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MAKET EFFICIENCY IN A SMALL INDUSTRIALIZED COUNTRY: THE CASE OF DENMARK
David M. Reeb,Helle L. Lf}nroth,Chuck C. Y. Kwok 사람과세계경영학회 1998 Global Business and Finance Review Vol.3 No.2
This article examines the informational efficiency of the Copenhagen Stock Exchange (CSE) in Denmark. Following Famas(l970) three levels ofmarket efficiency, efficiency tests are applied to the CSE daily stock return datafrom January 1985 to March 1994. Besides the traditional random walk andfilter rule tests, a more recent methodology ofexpected utility test is applied to test the weakform efficiency. In testing semi-strongform efficiency, the focus is on how fast new information is incorporated in security prices. Finally, the strong form test investigates if security analysts in Denmark possess private information that may lead to excess profits. The results do not suggest that the CSE is any less efficient than the larger stock markets in the world.
MARKET EFFICIENCY IN A SMALL INDUSTRIALIZED COUNTRY: THE CASE OF DENMARK
David M Reeb,Helle L Lønroth,Chuck C Y Kwok People&Global Business Association 1998 Global Business and Finance Review Vol.3 No.2
This article examines the informational efficiency of the Copenhagen Stock Exchange (CSE) in Denmark. Following Fama's(l970) three levels of market efficiency, efficiency tests are applied to the CSE daily stock return data from January 1985 to March 1994. Besides the traditional random walk and filter rule tests, a more recent methodology of expected utility test is applied to test the weak form efficiency. In testing semi-strong form efficiency, the focus is on how fast new information is incorporated in security prices. Finally, the strong form test investigates if security analysts in Denmark possess private information that may lead to excess profits. The results do not suggest that the CSE is any less efficient than the larger stock markets in the world.
L. K. Eckersley,David J. Garbary 한국조류학회I 2007 ALGAE Vol.22 No.2
Annual growth segments of Ascophyllum nodosum (L.) Le Jolis (Fucales, Fucaceae) are denoted by air bladders that form each spring. By examining annual growth segments, it may be possible to infer information about the physical conditions during the growth period; however, it is uncertain whether the annual segments will expand in size after the initial growth. We examined A. nodosum segments from three populations in Nova Scotia, and statistically evaluated whether the annual growth (length, mass, and maximum diameter) of segments was independent of the age of the frond, whether the segments increased in size after the initial growth, and whether the segment lengths were correlated with mean water temperatures and mean air temperatures when the segments were formed. We found that the growth in length of A. nodosum is dependent on the age of the frond, but frond age explained less than 12 % of the overall variation in length. However, the mass and maximum diameter of segments were independent of the age of the frond. Differences occurred between the lengths of segments formed in different years, but there was no significant correlation with regional mean water or air temperatures. This study indicates that the length of A. nodosum segments may be an indicator of the annual physical characteristics of a site, but future studies are needed to identify which factors have the strongest influence on growth patterns.
Crowe, David L.,Cui, Xiao-Mei,Shuler, Charles F. Korean Academy of Oral Biology and the UCLA Dental 1998 International Journal of Oral Biology Vol.23 No.2
Acidic ribosomal proteins interact with multiple translation factors to regulate protein synthesis in prokaryotic and eukaryotic organisms. We have isolated and sequenced the complete cDNA of the mouse acidic ribosomal phosphoprotein P1 (mARP P1). The 495 base pair cDNA encodes a single open reading frame of 114 amino acids. Northern amalysis revealed a messenger RNA of appropriate size expressed in all tissues. Stable transfection of 3T3 cells with a vector containing an antisense mARP P1 construct reduced expression of the mRNA by 90%. Cells expressing the antisense construct did not incorporate radiolabeled methionine as efficiently as 3T3s transfected with vector alone. Cells expressing the antisense construct were also less prolifeeerative in vitro. Anlaysis of the deduced sequence and comparison to P proteins from other organisms revealed homology to the L12eILA protein in yeast. The carboxy termini of these proteins are highly conserved across species. The central alanine rich region of the mouse P1 protein likely evlived through duplications of a conserved sequence and may represent evolutionary modifications of an ancestral gene.
A novel sensor for the detection of n-butanol based on CoMn2O4 nanoparticles
Juan Pablo Morán-Lázaro,Maykel Courel-Piedrahita,Alex Guillén-Bonilla,Florentino López-Urías,Héctor Guillén-Bonilla,Víctor Manuel Soto-García,Aldo Palafox-Corona,David Alberto Hernández-Poot 대한금속·재료학회 2024 ELECTRONIC MATERIALS LETTERS Vol.20 No.5
In this paper, we studied the alcohol-sensing properties of CoMn 2 O 4 nanoparticles for the fi rst time. The CoMn 2 O 4nanoparticles were prepared via a simple microwave-assisted colloidal method using cobalt nitrate, manganese nitrate,dioctyl sulfosuccinate sodium salt, and ethylene glycol as a solvent. Various techniques were used to characterize the structural,morphological, and optical properties of CoMn 2 O 4 . The crystal structure of CoMn 2 O 4 was found after calcinationat a temperature of 400 °C. The Raman spectrum showed seven vibrational bands, while the optical absorption spectrumshowed three bands, confi rming the spinel CoMn 2 O 4 . Morphological analysis revealed that the porous microstructure ofCoMn 2 O 4 was composed of nanoparticles with a size distribution of 16 to 58 nm. Gas sensors were fabricated with theCoMn 2 O 4 powders calcined at 400 °C using the brush-coating method, and experimental results showed that CoMn 2 O 4nanoparticles were more sensitive to n -butanol than isopropanol and ethanol at an operating temperature of 185 °C. TheCoMn 2 O 4 sensor showed a response of 6.6 at 50 ppm n -butanol with good stability, reproducibility, and repeatability. The present article provides a new sensing material that could be used as an n -butanol sensor with signifi cant benefi tsfor human health.
A new formulation of cracking in concrete structures based on lumped damage mechanics
Daniel V.C. Teles,Rafael N. Cunha,Ricardo A. Picón,David L.N.F. Amorim,Yongtao Bai,Sergio P.B. Proença,Julio Flórez-López 국제구조공학회 2023 Structural Engineering and Mechanics, An Int'l Jou Vol.88 No.5
Lumped Damage Mechanics (LDM) is a theory proposed in the late eighties, which assumes that structural collapse may be analyzed as a two-phase phenomenon. In the first (pre-localization) stage, energy dissipation is a continuous process and it may be modelled by means of the classic versions of the theory of plasticity or Continuum Damage Mechanics (CDM). The second, post-localization, phase can be modelled assuming that energy dissipation is lumped in zones of zero volume: inelastic hinges, hinge lines or localization surfaces. This paper proposes a new LDM formulation for cracking in concrete structures in tension. It also describes its numerical implementation in conventional finite element programs. The results of three numerical simulations of experimental tests reported in the literature are presented. They correspond to plain and fiber-reinforced concrete specimens. A fourth simulation describes also the experimental results of a new test using the digital image correlation technique. These numerical simulations are also compared with the ones obtained using conventional Cohesive Fracture Mechanics (CFM). It is then shown that LDM conserves the advantages of both, CDM and CFM, while overcoming their drawbacks.