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针对类级别的物体姿态估计问题，提出一种仅将深度相机扫描的点云作为输入，在仅知道目标物体点云类别的情况下，准确估计目标物体三维位姿的方法。该方法不需要依赖大量的带标签的人工标注数据集，仅使用虚拟仿真技术模拟生产的数据，即可在真实数据集上取得较高的精度。该方法首先对输入点云进行背景噪声过滤，之后通过中心预测模块对点云做标准归一化，再使用基于对应类别模板点云变形的方法预测其标准坐标系坐标，最后通过最小二乘法获得目标物体的三维位姿。实验结果表明，该方法在真实数据上具有更好的泛化性能和更高的精度。

Copyright of Journal of Central South University of Forestry & Technology is the property of Editorial Office of Journal of Central South University of Forestry & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Materials Science & Engineering (1673-2812) is the property of Journal of Materials Science & Engineering Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Using FNL reanalysis data, high-altitude and ground observation data and rainfall data of regional meteorological stations, the ex- treme "Dragon Boat Water" sustained rainstorm process in Liuzhou on June 16-22, 2022 was analyzed, statistical analysis and other methods were used to study the characteristics of the continuous rainstorm process, and synoptic diagnostic analysis and other methods were used to study the mechanism of the continuous rainstorm. The results showed that the continuous rainstorm process was extremely extreme, of which the maxi- mum precipitation in 3,6 and 12 h had exceeded the historical extreme value since the meteorological records in Liuzhou City, and the maxi- mum precipitation in 1 and 24 h was the second in history, and the night rain was obvious, with the characteristics of rainstorm in warm regions. The 500 hPa short wave trough was an important dynamic forcing system in the upper layer of the continuous rainstorm. The short wave trough period was about 24 hours. The basic rule was that the influence at night and the movement out in the day lead to the characteristics of strong precipitation at night and weak precipitation at day in Liuzhou. The strong 850 hPa southwest airflow provided continuous water vapor transporta- tion for rainstorm, and the long maintained deep wet layer provided better humidity conditions for continuous rainstorm and extreme rainstorm. At the same time, the 850 hPa southwest jet weakened in the daytime and strengthened at night, which created better low-level dynamic condi- tions for the convergence and rise of airflow, and was an important trigger mechanism for rainstorm in warm regions. The 24-hour periodic varia- tion of 500 hPa short wave trough and the time fluctuation of 850 hPa southwest jet during the night and the day revealed by this study were im- portant trigger and maintenance mechanisms for the persistence of rainstorm in Liuzhou and the characteristics of night rain, providing a better theoretical support for the prediction of sustained rainstorm in the future. [ABSTRACT FROM AUTHOR]

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理解數學推導是困難的，而文獻上對文本中數學推導段落採用算式或文字表徵何者較具優勢的結論不一。本研究以299位來自四所高中職的高一學生為對象，比較科普文章以算式或文字表達數學推導對理解的影響，以及對高、低能力學生是否有不同的效果。由於高中生能力是巢套於學校，因此以共變數分析與階層線性模式來比較結果。研究材料為三篇幾何的科普文本及其理解測驗，算式與文字兩個版本的內容只在關鍵句（分別僅1、5、5句）用了不同表徵，其餘內容、附圖及測驗都相同。受試者被隨機分派到算式版或文字版，閱讀後的理解測驗包含是非、計算及說明題。此外，受試者也接受閱讀推理篩選測驗與數學先備知識測驗。共變數分析結果顯示能力和版本不具交互作用，且高能力學生顯著優於低能力學生，算式版多數優於文字版。而階層線性模式分析在排除學校平均數學能力的顯著影響後，凸顯了版本的效果，算式版低能力學生的閱讀表現與文字版高能力學生無顯著差異。本研究從算式和文 字的語言結構討論算式優勢，也透過文本主題領域、認知負荷、評量重點及測驗題型，和受試者特性與文獻進行比較。 Understanding mathematical reasoning is challenging. No conclusive evidence exists on which external representation is more beneficial to comprehension: equation or words. This study involved 299 high school students and examined the effects of external representations and participants’ abilities on reading comprehension of popular mathematics. Because students were nested within schools, analysis of covariance (ANCOVA) and hierarchical linear modeling (HLM) were performed, and their results were compared. The materials included three popular mathematics and comprehension tests, all of which were in the domain of geometry. The main difference between the equation version and the verbal version was the method of representation used in key sentences (only one, five, and five sentences differed in each of the three passages, respectively). The other sentences, illustrations, and tests were the same in both versions. Students were randomly assigned into groups for each of the two versions and completed the reading comprehension tests, reading comprehension screening tests, and math prior knowledge tests. The ANCOVA results demonstrated that the equation readers outperformed the verbal readers and that the high-ability readers performed better than the low-ability ones, but the results did not indicate any interaction between version and ability. After the exclusion of the effects of school-average math ability, the HLM results found that low-ability equation readers demonstrated a nonsignificant difference in performance compared with high-ability verbal readers. The benefits of using equations were discussed by comparing the linguistic features of the two external representations. Furthermore, the results were compared with previous research in terms of passage domain, cognitive load, focus of measurement, and participant characteristics.

