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基于地质雷达技术的新建项目施工对相邻道路影响评估的应用研究

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工程质量 2024年第7期42卷 102-105页

作者：刘金龙吴一帆王学涛袁小军江苏省建筑工程质量检测中心有限公司江苏南京210033 江苏省建筑科学研究院有限公司江苏南京210000 山东省城建设计院山东济南250021

论文将地质雷达技术引入到新建项目施工对相邻道路影响的评估中,通过对比施工前、施工过程中及施工结束后相同位置处的雷达图像,可有效对受影响道路进行评估,对于由新建项目施工引起的道路安全隐患起到快速排查作用,从源头上解决此类问... 详细信息

论文将地质雷达技术引入到新建项目施工对相邻道路影响的评估中,通过对比施工前、施工过程中及施工结束后相同位置处的雷达图像,可有效对受影响道路进行评估,对于由新建项目施工引起的道路安全隐患起到快速排查作用,从源头上解决此类问题。通过对相邻施工影响的典型雷达图像分析、归纳形成典型图像数据库,可有效识别、防范由相邻施工影响引起的安全隐患。该方法的普遍应用对分析新建项目施工对相邻道路的影响提供了一个好的解决方法。

关键词：地质雷达项目施工道路影响应用研究

微波消融与射频消融治疗中小肝脏恶性肿瘤临床疗效的Meta分析

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癌症进展 2024年第3期22卷 318-322,343页

作者：苗苗王海静贾巴见明陈强罗琳原小军内蒙古科技大学包头医学院研究生院内蒙古包头014010 内蒙古科技大学包头医学院第一附属医院医学影像科内蒙古包头0140100

目的通过Meta分析比较射频消融(RFA)及微波消融(MWA)治疗中小肝脏恶性肿瘤的疗效及安全性。方法检索2012年1月至2022年1月在中英文主要数据库发表的关于MWA及RFA治疗中小肝脏恶性肿瘤的随机对照试验(RCT)。对比MWA及RFA治疗肝脏恶性肿... 详细信息

目的通过Meta分析比较射频消融(RFA)及微波消融(MWA)治疗中小肝脏恶性肿瘤的疗效及安全性。方法检索2012年1月至2022年1月在中英文主要数据库发表的关于MWA及RFA治疗中小肝脏恶性肿瘤的随机对照试验(RCT)。对比MWA及RFA治疗肝脏恶性肿瘤的完全消融率(CA)、主要并发症发生率、无复发生存率(RFS)、总生存率(OS)、局部复发率(LTP)、肝内远处转移率(IDR)、消融时间和手术时间。采用STATA15.0软件进行统计分析并绘制森林图。结果共纳入10项RCT,进行MWA及RFA治疗的患者分别为468、517例。RFA组及MWA组的CA分别为91.8%、93.1%,两组比较,差异无统计学意义[优势比(OR)=0.87,95%CI:0.53~1.42,P﹥0.05]。RFA组平均消融时间为17.3 min,MWA组平均消融时间为11.1 min,MWA组平均消融时间短于RFA组[加权均数差(WMD)=6.47,95%CI:4.40~8.54,P﹤0.05]。两组患者其余次要结局指标如OS、LTP、IDR、手术时间、主要并发症发生率和1年RFS比较,差异均无统计学意义(P﹥0.05)。结论对于﹤5 cm的肝脏恶性肿瘤,MWA与RFA治疗效果相似,MWA仅在消融时间方面存在优势。

关键词：微波消融射频消融肝脏恶性肿瘤 Meta分析

石墨化温度对质子交换膜燃料电池用碳纸性能的影响

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化工新型材料 2024年第6期52卷 94-97,107页

作者：袁晓君王虹刘江涛李荣年冯勇孙其忠田合鑫林献浙江鹏辰造纸研究所有限公司杭州311202 贵州梅岭电源有限公司遵义563099 龙游鹏辰新材料科技有限公司衢州324499

以聚丙烯腈碳纤维和聚乙烯醇为原料,将湿法造纸抄造的碳纸原纸用酚醛树脂浸渍热压固化后进行碳化石墨化,制备了石墨化温度不同的燃料电池用碳纸样品,分析了碳纸的拉伸强度、透气性、水平电阻率等性能指标,并通过X射线衍射仪分析了石墨... 详细信息

以聚丙烯腈碳纤维和聚乙烯醇为原料,将湿法造纸抄造的碳纸原纸用酚醛树脂浸渍热压固化后进行碳化石墨化,制备了石墨化温度不同的燃料电池用碳纸样品,分析了碳纸的拉伸强度、透气性、水平电阻率等性能指标,并通过X射线衍射仪分析了石墨化温度不同的碳纸样品的石墨结构,探究了石墨化温度对燃料电池用碳纸性能的影响,确定了实验条件下碳纸性能较优且成本较低的最佳石墨化温度。实验结果表明:在2000~2800℃阶段,2400℃条件下制备的碳纸综合性能最佳,比2800℃制备的碳纸可节省电力能源;石墨化温度为2400℃时,碳纸的拉伸强度为22.9MPa、水平电阻率为3.935mΩ·cm、石墨化度为68.68%。

