检索结果-南通市图书馆

Posterior mediastinal extralobar pulmonary sequestration misdiagnosed as a neurogenic tumor:A case report

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2022年第26期10卷 9340-9347页

作者： Hong-Jie jin yue yu Wei He yun han Department of Thoracic Surgery Shengjing Hospital of China Medical UniversityShenyang 110004Liaoning ProvinceChina

BACKGROUND Pulmonary sequestration-both intralobar and extralobar-is a rare congenital developmental *** pulmonary sequestrations(EPS)have their own pleura but are separated from the bronchus and usually occur in the left *** are mainly found mainly between the lower lobe and the *** is rarely found within the mediastinum itself,even rarer so in the posterior *** SUMMARY We report the case of a 27-year-old man who was misdiagnosed with a neurogenic tumor based on preoperative contrast-enhanced computed tomography(CT)and magnetic resonance imaging ***-enhanced chest CT revealed a posterior mediastinal mass measuring 1.2 cm×1.4 cm×3.3 cm,which consisted of some cystic areas and showed slight *** mass was in the 11th paravertebral region and attached to the 11th thoracic vertebra behind the descending aorta in the posterior *** arteriole originating from the intercostal artery and a vein originating directly from the hemiazygos vein were found in the pedicle of the *** mass was resected in a uniport videoassisted thoracoscopic *** the operation,the pyramid-shaped mass appeared *** histopathology established a diagnosis of *** month later,a follow-up CT of the thorax showed good *** Although EPS rarely occurs in the posterior mediastinum,its diagnosis should be considered when posterior mediastinal tumors are suspected.

关键词： Posterior mediastinal mass Pulmonary sequestration Extralobar pulmonary sequestration Congenital malformation Video-assisted thoracoscopic surgery Case report

Deflagration-to-Detonation Transition Induced by Hot Jets in a Supersonic Premixed Airstream

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 2013年第5期30卷 105-107页

作者： han Xu ZHOU jin LIN Zhi-Yong LIU yu Science and Technology on Scramjet Laboratory National University of Defense TechnologyChangsha 410073

Detonation is initiated through a hot jet in a supersonic premixed mixture of H2 and air,which is produced by using a air *** results show that initiation fails in the low-equivalence-ratio premixed *** the increase of equivalence ratio,the hot jet can induce deflagration to detonation transition(DDT)in the premixed mixture,which an indirect initiation of *** studies show that the DDT process is due to the combined effect of a local hemispherical explosion shock wave,the bow shock,and the flame produced by the hot jet.

关键词： mixed equivalence shock

Response of ocean acidification to atmospheric carbon dioxide removal

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2024年第6期140卷 79-90页

作者： Jiu Jiang Long Cao Xiaoyu jin Zechen yu han Zhang Jianjie Fu Guibin Jiang School of Environment Hangzhou Institute for Advanced StudyUniversity of Chinese Academy of SciencesHangzhou 310024China State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China Key Laboratory of Geoscience Big Data and Deep Resources of Zhejiang Province School of Earth SciencesZhejiang UniversityHangzhou 310058China Zhejiang Climate Center Hangzhou 310052China

Artificial CO_(2)removal from the atmosphere(also referred to as negative CO_(2)emissions)has been proposed as a potential means to counteract anthropogenic climate *** we use an Earth system model to examine the response of ocean acidification to idealized atmospheric CO_(2)removal *** our simulations,atmospheric CO_(2)is assumed to increase at a rate of 1%per year to four times its pre-industrial value and then decreases to the pre-industrial level at a rate of 0.5%,1%,2%per year,*** results show that the annual mean state of surface ocean carbonate chemistry fields including hydrogen ion concentration([H^(+)]),pH and aragonite saturation state respond quickly to removal of atmospheric CO_(2).However,the change of seasonal cycle in carbonate chemistry lags behind the decline in atmospheric CO_(2).When CO_(2)returns to the pre-industrial level,over some parts of the ocean,relative to the pre-industrial state,the seasonal amplitude of carbonate chemistry fields is substantially *** results also show that changes in deep ocean carbonate chemistry substantially lag behind atmospheric CO_(2)*** CO_(2)returns to its pre-industrial value,the whole-ocean acidity measured by[H^(+)]is 15%-18%larger than the pre-industrial level,depending on the rate of CO_(2)*** study demonstrates that even if atmospheric CO_(2)can be lowered in the future as a result of net negative CO_(2)emissions,the recovery of some aspects of ocean acidification would take decades to centuries,which would have important implications for the resilience of marine ecosystems.

