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  Subjects -> SCIENCES: COMPREHENSIVE WORKS (Total: 421 journals)
Showing 201 - 265 of 265 Journals sorted alphabetically
Journal of Institute of Science and Technology     Open Access  
Journal of Integrated Science and Technology     Open Access  
Journal of Interaction Science     Open Access   (Followers: 1)
Journal of Kerbala University     Open Access   (Followers: 1)
Journal of King Saud University - Science     Open Access   (Followers: 1)
Journal of Law, Information and Science     Full-text available via subscription   (Followers: 19)
Journal of Mathematical and Fundamental Sciences     Open Access  
Journal of Natural Sciences and Mathematics Research     Open Access  
Journal of Natural Sciences Research     Open Access   (Followers: 4)
Journal of Negative and No Positive Results     Open Access  
Journal of Science (JSc)     Open Access  
Journal of Science and Engineering     Open Access  
Journal of Science and Technology     Open Access   (Followers: 1)
Journal of Science and Technology     Open Access  
Journal of Science and Technology (Ghana)     Open Access   (Followers: 3)
Journal of Science Foundation     Open Access   (Followers: 3)
Journal of Science of the University of Kelaniya Sri Lanka     Open Access  
Journal of Scientific Innovations for Development     Open Access   (Followers: 2)
Journal of Scientific Research     Open Access  
Journal of Scientific Research and Reports     Open Access   (Followers: 1)
Journal of Scientometric Research     Open Access   (Followers: 17)
Journal of Shanghai Jiaotong University (Science)     Hybrid Journal  
Journal of Social Science Research     Open Access   (Followers: 8)
Journal of Systems Science and Information     Hybrid Journal  
Journal of Taibah University for Science     Open Access   (Followers: 1)
Journal of Technology Research and Review     Open Access   (Followers: 1)
Journal of the Asiatic Society of Bangladesh, Science     Open Access  
Journal of the Association of Arab Universities for Basic and Applied Sciences     Open Access   (Followers: 1)
Journal of the Ghana Science Association     Full-text available via subscription   (Followers: 3)
Journal of the History of Ideas     Full-text available via subscription   (Followers: 198)
Journal of the Indian Institute of Science     Hybrid Journal   (Followers: 2)
Journal of the Kentucky Academy of Science     Full-text available via subscription   (Followers: 1)
Journal of the National Science Foundation of Sri Lanka     Open Access   (Followers: 2)
Journal of the Royal Society of New Zealand     Hybrid Journal   (Followers: 48)
Journal of the South Carolina Academy of Science     Open Access  
Journal of Unsolved Questions     Open Access   (Followers: 1)
Jurnal Ilmiah Ilmu Terapan Universitas Jambi : JIITUJ     Open Access   (Followers: 1)
Jurnal Ipteks Terapan     Open Access  
Jurnal Matematika, Sains, Dan Teknologi     Open Access  
Jurnal MIPA     Open Access   (Followers: 3)
Jurnal Natural     Open Access  
Jurnal Sains Dasar     Open Access   (Followers: 1)
Jurnal Teknosains     Open Access  
Jurnal Udayana Mengabdi     Open Access  
Kahramanmaras Sutcu Imam University Journal Of Natural Sciences     Open Access  
Karaelmas Science and Engineering Journal     Open Access   (Followers: 1)
Karbala International Journal of Modern Science     Open Access   (Followers: 3)
Kennedy Institute of Ethics Journal     Full-text available via subscription   (Followers: 6)
LOGIKA Jurnal Ilmiah Lemlit Unswagati Cirebon     Open Access  
Maghrebian Journal of Pure and Applied Science     Full-text available via subscription  
Makara Journal of Science     Open Access  
Malawi Journal of Science and Technology     Open Access   (Followers: 6)
Maskana     Open Access  
Matters     Open Access  
Matters Select     Open Access  
McNair Scholars Research Journal     Open Access  
MethodsX     Open Access   (Followers: 2)
Metode & Forskningsdesign     Open Access   (Followers: 1)
Mètode Science Studies Journal : Annual Review     Open Access  
Middle East Journal of Science     Open Access  
Modern Applied Science     Open Access   (Followers: 2)
