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| 1 | Global Wheat Head Detection(GWHD)Dataset:A Large and Diverse Dataset of High-Resolution RGB-Labelled Images to Develop and Benchmark Wheat Head Detection Methods显示文摘The detection of wheat heads in plant images is an important task for estimating pertinent wheat traits including head population density and head characteristics such as health,size,maturity stage,and the presence of awns.Several studies have developed methods for wheat head detection from high-resolution RGB imagery based on machine learning algorithms.However,these methods have generally been calibrated and validated on limited datasets.High variability in observational conditions,genotypic differences,development stages,and head orientation makes wheat head detection a challenge for computer vision.Further,possible blurring due to motion or wind and overlap between heads for dense populations make this task even more complex.Through a joint international collaborative effort,we have built a large,diverse,and well-labelled dataset of wheat images,called the Global Wheat Head Detection(GWHD)dataset.It contains 4700 high-resolution RGB images and 190000 labelled wheat heads collected from several countries around the world at different growth stages with a wide range of genotypes.Guidelines for image acquisition,associating minimum metadata to respect FAIR principles,and consistent head labelling methods are proposed when developing new head detection datasets.The GWHD dataset is publicly available at http://www.global-wheat.com/and aimed at developing and benchmarking methods for wheat head detection. | Etienne David Simon Madec Pouria Sadeghi-Tehran Helge Aasen Bangyou Zheng Shouyang Liu Norbert Kirchgessner Goro Ishikawa Koichi Nagasawa Minhajul A.Badhon Curtis Pozniak Benoit de Solan Andreas Hund Scott C.Chapman Frédéric Baret Ian Stavness Wei Guo | 2020 | Plant Phenomics2020，2，1： | 13 |
| 2 | Seroepidemiological Investigation of Lyme Disease and Human Granulocytic Anaplasmosis among People Living in Forest Areas of Eight Provinces in China显示文摘Objective Lyme disease and Human granulocytic anaplasmosis are tick‐borne diseases caused by Borrelia burgdorferi and Anaplasma phagocytophilum respectively. We have investigated infection and co-infection of the two diseases in the population of forest areas of eight provinces in China by measuring seroprevalence of antibodies against B. burgdorferi and A. phagocytophilum. Methods Forest areas in 8 provinces were chosen for investigation using whole sampling and questionnaire survey methods. 3 669 serum samples from people in the forest areas were tested for the presence of antibodies by indirect immunofluorescent assay (IFA). Results Seroprevalence against B. burgdorferi was 3% to 15% and against A. phagocytophilum was 2% to 18% in the study sites in the 8 provinces in China. We also found co-infection of B. burgdorferi and A. phagocytophilum in 7 of the 8 provinces (the exception being the Miyun area in Beijing). The seroprevalence for both B. burgdorferi and A. phagocytophilum was significantly higher among people exposed to ticks than among people who were not exposed to ticks. Conclusion We conclude that both pathogens are endemic in the forest areas in the eight provinces, but the prevalence of B. burgdorferi and A. phagocytophilum differs between the provinces. | HAO Qin GENG Zhen HOU Xue Xia TIAN Zhen YANG Xiu Jun JIANG Wei Jia SHI Yan ZHAN Zhi Fei LI Guo Hua YU De Shan WANG Hua Yong XU Jian Guo WAN Kang Lin | 2013 | Biomedical and Environmental Sciences2013，26，3： | 13 |
| 3 | Transient expression and antigenic characterization of HBsAg of HBV nt551 A to G mutant显示文摘NTRODUCTIONFromthelate80s,therehavebeenincreasingnumberofreportsonhepatitisB(HB)patientswithatypicalHBVserologicalmarkers,so... | FANG De Xing 1, LI Fa Qing 1, TAN Wei Guo 1, CHEN Hua Biao 1, JIN Hui Ying 1, LI Su Qin 1, LIN Hou Ji 2 and ZHOU Zhen Xian 2 | 1999 | World Journal of Gastroenterology1999，5，1： | 10 |
