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通过试验，对新型螺纹锚固螺栓连接T形节点在高温后的拉伸性能进行了研究。此类螺栓直接锚固于带螺纹的螺栓孔内，无需螺帽，非常适合用于闭口截面钢构件的连接。试验采用全周期的加载方式，以考虑火灾高温和荷载大小对节点在火灾后受力性能的影响。对于节点板厚和螺栓直径等参数对节点受灾后受力性能的影响也进行了分析。螺栓孔厚度和螺栓直径共同决定了节点的破坏模式，且对节点的在火灾后的承载力有一定的影响。火灾温度和荷载大小影响了节点的破坏阶段，但是并不改变节点的破坏模式。对于火灾中未发生破坏的节点，极限承载力在冷却后可至少恢复至其常温承载力的80.9%以上，在火灾后仍具有良好的承载能力。

目的评价经远桡动脉入路对肝肿瘤患者行肝动脉持续灌注化疗（HAIC）的安全性和舒适性。方法纳入中山大学附属第一医院放射介入科行经远桡动脉入路进行HAIC的肝肿瘤患者，患者进行1次股动脉入路和1次远桡动脉入路穿刺置管进行自身交叉对照。患者留置导管于肝动脉内行FOLFOX4方案持续动脉灌注化疗。使用生活质量评分量表比较患者远桡动脉入路和股动脉入路的生活质量评分以及记录手术相关并发症。结果共纳入患者18例肝肿瘤患者，其中9例先进行股动脉入路后进行远桡动脉入路HAIC，其余9例则先远桡入路再进行股动脉入路HAIC。dTRA期间，穿刺点血肿2例，穿刺点持续疼痛3例，左手掌麻木1例，均为1~2级手术相关的不良事件。没有发生3~4级手术相关的不良事件。术后超声检查显示近端桡动脉均通畅。dTRA和TFA之间的穿刺时间差异有统计学意义（4分 vs. 3分，Pvs. 2.72，Pvs. 7 h，P

【目的】评估载药栓塞微球负载阿霉素联合甲磺酸阿帕替尼治疗中晚期原发性肝癌的安全性和近期疗效。【方法】对本中心采用载药微球经动脉化疗栓塞术（DEB-TACE）联合甲磺酸阿帕替尼治疗的原发性肝癌患者相关资料进行了回顾性分析。所有患者均只进行了1次DEB-TACE治疗，并在DEB-TACE术后推荐开始服用甲磺酸阿帕替尼500mg治疗。对术前及术后4~8周患者第一次随访的影像随访资料以及肿瘤生物学指标甲胎蛋白（AFP）进行分析，同时观察并记录治疗过程包括服用阿帕替尼在内的不良反应事件。【结果】根据实体瘤疗效评价标准（RECIST）、改良实体瘤疗效评价标准（mRECIST）及欧洲肝脏研究协会标准（EASL）结果显示，这11例患者的客观缓解率（ORR）分别为36.4%、63.6%、72.7%，疾病控制率（DCR）分别为90.7%、72.7%、81.8%。患者术后AFP平均水平为44251.7μg/L，较术前平均水平366336μg/L明显下降。有4例患者在服用甲磺酸阿帕替尼后出现Ⅲ级不良反应，其余患者均未出现Ⅳ级不良反应。【结论】使用载药栓塞微球负载阿霉素联合甲磺酸阿帕替尼治疗中晚期原发性肝癌的安全性较高，近期疗效良好。

【目的】研究阿霉素负载的直链烷基修饰的氧化石墨烯（DOX@GO-C18）作为药物载体经导管动脉化疗栓塞（TACE）治疗肝癌的安全性和有效性。【方法】制备并表征DOX@GO-C18。采用雄性新西兰大白兔建立VX2肝癌模型并以动态增强CT扫描明确肿瘤情况。在数字减影血管造影（DSA）引导下，以股动脉入路选择性插管至肝段动脉，通过微导管注射DOX@GO-C18的碘油分散液对肿瘤行TACE治疗。术前及术后第1、3、5、7和14天取外周静脉血液样本行肝功能检查，术后第14天行动态增强CT扫描并对肿瘤行HE染色、油红染色及DAPI荧光染色。【结果】DOX@GO-C18能稳定分散在碘油中。肝癌病灶在治疗前后的最大直径无明显变化，肿瘤血供明显减少。采用RECIST1.1标准进行评价，目标病灶治疗反应均为疾病稳定。病理学检查可见DOX@GO-C18伴随碘油主要沉积于肿瘤内，并释放DOX，肿瘤出现坏死。血清学检查显示术后出现一过性肝酶学异常，在2周内可恢复至正常水平。【结论】本研究初步证明DOX@GO-C18可作为一种应用于肝癌的TACE治疗的有效药物载体，其安全性可控。

