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| 1 | The M5.0 Suining-Tongnan (China) earthquake of 31 January 2010:A destructive earthquake occurring in sedimentary cover显示文摘Usually, only crystalline basement is strong enough to store the massive strain energy that can be released in a damaging earthquake. By contrast, sedimentary cover is weak, because of its relatively high porosity and fluids. Therefore, it generally cannot accumulate enough energy for strong earthquakes. On January 31, 2010, a M5.0 earthquake occurred near the border of Suining and Tongnan in China. It excited strong short-period Rayleigh waves Rg, indicative of its shallow focal depth. The focal depth is constrained to less than 4 km, most probably in the range of 1-3 km, by modeling amplitude dependence on the frequency and waveforms of teleseismic depth phases (pP, sP). Because the local Mesozoic sedimentary cover is about 6 km thick, this earthquake should have occurred in the sedimentary cover. Though some shallow earthquakes with magnitudes up to M4 occur in Paleozoic sediments, this earthquake is the first M5 event studied in Mesozoic sedimentary cover. This event provides a rare opportunity to study seismogenic processes of damaging earthquakes in sedimentary basins. | LUO Yan NI SiDao ZENG XiangFang XIE Jun CHEN Yong LONG Feng | 2011 | Chinese Science Bulletin2011，56，6： | 17 |
| 2 | Reversing drug resistance of soft tumor-repopulating cells by tumor cell-derived chemotherapeutic microparticles显示文摘颠倒使人重新住入肿瘤的房间(TRC ) 的药抵抗或起源的发展中的新奇途径像房间的癌症房间是迫切临床的需要改进癌症病人的结果。这里,我们显示出用肿瘤颠倒 TRC 的药抵抗的一条创新途径包含反肿瘤药的导出房间的 microparticles (T-MPs ) 。由比区分的癌症房间更可变形的优点, TRC 优先地收起 T-MPs 在进入房间以后释放反肿瘤药,它接着导致 TRC 的死亡。内在的机制包括防碍药流出并且支持这些药的原子入口。我们的调查结果在用有希望的临床的应用程序颠倒 TRC 的药抵抗在 T-MPs 的举起和一条新奇途径的有效性表明肿瘤房间柔软的重要性。 | Jingwei Ma Yi Zhang Ke Tang Huafeng Zhang Xiaonan Yin Yong Li Pingwei Xu Yanling Sun Ruihua Ma Tiantian Ji Junwei Chen Shuang Zhang Tianzhen Zhang Shunqun Luo Yang Jin Xiuli Luo Chengyin Li Hongwei Gong Zhixiong Long Jinzhi Lu Zhuowei Hu Xuetao Cao Ning Wang Xiangliang Yang Bo Huang | 2016 | Cell Research2016，26，6： | 17 |
| 3 | SHRIMP U-Pb zircon age of tuff at the bottom of the Lower Cambrian Niutitang Formation,Zunyi,South China显示文摘A SHRIMP U-Pb zircon geochronology study of the tuff at the bottom of the Lower Cambrian Niutitang Formation at Songlin,Zunyi,South China yielded a mean 206Pb/238U age of 518±5 Ma.It is significantly younger than the Re-Os ages of 537―542 Ma for the overlying polymetallic Ni-Mo-PGE-rich layer in the basal Niutitang Formation at Songlin,suggesting that the Re-Os ages might represent that of the original magma chamber for the Ni-Mo-PGE-rich layer rather than the formation age of the strata.The intra-basinal stratigraphic correlation also implies that the absolute age of the Chengjiang biota should be younger than 518±5 Ma.Our new result,together with the SHRIMP U-Pb zircon age for the K-bentonite in the Zhongyicun member of the Zhujiaqing Formation at the Meishucun section,Yunnan Province,provides a temporal constraint for the Lower Cambrian of the Yangtze Platform in South China. | ZHOU MingZhong LUO TaiYi LI ZhengXiang ZHAO Hui LONG HanSheng YANG Yong | 2008 | Chinese Science Bulletin2008，53，4： | 17 |
| 4 | High-capacity porous carbons prepared by KOH activation of activated carbon for supercapacitors显示文摘High-performance supercapacitor electrode materials are prepared from the commercially available activated carbon(AC) through a facile and low-cost chemical activation method.The obtained results show that AC activated by KOH with an alkali/carbon ratio of 6/1(ACK6) possesses a specific surface area of 3405 m^2/g,a large pore volume of 2.01 cm^3/g,and exhibits the highest initial specific capacitance of335 F/g at the current density of 0.5 A/g in 6 mol/L KOH,and 85%coloumbic efficiency for 5000 cycles at20 mV/s. | Yong Xiao Chao Long Ming-Tao Zheng Han-Wu Dong Bing-Fu Lei Hao-Ran Zhang Ying-Liang Liu | 2014 | Chinese Chemical Letters2014，25，6： | 13 |
