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相邻深基坑开挖相互影响及变形控制研究

市政技术 2024年第6期42卷 81-88,98页

作者：陶连金胡国庆焦伯阳郭飞赵旭张宇北京工业大学城市与工程安全减灾省部共建教育部重点实验室北京100124 北京市政建设集团有限责任公司北京100020 北京建筑大学土木与交通工程学院北京102627

以北京城市副中心站综合交通枢纽项目大铁深基坑和02B区深基坑分期开挖为研究对象,采用有限元软件建立了局部精细化模型,对相邻深基坑开挖的变形特性和影响因素进行了研究,并提出了深基坑变形控制措施。研究结果表明,在相邻深基坑近接... 详细信息

以北京城市副中心站综合交通枢纽项目大铁深基坑和02B区深基坑分期开挖为研究对象,采用有限元软件建立了局部精细化模型,对相邻深基坑开挖的变形特性和影响因素进行了研究,并提出了深基坑变形控制措施。研究结果表明,在相邻深基坑近接施工过程中,先开挖的深基坑呈向后开挖深基坑方向移动的趋势,而坑间土地表沉降变形从凹槽形变为双峰形;根据拟合出的变形曲线斜率,可以将相邻深基坑近接施工影响分区划分为:dddd≥6h为无影响区;为了确保深基坑群施工的整体稳定性,最优开挖顺序是同步开挖,如需分步开挖应优先开挖支护结构刚度较大、支护力度较强的深基坑;该工程可通过及时在逆作区架设上斜撑来实现变形控制的目的。

关键词：相邻深基坑同步开挖相互影响变形控制措施

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A Method Based on Knowledge distillation for Fish School Stress State Recognition in Intensive Aquaculture

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Computer Modeling in Engineering & Sciences 2022年第6期131卷 1315-1335页

作者： Siyuan Mei Yingyi Chen Hanxiang Qin Huihui Yu daoliang Li boyang Sun Ling Yang Yeqi Liu College of Information and Electrical Engineering China Agricultural UniversityBeijing100083China National Innovation Center for digital Fishery China Agricultural UniversityBeijing100083China School of Information Science and Technology Beijing Forestry UniversityBeijing100083China

Fish behavior analysis for recognizing stress is very important for fish welfare and production management in *** advances have been made in fish behavior analysis based on deep ***,most existing methods with top performance rely on considerable memory and computational resources,which is impractical in the real-world *** order to overcome the limitations of these methods,a new method based on knowledge distillation is proposed to identify the stress states of fish *** knowledge distillation architecture transfers additional inter-class information via a mixed relative loss function,and it forces a lightweight network(GhostNet)to mimic the soft probabilities output of a well-trained fish stress state recognition network(ResNeXt101).The fish school stress state recognition model’s accuracy is improved from 94.17%to 98.12%benefiting from the *** proposed model has about 5.18 M parameters and requires 0.15 G FLOPs(floating-point operations)to process an image of size 224×***,fish behavior images are collected in a land-based factory,and a dataset is constructed and extended through flip,rotation,and color jitter augmentation *** proposed method is also compared with other state-of-the-art *** experimental results show that the proposed model is more suitable for deployment on resource-constrained devices or real-time applications,and it is conducive for real-time monitoring of fish behavior.

关键词： Fish behavior deep learning knowledge distillation aquaculture

Structured hierarchical Mn–Co mixed oxides supported on silicalite-1 foam catalyst for catalytic combustion

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Chinese Journal of Chemical Engineering 2020年第9期28卷 2319-2327页

作者： Yanan Guan Hengyu Shen Xing Guo boyang Mao Zhenyuan Yang Yangtao Zhou He Liang Xiaolei Fan Yilai Jiao jinsong Zhang Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Science and Technology on Vacuum Technology and Physics Laboratory Lanzhou Institute of PhysicsLanzhou 730010China department of Engineering University of CambridgeJJ Thomson AvenueCambridge CB30FAUnited Kingdom department of Eye and Vision Science Institute of Life Course and Medical SciencesUniversity of Liverpool6 WestDerby StreetLiverpoolL78TXUnited Kingdom department of Chemical Engineering and Analytical Science School of EngineeringThe University of ManchesterOxford RoadManchesterM139PLUnited Kingdom

