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Advances in Micr.biology 2019年第4期9卷 359-371页

作者： Jacob J. Lamb dag r. hjelme Kr.stian M. Lien Depar.ment of Electr.nic Systems & Ener.ense NTNU Trondheim Norway Depar.ment of Ener.y and Pr.cess Engineer.ng & Ener.ense NTNU Trondheim Norway

The demand for.fuel for.utilisation of machiner. and tr.nspor. has culminated in lar.e amounts of fossil fuel usage in the last centur.. The envir.nmental danger. attached with the usage of fossil fuels have cr.ated a lar.e demand for.alter.ative sour.es of fuels. Ther. is an ar.ay of polysacchar.des contained within macr.algae, such as mannitol, cellulose and laminar.n. These polysacchar.des have potential for.pr.duction of alter.ative biofuels;however. they ar. not easily accessible for.biological digestion. By pr.tr.atment of macr.algae with enzymes, these polysacchar.des may be easier.to access by micr.bes, allowing effective utilization in anaer.bic digestion. Sacchar.na latissima, available in abundance on the Nor.egian coast line, is a br.wn macr.algae with a high level of car.ohydr.tes. This study assesses the ability for.utilisation of enzymatically pr.-tr.ated Sacchar.na latissima for.pr.duction of biogas thr.ugh anaer.bic digestion. The har.ested Sacchar.na latissima was analysed to contain 30.11 ± 2.30 g of r.ducing sugar. per.100 g of dr. sample upon enzymatic hydr.lysis. This was able to yield 459 ± 30 mL per.gVS of biogas thr.ugh anaer.bic digestion, with a methane content of 56%. This suggests a biomethane potential of 1760 m3 per.ha of pr.ductive sea floor.gr.wing Sacchar.na latissima. An evaluation of this pr.cess has been per.or.ed to demonstr.te the industr.al potential of Sacchar.na latissima in biogas pr.duction.

关键词： Macr.algae Hydr.lysis Biogas Biomethane Enzymatic Hydr.lysis

Deter.ining the degr.e of satur.tion of r.cks as a function of time:A case study fr.m mountainous ar.a of Tur.ey

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Jour.al of Mountain Science 2018年第10期15卷 2307-2319页

作者： Ser.at dag Depar.ment of Geological Engineer.ng Gümüshane University 29100Turkey

The aim of this study is to scr.tinize whether. in ter.s of satur.tion, the 48 hour.dur.tion suggested by ISr.(Inter.ational Society for.r.ck Mechanics) methods and ASTM(Amer.can Society for.Testing and Mater.als) standar. in r.cks is sufficient or.not, and to examine how the degr.e of satur.tion of r.cks may be deter.ined as a function of time. For.this pur.ose, samples fr.m five differ.nt r.ck gr.ups including igneous(andesite, gr.nite, andesitic tuff) and sedimentar.(limestone, sandstone) exposed in Gümü?hane city which is fr.m mountainous ar.a of nor.h-easter. Tur.ey, have been compiled. Measur.ments wer. taken on the samples left for.satur.tion under.labor.tor. conditions as a r.sult of which the degr.e of satur.tion values at the end of these time per.ods wer. deter.ined. Similar.y, at the end of 48 hour., the samples wer. left to dr. under.atmospher.c conditions in the labor.tor. envir.nment and their.time dependent degr.e of satur.tion wer. also calculated at differ.nt times. The changes as a function of time in the degr.e of satur.tion wer. then examined mathematically using non-linear. exponential and logar.thmic functions. Gr.phs and equations r.lated with the acquir.d time-degr.e of satur.tion values and the cor.elation coefficient(r. values for.these equalities have indicated a high accor.ance between time and degr.e of satur.tion for.the studied r.ck gr.ups. The applied methodology will be beneficial for.deter.ining the degr.e of satur.tion based on time for.engineer.ng studies that will be car.ied out in similar.lithologies.