Momona Ethiopian Journal of Science     Open Access   (Followers: 4)
Moroccan Journal of Quantitative and Qualitative Research     Open Access   (Followers: 3)
MUST : Journal of Mathematics Education, Science and Technology     Open Access   (Followers: 1)
Mutis     Open Access  
National Academy Science Letters     Hybrid Journal   (Followers: 5)
National Science Review     Hybrid Journal  
Naturen     Full-text available via subscription  
Nepal Journal of Science and Technology     Open Access  
Network Science     Hybrid Journal   (Followers: 5)
New Directions in the Teaching of Physical Sciences     Open Access   (Followers: 2)
Nordic Concrete Research     Open Access  
Nordic Journal of Science and Technology     Open Access   (Followers: 1)
Nordic Studies in Science Education     Open Access   (Followers: 3)
Nova     Open Access  
Nuncius     Hybrid Journal   (Followers: 1)
OmniScience : A Multi-disciplinary Journal     Full-text available via subscription   (Followers: 2)
Open Conference Proceedings Journal     Open Access  
Open Journal of Applied Sciences     Open Access  
Pacific Northwest Journal of Undergraduate Research and Creative Activities     Open Access  
Pacific Science Review     Open Access  
Pacific Science Review A : Natural Science and Engineering     Open Access  
PENDIPA : Journal of Science Education     Open Access  
People and Nature     Open Access   (Followers: 1)
Perspectives in Science     Open Access   (Followers: 1)
Población y Desarrollo - Argonautas y caminantes     Open Access  
Politique et Sociétés     Full-text available via subscription   (Followers: 1)
Portal de la Ciencia     Open Access   (Followers: 1)
Proceedings of the Linnean Society of New South Wales     Full-text available via subscription   (Followers: 2)
Proceedings of the Royal Society of Queensland, The     Full-text available via subscription  
Publicaciones en Ciencias y Tecnología     Open Access  
QScience Connect     Open Access  
Quantitative Science Studies     Open Access   (Followers: 1)
Quest     Open Access  
Rafidain Journal of Science     Open Access   (Followers: 1)
RCCS Annual Review     Open Access  
Rehabilitation Research, Policy, and Education     Hybrid Journal   (Followers: 1)
Reportes Científicos de la FaCEN     Open Access   (Followers: 1)
Reports in Advances of Physical Sciences     Open Access  
Research for All     Open Access   (Followers: 1)
Research Ideas and Outcomes     Open Access   (Followers: 1)
Research Policy : X     Open Access   (Followers: 2)
Respuestas     Open Access  
REVECITEC URBE     Open Access  
Reviews in Theoretical Science     Full-text available via subscription  
Revista Bases de la Ciencia     Open Access  
Revista Binacional Brasil - Argentina: Diálogo entre as ciências     Open Access  
Revista Brasileira de Iniciação Científica     Open Access  
Revista Catarinense da Ciência Contábil     Open Access  
Revista Ciencia y Tecnología     Open Access  
Revista Ciencia y Tecnología     Open Access  
Revista Ciências Exatas e Naturais : RECEN     Open Access  
Revista Científica de la FAREM     Open Access  
Revista Cientifica Guillermo de Ockham     Open Access  
Revista Científica y Tecnológica UPSE     Open Access  
Revista Conhecimento Online     Open Access  
Revista Crítica de Ciências Sociais     Open Access   (Followers: 1)
Revista de Ciencia y Tecnología     Open Access  
Revista de Información Científica     Open Access   (Followers: 1)
Revista de la Academia Colombiana de Ciencias Exactas, Físicas y Naturales     Open Access   (Followers: 1)
Revista de la Universidad del Zulia     Open Access  
Revista Eletrônica de Iniciação Científica em Computação : REIC     Open Access   (Followers: 2)
Revista Eletrônica Ludus Scientiae     Open Access   (Followers: 1)
Revista Internacional de Ciências     Open Access   (Followers: 1)
Revista Logos Ciencia & Tecnología     Open Access   (Followers: 1)
Revista MundoFesc     Open Access   (Followers: 1)
Revista Politécnica     Open Access   (Followers: 1)
Revista Sociedad y Economía     Open Access   (Followers: 1)
Revista Tecnológica     Open Access   (Followers: 1)
Revista Theoria     Open Access   (Followers: 2)
