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  Subjects -> ENGINEERING (Total: 2284 journals)
    - CHEMICAL ENGINEERING (192 journals)
    - CIVIL ENGINEERING (184 journals)
    - ELECTRICAL ENGINEERING (102 journals)
    - ENGINEERING (1208 journals)
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ENGINEERING (1208 journals)                  1 2 3 4 5 6 7 | Last

Showing 1 - 200 of 1205 Journals sorted alphabetically
3 Biotech     Open Access   (Followers: 7)
3D Research     Hybrid Journal   (Followers: 19)
AAPG Bulletin     Hybrid Journal   (Followers: 5)
AASRI Procedia     Open Access   (Followers: 15)
Abstract and Applied Analysis     Open Access   (Followers: 3)
Aceh International Journal of Science and Technology     Open Access   (Followers: 2)
ACS Nano     Full-text available via subscription   (Followers: 227)
Acta Geotechnica     Hybrid Journal   (Followers: 7)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 5)
Acta Polytechnica : Journal of Advanced Engineering     Open Access   (Followers: 2)
Acta Scientiarum. Technology     Open Access   (Followers: 3)
Acta Universitatis Cibiniensis. Technical Series     Open Access  
Active and Passive Electronic Components     Open Access   (Followers: 7)
Adaptive Behavior     Hybrid Journal   (Followers: 11)
Adıyaman Üniversitesi Mühendislik Bilimleri Dergisi     Open Access  
Adsorption     Hybrid Journal   (Followers: 4)
Advanced Engineering Forum     Full-text available via subscription   (Followers: 6)
Advanced Science     Open Access   (Followers: 5)
Advanced Science Focus     Free   (Followers: 3)
Advanced Science Letters     Full-text available via subscription   (Followers: 7)
Advanced Science, Engineering and Medicine     Partially Free   (Followers: 7)
Advanced Synthesis & Catalysis     Hybrid Journal   (Followers: 17)
Advances in Artificial Neural Systems     Open Access   (Followers: 4)
Advances in Calculus of Variations     Hybrid Journal   (Followers: 2)
Advances in Catalysis     Full-text available via subscription   (Followers: 5)
Advances in Complex Systems     Hybrid Journal   (Followers: 7)
Advances in Engineering Software     Hybrid Journal   (Followers: 25)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 15)
Advances in Fuzzy Systems     Open Access   (Followers: 5)
Advances in Geosciences (ADGEO)     Open Access   (Followers: 10)
Advances in Heat Transfer     Full-text available via subscription   (Followers: 21)
Advances in Human Factors/Ergonomics     Full-text available via subscription   (Followers: 25)
Advances in Magnetic and Optical Resonance     Full-text available via subscription   (Followers: 9)
Advances in Natural Sciences: Nanoscience and Nanotechnology     Open Access   (Followers: 28)
Advances in Operations Research     Open Access   (Followers: 11)
Advances in OptoElectronics     Open Access   (Followers: 5)
Advances in Physics Theories and Applications     Open Access   (Followers: 12)
Advances in Polymer Science     Hybrid Journal   (Followers: 41)
Advances in Porous Media     Full-text available via subscription   (Followers: 4)
Advances in Remote Sensing     Open Access   (Followers: 37)
Advances in Science and Research (ASR)     Open Access   (Followers: 6)
Aerobiologia     Hybrid Journal   (Followers: 1)
African Journal of Science, Technology, Innovation and Development     Hybrid Journal   (Followers: 4)
AIChE Journal     Hybrid Journal   (Followers: 29)
Ain Shams Engineering Journal     Open Access   (Followers: 5)
Akademik Platform Mühendislik ve Fen Bilimleri Dergisi     Open Access  
Alexandria Engineering Journal     Open Access   (Followers: 1)
AMB Express     Open Access   (Followers: 1)
American Journal of Applied Sciences     Open Access   (Followers: 28)
American Journal of Engineering and Applied Sciences     Open Access   (Followers: 11)
American Journal of Engineering Education     Open Access   (Followers: 9)
American Journal of Environmental Engineering     Open Access   (Followers: 16)
American Journal of Industrial and Business Management     Open Access   (Followers: 23)
Analele Universitatii Ovidius Constanta - Seria Chimie     Open Access  
Annals of Combinatorics     Hybrid Journal   (Followers: 3)
Annals of Pure and Applied Logic     Open Access   (Followers: 2)
Annals of Regional Science     Hybrid Journal   (Followers: 7)
Annals of Science     Hybrid Journal   (Followers: 7)
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 2)
Applicable Analysis: An International Journal     Hybrid Journal   (Followers: 1)
Applied Catalysis A: General     Hybrid Journal   (Followers: 6)
Applied Catalysis B: Environmental     Hybrid Journal   (Followers: 9)