媒体分发服务器是网络视频监控平台中负责流媒体分发的重要模块。网络地址转换器（Network Address Translator,NAT）能很好地解决IPv4地址资源匮乏的问题,但同时也给各个私网用户之间或私网与公网用户之间的通信带来了障碍。文章主要介绍这种NAT障碍的形成,并给出了会话初始协议（SIP）下媒体分发服务器实现NAT穿越的一种方案。

【目的】研究白介素(interleukin, IL)-8 基因- 251A/T 位点多态性在中国高、低发区普通人群和胃癌 (gastric cancer , GC)患者中的分布, 并探讨其基因多态性与我国胃癌的关系。【方法】用聚合酶链反应- 反向杂 交法(polymerase chain reaction and reverse dot blot, PCR-RDB)检测我国胃癌低发区( 广东省) 104 例健康人和 104 例胃癌患者和胃癌高发区( 陕西省) 102 例健康人和102 例胃癌患者的IL-8 基因- 251A/T 位点多态性。【结 果】在胃癌低发区, 胃癌患者IL-8-251 A/A 基因型的频率略高于正常对照组, 但未达统计学意义(27.9 % vs 21.2 % , χ2=1.27, P >0.05), 胃癌患者携带IL-8-251 A/A 基因型不增加Hp 感染后胃癌发生的危险性(χ2=1.40, P >0.05), 而在胃癌高发区, 胃癌患者携带IL-8-251 A/A 的频率明显高于普通人群(31.2% vs 16.7% , χ2=6.04 , P< 0.05,OR=2.29, 95% CI=1.17- 4.46), 并增加Hp 感染后胃癌发生的危险性(χ2=6.38, P< 0.05,OR=4.71, 95% CI=1.36- 16.30)。【结论】IL-8-251A 等位基因与我国汉族人群胃癌的发生相关, 以高发区明显。

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Copyright of Uranium Geology is the property of Uranium Geology 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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晶体管载波没备中的自动电平调节装置基本上都使用热电式的,即调节放大器中采用热敏电阻作为增益（或增益频率特性）的可调元件。自动调节时,将收到的导频与参考电平比较,并将其误差予以放大之后作为热敏电阻的加热电流,使其阻值变化而改变放大器的增益,达到调节的目的。这个闭环回路通常如图1所示。

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In order to cultivate large diameter timber of Phoebe bournei, we conducted a 3-year soil loosening experiment on Phoebe bournei middle-aged stands. The main findings are as follows: loosening the surface soil, causing a decrease in soil bulk density, which increases year by year over time; an increase in soil capillary and non capillary pores, which decrease year by year; an increase in the natural moisture content and maximum water capacity of the soil, and over time, the natural moisture content and maximum water capacity decrease year by year; the growth of stands is accelerated, and the diameter at breast height, tree height, and volume growth are significantly higher than those of forests without loose soil, and the larger the soil loosening area, the better the growth. For cultivating large diameter timber of Phoebe bournei, it is recommended to do soil loosening operation every 3-5 years. [ABSTRACT FROM AUTHOR]

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Polyethylene terephthalate PET is commonly used in textiles and apparel automotive interior and other fields due to its excellent properties such as high strength and chemical stability. With the rapid development and expansion of polyester textiles the accumulation of waste polyester textiles is also increasing year by year. However the waste polyester textiles are difficult to be degraded naturally posing a significant environmental threat. Recycling waste PET textiles is therefore crucial. Previous studies have identified two main methods for recycling waste polyester textiles the physical method and the chemical method. The physical method involves regenerating the textiles through simple melting and granulation but this method does not produce recycled products with good quality and stable performance. The chemical method involves using a depolymerising agent to break down waste polyester textiles into small molecules. These molecules are then polymerized to create a recycled polyester product. This process is a crucial method for producing highquality recycled polyester products. Currently chemical methods primarily consist of hydrolysis alcoholysis and enzymatic hydrolysis. Among them the glycol alcoholysis-methanol ester exchange method has gained popularity due to its mild reaction conditions. However it suffers from low product yield and the formation of oligomers during the alcoholysis stage. Additionally the ester exchange stage requires a complex product purification process. Current research is focused on addressing these issues. To address the issues of low product yields and increased oligomers in the glycolysis-methanol ester exchange process this study suggested the use of K2 CO3 / KOH synergistic alcoholysis on discarded polyester textiles. Firstly the inexpensive potassium carbonate was used as the primary catalyst in the alcoholysis stage. KOH was also introduced to co-polymerize the waste polyester textiles. Secondly the response surface method was employed to optimize the process parameters in the alcoholysis stage resulting in the identification of the optimal process parameters. Finally the purification method was optimized in the ester-exchange stage based on the phase transition property of DMT leading to the preparation of highpurity regenerated DMT. This paper introduced the use of KOH in the alcoholysis stage to co-polymerize waste polyester textiles. This reduced the oligomer content in the alcoholysis products and increased the BHET yield. In the ester exchange stage a simple decompression sublimation method was used to purify the regenerated DMT. The purification process was also optimized. The experimental results indicate that the K2 CO3 / KOH synergistic alcoholysis of waste polyester textiles primarily produced BHET. The regenerated BHET yield demonstrated an increasing trend with the addition of KOH peaking at 70. 2% when the KOH addition reached 2%. The process parameters of the alcoholysis stage were optimized by using response surface methodology. The optimal conditions were determined to be a reaction temperature of 210 ℃ a reaction time of 120 minutes K2 CO3 content of 2. 0% and KOH content of 2. 4%. These conditions resulted in a regenerated BHET yield of 73. 1%. The regenerated DMT achieved a purity of over 99% after undergoing purification through decompression sublimation during the ester exchange stage. Efficient purification of the regenerated DMT was achieved. To enhance the reaction efficiency and product yield of waste polyester textiles a cost-effective and viable method is the synergistic depolymerization of waste polyester textiles with K2 CO3 / KOH to prepare regenerated DMT. The research provides valuable reference for the environmentally friendly recycling of waste polyester textiles and lays a foundation for producing high-quality regenerated polyester downstream. [ABSTRACT FROM AUTHOR]

