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为研究部分包覆钢-混凝土组合（steel-concrete partially encased composite，PEC）构件火灾下的传热性能，首先采用PEC构件标准火灾试验验证了二维有限元模型，然后对火灾下带有防火保护的PEC构件的升温过程及主要影响参数进行研究分析。研究表明，不同防火保护条件下，PEC构件H型钢腹板最高点温度均位于翼缘与腹板交点处，PEC构件截面温度最高点位置均位于翼缘端部。H型钢截面形状系数、翼缘厚度、腹板厚度以及H型钢高度、宽度等参数对PEC构件升温均有影响，其中影响较大的是翼缘厚度与H型钢宽度。通过将H型钢标准规格截面进行分组模拟，计算PEC构件在标准升温条件下所需防火层厚度，给出不同防火保护措施及不同耐火极限下，PEC构件防火层建议厚度设计值。

目的肝糖原贮积病（GSD）患者有反复的低血糖发作。本研究的目的是调查分析儿童肝糖原贮积病（GSD）日常血糖及生化指标，为预防低血糖发作和临床管理提供数据支持。方法横断面现场调查研究，收集2024年7月14日在广东省人民医院儿科进行医患交流义诊活动的肝GSD患者及家长的临床资料，现场采集患者及家庭对照者的外周血，检测和分析两组间血糖及生化指标的差异。结果44例肝GSD患者中男34例，女10例。亚型包括GSD Ib型14例、Ia型15例，Ⅲ型2例，Ⅵ型7例，Ⅸ型6例。年龄为7.60（5.08~11.98）岁，所有患者均依赖生玉米淀粉维持血糖。肝GSD患者中平素肝大和反复低血糖发作的患病率分别为77.3%（34/44）和61.4%（27/44）。此次检测有61.4%（27/44）的患者血糖 ≤ 3.9 mmol/L，其中18.2%（8/44）的患者血糖 ≤ 2.8 mmol/L，且均为非Ib型患者，血糖最低值为1.19 mmol/L，医患交流活动期间所有患者均未出现低血糖的症状发作。65.9%（29/44）的家庭受检者的血糖 ≤ 3.9 mmol/L，与肝GSD组比较，低血糖的患病率差异无统计学意义（P =0.658）。生化检测中，肝GSD患者高乳酸血症、高尿酸血症和高胆固醇血症的患病率分别为65.9%、45.5%和9.1%，而家庭对照受检者分别为18.2%，43.2%，15.9%，两组的高尿酸血症和高胆固醇血症患病率差异无统计学意义（P=0.830， P=0.334）。结论肝GSD患者的无症状性低血糖较为普遍，特别是非Ib型患者，需要优化生玉米淀粉的饮食管理，进行动态血糖监测，并注意家庭清淡饮食，降低高尿酸血症和高胆固醇血症发生，避免严重低血糖状态带来的严重不良反应风险、降低并发症。

目的罕见的原发性腰椎间隙感染肺炎克雷伯菌合并阴沟肠杆菌的临床诊疗初探，为此类罕见脊柱感染诊疗提供临床经验。方法腰痛伴左下肢麻痛7月余、加重1周余的老年男性患者，经实验室、影像学检查，诊断为腰椎间盘突出症，入院后症状急性加重，复查腰椎增强MRI示L3/4椎间隙后部局部强化信号，VAS评分9分，腰部JOA评分6分。实施腰椎后路L3/4、L4/5椎间盘摘除＋cage植骨融合＋L3-L5椎弓根钉棒内固定术，并留取术中L3/4椎间盘标本备细菌培养。结果细菌培养结果回示肺炎克雷伯杆菌及阴沟肠杆菌感染，术后敏感抗生素治疗6周，患者在术后半年的随访中获得痊愈。结论对临床表现为急性剧烈腰痛或下肢疼痛的中老年患者，在常规实验室、影像学检查提示腰椎退行性疾病的同时应考虑脊柱感染可能。

信息技术的发展推动了科学研究范式的转变。近年来，社科人文领域也逐渐发展出了数据驱动的研究方式。从可视化的角度，对国际数字人文大会论文进行分析，从任务、数据和应用视角3个层面总结了当前可视化在数字人文中的应用现状。通过分析从人文、可视化技术、艺术3种角度出发的数字人文项目，揭示了多学科交叉对提高数字人文与可视化结合项目质量的巨大潜力。同时，分享了北京大学在探究这种多学科交叉合作新范式的实践，包括交叉人才的教育、学科交叉融合的科普以及相关智能可视化技术的研究等方面。最后讨论了通过探索更好的人与人之间合作及人与计算机之间的协作来促进数字人文与可视化学科交叉发展的展望。

