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目的了解华南地区某肿瘤专科医院就诊患者的艾滋病病毒（HIV）、梅毒螺旋体（TP）、丙型肝炎病毒（HCV）、乙型肝炎病毒（HBV）感染现状，分析确诊检查完成情况，为加强常见传染病管理和制定医院感染防控策略提供参考。方法对2022年华南地区某肿瘤专科医院就诊的门诊、住院患者的传染病初筛项目HIV抗原抗体联合检测（HIV-comb）、梅毒螺旋体特异抗体（Anti-TP）、丙肝抗体（Anti-HCV）、乙肝表面抗原（HBsAg）的阳性检出率及进一步完成确诊项目检查的检测率进行统计分析。结果2022年就诊患者的HIV-comb阳性率为0.07%，100%患者进一步完成HIV补充确证试验，HIV总体患病率为0.06%；Anti-TP阳性率为1.99%，100%患者进一步完成梅毒螺旋体颗粒凝集试验（TPPA）及甲苯胺红不加热血清试验（TRUST）检测，梅毒总体患病率为0.51%；Anti-HCV阳性率为0.90%，仅26.61%患者进一步完成丙肝RNA定量检测，其中26.44%患者丙肝RNA高于检出下限；HBsAg阳性率为21.06%，仅54.40%患者进一步完成乙肝DNA定量检测，其中51.60%患者乙肝DNA高于检出下限。其中，门诊疑似肝炎患者核酸检测完善率低于住院（PP

在新一代信息技术与智慧教育深度融合的时代背景下，智慧教室系统的研究与应用受到广泛的关注。然而，当前智慧教室系统的应用还处于起步阶段，其缺乏对学生的实时性反馈及实时正向干预功能。针对此问题，首先通过构建基于情感学习的智慧教室系统，引入边缘计算来提高课堂实时性和智能化程度，以实现学生学习期间情感状态的实时性反馈。其次，为提升智慧教室系统的性能，利用凸优化相关理论实现系统资源的优化分配。最后，通过验证，智慧教室系统的多资源联合优化方法可以有效降低设备数据采集及处理的最大时延，能极大地提高智慧教室系统的情感计算实时性能；系统不盲目追求平均时延最小化，有效避免出现单一用户因实时性差而体验不佳的情况。该系统和算法成果对未来智慧教室的建设具有借鉴和参考意义。

目的为了解肿瘤医院院感情况及其变化趋势，探讨肿瘤专科医院感染防控重点策略。方法通过医院感染监测系统获取中山大学肿瘤防治中心2019~2021年医院感染质量控制指标数据，采用卡方检验和趋势卡方检验对指标变化进行分析。结果2019~2021年该院院感发生率分别为0.80%、0.78%和0.57%，逐年显著下降（PPP>0.05），仍处较高水平。结论2019~2021年该肿瘤专科医院院感情况总体得到改善。呼吸系统和手术部位、产超广谱β-内酰胺酶细菌为主的多重耐药菌及三管相关感染防控是肿瘤专科医院医院感染防控工作薄弱环节，应重点推进。

为将400 Gbit/s高速率应用于超长站距无中继光传输系统,首先对400 Gbit/s双偏振-四进制正交幅度调制（DP-16QAM）及400 Gbit/s双偏振-八进制正交幅度调制（DP-64QAM）两种高阶调制码型及其对应的光信噪比（OSNR）要求进行了研究,然后通过实验研究了两种码型背靠背OSNR的要求及入纤光功率与误码率的关系,最后搭建了具有前后向拉曼放大器的400 Gbit/s超长距光传输链路,通过实验测试了两种码型对应的最远单跨传输距离。实验结果表明,400 Gbit/s DP-16QAM在G.652光纤上利用双向拉曼光放大器最远可以传输286 km,对于电力长跨距来说基本满足了大部分的应用场合。

