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The influence of composition of asphaltenes of different genesis on the properties of carbon materials manufactured from them by plasma processing

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Petroleum Science 2023年第6期20卷 3830-3840页

作者： Evgeniya Frantsina Yuliya Petrova Valentina Arkachenkova Andrey Grin'ko alexander pak Pavel Povalyaev Dmitry Zelentsov Kirill Cherednichenko Surgut State University Institute of Natural and Technical Sciencespr.Lenina 1628412SurgutRussian Federation Tomsk Polytechnic University Laboratory of Advanced Materials for the Energy Industrypr.Lenina30643050TomskRussian Federation National University of Oil and Gas Gubkin University Department of Physical and Colloidal Chemistrypr.Lenina65119991MoscowRussian Federation

The results of experimental studies of carbon materials, which are formed in the plasma of a direct current (DC) arc discharge initiated in open air from the asphaltenes of different origins, extracted from the natural asphaltite and from the oil of the Sredne-Ugutskoye Oilfield, are presented. The influence of the initial asphaltene composition on the composition and properties of the resulting carbon materials is analyzed. The initial asphaltenes and the samples of the carbon materials are characterized by the methods of X-ray diffraction, differential thermal analysis, X-ray fluorescence analysis, IR-Fourier spectroscopy, laser diffraction, transmission and scanning electron microscopy. The changes in the composition and structure of the asphaltenes are determined before and after their plasma treatment and the hypotheses are put forward concerning the chemical processes causing the changes in the molecular structure of the samples. As a result of plasma treatment of asphaltenes (100 A, 30 s), it was shown that graphitization occurs, as well as oxidation, and a decrease in sulfur content. Moreover, nanotubes and nano-onions have been detected using electron microscopy. Petroleum asphaltenes after plasma treatment give a less thermostable carbon material, but with a lower content of heteroatoms, and with a large amount of sulfur in the composition of sulfoxide structural fragments. This method is shown to be a promising technology for processing the petroleum feedstock enriched with heavy asphaltene components for the manufacture of carbon nanomaterials: nanotubes, nano-onions and polyhedral graphite.

关键词： Asphaltenes Natural asphaltite Carbon materials Nanomaterials Plasma treatment Graphite

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Machine learning-driven synthesis of TiZrNbHfTaC_(5) high-entropy carbide

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npj Computational Materials 2023年第1期9卷 2293-2303页

作者： alexander Ya.pak Vadim Sotskov Arina A.Gumovskaya Yuliya Z.Vassilyeva Zhanar S.Bolatova Yulia A.Kvashnina Gennady Ya.Mamontov alexander V.Shapeev alexander G.Kvashnin National Research Tomsk Polytechnic University 30 Lenin AvenueTomsk 634050Russia Skolkovo Institute of Science and Technology Skolkovo Innovation CenterBolshoi Blv.30Building 1Moscow 121205Russia Pirogov Russian National Research Medical University 1 Ostrovityanova St.Moscow 117997Russia

Synthesis of high-entropy carbides(HEC)requires high temperatures that can be provided by electric arc plasma method.However,the formation temperature of a single-phase sample remains unknown.Moreover,under some temperatures multi-phase structures can emerge.In this work,we developed an approach for a controllable synthesis of HEC TiZrNbHfTaC_(5) based on theoretical and experimental techniques.We used Canonical Monte Carlo(CMC)simulations with the machine learning interatomic potentials to determine the temperature conditions for the formation of single-phase and multi-phase samples.In full agreement with the theory,the single-phase sample,produced with electric arc discharge,was observed at 2000 K.Below 1200 K,the sample decomposed into(Ti-Nb-Ta)C,and a mixture of(Zr-Hf-Ta)C,(Zr-Nb-Hf)C,(Zr-Nb)C,and(Zr-Ta)C.Our results demonstrate the conditions for the formation of HEC and we anticipate that our approach can pave the way towards targeted synthesis of multicomponent materials.

关键词： carbide materials

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Transcriptomic analyses of localized prostate cancers of East Asian and North American men reveal race-specific luminal-basal and microenvironmental differences

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Cancer Communications 2023年第10期43卷 1164-1168页

作者： Melvin L.K.Chua alexander K.Hakansson Enya H.W.Ong Boon Hao Hong Jing Jing Miao Adelene Y.L.Sim Janice S.H.Tan Kah Min Tan Gabrielle C.J.Lee Kar Perng Low Jeffrey K.L.Tuan Terence W.K.Tan Michael L.C.Wang Joe P.S.Yeong Michael C.S.Tan Lui Shiong Lee Ravindran Kanesvaran Xin Zhao Julian Ho Daniel E.Spratt Edward M.Schaeffer Kae-Jack Tay Yang Liu Elai Davicioni Li Yan Khor Division of Radiation Oncology National Cancer Centre SingaporeSingaporeSingapore Duke-NUS Medical School SingaporeSingapore Division of Medical Sciences National Cancer Centre SingaporeSingaporeSingapore Veracyte IncSan DiegoCAUSA Department of Nasopharyngeal Carcinoma State Key Laboratory of Oncology in South ChinaCollaborative Innovation Center for Cancer MedicineGuangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and TherapySun Yat-sen University Cancer CenterGuangzhouGuangdongP.R.China Faculty of Medicine Nursing and Health SciencesMonash UniversityVictoriaAustralia Department of Anatomical Pathology Singapore General HospitalSingaporeSingapore Department of Pathology Changi General HospitalSingaporeSingapore Department of Urology Sengkang General HospitalSingaporeSingapore Division of Medical Oncology National Cancer Centre SingaporeSingaporeSingapore Department of Radiation Oncology University Hospitals Seidman Cancer CenterCase Comprehensive Cancer CenterClevelandOHUSA Department of Urology Northwestern University Feinberg School of MedicineChicagoILUSA Department of Urology Singapore General HospitalSingaporeSingapore

