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Physical and chemical characterization of sediments from an Andean river exposed to mining and agricultural activities: The Moquegua River, Peru

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International Journal of Sediment Research 2022年第6期37卷 780-793页

作者： Luis de Los Santos Valladares Juan Luis Ccamapaza Renato Arturo Valencia-Bedregal Luis Enrique Borja-Castro Jose Velazquez-Garcia Dehiwalage harshani Nimalika Perera Adrian Ionescu David Arvidsson Eustace Peregrine barnes Peter Newton hugo Lepage Patrick Byrne Angel Guillermo Bustamante Dominguez crispin h.w.barnes Cavendish Laboratory Department of Physics University of Cambridge Escuela Acad emico Profesional de Ingeniería Ambiental Universidad Nacional de Moquegua Provincia de Mariscal Nieto Laboratorio de Cer amicos y Nanomateriales Facultad de Ciencias Físicas Universidad Nacional Mayor de San Marcos School of Biological and Environmental Science Liverpool John Moores University

This study presents an analysis of sediments in an Andean river impacted by both natural conditions and anthropogenic activities. Fifty samples were collected from selected sites throughout the Moquegua River drainage basin, and Tambo River headwaters at Pasto Grande, in Peru, and analysed with X-ray diffraction, energy dispersive X-ray spectroscopy, scanning electron microscopy, Fourier-transform infrared spectroscopy and thermogravimetric analysis. Si, Ca, Al, Fe, and O, common constituents of soils, were dominant, along with K, N, and P. The latter originating as primary macronutrients or chemical residuals from fertilizers used in agriculture. higher concentrations of macronutrients and organic components were found in agricultural and urban areas, respectively. Arsenic minerals were also detected, which occur naturally, but possibly at levels augmented by anthropogenic activity. The application of cluster analysis revealed clustering between arsenic, arsenolite, and potassium but no significant geospatial correlation between sample sites in the drainage basin.

关键词： Andean river Moquegua river Sediments Fourier-transform infrared spectroscopy TG-DTG/DTA Clustering analysis

Conducting Polymer-Based e-Refinery for Sustainable hydrogen Peroxide Production

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Energy & Environmental Materials 2024年第2期7卷 334-342页

作者： Zhixing wu Penghui Ding Viktor Gueskine Robert Boyd Eric Daniel G■owacki Magnus Odén Xaνier crispin Magnus Berggren Emma M.Björk Mikhail Vagin Nanostructured Materials Department of PhysicsChemistry and Biology(IFM)Linköping UniversitySE 58183LinköpingSweden Laboratory of Organic Electronics Department of Science and Technology(ITN)Linköping UniversitySE 60174NorrköpingSweden

Electrocatalysis enables the industrial transition to sustainable production of chemicals using abundant precursors and electricity from renewable ***-centralized production of hydrogen peroxide(h_(2)O_(2))from water and oxygen of air is highly desirable for daily life and *** report an effective electrochemical refinery(e-refinery)for h_(2)O_(2)by means of electrocatalysis-controlled comproportionation reaction(2_(h)O+o→2hO),feeding pure water and oxygen *** nickel(Ⅱ)oxide(NiO)was used as electrocatalyst for oxygen evolution reaction(OER),producing oxygen at the *** polymer poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate)(PEDOT:PSS)drove the oxygen reduction reaction(ORR),forming h_(2)O_(2)on the *** reactions were evaluated in both half-cell and device *** performance of the h_(2)O_(2)e-refinery,assembled on anion-exchange solid electrolyte and fed with pure water,was limited by the unbalanced ionic *** of the operation conditions allowed a conversion efficiency of 80%.

