Browsing by Author "Rahman, M. M."

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A Federated Learning Approach for Type-2 Diabetes Detection Using a Naive Bayes Classifier
(, The International Diabetes Federation (IDF), 2023, 2023-10) Rahman, M. M.; Islam, Ashraful; Pasha, Syed Tangim; Islam, M. Usama; Alam, Md Zahangir
Federated learning (FL) is a new way of training machine learning models across decentralized devices without exchanging the raw data. This approach preserves privacy and promotes the development of more personalized models by exploiting the heterogeneity of data. Common phenomena of FL is to employ deep learning models. Nonetheless, simple machine learning models such as Naive Bayes have promising potentials for detecting diabetes mellitus in a FL environment. To explore the practical prospects of building a privacy-preserving model for identifying patients with diabetes mellitus, utilizing their individual data. A cohort of 103 persons are enrolled in this study. Each participant was sent a questionnaire to answer with their own personal data about their age, Body Mass Index (BMI), insulin level, glucose concentration, skin thickness of an individual. Subsequently, an initial model, built using the Pima Indian Diabetes dataset, was sent to their mobile devices [1]. The participants utilized the initial model to train with their own data. Following this, the model parameters are updated and sent to the server. The server aggregated the parameters and averaged them to make a global model. This completes a single iteration of federated learning life cycle. Participants are diversed in gender: male (60.2%) and female (39.8%); in age groups: 20-35 (14.6%), 36-50 (46.6%), 51-65 (38.8%). The work shows an accuracy of 89.32% and a precision of 88.89% for those having diabetes while 90.32% precision in detecting patients not having a diabetes mellitus. The number of communication rounds was 50 where in each round at least two participants participants in building federated model updates. Since one of the key reasons for using FL is to improve data privacy, quantifying the level of privacy is critical. An network intruder could decoded the model updates by examining the changes in the global model over time. However, a membership inference attack (MIA) is measured in various differential privacy (DP) budgets. DP aims to prevent this kind of inference by adding noise to the data (model updates). For instance, if the model update would normally be a weight change of +0.5, a noise from a Laplacian distribution with mean 0 is added. Hence, the resulting noisy update might then be +0.52. A naive bayes based federated learning system is built to detect diabetes mellitus (Type-2) preserving the privacy of user data at the first place.
A Zero-Equation Model for External Aerodynamics
(Research and Development Wing, MIST, 2023-06) Rahman, M. M.; Zhang, Xueting; Hasan, K.; Chen, Sheng
The zero-equation model (ZEM) has been generalized for aerodynamic applications by eliminating the thickness of boundary-layer (BL) dependency to construct the stress length parameter . The SED (Structural Ensemble Dynamics) postulate evaluates the using the order function based on universal multi-layer structures for wall turbulence. The SED concept is further employed to optimize the profiles of the turbulent kinetic energy and dissipation rate with turbulent BL flows. Results demonstrate that the multilayer ZEM receives a remarkable achievement in the prediction of wall-bounded turbulence and thus, prevails over the drawbacks encountered in most algebraic turbulence models.
Analysis of natural convective heat transport in homocentric annuli containing nanofluids with an oriented magnetic field using nonhomogeneous dynamic model
(Springer, 2017-02-28) Uddin, Md. Jashim; Rahman, M. M.; Alam, M. S.
In this paper, the time-dependent natural convective heat transport in homocentric annuli containing nanofluids accompanying an oriented magnetic field using a nonhomogeneous dynamic mathematical model is numerically investigated. The analysis is carried out for four different shapes of inner walls such as triangular, square, elliptical and cylindrical. The outermost cylindrical boundary of the annulus is regarded at an unvarying low temperature and undifferentiated thermal condition on the inner surface of the annulus is considered. A finite element method is implemented for finding the solutions to the nanofluid equations of the problem. The magnetite iron oxide–kerosene nanofluid has been taken to gain insight into the thermal fields and concentration levels in terms of isotherms and isoconcentrations, respectively. The local Nusselt number distributions along the interior and exterior boundaries have been displayed for various flow parameters of the problem. To find the best performer, the average Nusselt number enhancements are demonstrated varying four different shapes of inner wall for ten sorts of nanofluids compared to that of base fluids. Results show that the dispersion of local Nusselt number decreases with the increase in the nanoparticle diameter and Hartmann number, whereas it enhances with the increase in the measure of nanoparticle by volume, magnetic field inclination angle and Rayleigh number. It is also found that the inner shape of the annulus significantly affects the thermal flow as well as the Nusselt number. Full Text Link: https://doi.org/10.1007/s00521-017-2905-z
Convective Flow Of Micropolar Fluid In A Porous Medium With Variable Electric Conductivity, Surface Heat Flux And Nonuniform Heat Source (Or Sink)
(enertec, 2010) Rahman, M. M.; Uddin, Md. Jashim; Aziz, A.
