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FORECASTING EXCHANGE RATES: AN OPTIMAL APPROACH

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Journal of Systems Science & Complexity 2014年第1期27卷 21-28页

作者： BENEKI christina YARMOHAMMADI Masoud School of Business and Economics Department of Business Administration Technological Educational Instituteof Ionian Islands 31100 Lefkada Greece. Department of Statistics Payame Noor University 19395-4697 Tehran Islamic Republic of Iran.

This paper looks at forecasting daily exchange rates for the United Kingdom, European Union, and China. Here, the authors evaluate the forecasting performance of neural networks （NN）, vector singular spectrum analysis （VSSA）, and recurrent singular spectrum analysis （RSSA） for fore casting exchange rates in these countries. The authors find statistically significant evidence based on the RMSE, that both VSSA and RSSA models outperform NN at forecasting the highly unpredictable exchange rates for China. However, the authors find no evidence to suggest any difference between the forecasting accuracy of the three models for UK and EU exchange rates.

关键词： China European union exchange rates forecasting neural networks recurrent singularspectrum analysis United Kingdom vector singular spectrum analysis.

Electrochemical and spectroelectrochemical characterization of different mesoporous TiO2 film electrodes for the immobilization of Cytochrome c

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Frontiers of Materials Science 2018年第1期12卷 64-73页

作者： Stavros KATSIAOUNIS christina TIFLIDIS christina TSEKOURA Emmanuel TOPOGLIDIS Department of Materials Science University of Patras Rion 26504 Greece

In this work three different mesoporous TiO2 film electrodes were prepared and used for the immobilization of Cytochrome c （Cyt-c）. Films prepared via a standard sol-gel route （SG-films） were compared with commercially available benchmark nanotitania materials, namely P25 Degussa （P25-films） and Dyesol nanopaste （Dyesol films）. Their properties, film deposition characteristics and their abilities to adsorb protein molecules in a stable and functional way were examined. We investigated whether it is possible, rather than preparing TiO2 films using multistep, lengthy and not always reproducible sol-gel procedures, to use commercially available nanotitania materials and produce reproducible films faster that exhibit all the properties that make TiO2 films ideal for protein immobilization. Although these materials are formulated primarily for dye-sensitized solar cell applications, in this study we found out that protein immobilization is facile and remarkably stable on all of them. We also investigated their electrochemical properties by using cyclic voltammetry and spectroelectrochemistry and found out that not only direct reduction of Fe（III）-heme to Fe（II）-heme of immobilized Cyt-c was possible on all flms but that the adsorbed protein remained electroactive.

关键词： TiO2 films spectroelectrochemistry cyclic voltammetry Cytochrome c

Volatile and C-H-O isotopic compositions of giant Fe-Ti-V oxide deposits in the Panxi region and their implications for the sources of volatiles and the origin of Fe-Ti oxide ores

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Science China Earth Sciences 2012年第11期55卷 1782-1795页

作者： WANG christina Yan Key Laboratory of Mineralogy and Metallogeny Guangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhou 510640China

The Panzhihua,Hongge,and Baima Fe-Ti-V oxide deposits in the Panzhihua-Xichang(Panxi) region are hosted in large layered mafic-ultramafic *** layered intrusions intrude either the Neoproterozoic Dengying Formation,composed mainly of limestone,or the Paleoproterozoic Hekou Formation,composed of meta-sedimentary-volcanic *** remains unclear if the wall rocks have been involved during the fractionation of magmas and have affected the sequence of crystallization of Fe-Ti *** and their C-H-O isotopic compositions of magnetite,apatite,clinopyroxene,and plagioclase of different types of ores from the three intrusions are analyzed using a technique of stepwise heating mass spectrometer to evaluate the role of wall rocks in the formation of Fe-Ti oxide *** released from magnetite are composed mainly of H 2 O and CO 2,whereas the other minerals are composed mainly of H 2 O,CO 2 and H *** 800-1200°C temperature interval,the average 13 C values of CO 2 of all the minerals from the three intrusions range from 7.7‰ to 13.5‰ and the average 18 O CO 2 values from 19.1‰ to 19.5‰,which are scattered in a mixed field with basalt and the two types of wall rocks as end-members,indicating that CO 2 from the wall rocks may have been involved in the magmas from which the three intrusions *** 400-800 C temperature interval,both 13 C values(13.7‰ to 17.9‰ on the average) and 18 O values(16.2‰ to 19.2‰ on the average) of CO 2 of all the minerals are lower than those for 800-1200 C temperature interval,and much closer to the values of the wall *** H 2 O released at the 400-800 C temperature interval has relatively low D values ranging from 90‰ to 115‰,also indicating the involvement of fluids from the wall *** average bulk contents of volatiles released from magnetite of the Hongge,Baima,and Panzhihua intrusions are 4891,2996,and 1568 mm 3 STP/g,respectively,much higher than those released from other minerals in total,which are 382