关键词：碳纸石墨化聚丙烯腈碳纤维质子交换膜燃料电池

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连铸输送辊道水冷轴承座损坏原因分析

冶金设备管理与维修 2024年第4期42卷 61-62页

作者：袁晓军吴亚锋茅海敏赵君军蓬晓炜江苏沙钢钢铁有限公司江苏苏州215625

分析了连铸输送辊道轴承座轴承损坏的原因,提出了水冷系统、自动控制系统改进措施。改进后,轴承用量减少90%,年节约维修费用约10万元。

关键词：连铸轴承座喷嘴

Markovian Cascaded Channel Estimation for RIS Aided Massive MIMO Using 1⁃Bit ADCs and Oversampling

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ZTE Communications 2022年第1期20卷 48-56页

作者： SHAO Zhichao YAN Wenjing yuan xiaojun National Key Laboratory of Science and Technology on Communica-tions University of Electronic Science and Technology of ChinaChengdu 611731China

A reconfigurable intelligent surface(RIS)aided massive multiple-input multiple-output(MIMO)system is considered,where the base station employs a large antenna array with low-cost and low-power 1-bit analog-to-digital converters(ADCs).To compensate for the per-formance loss caused by the coarse quantization,oversampling is applied at the *** main challenge for the acquisition of cascaded channel state information in such a system is to handle the distortion caused by the 1-bit quantization and the sample correlation caused by *** this work,Bussgang decomposition is applied to deal with the coarse quantization,and a Markov chain is developed to char-acterize the banded structure of the oversampling *** approximate message-passing based algorithm is proposed for the estimation of the cascaded *** results demonstrate that our proposed 1-bit systems with oversampling can approach the 2-bit systems in terms of the mean square error performance while the former consumes much less power at the receiver.

关键词： massive MIMO reconfigurable intelligent surface channel estimation 1-bit ADCs oversampling

Frontsand strong currents of the upper southeast Indian Ocean

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Acta Oceanologica Sinica 2006年第2期25卷 1-24页

作者： HE Zhigang DONG Zhaoqian yuan xiaojun Department of Oceanography Xiamen University Xiamen 361005 China Polar Research Institute of China Shanghai 200136 China Lamont-Doherty Earth Observatory Columbia University Palisades New York NY 10964-800 USA

Hydrographic data, ADCP velocity and sea level anomaly derived from the satellite altimeter have been jointly analyzed in the southeast lndian Ocean. Results show the locations and orientations of the major oceanic fronts as well as the characteristics of the currents within these fronts in the area. Double subtropical fronts are observed in the section along 120°E, which conflicts with the frontal structure frequently observed before the North Subtropical Front （NSTF） and South Subtropical Front （SSTF） merge into a single STF between 110°-115°E. The Subantarctic Front （SAF）, influenced by the out-of-phase double eddies, runs across 48°S three times between 120° and 127°E. The surface current within the SAF is strengthened up to 105.4 cm/s by the geostrophic effect of these eddies. Furthermore eddies may cause the strong current to split up into two branches within the SAF. The SAF and the primary polar front （PFI） can be identified individually in the ADCP data with a separation distance of about 0.3° at latitude between 140° and 145°E, although they cannot be identified separately in the low-resolution hydrographic data. The different thcrmohaline characteristics of Circumpolar Deep Water （CDW） and Modified Circumpolar Deep Water （MCDW） result in the formation of Southern Antarctic Circumpolar Current Front （SACCF） in the southeast Indian Ocean. It consistently turns northward along the east flank of the Kerguclen Plateau after it runs through the Princess Elizabeth Trough and turns southward sharply north of 60°S with a little seasonal variations. It is shown that the locations and orientations of the SAK the primary PF and SACCF in the ACC of the southeast Indian Ocean can be identified more precisely by the current distribution derived from ADCP data than by hydrographic data, because these fronts are usually accompanied by strong currents. However, the locations and orientations of the STF and the secondary PF are more difficult to be identified through cur

关键词： southeast Indian Ocean front jet

RIS-Aided Constant-Envelope Beamforming for Multiuser Wireless Power Transfer:A Max-Min Approach

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China Communications 2021年第3期18卷 80-90页

作者： Huiyuan Yang Chang Cai xiaojun yuan Yingchang Liang Center for Intelligent Networking and Communications University of Electronic Science and Technology of ChinaChengdu 611731China

As a revolutionary hardware technology that can reconfigure the propagation environment,reconfigurable intelligent surfaces(RISs)have been regarded as a promising solution to enhance wireless *** this paper,we consider a multiuser multiple-input single-output(MISO)wireless power transfer(WPT)system,which is assisted by several *** order to improve energy efficiency and reduce hardware cost,we consider that the energy transmitter(ET)in the WPT system is equipped with a constant-envelope analog beamformer,instead of a digital *** on user fairness,we study a minimum received power maximization problem by jointly optimizing the ET beamforming and the RIS phase shifts,subject to the constant-envelope *** iteratively solve this non-convex maxmin problem by leveraging both the successive convex approximation(SCA)method and the alternating direction method of multipliers(ADMM)*** results demonstrate the effectiveness of the proposed algorithm and show attractive performance gain brought by RISs.

