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Sample records for ag-cu alloys journal

  1. Advances of Ag, Cu, and Ag-Cu alloy nanoparticles synthesized via chemical reduction route

    Energy Technology Data Exchange (ETDEWEB)

    Tan, Kim Seah; Cheong, Kuan Yew, E-mail: cheong@eng.usm.my [Universiti Sains Malaysia, Electronic Materials Research Group, School of Materials and Mineral Resources Engineering (Malaysia)

    2013-04-15

    Silver (Ag) and copper (Cu) nanoparticles have shown great potential in variety applications due to their excellent electrical and thermal properties resulting high demand in the market. Decreasing in size to nanometer scale has shown distinct improvement in these inherent properties due to larger surface-to-volume ratio. Ag and Cu nanoparticles are also shown higher surface reactivity, and therefore being used to improve interfacial and catalytic process. Their melting points have also dramatically decreased compared with bulk and thus can be processed at relatively low temperature. Besides, regularly alloying Ag into Cu to create Ag-Cu alloy nanoparticles could be used to improve fast oxidizing property of Cu nanoparticles. There are varieties methods have been reported on the synthesis of Ag, Cu, and Ag-Cu alloy nanoparticles. This review aims to cover chemical reduction means for synthesis of those nanoparticles. Advances of this technique utilizing different reagents namely metal salt precursors, reducing agents, and stabilizers, as well as their effects on respective nanoparticles have been systematically reviewed. Other parameters such as pH and temperature that have been considered as an important factor influencing the quality of those nanoparticles have also been reviewed thoroughly.

  2. Au-Ag-Cu nano-alloys: tailoring of permittivity

    Science.gov (United States)

    Hashimoto, Yoshikazu; Seniutinas, Gediminas; Balčytis, Armandas; Juodkazis, Saulius; Nishijima, Yoshiaki

    2016-04-01

    Precious metal alloys enables new possibilities to tailor materials for specific optical functions. Here we present a systematic study of the effects of a nanoscale alloying on the permittivity of Au-Ag-Cu metals at 38 different atomic mixing ratios. The permittivity was measured and analyzed numerically by applying the Drude model. X-ray diffraction (XRD) revealed the face centered cubic lattice of the alloys. Both, optical spectra and XRD results point towards an equivalent composition-dependent electron scattering behavior. Correlation between the fundamental structural parameters of alloys and the resulting optical properties is elucidated. Plasmonic properties of the Au-Ag-Cu alloy nanoparticles were investigated by numerical simulations. Guidelines for designing plasmonic response of nano- structures and their patterns are presented from the material science perspective.

  3. Au-Ag-Cu nano-alloys: tailoring of permittivity

    Science.gov (United States)

    Hashimoto, Yoshikazu; Seniutinas, Gediminas; Balčytis, Armandas; Juodkazis, Saulius; Nishijima, Yoshiaki

    2016-01-01

    Precious metal alloys enables new possibilities to tailor materials for specific optical functions. Here we present a systematic study of the effects of a nanoscale alloying on the permittivity of Au-Ag-Cu metals at 38 different atomic mixing ratios. The permittivity was measured and analyzed numerically by applying the Drude model. X-ray diffraction (XRD) revealed the face centered cubic lattice of the alloys. Both, optical spectra and XRD results point towards an equivalent composition-dependent electron scattering behavior. Correlation between the fundamental structural parameters of alloys and the resulting optical properties is elucidated. Plasmonic properties of the Au-Ag-Cu alloy nanoparticles were investigated by numerical simulations. Guidelines for designing plasmonic response of nano- structures and their patterns are presented from the material science perspective. PMID:27118459

  4. Au-Ag-Cu nano-alloys: tailoring of permittivity.

    Science.gov (United States)

    Hashimoto, Yoshikazu; Seniutinas, Gediminas; Balčytis, Armandas; Juodkazis, Saulius; Nishijima, Yoshiaki

    2016-01-01

    Precious metal alloys enables new possibilities to tailor materials for specific optical functions. Here we present a systematic study of the effects of a nanoscale alloying on the permittivity of Au-Ag-Cu metals at 38 different atomic mixing ratios. The permittivity was measured and analyzed numerically by applying the Drude model. X-ray diffraction (XRD) revealed the face centered cubic lattice of the alloys. Both, optical spectra and XRD results point towards an equivalent composition-dependent electron scattering behavior. Correlation between the fundamental structural parameters of alloys and the resulting optical properties is elucidated. Plasmonic properties of the Au-Ag-Cu alloy nanoparticles were investigated by numerical simulations. Guidelines for designing plasmonic response of nano- structures and their patterns are presented from the material science perspective. PMID:27118459

  5. Electrochemical behavior of Ag-Cu alloy in alkaline media

    Directory of Open Access Journals (Sweden)

    Grekulović Vesna J.

    2010-01-01

    Full Text Available Results of the investigation of electrochemical behaviour of Ag-Cu alloy containing 50 mass% Ag and 50 mass% Cu are presented in this paper. Pure silver and copper were investigated, too. Working electrodes were prepared by metallurgical process. 1 mol dm-3 and 0.5 mol dm-3 solutions of NaOH are chosen as the electrolyte. On the cyclic voltammograms, some current waves corresponding to number and quantity of phases present in the investigated electrodes appeared and they can be used for characterization of investigated alloy. On the voltammogram recorded for pure silver, two anodic and two cathodic peaks appeared. First peak consisted of two joined current waves which can be ascribed to the formation of the two different types of silver(I oxide, Ag2O. Second peak should correspond to the formation of silver(II oxide, AgO. Voltammogram obtained for pure copper exhibits one broad current wave corresponding to the formation of copper oxides, followed by a wide potential area in which copper is completely passive. At 0.4 V vs. SCE, current starts to increase again due to oxygen evolution and probably due to simultaneous dissolution of copper with formation of CuO22- as a product. In alkaline solutions copper has no significant influence on the shape and current values of the voltammograms recorded for Ag-Cu alloy; however, it has an influence only on the anodic and cathodic peak potentials, which are shifted to more negative values in comparison to Ag. It could mean an easier formation of oxides and their harder reduction. Comparing voltammograms recorded for Ag-Cu alloy in 0.5 moldm-3 NaOH and in 1 moldm-3 NaOH solutions, one can see that current waves appear at more positive potentials on the voltammograms obtained in the solution of lower concentration and with much higher current densities than those on the voltammograms obtained in the solution of higher concentration.

  6. Optical Limiting Properties of Ag-Cu Metal Alloy Nanoparticles Analysis by using MATLAB

    International Nuclear Information System (INIS)

    Ag-Cu alloy nanoparticles were formed by sequential ion implantation (Ag and Cu) in silica using a metal vapor vacuum arc (MEVVA) ion source. Third-order nonlinear optical properties of the nanoparticles were measured at 1064 nm excitations using the Z-scan technique. Curve fitting analysis, based on the MATLAB features for Ag-Cu alloy nanoparticle optical limiting experiments, is used. The results show that Ag-Cu alloy nanoparticles display a refractive optical limiting effect at 1064nm. (condensed matter: structure, mechanical and thermal properties)

  7. Thermodynamic properties of the liquid Ag-Cu-Sn lead-free solder alloys

    International Nuclear Information System (INIS)

    The electromotive force measurement method was employed to determine the thermodynamic properties of liquid Ag-Cu-Sn alloys using solid electrolyte galvanic cells as shown below: Kanthal+Re,Ag-Cu-Sn,SnO2|YttriastabilizedZirconia|air,Pt,pO2=0.21atm Measurements were carried out for three cross-sections with constant Ag/Cu ratio equal to: 1/3, 1 and 3 and for tin compositions ranging from 10 up to 80 at.%, every 10%, resulting in a total of 24 different alloy compositions. The temperature of the measurements varied within the range from 973 to 1325 K. A linear dependence of the e.m.f. on temperature was observed for all alloy compositions and the appropriate line equations were derived. Tin activities were calculated as function of composition and temperature. Results were presented in tables and figures.

  8. Optical Limiting Properties of Ag-Cu Metal Alloy Nanoparticles Analysis by using MATLAB

    Institute of Scientific and Technical Information of China (English)

    WANG Yu-Hua; LI Hui-Qing; LU Jian-Duo; WANG Ru-Wu

    2011-01-01

    Ag-Cu alloy nanoparticles were formed by sequential ion implantation (Ag and Cu) in silica using a metal vapor vacuum arc (MEVVA) ion source.Third-order nonlinear optical properties of the nanoparticles were measured at 1064nm excitations using the Z-scan technique.Curve fitting analysis,based on the MATLAB features for Ag-Cu alloy nanoparticle optical limiting experiments,is used.The results show that Ag-Cu alloy nanoparticles display a refractive optical limiting effect at 1064 nm.Recently,increasing attention has been focused on the third-order nonlinear susceptibility and the photorefractive effect of noble-metal clusters embedded in dielectric matrices.[1-3] Third-order nonlinearities of metal/dielectric composite materials are influenced not only by the type and size of the embedded metal clusters,but also by the dielectric constant,thermal conductivity and heat capacity of the dielectric matrices.[4-6] Amongst the nanoparticles studied earlier,high nonlinear absorption and nonlinear refraction coefficients were found in copper and copper containing nanomaterials.[7,8] For silver,the nonlinear refractive index γ changes from positive to negative upon the growth of clusters.[9] Potential applications of optical limiters in the protection of sensors from intense laser pulses have motivated great efforts to design new nonlinear optical systems.[10]%Ag-Cu alloy nanoparticles were formed by sequential ion implantation (Ag and Cu) in silica using a metal vapor vacuum arc (MEVVA) ion source. Third-order nonlinear optical properties of the nanoparticles were measured at 1064 nm excitations using the Z-scan technique. Curve fitting analysis, based on the MATLAB features for Ag-Cu alloy nanoparticle optical limiting experiments, is used. The results show that Ag-Cu alloy nanoparticles display a refractive optical limiting effect at 1064 nm.

  9. Novel PdAgCu ternary alloy: Hydrogen permeation and surface properties

    Science.gov (United States)

    Tarditi, Ana M.; Braun, Fernando; Cornaglia, Laura M.

    2011-05-01

    Dense PdAgCu ternary alloy composite membranes were synthesized by the sequential electroless plating of Pd, Ag and Cu on top of both disk and tubular porous stainless steel substrates. X-ray diffraction and scanning electron microscopy were employed to study the structure and morphology of the tested samples. The hydrogen permeation performance of these membranes was investigated over a 350-450 °C temperature range and a trans-membrane pressure up to 100 kPa. After annealing at 500 °C in hydrogen stream followed by permeation experiments, the alloy layer presented a FCC crystalline phase with a bulk concentration of 68% Pd, 7% Ag and 25% Cu as revealed by EDS. The PdAgCu tubular membrane was found to be stable during more than 300 h on hydrogen stream. The permeabilities of the PdAgCu ternary alloy samples were higher than the permeabilities of the PdCu alloy membranes with a FCC phase. The co-segregation of silver and copper to the membrane surface was observed after hydrogen permeation experiments at high temperature as determined by XPS.

  10. Novel PdAgCu ternary alloy: Hydrogen permeation and surface properties

    International Nuclear Information System (INIS)

    Dense PdAgCu ternary alloy composite membranes were synthesized by the sequential electroless plating of Pd, Ag and Cu on top of both disk and tubular porous stainless steel substrates. X-ray diffraction and scanning electron microscopy were employed to study the structure and morphology of the tested samples. The hydrogen permeation performance of these membranes was investigated over a 350-450 deg. C temperature range and a trans-membrane pressure up to 100 kPa. After annealing at 500 deg. C in hydrogen stream followed by permeation experiments, the alloy layer presented a FCC crystalline phase with a bulk concentration of 68% Pd, 7% Ag and 25% Cu as revealed by EDS. The PdAgCu tubular membrane was found to be stable during more than 300 h on hydrogen stream. The permeabilities of the PdAgCu ternary alloy samples were higher than the permeabilities of the PdCu alloy membranes with a FCC phase. The co-segregation of silver and copper to the membrane surface was observed after hydrogen permeation experiments at high temperature as determined by XPS.

  11. Novel PdAgCu ternary alloy: Hydrogen permeation and surface properties

    Energy Technology Data Exchange (ETDEWEB)

    Tarditi, Ana M.; Braun, Fernando [Instituto de Investigaciones en Catalisis y Petroquimica (FIQ, UNL-CONICET), Santiago del Estero 2829, 3000 Santa Fe (Argentina); Cornaglia, Laura M., E-mail: lmcornag@fiq.unl.edu.ar [Instituto de Investigaciones en Catalisis y Petroquimica (FIQ, UNL-CONICET), Santiago del Estero 2829, 3000 Santa Fe (Argentina)

    2011-05-15

    Dense PdAgCu ternary alloy composite membranes were synthesized by the sequential electroless plating of Pd, Ag and Cu on top of both disk and tubular porous stainless steel substrates. X-ray diffraction and scanning electron microscopy were employed to study the structure and morphology of the tested samples. The hydrogen permeation performance of these membranes was investigated over a 350-450 deg. C temperature range and a trans-membrane pressure up to 100 kPa. After annealing at 500 deg. C in hydrogen stream followed by permeation experiments, the alloy layer presented a FCC crystalline phase with a bulk concentration of 68% Pd, 7% Ag and 25% Cu as revealed by EDS. The PdAgCu tubular membrane was found to be stable during more than 300 h on hydrogen stream. The permeabilities of the PdAgCu ternary alloy samples were higher than the permeabilities of the PdCu alloy membranes with a FCC phase. The co-segregation of silver and copper to the membrane surface was observed after hydrogen permeation experiments at high temperature as determined by XPS.

  12. Trapping of self-interstitials in dilute AgCu and AgZn alloys

    International Nuclear Information System (INIS)

    Dilute alloys of AgCu and AgZn have been irradiated at various temperatures within stage II and subsequently annealed up to stage III. It is inferred from the production and the recovery data that mixed dumbbells are formed above stage I which become mobile in the middle of stage II. They are retrapped by the Cu or Zn atoms to form a more stable complex like an impurity-impurity dumbbell

  13. Trapping of self-interstitials in dilute AgCu and AgZn alloys. [Electrons

    Energy Technology Data Exchange (ETDEWEB)

    Maury, F.; Lucasson, A.; Lucasson, P. (Universite Paris 11, 91 - Orsay (France))

    1984-01-01

    Dilute alloys of AgCu and AgZn have been irradiated at various temperatures within stage II and subsequently annealed up to stage III. It is inferred from the production and the recovery data that mixed dumbbells are formed above stage I which become mobile in the middle of stage II. They are retrapped by the Cu or Zn atoms to form a more stable complex like an impurity-impurity dumbbell.

  14. Preparation and optical properties of silica Ag-Cu alloy core-shell composite colloids

    International Nuclear Information System (INIS)

    The silica Ag-Cu alloy core-shell composite colloids have been successfully synthesized by an electroless plating approach to explore the possibility of modifying the plasmon resonance at the nanoshell surface by varying the metal nanoshell composition for the first time. The surface plasmon resonance of the composite colloids increases in intensity and shifts towards longer, then shorter wavelengths as the Cu/Ag ratio in the alloy shell is increased. The variations in intensity of the surface plasmon resonance with the Cu/Ag ratio obviously affect the Raman bands of the silica colloid core. The report here may supply a new technique to effectively modify the surface plasmon resonance. - Graphical abstract: The silica Ag-Cu alloy core-shell colloids have been successfully synthesized to explore the possibility of modifying the surface plasmon resonance (SPR) by varying the metal nanoshell composition for the first time. Varying the Cu/Ag ratio of the alloy nanoshell has obvious influences on the SPR of the composite colloids and the Raman bands of the amorphous silica core

  15. Ag-Cu-Si合金的熔化特性%Melting Characterization of Ag-Cu-Si Alloys

    Institute of Scientific and Technical Information of China (English)

    罗锡明

    1999-01-01

    用DTA法测定Ag-Cu-Si合金中(CuAgx)100-y-Siy(x=10,20,30,40,50,72)及(CuSi5)-Ag 7个特定成份伪二元系的固相线、液相线.结果表明,Si含量对Ag-Cu合金液相线温度及熔化间隔Δt的影响是显著的.在研究的Si名誉含量0~10wt%,其液相线呈"V"型变化.Δt值小对于钎料合金选择和降低Ag含量是有利的.

  16. The Effects of Adding Elements of Zinc and Magnesium on Ag-Cu Eutectic Alloy for Warming Acupuncture

    Science.gov (United States)

    Park, Il Song; Kim, Keun Sik; Lee, Min Ho

    2013-01-01

    The warming acupuncture for hyperthermia therapy is made of STS304. However, its needle point cannot be reached to a desirable temperature due to heat loss caused by low thermal conductivity, and the quantification of stimulation condition and the effective standard establishment of warming acupuncture are required as a heat source. Accordingly, in this study, after Ag-Cu alloys with different composition ratios were casted and then mixed with additives to improve their physical and mechanical properties, the thermal conductivity and biocompatibility of the alloy specimens were evaluated for selecting suitable material. Ag-Cu binary alloys and ternary alloys added 5 wt% Zn or 2 wt% Mg were casted and then cold drawn to manufacture needles for acupuncture, and their physical properties, thermal conductivity, and biocompatibility were evaluated for their potential use in warming acupuncture. The results of this study showed that the physical and mechanical properties of the Ag-Cu alloys were improved by additives and that the thermal conductivity, machinability, and biocompatibility of the Ag-Cu alloys were improved by Mg addition. PMID:24078827

  17. The Effects of Adding Elements of Zinc and Magnesium on Ag-Cu Eutectic Alloy for Warming Acupuncture

    Directory of Open Access Journals (Sweden)

    Yu Kyoung Kim

    2013-01-01

    Full Text Available The warming acupuncture for hyperthermia therapy is made of STS304. However, its needle point cannot be reached to a desirable temperature due to heat loss caused by low thermal conductivity, and the quantification of stimulation condition and the effective standard establishment of warming acupuncture are required as a heat source. Accordingly, in this study, after Ag-Cu alloys with different composition ratios were casted and then mixed with additives to improve their physical and mechanical properties, the thermal conductivity and biocompatibility of the alloy specimens were evaluated for selecting suitable material. Ag-Cu binary alloys and ternary alloys added 5 wt% Zn or 2 wt% Mg were casted and then cold drawn to manufacture needles for acupuncture, and their physical properties, thermal conductivity, and biocompatibility were evaluated for their potential use in warming acupuncture. The results of this study showed that the physical and mechanical properties of the Ag-Cu alloys were improved by additives and that the thermal conductivity, machinability, and biocompatibility of the Ag-Cu alloys were improved by Mg addition.

  18. THE ELECTRONIC STRUCTURE OF AG/CU(100) SURFACE ALLOYS STUDIES BY AUGER-PHOTOELECTRON COINCIDENCE SPECTROSCOPY.

    Energy Technology Data Exchange (ETDEWEB)

    ARENA,D.A.; BARTYNSKI,R.A.; HULBERT,S.L.

    2001-10-08

    We have measured the Ag and Pd M{sub 5}VV Auger spectrum in coincidence with Ag and Pd 4d{sub 5/2} photoelectrons for the Ag/Cu(100) and Pd/Cu(100) systems, respectively, as a function of admetal coverage. These systems form surface alloys (i.e. random substitutional alloys in the first atomic layer) for impurity concentrations in the 0.1 monolayer range. For these systems, the centroid of the impurity 4d levels is expected to shift away from the Fermi level by {approx}1 eV [Ruban et al., Journal of Molecular Catalysis. A 115 (1997) 421], an effect that should be easily seen in coincidence core-valence-valence Auger spectra. We find that the impurity Auger spectra of both systems shift in a manner that is consistent with d-band moving away from EF. However, the shift for Pd is considerably smaller than expected, and a shift almost absent for Ag. The disagreement between theory and experiment is most likely caused by the neglect of lattice relaxations in the calculations.

  19. Brazing of zirconia to titanium using Ag-Cu and Au-Ni filler alloys

    Directory of Open Access Journals (Sweden)

    Jean S. Pimenta

    2013-12-01

    Full Text Available Advanced ceramic is usually joined to metal by the well-known direct brazing process, where costly active filler alloys can be considered a limitation. Brazing using active-metal-free filler alloy as insert between the joint components is an attempt to overcome it. The active metal diffusion from the titanium member through the bulk of molten filler to the ceramic was responsible to produce an active filler alloy in loco and promote reduction of the zirconium oxide to improve wetting on the ceramic surface. Unalloyed titanium was joined in a high-vacuum furnace (<3x10-5 mbar to yttria-tetragonal zirconia polycristals (Y-TZP and zirconia partially stabilized with magnesia (Mg-PSZ, where commercial fillers Ag-28Cu and Au-18Ni with respective thermal cycles were evaluated. Helium gas leak detection test was performed at the ceramic/metal interface at room temperature; samples from reliable vacuum tight joints were examined by microstructural analysis techniques and energy dispersive X-ray analysis at the joint cross-section. Tight joints were produced with eutectic Ag-Cu filler, revealing an intermetallic layer and a dark reaction layer near the ceramic surface; titanium diffusion was efficient for superficial chemical interactions between individual components. Brazing joints were also tested using three-point flexure testing.

  20. Synthesis and thermal behavior of tin-based alloy (Sn-Ag-Cu) nanoparticles.

    Science.gov (United States)

    Roshanghias, Ali; Yakymovych, Andriy; Bernardi, Johannes; Ipser, Herbert

    2015-03-19

    The prominent melting point depression of nanoparticles has been the subject of a considerable amount of research. For their promising applications in electronics, tin-based nano-alloys such as near-eutectic Sn-Ag-Cu (SAC) alloys have been synthesized via various techniques. However, due to issues such as particle aggregation and oxidation or introduced impurities, the application of these nano-size particles has been confined or aborted. For instance, thermal investigations by DTA/DSC in a large number of studies revealed exothermic peaks in the range of 240-500 °C, i.e. above the melting point of SAC nanoparticles, with different and quite controversial explanations for this unclear phenomenon. This represents a considerable drawback for the application of nanoparticles. Correspondingly, in the current study, the thermal stability of SAC nanoparticles has been investigated via electron microscopy, XRD, FTIR, and DSC/TG analysis. It was found that the nanoparticles consist mainly of a metallic β-Sn core and an amorphous tin hydroxide shell structure. The SnO crystalline phase formation from this amorphous shell has been associated with the exothermic peaks on the first heating cycle of the nanoparticles, followed by a disproportionation reaction into metallic Sn and SnO₂.The results also revealed that the surfactant and reducing agent cannot only affect the size and size distribution of the nanoparticles, they might also alter the ratio between the amorphous shell and the crystalline core in the structure of particles. PMID:25757694

  1. The Effects of Adding Elements of Zinc and Magnesium on Ag-Cu Eutectic Alloy for Warming Acupuncture

    OpenAIRE

    Yu Kyoung Kim; Il Song Park; Keun Sik Kim; Min Ho Lee

    2013-01-01

    The warming acupuncture for hyperthermia therapy is made of STS304. However, its needle point cannot be reached to a desirable temperature due to heat loss caused by low thermal conductivity, and the quantification of stimulation condition and the effective standard establishment of warming acupuncture are required as a heat source. Accordingly, in this study, after Ag-Cu alloys with different composition ratios were casted and then mixed with additives to improve their physical and mechanica...

  2. Joining of CBN abrasive grains to medium carbon steel with Ag-Cu/Ti powder mixture as active brazing alloy

    Energy Technology Data Exchange (ETDEWEB)

    Ding, W.F. [College of Mechanical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016 (China)]. E-mail: dingwf2000@vip.163.com; Xu, J.H. [College of Mechanical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016 (China); Shen, M. [College of Mechanical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016 (China); Su, H.H. [College of Mechanical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016 (China); Fu, Y.C. [College of Mechanical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016 (China); Xiao, B. [College of Mechanical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016 (China)

    2006-08-25

    In order to develop new generation brazed CBN grinding wheels, the joining experiments of CBN abrasive grains and medium carbon steel using the powder mixture of Ag-Cu alloy and pure Ti as active brazing alloy are carried out at elevated temperature under high vacuum condition. The relevant characteristics of the special powder mixture, the microstructure of the interfacial region, which are both the key factors for determining the joining behavior among the CBN grains, the filler layer and the steel substrate, are investigated extensively by means of differential thermal analysis (DTA), scanning electron microscope (SEM) and energy dispersion spectrometer (EDS), as well X-ray diffraction (XRD) analysis. The results show that, similar to Ag-Cu-Ti filler alloy, Ag-Cu/Ti powder mixture exhibits good soakage capability to CBN grains during brazing. Moreover, Ti in the powder mixture concentrates preferentially on the surface of the grains to form a layer of needlelike Ti-N and Ti-B compounds by chemical metallurgic interaction between Ti, N and B at high temperature. Additionally, based on the experimental results, the brazing and joining mechanism is deeply discussed in a view of thermodynamic criterion and phase diagram of Ti-B-N ternary system.

  3. Age-hardening and related phase transformation in an experimental Ag-Cu-Pd-Au alloy

    International Nuclear Information System (INIS)

    The age-hardening behaviour, phase transformation and related microstructural changes of an experimental Ag-Cu-Pd-Au alloy were examined by means of hardness test, X-ray diffraction (XRD), scanning electron microscopic (SEM) observations and electron probe microanalysis (EPMA). The specimen alloy showed apparent age-hardenability at the aging temperatures of 350 deg. C and 400 deg. C. By aging the solution-treated specimen at 400 deg. C, two phases of the Ag-rich α1 phase and the Pd-containing Cu-rich α2 phase were transformed into four phases of the Ag-rich α1' phase, the Cu-rich α2' phase, the CsCl-type CuPd phase and the AuCu(I) ordered phase. Microstructure of the solution-treated specimen consisted of the Ag-rich α1 matrix, Cu-rich α2 particle-like structures of various sizes and the lamellar structure of the α1 and α2 phases. When the peak hardness was obtained, the very fine lamellar structure consisting of the Ag-rich α1' and Cu-rich α2' phases was newly formed in the matrix. By further aging, the very fine lamellar structure grew and coarsened apparently, and the matrix was covered with the coarsened lamellar structure. The hardness increase was considered to be caused mainly by the diffusion and precipitation of Cu from the Ag-rich α1 matrix, and the hardness decrease in the latter stage of age-hardening process was caused by the coarsening of the very fine lamellar structure. The CsCl-type CuPd phase and the AuCu(I) ordered phase did not contribute to the hardness increase

  4. Bonding of Cf/SiC composite to Invar alloy using an active cement, Ag-Cu eutectic and Cu interlayer

    Science.gov (United States)

    Lei, Zhao; Xiaohong, Li; Jinbao, Hou; Qiang, Sun; Fuli, Zhang

    2012-10-01

    The interfacial microstructures and mechanical properties of the joints formed by active cement added brazing in vacuum of Cf/SiC composite to Invar alloy, using Ag-Cu eutectic alloy and pure copper foil as braze alloy and interlayer respectively, were investigated. CuTi, Cu4Ti3, Fe2Ti and the reaction layer of TiC and Si were the predominant components at the joint interface. The maximum shear strength of the joint was 77 MPa for brazing at 850 °C for 15 min. The results show that active cement added brazing in vacuum using Ag-Cu eutectic alloy and Cu interlayer can be used successfully for joining Cf/SiC composites to Invar alloy.

  5. Localized surface plasmon behavior of Ag-Cu alloy nanoparticles stabilized by rice-starch and gelatin

    Energy Technology Data Exchange (ETDEWEB)

    Singh, Manish Kumar; Mandal, R. K., E-mail: rkmandal.met@itbhu.ac.in [Department of Metallurgical Engineering, IIT (BHU), Varanasi and DST Unit on Nanoscience and Technology, BHU, Varanasi-221 005 (India); Manda, Premkumar; Singh, A. K. [DefenceMetallurgical Research Laboratory, KanchanBagh, Hyderabad-500058 (India)

    2015-10-15

    The purpose of this communication was to understand localized surface plasmon behavior of a series of Ag-Cu alloy nanoparticles capped by rice-starch and gelatin. The structures of dried powders were investigated with the help of X-ray diffraction. The analysis revealed Ag-rich and Cu-rich phases with maximum solid solubility of Cu ∼9 atom per cent; 8 atom per cent and Ag ∼ 16 atom per cent; 14 atom per cent in rice-starch and gelatin capped samples respectively. Transmission electron microscope was used for knowing the particle size as well as to supplement FCC phase formations of Ag-rich and Cu-rich solid phases arrived at based on X-ray diffraction studies. The UV-Vis spectra of sols were examined for the formation and stability of alloy nanoparticles. The temporal evolution of LSPR curves gave us to assert that the sol is stable for more than two months. Small angle X-ray scattering in the sol state was extensively utilized to understand nature of suspensions in terms of fractals. Such a study is important for having a correlation between LSPR behaviors with those of nanoparticle dispersion in aqueous media. It is believed that this work will be a contribution to the emerging field of plasmonics that include applications in the area of photophysical processes and photochemical reactions.

  6. Comparison of Extensive Thermal Cycling Effects on Microstructure Development in Micro-alloyed Sn-Ag-Cu Solder Joints

    Energy Technology Data Exchange (ETDEWEB)

    Anderson, Iver E.; Boesenberg, Adam; Harringa, Joel; Riegner, David; Steinmetz, Andrew; Hillman, David

    2011-09-28

    Pb-free solder alloys based on the Sn-Ag-Cu (SAC) ternary eutectic have promise for widespread adoption across assembly conditions and operating environments, but enhanced microstructural control is needed. Micro-alloying with elements such as Zn was demonstrated for promoting a preferred solidification path and joint microstructure earlier in simple (Cu/Cu) solder joints studies for different cooling rates. This beneficial behavior now has been verified in reworked ball grid array (BGA) joints, using dissimilar SAC305 (Sn-3.0Ag-0.5Cu, wt.%) solder paste. After industrial assembly, BGA components joined with Sn-3.5Ag-0.74Cu-0.21Zn solder were tested in thermal cycling (-55 C/+125 C) along with baseline SAC305 BGA joints beyond 3000 cycles with continuous failure monitoring. Weibull analysis of the results demonstrated that BGA components joined with SAC + Zn/SAC305 have less joint integrity than SAC305 joints, but their lifetime is sufficient for severe applications in consumer, defense, and avionics electronic product field environments. Failure analysis of the BGA joints revealed that cracking did not deviate from the typical top area (BGA component side) of each joint, in spite of different Ag3Sn blade content. Thus, SAC + Zn solder has not shown any advantage over SAC305 solder in these thermal cycling trials, but other characteristics of SAC + Zn solder may make it more attractive for use across the full range of harsh conditions of avionics or defense applications.

  7. Localized surface plasmon behavior of Ag-Cu alloy nanoparticles stabilized by rice-starch and gelatin

    Science.gov (United States)

    Singh, Manish Kumar; Manda, Premkumar; Singh, A. K.; Mandal, R. K.

    2015-10-01

    The purpose of this communication was to understand localized surface plasmon behavior of a series of Ag-Cu alloy nanoparticles capped by rice-starch and gelatin. The structures of dried powders were investigated with the help of X-ray diffraction. The analysis revealed Ag-rich and Cu-rich phases with maximum solid solubility of Cu ˜9 atom per cent; 8 atom per cent and Ag ˜ 16 atom per cent; 14 atom per cent in rice-starch and gelatin capped samples respectively. Transmission electron microscope was used for knowing the particle size as well as to supplement FCC phase formations of Ag-rich and Cu-rich solid phases arrived at based on X-ray diffraction studies. The UV-Vis spectra of sols were examined for the formation and stability of alloy nanoparticles. The temporal evolution of LSPR curves gave us to assert that the sol is stable for more than two months. Small angle X-ray scattering in the sol state was extensively utilized to understand nature of suspensions in terms of fractals. Such a study is important for having a correlation between LSPR behaviors with those of nanoparticle dispersion in aqueous media. It is believed that this work will be a contribution to the emerging field of plasmonics that include applications in the area of photophysical processes and photochemical reactions.

  8. Novel PdAgCu ternary alloy as promising materials for hydrogen separation membranes: Synthesis and characterization

    Science.gov (United States)

    Tarditi, Ana M.; Cornaglia, Laura M.

    2011-01-01

    The use of the sequential electroless plating method allowed us to obtain the PdAgCu ternary alloy on top of dense stainless steel (SS) 316 L disks. The XRD analysis indicated that initially the nucleation of the two phases of the alloy (FCC and BCC) takes place, but the FCC/BCC ratio increases with the annealing time at 500 °C in H 2 stream. After 162 h, the film contained only the FCC phase, which presents promising properties to be applied in the synthesis of hydrogen selective membranes. SEM cross-section results showed that a dense, continuous, defect-free film was deposited on top of the SS support, and the EDS data indicated that no significant gradient was present on the thickness of the film. XPS and LEIS allowed us to determine that Cu and Ag surface segregation takes place after annealing up to 500 °C/5 days. In the top-most surface layer, Ag enrichment takes place as determined by ARXPS experiments which can be the result of the lower surface tension of Ag compared to that of Cu and Pd. Increasing the annealing temperature results in an increase of the Ag surface segregation while the Cu concentration in the top-most surface layer decreases.

  9. Localized surface plasmon behavior of Ag-Cu alloy nanoparticles stabilized by rice-starch and gelatin

    Directory of Open Access Journals (Sweden)

    Manish Kumar Singh

    2015-10-01

    Full Text Available The purpose of this communication was to understand localized surface plasmon behavior of a series of Ag-Cu alloy nanoparticles capped by rice-starch and gelatin. The structures of dried powders were investigated with the help of X-ray diffraction. The analysis revealed Ag-rich and Cu-rich phases with maximum solid solubility of Cu ∼9 atom per cent; 8 atom per cent and Ag ∼ 16 atom per cent; 14 atom per cent in rice-starch and gelatin capped samples respectively. Transmission electron microscope was used for knowing the particle size as well as to supplement FCC phase formations of Ag-rich and Cu-rich solid phases arrived at based on X-ray diffraction studies. The UV-Vis spectra of sols were examined for the formation and stability of alloy nanoparticles. The temporal evolution of LSPR curves gave us to assert that the sol is stable for more than two months. Small angle X-ray scattering in the sol state was extensively utilized to understand nature of suspensions in terms of fractals. Such a study is important for having a correlation between LSPR behaviors with those of nanoparticle dispersion in aqueous media. It is believed that this work will be a contribution to the emerging field of plasmonics that include applications in the area of photophysical processes and photochemical reactions.

  10. Brazing of zirconia to titanium using Ag-Cu and Au-Ni filler alloys

    OpenAIRE

    Jean S. Pimenta; Augusto J. A. Buschinelli; Rubens M. do Nascimento; Augusto E. Martinelli; Joseph Remmel

    2013-01-01

    Advanced ceramic is usually joined to metal by the well-known direct brazing process, where costly active filler alloys can be considered a limitation. Brazing using active-metal-free filler alloy as insert between the joint components is an attempt to overcome it. The active metal diffusion from the titanium member through the bulk of molten filler to the ceramic was responsible to produce an active filler alloy in loco and promote reduction of the zirconium oxide to improve wetting on the c...

  11. In-situ synthesis of AgCu/Cu2O nanocomposite by mechanical alloying: The effect of the processing on the thermal behavior

    International Nuclear Information System (INIS)

    TG heating curves for Ag–Cu samples vs. the milling time, recorded during the heating. The samples’ mass variation is strongly dependent on the powders’ specific surface, respectively the milling time. - Highlights: • AgCu bimetallic composites reinforced by Cu2O has been studied. • The milling time influences the particle size distribution of the particles. • The thermal behavior of the mixtures has been studied by TG and DSC, in argon. • Correlation of thermal stability with thermal expansion properties was made. - Abstract: The influence of the mechanical alloying processing parameters on the elaboration of AgCu-based bimetallic matrix composites reinforced by in-situ synthesized Cu2O has been studied. The milling time (20, 45 and 80 h) of the initial 72% mass Ag + 28% mass Cu micrometric powders mixture influences the particle size distribution of the obtained composite particles. After 80 h of mechanical alloying, AgCu/Cu2O nanoparticles of 60–80 nm are obtained and their chemical composition at bulk/surface level has been determined by X-ray diffraction and photoelectron spectroscopy. The effect of milling time on the thermal behavior of the powders samples has been studied by thermogravimetry and differential scanning calorimetry measurements in argon atmosphere. The argon chemosorbtive reaction from the particles surface has been identified and the binding energy (0.9–1.99 eV) has been calculated. The isothermal drop calorimetry and the linear thermal expansion measurements were used to evaluate the correlation between thermal stability and thermal expansion properties of the in-situ synthesized AgCu/Cu2O nanocomposite

  12. Thermal Analysis of the Sn-Ag-Cu-In Solder Alloy

    DEFF Research Database (Denmark)

    Sopousek, J.; Palcut, Marián; Hodúlová, Erika;

    2010-01-01

    The tin-based alloy Sn-1.5Ag-0.7Cu-9.5In (composition in wt.%) is a potential candidate for lead-free soldering at temperatures close to 200°C due to the significant amount of indium. Samples of Sn-1.5Ag-0.7Cu-9.5In were prepared by controlled melting of the pure elements, followed by quenching...

  13. Short-range ferromagnetism in alloy ribbons of Fe-Cr-Si-Nb-(Ag, Cu)

    International Nuclear Information System (INIS)

    We have studied the magnetic properties of two amorphous alloy ribbons Fe72Cr6Si4Nb5B12Ag1 (FCSNB-Ag) and Fe72Cr6Si4Nb5B12Cu1 (FCSNB-Cu), prepared by using a melt-spinning technique. Magnetization (M) measurements for various temperatures (T) and magnetic fields (H) indicate that ferromagnetic-paramagnetic (FM-PM) phase transitions take place in FCSNB-Ag and FCSNB-Cu at Curie temperatures (TC ) of about 308.3 K and 322.5 K, respectively. Analyses of M - H data at different temperatures in the vicinity of the FM-PM phase transition based on the modified Arrott plot method and scaling hypothesis yielded the exponent values of β = 0.369 ± 0.005, γ = 1.359 ± 0.005 and δ = 4.7 ± 0.1 for FCSNB-Ag, and β = 0.376 ± 0.002, γ = 1.315 ± 0.006 and δ = 4.5 ± 0.1 for FCSNB-Cu. Compared with the values from theoretical models, these values are close to those expected for the 3D Heisenberg model, demonstrating the existence of short-range FM order in the amorphous alloy ribbons.

  14. Mechanical strength and its variability in Bi-modified Sn-Ag-Cu solder alloy

    Directory of Open Access Journals (Sweden)

    M. Matahir

    2011-05-01

    Full Text Available Purpose: Many previous work on Sn rich Pb-free soldering had focused on the evolution, morphology and the role of interfacial intermetallic compounds (IMC layers of Cu3Sn and Cu6Sn5 on the mechanical integrity of soldered joints. However recent studies had shown that under static shearing stress, more fracture failures had been found to occur through the solder and thus indicate the significance of solder microstructures in the joint integrity. In this work, we investigated the effect of Bi substitution for Sn on the shear strength of solder joints of near eutectic SAC alloy Sn3.5Ag0.9Cu.Design/methodology/approach: Ingot alloy were prepared from pure elements and their melting characteristics were followed with thermal analyses. Copper plates were soldered together in lap joints that were subjected to shear testing in the as-soldered conditions. The microstructures were followed by SEM and EDS.Findings: Results show that failures occurred in quasi-brittle manner, with large variability. The ternary SAC alloy had average shear strength of 30 MPa better than binary eutectic Sn/Cu. Small Bi substitution of Sn up to 2 wt% lead to increased average shear strengths with maximum strengths of about 50 MPa recorded for compositions with Bi content of 0.5 to 1.5 wt%. Bi substitutions beyond 2wt% gave substantially lower strength values. The application of Weibull criteria suggest untypical high variability in strength with Webuill moduli less than 10. Higher variability in shear strengths were found in compositions containing more than 2 wt.% Bi.Research limitations/implications: Micro-structural evidence suggest that the role of Bi in increasing strength may be related to the high solubility of Bi in Sn and this would have provided some solution hardening effect. Higher Bi content however, lead to the formation Bi rich phases in the microstructure and this would have affected the mechanics of deformation thus leading to generally lower strength values

  15. Short-range Ferromagnetism in Alloy Ribbons of Fe-Cr-Si-Nb-(Ag, Cu)

    DEFF Research Database (Denmark)

    Thanh, P. Q.; Hoa, N. Q.; Chau, N.;

    2014-01-01

    We have studied the magnetic properties of two amorphous alloy ribbons Fe72Cr6Si4Nb5B12Ag1 (FCSNB-Ag) and Fe72Cr6Si4Nb5B12Cu1 (FCSNB-Cu), prepared by using a melt-spinning technique. Magnetization (M) measurements for various temperatures (T) and magnetic fields (H) indicate that ferromagnetic......-paramagnetic (FM-PM) phase transitions take place in FCSNB-Ag and FCSNB-Cu at Curie temperatures (TC) of about 308.3 K and 322.5 K, respectively. Analyses of M - H data at different temperatures in the vicinity of the FM-PM phase transition based on the modified Arrott plot method and scaling hypothesis yielded...... the exponent values of beta = 0.369 +/- 0.005, gamma = 1.359 +/- 0.005 and delta = 4.7 +/- 0.1 for FCSNB-Ag, and beta = 0.376 +/- 0.002, gamma = 1.315 +/- 0.006 and delta = 4.5 +/- 0.1 for FCSNB-Cu. Compared with the values from theoretical models, these values are close to those expected for the 3D...

  16. Dose and Ion Current Density Dependence of the Topography Formed on the Surface of Ag/Cu Two-Phase Alloys Sputtered by 600 eV Ar

    Science.gov (United States)

    Pierson, K. W.; Hawes, C. D.; Krueger, T. D.; Stupak, J.

    1997-03-01

    The polished surface of a Ag/Cu (60/40 % atomic) alloy sample held at room temperature was bombarded by varying doses of normally incident 600 eV argon ions at 1.0 mA/cm^2. Fluences were varied from 7x10^16 to 7x10^19 ions/cm^2. The changes that occurred in the surface topography progressed through various stages. First, for fluences less than 10^18 ions/cm^2, selective sputtering of the higher yield Ag grains caused them to become recessed. Between 10^18 ions/cm^2 and 10^19 ions/cm^2 a transition occurs, conical features (seed cones) develop only on the surface of the Ag grains. The dense large aspect ratio cones decrease the sputtering yield of the Ag grains with the result that they now become raised above the Cu grains. At fluences greater than 10^19 ions/cm^2 the entire surface of the sample becomes densely covered with large aspect ration cones. The transition from selective sputtering to seed cone formation implies a threshold for surface coverage of "seed" atoms in order for cone formation to begin. Increasing the ion current density and holding the fluence constant greatly accelerated the transition to a densely cone covered surface.

  17. Reduced-Temperature Transient-Liquid-Phase Bonding of AluminaUsing a Ag-Cu-Based Brazing Alloy

    Energy Technology Data Exchange (ETDEWEB)

    Hong, Sung Moo; Glaeser, Andreas M.

    2005-12-19

    The mechanical properties and microstructural evolution ofmetal-ceramic bonds produced using a transient liquid phase (TLP) aredescribed. Alumina (Al2O3) was joined at 500 degrees C, 600 degrees C,and 700 degrees C using a multilayer In/Cusil-ABA (R) (commercialcopper-silver eutectic brazing alloy)/In interlayer. The introduction ofthin In cladding layers allows the system to bond at much lowertemperatures than those typically used for brazing with Cusil-ABA (R),thereby protecting temperature-sensitive components. After chemicalhomogenization, the interlayers retain an operating temperature rangesimilar to that of the brazed joints. TLP bonds made at 500 degrees C,600 degrees C, and 700 degrees C with holding times ranging from as lowas 1.5 h to 24 h had average fracture strengths above 220 MPa. Theeffects of bonding temperature and time on fracture strength aredescribed. Preliminary analysis of the interlayers shows that the Ag-Inor Cu-In intermetallic phases do not form. Considerations unique tosystems with two-phase core layers are discussed. Experiments usingsingle-crystal sapphire indicate rapid formation of a reaction layer at700 degrees C, suggesting the possibility of making strong bonds usinglower temperatures and/or shorter processing times.

  18. Comparison of Sn-Ag-Cu Solder Alloy Intermetallic Compound Growth Under Different Thermal Excursions for Fine-Pitch Flip-Chip Assemblies

    Science.gov (United States)

    Tian, Ye; Liu, Xi; Chow, Justin; Wu, Yi Ping; Sitaraman, Suresh K.

    2013-08-01

    The intermetallic compound (IMC) evolution in Cu pad/Sn-Ag-Cu solder interface and Sn-Ag-Cu solder/Ni pad interface was investigated using thermal shock experiments with 100- μm-pitch flip-chip assemblies. The experiments show that low standoff height of solder joints and high thermomechanical stress play a great role in the interfacial IMC microstructure evolution under thermal shock, and strong cross-reaction of pad metallurgies is evident in the intermetallic growth. Furthermore, by comparing the IMC growth during thermal aging and thermal shock, it was found that thermal shock accelerates IMC growth and that kinetic models based on thermal aging experiments underpredict IMC growth in thermal shock experiments. Therefore, new diffusion kinetic parameters were determined for the growth of (Cu,Ni)6Sn5 using thermal shock experiments, and the Cu diffusion coefficient through the IMC layer was calculated to be 0.2028 μm2/h under thermal shock. Finite-element models also show that the solder stresses are higher under thermal shock, which could explain why the IMC growth is faster and greater under thermal shock cycling as opposed to thermal aging.

  19. Microstructural evolution of a lead-free solder alloy Sn-Bi-Ag-Cu prepared by mechanical alloying during thermal shock and aging

    Science.gov (United States)

    Huang, M. L.; Wu, C. M. L.; Lai, J. K. L.; Chan, Y. C.

    2000-08-01

    In a previous study, a lead-free solder, Sn-6Bi-2Ag-0.5Cu, was developed by mechanical alloying. The alloy shows great potential as a lead-free solder system. In the present work, the microstructural evolution during thermal shock and aging was examined. In the as-soldered joints small bismuth (1 µm to 2 µm) and Ag3Sn (1 µm) particles were finely dispersed in a nearly pure tin matrix with a small amount of η-Cu6Sn5 phase in the bulk of solder. During thermal shock and aging microstructural evolution occurred with Cu-Sn intermetallic compound (IMC) layer growth at interface, bismuth phase coarsening and Ag3Sn phase coarsening. The microstructure of the solder appeared to be stable at high temperature. The shear strength of the present solder joint is higher than that of Sn-37Pb and Sn-3.5Ag solders. Shear failure occurred Cu-Sn IMC layer-solder interface and in the bulk of solder.

  20. Containerless solidification of Ag-Cu eutectic alloy under acoustic levitation condition%声悬浮条件下Ag-CU共晶合金的无容器凝固研究

    Institute of Scientific and Technical Information of China (English)

    耿德路; 解文军; 洪振宇; 魏炳波

    2011-01-01

    采用声悬浮技术结合激光加热,实现了Ag-Cu共晶合金的无容器熔化与凝固,并通过CMOS图像分析与数值计算,研究了声悬浮过程中合金熔体的温度场分布特性.由于声辐射压作用,合金熔体在声悬浮条件下呈现扁球或圆饼形,表面温度沿赤道点到极点方向升高.凝固样品表面出现涟漪状波纹,统计分析发现,该表面波纹出现在大变形(a/b>2.1)的样品上.波纹中心为共晶形核点,且波纹传播方向与共晶生长方向相同.分析表明,表面形核以及形核后辐射推移的固液界面是形成表面波纹的先决条件.声场的增强能够促进悬浮样品在表面形核.%The containerless melting and solidification of Ag-Cu eutectic alloy were accomplished by acoustic levitation together with laser heating. The temperature field of levitated alloy droplet was investigated through CMOS image processing and numerical calculation. Due to the effect of acoustic radiation pressure, the alloy droplets deform from spherical to oblate or disklike shapes. Their surface temperature rises along the meridian line from the equator to the poles during cooling process. Surface ripples are observed on those samples with greater deformation (a/b>2.1). And it is found that eutectic grains nucleate at the center of these ripples, and grow in the direction parallel to the propagation of ripples. The surface nucleation and the radial advance of solid-liquid interface are revealed to be the two key factors for the formation of surface ripples. The enhancement of sound pressure can induce the surface nucleation of levitated Ag-Cu eutectic alloy.

  1. Sn-Ag-Cu Nanosolders: Solder Joints Integrity and Strength

    Science.gov (United States)

    Roshanghias, Ali; Khatibi, Golta; Yakymovych, Andriy; Bernardi, Johannes; Ipser, Herbert

    2016-05-01

    Although considerable research has been dedicated to the synthesis and characterization of lead-free nanoparticle solder alloys, only very little has been reported on the reliability of the respective joints. In fact, the merit of nanoparticle solders with depressed melting temperatures close to the Sn-Pb eutectic temperature has always been challenged when compared with conventional solder joints, especially in terms of inferior solderability due to the oxide shell commonly present on the nanoparticles, as well as due to compatibility problems with common fluxing agents. Correspondingly, in the current study, Sn-Ag-Cu (SAC) nanoparticle alloys were combined with a proper fluxing vehicle to produce prototype nanosolder pastes. The reliability of the solder joints was successively investigated by means of electron microscopy and mechanical tests. As a result, the optimized condition for employing nanoparticles as a competent nanopaste and a novel procedure for surface treatment of the SAC nanoparticles to diminish the oxide shell prior to soldering are being proposed.

  2. Temperature stability of AgCu nanoparticles

    Energy Technology Data Exchange (ETDEWEB)

    Sopoušek, Jiří, E-mail: sopousek@mail.muni.cz; Zobač, Ondřej; Vykoukal, Vít [Masaryk University, Department of Chemistry, Faculty of Science (Czech Republic); Buršík, Jiří; Roupcová, Pavla [Institute of Physics of Materials ASCR (Czech Republic); Brož, Pavel; Pinkas, Jiří [Masaryk University, Department of Chemistry, Faculty of Science (Czech Republic); Vřešťál, Jan [Masaryk University, Central European Institute of Technology, CEITEC (Czech Republic)

    2015-12-15

    The colloidal solutions of the Ag–Cu nanoparticles (NPs, 10–32 nm) were prepared by solvothermal reactions. The samples of dried AgCu NPs and the resulting microstructures after heat treatment in air were investigated by various methods including electron microscopy (TEM, SEM) and high-temperature X-ray powder diffraction (HTXRD). The AgCu randomly mixed, Cu-rich, and Ag-rich face centred cubic crystal lattices were detected during the experiments. The temperature induced sintering was observed experimentally by HTXRD at 250 °C. The phase transformations at high temperatures were monitored by differential scanning calorimetry. The formation of the Ag-rich grains during heating in air and evolution of copper oxide microstructure were detected.Graphical abstract.

  3. The Reliability of Microalloyed Sn-Ag-Cu Solder Interconnections Under Cyclic Thermal and Mechanical Shock Loading

    Science.gov (United States)

    Mattila, Toni T.; Hokka, Jussi; Paulasto-Kröckel, Mervi

    2014-11-01

    In this study, the performance of three microalloyed Sn-Ag-Cu solder interconnection compositions (Sn-3.1Ag-0.52Cu, Sn-3.0Ag-0.52Cu-0.24Bi, and Sn-1.1Ag-0.52Cu-0.1Ni) was compared under mechanical shock loading (JESD22-B111 standard) and cyclic thermal loading (40 ± 125°C, 42 min cycle) conditions. In the drop tests, the component boards with the low-silver nickel-containing composition (Sn-Ag-Cu-Ni) showed the highest average number of drops-to-failure, while those with the bismuth-containing alloy (Sn-Ag-Cu-Bi) showed the lowest. Results of the thermal cycling tests showed that boards with Sn-Ag-Cu-Bi interconnections performed the best, while those with Sn-Ag-Cu-Ni performed the worst. Sn-Ag-Cu was placed in the middle in both tests. In this paper, we demonstrate that solder strength is an essential reliability factor and that higher strength can be beneficial for thermal cycling reliability but detrimental to drop reliability. We discuss these findings from the perspective of the microstructures and mechanical properties of the three solder interconnection compositions and, based on a comprehensive literature review, investigate how the differences in the solder compositions influence the mechanical properties of the interconnections and discuss how the differences are reflected in the failure mechanisms under both loading conditions.