Dear editor,Prostate cancer(PCa)remains a major healthcare burden in men globally[1].Most patients present with localized disease,and treatment is recommended based on risk classification systems like the National Comprehensive Cancer Network(NCCN)[2].However,these methods are imprecise for estimating metastasis-free survival and prostate cancer-specific mortality and thus biomarkers that can predict tumor aggression are needed[3–5].Several studies have since characterized the molecular landscape of localized PCa in White[4,5]and Black/African-American men[6],but data is lacking in Asian men.The Chinese Prostate Cancer Genome and Epigenome Atlas(CPGEA)reported on the genomic and epigenomic landscape of 208 PCa of men from China[7].Comparative analyses between the CPGEA cohort and data from The Cancer Genome Atlas(TCGA)revealed higher frequencies of Forkhead box A1(FOXA1)and chromodomain-helicase DNA-binding 1(CHD1)mutations,and lower frequencies of phosphatase and tensin homolog(PTEN)mutations and transmembrane protease serine 2-E26 transformationspecific related gene(TMPRSS2-ERG)fusion in Chinese compared with White men[7].These preliminary findings highlight the presence of race-specific differences in molecular phenotypes of PCa.

关键词： landscape Atlas editor

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Productive Response of Brassica rapa L.subsp.chinensis to Application of VIUSID Agro

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Journal of Agricultural Science and Technology(B) 2019年第2期9卷 103-109页

作者： Kolima Pena Calzada Dilier Olivera Viciedo alexander Calero Juan Carlos Rodríguez Bulent Kukurtcu Yanet Milagros Placenciaálvarez Alexei Castro Salas Department of Agronomy Faculty of Agricultural SciencesUniversity of Sancti Spiritus Jose Marti Perez(UNISS)Sancti Spiritus 60100Cuba School of Agricultural and Veterinarian Sciences Sao Paulo State University(UNESP)Jaboticabal 1480Sao PauloBrazil Scientific Department CatalysisS.L.Madrid 28016Spain Department of Mathematics University of Camagüey Ignacio Agramonte LoynazCamagüey 74650Cuba

In order to evaluate the effect of VIUSID agro on the yield response of a pak choi harvest,a randomised block experiment was designed with four treatments and three replications.The treatments were dosages of 0.1,0.2 and 0.3 L/ha and one control.The number of leaves per plant and the fresh and dry mass of the plant were measured.In addition,growth indexes were evaluated,such as relative growth rate,active growth rate,harvest index and agricultural yield.The number of leaves per plant was significantly greater at 35 days after sowing(das)for 0.2 L/ha and 0.3 L/ha treatments,with increases of 15.0%and 14.17%relative to the control.Regarding plant length and fresh mass at the final evaluation,the treatments using higher dosages produced the best results.Regarding the active growth rate,the 0.2 L/ha dosage produced the best effects,and regarding relative growth rate,the 0.2 L/ha and 0.3 L/ha dosages produced the best results relative to the control.The harvest index did not benefit from the used dosages,while a higher agricultural yield was achieved using the 0.2 L/ha and 0.3 L/ha dosages at 18.03%and 12.88%compared to the control.Therefore,VIUSID agro positively influenced the yield behaviour of pak choi.

关键词： VIUSID agro pak choi amino acids vegetables.

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公共卫生监测的过去、现在和未来:(一)过去

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疾病监测 2015年第9期30卷 706-716页

作者：蔡智强李丽萍白雲屛汕头大学医学院伤害预防中心广东汕头515041 渥太华大学流行病学与社区医学教研室渥太华大学院校研究与规划办公室

本文描述通过公共卫生行动的计划、实施和评价对卫生数据不断地系统地进行收集、分析、解释和利用公共卫生信息的过程,对公共卫生监测发展的历史进行了全面地综述。公共卫生监测最早要追溯到公元前3180年埃及第一次记录的传染病。希波... 详细信息

本文描述通过公共卫生行动的计划、实施和评价对卫生数据不断地系统地进行收集、分析、解释和利用公共卫生信息的过程,对公共卫生监测发展的历史进行了全面地综述。公共卫生监测最早要追溯到公元前3180年埃及第一次记录的传染病。希波克拉底(Hippocrates)(公元前460 370年)记录了地方病和流行病;约翰·格兰特(John Graunt)(1620 1674年)提出了系统数据分析;塞缪尔·皮普斯(Samuel Pepys)(1633 1703年)开始了流行病学现场调查;威廉·法尔(William Farr)(1807 1883年)创建了现代监测的概念;约翰·斯诺(John Snow)(1813 1858年)将数据资料和随后的干预活动联系在一起;亚历山大·朗缪尔(alexander Langmuir)(19101993年)首次提出了监测的全面定义,如今已形成系统的理论和大量的监测方法,并在全球范围内建立了公共卫生监测机构。学习公共卫生监测的发展历程,用以反思当前的发展现状,提高和促进公共卫生监测,为人类健康提供理论依据。

关键词：公共卫生监测历史发展流行病

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