| 4 | A Novel Thixotropic Phenomenon——Complex Thixotropic Behavior显示文摘ANovelThixotropicPhenomenon——ComplexThixotropicBehavior*Towhomcorrespondenceshouldbeaddresed.HOUWan-guo*,SUNDe-jun,HANShu-hua... | HOU Wan guo, SUN De jun, HAN Shu hua, ZHANG Chun guang and WANG Guo ting (Institute of Colloid and Interface Chemistry, Shandong University , Jinan, 250100) | 1997 | Chemical Research in Chinese Universities1997，13，1： | 8 |
| 5 | Digital Earth 2020:towards the vision for the next decade显示文摘This position paper is the outcome of a brainstorming workshop organised by the International Society for Digital Earth(ISDE)in Beijing in March 2011.It argues that the vision of Digital Earth(DE)put forward by Vice-President Al Gore 13 years ago needs to be re-evaluated in the light of the many developments in the fields of information technology,data infrastructures and earth observation that have taken place since.The paper identifies the main policy,scientific and societal drivers for the development of DE and illustrates the multi-faceted nature of a new vision of DE grounding it with a few examples of potential applications.Because no single organisation can on its own develop all the aspects of DE,it is essential to develop a series of collaborations at the global level to turn the vision outlined in this paper into reality. | Max Craglia Kees de Bie Davina Jackson Martino Pesaresi Gabor Remetey-Fulopp Changlin Wang Alessandro Annoni Ling Bian Fred Campbell Manfred Ehlers John van Genderen Michael Goodchild Huadong Guo Anthony Lewis Richard Simpson Andrew Skidmore Peter Woodgate | 2012 | International Journal of Digital Earth2012，5，1： | 8 |
| 6 | Association of Overlapped and Un-overlapped Comorbidities with COVID-19 Severity and Treatment Outcomes: A Retrospective Cohort Study from Nine Provinces in China显示文摘Objective Several COVID-19 patients have overlapping comorbidities. The independent role of each component contributing to the risk of COVID-19 is unknown, and how some non-cardiometabolic comorbidities affect the risk of COVID-19 remains unclear.Methods A retrospective follow-up design was adopted. A total of 1,160 laboratory-confirmed patients were enrolled from nine provinces in China. Data on comorbidities were obtained from the patients’ medical records. Multivariable logistic regression models were used to estimate the odds ratio(OR) and 95% confidence interval(95% CI) of the associations between comorbidities(cardiometabolic or non-cardiometabolic diseases), clinical severity, and treatment outcomes of COVID-19.Results Overall, 158(13.6%) patients were diagnosed with severe illness and 32(2.7%) had unfavorable outcomes. Hypertension(2.87, 1.30–6.32), type 2 diabetes(T2 DM)(3.57, 2.32–5.49),cardiovascular disease(CVD)(3.78, 1.81–7.89), fatty liver disease(7.53, 1.96–28.96), hyperlipidemia(2.15, 1.26–3.67), other lung diseases(6.00, 3.01–11.96), and electrolyte imbalance(10.40, 3.00–26.10)were independently linked to increased odds of being severely ill. T2 DM(6.07, 2.89–12.75), CVD(8.47,6.03–11.89), and electrolyte imbalance(19.44, 11.47–32.96) were also strong predictors of unfavorable outcomes. Women with comorbidities were more likely to have severe disease on admission(5.46,3.25–9.19), while men with comorbidities were more likely to have unfavorable treatment outcomes(6.58, 1.46–29.64) within two weeks.Conclusion Besides hypertension, diabetes, and CVD, fatty liver disease, hyperlipidemia, other lung diseases, and electrolyte imbalance were independent risk factors for COVID-19 severity and poor treatment outcome. Women with comorbidities were more likely to have severe disease, while men with comorbidities were more likely to have unfavorable treatment outcomes. | MA Yan ZHU Dong Shan CHEN Ren Bo SHI Nan Nan LIU Si Hong FAN Yi Pin WU Gui Hui YANG Pu Ye BAI Jiang Feng CHEN Hong CHEN Li Ying FENG Qiao GUO Tuan Mao HOU Yong HU Gui Fen HU Xiao Mei HU Yun Hong HUANG Jin HUANG Qiu Hua HUANG Shao Zhen JI Liang JIN Hai Hao LEI Xiao LI Chun Yan LI Min Qing LI Qun Tang LI Xian Yong LIU Hong De LIU Jin Ping LIU Zhang MA Yu Ting MAO Ya MO Liu Fen NA Hui WANG Jing Wei SONG Fang Li SUN Sheng WANG Dong Ting WANG Ming Xuan WANG Xiao Yan WANG Yin Zhen WANG Yu Dong WU Wei WU Lan Ping XIAO Yan Hua XIE Hai Jun XU Hong Ming XU Shou Fang XUE Rui Xia YANG Chun YANG Kai Jun YUAN Sheng Li ZHANG Gong Qi ZHANG Jin Bo ZHANG Lin Song ZHAO Shu Sen ZHAO Wan Ying ZHENG Kai ZHOU Ying Chun ZHU Jun Teng ZHU Tian Qing ZHANG Hua Min WANG Yan Ping WANG Yong Yan 无 | 2020 | Biomedical and Environmental Sciences2020，33，12： | 8 |