  4. Mechanical, structural and thermal properties of Ag-Cu and ZnO reinforced polylactide nanocomposite films.

    Science.gov (United States)

    Ahmed, Jasim; Arfat, Yasir Ali; Castro-Aguirre, Edgar; Auras, Rafael

    2016-05-01

    Plasticized polylactic acid (PLA) based nanocomposite films were prepared by incorporating polyethylene glycol (PEG) and two selected nanoparticles (NPs) [silver-copper (Ag-Cu) alloy (<100nm) and zinc oxide (ZnO) (<50 and <100nm)] through solvent casting method. Incorporation of Ag-Cu alloy into the PLA/PEG matrix increased the glass transition temperature (Tg) significantly. The crystallinity of the nanocomposites (NCs) was significantly influenced by NP incorporation as evidenced from differential scanning calorimetry (DSC) and X-ray diffraction (XRD) analysis. The PLA nanocomposite reinforced with NPs exhibited much higher tensile strength than that of PLA/PEG blend. Melt rheology of NCs exhibited a shear-thinning behavior. The mechanical property drastically reduced with a loading of NPs, which is associated with degradation of PLA. SEM micrographs exhibited that both Ag-Cu alloy and ZnO NPs were dispersed well in the PLA film matrix. PMID:26893045

  5. Mechanism for silicide formation in Ag(Cu)/Si and Ag(Co)/Si upon annealing

    International Nuclear Information System (INIS)

    Ag(Co) alloy and Ag(Cu) alloy films were prepared on HF-cleaned Si by using DC magnetron sputtering and were then annealed in vacuum (3 X 10-5 Torr) to investigate the effects of Co and Cu precipitation on the material properties of the Ag alloy films and on the reaction between alloy element (Co, Cu) and Si. The annealing of a Ag(Cu)/Si structure for 30 min at 200 .deg. C produced a uniform Cu3Si layer at the Ag(Cu)-Si interface, as a result of reaction of the segregated Cu with Si. This lowered the resistivity from 5.3 to 3.2 μΩ-cm, and also led to improved adhesion properties. In contrast, the annealing of a Ag(Co)/Si structure at 400 .deg. C produced a cobalt silicide in the Ag(Co) film, resulting from reaction of the diffused Si with Co precipitates, probably at the grain boundaries. The Co silicide formed at 400 .deg. C slightly increased the resistivity, which continued to decrease at temperatures of 500 .deg. C and higher. The different diffusing species in formation of Co silicide and Cu silicide may be attributed to the difference in the temperature of silicde formation and the mobility of the species.

  6. The evolution of interface microstructure in a ZrO2/Ag-Cu-Al-Ti system

    International Nuclear Information System (INIS)

    Among ceramic/metal (C/M) joining technologies, the active filler metal method has been studied extensively due to the simple brazing process and excellent joint strength. Active metal elements, typically Ti, are intentionally added to braze alloys to enhance the formation of reaction products between the ceramic and the braze metal at the C/M interface. In the brazing of Al2O3 with the Ag-Cu-Ti filler metal, reaction products such as γ-TiO, Cu2(Ti, Al)4O, Ti3(Cu0.76Al0.18Sn0.06)3O were found, while products such as Ti5Si3 and TiN formed in the brazing of Si3N4. The presence of reaction layers at the C/M interface influences the interface strength in a complex way. In Cu/Al2O3, Co/Al2O3, Ni/Al2O3, and Cu/diamond systems, maxima of joint strength were observed at some intermediate Ti addition, while the flexural strength decreased substantially with the thickening of the TiO layer in a ZrO2/Ag-Cu-Sn-Ti system. Thus, composition of the braze alloy (particularly, the content of the active metal), process conditions such as brazing temperature and time, microstructure and mechanical properties of reaction products at the C/M interfaces, interfacial chemistry, and residual stress are primary factors to be studied in order to understand the strengths of the C/M interfaces systematically. In the present and the following papers, evolutions of interfacial microstructures at various brazing conditions, and corresponding interface strengths are reported, respectively, for a ZrO2/Ag-Cu-Al-Ti system

  7. 脉冲红外和热导检测法测定银铜合金中氧、氮含量%Pulsed Infrared and Thermal Conductivity Detection Method in the Determination of Oxygen - nitrogen Content in Ag - Cu Alloy

    Institute of Scientific and Technical Information of China (English)

    刘伟; 王应进; 蔡文云; 何姣; 贺胜男

    2011-01-01

    A method to detect the oxygen and nitrogen contents in Ag - Cu alloy was established with measuring ranges of 0.0005% ~0.02% for oxygen and 0.0001% ~0.02% for nitrogen. Using a oxygen -nitrogen analyzer with helium as the carrier gas, the sample was melt down in a heated graphite crucible. CO and CO2 were generated by oxygen and carbon and CO was catalytically oxydized to CO2 by rare earth -copper oxide. The CO2 absorption peak was measured in the infrared detection pool. Nitrogen was turned into N2 gas and was loaded into the thermal conductivity cell by helium gas to detect the heat conductivity. Mass fractions of oxygen and nitrogen were then calculated by the computer. In the samples,the relative standard deviations( RSD, n = 7)of 0. 0026% and 0. 0075% oxygen were separately 10.6% and 3.9%, with 100.5% and 100.9% of the standard addition recoveries. The relative standard deviations (RSD,n =7)of 0. 00075% and 0. 00013% nitrogen were separately 15.0% and 15.2% with 85.2% and 85.9% of the standard addition recoveries. The process is simple, convinient and timesaving. After putting into use in the analysis work of the practical samples, the experimental results are satisfactory.%建立了银铜合金中氧和氮含量的测定方法,测定范围为氧0.0005%~0.02%,氮0.0001%~0.02%.采用氧氮分析仪测定,以氦气为载气,样品在加热的石墨坩埚中熔融,氧与碳生成CO和CO2,CO被稀土氧化铜催化氧化成CO2,进入红外检测池测定CO2吸收峰,氮以氮气形态进入热导池测定热导率的变化,计算机换算出氧和氮的质量分数.样品中0.0026%、0.0075%的氧的相对标准偏差(RSD,n=7)分别为10.6%和3.9%,加标回收率为100.5%和100.9%;0.00075%、0.00013%的氮的RSD(n=7)分别为15.0%和15.2%,加标回收率为85.2%和85.9%.方法简便快速.已用于实际样品分析工作,结果满意.

  8. Brief Introduction to the Journal SPECIAL CASTING & NON-FERROUS ALLOYS

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    The Journal of SPECIAL CASTING & NON-FERROUS ALLOYS cosponsored by Foundry Institution of Chinese Mechanical Engineering Society (FICMES)and Wuhan Machinery Technology institute. Appoved by National Science and Technology Committee of China as state-wide periodical. Issued both home and abroad, one of the core journals of China. Indexed in CHINESE ACADEMIC JOURNAL(CD)for Chinese Scientific and technical papers statistics and analysis. Cited by EI, CA etc. Domestic and foreign authoritative data base and...

  9. Facile preparation of Ag-Cu bifunctional electrocatalysts for zinc-air batteries

    International Nuclear Information System (INIS)

    Highlights: • Ag-Cu dendrites are observed for the first time to exhibit high catalytic activity for oxygen reduction reaction. • Ag-Cu dendrites are directly synthesized through galvanic displacement on the current collector layer made of Ni foams. • A bifunctional air cathode is fabricated using Ag-Cu dendrites as a carbon-free, binder-free catalyst layer. • Both the primary and rechargeable zinc–air batteries fabricated by Ag-Cu catalysts exhibit excellent performance. - ABSTRACT: An inexpensive, facile galvanic displacement reaction for the direct growth of silver–copper (Ag-Cu) catalysts on nickel foams is developed for the first time. The resulting Ag-Cu catalysts exhibit dendritic morphologies. Ag and Cu atoms are in their metallic state while the presence of CuO and Cu2O are limited on the surface of catalyst. The catalysts demonstrate high catalytic activity for oxygen reduction reaction (ORR) in alkaline solution, as evaluated by both linear scanning voltammetry and rotating disk electrode polarization measurements. The ORR catalysed by Ag-Cu catalyst in alkaline solution proceeds through a four-electron pathway. An air cathode is fabricated using Ag-Cu catalyst as a carbon-free, binder-free catalyst layer. Using this Ag-Cu catalyst based air cathode, both the primary and rechargeable zinc-air batteries show excellent battery performance. The specific capacity of the primary zinc-air battery is 572 mAh g−1. Especially, the rechargeable zinc-air battery shows high round-trip efficiency, appealing stability at a long charge-discharge cycle period

  10. Active Brazing of C/C Composite to Copper by AgCuTi Filler Metal

    Science.gov (United States)

    Zhang, Kexiang; Xia, Lihong; Zhang, Fuqin; He, Lianlong

    2016-05-01

    Brazing between the carbon-fiber-reinforced carbon composite (C/C composite) and copper has gained increasing interest because of its important application in thermal management systems in nuclear fusion reactors and in the aerospace industry. In order to examine the "interfacial shape effect" on the mechanical properties of the joint, straight and conical interfacial configurations were designed and machined on the surface of C/C composites before joining to copper using an Ag-68.8Cu-4.5Ti (wt pct) alloy. The microstructure and interfacial microchemistry of C/C composite/AgCuTi/Cu brazed joints were comprehensively investigated by using high-resolution transmission electron microscopy. The results indicate that the joint region of both straight and conical joints can be described as a bilayer. Reaction products of Cu3Ti3O and γ-TiO were formed near the copper side in a conical interface joint, while no reaction products were found in the straight case. The effect of Ag on the interfacial reaction was discussed, and the formation mechanism of the joints during brazing was proposed. On the basis of the detailed microstructure presented, the mechanical performance of the brazed joints was discussed in terms of reaction and morphology across the joint.

  11. Ag-Cu Bimetallic Nanoparticles Prepared by Microemulsion Method as Catalyst for Epoxidation of Styrene

    Directory of Open Access Journals (Sweden)

    Hong-Kui Wang

    2012-01-01

    Full Text Available Ag/Cu bimetallic nanocatalysts supported on reticulate-like γ-alumina were prepared by a microemulsion method using N2H4·H2O as the reducing agent. The catalysts were activated by calcination followed with hydrogen reduction at 873K, and the properties were confirmed using various characterization techniques. Compared with metal oxides particles, Ag-Cu particles exhibited smaller sizes (<5 nm after calcination in H2 at 873K. XPS results indicated that the binding energies changed with the Ag/Cu ratios, suggesting that increasing the copper content gave both metals a greater tendency to lose electrons. Furthermore, Ag-Cu bimetallic nanoparticles supported on γ-alumina showed better catalytic activity on the epoxidation of styrene as compared with the corresponding monometallic silver or copper. The styrene oxide selectivity could reach 76.6% at Ag/Cu molar ratio of 3/1, while the maximum conversion (up to 94.6% appeared at Ag/Cu molar ratio of 1/1 because of the maximum interaction between silver and copper.

  12. Phase constitution and interface structure of nano-sized Ag-Cu/AlN multilayers: Experiment and ab initio modeling

    International Nuclear Information System (INIS)

    Nano-sized Ag-Cu8nm/AlN10nm multilayers were deposited by reactive DC sputtering on α-Al2O3(0001) substrates. Investigation of the phase constitution and interface structure of the multilayers evidences a phase separation of the alloy sublayers into nanosized grains of Ag and Cu. The interfaces between the Ag grains and the quasi-single-crystalline AlN sublayers are semi-coherent, whereas the corresponding Cu/AlN interfaces are incoherent. The orientation relationship between Ag and AlN is constant throughout the entire multilayer stack. These observations are consistent with atomistic models of the interfaces as obtained by ab initio calculations.

  13. Intermetallic compound formation in Sn-Co-Cu, Sn-Ag-Cu and eutectic Sn-Cu solder joints on electroless Ni(P) immersion Au surface finish after reflow soldering

    International Nuclear Information System (INIS)

    The interfacial reactions between Sn-0.4Co-0.7Cu eutectic alloy and immersion Au/electroless Ni(P)/Cu substrate were investigated after reflow soldering at 260 deg. C for 2 min. Common Sn-4.0Ag-0.5Cu and eutectic Sn-0.7Cu solders were used as reference. Two types of intermetallic compounds (IMC) were found in the solder matrix of the Sn-0.4Co-0.7Cu alloy, namely coarser CoSn2 and finer Cu6Sn5 particles, while only one ternary (Cu, Ni)6Sn5 interfacial compound was detected between the solder alloy and the electroless nickel and immersion gold (ENIG) coated substrate. The same trend was also observed for the Sn-Ag-Cu and Sn-Cu solder joints. Compared with the CoSn2 particles found in the Sn-Co-Cu solder and the Ag3Sn particles found in the Sn-Ag-Cu solder, the Cu6Sn5 particles found in both solder systems exhibited finer structure and more uniform distribution. It was noted that the thickness of the interfacial IMCs for the Sn-Co-Cu, Sn-Ag-Cu and Sn-Cu alloys was 3.5 μm, 4.3 μm and 4.1 μm, respectively, as a result of longer reflow time above the alloy's melting temperature since the Sn-Ag-Cu solder alloy has the lowest melting point

  14. Intermetallic compound formation in Sn-Co-Cu, Sn-Ag-Cu and eutectic Sn-Cu solder joints on electroless Ni(P) immersion Au surface finish after reflow soldering

    Energy Technology Data Exchange (ETDEWEB)

    Sun Peng [Key State Lab for New Displays and System Integration (Chinese Ministry of Education), SMIT Center, Shanghai University, 200072 Shanghai (China) and Department of Microtechnology and Nanoscience, SMIT Center, Chalmers University of Technology, 412-96 Goeteborg (Sweden)]. E-mail: peng.sun@mc2.chalmers.se; Andersson, Cristina [Department of Microtechnology and Nanoscience, SMIT Center, Chalmers University of Technology, 412-96 Goeteborg (Sweden); Wei Xicheng [Key State Lab for New Displays and System Integration (Chinese Ministry of Education), SMIT Center, Shanghai University, 200072 Shanghai (China); Cheng Zhaonian [Department of Microtechnology and Nanoscience, SMIT Center, Chalmers University of Technology, 412-96 Goeteborg (Sweden); Shangguan Dongkai [Flextronics International, San Jose, CA (United States); Liu Johan [Key State Lab for New Displays and System Integration (Chinese Ministry of Education), SMIT Center, Shanghai University, 200072 Shanghai (China); Department of Microtechnology and Nanoscience, SMIT Center, Chalmers University of Technology, 412-96 Goeteborg (Sweden)

    2006-11-25

    The interfacial reactions between Sn-0.4Co-0.7Cu eutectic alloy and immersion Au/electroless Ni(P)/Cu substrate were investigated after reflow soldering at 260 deg. C for 2 min. Common Sn-4.0Ag-0.5Cu and eutectic Sn-0.7Cu solders were used as reference. Two types of intermetallic compounds (IMC) were found in the solder matrix of the Sn-0.4Co-0.7Cu alloy, namely coarser CoSn{sub 2} and finer Cu{sub 6}Sn{sub 5} particles, while only one ternary (Cu, Ni){sub 6}Sn{sub 5} interfacial compound was detected between the solder alloy and the electroless nickel and immersion gold (ENIG) coated substrate. The same trend was also observed for the Sn-Ag-Cu and Sn-Cu solder joints. Compared with the CoSn{sub 2} particles found in the Sn-Co-Cu solder and the Ag{sub 3}Sn particles found in the Sn-Ag-Cu solder, the Cu{sub 6}Sn{sub 5} particles found in both solder systems exhibited finer structure and more uniform distribution. It was noted that the thickness of the interfacial IMCs for the Sn-Co-Cu, Sn-Ag-Cu and Sn-Cu alloys was 3.5 {mu}m, 4.3 {mu}m and 4.1 {mu}m, respectively, as a result of longer reflow time above the alloy's melting temperature since the Sn-Ag-Cu solder alloy has the lowest melting point.

  15. Interplay between structural symmetry and magnetism in Ag-Cu

    Science.gov (United States)

    Yen, Tsung-Wen; Lai, S. K.

    2016-01-01

    We present first-principles theoretical calculations of the magnetic properties of bimetallic clusters Ag-Cu. The calculations proceeded by combining a previously developed state-of-the-art optimization algorithm (P.J. Hsu, S.K. Lai, J. Chem. Phys. 124 (2006) 0447110) with an empirical potential and applied this numerical scheme to determine first the lowest energy structures of pure clusters Ag38 and Cu38, and also their different atomic compositions AgnCu38-n for n=1,2,…,37. Then, we carried out the Kohn-Sham spin unrestricted density functional theory calculations on the optimized atomic structures obtained in the preceding step. Given the minimized structures from the first step as input configurations, the results of these re-optimized structures by full density functional theory calculations yield more refined electronic and atomic structures. A thorough comparison of the structural differences between these two sets of atomic geometries, one from using an empirical potential in which the electronic degrees of freedom were included approximately and another from subsequent minimization using the spin unrestricted density functional theory, sheds light on how the electronic charges disperse near atoms in clusters AgnCu38-n, and hence the distributions of electronic spin and charge densities at re-optimized sites of the cluster. These data of the electronic dispersion and the ionic configuration give clue to the mystery of the unexpected net magnetic moments which were found in some of the clusters AgnCu38-n at n=1-4, 24 as well as the two pure clusters. Possible origins for this unanticipated magnetism were explained in the context of the point group theory in much the same idea as the Clemenger-Nilsson model applied to simple metal clusters except that we draw particular attention to the atomic topologies and stress the bearing that they have on valence electrons in inducing them to disperse and occupy different molecular orbital energy levels.

  16. High-temperature thermal expansion and structural behaviour of stromeyerite, AgCuS

    International Nuclear Information System (INIS)

    Results of simultaneous thermal analysis, synchrotron and neutron powder diffraction in the range from room temperature up to the melting point at 936 K on non-superionic orthorhombic β-AgCuS as well as on superionic hexagonal α- and cubic δ-AgCuS are reported. On heating the sample is only stable in argon. The following phase transitions occur in AgCuS at elevated temperatures: β361K → α399K →α+δ 439K→δ. The volume changes at the superionic β→α and α→δ phase transitions are about 2.3 and 0.6%. The volume thermal expansion coefficients are 26 x 10-6, 130 x 10-6 and 85 x 10-6 K-1 for the pure β-, α- and δ-phases, respectively. Models for the average structures of α- and δ-AgCuS are proposed and discussed. Ionic conductivity in δ-AgCuS may originate from cation jumps in 'skewed' directions between nearest-neighbour tetrahedral sites via the peripheries of the octahedral cavities. A correlation between the temperature dependence of the cation redistribution in δ-AgCuS and the temperature dependence of the ionic conductivity is assumed. A two-dimensional nature of the ionic conductivity due to cation jumps in slabs perpendicular to the c-direction is supposed for α-AgCuS. There is no evidence for ionic diffusion through the (1/2, 1/2, 1/2) site in directions in either superionic α- or δ-phases

  17. AgCuVO{sub 4}: A quasi one-dimensional S=1/2 compound

    Energy Technology Data Exchange (ETDEWEB)

    Moeller, Angela; Taetz, Timo [Universitaet zu Koeln (Germany). Institut fuer Anorganische Chemie; Schmitt, Miriam; Rosner, Helge [Max Planck Institute for Chemical Physics of Solids, Dresden (Germany)

    2009-07-01

    Recently, we have been able to synthesize the new copper-orthovanadate AgCuVO{sub 4}. The crystal structure was determined by single crystal x-ray diffraction. AgCuVO{sub 4} comprises Cu{sup 2+} ions coordinated by oxygen in a square-planar fashion, similar to LiCuVO{sub 4}, which has been identified as a multiferroic material recently. Whereas in LiCuVO{sub 4} the square-planar [CuO{sub 4}] units are connected via edges to form chains along the crystallographic b axis, the [CuO{sub 4}] units in AgCuVO{sub 4} are connected via corners resulting in Cu-O-Cu chains along the b-axis. The static magnetic susceptibility of AgCuVO{sub 4} can be described quite well within a Bonner-Fisher spin-chain scenario. In order to gain microscopic insight into the the electronic structure and the magnetic exchange interactions of AgCuVO{sub 4}, we performed LDA band structure calculations. To take the strong Coulomb repulsion at the Cu site into account, we mapped the LDA results onto a tight binding model and subsequently onto a Heisenberg model. In agreement with the experimental data, we find pronounced one-dimensional magnetic exchange along the b axis with small inter-chain couplings.

  18. Effects of processing parameters on microstructure and mechanical behavior of SiO2/Ti-6Al-4V joint brazed with AgCu/Ni interlayer

    International Nuclear Information System (INIS)

    SiO2 glass ceramic has been successfully joined to Ti-6Al-4V alloy with AgCu/Ni composite interlayer. The brazing temperature varies from 950 deg. C to 980 deg. C, with the holding time ranging from 1 min to 45 min. AgCu eutectic foil melted first, followed by the Ti-Cu-Ni ternary eutectic reaction, then Ti reacted to SiO2 glass ceramic. All of Ti atoms came from Ti-6Al-4V alloy but not from braze alloy. The effects of brazing temperature and dwelling time on interface structure and joint strength were investigated in the present work. The largest shear strength of brazed joint could reach 110 MPa when the brazing temperature was 970 deg. C, holding time was 10 min, and fracture occurred in the SiO2 glass ceramic part. While the thin reaction layer at SiO2 side is the weak part of the joint when the brazing parameter is not appropriate.

  19. Effect of Rapid Thermal Processing on the structural and device properties of (Ag,Cu)(In,Ga)Se2 thin film solar cells

    International Nuclear Information System (INIS)

    (AgwCu1−w)(In1−xGax)Se2 alloy absorber layers with w ≈ 0.8 and x ≈ 0.78 ratios were deposited using multi-source elemental evaporation and analyzed by glancing incidence X-ray diffraction, scanning electron microscopy combined with energy dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy. The effect of Rapid Thermal Processing (RTP) on the structure and composition of the near-surface layers was investigated. It was found that the RTP doesn't have a noticeable effect on the grain size and roughness of the film surface. On the other hand, additional reflections of the films with 0.5 ≤ Ga/(Ga + In) < 1 and Ag/(Ag + Cu) > 0.5, due to an ordered defect phase which is confined to the near-surface region of the film, are completely diminished after RTP with excess Se present. X-ray photoelectron spectroscopy results show that RTP with excess Se present altered the distribution of elements, rendering the film surface less group I deficient after that process. Consequently, atomic ratios were changed from the composition of I1III5VI8 compound to the composition close to that of I1III3VI5 ordered defect phase. Additionally, the RTP treatment, especially with excess Se, significantly enhanced solar cell efficiency performance due to an improvement in the open circuit voltage. - Highlights: ► Rapid Thermal Processing (RTP) of (Ag,Cu)(In,Ga)Se2 alloy films was investigated. ► It was found that RTP with excess Se supply improves solar cell properties. ► RTP with excess Se eliminated (Ag,Cu)(In,Ga)5Se8 phases. ► RTP with excess Se also reduced group I elements at the film surfaces

  20. Investigation of superionic AgCuSe conductor by inelastic neutron scattering

    International Nuclear Information System (INIS)

    The lattice dynamics of the ternary superionic compound AgCuSe was studied for both superionic α-phase and the non-superionic β-phase. Inelastic neutron scattering in polycrystalline β-AgCuSe indicates the presence of low-energy peaks in the dynamic structure factor at energy 3-4 meV. Most probably, these low-energy modes are caused by acoustic phonons. The main difference between the neutron weighted generalized function of phonon states density of the non-superionic and superionic silver-copper selenide consists in a smearing of the strongly pronounced maxima at 10 and 20 meV in α-AgCuSe

  1. Effect of the Vibrational Modes on the Ag-Cu Phase Diagram

    Institute of Scientific and Technical Information of China (English)

    DUAN Su-Qing; ZHAO Xian-Geng; LIU Shao-Jun; MA Ben-Kun

    2000-01-01

    We calculated the vibrational free energies of the selected ordered compounds in the Ag-Cu system by using two kinds of methods: (1) calculating the phonon dispersion and density of states and the consequently vibrational free energies by using the method of ab initio inverted interatomic potentials and dynamic matrix; (2) the vibrational free energies determined by a Debye-Griineisen approximation. The Ag-Cu phase diagram is calculated by the cluster variation method. The results show that the solubility at Ag-rich end of the calculated phase diagram considering vibrational modes by using the first method is in better agreement with the experimental.

  2. Low-Temperature Interface Reaction between Titanium and the Eutectic Silver-Copper Brazing Alloy

    OpenAIRE

    Andrieux, J; Dezellus, Olivier; Bosselet, F.; Viala, J.C.

    2009-01-01

    Reaction zones formed at 790 °C between solid titanium and liquid Ag-Cu eutectic alloys (pure and Ti-saturated) have been characterized. When pure Ag-Cu eutectic alloy with 40 at.% Cu is used, the interface reaction layer sequence is: alpha-Ti / Ti2Cu / TiCu / Ti3Cu4 / TiCu4 / L. Because of the fast dissolution rate of Ti in the alloy, the reaction zone remains very thin (3-6 µm) whatever the reaction time. When the Ag-Cu eutectic alloy is saturated in titanium, dissolution no longer proceeds...

  3. Ag-Cu Colloid Synthesis: Bimetallic Nanoparticle Characterisation and Thermal Treatment

    Czech Academy of Sciences Publication Activity Database

    Sopoušek, J.; Pinkas, J.; Brož, P.; Buršík, Jiří; Vykoukal, V.; Škoda, D.; Stýskalík, A.; Zobač, O.; Vřešťál, J.; Hrdlička, A.; Šimbera, J.

    2014-01-01

    Roč. 2014, ID 638964 (2014), s. 1-13. ISSN 1687-4110 R&D Projects: GA MŠk(CZ) ED1.1.00/02.0068 Institutional support: RVO:68081723 Keywords : Ag-Cu nanoparticles * DSC * TEM Subject RIV: BJ - Thermodynamics Impact factor: 1.644, year: 2014

  4. Atomic-scale investigation of interface-facilitated deformation twinning in severely deformed Ag-Cu nanolamellar composites

    Energy Technology Data Exchange (ETDEWEB)

    An, X. H., E-mail: anxianghai@gmail.com, E-mail: xiaozhou.liao@sydenye.edu.au; Cao, Y.; Liao, X. Z., E-mail: anxianghai@gmail.com, E-mail: xiaozhou.liao@sydenye.edu.au [School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, Sydney, New South Wales 2006 (Australia); Zhu, S. M.; Nie, J. F. [Department of Materials Engineering, Monash University, Melbourne, Victoria 3800 (Australia); Kawasaki, M. [Division of Materials Science and Engineering, Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul 133-791 (Korea, Republic of); Ringer, S. P. [School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, Sydney, New South Wales 2006 (Australia); Australian Centre for Microscopy and Microanalysis, The University of Sydney, Sydney, New South Wales 2006 (Australia); Langdon, T. G. [Departments of Aerospace and Mechanical Engineering and Materials Science, University of Southern California, Los Angeles, California 90089-1453 (United States); Materials Research Group, Faculty of Engineering and the Environment, University of Southampton, Southampton SO17 1BJ (United Kingdom); Zhu, Y. T. [Department of Materials Science and Engineering, North Carolina State University, Raleigh, North Carolina 27695-7919 (United States); School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing (China)

    2015-07-06

    We report an atomic-scale investigation of interface-facilitated deformation twinning behaviour in Ag-Cu nanolamellar composites. Profuse twinning activities in Ag supply partial dislocations to directly transmit across the Ag-Cu lamellar interface that promotes deformation twinning in the neighbouring Cu lamellae although the interface is severely deformed. The trans-interface twin bands change the local structure at the interface. Our analysis suggests that the orientation relationship and interfacial structure between neighbouring Ag-Cu lamellae play a crucial role in such special interface-facilitated twinning behaviour.

  5. Atomic-scale investigation of interface-facilitated deformation twinning in severely deformed Ag-Cu nanolamellar composites

    International Nuclear Information System (INIS)

    We report an atomic-scale investigation of interface-facilitated deformation twinning behaviour in Ag-Cu nanolamellar composites. Profuse twinning activities in Ag supply partial dislocations to directly transmit across the Ag-Cu lamellar interface that promotes deformation twinning in the neighbouring Cu lamellae although the interface is severely deformed. The trans-interface twin bands change the local structure at the interface. Our analysis suggests that the orientation relationship and interfacial structure between neighbouring Ag-Cu lamellae play a crucial role in such special interface-facilitated twinning behaviour

  6. Mirroring the dynamic magnetic behavior of magnetostrictive Co/(Ag,Cu,Ta) multilayers grown onto rigid and flexible substrates

    Energy Technology Data Exchange (ETDEWEB)

    Agra, K.; Gomes, R.R. [Departamento de Física, Universidade Federal do Rio Grande do Norte, 59078-900 Natal, RN (Brazil); Della Pace, R.D. [Departamento de Física, Universidade Federal de Santa Catarina, 88040-900 Florianópolis, SC (Brazil); Departamento de Física, Universidade Federal de Santa Maria, 97105-900 Santa Maria, RS (Brazil); Dorneles, L.S. [Departamento de Física, Universidade Federal de Santa Maria, 97105-900 Santa Maria, RS (Brazil); Bohn, F. [Departamento de Física, Universidade Federal do Rio Grande do Norte, 59078-900 Natal, RN (Brazil); Corrêa, M.A., E-mail: marciocorrea@dfte.ufrn.br [Departamento de Física, Universidade Federal do Rio Grande do Norte, 59078-900 Natal, RN (Brazil)

    2015-11-01

    We investigate the magnetoimpedance effect in a wide frequency range in magnetostrictive Co/(Ag,Cu,Ta) multilayers grown onto rigid and flexible substrates. We observe a direct correlation between structural and quasi-static magnetic properties and the magnetoimpedance effect, since they are directly dependent on the nature of the spacer material. Moreover, we verify that all these properties are insensitive to the kind of employed substrate. We compare the magnetoimpedance results measured for multilayers in rigid and flexible substrates and discuss them in terms of different mechanisms that govern the impedances changes, magnetic anisotropy, structural character, and of numerical calculation results found in the literature. The fact that magnetostrictive multilayers can be reproduced in distinct kinds of substrates corresponds to an important advance for their applicability. The results place multilayers grown onto flexible substrates as attractive candidates for application as probe element in the development of MI-based sensor devices. - Highlights: • Correlation between structural and magnetic properties. • Dynamic magnetic behavior of multilayers trough MI effect. • Mirroring the dynamic magnetic behavior in flexible and rigid substrates. • Flexible substrate applications for magnetostrictive alloys.

  7. Effects of bismuth on growth of intermetallic compounds in Sn-Ag-Cu Pb-free solder joints

    Institute of Scientific and Technical Information of China (English)

    LI Guo-yuan; SHI Xun-qing

    2006-01-01

    The effects of Bi addition on the growth of intermetallic compound (IMC) formation in Sn-3.8Ag-0.7Cu solder joints were investigated. The test samples were prepared by conventional surface mounting technology. To investigate the element diffusion and the growth kinetics of intermetallics formation in solder joint,isothermal aging test was performed at temperatures of 100,150,and 190 ℃,respectively. The optical microscope (OM) and scanning electron microscope (SEM) were used to observe microstructure evolution of solder joint and to estimate the thickness and the grain size of the intermetallic layers. The IMC phases were identified by energy dispersive X-ray (EDX) and X-ray diffractometer (XRD). The results clearly show that adding about 1.0% Bi in Sn-Ag-Cu solder alloy system can refine the grain size of the IMC and inhibit the excessive IMC growth in solder joints,and therefore improve the reliability of the Pb-free solder joints. Through observation of the microstructural evolution of the solder joints,the mechanism of inhibition of IMC growth due to Bi addition was proposed.

  8. Damage behavior of SnAgCu/Cu solder joints subjected to thermomechanical cycling

    International Nuclear Information System (INIS)

    Highlights: •A creep–fatigue damage model based on CDM was proposed. •Designed system includes load frame, strain measure device and damage test device. •Damage evolution of solder joints was a function of accumulated inelastic strain. •Damage of solder joints is an interaction between creep and low-cycle fatigue. -- Abstract: Thermomechanical fatigue damage is a progressive process of material degradation. The objective of this study was to investigate the damage behavior of SnAgCu/Cu solder joints under thermomechanical cycling. A damage model was proposed based on continuum damage mechanics (CDM). Based upon an analysis of displacements for flip-chip solder joints subjected to thermal cycling, a special bimetallic loading frame with single-solder joint samples was designed to simulate the service conditions of actual joints in electronic packages. The assembly, which allowed for strain measurements of an individual solder joint during temperature cycling, was used to investigate the impact of stress–strain cycling on the damage behavior of SnAgCu/Cu solder joints. The characteristic parameters of the damage model were determined through thermomechanical cycling and strain measurement tests. The damage variable D = 1 − R0/R was selected, and values for it were obtained using a four-probe method for the single-solder joint samples every dozen cycles during thermomechanical cycling tests to verify the model. The results showed that the predicted damage was in good agreement with the experimental results. The damage evolution law proposed here is a function of inelastic strain, and the results showed that the damage rate of SnAgCu/Cu solder joints increased as the range of the applied strain increased. In addition, the microstructure evolution of the solder joints was analyzed using scanning electron microscopy, which provided the microscopic explanation for the damage evolution law of SnAgCu/Cu solder joints

  9. Experimental study of the ternary Ag-Cu-In phase diagram

    International Nuclear Information System (INIS)

    The phase diagram of the Ag-Cu-In system was investigated using powder X-ray diffraction (XRD), differential scanning calorimetry (DSC) and electron probe microanalysis (EPMA). Two isothermal sections (at 510 and 607 deg. C) and 15 isopletic sections were studied. The results showed seven ternary peritectics, one ternary eutectic and one ternary metatectic. A complete reaction scheme was constructed, the valleys were drawn and the liquidus surfaces were derived from DSC data in the entire composition range.

  10. Preparation of Ag/Cu Janus nanowires: Electrodeposition in track-etched polymer templates

    Energy Technology Data Exchange (ETDEWEB)

    Zhu, X.R. [Henan Key Laboratory of Ion Beam Bioengineering, Physical Engineering College, Zhenzhou University, Zhengzhou 450052 (China); Wang, C.M.; Fu, Q.B. [State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871 (China); Jiao, Z.; Wang, W.D.; Qin, G.Y. [Henan Key Laboratory of Ion Beam Bioengineering, Physical Engineering College, Zhenzhou University, Zhengzhou 450052 (China); Xue, J.M., E-mail: jmxue@pku.edu.cn [State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871 (China)

    2015-08-01

    Highlights: • In this paper, we introduce a simple method for preparation of Janus nanowires by electrodeposition. • Using ion-track-etched PC polymer templates and commercial PC track-etched membrane templates, Ag/Cu Janus nanowires fabricated by this method all have uniform size. No matter how the holes array in the template, regular or not, the nanowires prepared by this method have similar properties. • By controlling the etching time, the size of the nanowires could be controlled easily and special shape nanowires also can be prepared by this template. • The polymer template is very easy to dissolve thoroughly and has no damage to nanowires almost. It is suitable for the preparation of nanowires suspension. • This method also has better applicability for polymer templates and can be seen as a simple convenient method for the preparation of Ag/Cu Janus nanowires. - Abstract: Bimetal (Janus) nanowire has been widely used as a promising nanoscale motor. In this paper we present a highly controllable method to fabricate Ag/Cu Janus nanowires using track-etched polymer templates. Ag/Cu Janus nanowires with uniform size and stabilized structure have been successfully fabricated by electrodepositing Ag nanowires, and subsequently Cu nanowires in track-etched polymer templates. The pore size of nanopores prepared by this template is uniform and continuously controlled, so aperture of achieved nanowires are uniform and can be regulated. This polymer template can dissolve inorganic solvents that do not react with the nanowires, making it is easy to release the nanowires into solution. The nanopore shape in the track-etched templates is adjustable (e.g. conical), nanowires with more special shapes could be fabricated. Thus, these features make this simple and inexpensive method very suitable for the preparation of Janus nanowire.

  11. Experimental study of the ternary Ag-Cu-In phase diagram

    Energy Technology Data Exchange (ETDEWEB)

    Bahari, Zahra [Laboratoire de chimie physique et minerale, Faculte des sciences pharmaceutiques et biologiques, Universite Paris Descartes, avenue de l' Observatoire, 75006 Paris (France); Laboratoire de chimie du solide mineral (LCSM), Faculte des sciences, Universite Mohamed 1er, Route Sidi Maafa, B.P. 524, Oujda, Maroc (Morocco); Elgadi, Mohamed [Laboratoire de chimie du solide mineral (LCSM), Faculte des sciences, Universite Mohamed 1er, Route Sidi Maafa, B.P. 524, Oujda, Maroc (Morocco); Rivet, Jacques [Laboratoire de chimie physique et minerale, Faculte des sciences pharmaceutiques et biologiques, Universite Paris Descartes, avenue de l' Observatoire, 75006 Paris (France); Dugue, Jerome [Laboratoire de chimie physique et minerale, Faculte des sciences pharmaceutiques et biologiques, Universite Paris Descartes, avenue de l' Observatoire, 75006 Paris (France)], E-mail: jerome.dugue@univ-paris5.fr

    2009-05-27

    The phase diagram of the Ag-Cu-In system was investigated using powder X-ray diffraction (XRD), differential scanning calorimetry (DSC) and electron probe microanalysis (EPMA). Two isothermal sections (at 510 and 607 deg. C) and 15 isopletic sections were studied. The results showed seven ternary peritectics, one ternary eutectic and one ternary metatectic. A complete reaction scheme was constructed, the valleys were drawn and the liquidus surfaces were derived from DSC data in the entire composition range.

  12. Brazing of SiC Ceramics Using Ag-Cu-In-Ti Filler Metal

    OpenAIRE

    LIU Yan,HUANG Zheng-Ren,LIU Xue-Jian,YUAN Ming

    2009-01-01

    Sintered silicon carbide was jointed with itself using Ag-Cu-In-Ti filler metal successfully. Interfacial microstructure was investigated by electron probe microanalysis (EPMA) and transmission electron microscope (TEM). Joining strength of SiC/SiC joints was measured by four-point flexural strength. The experimental results indicate that joining strength has a peak value with the joining temperature increasing, and the max flexural strength reaches 234MPa, however joining strength decreases ...

  13. Preparation of Ag/Cu Janus nanowires: Electrodeposition in track-etched polymer templates

    International Nuclear Information System (INIS)

    Highlights: • In this paper, we introduce a simple method for preparation of Janus nanowires by electrodeposition. • Using ion-track-etched PC polymer templates and commercial PC track-etched membrane templates, Ag/Cu Janus nanowires fabricated by this method all have uniform size. No matter how the holes array in the template, regular or not, the nanowires prepared by this method have similar properties. • By controlling the etching time, the size of the nanowires could be controlled easily and special shape nanowires also can be prepared by this template. • The polymer template is very easy to dissolve thoroughly and has no damage to nanowires almost. It is suitable for the preparation of nanowires suspension. • This method also has better applicability for polymer templates and can be seen as a simple convenient method for the preparation of Ag/Cu Janus nanowires. - Abstract: Bimetal (Janus) nanowire has been widely used as a promising nanoscale motor. In this paper we present a highly controllable method to fabricate Ag/Cu Janus nanowires using track-etched polymer templates. Ag/Cu Janus nanowires with uniform size and stabilized structure have been successfully fabricated by electrodepositing Ag nanowires, and subsequently Cu nanowires in track-etched polymer templates. The pore size of nanopores prepared by this template is uniform and continuously controlled, so aperture of achieved nanowires are uniform and can be regulated. This polymer template can dissolve inorganic solvents that do not react with the nanowires, making it is easy to release the nanowires into solution. The nanopore shape in the track-etched templates is adjustable (e.g. conical), nanowires with more special shapes could be fabricated. Thus, these features make this simple and inexpensive method very suitable for the preparation of Janus nanowire

  14. Effect of Synthesis Techniques on Crystallization and Optical Properties of Ag-Cu Bimetallic Nanoparticles

    Science.gov (United States)

    Xiong, Ziye; Qin, Fen; Huang, Po-Shun; Nettleship, Ian; Lee, Jung-Kun

    2016-04-01

    Silver (Ag)-copper (Cu) bimetallic nanoparticles (NPs) were synthesized by the reduction of silver nitrate and copper (II) acetate monohydrate using ethylene glycol in a microwave (MW) heating system with controlled reaction times ranging from 5 min to 30 min. The molar ratio Ag/Cu was varied from 1:1 to 1:3. The effect of reaction conditions on the bimetallic NPs structures and compositions were characterized by x-ray photoelectron spectroscopy, x-ray diffraction and transmission electron microscopy. The average particle size was approximately 150 nm. The surface plasmon resonance (SPR) of Ag-Cu bimetallic NPs was investigated by monitoring the SPR band peak behavior via UV/Vis spectrophotometry. The resonance peak positions and peak widths varied due to the different structures of the bimetallic NPs created under the synthesis conditions. In the MW heating method, the reduction of Cu was increased and Cu was inhomogeneously deposited over the Ag cores. As the composition of Cu becoming higher in the Ag-Cu bimetallic NPs, the absorption between 400 nm to 600 nm was greatly enhanced.

  15. Effect of rare earth Ce on the fatigue life of SnAgCu solder joints in WLCSP device using FEM and experiments

    International Nuclear Information System (INIS)

    With the addition of 0.03 wt% rare earth Ce, in our previous works, the properties of SnAgCu solder were enhanced obviously. Based on the Garofalo–Arrhenius creep constitutive model, finite element method was used to simulate the stress–strain response during thermal cycle loading, and combined with the fatigue life prediction models, the fatigue life of SnAgCu/SnAgCuCe solder joints was calculated respectively, which can demonstrate the effect of the rare earth Ce on the fatigue life of SnAgCu solder joints. The results indicated that the maximum stress–strain can be found on the top surface of the corner solder joint, and the warpage of the PCB substrate occurred during thermal cycle loading. The trends obtained from modeling results have a good agreement with the experimental data reported in the literature for WLCSP devices. In addition, the stress–strain of SnAgCuCe solder joints is lower than that of SnAgCu solder joints. The thermal fatigue lives of solder joints calculated based on the creep model and creep strain energy density model show that the fatigue life of SnAgCuCe solder joints is higher than the SnAgCu solder joints. The fatigue life of SnAgCuCe solder joints can be enhanced significantly with the addition of Ce, is 30.2% higher than that of SnAgCu solder joints, which can be attributed to the CeSn3 particles formed resisting the motion of dislocation; moreover, the refinement of microstructure and the IMC sizes also contribute to the enhancement of fatigue life, which elucidates that SnAgCuCe solder can be utilized in electronic industry with high reliability replacing the SnAgCu solder

  16. Room-temperature synthesis of (Ag,Cu)2S hollow spheres by cation exchange and their optical properties

    International Nuclear Information System (INIS)

    Research highlights: → Hollow (Ag,Cu)2S microspheres with diameter of 700 nm to 1 μm were prepared with CuS hollow spheres as templates at room temperature. → The shell was composed of nanoparticles. → The absorption of hollow (Ag,Cu)2S spheres was strong in ultraviolet and infrared region but weak in visible region. - Abstract: Hollow (Ag,Cu)2S microspheres were prepared with spherical aggregates of CuS nanoparticles as templates at room temperature. The products were characterized using transmission electron microscopy, scanning electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The result showed that when the molar ratio of CuS to Ag+ was 2:1, the obtained product was hollow microspheres with diameter of 700 nm to 1 μm. The shell of the hollow spheres was composed of (Ag,Cu)2S nanoparticles. The absorption of hollow (Ag,Cu)2S spheres was strong in ultraviolet and infrared region but weak in visible region. It will be valuable optical materials for selective absorption or transmission.

  17. Crystal orientation and morphology in Al-Ag-Cu ternary eutectic

    OpenAIRE

    Genau, Amber L; Ratke, Lorenz

    2011-01-01

    Ternary eutectics provide a unique opportunity for studying the e�ects of complex microstructure formation, as three distinct phases must be formed simultaneously from the melt. In order to produce fully coupled three-phase growth, Al-Ag-Cu at the ternary eutectic composition was directionally solidi�ed in a constant temperature gradient of 3 K/mm at velocities between 0.2 and 5.0 �m/sec. Under these conditions, the two intermetallic phases appear to grow as closely coupled rod...

  18. Efficient enhancement of hydrogen production by Ag/Cu2O/ZnO tandem triple-junction photoelectrochemical cell

    International Nuclear Information System (INIS)

    Highly efficient semiconductor photoelectrodes for solar hydrogen production through photocatalytic water splitting are a promising and challenge solution to solve the energy problems. In this work, Ag/Cu2O/ZnO tandem triple-junction photoelectrode was designed and prepared. An increase of 11 times of photocurrent is achieved in the Ag/Cu2O/ZnO photoelectrode comparing to that of the Cu2O film. The high performance of the Ag/Cu2O/ZnO film is due to the optimized design of the tandem triple-junction structure, where the localized surface Plasmon resonance of Ag and the hetero-junctions efficiently absorb solar energy, produce, and separate electron-hole pairs in the photocathode

  19. AgCuVO4 : A quasi-one-dimensional S=(1)/(2) chain compound

    Science.gov (United States)

    Möller, A.; Schmitt, M.; Schnelle, W.; Förster, T.; Rosner, H.

    2009-09-01

    We present a joint experimental and computational study of the recently synthesized spin 1/2 system silver-copper-orthovanadate AgCuVO4 [A. Möller and J. Jainski, Z. Anorg. Allg. Chem. 634, 1669 (2008)] exhibiting chains of trans corner-sharing [CuO4] plaquettes. The static magnetic susceptibility and specific heat measurements of AgCuVO4 can be described to a good approximation by the Bonner-Fisher spin-chain model with Jintra≈330K . Evidence for a Néel-type of order at ˜2.5K is obtained from the specific heat and corroborated by ESR studies. To independently obtain a microscopically based magnetic model, density functional electronic structure calculations were performed. In good agreement with the experimental data, we find pronounced one-dimensional magnetic exchange along the corner-sharing chains with small interchain couplings. The difference between the experimentally observed and the calculated ordering temperature can be assigned to a sizable interchain frustration derived from the calculations.

  20. Mechanistic Prediction of the Effect of Microstructural Coarsening on Creep Response of SnAgCu Solder Joints

    Science.gov (United States)

    Mukherjee, S.; Chauhan, P.; Osterman, M.; Dasgupta, A.; Pecht, M.

    2016-04-01

    Mechanistic microstructural models have been developed to capture the effect of isothermal aging on time dependent viscoplastic response of Sn3.0Ag0.5Cu (SAC305) solders. SnAgCu (SAC) solders undergo continuous microstructural coarsening during both storage and service because of their high homologous temperature. The microstructures of these low melting point alloys continuously evolve during service. This results in evolution of creep properties of the joint over time, thereby influencing the long term reliability of microelectronic packages. It is well documented that isothermal aging degrades the creep resistance of SAC solder. SAC305 alloy is aged for (24-1000) h at (25-100)°C (~0.6-0.8 × T melt). Cross-sectioning and image processing techniques were used to periodically quantify the effect of isothermal aging on phase coarsening and evolution. The parameters monitored during isothermal aging include size, area fraction, and inter-particle spacing of nanoscale Ag3Sn intermetallic compounds (IMCs) and the volume fraction of micronscale Cu6Sn5 IMCs, as well as the area fraction of pure tin dendrites. Effects of microstructural evolution on secondary creep constitutive response of SAC305 solder joints were then modeled using a mechanistic multiscale creep model. The mechanistic phenomena modeled include: (1) dispersion strengthening by coarsened nanoscale Ag3Sn IMCs in the eutectic phase; and (2) load sharing between pro-eutectic Sn dendrites and the surrounding coarsened eutectic Sn-Ag phase and microscale Cu6Sn5 IMCs. The coarse-grained polycrystalline Sn microstructure in SAC305 solder was not captured in the above model because isothermal aging does not cause any significant change in the initial grain size and orientation of SAC305 solder joints. The above mechanistic model can successfully capture the drop in creep resistance due to the influence of isothermal aging on SAC305 single crystals. Contribution of grain boundary sliding to the creep strain of

  1. Atomic Mobilities in the Ag-Cu-Sn Face-Centered Cubic Lattice

    Science.gov (United States)

    Gierlotka, W.; Chen, Y. H.; Haque, M. A.; Rahman, M. A.

    2012-12-01

    Knowledge of atomic mobilities is necessary to predict the evolution of microstructure. The theoretical description of atomic mobilities is connected to the chemical potentials of the components in a given phase. A new thermodynamic description of the quaternary Ag-Cu-In-Sn system was recently published, and it is clear that a new description of the mobilities is also necessary. Based on the available literature and using Dictra software, optimization of the mobility parameters of silver, copper, and tin in the face-centered cubic phase was carried out. The results were compared with relevant data from literature as well as with our own experimental results. Good agreement between calculations and experiment was obtained.