Applied Clay Science     Hybrid Journal   (Followers: 4)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 12)
Applied Magnetic Resonance     Hybrid Journal   (Followers: 3)
Applied Nanoscience     Open Access   (Followers: 7)
Applied Network Science     Open Access  
Applied Numerical Mathematics     Hybrid Journal   (Followers: 5)
Applied Physics Research     Open Access   (Followers: 3)
Applied Sciences     Open Access   (Followers: 2)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 4)
Arabian Journal for Science and Engineering     Hybrid Journal   (Followers: 5)
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 4)
Archives of Foundry Engineering     Open Access  
Archives of Thermodynamics     Open Access   (Followers: 7)
Arid Zone Journal of Engineering, Technology and Environment     Open Access   (Followers: 1)
Arkiv för Matematik     Hybrid Journal   (Followers: 1)
ASEE Prism     Full-text available via subscription   (Followers: 3)
Asian Engineering Review     Open Access  
Asian Journal of Applied Science and Engineering     Open Access   (Followers: 1)
Asian Journal of Applied Sciences     Open Access   (Followers: 2)
Asian Journal of Biotechnology     Open Access   (Followers: 8)
Asian Journal of Control     Hybrid Journal  
Asian Journal of Current Engineering & Maths     Open Access  
Asian Journal of Technology Innovation     Hybrid Journal   (Followers: 8)
Assembly Automation     Hybrid Journal   (Followers: 2)
at - Automatisierungstechnik     Hybrid Journal   (Followers: 1)
ATZagenda     Hybrid Journal  
ATZextra worldwide     Hybrid Journal  
Australasian Physical & Engineering Sciences in Medicine     Hybrid Journal   (Followers: 1)
Australian Journal of Multi-Disciplinary Engineering     Full-text available via subscription   (Followers: 2)
Autonomous Mental Development, IEEE Transactions on     Hybrid Journal   (Followers: 8)
Avances en Ciencias e Ingeniería     Open Access  
Balkan Region Conference on Engineering and Business Education     Open Access   (Followers: 1)
Bangladesh Journal of Scientific and Industrial Research     Open Access  
Basin Research     Hybrid Journal   (Followers: 3)
Batteries     Open Access   (Followers: 4)
Bautechnik     Hybrid Journal   (Followers: 1)
Bell Labs Technical Journal     Hybrid Journal   (Followers: 23)
Beni-Suef University Journal of Basic and Applied Sciences     Open Access   (Followers: 4)
BER : Manufacturing Survey : Full Survey     Full-text available via subscription   (Followers: 2)
BER : Motor Trade Survey     Full-text available via subscription   (Followers: 1)
BER : Retail Sector Survey     Full-text available via subscription   (Followers: 2)
BER : Retail Survey : Full Survey     Full-text available via subscription   (Followers: 2)
BER : Survey of Business Conditions in Manufacturing : An Executive Summary     Full-text available via subscription   (Followers: 3)
BER : Survey of Business Conditions in Retail : An Executive Summary     Full-text available via subscription   (Followers: 3)
Bharatiya Vaigyanik evam Audyogik Anusandhan Patrika (BVAAP)     Open Access   (Followers: 1)
Biofuels Engineering     Open Access  
Biointerphases     Open Access   (Followers: 1)
Biomaterials Science     Full-text available via subscription   (Followers: 9)
Biomedical Engineering     Hybrid Journal   (Followers: 16)
Biomedical Engineering and Computational Biology     Open Access   (Followers: 13)
Biomedical Engineering Letters     Hybrid Journal   (Followers: 5)
Biomedical Engineering, IEEE Reviews in     Full-text available via subscription   (Followers: 17)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 32)
Biomedical Engineering: Applications, Basis and Communications     Hybrid Journal   (Followers: 5)
Biomedical Microdevices     Hybrid Journal   (Followers: 8)
Biomedical Science and Engineering     Open Access   (Followers: 3)
Biomedizinische Technik - Biomedical Engineering     Hybrid Journal  
Biomicrofluidics     Open Access   (Followers: 4)
BioNanoMaterials     Hybrid Journal   (Followers: 2)
Biotechnology Progress     Hybrid Journal   (Followers: 39)
Boletin Cientifico Tecnico INIMET     Open Access  
Botswana Journal of Technology     Full-text available via subscription  
Boundary Value Problems     Open Access   (Followers: 1)
Brazilian Journal of Science and Technology     Open Access   (Followers: 2)
Broadcasting, IEEE Transactions on     Hybrid Journal   (Followers: 10)
Bulletin of Canadian Petroleum Geology     Full-text available via subscription   (Followers: 14)
Bulletin of Engineering Geology and the Environment     Hybrid Journal   (Followers: 3)
Bulletin of the Crimean Astrophysical Observatory     Hybrid Journal  
