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单层网壳结构的安全性很大程度上取决于其稳定承载力，而其制作及安装过程中产生的节点几何偏差初始缺陷对其稳定承载力具有重大影响。对单层网壳结构初始几何缺陷场模拟方法的研究进展和现行规范的规定进行了系统综述和分析，结果表明既有的随机性模拟法、确定性模拟法和半随机性模拟法均存在一定问题，规范所推荐的初始缺陷模拟方法脱离实际，因而无法准确确定单层网壳结构稳定承载力的真实概率模型。因此，亟待提出一种考虑结构拓扑约束、基本假定合理、计算成本可控的初始几何缺陷场模拟方法，为完善单层网壳结构整体稳定分析方法提供科学依据，并为分析其稳定可靠度提供理论基础。

单层网壳结构的安全性很大程度上取决于其稳定承载力，而制作及安装过程中产生的节点几何偏差初始缺陷对其稳定承载力具有重大影响。对单层网壳结构初始几何缺陷场模拟方法的研究进展和现行规范规定进行了系统综述和分析，结果表明既有随机性模拟法、确定性模拟法和半随机性模拟法均存在一定问题，规范所推荐的初始缺陷模拟方法欠实际，从而无法准确确定单层网壳结构稳定承载力的真实概率模型。因此，亟待提出一种考虑结构拓扑约束、基本假定合理、计算代价可控的初始几何缺陷场模拟方法，为单层网壳整体稳定分析方法的完善提供科学依据，并为其稳定可靠度的分析提供理论基础。

针对无线光通信（WOC）技术高频谱效率以及低误码率的需求，文章提出了一种脉冲幅度调制（PAM）与脉冲位置调制（PPM）联合的调制方法，在传统调制技术的基础上充分利用无线通信带宽资源提高了传输速率。系统采用空域映射（SM）方式将不同幅度脉冲映射至特定激光器，并通过映射关系完成多链路分层传输。与传统单调制方式相比，联合调制技术通过编码机制的协调配合，利用脉冲的幅度以及所在时隙位置的变化来传递信息。实验测试证明，采用联合调制分层传输技术，通过同时发送和检测每个数据脉冲的时隙位置及幅度信息，不仅提升了系统频谱效率和传输速率，误码性能也得到了有效改善，实验结果为后续应用研究提供了一种新的技术途径。

能源互联网时代，用户参与能源消费与生产的互动将变得容易。在此背景下，区别于传统意义上用户用能成本的概念，提出了用户用能三重价值概念—空间价值、时间价值、柔性价值，来反映用户参与能源消费与生产互动中的用能价值。分析了用户用能的柔性价值挖掘对系统优化运行的影响，构建了考虑用户用能柔性价值的电力系统优化运行模型。该模型计及了柔性价值挖掘对系统功率平衡和备用容量约束的影响。多个场景下的算例研究表明，通过挖掘用户用能的柔性价值，不仅能有效增加风电消纳能力，还可以明显降低系统运行成本和碳排放。

能源互联网的快速发展为传统能源电商的升级带来了新的机遇。面对能源变革、国企改革的新形势，加快提升能源电商的地位与作用，形成新一代能源电商发展模式是促进能源企业转型的重要手段。本文在梳理传统能源电商发展现状与存在问题的基础上，引入Osterwalder商业模式组成要素模型，以电网企业为例分析了电商在企业经营活动中的地位变化，并通过SWOT分析模型研究了电网企业建设电商平台的内部优势、劣势与外部机遇、威胁，为能源企业建设新一代能源电商提供借鉴与参考。

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Attention deficit hyperactivity disorder (ADHD) is a chronic disease characterized by incommensurate attention concentration, excessive activity regardless of occasions, and impulsive emotional behavior. This article reviews the genetic association studies of ADHD candidate genes at home and abroad from 2017 to 2022.The analysis shows that ADHD may be the result of the cumulative effect of multiple candidate genes, and the related candidate genes jointly affect the appearance of ADHD clinical symptom... [ABSTRACT FROM AUTHOR]