This paper investigates the effects of the fluid electric conductivity, non-uniform heat source (or sink), suction and variable surface heat flux on the two-dimensional steady hydromagnetic convective flow of a micropolar fluid (in comparison with the Newtonian fluid) flowing along an inclined permeable flat plate embedded in a fluid saturated porous medium. The governing partial differential equations are transformed into locally similar ordinary differential equations and solved numerically. The local similarity solutions are presented graphically for the velocity distribution, microrotation, and the temperature profiles in the boundary layer. The data for the skin-friction coefficient and the local Nusselt number are tabulated for convenient use. The significance of the physical parameters on the flow field is discussed in detail. The results show that the skin-friction coefficient and the Nusselt number are lower for the micropolar fluid for both the cases of constant fluid electric conductivity and the variable fluid electric conductivity when compared with the Newtonian fluid. This observation is valid for both porous and non-porous media. The effect of temperature dependent heat generation is much stronger than the effect of surface dependent heat generation even in the presence of a porous medium, suction at the plate surface and variable surface heat flux. The results also show that effects of the fluid electric conductivity, non-uniform heat generation, suction, presence of porous medium and variable surface heat flux in a micropolar fluid are less pronounced compared with those in a Newtonian fluid.
CORRELATION AND PATH ANALYSIS IN SOME INDIGENOUS AND EXOTIC PROMISING CLONES OF SUGARCANE
(Sher-e-Bangla Agricultural University Research System, Sher-e-Bangla Agricultural University, Dhaka, Bangladesh, 2008-01) Rahman, M. M.; Mannarr, M. A.; Bhuiyan, M. S. R.
A study on the character association and relative contribution of different characters on' cane yield in sugarcane was conducted using 25 promising clones and two standard varieties. The characters considered were number of tiller, number of millable cane per hectare, number of millable cane per clump, stalk height, stalk girth, single stalk weight, number of green leaf. leaf length, leaf breadth, cane yield and sucrose percentage. In general, the genotypic correlations were higher than the corresponding phenotypic correlation. In most cases, there was a strong inherent relationship between the characters. The correlation coefficients between the number of millable cane per hectare, number of millable cane per clump, single stalk weight and cane yield were highly positive significant, but sucrose percentage, stalk girth, leaf length, leaf breadth and number of green leaf had significant negative correlation with cane yield. The path coefficient studies indicated that number of millable canes per hectare and single stalk weight were the most important contributors to cane yield per hectare. Hence, these two characters could be chosen as the most important selection criteria for the improvement of cane yield in sugarcane.
CULTURE SENSITIVITY PATTERNS OF BACTERIA ASSOCIATED WITH RESPIRA TORY ILLNESS IN HUMAN
(Sher-e-Bangla Agricultural University Research System (SAURES), Dhaka, Bangladesh, 2011-07) Islam, M.; Rahman, M. M.; Khan, M. S. R.; Hossain, M. M.; Hasan, M. K.