  2. Kinetic trapping through coalescence and the formation of patterned Ag-Cu nanoparticles

    Science.gov (United States)

    Grammatikopoulos, Panagiotis; Kioseoglou, Joseph; Galea, Antony; Vernieres, Jerome; Benelmekki, Maria; Diaz, Rosa E.; Sowwan, Mukhles

    2016-05-01

    In recent years, due to its inherent flexibility, magnetron-sputtering has been widely used to synthesise bi-metallic nanoparticles (NPs) via subsequent inert-gas cooling and gas-phase condensation of the sputtered atomic vapour. Utilising two separate sputter targets allows for good control over composition. Simultaneously, it involves fast kinetics and non-equilibrium processes, which can trap the nascent NPs into metastable configurations. In this study, we observed such configurations in immiscible, bi-metallic Ag-Cu NPs by scanning transmission electron microscopy (S/TEM) and electron energy-loss spectroscopy (EELS), and noticed a marked difference in the shape of NPs belonging to Ag- and Cu-rich samples. We explained the formation of Janus or Ag@Cu core/shell metastable structures on the grounds of in-flight mixed NP coalescence. We utilised molecular dynamics (MD) and Monte Carlo (MC) computer simulations to demonstrate that such configurations cannot occur as a result of nanoalloy segregation. Instead, sintering at relatively low temperatures can give rise to metastable structures, which eventually can be stabilised by subsequent quenching. Furthermore, we compared the heteroepitaxial diffusivities along various surfaces of both Ag and Cu NPs, and emphasised the differences between the sintering mechanisms of Ag- and Cu-rich NP compositions: small Cu NPs deform as coherent objects on large Ag NPs, whereas small Ag NPs dissolve into large Cu NPs, with their atoms diffusing along specific directions. Taking advantage of this observation, we propose controlled NP coalescence as a method to engineer mixed NPs of a unique, patterned core@partial-shell structure, which we refer to as a ``glass-float'' (ukidama) structure.In recent years, due to its inherent flexibility, magnetron-sputtering has been widely used to synthesise bi-metallic nanoparticles (NPs) via subsequent inert-gas cooling and gas-phase condensation of the sputtered atomic vapour. Utilising two

  3. Kinetic trapping through coalescence and the formation of patterned Ag-Cu nanoparticles.

    Science.gov (United States)

    Grammatikopoulos, Panagiotis; Kioseoglou, Joseph; Galea, Antony; Vernieres, Jerome; Benelmekki, Maria; Diaz, Rosa E; Sowwan, Mukhles

    2016-05-14

    In recent years, due to its inherent flexibility, magnetron-sputtering has been widely used to synthesise bi-metallic nanoparticles (NPs) via subsequent inert-gas cooling and gas-phase condensation of the sputtered atomic vapour. Utilising two separate sputter targets allows for good control over composition. Simultaneously, it involves fast kinetics and non-equilibrium processes, which can trap the nascent NPs into metastable configurations. In this study, we observed such configurations in immiscible, bi-metallic Ag-Cu NPs by scanning transmission electron microscopy (S/TEM) and electron energy-loss spectroscopy (EELS), and noticed a marked difference in the shape of NPs belonging to Ag- and Cu-rich samples. We explained the formation of Janus or Ag@Cu core/shell metastable structures on the grounds of in-flight mixed NP coalescence. We utilised molecular dynamics (MD) and Monte Carlo (MC) computer simulations to demonstrate that such configurations cannot occur as a result of nanoalloy segregation. Instead, sintering at relatively low temperatures can give rise to metastable structures, which eventually can be stabilised by subsequent quenching. Furthermore, we compared the heteroepitaxial diffusivities along various surfaces of both Ag and Cu NPs, and emphasised the differences between the sintering mechanisms of Ag- and Cu-rich NP compositions: small Cu NPs deform as coherent objects on large Ag NPs, whereas small Ag NPs dissolve into large Cu NPs, with their atoms diffusing along specific directions. Taking advantage of this observation, we propose controlled NP coalescence as a method to engineer mixed NPs of a unique, patterned core@partial-shell structure, which we refer to as a "glass-float" (ukidama) structure. PMID:27119383

  4. The role of Ag in (Ag,Cu)2ZnSnS4 thin film for solar cell application

    International Nuclear Information System (INIS)

    Highlights: • (Ag,Cu)2ZnSnS4 thin film was synthesized through metallic stacking layers. • Ag incorporation reduces the size and amount of voids at back contact. • Less planar defects and Cu vacancy are formed in the (Ag,Cu)2ZnSnS4. • Solar cell performance was improved with Ag incorporation. - Abstract: Recently, Ag incorporation into Cu(In,Ga)Se2 structure was found to benefit the solar cell performance. However, (Ag,Cu)2ZnSnS4 used as the solar cell absorber is not widely reported even though Ag2ZnSnS4 has shown much better photocatalysts activity for H2 evolution than Cu2ZnSnS4. In this paper, (Ag,Cu)2ZnSnS4 thin film solar cell was synthesized through sulfurization of Ag/Zn/Cu/Sn metallic stacked layers. In order to understand the actual role of Ag in the Cu2ZnSnS4 structure, the changing chemical environment, microstructure and intragrain defect due to the Ag incorporation, were studied by X-ray photoelectron spectroscopy and transmission electron microscopy. After sulfurization, Ag is uniformly distributed in the absorber and is incorporated into Cu2ZnSnS4 crystal structure but no obvious change of the Cu2ZnSnS4 chemical environment is detected. A large density of voids is formed at the Cu2ZnSnS4/Mo interface and some of these voids are found to be coated with CdS which is believed to be detrimental to Cu2ZnSnS4 device performance. In contrast, Ag incorporation reduces the size and amount of voids and thus effectively eliminates CdS deposited at back contact region. Moreover, fewer planar defects and Cu vacancies are formed in the (Ag,Cu)2ZnSnS4 sample than Cu2ZnSnS4 sample as suggested by electron diffraction patterns. Therefore, improved solar cell performance should result from the formation of (Ag,Cu)2ZnSnS4 structure

  5. ANTIMICROBIAL ACTIVITY OF Ag+, Cu2+, Zn2+, Mg2+ IONS DOPED CHITOSAN NANOPARTICLES

    Directory of Open Access Journals (Sweden)

    Sukhodub LB

    2015-04-01

    Full Text Available Modification by polymers and inorganic ions of the bioactive materials for orthopedic implants with the purpose of initiating controlled reactions in tissues that surround the implant, is one of the modern approaches in medical materials. A key feature of functional polymers is their ability to form complexes with various metal ions in solution. Chitosan is natural biopolymer with pronounced affinity to transition metal ions. Some researches prove the higher antimicrobial activity of Chitosan-metal complexes compared with pure Chitosan. The purpose of this work was the study of antimicrobial activity of Chitosan nanoparticles modified by metal ions Ag+, Cu2+, Zn2+, Mg2+ against reference strains S. aureus 25923 ATSS, E. coli ATCC 25922, C. albicans ATCC 885653 for their further use as components of the composite biomaterials for medical purpose.Chitosan nanoparticles suspension was prepared by known method based on the ionotropic gelation between chitosan and sodium tripolyphosphate.To obtain Chitosan-metal nanoparticles to the Chitosan suspension were added the corresponding metal ions aqueous solutions in quantity to match the concentration of metal ions of 200 ppm . Antibacterial activities of Ag+, Cu2+, Zn2+, Mg2+ ions doped Chitosan nanoparticles, pure Chitosan nanoparticles, metal ions and 1% (v/v acetic acid solution (it was used as solvent for Chitosan against bacteria were evaluated by determination of minimum inhibitory concentration (MIC and minimum bactericidal concentration (MBC in vitro. Muller– Hinton (MH broth and MH agar (Russia were used as growth media. The bacteria suspension for further use was prepared with concentration that corresponded 0,5units by McFarland scale. The MIC was determined by a broth dilution method. The results were read after 24 hours of experimental tubes incubation at 37 oC as equivalent to the concentration of the tube without visible growth. To evaluate MBC, a sample of 0,1 ml was transferred from

  6. Synthesis and characterization of Ag@Cu nano/microstructure ordered arrays as SERS-active substrates

    Science.gov (United States)

    Zhang, Pinhua; Cui, Guangliang; Xiao, Chuanhai; Zhang, Mingzhe; Chen, Li; Shi, Changmin

    2016-06-01

    We fabricated an Ag decorated Cu (Ag@Cu) nano/microstructure ordered array by facile template-free 2D electrodeposition combined with a galvanic reduction method for SERS applications. The Cu nano/microstructure ordered arrays were first synthesized by a 2D electrodeposition method, then Ag nanocubes were decorated on the arrays by galvanic reduction without any capping agent. The pollution-free surface and edge-to-face heterostructure of Ag nanocubes and Cu nano/microstructure arrays provide the powerful field-enhancements for SERS performance. The results verified that the Ag@Cu nano/microstructure ordered arrays have excellent activity for 4-Mercaptopyridine, and the sensitivity limit is as low as 10‑8 M. Therefore, this facile route provides a useful platform for the fabrication of a SERS substrate based on nano/microstructure ordered arrays.

  7. The study on interfacial bonding strength of Ag-Ni, Ag-Cu in cold pressure welding

    Institute of Scientific and Technical Information of China (English)

    李云涛; 杜则裕; 陈丽萍

    2003-01-01

    The area of combination actually is a kind of interfacial phenomena that exist on the surface or thin film. The properties of interface have important effect on the whole welded joint, even decide directly the interfacial bonding strength. The bonding strength of metals in cold pressure welding such as Ag-Ni (they are hardly mutual soluble) and Ag-Cu(they are limited soluble) are discussed in this paper. The results of the tensile test suggest that two kinds of welded joints have enough strength to satisfy with the demand for being used. Moreover, thermodynamics, crystal logy, physics and metal electronic microscopic analysis etc are adopted to further calculate the bonding strength. The results of test and theoretical analyses prove that Ag-Ni, Ag-Cu, especially, for Ag-Ni can form strong welded joint which is higher than that of the relative soft base metals in cold pressure welding.

  8. Mechanical Properties and Electrochemical Corrosion Behavior of Al/Sn-9Zn- xAg/Cu Joints

    Science.gov (United States)

    Huang, M. L.; Huang, Y. Z.; Ma, H. T.; Zhao, J.

    2011-03-01

    The effect of Ag content on the wetting behavior of Sn-9Zn- xAg on aluminum and copper substrates during soldering, as well as the mechanical properties and electrochemical corrosion behavior of Al/Sn-9Zn- xAg/Cu solder joints, were investigated in the present work. Tiny Zn and coarsened dendritic AgZn3 regions were distributed in the Sn matrix in the bulk Sn-9Zn- xAg solders, and the amount of Zn decreased while that of AgZn3 increased with increasing Ag content. The wettability of Sn-9Zn-1.5Ag solder on Cu substrate was better than those of the other Sn-9Zn- xAg solders but worse than that of Sn-9Zn solder. The wettability of Sn-9Zn-1.5Ag on the Al substrate was also better than those of the other Sn-9Zn- xAg solders, and even better than that of Sn-9Zn solder. The Al/Sn-9Zn/Cu joint had the highest shear strength, and the shear strength of the Al/Sn-9Zn- xAg/Cu ( x = 0 wt.% to 3 wt.%) joints gradually decreased with increasing Ag content. The corrosion resistance of the Sn-9Zn- xAg solders in Al/Sn-9Zn- xAg/Cu joints in 5% NaCl solution was improved compared with that of Sn-9Zn. The corrosion potential of Sn-9Zn- xAg solders continuously increased with increasing Ag content from 0 wt.% to 2 wt.% but then decreased for Sn-9Zn-3Ag. The addition of Ag resulted in the formation of the AgZn3 phase and in a reduction of the amount of the eutectic Zn phase in the solder matrix; therefore, the corrosion resistance of the Al/Sn-9Zn- xAg/Cu joints was improved.

  9. Magnetic microstructures from magnetic force microscopy and Monte Carlo simulation in CoFe-Ag-Cu granular films

    OpenAIRE

    Batlle Gelabert, Xavier; Valencia, A.; Labarta, Amílcar; O'Grady, K; Watson, M L

    1998-01-01

    CoFe-Ag-Cu granular films, prepared by rf sputtering, displayed magnetic domain microstructures for ferromagnetic concentrations above about 32% at, and below the percolation threshold. All samples have a fcc structure with an (111) texture perpendicular to the film plane. Magnetic force microscopy (MFM) showed a variety of magnetic domain microstructures, extremely sensitive to the magnetic history of the sample, which arise from the balance of the ferromagnetic exchange, the dipolar interac...

  10. Influence of High- G Mechanical Shock and Thermal Cycling on Localized Recrystallization in Sn-Ag-Cu Solder Interconnects

    Science.gov (United States)

    Lee, Tae-Kyu; Kim, Choong-Un; Bieler, Thomas R.

    2014-01-01

    The impact of isothermal aging and recrystallized grain structure distribution on mechanical shock and thermal cycling performance of solder joints with 1% and 3% silver content Sn-Ag-Cu interconnects were investigated. Localized recrystallized grain structure distributions were analyzed to identify correlations between the microstructure evolution and shock performance. The results reveal that the shock tolerance depends on the amount of shock energy that can be absorbed during each shock cycle, which depends on microstructural features. Based on the recrystallized grain distribution, additional isothermal aging in 1% silver Sn-Ag-Cu interconnects shows improved shock performance, whereas degraded shock performance was observed in 3% Sn-Ag-Cu interconnects. Using the same grain boundary distribution analysis on thermally cycled samples, relationships between the particle size distribution, localized recrystallized grain structure development, shock, and thermomechanical performance were identified: finer particle spacing is beneficial for thermal cycling as it resists grain boundary generation, while conversely, wider particle spacing facilitates recrystallization and grain boundary mobility that allows Sn to absorb shock energy.

  11. One-Step Solvothermal Method to Prepare Ag/Cu2O Composite With Enhanced Photocatalytic Properties

    Science.gov (United States)

    Deng, Xiaolong; Wang, Chenggang; Zhou, E.; Huang, Jinzhao; Shao, Minghui; Wei, Xianqi; Liu, Xiaojing; Ding, Meng; Xu, Xijin

    2016-01-01

    Ag/Cu2O microstructures with diverse morphologies have been successfully synthesized with different initial reagents of silver nitrate (AgNO3) by a facile one-step solvothermal method. Their structural and morphological characteristics were carefully investigated by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM), and the experimental results showed that the morphologies transformed from microcubes for pure Cu2O to microspheres with rough surfaces for Ag/Cu2O. The photocatalytic activities were evaluated by measuring the degradation of methyl orange (MO) aqueous solution under visible light irradiation. The photocatalytic efficiencies of MO firstly increased to a maximum and then decreased with the increased amount of AgNO3. The experimental results revealed that the photocatalytic activities were significantly influenced by the amount of AgNO3 during the preparation process. The possible reasons for the enhanced photocatalytic activities of the as-prepared Ag/Cu2O composites were discussed.

  12. One-Step Solvothermal Method to Prepare Ag/Cu2O Composite With Enhanced Photocatalytic Properties.

    Science.gov (United States)

    Deng, Xiaolong; Wang, Chenggang; Zhou, E; Huang, Jinzhao; Shao, Minghui; Wei, Xianqi; Liu, Xiaojing; Ding, Meng; Xu, Xijin

    2016-12-01

    Ag/Cu2O microstructures with diverse morphologies have been successfully synthesized with different initial reagents of silver nitrate (AgNO3) by a facile one-step solvothermal method. Their structural and morphological characteristics were carefully investigated by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM), and the experimental results showed that the morphologies transformed from microcubes for pure Cu2O to microspheres with rough surfaces for Ag/Cu2O. The photocatalytic activities were evaluated by measuring the degradation of methyl orange (MO) aqueous solution under visible light irradiation. The photocatalytic efficiencies of MO firstly increased to a maximum and then decreased with the increased amount of AgNO3. The experimental results revealed that the photocatalytic activities were significantly influenced by the amount of AgNO3 during the preparation process. The possible reasons for the enhanced photocatalytic activities of the as-prepared Ag/Cu2O composites were discussed. PMID:26781287

  13. Comparative Study of ENIG and ENEPIG as Surface Finishes for a Sn-Ag-Cu Solder Joint

    Science.gov (United States)

    Yoon, Jeong-Won; Noh, Bo-In; Jung, Seung-Boo

    2011-09-01

    Interfacial reactions and joint reliability of Sn-3.0Ag-0.5Cu solder with two different surface finishes, electroless nickel-immersion gold (ENIG) and electroless nickel-electroless palladium-immersion gold (ENEPIG), were evaluated during a reflow process. We first compared the interfacial reactions of the two solder joints and also successfully revealed a connection between the interfacial reaction behavior and mechanical reliability. The Sn-Ag-Cu/ENIG joint exhibited a higher intermetallic compound (IMC) growth rate and a higher consumption rate of the Ni(P) layer than the Sn-Ag-Cu/ENEPIG joint. The presence of the Pd layer in the ENEPIG suppressed the growth of the interfacial IMC layer and the consumption of the Ni(P) layer, resulting in the superior interfacial stability of the solder joint. The shear test results show that the ENIG joint fractured along the interface, exhibiting indications of brittle failure possibly due to the brittle IMC layer. In contrast, the failure of the ENEPIG joint only went through the bulk solder, supporting the idea that the interface is mechanically reliable. The results from this study confirm that the Sn-Ag-Cu/ENEPIG solder joint is mechanically robust and, thus, the combination is a viable option for a Pb-free package system.

  14. Rheological characterisation and printing performance of Sn/Ag/Cu solder pastes

    International Nuclear Information System (INIS)

    Lead-free solder paste printing process accounts for majority of the assembly defects in the electronic manufacturing industry. The study investigates rheological behaviour and stencil printing performance of the lead-free solder pastes (Sn/Ag/Cu). Oscillatory stress sweep test was carried out to study the visco-elastic behaviour of the lead-free solder pastes. The visco-elastic behaviour of the paste encompasses solid and liquid characteristic of the paste, which could be used to study the flow behaviour experienced by the pastes during the stencil printing process. From this study, it was found that the solid characteristics (G') is higher than the liquid characteristic (G'') for the pastes material. In addition, the results from the study showed that the solder paste with a large G' = G'' has a higher cohesiveness resulting in poor withdrawal of the paste during the stencil printing process. The phase angles (δ) was used to correlate the quality of the dense suspensions to the formulation of solder paste materials. This study has revealed the value of having a rheological measurement for explaining and characterising solder pastes for stencil printing. As the demand for lead free pastes increases rheological measurements can assist with the formulation or development of new pastes.

  15. Electronic structure and conductivity of nanocomposite metal (Au,Ag,Cu,Mo)-containing amorphous carbon films

    Energy Technology Data Exchange (ETDEWEB)

    Endrino, Jose L.; Horwat, David; Gago, Raul; Andersson, Joakim; Liu, Y.S.; Guo, Jinghua; Anders, Andre

    2008-05-14

    In this work, we study the influence of the incorporation of different metals (Me = Au, Ag, Cu, Mo) on the electronic structure of amorphous carbon (a-C:Me) films. The films were produced at room temperature using a novel pulsed dual-cathode arc deposition technique. Compositional analysis was performed with secondary neutral mass spectroscopy whereas X-ray diffraction was used to identify the formation of metal nanoclusters in the carbon matrix. The metal content incorporated in the nanocomposite films induces a drastic increase in the conductivity, in parallel with a decrease in the band gap corrected from Urbach energy. The electronic structure as a function of the Me content has been monitored by x-ray absorption near edge structure (XANES) at the C K-edge. XANES showed that the C host matrix has a dominant graphitic character and that it is not affected significantly by the incorporation of metal impurities, except for the case of Mo, where the modifications in the lineshape spectra indicated the formation of a carbide phase. Subtle modifications of the spectral lineshape are discussed in terms of nanocomposite formation.

  16. Electrical Properties of Al, Ag, Cu, Ti and SS Thin Film for Electrode of Solar Cell

    International Nuclear Information System (INIS)

    The Al, Ag, Cu, Ti and SS materials were deposited on the surface of glass substrate using plasma DC sputtering technique. The deposition process was done with the following plasma parameters : deposition time, gas pressure and substrate temperature with the aim to obtain a good conductance of thin films. Variation of substrate deposition time was 1 - 15 minutes, gas pressure was 5x10-2 - 7x10-2 torr and of temperature was 100 - 300 oC. The resistance measurement has been done by four points probes and the conductivity was calculated using mathematic formulation. It was obtained that the minimum resistance in the order of R = 0.07 Ω, was found at Ag materials and this was obtained at the following plasma parameters : deposition time 15 minutes, gas pressure 6x10-2 torr and temperature 300 oC, while, the resistance of : Cu, Al, Ti and SS materials were R = 0.13 Ω, R = 450 Ω, R = 633 Ω, R = 911 Ω respectively, It could be concluded that the Ag thin film has a minimum resistance, high conductivity compared to the other materials Al, Cu, Ti and SS. Ag is therefore the suitable material for applying as electrode of solar cell. (author)

  17. Thermal analysis of selected tin-based lead-free solder alloys

    DEFF Research Database (Denmark)

    Palcut, Marián; Sopoušek, J.; Trnková, L.; Hodúlová, E.; Szewczyková, B.; Ožvold, M.; Turňa, M.; Janovec, J.

    2009-01-01

    The Sn-Ag-Cu alloys have favourable solderability and wetting properties and are, therefore, being considered as potential lead-free solder materials. In the present study, tin-based Sn-Ag-Cu and Sn-Ag-Cu-Bi alloys were studied in detail by a differential scanning calorimetry (DSC) and...... thermodynamic calculations using the CALPHAD approach. The amount of the alloying elements in the materials was chosen to be close to the respective eutectic composition and the nominal compositions were the following: Sn-3.7Ag-0.7Cu, Sn-1.0Ag-0.5Cu-1Bi (in wt.%). Thermal effects during melting and solidifying...... simulated using the Thermo-Calc software package. This approach enabled us to obtain the enthalpy of cooling for each alloy and to compare its temperature derivative with the experimental DSC curves....

  18. Structures and segregation patterns of Ag-Cu and Ag-Ni nanoalloys adsorbed on MgO(0 0 1).

    Science.gov (United States)

    Bochicchio, Davide; Ferrando, Riccardo; Panizon, Emanuele; Rossi, Giulia

    2016-02-17

    Low-energy geometric structures and segregation patterns of Ag-Cu and Ag-Ni nanoparticles adsorbed on MgO(0 0 1) are searched for by global optimisation methods within an atomistic potential model. Sizes betwen 100 and 300 atoms are considered for several compositions. In all cases, Ag segregates to the nanoparticle surface, so that Cu@Ag and Ni@Ag core-shell arrangements are found, with off-centre cores for Ag-rich compositions. The behaviours of Ag-Cu and Ag-Ni differ at the interface with the MgO substrate. For Ag-Cu, some Cu atoms are at the interface even for compositions that are very rich in Ag, where Ag-Ni nanoparticles present an interface completely made of Ag atoms. Ag-Ni and Ag-Cu also differ concerning their geometric structures. With increasing Ag content, in Ag-Cu we find the structural sequence faulted fcc [Formula: see text] icosahedral [Formula: see text] fcc, while in Ag-Ni we find the sequence hcp [Formula: see text] faulted fcc-faulted hcp [Formula: see text] icosahedral [Formula: see text] fcc. PMID:26795034

  19. Electrical resistivity of liquid noble metal alloys

    International Nuclear Information System (INIS)

    Calculations of the dependence of the electrical resistivity in liquid Ag-Au, Cu-Ag, Cu-Au binary alloys on composition are reported. The structure of the binary alloy is described as a hard sphere system. A one-parameter local pseudopotential, which incorporates s-d hybridization effects phenomenologically, is employed in the resistivity calculation. A reasonable agreement with experimental trends is observed in cases where experimental information is available. (author)

  20. Growth behavior of intermetallic compounds at Sn–Ag/Cu joint interfaces revealed by 3D imaging

    Energy Technology Data Exchange (ETDEWEB)

    Zhang, Q.K., E-mail: qkzhang@alum.imr.ac.cn [Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016 (China); State Key Laboratory of Advanced Brazing Filler Metals & Technology, Zhengzhou Research Institute of Mechanical Engineering, Zhengzhou 450001 (China); Long, W.M. [State Key Laboratory of Advanced Brazing Filler Metals & Technology, Zhengzhou Research Institute of Mechanical Engineering, Zhengzhou 450001 (China); Zhang, Z.F., E-mail: zhfzhang@imr.ac.cn [Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016 (China)

    2015-10-15

    In this study, the morphologies of intermetallic compounds (IMCs) at the as-soldered and thermal aged Sn–Ag/Cu joint interfaces were observed by SEM and measured using Laser Confocal Microscope, and their three-dimensional (3D) shapes were revealed using 3D imaging technology. The observation reveal that during the soldering process the Cu{sub 6}Sn{sub 5} grains at the joint interface evolve from hemispheroid to a bamboo shoot-shaped body with increasing liquid state reacting time, and their grain size increases sharply. After thermal aging, the Cu{sub 6}Sn{sub 5} grains change into equiaxed grains, while the top of some prominent Cu{sub 6}Sn{sub 5} grains changes little. Due to the higher active energy of the Sn atoms at the grain boundary, the growth rate of IMC grains around the grain boundaries of the solder is higher during the aging process. From the evolution in morphology of the IMC layer, it is demonstrated that the IMC layer grows through grain boundary diffusion of the Cu and Sn atoms during the aging process, and the volume diffusion is very little. The 3D imaging technology is used to reveal the shape and dimension of the IMC grains. - Highlights: • Morphologies of IMCs at the Sn–Ag/Cu interface were revealed by 3D imaging. • Preferential growth of IMCs around the solder grain boundaries was observed. • Growth behaviors of IMCs during reflowing and aging process were investigated.

  1. Growth behavior of intermetallic compounds at Sn–Ag/Cu joint interfaces revealed by 3D imaging

    International Nuclear Information System (INIS)

    In this study, the morphologies of intermetallic compounds (IMCs) at the as-soldered and thermal aged Sn–Ag/Cu joint interfaces were observed by SEM and measured using Laser Confocal Microscope, and their three-dimensional (3D) shapes were revealed using 3D imaging technology. The observation reveal that during the soldering process the Cu6Sn5 grains at the joint interface evolve from hemispheroid to a bamboo shoot-shaped body with increasing liquid state reacting time, and their grain size increases sharply. After thermal aging, the Cu6Sn5 grains change into equiaxed grains, while the top of some prominent Cu6Sn5 grains changes little. Due to the higher active energy of the Sn atoms at the grain boundary, the growth rate of IMC grains around the grain boundaries of the solder is higher during the aging process. From the evolution in morphology of the IMC layer, it is demonstrated that the IMC layer grows through grain boundary diffusion of the Cu and Sn atoms during the aging process, and the volume diffusion is very little. The 3D imaging technology is used to reveal the shape and dimension of the IMC grains. - Highlights: • Morphologies of IMCs at the Sn–Ag/Cu interface were revealed by 3D imaging. • Preferential growth of IMCs around the solder grain boundaries was observed. • Growth behaviors of IMCs during reflowing and aging process were investigated

  2. A bamboo-inspired hierarchical nanoarchitecture of Ag/CuO/TiO2 nanotube array for highly photocatalytic degradation of 2,4-dinitrophenol.

    Science.gov (United States)

    Zhang, Xuhong; Wang, Longlu; Liu, Chengbin; Ding, Yangbin; Zhang, Shuqu; Zeng, Yunxiong; Liu, Yutang; Luo, Shenglian

    2016-08-01

    The optimized geometrical configuration of muitiple active materials into hierarchical nanoarchitecture is essential for the creation of photocatalytic degradation system that can mimic natural photosynthesis. A bamboo-like architecture, CuO nanosheets and Ag nanoparticles co-decorated TiO2 nanotube arrays (Ag/CuO/TiO2), was fabricated by using simple solution-immersion and electrodeposition process. Under simulated solar light irradiation, the 2,4-dinitrophenol (2,4-DNP) photocatalytic degradation rate over Ag/CuO/TiO2 was about 2.0, 1.5 and 1.2 times that over TiO2 nanotubes, CuO/TiO2 and Ag/TiO2, respectively. The enhanced photocatalytic activity of ternary Ag/CuO/TiO2 photocatalyst was ascribed to improved light absorption, reduced carrier recombination and more exposed active sites. Moreover, the excellent stability and reliability of the Ag/CuO/TiO2 photocatalyst demonstrated a promising application for organic pollutant removal from water. PMID:27107324

  3. Microstructure evolution and mechanical properties of vacuum-brazed C/C composite with AgCuTi foil

    International Nuclear Information System (INIS)

    The microstructure and bonding strength of vacuum-brazed C/C composite and C/C composite with AgCuTi foil are studied. The interface structure of the brazed joint is C/C composite–TiC–eutectic structure of AgCu–TiC–C/C composite. The maximum shear strength of the joint is about 20 MPa and TiC formed at the edge of C/C composite plays a key role in the brazing process. It improves the wettability of the C/C composite and inhibits diffusion of the Ag and Cu atoms in the filler metal and C atoms in the C/C composite. The fracture mode of the brazing joint is brittle. The interface evolution in the brazing process and associated mechanism are discussed

  4. Toward a mechanistic understanding of the damage evolution of SnAgCu solder joints in accelerated thermal cycling test

    Science.gov (United States)

    Mahin Shirazi, Sam

    Accelerated thermal cycling (ATC) tests are the most commonly used tests for the thermo-mechanical performance assessment of microelectronics assemblies. Currently used reliability models have failed to incorporate the microstructural dependency of lead free solder joint behavior and its microstructure evolution during cycling. Thus, it is essential to have a mechanistic understanding of the effect of cycling parameters on damage evolution and failure of lead free solder joints in ATC. Recrystallization has been identified as the damage rate controlling mechanism in ATC. Usually it takes 1/3 of life for completion of recrystallization regardless of cycling parameters. Thus, the life of the solder joints can be predicted by estimating global recrystallization. The objective of the first part of the study was to examine whether the damage scenario applies in service is the same as the harsh thermal cycling tests (i.e. 0/100 °C and -40/125 °C) commonly used in industry. Microstructure analysis results on a variety of lead free solder SnAgCu assemblies subjected to the both harsh (0/100 °C) and mild (20/80 °C) ATC confirmed similar failure mechanism under the both testing conditions. Sn grain morphology (interlaced versus beach ball) has a significant effect on the thermo-mechanical performance (and thus the model) of the lead free solder joints. The longer thermal cycling lifetime observed in the interlaced solder joints subjected to the ATC compared to the beach ball structure was correlated to the different initial microstructure and the microstructure evolution during cycling. For the modeling proposes, the present study was focused on Sn-Ag-Cu solder joints with either a single Sn grain or beach ball structure. Microstructural analysis results of the simulated thermal cycling experiment revealed that, the life can be approximated as determined by the accumulation of a certain amount of work during the high temperature dwells. Finally the effect of precipitates

  5. Electronic structure and x-ray magnetic circular dichroism in YbAgCu4 and YbInCu4

    Energy Technology Data Exchange (ETDEWEB)

    Antonov, VN; Bekenov, LV; Antropov, VP

    2014-04-08

    X-ray absorption and magnetic circular dichroism spectra at the L-3 edge of Yb have been studied theoretically in the mixed-valent compounds YbAgCu4 and YbInCu4 using the fully relativistic Dirac linear muffin-tin orbital band structure method. The effect of the spin-orbit (SO) interaction and Coulomb repulsion U on the electronic structure of YbAgCu4 and YbInCu4 is examined in the frame of the local spin-density approximation (LSDA)+SO+U method. The core-hole effect in the final states as well as the effect of the electric quadrupole E-2 and magnetic dipole M-1 transitions have been investigated. The calculated results are compared with available experimental data.

  6. Electronic structure and x-ray magnetic circular dichroism in YbAgCu4 and YbInCu4

    Energy Technology Data Exchange (ETDEWEB)

    Antonov, V N; Bekenov, L V; Antropov, V P

    2014-04-01

    X-ray absorption and magnetic circular dichroism spectra at the L3 edge of Yb have been studied theoretically in the mixed-valent compounds YbAgCu4 and YbInCu4 using the fully relativistic Dirac linear muffin-tin orbital band structure method. The effect of the spin-orbit (SO) interaction and Coulomb repulsion U on the electronic structure of YbAgCu4 and YbInCu4 is examined in the frame of the local spin-density approximation (LSDA)+SO+U method. The core-hole effect in the final states as well as the effect of the electric quadrupole E2 and magnetic dipole M1 transitions have been investigated. The calculated results are compared with available experimental data.

  7. Effect of additives on the co-electrodeposition of Sn-Ag-Cu lead-free solder composition

    International Nuclear Information System (INIS)

    We have developed a methane sulfonic acid (MSA) based ternary electrodeposition bath for the deposition of near eutectic Sn-Ag-Cu films aimed at solder bumping applications in electronics. The bath contains thiourea as chelating agent and iso-octyl phenoxy ethanol (OPPE) as surfactant. We added gelatin to this bath and studied its effect on bath stability, microstructure of the deposited films and the film composition. It is found that the bath containing both the additives, viz. OPPE and gelatin, show improved stability up to 8-10 days. Striking improvement in the film microstructure, in terms of the compactness, uniformity and refinement of grains was found when the bath contained these additives. Detailed electrochemical studies with the help of cyclic voltametry and impedance analysis helped in understanding the role played by these additives during deposition. It is confirmed that there is a formation of loosely connected, highly non-uniform passivating film on the cathode surface, which is removed competitively by the depositing metal ions during the deposition. It is also clear that the additives play a role in the formation of such a passivating film.

  8. Metal-gas reactions in arc plasma spraying of Ag, Cu, Ni, Ti, TiC, W, Zn, and Zr

    International Nuclear Information System (INIS)

    Powders of Ag, Cu, Ni, Ti, TiC, W, Zn, and Zr were arc sprayed with the plasma gas mixtures Ar + 30% He, Ar + 10% N2, and Ar + 10% vol.% H2 in a closed chamber containing the same atmosphere and in air and the extents of gas-metal reaction were determined by X-ray analyses. Spraying in the Ar-N2 and Ar-H2 mixtures led to some N2 and H2 uptake by Ti and Zr coatings and to some reduction of oxygen impurity in the Cu, W, Zn, and probably, Ni coatings. Coatings sprayed in air contained appreciable amounts of the respective impurity phases Cu2O, NiO, TiN, TiO2, Ti(C,N), β-W, possibly ZnO, ZrN, and ZrO2. Samples of sprayed products collected at different distances show that metal-gas reactions occurring with the powder particles in flight is often a minor source of contamination compared to that stemming from gas uptake by the coating after the metal is deposited. Deviations from the Engelke difficulty of melting parameter occurs when a sufficiently intense chemical reaction takes place between the metal particles and the plasma gases. (orig.)

  9. In vitro chemical and biological effects of Ag, Cu and Cu + Zn adjunction in 46S6 bioactive glasses

    Science.gov (United States)

    Bunetel, L.; Wers, E.; Novella, A.; Bodin, A.; Pellen-Mussi, P.; Oudadesse, H.

    2015-09-01

    Three bioactive glasses belonging to the system SiO2-CaO- Na2O-P2O5 elaborated by conventional melt-quenching techniques were doped with silver, copper and copper + zinc. They were characterized using the usual physical methods. Human osteoblast cells Saos-2 and human endothelial cells EAhy926 were used for viability assays and to assess the metallic ions, self toxicity. Human monocyte cells THP-1 were used to measure interleukins IL1β and IL6 release. Glass chemical structures did not vary much on introduction of metal ions. A layer of hydroxyapatite was observed on every glass after 30 days of SBF immersion. A proliferative action was seen on Saos-2 after 24 h of incubation, EAhy926 growth was not affected. For both cell lines, a moderate cytotoxicity was found after 72 h. Dose-dependent toxic effects of Ag, Cu and Zn ions were observed on Saos-2 and EAhy926 cells. Measured CD50 of silver against these two cell lines were 8 to 20 fold lower than copper and zinc’s. Except undoped control glass, all doped glasses tested showed anti-inflammatory properties by preventing IL1β and IL6 excretion by differentiated THP-1. In conclusion, strictly monitored adjunction of metal ions to bioglasses ensures good anti-inflammatory properties without altering their biocompatibility.

  10. Resistance pressure sensor based on Ag/Cu/sub 2/O-PEPC-NiPc/Al composite

    International Nuclear Information System (INIS)

    This work reports on the fabrication and investigation of pressure sensor based on Ag/Cu/sub 2/O-PEPC-NiPc/Al composite. The active layer of the composite was deposited by drop-casting of the blend Cu/sub 2/O-PEPC-NiPc on flexible substrate. The thin film of the blend consist of cuprous oxide (Cu/sub 2/O) micropowder, (5 wt. %), poly-N-epoxypropyl carbazole (PEPC), (2 wt. %) and nickel phthalocyanine (NiPc) micropowder, (3 wt. %) in benzol (1 ml). The film thickness of the composite is in the range of 20-30 mu m. It is found that the fabricated sensor is sensitive to pressure and showed good repeatability. The decrease in resistance of the sensor is observed 10 times by increasing the external uniaxial pressure up to 11.7 kNm/sup -2/. The experimentally obtained results are compared with the simulated results and showed reasonable agreement with each other. (author)

  11. PANI-Ag-Cu Nanocomposite Thin Films Based Impedimetric Microbial Sensor for Detection of E. coli Bacteria

    Directory of Open Access Journals (Sweden)

    Huda Abdullah

    2014-01-01

    Full Text Available PANI-Ag-Cu nanocomposite thin films were prepared by sol-gel method and deposited on the glass substrate using spin coating technique. Polyaniline was synthesized by chemical oxidative polymerization of aniline monomer in the presence of nitric acid. The films were characterized using XRD, FTIR, and UV-Visible spectroscopy. The performance of the sensor was conducted using electrochemical impedance spectroscopy to obtain the change in impedance of the sensor film before and after incubation with E. coli bacteria in water. The peaks in XRD pattern confirm the presence of Ag and Cu nanoparticles in face-centered cubic structure. FTIR analysis shows the stretching of N–H in the polyaniline structure. The absorption band from UV-Visible spectroscopy shows high peaks between 400 nm and 500 nm which indicate the presence of Ag and Cu nanoparticles, respectively. Impedance analysis indicates that the change in impedance of the films decreases with the presence of E. coli. The sensitivity on E. coli increases for the sample with high concentration of Cu.

  12. Microstructure-based modeling of the ageing effect on the deformation behavior of the eutectic micro-constituent in SnAgCu lead-free solder

    International Nuclear Information System (INIS)

    The eutectic micro-constituent in SnAgCu solder governs the deformation behavior of the joint as it shows better deformation resistance than the Sn dendrites and occupies a high volume percentage of the whole solder. The main scope of this study is to develop a three-dimensional (3-D) homogenization model taking into account the microstructural evolution in the eutectic micro-constituent of SnAgCu solder in order to simulate the change in mechanical behavior of the joint caused by isothermal ageing. For this purpose, 3-D configurations of Ag3Sn and Cu6Sn5 intermetallic compounds (IMCs) in near-eutectic SnAgCu solder are visualized in the as-soldered condition and after ageing by focused ion beam/scanning electron microscopy tomography. The tomographic images are used to generate feature-preserving finite element meshes of the actual microstructures. The representative volume element size and constitutive behavior of the eutectic mixture in the two conditions are determined by a numerical homogenization procedure. The results show a considerable reduction in the yield stress level of the eutectic micro-constituent after ageing of the solder joint. It is shown that the increase in the inter-particle spacing and decrease in the aspect ratio of IMCs due to ageing cause a significant change in the strain distribution in the tin matrix, which leads to a lower contribution of IMCs in load-sharing and yield strength of aged solder. The elastic–plastic properties of as-soldered and aged eutectic mixtures are determined by nanoindentation. The results of homogenization are validated through comparison with experimental results and prediction of the dislocation detachment theory.

  13. Accelerated Bonding of Magnesium and Aluminum with a CuNi/Ag/CuNi Sandwich Interlayer by Plasma-Activated Sintering

    Science.gov (United States)

    Wang, Yiyu; Rao, Mei; Li, Leijun; Luo, Guoqiang; Shen, Qiang; Zhang, Lianmeng

    2016-02-01

    Plasma-activated sintering (PAS) has been applied, for the first time, to join magnesium and aluminum using a CuNi/Ag/CuNi sandwich structural interlayer. A cleaning effect and high efficient plasma heating mode in PAS have contributed to forming a strong interfacial diffusion bond under low temperature 673 K (400 °C) and short dwell time (0.6 ks). The designed interlayer provides a diffusion barrier effect and an enhanced physical contact between the interfaces. Strong bonding has been achieved without forming the brittle Mg-Al intermetallics.

  14. Toxicity of Ag, CuO and ZnO nanoparticles to selected environmentally relevant test organisms and mammalian cells in vitro: a critical review

    OpenAIRE

    Bondarenko, Olesja; Juganson, Katre; Ivask, Angela; Kasemets, Kaja; Mortimer, Monika; Kahru, Anne

    2013-01-01

    Nanoparticles (NPs) of copper oxide (CuO), zinc oxide (ZnO) and especially nanosilver are intentionally used to fight the undesirable growth of bacteria, fungi and algae. Release of these NPs from consumer and household products into waste streams and further into the environment may, however, pose threat to the ‘non-target’ organisms, such as natural microbes and aquatic organisms. This review summarizes the recent research on (eco)toxicity of silver (Ag), CuO and ZnO NPs. Organism-wise it f...

  15. Reliability of Sn/Pb and Lead-Free (SnAgCu) Solders of Surface Mounted Miniaturized Passive Components for Extreme Temperature (-185 C to +125 C) Space Missions

    Science.gov (United States)

    Ramesham, Rajeshuni

    2011-01-01

    Surface mount electronic package test boards have been assembled using tin/lead (Sn/Pb) and lead-free (Pb-free or SnAgCu or SAC305) solders. The soldered surface mount packages include ball grid arrays (BGA), flat packs, various sizes of passive chip components, etc. They have been optically inspected after assembly and subsequently subjected to extreme temperature thermal cycling to assess their reliability or future deep space, long-term, extreme temperature environmental missions. In this study, the employed temperature range (-185oC to +125oC) covers military specifications (-55oC to +100oC), extreme old Martian (-120oC to +115oC), asteroid Nereus (-180oC to +25oC) and JUNO (-150oC to +120oC) environments. The boards were inspected at room temperature and at various intervals as a function of extreme temperature thermal cycling and bake duration. Electrical resistance measurements made at room temperature are reported and the tests to date have shown some change in resistance as a function of extreme temperature thermal cycling and some showed increase in resistance. However, the change in interconnect resistance becomes more noticeable with increasing number of thermal cycles. Further research work will be carried out to understand the reliability of packages under extreme temperature applications (-185oC to +125oC) via continuously monitoring the daisy chain resistance for BGA, Flat-packs, lead less chip packages, etc. This paper will describe the experimental reliability results of miniaturized passive components (01005, 0201, 0402, 0603, 0805, and 1206) assembled using surface mounting processes with tin-lead and lead-free solder alloys under extreme temperature environments.

  16. Lattice vibrations in an α- and β-AgCuS superionic conductor: experimental time-of-flight inelastic neutron scattering studies

    International Nuclear Information System (INIS)

    Inelastic neutron scattering (INS) measurements of a powder specimen of cation conducting AgCuS have been performed in its β-phase at 298 and 348 K and in its α-phase at 398 K by neutron time-of-flight (TOF) scattering. The neutron-weighted phonon density of states, G(ε), of the superionic and non-superionic phases of AgCuS has been obtained. G(ε) reveals a non-Debye behaviour at low energy that is caused by the presence of low-energy modes at 2.6 meV observed in the dynamic structure factor. The origin of this mode is not clear. The β→α phase transition at 366 K is accompanied by considerable softening of several modes and simultaneous broadening of all peaks that result in a large increase of quasi-elastic intensity. Thermodynamic variables have been derived on the basis of G(ε)

  17. Phase transformation and morphology of the intermetallic compounds formed at the Sn-9Zn-3.5Ag/Cu interface in aging

    Energy Technology Data Exchange (ETDEWEB)

    Hon, M.-H. [Department of Materials Science and Engineering, National Cheng Kung University, 1 Ta-Hsueh Road, Tainan 70101, Taiwan (China); Chang, T.-C. [Department of Materials Science and Engineering, National Cheng Kung University, 1 Ta-Hsueh Road, Tainan 70101, Taiwan (China); Electronic and Optoelectronics Research Laboratories, Industrial Technology Research Institute, Bldg. 11, 195, Sec. 4, Chung-Hsing Road, Chutung, Hsinchu, 310, Taiwan (China); Wang, M.-C. [Faculty of Fragrance and Cosmetics, Kaohsiung Medical University, 100 Shi-Chuan 1st Road, Kaohsiung 807, Taiwan (China)], E-mail: mcwang@kmu.edu.tw

    2008-06-30

    The morphology and phase transformation of the intermetallic compounds (IMCs) formed at the Sn-9Zn-3.5Ag/Cu interface in a solid-state reaction have been investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM), electron diffraction (ED), scanning electron microscopy (SEM) and energy dispersive spectrometry (EDS). The monoclinic {eta}'-Cu{sub 6}Sn{sub 5} transforms to the hexagonal {eta}-Cu{sub 6}Sn{sub 5} and the orthorhombic Cu{sub 5}Zn{sub 8} transforms to the body-centered cubic (bcc) {gamma}-Cu{sub 5}Zn{sub 8} as aged at 180 deg. C. The scallop-shaped Cu{sub 6}Sn{sub 5} layer is retained after aging at 180 deg. C for 1000 h. In the solid-state reaction, Ag is repelled from {eta}'-Cu{sub 6}Sn{sub 5} and reacts with Sn to form Ag{sub 3}Sn, and the Cu{sub 5}Zn{sub 8} layer decomposes. Kirkendall voids are not observed at the Sn-9Zn-3.5Ag/Cu interface even after aging at 180 deg. C for 1000 h.

  18. Phase transformation and morphology of the intermetallic compounds formed at the Sn-9Zn-3.5Ag/Cu interface in aging

    International Nuclear Information System (INIS)

    The morphology and phase transformation of the intermetallic compounds (IMCs) formed at the Sn-9Zn-3.5Ag/Cu interface in a solid-state reaction have been investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM), electron diffraction (ED), scanning electron microscopy (SEM) and energy dispersive spectrometry (EDS). The monoclinic η'-Cu6Sn5 transforms to the hexagonal η-Cu6Sn5 and the orthorhombic Cu5Zn8 transforms to the body-centered cubic (bcc) γ-Cu5Zn8 as aged at 180 deg. C. The scallop-shaped Cu6Sn5 layer is retained after aging at 180 deg. C for 1000 h. In the solid-state reaction, Ag is repelled from η'-Cu6Sn5 and reacts with Sn to form Ag3Sn, and the Cu5Zn8 layer decomposes. Kirkendall voids are not observed at the Sn-9Zn-3.5Ag/Cu interface even after aging at 180 deg. C for 1000 h

  19. Superior effect of Ni-substitution on the hydrogenation kinetics of Mg6Pd1−xTMx (TM = Ag, Cu, Ni) pseudo-binary compounds

    International Nuclear Information System (INIS)

    Highlights: • Kinetics of (de)hydrogenation of Mg6(Pd,TM) TM = Ag, Cu and Ni compared. • Faster hydrogenation kinetics for the Ni compound. • Faster H-desorption for the Ni compound due to MgH2/Mg2NiH4 synergy. - Abstract: In this investigation, the H-sorption kinetics of Mg6Pd and Mg6Pd1−xTMx (TM = Ag, Cu, Ni) pseudo-binary compounds at the TM solubility limit have been studied by isothermal hydrogen absorption, thermal desorption spectroscopy and in situ neutron diffraction. Among all studied compounds, the fastest absorption kinetics takes place for the Ni-substituted one. The fit of the absorption curves to established model equations for solid–gas reaction shows that hydrogenation is controlled by diffusion. As for desorption, the peak temperature for the Ni-substituted compound is 90 K below that of MgH2/Mg system and is characterised by a low activation energy of 68 kJ/molH2. To better understand these results, neutron diffraction experiments during in situ thermal desorption of deuterated Mg6Pd and Mg6Pd0.25Ni0.75 compounds were carried out. These experiments demonstrate a synergetic effect between MgH2 and Mg2NiH4 hydrides as responsible for the remarkable kinetics of the Ni-containing compound

  20. Monetary alloys in Iron Age Armorica (Finistère, France): The singular case of the Osismi tribe

    Science.gov (United States)

    Guerra, M. F.; Abollivier, Ph.

    2016-06-01

    The analysis by PIXE and PAA of 64 coins struck in Iron Age Armorica by the Osismi tribe revealed the use of a different system from the usual Celtic Gaul tri-metallic system. The gold-based alloy (Au-Ag-Cu) firstly issued is debased over time to become a silver-based alloy (Ag-Cu-Sn). Based on the analytical data, two chronological phases were defined and dates of issuing could be ascribed to the coin-types. The presence of Sn and Sb in the alloys and the low contents of Pb were used in the attribution of 9 specimens of unknown origin to the Osismi monetary system. Considerations on the mints supplies could also be provided.

  1. Development of a supramolecular ensemble of an AIEE active hexaphenylbenzene derivative and Ag@Cu2O core-shell NPs: an efficient photocatalytic system for C-H activation.

    Science.gov (United States)

    Chopra, Radhika; Kumar, Manoj; Bhalla, Vandana

    2016-08-01

    A supramolecular ensemble having Ag@Cu2O core-shell nanoparticles stabilized by aggregates of a hexaphenylbenzene derivative has been developed which exhibits excellent photocatalytic efficiency in reactions involving preparation of imidazole and benzimidazole derivatives via C-H activation. PMID:27464360

  2. Journals Abroad

    Science.gov (United States)

    Ando, Shoichi

    1975-01-01

    This article summarizes four journal articles on language teaching appearing in the American pedagogical language journals, "The Modern Language Journal,""English Language Teaching Journal," and "TESOL Quarterly." The purpose is to give an indication of what kinds of articles can be found in journals outside Japan. (Text is in Japanese.) (TL)

  3. Influence of nanoparticle addition on the formation and growth of intermetallic compounds (IMCs) in Cu/Sn-Ag-Cu/Cu solder joint during different thermal conditions

    Science.gov (United States)

    Tan, Ai Ting; Tan, Ai Wen; Yusof, Farazila

    2015-06-01

    Nanocomposite lead-free solders are gaining prominence as replacements for conventional lead-free solders such as Sn-Ag-Cu solder in the electronic packaging industry. They are fabricated by adding nanoparticles such as metallic and ceramic particles into conventional lead-free solder. It is reported that the addition of such nanoparticles could strengthen the solder matrix, refine the intermetallic compounds (IMCs) formed and suppress the growth of IMCs when the joint is subjected to different thermal conditions such as thermal aging and thermal cycling. In this paper, we first review the fundamental studies on the formation and growth of IMCs in lead-free solder joints. Subsequently, we discuss the effect of the addition of nanoparticles on IMC formation and their growth under several thermal conditions. Finally, an outlook on the future growth of research in the fabrication of nanocomposite solder is provided.

  4. Journal of Nuclear Materials - Radiation-induced segregation and phase stability in ferritic-martensitic alloy T 91

    Energy Technology Data Exchange (ETDEWEB)

    Jiao, Zhijie [ORNL; Busby, Jeremy T [ORNL; Was, Gary S [ORNL; Jiao, Zhijie [University of Michigan

    2010-01-01

    Radiation-induced segregation in ferritic martensitic alloy T 91 was studied to understand the behavior of solutes as a function of dose and temperature. Irradiations were conducted using 2 MeV protons to doses of 1, 3, 7 and 10 dpa at 400 C. Radiation-induced segregation at prior austenite grain boundaries was measured, and various features of the irradiated microstructure were characterized, including grain boundary carbide coverage, the dislocation microstructure, radiation-induced precipitation and irradiation hardening. Results showed that Cr, Ni and Si segregate to prior austenite grain boundaries at low dose, but segregation ceases and redistribution occurs above 3 dpa. Grain boundary carbide coverage mirrors radiation-induced segregation. Irradiation induces formation of Ni Si Mn and Cu-rich precipitates that account for the majority of irradiation hardening. Radiation-induced segregation behavior is likely linked to the evolution of the precipitate and dislocation microstructures. 2010 Elsevier B.V. All rights reserved

  5. Comment on 'Thermodynamic description of the Hg-Te system' [Journal of Alloys and Compounds 494 (1-2) (2010) 102-108

    Energy Technology Data Exchange (ETDEWEB)

    Kang, Youn-Bae, E-mail: ybkang@postech.ac.k [Graduate Institute of Ferrous Technology (GIFT), Pohang University of Science and Technology, Hyojadong, Pohang, Kyungbuk 790-784 (Korea, Republic of)

    2010-09-03

    Recently Gierlotka [Journal of Alloys and Compounds 494 (1-2) (2010) 102-108] reported on thermodynamic assessments of the Hg-Te binary system using (1) two-sublattice ionic model, (2) associate model, and (3) random mixing model for the liquid phase. And a conclusion was made such that the two-sublattice ionic model and the associate model are superior to the random mixing model in describing thermodynamic properties and phase diagram of the Hg-Te system, and the two-sublattice ionic model seems to be more suitable for describing Hg-Te binary system due to ionic behavior of the Hg-Te liquid. Purpose of the present letter is to point out that (1) the two-sublattice ionic model and the associate model can be made mathematically the same in a binary system as in the Hg-Te system, therefore two different assessments using either the two-sublattice ionic model or the associate model by Gierlotka are essentially very similar as long as the parameters used in both models are similar, and (2) the two models can also be made mathematically equivalent even in higher order system under certain conditions.