关键词： reconfigurable intelligent surface wireless power transfer max-min fairness constantenvelope beamforming

Total flavonoids of Astragalus membranaceus protect against 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine-induced neurotoxicity in mice by inhibiting ferroptosis through SLC7A11/GPX-4 signaling pathway

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Food Science and Human Wellness 2024年第1期13卷 414-420页

作者： Zitian Gao Gaorui Wang Yujie Chen Wuke yuan Jun Cai Aiping Feng Jie Fang Qi Xu xiaojun Wu School of Public Health Shanghai University of Traditional Chinese MedicineShanghai 201203China Shanghai Key Laboratory of Compound Chinese Medicines The Ministry of Education(MOE)Key Laboratory for Standardization of Chinese MedicineInstitute of Chinese Materia MedicaShanghai University of Traditional Chinese MedicineShanghai 201203China Longhua Hospital affiliated to Shanghai University of Traditional Chinese Medicine Shanghai University of Traditional Chinese MedicineShanghai 201203China

Parkinson’s disease(PD)is a common neurodegenerative disorder with no *** membranaceus is used in Chinese culture as a food supplement to boost *** present study aimed to explore the neuroprotective effects of total flavonoids extracted from ***(TFA)and their protective *** offered neuroprotection against 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine(MPTP)in the mouse model of Parkinsonism,by improving behavior performance in the gait analysis and pole test,and inhibiting the decline of tyrosine hydroxylase(TH)positive neurons and TH protein expression in substantia nigra of *** also prevented 1-methyl-4-phenylpyridinium(MPP+)induced neurotoxicity in SHSY5Y cells,by increasing GSH and GSH/GSSG ratio,and reducing reactive oxygen *** addition,the neuroprotective effects of TFA were associated with its ability to restore MPTP/MPP+induced downregulation of SLC7A11 and glutathione peroxidase 4(GPX-4).In conclusion,we demonstrated that TFA exerted significant neuroprotection against MPTP/MPP+induced neurodegeneration by inhibiting ferroptosis through the regulation of SLC7A11/GPX-4 axis,suggesting the use of TFA as a possible food supplement in the prevention of PD.

关键词： Parkinson’s disease Total fl avonoids of Astragalus membranaceus Ferroptosis SLC7A11

Relationships between blood chromium exposure and liver injury:Exploring the mediating role of systemic inflammation in a chromate-exposed population

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Journal of Environmental Sciences 2024年第9期143卷 224-234页

作者： Zekang Su Yali Zhang Shiyi Hong Qiaojian Zhang Jiayu Xu Guiping Hu xiaojun Zhu Fang yuan Shanfa Yu Tianchen Wang Guang Jia Department of Occupational and Environmental Health Sciences School of Public HealthPeking UniversityBeijing 100191China School of Engineering Medicine and Beijing Advanced Innovation Center for Big Data-Based Precision Medicine Beihang UniversityBeijing 100191China National Center for Occupational Safety and Health Beijing 102308China Department of Occupational Health and Radiological Health Chongqing Centers for Disease Control and PreventionChongqing 400042China Henan Institute for Occupational Medicine Zhengzhou 450052China Department of Clinical Laboratory Third Hospital of Peking UniversityBeijing 100191China

Hexavalent chromium and its compounds are prevalent pollutants,especially in the work environment,pose a significant risk for multisystem toxicity and *** it is known that chromium accumulation in the liver can cause damage,the dose-response relationship between blood chromium(Cr)and liver injury,as well as the possible potential toxic mechanisms involved,remains poorly *** address this,we conducted a follow-up study of 590 visits from 305 participants to investigate the associations of blood Cr with biomarkers for liver injury,including serum alanine aminotransferase(ALT),aspartate aminotransferase(AST),total bilirubin(TBIL),and direct bilirubin(DBIL),and to evaluate the mediating effects of systemic ***(PLT)and the platelet-to-lymphocyte ratio(PLR)were utilized as biomarkers of systemic *** the linear mixed-effects analyses,each 1-unit increase in blood Cr level was associated with estimated effect percentage increases of 0.82%(0.11%,1.53%)in TBIL,1.67%(0.06%,3.28%)in DBIL,0.73%(0.04%,1.43%)in ALT and 2.08%(0.29%,3.87%)in AST,***,PLT mediated 10.04%,11.35%,and 10.77%increases in TBIL,DBIL,and ALT levels induced by chromate,*** addition,PLR mediated 8.26%and 15.58%of the association between blood Cr and TBIL or *** findings shed light on the mechanisms underlying blood Cr-induced liver injury,which is partly due to worsening systemic inflammation.

关键词： Blood chromate Liver injury Systemic inflammation Mediation analysis