Cahiers, Droit, Sciences et Technologies     Open Access  
Calphad     Hybrid Journal  
Canadian Geotechnical Journal     Hybrid Journal   (Followers: 14)
Canadian Journal of Remote Sensing     Full-text available via subscription   (Followers: 41)
Case Studies in Engineering Failure Analysis     Open Access   (Followers: 8)
Case Studies in Thermal Engineering     Open Access   (Followers: 3)
Catalysis Communications     Hybrid Journal   (Followers: 6)
Catalysis Letters     Hybrid Journal   (Followers: 2)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 8)
Catalysis Science and Technology     Free   (Followers: 6)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 3)
Catalysis Today     Hybrid Journal   (Followers: 5)
CEAS Space Journal     Hybrid Journal  
Cellular and Molecular Neurobiology     Hybrid Journal   (Followers: 3)
Central European Journal of Engineering     Hybrid Journal   (Followers: 1)
CFD Letters     Open Access   (Followers: 6)
Chaos : An Interdisciplinary Journal of Nonlinear Science     Hybrid Journal   (Followers: 2)
Chaos, Solitons & Fractals     Hybrid Journal   (Followers: 3)
Chinese Journal of Catalysis     Full-text available via subscription   (Followers: 2)
Chinese Journal of Engineering     Open Access   (Followers: 2)
Chinese Science Bulletin     Open Access   (Followers: 1)
Ciencia e Ingenieria Neogranadina     Open Access  
Ciencia en su PC     Open Access   (Followers: 1)
Ciencias Holguin     Open Access   (Followers: 1)
CienciaUAT     Open Access  
Cientifica     Open Access  
CIRP Annals - Manufacturing Technology     Full-text available via subscription   (Followers: 11)
CIRP Journal of Manufacturing Science and Technology     Full-text available via subscription   (Followers: 14)
City, Culture and Society     Hybrid Journal   (Followers: 21)
Clay Minerals     Full-text available via subscription   (Followers: 9)
Clean Air Journal     Full-text available via subscription   (Followers: 2)
Coal Science and Technology     Full-text available via subscription   (Followers: 3)
Coastal Engineering     Hybrid Journal   (Followers: 11)
Coastal Engineering Journal     Hybrid Journal   (Followers: 4)
Coatings     Open Access   (Followers: 3)
Cogent Engineering     Open Access   (Followers: 2)
Cognitive Computation     Hybrid Journal   (Followers: 4)
Color Research & Application     Hybrid Journal   (Followers: 1)
COMBINATORICA     Hybrid Journal  
Combustion Theory and Modelling     Hybrid Journal   (Followers: 13)
Combustion, Explosion, and Shock Waves     Hybrid Journal   (Followers: 13)
Communications Engineer     Hybrid Journal   (Followers: 1)
Communications in Numerical Methods in Engineering     Hybrid Journal   (Followers: 2)
Components, Packaging and Manufacturing Technology, IEEE Transactions on     Hybrid Journal   (Followers: 26)
Composite Interfaces     Hybrid Journal   (Followers: 6)
Composite Structures     Hybrid Journal   (Followers: 254)
Composites Part A : Applied Science and Manufacturing     Hybrid Journal   (Followers: 178)
Composites Part B : Engineering     Hybrid Journal   (Followers: 226)
Composites Science and Technology     Hybrid Journal   (Followers: 190)
Comptes Rendus Mécanique     Full-text available via subscription   (Followers: 2)
Computation     Open Access  
Computational Geosciences     Hybrid Journal   (Followers: 13)
Computational Optimization and Applications     Hybrid Journal   (Followers: 7)
Computational Science and Discovery     Full-text available via subscription   (Followers: 2)
Computer Applications in Engineering Education     Hybrid Journal   (Followers: 6)
Computer Science and Engineering     Open Access   (Followers: 17)
Computers & Geosciences     Hybrid Journal   (Followers: 28)
Computers & Mathematics with Applications     Full-text available via subscription   (Followers: 5)
Computers and Electronics in Agriculture     Hybrid Journal   (Followers: 4)
Computers and Geotechnics     Hybrid Journal   (Followers: 10)
Computing and Visualization in Science     Hybrid Journal   (Followers: 5)
Computing in Science & Engineering     Full-text available via subscription   (Followers: 30)
Conciencia Tecnologica     Open Access  
Concurrent Engineering     Hybrid Journal   (Followers: 3)
Continuum Mechanics and Thermodynamics     Hybrid Journal   (Followers: 6)
Control and Dynamic Systems     Full-text available via subscription   (Followers: 8)
Control Engineering Practice     Hybrid Journal   (Followers: 42)
Control Theory and Informatics     Open Access   (Followers: 7)
Corrosion Science     Hybrid Journal   (Followers: 25)
CT&F Ciencia, Tecnologia y Futuro     Open Access  

