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Measurement of atmospheric non-reciprocity effects for satellite-based two-way time-frequency transfer

Photonics Research 2024年第6期12卷 1274-1282页

作者： TING ZENG QI SHEN YUAN CAO JIAN-YU GUAN MENG-ZHE LIAN JIN-JIAN HAN LEI HOU JIAN LU XIN-XIN peng MIN LI WEI-YUE LIU JIN-CAI WU YONG WANG JUAN YIN JI-GANG REN HAI-FENG JIANG QIANG ZHANG cheng-zhi peng JIAN-WEI PAN Hefei National Research Center for Physical Sciences at the Microscale and School of Physical Sciences University of Science and Technology of ChinaHefei 230026China Shanghai Research Center for Quantum Science and CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of ChinaShanghai 201315China Hefei National Laboratory University of Science and Technology of ChinaHefei 230094China Faculty of Information Science and Engineering Ningbo UniversityNingbo 315211China Key Laboratory of Space Active Opto-Electronic Technology Shanghai Institute of Technical PhysicsChinese Academy of SciencesShanghai 200083China Xinjiang Astronomical Observatory Chinese Academy of SciencesUrumqi 830011China

Future optical clock networks will require high-precision optical time-frequency transfer between satellites and ground ***,due to atmospheric turbulence,satellite motion and time delay between the satellite–ground transmission links will cause spatial and temporal variations,respectively,resulting in the breakdown of the time-of-flight reciprocity on which optical two-way time-frequency transfer is ***,we experimentally simulate the atmospheric effects by two-way spatio-temporally separated links between two stationary terminals located 113 km apart and measure the effects for optical two-way time-frequency *** experiment shows that the effect on the link instability is less than 2.3×10^(−19) at 10,000 *** indicates that when the link instability of satellite-ground optical time-frequency transfer is on the order of 10^(−19),it is not necessary to consider the atmospheric non-reciprocity effects.

关键词： breakdown transfer satellite

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惯容-负刚度-阻尼伸臂体系减震性能增效研究

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振动工程学报 2024年第2期37卷 297-305页

作者：汪志昊周宇翔张静雯程志鹏华北水利水电大学土木与交通学院河南郑州450045 河南省结构振动控制与健康监测工程技术研究中心河南郑州450045

为提升传统阻尼伸臂(CDO)体系的减震效果,基于惯容⁃刚度⁃阻尼三元被动减振理论,开展了惯容⁃负刚度⁃阻尼伸臂(INSDO)体系减震性能增效研究。采用Clough⁃Penzien谱模型模拟平稳随机激励,利用增广状态空间建立结构⁃阻尼器⁃激励系统的运动方... 详细信息

为提升传统阻尼伸臂(CDO)体系的减震效果,基于惯容⁃刚度⁃阻尼三元被动减振理论,开展了惯容⁃负刚度⁃阻尼伸臂(INSDO)体系减震性能增效研究。采用Clough⁃Penzien谱模型模拟平稳随机激励,利用增广状态空间建立结构⁃阻尼器⁃激励系统的运动方程;通过求解Lyapunov方程获得随机地震作用下结构响应的均方根值(RMS),基于结构最大有害层间位移角与加速度的多目标控制确定了INSDO体系的最优参数;分析评估了典型实际地震作用下INSDO体系的减震性能。结果表明:在El⁃Centro和Kobe地震波作用下,相比CDO体系,INSDO最优化体系降低了底层位移角RMS均值的57.97%,以及顶层绝对加速度RMS均值的36.99%,验证了多目标优化方法的有效性;相比单独引入惯容或负刚度单元,同时引入两种单元可进一步放大阻尼单元的位移,提升阻尼器耗能与地震输入能量的比值,实现INSDO体系减震性能增效。

关键词：高层建筑阻尼伸臂惯容负刚度减震性能

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荷花MYB蛋白靶基因NnTOM1的克隆及功能分析

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西南农业学报 2024年第5期37卷 972-979页

作者：葛奇顾伟卓程志鹏杨洁胡慧贞陈龙清西南林业大学园林园艺学院/云南省功能性花卉资源及产业化技术工程研究中心昆明650224

【目的】从荷花(Nelumbo nucifera)中克隆NnTOM1基因,并进行生物信息学分析、基因表达模式分析以及烟草遗传转化,为进一步研究NnTOM1基因的功能奠定基础。【方法】通过克隆获得NnTOM1基因,对其蛋白序列进行理化性质和保守结构域预测等... 详细信息