关键词： conducting polymer hydrogen peroxide nickel(Ⅱ)oxide oxygen evolution reaction oxygen reduction reaction

A Finite Element Method for Modelling Electromechanical wave Propagation in Anisotropic Piezoelectric Media

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Communications in Computational Physics 2007年第2期2卷 271-292页

作者： S.Rahman h.P.Langtangen C.h.w.barnes Cavendish Laboratory Cambridge UniversityJ J Thomson AvenueCambridgeCB3 OHEUnited Kingdom Simula Research Laboratory Martin Linges v 17Fornebu P.O.Box 1341325 LysakerNorway

we describe and evaluate a numerical solution strategy for simulating surface acoustic waves(SAws)through semiconductor devices with complex *** multi-physics problem is of particular relevance to the design of SAw-based quantum electronic *** mathematical model consists of two coupled partial differential equations for the elastic wave propagation and the electric field,respectively,in anisotropic piezoelectric *** equations are discretized by the finite element method in space and by a finite difference method in *** latter method yields a convenient numerical decoupling of the governing *** describe how a computer implementation can utilize the decoupling and,via object-oriented programming techniques reuse independent codes for the Poisson equation and the linear time-dependent elasticity *** we apply the simulator to a simplified model problem for verifying the implementation,and thereafter we show that the methodology is capable of simulating a real-world case from nanotechnology,involving SAws in a geometrically non-trivial device made of Gallium ***:***,***,*** Key words:Finite element method,piezoelectric surface acoustic waves,Gallium Arsenide.

关键词： Finite element method piezoelectric surface acoustic waves Gallium Arsenide.

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八十年代重型载重车用柴油机的发展趋向

世界汽车 1982年第1期 1-8页

作者： h.w.barnes-Moss 吕铁山

引言在柴油机的发展历程中,提高经济性一直是设计人员追求的主要目标,但七十年代以来颁布了一系列有关汽车的限制法规,它对汽车柴油机的发展有着深远的影响,同时世界性的能源问题也对柴油机的燃油经济性提出了新的更高的要求,而从减少... 详细信息

引言在柴油机的发展历程中,提高经济性一直是设计人员追求的主要目标,但七十年代以来颁布了一系列有关汽车的限制法规,它对汽车柴油机的发展有着深远的影响,同时世界性的能源问题也对柴油机的燃油经济性提出了新的更高的要求,而从减少使用费用出发也对柴油机的使用可靠性、维护方便性提出了更高的要求,这些因素决定了汽车柴油机的发展方向。

关键词：发动机功率汽车总重比功率载重车直喷式柴油机涡轮增压器重型载重汽车重型卡车八十年代

Stability of freeze-dried ph-responsive dextrin nanogels containing doxorubicin

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Asian Journal of Pharmaceutical Sciences 2016年第5期11卷 648-654页

作者： Somkamol Manchun crispin R.Dass Pornsak Sriamornsak Department of Pharmaceutical Technology Faculty of PharmacySilpakorn UniversityNakhon Pathom 73000Thailand Pharmaceutical Biopolymer Group(PBiG) Faculty of PharmacySilpakorn UniversityNakhon Pathom 73000Thailand School of Pharmacy Faculty of Health SciencesCurtin UniversityPerth 6845Australia Curtin health Innovation Research Institute of Ageing and Chronic Disease Bentley 6102Australia

Induction of non-specific toxicities by doxorubicin(DOX) has restricted conventional DOXbased chemotherapy. p h-responsive dextrin nanogels(DNGs) have been fabricated in order to incorporate and deliver DOX to specific(targeted) sites. however, adequate stability studies of DOX-loaded DNGs are required for selection of storage conditions. The aim of this study was therefore to evaluate the accelerated(25 °C/60% Rh) and long-term(5 °C) stability of DNGs prepared with formaldehyde(FDNGs) and glyoxal(GDNGs) as cross-linker by determining the change in their physicochemical properties. The mean diameter decreased with time during long-term storage. The drug content between freshly prepared(initial day) and after storage at 5 °C for 180 days of DOX-loaded FDNGs and DOX-loaded GDNGs was not significantly different(p > 0.05), but decreased after storage under the accelerated condition. The release of DOX from all DNGs was ph-dependent. however, DNGs kept under the accelerated condition showed higher amount of DOX release than those stored at 5 °C and the freshly prepared ones. The results indicate that the stability of DNGs could be improved by their storage at 5 °C.