关键词： Carbon dioxide removal Net negative CO_(2)emission Ocean acidification Climate change Earth system modeling

Distribution,enrichment mechanism and risk assessment for fluoride in groundwater:a case study of Mihe-Weihe River Basin,China

在线全文

学校读者我要写书评

暂无评论

Frontiers of Environmental Science & Engineering 2023年第6期17卷 63-83页

作者： Xingyue Qu Peihe Zhai Longqing Shi Xingwei Qu Ahmer Bilal jin han Xiaoge yu College of Earth Science and Engineering Shandong University of Science and TechnologyQingdao 266590China College of Safety and Environmental Engineering Shandong University of Science and TechnologyQingdao 266590China College of Computer Science and Engineering Shandong University of Science and TechnologyQingdao 266590China Department of Resource and Civil Engineering Shandong University of Science and TechnologyTai'an 271019China

Due to the unclear distribution characteristics and causes of fluoride in groundwater of Mihe-Weihe River Basin(China),there is a higher risk for the future development and utilization of ***,based on the systematic sampling and analysis,the distribution features and enrichment mechanism for fluoride in groundwater were studied by the graphic method,hydrogeochemical modeling,the proportionality factor between conventional ions and factor *** results show that the fluorine content in groundwater is generally on the high side,with a large area of medium-fluorine water(0.5–1.0 mg/L),and high-fluorine water is chiefly in the interfluvial lowlands and alluvial-marine plain,which mainly contains HCO_(3)·Cl-Na-and HCO_(3)^(-)Na-type *** vertical zonation characteristics of the fluorine content decrease with increasing depth to the water *** high flouride groundwater during the wet season is chiefly controlled by the weathering and dissolution of fluorine-containing minerals,as well as the influence of rock weathering,evaporation and *** weak alkaline environment that is rich in sodium and poor in calcium during the dry season is the main reason for the enrichment of ***,an integrated assessment model is established using rough set theory and an improved matter element extension model,and the level of groundwater pollution caused by fluoride in the Mihe-Weihe River Basin during the wet and dry seasons in the Shandong Peninsula is defined to show the necessity for local management measures to reduce the potential risks caused by groundwater quality.

关键词： Groundwater in the Mihe-Weihe River Basin Distribution characteristics of fluorine Factors influencing fluoride Enrichment mechanism of fluorine Hydrogeochemical modeling Pollution and risk assessment

CSI acquisition in RIS-assisted mobile communication systems

在线全文

学校读者我要写书评

暂无评论

National Science Review 2023年第8期10卷 33-47页

作者： yu han Wankai Tang Xiao Li Michail Matthaiou Shi jin National Mobile Communications Research Laboratory Southeast University Centre for Wireless Innovation(CWI) Queen's University Belfast

Reconfigurable intelligent surface-(RIS) assisted mobile communication is a promising technological paradigm thanks to the attractive advantages of low cost and flexible control of electromagnetic ***, the low-cost features of RISs entail some fundamental challenges to the acquisition of channel state information(CSI), which is essential for the optimal RIS design. To tackle this problem, there have been extensive studies on CSI acquisition in RIS-assisted mobile communication systems, from the perspective of architectural improvement as well as specific mathematical solutions. This article aims to overview the existing works on CSI acquisition in RIS-assisted mobile communication systems.