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Objective To evaluate the effect of glandular involvement and persistent human papillomavirus (HPV) infection upon the recurrence of high-grade squamous intraepithelial lesion (HSIL) of the cervix, aiming to provide evidence for postoperative clinical management. Methods Clinical data of 596 HSIL patients who underwent cold-knife conization were collected, including 240 cases of glandular involvement (glandular involvement group) and 356 cases of non-glandular involvement (nonglandular involvement group). The recurrence of HSIL at postoperative 2 years was considered as the end point. The differences between recurrent and non-recurrent patients were compared. According to glandular involvement and HPV-16 infection, patients were divided into the glandular involvement+ HPV-16 infection, glandular involvement alone, HPV-16 infection alone and non-glandular involvement+non-HPV-16 infection groups, respectively. The differences in the recurrence rate of HSIL were compared among four groups. Results Among 596 HSIL patients, 75 cases recurred (12.6%). HPV-16 infection rate in the glandular involvement group was 67.9%, significantly higher than 23.0% in the non-glandular involvement group, and the difference was statistically significant (P < 0.05). In univariate analysis, the proportion of~45 years old, glandular involvement and persistent HPV-16 infection were not significantly correlated with the recurrence of HSIL (all P > 0.05). The recurrence rates of HSIL were 33.8%, 10.9%, 8.5% and 9.7% in the glandular involvement+HPV-16 infection, glandular involvement alone, HPV-16 infection alone and non-glandular involvement+non-HPV-16 infection groups, respectively. The recurrence rate of HSIL in patients with glandular involvement+HPV-16 infection was significantly higher than that in other three groups, and the difference was statistically significant (all P < 0.017). Conclusions HSIL patients with glandular involvement and persistent HPV-16 infection are prone to relapse after cervical cold-knife conization. For these patients, active surgical regimen should be adopted and postoperative follow-up should be strengthened. [ABSTRACT FROM AUTHOR]

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In order to explore approaches of isolating new endophytic bacteria in rice and obtain novel bacterial resources in rice, 3 aspects of material surface sterilization, preparing bacterial suspension, and the formulation of cultural medium were explored while using seeds and seedlings of three rice varieties as materials. The representative pure isolates were identified based on the sequence of the 16S rRNA gene. The results indicated that promising surface sterilization could be achieved by treating seeds with 75% ethanol for 90 s plus NaClO solution (containing 2% available chlorine) for 12 min, or by treating plant tissues with 75% ethanol for 90 s plus NaClO solution for 5 min. In rice seeds, the amount of endophytic bacteria was up to 105 -106 CFU per gram, of which 90%-95% were harbored in glumes, and the bacterial community varied according to varieties and localities of growth. The grinding degree should be considered during the preparation of bacterial suspension so as to obtain colonies as diverse as possible, and stripping off glumes was beneficial to isolating species distributed mainly in the brown rice. for the separation of endophytic bacteria in rice root, stem and leave, it was necessary to control the concentration of bacterial suspension according to the material characteristics so as to obtain the trace species harbored inside. The isolation and culture of some endophytic bacteria in rice root, stem and leave could be facilitated by adding tissue extract to the culture medium and by prolonging the cultivation time to over two weeks. Using the modified protocol, we separated and cultivated the endophytic bacteria in seeds as well as roots, stems and leaves of three rice varieties, and identified 71, 14, 10 and 2 pure isolates respectively, by 16S rRNA gene sequencing. A total of 8 isolates, accounting for 8.25% of the total identified isolates, showed a similarity of 97.22%-98.74% to the model strains recorded in the Ezbiocloud database and were putative new species. The results of our study may provide a referenced method to isolate and cultivate new resources of endophytic bacteria in rice. [ABSTRACT FROM AUTHOR]

Aiming at the situation that the single shot multibox detector(SSD) target detection algorithm is prone to miss detection and wrong detection when detecting small targets on the road when applied to the field of autonomous driving, an improved SSD target detection algorithm was proposed. Firstly, the receptive field enhancement module was embedded in the backbone network of the SSD model to expand the receptive field of the feature layer to obtain more feature information of small targets. Secondly, four U-shaped feature extraction structures were added after the backbone network to construct four feature pyramids of different levels. Finally, a multi-level feature pyramid was merged for detection. The results show that the improved SSD model improves the detection accuracy by 6% on the KITTI dataset compared with the original SSD model, and the detection speed reaches 27.9 frame/ s. While taking into account the detection efficiency, it effectively improves the detection accuracy of small targets on the road and is more applicable to the field of autonomous driving. [ABSTRACT FROM AUTHOR]

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