        1 2 3 4 5 6 7 | Last

Journal Cover Bangladesh Journal of Scientific and Industrial Research
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   ISSN (Print) 0304-9809
   Published by Bangladesh Journals Online Homepage  [109 journals]
  • Chemometrics assisted method for classification of mango juice by FTIR
           spectroscopic data

    • Authors: MN Uddin, AK Majumder, S Ahamed, BK Saha, B Mumtaz
      Pages: 73 - 80
      Abstract: Commercial mango juices are adulterated with heavy use of simple sugars in Bangladesh which poses a serious threat to public health. The present study is aimed to develop chemometrics assisted method for classification of commercial mango juices as adulterated or not with excessive use of glucose, fructose and sucrose with FTIR spectral data. Two statistical techniques, Artificial Neural Network (ANN) and Partial Least Squares-Discriminant Analysis (PLS-DA) have been assessed for their efficiencies in classification in this regard. Before calibration, spectral data were preprocessed with de-noising techniques, Savitzky-Golay (S-G) filtering. Concentration of simple sugars were classified as within or over certain limits. Here spectral values of 64 synthetic mixture solutions are used as training data to develop models and 15 spectral data of real mango juice are used as test data. PLS-DA shows better classification performance over lowercase ANN. From the findings, we develop a method for classification of mango juices adulterated with heavy use of simple sugars (glucose, fructose and sucrose). Therefore, it is a simple and cheap method to classify mango juices as adulterated or safe for consumers, manufacturers and quality regulating authorities.Bangladesh J. Sci. Ind. Res. 52(2), 73-80, 2017
      PubDate: 2017-06-13
      DOI: 10.3329/bjsir.v52i2.32909
      Issue No: Vol. 52, No. 2 (2017)
       
  • Effects of feeding zooplankton, Moina macrocopa (Straus, 1820) on the
           growth of Nile tilapia Oreochromis niloticus L.