关键词： channel estimation hybrid RIS implicit CSI RIS

Local resonance metamaterial-based integrated design for suppressing longitudinal and transverse waves in fluid-conveying pipes

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(English Edition) 2024年第10期45卷 1821-1840页

作者： Donghai han Qi JIA yuanyu GAO Qiduo jin Xin FANG Jihong WEN Dianlong yu Laboratory of Science and Technology on Integrated Logistics Support National University of Defense TechnologyChangsha 410073China College of Intelligence Science and Technology National University of Defense TechnologyChangsha 410073China

To solve the problem of low broadband multi-directional vibration control of fluid-conveying pipes,a novel metamaterial periodic structure with multi-directional wide bandgaps is ***,an integrated design method is proposed for the longitudinal and transverse wave control of fluid-conveying pipes,and a novel periodic structure unit model is constructed for vibration *** on the bandgap vibration reduction mechanism of the acoustic metamaterial periodic structure,the material parameters,structural parameters,and the arrangement interval of the periodic structure unit are *** finite element method(FEM)is used to predict the vibration transmission characteristics of the fluid-conveying pipe installed with the vibration reduction periodic ***,the wave/spectrum element method(WSEM)and experimental test are used to verify the calculated results ***,the vibration attenuation characteristics of the structure under different conditions,such as rubber material parameters,mass ring material,and fluid-structure coupling effect,are *** results show that the structure can produce a complete bandgap of 46 Hz-75 Hz in the low-frequency band below 100 Hz,which can effectively suppress the low broadband vibration of the fluidconveying *** addition,a high damping rubber material is used in the design of the periodic structure unit,which realizes the effective suppression of each formant peak of the pipe,and improves the vibration reduction effect of the fluid-conveying ***,the structure has the effect of suppressing both bending vibration and longitudinal vibration,and effectively inhibits the transmission of transverse waves and longitudinal waves in the *** research results provide a reference for the application of acoustic metamaterials in the multi-directional vibration control of fluid-conveying pipes.

关键词： fluid-conveying pipe acoustic metamaterial multi-directional vibration reduction local resonance

Synthesis,Structure and Photochromism of a New Diarylethene and Its Ag(Ⅰ) Complex

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2018年第10期37卷 1663-1672页

作者： han jing han Jia-Cai yu Zhong ZANG Yana jin Bing Department of Materials Physics and Chemistry Xi ＇an University of Technology Xi ＇an 710048 China Department of Applied Chemistry Xi'an University of Technology School of Aeronautics Northwestern Polytechnical University

A new symmetric diarylethene containing cyano group was synthesized and structurally characterized by elemental analysis,IR,1 H NMR and X-ray single-crystal *** belongs to the monoclinic system,space group C2/c with a = 18.848（6）,b = 8.561（2）,c = 16.875（5）？,β = 100.398（6）o,V = 1344.6（11）？~3,Z = 4,μ = 0.262 mm^（-1）,Dc = 1.415 g/cm^3,Mr = 570.56,F（000） = 1160,the final R = 0.0808 and wR = 0.2107 with I 〉 2σ（I）.The two thienyls adopt reactive anti-parallel conformation and the carbon distance of photocyclization is 3.57 ？.The neighboring molecules are stacked closely with C-H…F hydrogen *** addition,the photochromism of the new compound was investigated in solvents with different polarity and PMMA *** alternative photo-irradiation of 254 nm light and ≥550 visible light can induce the reversible photo-cyclization and photo-reversion with the color interconversion between colorlessness and *** THF solution,the λ（max） of diarylethene in PSS in visible band is 585 *** diarylethene further reacted with AgBF4 in benzene to give rise to complex 1,which was structurally characterized by elemental analysis,IR,ESI-MS and TG.1 demonstrated reversible photochromism in both solution and PMMA *** complexation of metal ions with diarylethene leads to a minor red-shift of the λ（max） of 1 in THF in PSS to 590 nm.

关键词： diarylethene photochromism coordination compound

Design and FPGA verification of a novel reliable real-time data transfer system

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第10期9卷 1406-1410页

作者： yu-ping LIAN Yan han Ming-xu HUO jin-long CHEN Yan ZhanG Institute of Microelectronics and Photoelectronics Zhejiang University Hangzhou 310027 China

Considering the increasing use of information technology with established standards, such as TCP/IP and XML in modem industrial automation, we present a high cost performance solution with FPGA （field programmable gate array） implementation of a novel reliable real-time data transfer system based on EPA （Ethemet for plant automation） protocol and IEEE 1588 standard. This combination can provide more predictable and real-time communication between automation equipments and precise synchronization between devices. The designed EPA system has been verified on Xilinx Spartan3 XC3S1500 and it consumed 75% of the total slices. The experimental results show that the novel industrial control system achieves high synchronization precision and provides a 1.59-ps standard deviation between the master device and the slave ones. Such a real-time data transfer system is an excellent candidate for automation equipments which require precise synchronization based on Ethemet at a comparatively low price.

