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在新常态经营形势下，用电量的精细化预测对于电力系统的安全、稳定、经济运行具有重要意义。采用基于数据驱动与误差修正的递进式思路，研究行业用电量主要影响因素辨识与预测方法。首先，在数据驱动层面，从相关度和冗余度角度应用最大信息系数和最大关联-最小冗余性初步识别主要影响因素。其次，在误差驱动层面，采用随机森林方法考虑误差进行影响因素精筛。再次，构建考虑了递进式主要影响因素辨识的行业用电量预测模型。预测模型应用自组织映射方法对典型行业的细分行业用电数据样本集进行聚类，分类应用递进式影响因素辨识方法获得主要影响因素，然后同历史用电量数据一起构造误差反向传播神经网络模型进行预测，通过细分聚类、预测求和的方式获得典型行业用电量预测结果。最后，以中国北方某区域两个典型工业行业用电量为预测对象，通过算例验证该方法的适用性。

“双碳”目标下，中国电力系统将呈现“双高”特点，供需平衡面临新的挑战，亟需更加精确的电力负荷预测方法。为此，提出了一种将负荷数据图像化，并应用长短期记忆（long short-term memory，LSTM）人工神经网络进行短期电力负荷预测的方法。首先，研究图像化的负荷数据表达方法，包括时序负荷曲线转换为RGB（红绿蓝三原色）格式图片及其逆过程。其次，将图像化的时序负荷数据作为LSTM的输入进行预测。最后，将预测图片进行时序曲线转化得到最终的短期负荷预测结果。此方法在丰富了负荷数据表达方式的同时，还凸显了LSTM方法在图像分析和处理上的优势。实验结果表明，该方法在一定程度上提高了短期负荷预测的精度，满足实际工程需求。

在钢管柱柱壁和内置H形钢翼缘上设置带有螺纹的螺栓孔,来替代传统梁柱端板连接中高强螺栓的螺母。将高强螺栓直接拧紧在螺纹孔上,可实现钢管柱-钢梁节点的单边连接,简化安装过程。采用有限元方法研究了带有内置H形钢的螺纹锚固单边螺栓端板连接钢管柱-钢梁节点的破坏模式和承载力,并分析了钢管柱柱壁厚度、内置加强H形钢翼缘厚度和高强螺栓直径对节点受力性能的影响。分析结果表明:内置H形钢翼缘板上螺栓孔内的螺纹增大了螺栓孔对高强螺栓的锚固,有效地避免节点发生螺栓拔出破坏;当螺纹所在钢板的厚度大于螺栓直径时,螺纹孔对高强螺栓能提供足够的锚固力,避免发生螺栓拔出破坏;节点破坏模式主要为钢梁端板破坏和高强螺栓破坏。

采用有限元方法研究了火灾下螺栓连接蜂窝梁的屈曲性能,并与传统焊接蜂窝梁进行了比较,分析了不同连接方式对蜂窝梁孔间腹板的屈曲模式和屈曲温度的影响。除焊接连接蜂窝梁外,还对上、下两T形部分采用螺栓搭接连接、借助单侧拼接板对接连接和借助双侧拼接板对接连接的蜂窝梁进行了研究。对焊接连接蜂窝梁和螺栓连接蜂窝梁,均假设腹板孔间温度均匀分布。分析结果表明:在相同截面尺寸情况下,螺栓连接蜂窝梁几乎具有与传统焊接蜂窝梁相同的抗火性能;借助单侧拼接板和借助双侧拼接板对接连接的蜂窝梁的屈曲温度略大于传统焊接蜂窝梁的屈曲温度;而采用螺栓搭接连接蜂窝梁孔间腹板的屈曲温度稍低于焊接连接蜂窝梁的屈曲温度。

对螺栓连接蜂窝梁和传统焊接连接蜂窝梁孔间腹板屈曲性能进行了有限元分析,研究了不同连接方式对蜂窝梁孔间腹板的屈曲模式和屈曲承载力的影响。蜂窝梁上、下两部分的连接方式包括焊接、螺栓搭接连接、借助单侧拼接板对接和借助双侧拼接板对接等。结果表明,在相同截面尺寸、相同孔径的情况下,螺栓连接蜂窝梁具有与传统焊接蜂窝梁相同的受力性能;除借助单侧拼接板对接的蜂窝梁发生孔间腹板局部压屈与费氏剪力塑性铰耦合破坏外,其它连接方式的蜂窝梁均发生孔间腹板屈曲破坏;不同的连接方式对蜂窝梁的屈曲承载力影响较小,但对其跨中挠度影响较大。