    • Authors: MR Islam, MR Hassan, M Begum, NJ Punom, MK Begum, N Sultana, MS Rahman
      Pages: 81 - 88
      Abstract: Studies were carried out on the growth performance of Tilapia fry, Oreochromis niloticus cultured with zooplankton, Moina macrocopa in comparison to commercial feed. Three types of feed were used in three treatments where treatment-1 was fed with handmade feed (control), treatment-2 with commercial feed and treatment-3 with live zooplankton M. macrocopa. Thirty fry were stocked in each 60 L aquarium for a rearing period of 56 days. The fishes were fed twice a day at 90-400 Moina/individual fish for first 20 days, then 500-850 Moina/individual fish for 15 days and 900-1250 Moina/individual fish for remaining days. Sampling was done at 14 days interval. The growth performance of M. macrocopa was higher in the treatment fed with Spirulina which was 6350 individuals/ L of water and in the treatment fed with yeast it was 5100 individuals/L of water at 12th days. The study showed that condition factor of tilapia fry found in treatment-3 fed with M. macrocopa was comparatively higher (2.18±0.09) than that of treatment-2 fed with commercial feed (1.86±0.13) at a 56-day culture period. Average daily gain was significantly higher in the treatment-3 fed with M. macrocopa (0.13±0.01) than those of treatment-1 (0.06±0.01) and treatment-2 (0.08±0.01). The best value of feed conversion ratio and specific growth rate was found in treatment-3 fed with M. macrocopa than commercial feed and handmade feed. Protein content was significantly higher (15.91%) in treatment-3 than those of treatment-1 (10.96%) and treatment-2 (11.88%). The findings of this study suggest that growth parameters and body composition of Nile Tilapia was better in treatment-3 fed with M. macrocopa.Bangladesh J. Sci. Ind. Res. 52(2), 81-88, 2017
      PubDate: 2017-06-13
      DOI: 10.3329/bjsir.v52i2.32910
      Issue No: Vol. 52, No. 2 (2017)
       
  • Synthesis and characterization of mixed ligand catecholato-bis
           (diamine-mono-dithiocarbamato) vanadium (IV) complexes

    • Authors: B Begum, A Sarker, AKM Lutfor Rahman, NC Bhoumik
      Pages: 89 - 96
      Abstract: Diamine-mono-dithiocarbamates are mono-basic bidentate ligand forming stable complexes with transition metals. Mixed ligand catecholato-bis (diamine-mono-dithiocarbamato) vanadium (IV) complexes were synthesized and characterized using FT-IR, UV-visible and 1H-NMR spectroscopic techniques. The formation of vanadium complexes was confirmed by the disappearance of υS-H band in the complexes which was present in the ligands and incidence of υV-S and υV-O band in FT-IR spectra of the complexes. The mono-dithiocarbamate with one uncoordinated υNH/NH2 group was indicated by the presence of υN-H vibrational band in both the ligands and complexes. In the 1H-NMR spectra, the peak for –SH proton of ligands disappeared in the complexes suggest the formation of [VL2Cat] complex. Non-electrolytic nature of the synthesized complexes was established by their low molar conductance values. The +4 oxidation state of vanadium was confirmed by the electronic spectra of the complexes. On the basis of all physico-chemical data, a six-coordinated octahedral structure has been suggested for catecholato-bis (diamine-mono-dithiocarbamato) vanadium (IV) complexes.Bangladesh J. Sci. Ind. Res. 52(2), 89-96, 2017
      PubDate: 2017-06-13
      DOI: 10.3329/bjsir.v52i2.32913
      Issue No: Vol. 52, No. 2 (2017)
       
  • Nutrition of rice as influenced by reclamation techniques for acid sulfate
           soil in Cox’s Bazar