| 7 | Study on the causes of local recurence of rectal cancer after curative resection:analysis of 213 cases显示文摘INTRODUCTIONForrectalcancer,surgicalresectionremainstheonlyposiblecure.However,longtermsurvivalaftersurgeryisnotsatisfactory... | YUAN Hong Yin, LI Yan, YANG Guo Liang, BEI De Jiao and WANG Kun | 1998 | World Journal of Gastroenterology1998，4，6： | 7 |
| 8 | 大气二氧化氮与每日总死亡率、心血管和呼吸系统疾病死亡率的短期关联:398个城市的多中心分析显示文摘目的:采用统一的分析方案,评估全球多个国家/地区的二氧化氮(NO_(2))与总死亡率、心血管和呼吸系统疾病死亡率之间的短期关联。研究设计:采用两阶段的时间序列分析方法、过度离散的广义线性模型和多水平meta分析。研究地点:22个低到高收入国家/地区的398个城市。主要结局指标:1973—2018年逐日总死亡人数(6280万人)、心血管疾病死亡人数(1970万人)和呼吸系统疾病死亡人数(550万人)。结果:平均而言,NO_(2)浓度在滞后1天(前1天)每增加10μg/m^(3),会导致总死亡率、心血管和呼吸系统疾病死亡率分别增加0.46%(95%可信区间0.36%~0.57%)、0.37%(0.22%~0.51%)、0.47%(0.21%~0.72%)。在对共污染物(PM_(10)、PM_(2.5)、臭氧、二氧化硫和一氧化碳)进行调整后,这些关联仍然很稳定。所有3种死因的暴露-反应曲线几乎是线性的,没有明显的阈值。在398个城市中,可归因于高过假定零水平的NO_(2)浓度造成的死亡比例为1.23%(95%可信区间0.96%~1.51%)。结论:这项多中心研究提供了关于NO_(2)短期暴露与总死亡率、心血管和呼吸系统死亡风险之间的独立和线性关联的关键证据,说明通过加强NO_(2)的控制和监管限制标准,可获得人群水平的健康收益。 | 孟夏 刘聪(校) 陈仁杰 郑湃(译) 阚海东(校) Francesco Sera Ana Vicedo-Cabrera Ai Milojevic Maria Guo Yuming Tong Shilu Micheline de Sousa Zanotti Stagliorio Coelh Paulo Hilario Nascimento Saldiva Eric Lavigne Patricia Matus Correa Nicolas Valdes Ortega Samuel Osorio Garcia Jan Kysely Ales Urban Hans Orru Marek Maasikmets Jouni J K Jaakkola Niilo Ryti Veronika Huber Alexandra Schneider Klea Katsouyanni Antonis Analitis Masahiro Hashizume Yasushi Honda Chris Fook Sheng Ng Baltazar Nunes João Paulo Teixeira Iulian Horia Holobaca Simona Fratianni Ho Kim Aurelio Tobias Carmeníniguez Bertil Forsberg ChristoferÅström Martina S Ragettli Yue-Liang Leon Guo Shih-Chun Pan Shanshan Li Michelle L Bell Antonella Zanobetti Joel Schwartz Tangchun Wu Antonio Gasparrini | 2021 | 英国医学杂志中文版2021，24，8： | 7 |
| 9 | In situ hybridization assay of androgen receptor gene in hepatocarcinogenesis显示文摘NTRODUCTIONItiswelknownthatsexhormoneplaysanimportantroleinregulationofcelgrowth,organdevelopmentandcarcinogenesis.Butthemost... | ZHAO Guo Qiang, XUE Ling, XU Hong Yu, TANG Xi Ming, HU Rui De and DONG Jun | 1998 | World Journal of Gastroenterology1998，4，6： | 7 |
| 10 | The promoter analysis of the human C17orf25 gene, a novel chromosome 17pl3.3 gene显示文摘The human C17orf25 gene (Accession No. AF177342) is one of thirteen genes cloned from a region displaying a high score of loss of heterozygosity within chromosome 17p13.3 in human hepatocellular car-cinoma in China[l]. To unveil the underlying mechanisms for the transcription regulation of this gene and understand its implication to the hepatocellular carcinogenesis, we looked into the relevant aspects by both bioinformatic and experimental executions. We found: 1, The abundant expression of the C17orf25 gene was evident in all the cell lines and tissue samples tested, showing little hepatoma-selectivity; 2, Its tran-scription starts at a single site, locating at -60 from the translation initiation codon; 3, A 58 bp fragment containing the transcription start, extending from -112 to -55, represents the minimal promoter; 4, The consensus sequence within this fragment recognized by SP1 contributes predominantly to the activity of the minimal promoter; 5, The bioinformatic analysis suggests that the C17ort25 gene may encode a protein in the family of the glyoxalase. Our data has provided some deep insight into both function and regulation of the C17orf25 gene in the context of the normal liver and hepatocellular carcinoma. | JIAN YING GUO, JIAN XU, DA QIN MAO, LI LI FU, JIAN REN GU, JING DE ZHUThe State-Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Ln 2200/25, Xie-Tu Road, Shanghai 200032, China | 2002 | Cell Research2002，12，5： | 7 |