Silicalite-1(S1)foam was functionalized by supporting manganese-cobalt(Mn-Co)mixed oxides to develop the structured hierarchical catalyst(Mn-Co@SlF)for catalytic combustion for the first *** self-supporting S1 foam with hierarchical porosity was prepared via hydrothermal synthesis with polyurethane(PU)foam as the ***,Mn-Co oxide nano sheets were uniformly grown on the surface of S1 foams under hydrothermal conditions to prepare the structured hierarchical catalyst with specific surface area of 354 m^2·g^-1,micropore volume of 0.141 cm^3·g^-1 and total pore volume of 0.217 cm3·g^-1,as well as a good capacity to adsorb toluene(1.7 mmol·g^-1 at p/p0=0.99).Comparative catalytic combustion of toluene of over developed structured catalyst Mn-Co@SlF was performed against the control catalysts of bulk Mn-Co@S1(i.e.,the crushed Mn-Co@SlF)and unsupported Mn-Co oxides(i.e.,Mn-Co).Mn-Co@SlF exhibited comparatively the best catalytic performance,that is,complete and stable toluene conversion at 2480 C over 65 h due to the synergy between Mn-Co oxides and S1 foam,which provided a large number of oxygen vacancies,high redox *** addition,the hierarchical porous structure also improved the accessibility of active sites and facilitated the global mass transfer across the catalyst bed,being beneficial to the catalysis and catalyst longevity.

关键词： Structured catalyst Silicalite-1 Mn-Co oxides Cellular foam Catalytic combustion

VEGF combined with dAPT promotes tissue regeneration and remodeling in vascular grafts

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Regenerative Biomaterials 2023年第1期10卷 1577-1591页

作者： Tao Yang Guangxu Li Xifeng Li boyang Wei Hengxian Su Wenchao Liu Shenquan Guo Nan Yang Tao Xu Chuanzhi duan Neurosurgery Center Department of Cerebrovascular SurgeryThe National Key Clinical SpecialtyThe Engineering Technology Research Center of Education Ministry of China on Diagnosis and Treatment of Cerebrovascular DiseaseGuangdong Provincial Key Laboratory on Brain Function Repair and RegenerationThe Neurosurgery Institute of Guangdong ProvinceZhujiang HospitalSouthern Medical UniversityGuangzhou 510282China department of Neurosurgery The First Affiliated Hospital of Jinan UniversityGuangzhouGuangdong510630China department of Bio-intelligent Manufacturing and Living Matter Bioprinting Center Research Institute of Tsinghua University in ShenzhenTsinghua UniversityShenzhen 518057People’s Republic of China department of Tsinghua Shenzhen International Graduate School Tsinghua UniversityShenzhen 518055People’s Republic of China

Previous research on tissue-engineered blood vessels(TEBVs)has mainly focused on the intima or adventitia unilaterally,neglecting the equal importance of both ***,the efficacy of grafts modified with vascular endothelial growth factor(VEGF)merely has been ***,we developed a small-diameter graft that can gradually release VEGF andγsecretase inhibitor IX(dAPT)to enhance tissue regeneration and remodeling in both the intima and *** vitro,experiments revealed that the combination of VEGF and dAPT had superior pro-proliferation and pro-migration effects on endothelial *** vivo,the sustained release of VEGF and dAPT from the grafts resulted in improved regeneration and ***,in the intima,faster endothelialization and regeneration of smooth muscle cells led to higher patency rates and better *** the adventitia,a higher density of neovascularization,M2 macrophages and fibroblasts promoted cellular ingrowth and replacement of the implant with autologous ***,western blot analysis confirmed that the regenerated ECs were functional and the effect of dAPT was associated with increased expression of vascular endothelial growth factor receptor *** study demonstrated that the sustained release of VEGF and dAPT from the graft can effectively promote tissue regeneration and remodeling in both the intima and *** development has the potential to significantly accelerate the clinical application of small-diameter TEBVs.