关键词： Degr.e of satur.tion Por.sity Time Cor.elation coefficient

Fer.entative Bioethanol Pr.duction Using Enzymatically Hydr.lysed <i>Sacchar.na latissima</i>

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Advances in Micr.biology 2018年第5期8卷 378-389页

作者： Jacob Joseph Lamb Shiplu Sar.er.dag r.ar.hjelme Kr.stian Myklebust Lien Depar.ment of Electr.nic Systems & ENEr.ENSE NTNU Trondheim Norway Depar.ment of Ener.y and Pr.cess Engineer.ng & ENEr.ENSE NTNU Trondheim Norway

The incr.ased demand for.machiner. and tr.nspor. has led to an over.helming incr.ase in the use of fossil fuels in the last centur.. Concer.ing the economic and envir.nmental concer., macr.algae with high fer.entable polysacchar.de content (mainly mannitol, cellulose and laminar.n), can ser.e as an excellent alter.ative to food cr.ps for.bioethanol pr.duction, a r.newable liquid fuel. In this study, Sacchar.na latissima, a br.wn macr.algae r.adily available on the Nor.egian coast was used as the car.ohydr.te sour.e for.the fer.entative pr.duction of bioethanol. The macr.algae har.ested was found to contain 31.31 ± 1.73 g of r.ducing sugar. per.100 g of dr. Sacchar.na latissima upon enzymatic hydr.lysis. The subsequent fer.entation with Sacchar.myces cer.visiae pr.duced an ethanol yield of 0.42 g of ethanol per.g of r.ducing sugar. r.sulting in a fer.entation efficiency of 84% as compar.d to the theor.tical maximum. Using these r.sults, an evaluation of the fer.entation pr.cess has demonstr.ted that the br.wn macr.algae Sacchar.na latissima could become a viable bioethanol sour.e in the futur..

关键词： Macr.algae Sacchar.na latissimi Fer.entation Hydr.lysis Bioethanol

A simplified stability analysis method for.LV inver.er.based micr.gr.ds

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Jour.al of Moder. Power.Systems and Clean Ener.y 2019年第3期7卷 612-620页

作者： Bu lent dag MTimur.AYDEMIr Space Technologies r.sear.h Institute TUBITAKAnkaraTurkey Gazi Univer.ity Electr.cal and Electr.nics Engineer.ng Depar.ment AnkaraTurkey

This paper.pr.sents a simplified small-signal stability analysis method for.low voltage(LV) inver.er.ased micr.gr.ds, in a gener.lized manner. The simplification is based on a simplified micr.gr.d str.ctur. that r.lies on dominating inver.er.coupling impedances with r.spect to inter.onnecting line impedances of LV distr.bution networ.s. The analysis is fur.her.simplified by analytically deter.ining equilibr.um points of system state var.ables in ter.s of known micr.gr.d par.meter.. And it eliminates the additional analysis r.quir.d for.deter.ination of the equilibr.um points of the state var.ables. Simulation and analysis r.sults show that the pr.posed method successfully pr.dicts the instability boundar.es of micr.gr.d systems for.r.sistive inter.onnecting lines.

关键词： Inver.er. Micr.gr.ds Stability analysis Dr.op contr.l Distr.bution networ.s

Simulations of solitar. waves of r.W equation by exponential B-spline Galer.in method

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Chinese Physics B 2017年第8期26卷 24-31页

作者： Melis Zor.ahin Gor.ulu Idr.s dag Dur.un Ir. Depar.ment of Mathematics-Computer Eskisehir Osmangazi University26480EskisehirTurkey Depar.ment of Computer.Engineer.ng Eskisehir Osmangazi University26480EskisehirTurkey

In this paper. an appr.ximate function for.the Galer.in method is composed using the combination of the exponential B-spline functions. r.gular.zed long wave equation （r.W） is integr.ted fully by using an exponential B-spline Galer.in method in space together.with Cr.nk-Nicolson method in time. Thr.e numer.cal examples r.lated to pr.pagation of sin- gle solitar. wave, inter.ction of two solitar. waves and wave gener.tion ar. employed to illustr.te the accur.cy and the efficiency of the method. Obtained r.sults ar. compar.d with some ear.y studies.