  6. The mobility of vacancies and interstitials in Ag-Cu studied by high-voltage electron microscopy

    International Nuclear Information System (INIS)

    A study has been carried out by high-voltage electron microscopy on the relative mobility of vacancies and interstitials in an Ag-017 at% Cu alloy at temperatures between 345 K and 775 K. It is found that in the whole temperature range the mobility of vacancies is higher than that of interstitials. This can be explained by the formation of interstitial-solute complexes retarding interstitial motion. During prolonged irradiation solute segregation occurs to sinks with the result that the interstitial mobility increases to the extent that it eventually surpasses that of the vacancies. (author)

  7. The study of mechanical properties of Sn-Ag-Cu lead-free solders with different Ag contents and Ni doping under different strain rates and temperatures

    International Nuclear Information System (INIS)

    Research highlights: → The effect of Ag content on the mechanical properties of Sn-Ag-Cu lead-free solders was studied systematically and the Ag content and strain rate-dependent material constitutive models have been developed for the first time. The effect of Ag content on the microstructures of Sn-Ag-Cu solder was also studied. The effect of Ni doping on the mechanical properties of Sn-1.0Ag-0.5Cu solder was also investigated and the temperature and strain rate-dependent material constitutive model has been developed for Sn-1.0Ag-0.5Cu-0.02Ni solder, which is essential for finite element simulation for assessment of reliability of electronic assembly with such solder. - Abstract: In this paper, the tensile tests were conducted at 25 oC to investigate the effect of Ag content and Ni doping on the microstructures and mechanical properties of Sn-3.0Ag-0.5Cu, Sn-2.0Ag-0.5Cu, Sn-1.0Ag-0.5Cu, Sn-1.0Ag-0.5Cu-0.05Ni and Sn-1.0Ag-0.5Cu-0.02Ni solders. The effect of strain rate on mechanical properties was investigated for each solder using stain rates of 10-5 s-1, 10-4 s-1, 10-3 s-1, 10-2 s-1 and 10-1 s-1. In addition, the effect of temperature on mechanical properties was investigated for Sn-1.0Ag-0.5Cu-0.02Ni solder by conducting tests at -35 oC, 25 oC, 75 oC and 125 oC. Test results show that the elastic modulus, yield stress and ultimate tensile strength increase with increasing strain rate and Ag content, but they decrease with increasing temperature. The elastic modulus, yield stress and ultimate tensile strength are lower and the elongation is larger for Sn-1.0Ag-0.5Cu-0.05Ni solder compared with Sn-1.0Ag-0.5Cu-0.02Ni solder. The strain rate and Ag content dependent mechanical property models have been developed for Sn-Ag-Cu solders for the first time. In addition, the temperature and rate-dependent mechanical property models have also been developed for Sn-1.0Ag-0.5Cu-0.02Ni solder. The microstructures of solders were also analyzed. The Ag content affects Ag3Sn

  8. A study of the point-defect mobility in Ag-Cu by high-voltage electron microscopy

    International Nuclear Information System (INIS)

    A study is carried out by high-voltage electron microscopy on the relative mobility of interstitials and vacancies in an Ag-0.17 at% Cu alloy in the temperature range of 300 to 775 K. Shortly after starting the irradiation stacking-fault tetrahedra are formed in the whole range of temperatures investigated. This indicates that the mobility of vacancies is higher than that of self-interstitials. This can be explained by the formation of interstitial-solute complexes retarding interstitial motion. During further irradiation solute segregation occurs to point-defect sinks with the result that the interstitial mobility increases to the extent that it eventually surpasses that of the vacancies. (author)

  9. Timing of porphyry (Cu-Mo) and base metal (Zn-Pb-Ag-Cu) mineralisation in a magmatic-hydrothermal system—Morococha district, Peru

    Science.gov (United States)

    Catchpole, Honza; Kouzmanov, Kalin; Bendezú, Aldo; Ovtcharova, Maria; Spikings, Richard; Stein, Holly; Fontboté, Lluís

    2015-12-01

    The Morococha district in central Peru is characterised by economically important Cordilleran polymetallic (Zn-Pb-Ag-Cu) vein and replacement bodies and the large Toromocho porphyry Cu-Mo deposit in its centre. U-Pb, Re-Os, and 40Ar/39Ar geochronology data for various porphyry-related hydrothermal mineralisation styles record a 3.5-Ma multi-stage history of magmatic-hydrothermal activity in the district. In the late Miocene, three individual magmatic-hydrothermal centres were active: the Codiciada, Toromocho, and Ticlio centres, each separated in time and space. The Codiciada centre is the oldest magmatic-hydrothermal system in the district and consists of a composite porphyry stock associated with anhydrous skarn and quartz-molybdenite veins. The hydrothermal events are recorded by a titanite U-Pb age at 9.3 ± 0.2 Ma and a molybdenite Re-Os age at 9.26 ± 0.03 Ma. These ages are indistinguishable from zircon U-Pb ages for porphyry intrusions of the composite stock and indicate a time span of 0.2 Ma for magmatic-hydrothermal activity. The small Ticlio magmatic-hydrothermal centre in the west of the district has a maximum duration of 0.3 Ma, ranging from porphyry emplacement to porphyry mineralisation at 8.04 ± 0.14 Ma (40Ar/39Ar muscovite cooling age). The Toromocho magmatic-hydrothermal centre has a minimum of five recorded porphyry intrusions that span a total of 1.3 Ma and is responsible for the formation of the giant Toromocho Cu-Mo deposit. At least two hydrothermal pulses are identified. Post-dating a first pulse of molybdenite mineralisation, wide-spread hydrous skarn covers an area of over 6 km2 and is recorded by five 40Ar/39Ar cooling ages at 7.2-6.8 Ma. These ages mark the end of the slowly cooling and long-lived Toromocho magmatic-hydrothermal centre soon after last magmatic activity at 7.26 ± 0.02 Ma. District-wide (50 km2) Cordilleran base metal vein and replacement bodies post-date the youngest recorded porphyry mineralisation event at Toromocho

  10. Galvanic corrosion of two noble dental alloys in modified artificial saliva

    OpenAIRE

    Capelo, Sofia; Salvador Fernandes, João; Barão, Maria José; Proença, Luís; Fonseca, I.T.E.

    2014-01-01

    The composition of saliva is affected by Diabetes Mellitus with consequences in the oral homeostasis, being important to understand how dentistry alloys behave in this medium. This study aims to evaluate the corrosion resistance of two noble alloys, namely, Cerapall® 2 (Au-Pd-Cu-In) and Pontor® 2 (Au-Pt-Ag-Cu) using diverse artificial oral composition. Diabetic patients present reduced salivary flow rate, increased salivary glucose and more acidic salivary pH. The combinations of these factor...

  11. Characteristics Of Sn-Zn Cast Alloys With The Addition Of Ag And Cu

    OpenAIRE

    Gancarz T.; Pstruś J.

    2015-01-01

    The aim of this work was to study the effects of Ag and Cu on the thermal properties and microstructure of Sn-Zn-Ag-Cu cast alloys. Solders based on eutectic Sn-Zn containing 0.5 to 1.0 at.% of Ag and Cu were developed for wave soldering. DSC measurements were performed to determine the melting temperatures of the alloys. TMA and electrical resistivity measurements were performed between −50 and 150°C and between 30 and 150°C, respectively. Small precipitates of Cu5Zn8, CuZn4, and AgZn3 were ...

  12. A comparative computational study on hydrogen adsorption on the Ag(+), Cu(+), Mg(2+), Cd(2+), and Zn(2+) cationic sites in zeolites.

    Science.gov (United States)

    Kozyra, Paweł; Piskorz, Witold

    2016-05-14

    In this article the interaction between H2 and Ag(+), Cu(+), Mg(2+), Cd(2+), and Zn(2+) cations in cluster models of several sizes has been studied computationally. Depending on the changes imposed by the adsorption process on the H2 molecule the activation can vary in a wide range - from only slight weakening of the H-H bond to complete dissociation of the H2 molecule. The NOCV (Natural Orbitals for Chemical Valence) analysis allowed for decomposition of the electron density distortion into contributions easier for interpretation. Three essential factors have been identified (i-iii). In the case of bare cations the main contribution is a donation from σH2 to the cation (i). When a zeolite framework surrounding the cation is introduced, it hinders σ-donation and enhances π-backdonation from the cation to the antibonding orbital of the molecule (ii). For Cu(i) and Ag(i) sites π-backdonation becomes dominant, while for Mg(ii), Cd(ii), and Zn(ii) cations, the σ-donation, albeit diminished, still remains a dominant contribution. Calculations showed that the localization and coordination of Zn(ii) have crucial influence on its interaction with H2. We identified a Zn(2+) position at which the H2 molecule dissociates - here the interaction between H2 and oxygen framework (iii) plays a crucial role. Based on the calculations the mechanism of H2 transformation has been proposed. Upon heterolytic dissociation of H2 the Zn(0) moiety and two OH groups can be formed. Eventually, in two elementary steps, the H2 molecule can be restored. In this case, the ability of the site to activate/dissociate hydrogen is caused by the low coordination number of the zinc cation and the geometry of the site which allows positively charged H2 to interact with framework oxygen what enhances the formation of OH and Z-O-(ZnH)(+) groups. PMID:27092373

  13. Study of the effects of MeV Ag, Cu, Au, and Sn implantation on the optical properties of LiNbO3

    International Nuclear Information System (INIS)

    The authors present the results of characterization of linear absorption and nonlinear refractive index of Au, Ag, Cu and Sn ion implantation into LiNbO3. Ag was implanted at 1.5 MeV to fluences of 2 to 17 x 10 16/cm2 at room temperature. Au and Cu were implanted to fluences of 5 to 20 x 1016/cm2 at an energy of 2.0 MeV. Sn was implanted to a fluence of 1.6 x 1017/cm2 at 160 kV. Optical absorption spectrometry indicated an absorption peak for the Au implanted samples after heat treatment at 1,000 C at 620 nm. The Ag implanted samples absorption peaks shifted from 450 nm before heat treatment to 550 nm after 500 C for 1h. Heat treatment at 800 C returned the Ag implanted crystals to a clear state. Cu nanocluster absorption peaks disappears at 500 C. No Sn clusters were observed by optical absorption or XRD. The size of the Ag and Au clusters as a function of heat treatment were determined from the absorption peaks. The Ag clusters did not change appreciably in size with heat treatment. The Au clusters increased from 3 to 9 nm diameter upon heat treatment at 1000 deg C. TEM analysis performed on a Au implanted crystal indicated the formation of Au nanocrystals with facets normal to the c-axis. Measurements of the nonlinear refractive indices were carried out using the Z-scan method with a tunable dye laser pumped by a frequency doubled mode-locked Nd:YAG laser. The dye laser had a 4.5 ps pulse duration time and 76 MHz pulse repetition rate (575 nm)

  14. Ethnographic journalism

    DEFF Research Database (Denmark)

    Hermann, Anne Kirstine

    Accounting for emerging journalistic genres is a difficult endeavor not least because there is little agreement as to what constitutes journalism itself. Doing so, however, is essential if we are to recognize changing journalistic doxas. To capture such changes, we must include a holistic framework...... trends require more contextual reporting, ethnographic journalism emerges in American feature journalism. Analyzed holistically, this genre is characterized as the employment of immersion strategies adopted from social science for distinct storytelling purposes. These methods, however, transform...... conventional journalistic epistemology, changing it through practice. In turn, the analysis reveals how journalism practices can evolve its troubled philosophical position...

  15. Ethnographic journalism

    DEFF Research Database (Denmark)

    Hermann, Anne Kirstine

    2016-01-01

    Accounting for emerging journalistic genres is a difficult endeavor not least because there is little agreement as to what constitutes journalism itself. Doing so, however, is essential if we are to recognize changing journalistic doxas. To capture such changes, we must include a holistic framework...... require more contextual reporting, ethnographic journalism emerges in American feature journalism. Analyzed holistically, this genre is characterized as the employment of immersion strategies adopted from social science for distinct storytelling purposes. These methods, however, transform conventional...... journalistic epistemology, changing it through practice. In turn, the analysis reveals how journalism practices can evolve its troubled philosophical position...

  16. Investigating the thermomechanical properties and intermetallic layer formation of Bi micro-alloyed low-Ag content solders

    International Nuclear Information System (INIS)

    Highlights: • Thermomechanical properties of SnAgCu and micro-alloyed solders were investigated. • Intermetallic layer growth of SnAgCu and micro-alloyed solders was investigated. • The Cu6Sn5 intermetallic layer growth during soldering was lower in SnAgCu alloys. • The layer growth during Thermal Shock was lower in micro-alloyed solders. • The SnAg0.3Cu0.7Bi0.1Sb0.01 alloy has the best thermomechanical properties. - Abstract: In our research, we performed comparative analyses concerning various lead-free SAC (Sn96.5Ag3Cu0.5, Sn95.5Ag4Cu0.5) and two types of micro-alloyed SAC (SnAgCu + Bi + Sb) solder alloys. The mechanical properties of these solder alloys were characterised by measuring the shear strength of 0603 (1.5 × 0.75 mm) size chip resistors’ joints. We designed a testboard, which contains fifty pieces of 0603 size resistors for mechanical characterisation and for measuring the thickness of intermetallic layers. During the experiment, twenty-eight pieces of testboards were soldered with vapour phase soldering (seven with each solder alloy) and sixteen of them were subjected to Thermal-Shock (TS) life-time tests with temperature range of +140 to −40 °C up to 2000 cycles. The intermetallic layer (IML) formation was investigated with Scanning Electron Microscopy (SEM) and Scanning Transmission Electron Microscopy (STEM) methods; and the growth of the layer was analysed by measuring the IML thickness on cross-sectional samples after given TS cycles. It is shown that the thickness of the intermetallic layer in as-reflowed samples (samples without aging) depends on the silver content of the given alloy. Besides, the layer growth rate during Thermal Shock tests is affected by the number of intermetallic layer grain-boundaries along a unit of length

  17. Investigating the thermomechanical properties and intermetallic layer formation of Bi micro-alloyed low-Ag content solders

    Energy Technology Data Exchange (ETDEWEB)

    Krammer, Olivér, E-mail: krammer@ett.bme.hu [Department of Electronics Technology, Budapest University of Technology and Economics, Egry J. u. 18., Budapest H-1111 (Hungary); Garami, Tamás [Department of Electronics Technology, Budapest University of Technology and Economics, Egry J. u. 18., Budapest H-1111 (Hungary); Horváth, Barbara [National Institute for Materials Science, 1-2-1 Sengen, Tsukuba 305-0047 (Japan); Hurtony, Tamás; Medgyes, Bálint; Jakab, László [Department of Electronics Technology, Budapest University of Technology and Economics, Egry J. u. 18., Budapest H-1111 (Hungary)

    2015-06-15

    Highlights: • Thermomechanical properties of SnAgCu and micro-alloyed solders were investigated. • Intermetallic layer growth of SnAgCu and micro-alloyed solders was investigated. • The Cu{sub 6}Sn{sub 5} intermetallic layer growth during soldering was lower in SnAgCu alloys. • The layer growth during Thermal Shock was lower in micro-alloyed solders. • The SnAg0.3Cu0.7Bi0.1Sb0.01 alloy has the best thermomechanical properties. - Abstract: In our research, we performed comparative analyses concerning various lead-free SAC (Sn96.5Ag3Cu0.5, Sn95.5Ag4Cu0.5) and two types of micro-alloyed SAC (SnAgCu + Bi + Sb) solder alloys. The mechanical properties of these solder alloys were characterised by measuring the shear strength of 0603 (1.5 × 0.75 mm) size chip resistors’ joints. We designed a testboard, which contains fifty pieces of 0603 size resistors for mechanical characterisation and for measuring the thickness of intermetallic layers. During the experiment, twenty-eight pieces of testboards were soldered with vapour phase soldering (seven with each solder alloy) and sixteen of them were subjected to Thermal-Shock (TS) life-time tests with temperature range of +140 to −40 °C up to 2000 cycles. The intermetallic layer (IML) formation was investigated with Scanning Electron Microscopy (SEM) and Scanning Transmission Electron Microscopy (STEM) methods; and the growth of the layer was analysed by measuring the IML thickness on cross-sectional samples after given TS cycles. It is shown that the thickness of the intermetallic layer in as-reflowed samples (samples without aging) depends on the silver content of the given alloy. Besides, the layer growth rate during Thermal Shock tests is affected by the number of intermetallic layer grain-boundaries along a unit of length.

  18. JOURNAL INFORMATION

    Institute of Scientific and Technical Information of China (English)

    2008-01-01

    Journal of Shenzhen University Journal of Shenzhen University Science and Engineering (ISSN 1000-2618) started publication in 1984 and is issued quarterly on 112 A4 pages. Its main topics cover the disciplines of electron optics and infor- mation engineering, architecture and civ

  19. Lifestyle Journalism

    DEFF Research Database (Denmark)

    From, Unni; Kristensen, Nete Nørgaard

    2013-01-01

    Lifestyle journalism has experienced enormous growth in the media over the past two decades, but scholars in the fields of journalism and communication studies have so far paid relatively little attention to a field that is still sometimes seen as "not real journalism". There is now an urgent need......, social and cultural tensions within it. Taking a comparative view, the collection includes studies covering four continents, including countries such as Australia, China, Norway, Denmark, Singapore, the UK and the USA. While keeping the broader lifestyle field in mind, the chapters focus on a variety of...... sub-fields such as travel, music, food, health, fashion and personal technology journalism. This volume provides a fascinating account of the different facets of lifestyle journalism, and charts the way forward for a more sustained analysis of the field. This book was originally published as a special...

  20. Journal Watch

    Directory of Open Access Journals (Sweden)

    Jennifer Herzog

    2012-08-01

    Full Text Available The Journal Watch section highlights published journal articles which discuss recent developments and new technology used in microbiology and related fields. In this issue, highlighted articles include an examination of the ED pathway’s role in microbial sugar metabolism and in the upregulation of virulence genes, landmark companion papers from the Human Microbiome Project Consortium regarding population-scale metagenomic studies, and a new method for in vitro culturing of the malarial parasite for application in drug and vaccine development.

  1. Journalism Forum

    Science.gov (United States)

    Journalism Educator, 1985

    1985-01-01

    Includes (1) survey results indicating value of traditional journalism and mass communication research; (2) survey results indicating knowledge of grammar, economics, and government are journalists' most valuable resources; (3) methods for teaching listening skills; (4) suggestions for giving public relations students an overview online services;…

  2. New journals

    NARCIS (Netherlands)

    NN,

    1977-01-01

    Brunonia is the title of a journal that will replace the Contributions from Herbarium Australiense (last no. 17, 1976). Subscriptions Aust. $ 4. annual, Herbarium Australiense, P.O. Box 1600, Canberra City, A.C.T. 2601, Australia. Nature Malaysiana, published quarterly by Tropical Press, 64A Jl. Buk

  3. Bottom-Up Nanofabrication of Supported Noble Metal Alloy Nanoparticle Arrays for Plasmonics

    DEFF Research Database (Denmark)

    Nugroho, Ferry A. A.; Iandolo, Beniamino; Wagner, Jakob Birkedal; Langhammer, Christoph

    2016-01-01

    concept, we focus on Au-based binary and ternary alloy systems with Ag, Cu, and Pd, due to their high relevance for nanoplasmonics and complete miscibility, and characterize their optical properties. Moreover, as an example for the relevance of the obtained materials for integration in devices, we......Mixing different elements at the nanoscale to obtain alloy nanostructures with fine-tuned physical and chemical properties offers appealing opportunities for nanotechnology and nanoscience. However, despite widespread successful application of alloy nanoparticles made by colloidal synthesis in...... optimization of the surface density. These cannot be fulfilled even using state-of-the-art self -assembly strategies of colloids. As a solution, we present here a generic bottom-up nanolithography-compatible fabrication approach for large-area arrays of alloy nanoparticles on surfaces. To illustrate the...

  4. Dissimilar joint characteristics of SiC and WC-Co alloy by laser brazing

    Science.gov (United States)

    Nagatsuka, K.; Sechi, Y.; Nakata, K.

    2012-08-01

    SiC and WC-Co alloys were joined by laser brazing with an active braze metal. The braze metal based on eutectic Ag-Cu alloy with additional Ti as an active element ranging from 0 to 2.8 mass% was sandwiched by the SiC block and WC-Co alloy plate. The brazing was carried out by selective laser beam irradiation on the WC-Co alloy plate. The content of Ti in the braze metal was required to exceed 0.6 mass% in order to form a brazed joint with a measurable shear strength. The shear strength increased with increasing Ti content up to 2.3 mass%Ti and decreased with a higher content.

  5. Tasveer Journal

    OpenAIRE

    Fox, Anna

    2016-01-01

    As part of its 10th anniversary, Tasveer is excited to present a special publication of a selection of portfolios previously featured in the Tasveer Journal, over the last four years. This print version includes a series of new texts and interviews to supplement the features as previously presented online, and will also be produced as an exhibition through the display of its unbound folios. Featuring the works of 21 artists, this publication and exhibition brings together many exciting pr...

  6. 热循环条件下SnAgCu钎料损伤行为的研究%Damage Behavior of SnAgCu Solder under Thermal Cycling

    Institute of Scientific and Technical Information of China (English)

    肖慧; 李晓延; 严永长; 刘娜; 史耀武

    2013-01-01

    The failure of solder joints under thermal cycling is mainly as a result of progressive damage process of solder materials.The objective of this study was to investigate the damage behavior of SnAgCu solder under thermal cycling condition.A damage model was proposed and employed to simulate the thermal cycling behavior of SnAgCu solder.The proposed damage evolution law was based on continuum damage mechanics and an interaction between creep and fatigue.Thermo-mechanical cycling and thermal cycling tests were conducted for model parameter determination.A special bimetallic load frame with single joint-shear solder sample was designed and used to study the damage evolution behavior of SnAgCu solder.The damage variable D=1-R0/R was selected and measured for the single joint-shear solder sample every dozens of cycles during thermal cycling tests to verify the model.The damage evolution law was deduced as power function with thermal cycles and the results show that the experimental damage data can be fitted reasonably well by the relationship as the damage model proposed.The microstructure evolution of SnAgCu solder under thermal cycling was observed by Scanning Electron Microscopy and the damage mechanism was analyzed.%电子封装焊点的热循环失效是焊点材料损伤逐步发展的结果,本工作旨在对SnAgCu钎料的热循环损伤失效行为进行研究.以连续损伤力学理论为基础,提出了一种适用于热循环条件下SnAgCu钎料蠕变-疲劳交互作用的损伤模型.据此,设计了热力循环实验和热循环实验用以标定损伤模型相关参量.自行设计了双金属剪切加载装置并结合温度循环实验,对SnAgCu钎料的热力耦合损伤行为进行了深入研究.以电阻变化率作为损伤变量,并在热循环的不同周次测量试样的损伤值从而验证损伤模型.结果表明:所提出的幂函数形式的损伤模型能较好的描述SnAgCu钎料的热循环损伤演变.最后,对热循环条件下Sn

  7. Electrical properties of thin-film structures formed by pulsed laser deposition of Au, Ag, Cu, Pd, Pt, W, Zr metals on n-6H-SiC crystal

    International Nuclear Information System (INIS)

    Diode structures with ideality factors of 1.28-2.14 and potential barriers from 0.58 to 0.62 eV on the semiconductor side were formed by pulsed laser deposition of Au, Ag, Cu, Pd, Pt, W, and Zr metal films on n-6H-SiC crystal without epitaxial layer preparation. A high density of surface acceptor and donor states was formed at the metal-semiconductor interface during deposition of the laser-induced atomic flux, which violated the correlation between the potential barrier height and metal work function. The barrier heights determined from characteristic currents and capacitance measurements were in quite good agreement. For the used low-resistance semiconductor and contact elements, the sizes of majority carrier (electron) depletion regions were determined as 26-60 nm.

  8. The crystal structure of Gabrielite, Tl2AgCu2As3S7, a new species of Thallium Sulfosalt from Lengenbach, Switzerland

    DEFF Research Database (Denmark)

    Balic-Zunic, Tonci; Makovicky, Emil; Karanovic, Ljiljana;

    2006-01-01

    5.95(Ag2.56Cu6.46) 9.02(As8.23Sb0.48) 8.71S21, was derived. The simplified formula is Tl2AgCu2As3S7. The calculated density Dcalc is 5.38 g/cm3. In reflected light, gabrielite is white, has common red internal reflections, shows weak anisotropy and moderate reflectivity [%Rmax in air (COM...... wavelengths in nm)]: 30.53(470), 29.10(546), 27.94(589), 26.35(650). The crystal structure is layered parallel to (001), which explains the habit and cleavage. The twin law with (100) as a twin plane is due to the local symmetry properties of the structural layers. A presence of metal-metal (Tl-Tl and Tl...

  9. From Journals

    Directory of Open Access Journals (Sweden)

    Nedjeljko Frančula

    2013-06-01

    Full Text Available From the field of cartography and geoinformation, there are journal’s article extracts given which are not cartographic first and whose complete texts are on the Internet, accessible to the members of Croatian academic and research community. Most journals can be accessed through the PERO browser (http://knjiznica.irb.hr/pero/index.php. For the journals not found through this browser, the complete texts of the mentioned articles are available for free on the given web-address. Next to every jo­urnal headline, in the brackets, it is noted which prominent bibliographic and quotation bases it is placed in: CC (Current Contents, SCIE (Science Citati­­on Index Expanded, and SSCI (Social Sc­­­i­ence Citation Index. It should be noted that, for some journals accessible through PERO browser, there is a delay of 6, 12 and even 18 months in accessing the newest issues. This number is given in the brackets next to the journal’s headline.Bullettin of the GSI (Geospatial Information Authority of Japanhttp://www.gsi.go.jp/ENGLISH/page_e30092.htmlK. Kawase: A general formula for calculating meridian arc length and its application to coordinate conversion in the Gauss-Krüger projection, Vol. 59, December 2011.K. Kawase: Concise derivation of extensive coordinate conversion formulae in the Gauss-Krüger pro­jection, Vol. 60, December 2012.Coordinates (A monthly magazine on positioning, navigation and beyond http://mycoordinates.orgT. Nagayama, K. Inaba, T. Hayashi, H: Nakai: Responding to the great east Japan earthquake, 2012, 12.J. SF Fabic: Data integration and sharing for disaster management, 2012, 12.D. Ampatzidis: Datum transformations using exclusively geodetic curvilinear coordinates without height information, 2012, 12.Geomatics and Environmental Engineeringhttp://journals.bg.agh.edu.pl/GEOMATICS/index.phpR. Cellmer, A. Senetra, A. Szczepanska: Land value maps of naturally valuable areas, 2012, 3.Geopolitics (CC, SSCI (12J. Strandsbjerg

  10. DFT study of Hg adsorption on M-substituted Pd(1 1 1) and PdM/γ-Al2O3(1 1 0) (M = Au, Ag, Cu) surfaces

    Science.gov (United States)

    Wang, Jiancheng; Yu, Huafeng; Geng, Lu; Liu, Jianwen; Han, Lina; Chang, Liping; Feng, Gang; Ling, Lixia

    2015-11-01

    The adsorption of Hgn (n = 1-3) on the Au-, Ag-, Cu-substituted Pd(1 1 1) surfaces as well as the PdM/γ-Al2O3(1 1 0) (M = Au, Ag, Cu) surfaces has been investigated using spin-polarized density functional theory calculations. It is found that M-substituted Pd(1 1 1) surfaces show as good Hg adsorption capacity as the perfect Pd(1 1 1) at low Hg coverage, while the Hg adsorption capacity is only slightly weakened at high Hg coverage. On the basis of stepwise adsorption energies analysis, it is concluded that M-substituted Pd(1 1 1) surfaces can contribute to the binding of Hg atom on the surfaces at high Hg coverage. The electronic properties of the second metal atoms are the main factor contributes to the Hg adsorption capacity. Gas phase Pd2 shows better Hg adsorption capacity than Pd2/γ-Al2O3, while PdM/γ-Al2O3 can adsorb Hg more efficiently than bare PdM clusters. It suggests that the γ-Al2O3 support can enhance the activity of PdM for Hg adsorption and reduces the activity of Pd2. It is also found that Pd is the main active composition responsible for the interaction of mercury with the surface for PdM/γ-Al2O3 sorbent. Taking Hg adsorption capacity and economic costs into account, Cu addition is a comparatively good candidate for Hg capture.

  11. Superior effect of Ni-substitution on the hydrogenation kinetics of Mg{sub 6}Pd{sub 1−x}TM{sub x} (TM = Ag, Cu, Ni) pseudo-binary compounds

    Energy Technology Data Exchange (ETDEWEB)

    Ponthieu, M. [MIRE-Group, Laboratorio de Física de Materiales de Interés Energético, Dpto Física de Materiales, Facultad de Ciencias, Universidad Autónoma de Madrid, 28049 Madrid (Spain); ICMPE/CNRS-UPEC, UMR 7182, 2-8 rue Henri Dunant, 94320 Thiais (France); Fernández, J.F., E-mail: josefrancisco.fernandez@uam.es [MIRE-Group, Laboratorio de Física de Materiales de Interés Energético, Dpto Física de Materiales, Facultad de Ciencias, Universidad Autónoma de Madrid, 28049 Madrid (Spain); Cuevas, F. [ICMPE/CNRS-UPEC, UMR 7182, 2-8 rue Henri Dunant, 94320 Thiais (France); Laversenne, L. [Institut Néel, CNRS, Grenoble (France); Bodega, J.; Ares, J.R.; Sánchez, C. [MIRE-Group, Laboratorio de Física de Materiales de Interés Energético, Dpto Física de Materiales, Facultad de Ciencias, Universidad Autónoma de Madrid, 28049 Madrid (Spain)

    2015-10-05

    Highlights: • Kinetics of (de)hydrogenation of Mg{sub 6}(Pd,TM) TM = Ag, Cu and Ni compared. • Faster hydrogenation kinetics for the Ni compound. • Faster H-desorption for the Ni compound due to MgH{sub 2}/Mg{sub 2}NiH{sub 4} synergy. - Abstract: In this investigation, the H-sorption kinetics of Mg{sub 6}Pd and Mg{sub 6}Pd{sub 1−x}TM{sub x} (TM = Ag, Cu, Ni) pseudo-binary compounds at the TM solubility limit have been studied by isothermal hydrogen absorption, thermal desorption spectroscopy and in situ neutron diffraction. Among all studied compounds, the fastest absorption kinetics takes place for the Ni-substituted one. The fit of the absorption curves to established model equations for solid–gas reaction shows that hydrogenation is controlled by diffusion. As for desorption, the peak temperature for the Ni-substituted compound is 90 K below that of MgH{sub 2}/Mg system and is characterised by a low activation energy of 68 kJ/molH{sub 2}. To better understand these results, neutron diffraction experiments during in situ thermal desorption of deuterated Mg{sub 6}Pd and Mg{sub 6}Pd{sub 0.25}Ni{sub 0.75} compounds were carried out. These experiments demonstrate a synergetic effect between MgH{sub 2} and Mg{sub 2}NiH{sub 4} hydrides as responsible for the remarkable kinetics of the Ni-containing compound.

  12. Study on the distributions of Cd, Co, Sr, Zn, Ag, Cu, Pb, Mn and Ni in the eolian sands of the Gavkuni playa (southeast of Isfahan

    Directory of Open Access Journals (Sweden)

    Hamidreza Pakzad

    2014-11-01

    Full Text Available Introduction Heavy metals are continually introduced into hydrosphere, atmosphere and biosphere. These potentially toxic elements can concentrate in sediments in aqueous ecosystems and they can act as pollution sources in particular conditions. Heavy metals mainly concentrate in fine sand particles because of more concentration of heavy minerals in this grain size. The Gavkhuni playa lake with an approximate area of 550 km2 is located at southeast of Isfahan, Iran. The Zayandehrud permanent river and several seasonal rivers flow into this playa. During quaternary, massive volume of sediments in sand and gravel sizes were carried into this area and deposited. These sediments are mainly deposited in the delta of Zayandehrud river (northwest of Gavkhuni playa and northwest of the sand dunes in margin of the Zayandehrud river particularly from Varzaneh to the playa. The megafans surrounding the playa can be partly origin of these sediments. The Gavkhuni playa lake is composed of three major flats namely sand, mud and salt flats. The salt flat forms the major part of the playa. Igneous, metamorphic and sedimentary (mainly carbonates rocks outcrop in the drainage basin of the Gavkhuni playa lake. Schist, gneiss, limestone, shale and andesite are the dominant lithology in this basin. The main objective of this research is to determine the concentrations of Cd, Co, Sr, Zn, Ag, Cu, Pb, Mn and Ni in the eolian sand deposits, the factors influencing the distributions of these elements and also relationship between the heavy metals and the minerals (particularly heavy minerals containing these elements. Material & Methods The eolian sands (sand dunes and sand flats of the Gavkhuni playa were sampled in 15 sampling points from north to south of the playa. Grain size distribution of the sediments were determined through dry sieving method. Heavy minerals were separated and studied through microscopy of the prepared thin and polish sections. The concentration

  13. Bonding between Carbon Fiver/Carbon composite and copper alloy

    International Nuclear Information System (INIS)

    In order to develop material for Divertor of Nuclear Fusion Reactor, we investigated bonding method between C-C material (Carbon Fiber/Carbon composite) and three kinds of heat sink materials, the microstructure of the bonding layer, shearing strength, thermal shock resistance temperature and analysis of thermal stress. C-C material was manufactured with carbon fiber oriented in one direction. Thermal conductivity of C-C is 570 W/m·k along this orientation. For heat sink material, three kinds of material, Cu, Cr-Cu alloy and W-Cu alloy were used. Results are summarized below; (1) As a brazing filler metal for bonding between C-C and copper alloy, ten kinds of brazing filler metals were investigated. As a result 2Ti-AgCu paste filler metal was selected. The brazing filler metal is excellent in wettability and as high shearing strength as a bonding layer. (2) Shearing strengths of the C-C/copper and copper alloy joints with 2Ti-AgCu paste brazing filler metal decrease in the order of C-C/Cu, C-C/Cr-Cu, C-C/W-Cu. Hardness of the bonding layer decrease in the order of C-C/W-Cu, C-C/Cr-Cu and C-C/Cu. Therefore, the shearing strength of the bonding layer increase with decreasing hardness. (3) By using a copper plate of 2-5 mm in thickness as a bonding layer between of C-C/Cr-Cu and C-C/W-Cu joints, shearing strength and thermal shock resistance temperature are improved to those of the C-C/Cu joint. Through thermal stress analysis, the thermal stress relief of the copper plate was confirmed. (author)

  14. Impact of Cooling Rate-Induced Recrystallization on High G Mechanical Shock and Thermal Cycling in Sn-Ag-Cu Solder Interconnects

    Science.gov (United States)

    Lee, Tae-Kyu; Bieler, Thomas R.; Kim, Choong-Un

    2016-01-01

    The mechanical stability and thermo-mechanical fatigue performance of solder joints with low silver content Sn-1.0Ag-0.5Cu (wt.%) (SAC105) alloy based on different cooling rates are investigated in high G level shock environment and thermal cycling conditions. The cooling rate-controlled samples ranging from 1°C/min to 75°C/min cooling rate, not only show differences in microstructure, where a fine poly-granular microstructure develops in the case of fast cooling versus normal cooling, but also show various shock performances based on the microstructure changes. The fast cooling rate improves the high G shock performance by over 90% compared to the normal cooled SAC105 alloy air-cooling environment commonly used after assembly reflow. The microstructure effect on thermal cycling performance is also discussed, which is analyzed based on the Sn grain orientation, interconnect stability, and solder joint bulk microstructure.

  15. Development of Ag-Cu-Zn-Sn brazing filler metals with a 1 0 weight-% reduction of silver and same liquidus temperature

    Institute of Scientific and Technical Information of China (English)

    Daniel Schnee; Gunther Wiehl; Sebastian Starck; Chen Kevin

    2014-01-01

    With BrazeTec BlueBraze the manufacturers in HVACR industry have an alternative filler metal with 10 weight-%less silver but same brazing temperatures.The performance of these new alloys has been evaluated in several tests.The evaluation included wetting investigations,metallographic examinations,joint strength at different temperatures and pulsation and corrosion resistance.The results ofthese tests will be presented in this paper.

  16. Good journalism or peace journalism?

    Directory of Open Access Journals (Sweden)

    David Loyn

    2007-10-01

    Full Text Available This paper argues against the prescriptive notions of Peace Journalism, and in particular its exclusive nature and attempt to define itself as a new orthodoxy. Most of the paper is a critique of the work of Jake Lynch and Annabel McGoldrick, in a book published in 2005, as well as their earlier Reporting the World series. They condemn all other ways of reporting as 'War Journalism, biased in favour of war.' I argue instead that the opposite of Peace Journalism is good journalism. Much of this Peace Journalism argument is derived from the work of Johan Galtung, who accuses 'war journalists' of reporting war in an enclosed space and time, with no context, concealing peace initiatives and making wars 'opaque/secret.' Galtung specifically calls on journalists as part of their mission to search out peace proposals which might begin as something small and beneath notice, but which might then be picked up and owned by politicians as their own. My response is clear and simple: creating peacemaking politicians is not the business of a reporter. I examine the traditional journalistic methods of using objectivity to get at a version of the truth. I concede that perfect truth is unattainable, (and paradoxically the tool of objectivity we use to get there is slippery too. I conclude that a more quotidian truth, or 'truthfulness' is though a manageable goal. I engage with philosophers who examine objectivity, concluding with the assistance of Thomas Nagel that it does still have a value. Nagel's account also has the merit of explaining how practices such as peace-reporting are bound to be less objective than alternatives, 'since they commit themselves to the adoption of particular perspectives, in effect giving up on the ideal of stripping away as much…as possible.' I examine the responses of the so-called 'journalism of attachment' framed as a desire of journalists faced by the horrors of Bosnia to cast off impartiality and emotional detachment and take

  17. Journal bearing

    Science.gov (United States)

    Menke, John R.; Boeker, Gilbert F.

    1976-05-11

    1. An improved journal bearing comprising in combination a non-rotatable cylindrical bearing member having a first bearing surface, a rotatable cylindrical bearing member having a confronting second bearing surface having a plurality of bearing elements, a source of lubricant adjacent said bearing elements for supplying lubricant thereto, each bearing element consisting of a pair of elongated relatively shallowly depressed surfaces lying in a cylindrical surface co-axial with the non-depressed surface and diverging from one another in the direction of rotation and obliquely arranged with respect to the axis of rotation of said rotatable member to cause a flow of lubricant longitudinally along said depressed surfaces from their distal ends toward their proximal ends as said bearing members are rotated relative to one another, each depressed surface subtending a radial angle of less than 360.degree., and means for rotating said rotatable bearing member to cause the lubricant to flow across and along said depressed surfaces, the flow of lubricant being impeded by the non-depressed portions of said second bearing surface to cause an increase in the lubricant pressure.

  18. Tin whisker growth from micro-alloyed SAC solders in corrosive climate

    Energy Technology Data Exchange (ETDEWEB)

    Illés, Balázs, E-mail: billes@ett.bme.hu [Department of Electronics Technology, Budapest University of Technology and Economics, Egry József St. 18, Budapest 1111 (Hungary); Horváth, Barbara [National Institute for Materials Science, 1-2-1 Sengen, Tsukuba 305-0047 (Japan)

    2014-12-15

    Highlights: • Lead-free micro-alloyed SAC solders can also develop tin whiskers. • The whiskering ability depends on the corrosion behavior of the SAC solders. • Copper and bismuth traces were found within the whiskers. • Copper and bismuth atoms can fragment the whisker grain. • The grain fragmentation can reduce the maximum length of the developed whiskers. - Abstract: In this paper the tin whisker growth properties of lead-free SAC (SnAgCu) solder alloys were investigated. There different alloys were studied: two micro-alloyed SAC (SnAgCu + Bi + Sb) and the widely applied SAC305 as reference. FR4 test board was developed for 0805 chip resistor components. Solder joints were fabricated on imm-Sn surface finish. The samples were aged in elevated temperature and different humidity levels to induce the tin whisker formation: at 85 °C/85RH% and 85 °C/20RH%. The test duration was 3000 h. Whisker growth was checked after every 500 h by scanning electron microscope. The developed whiskers were etched by focused ion beam and the cross-sections were observed by scanning ion microscope and transmission electron microscope. It was shown that the lead-free SAC solder alloys can also develop tin whiskers and the whiskering ability depends on the corrosion behavior of the SAC solders. Copper and bismuth precipitations were found at the whisker roots and within the whiskers which could effect on the number, length and type of the developed whiskers.

  19. Tin whisker growth from micro-alloyed SAC solders in corrosive climate

    International Nuclear Information System (INIS)

    Highlights: • Lead-free micro-alloyed SAC solders can also develop tin whiskers. • The whiskering ability depends on the corrosion behavior of the SAC solders. • Copper and bismuth traces were found within the whiskers. • Copper and bismuth atoms can fragment the whisker grain. • The grain fragmentation can reduce the maximum length of the developed whiskers. - Abstract: In this paper the tin whisker growth properties of lead-free SAC (SnAgCu) solder alloys were investigated. There different alloys were studied: two micro-alloyed SAC (SnAgCu + Bi + Sb) and the widely applied SAC305 as reference. FR4 test board was developed for 0805 chip resistor components. Solder joints were fabricated on imm-Sn surface finish. The samples were aged in elevated temperature and different humidity levels to induce the tin whisker formation: at 85 °C/85RH% and 85 °C/20RH%. The test duration was 3000 h. Whisker growth was checked after every 500 h by scanning electron microscope. The developed whiskers were etched by focused ion beam and the cross-sections were observed by scanning ion microscope and transmission electron microscope. It was shown that the lead-free SAC solder alloys can also develop tin whiskers and the whiskering ability depends on the corrosion behavior of the SAC solders. Copper and bismuth precipitations were found at the whisker roots and within the whiskers which could effect on the number, length and type of the developed whiskers

  20. Ag/CuO nanoparticles prepared from a novel trinuclear compound [Cu(Imdz)4(Ag(CN)2)2] (Imdz = imidazole) by a pyrolysis display excellent antimicrobial activity

    Science.gov (United States)

    Adhikary, Jaydeep; Das, Balaram; Chatterjee, Sourav; Dash, Sandeep Kumar; Chattopadhyay, Sourav; Roy, Somenath; Chen, Jeng-Wei; Chattopadhyay, Tanmay

    2016-06-01

    One copper and two silver containing one hetero tri-nuclear precursor compound [Cu(Imdz)4(Ag(CN)2)2] (1) (Imdz = Imidazole) has been synthesized and characterized by single crystal X-ray diffraction. Simple pyrolysis of the complex at 550 °C for 4 h afforded Ag/CuO nanoparticles (NPs). The synthesized nanoparticles were characterized by ultraviolet-visible (UV-Vis), Fourier transform infrared (FT-IR), X-ray powder diffraction (XRPD), dynamic light scattering (DLS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive X-ray (EDX) and X-ray photo electron spectroscopy (XPS). Staphylococcus aureus (S. aureus) and Escherichia coli (E. coli) have been employed as model microbial species to study the anti-microbial activity of the synthesized NPs. The NPs showed potent anti-microbial activity evidenced from the Minimum Inhibitory Concentration (MIC) and Minimum Bactericidal Concentration (MBC) values. Very high level of cell uptake and then generation of reactive oxygen species (ROS) are the origin of such strong antimicrobial activity for the NPs. However, the cytotoxicity level of the NPs towards normal human cell is very low.

  1. Particle temperature measurements in closed chamber detonations using thermoluminescence from Li2B4O7:Ag,Cu, MgB4O7:Dy,Li and CaSO4:Ce,Tb

    International Nuclear Information System (INIS)

    The present work describes the procedures and results from the first temperature measurements in closed chamber detonations obtained using the thermoluminescence (TL) of particles specifically developed for temperature sensing. Li2B4O7:Ag,Cu (LBO), MgB4O7:Dy,Li (MBO) and CaSO4:Ce,Tb (CSO) were tested separately in a total of 12 independent detonations using a closed detonation chamber at the Naval Surface Warfare Center, Indian Head Explosive Ordnance Disposal Technology Division (NSWC IHEODTD). Detonations were carried out using two different explosives: a high temperature plastic bonded explosive (HPBX) and a low temperature plastic bonded explosive (LPBX). The LPBX and HPBX charges produced temperatures experienced by the TL particles to be between ~550–670 K and ~700–780 K, respectively, depending on the shot. The measured temperatures were reproducible and typically higher than the thermocouple temperatures. These tests demonstrate the survivability of the TL materials and the ability to obtain temperature estimates in realistic conditions, indicating that TL may represent a reliable way of estimating the temperature experienced by free-flowing particles inside an opaque post-detonation fireball. - Highlights: • TL materials were tested in closed chamber detonations. • Temperatures experienced by the particles were ~550–670 K and ~700–780 K. • TL temperatures were reproducible and higher than thermocouple measurements. • Tests demonstrate TL material survival and ability to obtain temperature estimates

  2. Effect of Minor Alloying Elements on the Corrosion Behavior of Fe40Al in NaCl-KCl Molten Salts

    Directory of Open Access Journals (Sweden)

    G. Salinas

    2012-01-01

    Full Text Available The hot corrosion behavior of Fe40Al intermetallic alloyed with Ag, Cu, Li, and Ni (1–5 at.% in NaCl-KCl (1 : 1 M at 670°C, typical of waste gasification environments, has been evaluated by using polarization curves and weight loss techniques and compared with a 304-type stainless steel. Both gravimetric and electrochemical techniques showed that all different Fe40Al-base alloys have a much higher corrosion resistance than that for stainless steel. Among the different Fe40Al-based alloys, the corrosion rate was very similar among each other, but it was evident that the addition of Li decreased their corrosion rate whereas all the other elements increased it. Results have been explained in terms of the formation and stability of an external, protective Al2O3 layer.

  3. Dissimilar laser brazing of h-BN and WC-Co alloy in Ar atmosphere without evacuation process

    Science.gov (United States)

    Sechi, Y.; Nagatsuka, K.; Nakata, K.

    2012-08-01

    Laser brazing with Ti as an active element in Ag-Cu alloy braze metal has been successfully applied to dissimilar joining of h-BN and WC-Co alloy in Ar (99.999% purity) gas flow atmosphere without any evacuation process. Good wettability of the braze metal with h-BN and WC-Co alloy were confirmed by the observation and structural analysis of the interface by electron probe micro-analysis and scanning acoustic microscopy. The oxidation of titanium was not observed and this showed that the laser brazing with titanium as an active element in braze metal could be performed even in an Ar gas flow atmosphere without an evacuation process using a high-vacuum furnace.

  4. Journalism Education in Canada.

    Science.gov (United States)

    MacDonald, Dick; Russell, Catharine

    Twenty-four of the 35 Canadian schools with formal journalism programs responded to a survey conducted to collect data about enrollment, curricula, faculty background in journalism, and the ability of journalism graduates to find jobs in the profession. Highlights of the results are as follows: there are an estimated 3,300 journalism students in…

  5. From Journalism Studies to Journalism Theory

    Directory of Open Access Journals (Sweden)

    Elias Machado

    2005-06-01

    Full Text Available This paper comprises three parts –- 1 recognition of professional practice as a legitimate object of research; 2 development of methodologies that are adjusted to the particularities of the area; and 3 funding of multidisciplinary experiments on applied research. My intention here is to build on the mapping of existing studies to discuss some assumptions and to consolidate journalism as a fi eld of knowledge, based on the distinction between journalism studies and journalism theories.

  6. International Breastfeeding Journal: Introducing a new journal

    OpenAIRE

    Amir Lisa H

    2006-01-01

    Abstract International Breastfeeding Journal is a new open access peer-reviewed journal with a multidisciplinary focus. The aim of International Breastfeeding Journal is to contribute to understanding all aspects of breastfeeding. Breastfeeding is recognized as an important public health issue with enormous social and economic implications. In order to help women breastfeed successfully there is a need to understand both the physiology of lactation and the social and cultural context within w...

  7. CHINESE JOURNAL OF CHEMISTRY

    Institute of Scientific and Technical Information of China (English)

    2000-01-01

    @@Chinese Journal of Chemistry is an international journal published in English by the Chinese Chemical Society with its editorial office hosted by Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences.

  8. Has Communication Explained Journalism?

    Science.gov (United States)

    Zelizer, Barbie

    1993-01-01

    Argues for a more interdisciplinary approach to journalism scholarship to provide a fuller account of media power. Considers briefly the notions of performance, narrative, ritual, and interpretive community as alternative frames through which to consider journalism. (SR)

  9. eJournals verwalten

    OpenAIRE

    Bertelmann, Roland; Magee, Kirsten; Plieninger, Jürgen

    2004-01-01

    Erwerbung, Erschliessung, Verwaltung und Marketing von eJournals in Bibliotheken wird im Ablauf stichwortartig dargestellt. Acquisition, indexing, management and marketing of eJournals in libraries are shown as a checklist.

  10. Scientific Journalism in Armenia

    Science.gov (United States)

    Farmanyan, S. V.; Mickaelian, A. M.

    2015-07-01

    In the present study, the problems of scientific journalism and activities of Armenian science journalists are presented. Scientific journalism in the world, forms of its activities, Armenian Astronomical Society (ArAS) press-releases and their subjects, ArAS website "Mass Media News" section, annual and monthly calendars of astronomical events, and "Astghagitak" online journal are described. Most interesting astronomical subjects involved in scientific journalism, reasons for non-satisfactory science outreach and possible solutions are discussed.

  11. Data Journalism Grows Up

    OpenAIRE

    Hewett, J.

    2015-01-01

    Data journalism has evolved partly out of computer-assisted reporting (CAR) in the USA – bolstered by freedom of information (FoI), open data and journalism education. Jonathan Hewett traces the development and teaching of data journalism in the UK.

  12. New Economics Journals

    OpenAIRE

    Economics Bibliography, Journal of

    2015-01-01

    This list is consisted of the journals that entered to EconBib Index created by KSP. The list is updated with the each volume of JEB and incorporated the new added journals to EconBib. Please visit the official EconBib website www.econbib.org to see the contents of each journal. The journals, which may want to enter to the list and be indexed by EconBib, may find the conditions in EconBib website. “The register form” in the website should be submitted to the stated e-mail address. All journal...

  13. New Economics Journals

    OpenAIRE

    Economics Bibliography, Journal of

    2016-01-01

    This list is consisted of the journals that entered to EconBib Index created by KSP. The list is updated with the each volume of JEB and incorporated the new added journals to EconBib. Please visit the official EconBib website www.econbib.org to see the contents of each journal. The journals, which may want to enter to the list and be indexed by EconBib, may find the conditions in EconBib website. “The register form” in the website should be submitted to the stated e-mail address. All journal...

  14. International Breastfeeding Journal: Introducing a new journal

    Directory of Open Access Journals (Sweden)

    Amir Lisa H

    2006-03-01

    Full Text Available Abstract International Breastfeeding Journal is a new open access peer-reviewed journal with a multidisciplinary focus. The aim of International Breastfeeding Journal is to contribute to understanding all aspects of breastfeeding. Breastfeeding is recognized as an important public health issue with enormous social and economic implications. In order to help women breastfeed successfully there is a need to understand both the physiology of lactation and the social and cultural context within which breastfeeding occurs. International Breastfeeding Journal invites manuscripts from around the world, which address all of these aspects, including the impediments to breastfeeding, the health effects of not breastfeeding for infants and their mothers, and the management of breastfeeding problems.

  15. Gorilla journal : journal of Berggorilla- & Regenwald Direkthilfe

    OpenAIRE

    Berggorilla- & Regenwald-Direkthilfe e.V.

    1995-01-01

    Englische Ausgabe der Zeitschrift "Gorilla-Journal : Zeitschrift der Berggorilla- & Regenwald-Direkthilfe". Im Gorilla-Journal informieren wir unsere Mitglieder über die Aktivitäten des Vereins und berichten aus den Schutzprojekten, die wir unterstützen. Auch Aktionen unserer Mitglieder und Freunde werden vorgestellt. Außerdem enthält das Heft Artikel über Themen, die mit unserer Arbeit zusammenhängen.

  16. How to Rank Journals.

    Science.gov (United States)

    Bradshaw, Corey J A; Brook, Barry W

    2016-01-01

    There are now many methods available to assess the relative citation performance of peer-reviewed journals. Regardless of their individual faults and advantages, citation-based metrics are used by researchers to maximize the citation potential of their articles, and by employers to rank academic track records. The absolute value of any particular index is arguably meaningless unless compared to other journals, and different metrics result in divergent rankings. To provide a simple yet more objective way to rank journals within and among disciplines, we developed a κ-resampled composite journal rank incorporating five popular citation indices: Impact Factor, Immediacy Index, Source-Normalized Impact Per Paper, SCImago Journal Rank and Google 5-year h-index; this approach provides an index of relative rank uncertainty. We applied the approach to six sample sets of scientific journals from Ecology (n = 100 journals), Medicine (n = 100), Multidisciplinary (n = 50); Ecology + Multidisciplinary (n = 25), Obstetrics & Gynaecology (n = 25) and Marine Biology & Fisheries (n = 25). We then cross-compared the κ-resampled ranking for the Ecology + Multidisciplinary journal set to the results of a survey of 188 publishing ecologists who were asked to rank the same journals, and found a 0.68-0.84 Spearman's ρ correlation between the two rankings datasets. Our composite index approach therefore approximates relative journal reputation, at least for that discipline. Agglomerative and divisive clustering and multi-dimensional scaling techniques applied to the Ecology + Multidisciplinary journal set identified specific clusters of similarly ranked journals, with only Nature & Science separating out from the others. When comparing a selection of journals within or among disciplines, we recommend collecting multiple citation-based metrics for a sample of relevant and realistic journals to calculate the composite rankings and their relative uncertainty windows. PMID:26930052

  17. How to Rank Journals.

    Directory of Open Access Journals (Sweden)

    Corey J A Bradshaw

    Full Text Available There are now many methods available to assess the relative citation performance of peer-reviewed journals. Regardless of their individual faults and advantages, citation-based metrics are used by researchers to maximize the citation potential of their articles, and by employers to rank academic track records. The absolute value of any particular index is arguably meaningless unless compared to other journals, and different metrics result in divergent rankings. To provide a simple yet more objective way to rank journals within and among disciplines, we developed a κ-resampled composite journal rank incorporating five popular citation indices: Impact Factor, Immediacy Index, Source-Normalized Impact Per Paper, SCImago Journal Rank and Google 5-year h-index; this approach provides an index of relative rank uncertainty. We applied the approach to six sample sets of scientific journals from Ecology (n = 100 journals, Medicine (n = 100, Multidisciplinary (n = 50; Ecology + Multidisciplinary (n = 25, Obstetrics & Gynaecology (n = 25 and Marine Biology & Fisheries (n = 25. We then cross-compared the κ-resampled ranking for the Ecology + Multidisciplinary journal set to the results of a survey of 188 publishing ecologists who were asked to rank the same journals, and found a 0.68-0.84 Spearman's ρ correlation between the two rankings datasets. Our composite index approach therefore approximates relative journal reputation, at least for that discipline. Agglomerative and divisive clustering and multi-dimensional scaling techniques applied to the Ecology + Multidisciplinary journal set identified specific clusters of similarly ranked journals, with only Nature & Science separating out from the others. When comparing a selection of journals within or among disciplines, we recommend collecting multiple citation-based metrics for a sample of relevant and realistic journals to calculate the composite rankings and their relative uncertainty windows.

