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BIM在非标准高处作业吊篮外墙施工中的应用

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建筑技术 2024年第13期55卷 1579-1581页

作者：于光卫李丽丽李建光王丛丛北京市大兴区建设集团有限公司北京102699 河北霞光电力工程集团有限公司河北廊坊065000

亦庄同仁医院(同仁医院南区)配套项目存在工期紧张、建筑集中、局部占地面狭小、高低跨落差大、交叉作业多等问题,基于现场实际条件,采用BIM在酒店外墙保温及涂料施工前对吊篮的屋面布置、全高行程路线进行施工模拟,通过碰撞检测,可直... 详细信息

亦庄同仁医院(同仁医院南区)配套项目存在工期紧张、建筑集中、局部占地面狭小、高低跨落差大、交叉作业多等问题,基于现场实际条件,采用BIM在酒店外墙保温及涂料施工前对吊篮的屋面布置、全高行程路线进行施工模拟,通过碰撞检测,可直观地展示各部件组成及虚拟正确位置,以保证施工质量和安全,提高施工效率,达到节省成本、缩短工期的目的。

关键词：高处作业吊篮非标准建筑信息模型模拟

MDMA及其代谢物MDA在大鼠体内的毒物代谢动力学

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法医学杂志 2024年第1期40卷 37-42页

作者：于维光贺强王铮迪田成俊王锦凯郑茜任飞张潮王优美徐鹏尉志文贠克明山西医科大学法医学院山西晋中030600 法庭毒物分析公安部重点实验室山西晋中030600 阳泉市盂县公安局山西阳泉045000 太原市公安局山西太原030000 公安部禁毒情报技术中心国家毒品实验室北京100193

目的探究单次和连续给药3,4-亚甲基二氧基甲基苯丙胺(3,4-methylenedioxy-N-methylamphetamine,MDMA)后,MDMA及其代谢物4,5-亚甲基二氧基苯丙胺(4,5-methylene dioxy amphetamine,MDA)在大鼠体内的毒物代谢动力学差异,为MDMA的法医学鉴定提供数据依据。方法单次给药组取24只大鼠随机分为5、10、20 mg/kg实验组和对照组,每组6只,实验组腹腔注射给药MDMA,对照组经腹腔注射给药与实验组同等体积的生理盐水。给药后5 min、30 min、1 h、1.5 h、2 h、4 h、6 h、8 h、10 h、12 h通过内眦动脉取血0.5 mL。连续给药组取24只大鼠随机分为实验组(18只)和对照组(6只)。实验组连续腹腔注射递增给药MDMA 7 d,每日给药剂量分别为5、7、9、11、13、15、17 mg/kg,对照组经腹腔注射给药与实验组同等体积的生理盐水。第8天将实验组大鼠随机分为5、10、20 mg/kg剂量组,每组6只,腹腔注射给药MDMA,对照组经腹腔注射与实验组同等体积的生理盐水。给药后5 min、30 min、1 h、1.5 h、2 h、4 h、6 h、8 h、10 h、12 h通过内眦动脉取血0.5 mL。使用液相色谱-三重四极杆串联质谱检测MDMA和MDA含量,运用统计学软件进行数据分析。结果单次给药组血浆中MDMA在给药后5 min达到峰浓度,MDA在给药后1 h达到峰浓度,MDMA和MDA的最长检出时限为12 h。连续给药组第8天MDMA在给药后30 min达到峰浓度,MDA在给药后1.5 h达到峰浓度,MDMA和MDA的最长检出时限为10 h。单次给药组和连续给药组检出时限内MDMA和MDA质量浓度比与给药时间的非线性拟合方程分别为T=10.362C^(-1.183),R^(2)=0.9746;T=7.3973C^(-0.694),R^(2)=0.9615(T为给药时间,C为MDMA和MDA在血浆中的质量浓度比)。结论本研究得到的MDMA及其代谢物MDA在单次和连续给药大鼠体内毒物代谢动力学数据(达峰浓度、达峰时间、检测时限和质量浓度比与给药时间的关系)为相关法医学鉴定提供了理论基础和数据依据。

关键词：法医学毒物化学毒物代谢动力学 3 4-亚甲基二氧基甲基苯丙胺 4 5-亚甲基二氧基苯丙胺模型大鼠

Madecassoside impedes invasion of rheumatoid fibroblast-like synoviocyte from adjuvant arthritis rats via inhibition of NF-κB-mediated matrix metalloproteinase-13 expression

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Chinese Journal of Natural Medicines 2018年第5期16卷 330-338页

作者： yu wei-guang SHEN Yong WU Jian-Zhong GAO Yan-Bing ZHANG Li-Xing Department of Orthopedics Lesion 2 Shijiazhuang No. 1 Hospital Shijiazhuang 050000 China Department of Orthopedics Lesion Spine Third Hospital of Hebei Medical University Shjiazhuang 050000 China