This study was designed to identify and determine in-vitro antibiotics sensitivity patterns of bacteria associated with respiratory illness of human. A total of 60 throat swab samples were aseptically collected from 3 age groups of 1-20 years (young), 21-40 years (adult) and 41-60 years (old). Isolated bacteria then subjected to determine their in-vitro antibiotic sensitivity patterns. From this study, it was observed that bacterial flora present in the throat swab of human with their percentage of distribution were Staphylococcus spp. (40.54%) of which Coagulase positive Staphylococcus (32.43%) and Coagulase negative Staphylococcus (8.11 %), Klebsiella spp. (24.325%), Pseudomonas spp. (18.92%), E. coli (8.11 %) and Bacillus spp. (8.11 %). Percentages of isolated bacteria in different age groups were 29.73% in young, 40.54% in adult and 29.73% in old. Among the isolates Coagulase positive Staphylococcus, Klebsiella and Pseudomonas were the predominant species. Percentages of Coagulase positive Staphylococcus spp. were high in age groups of 21-40 years (21.62%) whereas Klebsiella spp. were the predominant species of age groups of 1-20 years (10.81%) and 41-60 years (8.11%). Pseudomonas spp were the predominant species (8.11%) in age groups of 41-60 years. The isolated Coagulase positive Staphylococcus spp and Klebsiella spp were resistant 10 amoxicillin and ampicillin but sensitive to ciprofloxacin, enrofloxacin and norfloxacin. Isolated Pseudomonas spp. showed resistant properties against amoxicillin, ampicillin petloxacin, gentamycin and furazolidone but sensitive to ciprofloxacin and nortloxacin.
Design a slotted metamaterial microstrip patch antenna by creating three dual isosceles triangular slots on the patch and bandwidth enhancement
(IEEE, 2018-02-01) Paul, L. C.; Haque, M. A.; Haque, M. A.; Rashid, M. M. U.; Islam, M. F.; Rahman, M. M.
The aim of this work is to design and analysis the performance of a metamaterial (MTM) based microstrip patch antenna (MP A) by introducing three dual isosceles triangular slots on the metallic patch. At First, a conventional microstrip patch antenna is designed using Isola FR-408 (loss free) substrate material having dielectric constant of 3.75. Then the slotted microstrip patch antenna has been designed and verified as left handed metamaterial (LHM) with the help of Nicolson Ross Weir (NRW) method. All the simulations have been accomplished by CST microwave studio 2011. The bandwidth of the proposed MTM antenna is enhanced by 464.93% compared to our designed conventional MPA (77 MHz for conventional MPA and 435 MHz for metamaterial MPA) and the return loss is reduced from -11.89 dB to -55.34 dB and directivity is increased from 6.713 dB to 7.187 dB. The voltage standing wave ratio (VSWR) of the proposed metamaterial antenna is of 1.0034 which is very close to unity.
Design and analysis of four elements E, H and combined E-H shaped microstrip patch array antenna for wireless applications
(IEEE, 2018-02-01) Paul, L. C.; Akhter, M. S.; Haque, M. A.; Islam, M. R.; Islam, M. F.; Rahman, M. M.
In this paper, different shaped patch antenna and their array configurations have been designed and simulated by using advanced designed system (ADS) in order to improve the overall performance of microstrip patch antenna (MP A). FR4 dielectric material is used as substrate which has a dielectric constant of 4.4 and height of the dielectric substrate is 1 mm and loss tangent, tan δ is 0. Antennas are fed through 50 Ω microstrip feed line. Each array consists of corresponding four single elements. Different antenna performance parameters like return loss, bandwidth, directivity, gain & radiation efficiency were analyzed for all the proposed antennas.
Developing A Smart Control System Of Electrical Appliances By Computer Interfacing
(R&D Wing, MIST, 2011-02) Das, N.K.; BN, Capt. M.Ziauddin Alamgir; Das, C.K.; Hasan, M. M.; Rahman, M. M.; Alam, M. F.
The use of computer interfacing systems for controlling the device is spreading at an increasingly fast pace, with analogous wired system being substituted by computer interfaced systems alternatives in growing number of industries. As the technology progress many control system have been developed ranging from high end stuff to our common daily life. The main objective of this project is to develop a roadmap on communication and control technologies for distributed electrical equipments. Equipments located at any remote place can be monitored and controlled. The process is mainly to communicate between the two remote controlling device and setup connection between devices which are to be controlled. The main hallmark is to get access to the controlling section from any distance location in a convenient way and supervising the system accordingly. The speciality of this project is that the operator will able to control different devices at home/industry by using a single PC. An added advantage of this control system is that the operator will able to know the status of the device to be controlled from a remote place. Here, the algorithm of controlling any kind of electrical equipments is developed. The speeds of a DC motor are controlled as a test case and also monitor the voltage and current during different speed level of the motor.
DISTRIBUTION OF WIDTEFLY, Bemisia tabaci Gennadius ON MUNGBEAN IN MAJOR MUNGBEAN GROWING REGIONS OF BANGLADESHI
(Sher-e-Bangla Agricultural University Research System (SAURES), Dhaka, Bangladesh, 2009-01) Ali, M. R.; Rahman, M. M.
