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为了促进全生命周期可拆卸钢结构和钢-混凝土组合结构的发展，完善相关受力性能评价方法和结构设计方法，针对新型可拆卸钢-混凝土组合梁抗剪连接件的受力机理和力学性能进行了试验研究。试件设计考虑不同的连接件（螺栓）直径（M20、M24）和材料强度（C50、C60混凝土），通过标准推出试验，分析了破坏模式、荷载-滑移响应、滑移和峰值荷载以及可拆卸性能等。通过将试验结果与中国、欧洲以及美国相关规范中针对组合梁栓钉抗剪连接件和螺栓紧固件抗剪承载力的计算方法进行对比分析，提出了该类新型抗剪连接件的摩擦型抗剪承载力和承压型抗剪承载力计算方法；基于受力机理分析，提出了该类可拆卸组合梁抗剪连接件的力学本构模型，并给出各个参数的确定方法。结果表明，提出的特征承载力和抗剪-滑移本构模型能够很好地描述该类抗剪连接件的力学性能，为在可拆卸钢-混凝土组合梁中的应用提供了理论和技术基础。

结合材性试验获得的不锈钢母材和焊缝金属材料本构关系模型,使用ANSYS有限元软件对奥氏体型S30408不锈钢角焊缝连接的承载性能进行了非线性有限元模拟,并将模拟结果与不锈钢正面角焊缝连接试件和侧面角焊缝连接试件拉伸试验结果进行了对比,验证了有限元模型的有效性。利用经试验验证的有限元模型对角焊缝承载力影响因素进行了参数分析,并将有限元模拟值与按照美国规范SEI/ASCE 8-02、欧洲规范EN 1993-1-4,以及中国《不锈钢结构技术规程》(CECS 410:2015)计算求得的规范设计值进行了对比,得出了承载力模拟值与各国规范设计值的比值,结果可为不锈钢设计规范的完善和工程应用提供参考。

针对单肢C形和U形截面及由其拼合而成的双肢和四肢截面冷弯薄壁型钢柱轴压承载力,进行了66根(共6种截面,5种长度)两端铰接的多肢拼合截面冷弯薄壁型钢柱轴压试验,研究了长细比、肢数及拼合形式对冷弯薄壁型钢多肢拼合柱轴压受力性能的影响。试验结果表明:长细比小于70的开口截面易发生畸变屈曲,闭口截面则发生局部屈曲;长细比大于70的试件则以整体屈曲破坏为主;随着试件的长度增加,其轴压承载力逐渐降低。相对于单肢截面,相同高度的拼合截面长细比减小,试件破坏形式随着长细比减小而从整体屈曲控制变为畸变屈曲和局部屈曲控制,轴压承载力提高。试验结果为多肢拼合截面柱设计计算提供了试验数据支持。

Copyright of Journal of Anhui Agricultural Sciences is the property of Journal of Anhui Agricultural Sciences 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.)

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Objective To explore the relationship and influence path between nurses’perceived work environment, hospital safety climate and nurses’ satisfaction. Methods Using convenience sampling method, 444 in-service nurses in a third-class A hospital in Chengdu City were selected as research subjects from September to November 2021, and the nurses were surveyed with the Nurses’ Perceived Work Environment Questionnaire. Hospital Safety Climate Scale, and Job Satisfaction Scale, and the correlation between hospital safety climate, Nurses’ perceived work environment and satisfaction were analyzed by Pearson correlation, and a path relationship model was established based on the correlation test, and a mediation effect test was conducted by Bootstrap method. Based on the results of the correlation test, a path relationship model was established, and the mediation effect test was conducted by Bootstrap method to deeply analyze the mediation effect of hospital safety atmosphere between Nurses’ perceived work environment and satisfaction. Results Nurses’ perceived work environment was positively correlated with satisfaction (r = 0.428, P < 0.01), hospital safety climate was positively correlated with Nurses’ work environment (r = 0.693, P < 0.01), hospital safety climate was positively correlated with Nurses’ satisfaction (r = 0.466, P < 0.01), Nurses’ perceived work environment positively predicted hospital safety climate (β = 0.773, P = 0.003), while the positive predictive effect on satisfaction was not statistically significant (β = 0.060, P = 0.530) . The value of the indirect effect of hospital safety climate between Nurses’ perceived work environment and satisfaction was 0.414 (95%CI 0.557-1.531), which accounted for 87.34% of the total effect. Conclusion Hospital safety climate acts as a complete mediator between Nurses’ perceived work environment and satisfaction, promoting a healthy and stable nursing workforce. [ABSTRACT FROM AUTHOR]

Copyright of Bulletin of Soil & Water Conservation is the property of Bulletin of Soil & Water Conservation 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.)