Revista Trópica : Ciências Agrárias e Biológicas     Open Access   (Followers: 1)
Revista UNIMAR     Open Access  
Revista UniVap     Open Access   (Followers: 1)
Revista Vivências em Ensino de Ciências     Open Access  
Revue Sciences / Lettres     Open Access   (Followers: 2)
Royal Society Open Science     Open Access   (Followers: 9)
Ruhuna Journal of Science     Open Access  
Sainsmat     Open Access  
Sainstek : Jurnal Sains dan Teknologi     Open Access  
SAINSTIS     Open Access   (Followers: 1)
Sainteknol : Jurnal Sains dan Teknologi     Open Access  
Sakarya Üniversitesi Fen Bilimleri Enstitüsü Dergisi     Open Access  
Scholedge International Journal of Multidisciplinary & Allied Studies     Open Access   (Followers: 3)
Sci     Open Access  
Science     Full-text available via subscription   (Followers: 4991)
Science & Diplomacy     Free   (Followers: 4)
Science & Technology Studies     Open Access   (Followers: 1)
Science Advances     Free   (Followers: 16)
Science and Technology     Open Access   (Followers: 2)
Science Diliman     Open Access  
Science Heritage Journal     Open Access  
Science Proceedings     Open Access   (Followers: 1)
Science World Journal     Open Access  
Science, Technology and Arts Research Journal     Open Access   (Followers: 1)
ScienceRise     Open Access  
Sciences du jeu     Open Access  
Scientiae Studia     Open Access  
Sciential     Open Access   (Followers: 2)
Scientific African     Open Access  
Scientific American     Full-text available via subscription   (Followers: 442)
Scientific American Mind     Full-text available via subscription   (Followers: 10)
Scientific Bulletin     Open Access  
Scientific Data     Open Access   (Followers: 4)
Scientific Electronic Archives     Open Access  
Scientific Journal of Mehmet Akif Ersoy University     Open Access  
Scientific Journal of Pure and Applied Sciences     Open Access   (Followers: 1)
Scientific Reports     Open Access   (Followers: 80)
Scientific Research and Essays     Open Access   (Followers: 3)
Scientific Research Journal     Open Access   (Followers: 1)
Scientific World     Open Access  
Scientonomy : Journal for the Science of Science     Open Access   (Followers: 1)
Scienze Regionali : Italian Journal of Regional Science     Full-text available via subscription   (Followers: 17)
Selçuk Üniversitesi Fen Fakültesi Fen Dergisi     Open Access  
Selforganizology     Open Access  
Seminário de Iniciação Científica e Seminário Integrado de Ensino, Pesquisa e Extensão     Open Access   (Followers: 1)
Simbiótica     Open Access   (Followers: 1)
SINET : Ethiopian Journal of Science     Open Access   (Followers: 5)
Smart Science     Open Access  
South African Journal of Science     Open Access   (Followers: 4)
South East European University Review (SEEU Review)     Open Access   (Followers: 1)
Springer Science Reviews     Hybrid Journal   (Followers: 5)
SpringerPlus     Open Access   (Followers: 2)
Studies in Multidisciplinarity     Full-text available via subscription   (Followers: 3)
Studies in Science Education     Hybrid Journal   (Followers: 18)
Suid-Afrikaanse Tydskrif vir Natuurwetenskap en Tegnologie     Open Access   (Followers: 1)
Sultan Qaboos University Journal for Science     Open Access  
Tanzania Journal of Science     Open Access   (Followers: 4)
TD : The Journal for Transdisciplinary Research in Southern Africa     Open Access  
Technologies     Open Access   (Followers: 2)
TECNOSCIENZA: Italian Journal of Science & Technology Studies     Open Access   (Followers: 1)
Temas y Debates     Open Access  
The Scientific World Journal     Open Access  
The Social Studies     Hybrid Journal   (Followers: 5)
The Winnower     Open Access  
Theoria     Full-text available via subscription   (Followers: 3)
THEORIA : An International Journal for Theory, History and Foundations of Science     Full-text available via subscription  
Trakya University Journal of Natural Sciences     Open Access  
Transactions of the Kansas Academy of Science     Full-text available via subscription   (Followers: 1)
Transactions of Tianjin University     Full-text available via subscription  
Trends : Journal of Sciences Research     Open Access   (Followers: 1)