为精确分析剪切型软钢阻尼器大塑性变形过程中生热对其耗能性能的影响，通过高温箱对软钢试件进行加热，在几种不同温度（25 ℃、100 ℃ 和 300 ℃）下进行单向扭转和往复扭转试验，研究温度对软钢力学性能和本构关系的影响。结果表明：高温会引起软钢的应力软化，但变形能力不受影响。温度对软钢往复加载起始的循环硬化和往复加载过程中的循环软化及其变化规律都没有影响。所建立的考虑温度效应的软钢本构模型可为科学评估软钢阻尼器的动态力学性能提供依据。

为了提升可见光通信（VLC）定位系统的频谱和功率利用率,文章提出了一种基于非对称限幅和直流偏置的光正交频分复用（ADO-OFDM）的VLC定位集成系统。该通信定位集成系统具有比基于非对称限幅的光正交频分复用（ACO-OFDM）的VLC定位集成系统更高的频谱利用率和比基于加直流偏置的光正交频分复用（DCO-OFDM）的VLC定位集成系统更高的功率利用率。同时,文章还提出了一种差分修正定位算法,所提算法较于传统的三边定位算法其具有更高的定位精度。

目的 探讨青年卒中后认知障碍（post-stroke cognitive impairment，PSCI）的危险因素。 方法 连续收集2016年12月-2017年12月在天津市环湖医院神经内科住院的18～45岁的缺血性卒中 患者165例，记录患者人口学资料、血管危险因素、实验室检查资料，所有患者于发病14 d内行蒙特利 尔认知评估量表（Montreal cognitive assessment scale，MoCA）测评，根据MoCA评分

研究了基于DWT（小波变换）的OFDM（正交频分复用）和FFT（快速傅里叶变换）的OFDM两种不同调制方式在PLC（电力线通信）系统中的性能。首先建立了两种不同调制方式下PLC的系统模型,然后在AWGN（加性高斯白噪声）和子CFO（载波频率偏移）的干扰下,分析了两种系统的误码性能以及峰均功率比的分布。通过仿真发现,在PLC系统中,DWT-OFDM系统比FFT-OFDM系统更具优势,在未来的PLC系统中必将发挥重要的作用。

针对可见光通信系统调制带宽有限的问题,提出了将两种具有高频带利用率的调制方式应用于可见光通信系统的方案。分别论述了正交频分复用和奈奎斯特单载波调制的基本原理和产生途径,仿真验证了正交频分复用和奈奎斯特单载波两种调制解调技术应用于可见光通信系统时的性能,比较分析了两种技术在不同信噪比条件下的误码率和频带利用率,仿真结果表明,奈奎斯特单载波相对于正交频分复用有更高的频带利用率和较低的误码率,更适用于可见光通信系统。

针对发光二极管之间的多径干扰,提出了采用QR分解的信道均衡算法消除干扰的方案。首先建立基于离散傅里叶变换扩频的正交频分复用技术的电力线与可见光融合通信系统,并考虑了由两个发光二极管之间的电线差所引发的多径干扰,然后比较了该系统下采用QR分解的信道均衡算法和传统信道均衡算法下的误码性能。结果表明,采用QR分解的信道均衡算法可消除由发光二极管之间的电线差引起的多径干扰,从而提高系统的传输性能。

文章提出一种新型低损耗太赫兹波塑料光子晶体光纤（THz-PPCF）结构,其包层是由两种直径不同的空气孔周期性排列而成。利用时域有限差分法（FDTD）对其色散特性进行了分析。结果表明,通过调节包层中两种空气孔的直径以及晶格常数,可以得到低损耗、超平坦趋于零色散的太赫兹波塑料光子晶体光纤。

利用RSoft软件对包层空气孔为正六边形对称结构的光子晶体光纤的模场进行了分析,并使用模式耦合理论和传输矩阵法对光子晶体光纤光栅（PCFG）特性进行了计算和仿真,对比了不同包层结构和纤芯尺寸的PCFG反射谱之间的差异。仿真结果显示,占空比和纤芯尺寸的大小可影响谐振峰的数量和谐振波长值的大小。