| 5 | Welding Deviation Detection Algorithm Based on Extremum of Molten Pool Image Contour显示文摘The welding deviation detection is the basis of robotic tracking welding, but the on-line real-time measurement of welding deviation is still not well solved by the existing methods. There is plenty of information in the gas metal arc welding(GMAW) molten pool images that is very important for the control of welding seam tracking. The physical meaning for the curvature extremum of molten pool contour is revealed by researching the molten pool images, that is, the deviation information points of welding wire center and the molten tip center are the maxima and the local maxima of the contour curvature, and the horizontal welding deviation is the position difference of these two extremum points. A new method of weld deviation detection is presented, including the process of preprocessing molten pool images, extracting and segmenting the contours, obtaining the contour extremum points, and calculating the welding deviation, etc. Extracting the contours is the premise, segmenting the contour lines is the foundation, and obtaining the contour extremum points is the key. The contour images can be extracted with the method of discrete dyadic wavelet transform, which is divided into two sub contours including welding wire and molten tip separately. The curvature value of each point of the two sub contour lines is calculated based on the approximate curvature formula of multi-points for plane curve, and the two points of the curvature extremum are the characteristics needed for the welding deviation calculation. The results of the tests and analyses show that the maximum error of the obtained on-line welding deviation is 2 pixels(0.16 mm), and the algorithm is stable enough to meet the requirements of the pipeline in real-time control at a speed of less than 500 mm/min. The method can be applied to the on-line automatic welding deviation detection. | ZOU Yong JIANG Lipei LI Yunhua XUE Long HUANG Junfen HUANG Jiqiang | 2016 | Chinese Journal of Mechanical Engineering2016，29，1： | 12 |
| 6 | The effect of immediate surgical bipolar plasmakinetic transurethral resection of the prostate on prostatic hyperplasia with acute urinary retention显示文摘在现在的学习,我们评估了立即的外科的双极的 plasmakinetic 的安全和功效为有有尖锐尿保留(AUR ) 的良性的 prostatic 增生(BPH ) 的病人的前列腺(PK-TURP ) 的经尿道的切除术。我们进行了收到了 PK-TURP 的 BPH 病人的临床的数据的回顾的分析。1126 个 BPH 病人的一个总数被划分成 AUR (n = 348 ) 并且 non-AUR 组(n = 778 ) 。在尿道的导管被移开以后,在 AUR 组的尿白人血房间(白血球) 计数显著地与 non-AUR 组相比增加了(P < 0.01 ) 。然而,在国际前列腺症状分数,痛苦的泌尿,和最大的尿流动率没有重要差别。AUR 组的住院的持续时间比 non-AUR 组的长(P < 0.001 ) 。在 AUR 的病人组织的 87.1% 的一个总数(303/348 ) 并且 84.1%(654/778 ) 在 non-AUR 组的病人手术后的后续访问完成了所有。在在在外科以后的 3 个月以内的 AUR 组的尿道感染的发生在 non-AUR 组比那显著地高(P < 0.01 ) 。在 AUR 组的暂时的尿不能自制的发生没展出重要差别。在在外科以后的 3-12 月期间,在在二个组之间的主要复杂并发症没有重要差别。Multivariate 回归分析出现了那年龄, postvoid 剩余,最大的尿流动率,糖尿病,和高血压,然而并非 AUR 的存在,是 IPSS post-PK-TURP 的独立预言者。在结论, AUR 伴随的病人上的立即的 PK-TURP 外科安全、有效。 | Le-Ye He Yi-Chuan Zhang Jing-Liang He Liu-Xun Li Yong Wang Jin Tang Jing Tan Kuangbaio Zhong Yu-Xin Tang Zhi Long | 2016 | Asian Journal of Andrology2016，18，1： | 12 |