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Momona Ethiopian Journal of Science
Number of Followers: 4  

  This is an Open Access Journal Open Access journal
ISSN (Print) 2073-073X - ISSN (Online) 2220-184X
Published by African Journals Online Homepage  [263 journals]
  • Theoretical analyses of superconductivity in iron based superconductor
           Ba1−xKxFe2As2

    • Authors: Tadesse Desta, Gebregziabher Kahsay, Pooran Singh
      Abstract: This paper focuses on the theoretical analysis of superconductivity in iron based superconductor Ba1−xKxFe2As2. After reviewing the current findings on this system, we suggest that phononexciton combined mechanism gives a right order of  superconducting transition temperature (TC) for Ba1−xKxFe2As2 . By developing a model Hamiltonian for the system under consideration, using double time  temperature dependent Green’s function formalism and a suitable decoupling approximation technique, we have analyzed theoretically the superconductivity of iron-based superconductor Ba1−xKxFe2As2. Furthermore, by using the  experimental and plausible theoretical values of the parameters in the obtained expressions, phase diagrams of superconducting transition temperature (TC) versus electron coupling constant (λe) and superconducting transition temperature (TC) versus superconducting gap parameter (Δhave been plotted. Our findings demonstrate that, as the electron coupling constant (λe) increases the superconducting transition temperature (TC) increases and vice versa and also as the temperature increases the superconducting order parameter decreases and vanishes at the transition temperature (TC) for Ba1−xKxFe2As2. Our findings are in a broad agreement with the experimental observations.Keywords: Iron based Superconductors, Green’s Function formalism,   Superconducting order parameter, Ba1−xKxFe2As2.
      PubDate: 2017-11-30
      Issue No: Vol. 9, No. 2 (2017)
       
  • Global Variations of Ionospheric Total Electron Content (TEC) Derived from
           GPS Global Ionospheric Maps

    • Authors: Hintsa Gebreselasse, Gebregiorgis Abraha
      Abstract: This paper is aimed to investigate diurnal, monthly and seasonal variation of  ionospheric total electronic content (TEC) obtained from two GPS satellites IGS and COD and to inspect mean VTEC Correlation between the two satellites by the year  of 2008. TEC is defined by the integral of electron density in a 1 m2 column along  the signal transmission path. It is an important parameter to monitor possible space weather impacts. The processed and archived data taken from IGS and COD  satellites has been imported in to a MATLAB code which gave us the results of the  value of VTEC. Results of the two satellites revealed that, Out of the selected  equinox and solstice day’s maximum value of TEC is recorded on March 20/2008  over North and South west equator due to the maximum solar radiation reaching to  the ionosphere of the Earth. On the contrary, the Minimum peak ionospheric TEC  value is recorded on June 21/2008 over south Asia particularly Srilanka and  Bangladesh due to emission of low solar radiation. As regards to monthly variations  of ionospheric TEC, results of IGS and COD satellites show that highest mean TEC  value is recorded on March and July recorded the least peak TEC value. Results  regarding to seasonal variation also revealed that E-Season recorded maximum  TEC value and least TEC value is recorded on J-Season. The observations of the two satellites also show that the mean TEC value presents stronger solar activity sensitivity at lower-latitude bands than the middle and high latitudes. In general,  there was a very high correlation between Mean TEC value recorded by IGS and COD satellites by the year of 2008 in all low, middle and high latitudes.
      Keywords: IGS and COD satellites, GPS, Ionosphere, Low, middle and  high-latitudes, TEC.
      PubDate: 2017-11-30
      Issue No: Vol. 9, No. 2 (2017)
       