  18. Ranking economic history journals

    DEFF Research Database (Denmark)

    Di Vaio, Gianfranco; Weisdorf, Jacob Louis

    2010-01-01

    This study ranks-for the first time-12 international academic journals that have economic history as their main topic. The ranking is based on data collected for the year 2007. Journals are ranked using standard citation analysis where we adjust for age, size and self-citation of journals. We also...... compare the leading economic history journals with the leading journals in economics in order to measure the influence on economics of economic history, and vice versa. With a few exceptions, our results confirm the general idea about what economic history journals are the most influential for economic...... history, and that, although economic history is quite independent from economics as a whole, knowledge exchange between the two fields is indeed going on....

  19. Ranking Economic History Journals

    DEFF Research Database (Denmark)

    Di Vaio, Gianfranco; Weisdorf, Jacob Louis

    This study ranks - for the first time - 12 international academic journals that have economic history as their main topic. The ranking is based on data collected for the year 2007. Journals are ranked using standard citation analysis where we adjust for age, size and self-citation of journals. We...... also compare the leading economic history journals with the leading journals in economics in order to measure the influence on economics of economic history, and vice versa. With a few exceptions, our results confirm the general idea about what economic history journals are the most influential...... for economic history, and that, although economic history is quite independent from economics as a whole, knowledge exchange between the two fields is indeed going on....

  20. Artifacts in MRI of the temporomandibular joint caused by dental alloys: a phantom study at 1.5 T

    International Nuclear Information System (INIS)

    Purpose: The influence of dental alloys on MRI of the temporomandibular joint was studied using a phantom model for this joint. Methods: At 1,5 T, 15 dental alloys and 14 of their most important components were investigated acquiring sagittal (FOV: 150 mm) and transverse (FOV: 250 mm) T1-weighted SE additionally. The artifacts were assessed qualitatively as well as quantitatively, and the samples were subdivided into four artifact categories. Results: Ag, Cu, Ga, In, Ti, Sn, Zn, amalgan, the precious alloys, the Au-Pd and Ag-Pd alloys showed no artifacts (category I). Minimal artifacts below 10 mm on transverse images (category II) were found for Cr, Pd, Pt and for the Ni-Cr alloy. Mn and the remaining non-precious alloys induced artifacts up to 30 mm (category III). Significant artifacts - more than 30 mm - (category IV) were to be more susceptible for artifacts than T1-weighted SE and FLASH techniques. Conclusions: In contrast to dental alloys for fixed prosthodontics, Ni-Cr- or 18/8 wires used for orthodontic bands can influence not only the image quality, but also the diagnostic reliability of MRI of the temporomandibular joint. (orig.)

  1. Journal of Business Chemistry

    OpenAIRE

    2013-01-01

    The Journal of Business Chemistry examines issues associated with leadership and management for chemists and managers working in chemical research or industry. This journal is devoted to improving and developing the field of Business Chemistry. The Journal of Business Chemistry publishes peer-reviewed papers (including case studies) and essays. Areas for possible publication in include: leadership issues in the chemical and biochemical industry, such as teamwork, team building, mentoring, coa...

  2. About the Journal

    OpenAIRE

    Endri Papajorgji

    2015-01-01

    About the Journal Academic Journal of Business, Administration, Law and Social Sciences is an international peer-reviewed journal published three times a year by International Institute for Private, Commercial and Competition Law. The need for different approaches in science, such as in business, economics, law, administration and social sciences is a must in the whole field of scientific research. Academics, Professors, Researchers, Students and the whole world is in a new era of communicati...

  3. The Journal of Inflammation

    OpenAIRE

    Punchard Neville A; Whelan Cliff J; Adcock Ian

    2004-01-01

    Abstract Welcome to the Journal of Inflammation, the first open-access, peer-reviewed, online journal to focus on all aspects of the study of inflammation and inflammatory conditions. While research into inflammation has resulted in great progress in the latter half of the 20th century, the rate of progress is rapidly accelerating. Thus there is a need for a vehicle through which this very diverse research can be made readily available to the scientific community. The Journal of Inflammation,...

  4. Real inflation of journal prices: medical journals, U.S. journals, and Brandon list journals.

    OpenAIRE

    Kronenfeld, M R; Gable, S H

    1983-01-01

    Increases in price during the last twenty years were studied for the journals listed in the 1983 Brandon list, and during the last fifteen years for all medical journals and for U.S. periodicals overall. When compared with increases in the Consumer Price Index (CPI), prices in all three categories of publications have increased much more rapidly than have prices overall. Libraries whose journal-acquisition budgets increased merely at the same rate as the CPI during the periods examined today ...

  5. Rethinking Journalism Again

    DEFF Research Database (Denmark)

    . But does rehashing such familiar rationales bring journalism studies forward? Does it contribute to ongoing discussions surrounding journalism’s viability going forth? For all their seeming self-evidence, this book considers what bearing these old platitudes have in the new digital era. It asks...... whether such hopeful talk really reflects the concrete roles journalism now performs for people in their everyday lives. In essence, it poses questions that strike at the core of the idea of journalism itself. Is there a singular journalism that has one well-defined role in society? Is its public mandate...

  6. Journal of Vietnamese Environment

    OpenAIRE

    2012-01-01

    The Journal of Vietnamese Environment (J. Viet. Env.) plays the role of a scientific platform for researchers and stakeholders working on environmental issues in Vietnam and abroad. The journal is open for all kind of Vietnam-related environmental topics, from climate change and renewable energies to legislative framework and socio-economic aspects.

  7. Lifestyle Journalism: Blurring boundaries

    DEFF Research Database (Denmark)

    From, Unni

    2013-01-01

    Lifestyle journalism has experienced enormous growth in the media over the past two decades, but scholars in the fields of journalism and communication studies have so far paid relatively little attention to a field that is still sometimes seen as "not real journalism". There is now an urgent need......, social and cultural tensions within it. Taking a comparative view, the collection includes studies covering four continents, including countries such as Australia, China, Norway, Denmark, Singapore, the UK and the USA. While keeping the broader lifestyle field in mind, the chapters focus on a variety of...... sub-fields such as travel, music, food, health, fashion and personal technology journalism. This volume provides a fascinating account of the different facets of lifestyle journalism, and charts the way forward for a more sustained analysis of the field. This book was originally published as a special...

  8. Our Censored Journals

    Directory of Open Access Journals (Sweden)

    David Healy

    2008-01-01

    Full Text Available When an article is rejected by a medical journal, the standard assumption is that the article is unsound or there is something wrong with the author. Alternatively, it may have been because the journal editor was concerned about the consequences should the article be published. This article seeks to inform discussion by providing a series of instances in which editorial concerns about the consequences to journals may have counted for more than any assessment about the truth-value of the article or the motives of its authors. This claim is based on the fact that different journals may treat exactly the same article in an entirely different fashion; some issues appear to be taboo in certain journals, no matter who the author, and there is a series of explicit communications from editors that publication has been held up by their legal departments.

  9. Investigation of the Friction Behavior of the Zinc-Aluminum Based Commercial ZA-27 Journal Bearing

    OpenAIRE

    ÇUVALCI, Hamdullah

    2001-01-01

    The zinc-aluminum based ZA-27 alloy was produced by permanent mould casting. Using this alloy and bronze obtained from commercial sources, thin wall journal bearings were manufactured by machining. The friction behavior of the bearings was determined by testing the bearings in a journal bearing test machine under different operating conditions. The results show that the value of the friction factor of the bearings decreased with increasing bearing pressure. It was also observed t...

  10. Journal of CHINA PLASTICS

    Institute of Scientific and Technical Information of China (English)

    2012-01-01

    Journal of CHINA PLASTICS was authorized and approved by The State Committee of Science and Technology of China and The Bureau of News Press of China, and published by The China Plastics Processing Industry Association,Beijing Technology and Business University and The Institute of Plastics Processing and Application of Light Industry, distributed worldwide. Since its birth in 1987, CHINA PLASTICS has become a leading magazine in plastics industry in China, a national Chinese core journal and journal of Chinese scientific and technological article statistics. It is covered by CA.

  11. Computational Journalism. When journalism meets programming

    OpenAIRE

    Stavelin, Eirik

    2014-01-01

    Digital data sources and platforms allow journalists to produce news in new and different ways. The shift from an analog to digital workflow introduces computation as a central component of news production. This enables variability for end users, automation of tedious tasks for newsrooms, and allows journalists to tackle analysis of the increasingly large sets of data relevant to citizens. To journalism, computerization is a promising path for news production, particularly for ...

  12. US Marine Meteorological Journals

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — This series consists of volumes entitled 'Meteorological Journal' (a regulation Navy-issue publication) which were to be completed by masters of merchant vessels...

  13. In Other Professional Journals.

    Science.gov (United States)

    Campbell, Christine M.

    1992-01-01

    Lists current articles, appearing in major journals on language teaching and learning, applied psycholinguistics, linguistics, curriculum development, computer science, psychology, educational technology, and general education, of particular interest to foreign language instruction professionals. (CB)

  14. AJEMS - a new journal

    DEFF Research Database (Denmark)

    Kuada, John

    African Journal of Economic and Management Studies (AJEMS) provides an avenue for disseminating empirical research results, as well as theoretical viewpoints and methodologies that could impact positively on economic and business activities in Africa.......African Journal of Economic and Management Studies (AJEMS) provides an avenue for disseminating empirical research results, as well as theoretical viewpoints and methodologies that could impact positively on economic and business activities in Africa....

  15. Incentives for Journal Editors

    OpenAIRE

    Jinyoung Kim; Kanghyock Koh

    2014-01-01

    Scholars may become journal editors because editors may generate more citations of their own works. This paper empirically establishes that a scholar's publications are more likely to be cited by papers in a journal that is edited by the scholar. We then test if editors exercise influence on authors to cite editors papers by either pressuring authors (editorpressure hypothesis) or accepting articles with references to the editors papers (editorselection hypothesis), by using the keyword analy...

  16. Language Works. Linguistic Journal

    DEFF Research Database (Denmark)

    Thøgersen, Jacob; Hartling, Anna Sofie; Nørreby, Thomas Rørbeck;

    2016-01-01

    Language works! – and with this initiative and this journal we want to give the opportunity to many more students to present their linguistic research to each other, to the scientific community and to all interested.......Language works! – and with this initiative and this journal we want to give the opportunity to many more students to present their linguistic research to each other, to the scientific community and to all interested....

  17. Presentation of the journal.

    OpenAIRE

    Hernández, Esteban

    2004-01-01

    The recent upsurge in the volume and quality of the accounting history research in Spain has positioned it as one of the top nations in the field. However, only two Spanish journals are now dedicated entirely to accounting, and, while some Spanish accounting history researchers do publish part of their work in English language journals, publication continues to be a difficult proposition for most. Thus, many researchers can hope only to present their work as papers at Conferences and Congress...

  18. About the Journal

    OpenAIRE

    Endri Papajorgji

    2015-01-01

    Academic Journal of Business, Administration, Law and Social Sciences is an international peer-reviewed journal published three times a year by International Institute for Private, Commercial and Competition Law. The need for different approaches in science, such as in business, economics, law, administration and social sciences is a must in the whole field of scientific research. Academics, Professors, Researchers, Students and the whole world is in a new era of communication, which causes f...

  19. About the Journal

    OpenAIRE

    Endri Papajorgji

    2016-01-01

    Academic Journal of Business, Administration, Law and Social Sciences is an international peer-reviewed journal published three times a year by International Institute for Private, Commercial and Competition Law. The need for different approaches in science, such as in business, economics, law, administration and social sciences is a must in the whole field of scientific research. Academics, Professors, Researchers, Students and the whole world is in a new era of communication, which causes ...

  20. Journal of Proton Therapy

    OpenAIRE

    Editorial Office

    2015-01-01

    Journal of Proton Therapy (JPT) is an international open access, peer-reviewed journal, which publishes original research, technical reports, reviews, case reports, editorials, and other materials on proton therapy with focus on radiation oncology, medical physics, medical dosimetry, and radiation therapy.No article processing/submission feeNo publication feePeer-review completion within 3-6 weeksImmediate publication after the completion of final author proofreadDOI assignment for each publi...

  1. Microstructure and strength of brazed joints of TiB2 cermet to TiAl-based alloys

    Institute of Scientific and Technical Information of China (English)

    李卓然; 冯吉才; 曹健

    2003-01-01

    In this study, TiB2 cermet and TiAl-based alloy are vacuum brazed successfully by using Ag-Cu-Ti filler metal. The microstructural analyses indicate that two reaction products, Ti(Cu, Al)2 and Ag based solid solution (Ag(s.s)), are present in the brazing seam, and the interface structure of the brazed joint is TiB2/TiB2+ Ag(s.s) /Ag(s.s)+Ti(Cu, Al)2/Ti(Cu, Al)2/TiAl. The experimental results show that the shear strength of the brazed TiB2/TiAl joints decreases as the brazing time increases at a definite brazing temperature. When the joint is brazed at 1 223 K for 5 min, a joint strength up to 173 MPa is achieved.

  2. Ranking Law Journals and the Limits of Journal Citation Reports

    OpenAIRE

    Eisenberg, Theodore; Wells, Martin T.

    2013-01-01

    Rankings of schools, scholars, and journals emphasize ordinal rank. Journal rankings published by Journal Citation Reports (JCR) are widely used to assess research quality, which influences important decisions by academic departments, universities, and countries. We study refereed law journal rankings by JCR, Washington and Lee Law Library (W&L), and the Australian Research Council (ARC). Both JCR’s and W&L’s multiple measures of journals can be represented by a single latent factor. Yet JCR’...

  3. Arabic Electronic Journals in Librarianship : Evaluative Study

    OpenAIRE

    Ayman Sha'ban

    2007-01-01

    An evaluative study for 5 Arabic electronic journal on librarianship and information science, it apply a customized criteria for evaluation the e-journals, the selected journals were; Imformatics, Arabia 3000, Aren, Journal of King Fahd Library, and cybrarians journal.

  4. War Journalism and 'Objectivity'

    Directory of Open Access Journals (Sweden)

    Annabel McGoldrick

    2006-10-01

    Full Text Available This article opens by considering an apparent paradox. Many professional journalists, working on many media in many countries, consider themselves 'objective'. They do not, at least, set out to skew their coverage of important issues in favour of one side or the other. And yet much of their coverage of conflicts shows a discernible dominant pattern of War Journalism - biased in favour of war. This is not because of a lack of objectivity, the article suggests, but a surfeit. The set of conventions many editors and reporters regard as defining 'objective' journalism arose in response to economic and political conditions which rewarded news that could commend itself as unobjectionable to the maximum number of potential customers. Three of the most important conventions privilege official sources; a dualistic construction of stories and event, over process. Each of these, when applied to the representation of conflicts, leads readers and audiences - or leaves them - to over-value violent, reactive responses and under-value non-violent, developmental responses. Industry conventions sit uneasily alongside equally time-honoured expectations of journalism. These are encoded in rules and regulations governing the content of broadcast news, in many jurisdictions which have a public service concept for radio and television. In some respects, War Journalism can be shown to make it more difficult for broadcast news services to fulfil their public service obligations. Awareness is now growing, of the tension between these two pressures on journalism and its influence on the way pressing public debates are shaped and mediated. More Peace Journalism would help to bring public service news back into line with legitimate public expectations.

  5. Chinese Journalism Students

    DEFF Research Database (Denmark)

    Dombernowsky, Laura Møller

    2014-01-01

    As important providers of information, analysis of current events and debates, journalists are subject to high expectations regarding their professional values. Journalism is considered to be more than merely a career; it is construed as a profession that builds on personal commitment to serve...... society. This chapter is concerned with Chinese journalism students' self-perceptions and evaluations of journalistic performances in order to understand the professional values to which they adhere. The study is based on semi-structured in-depth interviews conducted in two periods in Spring 2011 and Fall...

  6. Journalism Pedagogical Framework Report

    DEFF Research Database (Denmark)

    Jørgensen, Asbjørn Slot

    design – the physical space for teaching integrated journalism skills - Collaboration: group size and group composition - Entrepreneur-ship and intrapreneur-ship – competitive and real-life - Social media: the new ethics. - Social media – professional profiles for journalists. - The journalism teachers...... report can serve as a catalogue of inspiration, including relevant tips and teaching material. Headlines from this report include: - Large cross-platform newsrooms of 70-80 students - External partnerships and university publications - Motivation and learning: the power of media related topics - Newsroom...

  7. The Apparent Contact Angle and Wetted Area of Active Alloys on Silicon Carbide as a Function of the Temperature and the Surface Roughness: A Multivariate Approach

    Science.gov (United States)

    Tillmann, Wolfgang; Pfeiffer, Jan; Wojarski, Lukas

    2015-08-01

    Despite the broad field of applications for active filler alloys for brazing ceramics, as well as intense research work on the wetting and spreading behavior of these alloys on ceramic surfaces within the last decades, the manufactured joints still exhibit significant variations in their properties due to the high sensitivity of the alloys to changing brazing conditions. This increases the need for investigations of the wetting and spreading behavior of filler alloys with regard to the dominating influences combined with their interdependencies, instead of solely focusing on single parameter investigations. In this regard, measurements of the wetting angle and area were conducted at solidified AgCuTi and CuSnTi alloys on SiC substrates. Based on these measurements, a regression model was generated, illustrating the influence of the brazing temperature, the roughness of the faying surfaces, the furnace atmosphere, and their interdependencies on the wetting and spreading behavior of the filler alloys. It was revealed that the behavior of the melts was significantly influenced by the varied brazing parameters, as well as by their interdependencies. This result was also predicted by the developed model and showed a high accuracy.

  8. The Journalism of Uncertainty.

    Science.gov (United States)

    Patterson, Joye

    1979-01-01

    Science journalism is in a period of change from its prior position of reporting the pronouncements of scientists to one of challenging the conclusions of scientists and using multiple sources to comment on scientific discovery. It is necessary that educational institutions anticipate the need for competent scientific journalists. (RE)

  9. Framing Journalism Education

    Science.gov (United States)

    Abusharif, Ibrahim N.

    2014-01-01

    Examining the growth, incentives, and progress of overseas campuses of major American educational institutions is an important academic pursuit. To have a complete picture, one must also consider the impact these branch campuses are having on the lives of their students. The Northwestern University in Qatar's journalism program was invited to…

  10. Existentialism in New Journalism.

    Science.gov (United States)

    Dalmia, Shikha

    In 1977, John C. Merrill, a mass communication scholar, found that many scholars believed that the sixties movement of new journalism is in some way related to existentialism. To find this out, a study identified six main themes of the philosophy of existentialism (as espoused by Jean-Paul Sartre) and looked for the presence of these themes in the…

  11. What are Journals for?

    Science.gov (United States)

    Rallison, S P

    2015-03-01

    'The secret is comprised in three words - work, finish, publish.' Michael Faraday There are many reasons doctors want to publish their work. For most at an early stage in their career, this may be to add a line to their curriculum vitae and advance their careers but for academics, publishing is an expectation. Many will believe they have something important to say, and wish to provoke debate and discussion; others wish to share knowledge and experiences, which in medicine can lead to a satisfying change in clinical practice. All serve to register one's idea and educate others. However, for some, the reason is as basic as money. As we celebrate the 350th anniversary of the first academic publication, perhaps we have come full circle when it comes to why people publish? Publishing is a flourishing business. There were approximately 28,100 active scholarly peer-reviewed journals in mid-2012, collectively publishing about 1.8-1.9 million articles per year. The number of articles published each year and the number of journals have both grown steadily for more than two centuries, by about 3% and 3.5% per year respectively. (1) Journals have a responsibility to refine and define information and act as a scientific filter. Many of us will receive daily invitations in our email inbox from eclectic and new journals that are likely to take anything - is the filter now too porous? But this industry is like any other commercial activity and the supply still far outstrips the demand. Perhaps the internet revolution has merely fuelled our hunger to publish more? The launch of this exciting and innovative series about publishing coincides with the 350th celebration of the publication of the first academic journal. In the age of social media, the first question is 'What are journals for?', which Simon Rallison sets out to answer. Simon is Director of Publications at the Physiological Society, and was previously a journal publisher with Earthscan, Springer and Blackwell. Writing is

  12. Positioning Open Access Journals in a LIS Journal Ranking

    Science.gov (United States)

    Xia, Jingfeng

    2012-01-01

    This research uses the h-index to rank the quality of library and information science journals between 2004 and 2008. Selected open access (OA) journals are included in the ranking to assess current OA development in support of scholarly communication. It is found that OA journals have gained momentum supporting high-quality research and…

  13. Linking Electronic Journals: Lessons from the Open Journal Project.

    Science.gov (United States)

    Hitchcock, Steve; Carr, Les; Hall, Wendy; Harris, Steve; Probets, Steve; Evans, David; Brailsford, David

    1998-01-01

    Describes the Open Journal project, funded by the United Kingdom Electronic Libraries (eLib) program. Discusses aspects of publishing being transformed by the World Wide Web; Open Journal demonstrators and linking features and types; user responses; building better open journals; and post-project application plans of publishers. (Author/AEF)

  14. Publishing corruption discussion: predatory journalism.

    Science.gov (United States)

    Jones, James W; McCullough, Laurence B

    2014-02-01

    Dr Spock is a brilliant young vascular surgeon who is up for tenure next year. He has been warned by the chair of surgery that he needs to increase his list of publications to assure passage. He has recently had a paper reviewed by one of the top journals in his specialty, Journal X-special, with several suggestions for revision. He received an e-mail request for manuscript submission from a newly minted, open access, Journal of Vascular Disease Therapy, which promises a quick and likely favorable response for a fee. What should be done? A. Send the paper to another peer reviewed journal with the suggested revisions. B. Resubmit the paper to Journal X-special. C. Submit to the online journal as is to save time. D. Submit to the online journal and another regular journal. E. Look for another job. PMID:24461869

  15. Meet the APS Journal Editors

    Science.gov (United States)

    2016-05-01

    The Editors of the APS journals invite you to join them for conversation. The Editors will be available to answer questions, hear your ideas, and discuss any comments about the journals. All are welcome. Light refreshments will be served.

  16. Electronic journals : Some recent projects

    OpenAIRE

    McKnight, Cliff

    1999-01-01

    The paper describes three recent electronic journal projects with which the author has been involved. The first, Project ELVYN, was a collaborative project with the Institute of Physics Publishing and involved the distribution of an electronic version of a journal to eight library test sites. These libraries then made the journal available to individual readers via the local area network. The second project, Cafe Jus, looked at electronic journal use with two groups of readers: taught postgra...

  17. International Journal of Circumpolar Health

    OpenAIRE

    Production, Co-Action Publishing

    2012-01-01

    Scope and purpose. The International Journal of Circumpolar Health is published by the International Association of Circumpolar Health Publishers. The journal follows the tradition initiated by its predecessor, Arctic Medical Research. The journal specializes in circumpolar health. It provides a forum for many disciplines, including the biomedical sciences, social sciences, and humanities as they relate to human health in high latitude environments. The journal has a particular interest in th...

  18. Journal of Spatial Information Science

    OpenAIRE

    Nedjeljko Frančula

    2011-01-01

    The Journal of Spatial Information Science (JoSIS) is a new international interdisciplinary journal with open access dedicated to publishing original research and review papers related to spatial information science. Themes of the journal include computer geometry, geocomputation, spatial algorithms, geovisualization, cartography, spatial data models, web GIS, spatial databases, and location based services.

  19. Evaluation of OAS Education Journals.

    Science.gov (United States)

    Leavitt, Howard B.; And Others

    An in-depth evaluation of four Organization of American States educational journals is presented. The journals, published for distribution among Latin American countries, were "Tecnologia Educativa", "Curriculum", "Educacion de Adultors", and "La Educacion". Assessment was made of the journals' mandates, implementation procedures, and managerial…

  20. Monopoly Power and Electronic Journals.

    Science.gov (United States)

    Meyer, Richard W.

    1997-01-01

    Rising periodical prices and lagging library budgets have many academics hoping that scholarly print journals will migrate to online versions. Examines economic factors shaping the electronic journal market, emerging new electronic journals, access versus ownership, consortial purchasing, self-maintained infrastructures, elimination of tenure and…

  1. Decoupling the scholarly journal

    OpenAIRE

    Jason ePriem; Bradley H. Hemminger

    2012-01-01

    Although many observers have advocated the reform of the scholarly publishing system, improvementsto functions like peer review have been adopted sluggishly. We argue that this is due to the tightcoupling of the journal system: the system's essential functions of archiving, registration,dissemination, and certification are bundled together and siloed into tens of thousands of individualjournals. This tight coupling makes it difficult to change any one aspect of the system, choking outinnovati...

  2. Journal Update : issue 1

    OpenAIRE

    Malta Medical Journal Club

    2014-01-01

    Contents: Letter from the editors - Thomas Borg Barthet and Dale Brincat; Message for Journal Update - Gilbert Gravino and Gianluca Gonzi; Anemia, an independent predictive factor for amputation and mortality in patients hospitalized for peripheral artery disease - Thomas Borg Barthet; Peripheral blood lymphocyte telomere length as a predictor of response to immunosuppressive therapy in childhood aplastic anaemia - Thomas Borg Barthet; Influenza vaccination of pregnant women and pro...

  3. Electronic books and journals

    OpenAIRE

    Endres, A.

    1996-01-01

    Electronic books and journals are both desirable and feasible. From a user's point of view they solve some shortcomings of conventional media, but more important are the new opportunities they open. To exploit those, a number of technical challenges have to be addressed. Besides, a series of business and organisational issues have to be taken care of. The German project MeDoc had to cope with a subset of these questions and found pragmatic answers. Libraries and librarians are well adviced to...

  4. Students’ Learning through Reflective Journaling

    Directory of Open Access Journals (Sweden)

    Alvyda Liuolienė

    2011-04-01

    Full Text Available The aim of the article is to get acquainted with the types of journals used in education to help students to learn. The paper presents some ways of fostering student’s learning through reflective journaling. It also describes the key aspects of a new method ARRIVE cycle in connection with teachers preparation to use reflective journals in a classroom. The article also presents self-assessment in reflective journaling and students’ need to self-evaluate their learning process. Reflective journaling as central to students’ self-evaluation is described as a means of fostering metacognition.

  5. Scientific Journal Indexing

    Directory of Open Access Journals (Sweden)

    Getulio Teixeira Batista

    2007-08-01

    Full Text Available It is quite impressive the visibility of online publishing compared to offline. Lawrence (2001 computed the percentage increase across 1,494 venues containing at least five offline and five online articles. Results shown an average of 336% more citations to online articles compared to offline articles published in the same venue. If articles published in the same venue are of similar quality, then they concluded that online articles are more highly cited because of their easier access. Thomson Scientific, traditionally concerned with printed journals, announced on November 28, 2005, the launch of Web Citation Index™, the multidisciplinary citation index of scholarly content from institutional and subject-based repositories (http://scientific.thomson. com/press/2005/8298416/. The Web Citation Index from the abstracting and indexing (A&I connects together pre-print articles, institutional repositories and open access (OA journals (Chillingworth, 2005. Basically all research funds are government granted funds, tax payer’s supported and therefore, results should be made freely available to the community. Free online availability facilitates access to research findings, maximizes interaction among research groups, and optimizes efforts and research funds efficiency. Therefore, Ambi-Água is committed to provide free access to its articles. An important aspect of Ambi-Água is the publication and management system of this journal. It uses the Electronic System for Journal Publishing (SEER - http://www.ibict.br/secao.php?cat=SEER. This system was translated and customized by the Brazilian Institute for Science and Technology Information (IBICT based on the software developed by the Public Knowledge Project (Open Journal Systems of the British Columbia University (http://pkp.sfu.ca/ojs/. The big advantage of using this system is that it is compatible with the OAI-PMH protocol for metadata harvesting what greatly promotes published articles

  6. Wear Behaviour of Zinc-Aluminium Alloys and the Bearings Produced from these Alloys

    OpenAIRE

    SAVAŞKAN, Temel; PÜRÇEK, Gençağa

    2000-01-01

    In this study, two ternary zinc-aluminum-copper and two quaternary zinc-aluminum-copper-silicon alloys were produced by permanent mould casting. The wear behaviour of these alloys were investigated with a pin-on-disc machine The wear behaviour of the journal bearings produced from these alloys was investigated with a bearing test rig. The wear resistance of zinc-aluminum based alloys was found to be higher than that of CuSn12 bronze. ın addition, the bearings produced from the zinc-...

  7. The handbook of journal publishing

    CERN Document Server

    Morris, Sally; LaFrenier, Douglas; Reich, Margaret

    2013-01-01

    The Handbook of Journal Publishing is a comprehensive reference work written by experienced professionals, covering all aspects of journal publishing, both online and in print. Journals are crucial to scholarly communication, but changes in recent years in the way journals are produced, financed, and used make this an especially turbulent and challenging time for journal publishers - and for authors, readers, and librarians. The Handbook offers a thorough guide to the journal publishing process, from editing and production through marketing, sales, and fulfilment, with chapters on management, finances, metrics, copyright, and ethical issues. It provides a wealth of practical tools, including checklists, sample documents, worked examples, alternative scenarios, and extensive lists of resources, which readers can use in their day-to-day work. Between them, the authors have been involved in every aspect of journal publishing over several decades and bring to the text their experience working for a wide range of ...

  8. Five Predatory Mega-Journals: A Review

    OpenAIRE

    Beall, Jeffrey

    2013-01-01

    Mega-journals such as PLOS One are an emerging and successful model of scholarly Open Access publishing. Unfortunately, some new, questionable journals have appeared that are copying the megajournal model. This review covers the five predatory mega-journals British Journal of Science, International Journal of Current Research, International Journal of Science and Advanced Technology (IJSAT), International Journal of Sciences (IJSciences), and World Journal of Science and Technology. Each of t...

  9. New NAS journal

    Science.gov (United States)

    In April 1984 the National Academy of Sciences (NAS) will begin publishing a new quarterly focusing on science policy. Written primarily for legislators, diplomats, corporate managers, security analysts, and other public policy analysts, the new journal will deal with such diverse topics as arms control, economic competition, social change, and health care.Original articles are expected to create a 120-page periodical that will discuss policy issues on a sophisticated but nonspecialist level, in a manner similar to that which Foreign Affairs uses to discuss U.S. foreign policy topics, according to NAS.

  10. NEW YEAR, NEW JOURNAL

    Institute of Scientific and Technical Information of China (English)

    Zunqi; Lin

    2013-01-01

    <正>We are excited to release the first issue of High Power Laser Science and Engineering(abbreviated HPLaser)at the beginning of 2013,Year of the Snake in the Chinese calendar.First of all,I would like to give our sincere thanks to those who have contributed to the publishing of the new journal.Since the invention of laser in 1960,the requirements of scientific research have driven the development of high power laser technology.Laser output power continues to increase dramatically through the development of laser technology,and many new research topics are being discovered and created.

  11. Citizen Journalism & Public Interfaces

    DEFF Research Database (Denmark)

    Brynskov, Martin; Strøbech, Kristian; Bang, Jørgen

    2011-01-01

    of views or plain information dissemination. Form the media institution’s point of view the goal was to create a platform for hyper local journalism as a source for journalistic coverage in commercial media. The group investigating civic communication within the Digital Urban Living project follo...... as digital providers of their own activities. In the paper we present our findings and reflect them in relation to the design of the web-portal and the profile of the users. Finally we discuss the further perspectives of this form of user/citizens involvement in public communication....

  12. Journal of Maps

    Directory of Open Access Journals (Sweden)

    Nedjeljko Frančula

    2009-12-01

    Full Text Available Journal of Maps (JoM (http://www.journalofmaps.com počeo je izlaziti 2005. godine isključivo kao elektronički časopis. Izdavač je School of Earth Sciences and Geography, Kingston University, UK. Budući da ne izlazi u tiskanom izdanju, časopis nema uobičajene sveske. Svescima se, ipak, mogu smatrati članci srodne tematike koji se objavljuju tri puta godišnje – u travnju, kolovozu i prosincu.

  13. Comparing the hydrology journals

    Science.gov (United States)

    McDonnell, Jeff

    How do the various water resources journals stack up? This question is frequently asked at scientific meetings, within promotion and tenure committees, and around graduate student lunch counters. Several years ago G. Dagan (Eos, June 20,1989) published a very useful report of findings by the Institute for Scientific Information (ISI), which publishes annual reviews of scientometric indices. I read his report just after receiving my Ph.D., and the numbers greatly influenced my choice of where to publish my dissertation. For those graduate students and water resources professionals who may benefit from the latest figures, I report my compilation of the 1995 impact factors from ISI.

  14. A Single Journal Study : Malaysian Journal of Computer Science

    OpenAIRE

    Zainab, A.N.; Anyi, K. W. U.; Anuar, N. B.

    2013-01-01

    Single journal studies are reviewed and measures used in the studies are highlighted. The following quantitative measures are used to study 272 articles published in Malaysian Journal of Computer Science, (1) the article productivity of the journal from 1985 to 2007, (2) the observed and expected authorship productivity tested using Lotka's Law of author productivity, identification and listing of core authors; (3) the authorship, co-authorship pattern by authors' country of origin and instit...

  15. Characteristics of dissimilar laser-brazed joints of isotropic graphite to WC-Co alloy

    Energy Technology Data Exchange (ETDEWEB)

    Nagatsuka, Kimiaki, E-mail: nagatuka@jwri.osaka-u.ac.jp [Graduate School of Engineering, Osaka University, Joining and Welding Research Institute, 11-1, Mihogaoka, Ibaraki, Osaka 567-0047 (Japan); Sechi, Yoshihisa, E-mail: sechi@kagoshima-it.go.jp [Kagoshima Prefectural Institute of Industrial Technology, 1445-1 Oda, Hayato-cho, Kirishima, Kagoshima 899-5105 (Japan); Miyamoto, Yoshinari, E-mail: y_miyamoto@toyotanso.co.jp [Toyo Tanso Co., Ltd., 5-7-12 Takeshima, Nishiyodgawa-ku, Osaka 555-0011 (Japan); Nakata, Kazuhiro, E-mail: nakata@jwri.osaka-u.ac.jp [Joining and Welding Research Institute, Osaka University, 11-1, Mihogaoka, Ibaraki, Osaka 567-0047 (Japan)

    2012-04-25

    Highlights: Black-Right-Pointing-Pointer Ti was required in the filler metal for brazing graphite to WC-Co alloy. Black-Right-Pointing-Pointer The shear strength of the joint increased with Ti content up to 1.7 mass%. Black-Right-Pointing-Pointer Ti concentrated at the interface of graphite/filler metal. Black-Right-Pointing-Pointer TiC was formed at the interface of graphite/filler metal. - Abstract: The effect of Ti serving as an activator in a eutectic Ag-Cu alloy filler metal in dissimilar laser-brazed joints of isotropic graphite and a WC-Co alloy on the joint strength and the interface structure of the joint is investigated in this study. To evaluate the joint characteristics, the Ti content in the filler metal was increased from 0 to 2.8 mass%. The laser brazing was carried out by irradiating a laser beam selectively on the WC-Co alloy plate in Ar atmosphere. The threshold content of Ti required to join isotropic graphite to WC-Co alloy was 0.4 mass%. The shear strength at the brazed joint increased rapidly with increasing Ti content up to 1.7 mass%, and a higher Ti content was found to be likely to saturate the shear strength to a constant value of about 14 MPa. The isotropic graphite blocks also fractured at this content. The concentration of Ti observed at the interface between isotropic graphite and the filler metal indicates the formation of an intermetallic layer of TiC.

  16. A profession termed Journalism

    Directory of Open Access Journals (Sweden)

    Manuel Fernández Areal, Ph. D.

    2010-01-01

    Full Text Available New technologies can foster the impression that journalism, as a profession will become extinct probably in a short term. Anybody can have access to any information sources as well as to transmit – through Internet- all sorts of messages at an unusual speed, and this fact seems to support the idea that no technical training will be needed in the future not even an specific cultural background will be required, much less an university degree or qualification that ensures a responsible and appropriate practice of the modern social communication. The Federation of Journalists Associations in Spain (FAPE in its Draft of the Professional Statute is in favor of a graduated or qualified profession at an university level, and its Commission for Complaints has been developing a successful work regarding the professional self-regulation and self-control for the benefit of society. Therefore, there are good reasons for being optimist. Journalism, as a profession, is not going to disappear, and maybe it is time to consider it, really, as an academic qualified profession.

  17. WHAT TO DO ABOUT JOURNALISM?

    Directory of Open Access Journals (Sweden)

    Barbie Zelizer

    2015-08-01

    Full Text Available I begin with a question that may seem to be labor the point to readers of this article but which I believe holds some of the key issues associated with contemporary journalism.“What to do about journalism?” is a question that has not only conceptual dimensions – as in what do we study when we think about journalism -- but also pedagogic ones -- how do we teach what we think we know – and, most importantly, pragmatic ones – what is journalism today? And how will we continue practicing it into the coming era? on this article I would like to think through some of the most important challenges facing the study of contemporary journalism. I’ll be drawing from my own work that has been somewhat focused on the fundamental question of what journalism is for.

  18. Particle temperature measurements in closed chamber detonations using thermoluminescence from Li{sub 2}B{sub 4}O{sub 7}:Ag,Cu, MgB{sub 4}O{sub 7}:Dy,Li and CaSO{sub 4}:Ce,Tb

    Energy Technology Data Exchange (ETDEWEB)

    Yukihara, E.G., E-mail: eduardo.yukihara@okstate.edu [Physics Department, Oklahoma State University, 145 Physical Sciences, Stillwater, OK 74078 (United States); Coleman, A.C.; Bastani, S.; Gustafson, T. [Physics Department, Oklahoma State University, 145 Physical Sciences, Stillwater, OK 74078 (United States); Talghader, J.J. [Department of Electrical and Computer Engineering, University of Minnesota, Minneapolis, MN 55455 (United States); Daniels, A.; Stamatis, D.; Lightstone, J. M; Milby, C.; Svingala, F.R. [Naval Surface Warfare Center, Indian Head Explosive Ordnance Disposal Technology Division (NSWC IHEODTD), Indian Head, MD 20640 (United States)

    2015-09-15

    The present work describes the procedures and results from the first temperature measurements in closed chamber detonations obtained using the thermoluminescence (TL) of particles specifically developed for temperature sensing. Li{sub 2}B{sub 4}O{sub 7}:Ag,Cu (LBO), MgB{sub 4}O{sub 7}:Dy,Li (MBO) and CaSO{sub 4}:Ce,Tb (CSO) were tested separately in a total of 12 independent detonations using a closed detonation chamber at the Naval Surface Warfare Center, Indian Head Explosive Ordnance Disposal Technology Division (NSWC IHEODTD). Detonations were carried out using two different explosives: a high temperature plastic bonded explosive (HPBX) and a low temperature plastic bonded explosive (LPBX). The LPBX and HPBX charges produced temperatures experienced by the TL particles to be between ~550–670 K and ~700–780 K, respectively, depending on the shot. The measured temperatures were reproducible and typically higher than the thermocouple temperatures. These tests demonstrate the survivability of the TL materials and the ability to obtain temperature estimates in realistic conditions, indicating that TL may represent a reliable way of estimating the temperature experienced by free-flowing particles inside an opaque post-detonation fireball. - Highlights: • TL materials were tested in closed chamber detonations. • Temperatures experienced by the particles were ~550–670 K and ~700–780 K. • TL temperatures were reproducible and higher than thermocouple measurements. • Tests demonstrate TL material survival and ability to obtain temperature estimates.

  19. Colonialism and Journalism in Ireland

    OpenAIRE

    Foley, Michael

    2004-01-01

    Irish journalism developed during the 19th century at a time of tremendous change. While journalists were involved in the debates about nationalism, both as commentators and in many cases activists, they also developed a journalism practice that corresponded to the professional norms of journalists in Britain and the United States. It would appear that the middle-class nature of Irish journalists meant there was a dual pressure towards professionalising journalism and fighting for legislative...

  20. International Journal of Innovation - IJI

    OpenAIRE

    International Journal of Innovation; Altieres de Oliveira Silva

    2015-01-01

    For long, we have noticed the interest on a publishing vehicle of the international community of academics and practitioners on innovation, to support intellectual production in this field. The International Journal of Innovation (IJI Journal) comes out as a result of efforts of researchers linked to distinct nuclei and research/studying groups in Universities around the world. It is an academic publication vehicle on innovation at large. IJI Journal comes out to support scientific r...

  1. Medical Journalism and Emergency Medicine

    OpenAIRE

    Saeed Safari; Alireza Baratloo; Mahmoud Yousefifard

    2015-01-01

    Nowadays, many researches in the field of medicine are conducting all around the world and medical journalism is a way to share the results. In fact, dissemination of the related manuscripts can prevent the repetitive research or may even lead to conducting a better survey. Therefore high quality medical journals are considered as up-to-date resources for further investigations. Medical journals are propagating their papers in various media including television programs, newspapers, internet ...

  2. WHAT TO DO ABOUT JOURNALISM?

    OpenAIRE

    Barbie Zelizer

    2015-01-01

    I begin with a question that may seem to be labor the point to readers of this article but which I believe holds some of the key issues associated with contemporary journalism.“What to do about journalism?” is a question that has not only conceptual dimensions – as in what do we study when we think about journalism -- but also pedagogic ones -- how do we teach what we think we know – and, most importantly, pragmatic ones – what is journalism today? And how will we continue practicing it into ...

  3. CREATION OF SCIENTIFIC JOURNAL REPOSITORY BASED ON OPEN JOURNAL SYSTEMS

    OpenAIRE

    Іванкевич, О. В.; Національний авіаційний університет; Вахнован, В. Ю.; Національний авіаційний університет

    2012-01-01

     The main features, characteristics and advantages of the open access database “Open Journal Systems” are considered. Demonstrated role of an electronic journal in promotion of the research activity and revealed the advantages of open access, through which expands readership and increases the number of citations of scientific papers.

  4. Good journalism or peace journalism? – Counterplea by David Loyn

    Directory of Open Access Journals (Sweden)

    David Loyn

    2007-10-01

    Full Text Available In this paper the author responds to the reasoning by Jake Lynch (“Peace journalism and its discontents” and Samuel Peleg (“In defense of peace journalism: A rejoinder”, published in the same issue of conflict & communication online (http://www.cco.regener-online.de/2007_2/inhalt6_2.htm.

  5. Journalism we don’t teach at journalism schools

    NARCIS (Netherlands)

    Bakker, Piet

    2013-01-01

    Although basic features of journalism have remained the same over the last decades, the tasks journalists perform, the skills they need and the position they have within news organizations have changed dramatically. Usually the focus in the discourse on changes in journalism is on skills, especially

  6. Teaching journalism or teaching African journalism? Experiences from foreign involvement in a journalism programme in Ethiopia

    OpenAIRE

    Skjerdal, Terje S

    2011-01-01

    Journalism programmes across the African continent have different attitudes to the issue of universal vs.
    local values in journalism. This article discusses the issue in light of a post-graduate journalism
    programme that opened at Addis Ababa University in 2004. In its 5-year implementation phase, the
    programme engaged educators from Europe and North America in addition to local instructors. Thus, one
    could expect a potential conflict between Wester...

  7. Scientific journal cancellations

    CERN Multimedia

    The Library

    2001-01-01

    Earlier this year the Scientific Information Policy Board (SIPB) requested the Library and the Working Group for Acquisitions to revise the current printed journal collection in order to cancel those titles that are less required. Savings could then be used for the development of other collections and particularly electronic resources needed to support CERN current research activities. A list of proposed cancellations was drawn and posted on the Library web pages: http://library.cern.ch/library_general/cancel.html The SIPB invites every one to check if any of the titles are of importance to their work, in which case you are invited to inform the Library before the 25th of September by sending an e-mail to: eliane.chaney@cern.ch Titles not reconsidered by the users will be cancelled by the end of the year. Thank you, The Library

  8. Journalism of Relation

    DEFF Research Database (Denmark)

    Blaagaard, Bolette

    -defined as theory and practice of production of cultural memory and social imaginaries of gendered, ethnic, religious, national and ‘racial’ differences. At the core of the argument here is a critique of the journalistic use of ‘objectivity’. This use hides the journalistic subjectivity by splitting the...... phenomenological approach to difference, perception should not be understood as interchangeable with visualisation. It is rather an understanding that creates strong ties to consciousness and experience. Drawing in the whole of personal experience and consciousness of difference phenomenology presents a theory of...... the self-other relation which is simultaneously personal and political. Secondly, the dissertation relates the phenomenological ‘race’ and gender debates to the societal and productive context of contemporary European and ‘western’ globalised and mediated culture and politics. Journalism is re...

  9. Situating peace journalism in journalism studies: A critical appraisal

    Directory of Open Access Journals (Sweden)

    Thomas Hanitzsch

    2007-10-01

    Full Text Available Most wars were not brought to our attention if there were no journalists to report on them and no news media to send reporters to conflict spots. At the same time, the media often give priority to conflict and war at the expense of playing a positive role in attempts to bring about peace. The concept of peace journalism is, therefore, seen as an alternative model to traditional ways of war reporting. This article argues, however, that the idea of peace journalism comes as old wine in new bottles. Although carrying a noble goal, it ignores the manifold nuances in the media and tends to highlight the exceptional, spectacular and negative of war coverage. The idea of peace journalism tends to overestimate the influence journalists and the media have on political decisions; and it often understands audiences in terms of a passive mass that needs to be enlightened by virtue of peace reporting. In addition to this, peace journalism is, to a considerable extent, based on an overly individualistic perspective and ignores the many structural constraints that shape and limit the work of journalists: few personnel, time and material resources; editorial procedures and hierarchies; textual constraints; availability of sources; access to the scene and information in general - just to name a few. All this suggests that the conduct of peace journalism is not a matter of individual leeway, and media structures and professional routines cannot be modified from the position of the individual journalist. Modern corporate journalism involves processes of organized news production, thus giving priority to organizational and institutional factors as well as processes of professional socialization. To have any impact on the way the news is made, and its critical scrutiny, the advocates of peace journalism must address the structural constraints of news production. The discussion of peace journalism, and particularly of its practical implications, must be tied to the

  10. Cu-Au-Ag alloy nanoparticles incorporated silica films using a new three-layer deposition technique.

    Science.gov (United States)

    Pal, Sudipto; Bysakh, Sandip; De, Goutam

    2010-02-01

    Formation of Au-Ag-Cu ternary alloy nanoparticles (NPs) is difficult mainly because the system Cu/Ag is immiscible. We present a new synthetic technique to generate such ternary alloy NPs in silica film matrix employing a three-layer (3L) coating design. In this methodology three successive coating layers were deposited on silica glass substrates from separately prepared Cu-, Au- and Ag-ion incorporated inorganic-organic hybrid silica sols by dipping method. The Au layer is kept in the middle because it is miscible with both the Ag and Cu. The 3L film assembly was subjected to UV- and heat-treatment at 450-750 degrees C in H2-N2 atmosphere. UV-treatment generates small Au and Ag NPs in the respective layers and Cu remains as Cu2+; subsequent heat-treatment in H2-N2 induces the formation of ternary alloy NPs by the interlayer diffusion of nanometals. The final heat-treated film (750 degrees C/H2-N2) shows single and sharp plasmon band centered at 480 nm in the UV-visible spectrum indicating the formation of alloy (solid solution) NPs. GIXRD study shows one set of diffraction peaks which are shifted towards higher angle with respect to the Au or Ag diffraction peaks. FESEM, GIXRD, HRTEM, and SAED analyses reveal that the alloy has a composition close to (Au + Ag)0.88Cu0.12. The EDS analyses using the nano probe attached with TEM confirm the presence of Au, Ag and Cu in all the alloy NPs. PMID:20352717

  11. Local Evaluation of Chemistry Journals

    Science.gov (United States)

    Kraus, Joseph R.; Hansen, Rachel

    2008-01-01

    This paper reports on the evaluation of local usage statistics of a specific set of chemistry journals at the University of Denver in Colorado, USA. The objective of the study is to demonstrate that commercial publishers in chemistry charge considerably more for their journals than those from the non-commercial sector. There are three variables…

  12. Medical Journalism and Emergency Medicine

    Directory of Open Access Journals (Sweden)

    Saeed Safari

    2015-07-01

    Full Text Available Nowadays, many researches in the field of medicine are conducting all around the world and medical journalism is a way to share the results. In fact, dissemination of the related manuscripts can prevent the repetitive research or may even lead to conducting a better survey. Therefore high quality medical journals are considered as up-to-date resources for further investigations. Medical journals are propagating their papers in various media including television programs, newspapers, internet websites and different social media. So they can influence the government policy makers, health-care professionals and even public. Moreover, most researchers hear about medical discoveries for the first time through medical journals and their related social media. So as well a high quality journal can help to improve medical science, a journal of poor quality can be damaging and distorting. Indeed, popular journals have the power of inventing a “communication storm” to draw attention to a certain topic. Thus they have to respect the accepted international principles to prevent spreading inaccurate and misleading data. This paper aims to review the previous and current situation of medical journalism by focus on field of emergency medicine.

  13. Let Us Rank Journalism Programs

    Science.gov (United States)

    Weber, Joseph

    2014-01-01

    Unlike law, business, and medical schools, as well as universities in general, journalism schools and journalism programs have rarely been ranked. Publishers such as "U.S. News & World Report," "Forbes," "Bloomberg Businessweek," and "Washington Monthly" do not pay them much mind. What is the best…

  14. Astronomy & Astrophysics: an international journal

    Science.gov (United States)

    Bertout, C.

    2011-07-01

    After a brief historical introduction, we review the scope, editorial process, and production organization of A&A, one of the leading journals worldwide dedicated to publishing the results of astrophysical research. We then briefly discuss the economic model of the Journal and some current issues in scientific publishing.

  15. Journal of Flood Risk Management

    OpenAIRE

    Nedjeljko Frančula

    2011-01-01

    The Journal of Flood Risk Management is dedicated to knowledge exchange in all fields related to flood risk. It is intended to hydrologists, meteorologists, geographers, geomorphologists, conservators, civil engineers, sociologists, etc. The journal was initiated by Chartered Institution of Water and Environmental Management and Wiley-Blackwell. It has been published in four volumes per year since 2008.

  16. Journalism as Cultures of Circulation

    DEFF Research Database (Denmark)

    Bødker, Henrik

    2013-01-01

    The universe of journalism has always consisted of interspersed texts, meanings and practices. Yet, much journalism research has often isolated either texts and/or contexts and as such assumed relations between professional practices, informed (rational) readers and (conceived) core texts...... of journalism. It is, however, more important than ever to shift attention away from texts to the processes through which they are circulated. This is partly because the many cultural forms of journalism (textual, institutional, technological, material, behavioural and imagined) are undergoing significant......, likes, comments, searches, journalist roles, writing and reading positions and identities etc. Such forms will be traced within the mediation of a specific event with the overall aim of beginning a theorization of the landscape of journalism as highly interrelated cultures of circulation....

  17. Journal information flow in nanotechnology

    International Nuclear Information System (INIS)

    The nanotechnology development is accompanied by an intensive growth of information flow which is specially noticeable as applied to journal information flow. Now over the world there are the 69 nano-titled journals with the impact factor and/or a settled periodicity as well as the 70 those which lack stability periodicity and are in an organization stage. Only 49 nano-titled have the impact factor with the comparatively high mean value of about 3.44. The domestic nano-titled journals published in Russia, India, China, and other countries are also considered. The attention is taken that in the 2006–2010 period the 95 new nano-titled journals were organized and in 2011 this process is continuing and seems to be the most impressive. Many nano-related journals (including classical physical, chemical and materials science ones) are also described and discussed.

  18. Hierarchical networks of scientific journals

    CERN Document Server

    Palla, Gergely; Mones, Enys; Pollner, Péter; Vicsek, Tamás

    2015-01-01

    Scientific journals are the repositories of the gradually accumulating knowledge of mankind about the world surrounding us. Just as our knowledge is organised into classes ranging from major disciplines, subjects and fields to increasingly specific topics, journals can also be categorised into groups using various metrics. In addition to the set of topics characteristic for a journal, they can also be ranked regarding their relevance from the point of overall influence. One widespread measure is impact factor, but in the present paper we intend to reconstruct a much more detailed description by studying the hierarchical relations between the journals based on citation data. We use a measure related to the notion of m-reaching centrality and find a network which shows the level of influence of a journal from the point of the direction and efficiency with which information spreads through the network. We can also obtain an alternative network using a suitably modified nested hierarchy extraction method applied ...