| 7 | The enhanced X-ray Timing and Polarimetry mission—eXTP显示文摘In this paper we present the enhanced X-ray Timing and Polarimetry mission—eXTP. eXTP is a space science mission designed to study fundamental physics under extreme conditions of density, gravity and magnetism. The mission aims at determining the equation of state of matter at supra-nuclear density, measuring effects of QED, and understanding the dynamics of matter in strong-field gravity. In addition to investigating fundamental physics, eXTP will be a very powerful observatory for astrophysics that will provide observations of unprecedented quality on a variety of galactic and extragalactic objects. In particular, its wide field monitoring capabilities will be highly instrumental to detect the electro-magnetic counterparts of gravitational wave sources.The paper provides a detailed description of:(1) the technological and technical aspects, and the expected performance of the instruments of the scientific payload;(2) the elements and functions of the mission, from the spacecraft to the ground segment. | ShuangNan Zhang Andrea Santangelo Marco Feroci YuPeng Xu FangJun Lu Yong Chen Hua Feng Shu Zhang Sφren Brandt Margarita Hernanz Luca Baldini Enrico Bozzo Riccardo Campana Alessandra De Rosa YongWei Dong Yuri Evangelista Vladimir Karas Norbert Meidinger Aline Meuris Kirpal Nandra Teng Pan Giovanni Pareschi Piotr Orleanski QiuShi Huang Stephane Schanne Giorgia Sironi Daniele Spiga Jiri Svoboda Gianpiero Tagliaferri Christoph Tenzer Andrea Vacchi Silvia Zane Dave Walton ZhanShan Wang Berend Winter Xin Wu Jean J.M.in't Zand Mahdi Ahangarianabhari Giovanni Ambrosi Filippo Ambrosino Marco Barbera Stefano Basso Jörg Bayer Ronaldo Bellazzini Pierluigi Bellutti Bruna Bertucci Giuseppe Bertuccio Giacomo Borghi XueLei Cao Franck Cadoux Francesco Ceraudo TianXiang Chen Yu Peng Chen Jerome Chevenez Marta Civitani Wei Cui WeiWei Cui Thomas Dauser Ettore Del Monte Sergio Di Cosimo Sebastian Diebold Victor Doroshenko Michal Dovciak YuanYuan Du Lorenzo Ducci QingMei Fan Yannick Favre Fabio Fuschino JoséLuis Ga'lvez Min Gao MingYu Ge Olivier Gevin Marco Grassi QuanYing Gu YuDong Gu DaWei Han Bin Hong Wei Hu Long Ji ShuMei Jia WeiChun Jiang Thomas Kennedy Ingo Kreykenbohm Irfan Kuvvetli Claudio Labanti Luca Latronico Gang Li MaoShun Li Xian Li Wei Li ZhengWei Li Olivier Limousin HongWei Liu XiaoJing Liu Bo Lu Tao Luo Daniele Macera Piero Malcovati Adrian Martindale Malgorzata Michalska Bin Meng Massimo Minuti Alfredo Morbidini Fabio Muleri Stephane Paltani Emanuele Perinati Antonino Picciotto Claudio Piemonte JinLu Qu Alexandre Rachevski Irina Rashevskaya Jerome Rodriguez Thomas Schanz ZhengXiang Shen LiZhi Sheng JiangBo Song LiMing Song Carmelo Sgro Liang Sun Ying Tan Phil Uttley Bo Wang DianLong Wang GuoFeng Wang Juan Wang LangPing Wang YuSa Wang Anna L.Watts XiangYang Wen Jörn Wilms ShaoLin Xiong JiaWei Yang Sheng Yang YanJi Yang Nian Yu WenDa Zhang Gianluigi Zampa Nicola Zampa Andrzej A.Zdziarski AiMei Zhang ChengMo Zhang Fan Zhang Long Zhang Tong Zhang Yi Zhang XiaoLi Zhang ZiLiang Zhang BaoSheng Zhao ShiJie Zheng Yu Peng Zhou Nicola Zorzi J.Frans Zwart | 2019 | Science China(Physics,Mechanics & Astronomy)2019，62，2： | 11 |
| 8 | Advances on three-dimensional electrodes for micro-supercapacitors:A mini-review显示文摘Owing to the high power density,long cycle life and maintain-free,micro-supercapacitors(MSCs)stand out as preferred miniaturized energy source for themiscellaneous autonomous electronic components.However,the shortage of energy density is the main stumbling block for their practical applications.To solve this energy issue,constructing a three-dimensional(3D)electrode within the limited footprint area is proposed as a new solution for improving the energy storage capacity ofMSCs.In the last few years,extensive efforts have been devoted to developing 3D electrodes for MSCs,and significant progress and breakthrough have been achieved.While,there is still lack of systematic summary on the 3D electrode design strategies.To this end,it is imperative to outline the basic design conception,summarize the current states,and discuss the future research about 3D electrodes in MSCs based on the latest development. | Long Liu Huaping Zhao Yong Lei | 2019 | InfoMat2019，1，1： | 11 |