  • Hydrothermal gold mineralization and structural controls near May Hibey,
           Northwestern Tigray, Northern Ethiopia

    • Authors: Mickiale Giday, Bheemalingeswara Konka
      Abstract: Ezana Mining Development Company has recently reported presence of gold  mineralization near May Hibey area, western Tigray, northern Ethiopia. It is in association with hydrothermal quartz veins within the Neoproterozoic low grade  basement rocks, metavolcanics and metasedimentary rocks. Structural data suggests four phases of deformations and NE-SW trending foliation is the prominent one among others. Among different generations of veins, NNE, NS and NNW trending third  generation quartz veins are gold-bearing and presence of a narrow shear zone with  dextral sense of movement trending NW-SE is significant interms of mineralization. Hydrothermal alterations are dominated by chloritization and sericitization. Core  samples from shear zone within the sericite-quartz schist and quartz porphyry rocks  shows presence of pyrite, pyrrhotite, sphalerite, chalcopyrite, galena and gold in  decreasing order of abundance. Gold mineralization is closely associated with the sericite and carbonization alteration zone. Based on mineral association, alteration,  deformation, texture, and paragenetic scheme, it is suggested that the mineralization is a syn-orogenic variety formed in an island arc tectonic setting.
      Keywords: Quartz veins, Shear zones, Gold, Petrography, Geochemistry, MayHibey, Ethiopia.
      PubDate: 2017-11-30
      Issue No: Vol. 9, No. 2 (2017)
       
  • Geological and Geomechanical Properties of Abraha-Atsibha and Wukro
           

    • Authors: Asmelash Abay, Gebreslassie Mebrahtu, Bheemalingeswara Konka
      Abstract: Globally well-known ancient rock-hewn churches are present in Ethiopia in general and particularly in the central and eastern parts of Tigray regional state. They are important sites of heritage and tourism. Most of them are facing destabilization  problem in different degree due to natural and anthropogenic factors. Among the affected, two churches hewn into sandstone located near Abreha-Atsibaha and  Wukro (Kirkos/Cherkos church) in Tigray region were chosen for detailed study in  terms of geological and engineering geological condition of the rocks in to which  they are hewn. Both of them are affected by weathering and seepage. Both are  carved into Mesozoic Adigrat sandstone that occupy higher elevations in  topography, red in color and with iron and silica-rich alternating bands. Petrographic data suggest that the rock is dominated by quartz followed by feldspars; opaque and heavy minerals; pore spaces and carbonate/iron/silica cement. The rock is  characterized by low to medium unconfined compressive strength. The alternating  bands with varying mineralogical composition differ in mechanical properties and are responding differently to weathering and erosion. This is resulting in the  development of minor spalling, pitting etc in the pillars, walls and roofs of the  churches. Keeping the geological condition in view remedial measures are to be planned to minimize deterioration with time.Keywords: Geological, Geomechanical, Rock hewn-Church, Abraha-Atsibaha, Tigray, Ethiopia.
      PubDate: 2017-11-30
      Issue No: Vol. 9, No. 2 (2017)
       
  • Evaluation of land suitability for selected tree species in the Mesozoic
           Highlands of Ethiopia