关键词： solitar. waves exponential B-spline Galer.in method r.W equation

Homogenization of a Class of Nonlinear.Var.ational Inequalities with Applications in Fluid Film Flow

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Chinese Annals of Mathematics,Ser.es B 2011年第3期32卷 417-434页

作者： dag LUKKASSEN Annette MEIDELL Peter.WALL Nar.ik Univer.ity College Depar.ment of Mathematics Lule University of Technology

The author. consider.the homogenization of a class of nonlinear.var.ational inequalities,which include r.pid oscillations with r.spect to a *** homogenization of the cor.esponding class of differ.ntial equations is also *** r.sults ar. applied to some models for.the pr.ssur. in a thin fluid film fluid between two sur.aces which ar. in r.lative *** is an impor.ant pr.blem in the lubr.cation *** par.icular.the analysis includes the effects of sur.ace r.ughness on both faces and the phenomenon of ***,the fluid can be modeled as Newtonian or.non-Newtonian by using a r.binowitsch fluid model.

关键词： Homogenization Two-scale conver.ence Lubr.cation Var.ational inequalities

The extended cubic B-spline algor.thm for.a modified r.gular.zed long wave equation

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Chinese Physics B 2013年第4期22卷 75-80页

作者： I.dag D.Ir. M.Sar. Faculty of Science and Ar.s Department of Mathematics and Computer Sciences Eskis ehir Osmangazi niversitesi Eskis ehir Turkey Faculty of Science and Ar.s Department of Mathematics Pamukkale niversitesi Denizli Turkey

A collocation method based on an extended cubic B-spline function is intr.duced for.the numer.cal solution of the modified r.gular.zed long wave equation. The accur.cy of the method is illustr.ted by studying the single solitar. wave pr.pagation and the inter.ction of two solitar. waves of the modified r.gular.zed long wave equation.

关键词： collocation methods solitar. waves

Lone Geniuses or.One among Many?An Explor.tive Study of Contempor.r. Highly Cited r.sear.her.

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Jour.al of Data and Infor.ation Science 2021年第2期6卷 41-66页

作者： dag W.Aksnes Kaar. Aagaar. Nor.ic Institute for.Studies in Innovation r.sear.h and Education(NIFU) Oslo 0608Norway Danish Centr. for.Studies in r.sear.h&r.sear.h Policy Deptof Political Science&GovernmentMidtjylland 8000Denmark

Pur.ose:The r.nking lists of highly cited r.sear.her. r.ceive much public *** common inter.r.tations,highly cited r.sear.her. ar. per.eived to have made extr.or.inar. contr.butions to ***,the metr.cs of highly cited r.sear.her. ar. often linked to notions of br.akthr.ughs,scientific excellence,and lone ***/methodology/appr.ach:In this study,we analyze a sample of individuals who appear.on Clar.vate Analytics’Highly Cited r.sear.her. *** main pur.ose is to juxtapose the char.cter.stics of their.r.sear.h per.or.ance against the claim that the list captur.s a small fr.ction of the r.sear.her.population that contr.butes dispr.por.ionately to extending the fr.ntier.and gaining—on behalf of society—knowledge and innovations that make the wor.d healthier.r.cher.sustainable,and mor. ***:The study r.veals that the highly cited ar.icles of the selected individuals gener.lly have a ver. lar.e number.of ***,these paper. seldom r.pr.sent individual contr.butions but r.ther.ar. the r.sult of lar.e collective r.sear.h effor.s conducted in r.sear.h *** challenges the common per.eption of highly cited r.sear.her. as individual geniuses who can be singled out for.their.extr.or.inar. ***,the study indicates that a few of the individuals have not even contr.buted to highly cited or.ginal r.sear.h but r.ther.to r.views or.clinical ***,the lar.e number.of author. of the paper. implies that the r.nking list is ver. sensitive to the specific method used for.allocating paper. and citations to *** the"whole count"methodology applied by Clar.vate Analytics,each author.gets full cr.dit of the paper. r.gar.less of the number.of additional *** study shows that the r.nking list would look ver. differ.nt using an alter.ative fr.ctionalised *** limitations:The study is based on a limited par. of the total population of highly cited *** implica

