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Md. Tanvir Ahmad,Drishti Nandita,Tanvir Mohammad Maruf,Mohammad Hasanuzzaman Pabitra,Sabrina Islam Mony,Md. Shawkat Ali,Md. Sarwar Ahmed,Mohammad Shamsul Alam Bhuiyan 한국가금학회 2021 韓國家禽學會誌 Vol.48 No.2
This study investigated the morphological features, growth, and meat yield performance of Pekin (P), Nageswari (N), and their reciprocal F1 crossbreds (P♂×N♀ and N♂×P♀). A total of 301-day-old ducklings were reared in four different pens up to 20 weeks of age under intensive management conditions. Feeding and management practices were similar for all individuals throughout the experimental period. The morphology and plumage pattern of F1 crossbreds were similar to those of indigenous Nageswari ducks because of the dominant inheritance of the extended Black allele (E locus). Genotype had significant differences (P<0.05) among the four genotypes in morphometric measurements, except wing and shank length. Growth performance was highly significant among the four genotypes (P<0.001) from one-day to 12 weeks of age. The average live weights of P, N, P♂×N♀ and N♂×P♀ crossbred genotypes at 12 weeks of age were 2038.35±29.74, 1542.44±33.61, 1851.85±28.59 and 1691.08±27.80 g, respectively. Meat yield parameters varied significantly (P<0.05) among the different genotypes for all studied traits, except for liver and gizzard weight. Moreover, no significant differences (P>0.05) were observed between P and P♂×N♀ crossbred for important meat yield traits such as hot carcass weight, dressing%, back half weight, drumstick with thigh weight and breast meat weight. Remarkably, the P♂×N♀ crossbreed possesses 50% native inheritance, which contributes to better adaptation in a hot-humid environment. Our results revealed that the P♂×N♀ genotype could be suitable for higher meat production with better adaptability in the agro-climatic conditions of Bangladesh.
Effect of Low Cost Natural Minerals on Solid Refuse Fuel Gasification
( Tanvir Alam ),( Jang-soo Lee ),( Won-seok Yang ),( Se-won Park ),( Sang-yeop Lee ),( Gun-ho Han ),( Youn-ouk Jeong ),( Yong-chil Seo ) 한국폐기물자원순환학회(구 한국폐기물학회) 2017 한국폐기물자원순환학회 심포지움 Vol.2017 No.1
Waste gasification is a promising pathway to convert carbonaceous materials into valuable end products through different synthesis routes, besides the efficient production of power and useable heat. Solid refuse fuel (SRF), which is an alternative fuel produced from the combustibles in municipal solid waste (MSW) and composed of waste plastic, paper, textiles, wood, etc., is one of the main topics in waste gasification nowadays. In this study, an effort was made to do SRF gasification using low cost natural minerals as a bed material to analyze the effect of low cost minerals on gas quality and yield. It is believed that low cost minerals like dolomite and lime usually shows some catalytic effect in promoting hydrocarbon destruction; by cracking reaction, steam reforming reaction and CO<sub>2</sub> reforming reactions. From our previous study, we found that optimum conditions for SRF gasification is ER 0.2, at 950 ℃ temperature in a fixed bed reactor. Thus, experiments were conducted at these conditions by measuring the characteristics of producer gas, concentration of gaseous pollutants and tar. Also, the lower heating value (LHV) of product gas, cold gas efficiency (CGE), carbon conversion (Cc), and residue yield (Ry) were analyzed. Results showed that uses of low cost natural minerals increased the syngas yield. It also increased LHV, CGE and Cc of producer gas. Uses of minerals also successfully decreased the residue yield and tar concentration. However, it increased the concentration of gaseous pollutants a bit, but still the concentration was much less than the allowable limit. In terms of overall performance, dolomite showed comparatively better performance than lime.
Simple, Robust & User Friendly CAPTCHA ‘InstaCap’ for Web Security
Tanvir Ahmed,Kaiser Ahmed Tushar,Sunjida Islam Nova,Md. Mahbubur Rahman 보안공학연구지원센터 2016 International Journal of Hybrid Information Techno Vol.9 No.1
Nowadays security matter is a great challenge in web-based systems and we are using various types of HIP to defend malwares in web. But today’s conventional HIP models are able to defend bots but make a user ireful. This paper will focus on a new and simple model of CAPTCHA to defend bot-attack. This model makes a user easily to pass and also amuse them with its simplicity. Considering computational complexity, we are using a thin algorithm with some other technical tricks to make it both robust & simple.