    • Authors: Kassa Teka, Yemane Welday
      Abstract: This paper aimed at evaluating the potential of the different soil attributes for plantation of selected forest trees (Faidherbia albida, Eucalyptus camaldulensis and Balanitus aegiptica) dominantly grown in the northern highlands of Ethiopia. The study was conducted at Korir watershed, northern Ethiopia. The method used to evaluate the land suitability was based on the FAO approach for land evaluation for forestry. The results of the evaluation revealed that suitability classes of these trees range from highly suitable (S1) to permanently not suitable (N). Eucalyptus camaldulensis was highly suitable on the relatively gentle valley bottom and foot slope (6% of the area) having greater soil depth while unsuitable in majority (about 58%) of the area. Both Faidherbia albida and Balanitus aegyptiaca were suitable in more than 85% of the study area. The major limiting factors were the steep slope and shallow soil depth in major part of the area. Hence, evaluating the land potential for individual species and assigning these species based on their land requirements should be done before plantation so as to increase the trees' survival rate.Keywords: Faidherbia albida, Eucalyptus camaldulensis, Balanitus aegiptica, Suitability, Ethiopia
      PubDate: 2017-11-30
      Issue No: Vol. 9, No. 2 (2017)
       
  • Effect of different cereal blends on the quality of Injera a staple food
           in the highlands of Ethiopia

    • Authors: Addis Abraha, Fetien Abay
      Abstract: Majority of the Ethiopian population are dependent on tef (Eragrostis tef (Zucc)  trotter) flour to make injera, a staple food in Ethiopia, although injera could be made  from different cereals. The price of tef, however, is high and the yield potential of the  crop is low. Thus, searching for alternative cheaper grains and developing a blend of  different cereal flours that can produce injera of acceptable quality and improved  nutritional value would be important. This study was conducted to evaluate the  sensory quality of injera made from a blend of different cereals (Tef, barley, sorghum  and maize) with differing ratios: 100, 75, 50 and 25%. The sensory evaluation of  injera was conducted at Mekelle University in a replicated trial. The results  revealed  significant differences among the cereal flour blends in injera texture,  mouth feeling, suppleness and overall rate, while colour, taste and the appearance of injera surface gas holes were non- significant. Injera made from 100% tef flour got the highest preference rank in terms of the texture, mouth feeling, suppleness and overall ratings. Injera made from 50:50 tef + barley blend was the second best in  both texture and suppleness followed by 50:50 tef + sorghum, 50: 50 tef + maize  blends and tef + barley + sorghum blend of equal ratio. Similarly, results from blend of tef + barley + maize, tef + sorgum + maize and from the four varietal blends in  equal ratios produced very good injera quality. From the study results injera quality ranked next to sole tef (tef + barley, tef + sorghum, tef + maize in 50:50 blends and tef + barley + sorghum in equal ratios) could be used as an alternative option for  injera utilization and could provide nutritional and dietary benefits to consumers.Keywords: Sensory attributes, Injera quality, cereal flour blends, Tef, Ethiopia.
      PubDate: 2017-11-30
      Issue No: Vol. 9, No. 2 (2017)
       
  • Effect of combined application of organic and mineral nitrogen and
           phosphorus fertilizer on soil physico-chemical properties and grain yield
           

    • Authors: Tamado Tana, Mitiku Woldesenbet
      Abstract: Low soil fertility is one of the major factors limiting the yield of barley in Kaffa Zone, south-western Ethiopia. The problem is more severe in the Zone due to soil erosion and nutrient leaching caused by heavy and continuous rainfall. Thus, field  experiment was conducted to assess the effect of combined organic and mineral  nitrogen (N) and phosphorus (P) on selected soil physico-chemical properties and  on grain yield of food barley in Ghimbo and Adiyo districts, south-western Ethiopia. Fourteen treatments comprising two organic fertilizer rates, i.e. 2.5 and 5 t ha−1 of Farm Yard Manure (FYM) and Vermicomost (VC) combined with three levels of  mineral NP (25, 50 and 75% of recommended rates of NP), 100% recommended  rate of inorganic NP (23 kg N ha-1 and 46 kg P2O5 ha-1) and no fertilizer  application (control) in randomized complete block design on clay soil in Ghimbo and clay loam soil in Adiyo with three replications. Results indicated that the application of FYM in combination with different levels of recommended rates of inorganic N and P significantly improved most of the soil physico-chemical properties and  significantly increased the grain yield of food barley over the application of 100%  mineral NP alone and the control. The application of 5 t FYM ha−1 in combination  with 75% recommended rates of inorganic N and P (17.25 kg N ha−1 and 34.5 kg  P2O5 ha−1) was found to be superior and increased soil organic carbon content by 36 and 44.6%, available P by 70.5 and 78.2%, available K by 42.5 and 26.3%, and increased yield of barley by 76.8 and 83.5% in Adiyo and Ghimbo, respectively, over the application of 100% recommended rate of inorganic N and P only. Therefore, it can be concluded and recommended that the application of 5 t FYM ha−1 in combination with 75% of the recommended rates of inorganic N and P  (17.25 kg N ha−1 and 34.5 kg P2O5 ha−1) can improve soil fertility and can  increase yield of food barley in the study area.
      Keywords: Farmyard manure, Nitrogen, Phosphorous, Vermicompost, Ethiopia.
      PubDate: 2017-11-30
      Issue No: Vol. 9, No. 2 (2017)
       