针对下一代动态光网络,光纤长度可能根据链路需要随时变化,以及由于光纤老化造成色散参量变化等因素可能造成链路中的色散值在接收端很难提前预知,因此要求未来光网络节点中的接收端能够自适应地估计出色散值然后补偿信号。文章在光网络节点的数字相干接收机中提出了一种基于峰均值功率比的色散估计算法,并在224 Gbit/s偏振复用（PDM）-16正交振幅调制（QAM）和336 Gbit/s PDM-64QAM的多种长距离传输（400、800、1 200、1 600和2 000 km标准单模光纤（SSMF））系统中验证了其可行性及有效性。仿真结果表明,文章所提算法具有很好的色散估计精度,色散估计标准差低于100 ps/nm。该算法对偏振模色散（PDM）和偏振相关损耗（PDL）具有较强的容忍性,例如群速度时延（DGD）低于15 ps及PDL在7 dB以内时,算法都可实现很好的估计精度。同时该算法对非线性效应也具有较强的容忍性。

为研究薄壁槽钢整体屈曲下的数值算法的适用性,以4种不同杆端约束下的薄壁槽形截面压杆为研究对象,根据广义梁理论确定其发生弹性整体屈曲的有效长度及临界荷载,与开口薄壁理想压杆的线性及非线性解析解进行对比,得到一致的临界荷载。利用ABAQUS有限元分析软件建立壳体有限元模型,采用杆端截面形心集中加载,依据约束情况确定杆端约束,以及根据有效长度施加不同初始缺陷的计算模型,开展特征值算法和隐式弧长法数值计算分析。计算结果表明:当开口薄壁压杆的有效长度足够大时,临界荷载的特征值数值解与理论解一致,弧长法计算得到的非线性解误差相对较大。当有效长度不够大时,弧长法计算得到的极限荷载与理论解基本一致,且弧长法可有效追踪后屈曲路径。

文章提出了一种新的应用于高速光纤通信系统接收端的数字背向传输（DBP）算法的步长变换选择方法。通过采用斜线方法对光纤非线性系数的指数形式曲线进行近似,找出使斜线的斜率与原曲线各点斜率差值最小情况下的步长,再用于变步长DBP算法中对光纤传输中的非线性损伤进行补偿。在3 200km单信道25Gbaud光纤传输系统中对所提步长选择方案进行了仿真。结果表明,在相同系统中,与其他步长选择方法相比,在最佳入纤功率时所提步长选择方案的Q值提升了0.5dB;当入纤功率越大、非线性效应越强时,所提方法对于光纤传输非线性损伤的补偿能力更好,而算法复杂度没有改变。

提出了一种基于多步插值的频偏估计算法,用于相干光通信中数字相干接收机的频偏估计补偿。该算法首先采用少量的数据点作FFT（快速傅里叶变换）,粗估计出频偏值,然后采用DFT（离散傅里叶变换）进行多步插值计算,降低了计算复杂度。在一个28GBaud的QPSK（正交相移键控）仿真系统中进行了仿真验证,结果表明,与最新报道的LS（最小二乘）算法相比,该文所提算法可以大大降低现有算法的复杂度。

提出了一种应用于双向拉曼放大超长单跨距光纤传输系统的低复杂度数字背向传输算法,该算法基于在接收端电域中反向求解薛定谔方程,可以在补偿光纤传输系统中色散的同时抑制非线性效应;基于双向拉曼放大系统对算法的功率曲线等进行了优化设计,降低了算法的复杂度;搭建了一个10Gbaud/s正交相移键控调制的双向拉曼传输实验系统,传输距离为320km。实验结果表明,优化后的数字背向传输算法的性能较传统算法提升了0.71dB。