【目的】从荷花(Nelumbo nucifera)中克隆NnTOM1基因,并进行生物信息学分析、基因表达模式分析以及烟草遗传转化,为进一步研究NnTOM1基因的功能奠定基础。【方法】通过克隆获得NnTOM1基因,对其蛋白序列进行理化性质和保守结构域预测等生物信息学分析,利用荧光定量PCR(qRT-PCR)技术分析其组织特异性表达,并利用烟草遗传转化初步验证其生物学功能。【结果】NnTOM1基因编码区(Coding squence,CDS)长度为1191 bp,编码396个氨基酸,蛋白质分子式为C_(1918)H_(3130)N_(560)O_(589)S_(16),二级结构主要由α-螺旋和无规则卷曲组成,含有TOM家族保守结构域(VHS-ENTH-ANTH和GAT),定位于细胞质中;多重序列比对及系统进化树分析表明,其与澳洲坚果(Macadamia integrifolia)、蒂罗花(Telopea speciosissima)、博落回(Macleaya cordata)亲缘关系较近且序列一致性较高;qRT-PCR结果显示,NnTOM1基因在瓣化雄蕊中表达量最高,在根中表达量最低,且在重瓣型品种中表达量比单瓣型品种高;与野生型相比,NnTOM1转基因株系的花瓣颜色加深,花瓣先端变尖,花瓣间隔处加宽,花丝变长且明显长于花柱;且OE-1株系比野生型多出1片花瓣,表现出6片花瓣的表型。【结论】荷花NnTOM1基因可能参与荷花花器官的发育,为后续解析NnTOM1基因的功能提供了初步依据,也为荷花新品种选育提供了新的基因资源。

关键词：荷花 TOM1 基因克隆表达分析遗传转化

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Fe_(2)O_(3)对建窑黄兔毫釉纹路及结构的影响

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中国陶瓷 2024年第7期60卷 66-73页

作者：方圆李豪江财水包启富刘昆陈涛升于欢徐轶男程智鹏周健儿景德镇陶瓷大学景德镇333403 日升窑建盏陶瓷研究所南平353000

以建阳当地原料红土、建瓯石、草木灰等为主要原料,研究不同Fe_(2)O_(3)含量对建窑兔毫釉黄色纹路及显微结构的影响规律,解析毫纹的变化机理。实验结果表明:Fe_(2)O_(3)含量影响着釉中ε-Fe_(2)O_(3)晶体析出的数量、形态及尺寸,使得毫... 详细信息

以建阳当地原料红土、建瓯石、草木灰等为主要原料,研究不同Fe_(2)O_(3)含量对建窑兔毫釉黄色纹路及显微结构的影响规律,解析毫纹的变化机理。实验结果表明:Fe_(2)O_(3)含量影响着釉中ε-Fe_(2)O_(3)晶体析出的数量、形态及尺寸,使得毫纹呈现不同形态。Fe_(2)O_(3)含量为0.11 mol,釉中主要为玻璃相,析出晶体较少,形态为不规则块状,尺寸约50~100 nm,釉面呈灰青色而未出现毫纹。Fe_(2)O_(3)含量增至0.13~0.15 mol,ε-Fe_(2)O_(3)晶体析出较多,形态为短柱状,尺寸约50~150 nm,釉面形成细短蓝白色毫纹。当Fe_(2)O_(3)含量增至0.17~0.19 mol,ε-Fe_(2)O_(3)晶体发育形成单层和多层枝状晶花,尺寸约250~450 nm,釉面形成较长拉丝状黄色兔毫纹。Fe_(2)O_(3)含量增至0.21~0.23 mol,ε-Fe_(2)O_(3)晶体发育成树叶状大晶花,尺寸约1~2μm,釉面形成柿红。釉中Fe_(2)O_(3)含量处于0.15~0.21 mol,釉面形成的黄色毫纹数量适中,形态纤细,呈较好的拉丝状。