| 11 | Effect of Simulated Microgravity and its Associated Mechanism on Pulmonary Circulation in Rats显示文摘Objective To study the effect of Simulated Microgravity and its Associated Mechanism on Pulmonary Circulation in Rats. Methods Rat tail-suspension model was used to simulate the physiological effects of microgravity and changes in pulmonary blood vessel morphology, pulmonary arterial and venous blood pressure, pulmonary vascular resistance, pulmonary vasomotoricity, as well as the regulation of pulmonary circulation by cytokines produced and released by the lung of rats were measured. Results The walls of pulmonary blood vessels of rats were thickened, and the pulmonary artery was reconstructed with increased pulmonary vascular resistance. The pulmonary blood vessels of rats became more prone to dilation as contractions increased. Rat epithelial Adrenomedulin gene transcription and protein expression were upregulated. The level of basic fibroblast growth Factor of rat was also elevated. Conclusion Findings from the present study on rats revealed that the microgravity can affect pulmonary blood vessel structure, pulmonary arterial pressure, and pulmonary blood vessel self-regulation and cytokine production. | LI Tian Zhi YUAN Ming CHEN Zhen Hong GUO Ying Hua KANG Chun Yan WANG Jing Yu LI Zhi Li WANG De Sheng WANG Hui Juan YUAN Min LIU Chang Ting | 2013 | Biomedical and Environmental Sciences2013，26，2： | 6 |
| 12 | A Facile Synthesis of β-Cyclodextrin Monoaldehyde显示文摘β -Cyclodextrin (β -CD) was directly oxidized in high yield to the corresponding monoaldehyde by cyclized 2-iodoxybenzoic acid (IBX) in DMSO. | Jing HU Cheng Feng YE Yong De ZHAO Jun Biao CHANG Rui Yun GUO(Lanzhou Institute of Chemical Physics, Chinese Academy of Scences Lanzhou 730000)(Henan Institute of Chemistry, Zhengzhou 450002) | 1999 | Chinese Chemical Letters1999，10，4： | 6 |
| 13 | Interaction between the atmospheric boundary layer and a standalone wind turbine in Gansu—Part I: Field measurement显示文摘 | De Shun Li Tao Guo Yin Ran Li Jin Sen Hu Zhi Zheng Ye Li Yu Jia Di WenRui Hu RenNian Li | 2018 | Science China(Physics,Mechanics & Astronomy)2018，61，9： | 6 |
| 14 | DNA methylation and microRNAs in cancer显示文摘DNA methylation is a type of epigenetic modification in the human genome,which means that gene expression is regulated without altering the DNA sequence.Methylation and the relationship between methylation and cancer have been the focus of molecular biology researches.Methylation represses gene expression and can influence embryogenesis and tumorigenesis.In different tissues and at different stages of life,the level of methylation of DNA varies,implying a fundamental but distinct role for methylation.When genes are repressed by abnormal methylation,the resulting effects can include instability of that gene and inactivation of a tumor suppressor gene.MicroRNAs have some aspects in common with this regulation of gene expression.Here we reviewed the influence of gene methylation on cancer and analyzed the methods used to profile methylation.We also assessed the correlation between methylation and other epigenetic modifications and microRNAs.About 55 845 research papers have been published about methylation,and one-fifth of these are about the appearance of methylation in cancer.We conclude that methylation does play a role in some cancer types. | Xiang-Quan Li Yuan-Yuan Guo Wei De | 2012 | World Journal of Gastroenterology2012，18，9： | 5 |
| 15 | Streptozotocin-induced expression of Ngn3 and Pax4 in neonatal rat pancreatic α-cells显示文摘AIM:To investigate the mechanism behind β-cell regeneration in neonatal rat pancreas treated with streptozotocin (STZ).METHODS:Neonatal Sprague Dawley rats were intraperitoneally injected with 70mg/kg STZ.Body weight,pancreas weight and blood glucose were recorded every two days after the treatment.To identify the expression and location of transcription factors in the rat pancreas,double immunofluorescent staining was performed using antibodies to specific cell markers and transcription factors.RESULTS:Expression of Neurogenin 3 (Ngn3),a marker for endocrine precursor cells,was observed by immunofluorescence in a few β-cells and many α-cells.The expression reached a peak 12 d after treatment.Pax4,a transcription factor that lies downstream of Ngn3 and plays an important role in β-cell differentiation,was also expressed in the α-cells of STZ-treated rats.We did not observe significant changes in Nkx6.1,which is essential for β-cell maturation in the treated rats.CONCLUSION:α-cells dedifferentiated into endocrine precursor cells and acquired the ability to dedifferentiate in the neonatal rat pancreas after STZ treatment. | Xiao-Di Liang Yuan-Yuan Guo Ming Sun Ying Ding Ning Wang Li Yuan Wei De | 2011 | World Journal of Gastroenterology2011，17，23： | 5 |