  19. Journals with Borders, Journals without Borders: Under-Representation of Asian Countries in Educational Research Journals

    Science.gov (United States)

    Atkinson, Roger

    2013-01-01

    As "Australasian Journal of Educational Technology" (AJET) Production Editor, the author evaluates whether AJET is providing a fair and adequate representation for researchers in Asian countries, with particular reference to AJET's aspiration to be "a front ranked international journal with an Australasian character"…

  20. Micro/nano-scale investigation on tin alloys and tin dioxide nanowires

    Science.gov (United States)

    Sun, Yong

    Tin (Sn) and its alloys have been at people's service since 3000 BC when bronze (alloy of tin and copper) was produced in large scale. They have unique properties and find applications in various engineering fields. Correspondingly, there is abundant information waiting to be clarified surrounding these Sn-related materials. As the key element used for solder alloys, the properties of Sn alloys have been of great interest to the electronic packaging community. At the same time, the intriguing phenomenon of spontaneous Sn whisker growth from Sn / Sn-alloy thin films have bothered, yet also inspired materials scientists for over 60 years. The most commonly seen Sn-containing compound, SnO 2, is in high demand as well due to its exceptional electronic and chemical properties. In addition, nanostructures of SnO2 are intensively studied for their potential applications as solid-state sensors, transparent conducting materials, lithium-ion batteries, high-efficiency solar cell and recently, supercapacitors. The objective of this proposed research is to explore the amazing properties of Sn and Sn-alloys from several different perspectives. Firstly, ever since the banish of lead in solder alloys, lead-free alloys such as Sn-Ag-Cu (SAC) has been put under the spotlight. We intend to use our expertise in nanomechanics to give an in-depth and thorough investigation on a popular SAC387 alloy. The mechanical properties of each phase and the local deformation mechanisms have been considered. Secondly, the Sn whisker growth phenomenon is to be re-visited. With the aid of digital image correlation (DIC) techniques, it was found that magnitude of the strain gradient plays an important role in whisker growth. Moreover, DIC helps to visualize the dynamic growth process in which the alteration of strain field has been identified to cause growth of subsequent whiskers. Last but not least, the performance of SnO2 nanowires is to be evaluated in several aspects including mechanical

  1. Teaching journalism or teaching African journalism? Experiences from foreign involvement in a journalism programme in Ethiopia

    Directory of Open Access Journals (Sweden)

    Terje S. Skjerdal

    2011-11-01

    Full Text Available Journalism programmes across the African continent have different attitudes to the issue of universal vs.
    local values in journalism. This article discusses the issue in light of a post-graduate journalism
    programme that opened at Addis Ababa University in 2004. In its 5-year implementation phase, the
    programme engaged educators from Europe and North America in addition to local instructors. Thus, one
    could expect a potential conflict between Western and Ethiopian approaches to journalism. However, on
    the basis of experiences with the Addis Ababa programme, the present study questions the assumed
    dichotomy between Western and Ethiopian (or African journalism discourses. Tensions did indeed come
    to the fore when the programme was planned and implemented, but they were defined by determinants
    such as professional background and personal preferences of the instructors involved rather than by
    geographical and cultural origin.

  2. FUTURE OF DERMATOVENEREOLOGICAL JOURNALS1.

    Science.gov (United States)

    Marinović, Branka

    2016-04-01

    Each year, during the Annual Meeting of the American Academy of Dermatology, there is a meeting of the Council of Dermatology Editors organized by Professor Larry Parish from Philadelphia. It is so nice to meet old friends there and make some new ones, but above all it is a very good platform to discuss the problems journals and their editors are facing today. Some of the topics we discussed during this year's meeting were the increasing number of case reports submitted to all dermatological journals, problems of plagiarism, the rising number of online journals, and the predatory policies quite often connected with them. There was also discussion on print vs online publication versions and on open access journals. It is always useful to discuss common problems, to realize that all journals have similar problems, and to exchange experiences in solving these problems. One of the problems all journals are facing is the increasing number of case reports being submitted, and their high rejection rate due to different reasons. Acta Dermatovenerologica Croatica is overloaded with case reports from many different countries around the world. Most of them are interesting, well prepared cases and could be a good way of exchanging experience between dermatologists. From my personal point of view, case reports are a very useful form of medical communication. For many years they were usually the first articles written by residents under the supervision of their mentors, and I think that all of us should insist on that in the future as well. But the problem is that it has become very difficult to find a journal willing to publish many case reports. Authors are trying to find a journal to publish their case reports in, sometimes sending them to many journals. Unfortunately, the rate of rejection of case reports is rising. And why? There are a few reasons for that, but probably one of the most important is that a high number of published case reports per issue of any journal

  3. Global Journalism Ethics: Widening the Conceptual Base

    OpenAIRE

    Stephen J. A. Ward

    2008-01-01

    For most of its history, journalism ethics has been highly practical in aim, in theorizing, and in application. Inquiry analyzed what was occurring inside newsrooms and its scope was parochial. Starting from the premise that a parochial approach no longer serves journalism, the study of journalism, or the public of journalism, in this paper it is argued that a major task of journalism ethics is to construct a more non-parochial ethics—a global journalism ethics informed by critical work from ...

  4. Ranking mainstream economics journals: A note

    OpenAIRE

    Halkos, George; Tzeremes, Nickolaos

    2012-01-01

    This paper by applying Data Envelopment Analysis (DEA) ranks Economics journals. In contrast with many other studies this paper ranks journals which are characterized as mainstream economic journals rather than interciplinary economic journals. By using one composite input and one composite output the paper ranks 180 journals. In addition for the first time three different quality ranking reports have been incorporated to the DEA modelling problem in order to classify the journals into four c...

  5. Journal of Clinical Medicine Editorial

    Directory of Open Access Journals (Sweden)

    Jane M. Grant-Kels

    2012-12-01

    Full Text Available “Why yet another journal?” Because this new journal will be different in that we are not just about new information but about understanding new information. We are online, peer reviewed, with a quick turnaround time from submission to publication and without any limit regarding length! Therefore, I am honored to introduce the Journal of Clinical Medicine (JCM, which has been created to serve as a hub for disseminating new findings and discoveries in clinical medicine to clinicians and medical researchers worldwide. [...

  6. Journal interaction. A bibliometric analysis of economics journals

    OpenAIRE

    Frandsen, Tove Faber

    2005-01-01

    Citation analysis is widely used as an evaluation method within sciences. This paper seeks to qualify citation analyses by adding insight into the sciences under investigation. The paper presents a method of citation analysis using multiple linear regressions on both cited and citing economic journals. The proposed method controls for the different characteristics of the journals as well as for their degree of interaction. The paper shows some of the hidden structures within the economic scie...

  7. Gorilla journal : journal de Berggorilla- & Regenwald-Direkthilfe

    OpenAIRE

    Berggorilla- & Regenwald-Direkthilfe e.V.

    1995-01-01

    Französische Ausgabe der Zeitschrift "Gorilla-Journal : Zeitschrift der Berggorilla- & Regenwald-Direkthilfe". Im Gorilla-Journal informieren wir unsere Mitglieder über die Aktivitäten des Vereins und berichten aus den Schutzprojekten, die wir unterstützen. Auch Aktionen unserer Mitglieder und Freunde werden vorgestellt. Außerdem enthält das Heft Artikel über Themen, die mit unserer Arbeit zusammenhängen.

  8. CFFTP journal issue no. 27

    International Nuclear Information System (INIS)

    A short journal article from Canadian Fusion Fuels Technology Project (CFFTP), highlighting Canadian ITER siting, new management at CFFTP, tritium recovery for OMEGA ICF laser, and Canadian papers at Tritium conference in Italy

  9. Peer review and journal models

    CERN Document Server

    Dall'Aglio, P

    2006-01-01

    Tentative analysis of alternative peer review and journal models. Open Access and Impact factor issues are not covered. The bibliography, in alphabetical order, lists articles and web sites (with brief description).

  10. Historic Climate Diaries and Journals

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Diaries and Journals containing weather information in a non-tabular format. Records date from 1735 through the early 20th century. Much of the weather and climate...

  11. EDITORIAL: Changes to the journal Changes to the journal

    Science.gov (United States)

    Zheludev, Nikolay I.

    2010-01-01

    It is a privilege to be Editor-in-Chief of Journal of Optics at this exciting time when the use of light spearheads the development of new technologies in telecommunications, green energy, manufacturing, medicine and defence, just to mention a few. These technological advances, seen by many as the next photonic technological revolution, are underpinned by fundamental and applied research in the following key directions: Nanophotonics and plasmonics Metamaterials and structured photonic materials Nonlinear and ultrafast optics Photonics at the life science interface Information and communication optics Integrated optics systems and devices Material processing with light Propagation, diffraction and scattering This is where Journal of Optics focuses its attention. This editorial marks the first issue of the journal published under the abbreviated name (shortened from Journal of Optics A: Pure and Applied Optics). The name change is just one of a series of changes introduced in the last year, along with the 8 subject sections listed above and the appointment of Section Editors. With the name change, we will also update the look of the journal by introducing colour cover images which will feature some of the most exciting research in the journal. We have retained many of the journal's original selling points: we are found in thousands of libraries around the world, and will continue our policy of free web access to all papers for 30 days after publication, ensuring broad and unrestricted dissemination of your research results. We will also continue our strong and well respected special issue and topical review programmes and we are always grateful to receive new suggestions for special issues or review articles. Along with the Editorial Board, I would like to thank the authors, referees and readers who have contributed to the success of Journal of Optics. The increasing quality and visibility of the journal, as demonstrated by the dramatic increase in its impact factor

  12. Global Journalism Ethics: Widening the Conceptual Base

    Directory of Open Access Journals (Sweden)

    Stephen J. A. Ward

    2008-01-01

    Full Text Available For most of its history, journalism ethics has been highly practical in aim, in theorizing, and in application. Inquiry analyzed what was occurring inside newsrooms and its scope was parochial. Starting from the premise that a parochial approach no longer serves journalism, the study of journalism, or the public of journalism, in this paper it is argued that a major task of journalism ethics is to construct a more non-parochial ethics—a global journalism ethics informed by critical work from various disciplines and cultures. The discussion presented charts the trajectory of journalism ethics over several centuries to explain the role of parochialism and the limits of theorizing in journalism ethics. This historical perspective also serves as a foundation for outlining what a future journalism ethics might look like, if we widen the conceptual base by incorporating new knowledge of media from outside journalism ethics, and by redefining journalism ethics as a global enterprise.

  13. Clinical relevance in anesthesia journals

    DEFF Research Database (Denmark)

    Lauritsen, Jakob; Møller, Ann M

    2006-01-01

    The purpose of this review is to present the latest knowledge and research on the definition and distribution of clinically relevant articles in anesthesia journals. It will also discuss the importance of the chosen methodology and outcome of articles.......The purpose of this review is to present the latest knowledge and research on the definition and distribution of clinically relevant articles in anesthesia journals. It will also discuss the importance of the chosen methodology and outcome of articles....

  14. Sustainability of a scientific journal

    OpenAIRE

    Getulio Teixeira Batista

    2014-01-01

    In this editorial, we discuss the necessary steps to guarantee the sustainability of Ambiente & Água journal as it grew in recognition by the scientific community. To publish world class scientific papers of professional quality, considerable amount of resources are necessary. Therefore, we will follow the trend of successful journals that have raised several funding sources to support the processing costs to publish in cutting edge technology that requires interoperability throughout a varie...

  15. Peace Journalism and its discontents

    Directory of Open Access Journals (Sweden)

    Jake Lynch

    2007-10-01

    Full Text Available This article is a response to criticisms of peace journalism from a journalist (David Loyn and a scholar (Thomas Hanitzsch by one who has recently gone from one profession to the other. It argues that journalists, like Loyn, often misrepresent the dividing lines in the debate over peace journalism because they take an unduly realist view of news and its relationship with the facts. This is tantamount to ignoring some of the most important insights of research into journalism and communications. On the other hand, scholars like Hanitzsch take an unduly conventionalist view, it argues, thereby excluding important arguments about the basis upon which we should prefer some representations of conflict over others, as being more accurate and more useful. Peace journalism bases its claims on observations about conflict, peace and violence by researchers in Peace and Conflict Studies, preferable as a basis for representing conflict to the often-unexamined conventions of the news industry. Peace journalism is also criticised as resting on an overly individualistic model of journalistic endeavour, attaching too little weight to the importance of structural constraints on the work of editors and reporters. This article acknowledges those constraints as governing, though not fully determining influences; but it also argues that peace journalism can contribute to the mobilization of social resources for structural reform, or for the existing structural provisions for public service concepts in journalism to be applied and carried out. Furthermore, some research into journalistic representations of conflict is insufficiently attentive to the insights of peace research, as distinct from research on journalism, a shortcoming which, the article says, invalidates some of its conclusions.

  16. Indexing of Mapping Science Journals

    OpenAIRE

    Stojanovski, Jadranka; Frančula, Nedjeljko; Lapaine, Miljenko

    2015-01-01

    Bibliometric analyses based on citations are most often at the forefront where scientific publications are concerned. A fact often neglected is that the visibility and availability of scientific publications are basic prerequisites for future reading, citation and influence. Journal visibility can be significantly improved by providing open access and availability through popular online databases. In this study, we investigated 112 mapping science journals to determine the visibility of sc...

  17. Journal Reading Habits of Internists

    OpenAIRE

    Saint, Sanjay; Christakis, Dimitri A.; Saha, Somnath; Elmore, Joann G.; Welsh, Deborah E.; Baker, Paul; Koepsell, Thomas D

    2000-01-01

    We assessed the reading habits of internists with and without epidemiological training because such information may help guide medical journals as they make changes in how articles are edited and formatted. In a 1998 national self-administered mailed survey of 143 internists with fellowship training in epidemiology and study design and a random sample of 121 internists from the American Medical Association physician master file, we asked about the number of hours spent reading medical journal...

  18. Save journalism - to what end?

    Directory of Open Access Journals (Sweden)

    Tobie Wiese

    2011-08-01

    Full Text Available I was given a rather sexy heading – 'Forget the rhino, save journalism' – under which to say a few words. I would agree with the assumption that both are under threat, but while most people will have a natural inclination to save an endangered animal I’m not so sure about how many will stand up for the survival of journalism. After all, why do we need journalism? And secondly, it seems to me that much of the woes that journalism is going through at present are self-inflicted.
    It is often said, also in these turbulent economic times, that when America sneezes, the world gets a cough. It would therefore not be inappropriate to look at some of the cures that have been offered for the condition of journalism in the United States, because many of the trends that first manifested there have already made themselves felt here. To this end I will rely largely on, and refer to, work of the Committee of Concerned Journalists (CCJ, as it has been recorded by Bill Kovach and Tom Rosenstiel, in The Elements of Journalism.

  19. An Overview and Analysis of Journal Operations, Journal Publication Patterns, and Journal Impact in School Psychology and Related Fields

    Science.gov (United States)

    Floyd, Randy G.; Cooley, Kathryn M.; Arnett, James E.; Fagan, Thomas K.; Mercer, Sterett H.; Hingle, Christine

    2011-01-01

    This article describes the results of three studies designed to understand better the journal operations, publishing practices, and impact of school psychology journals in recent years. The first study presents the results of a survey focusing on journal operations and peer-review practices that was completed by 61 journal editors of school…

  20. Faculty Perception of Business Education Journals.

    Science.gov (United States)

    Blair, Robert B.; Balachandran, Martha E.

    2002-01-01

    Responses from 51 of 134 members of the National Association of Business Teacher Education (NABTE) rated the quality of 22 business education journals. The top two were Delta Pi Epsilon Journal and NABTE Review. Refereed and national publications rated higher than nonrefereed or state journals. Most departments did not rank journals in the…

  1. The "Crane Problem" in Journalism Historiography.

    Science.gov (United States)

    Marmarelli, Ron

    Attempting to correct and amplify the portrayal of Stephen Crane in journalism history, this paper provides an analysis of relevant works in journalism and other disciplines in order to point out the weaknesses in the journalism historiography and to show how they apparently came about. Evidence is presented from the literature of journalism,…

  2. The Core Journal Concept in Black Studies

    Science.gov (United States)

    Weissinger, Thomas

    2010-01-01

    Black Studies scholars have shown interest in the core journal concept. Indeed, the idea of core journals for the study of the Black experience has changed several times since 1940. While Black Studies scholars are citing Black Studies journals with frequency, they also cite traditional disciplinary journals a great deal of the time. However,…

  3. Creativity and Mathematics: Using Learning Journals

    Science.gov (United States)

    Coles, Alf; Banfield, Gemma

    2012-01-01

    Does the term "learning journal" readily conjure up an image of something that is part of the normal mathematics classroom? Personally, do you ever use a journal of some form to help you organise your thoughts? Or, put quite simply--what is a learning journal? It might be that you are unfamiliar with the label, but journals are one type of…

  4. Wetting evaluation of silver based braze alloys onto zirconia metalized with reactive elements for application in oil well drill bots; Avaliacao do molhamento de ligas de adicao a base de prata sobre zirconia polida e metalizada com elementos ativos para aplicacao em brocas de perfuracao de pocos de petroleo

    Energy Technology Data Exchange (ETDEWEB)

    Pereira, J.C.; Silva, J.M.; Santos, P.R.F.; Nascimento, R.M.; Martinelli, A.E. [Universidade Federal do Rio Grande do Norte (UFRN), Natal, RN (Brazil). Dept. de Engenharia de Materiais], Email: jocabuzo@gmail.com; Pimenta, J.S. [Universidade Federal de Santa Catarina (UFSC), Florianopolis, SC (Brazil). Dept. de Engenharia Mecanica

    2010-07-01

    Drill bits with hard ceramic inserts are often used on drilling operations. The cutting and crushing action of rocks will produce failures in the tricone bits, which are related to wear; total or partial rupture of the drill bit body or even the inserts; thermal shock and corrosion. The research of better drill bits with ceramic inserts thermally more stable and mechanically stronger, will lead to an increase of their lifetime, and so reducing costs of substitution and maintenance. In the present work, some silver based braze alloys were melted onto zirconia YSZ substrates metallized or not with active metals. inside a furnace with vacuum of 10{sup -5} mbar to evaluate the wetting behavior. The system with AgCuTi and the non metallized YSZ ceramic, showed low contact angles and stable interfaces, which may be appropriate for brazing metal/ceramic parts. (author)

  5. In defense of peace journalism: A rejoinder

    Directory of Open Access Journals (Sweden)

    Samuel Peleg

    2007-10-01

    Full Text Available The following is a contribution to the ongoing debate about the merits and demerits of peace journalism. The writer, a proponent of the new philosophy, answers Loyn's and Hanitzsch's attacks by claiming that peace journalism has enough of novel insights and daring propositions to challenge conventional journalism and defy some of its basic tenets. Furthermore, peace journalism stems from a very clear epistemology, which aims at a more balanced and more comprehensive account of conflict. An account, which conventional journalism, due to structural, psychological and habitual constraints, will not and cannot perform. Consequently, peace journalism is worthy of being termed a significant development in the study and research of journalism.

  6. Reliability of journal impact factor rankings

    Directory of Open Access Journals (Sweden)

    Greenwood Darren C

    2007-11-01

    Full Text Available Abstract Background Journal impact factors and their ranks are used widely by journals, researchers, and research assessment exercises. Methods Based on citations to journals in research and experimental medicine in 2005, Bayesian Markov chain Monte Carlo methods were used to estimate the uncertainty associated with these journal performance indicators. Results Intervals representing plausible ranges of values for journal impact factor ranks indicated that most journals cannot be ranked with great precision. Only the top and bottom few journals could place any confidence in their rank position. Intervals were wider and overlapping for most journals. Conclusion Decisions placed on journal impact factors are potentially misleading where the uncertainty associated with the measure is ignored. This article proposes that caution should be exercised in the interpretation of journal impact factors and their ranks, and specifically that a measure of uncertainty should be routinely presented alongside the point estimate.

  7. Nonequilibrium self-organization in alloys under irradiation leading to the formation of nano composites

    International Nuclear Information System (INIS)

    Alloys under irradiation are continuously driven away from equilibrium: Every time an external particle interacts with the atoms in the solid, a perturbation very localized in space and time is produced. Under this external forcing, phase and microstructural evolution depends ultimately on the dynamical interaction between the external perturbation and the internal recovery kinetics of the alloy. We consider the nonequilibrium steady state of an immiscible binary alloy subject to mixing by heavy-ion irradiation. It has been found that the range of the forced atomic relocations taking place during collision cascades plays an important role on the final microstructure: when this range is large enough, it can lead to the spontaneous formation of compositional patterns at the nanometer scale. These results were rationalized in the framework of a continuum model solved by deriving a nonequilibrium thermodynamic potential. Here we derive the nonequilibrium structure factor by including the role of fluctuations. In order to consider an experimentally relevant situation, we perform kinetic Monte Carlo simulations of temperature-controlled heavy-ion irradiation in the immiscible model system Ag-Cu, where we obtain specific irradiation data by molecular dynamics simulations. We find that irradiation with 1 MeV Kr ions can indeed induce the spontaneous formation of a nanocomposite, in agreement with recent experimental results. Our results suggest, on the other hand, that this type of microstructure could not be obtained by irradiation with lighter particles, such as He ions. The simulation results predict, as well, the dependency of the structure factor on the type of irradiation particle used and are in qualitative agreement with the formula derived analytically. We propose that these statements can be tested by small angle scattering experiments

  8. Electrical Resistance Alloys and Low-Expansion Alloys

    DEFF Research Database (Denmark)

    Kjer, Torben

    1996-01-01

    The article gives an overview of electrical resistance alloys and alloys with low thermal expansion. The electrical resistance alloys comprise resistance alloys, heating alloys and thermostat alloys. The low expansion alloys comprise alloys with very low expansion coefficients, alloys with very low...... thermoelastic coefficients and age hardenable low expansion alloys....

  9. Models and Streams of Data Journalism

    OpenAIRE

    Uskali, Turo; Kuutti, Heikki

    2015-01-01

    This paper presents the initial results of a two-year research project, Data Journalism Work Practices, which focuses on newsrooms in Finland, the UK and the US. Data journalism or data-driven journalism has been defined simply as journalism based on large data sets (Rogers 2011; Bounegru et al. 2012.) According to our ongoing research on data journalism work methods, we can claim this has been an oversimplification. Based on six interviews of leading Finnish, American and British...

  10. Editorial: Journal of Contemporary Medical Sciences

    OpenAIRE

    Prof. Dr. Abbas Matrood Bashi

    2016-01-01

    In the first years of the journal life the Journal of Contemporary Medical Sciences (JCMS) acquired high successful rate and more researchers to publish with it. We thank all the researchers and subscribers who supported this magazine. Our journal deals with different subjects of basic and clinical medical sciences. It is an open access, peer-reviewed journal which has been accepted both nationally and internationally and encourages the researchers to publish with this journal. This journa...

  11. Journal Communication and Influence in Financial Research.

    OpenAIRE

    Borokhovich, Kenneth A, et al; Bricker, Robert J; Betty J Simkins

    1994-01-01

    This article uses the articles and citations from a set of eight finance journals to explore interjournal citation patterns, the research interests of individual journals, each journal's influence in particular areas, areas of recent interest to finance, and the extent of interdisciplinary borrowing by finance. The authors find the following: two journals comprise the research core of finance research, most journals publish in a variety of research areas but are influential in a smaller numbe...

  12. Narrative journalism as complementary inquiry

    Directory of Open Access Journals (Sweden)

    Jørgen Jeppesen

    2011-10-01

    Full Text Available Narrative journalism is a method to craft stories worth reading about real people. In this article, we explore the ability of that communicative power to produce insights complementary to those obtainable through traditional qualitative and quantitative research methods. With examples from a study of journalistic narrative as patient involvement in professional rehabilitation, interview data transcribed as stories are analyzed for qualities of heterogeneity, sensibility, transparency, and reflexivity. Building on sociological theories of thinking with stories, writing as inquiry, and public journalism as ethnography, we suggest that narrative journalism as a common practice might unfold dimensions of subjective otherness of the self. Aspiring to unite writing in both transparently confrontational and empathetically dialogic ways, the narrative journalistic method holds a potential to expose dynamics of power within the interview.

  13. Can Scientific Journals be Classified in terms of Aggregated Journal-Journal Citation Relations using the Journal Citation Reports?

    CERN Document Server

    Leydesdorff, Loet

    2009-01-01

    The aggregated citation relations among journals included in the Science Citation Index provide us with a huge matrix which can be analyzed in various ways. Using principal component analysis or factor analysis, the factor scores can be used as indicators of the position of the cited journals in the citing dimensions of the database. Unrotated factor scores are exact, and the extraction of principal components can be made stepwise since the principal components are independent. Rotation may be needed for the designation, but in the rotated solution a model is assumed. This assumption can be legitimated on pragmatic or theoretical grounds. Since the resulting outcomes remain sensitive to the assumptions in the model, an unambiguous classification is no longer possible in this case. However, the factor-analytic solutions allow us to test classifications against the structures contained in the database. This will be demonstrated for the delineation of a set of biochemistry journals.

  14. IDEAL: ACADEMIC PRESS JOURNALS ONLINE

    CERN Multimedia

    The Library

    2001-01-01

    All Academic Press journals are available online to CERN users for a test period which will last until the end of July. The service 'IDEALIBRARY' includes 174 scientific journals that cover several domains, ranging from engineering to mathematics, computing and physics. Titles covered are among others 'Atomic Data and Nuclear Data Tables', 'Nuclear Data Sheets', 'Annals of Physics', 'Journal of Parallel and Distributed Computing'. Reference citations present in each article are linked to the corresponding full text, when the latter is published by a member of the CrossRef consortium (members are: Elsevier, APS, AIP and others). Therefore, the navigation between articles and references is uninterrupted. A search engine allows queries by author, title and publication year. See http://www.idealibrary.com. At present the Library is evaluating a site license offer proposed by the publisher.

  15. Auditing the British Medical Journal.

    OpenAIRE

    Channer, K S

    1994-01-01

    The purpose of this study was to audit the outcome in terms of change in practice of the published research from one volume of the British Medical Journal. All original papers and short reports from one Volume 296 of the British Medical Journal (BMJ) 1988 were read and classified into theoretical only, practical and theoretical and practical. Those papers with any practical message were reviewed by one of a panel of specialists in the subject of the paper to assess if the recommendation made ...

  16. Promotion of Neurointervention to International Journal Based on Journal Metrics

    Science.gov (United States)

    2016-01-01

    Purpose The aim is to provide evidence of the internationalization of Neurointervention based on journal metrics for articles published from 2011 to 2015. Materials and Methods The following metrics and data were collected and analyzed with descriptive statistics: number of citable and non-citable articles; number of research articles (original papers) supported by grants; editorial board members' countries; authors' countries; citing authors' countries; source title of citing articles; two-year impact factor; total citations; and Hirsch index (h-index). Data were retrieved and analyzed from the journal homepage and Web of Science Core Collection in January 24, 2016. Results There were 80 citable and eight non-citable articles from 2011 to 2015. Out of 31 original articles, nine had research funds (29.0%). Editorial board members are from five countries. The authors are from six countries. The top-ranking countries of citing authors were USA, Korea, and China. The two-year impact factors were 1.125, 0.923, and 0.931 from 2013 to 2015. H-index was 7. Conclusion It was possible to confirm the internationalization of Neurointervention based on journal metrics. New digital standards should be adopted for more rapid dissemination of journal content. PMID:26958406

  17. Pb-free Sn-Ag-Cu ternary eutectic solder

    Science.gov (United States)

    Anderson, Iver E.; Yost, Frederick G.; Smith, John F.; Miller, Chad M.; Terpstra, Robert L.

    1996-06-18

    A Pb-free solder includes a ternary eutectic composition consisting essentially of about 93.6 weight % Sn-about 4.7 weight % Ag-about 1.7 weight % Cu having a eutectic melting temperature of about 217.degree. C. and variants of the ternary composition wherein the relative concentrations of Sn, Ag, and Cu deviate from the ternary eutectic composition to provide a controlled melting temperature range (liquid-solid "mushy" zone) relative to the eutectic melting temperature (e.g. up to 15.degree. C. above the eutectic melting temperature).

  18. Political journalism in comparative perspective

    NARCIS (Netherlands)

    E. Albæk; A. van Dalen; N. Jebril; C.H. de Vreese

    2014-01-01

    Political journalism is often under fire. Conventional wisdom and much scholarly research suggest that journalists are cynics and political pundits. Political news is void of substance and overly focused on strategy and persons. Citizens do not learn from the news, are politically cynical, and are d

  19. [Publishing models in medical journals].

    Science.gov (United States)

    Reyes, Humberto B

    2012-02-01

    Medical journals are published by scientific societies, universities, publishing agencies and other for-profit or non-profit organizations. The traditional way to cover the expenses in printed journals has been a "subscribers pay" model. The rise of electronic versions in the internet, either together with the printed version or replacing it entirely, plus a progressive adherence to an "open access" for electronic versions, has created financial difficulties. Therefore, the "authors pay" model has been added. Both models can be subsidized by commercial or institutional advertising, but still a main source for financing relies either in subscriptions or in authors' payments. A small source of income that helps to cover publishing costs is a "charge for manuscript reception", currently applied by several journals. Those authors whose work has institutional or external support can use their grants to cover any charges, but the situation is more difficult for those who do not have such support. Since 1872, Sociedad Médica de Santiago-Chilean Society of Internal Medicine, owner and publisher of Revista Médica de Chile, has employed the "subscribers pay" model, subsidized by commercial advertising and temporary sponsors (Chilean government and others). The printed journal is reproduced in an open access electronic version, in www.scielo.cl. The increasing cost of both publications systems demands a time for reflection. PMID:22739959

  20. THE LIST OF JOURNALS ABSTRACTED

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    Academic Journal of the First Medical University of PLA; Acad J Ist Med Univ PLA Acta Academiae Medicinae Bengbu; Acta Acad Med Bengbu Acta Academiae Medicinae Hebei; Acta Acad Med Hebei Acta Academiae Medicinae Nanjing; Acta Acad Med Nanjing Acta Academiae Medicinae Nantong; Acta Acad Med Nantong

  1. The knowledge base of journalism

    DEFF Research Database (Denmark)

    Svith, Flemming

    theories on practice and knowledge. As the result of an abductive reasoning is a theory proposal, there is a need for more deductive approaches to test the validity of this knowledge base claim. It is thus relevant to investigate which rationales are included in the knowledge base of journalism, as the...

  2. Iranian Journal of Radiation Research

    International Nuclear Information System (INIS)

    Iranian Journal of Radiation Research published original scientific research and clinical investigation related to radiation oncology, radiation biology, and medical physics. The clinical studies submitted for publication include experimental studies of combined modality treatment, especially chemoradiotherapy approaches, and relevant innovations in hyperthermia, brachytherapy, high LET irradiation, nuclear medicine, dosimetry, tumor imaging, radiation treatment planning, radiosensitizers, and radioprotectors

  3. Television Journalism During Terror Attacks

    DEFF Research Database (Denmark)

    Mogensen, Kirsten

    This article views television news coverage of ongoing terrorist attacks and their immediate aftermath as a special genre within journalism, and describes norms connected with the genre. The description is based on qualitative analyses of the coverage on the major American networks in the fi rst ...

  4. Television journalism during terror attacks

    DEFF Research Database (Denmark)

    Mogensen, Kirsten

    2008-01-01

    This article views television news coverage of ongoing terrorist attacks and their immediate aftermath as a special genre within journalism, and describes norms connected with the genre. The description is based on qualitative analyses of the coverage on major American networks the first 24 hours...

  5. Journal-Induced Historical Myopia.

    Science.gov (United States)

    Burlbaw, Lynn M.

    2000-01-01

    School reform implementations most often proceed from an ahistorical position. A study analyzing articles in three volumes of each of two education journals ("Phi Delta Kappan" and "Educational Leadership") revealed that 17 to 48 percent had no references to support assertions; few references were older than 15 years. (Contains 11 references.)…

  6. The Future of Electronic Journals.

    Science.gov (United States)

    Varian, Hal R.

    It is widely expected that a great deal of scholarly communication will move to an electronic format. This paper speculates about the impact this movement will have on the form of scholarly communication. In order to understand how journals might evolve, the paper begins with a look at the demand and supply for scholarly commutation today, as well…

  7. Chiropractic & Osteopathy. A new journal

    OpenAIRE

    Walker Bruce F; French Simon D; Cameron Melainie

    2005-01-01

    Abstract Both chiropractic and osteopathy are over a century old. They are now regarded as complementary health professions. There is an imperative for both professions to research the principles and claims that underpin them, and the new journal Chiropractic & Osteopathy provides a scientific forum for the publication of such research.

  8. Chiropractic & Osteopathy. A new journal

    Directory of Open Access Journals (Sweden)

    Walker Bruce F

    2005-04-01

    Full Text Available Abstract Both chiropractic and osteopathy are over a century old. They are now regarded as complementary health professions. There is an imperative for both professions to research the principles and claims that underpin them, and the new journal Chiropractic & Osteopathy provides a scientific forum for the publication of such research.

  9. A course in Peace Journalism

    Directory of Open Access Journals (Sweden)

    Jake Lynch

    2007-04-01

    Full Text Available This article sets out a reasoned and annotated plan for a short course in Peace Journalism, suitable for teaching to students of Journalism, Communications, Media and Peace and Conflict Studies. It is based on courses the author has taught, over many years, and the aim of the article is to help teachers to devise their own courses. The best way to help students to begin thinking about issues in the representation of conflicts, the article argues, is to give them a flavour of it, by showing them different ways in which the same story can be told. The article gives story-boards and scripts for two television news treatments of the same event, a bombing in the Philippines. The first is an example of War Journalism, it is argued; the second, Peace Journalism. The article suggests ways to develop a course from this illustrative starting point, to ask why the distinctions between these two approaches should be considered important - both in their own terms, and in terms of their potential influence on the course of events in conflict. Different approaches to conceptualising and measuring this possible influence are discussed, with suggestions for further exploration. The article recounts some of the author's experiences in introducing and discussing what is, inevitably sometimes, difficult and sensitive material, with groups including participants from conflict-affected countries - Palestine, Israel and the Philippines. Not all students will be aspiring journalists. The article offers brief notes on practical Peace Journalism, as well as showing how learning outcomes can be formulated to allow the same issues to be tackled in the form of a civil society campaign, or as a peace-building intervention in conflict. The article also explains how students can be equipped to question elements of journalistic practice which they may take for granted, and which pass unexamined in many current journalism courses. That, in turn, entails examining the emergence

  10. Are claims made in orthodontic journal advertisements evidence-supported?

    OpenAIRE

    Livas, Christos; Kouskoura, Thaleia; Ren, Yijin; Katsaros, Christos; Pandis, Nikolaos

    2015-01-01

    OBJECTIVE To examine the supporting evidence of advertisements published in six leading orthodontic journals. MATERIALS AND METHODS The 2012-2013 printed issues of American Journal of Orthodontics and Dentofacial Orthopedics, Australian Orthodontic Journal, Journal of Orthodontics, European Journal of Orthodontics, Journal of Clinical Orthodontics, and Journal of Orofacial Orthopedics were screened for advertisements implying superior performance compared with competitor products....

  11. IMC formation on BGA package with Sn-Ag-Cu and Sn-Ag-Cu-Ni-Ge solder balls

    International Nuclear Information System (INIS)

    Solder balls were attached to the Cu/Ni-P/Au metallized BGA substrate. The two solder ball used in this study are Sn-3.2Ag-0.5Cu and Sn-3.5Ag-0.5Cu-0.07Ni-0.01Ge. The package was subjected to thermal aging at 150 deg. C for 100-1000 h in order to investigate IMC formation behavior. Cross sections and the surface of the IMC layer, revealed through etching of the unreacted solder, were inspected and analyzed with SEM and EDX. The IMCs mainly consist of two morphologies, hexagonal and whisker. The hexagonal crystal was identified as (Cu, Ni)6Sn5 and the whisker crystal is (Ni, Cu)3Sn4. The dissolution of Ni in Cu6Sn5 results in a synergistic effect that enhances the growth of the compound, and a similar effect was not observed when dissolved Cu was present in Ni3Sn4. This phenomenon is possibly due to the vacant energy band of the 3d-orbital of Ni. Ag3Sn was also detected in the solder region near the interfacial IMC. The Ag3Sn was not in direct contact with the BGA substrate

  12. Queen's discovery lauded by top scientific journal

    CERN Multimedia

    McGrady, S

    2002-01-01

    A scientific breakthrough at Queen's University's Sudbury Neutrino Observatory has received major international recognition. The journal Science ranked the discovery that cracked the "neutrino problem" second, in the journal's top 10 scientific achievements of 2002 (1/2 page).

  13. Networking Journalism Studies: Towards a World Journalism Survey

    OpenAIRE

    Thomas Hanitzsch

    2011-01-01

    Most scholars argue that cross-national research is indispensable for establishing the generalizability of theories and the validity of interpretations derived from single-nation studies. Another important aspect of comparative studies is that they force us to test our interpretations against cross-cultural diferences and inconsistencies. In journalism studies, the advantages of cross-national research are obvious. While the empirical inquiry into news-making has generated a vast quantity of ...

  14. Journalism is changing – and what about journalism ethics?

    OpenAIRE

    Fidalgo, Joaquim

    2013-01-01

    Major changes have been challenging journalism in the last two decades, in the context of the ‘digital age’. The technological possibilities developed in the ‘information society’, together with the social and cultural trend for more participation, opened this field to new actors, which caused professional journalists to lose their traditional monopoly of searching, gathering, editing and diffusing news in the public sphere. At the same time, these new possibilities of communicating are incr...

  15. Preconditions for Citizen Journalism: A Sociological Assessment

    OpenAIRE

    Hayley Watson

    2011-01-01

    The rise of the citizen journalist and increased attention to this phenomenon requires a sociological assessment that seeks to develop an understanding of how citizen journalism has emerged in contemporary society. This article makes a distinction between two different subcategories of citizen journalism, that is independent and dependent citizen journalism. The purpose of this article is to present four preconditions for citizen journalism to emerge in contemporary society: advanced technolo...

  16. THE BIRTH OF A NEW JOURNAL

    OpenAIRE

    Hari Kumar, K.V.S.; Veerendra Kumar Arumalla

    2012-01-01

    On behalf of all members of the editorial board, we welcome you to our new online journal, International Journal of Medical and Health Sciences. In this era of explosive growth of knowledge and publishing, we have the audacity to launch this journal to correct the anomalies related to the research productivity from India. Our efforts in delivering this baby originated from a prolonged unfavorable experience with the existing medical journals published from India. Most of the authors publishin...

  17. High-impact open access journals

    OpenAIRE

    Vallez, Mari; Pagès i Camps, Gerard

    2014-01-01

    Poster presentado en el LIBER 43rd Annual Conference . Se muestra la herramienta "High-impact open access journals ¿" creada por la Biblioteca de la Universitat Oberta de Catalunya¿. Esta herramienta facilita una lista de revistas de acceso abierto recogidas en el Directory of Open Access Journals (DOAJ) que tienen factor de impacto en el Journal Citation Reports 2011 o están enSCImago Journal Rank.

  18. Index of Selected Textile Journals of 2002

    OpenAIRE

    Rafiq, Muhammad

    2003-01-01

    It is the complete index of the six renowned journals of textiles. The index is arranged by keywords and entries are well formated. The index covers the published issues of year 2002 of the following journals. Library World, Coloration Technology, AATCC Review, Pakistan Textile Journal, Textile Research Journal, International Dyer, and Textile Today. The index is useful for textile designers, textile engineers, fashion designers, managers, decision makers, and researchers.

  19. Structural Equivalence in a Journal Network.

    Science.gov (United States)

    Doreian, Patrick; Fararo, Thomas J.

    1985-01-01

    Techniques used in contemporary social network analysis are applied to citation data for a network of journals from three time periods--1970/71, 1975/76, 1980/81. Blocks or positions in journal network based on structural equivalence correspond closely to categorization by aims and objectives. Hypotheses concerning journal networks are advanced.…

  20. Journalism Studies in China, 1903-1985.

    Science.gov (United States)

    Lau, Tuen-yu

    By analyzing the subject matter of journalism books published in China since 1903, a study reviews the scope and trends of Chinese journalism studies, specifically the post-1949 developments after the Chinese Communist Party came to power. The study analyzes 1,245 titles of journalism books from 1903 to 1985, compiled in the "China Journalism…

  1. Reinventing Journalism Curricula for the Electronic Environment.

    Science.gov (United States)

    Huesca, Robert

    2000-01-01

    Offers an overview of key concepts within hypertext research, discussing its relevance to the theories and practices of journalism. Surveys recent books and articles on new technologies in journalism. Describes a university reporting and writing course that responds to the fundamental challenges of hypertext to contemporary journalism. Examines…

  2. ICT Use by Journalism Professors in Colombia

    Science.gov (United States)

    Hung, Elias Said

    2011-01-01

    This article analyses how journalism professors at Colombian universities use information and communications technologies (ICT) in their teaching. Survey data was obtained during the first trimester of 2009 from 63 professors in journalism departments and from a total of 865 professors who are affiliated with journalism departments at 29…

  3. Transformation of Communication Processes: Data Journalism

    OpenAIRE

    Radchenko Irina; Kayser-Bril Nicolas; Valeeva Anastasia

    2016-01-01

    This article gives a brief review of the history of data journalism, as well as the prerequisites for its appearance. The authors describe the advantages of employing data-journalism skills in the newsrooms. Finally, the article provides a review of data-driven journalism projects all over the world, state of art 2014.

  4. Aerospace—An Open Access Journal

    OpenAIRE

    Konstantinos Kontis

    2014-01-01

    Welcome to Aerospace, an open journal covering aerospace science, engineering and technology. We seek to publish theoretical, fundamental, and applied results linked to potential applications related to research, design, manufacture, operations, control and maintenance of aircraft and spacecraft. A full description of the journal scope can be found on the journal website [1].[...

  5. Reflective Journals: A Review of the Literature

    Science.gov (United States)

    Lindroth, James T.

    2015-01-01

    The use of reflective journals has been identified as an effective tool to promote reflection in preservice teachers. This review of literature provides the reader with an understanding of the various ways journals are used and assessed in teacher education programs. The findings of this review outline the use of reflective journals on topics such…

  6. Impact factor trends for general medical journals: non-English-language journals are lagging behind

    DEFF Research Database (Denmark)

    Vinther, Siri; Rosenberg, Jacob

    2012-01-01

    The impact factor (IF) is a common citation metric used for evaluating and comparing scientific journals within a certain field. Previous studies have shown that IFs are increasing. However, rates may depend on journal publication language. The aim of this study was to determine IF values and...... trends for general medical journals, comparing non-English-language with English-language journals....

  7. Comparison of Journal Citation Reports and Scopus Impact Factors for Ecology and Environmental Sciences Journals

    Science.gov (United States)

    Gray, Edward; Hodkinson, Sarah Z.

    2008-01-01

    Impact factors for journals listed under the subject categories "ecology" and "environmental sciences" in the Journal Citation Reports database were calculated using citation data from the Scopus database. The journals were then ranked by their Scopus impact factor and compared to the ranked lists of the same journals derived from Journal…

  8. Demystifying the reflective clinical journal

    International Nuclear Information System (INIS)

    Student learning on clinical placement is a complex issue and cannot be defined solely by just doing things. Reflection during clinical practice is essential if the student is going to learn from the experience. Therefore it is important for educators to include as part of clinical education programs learning strategies that encourage reflection. The reflective clinical journal is an educational tool that is employed by the School of Medical Radiation Sciences at the University of Sydney to encourage reflection of undergraduate radiation therapy students whilst on clinical placement. This discussion paper explores the key concepts of reflection and the reflective clinical journal. Due to the paucity of information about this issue in radiation therapy the literature reviewed is from across all areas of the health sciences

  9. Demystifying the reflective clinical journal

    Energy Technology Data Exchange (ETDEWEB)

    Milinkovic, Danielle [School of Medical Radiation Sciences, Faculty of Health Sciences, University of Sydney, PO Box 170, Lidcombe NSW 1825 (Australia)]. E-mail: d.milinkovic@fhs.usyd.edu.au; Field, Nikki [School of Medical Radiation Sciences, Faculty of Health Sciences, University of Sydney, PO Box 170, Lidcombe NSW 1825 (Australia)

    2005-08-01

    Student learning on clinical placement is a complex issue and cannot be defined solely by just doing things. Reflection during clinical practice is essential if the student is going to learn from the experience. Therefore it is important for educators to include as part of clinical education programs learning strategies that encourage reflection. The reflective clinical journal is an educational tool that is employed by the School of Medical Radiation Sciences at the University of Sydney to encourage reflection of undergraduate radiation therapy students whilst on clinical placement. This discussion paper explores the key concepts of reflection and the reflective clinical journal. Due to the paucity of information about this issue in radiation therapy the literature reviewed is from across all areas of the health sciences.

  10. International Journal of Mathematical Combinatorics

    OpenAIRE

    2015-01-01

    The International J.Mathematical Combinatorics (ISSN 1937-1055) is a fully refereed international journal, sponsored by the MADIS of Chinese Academy of Sciences and published in USA quarterly comprising 100-150 pages approx. per volume, which publishes original research papers and survey articles in all aspects of Smarandachemulti-spaces, Smarandache geometries, mathematical combinatorics, non-euclidean geometry and topology and their applications to other sciences.

  11. Narrative journalism as complementary inquiry

    OpenAIRE

    Jørgen Jeppesen; Helle Ploug. Hansen

    2011-01-01

    Narrative journalism is a method to craft stories worth reading about real people. In this article, we explore the ability of that communicative power to produce insights complementary to those obtainable through traditional qualitative and quantitative research methods. With examples from a study of journalistic narrative as patient involvement in professional rehabilitation, interview data transcribed as stories are analyzed for qualities of heterogeneity, sensibility, transparency, and ref...

  12. Redesigning journal club in residency

    OpenAIRE

    Al Achkar M

    2016-01-01

    Morhaf Al Achkar Department of Family Medicine, Indiana University, Indianapolis, IN, USA Abstract: The gap between production and implementation of knowledge is the main reason for the suboptimal quality of health care. To eliminate this gap and improve the quality of patient care, journal club (JC) in graduate medical education provides an opportunity for learning the skills of evidence-based medicine. JC, however, continues to face many challenges mainly due to poorly defined goals, inadeq...

  13. Statistics of Open Access Journals

    OpenAIRE

    Toni, Franco

    2006-01-01

    The exponential growth of e-journal access and downloads has strongly enhanced the role of statistical data, in order to evaluate the use of resources and define subscription acquisition strategies and their management. On one hand, the automatic data harvesting performed by computers provides statistics, but on the other hand it does not guarantee the comparability and harmonisation of collected data. Therefore, the process of statistical data formulation has to be supported by the use...

  14. CERN Library - Scientific journal cancellations

    CERN Multimedia

    2004-01-01

    Due to the constant increase of the subscription costs of scientific journals and the current budget restrictions, the Scientific Information Policy Board has mandated the Working Group for Acquisitions (WGA) together with the Library to propose a list of titles to be cancelled at the end of 2004. As a first step, the WGA has identified the scientific journals listed at the web site below as candidates for cancellation. The choice has been guided by the personal experience of the WGA members, consultation of other expert CERN staff for highly specialized titles, and by criteria such as subscription price, impact factor, and - where available - access statistics for electronic journals. The list also accounts for the fact that many titles are subscribed to in 'packages' such that a cancellation of individual titles would not lead to any cost savings. We invite users to carefully check the list on the Library homepage (http://library.cern.ch/). If you find any title that you consider critically important for y...

  15. CytoJournal joins 'open access' philosophy

    Directory of Open Access Journals (Sweden)

    Shidham Vinod B

    2004-07-01

    Full Text Available Abstract Welcome to CytoJournal! We would like to introduce you to your journal, one that is run by and for the scientific cytopathology community with incontestable benefits of Open Access, and support from Cytopathology Foundation, Inc. http://www.cytopathology-foundation.org/index.htmlCytoJournal is a peer-reviewed, PubMed indexed, online journal, publishing research in the field of cytopathology and related areas, with world wide free access. Authors submitting to CytoJournal retain the copyright to their hard earned work.

  16. Making room for pluralism by redefining journalism

    DEFF Research Database (Denmark)

    Meyer, Gitte; Lund, Anker Brink

    2006-01-01

    Motivated by the ideal of pluralism, this essay explores an apparent paradox: although many different kinds of journalism may have evolved, because journalism is only vaguely defined by connections to ‘the media' and ‘news', there is a trend towards increasing journalistic standardization. It is...... proposed that this standardization represents attempts to rationalize journalism. But rationalism is a framework of thought which is alien to journalism and to political life in general, it is argued. As an alternative framework for the philosophy and practice of journalism, the classical notions of praxis...

  17. Seventy Years of the Journal "Medical Archives".

    Science.gov (United States)

    Masic, Izet

    2016-02-01

    This year journal "Medical Archives" celebrates 70th anniversary of its continuing publication. Medical Archives is oldest biomedical journal in Bosnia and Herzegovina and one of the oldest medical journals in Europe, established in the year 1947, as official scientific and professional journal of Association of Physicians of Bosnia and Herzegovina. Until present Medical Archives has published over 5000 articles. Today Medical Archives is internationally recognized medical peer-reviewed indexed journal, visible in more than 30 international on-line databases. PMID:26980925

  18. Comparison Between Impact Factor, Eigenfactor Metrics, and SCimago Journal Rank Indicator of Pediatric Neurology Journals

    OpenAIRE

    Kianifar, Hamidreza; Sadeghi, Ramin; Zarifmahmoudi, Leili

    2014-01-01

    Background: Impact Factor (IF) as a major journal quality indicator has a series of shortcomings including effect of self-citation, review articles, total number of articles, etc. In this study, we compared 4 journals quality indices ((IF), Eigenfactor Score (ES), Article Influence Score (AIS) and SCImago Journal Rank indicator (SJR)) in the specific Pediatric Neurology journals. Methods: All ISI and Scopus indexed specific Pediatric Neurology journals were compared regarding their 2011 IF, E...

  19. Women's Involvement in Educational Psychology Journals from 1976 to 2004

    Science.gov (United States)

    Evans, Joy; Hsieh, Peggy Pei-Hsuan; Robinson, Daniel H.

    2005-01-01

    Previously, Robinson, McKay, Katayama, and Fan (1998) examined women's involvement in six educational psychology journals ("American Educational Research Journal," "Contemporary Educational Psychology," "Educational Psychologist," "Educational Psychology Review," "Journal of Experimental Education," and "Journal of Educational Psychology") from…

  20. Are claims made in orthodontic journal advertisements evidence-supported?

    NARCIS (Netherlands)

    Livas, Christos; Kouskoura, Thaleia; Ren, Yijin; Katsaros, Christos; Pandis, Nikolaos

    2015-01-01

    Objective: To examine the supporting evidence of advertisements published in six leading orthodontic journals. Materials and Methods: The 2012-2013 printed issues of American Journal of Orthodontics and Dentofacial Orthopedics, Australian Orthodontic Journal, Journal of Orthodontics, European Journa

  1. Exploring overlay journals: the RIOJA project

    CERN Document Server

    CERN. Geneva

    2007-01-01

    Researchers in cosmology and astrophysics depend on the arXiv repository for the registration and dissemination of their work, as well as for current awareness, yet they continue to submit papers to journals for review. Could rapid quality certification be overlaid directly onto the arXiv repository? This presentation introduces the RIOJA (Repository Interface to Overlaid Journal Archives) project, on which a group of cosmology researchers from the UK is working with UCL Library Services and Cornell University. The project is creating a tool to support the overlay of journals onto repositories, and will demonstrate a cosmology journal overlaid on top of arXiv. RIOJA will also work with the cosmology community to explore the social and economic aspects of journal overlay in this discipline: what other value, besides the quality stamp, does journal publication typically add? What are the costs of the ideal overlay journal for this community, and how could those costs be recovered? Would researchers real...