关键词：建窑黄兔毫 Fe_(2)O_(3)含量 ε-Fe_(2)O_(3)晶体毫纹形态显微结构

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Clinical analysis of multiple primary gastrointestinal malignant tumors:A 10-year case review of a single-center

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World Journal of Gastrointestinal Oncology 2024年第4期16卷 1204-1212页

作者： cheng-Lou Zhu Ling-zhi peng The First School of Clinical Medicine Lanzhou UniversityLanzhou 730000Gansu ProvinceChina Department of Surgical Oncology Gansu Provincial HospitalLanzhou 730000Gansu ProvinceChina

BACKGROUND Multiple primary malignant tumors(MPMTs)was first described by Billroth as early as 1889,with the first report published by Warren and Gates in *** then,numerous cases have been reported.A literature review of 1104269 patients with cancer revealed that the incidence of MPMTs ranged from 0.73 to 11.7%.In recent years,however,there has been a significant upward trend in the incidence of this phenomenon,which may be associated with many different factors,including the advancement of modern diagnostic procedures facilitating the examination and diagnosis of more MPMTs,increased exposure to chemotherapy and radiotherapy that exacerbate the risk of new malignant tumors in patients with cancer,and prolonged survival of patients with cancer allowing sufficient time for the development of new primary *** To analyze the incidence,clinical features,treatment factors,prevalence,and prognosis of patients with MPMTs in the gastrointestinal tract treated in a single ***,we analyzed the different tumor combinations,time interval between the occurrence of tumors,and *** This retrospective cohort study analyzed 8059 patients with pathologically confirmed gastrointestinal malignant tumors treated at the Gansu Province Hospital in Lanzhou,Gansu,China between June 2011 and June *** these,85 patients had *** clinical features,treatment factors,prevalence,and prognosis of this latter cohort were *** The incidence of MPMTs in patients with gastrointestinal malignant tumors was 1.05%(85/8059),including 83 double primary malignant tumors and two triple primary malignant tumors of which 57(67.06%)were synchronous MPMTs(SMPMTs)and 28(32.94%)were metachronous MPMTs(MMPMTs).The most frequent associations were found between the rectum colon cancers within the SMPMT category and the gastric-colon cancers within the MMPMT *** the MMPMTs,the median interval was 53 *** overall 1-,3-and 5-year survival rates f

关键词： Multiple primary malignant tumors Clinical characteristics Gastrointestinal tract Prognosis Epidemiology

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Interface strengthening for thermal sprayed WC-10Co4Cr coating subjected to pulsed magnetic treatment

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Rare Metals 2024年第2期43卷 780-795页

作者： cheng-Kai Qian Qu Liu Heng Wang Ke-Jian Li zhi-peng Cai Department of Mechanical Engineering Tsinghua UniversityBeijing100084China Tianjin Research Institute for Advanced Equipment Tsinghua UniversityTianjin300304China State Key Laboratory of Tribology in Advanced Equipment Tsinghua UniversityBeijing100084China

The reliability of the coated industry components demands ideal fatigue properties of the coating,and it is mainly determined by the performance of the *** this study,pulsed magnetic treatment(PMT)was applied to the thermal sprayed WC-10Co4Cr coating,and the fatigue lifetime of the coated bolt increased by 219.82%under an imitation of the operating mode *** tests further proved that both the adhesion and cohesion strength were improved after PMT,and they benefit from the interface strengthening *** formation of coherent WC/Co interfaces was characterized by in-situ transmission electron microscopy(TEM),and the molecular dynamic simulations indicate that the work of separation of these interfaces is much higher than the original disordered *** stress was relaxed and distributed more homogeneously after PMT,and it mainly contributes to the coating/substrate *** work provides a new post-treatment method focusing on the interfaces in the WC-based coating and gives insight into its mechanism so that it is hopeful to be applied to other kinds of coatings.