关键词： Stability Nanogels Dextrin

Ground-based and additional science support for SMILE

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Earth and Planetary Physics 2024年第1期8卷 275-298页

作者： J.A.Carter M.Dunlop C.Forsyth K.Oksavik E.Donovon A.Kavanagh S.E.Milan T.Sergienko R.C.Fear D.G.Sibeck M.Connors T.Yeoman X.Tan M.G.G.T.Taylor K.Mcwilliams J.Gjerloev R.barnes D.D.Billet G.Chisham A.Dimmock M.P.Freeman D.-S.han M.D.hartinger S.-Y.w.hsieh Z.-J.hu M.K.James L.Juusola K.Kauristie E.A.Kronberg M.Lester J.Manuel J.Matzka I.McCrea Y.Miyoshi J.Rae L.Ren F.Sigernes E.Spanswick K.Sterne A.Steuwer T.Sun M.-T.walach B.walsh C.wang J.weygand J.wild J.Yan J.Zhang Q.-h.Zhang Planetary Sciences Group School of Physics and AstronomyUniversity of LeicesterUniversity RoadLeicesterLE17RHUK Rutherford Appleton Laboratory Space Science Technology Facilities CouncilOxfordshireUK School of Space and Environment Beihang UniversityBeijing 100191China Key Laboratory of Space Environment Monitoring and Information Processing Ministry of Industry and Information TechnologyBeijing 100017China Department of Space and Climate Physics UCLMullard Space Science LaboratoryHolmbury St.MaryDorkingSurreyRH56NTUK Birkeland Centre for Space Science Department of Physics and Technology.University of BergenBergenNorway Department of Physics and Astronomy University of Calgary2500 University DriveCalgaryAlbertaCanada T2N 1N4 British Antarctic Survey CambridgeUK Swedish Institute of Space Physics KirunaSweden west highfield Campus University of SouthamptonUniversity RoadSO171BJUK Goddard Space Flight Center NASAGreenbeltMarylandUSA Athabasca University AthabascaCanada ESTEC European Space AgencyNetherlands University of Saskatchewan SaskatoonCanada The Johns hopkins University Applied Physics Laboratory LaurelMarylandUSA Swedish Institude of Space Physics UppsalaSE 75121Sweden Tongji University Shanghai 200092China Center for Space Plasma Physics Space Science Institute4765 Walnut Street Suite BBoulderColorado80301USA Polar Research Institute of China Shanghai 200136China Finnish Meteorological Institute(FMI) Finland Department of Earth and Environmental Sciences(Geophysics) Ludwig Maximilian University of Munich(LMU)MunichTheresienstr.41MunichD-80333Germany Canadian Space Agency MontrealCanada GFZ German Research Centre for Geosciences PotsdamGermany Nagoya University Institute for Space Earth Environment ResearchCenter for Integrated Data ScienceNagoyaAichiJP 464-8601 Northumbria University Newcastle upon TyneTyne and WearUK NE18ST National Space Science Center Chinese Academy SciencesBeijing 100190China Arctic Geophysics University Centre in Svalbard

The joint European Space Agency and Chinese Academy of Sciences Solar wind Magnetosphere Ionosphere Link Explorer(SMILE)mission will explore global dynamics of the magnetosphere under varying solar wind and interplanetary magnetic field conditions,and simultaneously monitor the auroral response of the Northern hemisphere *** these large-scale responses with medium and fine-scale measurements at a variety of cadences by additional ground-based and space-based instruments will enable a much greater scientific impact beyond the original goals of the SMILE ***,we describe current community efforts to prepare for SMILE,and the benefits and context various experiments that have explicitly expressed support for SMILE can offer.A dedicated group of international scientists representing many different experiment types and geographical locations,the Ground-based and Additional Science working Group,is facilitating these *** include constructing an online SMILE Data Fusion Facility,the discussion of particular or special modes for experiments such as coherent and incoherent scatter radar,and the consideration of particular observing strategies and spacecraft *** anticipate growing interest and community engagement with the SMILE mission,and we welcome novel ideas and insights from the solar-terrestrial community.