    • Authors: Md HR Khan
      Pages: 97 - 106
      Abstract: A field experiment was conducted for the reclamation of a Cheringa hot spot of acid sulfate soil manipulated by flash leaching followed by basic slag (BS; BS10 and BS20: basic slag at 10 and 20 t ha-1), aggregate size (A; A20 and A30: aggregate sizes of soil less than 20 and 20-30 mm) treatments under two different techniques (Tech 1: pyrite layer at top, jarosite layer at middle and top soil at the bottom of ridge; Tech 2: top soil at top, pyrite layer at middle and jarosite layer at the bottom of ridge). Nutritional responses to two cultivars of rice with the treatments were evaluated. The initial soil had very low pH (H2O); 3.4, and high EC; 1.6 m S-1, and pyrite content, 76 g kg-1. Magnesium content (5.38 c mol kg-1) of the soil was about 3 fold than that of Ca (1.71 c mol kg-1), and Al content (9.22 c mol kg-1) was at a highly toxic level. The average soil data of all the treatments, except for the control plots after harvesting of rice were increased by 1.5 units for soil pH and 12 to 463% for the contents of N, P, Ca and Mg, while the concentrations of Fe, Al, Na, Cl- and SO4 2- decreased by 27 to 93% compared with the initial soil. The highest N, P, K, Ca, and Mg contents in both the BR 14 and Pizam rice shoots at maturity were obtained by the A20BS30 followed by A20BS20≥A30BS30 treatments. The other treatments also resulted in a significant (p≤0.05) improved performance on plant nutrition compared with the control. The local Pizam exhibited the best responses under the Tech 2 in order of these nutrient uptakes. Sulfur content in the rice plants on control plots was high (1.8-2.1 g kg-1) but it decreased significantly by the different treatments.Bangladesh J. Sci. Ind. Res. 52(2), 97-106, 2017
      PubDate: 2017-06-13
      DOI: 10.3329/bjsir.v52i2.32919
      Issue No: Vol. 52, No. 2 (2017)
       
  • Ecology and abundance of Bellamya bengalensis (Lamarck, 1822)
           (Gastropoda:Viviparidae) in pond habitats of Rajshahi

    • Authors: BK Saha, MS Jahan, MA Hossain
      Pages: 107 - 114
      Abstract: Studies on the ecology and abundance of Bellamya bengalensis (Lamarck, 1822) was carried out in Rajshahi University Campus in pond habitat. The physico-chemical parameters viz. water temperature (27.6 ± 4.23 °C in 1995 and 27.4 ± 4.43 °C in 1996), water transparency (0.41± 0.03 cm in 1995 and 0.42 ± 0.04 cm in1996), sunshine (6.22 ± 1.98 hours in 1995 and 7.41 ± 1.56 hours in 1996), pH (7.78 ± 0.38 in 1995 and 7.84 ± 0.27 in 1996), DO (4.92 ± 0.75 mg/l in 1995 and 5.73 ± 1.5 mg/l in 1996) and CO2 (5.45 ± 2.06 mg/l in 1995 and 4.04 ± 1.34 mg/l in 1996) of different ponds were recorded.The physico-chemical parameters viz. water temperature (25.82 ± 4.87 °C in 1995 and 25.96 ± 5.4 °C in 1996), water transparency (0.37 ± 0.02 cm in 1995 and 0.4 ± 0.03 cm in 1996), pH (7.78 ± 0.08 in 1995 and 7.8 ± 0.12 in 1996), DO (3.1 ± 0.06 mg/l in 1995 and 2.86 ± 0.31mg/l in 1996) and CO2 (14.6 ± 0.76 mg/l in 1995 and 13.54 ± 1.53 mg/l in 1996) of ditches were recorded. The physico-chemical parameters viz. water temperature (30.18 ± 1.21 °C in 1995 and 30.07 ± 1.21 °C in 1996), pH (7.93 ± 0.3 in 1995 and 7.98 ± 0.3 in 1996), DO (4.93 ± 0.12 mg/l in 1995 and 4.97 ± 0.13 mg/l in 1996) and CO2 (5.63 ± 1.74 mg/l in 1995 and 5.57 ± 1.78 mg/l in 1996) of irrigated paddy field were determined. The rainfall was recorded as 123.36 ± 127.27 cm and 105.75 ± 111.11 cm during 1995 and 1996, respectively. Thirty five spp. of hydrophytes were identified. The minimum and maximum abundances per m2 were determined as 124.58 ± 58.93 and 133.33 ± 60.84 during the observation periods of 1995 and 1996, respectively.Bangladesh J. Sci. Ind. Res. 52(2), 107-114, 2017
      PubDate: 2017-06-13
      DOI: 10.3329/bjsir.v52i2.32920
      Issue No: Vol. 52, No. 2 (2017)
       
  • One step cyclocondensation of (thio) barbituric acid with chalcones in
           glacial acetic acid and phosphorous pentoxide, Part-II