The study was conducted in the three mungbean growing locations/regions of Bangladesh viz., Bansal. Jessore and Gazipur during March 2005 to March 2006 to explore the distribution of whitefly. Bamisin (abaci Genn. and the incidence of Mungbean yel/ow mosaic virus (MYMV) disease infection in mungbean (Vigna radiata) as well to study the climatic factor(s) as the basis for regulating them. The incidence of whitefly and MYMV infection were the maximum in Barisal (253.7 adults and 82.90 nymphs/20 plants, and 37.33% leaves and 57.20% plants infection, respectively) and the lowest in Jessore (39.0 adults and 10. I 9 nymphs120 plants, and 18.20% leaves & 16.50% plants infection, respectively). The rate of MYMV infection in leaves and plants were positively correlated with the incidence of both whitefly adult and nymph. The climatic factors were attributed to the variations of whitefly incidence as well as performance of mungbean in locations. Among three locations, macroclimatic temperature (3 I .5°C), RH (84.44%) and rainfall (1.47 mm) as well as microclimatic temperature (25.6°C) and RH (77.8%) within crop canopy of mungbean were the highest in Jessore, which were detrimental to the incidence of whitefly. Conversely, macroclimatic temperature (28.4°q and RH (76.44%); microclirnatic temperature (21.53°(') and RH (73.73%) were the lowest in Barisal, which played as the favorable factors lor whitefly population. Both macro and microclirnatic temperature. RH and rainfall were negatively correlated to the incidence of whitefly. Accordingly, the incidence of whitefly and MYMV infection were the maximum in Barisal and minimum in Jessore and intermediate in Gazipur. Thus yield attributes were better and higher yield (1160.6 kg/ha) was obtained in Jessore, which was followed by Barisal (866.7 kg/ha), while the yield was minimum (414.7 kg/ha) in Gazipur.
ECO-FRIENDL Y MANAGEMENT OF SHOOT AND FRUIT BORER (Earias vittella FAB.) USING BOTANICALS AND BIO-CONTROL AGENT
(Sher-e-Bangla Agricultural University Research System (SAURES), Dhaka, Bangladesh, 2011-07) Afroz, R.; Rahman, M. M.; Ali, M. R.
A study was conducted at the Sher-e-Bangla Agricultural University, Bangladesh during May 2011 10 August 20 II to evaluate the effectiveness of botanicals and parasitoid for the management of okra shoot and fruit borer (Earias vittella Fab.). The experiment was laid out in a Randomized Complete Block Design (RCBD) comprising eight treatments viz., TI ; Neem oil @ 4mlll of water sprayed at 7 days interval, T2; Neem seed kernel extract @50 g/l of water sprayed at 7 days interval, TJ; Neem leaf extract @ 200gll of water at 7 days interval, T. ; Trichogramma evanescens @ 0.5g1plot at 7 days interval, T, ; Trichogramma evanescens @ 0.25g1plot at + neem oil @ 4mlll of water sprayed at 7 days interval, T6 ; Trichogramma evanescens @ 0.25g1plot + neem seed kernel extract @ 50gll sprayed at 7 days interval, T7; Trichogramma evanescells @ 0.25g1plot + neem leaf extract @ 200gll of water at 7 days interval, Ts ; Untreated control. Among the treatments T, (Spraying of neem oil @ 4mlll of water + release of Trichogramma evanescens egg parasitoid @ 0.25g1plot at 7 days interval) performed the best in terms of percent reduction of shoot infestation (96.50), flower bud infestation (83.33%) and fruit infestation by weight (86.90%).
Effects Of Thermophoresis And Brownian Motion On Unsteady Forced Convective Flow Of A Nanofluid Along A Porous Wedge With Variable Suction
(Research gate, 2015-10-10) Alam, Shariful; Sarower, Farhana; Rahman, M. M.; Uddin, Md. Jashim
This paper deals a numerical study of unsteady two-dimensional laminar forced convective hydrodynamic heat and mass transfer flow of a nanofluid along a porous wedge. The model incorporates the effects of thermophoresis and Brownian motion in the presence of variable suction. The dimensionless local similarity equations governing the model are solved by applying Nachtsheim-Swigert shooting iteration technique along with sixth order Runge-Kutta integration scheme. The simulated results are displayed graphically as well as in a tabular form for various values of the model parameters. The obtained numerical results indicate that the flow, temperature and nanoparticles volume fraction are significantly influenced by these parameters. Nanofluids have novel properties those make them potentially useful in many applications in heat and mass transfer. The present model is greatly influenced by the thermophoresis and Brownian motion; thus, can be applied in solving engineering and physical problems related to these mechanisms.