关键词： magnetosphere ionosphere magnetosphere-ionosphere coupling ground-based experimentation SMILE conjunctions missions

Chemical Solution Deposition of YBa2Cu3O7 Films on YSZ （100） Substrates

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Journal of Chemistry and Chemical Engineering 2014年第6期8卷 547-551页

作者： henry Elías Sanchez Comejo Angel Bustamante Dominguez1 Ana María Osorio Luis De Los Santos Valladares José Albino Aguiar crispin h. w. barnes Ceramics and Nanomaterials Laboratory Department of Physics Major National University of San Marcos Lima 14-0149 Peru Department of Chemistry and Chemical Engineering Major National University of San Marcos Lima 14-0149 Peru Superconductivity and Advanced Materials Laboratory Department of Physics Federal University of Pernambuco Recife50670-901 Brazil Cavendish Laboratory Department of Physics University of Cambridge Cambridge CB3 0HE United Kingdom

we report the epitaxial growth of YBCO （YBa2Cu3O7） films on YSZ （Yttria-stabilized Zirconia）（100） substrates by chemical solution deposition. The precursor solution was prepared by dissolving stoichiometric amounts of acetates of Y（OOCCh3）3·4h2O, Ba（OOCCh3）2 and Cu（OOCCh3）·2h2O in an aqueous solution of oxalic acid （h2C2O4） and following the sol-gel route. This solution was directly dripped onto YSZ （100） substrates with the help of a Fisher pipette. To form the YBCO film, the sample was crystallized by annealing at 860 ℃ for 12 h in an oxidizing atmosphere. The characterization was performed by XRD （X-ray diffraction） analysis which revealed high intensity （001） reflections and denoted that most of the grains were c-axis oriented. Randomly oriented grains and other phases such as Y2BaCuO5 and CuO were also detected. The superconducting YBCO phase is demonstrated from the susceptibility versus temperature measurements which indicate a superconducting critical temperature ≈ 90 K. In addition, a surface morphology analysis was performed by optical microscopy and atomic force microscopy which revealed an average roughness of 0.2197 μm.

关键词： Sol-gel method epitaxial growth YBCO superconductor layers.

CDC7 inhibition impairs neuroendocrine transformation in lung and prostate tumors through MYC degradation

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Signal Transduction and Targeted Therapy 2024年第8期9卷 3519-3532页

作者： Alvaro Quintanal-Villalonga Kenta Kawasaki Esther Redin Fathema Uddin Swanand Rakhade Vidushi Durani Amin Sabet Moniquetta Shafer wouter R.Karthaus Samir Zaidi Yingqian A.Zhan Parvathy Manoj harsha Sridhar Dennis Kinyua hong Zhong Barbara P.Mello Metamia Ciampricotti Umesh K.Bhanot Irina Linkov Juan Qiu Radhika A.Patel Colm Morrsey Sanjoy Mehta Jesse barnes Michael C.haffner Nichlas D.Socci Richard P.Koche Elisa de Stanchina Sonia Molina-Pinelo Sohrab Salehi helena A.Yu Joseph M.Chan Charles M.Rudin Department of Medicine Thoracic Oncology ServiceMemorial Sloan Kettering Cancer CenterNew YorkNYUSA Cancer Biology and Genetics Program Sloan Kettering InstituteMemorial Sloan Kettering Cancer CenterNew YorkNYUSA Vagelos College of Physicians and Surgeons Columbia UniversityNew YorkNYUSA weill Cornell Graduate School of Medical Sciences Weill Cornell MedicineNew YorkNYUA human Oncology and Pathogenesis Program Memorial Sloan Kettering Cancer CenterNew YorkNYUSA Center for Epigenetics Research Memorial Sloan Kettering Cancer CenterNew YorkNYUSA Pathology Core Facilty Department of Pathology and Laboratory MedicineMSKCCNew YorkNYUSA Antitumor Assessment Core Memorial Sloan Kettering Cancer CenterNew YorkNYUSA Divisionsof human Biology and Clinical Research Fred Hutchinon Cancer CenterSeattleWAUSA Deparmentof Urology University of WashingtonSeattleWAUSA Gene Editing&Screening Core Facility Memorial Sloan Kettering Cancer Center New YorkNYUSA Department of Laboratory Medicine and Pathology University of WashingtonSeattleWAUSA Bioinfomatics CoreFacility Memorial Soan Kettering Cancer CenterNew YorkNYUSA Institute of Biomedicine of Seille(Bis) HURCSCUniversidad de SevillaSevilleSpain Computational Oncology Department of Epidemiology and BiostatisticsMemorial Sloan Kettering Cancer CenterNew YorkNYUSA well Cornell Medical College New York NYUSA Present address:Swiss Institute for Experimental Cancer Research(ISREC) School of Life SciencesEPFLLausanneSwitzerland