| 16 | In vitro and In vivo Evaluation of the Developed PLGA/HAp/Zein Scaffolds for Bone-Cartilage Interface Regeneration显示文摘Objective To investigate the effect of electronspun PLGA/HAp/Zein scaffolds on the repair of cartilage defects. Methods The PLGA/HAp/Zein composite scaffolds were fabricated by electrospinning method. The physiochemical properties and biocompatibility of the scaffolds were separately characterized by scanning electron microscope(SEM), transmission electron microscope(TEM), and fourier transform infrared spectroscopy(FTIR), human umbilical cord mesenchymal stem cells(h UC-MSCs) culture and animal experiments. Results The prepared PLGA/HAp/Zein scaffolds showed fibrous structure with homogenous distribution. h UC-MSCs could attach to and grow well on PLGA/HAp/Zein scaffolds, and there was no significant difference between cell proliferation on scaffolds and that without scaffolds(P>0.05). The PLGA/HAp/Zein scaffolds possessed excellent ability to promote in vivo cartilage formation. Moreover, there was a large amount of immature chondrocytes and matrix with cartilage lacuna on PLGA/HAp/Zein scaffolds. Conclusion The data suggest that the PLGA/HAp/Zein scaffolds possess good biocompatibility, which are anticipated to be potentially applied in cartilage tissue engineering and reconstruction. | LIN Yong Xin DING Zhi Yong ZHOU Xiao Bin LI Si Tao XIE De Ming LI Zhi Zhong SUN Guo Dong | 2015 | Biomedical and Environmental Sciences2015，28，1： | 5 |
| 17 | Multielement Analysis of Deep-Sea Sediments by Inductively Coupled Plasma Mass Spectrometry显示文摘Marine sediments were dissolved by HNO3-HF-HClO4 in a sealed container at low pressure; HF was evaporated in an open container and salts were dissolved in HCl by heating, then transferred to 2% HNO3 solution. A total of 45 elements, including Li, Be, Sc, Ti, V, Cr, Mn, Co, Ni, Cu, Zn, Ga, Rb, Sr, Y, Zr, Nb, Mo, Cd, In, Sb, Cs, Ba, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Hf, Ta, W, Tl, Pb, Bi, Th and U, were measured by inductively coupled plasma mass spectrometry (ICP-MS). Condi- tions and sample experiments showed that this procedure defines a good experimental method which has the advantages of clear interference, easy operation and reliable results. The concentrations of the 45 elements could be used for resource exploration, envi- ronmental assessment and academic research. | XIA Ning WU Zhaohui GUO Dongfa YAO De | 2008 | Journal of Ocean University of China2008，7，2： | 4 |
| 18 | In flight MTF monitoring and compensation for CCD camera on CBERS-02显示文摘In this article, the approach of simulating ideal tarp scene was proposed to determine the MTF for CCD camera on CBERS-02. The MTF acquired from this technique was compared to those from some common methods. MTFs achieved from different approaches were employed to compensate the CCD images based on three restoration algorithms: the iterative method, the Wiener filter and the modified inverse filter (MIF). The two-dimensional MTF was established with the value at frequency 0.5 for 45° directional MTF as the value at its four corners. This article addressed the variations of the restored CCD images with different techniques of constructing two-dimensional MTF, restoring algorithms and determining the in-flight MTFs. Results showed images restored with the MTF determined from the technique of simulating ideal tarp scene represent the real scene best. And the restoration technique based on the MIF would produce better restored images than the other two