 50 mm) were selected as research objects. The dynamic compression tests under different impact pressures (p=0. 150, 0. 175, 0. 200, 0. 225 and 0. 250 MPa) were carried out by using the split Hopkinson pressure bar (SHPB) system. The dynamic characteristics of phyllite with two aspect ratios at different strain rates were studied, and the influence of the coupling effect between the bedding dip angle, aspect ratio and strain rate on the strength characteristics of phyllite was analyzed. The results show that under dynamic compression, the dynamic compressive strength of phyllite with two different aspect ratios decreases first and then increases with the increase of bedding angle, and the dynamic peak strength and peak strain increase with the increase of strain rate. The relationship between dynamic compressive strength of phyllite and strain rate follows a power function. The relationship between peak strength and bedding angle α and L/D is binary function. When α=60°, the aspect ratio effect on the dynamic compressive strength of phyllite is the most significant, and when L/D=2, the dip angle effect is the most significant. Under different bedding dip angles, the aspect ratio effect of peak strain is the most significant at 0°dip angle, and the weakest at 90°dip angle. The strain rate effect on dynamic compressive strength and peak strain of phyllite under dynamic impact is stronger than that of aspect ratio effect. [ABSTRACT FROM AUTHOR]

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The Manned-Unmanned Teaming technology can fully leverage the low cost and expendable advantages of unmanned platforms to expand the operational space of manned platforms, thereby enhancing their situational awareness, penetration capability, and survivability. This paper provides a research overview on the development of MUM-T in the United States, Britain, France, Australia, South Korea, and other countries. It provides several application examples of MUM-T in foreign militaries on marine, land, and air space. It also analyzes some technical challenges and key technologies of MUM-T in wireless communication and networking, remote measurement and control, autonomous decision-making, and human-machine interaction. Finally, the future development trend of MUM-T is prospected, which can serve as a reference for the study of collaborative combat styles and related technological research in future joint operational systems. [ABSTRACT FROM AUTHOR]

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[Abstract] Morita therapy has been born for more than 100 years. Inpatient Morita therapy is highly operable and easy to master. It can improve many refractory neuroses through four-stage treatment. But more neuroses are treated in outpatient clinics, and Morita therapy cannot be used in hospitalized patients. Therefore, the formulation of expert opinions on outpatient operations is particularly important. This paper is based on domestic and foreign references, and after many discussions by domestic Morita therapy experts, and then drew up the first version of the expert opinions on operation of outpatient Morita therapy. Meanwhile the operation rule of Morita therapy in three stages of outpatient treatment was formulated: in the etiological analysis stage, under the theoretical guidance of Morita therapy, analyze the pathogenic factors, to improve treatment compliance and reduce resistance; during the operating stage, guide patients to engage in constructive and meaningful actions, realizing the achievement of letting nature take its course principle; in the cultivating character and enriching life stage, pay attention to positive information, expanding the scope and content of actions, improving the ability to adapt to complex life, and preventing recurrence caused by insufficient abilities. It will lay a foundation for the promotion of Morita therapy in domestic outpatient clinics, so that more patients with neurosis and other psychological diseases could receive characteristic Morita therapy treatment in outpatient clinics. [ABSTRACT FROM AUTHOR]

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