    • Authors: K Akhter, ME Halim, SM Ahmed, PK Sarkar, F Akter, K Jahan, UKR Romman, MG Ahmed
      Pages: 115 - 124
      Abstract: A number of new 5, 7-diaryl-1,5-dihydro (or 1, 2, 3, 5-tetrahydro)- pyrano [2, 3-d] pyrimidin-2, 4-diones (or 2-thioxo-4-ones) (3a-g) have  been synthesized in one-step by cyclocondensation of barbituric acid or thiobarbituric acid (1) with arylideneacetophenones (2a-d), in glacial  acetic acid in the presence of phosphorous pentoxide. The structures of the compounds 3a-g have been determined by UV, IR, 1H NMR, 13C  NMR, mass spectral data and elemental analyses. The compounds 3a-g do not seem to be available in the literature.Bangladesh J. Sci. Ind. Res. 52(2), 115-124, 2017
      PubDate: 2017-06-13
      DOI: 10.3329/bjsir.v52i2.32921
      Issue No: Vol. 52, No. 2 (2017)
       
  • Lipid composition of Basella alba and Basella rubra leaves consumed in
           South- Western Nigeria: Nutritional implications

    • Authors: AJ Adesina, SO Adefemi
      Pages: 125 - 134
      Abstract: The levels of fatty acids, phospholipids and sterols were determined in the samples of Basella alba and Basella rubra commonly consumed  in the South-Western Nigeria by gas chromatography. Results showed that the crude fat levels were 4.40 and 4.41 % in the Basella alba and  Basella rubra samples respectively. The fatty acid composition of Basella alba and Basella rubra samples shows that the SFA was 26.0 and  24.9 %, MUFA was 1.19 and 1.24 % and PUFA was 72.5 and 73.8% respectively. The other quality parameters of Basella alba and Basella  rubra were found: PUFA/SFA, 2.79 and 2.97; MUFA/SFA, 0.046 and 0.050; n-6/n-3, 2.47 and 3.31; LA/ALA, 0.890 and 1.12 and EPSI  (PUFA/MUFA), 60.8 and 59.5 respectively. Phospholipids present in Basella alba and Basella rubra were 1679 and 1920 mg/100g respectively.  In the group of phytosterols, sitosterol was highest with values of 196 mg/100g and 275 mg/100g in Basella alba and Basella rubra samples respectively. Linear correlation at a = 0.05, df: n-1 showed that significant difference exists between the fatty acid, quality parameters of  the fatty acids phospholipids and sterols.Bangladesh J. Sci. Ind. Res. 52(2), 125-134, 2017
      PubDate: 2017-06-13
      DOI: 10.3329/bjsir.v52i2.32935
      Issue No: Vol. 52, No. 2 (2017)
       
  • Effect of some chemicals on incidence of poato soft rot disease in
           Bangladesh

    • Authors: MM Rahman, AA Khan, IH Mian, AM Akanda, MZ Alam
      Pages: 135 - 140
      Abstract: Bactericidal effect was investigated by chemicals against potato soft rot bacteria in vitro and in storage. The chemicals were acetic acid, boric acid, bleaching powder, lactic acid, calcium hydroxide, calcium chloride, potassium chloride and sodium hypo-chloride. Among eight  chemicals only three chemicals viz. acetic acid, boric acid and bleaching powder showed bactericidal activity against potato soft rot bacteria  Pectobacterium carotovorum subsp. carotovorum (E. carotovora subsp. carotovora) P-138 in vitro. Based on the results of in vitro experiment three chemicals, acetic acid, boric acid and bleaching powder were used to control soft rot disease of potato in storage. Fresh potato tubers were dipped in 0.2% solution/suspensions of acetic acid, boric acid and bleaching powder for 30 min. Then soft rot bacteria Pectobacterium carotovorum subsp. carotovorum P-138 was inoculated on potato. Finally potatoes were stored for 22 weeks in net bags in sterilized condition. All the three chemicals significantly decreased the infection rate, loss in weight and increased percentage of disease reduction (PDR) of potato. Boric acid was the most effective in controlling the soft rot disease of potato in storage followed by acetic acid and bleaching powder. So these chemicals may be used for seed purpose storage of potato tubers for year round storage at farmer’s level.Bangladesh J. Sci. Ind. Res. 52(2), 135-140, 2017
      PubDate: 2017-06-13
      DOI: 10.3329/bjsir.v52i2.32936
      Issue No: Vol. 52, No. 2 (2017)
       