Fibroblast-like synoviocytes(FLS) play a pivotal role in Rheumatoid arthritis(RA) pathogenesis through aggressive migration and invasion. Madecassoside(Madec), a triterpenoid saponin present in Centella asiatica herbs, has a potent anti-inflammatory effect. In the present study, Madec exerted an obvious therapeutic effect in reversing the histological lesions in adjuvant-induced arthritis(AIA) rats. To recognize the anti-rheumatoid potentials of Madec, we further investigated whether Madec interfered with FLS invasion and metalloproteinase(MMP) expression. In cultures of primary FLS isolated from the AIA rats, Madec(10 and 30 μmol·L–1) was proven to considerably inhibit migration and invasion of FLS induced by interleukin 1β(IL-1β), but exhibiting no obvious effect on cell proliferation. Madec repressed IL-1β-triggered FLS invasion by prohibiting the expression of MMP-13. Additionally, Madec suppressed MMP-13 transcription via inhibiting the MMP-13 promoter-binding activity of NF-κB. Our results further showed that Madec down-regulated the translocation and phosphorylation of NF-κB as demonstrated by Western blotting and immunofluorescence assays. In conclusion, our results suggest that Madec exerts anti-RA activity via inhibiting the NF-κB/MMP-13 pathway.

关键词： Rheumatoid arthritis Fibroblast-like synoviocytes Madecassoside Adjuvant-induced arthritis Matrix metalloproteinase-13 Invasion

In situ generated,tetrahydrosalen stabilized yttrium borohydride complex:Efficient initiator for the ring-opening polymerization of ε-caprolactone

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Chinese Chemical Letters 2009年第11期20卷 1357-1360页

作者： Jing Huang Jian Fang yu guang Ming Wu wei Lin Sun Zhi Quan Shen Key Laboratory of Macromolecule Synthesis and Functionalization Ministry of Education Department of Polymer Science and Engineering Zhejiang University Hangzhou 310027 China

In this paper, we report the preparation of a new tertrahydrosalen-stabilized yttrium complex which was employed as an initiator-precursor for the polymerization of ε-caprolactone （ε-CL） in the presence of NaBH4 to give interesting hydroxytelechelic poly（ε-caprolactone）（PCL）. The effect of [monomer]/[initiator] （[CL]/[I]）, temperature and time on the polymerization was investigated. It was found that under the condition： [CL]/[I] = 1200, 55℃, toluene： 0.5 mL, ε-CL： 0.5 mL, PCL with Mw = 32,600 and PDI = 1.47 was obtained.

关键词： Tetrahydrosalen Yttrium complex Ring-opening polymerization ε-Caprolactone

Phase noise sensitivity analysis of lattice constellation

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The Journal of China Universities of Posts and Telecommunications 2010年第2期17卷 36-40页

作者： yu guang-wei NIU Kai HE Zhi-qiang WANG Xu-zhen LIN Jia-ru Key Laboratory of Universal Wireless Communications Ministry of Education Beijing University of Posts and Telecommunications Beijing 100876 China

Based on the assumption of large number of constellation points and high signal-to-noise ratio （SNR）, phase noise sensitivity of lattice constellation is analyzed. The upper bound of symbol error rate （SER） in additive white Gaussian noise （AWGN） channel is derived from pairwise error probability. For small phase noise, phase noise channel is transformed to AWGN channel. With the aid of Wiener model, the obtained upper bound can be extended to phase noise channel. The proposed upper bound can be used as performance criterion to analyze the sensitivity of phase noise in multi-dimensional lattice constellation. Simulation results show that with the same normalized spectral efficiency, higher dimensional lattice constellations are more sensitive than lower ones in phase noise channel. It is also shown that with the same dimension of constellation, larger normalized spectral efficiency means more performance loss in phase noise channel.

关键词： lattice constellation symbol error rate (SER) phase noise

Impact wear properties of dissimilar joints between bainitic frogs and pearlite rails

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Journal of Iron and Steel Research International 2024年第1期31卷 275-287页

作者： Pin-yong Zeng Chun-guang Zuo Xiao-yu Zhang wei Li Tribology Research Institute Southwest Jiaotong UniversityChengdu610031SichuanChina

The impact wear behavior and damage mechanism of dissimilar welded joints between U26Mn frog and U75 V rail before and after normalizing treatment were studied by cyclic impact *** experiment indicated that the impact wear volume of the joints increased with the increasing number of impact *** main wear mechanisms include pitting wear,mild fatigue wear,delamination wear,and fatigue wear,and plastic deformation was the primary impact wear *** them,fatigue wear had the greatest influence on wear volume,while other wear mechanisms had limited *** impact wear resistance of the base material was better than that of the heat-affected *** treatment was beneficial to improving the impact wear resistance of welded joints owing to its effect to promote pearlite recovery,grain refinement,and uniform distribution of *** martensite generated in the rail welded joints aggravated the impact wear damage to the materials,which should be avoided.

