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Oil-water interfacial tension, wettability alteration and foaming studies of natural surfactant extracted from Vernonia Amygdalina

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Petroleum Research 2022年第3期7卷 350-356页

作者： Happiness Imuetinyan Augustine Agi Afeez Gbadamosi Radzuan Junin jeffrey Osehd Department of Petroleum Engineering College of Engineering and TechnologyFederal University of Petroleum ResourcesEfurunNigeria Department of Petroleum Engineering School of Chemical and Energy EngineeringFaculty of EngineeringUniversiti Teknologi Malaysia81310Skuda JohorMalaysia Center for Integrative Petroleum Research King Fahd University of Petroleum and MineralsDhahran31262Saudi Arabia Department of Petroleum Engineering Federal University of Technology OwerriNigeria

Surfactant flooding is an enhanced oil recovery(EOR)method for recovering residual oil in the reservoir through mechanism of interfacial tension(IFT)reduction and wettability *** to toxicity and high cost associated with conventional surfactants,recent research has focussed on developing low-cost and environmentally benign ***,a low-cost green surfactant is extracted from Vernonia Amygdalina(VA)and appraised for EOR *** extracted surfactant was characterized using Fourier Transform Infrared(FTIR)and High-Pressure Liquid Chromatography(HPLC).The IFT of the synthesized surfactant at the oil-water interface was determined using Kruss ***,the foam stability of the synthesized surfactant was ***,the wettability of the saponin based natural surfactant(SBNS)at the rock-fluid interface was analysed using Dataphysics drop shape *** result revealed that SBNS(1 wt%concentration)stabilized foam for longer periods with half-life of 1100 ***,the synthesized surfactant was effective in lowering the IFT of oil-water interface from 18 mN/m to 0.97 mN/***,SBNS altered the wettability of sandstone cores to water-wetting condition by reducing the contact angle from 118.5° to 45.7°.Overall,SBNS exhibit excellent properties desirable for EOR and thereby recommended as supplementary alternative to conventional surfactants.

关键词： Enhanced oil recovery Surfactant Interfacial tension Wettability Saponin Foam

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Sheeted Dike Complexes in Contemporary Oceanic Crust: Implications for Spreading Processes and the Interpretation of Ophiolites

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Acta Geologica Sinica(English Edition) 2016年第S1期90卷 202-203页

作者： jeffrey A.KARSON Department of Earth Sciences Syracuse University

As anticipated from studies of ophiolite complexes,direct investigations of the oceanic crust confirm that basaltic dikes are an integral part of the upper 2 km of the oceanic *** available information suggests

关键词： Sheeted Dike Complexes in Contemporary Oceanic Crust Implications for Spreading Processes and the Interpretation of Ophiolites

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Amplitude-mode spectroscopy of chemically injected and photogenerated charge carriers in semiconducting single-walled carbon nanotubes

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Nano Research 2023年第4期16卷 5619-5625页

作者： Shai R。Vardeny Alan Phillips Kira A。Thurman ZValy Vardeny jeffrey L.Blackburn Division of Electrical Electronicand Infocommunications EngineeringOsaka University2-1 Yamada-okaSuitaOsaka 565-0871Japan Materials Chemistryand Computation Science DirectorateNational Renewable Energy LaboratoryGoldenCO 80401USA Department of Physics Colorado School of MinesGoldenCO 80401USA Department of Physics&Astronomy University of UtahSalt Lake CityUT 84112USA