  2. INIS: Authority List for Journal Titles

    International Nuclear Information System (INIS)

    This is the nineteenth revision of the INIS: Authority List for Journal Titles (IAEA-INIS-11). It lists 10,797 journal titles which have contained articles within the scope of INIS. The purpose of this Authority List is to provide descriptive cataloguers with a standard abbreviation for journal titles and to assist users of INIS products with a tool for verifying the full title of a journal. A journal, or periodical, is generally published within a defined, fixed interval between issues, which usually has more than one issue a year, and which usually includes a mixture of articles, letters, summaries, etc. Within this definition, annuals such as Annual Review of Nuclear Science are included. Series titles as, for example the McGraw-Hill Series in Nuclear Engineering, are not included in this Authority. Entries: Each entry consists of: - the full journal title (highlighted); - the abbreviated title; - ISSN, if available; - CODEN, if available; - additional information related to the journal title. Arrangement: In Part I, the full journal titles are grouped by country or international organization name and ordered alphabetically, followed by the ISSN, the CODEN in square brackets if available, and then the abbreviated title. The abbreviated title is based on the rules of ISO 4: Documentation - International Code for the Abbreviation of Titles of Periodicals. The abbreviations of the words are taken from the ISDS List of Periodical Title Word Abbreviation. In Part II, the order of the citations is reversed: the abbreviated journal titles are arranged alphabetically, followed by country code. Then the full journal titles are followed by the country of publication, and if available, ISSN and CODEN. Additional Information: There is important information related to the journal titles which are fundamental for tracing the history of the title and the present status. They are listed below and are entered whenever applicable: - Ceased publication; - Superseded by

  3. Vanadium alloys: development strategy

    International Nuclear Information System (INIS)

    A strategy for the development of vanadium alloys for use in radiation environments is outlined. An attractive reference alloy (V-15Cr-5Ti) has been identified. The critical issues in developing vanadium base alloys are summarized

  4. New journal on biological frontiers

    Institute of Scientific and Technical Information of China (English)

    Weihua WU

    2010-01-01

    @@ Frontiers in Biology, an international peer-reviewed scientific journal to be published bi-monthly, is launched today. It is jointly published by Higher Education Press and Springer. The joumal provides a forum for a broad blend of peer-reviewed articles to promote rapid communication and exchanges among biologists around the world. The primary criterion for publication is new insights that are of broad interest to biologists, not just specialists, and the presentation of results must be appropriate to a wide audience of biologists.

  5. Journal Of The Korean Hydrogen Energy Society 3

    International Nuclear Information System (INIS)

    This book is the Journal of the Korean hydrogen energy society, which includes study on the improvement of the electrochemical characteristics of surface-modified V-Ti-Cr alloy by Ball-milling by Kim, Jin Ho; Lee, Sang Min; Lee, Ho; Lee, Paul S. and Lee, Jai Young, hydrogen generation from water using cds-zns photocatalysts by Heo, Gwi Suk, characteristics of Y-Hx Film by Cho, Young Sin; Kim, Sun Hee, and effect of Cu powder as a compacting material on the discharge characteristics of the negative electrode of Ni-MH battery by Jung, J. H.; Han, Y. S.; Yu, J. S.; Jang, K. J.; Lee, J. Y.

  6. Redesigning journal club in residency

    Directory of Open Access Journals (Sweden)

    Al Achkar M

    2016-05-01

    Full Text Available Morhaf Al Achkar Department of Family Medicine, Indiana University, Indianapolis, IN, USA Abstract: The gap between production and implementation of knowledge is the main reason for the suboptimal quality of health care. To eliminate this gap and improve the quality of patient care, journal club (JC in graduate medical education provides an opportunity for learning the skills of evidence-based medicine. JC, however, continues to face many challenges mainly due to poorly defined goals, inadequate preparation, and lack of interest. This article presents an innovative model to prepare and present JC based on three pillars: dialogical learning through group discussion, mentored residents as peer teachers, and including JC as part of a structured curriculum to learn evidence-based medicine. This engaging model has the potential to transform JC from a moribund session that is daunting for residents into a lively discussion to redefine clinical practice using the most current evidence. Keywords: journal club, residents, peer teaching, evidence-based medicine, dialogical learning

  7. Citation analysis of Journal of Documentation

    Directory of Open Access Journals (Sweden)

    Navneet Kaur

    2011-06-01

    Full Text Available Citation analysis of all the journal articles published in the Journal of Documentation from 1996-2010 is carried out. 487 articles are published in the journal during 15 years. Highest numbers (44 of articles are published in the year 2005. The journal contained 15587 citations from 1996-2010. Average number of citation per article is maximum in the year 2009. This study also covers the analyses of authorship patterns in citing article. In authorship pattern, single author citations are dominant than others and it is 201 (49%. This study also reveals that Journal of Documentation is the most preferred journal used by authors in their citation. The paper concludes that only 10 core periodicals can cover more than 2951 (16 % references.

  8. The Best in CytoJournal: 2005

    Directory of Open Access Journals (Sweden)

    Cohen Michael

    2006-01-01

    Full Text Available Abstract CytoJournal opened its doors in late 2004 and 2005 was the first full year of publication. In order to celebrate this event as well as recognize the contributing authors works, CytoJournal has initiated a Best Article of the Year, in this case 2005. This year's Best of CytoJournal: 2005 is an excellent review of thyroid FNAB.

  9. Oil film pressure in hydrodynamic journal bearings

    OpenAIRE

    Valkonen, Antti

    2009-01-01

    Hydrodynamic journal bearings are critical power transmission components that are carrying increasingly high loads because of the increasing power density in various machines. Therefore, knowing the true operating conditions of hydrodynamic journal bearings is essential to machine design. Oil film pressure is one of the key operating parameters describing the operating conditions in hydrodynamic journal bearings. Measuring the oil film pressure in bearings has been a demanding task and theref...

  10. Journals and repositories: an evolving relationship?

    OpenAIRE

    Pinfield, Stephen

    2009-01-01

    It is now widely accepted that there are two routes to open access (OA): OA repositories and OA journals. It is often assumed these are distinct alternative parallel tracks. However, it has recently become clear that there is potential for repositories and journals to interact with each other on an ongoing basis and between them to form a coherent OA scholarly communication system. This paper puts forward three possible models of interaction between repositories and journals; services such as...

  11. The Journal Rankings of Central Banks

    OpenAIRE

    Kohlscheen, Emanuel

    2011-01-01

    This paper analyzes the citation patterns of the central banks of the 15 largest monetary areas of the world that had an active working paper series in 2010. It proceeds to construct a novel journal ranking that is more suited for monetary authorities than the academic journal rankings currently in vogue. We report individual country rankings as well as the global rankings. While important regional differences emerge, the Journal of Monetary Economics, the American Economic Review, the Journa...

  12. Journal of New Democratic Methods: An Introduction

    OpenAIRE

    Funge, John David

    2004-01-01

    This paper describes a new breed of academic journals that use statistical machine learning techniques to make them more democratic. In particular, not only can anyone submit an article, but anyone can also become a reviewer. Machine learning is used to decide which reviewers accurately represent the views of the journal's readers and thus deserve to have their opinions carry more weight. The paper concentrates on describing a specific experimental prototype of a democratic journal called the...

  13. Chinese journals: a guide for epidemiologists

    OpenAIRE

    Fung Isaac CH

    2008-01-01

    Abstract Chinese journals in epidemiology, preventive medicine and public health contain much that is of potential international interest. However, few non-Chinese speakers are acquainted with this literature. This article therefore provides an overview of the contemporary scene in Chinese biomedical journal publication, Chinese bibliographic databases and Chinese journals in epidemiology, preventive medicine and public health. The challenge of switching to English as the medium of publicatio...

  14. Italian Journal of Animal Science - Presentation

    Directory of Open Access Journals (Sweden)

    Vincenzo Russo

    2010-01-01

    Full Text Available The publication of the first issue of the Italian Journal of Animal Science marks two important events for the Associazione Scientifica di Produzione Animale -ASPA- (Italian Scientific Association of Animal Production: the birth of a new scientific journal in English and the end of the publication in Italian of the remarkable journal Zootecnica e Nutrizione Animale, which was started in 1975, as the official organ of the Association.

  15. Italian Journal of Animal Science - Presentation

    OpenAIRE

    Vincenzo Russo

    2010-01-01

    The publication of the first issue of the Italian Journal of Animal Science marks two important events for the Associazione Scientifica di Produzione Animale -ASPA- (Italian Scientific Association of Animal Production): the birth of a new scientific journal in English and the end of the publication in Italian of the remarkable journal Zootecnica e Nutrizione Animale, which was started in 1975, as the official organ of the Association.

  16. Why a new journal on animal science

    Directory of Open Access Journals (Sweden)

    Rosanna Scipioni

    2010-01-01

    Full Text Available The publication of the first issue of the Italian Journal of Animal Science marks two important events for the Associazione Scientifica di Produzione Animale -ASPA- (Italian Scientific Association of Animal Production: the birth of a new scientific journal in English and the end of the publication in Italian of the remarkable journal Zootecnica e Nutrizione Animale, which was started in 1975, as the official organ of the Association.

  17. Why a new journal on animal science

    OpenAIRE

    Rosanna Scipioni

    2010-01-01

    The publication of the first issue of the Italian Journal of Animal Science marks two important events for the Associazione Scientifica di Produzione Animale -ASPA- (Italian Scientific Association of Animal Production): the birth of a new scientific journal in English and the end of the publication in Italian of the remarkable journal Zootecnica e Nutrizione Animale, which was started in 1975, as the official organ of the Association.

  18. Electronic Journals: A New Dimension To Research

    OpenAIRE

    Maham Zaman

    2012-01-01

    The latest discovery in the field of writing has been the “electronic publication”. This mode of publication is now being used in all fields of research. Easily accessible, these electronic journals (e-journals) are available worldwide through the internet. Studies have been conducted to verify whether this entity is beneficial or harmful to the field of research.Thus electronic journals are a new dimension to research.They not only ease the publications process but also improve its worldwid...

  19. Statistical Trends in Family Medicine Journals

    OpenAIRE

    Kwon, Hae-Jin; Park, Yong-Gyu

    2012-01-01

    Background This study proposed a desirable direction for the future development of the Korean Journal of Family Medicine (KJFM) by comparing with the overseas SCI journals, Family Medicine (FM) and The Journal of Family Practice (JFP) based on the statistical viewpoints. Methods All of the original articles published in KJFM from January 1981 to June 2011, FM from January 1998 to June 2011, and JFP from January 1978 to June 2011, were reviewed and compared in terms of content, data size, rese...

  20. The Crop Journal Calls for Papers

    Institute of Scientific and Technical Information of China (English)

    2015-01-01

    <正>We would like to invite you to submit your latest research accomplishments to The Crop Journal(ISSN:2095-5421;Online ISSN:2214-5141,CN 10-1112/S),a new bimonthly academic journal co-sponsored by the Crop Science Society of China and the Institute of Crop Science,Chinese Academy of Agricultural Sciences.The Crop Journal is freely available online(Open Access)in ScienceDirect.The Editor-in-Chief

  1. The Crop Journal Calls for Papers

    Institute of Scientific and Technical Information of China (English)

    2014-01-01

    <正>We would like to invite you to submit your latest research accomplishments to The Crop Journal(ISSN:2095-5421;Online ISSN:2214-5141,CN 10-1112/S),a new bimonthly academic journal co-sponsored by the Crop Science Society of China and the Institute of Crop Science,Chinese Academy of Agricultural Sciences.The Crop Journal is freely available online(Open Access)in ScienceDirect.The Editor-in-Chief of

  2. The Crop Journal Calls for Papers

    Institute of Scientific and Technical Information of China (English)

    2013-01-01

    <正>We would like to invite you to submit your latest research accomplishments to The Crop Journal(ISSN:2095-5421;Online ISSN:2214-5141,CN 10-1112/S),a new bimonthly academic journal co-sponsored by the Crop Science Society of China and the Institute of Crop Science,Chinese Academy of Agricultural Sciences.The Crop Journal is freely available online(Open Access)in ScienceDirect.

  3. The Crop Journal Calls for Papers

    Institute of Scientific and Technical Information of China (English)

    2014-01-01

    <正>We would like to invite you to submit your latest research accomplishments to The Crop Journal(ISSN:2095-5421;Online ISSN:2214-5141,CN 10-1112/S),a new bimonthly academic journal co-sponsored by the Crop Science Society of China and the Institute of Crop Science,Chinese Academy of Agricultural Sciences.The Crop Journal is freely available online(Open Access)in ScienceDirect.

  4. Media and Communication: Why Another Journal?

    OpenAIRE

    Bradley S. Greenberg; Hannes Haas; Elisabeth Klaus

    2013-01-01

    Indeed, there are some three dozen English-language journals now that deal with one or another or multiple aspects of the field of media and (mass) communication. Would another journal not be redundant? We think not. Media and Communication, henceforth shortened to MaC, will possess a specific combination of attributes that are not replicated elsewhere and together result in the unique position of the journal.

  5. Annual Journal citation indices: a comparative study

    OpenAIRE

    Khaleque, Abdul; Chatterjee, Arnab; Sen, Parongama

    2016-01-01

    We study the statistics of citations made to the indexed Science journals in the Journal Citation Reports during the period 2004-2013 using different measures. We consider different measures which quantify the impact of the journals. To our surprise, we find that the apparently uncorrelated measures, even when defined in an arbitrary manner, show strong correlations. This is checked over all the years considered. Impact factor being one of these measures, the present work raises the question ...

  6. Heuristic explanation of journal bearing instability

    Science.gov (United States)

    Crandall, S. H.

    1982-01-01

    A fluid-filled journal bearing is viewed as a powerful pump circulating fluid around the annular space between the journal and the bearing. A small whirling motion of the journal generates a wave of thickness variation progressing around the channel. The hypothesis that the fluid flow drives the whirl whenever the mean of the pumped fluid velocity is greater than the peripheral speed of the thickness variation wave is discussed and compared with other simple explanations of journal bearing instability. It is shown that for non-cavitation long bearings the hypothesis predicts instability onset correctly for unloaded bearings but gradually overpredicts the onset speed as the load is increased.

  7. Editorial-A brief journal status update.

    Science.gov (United States)

    Lynch, James F

    2016-05-01

    In this editorial, the Editor-in-Chief of the Journal of the Acoustical Society of America gives a brief overview of the present status of the Journal, emphasizing the events that have occurred over the past one and one half years. Topics addressed include: (1) The recent transition to the Editorial Manager peer review system, (2) new features that have been implemented in the Journal, (3) the incoming Managing Editor, (4) the publications component of the Acoustical Society's Strategic Plan, (5) new and revived article types, (6) open access, and (7) Journal metrics and statistics. PMID:27250160

  8. Welcome to the Journal of Daylighting

    OpenAIRE

    Irfan Ullah

    2014-01-01

    I am delighted to welcome you to a newly launched Solarlits electronic journal: the Journal of Daylighting (JD). As the Editor-in-Chief of JD it is a great pleasure to introduce the inaugural issue of this new, open-access, bi-annual journal to readers, researchers, future authors, and colleagues. The decision by SolarLits to launch this new journal is very timely. Because the growth of lighting demand is increasing due to rising average illuminance levels in buildings, more attention has bee...

  9. INIS: Authority list for journal titles

    International Nuclear Information System (INIS)

    This is the twenty-ninth revision of the INIS: Authority List for Journal Titles (IAEA-INIS-11). It lists the titles of 12 990 journals which have contained articles within the scope of INIS. The purpose of this report is to provide descriptive cataloguers with a standard entry for the full title of a journal. In addition to the full journal title, the ISSN (International Standard Serial Number), administered by the ISSN International Centre, Paris, France, and/or CODEN, assigned by Chemical Abstracts Service, USA, are given in this manual. In order to help the reader to find titles easily, the list is divided into two parts. In Part I, the full journal titles are grouped by country or international organization responsible for coverage and ordered alphabetically. In Part II, the full journal titles of all countries or international organizations are arranged alphabetically. The country name or the international organization name responsible for coverage of the journal title to INIS is entered in parentheses. Journal titles marked with an asterisk are regularly scanned by INIS. Titles that have been identified by INIS Centres as 'Key Journals' are marked with the hash sign

  10. Directory of Open Access Journals (DOAJ)

    OpenAIRE

    Morrison, Heather

    2008-01-01

    The Directory of Open Access Journals (DOAJ) is the world’s most authoritative list of scholarly, peer-reviewed, fully open access journals, and a “must” for libraries of all types. As of August 2007, DOAJ includes over 2,800 titles, over 10% of the world’s estimated 20-25,000 peer-reviewed scholarly journal titles. This is an impressive list; in terms of numbers of titles, DOAJ compares favorably with commercial journal packages. DOAJ is growing rapidly, at a rate of more than one title pe...

  11. Computational Materials Program for Alloy Design

    Science.gov (United States)

    Bozzolo, Guillermo

    2005-01-01

    The research program sponsored by this grant, "Computational Materials Program for Alloy Design", covers a period of time of enormous change in the emerging field of computational materials science. The computational materials program started with the development of the BFS method for alloys, a quantum approximate method for atomistic analysis of alloys specifically tailored to effectively deal with the current challenges in the area of atomistic modeling and to support modern experimental programs. During the grant period, the program benefited from steady growth which, as detailed below, far exceeds its original set of goals and objectives. Not surprisingly, by the end of this grant, the methodology and the computational materials program became an established force in the materials communitiy, with substantial impact in several areas. Major achievements during the duration of the grant include the completion of a Level 1 Milestone for the HITEMP program at NASA Glenn, consisting of the planning, development and organization of an international conference held at the Ohio Aerospace Institute in August of 2002, finalizing a period of rapid insertion of the methodology in the research community worlwide. The conference, attended by citizens of 17 countries representing various fields of the research community, resulted in a special issue of the leading journal in the area of applied surface science. Another element of the Level 1 Milestone was the presentation of the first version of the Alloy Design Workbench software package, currently known as "adwTools". This software package constitutes the first PC-based piece of software for atomistic simulations for both solid alloys and surfaces in the market.Dissemination of results and insertion in the materials community worldwide was a primary focus during this period. As a result, the P.I. was responsible for presenting 37 contributed talks, 19 invited talks, and publishing 71 articles in peer-reviewed journals, as

  12. PEACE JOURNALISM AS A PRODUCT OF TOTAL EFFORT

    OpenAIRE

    SAYGIN, Arda Umut; Ozan KOCABAŞ

    2015-01-01

    Dealing with the concept of peace and peace journalism in this study, peace journalism is discussed over its opposition relation with war journalism. In this article, it is addressed the obstacles of peace journalism although it is seen as the ideal journalism and is demonstrated that these obstacles are opportunities for peace journalism as well. In this article, while acknowledging the role of media in peace building, it is asserted that both peace and peace journalism is come true after ov...

  13. What Happens at the Journal Office Stays at the Journal Office: Assessing Journal Transparency and Record-Keeping Practices

    Science.gov (United States)

    Yoder, Stephen; Bramlett, Brittany H.

    2011-01-01

    Dissemination of journal submission data is critical for identifying editorial bias, creating an informed scholarly marketplace, and critically mapping the contours of a discipline's scholarship. However, our survey and case study investigations indicate that nearly a decade after the Perestroika movement began, political science journals remain…

  14. Hypothetical influence of non-indexed Spanish journals on the impact factor of radiological journals

    Energy Technology Data Exchange (ETDEWEB)

    Miguel-Dasit, Alberto [MR Section, La Plana de Vila-Real Hospital, Castellon (Spain); Aleixandre, Rafael [Institute of History of Science and Documentation Lopez Pinero, University of Valencia-CSIC, Valencia (Spain); Valderrama, Juan C. [Institute of History of Science and Documentation Lopez Pinero, University of Valencia-CSIC, Valencia (Spain); Marti-Bonmati, Luis [Department of Radiology, MR Section, Dr. Peset University Hospital, Avenida Gaspar Aguilar 90, E-46017 Valencia (Spain)]. E-mail: marti_lui@gva.es; Sanfeliu, Pilar [Cardenal Herrera-CEU University, Alfara, Valencia (Spain)

    2005-06-01

    Objective: The aim of this study was to analyze the hypothetical changes in the 2001 impact factor of 52 radiological journals included in the Science Citation Index-Journal Citation Reports by also counting cites proceeding from 73 Spanish journals on different medical specialties. Also, to estimate the possible impact factor of the official Spanish radiology journal, Radiologia, not included in this database. Materials and methods: A modified 2001 impact factor of 52 radiological journals and Radiologia was obtained by adding the number of cites in 1999 and 2000 from the medical Spanish journals. Data were obtained by consulting the 2001 edition of the Journal Citation Reports in the 'Web of Science' database. Results: The 16,985 bibliographical references were analysed (232 of them to radiological journals). The journal with the largest increase in its 2001 impact factor (from 1.83 to 1.90) was Radiologic Clinics of North America. European Journal of Radiology was the European journal with the highest increase (from 1.084 to 1.110) in the difference between the 2001 modified and original impact factor. The modified 2001 impact factor of the 34 American journals was statistically higher (P = 0.016) than that of the 18 European journals (1.64 versus 0.93). Differences between the 2001 modified and original impact factor were slightly higher in the American journals (no statistically significant difference). The 2001 impact factor of Radiologia was 0.056. Discussion: Differences between the 2001 original and modified impact factor were small, but larger in the American journals. The 2001 impact factor of Radiologia was modest, although similar to other publications included in the Journal Citation Reports.

  15. Open Access Journals with a view of journals covered in ISI

    OpenAIRE

    Mohammad Karim Saberi

    2009-01-01

    Due to diversity and quick dissemination of information, journals have a higher number of audience when compared with other information carriers. Nevertheless with the emerging new information technologies have contributed to the appeal and thriving of journals, Open Access Journals in particular. The present paper intends initially to discuss the open access movement that gave rise to the emergence of open access journals. It would then introduce modes of open access as well as the character...

  16. Investigation of SCI Journal Selection Process for the Journals of Korean Traditional Medicine

    OpenAIRE

    Hyundo Kim; Taesik Kang; Ki-Rok Kwon

    2003-01-01

    The purpose of this study is to investigate and analyze the selection process of the Science Citation Index(SCI). SCI has been the benchmarking medium of scientific journals for over 40 years by reviewing thousands of journals published each year. The discipline of Traditional Oriental Medicine has been gaining global interest in recent years, yet the number of related journals indexed by SCI has been minimal. Korean Medicine has been producing number of quality journals for decades, but lack...

  17. Redesigning journal club in residency

    Science.gov (United States)

    Al Achkar, Morhaf

    2016-01-01

    The gap between production and implementation of knowledge is the main reason for the suboptimal quality of health care. To eliminate this gap and improve the quality of patient care, journal club (JC) in graduate medical education provides an opportunity for learning the skills of evidence-based medicine. JC, however, continues to face many challenges mainly due to poorly defined goals, inadequate preparation, and lack of interest. This article presents an innovative model to prepare and present JC based on three pillars: dialogical learning through group discussion, mentored residents as peer teachers, and including JC as part of a structured curriculum to learn evidence-based medicine. This engaging model has the potential to transform JC from a moribund session that is daunting for residents into a lively discussion to redefine clinical practice using the most current evidence.

  18. Redesigning journal club in residency.

    Science.gov (United States)

    Al Achkar, Morhaf

    2016-01-01

    The gap between production and implementation of knowledge is the main reason for the suboptimal quality of health care. To eliminate this gap and improve the quality of patient care, journal club (JC) in graduate medical education provides an opportunity for learning the skills of evidence-based medicine. JC, however, continues to face many challenges mainly due to poorly defined goals, inadequate preparation, and lack of interest. This article presents an innovative model to prepare and present JC based on three pillars: dialogical learning through group discussion, mentored residents as peer teachers, and including JC as part of a structured curriculum to learn evidence-based medicine. This engaging model has the potential to transform JC from a moribund session that is daunting for residents into a lively discussion to redefine clinical practice using the most current evidence. PMID:27313486

  19. A Modest Proposal: One Way to Save Journalism and Journalism Education

    Science.gov (United States)

    John, Jeffrey Alan

    2013-01-01

    This essay suggests that because anyone and everyone can now be a "journalist," the standards of the field of journalism have been greatly diminished. To regain respect for the profession and retain stature in the academy, journalism education should offer an assurance of the legitimacy of journalism program graduates by recognizing only…

  20. Translating VDM to Alloy

    DEFF Research Database (Denmark)

    Lausdahl, Kenneth

    2013-01-01

    specifications. However, to take advantage of the automated analysis of Alloy, the model-oriented VDM specifications must be translated into a constraint-based Alloy specifications. We describe how a sub- set of VDM can be translated into Alloy and how assertions can be expressed in VDM and checked by the Alloy...

  1. Is journalism failing on climate?

    Science.gov (United States)

    Rahmstorf, Stefan

    2012-12-01

    How can we build a reliable and affordable energy supply based on renewables? How rapidly do we need to cut greenhouse gas emissions to keep climate change within manageable bounds? What does it take to maintain a stable common currency of different nations? These are just a few examples of questions that are critical for our future and that require an understanding of complex systems—the energy system, the climate system, the financial system. Finding sound answers to these questions requires sophisticated scientific analysis and expert knowledge; a lay person's intuition will clearly not suffice. Yet, decisions in a democracy are (and should be!) taken by politicians and the voting public who are not usually scientific experts. Hence the well-being of our societies—and even more so the living conditions of future generations, which are defined by the decisions we take today—depends on the wider public being well informed about the state of scientific knowledge and discourse. The media are the most important means by which lay people obtain their information about science. Good science journalism is therefore a decisive factor for the long-term success of modern society. Good science journalism clearly must be critical journalism, and it requires journalists who know what is what, who can put things into a perspective, and who are able to make well-informed judgements. After all, the role of science journalism is not simply to act as a 'translator' who conveys the findings of scientists in a language understandable to lay people. Rather, good science journalism will provide the public with a realistic impression of what is well established in science and what are current 'hot topics', uncertainties and controversies. It will also discuss the methods and social context of the scientific endeavour. There is ample evidence that in the area of climate science, journalism too often is failing to deliver this realistic picture to its audience, despite many good

  2. New journal: Journal of Problem Based Learning in Higher

    Directory of Open Access Journals (Sweden)

    Thomas Ryberg

    2012-07-01

    Full Text Available Kære kolleger Hermed en kort notits om, at der netop er blevet lanceret en ny international open access journal, som har stærke rødder i dansk uddannelsestradition og forskning og dermed også skulle have bred interesse for flere danske forsknings- og uddannelsesmiljøer. Tidsskriftet hedder ’Journal of Problem Based Learning in Higher Education’ og er således specielt dedikeret til forskningsartikler, der vedrører de lange og mellemlange videregående uddannelser. Tidsskriftets fokus er Problem Based Learning, eller det, der i en dansk kontekst, kendes bedre som problemorienteret projektarbejde/projektpædagogik. Begrebet Problem Based Learning/Problembaseret Læring kan dog også forstås bredere som en mere studenter-centreret pædagogik, hvor der i forbindelse med kurser tages udgangspunkt i og arbejdes med problemer som udgangspunkt for læring; hvor der arbejdes med cases, eller hvor de studerende aktiveres gennem f.eks. projektforløb. De mere specifikke fokus- og interesseområder kan man dog læse mere om i den vedhæftede flyer, som alle er velkomne til at cirkulere til evt. interesserede kolleger. Særlig interessant for læsere og forfattere i LOM er naturligvis, at redaktionen er interesserede i artikler, der involverer brugen af IKT og medier i forbindelse med Problembaseret Læring og problemorienteret projektarbejde. Vi forestiller os, at artikler udgivet i LOM, der omhandler dette, med fordel kunne viderebearbejdes til et internationalt publikum. Man kan læse mere, om tidskriftet, fokus og guidelines på adressen: http://ojs.statsbiblioteket.dk/index.php/pbl Vi håber at mange af LOMs læsere og forfatter også vil være interesseret i dette nye tidsskrift, og hvis nogle skulle have spørgsmål eller kommentarer er de velkomne til at kontakte: Thomas Ryberg (ryberg@hum.aau.dk

  3. Northeastern Mathematical Journal Aims and Scope

    Institute of Scientific and Technical Information of China (English)

    2004-01-01

    Northeastern Mathematical Journal (NMJ) is a comprehensive mathematical journal carrying original papers on pure and applied mathematics. It started publication in September, 1985, and appears quarterly. The primary purpose is to present latest achievements in mathematical research and to promote national and international academic exchange.

  4. Northeastern Mathematical Journal Aims and Scope

    Institute of Scientific and Technical Information of China (English)

    2005-01-01

    Northeastern Mathematical Journal (NMJ) is a comprehensive mathematical journal carrying original papers on pure and applied mathematics. It started publication in September, 1985, and appears quarterly. The primary purpose is to present latest achievements in mathematical research and to promote national and international academic exchange, The Editorial Committee of NMJ consists of 49 members from different parts and units of China.

  5. Patterns of Use of Electronic Journals.

    Science.gov (United States)

    Eason, Ken; Richardson, Sue; Yu, Liangzhi

    2000-01-01

    Classifies a spectrum of user behavior with electronic journals based on transaction log analysis of SuperJournal and K-Means cluster analysis. Describes results of user interviews and questionnaires from 13 United Kingdom higher education institutions that showed content and ease of use were the most significant factors affecting patterns of use.…

  6. The Academic Journal: Has it a Future?

    Directory of Open Access Journals (Sweden)

    Gaby Weiner

    2001-03-01

    Full Text Available This article examines the current state of the academic journal. It does so for a number of reasons: the increasing expense of paper journals; the advent of electronic publishing; the use of publication in journals as an indicator of research quality (in addition to disseminating knowledge within a discipline and consequent criticisms of systems of peer review and evaluation of scholarship; emergent issues of equity and access; and evidence of malpractice. These issues taken together constitute a critique of, and challenge to, the process whereby research papers become journal articles, which has in the past been viewed as unproblematic and straightforward. This paper brings together a wide range of literature in order to inform discussion about the future of the academic journal. It briefly examines the origins of the academic journal and then provides a comprehensive overview of current debates concerning how academic journals work today. In so doing, it raises questions about decisions that will need to be taken regarding the continuity or otherwise of the conventional academic journal, and how publishing practices may change in the future.

  7. Using Dialogue Journals to Focus on Form

    Science.gov (United States)

    Linnell, Kimberly Miller

    2010-01-01

    Dialogue journals have been used in a wide range of educational settings for quite some time. These written conversations between teachers and students are especially well suited for the ESL classroom. This article describes how many of the conditions known to foster second language acquisition are inherent in the dialogue journal. Traditionally,…

  8. Broadcast Journalism Education and the Capstone Experience

    Science.gov (United States)

    Tanner, Andrea; Forde, Kathy Roberts; Besley, John C.; Weir, Tom

    2012-01-01

    This study assesses the current state of the television news capstone experience in accredited journalism and mass communication programs in the United States. Specifically, the authors employed a mixed-methods approach, interviewing 20 television news capstone instructors and conducting an analysis of broadcast journalism curriculum information…

  9. Social media and journalism study 2013 - Sweden

    OpenAIRE

    Pole, K.; Gulyás, A

    2013-01-01

    This report is part of the wider 2013 social journalism study and reports specifically on Sweden. It suggests that journalists in Sweden are a moderately high user of social media, using it regularly for their work particularly for sourcing stories. Using cluster analysis the largest group is the Architects suggesting that journalism in Sweden is dominated by active social media users.

  10. Thematic review of family therapy journals 2011

    OpenAIRE

    Carr, Alan.

    2012-01-01

    In this article the contents of the principal English-language family therapy journals published in 2011 are reviewed under these headings: child-focused problems, adult-focused problems, couples therapy, medical family therapy, military family therapy, theory, research, training, the new Journal of Couple and Family Psychology and Human Systems twenty-first anniversary. peer-reviewed

  11. Job Satisfaction of High School Journalism Educators.

    Science.gov (United States)

    Dvorak, Jack; Phillips, Kay D.

    Four research questions are posed to explore the job satisfaction of high school journalism educators. A national random sample of 669 respondents shows that journalism educators are generally satisfied with their jobs--more so than teachers in other disciplines. Multiple regression analysis using Herzberg's motivation-hygiene theory as a…

  12. Electrochemical Journals, AIP's Scitation, Cost-Effectiveness

    OpenAIRE

    Roth, Dana L.

    2004-01-01

    A review of the relative subscription costs, page & article counts of Electrochemical Society journals compared with commercial counterparts. A description of the AIP's Scitation database. The relative cost-effectiveness (normalized cost/article/Impact Factor) of society and commercial journals related to electrochemistry.

  13. The Moral Education of Journal Editors

    Science.gov (United States)

    Krimsky, Sheldon

    2010-01-01

    Refereed journals in science and medicine are the gatekeepers and repositories of knowledge in their respective fields. Research reported in peer-reviewed journals builds professional careers, determines which drugs and medical devices are licensed, influences what medical treatments become standards of care, and establishes the veracity of…

  14. Foreword to Journal of Geographical Sciences

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    @@In order to strengthen academic exchange of geography between China and other countries,and to offer a publication for exchanging academic ideas of geog-raphers in the world,The Journal of AChinese Geog-raphyis changed to Journal of Geographical Sciences in 2001.

  15. Electronic Journals, the Internet, and Scholarly Communication.

    Science.gov (United States)

    Kling, Rob; Callahan, Ewa

    2003-01-01

    Examines the role of the Internet in supporting scholarly communication via electronic journals. Topics include scholarly electronic communication; a typology of electronic journals; models of electronic documents and scholarly communication forums; publication speed; costs; pricing; access and searching; citations; interactivity; archiving and…

  16. "Dear Diary" Revisited: Reflecting on Collaborative Journaling

    Science.gov (United States)

    Mackenzie, Catrina A.; Ricker, Britta; Christensen, Julia; Heller, Elizabeth; Kagan, Emily; Osano, Philip M.; Long, Lindsay; Turner, Sarah

    2013-01-01

    The genesis of this article was a request from the "Journal of Geography in Higher Education" to provide a reflection piece about our article 'Dear Diary: Early Career Geographers Collectively Reflect on their Qualitative Field Research Experiences' (2011) that won the journal's biennial award for 2009-2011. This request…

  17. DPJ Editorial: Launching the new journal

    Directory of Open Access Journals (Sweden)

    Eugene Matusov

    2013-01-01

    Full Text Available We welcome and invite new readers, authors, reviewers and editors to the new journal.  A short history of the journal foundation is given along with the reasons for launching this publication. A long, but not finished, list is provided of important and interesting themes and areas of interest for dialogic educational practice, research and theory.

  18. Making the Introductory Journalism Class Tick.

    Science.gov (United States)

    Dorway, Tim

    2003-01-01

    Proposes that beginning journalism classes teach multiple skills, including law, decision-making, interpersonal communication, interviewing, and critical thinking. Outlines how to convince administrators of the need for beginning journalism classes, and how to develop an effective class. Lists philosophy and course goals for one such class. (PM)

  19. Professional Academic Development through Professional Journal Dialogue

    Science.gov (United States)

    Ruth, Damian; Naidoo, Kogi

    2012-01-01

    This paper presents the cooperative analysis by a lecturer and an academic development practitioner of a reflective journal dialogue over the 12 weeks of teaching a postgraduate course. Through a retrospective analysis of the journal the present paper explores the following issues: the framing of an inquiry; the personal-professional nexus; and…

  20. The vented pressure fed gas journal bearing

    International Nuclear Information System (INIS)

    Hydrodynamic-type gas journal bearings with stabilising venting slots are often operated hydrostatically during starting-up as a means of 'jacking'. A simplified mathematical treatment of the circumferential gas flows in a vented, pressure-fed journal bearing is used to predict the relationship between load capacity, bearing geometry and gas properties. (author)

  1. Electronic Journal Delivery in Academic Libraries

    Science.gov (United States)

    Crothers, Stephen; Prabhu, Margaret; Sullivan, Shirley

    2007-01-01

    The authors recount experiences of the variety of problems and issues involved in providing access to electronic journals in a large academic library. The paper excludes concerns emanating from decisions to subscribe to aggregations such as those produced by vendors like EBSCO, but concentrates on scholarly journals ordered individually, or as…

  2. Educational Technology Research Journals: "Instructional Science,"

    Science.gov (United States)

    Henrie, Curtis R.; Williams, Greg S.; West, Richard E.

    2013-01-01

    The authors analyzed all research articles published between 2002 and 2011 in the international journal "Instructional Science," with a goal to provide an understanding of the type of research being published in this journal, major contributing authors, and the most-cited publications of this time period. They examined research…

  3. Bibliometrics of electronic journals in information science

    Directory of Open Access Journals (Sweden)

    Donald T. Hawkins

    2001-01-01

    Full Text Available The bibliometric characteristics of electronic journals (e-journals covering the field of information science have been studied. Twenty-eight e-journals were identified and ranked by number of articles on the subject they published. A Bradford plot revealed that the core is not well developed yet, but it will likely contain six journals. The publication of information science articles in e-journals began modestly in 1995 with 26 articles, but it has risen to approximately 250 articles per year. The most prolific authors are identified. The vast majority of them are located in the United States or United Kingdom. Only 26 articles have authors from more than one country, showing that electronic technology has not yet strongly influenced international collaboration. About 2/3 of the articles originate in academic institutions. Common topics of e-journal articles in information science include electronic information, electronic publishing, virtual (digital libraries, information search and retrieval, and use of the Internet. Seven online databases cover these e-journals; Information Science Abstracts is the only one to cover all 28 journals, and it has the highest number of abstracts from them - over 1,100.

  4. Fostering Preservice Reflection through Response Journals

    Science.gov (United States)

    Lee, Icy

    2008-01-01

    Journal writing is a kind of reflective writing that requires prospective teachers to construct knowledge through questioning their own assumptions about teaching and learning, and hence in line with the general direction of education reform in Hong Kong. This article describes a study that uses response journals as a tool for fostering reflection…

  5. A Comprehensive Analysis of Marketing Journal Rankings

    Science.gov (United States)

    Steward, Michelle D.; Lewis, Bruce R.

    2010-01-01

    The purpose of this study is to offer a comprehensive assessment of journal standings in Marketing from two perspectives. The discipline perspective of rankings is obtained from a collection of published journal ranking studies during the past 15 years. The studies in the published ranking stream are assessed for reliability by examining internal…

  6. Accuracy of References in Five Entomology Journals.

    Science.gov (United States)

    Kristof, Cynthia

    ln this paper, the bibliographical references in five core entomology journals are examined for citation accuracy in order to determine if the error rates are similar. Every reference printed in each journal's first issue of 1992 was examined, and these were compared to the original (cited) publications, if possible, in order to determine the…

  7. Translation Aestheticsand Communication Theory of Journalism English

    Institute of Scientific and Technical Information of China (English)

    陈曜

    2007-01-01

    This paper describes the present translation theories and standards especially in journalism English translation and imply these theories in my issue. Moreover, I will explain how to apply the translation aesthetics and communication theory of translation in the course of journalism English translation activities. So that translation will achieve elegance in English news text and its Chinese version as well.

  8. Examining Marketing Journals' Publication Process and Reviewer Practices

    Science.gov (United States)

    Seiler, Vicky L.; Reisenwitz, Timothy H.; Schibrowsky, John A.

    2011-01-01

    This study examines reviewer practices at 11 marketing journals. The results for the top three journals are compared to eight comparable journals that are typically considered to be non-top-tier journals. The results suggest that the reviewers and the review processes at the top journals differ significantly from those of the non-top-tier…

  9. Evaluating Academic Journals without Impact Factors for Collection Management Decisions.

    Science.gov (United States)

    Dilevko, Juris; Atkinson, Esther

    2002-01-01

    Discussion of evaluating academic journals for collection management decisions focuses on a methodological framework for evaluating journals not ranked by impact factors in Journal Citation Reports. Compares nonranked journals with ranked journals and then applies this framework to a case study in the field of medical science. (LRW)

  10. Journalism and Media Crossing Field Boundaries

    DEFF Research Database (Denmark)

    Svith, Flemming

    . This article explores such changes in Denmark by using key concepts of the French sociologist Pierre Bourdieu in a historical study of media and journalism in the last four decades. Based on data of journalist functions in society and the emergence and distribution of new types of media, combined......Journalism and media have been fitted together for decades fulfilling each other needs. However, due to some main drivers as new communication technology and the societal medialization process media and journalism have changed dramatically and in the case of Denmark this symbiosis is broken...... with the positioning of media and journalists and the existing knowledge in the media and journalism literature, this paper analyze media and journalism as two distinct analytic objects representing respectively media organization and the journalist profession. Firstly, this paper thus constructs synchronic...

  11. MARKET CONCENTRATION IN TURKISH JOURNALISM SECTOR

    Directory of Open Access Journals (Sweden)

    ADEM KALÇA

    2013-05-01

    Full Text Available Concentration is a situation in which market structure of a sector is controlled by a few firms. At the present time, many analyzing methods such as Herfindahl-Hirschman and N-Firm Concentration Indexes are used to determine market structure.According to market concentration indexes, higher concentration level means more monopolistic market structure, lower concentration level means more full competitive market structure. In this study concentration levels of media groups in Turkish journalism sector within the scope of traditional journalism and internet journalism was analyzed via N-Firm Concentration and H-H Indexes. As a result of the study, it’s seen that first four biggest media groups have monopolistic competition in internet journalism sector,and oligopol structure in traditional journalism sector. According to H-H index analyze, there is monopolistic competition in the sector.

  12. Measuring contextual citation impact of scientific journals

    CERN Document Server

    Moed, Henk F

    2009-01-01

    This paper explores a new indicator of journal citation impact, denoted as source normalized impact per paper (SNIP). It measures a journal's contextual citation impact, taking into account characteristics of its properly defined subject field, especially the frequency at which authors cite other papers in their reference lists, the rapidity of maturing of citation impact, and the extent to which a database used for the assessment covers the field's literature. It further develops Eugene Garfield's notions of a field's 'citation potential' defined as the average length of references lists in a field and determining the probability of being cited, and the need in fair performance assessments to correct for differences between subject fields. A journal's subject field is defined as the set of papers citing that journal. SNIP is defined as the ratio of the journal's citation count per paper and the citation potential in its subject field. It aims to allow direct comparison of sources in different subject fields....

  13. New journals for publishing medical case reports

    Science.gov (United States)

    Akers, Katherine G.

    2016-01-01

    Because they do not rank highly in the hierarchy of evidence and are not frequently cited, case reports describing the clinical circumstances of single patients are seldom published by medical journals. However, many clinicians argue that case reports have significant educational value, advance medical knowledge, and complement evidence-based medicine. Over the last several years, a vast number (∼160) of new peer-reviewed journals have emerged that focus on publishing case reports. These journals are typically open access and have relatively high acceptance rates. However, approximately half of the publishers of case reports journals engage in questionable or “predatory” publishing practices. Authors of case reports may benefit from greater awareness of these new publication venues as well as an ability to discriminate between reputable and non-reputable journal publishers. PMID:27076803

  14. Physical Review: a family of journals

    Science.gov (United States)

    Sprouse, Gene

    2013-03-01

    The expansion of research in physics in the last 100 years has been reflected in the expansion of the Physical Review(PR). Reviews of Modern Physics was the first ``new'' journal, starting in 1929. Physical Review Letters commenced in 1958, and was the first ``letters'' type of journal for important new results in all fields. By 1970 the Physical Review itself had grown so large that it was necessary to separate it by field into manageable volumes: PRA, PRB, PRC and PRD, and subsequently PRE, which was split off from PRA. More recently, two Special Topics journals for accelerator physics and physics education were pioneers of the open access business model, and the newest member of the family, Physical Review X, continues this trend. PRX is broad scope and very selective, setting it well above many of the new open access journals with a review standard of ``not incorrect.'' Some possible future directions for the Physical Review journals will be discussed.

  15. Publishing scientific journals in the digital age: opportunities for small scholarly journals.

    Science.gov (United States)

    Marušić, Ana

    2014-01-01

    Scientific publishing is rapidly developing from print-only to digital journals and extensive use of social media. This essay presents our experience in developing a small and scholarly journal from the so-called scientific semi-periphery and using the advantages of digital publishing to increase the visibility of the journal in international indexing and citation databases, and ensure greater visibility in the global scientific community. An editor of a scientific journal does not need to master all details of different digital publishing tools, but needs to follow the developments so that they can be best implemented in the journal. PMID:25711217

  16. How far has The Korean Journal of Internal Medicine advanced in terms of journal metrics?

    OpenAIRE

    Huh, Sun

    2013-01-01

    The Korean Journal of Internal Medicine has already been valued as an international journal, according to a citation analysis in 2011. Now, 2 years later, I would like to confirm how much the Journal has advanced from the point of view of journal metrics by looking at the impact factor, cites per document (2 years), SCImago Journal Rank (SJR), and the Hirsch index. These were obtained from a variety of databases, such as the Korean Medical Citation Index, KoreaMed Synapse, Web of Science, JCR...

  17. Developing Qualitative Indicators for Journal Evaluation: Case Study of Library Science Journals of SAARC Countries

    Directory of Open Access Journals (Sweden)

    Priyanka Vishwakarma,

    2014-03-01

    Full Text Available The purpose of this paper was to identify the existing criteria of various conventional databases that are considered in evaluating journals in the scholarship of library & information science (LIS journals and accordingly developed a tool box to evaluate some selected journals of LIS in South Asian Association of Regional Cooperation (SAARC countries. Journals have been evaluated by applying 30 criteria based on the current measures used by Thompson Reuter, SCOPUS, SciELO, LISA, LISTA, etc. The result indicates that although there are a considerable number of journals being published in India since long time, only a few journals are qualitatively strong. The review policy as mentioned in documentation, subject coverage can be considered as their strength, the geographic non-diversity of members in Editorial Board, contributors are their weakness. Most of journals are indexed in LISA and LISTA, however no journals are yet to include in JCR. Overall, to cope-up with international standard journals need to consider their publication policy thoroughly. The findings of the study seems to be useful for (a academics – to know the list of journals which adhere to the quality requirements of LIS discipline; (b librarians – to know the core LIS journals of SAARC countries in LIS discipline for their clients; (c policy makers – to measure the weightage of publication, while evaluating performance for career and promotion, to evaluate individual research performance, while releasing grants for academic projects.

  18. Concerned Journals, Editors And ICMJE

    Directory of Open Access Journals (Sweden)

    Ajai R. Singh

    2007-01-01

    Full Text Available This section will detail some important initiatives taken by journal editors in writing about industry influence on academia in particular and medicine in general. It will also look into the Revised Guidelines of the ICMJE vis-à-vis issues related to industry-sponsored research. Journals And Editors In the last chapter, we saw how conflict of interest related to individuals and institutions are discussed and resolved by AAMC. Conflict of interest because of industry's increasing clout has also engaged the attention of editors of important journals and some significant editorials in this connection are worth a close study by all concerned researchers and institutions, for they reflect reasoned responses to disturbing developments. The titles themselves reflect their concern:Is academic medicine for sale? (Angell, N Engl J Med , 2000Angell asks a piquant question of academic medical institutions:'Academic medical institutions are themselves growing increasingly beholden to industry. How can they justify rigorous conflict-of-interest policies for individual researchers when their own ties are so extensive?' Answering as to why Academia-industry connect flourishes, she says: 'Some academic institutions have entered into partnerships with drug companies to set up research centers and teaching programs in which students and faculty members essentially carry out industry research. Both sides see great benefit in this arrangement. For financially struggling medical centers, it means cash. For the companies that make the drugs and devices, it means access to research talent, as well as affiliation with a prestigious "brand." Asking herself the question: 'Why shouldn't clinical researchers have close ties to industry?' she answers it decisively tilts academia's inclinations to serve industry interests in various ways, rather than that of biomedical advance:'One obvious concern is that these ties will bias research, both the kind of work that is done and

  19. The Values of Journalism in the Digital Convergence: Civic Journalism and Fifth Power

    Directory of Open Access Journals (Sweden)

    Dra. Núria Almiron Roig

    2006-01-01

    Full Text Available Digital Convergence is having a big impact on the journalism profession. It alters the patterns of information production, information distribution and information consumption. For some, it’s also generating what could be called a new version of journalism, the civic journalism. All this has a direct impact on the credibility crisis suffered by traditional journalism. This paper tries to answer two questions. First, does digital convergence strengthen or weaken the values of journalism?; Second, do new technologies favour the creation and consolidation of a new journalism and of a Fifth Power or info-communicative platform, able to multiply information transparency by becoming the watcher of the watchers? According to the author, the current crisis of values of journalism will only have a chance to be overcame by protecting the professional practice, due to its social responsibility, or assuming the lost of its democratical function —altogether with the consequences that this may have on our sociopolitical systems.

  20. Alloyed steel

    International Nuclear Information System (INIS)

    The composition and properties are listed of alloyed steel for use in the manufacture of steam generators, collectors, spacers, emergency tanks, and other components of nuclear power plants. The steel consists of 0.08 to 0.11% w.w. C, 0.6 to 1.4% w.w. Mn, 0.35 to 0.6% w.w. Mo, 0.02 to 0.07% w.w. Al, 0.17 to 0.37% w.w. Si, 1.7 to 2.7% w.w. Ni, 0.03 to 0.07% w.w. V, 0.005 to 0.012% w.w. N, and the rest is Fe. The said steel showed a sufficiently low transition temperature between brittle and tough structures, a greater depth of hardenability, and better weldability than similar steels. (B.S.)

  1. INIS: Authority list for journal titles

    International Nuclear Information System (INIS)

    This is the 32nd revision of the INIS: Authority List for Journal Titles (IAEA-INIS-11). This list is published annually and includes the titles of all journals which have contained articles submitted to INIS at the time of publication. The current list contains 13,231 journal titles, 2,125 regularly scanned journals and 555 key journals. It was last updated in February 2006. The purpose of this report is to provide descriptive cataloguers with a standard entry for the full title of a journal. In addition to the full journal title, the ISSN (International Standard Serial Number), administered by the ISSN International Centre, Paris, France, and/or CODEN, assigned by Chemical Abstracts Service, USA, are given in this manual. In order to help the user find titles easily, the list is arranged in six parts, followed by summary statistics: In Part I, all key journals are grouped under the name of the country or international organization responsible for their input in INIS, then sorted alphabetically under their title. In Part II, all key journals are sorted alphabetically under their title. The name of the country or international organization responsible for their input in INIS is entered in parentheses within the body of the entry. In Part III, all journals that are regularly scanned by INIS Centres are grouped under the name of the country or international organization responsible for their input in INIS, then sorted alphabetically under their title. In Part IV, all journals that are regularly scanned by INIS Centres are sorted alphabetically under their title. The name of the country or international organization responsible for their input in INIS is entered in parentheses within the body of the entry. In Part V, all journals are grouped under the name of the country or international organization responsible for their input in INIS, then sorted alphabetically under their title. In Part VI, all journals are sorted alphabetically under their title. The name of the

  2. INIS: Authority list for journal titles

    International Nuclear Information System (INIS)

    This is the 31st revision of the INIS: Authority List for Journal Titles (IAEA-INIS-11). This list is published annually and includes the titles of all journals which have contained articles submitted to INIS at the time of publication. The current list contains 13,104 journal titles, 2,078 regularly scanned journals and 561 key journals. It was last updated in February 2005. The purpose of this report is to provide descriptive cataloguers with a standard entry for the full title of a journal. In addition to the full journal title, the ISSN (International Standard Serial Number), administered by the ISSN International Centre, Paris, France, and/or CODEN, assigned by Chemical Abstracts Service, USA, are given in this manual. In order to help the user find titles easily, the list is arranged in six parts, followed by summary statistics: In Part I, all key journals are grouped under the name of the country or international organization responsible for their input in INIS, then sorted alphabetically under their title. In Part II, all key journals are sorted alphabetically under their title. The name of the country or international organization responsible for their input in INIS is entered in parentheses within the body of the entry. In Part III, all journals that are regularly scanned by INIS Centers are grouped under the name of the country or international organization responsible for their input in INIS, then sorted alphabetically under their title. In Part IV, all journals that are regularly scanned by INIS Centers are sorted alphabetically under their title. The name of the country or international organization responsible for their input in INIS is entered in parentheses within the body of the entry. In Part V, all journals are grouped under the name of the country or international organization responsible for their input in INIS, then sorted alphabetically under their title. In Part VI, all journals are sorted alphabetically under their title. The name of the

  3. A Reproducible Journal Classification and Global Map of Science Based on Aggregated Journal-Journal Citation Relations

    OpenAIRE

    Leydesdorff, Loet; Bornmann, Lutz; Zhou, Ping

    2016-01-01

    A number of journal classification systems have been developed in bibliometrics since the launch of the Citation Indices by the Institute of Scientific Information (ISI) in the 1960s. The best known system is the so-called "Web-of-Science Subject Categories" (WCs). Each system has its own advantages and disadvantages. Using the Journal Citation Reports 2014 of the Science Citation Index and the Social Science Citation Index (n of journals = 11,149), we examine the options for developing an un...