关键词： Cemented carbide coating Pulsed magnetic treatment Interface strengthening Fatigue properties Adhesion strength

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Working condition recognition of sucker rod pumping system based on 4-segment time-frequency signature matrix and deep learning

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Petroleum Science 2024年第1期21卷 641-653页

作者： Yun-peng He Hai-Bo cheng peng Zeng Chuan-zhi Zang Qing-Wei Dong Guang-Xi Wan Xiao-Ting Dong State Key Laboratory of Robotics Shenyang Institute of AutomationChinese Academy of SciencesShenyang 110016LiaoningChina Key Laboratory of Networked Control Systems Chinese Academy of SciencesShenyang 110016LiaoningChina Institutes for Robotics and Intelligent Manufacturing Chinese Academy of SciencesShenyang 110169LiaoningChina University of Chinese Academy of Sciences Beijing100049China School of Artifcial Intelligence Shenyang University of TechnologyShenyang 110870LiaoningChina

High-precision and real-time diagnosis of sucker rod pumping system(SRPS)is important for quickly mastering oil well *** learning-based method for classifying the dynamometer card(DC)of oil wells is an efficient diagnosis ***,the input of the DC as a two-dimensional image into the deep learning framework suffers from low feature utilization and high computational ***,different SRPSs in an oil field have various system parameters,and the same SRPS generates different DCs at different ***,there is heterogeneity in field data,which can dramatically impair the diagnostic *** solve the above problems,a working condition recognition method based on 4-segment time-frequency signature matrix(4S-TFSM)and deep learning is presented in this ***,the 4-segment time-frequency signature(4S-TFS)method that can reduce the computing power requirements is proposed for feature extraction of DC ***,the 4S-TFSM is constructed by relative normalization and matrix calculation to synthesize the features of multiple data and solve the problem of data ***,a convolutional neural network(CNN),one of the deep learning frameworks,is used to determine the functioning conditions based on the *** on field data verify that the proposed diagnostic method based on 4S-TFSM and CNN(4S-TFSM-CNN)can significantly improve the accuracy of working condition recognition with lower computational *** the best of our knowledge,this is the first work to discuss the effect of data heterogeneity on the working condition recognition performance of SRPS.

关键词： Sucker-rod pumping system Dynamometer card Working condition recognition Deep learning Time-frequency signature Time-frequency signature matrix

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Effect of cytochrome P4502C19(CYP2C19)gene polymorphism and clopidogrel reactivity on long term prognosis of patients with coronary heart disease after PCI

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Journal of Geriatric Cardiology 2024年第1期21卷 90-103页

作者： cheng-Yan HU Yan-Ling WANG Zhen-Xing FAN Xi-peng SUN Shuai WANG zhi LIU Department of Geriatrics Fu Xing HospitalCapital Medical UniversityBeijingChina Department of Cardiology Xuanwu Hospital Capital Medical UniversityBeijingChina Emergency Department of Xuanwu Hospital Capital Medical UniversityBeijingChina

Objective To investigate the impact of CYP2C19 gene polymorphism on clopidogrel reactivity and its association with longterm clinical outcome in patients with coronary heart disease(CHD)undergoing percutaneous coronary intervention(PCI).Methods In total,675 patients were *** on the platelet inhibition rate,patients were categorized into two groups:clopidogrel low responsiveness(CLR)and normal clopidogrel responsiveness(NCR).The CLR group was divided into ticagrelor and clopidogrel group based on the antiplatelet drugs used in the follow-up *** were classified into three groups(normal metabolizer,intermediate metabolizer,and poor metabolizer)based on the CYP2C19 *** aimed to evaluate the impact of CYP2C19 gene polymorphism on clopidogrel *** cumulative rates of 12-month all-cause deaths,major adverse cardiovascular events(MACCEs),and bleeding events were *** CLR was observed in 44.4%of the overall *** differences were observed in the platelet inhibition rate of clopidogrel among the three metabolic genotypes(P0.05).Conclusions Low response to clopidogrel in CHD patients is correlated with CYP2C19 gene ***2C19 genotyping combined with platelet reactivity is an independent predictor of 12-months MACCEs in patients with clopidogrel treatment after PCI,which is better than either test alone.