| 9 | A novel polyaniline/mesoporous carbon nano-composite electrode for asymmetric supercapacitor显示文摘polyaniline/mesoporous 碳(PANI/CMK-3 )nano 合成的一篇小说与用作支持的 mesoporous 碳(CMK-3 ) 被准备。电气化学的不对称的电容器被分别地把合成的 PANI/CMK-3 和 CMK-3 用作积极、否定的电极成功地设计了。结果证明不对称的电容器的分泌物电容能在 5 mA/cm2 的当前的密度和 1.4 V 的房间电压下面到达 87.4 F/g。不对称的电容器的精力密度直到有 206 W/kg 的力量密度的 23.8 Wh/kg。而且,用这 PANI/CMK-3 的 PANI/CMK-3CMK-3 不对称的电容器 nano 合成能快速被激活并且拥有高 chargedischarge 效率。 | Jian Jun Cai Ling Bin Kong Jing Zhang Yong Chun Luo Long Kang | 2010 | Chinese Chemical Letters2010，21，12： | 11 |
| 10 | Vertical dynamic response of the ballastless track on long-span plate-truss cable-stayed bridges显示文摘An analytical model is presented to study vertical dynamic response of the ballastless track on long-span plate-truss cable-stayed bridges based on an explicit dynamic analysis method.In the model,the train,ballastless track and bridge are treated as a coupled vibration system with interaction.By simulating the dynamic process of the system,this paper discusses the distribution law of dynamic responses of the bridge deck and the bed slab.It shows the necessity of a base plate for the ballastless track on the long-span plate-truss cable-stayed bridge.Comparison of the influence of different train speeds and stiffness of the elastic vibration-damping pad on the dynamic responses of the bridge deck and the bed slab is also made.The reasonable stiffness value of elastic vibration-damping pad is proposed. | LI Yong Le SU Yang XIA Fei Long ZHANG Nan | 2015 | Science China(Technological Sciences)2015，58，2： | 9 |
| 11 | Age exerts a continuous effect in the outcomes of Asian breast cancer patients treated with breast-conserving therapy显示文摘Background:Asians are diagnosed with breast cancer at a younger age than Caucasians are.We studied the effect of age on locoregional recurrence and the survival of Asian breast cancer patients treated with breast-conserving therapy.Methods:Medical records of 2492 patients treated with breast-conserving therapy between 1989 and 2012 were reviewed.The Kaplan-Meier method was used to estimate locoregional recurrence,breast cancer-free survival,and breast cancer-specific survival rates.These rates were then compared using log-rank tests.Outcomes and age were modeled by Cox proportional hazards.Fractional polynomials were then used to test for non-linear relationships between age and outcomes.Results:Patients≤40 years old were more likely to have locoregional recurrence than were older patients(Hazard ratio[HR]=2.32,P<0.001).Locoregional recurrence rates decreased year-on-year by 4%for patients with luminal-type breast cancers,compared with 8%for those with triple-negative cancers.Similarly,breast cancer-free survival rates increased year-on-year by 4%versus 8%for luminal-type and triple-negative cancers,respectively.Breast cancer-spe-cific survival rates increased with age by 5%year-on-year.Both breast cancer-free survival and breast cancer-specific survival rates in patients with luminal cancers exhibited a non-linear(“L-shaped”)relationship-where decreasing age at presentation was associated with escalating risks of relapse and death.The influence of age on overall survival was confounded by competing non-cancer deaths in older women,resulting in a“U-shaped”relationship.Conclusions:Young Asian breast cancer patients have a continuous year-on-year increase in rates of disease relapse and cancer deaths compared with older patients with no apparent threshold. | Fuh Yong Wong Wei Ying Tham Wen Long Nei Cindy Lim Hui Miao | 2018 | Cancer Communications2018，38，1： | 9 |