对一种移除调制相位信息的算法进行了进一步研究,使其适用于更高阶调制格式的相干系统。该算法对接收到的复数信号的实部和虚部分别采用绝对值操作,移除调制的相位信息。通过对28GBaud的64QAM（64阶正交幅度调制）相干系统进行仿真,来研究该算法在64QAM系统中的性能。仿真结果表明,该算法无需乘法器,而且在频偏估计中的性能与传统的M次幂运算的性能接近。因此,该算法相比M次幂运算在性能不变的情况下,降低了算法的复杂度。

文章介绍了利用新型SMF-28ULL超低损耗光纤作为传输介质,使用相位啁啾、前向拉曼、增强型前向纠错（FEC）以及前置随路远程泵浦光放大（ROPA）技术,实现了2.5Gbit/s系统无中继521km的超长站距传输,这也是迄今所报道的使用前置随路ROPA技术所实现的距离最远的传输。

由因特网工程任务组（IETF）路径计算单元（PCE）工作组定义的基于PCE的多协议标签交换/通用多协议标签交换（MPLS/GMPLS）网络结构能有效解决多层网络中端到端的路径计算问题。文章从自动交换光网络（ASON）路由技术的发展趋势出发,根据有关PCE的RFC文档对PCE的体系结构、发现机制和策略进行了较为系统的说明,重点对PCE在ASON路由中的应用及PCE路径保护和恢复机制进行了阐述,表明PCE技术将成为ASON路由技术的首要选择。

TAP（Test Access Port/Traffic Access Port）是一种新兴的用于网络监测的硬件设备,它提供了一种在不中断网络正常流量的情况下,获得网络流量的方法。因此,TAP可以用来实现监测网络性能、解决网络故障、分析网络流量和阻止恶意攻击等一系列功能。文章阐述了TAP的产生背景、主要特点、工作原理及其应用。

标准化的网络节点接口信息结构是将来网络互通的基础 .同时也为各设备生产商提供了标准的规范和设计依据 .文章介绍了光传送网的分层结构和节点特征信息

阐述了以太网与以太网无源光网络（EPON）传输方式的本质区别,同时从物理层角度分析EPON系统对突发信号的处理,着重分析了突发模式接收机的原理和试验。分析了试验现象,给出了解决方案,同时描述了上层芯片是如何处理接收到的突发信号的。

对DP-QPSK（偏振复用正交相移键控）调制和相干接收技术在低速系统中的应用进行了研究,实现了2.67Gbit/s速率的实时传输。实验结果表明,DP-QPSK调制和相干接收技术对无中继ULH（超长跨距）光传输系统的OSNR（光信噪比）容限有优化作用。

针对特高压电网建设对超长距传输提出的更高要求,提出了新的技术方向——塔内光中继。分析了塔内光中继的理论依据并设计了技术方案,在哈密郑州特高压直流输电光纤通信工程石城至环县段实现了我国首个塔内光中继实验工程,工程顺利开通,运行稳定,验证了塔内光中继方案的可行性。随着我国电网建设的不断发展,塔内光中继将得到更广泛的应用。

关于棕熊（Ursus arctos）的报道,多为生态与繁殖方面的文献,而组织学研究很少.到目前为止,尚未见到比较系统和完整的棕熊消化腺的组织学研究资料.因此,本研究以棕熊的

2003年7月18日在平潭岛观测到白玄鸥7只；2004年1月18日在闽江河口观测到白领翡翠1只；2004年11月27日在闽江河口观测到白眼潜鸭30只；2006年5月3日在福建龙栖山国家级自然保护区内观测到斑头大翠鸟2只,上述4种均为福建省鸟类新纪录。2003～2005年冬季在闽江河口和兴化湾均观测到黄腿银鸥,这一亚种为福建省新纪录。

Copyright of Journal of Food Safety & Quality is the property of Journal of Food Safety & Quality Editorial Department 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 Northwest A & F University - Natural Science Edition is the property of Editorial Department of Journal of Northwest A&F University (Natural Science Edition) 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 Chinese Journal of Tissue Engineering Research / Zhongguo Zuzhi Gongcheng Yanjiu is the property of Chinese Journal of Tissue Engineering Research 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.)