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Soil fungi play important roles in nutrient cycling and energy flow in forest ecosystems. To investigate the impact of altitude on soil physicochemical properties and enzyme activity and to reveal the altitudinal distribution pattern of soil fungal communities, this study focused on surface soil at different altitudes (2 400, 2 500, 2 600, 2 700, 2800 m) in the Beishan Forest Farm, Qinghai Province. High-throughput sequencing technology was used to analyze the diversity and richness of fungal communities and explore the main factors influencing the soil fungal community structure. Fifteen phyla, 59 classes, 144 orders, 302 families, and 633 genera of soil fungi were discovered across the five altitudes. At the phylum level, the dominant fungal communities were Ascomycota, Basidiomycota, and Mortierellomycota. The richness index (Ace, Chao index) and diversity index (Shannon index) of soil fungal communities generally increase with altitude. The soil organic carbon content, moisture content, andα-glucosidase activity increase with altitude. The urease activity first decreases, then increases, and then decreases with altitude. Redundancy analysis showed that soil physicochemical properties and enzyme activity jointly explained 81. 23% of fungal community variation, and soil nitrate nitrogen content, total phosphorus content, and pH value were the main influencing factors of soil fungal community richness differences. [ABSTRACT FROM AUTHOR]

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In order to preliminarily evaluate the early growth of Pinus koraiensis and select excellent families, taking 117 full-sib family seedlings obtained by controlled pollination in the Affinity Seed Garden of Wangqing Forestry Branch of Changbaishan Forest Industry Group as materials, we observed their growth for three consecutive years and conducted a comprehensive evaluation after establishing a progeny measurement forest in the Affinity Seed Garden in the 91st forest class, class 4. The differences in seedling height and ground diameter of the offspring of P. koraiensis full-sib family lines from 6 to 8 years old were highly significant among family lines, and the interaction between family lines and district groups was highly significant (P<0. 01); the average seedling height at 6 years old was 39. 79 cm, the average annual growth rate at 8 years old was 25%, the average ground diameter at 6 years old was 11.11 mm, the average annual growth rate at 8 years old was 34%, and the phenotypic coefficient of variation of each trait ranged from 15. 84% to 25. 43%. The heritability of each trait was high, which was conducive to the further selection and evaluation of the family line. Using the Breggin multiple trait analysis method to select superior family lines, 24 superior family lines were from 117 familes with a benchmark of 20%. The excellent family lines selected by growth traits can provide the basis and materials for renewing the seed orchard generation and promoting the superiority and expansion of P. koraiensis. [ABSTRACT FROM AUTHOR]

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Biliary atresia, as the main component of bile, have physiological functions such as digesting lipids, regulating gut microbiota, and controlling metabolism. Children with biliary atresia often experience varying degrees of bile acid metabolism disorders. Bile acids are amphiphilic molecules, with hydrophobic bile acids generally exhibiting higher cytotoxicity. In the pathological state of biliary atresia, the inherent cytotoxicity of bile acid is amplified, contributing to a series of pathological changes. Conversely, hydrophilic bile acids, such as ursodeoxycholic acid, can significantly improve liver function, a characteristic currently used in the treatment of biliary atresia. Serum bile acid levels increase with the severity of liver fibrosis, which can be useful for assessing the extent of liver damage. This article reviews the relationship between the toxic effects of bile acids and the pathophysiological changes in biliary atresia, and briefly introduces current diagnostic and therapeutic approaches related to bile acids in the management of biliary atresia, providing references for clinical and research work. [ABSTRACT FROM AUTHOR]

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Copyright of Journal of Agro-Environment Science is the property of Journal of Agro-Environment Science Editorial Board 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 Science Technology & Engineering is the property of Chinese Society of Technology Economics 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.)