  • Renewable energy from the waste soles through thermal pyrolysis-A novel
           approach

    • Authors: MA Hashem, AC Paul, S Hosen, A Hasan
      Pages: 141 - 146
      Abstract: Footwear is a booming sector in Bangladesh. Disposing of process residues from the footwear industries, especially production waste of thermoplastic rubber and polyvinyl chloride soles as well as human used soles is a big concern due to its non-biodegradability. In this work, waste thermoplastic rubber (TPR) and polyvinylchloride (PVC) soles were used as an energy source through the fixed-bed-fire-tube heating pyrolysis to reduce the pollution load. The experiments were performed at varying temperature within the range of 250°C to 450°C at every 100°C interval for each case. In pyrolysis oil, char and gas were produced from the both TPR and PVC soles; temperature increment was created more percentage of oil from the both soles. At same condition TPR sole was produced 12.3% more oil than PVC sole. The pyrolytic oils were made fractional distillation; obtained liquids were relatively greater in volume and low boiling range. The obtained liquids from the fractional distillation were exhibited more light fractions present in the pyrolytic polyvinyl chloride oil (PPVCO) than pyrolytic thermoplastic rubber oil (PTPRO). The process could be optimized for the large scale, which will offer advantages to reduce the environmental impact as well as the production of new product from the waste soles.Bangladesh J. Sci. Ind. Res. 52(2), 141-146, 2017
      PubDate: 2017-06-13
      DOI: 10.3329/bjsir.v52i2.32938
      Issue No: Vol. 52, No. 2 (2017)
       
  • Thermal properties of porcelain reinforced polyester resin composites

    • Authors: R Sultana, R Akter, MR Qadir, MA Gafur, MZ Alam
      Pages: 147 - 152
      Abstract: Porcelain reinforced polyester resin composites (PPCs) having different compositions have been prepared by compression molding. Thermal properties of PPCs were studied by means of TG-DTA and TMA. The influence of porcelain content on thermal properties of PPCs was studied in detail. Thermal conductivities of PPCs decreased from 0.00068 cal/cm sec°C to 0.00030 cal/cm sec°C by the addition of porcelain from 10 to 60%. The results of this study reveal their good thermal stabilities. The 50% degradation temperature of pure Polyester resin was 401.5°C, but that of the PPC-1, PPC-2 and PPC-4 were 406.3°C, 407.8°C, and 417.3°C respectively. The morphology of the composites was studied with scanning electron microscopy (SEM).Bangladesh J. Sci. Ind. Res. 52(2), 147-152, 2017
      PubDate: 2017-06-13
      DOI: 10.3329/bjsir.v52i2.32939
      Issue No: Vol. 52, No. 2 (2017)
       
  • Determination of vitamin A content from selected Nigerian fruits using
           spectrophotometric method

    • Authors: SO Aremu, CC Nweze
      Pages: 153 - 158
      Abstract: The vitamin A content of the fresh fruits was determined by the extraction and quantitative determination of the pro-vitamin A carotenoid-β-carotene. The Retinol Equivalent (RE) was then obtained using standard conversion formula. The result indicated that the fruit with the minimum vitamin A content and percentage among the six samples was found in mango 301.61 ± 1.03 (7%), which was followed closely by watermelon 350.12 ± 19.01 (8%), guava 504.1 ± 0.75 (11%), tomato 542.86 ± 20.20 (12%), pawpaw 683.93 ± 5.15 (16%) and the highest content was found in carrot 2054.10 ± 1.28 (46%) in (RE/100 g). Statistical calculations and analysis showed that there was significant difference in vitamin A content among the fruits (p<0.05). Thus, besides major nutrients fruits and vegetables contribute very good amount of micro nutrient-vitamin A from β-carotene.
      Bangladesh J. Sci. Ind. Res. 52(2), 153-158, 2017
      PubDate: 2017-06-13
      DOI: 10.3329/bjsir.v52i2.32940
      Issue No: Vol. 52, No. 2 (2017)
       
 
 
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