Objective To apply and evaluate the midwifery quality evaluation index system constructed in the early stage and verify its practical value as a midwifery quality evaluation tool. Methods Thirteen hospitals of different grades and natures in the Pan-Yangtze River Delta region were selected as the research objects. Three comprehensive evaluation methods, weighted technique for order preference by similarity to ideal solution (TOPSIS) method, weighted rank sum ratio (WRSR) method and simple additive weighted (SAW) method, were used to rank the quality of midwifery in the 13 hospitals. The results of the 3 methods were comprehensively ranked by the combination evaluation method. Kendall concordance coefficient was used to test the consistency of the three comprehensive evaluation results. Results The 13 hospitals consist of 3 comprehensive hospitals of Grade Ⅲ Class A, 3 obstetrics and gynecology hospitals of Grade Ⅲ Class A, 1 comprehensive hospital of Grade Ⅲ Class B, 2 obstetrics and gynecology hospitals of Grade Ⅲ Class B, 1 comprehensive hospital of Grade Ⅱ Class A, 2 obstetrics and gynecology hospitals of Grade Ⅱ Class A, and 1 obstetrics and gynecology hospital of Grade Ⅱ Class B. Although the ranking results of the 13 hospitals evaluated by the 3 comprehensive evaluation methods were slightly different with the Kendall harmony coefficient W =0.794, which proved that they had high consistency. Top 4 of the 13 hospitals by the combination evaluation on the midwifery quality were H10, H4, H1 and H2. It was basically consistent with the predicted result of the research hypothesis (H1, H2 and H10 should be among the best in midwifery quality). Conclusion The evaluation results of midwifery quality evaluation index system are stable. The index system can reflect the midwifery quality and has high clinical practical value which can be used as a scientific tool for midwifery quality evaluation [ABSTRACT FROM AUTHOR]

Copyright of Chinese Medical Equipment Journal is the property of Chinese Medical Equipment Journal 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 Guangdong Medical Journal is the property of Guangdong Medical Journal 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.)

BACKGROUND: The regulation of intestinal flora by exercise is closely related to human health, but intestinal flora involves many factors. Existing studies have lacked consistent evidence on the effect of exercise on the intestinal flora of college students. OBJECTIVE: To explore the effects of exercise on intestinal flora diversity and species composition of college students. METHODS: Through systematic search of PubMed, Web of Science, Embase, Medline, Cochrane Library, CNKI, WanFang Database and VIP database, eight empirical studies were selected and included, and semi-quantitative analysis was performed on them. RESULTS AND CONCLUSION: In terms of the species diversity of the intestinal flora, both high-intensity interval training and Tai Chi exercise significantly enhance the species diversity of intestinal flora in college students, while aerobic exercise does not have a significant effect on the enhancement of intestinal flora diversity in college students. In terms of the species composition of the intestinal flora, all three exercise modalities significantly alter the compositional structure of the intestinal flora in college students, which can increase the abundance of beneficial bacteria such as Ruminalococcus, Faecalis prevotelli, Blautia, and decrease the abundance of harmful bacteria such as Escherichia spp. Compared with high-intensity interval training, aerobic and Tai Chi exercise causes more elevated abundance of beneficial bacteria. In addition to changes in intestinal flora characteristics, exercise improves body composition, cardiorespiratory function, and executive function in college students, and these health benefits are closely linked to exercise-induced changes in intestinal flora that can produce health benefits for the body through metabolic regulation, barrier function, and neuromodulation. Although studies have confirmed the association between exercise and intestinal flora, the mechanism by which exercise affects intestinal flora has not yet been clarified, and at the same time, localizing the flora related to the host health is the key to targeting intestinal flora as a therapeutic target in the future, all of which are worthy of further attention and investigation. [ABSTRACT FROM AUTHOR]