分析对比了圆角多边形孔蜂窝梁孔间腹板屈曲承载力的不同计算理论,包括楔体理论模型、英国钢结构协会计算手册理论模型、LAWSON理论模型及斜压柱模型等。采用不同理论对蜂窝梁孔间腹板的屈曲承载力进行了计算,并与试验结果进行了对比。结果表明,应用于六边形孔的楔体理论计算值过于保守,与试验值偏差均超过50%;应用于圆形孔的英国钢结构协会计算手册理论模型及LAWSON理论模型计算值也过于保守,偏差范围在58%70%之间;斜压柱理论相比其它方法,计算结果较为准确,偏差范围在7.6%39%之间。并采用验证的有限元方法分析了不同孔距、孔高及腹板厚度的蜂窝梁孔间腹板的屈曲承载力。应用斜压柱理论模型计算孔间腹板剪力承载力,与有限元参数分析结果对比表明,斜压柱模型按规范BS 5950-1:2000计算的理论值过于保守,理论值与有限元结果比值范围在0.1850.384之间;按规范EN 1993-1-1计算的理论值评价孔距较小(S/d0=1.4)蜂窝梁的剪力承载力时偏于安全,理论值与有限元结果比值范围在0.8780.972之间,当孔距较大(S/d0>1.4)时,理论结果偏于不安全,理论值与有限元结果比值范围在1.0541.818之间,需要进一步修正。

利用有限元方法,对薄壁异形截面铝合金轴心受压柱在火灾不同温度下的破坏模态和屈曲承载力进行了研究。有限元模型通过试验进行验证,并采用稳态分析的方法考虑火灾高温的影响。研究了火灾高温对该类截面柱破坏模态的影响,证实火灾高温会降低柱的屈曲承载力,但不会改变柱的破坏模态。利用有限元方法分析了不同长细比的铝合金柱在不同温度下的屈曲承载力,并将有限元结果与根据欧洲规范EN1999-1-2的计算结果进行对比。结果表明,该规范的设计方法不能准确计算薄壁异形截面铝合金轴压柱的抗火承载力。在有限元分析的基础上提出了针对薄壁异形截面柱高温下承载力的修正公式。

薄壁异形截面铝合金构件广泛应用于建筑结构中,但其截面的复杂性导致该类构件的破坏模态更加复杂。有限元模型采用有限元软件ABAQUS建立并经过试验结果验证。通过有限元方法,分析了薄壁异形截面铝合金柱的塑性屈服、局部屈曲与塑性屈服耦合、局部屈曲与整体屈曲耦合、以及整体屈曲等4种破坏模式的构件变形和截面应力发展。将有限元方法计算的薄壁异形截面铝合金轴压柱极限承载力,与国内外铝合金结构设计规范的计算结果进行了对比。结果表明,现行规范的设计方法在计算薄壁异形截面铝合金轴压柱的承载力时都较为保守。

通过有限元方法研究火灾下无防火保护蜂窝钢梁孔间腹板屈曲性能及屈曲温度。首先采用有限元传热分析,获得标准火灾下无防火保护蜂窝梁不同受火时刻的三维有限元温度分析结果,然后采用有限元受力分析确定三维有限元温度分析结果下蜂窝梁孔间腹板的受力性能和屈曲温度。传热分布结果表明,开孔后增加了孔洞周边厚度方向上腹板与空气间的热量交换,使得腹板升温速率明显大于翼缘。火灾下结构受力分析结果表明,由于钢材的力学性能随温度升高而降低,而且中心腹板升温速率快使蜂窝梁更易发生孔间腹板屈曲破坏。蜂窝梁的屈曲温度随孔间距及腹板厚度的增大而增大。通过对采用三维有限元温度分布与均匀温度分布的蜂窝梁进行对比分析,结果表明,由于不均匀温度分布使得沿腹板高度产生附加热应力,从而使得孔间腹板屈曲变形增大。