Traditional particle swarm optimization(PSO) is prone to getting stuck in local optima and low search ability for energy consumption optimal solutions when planning plant protection operation paths. The study focuses on improving the PSO algorithm in order to improve the efficiency of crop protection drone operations and reduce drone losses. The study proposes an adjacent competition (AC) algorithm for crop protection operation path planning based on a crop protection UAV model in order to solve the problem of poor effectiveness of traditional particle swarm optimization algorithms applied to UAV plant protection operations. The adjacent competition algorithm ensures that the total distance of crop protection UAV operations is constant, provides prior knowledge of the search direction, and ensures that special points are not missed, preventing the algorithm from getting stuck in local optimal solutions: Firstly, all particles initialize the homework distance range to prevent extreme situations where the single homework distance is too long or too short. Secondly, each drone is randomly assigned the operating distance for each particle within the operating range. Finally, adjacent particles compete with each other for the operating distance, indirectly changing the operating distance of each flight and searching for the optimal path. The study used Matlab to conduct algorithm simulation verification on a simulated plant protection site of 420 m×200 m. Traditional particle swarm optimization algorithm often gets stuck in local optima and the final planning results fluctuate greatly, while the adjacent competition algorithm obtains the optimal energy consumption solution 9 times out of 10 planning iterations, and the planning energy consumption of non-optimal solutions is similar to the optimal energy consumption, still better than all planning results of the traditional particle swarm algorithm, proving that the neighboring contention algorithm has stronger searchability. The results show that traditional particle swarm optimization algorithms often got stuck in local optima and increased energy consumption by 16.16% to 38.14% compared to neighboring contention algorithms in 10 rounds of path planning. This indicated that the energy consumption of the adjacent competition algorithm proposed in this study for planning results is much lower than that of the traditional particle swarm optimization algorithm, and the algorithm has stronger search capabilities. This study used the RflySim simulation platform to build a crop protection drone model and a 420 m×200 m work site in order to compare the simulated tracking results of the traditional particle swarm optimization algorithm and adjacent competition algorithm in a virtual environment. The results show that the energy consumption of adjacent competition algorithm planning results is reduced by 25.15% compared to the traditional particle swarm algorithm. This study conducted actual flight tests using the drone M300 at a 420 m×200 m work site to validate the practicality of the algorithm. Actual flight experiments have shown that the energy consumption of adjacent contention algorithm planning results is reduced by 34.48% compared to traditional particle swarm optimization algorithms, making it more suitable for multiple crop protection operations. In actual experiments, the return points of multiple UAVs in the adjacent contention algorithm are closer to the supply point, the distance of departure and return is shorter, and the ineffective energy consumption is lower compared with the traditional particle swarm optimization algorithm, indicating that its planning is more reasonable. Adjacent particles indirectly change the distance of each operation by competing for each other's operation distance, effectively improving the convergence speed of the algorithm, preventing the algorithm from getting stuck in local optima, and improving the efficiency of multiple crop protection operations with a single drone. [ABSTRACT FROM AUTHOR]