关键词： magnetite volatiles C-H-O isotope Fe-Ti-V oxide ore Panxi region

Neural plasticity in Parkinson's disease:a neuroimaging perspective

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Neural Regeneration Research 2024年第6期19卷 1203-1205页

作者： christina Andica Koji Kamagata Department of Radiology Juntendo University Graduate School of MedicineTokyoJapan Faculty of Health Data Science Juntendo UniversityChibaJapan

Parkinson's disease(PD)is a progressive neurodegenerative disorder characterized primarily by classical motor signs of bradykinesia,rigidity,tremors,and postural instability usually manifesti ng unilate rally or at least *** disease involves a loss of dopaminergic neurons projecting from the substantia nigra pars compacta to the dorsal striatum.

关键词： rigidity tremor primarily

Contrasting oxidation states of low-Ti and high-Ti magmas control Ni-Cu sulfide and Fe-Ti oxide mineralization in Emeishan Large Igneous Province

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Geoscience Frontiers 2022年第6期13卷 41-58页

作者： Yonghua Cao christina Yan Wang Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring Ministry of EducationSchool of Geosciences and Info-PhysicsCentral South UniversityChangsha 410083China Key Laboratory of Mineralogy and Metallogeny Guangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhou 510640China CAS Center for Excellence in Deep Earth Science Guangzhou 510640China Guangdong Provincial Key Laboratory of Mineral Physics and Materials Guangzhou 510640China

Magmatic Ni-Cu-(PGE) sulfide and Fe-Ti oxide deposits in plume-related large igneous provinces(LIPs)are commonly related to low-Ti and high-Ti series magmas, respectively, but the major factors that control such a relationship of metallogenic types and magma compositions are unclear. Magma fOcontrols sulfur status and relative timing of Fe-Ti oxide saturation in mafic magmas, which may help clarify this issue. Taking the Emeishan LIP as a case, we calculated the magma fOof the high-Ti and low-Ti picrites based on the olivine-spinel oxygen barometer, and the partitioning of V in olivine. The obtained fOof the high-Ti series magma(FMQ + 1.1 to FMQ + 2.6) is higher than that of the low-Ti series magma(FMQ-0.5to FMQ + 0.5). The magma fOof the high-Ti and low-Ti picrites containing Fo > 90 olivine reveals that the mantle source of the high-Ti series is likely more oxidized than that of the low-Ti series. The results using the ’lambda REE’ approach show that the high-Ti series may have been derived from relatively oxidized mantle with garnet pyroxenite component. The S contents at sulfide saturation(SCSS) of the two series magmas were calculated based on liquid compositions obtained from the alpha Melts modeling, and the results show that the low-Ti series magma could easily attain the sulfide saturation as it has low fOwith S being dominantly as S. In contrast, the oxidized high-Ti series magma is difficult to attain the sulfide saturation, but could crystallize Fe-Ti oxides at magma MgO content of ~7.0 wt.%. Thus, contrasting magma fOof low-Ti and high-Ti series in plume-related LIPs may play an important role in producing two different styles of metallogeny.

关键词： Emeishan large igneous province Mantle plume High-Ti and low-Ti series magma Magma oxygen fugacity Magmatic Fe-Ti oxide deposits Magmatic Ni-Cu-(PGE)deposits

Human endogenous retroviruses and cancer:Causality and therapeutic possibilities

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World Journal of Gastroenterology 2012年第42期18卷 6027-6035页

作者： christina S Mullins Michael Linnebacher Department of General ThoracicVascular and Transplantation SurgerySection Molecular Oncology and ImmunotherapyUniversity of RostockSchillingallee 3518057 RostockGermany