关键词： Ethemet for plant automation (EPA) IEEE 1588 Precise synchronization Real-time data transfer

环状RNA CHACR调控压力超负荷诱导心肌肥大和氧化应激损伤

在线全文

学校读者我要写书评

暂无评论

中国组织工程研究 2025年第25期29卷 5362-5373页

作者：王霜韩瑜袁敏曹济民孙腾山西医科大学细胞生理学教育部重点实验室山西省细胞生理学重点实验室山西医科大学基础医学院生理学系山西省太原市030001

背景:病理性心肌肥大是多种心脏疾病的危险促进因素,但其发病机制仍未阐明。环状RNA与心肌肥大密切相关,然而环状RNA CHACR在心肌肥大中的作用及调控机制尚未见报道。目的:探究环状RNA CHACR在压力超负荷诱导心肌肥大中的作用及机制。方... 详细信息

背景:病理性心肌肥大是多种心脏疾病的危险促进因素,但其发病机制仍未阐明。环状RNA与心肌肥大密切相关,然而环状RNA CHACR在心肌肥大中的作用及调控机制尚未见报道。目的:探究环状RNA CHACR在压力超负荷诱导心肌肥大中的作用及机制。方法:①心脏原位注射环状RNA CHACR过表达慢病毒1周后进行横向主动脉缩窄手术诱导小鼠心肌肥大。术后8周,计算心脏质量/胫骨长比值和肺质量/胫骨长比值,测量心肌细胞表面积,检测肥大标志基因表达水平和心肌纤维化程度,评估心功能。②H9c2心肌细胞给予环状RNA CHACR过表达慢病毒处理72 h,然后加入1μmol/L血管紧张素Ⅱ处理24 h诱导心肌细胞肥大。通过检测心肌细胞表面积、肥大标志基因表达水平、蛋白质/DNA比值评估细胞肥大情况,通过检测活性氧水平和线粒体膜电位评估氧化应激损伤情况。结果与结论:①在体内和体外心肌肥大模型中,环状RNA CHACR的表达水平均显著降低(P<0.01);②过表达环状RNA CHACR显著抑制了横向主动脉缩窄手术诱导的小鼠心肌肥大表型,主要表现为心脏体积减小、心脏质量/胫骨长比值显著降低(P<0.05),肺质量/胫骨长比值显著降低(P<0.05),心肌细胞表面积显著减小(P<0.05),以及心肌肥大相关标志基因心房利钠肽(P<0.05)、脑钠肽(P<0.05)表达水平降低;③过表达环状RNA CHACR显著抑制了横向主动脉缩窄手术诱导的小鼠心脏纤维化,表现为纤维化面积减小(P<0.01)和纤维化标志基因Acta1的表达水平降低(P<0.05);④过表达环状RNA CHACR显著改善了小鼠心功能,主要表现为射血分数(P<0.05)和短轴缩短率(P<0.01)显著升高;(5)过表达环状RNA CHACR显著抑制了血管紧张素Ⅱ诱导的心肌细胞肥大,主要表现为心肌细胞表面积显著减小(P<0.05),心房利钠肽(P<0.05)和脑钠肽(P<0.05)表达水平显著下调,以及蛋白质/DNA比值显著减小(P<0.05);(6)过表达环状RNA CHACR显著抑制了血管紧张素Ⅱ诱导的活性氧水平升高(P<0.001)和线粒体膜电位降低(P<0.05)。结果表明,环状RNA CHACR在体内和体外心肌肥大模型中表达水平显著降低,过表达环状RNA CHACR显著抑制心肌肥大,减轻心肌纤维化,改善心功能,并且显著减轻了血管紧张素Ⅱ诱导的心肌细胞氧化应激损伤。

关键词：心肌肥大环状RNA CHACR 血管紧张素Ⅱ 横向主动脉缩窄手术氧化应激损伤