In one-dimensional semiconductors such as conjugated polymers and semiconducting single-walled carbon nanotubes(s-SWCNTs),injected charge carriers(electrons or holes)can have profound impacts on both electronic conductivity and optical spectra,even at low carrier *** charge-related spectral features is a key fundamental challenge with important technological ***,we employ a systematic suite of experimental and theoretical tools to understand the mid-infrared charge signatures of heavily p-type doped polymer-wrapped *** a broad range of nanotube diameters,we find that hole charge carriers induce strong Fano anti-resonances in mid-infrared transmission spectra that correspond to defect-related(D-band)and in-plane tangential(G-band)Raman-active vibrational modes,along with antiresonances arising from infrared(IR)-active polymer and SWCNT *** employ^(13)C isotope-labeled s-SWCNTs and a removable wrapping polymer to clarify the relative intensities,energies,and sources of all observed *** performed with the“amplitude mode model”are used to quantitatively reproduce Raman spectra and also help to explain the outsized intensity of the D-band anti-resonance,relative to the G-band,observed for both moderately and degenerately doped *** results provide a framework for future studies of ground-and excited-state charge carriers in s-SWCNTs and a variety of low-dimensional materials.

关键词： carbon nanotubes doping charge carriers phonons electron-phonon coupling

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Chemically activated carbon nanofibers for adsorptive removal of bisphenol-A:Batch adsorption and breakthrough curve study

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Chinese Journal of Chemical Engineering 2023年第9期61卷 248-259页

作者： Wenming Hao Basma I.Waisi Timothy M.Vadas jeffrey R.McCutcheon College of Chemical Engineering and Technology Taiyuan University of TechnologyTaiyuan 030024China Department of Chemical&Biomolecular Engineering University of ConnecticutStorrsCT 06269United States Department of Chemical Engineering University of BaghdadBaghdad 10071Iraq Department of Civil and Environmental Engineering University of ConnecticutStorrsCT 06269United States

Activated carbon nanofibers(ACNFs)with small diameter can significantly increase the accessibility of intra pores and accelerate adsorption of molecules from *** this study,ACNFs were made by blending K_(2)CO_(3)or ZnCl_(2)as the activating agent into the polyacrylonitrile(PAN)in dimethylformamide solution for electrospinning prior to ***-A(BPA),an endocrine disruption pollutant,is widely applied in the production of polycarbonate plastics and epoxy ***,BPA is often used as a model contaminant commonly removed via *** adsorption studies were used to evaluate the kinetics and adsorption capacity of the ***-Peterson(R-P)and Langmuir models were found to fit the isotherm of BPA adsorption better than Freundlich model,showing the homogeneous nature of the PAN originated *** adsorption kinetics was better described by the pseudo second-order model than that by the pseudo first-order *** fitting by intraparticle diffusion model indicates the adsorption of BPA onto ACNFs is mainly controlled by pore *** pH value and ionic strength reduced BPA adsorption from aqueous *** breakthrough curves studied in two different fixed bed systems(cross flow bed system and packed flow bed system)confirmed the scalability of BPA removal by ACNFs in dynamic adsorption *** modified dose-response model predicted well the fixed-bed outlet concentration profiles.

关键词： Activated carbon nanofibers(ACNFs) Chemical activation Bisphenol-A(BPA) Fixed bed Adsorption

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Pearling and helical nanostructures of model protocell membranes

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Nano Research 2022年第1期15卷 659-668页

作者： Zhidi Chen Yaxun Fan Yao Chen jeffrey Penfold Peixun Li Rongliang Wu Yilin Wang CAS Key Laboratory of Colloid Interface and Chemical ThermodynamicsBeijing National Laboratory for Molecular Sciences(BNLMS)CAS Research/Education Center for Excellence in Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China ISIS STFCy Rutherford Appleton LaboratoryChiltonDidcotOxon OX110QXUK College of Material Science and Engineering State Key Laboratory for Modification of Chemical Fibers and Polymer MaterialsDonghua UniversityShanghai 201620China