A substantial part of the human genome is derived from transposable elements;remnants of ancient retroviral *** estimates set the percentage of human endogenous retroviruses(HERVs) in the genome at 8%.For the most part,the interplay between mutations,epigenetic mechanisms and posttranscriptional regulations silence HERVs in somatic *** first highlight mechanisms by which activation of members of several HERV families may be associated with tumor development before discussing the arising chances for both diagnosis and *** has been shown that at least in some cases,tumor cells expressing HERV open reading frames(ORFs) thus gain tumor-promoting ***,since these proteins are not expressed in healthy tissues,they become prime target *** potential pharmacological interest are the prevention of HERV transposition,the inhibition of HERV-encoded protein expression and the interference with these proteins' *** from recent studies unequivocally proves that HERV ORFs represent a very interesting source of novel tumor-specific antigens with even the potential to surpass entity *** development of new tumor(immune-) therapies is a very active field and true tumor-specific targets are of outstanding interest since they minimize the risk of autoimmunity and could reduce side ***,we postulate on main future research streams in order to stimulate discussion on this hot topic.

关键词： Human endogenous retroviruses Gastro-intestinal cancer Therapeutic targets Tumor-specificantigens Tumorigenesis

Quantification of skid resistance seasonal variation in asphalt pavements

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Journal of Traffic and Transportation Engineering(English Edition) 2020年第2期7卷 237-248页

作者： christina Plati Maria Pomoni Konstantina Georgouli Laboratory of Pavement Engineering School of Civil EngineeringNational Technical University of Athens(NTUA)Athens 15773Greece

The present study deals with the quantification of skid resistance seasonal variation in asphalt ***,skid resistance data were collected twice per year(after"wet"and"dry"seasons)along four trial sections of an urban highway with a GripTester system(during a six-year field experiment).For the estimation of a percentage reference change(%)between wet and dry skid resistance data,a methodology is developed based on distribution fitting of the percentage change of skid resistance index due to seasonal variation *** outcome of the analysis is applied and successfully validated through a set of skid resistance data collected from an interurban highway pavement section with different traffic and environmental *** such the developed methodology can be considered as a promising tool for accommodating the seasonal variation of skid ***,the resulting percentage reference change(%)enables the estimation of skid resistance level for the dry period based on the wet period ***,it seems that the proposed quantification process may constitute a practical yet efficient tool for road authorities and highway operators on how to estimate the effect of seasonal variation on skid resistance levels and schedule well-ahead necessary actions for enhancing driving safety.

关键词： Asphalt pavement Skid resistance Seasonal variation Quantification Road safety

Autonomous vehicles wheel wander: Structural impact on flexible pavements

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Journal of Traffic and Transportation Engineering(English Edition) 2021年第3期8卷 388-398页

作者： Konstantina Georgouli christina Plati Andreas Loizos Department of Transportation Planning and Engineering School of Civil EngineeringNational Technical University of AthensZografou 15773Greece

Autonomous vehicles(AVs), including trucks, are already available and their adoption is coming at a rapid pace. Despite the fact that this new transportation technology will travel on existing pavement infrastructure assets, the study and investigation of the AVs structural impact on pavements has not reached the same level of attention and maturity as other related research areas. Considering the extensive investment on pavement construction and maintenance, the necessity to fully understand these impacts in the long term, is becoming evident. The present paper presents and discusses currently published relevant research and findings on the quantification of the wheel wander potential impact,both negative and positive, offering potential insightful future areas of enquiry to help mold and shape future research for this emerging field. The paper focuses on the impact of the AVs zero lateral wheel wander on both new flexible pavement design and the damage accumulation within existing flexible pavement structures. Other wheel wander distributions(normal, uniform, etc.) are investigated as well. The outcome and findings are that the AVs zero lateral wheel wander has a definable negative structural impact on flexible pavement structures in comparison to current human-driven(non-autonomous) vehicles that tend to follow a normal lateral wheel wander distribution. However, under certain defined conditions(optimal wheel wander distribution), the pavement service life can be potentially extended.

关键词： Road engineering Autonomous vehicles Wheel wander Pavement design Pavement performance

Extrinsic and intrinsic mechanisms of axon regeneration:the need for spinal cord injury treatment strategies to address both

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Neural Regeneration Research 2016年第4期11卷 572-574页

作者： christina Francisca Vogelaar Institute of Microanatomy and Neurobiology Johannes Gutenberg-University Mainz

Spinal cord injury（SCI）causes disturbances in motor and sensory functions leading to paralysis,the severity of which depends on the spinal level of the *** lesions of spinal cord axon projection tracts are untreatab... 详细信息

关键词： gene Extrinsic and intrinsic mechanisms of axon regeneration