关键词： VEGF Notch graft regeneration remodeling

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中西医治疗溃疡性结肠炎的比较与分析

中华全科医学 2024年第10期22卷 1640-1644,1713页

作者：许博洋杨雯迪李伟贾志春徐伟王嘉婉内蒙古自治区人民医院中西医结合科内蒙古呼和浩特010017 内蒙古自治区监狱管理局第一医院急诊科内蒙古呼和浩特010050

溃疡性结肠炎(ulcerative colitis,UC)作为常见的炎症性肠病(inflammatory bowel disease,IBd),其发病机制目前尚未完全明确。多数学者认为,宿主遗传易感性和异常环境因素引起的宿主免疫与肠道微生物群关系的失衡,促进了UC患者肠道炎症... 详细信息

溃疡性结肠炎(ulcerative colitis,UC)作为常见的炎症性肠病(inflammatory bowel disease,IBd),其发病机制目前尚未完全明确。多数学者认为,宿主遗传易感性和异常环境因素引起的宿主免疫与肠道微生物群关系的失衡,促进了UC患者肠道炎症的发生。在治疗上,西医通常运用氨基水杨酸、激素、免疫调节剂、生物制剂等药物。这些药物主要针对炎症反应和免疫调节发挥直接作用,能在短时间内显著改善症状,尤其在控制急性发作和重症UC方面成效显著。然而,这些药物普遍存在不同程度的副作用,且可能导致患者对药物产生依赖,从而加大停药后病情复发的风险。中医学认为UC是在素体脾胃虚弱的基础上,由于感受外邪、饮食失宜、情志失调等诱因而导致发病。在治疗上,中医在轻症及缓解期UC方面表现出显著的疗效。中医治疗不仅关注疾病本身,还高度重视患者的个体差异。通过辨证论治,为患者制定个性化的治疗方案。此外,中医治疗手段丰富多样,包括口服汤剂、中药灌肠、栓剂纳肛、针灸等。这些治疗方法在缓解症状的同时,有助于改善患者肠道功能、提高生活质量,且副作用较小,疗效持久。本文旨在通过中医病因病机、中医治疗、西医发病机制、西医治疗4个方面比较和分析中西医治疗UC的现状,以探索中西医结合治疗UC的可行性,为该病的诊治提供新思路、新方法。

关键词：溃疡性结肠炎中医治疗西医治疗中西医结合

日粮中添加月桂酸对肥育猪胴体品质和肉品质的影响

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中国畜牧杂志 2024年第2期60卷 257-264页

作者：郭建新万波扬沈铭姜国圆闫恩法王宇波邓磊尹靖东畜禽营养与饲养全国重点实验室中国农业大学动物科学技术学院北京100193 屯昌天之虹生态农牧有限公司海南屯昌571600

试验旨在探究日粮中添加月桂酸对肥育猪胴体性状和肉品质的影响。选取体重为73.74±2.48 kg的杜×长×大三元杂交猪144头,公母各半,根据初始体重按照随机区组原则分为4个处理,每个处理6个重复,每个重复6头猪。对照组(0.00%月桂酸组)饲... 详细信息

试验旨在探究日粮中添加月桂酸对肥育猪胴体性状和肉品质的影响。选取体重为73.74±2.48 kg的杜×长×大三元杂交猪144头,公母各半,根据初始体重按照随机区组原则分为4个处理,每个处理6个重复,每个重复6头猪。对照组(0.00%月桂酸组)饲喂玉米-豆粕型基础日粮,试验组分别饲喂在基础日粮中添加0.25%、0.50%、1.00%月桂酸的试验日粮,月桂酸和豆油进行等能值替换,保证各组日粮总能相等,试验期为34 d。试验结束时,每个处理选取体重接近同性别平均体重的8头阉公猪屠宰,采集组织样品并测定胴体性状和肉品质。结果表明:随着日粮月桂酸水平的升高,肥育猪的末重(PdG)和血清瘦素浓度(P=0.04)线性增加,甘油三酯(TG)水平呈二次升高的趋势(P=0.09),高密度脂蛋白胆固醇(HdL-C)水平呈线性升高的趋势(P=0.08);日粮中月桂酸水平的提高显著改变了肥育猪背最长肌中的脂肪酸组成(P<0.05);肥育猪的活体重、热胴体重、胴体长和腰荐结合处背膘厚也随日粮中月桂酸水平的提高呈线性增加(P<0.01),同样地,背最长肌pH24 h线性升高(P=0.02),L*24 h则线性降低(P=0.01)。总之,日粮中添加月桂酸提高了肥育猪的生长性能,显著改变了肌肉的脂肪酸组成,具有改善肥育猪胴体性状、肉品质以及调节脂质代谢和改善肉风味的潜在作用。