techniques. This research also demonstrated that the two-dimensional MTF used for restoration should be interpolated under the control of the MTF for 45° axis, rather than by multiplying the cross-orbit MTF with along-orbit MTF. | GU Xingfa1,2,3, LI Xiaoying1,2,4, MIN Xiangjun5, YU Tao1,2, SUN Jijuan5, ZENG Yong1,2,4, XU Hua1,2 & GUO Ding2,6 1. State Key Laboratory of Remote Sensing Science, Jointly Sponsored by the Institute of Remote Sensing Applications of Chinese Academy of Sciences and Beijing Normal University, Beijing 100101, China 2. The Center for National Spaceborne Demonstration, Beijing 100101, China 3. Institut National de la Recherche Agronomique, Climat Sol Environnement, 84914 Avignon, France 4. Graduate University of Chinese Academy of Sciences, Beijing 100039, China 5. China Center for Resource Satellite Data and Application, Beijing 100830, China 6. University of Electronic Science and Technology of China, Chengdu 610054, China | 2005 | Science China(Technological Sciences)2005，48，S2： | 4 |
| 19 | Initial scalar lithospheric magnetic anomaly map of China and surrounding regions derived from CSES satellite data显示文摘The China Seismo-Electromagnetic Satellite(CSES),China’s first satellite to measure geophysical fields with scientific goals in both space and solid earth physics,was launched successfully in February 2018.It carries high-precision magnetometers to measure the geomagnetic field.In this study,the CSES magnetic data were used to extract the signal of the lithospheric magnetic field caused by magnetized rocks in the crust and uppermost mantle.First,an along-track analysis of the CSES magnetic data was undertaken near the Bangui magnetic anomaly in central Africa and the Tarim magnetic anomaly in China,demonstrating that the CSES magnetic data are indeed sensitive to the lithospheric magnetic anomaly field.Then a lithospheric magnetic anomaly map over China and surrounding regions was derived.This map is consistent with the lithospheric part of the CHAOS-7 model.In particular,it clearly reveals four major magnetic anomalies containing long-wavelength signals at the altitude of lowearth-orbiting satellites.Three magnetic highs are located over the Tarim,Sichuan and Songliao basin,the origins of which could be related to large-scale tectonic-magmatic activities during geological history.A prominent magnetic low is otherwise found in the southern Himalayan-Tibetan plateau,possibly caused by the shallow Curie depth in this region.To further improve the precision of the lithospheric magnetic field model,more detailed data processing and multi-source data merging are needed. | WANG Jie SHEN XuHui YANG YanYan ZEREN ZhiMa HULOT Gauthier OLSEN Nils ZHOU Bin MAGNES Werner DE SANTIS Angelo HUANG JianPing GUO Feng LIU WenLong YU JingBo | 2021 | Science China(Technological Sciences)2021，64，5： | 4 |
| 20 | Effect of Annealing Temperature on Low-temperature Toughness of β-Nucleated Polypropylene Random Copolymer/Ethylene-Propylene-Diene Terpolymer Blends显示文摘In this study, the effect of annealing temperature on the impact toughness of β-nucleated polypropylene random copolymer(PPR) and ethylene-propylene-diene terpolymer(EPDM) blends was investigated by differential scanning calorimetry(DSC), wide-angle X-ray diffraction(WAXD), dynamic mechanical analysis(DMA) and scanning electron microscopy(SEM). Interestingly, the impact strength of β-PPR/20 EPDM blend annealed at 120 ℃ is 1.8 times as high as that of unannealed samples. In addition, the crystalline structure, the relaxation of chain segments and fracture morphology of β-PPR/EPDM blends were also investigated to explore the toughening mechanism related to annealing. The results show that annealing at moderate temperatures results in the improvement of integrity of the crystal structure and the relative content of β-phase. The work provides a possible method to toughen the semicrystalline polymer at low temperatures by annealing. | 丁会利 Li-yuan Guo Dong-jing Li De Zheng Jun Chen Yu-ying Qian | 2015 | Chinese Journal of Polymer Science2015，33，2： | 4 |
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