  • Isolation and characterization of efficient Phosphate Solubilizing
           Bacillus (PSB) from different agro-ecological zones of Tigray soil,
           Ethiopia

    • Authors: F.G. Kibrom, W. Alemayehu, V.R. Prakasam, W. Kiros
      Abstract: Applications of biofertilizer have great practical importance for increasing fertility of the soil and reducing environmental pollution. Screening and characterizing phosphate solubilizing Bacillus (PSB) strains from different agroecologies of Tigray  soil and in vitro assessment for the adaptability under different abiotic stress would help in selecting the most efficient strain for use as biofertilizer. A total of 64 soil  samples were collected from different agro-ecological zones of Tigray and checked for the presence, capability and efficiency of PSB. Out of 64 soil samples 21 of them were phosphate solubilizing. These phosphate solubilizing strains again incubate at 37˚C for 48h on pikovskaya medium to see efficacy of phosphate solubilization.  Highest efficiency was recorded in MUB28, MUB47and MUB64 isolates and also  tolerant to acidity and alkaline up to pH4 and pH8, respectively. And difference was  recorded in saline tolerance among the strains: MUB47 is the most saline tolerance strain which tolerate saline up to 513mM of sodium chloride (NaCl) but MUB28 and MUB64 have tolerated saline up to 340mM of NaCl. The identification of efficient PSB candidate strains with salt & pH tolerant features in the soil sample could have an implication on the end-users to obtain the desired beneficial effect such as maintaining soil healthy, provision of adequate phosphorus from soil to the plant and improving crop yield of Tigray Agriculture. Based on the morphological, microscopic, biochemical and physiological characterization, it may be inferred that the diversity among these efficient PSB strains is low.
      Keywords: Biofertilizer, Phosphate solubilizing Bacillus, Efficiency, Diversity, Agroecology, Adaptability, Ethiopia.
      PubDate: 2017-11-30
      Issue No: Vol. 9, No. 2 (2017)
       
  • Modeling and optimization of the single-leg multi-fare class overbooking
           problem

    • Authors: Getachew Basa, Abdelkader Kedir
      Abstract: This paper presents a static overbooking model for a single-leg multi-fare class flight. A realistic distribution of no-show data in modeling the cost function was considered using data collected from the Ethiopian airlines. The overbooking model developed considers the interaction (i.e. the transfer of an extra passenger in a lower fare classes to higher fare class empty seat) between classes that may exist during boarding time. Furthermore, the overbooking problem is modelled in such a way that it could be  constrained by user defined constraints such as probability of loss of the revenue. The overbooking model developed was solved using derivatives that give a closed form  expression and Monte Carlo simulation with a derivative free optimization algorithm. A comparison of the revenue generated from no-overbooking policy, the closed form  solution, and the Monte Carlo simulation solution approach shows that the Monte Carlo simulation solution approach performs better. Generally, the numerical results show that the overbooking model is effective in determining the optimal number of overbooking for a number of classes and a variety of compensation cost plans.
      Keywords: Overbooking, Monte Carlo Simulation, Nelder Mead algorithm, Revenue management, Ethiopian Airline, Ethiopia.
      PubDate: 2017-11-29
      Issue No: Vol. 9, No. 2 (2017)
       
 
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