The diversity of protocell membrane structures is crucial for the regulation of cell activities and indispensable to the origin of *** to the evolution of complex cellular machinery,spontaneous protocell membrane evolution results from the intrinsic physicochemical properties of simple molecules under specific environmental ***,we report the evolution of the morphology of cell-sized model protocell membranes from giant vesicles to pearling and helical nanostructures,resembling morphologies of eukaryocytes,nostoc,and *** evolution occurs in a single binary aqueous system composed of an achiral single-chain amphiphile and a biogenic polyamine(spermidine or spermine)upon evaporating water,feeding amphiphiles,or increasing pH in response to various primitive fluctuating *** contrast,nonbiogenic polyamines(triamine,triethylenetetramine,and hexamethyltriethylenetetramine)with slight differences in the number of methylene groups or protonated amine groups do not induce such a kind of *** evolution of the shape transformation strongly relies on the balance between electrostatic attraction and hydrogen bonding,attributed to the odd/even effect of polyamines in the ***,both pearling and helical structures emerge from multilamellar vesicles undergoing different processes,where the helix shows stronger permeability and encapsulation capability due to its multicompartmentalized ***,subtle adjustment of weak intramolecular interactions not only yields significant changes in the morphological evolution of protocell membranes but also brings new insights into the natural inevitability of biogenic small molecules.

关键词： protocell membrane pearling and helical nanostructures morphology evolution biogenic polyamine amphiphile self-assembly

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The August 14, 2003 blackout andits importance to China

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华东电力 2004年第1期32卷 2-6页

作者： By P. jeffrey Palermo Executive Consultant KEMA Inc

本文作者P .jeffreyPaleimo先生系美国KEMA公司的资深电力专家 ,2 0 0 4年 1月在上海就美加8·14大停电事故及中国电网的安全运行同我国同行进行了交流、探讨。首篇刊出特邀P jeffreyPaleimo就8·14美加大停电原因、涉及的电力体制以及... 详细信息

本文作者P .jeffreyPaleimo先生系美国KEMA公司的资深电力专家 ,2 0 0 4年 1月在上海就美加8·14大停电事故及中国电网的安全运行同我国同行进行了交流、探讨。首篇刊出特邀P jeffreyPaleimo就8·14美加大停电原因、涉及的电力体制以及中国和亚洲的电力市场应引以为鉴作了专题论述。结合美国国内的各新闻报道和评论 ,以美加大停电特别工作小组的中期报告作为依据 ,归纳了大停电发生的原因 ,特别指出美国现行电力体制中出现的对长距离输电时的地区由于协调控制薄弱 ,增加了发生大停电的可能性。指出 ,在中国东部地区 ,国民经济每年以 10 %以上的速度发展 ,对电力系统发展具有很高的要求是必然的 ,因而对现有电力系统要不断重新评估分析 ,设计中要考虑隔离点 (breakpoints) ,保证必要时以孤岛模式运行。

关键词：电力系统电网安全运行停电事故

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Transfusion trigger:how low can you go?

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中国输血杂志 2012年第10期25卷 917-918页

作者： jeffrey L.Carson UMDNJ-Robert Wood Johnson Medical School New BrunswickNew JerseyUSA

Approximately 12 million red blood cell (RBC)200 cc units are transfused annually in the China and about 85 million RBC units ***,there is widespread variation in transfusion practice.1,2 The most likely reason is that there has been limited high quality evidence to guide *** recent years there has been publication of several important clinical trials that expand the data informing the transfusion decision.

关键词：输血触发红血细胞临床试验 RBC 单位

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A database of modeled gridded dry deposition velocities for 45 gaseous species and three particle size ranges across North America

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Journal of Environmental Sciences 2023年第5期127卷 264-272页

作者： Leiming Zhang Zhuanshi He Zhiyong Wu Anne Marie Macdonald jeffrey R.Brook Shailesh Kharol Air Quality Research Division Science and Technology BranchEnvironment and Climate Change CanadaTorontoON M3H 5T4Canada Department of Chemical Engineering and Applied Chemistry University of TorontoTorontoON M5S 2E4Canada