关键词： CYP2C19 drugs PCI

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Clinical features and possible pathogenesis of multiple evanescent white dot syndrome with different retinal diseases and events:a narrative review

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International Journal of Ophthalmology(English edition) 2024年第3期17卷 583-595页

作者： Chun-Li Chen Yi-Zhe cheng zhi-Han Zhang Ge Wang Xiao-Yan peng Department of Ophthalmology Beijing Tongren HospitalCapital Medical UniversityBeijing 100730China Beijing Ophthalmology and Visual Science Key Laboratory Beijing 100730China State Key Laboratory of Ophthalmology Zhongshan Ophthalmic CenterSun Yat-sen UniversityGuangzhou 510600Guangdong ProvinceChina

●Multiple evanescent white dot syndrome(MEWDS)is a rare fundus disease,characterized by acute vision loss and visual field *** previous studies have explained the possible pathogenesis and clinical features of primary ***,as the number of reported cases increases,secondary MEWDS occurs in other related retinal diseases and injuries,exhibiting some special *** associated retinal diseases include multifocal choroiditis/punctate inner choroidopathy(MFC/PIC),acute zonal occult outer retinopathy,best vitelliform macular dystrophy,pseudoxanthoma elasticum,and ocular *** related retinal injury is laser photocoagulation,surgery,and *** primary MEWDS often have a self-limiting course,secondary MEWDS may require treatment in some cases,according to the severity of concomitant diseases and ***,MEWDS secondary to MFC/PIC that is prone to forming choroidal neovascularization and focal choroidal excavation,needs positive treatment with *** possible underlying pathogenesis of secondary MEWDS is the exposure of choroidal antigen after the disruption of Bruch’s *** MEWDS-related features in secondary MEWDS are still evanescent under most *** prognosis and treatment depend on the severity of *** studies propose that the etiology is associated with immune factors,including viral infection,inflammation in choroid and Bruch’s membrane,and antigen exposure caused by retinal and/or choroidal *** pathogenic studies should be conducted in the *** diagnosis for secondary MEWDS could benefit patients in aspects of management and prognosis.

关键词： multiple evanescent white dot syndrome punctate inner choroidopathy multifocal choroiditis secondary multiple evanescent white dot syndrome

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Development and validation of a machine learning-based early prediction model for massive intraoperative bleeding in patients with primary hepatic malignancies

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World Journal of Gastrointestinal Oncology 2024年第1期16卷 90-101页

作者： Jin Li Yu-Ming Jia zhi-Lei Zhang cheng-Yu Liu Zhan-Wu Jiang zhi-Wei Hao Li peng Department of Hepatological Surgery The Fourth Hospital of Hebei Medical UniversityShijiazhuang 050011Hebei ProvinceChina Department of General Surgery II Baoding First Central HospitalBaoding 071000Hebei ProvinceChina

BACKGROUND Surgical resection remains the primary treatment for hepatic malignancies,and intraoperative bleeding is associated with a significantly increased risk of ***,accurate prediction of intraoperative bleeding risk in patients with hepatic malignancies is essential to preventing bleeding in advance and providing safer and more effective *** To develop a predictive model for intraoperative bleeding in primary hepatic malignancy patients for improving surgical planning and *** The retrospective analysis enrolled patients diagnosed with primary hepatic malignancies who underwent surgery at the Hepatobiliary Surgery Department of the Fourth Hospital of Hebei Medical University between 2010 and *** regression analysis was performed to identify potential risk factors for intraoperative bleeding.A prediction model was developed using Python programming language,and its accuracy was evaluated using receiver operating characteristic(ROC)curve *** Among 406 primary liver cancer patients,16.0%(65/406)suffered massive intraoperative *** regression analysis identified four variables as associated with intraoperative bleeding in these patients:ascites[odds ratio(OR):22.839;P<0.05],history of alcohol consumption(OR:2.950;P<0.015),TNM staging(OR:2.441;P<0.001),and albumin-bilirubin score(OR:2.361;P<0.001).These variables were used to construct the prediction *** 406 patients were randomly assigned to a training set(70%)and a prediction set(30%).The area under the ROC curve values for the model’s ability to predict intraoperative bleeding were 0.844 in the training set and 0.80 in the prediction *** The developed and validated model predicts significant intraoperative blood loss in primary hepatic malignancies using four preoperative clinical factors by considering four preoperative clinical factors:ascites,history of alcohol consumption,TNM staging,and albumin-bilirubin ***

关键词： Primary liver cancer Intraoperative bleeding Machine learning Model

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