| 12 | Partial Teleportation of Entanglement Through Natural Thermal Entanglement in Two-Qubit Heisenberg XXX Chain显示文摘在有 XXX Heisenberginteraction 的二 qubits 之间的自然热纠纷被学习。为反铁磁性物质,增加在批评的点下面联合力量或减少的温度增加纠纷。作为输入的量隧道,纠纷和纠缠的状态经由部分远距传物被转移的信息基于热纠纷。我们发现转移的纠纷将在这个过程期间被失去,并且为纠纷忠实,部分远距传物作为在 1/4 以外的纠缠的隧道的同时发生比古典通讯优异。我们证明在输入的两个关联信息纠缠了移植粒子线性地被驱散的电视的州、单个的信息。在量隧道,更多的纠纷和关联信息的 Withmore 纠纷能被转移。 | ZHANG Yong LONG Gui-Lu WU Yu-Chun GUO Guang-Can | 2007 | Communications in Theoretical Physics2007，47，5： | 9 |
| 13 | Welding Polarity Effects on Weld Spatters and Bead Geometry of Hyperbaric Dry GMAW显示文摘Welding polarity has influence on welding stability to some extent, but the specific relationship between welding polarity and weld quality has not been found, especially under the hyperbaric environment. Based on a hyperbaric dry welding experiment system, gas metal arc welding(GMAW) experiments with direct current electrode positive(DCEP) and direct current electrode negative(DCEN) operations are carried out under the ambient pressures of 0.1 MPa, 0.4 MPa, 0.7 MPa and 1.0 MPa to find the influence rule of different welding polarities on welding spatters and weld bead geometry. The effects of welding polarities on the weld bead geometry such as the reinforcement, the weld width and the penetration are discussed. The experimental results show that the welding spatters gradually grow in quantity and size for GMAW with DCEP, while GMAW with DCEN can produce fewer spatters comparatively with the increase of the ambient pressure. Compared with DCEP, the welding current and arc voltage waveforms for DCEN is more stable and the distribution of welding current probability density for DCEN is more concentrated under the hyperbaric environment. When the ambient pressure is increased from 0.1 MPa to 1.0 MPa, the effects of welding polarities on the reinforcement, the weld width and the penetration are as follows: an increase of 0.8 mm for the weld reinforcement is produced by GMAW with DCEN and 1.3 mm by GMAW with DCEP, a decrease of 7.2 mm for the weld width is produced by DCEN and 6.1 mm by DCEP; and an increase of 3.9 mm for the penetration is produced by DCEN and 1.9 mm by DCEP. The proposed research indicates that the desirable stability in the welding procedure can be achieved by GMAW with DCEN operation under the hyperbaric environment. | XUE Long WU Jinming HUANG Junfen HUANG Jiqiang ZOU Yong LIU Jian | 2016 | Chinese Journal of Mechanical Engineering2016，29，2： | 9 |
| 14 | Two gap-free reference genomes and a global view of the centromere architecture in rice显示文摘Rice(Oryza sativa),a major staple throughout the world and a model system for plant genomics and breeding,was the first crop genome sequenced almost two decades ago.However,reference genomes for all higher organisms to date contain gaps and missing sequences.Here,we report the assembly and analysis of gap-free reference genome sequences for two elite O.sativa xian/indica rice varieties,Zhenshan 97 and Minghui 63,which are being used as a model system for studying heterosis and yield.Gap-free reference genomes provide the opportunity for a global view of the structure and function of centromeres.We show that all rice centromeric regions share conserved centromere-specific satellite motifs with different copy numbers and structures.In addition,the similarity of CentO repeats in the same chromosome is higher than across chromosomes,supporting a model of local expansion and homogenization.Both genomes have over 395 non-TE genes located in centromere regions,of which∼41%are actively transcribed.Two large structural variants at the end of chromosome 11 affect the copy number of resistance genes between the two genomes.The availability of the two gap-free genomes lays a solid foundation for further understanding genome structure and function in plants and breeding climate-resilient varieties. | Jia-Ming Song Wen-Zhao Xie Shuo Wang Yi-Xiong Guo Dal-Hoe Koo Dave Kudrna Chenbo Gong Yicheng Huang Jia-Wu Feng Wenhui Zhang Yong Zhou Andrea Zuccolo Evan Long Seunghee Lee Jayson Talag Run Zhou Xi-Tong Zhu Daojun Yuan Joshua Udall Weibo Xie Rod AWing Qifa Zhang Jesse Poland Jianwei Zhang Ling-Ling Chen | 2021 | Molecular Plant2021，14，10： | 9 |