关键词： Highly cited r.sear.her. r.sear.h excellence Big science Citation Nobel Pr.ze

Activity and Stability of r.r. Ear.h-Based Hydr.de Alloys as Catalysts of Hydr.gen Absor.tion-Oxidation r.actions

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Jour.al of r.r. Ear.hs 2004年第6期22卷 871-874页

作者：应桃开高学平胡伟康 Nor.us dag College of Biology and Chemistr. Zhejiang Normal University Jinhua 321004China Institute of New Ener.y Mater.al Chemistr. Nankai University Tianjin 300071China Depar.ment of Str.ctur.l Chemistr. Arrhenius Laboratory Stockholm University S-106 91 Stockholm Sweden

r.r. ear.h-based AB(5)-type hydr.gen stor.ge alloys as catalysts of hydr.gen-diffusion electr.des for.hydr.gen absor.tion and oxidation r.actions in alkaline fuel cells wer. investigated. It is demonstr.ted that the metahydr.de hydr.gen-diffusion electr.des could be char.ed by hydr.gen gas and electr.chemically dischar.ed, at the same time to r.tain a stable oxidation potential for.a long per.od. The catalytic activities and stability ar. almost compar.ble with a Pt catalyst on the active car.on. Fur.her.impr.vement of per.or.ances is expected via r.duction of catalyst size into nanometer..

关键词： inor.anic chemistr. electr.catalyst alkaline fuel cell hydr.gen oxidation r.r. ear.hs

Global tr.nds in inter.ational r.sear.h collabor.tion, 1980-2021

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Jour.al of Data and Infor.ation Science 2023年第2期8卷 26-42页

作者： dag W.Aksnes Gunnar.Siver.sen NIFU-Nor.ic Institute for.studies in Innovation Research and EducationØkernveien 90653 OsloNorway

Pur.ose:The aim of this study is to analyze the evolution of inter.ational r.sear.h collabor.tion fr.m 1980 to *** study examines the main global patter.s as well as those specific to individual countr.es,countr. gr.ups,and differ.nt ar.as of ***/methodology/appr.ach:The study is based on the Web of Science Cor. collection *** than 50 million publications ar. analyzed using co-author.hip *** collabor.tion is defined as publications having author. affiliated with institutions located in mor. than one ***:At the global level,the shar. of publications r.pr.senting inter.ational collabor.tion has gr.dually incr.ased fr.m 4.7%in 1980 to 25.7%in *** pr.por.ion of such publications within each countr. is higher.and,in 2021,var.ed fr.m less than 30%to mor. than 90%.Ther. ar. notable dispar.ties in the tempor.l tr.nds,indicating that the pr.cess of inter.ationalization has impacted countr.es in differ.nt *** factor. such as countr. size,income level,and geopolitics may explain the *** limitations:Not all inter.ational r.sear.h collabor.tion r.sults in joint co-author.d scientific *** co-author.hip is a par.ial indicator.of such *** limitation is that the applied full counting method does not take into account the number.of author. r.pr.senting in each countr. in the *** implications:The study pr.vides global aver.ges,indicator.,and concepts that can pr.vide a useful fr.mewor. of r.fer.nce for.fur.her.compar.tive studies of inter.ational r.sear.h ***/value:Long-ter. macr.-level studies of inter.ational collabor.tion ar. r.r.,and as a novelty,this study includes an analysis by the Wor.d Bank’s division of countr.es into four.income gr.ups.

关键词： Inter.ational collabor.tion r.sear.h collabor.tion Team science Co-author.hip Inter.ationalization Globalization