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In order to accurately identify earthquake loads on bridges in actual service environment, the monitoring deflection and acceleration data of a bridge before and after earthquakes are obtained by bridge monitoring method, and six structural effects that are sensitive to earthquakes are selected. The time-varying regularities and probability statistical characteristics of the six structural effects under daily loads and earthquakes are analyzed. The normal distribution function, Weibull distribution function and generalized extreme value distribution function are used to fit the probability density, and the best probability density function is determined. The thresholds of the six structural effects are calculated using the probability density function, which are feasible to identify the occurs of earthquakes. The probability statistical characteristics of the monitoring deflection and acceleration data is well described by the generalized extreme value distribution function. The monitoring results show that when the earthquake occurred, all the measured maximum absolute values of the six structural effects were greater than that of the thresholds, indicating that the proposed identification method of bridge earthquakes is effective. [ABSTRACT FROM AUTHOR]

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目的 探讨应用支架样取栓装置对前循环大动脉闭塞所致急性缺血性卒中患者机械取栓治疗的临 床效果。 方法 连续纳入采用支架样取栓装置治疗的前循环急性颅内大动脉近端闭塞患者。分析纳入患 者的临床特征、影像学资料、治疗及术后90 d临床随访结果。以术后90 d改良Rankin量表（modified Rankin Scale，mRS）评分为主要指标评估治疗有效性，以症状性颅内出血率、术后90 d死亡率评估治疗 的安全性。 结果 共纳入30例患者，29例应用Solitaire，1例应用Trevo。平均年龄（65.97±11.67）岁。入院时美国 国立卫生研究院卒中量表(National Institutes of Health Stroke Scale，NIHSS)评分中位数13.50（9.75， 18.00）。包括颈内动脉闭塞9例，大脑中动脉M1段闭塞20例，大脑前动脉A1段闭塞1例。术后90 d随访， 56.7%（17/30）患者预后良好（mRS评分0～2分）。术后发生症状性颅内出血率13.3%（4/30），术后 90 d死亡率20%（6/30）。 结论 支架样取栓装置在前循环大动脉闭塞性急性缺血性卒中取栓治疗中临床效果较好，其有效 性、安全性能够在真实世界中得到体现，是治疗急性颅内大动脉闭塞的有效方法。 Abstract: Objective To investigate the clinical effect of stent-like retrievers for mechanical thrombectomy in ischemic stroke patients due to large vessel occlusion. Methods Patients treated with stent-like retrievers for mechanical thrombectomy caused by proximal arterial occlusion in anterior cerebral circulation were enrolled consecutively. Their clinical features, imaging data, treatments and the results of 90-day follow up were analyzed. The major efficacy measure was assessed with modified Rankin Scale (mRS) at 90 days after onset. The safety measures were assessed with symptomatic intracranial hemorrhage (sICH) and mortality at 90 days. Results Of the 30 enrolled patients, 29 were treated with Solitaire and 1 with Trevo. The mean age was (65.97±11.67) years old, and median baseline National Institutes of Health Stroke Scale (NIHSS) score was 13.50 (9.75, 18.00). Nine of them had internal carotid artery occlusion, 20 had the M1 segment of the middle cerebral artery occlusion and 1 had the A1 segment of the anterior cerebral artery occlusion. The proportion of favorable functional outcome (mRS 0-2 at 90 days) was 56.7% (17/30). sICH rate was 13.3% (4/30), and the mortality at 90 days was 20% (6/30). Conclusion The effect of stent-like retrievers for mechanical thrombectomy in ischemic stroke patients due to anterior cerebral circulation large vessel occlusion is relatively good. Its efficacy and safety can be reflected in the real world, and it is an effective method for the treatment of acute intracranial artery occlusion.

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