| 15 | D-ribose increases triglyceride via upregulation of DGAT in the liver显示文摘Dear Editor, Fatty liver disease or hepatic steatosis, recognized as the hepatic component of metabolic syndrome, can progress to cirrhosis and hepatocellular carcinoma (Youngwanichsetha, 2018). | Yao Chen Lexiang Yu Yan Wei Yang Long Yong Xu Tao He Rongqiao He | 2019 | Science China(Life Sciences)2019，62，6： | 9 |
| 16 | Coral reef-like polyanaline nanotubes prepared by a reactive template of manganese oxide for supercapacitor electrode显示文摘由 nanopaticles 组成的珊瑚像礁石的 PANI nanotubes 被锰氧化物的一个反应模板成功地综合。结构被使用 SEM, TEM,和英尺红外描绘,并且这些 nanotubes 的 supercapacitive 行为与周期的 voltammetry (CV ) 被调查,并且 chargedischarge 分别地测试。533 F/g 的一个最大的特定的电容能在 1 mol/L 被完成有 0.2 ~ 0.8 V 的潜在的范围的水的 H2SO4 (对浸透的甘汞电极) 在为 PANI 电极的一种一半房间安装配置,为电气化学的电容器在电极材料建议它的潜在的申请。 | Ling Ren Wang Fen Ran Yong Tao Tan Lei Zhao Ling Bin Kong Long Kang | 2011 | Chinese Chemical Letters2011，22，8： | 8 |
| 17 | Creation of Entanglement with Nonlocal Operations显示文摘We discuss how to create more entanglement with nonlocal operations acting on two-particle states. For a given nonlocal operation, we find that some input states cannot produce entanglement and some produce the maximal entanglement, and find that any initial entangled states can produce more entanglement than initial product states. | ZHANG Yong CAO Wan-Cang LONG Gui-Lu | 2005 | Communications in Theoretical Physics2005，44，4X： | 8 |
| 18 | Protective Effects of Quercetin on Cadmium-induced Cytotoxicity in Primary Cultures of Rat Proximal Tubular Cells显示文摘Objective To investigate the protective effects of quercetin on cadmium-induced cytotoxicity in primary cultures of rat proximal tubular(rPT)cells.Methods Primary cultures of rPT cells undergoing exponential growth were incubated with 1.0 μg/mL quercetin and/or cadmium(2.5,5.0 μmol/L),in a serum-free medium at 37 ℃ at different time intervals.Commercial kits were used and flow cytometric analyses were performed on rPT cell cultures to assay apoptosis and oxidative stress.Results Exposure of rPT cells to cadmium acetate(2.5,5.0 μmol/L)induced a decrease in cell viability,caused an increase in apoptotic rate and apoptotic morphological changes.Simultaneously,elevation of intracellular reactive oxygen species,malondialdehyde and calcium levels,depletion of mitochondrial membrane potential and intracellular glutathione,and inhibition of Na +,K +-ATPase,Ca 2+-ATPase,glutathione peroxidase(GSH-Px),catalase(CAT),and superoxide dismutase(SOD)activities were revealed during the cadmium exposure of rPT cells.However,simultaneous supplementation with 1 μg/mL quercetin protected rPT cells against cadmium-induced cytotoxicity through inhibiting apoptosis,attenuating lipid peroxidation,renewing mitochondrial function and elevating the intracellular antioxidants(non-enzymatic and enzymic)levels.Conclusion The present study has suggested that quercetin,as a widely distributed dietary antioxidant,contributes potentially to prevent cadmium-induced cytotoxicity in rPT cells. | WANG Lin LIN Shu Qian HE Yuan Long LIU Gang WANG Zhen Yong | 2013 | Biomedical and Environmental Sciences2013，26，4： | 8 |