BACKGROUND: The micro/nanostructured gradient biomimetic surface of implant materials can simulate the structure of the extracellular environment in human bone tissue, thereby achieving perfect bone integration function. However, further research is needed on the mechanisms by which the surface microstructure of bone implant materials regulates cell function and promotes osteogenesis. OBJECTIVE: To analyze the effect of titanium sheet microstructure surface on osteogenic differentiation of MC3T3-E1 osteoblasts. METHODS: (1) At a constant voltage of 5 V or 20 V, nanotube arrays of different diameters were prepared on the surface of titanium sheets by acid etching and anodic oxidation techniques, and were recorded as group R5 and group R20, respectively. The surface morphology, roughness, and hydrophilicity of pure titanium sheet (without acid etching or anodizing treatment) were measured in group R5 and group R20. (2) MC3T3-E1 osteoblasts of logarithmic growth stage were inoculated on the surface of pure titanium sheets, R5 group and R20 group respectively. After 24 hours of osteogenic induction culture, the expression of mechanical sensitive channel protein 1 was analyzed by RT-PCR and immunofluorescence staining. Osteoblast inducible base with or without the mechanosensitive channel protein 1 activator Yada1 was added, and alkaline phosphatase staining was performed after 7 days of culture. Alizarin red staining was performed after 14 days of culture. RESULTS AND CONCLUSION: (1) The surface of pure titanium sheets was smooth under scanning electron microscope. Relatively uniform and orderly nanotube arrays with average diameters of about 30 nm and 100 nm were observed on the surface of titanium sheets of groups R5 and R20, respectively. The results of scanning electron microscope were further verified by atomic force microscopy. The surface roughness of titanium sheet of group R5 was higher than that of pure titanium (P < 0.05), and the water contact angle was lower than that of pure titanium (P < 0.05). The surface roughness of titanium sheet in group R20 was higher than that in group R5 (P < 0.05), and the water contact angle was lower than that in group R5 (P < 0.05). (2) RT-PCR and immunofluorescence staining showed that the expression of mechanosensitive channel protein 1 in group R5 was higher than that in pure titanium group (P < 0.05), and the expression of mechanosensitive channel protein 1 in group R20 was higher than that in group R5 (P < 0.05). Under the osteogenic induction, compared with the condition without Yada1, there were no significant changes in the activity of alkaline phosphatase and the deposition of calcified nodules in pure titanium group after Yada1 addition, while the activity of alkaline phosphatase and the deposition of calcified nodules in groups R5 and R20 after Yada1 addition were significantly increased (P < 0.05). With or without Yada1, the alkaline phosphatase activity and calcified nodule deposition in group R5 were higher than those in pure titanium group (P < 0.05), and the alkaline phosphatase activity and calcified nodule deposition in group R20 were higher than those in group R5 (P < 0.05). (3) The results show that the surface microstructure of titanium sheet can promote the osteogenic differentiation of osteoblast MC3T3-E1 by activating mechanosensitive channel protein 1. [ABSTRACT FROM AUTHOR]

黑叶猴（Presbytis francoisi Pousargues）又名乌猿。列为我国第一类保护动物。黑叶猴体型纤瘦,头小尾长,无颊囊,头顶有一撮冠毛,两颊从耳尖至嘴角各有一条白毛,形似胡须。雌兽在会阴区至腹股沟内侧有一块花白斑,略呈三角形,这是区别雌雄兽的主要外部特征之一。成年兽体毛黑色。初生幼兽除尾巴灰黑色外,其余体毛金黄色,约一个月后逐渐向黑色转变,到一岁左右毛色变为黑色。