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目的　观察视网膜静脉阻塞患者血清微小核糖核酸-33a-5p (miR-33a-5p)、SMAD同源物 7 (SMAD7)水平 变化, 并探讨二者与视力预后的关系。方法　选择视网膜静脉阻塞患者 108例 (观察组), 同期体检健康的志愿者 108例 (对照组), 采集所有研究对象清晨空腹外周静脉血, 离心留取血清, 采用实时荧光定量聚合酶链式反应检测 血清miR-33a-5p, 采用ELISA法检测血清SMAD7。比较两组血清miR-33a-5p、SMAD7水平, 分析视网膜静脉阻塞患 者血清miR-33a-5p、SMAD7水平的关系。所有视网膜静脉阻塞患者予雷珠单抗玻璃体腔内注射治疗。治疗3个月, 评估视力, 其中预后不良57例、预后良好51例。采用多因素Logistic回归模型分析视网膜静脉阻塞患者视力预后不 良的危险因素。采用受试者工作特征 (ROC)曲线分析血清miR-33a-5p、SMAD7水平对视网膜静脉阻塞患者视力预 后不良的预测价值。结果　观察组血清 miR-33a-5p 水平低于对照组, 血清 SMAD7 水平高于对照组 (t 分别为 13. 362、38. 657, P均<0. 01)。Pearson相关分析显示, 视网膜静脉阻塞患者血清miR-33a-5p水平与血清SMAD7水平 呈负相关 (r=－0. 649, P<0. 05)。单因素分析显示, 视网膜静脉阻塞患者视力预后不良者合并高血压、高血脂比例 和有并发症比例以及血清SMAD7水平均高于其预后良好者 (χ² /t分别为13. 412、7. 342、10. 095、6. 394, P均<0. 05), 血清miR-33a-5p水平低于其预后良好者 (t=7. 373, P<0. 05)。多因素Logistic回归分析显示, 血清miR-33a-5p水平降 低、血清SMAD7水平升高和合并高血压、高血脂以及有并发症是视网膜静脉阻塞患者视力预后不良的独立危险因 素 (OR分别为 0. 683、3. 843、2. 146、1. 463、2. 773, P均<0. 05)。血清 miR-33a-5p、SMAD7水平预测视网膜静脉阻塞 患者视力预后不良的曲线下面积 (AUC)分别为 0. 870、0. 869, 二者联合预测视网膜静脉阻塞患者视力预后不良的 AUC为0. 938。血清miR-33a-5p、SMAD7水平联合预测视网膜静脉阻塞患者视力预后不良的AUC高于二者单独 (Z 分别为2. 419、2. 422, P均<0. 05)。结论　视网膜静脉阻塞患者血清miR-33a-5p水平降低、血清SMAD7水平升高; 血 清miR-33a-5p水平降低、血清SMAD7水平升高是视网膜静脉阻塞患者视力预后不良的独立危险因素; 血清miR-33a-5p、 SMAD7水平对视网膜静脉阻塞患者视力预后不良均有一定预测价值, 二者联合预测价值更高。 [ABSTRACT FROM AUTHOR]

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Objective To analyze the clinical manifestations and histopathological features of cutaneous Mycobacterium marinum infections in order to improve the understanding, diagnosis and treatment of this disease. Methods We retrospectively analyzed the clinical manifestations, histopathological features, treatment and outcome of 12 cases of cutaneous Mycobacterium marinum infections diagnosed at the Fifth Affiliated Hospital of Sun Yat-Sen University from 2020 to 2023. Results The average age was 47. 3 years. Seafood-induced trauma was a risk factor. Clinical presentations often included unilateral distribution of multiple chronic nodules and plaques on the upper limb, resembling sporotrichosis. Pathological findings included epidermal acanthosis, dermal non-specific inflammatory infiltration, and sometimes with tuberculosis-like granulomas. However, the positive rate of acid -fast staining was low ・ Nine patients received anti-infective therapy consisting of clarithromycin combined with rifampicin or moxifloxacin. The treatment regimen for other three patients was unknown. All patients experienced resolution of their skin lesions without serious adverse drug reactions, and there were no recurrences during 1・year follow-up・ Conclusions Mycobacterium marinum infection should be suspected in patients, especially middle-aged and elderly individuals with a history of trauma or handling seafood, presenting with chronic nodules and plaques, along with pathological findings of tuberculosis-like granuloma or non-specific inflammatory infiltration. These patients can be treated with clarithromycin and rifampicin. [ABSTRACT FROM AUTHOR]

Copyright of Science & Technology of Food Industry is the property of Science & Technology of Food Industry 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.)

舌侧孔是下颌骨前部中线的舌侧副孔，其在下颌骨舌面开口，朝下颌骨颊侧延续成舌侧管。舌侧孔的数 量一般在 1～12个之间，大部分舌侧孔直径都超过 1 mm。舌侧孔是下颌骨的重要标志，在舌侧开口并允许神经和 血管通过。舌侧管从皮质骨表面开始进入骨内，其内容物为微小血管和神经分支。下颌牙列缺失后，无牙颌骨的一 般形态会发生变化，牙槽嵴周围关键解剖结构也会发生变化，包括舌侧孔和舌侧管的位置会变的更加表浅。下颌牙 列缺失后，舌侧孔数量和舌侧管直径变化不明显。临床医生在进行下颌椎间孔区手术时，应注意舌侧孔和舌侧管的 位置，接近该区时需格外谨慎，预防手术事故发生。 [ABSTRACT FROM AUTHOR]

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With global warming, the risk assessment of extreme precipitation has become the focus of academic circles and governments of various countries. Therefore, in order to accurately analyze the trend and risk distribution of future flood disasters in the northern foothills of the Qinling Mountains under the global warming scenario, based on CMIP6 rainfall data, geographical data and socio-economic data, the game combination weighting method, entropy weight method and analytic hierarchy process were used to build a flood disaster risk assessment model. Flood disaster risk was assessed for two scenarios (SSP245 and SSP585) and two periods (2040-2060 and 2070-2090). The results show that: a) the high-hazard areas are mainly distributed in the Lantian area and low-lying mountain areas. With the change of years and different development scenarios, the risk has a significantly increasing trend. b) The high vulnerability areas are mainly distributed in Zhouzhi County, Huyi District, northern Chang’an District and mountain road areas. c) The areas with a high risk of extreme rainfall and flood disaster are mainly concentrated in Lantian County and Lintong District. The risk of flood induced disasters increases over time in different scenarios. [ABSTRACT FROM AUTHOR]

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