To study the chemical constituents of n-butanol extract from Astragalus rigidulus, HP-20 macroporous adsorption resin, Sephadex LH-20 gel, ODS gel column chromatography and semi-preparative high performance liquid chromatography were used to separate the chemical constituents. The structures of all isolates were identified by spectroscopic methods, including NMR and HR-ESI-MS. The results showed that twenty compounds including nineteen flavonoid derivatives and one sesquiterpene glycoside were isolated and purified from n-butanol extract of A. rigidulus. Their structures were identified as 7-O-methylorobol-4'-O-β-D-glucopyranoside(1), mildiside A(2), naringenin(3), purine 4'-O-β-D-glucoside(4), orobot(5), kaempferol-3-O-β-D-(6'-acetyl)glucopyranoside(6), 5,7-dihydroxy-4'-methoxyisoflavone-2'-O-β-D-glucopyranoside(7), amarantholidoside IV(8), kaempferol-3-O-α-L-rhamnopyranosyl-(1→2)-β-D-glucopyranoside(9), kaempferol(10), 5,7,4'-trihydroxyisoflavone(11), kaempferol-3-O-β-D-glucopyranoside(12),(S)-mucronulatol(13), calycosin(14), quercetin(15), pratensein-7-O-β-D-glucoside(16), 2'-hydroxy-3',4'-dimethoxyisoflavan-7-O-β-D-glucoside(17), kaempferol-3-O-rutinoside(18), 5,7,4'-trihydroxy-3'-methoxyflavonol-3-O-rutinoside(19), quercetin-3-O-β-D-glucoside(20). It is the first report for the compounds 1-9 found in the genus Astragalus. The other compounds are isolated from the title plant for the first time. The results of this study provide basic data for the pharmacodynamic material study of A. rigidulus, and provide a theoretical reference for the rational development and utilization of the plant resources in the future. [ABSTRACT FROM AUTHOR]

Wheeled mobile robots are prone to wheel slippage on soft and complex terrains, which affects trajectory tracking accuracy. To improve the trajectory tracking accuracy of robots under such conditions, an adaptive slip compensation controller (ASCC) based on fault‑tolerant control (FTC) is proposed. Firstly, a kinematic model of a four‑wheeled mobile robot (4 WMR) is established by considering wheel slippage rates, and the corresponding trajectory tracking error model is constructed. Then, based on the FTC method, a slippage compensation term is designed. The stability of the ASCC is proven using Lyapunov stability theory, achieving accurate compensation for the velocity error caused by wheel slippage. Finally, experiments under two working conditions are conducted on the 4 WMR. The results show that the designed controller enables the mobile robot to track the desired path under unknown wheel slippage rates, and it exhibits stronger robustness and higher tracking accuracy compared to the conventional controllers. [ABSTRACT FROM AUTHOR]

[Objective] The study aimed to explore the relationship between weed diversity and soil factors in kiwifruit orchards under artificial disturbance, providing reference for formulating the accurate ecological weed control measures and ensuring the green production in orchards. [Method] The control and disturbed plots were set up. The a-species diversity indices and soil chemical indicators of these plot communities were measured, and the methods of redundancy analysis, canonical correspondence analysis and regression analysis were used to examine the effect of 'herbicide + manual weed control' disturbance on the coupling relationship between weed species diversity and soil factors. [Result] (i) The 25 weed species belonging to 15 families and 24 genera were recorded from five control plots, while 19 weed species belonging to 14 families and 18 genera were recorded from five disturbed plots, and the Asteraceae and Poaceae had the higher species richness. There was no significant difference in the four diversity indices between control and disturbed plots, however, the dominant weed changed from the native species Echinochloa crusgalli to the invasive species Alternanthera philoxeroides under disturbance. (ii) The redundancy analysis showed that the diversity indices had a negative relationship with soil pH, and disturbance further enhanced the determinant of pH on weed diversity. In disturbed plots, soil available phosphorus had a significant binomial fitting relationship with Simpson dominance index (R2 =0. 957, P=0.042) and Pielou evenness index (R2 =0.989, P=0.010), which all showed the convex trend. (iii) The canonical correspondence analysis showed that disturbance exacerbated the patchy aggregation distributions of weeds, and caused the determinants of weed distributions changing from soil pH and available potassium to available phosphorus and nitrate nitrogen, and led to an avoidance behavior of many weed species to the increasing nitrate nitrogen. In the canonical correspondence analysis diagram, the Digitaria sanguinalis and Solanum nigrum were all close to A. philoxeroides. [Conclusion] Maintaining a higher pH and available phosphorus content through soil improvement, planting native plants with strong resistance to prevent A. philoxeroides invasion through orchard grasses cultivation, and timely eradicating the nitrate nitrogen-preferred weeds are all beneficial for improving the quality and efficiency of weed control in kiwifruit orchards. [ABSTRACT FROM AUTHOR]

Copyright of Traditional Chinese Drug Research & Clinical Pharmacology is the property of Traditional Chinese Drug Research & Clinical Pharmacology 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.)

Copyright of Journal of Nanchang University (Natural Science) is the property of Journal of Nanchang University (Natural Science) 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.)

Copyright of Biotechnology Bulletin is the property of Biotechnology Bulletin 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.)