Two innovative existing concrete beam-shear link(ECB-SL)composite connections with endplate anchor bolt and U-shaped three sides anchor bolt were proposed to effectively improve the seismic performance between shear link and existing concrete beam. In this paper, specimens ECB-SL-1 with endplate anchor bolt and ECB-SL-2 with U-shaped three sides anchor bolt were firstly studied by the cyclic loading tests. Finite element(FE)method was validated by comparing with the test results and then used to analyze the two composite connection specimens, while each connection contained 12 FE models to investigate the influencing factors of concrete strength, post anchorage bolt length and post anchorage bolt diameter. The test results show that the specimen ECB-SL-1 occurs the unexpected failure modes of anchor bolts tension, which cannot have enough bearing capacity. Specimen ECB-SL-2 has experienced the same failure mode and bearing capacity with the pure very short shear link. Increase of the concrete strength, post anchorage bolt length and post anchorage bolt diameter in composite connection with endplate anchor bolt can effectively improve the bearing capacity and displacements, while the post anchorage bolt length and post anchorage bolt diameter have no obvious effect on the concrete damage. However, increase of the concrete strength, post anchorage bolt length and diameter has a very limited effect on the mechanical property of composite connection with U-shaped three sides anchor bolt, so it is only needs to satisfy the suggested values. [ABSTRACT FROM AUTHOR]

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Objective This study aims to investigate the effect of resveratrol on neuronal damage in rats with acute cerebral infarction (ACI) by regulating the high-mobility group protein B1 (HMGB1) /Toll-like receptor 4 (TLR4) / nuclear factor-κB (NF-κB) signaling pathway. Methods Rats were randomly separated into blank group, infarction group, resveratrol group, HMGB1 activator (recombinant rat HMGB1 protein, rRHMGB1) group, and resveratrol+ rRHMGB1 group, with 18 rats in each group. Except for the blank group, rats in all other groups were used to construct ACI models using the method of middle cerebral artery occlusion. Drug treatment began at 1 hour after successful modeling, once a day, for 7 days. Changes in neurological impairment score and cerebral infarction volume coefficient were detected. ELISA was applied to detect levels of tumor necrosis factor-α (TNF-α), interleukin-1β (IL-1β), and IL-6 in infarction region of brain tissue. Nissl staining was applied to detect the number of surviving neurons in infarction region of brain tissues. TUNEL staining was applied to detect neuronal apoptosis in infarction region of brain tissue. Western Blot was applied to detect Bcl2 associated X protein (Bax), TLR4, Cleaved Caspase-3, HMGB1, and p-NF-κB p65 protein in brain tissue. Results Compared with the blank group, the neurological damage score, cerebral infarction volume coefficient, levels of TNF- α, IL-1β, IL-6 in the infarction region of brain tissue, neuronal apoptosis rate, Bax, TLR4, Cleaved Caspase-3, HMGB1, p-NF- κB p65 protein increased in the infarction group, while the number of surviving neurons in the infarction region of brain tissue decreased (P＜0.05). Compared with the infarction group, the neurological damage score, cerebral infarction volume coefficient, levels of TNF-α, IL-1β, IL-6 in the infarction region of brain tissue, neuronal apoptosis rate, and protein expression of Bax, TLR4, Cleaved Caspase-3, HMGB1, p-NF- κB p65 decreased in resveratrol group and resveratrol+rRHMGB1 group, the number of surviving neurons in the infarction region of brain tissue increased (P＜0.05). Change of the corresponding indicators in the rRHMGB1 group was opposite to that in the resveratrol group (P＜0.05). Compared with the resveratrol group, the neurological damage score, cerebral infarction volume coefficient, levels of TNF-α, IL-1β, IL-6 in the infarction region of brain tissue, neuronal apoptosis rate, the protein expression of Bax, TLR4, Cleaved Caspase-3, HMGB1, p-NF-κB p65 increased in the resveratrol+rRHMGB1 group, the number of surviving neurons in the infarction region of brain tissue decreased (P＜0.05). Conclusion The mechanism by which resveratrol improves neuronal damage in ACI rats may be related to the inhibition of the HMGB1/TLR4/NF-κB signaling pathway. [ABSTRACT FROM AUTHOR]

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