The dry deposition process refers to the flux loss of an atmospheric pollutant due to uptake of the pollutant by the earth’s *** deposition flux of a chemical species is typically calculated as the product of its surface-layer concentration and its dry deposition velocity(V_(d)).Field measurement based V_(d) data are very scarce or do not exist for many chemical species considered in chemistry transport *** the present study,gaseous and particulate dry deposition schemes were applied to generate a database of hourly V_(d) for 45 gaseous species and three particle size ranges for two years(2016–2017)at a 15 kmby 15 km horizontal resolution across North *** V_(d) of the 45 gaseous species ranged from<0.001 to 4.6 cm/sec across the whole domain,with chemical species-dependentmedian(mean)values being in the range of 0.018–1.37 cm/sec(0.05–1.43 cm/sec).The spatial distributions of the two-year average V_(d) showed values higher than 1–3 cm/sec for those soluble and reactive species over certain land *** species have the highest V_(d) over water surfaces,while insoluble but reactive species have the highest V_(d) over *** V_(d) of PM_(2.5) across the whole domain ranged from 0.039 to 0.75 cm/sec with median(mean)value of 0.18(0.20)cm s^(−1),while the mean V_(d) for PM_(2.5)–10 is twice that of PM_(2.5).Uncertainties in the modeled V_(d) are typically on the order of a factor of 2.0 or larger,which needs to be considered when applying the dataset in other studies.

关键词： Air quality modeling Atmospheric pollutant Atmospheric deposition Dry deposition velocity Spatiotemporal distribution

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Microenvironmental influences on T cell immunity in cancer and inflammation

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Cellular & Molecular Immunology 2022年第3期19卷 316-326页

作者： Darren R.Heintzman Emilie L.Fisher jeffrey C.Rathmell Department of Pathology Microbiologyand ImmunologyVanderbilt University Medical CenterNashvilleTN37205USA Vanderbilt Center for Immunobiology Vanderbilt University Medical CenterNashvilleTN37205USA

T cell metabolism is dynamic and highly *** the intrinsic metabolic programs of T cell subsets are integral to their distinct differentiation and functional patterns,the ability of cells to acquire nutrients and cope with hostile microenvironments can limit these pathways.T cells must function in a wide variety of tissue settings,and how T cells interpret these signals to maintain an appropriate metabolic program for their demands or if metabolic mechanisms of immune suppression restrain immunity is an area of growing *** in inflamed and cancer tissues,a wide range of changes in physical conditions and nutrient availability are now acknowledged to shape *** include fever and increased temperatures,depletion of critical micro and macro-nutrients,and accumulation of inhibitory waste *** we review several of these factors and how the tissue microenvironment both shapes and constrains immunity.

关键词： immunometabolism T cell microenvironment cancer inflammation

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Code modernization and modularization of APEX and SWAT watershed simulation models

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International Journal of Agricultural and Biological Engineering 2015年第3期8卷 81-94页

作者： Robin A.J.Taylor Jaehak Jeong Michael White jeffrey G.Arnold Blackland Research&Extension Center Texas A&M AgriLife ResearchTempleTexas 76502USA Grassland Soil&Water Research Laboratory USDA-ARS TempleTexas 76502USA

SWAT(Soil and Water Assessment Tool)and APEX(Agricultural Policy/Environmental eXtender)are respectively large and small watershed simulation models derived from EPIC(Environmental Policy Integrated Climate),a field-scale agroecology simulation *** three models are coded in Fortran and have evolved over several *** are widely used to analyze anthropogenic influences on soil and water quality and *** of the original Fortran code has been retained even though Fortran has been through several cycles of *** now provides functionality originally restricted to languages like C,designed to communicate directly with the operating system and *** can now use an object-oriented style of programming in Fortran,including inheritance,run-time polymorphism and *** order to enhance their utility in research and policy-making,the models are undergoing a major revision to use some of the new Fortran *** these new programming paradigms the developers of SWAT,APEX,and EPIC are working to make communication between the two models *** paper describes the ongoing revision of these models that will make them easier to use,maintain,modify and *** is intended that they will converge as they continue to evolution,while maintaining their distinctive features,capabilities and identities.

关键词： code modernization modularization object-oriented programming Fortran 2008 landscape-scale models APEX EPIC SWAT

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