The Hybrid Pseudo Random Number Generator
Tanvir Ahmed,Md. Mahbubur Rahman 보안공학연구지원센터 2016 International Journal of Hybrid Information Techno Vol.9 No.7
Random number generation is an art and science of deterministically generating a Sequence of numbers that is difficult to distinguish from a true random sequence. It is become important tool in cryptography to generate secrete key. There are so many approaches to generate a pseudo random number. But they have some limitations too. In this paper we represent a new random number generation algorithm with the help of existing conventional methods & some new tricks to enhance the programs randomness. We already know some methods like mid-square or congruent. But, in our random numbers, we just use a congruential method which is pretty much different with conventional methods. That’s why we can consider it as a hybrid method of pseudo random number generator.
Performance of Cement Mortars under Tannery Wastewater
Tanvir Manzur,Sinha Lamia Sultana,Samira Mahmud,Sifat Azad Papry,Swakshar Saha,Mahbuboor Rahman Choudhury 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.11
This research studied the performance of Ordinary Portland Cement (OPC) and Portland Composite Cement (PCC) composites when exposed to tannery wastewater (TWW), which is generated in large quantities in different tannery industries in Bangladesh. With increasing prospects for tanning industries in the country, selection of suitable construction material will enable sustainable development in this sector. TWW consists of several chemicals that have detrimental effects on concrete. Performances of OPC and PCC were measured in terms of strength, expansion, and weight loss. Microstructures of the test specimens were also studied through Scanning Electron Microscopy (SEM), X-ray Powder Diffraction (XRD), and Energy-dispersive Spectroscopy (EDS) analysis. Results revealed that PCC test specimens performed better compared to those of OPC in terms of strength and degradation when exposed to TWW. The inferences made from this study will be helpful for selection of suitable cement type in future structures exposed to similar severe conditions.
DC electrical conductivity of nano-composite polystyrene–titanium–arsenate membrane
Tanvir Arfin,Faruq Mohammad 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.6
In continuation to our previous work with nano-composite polystyrene–titanium–arsenate (PS–Ti–As),we further extended the characterization by means of DSC, TEM and mercury porosimetry measurements. In addition to the extended characterization, we also investigated the DC electrical conductivity behaviour of the PS–Ti–As composite membrane under different time, temperature and electrolyte conditions. The conductivity of the membrane investigated in the temperature region of 30–200 8C using a four-in-line probe DC measurement and in the semi-conductor region of 10-5–10-3 S cm-1, found to obey the Arrhenius equation. From the time and temperature dependent conductivity studies on the HCl doped composite, it was observed that the conductivity increases with increase of temperature until 100 8C and further decreased with time during 120–160 8C, which can be attributed to the loss of HCl dopant molecules and blocking of the chemical reactions associated with the dopant. Further, we studied the stability of DC electrical conductivity retention in an oxidative environment by two slightly different techniques viz. isothermal and cyclic.
Tanvir H. Dar,Rubiada Shakeel,Shusheel Verma 한국작물학회 2018 Journal of crop science and biotechnology Vol.21 No.1
The present study provides an assessment of genetic variability and relationship within and between different cultivars of maize grown across the Rajouri region of the Pir Panjal Himalaya, utilizing morphological and ISSR markers. Morphological descriptors showed significant diversity among cultivars; on morphological cluster analysis, the cultivars 9 and 7 were more related, while cultivars 10 and 3 were distinct. Fifty accessions (5 from each cultivar) were characterized using a DNA-based molecular marker, ISSR. In all, 108 amplification products were generated with 17 ISSR primers, 6.35 fragments with an average \per primer. Out of these, 83 were found to be polymorphic with an overall percentage polymorphism of 75.2%. Total genetic diversity (Ht) and the mean genetic diversity estimated within populations (HS) was 0.2613 and 0.0803, respectively. Gene flow (Nm) and Coefficient of gene differentiation (Gst) among the cultivars was 0.2220 and 0.6926, respectively. Nei’s genetic diversity index (H) and (I) were the lowest for cultivar 10 (H = 0.037; I = 0.056) and the highest for cultivar 8 (H = 0.121; I = 0.176). Analysis of molecular variance revealed 35% within group and 65% among group genetic diversity. Based on cluster analysis, cultivar 10 appeared distinct from rest of the cultivars. The high genetic diversity detected in the present study can be utilized in maize breeding programs, wherein the elite genotypes could be crossed with the existing cultivars to form novel gene and trait combinations.