关键词： Dissimilar welded joint Impact wear Bainitic steel Damage mechanism Wear rate

Extreme value theory applied to the auroral electrojet indices

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Earth and Planetary Physics 2024年第2期8卷 375-381页

作者： Si Chen Hong yuan Yong wei guang Yang FengZheng yu Aerospace Information Research Institute Chinese Academy of SciencesBeijing 100094China Key Laboratory of Earth and Planetary Physics Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing 100049China

The study of extreme weather and space events has gained paramount importance in modern society owing to rapid advances in high *** and describing exceptional occurrences plays a crucial role in making decisive assessments of their potential impact on technical,economic,and social aspects in various *** research focuses on analyzing the hourly values of the auroral electrojet(AE)geomagnetic index from 1957 to 2019 by using the peak over threshold method in extreme value *** fitting the generalized Pareto distribution to extreme AE values,shape parameter indices were derived,revealing negative values that establish an upper bound for this time ***,it became evident that the AE values had reached a plateau,suggesting that extreme events exceeding the established upper limit are *** a result,although the need for diligent precautions to mitigate the consequences of such extreme events persists,surpassing the upper limit of AE values becomes increasingly *** is also possible to observe an aurora in the middle-and low-latitude regions during the maximum period of the AE index.

关键词： auroral electrojet indices extreme value theory extreme events

Dynamic Crosslinked Phosphorescent Poly(vinyl alcohol)-Terpyridine Films with Enhanced Mechanical Properties and Tunable Shape Memory

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Chinese Journal of Polymer Science 2024年第10期42卷 1595-1601,I0015页

作者： Meng wei wei-Hao Feng Chen yu Zhen-Yi Jiang guang-Qiang Yin wei Lu Tao Chen Key Laboratory of Advanced Marine Materials Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo315201China School of Chemical Sciences University of Chinese Academy of SciencesBeijing100049China School of Materials Science and Chemical Engineering Ningbo UniversityNingbo315211China

Achieving versatile room temperature phosphorescence(RTP)materials,especially with tunable mechanical properties and shape memory is attractive and essential but rarely ***,a strategy was reported to realize multi-functional RTP films with multicolor fluorescence,ultralong afterglow,adjustable mechanical properties,and shape memory through the synergistic dynamic interaction of lanthanide(Ln~Ⅲ)-terpyridine coordination,borate ester bonds,and hydrogen bondings in a poly(vinyl alcohol)(PVA)*** varying the amount of borax,the mechanical properties of the films could be finely controlled due to the change of crosslinking degree of dynamic borate ester bonds in *** assembly and disassembly of borate ester bonds upon the trigger of borax and acid were applied as reversible linkage to achieve programmable shape memory *** addition,the films displayed both fascinating multicolor fluorescence and ultralong afterglow characteristics due to the presence of Ln III doping and confinement of terpyridine in *** study provides a new avenue to impart modulable mechanical strength and shape memory to RTP materials.

关键词： Room temperature phosphorescence materials Dynamic bonds Multicolor fluorescent Tunable mechanical properties Shape memory

Disposal of Waste Plastics With Traditional Coking Process

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Journal of Iron and Steel Research International 2006年第1期13卷 5-9页

作者： CAI Jiu-ju yu guang-wei LIAO Hon-qiang QIAN Kai ZHAO Pen HE Ya-bin State Key Laboratory of Bioindustry Northeastern University Shenyang 110004 Liaoning China Shougang Technical Research Institute Shougang Group Beijing 100041 China

A new technology for treating waste plastics （WP） by traditional coking process was introduced. With a thermo-balance and a 10 g atmospheric fixed bed reactor, the thermo-gravimetric behavior and product were studied during co-coking of WP with blended coal. And then, using a coke-oven with capacity of 200 kg, the characteristics of products were assessed. The results showed that there is an overlapping temperature range （200-550℃ ） of decomposition between WP and blended coal, and the pyrolysis synergism index η and synergism strength β proposed could evaluate the synergism between them. 1% of added WP results in the maximum synergism in all series experiments. The increase of added WP decreases the synergism. Tar yield in co-coking is increased with the decrease of water yield for synergism. Moreover, it was also found that the quality indexes of coke, such as M10, M40, CRI and CSR, are degraded with the increase of WP until 4%, though the quality of tar and gas is optimized for WP addition.

关键词： waste plastics coal coking