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Objective To explore the risk factors of post-traumatic epilepsy(PTE)in children with mild and medium traumatic brain injury(TBI), and to provide reference for clinical prevention and treatment of PTE. Methods The clinical data of 259 children with mild and medium craniocerebral injuries who were admitted to the Department of Neurosurgery, 416 Hospital, the Second Affiliated Hospital of Chengdu Medical College, from January 1, 2015 to January 1, 2023 were analyzed retrospectively. 259 children were classified into PTE group(52)and non-PTE group(207)based on hospitalization and diagnosis of epilepsy within 6 months of discharge. Univariate analysis and multivariate logistic regression were used to analyze the risk factors of PTE after mild and medium TBI in children. Results The results of univariate analysis showed that there were statistically significant differences between PTE and non-PTE groups in the categories of brain injury indicated by magnetic resonance imaging(MRI)showed hemosiderin deposition, emergency computer tomography(CT), abnormal categories of electroencephalogram(EEG), interleukin(IL)-1, IL-6, IL-8 and fibrinogen elevated levels(P＜0. 05). Multivariate logistic regression analysis showed that emergency CT showed traumatic subarachnoid hemorrhage, MRI showed hemositin deposition, EEG showed decreased or disappeared sleep spindles, and elevated IL-8 were independent risk factors for PTE in children with mild and moderate head injury(P＜0. 05). Conclusions Emergency CT shows traumatic subarachnoid hemorrhage. MRI shows hemosiderin deposition. EEG shows decreased or disappeared sleep spindles, and elevates IL-8 are independent risk factors for PTE after mild and moderate TBI in children. The incidence of PTE can be reduced by taking relevant prevention and treatment measures for mild and medium TBI children with the above risk factors. [ABSTRACT FROM AUTHOR]

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To compare and analyze the nutritional value and quality changes of the meat of M. rosenbergii produced by the Eriocheir sinensis and M. rosenbergii mixed culture mode and the traditional M. rosenbergii exclusive culture mode, the body mass, length and meat yield were measured to compare the the differences in body size of M. rosenbergii under two culture modes; moisture, protein, ash, fat, minerals, fatty acids and amino acids were measured to compare the nutritional value; and texture feature and tasty nucleotides were measured to compare the changes of shrimp meat quality. Compared with the exclusively cultured M. rosenbergii, the specification of M. rosenbergii in the mixed culture mode increased significantly, but its meat yield decreased. The fat content of shrimp meat in mixed culture decreased from （0. 91±0. 07）% to （0. 59± 0. 05）%, with a significant difference; The contents of calcium, magnesium phosphorous and cuprum in shrimp meat increased; the EPA content in fatty acids decreased from （ 15. 59±0. 66）% to（ 13. 64±0. 71）%; the EAAI score of amino acids increased slightly; the nutritional value of M. rosenbergii changed slightly; the hardness of shrimp meat in mixed culture increased significantly; and the content of AMP and IMP in tasty nucleotides increased from （78. 15±1. 23） g/100 g and （162. 90±2. 67） g/100 g to （86. 96±1. 87） g/100 g and （175. 12±3. 01） g/100 g. The quality of shrimp meat in mixed culture was significantly improved. The specification of M. rosenbergii produced by the Eriocheir sinensis and M. rosenbergii mixed culture mode significantly increased, with little change in nutritional composition, and the quality of shrimp meat significantly improved, which is in line with consumer taste and has excellent market prospects. [ABSTRACT FROM AUTHOR]

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报道1例在上海瑞金医院全科医学科诊治的2型糖尿病（T2DM）患者, 经预混胰岛素治 疗联合口服降糖药血糖控制不佳, 转换为德谷门冬双胰岛素治疗取得了良好效果的诊疗过程。患者 为68岁男性, 主因"发现血糖升高13年, 双足麻木6个月"入院。入院后完善各项检查, 患者体重指数 （BMI）27.4 kg/m2。空腹血糖（FPG）8.3 mmol/L, 餐后2 h 血糖（2hPG）11.6 mmol/L, 糖化血红蛋白 （HbA1c）7.9%, 高血压病史9年, 平时服用硝苯地平30 mg（1次/d）。诊断为T2DM伴血糖控制不佳, 糖 尿病性周围神经病变, 高血压2级（极高危）。门诊给予精蛋白重组人胰岛素30R早餐前18 U、晚餐前 14 U皮下注射, 联合二甲双胍1.0 g（2次/d）、西格列汀100 mg（1次/d）口服治疗, 血糖控制欠佳。停用 精蛋白重组人胰岛素30R, 改为德谷门冬双胰岛素早餐前18 U、晚餐前14 U, 继续原来的口服降糖药 治疗。患者血糖逐渐控制平稳, FPG维持在5.7~6.2 mmol/L, 2hPG维持在8.1~9.4 mmol/L, 患者出院。 出院后1个月随访, 患者德谷门冬双胰岛素剂量减少至早餐前16 U、晚餐前12 U, 血糖仍旧平稳, 无低 血糖和明显胃肠道不良反应. [ABSTRACT FROM AUTHOR]