关键词：月桂酸肥育猪胴体品质肉品质

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乘用车车身压铸铝结构件应用现状及连接技术开发应对

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汽车工艺与材料 2024年第7期 9-13页

作者：张华刘博洋张林阳吕颖宋磊高东宏中国第一汽车股份有限公司研发总院长春130013 高端汽车集成与控制全国重点实验室长春130013

一体化压铸铝合金结构件因其具有高集成、轻量化、刚性好等优点,在乘用车车身上的应用逐渐增多,并且正在向大型化发展。压铸结构件大型化的发展对连接技术提出了更大的挑战。阐述了当前乘用车车身压铸铝合金典型应用部位,分析了大型压... 详细信息

一体化压铸铝合金结构件因其具有高集成、轻量化、刚性好等优点,在乘用车车身上的应用逐渐增多,并且正在向大型化发展。压铸结构件大型化的发展对连接技术提出了更大的挑战。阐述了当前乘用车车身压铸铝合金典型应用部位,分析了大型压铸结构件应用面临的难点、困境以及大型化后连接技术方面的应对策略,展望了未来压铸铝结构件的发展趋势以及对连接技术的新要求。

关键词：轻量化车身压铸铝合金连接技术

纯电动汽车锂离子电池低温充电方法对温升速率的影响分析

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汽车文摘 2024年第5期 6-10页

作者：李丽丽夏弋茹杨振何忠青王勃洋中国第一汽车股份有限公司研发总院长春130013

为了解决锂离子电池在寒冷环境中充电能力下降导致充电时间大幅增加的问题,分析了锂离子电池的低温充电方法,并针对纯电动车用锂离子电池在低温下充电方法的差异对电池温升速率的影响展开研究,对改善电池低温充电速率和提升纯电动车低... 详细信息

为了解决锂离子电池在寒冷环境中充电能力下降导致充电时间大幅增加的问题,分析了锂离子电池的低温充电方法,并针对纯电动车用锂离子电池在低温下充电方法的差异对电池温升速率的影响展开研究,对改善电池低温充电速率和提升纯电动车低温充电能力提出建议。

关键词：纯电动汽车低温充电方法电池加热温升速率

Low-degree toroidal modes from the Sumatra-Andaman event observed by superconducting gravimeters

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Geodesy and Geodynamics 2019年第6期10卷 477-484页

作者： Chuang Xu Hangtao Yu Guangyu Jian Shiqi d.ng boyang Zhou Yihao Wu department of Surveying Engineering School of Civil and Transportation EngineeringGuangdong University of TechnologyNo.100 Waihuan Xi RoadGuangzhou 510006China State Key Laboratory of Geodesy and Earth’s dynamics Institute of Geodesy and GeophysicsChinese Academy of SciencesNo.340 Xu Dong AvenueWuhan 430077China State Key Laboratory of Information Engineering in Surveying Mapping and Remote SensingWuhan UniversityWuhan 430079China School of Earth Science and Engineering Hohai UniversityNanjing 210098China

The complex frequencies of the low-degree toroidal modes are helpful in constraining the mantle *** the early years,the traditional method to detect the low-degree toroidal modes is seismic approach,which is primarily limited by the horizontal noise of ***,it has been proved that gravity method is ***,we re-estimated or newly estimated the complex frequencies of the toroidal modes below 1.5 mHz excited by the 2004 Sumatra-Andaman event using gravity method in this *** results show that(1)The quality factors of0 T5-0 T9 and1 T2-1 T3 are estimated from superconducting gravity data for the first time;(2)The estimated frequencies and quality factors for0 T2-0 T9 and1 T2-1 T3 are consistent with those provided by previous publications,which verifies the correctness and effectiveness of our estimations;(3)The maximum difference of frequencies between our results and those from CPREM is on the order of 0.01 mHz and the maximum difference of quality factors is at the level of 10.

关键词： Low-degree toroidal modes Superconducting gravity data Complex frequency Quality factor