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Objective: To investigate the correlation between peripheral blood microRNA (miRNA)-122a and miR-146a levels and T helper cells (Th)1/Th2/Th17 immune balance in children with atopic dermatitis (AD). Methods: 100 children with AD who were admitted to the Dermatology Department of Shijiazhuang Maternal and Child Health Hospital from May 2020 to May 2023 were selected as AD group. According to scoring atopic dermatitis (SCORAD), they were divided into mild group with 31 cases, moderate group with 41 cases and severe group with 28 cases. Another 100 healthy children during the same period were selected as control group. Real-time fluorescence quantitative polymerase chain reaction was used to detect the levels of peripheral blood miR-122a and miR-146a, and flow cytometry was used to detect the proportion of peripheral blood Th1, Th2 and Th17 cells. The levels of peripheral blood Th1, Th2 and Th17-related cytokines [interleukin (IL) -2, interferon-γ (IFN-γ), IL-4, IL-13, IL-17, IL-22] were detected by enzyme-linked immunosorbent assay, and the ratio of Th1/Th2/Th17 was calculated. The correlations of peripheral blood miR-122a, miR-146a and Th1, Th2, Th17 and related cytokines and Th1/Th2/Th17 of children with AD were analyzed by Pearson/Spearman correlation analysis. Results: The levels of peripheral blood miR-122a, miR-146a, Th1, Th1/Th2/Th17, IL-2 and IFN-γ of the AD group were lower than those of the control group, and the levels of Th2, Th17, IL-4, IL-13, IL-17 and IL-22 were higher than those of the control group (all P<0.05). The levels of peripheral blood miR-122a, miR-146a, Th1, Th1/Th2/Th17, IL-2 and IFN-γ of the mild group, moderate group and severe group were decreased successively, while the levels of Th2, Th17, IL-4, IL-13, IL-17 and IL-22 were increased successively (all P<0.05). Pearson/Spearman correlation analysis showed that peripheral blood miR-122a and miR-146a in children with AD were positively correlated with the levels of Th1, Th1/Th2/Th17, IL-2, and IFN-γ (r/rs were 0.679, 0.677, 0.684, 0.706, 0.693, 0.689, 0.671, 0.694, respectively, all P＜0.001), and negatively correlated with Th2, Th17, IL-4, IL-13, IL-17, IL-22 (r/rs were -0.690, -0.680, -0.681, -0.669, -0.675, -0.676, -0.676, -0.686, -0.682, -0.674, -0.680, -0.689, respectively, all P＜0.001). Conclusion: The decreased levels of peripheral blood miR-122a and miR-146a of patients with AD are closely related to the severity of the disease, and which may participate in the occurrence and development of AD by regulating the Th1/Th2/Th17 immune balance. [ABSTRACT FROM AUTHOR]

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报道2例在山东中医药大学第二附属医院内分泌科门诊就诊的2型糖尿病（T2DM）患者 的诊治过程, 患者就诊时的降糖治疗方案均为口服二甲双胍50 mg（3 次/d）联合达格列净10 mg （1次/d）。例1为56岁男性, 主因发现血糖升高18年, 加重伴乏力1个月就诊。患者18年前诊断为 T2DM, 有糖尿病周围神经病变病史4 年。体态偏胖, 体重指数（BMI）26.8 kg/m2。空腹血糖 13.81 mmol/L, 餐后2 h 血糖20.03 mmol/L;糖化血红蛋白（HbA1c）9.9%;空腹胰岛素32.53 mU/L。例 2为54岁男性, 因发现口干、多饮、多食15年, 双下肢无力2个月就诊。患者15年前诊断为T2DM, 既 往有高血压、脑梗死病史。患者BMI 25.7 kg/m2。空腹血糖13.81 mmol/L, 餐后2 h血糖20.03 mmol/L; HbA1c 9.7%;空腹胰岛素2.37 mU/L, 空腹C肽0.77 ng/ml。调整2例患者的治疗方案为继续口服二甲 双胍50 mg（3次/d）, 改达格列净为德谷胰岛素利拉鲁肽注射液10或12剂量单位（1次/d）治疗。2个月 后复诊, 患者均无胃肠道不良反应及低血糖。HbA1c分别降至7.3%和6.8%, BMI较前减低. [ABSTRACT FROM AUTHOR]

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179摩天轮高179m,轮缘直径170m,建成后将成为世界最高的摩天轮。179摩天轮采用刚性轮辐(刚性桁架硬支臂)与钢索混合结构形式。大型摩天轮的安装方案与摩天轮的结构设计密切相关,因此,在结构设计阶段就必须制订合理的安装方案。179摩天轮采用立面旋转安装法安装,并对8个施工步独立静止状态进行有限元分析。借助有限元软件ANSYS来模拟分析计算硬支臂和轮缘安装后不同安装位置静止情况下的等效应力、挠度、结构屈曲,由计算结果可知,不同安装位置摩天轮的结构安全可靠。

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