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Copyright of Journal of Drainage & Irrigation Machinery Engineering / Paiguan Jixie Gongcheng Xuebao is the property of Editorial Department of Drainage & Irrigation Machinery Engineering 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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Copyright of Journal of Kunming Medical University / Kunming Yike Daxue Xuebao is the property of Kunming Medical Journal 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.)

In order to ensure the measurement accuracy of ion trap mass spectrometer, it is necessary to perform mass calibration on the instrument when there is a mass shift. Mass calibration can be achieved by improving the stability of the electrical components or upgrading the hardware with significant technical costs. Compared with hardware optimization. mass calibration based on software algorithms can better utilize the performance of existing instruments. Mass calibration can be achieved by manually inputting standard samples or calibration solution parameters. However, mass axis calibration in this way still requires setting specific segmentation points based on the actual situation and manually adjusting them to achieve the desired accuracy. Therefore, to improve the low efficiency with manual segmentation during mass calibration, an automatic segmented calibration algorithm was proposed to improve the calibration accuracy and facilitate rapid operation. The algorithm used point by point fitting to deter- mine whether the segment interval met the requirements and also determined each segment interval. At the same time, the mass axis was automatically segmented to reduce the mass deviation of each checkpoint. This method was compared with traditional method, different deviation thresholds were explored, and multiple instruments were selected to verify this method. The results showed that the algorithm can reasonably segment the mass axis and establish a new linear relationship between electrical parameters and m/z under existing conditions, allowing the deviation of each checkpoint to be controlled within a lower preset range (±0.1 u), thus improving the instrument's calibration efficiency and measurement accuracy. reducing the difficulty of personnel operation. The significance of this study is that the algorithm only adjusts and optimizes the signals generated by the hardware without changing the structure of the instrument itself, which is helpful for improving the overall performance and stability of the instrument. Moreover, the principle and conclusion of the algorithm are independent of the experimental platform. so it can be applied to a variety of other types of mass spectrometers. For the insufficient points. firstly, the upper limit of accuracy provided by the algorithm itself is still determined by the hardware accuracy of the instrument, so it is only possible to calibrate and optimize the mass axis within a certain accuracy range. Secondly, because the calibration process requires a certain number of reference points. which poses certain requirements for the selection of calibration solutions. [ABSTRACT FROM AUTHOR]

Objective: To develop the Multi-dimensional Synthetic Drug Abuser Scale (MSDAS) for synthetic drug addicts and test its validity and reliability. Methods: The semi-structured interviews were conducted with 56 synthetic drug addicts, and the initial scale was formed through literature analysis and expert interviews. The initial vision was delivered to 520 drug addicts for item analysis and exploratory factor analysis, and totally 3517 drug addicts were recruited for validation factor analysis, calibration validity and internal consistency reliability tests, 227 drug users were selected for retesting at 4-week intervals. The Symptom Check-List 90 (SCL-90), Quality of Life of Drug Addicts Scale (QOL-DA) and Obsessive-Compulsive Drug Use Scale (OCDUS) were used to test the criterion validity. Results: The 121-item MSDAS contained four physical, general psychological, addiction psychological and social dimensions (13 factors in total), and the factor models for each dimension fitted well (x² = 1348.09, df = 570, RMSEA =0.08, SRMR = 0.05, GFI = 0.97, CFI = 0.96, TLI=0.95). Criterion validity test showed that the scores of the factors corresponding to MSDAS were all positively correlated with the scores of SCL-90, QOL-DA and OCDUS (ICC = 0.48 -0.86, Ps <0.05). The Cronbach coefficients for 13 factors and 4 dimensions were ranged from 0.65 to 0.93, and 0.71 0.96 for retest reliabilities. Conclusion: The Multi-dimensional Synthetic Drug Abuser Scale (MSDAS) in this study has good validity and reliability. [ABSTRACT FROM AUTHOR]

Copyright of Shandong Medical Journal is the property of Shandong Medical Health Newspapers 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 Materials Engineering / Cailiao Gongcheng is the property of Journal of Materials Engineering 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 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.)