Neuroendocrine(NE)transformation is a mechanism of resistance to targeted therapy in lung and prostate adenocarcinomas leading to poor *** to date,even if patients at high risk of transformation can be identified by the occurrence of Tumor Protein P53(TP53)and Retinoblastoma Transcriptional Corepressor 1(RB1)mutations in their tumors,no therapeutic strategies are available to prevent or delay histological *** of the cell cycle kinase Cell Division Cycle 7(CDC7)occurred in tumors during the initial steps of NE transformation,already after TP53/RB1 co-inactivation,leading to induced sensitivity to the CDC7 inhibitor ***7 inhibition suppressed NE transdifferentiation and extended response to targeted therapy in in vivo models of NE transformation by inducing the proteasome-mediated degradation of the MYC Proto-Oncogen(MYC),implicated in stemness and histological *** overexpression of a degradation-resistant MYC isoform reestablished the NE transformation phenotype observed on targeted therapy,even in the presence of ***7 inhibition also markedly extended response to standard cytotoxics(cisplatin,irinotecan)in lung and prostate small cell carcinoma *** results nominate CDC7 inhibition as a therapeutic strategy to constrain lineage plasticity,as well as to effectively treat NE tumors de novo or after *** simurosertib clinical efficacy trials are ongoing,this concept could be readily translated for patients at risk oftransformation.

关键词： tumors markedly transformation

Towards electrochemical hydrogen storage in liquid organic hydrogen carriers via proton-coupled electron transfers

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Journal of Energy Chemistry 2022年第10期31卷 292-300,I0007页

作者： hamid Ghorbani Shiraz Mikhail Vagin Tero-Petri Ruoko Viktor Gueskine Krzysztof Karon Mieczystaw tapkowski Tobias Abrahamsson Thomas Ederth Magnus Berggren Xavier crispin Laboratory of Organic Electronics Department of Science and Technology(ITN)Linkoping UniversitySE-60174 NorrkopingSweden Smart Photonic Materials Facuty of Engineering and Natural SciencesTampere UniversiyPBox 541.Tampere Fl-33101Finland Silesian University of Technology.Faculty of Chemistry Deparment of Physical Chemistry and Technology of PolymersM.Strzody 9.44-100 GliwicePoland dDepartment of Physics Chemistry and Biology(IFM)Linkoping UniversiySE-58183 LinkopingSweden

Green hydrogen is identified as one of the prime clean energy carriers due to its high energy density and a zero emission of CO_(2).A possible solution for the transport of h_(2)in a safe and low-cost way is in the form of liquid organic hydrogen carriers(LOhCs).As an alternative to loading LOhC with h_(2)via a two-step procedure involving preliminary electrolytic production of h_(2)and subsequent chemical hydrogenation of the LOhC,we explore here the possibility of electrochemical hydrogen storage(EhS)via conversion of proton of a proton donor into a hydrogen atom involved in covalent bonds with the LOhC(R)via a protoncoupled electron transfer(PCET)reaction:2nh^(+)+2ne^(-)+Rox■n h_(2)^(0)*** chose 9-fluorenone/fluorenol(Fnone/Fnol)conversion as such a model PCET *** electrochemical activation of Fnone via two sequential electron transfers was monitored with in-situ and operando spectroscopies in absence and in presence of different alcohols as proton donors of different reactivity,which enabled us to both quantify and get the mechanistic insight on *** possibility of hydrogen extraction from the loaded carrier molecule was illustrated by chemical activation.

关键词： Proton-coupled electron transfer Electrochemical hydrogen storage hydrogen bonding agent Anion-radical Comproportionation