| 19 | Constant Speed Control for Complex Cross-section Welding Using Robot Based on Angle Self-Test显示文摘Expandable profile liner(EPL) is a promising new oil well casing cementing technique, and welding is a major EPLs connection technology. Connection of EPL is still in the stage of manual welding so far, automatic welding technology is a hotspot of EPL which is one of the key technologies to be solved. A robot for automatic welding of '8' type EPL is studied. Four quadrants of mathematical equations of the 8-shaped cross-section track of EPL, consisting of multiple arcs, are established. Mechanism program for complex cross-section welding of EPL based on angle detection is proposed according to characteristics of small size, small valleys, and large forming errors, etc. A welding velocity vector control model is established by linkage control of a welding vehicle, a small driven actuator, and a height tracking mechanism. A constant speed control model based on an angle and symmetrical analysis model of rectangular coordinate system for EPL is built. Constraint conditions of constant speed control between each section are analyzed with 4 sections in first quadrant as an example, and cooperation work mechanism of the welding vehicle and the small tracking actuator is established based on pressure detection. The constant speed control model using angle self-test can be used to avoid the need for a precise mathematical model for tracking control and to adapt manufacture and installation deviation of EPL workpiece. The model is able to solve constant speed and trajectory tracking problems of EPL cross-section welding. EPL seams welded by the studied robot are good in appearance, and non-destructive testing(NDT) shows the seams are good in quality with no welding defects. Bulge tests show that the maximum pressure of welded EPL is 35 MPa, which can fulfill expansion performance requirements. | XUE Long ZOU Yong HUANG Jiqiang HUANG Junfen TAO Xinghua HU Yanfeng | 2014 | Chinese Journal of Mechanical Engineering2014，27，2： | 8 |
| 20 | Estimation of reproduction numbers of COVID-19 in typical countries and epidemic trends under different prevention and control scenarios显示文摘The coronavirus disease 2019(COVID-19)has become a life-threatening pandemic.The epidemic trends in different countries vary considerably due to different policy-making and resources mobilization.We calculated basic reproduction number(R0)and the time-varying estimate of the effective reproductive number(Rt)of COVID-19 by using the maximum likelihood method and the sequential Bayesian method,respectively.European and North American countries possessed higher (R0)and unsteady Rt fluctuations,whereas some heavily affected Asian countries showed relatively low (R0)and declining Rt now.The numbers of patients in Africa and Latin America are still low,but the potential risk of huge outbreaks cannot be ignored.Three scenarios were then simulated,generating distinct outcomes by using SEIR(susceptible,exposed,infectious,and removed)model.First,evidence-based prompt responses yield lower transmission rate followed by decreasing Rt.Second,implementation of effective control policies at a relatively late stage,in spite of huge casualties at early phase,can still achieve containment and mitigation.Third,wisely taking advantage of the time-window for developing countries in Africa and Latin America to adopt adequate measures can save more people’s life.Our mathematical modeling provides evidence for international communities to develop sound design of containment and mitigation policies for COVID-19. | Chen Xu Yinqiao Dong Xiaoyue Yu Huwen Wang Lhakpa Tsamlag Shuxian Zhang Ruijie Chang Zezhou Wang Yuelin Yu Rusi Long Ying Wang Gang Xu Tian Shen Suping Wang Xinxin Zhang Hui Wang Yong Cai | 2020 | Frontiers of Medicine2020，14，5： | 8 |
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