  4. Review of theoretical conceptions on regimes of oxidation and hydrogen pickup in Zr-alloys

    International Nuclear Information System (INIS)

    In this paper the following issues are presented: 1) Experimental observations published in the journals on corrosion regimes of zirconium alloys of various compositions both for ex-pile oxidation experiments and for in-pile operating conditions of the materials. Factors experimentally stated on the effect of alloying composition, microstructure and texture on the rate of uniform corrosion and susceptibility of alloys to nodular corrosion. 2) Phenomenological models existing in publications, which describe conditions of uniform and nodular corrosion for Zr-alloys of various composition and microstructures, effect of irradiation and oxidizing medium; 3) Experimental data and phenomenological models describing regimes of hydrogen absorption in zirconium alloys; 4) Examples of application of physical models in explaining regimes, peculiarities of oxidation and hydrogen pickup for zirconium claddings of various alloying composition and microstructure

  5. Data compilation diffusion in ferrous alloys

    CERN Document Server

    Fisher, David J

    2006-01-01

    This issue comprises an extensive body of selected data, on diffusion in iron-based materials, gleaned from research published in leading journals during the past 70 years. The materials covered range from the almost-pure metal, to high-alloy steels (including metallic glasses) and the data reflect the effect of special conditions (thin films, strain, etc.) upon bulk, surface and pipe diffusion.This publication will constitute an invaluable first port-of-call for anyone looking for a quick guide as to the extent of diffusion which is to be expected to occur during any research project or indus

  6. General regulations about submitting manuscripts to Journal of Palaeogeography

    Institute of Scientific and Technical Information of China (English)

    2012-01-01

    <正>1. Journal of Palaeogeography is an academic earth science journal. The journal mainly publishes research results and original academic articles focusing on palaeogeography and relevant disciplines by both Chinese and foreign scholarsphysiogeographic palaeogeography

  7. High School Journalism Confronts Critical Deadline. A Report by the Journalism Education Association Commission on the Role of Journalism in Secondary Education.

    Science.gov (United States)

    Journalism Education Association.

    In cooperation with the American College Testing (ACT) Program, the Journalism in Education Association conducted a 2-year study to explore the status of high school journalism and, in particular, to determine factual data concerning the values of journalism in secondary education by comparing students with high school journalism/publication…

  8. June 2013 pulmonary journal club

    Directory of Open Access Journals (Sweden)

    Mathew M

    2013-06-01

    Full Text Available No abstract available. Article truncated at 150 words. National Lung Screening Trial Research Team, Church TR, Black WC, Aberle DR, Berg CD, Clingan KL, Duan F, Fagerstrom RM, Gareen IF, Gierada DS, Jones GC, Mahon I, Marcus PM, Sicks JD, Jain A, Baum S. Results of initial low-dose computed tomographic screening for lung cancer. N Engl J Med. 2013;368(21:1980-91. This paper serves as a follow up on the results of the first round of testing using low dose computed tomography in screening for lung cancer. A full review on the initial results can be referenced from the August 2011 Pulmonary Journal Club (1. The study was performed at 33 centers from 2002 – 2004. A total of 53454 patients were enrolled. Inclusion criteria were age 55-74 and a 30 pack-year smoking history. All patients were randomized to receive either low dose screening CT scan (LDCT or a chest x-ray. The results of the first year of screening showed that …

  9. Bibliometric Study of Infociencia Journal.

    Directory of Open Access Journals (Sweden)

    Yaima Martínez Viciedo

    2012-12-01

    Full Text Available Open Access of information has had great boom nowadays, meanwhile, some authors don’t want to disseminate their knowledge, making difficult the process mentioned before. Some Databases have being created to answer to this problem. Repositories and scientific magazines are other possibilities that the authors have to diffuse their knowledge. In this work it is made a bibliometric study of the electronic journal INFOCIENCIA during five years in which productivity of articles, the origin of bibliography, quantity of articles by themes and if the bibliography was update or not, were determined, for doing it an analysis of bibliometric character was made. It consisted on summarizing, reviewing, identifying and systematizing the obtained information by means of investigations. The obtained results were: The productivity of article has decreased during these five years, being 2008 the year of less production. The number of biographies varies in the evaluated period. The themes with more quantity of articles were: health, agriculture and education. It was proved that persons consulted more bibliography since 5 to 10 years, followed by the last 5 years.

  10. February 2013 pulmonary journal club

    Directory of Open Access Journals (Sweden)

    Mathew M

    2013-02-01

    Full Text Available No abstract available. Article truncated at 150 words. Effect of pressure support vs unassisted breathing through a tracheostomy collar on weaning duration in patients requiring prolonged mechanical ventilation: a randomized trial. Jubran A, Grant BJ, Duffner LA, Collins EG, Lanuza DM, Hoffman LA, Tobin MJ. JAMA. 2013;309(7:671-7. The rise in prolonged mechanical ventilation has fostered a growth in the need for long term acute care hospitals (LTACH. The February Journal Club reviewed the study looking at ventilator weaning through pressure support trials vs. spontaneous breathing through tracheostomy collar in a LTACH. The study was a randomized trial performed from 2000 - 2010. It was performed at a single long term acute care facility. Patients that required mechanical ventilation for > 21 days and failed a 5 day screening procedure of spontaneous breathing were included in the study. Included patients were randomized to either a pressure support or tracheostomy collar arm. 500 patients were screened, and a total of …

  11. Experiments in Creative Climate Journalism

    Science.gov (United States)

    Kintisch, E. S.

    2011-12-01

    Creative experiments in climate journalism are my aim during a one year fellowship at a university. The goal is to engage the audience's senses, mind, and hopefully, imagination in work about Earth's climate. The work is done in collaboration with students, artists, scientists, musicians and actors, all marshalled to explain how the warming planet works through engaging and innovative means. This session will feature video examples of using design or music to visualize climate data. A video using improvisational actors drinking Red Bull to bring the concept of climate sensitivity to life will be shown. A glossy card designed to spoof an airline safety instruction card will be displayed; its design explains geoengineering techniques and their risks. In doing this work I have benefitted from a fellowship at Massachusetts Institute for Technology, which has provided the precious gift of time and creative atmosphere. I am on leave from Science magazine. I will report on what has and hadn't worked in fostering new means of communicating science in an academic setting. The session will also explore the shifting role of the journalist in this new space. The challenges take me beyond simply using words as a medium between science and the public. I find myself as a convener or producer in engendering partnerships between scientists and great communicators like actors, sculptors or filmmakers.

  12. INIS: Authority list for journal titles

    International Nuclear Information System (INIS)

    This is the 35th revision of the INIS: Authority List for Journal Titles (IAEA-INIS-11). This list is published annually and includes the titles of all journals which have contained articles submitted to INIS at the time of publication. The current list contains 13 750 journal titles, 1 965 regularly scanned journals and 593 key journals. It was last updated in March 2009. A journal - or periodical - is a continuing publication issued in a succession of discrete parts, usually bearing numbering and/or chronological designations and intended to be continued indefinitely. It is generally published within a defined, fixed interval between issues and normally appears more than once per year. It includes a mixture of articles, letters, summaries, etc. Within this definition, annuals such as the Annual Review of Nuclear Science are included, but series titles such as the McGraw-Hill Series in Nuclear Engineering are not. The purpose of this document is to provide descriptive cataloguers with standard elements to include in bibliographic level 'S' of the INIS record. These elements include field (tag) 229 (Full Journal Title), 320 (ISSN) and 321 (CODEN). The full journal title is mandatory, and either the ISSN or the CODEN must be included (both may appear). Instructions on how to use this and other elements of the INIS record format are found in INIS: Guide to Bibliographic Description (IAEA-INIS-1). In order to help the user find titles easily, the list is arranged in six parts, followed by summary statistics: - In Part I, all key journals are grouped under the name of the country or international organization responsible for their input in INIS, then sorted alphabetically under their title. - In Part II, all key journals are sorted alphabetically under their title. The name of the country or international organization responsible for their input in INIS is entered in parentheses within the body of the entry. - In Part III, all journals that are regularly scanned by the

  13. Biomedical journals: keeping up and reading critically.

    Science.gov (United States)

    Chase, Karen L; DiGiacomo, Ronald F; Van Hoosier, Gerald L

    2006-09-01

    By extrapolation from studies of physicians, knowledge and practice of laboratory animal medicine and science are expected to become progressively more outdated the longer practitioners are out of school. Keeping up with current literature and practice is a challenge that necessitates the use of many different sources of continuing education. Both veterinarians and physicians consistently list journals as the most beneficial source of new information. Accordingly, they must select from the veterinary and biomedical literature articles that report original studies and systematic reviews and recognize and respond to valid new knowledge to improve diagnostic and therapeutic approaches and maintain consistent clinical skills. Other objectives include selecting journals for general information and for information relevant or specific to one's field of research. Lastly, candidates for board certification need to read articles from journals that potentially provide the basis for questions on the examination. 'High-impact' journals should be identified, and articles should be reviewed critically. In a survey of recent candidates for laboratory animal medicine board examination, these journals included Contemporary Topics (now JAALAS), Comparative Medicine, ILAR Journal, and Laboratory Animals. Strategies for coping with the challenge of staying current with the literature include wise use of technology, journal clubs, and consultation with colleagues. A laboratory animal practitioner can become a better scientist and clinician by evaluating the research performed by others. Thorough, critical review of biomedical literature is paramount to these goals. PMID:16995641

  14. Peripheral scholarly journals: From locality to globality

    Directory of Open Access Journals (Sweden)

    Françoise Salager-Meyer

    2015-11-01

    Full Text Available This critical literature review examines the problems faced by scholarly peripheral journals. Two categories of problems were identified. The first one refers to the deleterious effect the “publish-or-perish” mantra has on those journals, such as publication drain and the conduction of research that appeals to an international audience. The second category consists in problems that are related to the context in which these journals are published: lack of funds to run the journals, lack of competent editors and reviewers, problems related to publication ethics, endogamy, etc. The solution to overcome such problems is not to publish more and more journals in peripheral countries – which has been the tendency for the last ten years or so – but to upgrade local journals to global ones that should be published online in order to attract high-quality papers from both national and foreign authors. This would strengthen and enhance these journals visibility and international indexing. It would also increase the global influence of the research conducted in peripheral countries and bring global awareness to the specific scientific, social, cultural and economic features prevailing in such contexts.

  15. Properties of amorphous FeCoB alloy particles (abstract)

    DEFF Research Database (Denmark)

    Charles, S. W.; Wells, S.; Meagher, A.;

    1988-01-01

    Amorphous and crystalline alloy particles (0.05–0.5 nm) of FexCoyBz in which the ratio x:y ranges from 0 to 1 have been prepared by the borohydride reduction of iron and cobalt salts in aqueous solution. The structure of the particles has been studied using Mössbauer spectroscopy and x....... 1). It has been shown that the fraction of boron in the alloys (10–35 at. %) is dependent upon the rate of addition of salts to borohydride and the concentration of cobalt present; this in turn influences the crystallinity and magnetic properties . Journal of Applied Physics is copyrighted...

  16. Selection and evaluation of blood- and tribologically compatible journal bearing materials.

    Science.gov (United States)

    Murray, S F; Calabrese, S J; Malanoski, S B; Golding, L R; Smith, W A; Hamby, M

    1997-01-01

    A critical issue in the Cleveland Clinic Foundation (CCF) Innovative Ventricular Assist System (IVAS) blood pump is the selection of materials for the blood-lubricated journal bearing. Under normal operating conditions, the journal bearing geometry creates a thick blood film that separates the rotating and stationary surfaces. However, since start-up and certain transients could cause temporary contact, the material pair selected for these surfaces must be both tribologically and blood compatible. Combinations of two biocompatible alloys were tested: a titanium-zirconium-niobium alloy (Ti-13Zr-13Nb) and a zirconium-niobium alloy (Zr-2.5Nb). A standard pin-on-disk tester was used, with the contact surfaces lubricated by glycerol/saline mixtures simulating the viscosity range of blood. One test series evaluated start-up conditions; the other modeled a high-speed rub that might occur if the fluid film broke down. Results showed that the preoxidized Zr-2.5Nb pin/Ti-13Zr-13Nb disk combination was superior at all sliding velocities; a self-mated Zr-2.5Nb pair also showed promise. The oxide film on a self-mated Ti-13Zr-13Nb pair, and a Ti-13Zr-13Nb pin and Zr-2.5Nb disk combination did not show adequate wear life. More work remains to explain distinct performance differences of certain combinations, with more data needed on mechanical properties of thin, hard coatings on softer metal substrates. PMID:9360116

  17. Learning to teach data journalism: Innovation, influence and constraints

    OpenAIRE

    Hewett, J.

    2016-01-01

    Journalism education has tended to respond slowly to developments in digital journalism, such as data journalism, despite or because of close links with the industry. This paper examines the obstacles to innovation in journalism education with particular reference to data journalism, drawing on the literature, a review of stakeholders and course documents, and the author’s reflections on developing a data journalism module as part of a new MA programme. It highlights the complexities linked t...

  18. JOURNALISM STUDIES IN ARGENTINA: BACKGROUND AND QUESTIONS

    Directory of Open Access Journals (Sweden)

    Adriana Amado

    2014-06-01

    Full Text Available This article summarizes the background of empirical journalism studies in Argentina.  In recent publications, researchers have consistently underscored the lack of data on the profession and the scarce development of theoretical frameworks related to journalism studies.  The local investigations have prioritized approaches and methods that do not give the whole picture of the population of journalists. Most of the research tends to equate media analysis and media messages with journalism study and keeps on failing to provide data that allows for learning about the working conditions and the professional profile of the Argentinean journalists.

  19. What medical journal editing means to me

    Directory of Open Access Journals (Sweden)

    Harvey Marcovitch

    2008-01-01

    Full Text Available Papers in medical journals are often difficult to understand and tedious to read. An editor's first loyalty should be to readers, by prioritising readability over merely producing a repository of data for the scientific community generally.The web now provides infinite repository space so there is even less excuse for journals to be unreadable. I give examples of how I attempted to improve one journal, despite external pressures and regardless of how it might affect the Impact Factor. As a postscript I outline increasing involvement in promoting honesty and integrity in publishing through the auspices of the Committee on Publication Ethics (COPE.

  20. Starting an open access journal in Iceland

    OpenAIRE

    Watson, Ian

    2009-01-01

    To access full text version of this article. Please click on the hyperlink "View/Open" at the bottom of this page The Bifröst Journal of Social Science / Tímarit um félagsvísindi is one of Iceland’s first open access journals and the first to use Open Journal Systems software. This article summarizes lessons learned from the first three years of the journal’s operation, including issues connected to funding, staffing, peer review, printing, bibliographic formats, and the future of open acc...

  1. Reflections on 25 Years of Journal Editorship

    Science.gov (United States)

    Matthews, Michael R.

    2015-07-01

    These reflections range over some distinctive features of the journal Science & Education, they acknowledge in a limited way the many individuals who over the past 25 years have contributed to the success and reputation of the journal, they chart the beginnings of the journal, and they dwell on a few central concerns—clear writing and the contribution of HPS to teacher education. The reflections also revisit the much-debated and written-upon philosophical and pedagogical arguments occasioned by the rise and possible demise of constructivism in science education.

  2. ELECTRONIC JOURNALS: A NEW DIMENSION TO RESEARCH

    Directory of Open Access Journals (Sweden)

    Maham Zaman

    2012-01-01

    Full Text Available The latest discovery in the field of writing has been the “electronic publication”. This mode of publication is now being used in all fields of research. Easily accessible, these electronic journals (e-journals are available worldwide through the internet. Studies have been conducted to verify whether this entity is beneficial or harmful to the field of research.Thus electronic journals are a new dimension to research.They not only ease the publications process but also improve its worldwide visibility.

  3. Ranking policy and political economic journals

    OpenAIRE

    Halkos, George; Tzeremes, Nickolaos

    2012-01-01

    The purpose of this paper is to rank economic journals in the broader field of policy and political science. By using one composite input and one composite output the paper ranks 52 journals in a linear programming setting using data for the time period of 1996-2010. In addition for the first time three different quality ranking reports have been incorporated into a Data Envelopment Analysis (DEA) modelling problem in order to classify these journals into four categories (‘A’ to ‘D’). The ran...

  4. Annual Journal citation indices: a comparative study

    CERN Document Server

    Khaleque, Abdul; Sen, Parongama

    2016-01-01

    We study the statistics of citations made to the indexed Science journals in the Journal Citation Reports during the period 2004-2013 using different measures. We consider different measures which quantify the impact of the journals. To our surprise, we find that the apparently uncorrelated measures, even when defined in an arbitrary manner, show strong correlations. This is checked over all the years considered. Impact factor being one of these measures, the present work raises the question whether it is actually a nearly perfect index as claimed often. In addition we study the distributions of the different indices which also behave similarly.

  5. The Kennedy Report: Commission Evaluates High School Journalism

    Science.gov (United States)

    Heintz, Ann

    1974-01-01

    Presents excerpts from the report of the Kennedy Commission of Inquiry into High School Journalism, concentrating on censorship, minority participation, journalism education, established media, and censorship issues.

  6. Is journalism failing on climate?

    Science.gov (United States)

    Rahmstorf, Stefan

    2012-12-01

    How can we build a reliable and affordable energy supply based on renewables? How rapidly do we need to cut greenhouse gas emissions to keep climate change within manageable bounds? What does it take to maintain a stable common currency of different nations? These are just a few examples of questions that are critical for our future and that require an understanding of complex systems—the energy system, the climate system, the financial system. Finding sound answers to these questions requires sophisticated scientific analysis and expert knowledge; a lay person's intuition will clearly not suffice. Yet, decisions in a democracy are (and should be!) taken by politicians and the voting public who are not usually scientific experts. Hence the well-being of our societies—and even more so the living conditions of future generations, which are defined by the decisions we take today—depends on the wider public being well informed about the state of scientific knowledge and discourse. The media are the most important means by which lay people obtain their information about science. Good science journalism is therefore a decisive factor for the long-term success of modern society. Good science journalism clearly must be critical journalism, and it requires journalists who know what is what, who can put things into a perspective, and who are able to make well-informed judgements. After all, the role of science journalism is not simply to act as a 'translator' who conveys the findings of scientists in a language understandable to lay people. Rather, good science journalism will provide the public with a realistic impression of what is well established in science and what are current 'hot topics', uncertainties and controversies. It will also discuss the methods and social context of the scientific endeavour. There is ample evidence that in the area of climate science, journalism too often is failing to deliver this realistic picture to its audience, despite many good

  7. Twitter, Journalism and Affective Labour

    Directory of Open Access Journals (Sweden)

    Eugenia Siapera

    2015-03-01

    Full Text Available The rise of the network aspects of journalism in the context of social mediasuch as Twitter, and the increased importance accorded to community building and maintenance as well as to reciprocity, point to the need to take into account the affective part of journalistic labour. This refers to these aspects of journalistic work that are linked to the creation of networks and communities, to interactions with readers and the forming of bonds between journalists and their readers. An analysis of the affective labour of journalists on Twitter, we argue, is necessary in order to understand the potential and ambiguities of this part of their labour. Based on a set of in-depth interviews with Twitter journalists, this article found three main repertoires of affective labour: the organic relations repertoire, which points to the increasing importance of authenticity as a means of establishing credibility on Twitter; the temporal repertoire; and the repertoire of responsibility. The importance of the affective labour of journalism is found in its biopolitical productivity. The development of an organic relationship with followers, the emergence of stronger bonds between core groups that then become communities, the extension of care and help to the network, are all evidence of the importance of this biopolitical productivity and point to the construction of a new and potentially more radical sociopolitical role for journalism. However, this potential is ambiguous insofar as these elements contain unresolved tensions and ambiguities. These include the trade in selves and the associated commodification; the re-formulation of time, especially its diachronic dimension, as accumulation of social capital; the role of reciprocity and responsibility in reproducing inequalities; and care as care for only those deemed deserving. These ambiguities severely undermine and limit the potentials of affective labour, pointing to the need to develop a purposeful political

  8. Documenting the Earliest Chinese Journals

    Directory of Open Access Journals (Sweden)

    Jian-zhong (Joe Zhou

    2001-10-01

    Full Text Available

    頁次:19-24

    According to various authoritative sources, the English word "journal" was first used in the 16lh century, but the existence of the journal in its original meaning as a daily record can be traced back to Acta Diuma (Daily Events in ancient Roman cities as early as 59 B.C. This article documents the first appearance of Chinese daily records that were much early than 59 B.C.

    The evidence of the earlier Chinese daily records came from some important archaeological discoveries in the 1970's, but they were also documented by Sima Qian (145 B.C. - 85 B.C., the grand historian of the Han Dynasty imperial court. Sima's lifetime contribution was the publication of Shi Ji (史記 (The Grand Scribe's Records, the Records hereafter. The Records is a book of history of a grand scope. It encompasses all Chinese history from 30lh century B.C. through the end of the second century B.C. in 130 chapters and over 525,000 Chinese

  9. Utilization of office computer for journal subscription

    International Nuclear Information System (INIS)

    Integrated library automation system has been operating in Japan Atomic Energy Research Institute library, which consists of three subsystems for serials control, book acquisition and circulation control. Functions of the serials control subsystem have been improved to reduce the work load of journal subscription work. Subscription price(both in foreign currency and Japanese yen), conversion factor, foreign currency exchange rate are newly introduced as data elements to a master file for automatic calculation and totalization in the system, e.g. conversion of subscription price from foreign currency into Japanese yen. Some kinds of journal lists are also printed out, such as journal subscription list, journal distribution list for each laboratory, etc. (author)

  10. CFFTP journal volume 9 no.3

    International Nuclear Information System (INIS)

    Short journal article from the Canadian Fusion Fuels Technology Project (CFFTP), highlighting tritium monitors, new committee members, staff changes, Tokamak divertor physics research, divertor maintenance robotics and advanced process for hydrogen isotope separation

  11. The Crop Journal Calls for Papers

    Institute of Scientific and Technical Information of China (English)

    2015-01-01

    <正>We would like to invite you to submit your latest research accomplishments to The Crop Journal(ISSN:2095-5421;Online ISSN:2214-5141,CN 10-1112/S),a new bimonthly academic journal co-sponsored by the Crop Science Society of China and the Institute of Crop Science,Chinese Academy of Agricultural Sciences.The Crop Journal is freely available online(Open Access)in Science Direct.The Editor-in-Chief of The Crop Journal is Professor Jianmin Wan,Ph D,Cheung Kong Scholar,Director of the Institute of Crop Science and Executive Vice President of the Crop Science Society of China,supported by

  12. The Crop Journal Calls for Papers

    Institute of Scientific and Technical Information of China (English)

    2014-01-01

    <正>We would like to invite you to submit your latest research accomplishments to The Crop Journal(ISSN:2095-5421;Online ISSN:2214-5141,CN 10-1112/S),a new bimonthly academic journal co-sponsored by the Crop Science Society of China and the Institute of Crop Science,Chinese Academy of Agricultural Sciences.The Crop Journal is freely available online(Open Access) in Science Direct.The Editor-in-Chief of The Crop Journal is Professor Jianmin Wan,PhD,Cheung Kong Scholar,Director of the Institute of Crop Science and Executive Vice President of the Crop Science Society of China,supported by

  13. The Crop Journal Calls for Papers

    Institute of Scientific and Technical Information of China (English)

    2014-01-01

    <正>We would like to invite you to submit your latest research accomplishments to The Crop Journal(ISSN:2095-5421;Online ISSN:2214-5141,CN 10-1112/S),a new bimonthly academic journal co-sponsored by the Crop Science Society of China and the Institute of Crop Science,Chinese Academy of Agricultural Sciences.The Crop Journal is freely available online(Open Access)in ScienceDirect.The Editor-in-Chief of The Crop Journal is Professor Jianmin Wan,PhD,Cheung Kong Scholar,Director of the Institute of Crop Science and Executive Vice President of the Crop Science Society of China,supported by the Editorial Board of 85 international experts from various fields of crop sciences.

  14. New journal: Algorithms for Molecular Biology

    Directory of Open Access Journals (Sweden)

    Stadler Peter F

    2006-02-01

    Full Text Available Abstract This editorial announces Algorithms for Molecular Biology, a new online open access journal published by BioMed Central. By launching the first open access journal on algorithmic bioinformatics, we provide a forum for fast publication of high-quality research articles in this rapidly evolving field. Our journal will publish thoroughly peer-reviewed papers without length limitations covering all aspects of algorithmic data analysis in computatioal biology. Publications in Algorithms for Molecular Biology are easy to find, highly visible and tracked by organisations such as PubMed. An established online submission system makes a fast reviewing procedure possible and enables us to publish accepted papers without delay. All articles published in our journal are permanently archived by PubMed Central and other scientific archives. We are looking forward to receiving your contributions.

  15. New accomplishments of Ambiente & Agua scientific journal

    Directory of Open Access Journals (Sweden)

    Getulio Teixeira Batista

    2009-04-01

    Full Text Available Ambiente & Água – An Interdisciplinary Journal of Applied Science (Ambi-Agua was classified as B2 in the Interdisciplinary Area, the major thematic area of this journal, by CAPES classification system known as "Qualis". Also, the journal was registered in the Digital Object Identifier (DOI® System. Three other facts were accomplished: 1 all published articles since April, 2008 have the submitted and accepted dates stamped; 2 long-term preservation will be now secured in association with DOAJ - Lund University Libraries and the e-Depot of the National Library of the Netherlands (KB; and 3 we entered into an electronic licensing relationship with EBSCO Publishing to have full text of our journal in EBSCO Publishing's databases in the near future.

  16. INIS: Authority list for journal titles

    International Nuclear Information System (INIS)

    This is the 33rd revision of the INIS: Authority List for Journal Titles (IAEA-INIS-11). This list is published annually and includes the titles of all journals which have contained articles submitted to INIS at the time of publication. The current list contains 13 396 journal titles, 2 170 regularly scanned journals and 578 key journals. It was last updated in February 2007. A journal - or periodical - is a continuing publication issued in a succession of discrete parts, usually bearing numbering and/or chronological designations and intended to be continued indefinitely. It is generally published within a defined, fixed interval between issues and normally appears more than once per year. It includes a mixture of articles, letters, summaries, etc. Within this definition, annuals such as the Annual Review of Nuclear Science are included, but series titles such as the McGraw-Hill Series in Nuclear Engineering are not. The purpose of this document is to provide descriptive cataloguers with standard elements to include in bibliographic level 'S' of the INIS record. These elements include field (tag) 229 (Full Journal Title), 320 (ISSN) and 321 (CODEN). The full journal title is mandatory, and either the ISSN or the CODEN must be included (both may appear). Instructions on how to use this and other elements of the INIS record format are found in INIS: Guide to Bibliographic Description (IAEA-INIS-1). In order to help the user find titles easily, the list is arranged in six parts, followed by summary statistics: - In Part I, all key journals are grouped under the name of the country or international organization responsible for their input in INIS, then sorted alphabetically under their title. - In Part II, all key journals are sorted alphabetically under their title. The name of the country or international organization responsible for their input in INIS is entered in parentheses within the body of the entry. - In Part III, all journals that are regularly scanned by

  17. ELSEVIER SCIENTIFIC JOURNALS AVAILABLE ON YOUR DESKTOP

    CERN Multimedia

    1999-01-01

    Elsevier Science Publishers have for decades distributed renowned journals in science and technology, which are now accessible on the Web through their Science Direct service. CERN has been granted a site licence trial period until the end of 1999.Included among the titles are: Astroparticle physics, Computer physics communications, Nuclear instruments and methods in physics research A and B, Nuclear physics A and B, Physics letters A and B, Physics reports, Surface science and Thin solid films.Links to the individual titles appear in our electronic journals list at:http://wwwas.cern.ch/library/electronic_journals/ejAH.htmlThe Library invites all readers to search and download articles of the journals currently subscribed to. You can also access the full Science Direct site at: http://www.sciencedirect.com/(Choose 'group-wide login' or, for a 'personal login' registration, please contact us)All questions and comments are welcome and can be addressed to: library.desk@cern.ch

  18. The Many Crises of Western Journalism

    DEFF Research Database (Denmark)

    Nielsen, Rasmus Kleis

    trade publications and other media, the chapter reveals how answers to these questions differs from country to country, how the forms of argument are combined in distinctive ways, and how different kinds of evidence are mobilized. Particular constructions of the crisis range from economically and...... journalists, media executives, and media policymakers in six different Western democracies (Finland, France, Germany, Italy, the UK, and the US) employ three distinctive frameworks to interpret the state of professional journalism in their country. The first is an economic frame that defines the crisis of...... journalists, media executives, and media policymakers. The economic question is “Will journalism survive?” The professional question is “What is journalism?” The symbolic question is “What is the status of journalism in society?” On the basis of almost one hundred interviews, as well as secondary sources from...

  19. INIS: Authority list for journal titles

    International Nuclear Information System (INIS)

    This is the 34th revision of the INIS: Authority List for Journal Titles (IAEA-INIS-11). This list is published annually and includes the titles of all journals which have contained articles submitted to INIS at the time of publication. The current list contains 13 538 journal titles, 2 106 regularly scanned journals and 613 key journals. It was last updated in February 2008. A journal - or periodical - is a continuing publication issued in a succession of discrete parts, usually bearing numbering and/or chronological designations and intended to be continued indefinitely. It is generally published within a defined, fixed interval between issues and normally appears more than once per year. It includes a mixture of articles, letters, summaries, etc. Within this definition, annuals such as the Annual Review of Nuclear Science are included, but series titles such as the McGraw-Hill Series in Nuclear Engineering are not. The purpose of this document is to provide descriptive cataloguers with standard elements to include in bibliographic level 'S' of the INIS record. These elements include field (tag) 229 (Full Journal Title), 320 (ISSN) and 321 (CODEN). The full journal title is mandatory, and either the ISSN or the CODEN must be included (both may appear). Instructions on how to use this and other elements of the INIS record format are found in INIS: Guide to Bibliographic Description (IAEA-INIS-1). In order to help the user find titles easily, the list is arranged in six parts, followed by summary statistics: - In Part I, all key journals are grouped under the name of the country or international organization responsible for their input in INIS, then sorted alphabetically under their title. - In Part II, all key journals are sorted alphabetically under their title. The name of the country or international organization responsible for their input in INIS is entered in parentheses within the body of the entry. - In Part III, all journals that are regularly scanned by

  20. Median Citation Index vs Journal Impact Factor

    Science.gov (United States)

    Antonoyiannakis, Manolis

    2015-03-01

    The Journal Impact Factor is an arithmetic mean: It is the average number of citations, in a year, to a journal's articles that were published the previous two years. But for the vast majority of scholarly journals, the distribution of these citations is skewed (non-symmetric). We argue that a more representative member of the skewed distribution of citations is its median, not the mean. We thus introduce the Median Citation Index (MCI) and compare it to the journal Impact Factor (JIF) as a potentially more suitable choice of the ``center'' of the distribution, or its typical value. Unlike the JIF, the MCI is far less sensitive to outlier (very highly cited) papers or to gaming, and does not lend itself to the hype of calculating it to three decimal digits.

  1. The journal of irreproducible results II

    CERN Document Server

    Scherr, George H

    1997-01-01

    Compilation of offbeat science papers from the Journal of Irreproducible Results, including: Emotion in the Rat Face; Foamy Beer; Cooking with Potential Energy; The Large-Cake Cutting Problem; Siamese Twinning in Gummy Bears; much more.

  2. What to do About Journalism? Journalism and the International academic world

    Directory of Open Access Journals (Sweden)

    Barbie Zelizer

    2007-12-01

    Full Text Available I begin with a question that may seem to be labor the point to readers of this article but which I believe holds some of the key issues associated with contemporary journalism.“What to do about journalism?” is a question that has not only conceptual dimensions – as in what do we study when we think about journalism -- but also pedagogic ones -- how do we teach what we think we know – and, most importantly, pragmatic ones – what is journalism today? And how will we continue practicing it into the coming era? on this article I would like to think through some of the most important challenges facing the study of contemporary journalism. I’ll be drawing from my own work that has been somewhat focused on the fundamental question of what journalism is for.

  3. Open Access Journals with a view of journals covered in ISI

    Directory of Open Access Journals (Sweden)

    Mohammad Karim Saberi

    2009-01-01

    Full Text Available Due to diversity and quick dissemination of information, journals have a higher number of audience when compared with other information carriers. Nevertheless with the emerging new information technologies have contributed to the appeal and thriving of journals, Open Access Journals in particular. The present paper intends initially to discuss the open access movement that gave rise to the emergence of open access journals. It would then introduce modes of open access as well as the characteristics and definitions associated with OAJ. This would be followed up by a classification of OAJ along with their advantages. Means for financing such journals as well as directory of open access journals would be also discussed. Finally, the OAJ covered by ISI as well as those published by the top 20 countries who lead science production are presented

  4. Journalism as a profession in Brazil

    OpenAIRE

    Andrea Ferraz Fernandez; Cláudia Lago

    2011-01-01

    Journalism as a profession in Brazil discusses the professional characteristics of Journalism in Brazil under the following aspects: 1) formal conditions of access, 2) conditions and effects of the monopoly on the journalistic activity 3) presence of a distinct culture and ethic, based on the notion of the journalist’s social responsibility and 4) characteristics of the real community of individuals who share the journalistic identity. Based on this scope, we can perceive the singularity of t...

  5. Diversity – An International and Interdisciplinary Journal

    OpenAIRE

    Shu-Kun Lin

    2009-01-01

    After many years of careful planning, we are pleased to launch Diversity (ISSN 1424-2818), a new international and interdisciplinary Open Access journal. Among diversity topics, biodiversity has always been a key topic. In 1996, when I was establishing Molecular Diversity Preservation International (MDPI), an organization dedicated to the collection and distribution of rare molecular samples, I read several books on biodiversity. To promote the MDPI project, in 1996 the journal Molecules was ...

  6. The 21st century chemistry journal

    OpenAIRE

    Steven M. Bachrach

    1999-01-01

    Internet publication will radically alter how chemists will publish their research in the next century. In this article, we describe two fundamental changes: enhanced chemical publication which allows chemists to publish materials that cannot be published on paper and end-user customization which allows readers to read articles prepared to meet their specifications. These concepts have been implemented within the Internet Journal of Chemistry, a new journal designed to employ the latest techn...

  7. ICONARP INTERNATIONAL JOURNAL OF ARCHITECTURE AND PLANNING

    OpenAIRE

    Architecture and Planning, ICONARP International Journal of

    2014-01-01

    ICONARP as an e-journal considers original articles, research briefs, book reviews and viewpoints in peer-reviewed. ICONARP is an exciting new venture occurred with experiences, theoretical approaches, critical and empirical studies in the field of architecture and planning. The journal aims to be a platform for the studies of design, education and iv application and has a goal to be a bridge in between traditional/modern, east/west, local/global in the disciplines of Architecture / Planning....

  8. Journalism Curiosity and Story Telling Frame

    DEFF Research Database (Denmark)

    Grunwald, Ebbe; Rupar, Verica

    2009-01-01

    epistemological and organisational dimension of frames relates to the process of  meaning-making. We suggest refining the concept of frame in journalism studies by making a distinction between a frame (an epistemological category) and an angle (a textual organisation category). Our investigation shows that this...... distinction better serves the analysis and understanding of the mechanisms behind journalism in comparative contexts. Udgivelsesdato: December...

  9. Developing Quantitative Models for Auditing Journal Entries

    OpenAIRE

    Argyrou, Argyris

    2013-01-01

    The thesis examines how the auditing of journal entries can detect and prevent financial statement fraud. Financial statement fraud occurs when an intentional act causes financial statements to be materially misstated. Although it is not a new phenomenon, financial statement fraud has attracted much publicity in the wake of numerous cases of financial malfeasance (e.g. ENRON, WorldCom). Existing literature has provided limited empirical evidence on the link between auditing journal entrie...

  10. EUROPEAN JOURNAL OF COMPARATIVE ECONOMICS - ISSUE 2

    OpenAIRE

    Giovanni Ramello

    2005-01-01

    The European Journal of Comparative Economics, an online refereed journal for scientific articles publishing theoretical and empirical research in any field of comparative economic studies, is promiting the issue 2 2004 freely downloadable at the website http://eaces.liuc.it/ New submission for the next issues are welcome. Table of contents: Corporate and public governances in transition: the limits of property rights and the significance of legal institutions by Jean-François Nivet Price and...

  11. Bibliographic reviews in Cuban medical journals.

    OpenAIRE

    Lucitere Rodríguez González

    2008-01-01

    Background: Bibliographic reviews acquire great importance in the specific context of medical publications; however, some editorial facts can affect their scientific value. Objective: To characterize the bibliographic reviews published by some Cuban medical journals. Methods: The most recent reviews (10) were analyzed by means of an exploratory, retrospective and descriptive study. Selected from 5 electronic medical journals, summing up 50 articles. The following variables were studied: artic...

  12. Journal of Undergraduate Research, Volume VI, 2006

    Energy Technology Data Exchange (ETDEWEB)

    Faletra, P.; Schuetz, A.; Cherkerzian, D.; Clark, T.

    2006-01-01

    Students who conducted research at DOE National Laboratories during 2005 were invited to include their research abstracts, and for a select few, their completed research papers in this Journal. This Journal is direct evidence of students collaborating with their mentors. Fields in which these students worked include: Biology; Chemistry; Computer Science; Engineering; Environmental Science; General Sciences; Materials Sciences; Medical and Health Sciences; Nuclear Sciences; Physics; and Science Policy.

  13. A journal ranking for the ambitious economist

    OpenAIRE

    Kristie M. Engemann; Wall, Howard J.

    2009-01-01

    The authors devise an "ambition-adjusted" journal ranking based on citations from a short list of top general-interest journals in economics. Underlying this ranking is the notion that an ambitious economist wishes to be acknowledged not only in the highest reaches of the profession, but also outside his or her subfield. In addition to the conceptual advantages that they find in their ambition adjustment, they see two main practical advantages: greater transparency and a consistent treatment ...

  14. References in the Australasian Medical Journal

    Directory of Open Access Journals (Sweden)

    Prakash Adhikari

    2010-12-01

    Full Text Available BackgroundReferences serve as an important tool in providing credibility to the published literature and to assist retrieval of the cited and related information. This study was done to observe the accuracy of references in articles published in Australasian Medical Journal.Method Fifty references were randomly selected from two different issues of Australasian Medical Journal (AMJ: Volume 3, Number 11, 2010 and Volume 3, Number 10, 2010. The instructions for authors of this journal were examined. References from each article were compared with the original for accuracy, using the following six elements: 1 authors; including spelling, initials, order and number; 2 title, including spelling and punctuation; 3 journal name, including use of correct abbreviation as listed in Index Medicus; 4 year; 5 volume; and 6 page numbers, including first and last page numbers. Citations were considered incorrect if there was an error in any of these six elements. References not cited from indexed journals were excluded. Statistical analysis was done by using frequency and percentage.ResultsResults show that 14.0% references in AMJ were inaccurate. Most common errors were author’s name and journal name. Author’s names were found to be incorrect in 10.0% references while journal name (either incorrect abbreviations or incorrect instructions or punctuation errors were found to be incorrect in 4.0%. Least common error was found in writing the title of the article (2.0%. There were no errors found in other elements.ConclusionErrors in citing the references are also found in the AMJ. The quoted error in this study (14.0% is comparable to other international literature. The majority of errors are avoidable. So, the authors, editors and the reviewers have to check for any errors seriously before publication in the journal.

  15. Pathways to Internationalize Brazilian Journals of Psychology

    OpenAIRE

    Estêvão C. Gamba; Abel Laerte Packer; Rogerio Meneghini

    2015-01-01

    AbstractThe science of psychology has been developing in the country of Brazil over the last 50 years. Nonetheless, most of the science in this field is published only in Brazilian journals. Overall, Brazil has yet to share its science with the international community. The potential to internationalize the science generated by Brazilian psychologists exists, though. One way would be to scale up the publication of Brazilian psychologists in international journals. Another way would be to inter...

  16. Flipping journals to open: Rethinking publishing infrastructure

    OpenAIRE

    Fecher, Benedikt; Wagner, Gert G.

    2015-01-01

    The resignation of the editorial board of an Elsevier-owned linguistics journal and its open access reorganization could get the ball rolling for other journals to follow suit. This case is a reminder that open access means more than just providing access to an article; it means rethinking the whole process of publishing. Open access also raises important questions about who owns the critical information infrastructure for online publishing.

  17. Thematic review of family therapy journals 2012

    OpenAIRE

    Carr, Alan.

    2013-01-01

    In this article the contents of the principal English-language family therapy journals, and key family therapy articles published in other journals in 2012 are reviewed under these headings: therapy processes in the treatment of child-focused problems, autism, adolescent substance use, human immunodeficiency virus, depression and grief, fragile families, mental health recovery, medical family therapy, family business and systemic practice, couple therapy, intimate partner violence, key issues...

  18. Investigation of H+ implanted Fe-Al alloys

    Czech Academy of Sciences Publication Activity Database

    Lukáč, F.; Čížek, J.; Procházka, I.; Jirásková, Yvonna; Janičkovič, D.; Veterníková, Š.; Anwand, W.; Butterling, M.

    Bristol: IOP Publishing, 2014 - (Hugenschmidt, C.; Piochacz, C.), 012013. (Journal of Physics Conference Series. 505). ISSN 1742-6588. [SLOPOS13 - International Workshop on Slow Positron Beam Techniques and Applications /13./. Mnichov (DE), 15.09.2013-20.09.2013] R&D Projects: GA ČR(CZ) GAP108/11/1350; GA MŠk 7AMB12SK009 Institutional support: RVO:68081723 Keywords : Hydrogen implantation * Fe-Al alloy * positron annihilation Subject RIV: BM - Solid Matter Physics ; Magnetism

  19. Fatigue Crack Initiation and Propagation of Aluminum Alloy Bearings

    Institute of Scientific and Technical Information of China (English)

    CHENG Xian-Hua; MA Yan-Yan

    2004-01-01

    Observation of fatigue crack initiation and propagation during fatigue test in ALSn20Cu bearing has been presented. Journal center orbit, oil film pressure and stress distribution in alloy layer have been calculated and are taken as the basis for theoretically simulating the bearing fatigue process. It is found that the calculated results are in good accordance with the experimental results, which provides a feasible way for investigation of fatigue crack propagation process in the bearing.

  20. Alloy Fabrication Laboratory

    Data.gov (United States)

    Federal Laboratory Consortium — At NETL’s Alloy Fabrication Facility in Albany, OR, researchers conduct DOE research projects to produce new alloys suited to a variety of applications, from gas...

  1. International Journal of Herbal Medicine (IJHM): A New Open-Access International Journal

    OpenAIRE

    Joshi, Rakesh K.

    2013-01-01

    It is with pleasure that we introduce the first issue of online journal “International Journal of Herbal Medicine (IHJM)” a bimonthly publication of AkiNik Publications. The Journal is peer-reviewed, broad-spectrum and committed to the promotion of research and dissemination of knowledge in Phytochemistry, Pharmacognosy, Essential oil chemistry, Natural product chemistry, Botany, Biochemistry, Biotechnology, Marine research and related multidiscipline. IJHM also provides an advanced internati...

  2. Open Journal Systems 2.0: the Evolution of Open Source Journal Management

    OpenAIRE

    Willinsky, J.; M. Quint

    2005-01-01

    Purpose. To provide an insider’s review of the journal management and publishing software, Open Journal Systems (OJS), from the Public Knowledge Project, which the author directs at the University of British ColumbiaDesign. The paper outlines the history, development, and features of OJS, including some of the experimental aspects, as well as early research results and work underway on which it is based.Findings. Open Journal Systems is an open source solution to managing and publishing schol...

  3. Ranking Journals Following a Matching Model Approach. An Application to Public Economics Journals

    OpenAIRE

    Pujol, F.

    2006-01-01

    Journal rankings based on citation indexes are widely used in the economics field for global top journals. We propose an alternative way to rank journals based on the publishing behavior of top ranked authors. We justify this approach by depicting the scientific publishing market as following a matching process. Compared to the citation approach, the methodology that we propose has comparative advantages in terms of time effort to produce national and subdiscipline rankings, and it makes it p...

  4. What If Law Journal Citations Included Digital Object Identifiers?: A Snapshot of Major Law Journals

    OpenAIRE

    Keele, Benjamin J.

    2010-01-01

    Prevailing citation practice in law journals is to use uniform resource locators (URLs) when citing electronic sources. Digital object identifiers (DOIs) provide a more reliable and robust mechanism for citing digital, scholarly articles. This study examines to what extent DOIs exist but are not used in law journal citations. Citations to scholarly articles from twenty-five randomly-selected articles appearing in the 2008-2009 volumes of four major law journals (Harvard Law Review, Columbia L...

  5. Evaluating Journal Quality: A Review of Journal Citation Indicators and Ranking in Business and Management

    OpenAIRE

    Mingers, John; Yang, Liying

    2016-01-01

    Abstract: Evaluating the quality of academic journal is becoming increasing important within the context of research performance evaluation. Traditionally, journals have been ranked by peer review lists such as that of the Association of Business Schools (UK) or though their journal impact factor (JIF). However, several new indicators have been developed, such as the h-index, SJR, SNIP and the Eigenfactor which take into account different factors and therefore have their own particular biases...

  6. New (and old Trends in Journalism Research

    Directory of Open Access Journals (Sweden)

    Nelson Traquina

    2006-06-01

    Full Text Available In this paper, I look back to the vast area of communication sciences, that fi rst arrived in the university sphere by means of journalism subjects. In reality, one of the fi rst academic magazines in the area of communication sciences was a magazine concerning journalism. During the 1940´s and 1950´s, journalism research was at the center of the renowned studies by Lazarsfeld. In the years that follow, Journalism study´s dependence on sociological inquiries and content analysis was left behind in the explosion of studies that took place in the 1960´s and 70`s. In the more recent years, the explosion of studies of Journalism was marked by the recourse to a multiplicity of new methodologies (such as, for example, the ethno-methodological approach, discursive analysis, focus groups, by the emergence and growing infl uence of television, by the interest relating to journalism´s ideological role, as well as by the appearance of new paradigms for understanding the news.

  7. Selected Free E-Journals in Library and Information Science in Directory of Open Access Journals

    Directory of Open Access Journals (Sweden)

    Kaushal Chauhan

    2012-07-01

    Full Text Available Purpose of this study is to evaluate open access e-journals in LIS available on Directory of Open AccessJournals (DOAJ. The DOAJ provides access to quality controlled Open access journals. DOAJ is an effectivesource of information for the present day. There is no alternative and substitute to its abundance, utility, andvalue. This paper is an effort to guide students, researchers, scholars about free, full-text, quality-controlledscientific and scholarly journals in Library and information science available on DOAJ.

  8. Selected Free E-Journals in Library and Information Science in Directory of Open Access Journals

    Directory of Open Access Journals (Sweden)

    Kaushal Chauhan

    2012-07-01

    Full Text Available Purpose of this study is to evaluate open access e-journals in LIS available on Directory of Open AccessJournals (DOAJ. The DOAJ provides access to quality controlled Open access journals. DOAJ is an effectivesource of information for the present day. There is no alternative and substitute to its abundance, utility, andvalue. This paper is an effort to guide students, researchers, scholars about free, full-text, quality-controlledscientific and scholarly journals in Library and information science available on DOAJ.http://dx.doi.org/10.14429/djlit.32.4.2529

  9. What to do About Journalism? Journalism and the International academic world

    OpenAIRE

    Barbie Zelizer

    2011-01-01

    I begin with a question that may seem to be labor the point to readers of this article but which I believe holds some of the key issues associated with contemporary journalism.“What to do about journalism?” is a question that has not only conceptual dimensions – as in what do we study when we think about journalism -- but also pedagogic ones -- how do we teach what we think we know – and, most importantly, pragmatic ones – what is journalism today? And how will we continue practicing it into ...

  10. Terbium base alloy

    International Nuclear Information System (INIS)

    Composition of terbium-5-7 % gadolinium alloy with high magnetostriction sensitivity (180x10-8 Oe) is suggested. The alloy is designed for usage under cryogenic temperature within 500-1500 Oe fields. Magnetostriction sensitivity of the suggested alloy is by 2-2.5 times higher, than that of well-known before one. 1 tab

  11. F-Alloy: An Alloy Based Model Transformation Language

    OpenAIRE

    Gammaitoni, Loïc; Kelsen, Pierre

    2015-01-01

    Model transformations are one of the core artifacts of a model-driven engineering approach. The relational logic language Alloy has been used in the past to verify properties of model transformations. In this paper we introduce the concept of functional Alloy modules. In essence a functional Alloy module can be viewed as an Alloy module representing a model transformation. We describe a sublanguage of Alloy called F-Alloy that allows the specification of functional Alloy modules. Module...

  12. Subject Journal Review: Personnel Management and Industrial Psychology.

    Science.gov (United States)

    Herman, Georgianna

    1984-01-01

    This annotated bibliography lists 35 primary journals devoted to personnel management and industrial psychology in such categories as human resource planning, employee training, compensation, and employment law. History of the field, journal selection, journal specializations (for practitioners and academicians), journal indexing/abstracting,…

  13. Characteristics of Open Access Journals in Six Subject Areas

    Science.gov (United States)

    Walters, William H.; Linvill, Anne C.

    2011-01-01

    We examine the characteristics of 663 Open Access (OA) journals in biology, computer science, economics, history, medicine, and psychology, then compare the OA journals with impact factors to comparable subscription journals. There is great variation in the size of OA journals; the largest publishes more than 2,700 articles per year, but half…

  14. Open access to social science journals in Latin America

    OpenAIRE

    Babini, Dominique

    2010-01-01

    During the 2000s, Latin America has contributed to the development of alternative journal portalsintended to improve the visibility of and accessto regionally published socialscience journals. The relatively poor visibility ofregional journals and their authorsis often due to budgetary constraintsforthe distribution of printed journals, and theirlimited presence in international indexes. These are an incentive forthe development of open access(OA)

  15. Recent changes in peer-reviewed dermatology journals

    OpenAIRE

    Ahmad Al Aboud; Khalid Al Aboud

    2012-01-01

    Peer-reviewed dermatology journals are essential media for dermatologists and are undergoing many changes to satisfy readers and authors. The number of dermatology journals and new journals that are devoted to dermatology subspecialties that are being published is increasing. This report highlights recent changes in peer-reviewed dermatology journals.

  16. 49 CFR 230.101 - Steam locomotive driving journal boxes.

    Science.gov (United States)

    2010-10-01

    ... 49 Transportation 4 2010-10-01 2010-10-01 false Steam locomotive driving journal boxes. 230.101... Locomotives and Tenders Running Gear § 230.101 Steam locomotive driving journal boxes. (a) Driving journal boxes. Driving journal boxes shall be maintained in a safe and suitable condition for service. Not...

  17. 49 CFR 230.102 - Tender plain bearing journal boxes.

    Science.gov (United States)

    2010-10-01

    ... 49 Transportation 4 2010-10-01 2010-10-01 false Tender plain bearing journal boxes. 230.102... Locomotives and Tenders Running Gear § 230.102 Tender plain bearing journal boxes. Plain bearing journal boxes... expected to damage the bearing; or have a detrimental effect on the lubrication of the journal and...

  18. Status of Journals in the Field of Higher Education

    Science.gov (United States)

    Bray, Nathaniel J.; Major, Claire H.

    2011-01-01

    During the past 50 years, the field of higher education has experienced growth, maturation, and specialization, coinciding with an almost exponential increase in the number of higher education journals. The proliferation of journals has led to an increased focus on journal status by members of the field. Not surprisingly, an informal journal caste…

  19. Assessment of Some Major Journals of International/Comparative Librarianship.

    Science.gov (United States)

    Rooke, A.

    1983-01-01

    This bibliographic essay summarizes some of the outstanding problems of six major international librarianship journals--"Focus on International and Comparative Librarianship,""IFLA Journal,""International Library Review,""Journal of Library History, Philosophy and Comparative Librarianship,""Libri,""UNESCO Journal of Information Science,…

  20. Quality Australian Journals in the Humanities and Social Sciences

    Science.gov (United States)

    Haddow, Gaby

    2008-01-01

    A pilot study was undertaken to test the journal diffusion factor (JDF) as an alternative to journal impact factors (JIFs) for ranking journals. Bibliometric research methods were applied to rank Australian architecture, communications and education journals by the JDF; this was with the total number of citations they attract in ISI indexed…