Effects of variable electric conductivity and non-uniform heat source (or sink)on convective micropolar fluid flow along an inclined flat plate with surfaceheat flux
(Elsevier, 2009-06-13) Rahman, M. M.; Uddin, Md. Jashim; Aziz, A.
Numerical simulations have been carried out to investigate the effects of the fluid electric conductivity and non-uniform heat source (or sink) on two-dimensional steady hydromagnetic convective flow of a micropolar fluid (in comparison with the Newtonian fluid) flowing along an inclined flat plate with a uniform surface heat flux. The local similarity solutions are presented for the non-dimensional velocity distribution, microrotation, and temperature profiles in the boundary layer. The significance of the physical parameters on the flow field is discussed in detail. The results show that the values of the skin-friction coefficient and the Nusselt number are higher for the case of constant fluid electric conductivity compared with those for the variable fluid electric conductivity. The effect of temperature dependent heat generation is much stronger than the effect of surface dependent heat generation. The results also show that effects of the fluid electric conductivity and non-uniform heat generation in a micropolar fluid are less pronounced than that in a Newtonian fluid. Full Text Link: https://doi.org/10.1016/j.ijthermalsci.2009.05.003
EFFICACY OF HERBICIDES PANIDA 33 EC (PENDIMETHALIN) AND NEON 70 WG (METRIBUZIN) IN POTATO FIELDS
(Sher-e-Bangla Agricultural University Research System (SAURES), Dhaka, Bangladesh, 2009-01) Islam, M. K.; Saha, M. K.; Mondal, M. A. A.; Rahman, M. M.; Sarker, M. A. I.
A field experiment was conducted at On-farm research station, Rangpur, BAR I during rabi season of 2005-06 and 2006-07 to find out the optimum rate of herbicides and time of application against weeds in potato fields. Herbicides Panida 33 EC (pendimethalin) and Neon 70 WG (metribuzin) were evaluated through post planting pre-emergence and post emergence (9 days after planting) spraying with different rates on weed management in potato fields. Post planting post emergence spraying of Panida 33 ECC and Neon 70 WP controlled all broad leaf weeds. Among the different rates of herbicides Panida 33 EC @ 10 up to 3.0 liter and Neon 70 WG @ 750 up to 1000g ha showed similar results in controlling broad leaf weeds particularly of Chenopodium album (Bathua), Amaranthus viridis (Shaknotey), Alternanthern philoxeroides (Maloncho). Lindernia anagallis (Panigas), Gnaphulium affine (Bonocopy), Om/is europea (Amrul) and Glil/IIS lotoides (Carpet agacha). Yield of potato tubers in the year 2005-06 was significantly increased up to 51 and 49 % over control by spraying Panida 33 EC @ 3.0 liter and Neon 70 WG @ 1000 g ha", respectively at 9 DAP. Similar result was also observed by spraying Panida 33 EC @ 1.0 liter and Neon 70 WG @ 750 g ha'. In the year 2005-06. the highest tuber yield (21.24 t ha") was recorded from weed free plot which was statistically similar with post emergence Panida 33 EC @ I I ha (19.00 t ha") and post emergence neon 70 WG @ 750 g ha (20.16 t ha'). Similar trend was also observed in next year. Post planting post emergence (9 DAP) spraying of Panida 33 EC @ 1.0 I ha and Neon 70 EC @ 750 g ha in potato fields are most effective in controlling broad leaf weeds like Chenopodium album, Amaranthus viridis, Alternanthera philoxeroides. Gnaphalum affine. Oxalis europca and Glinus lotoides.
ESTIMATE OF HETEROSIS IN BITTER GOURD
(Sher-e-Bangla Agricultural University Research System (SAURES), Dhaka, Bangladesh, 2010-07) Talukder, M. B.; Rahman, M. M.; Islam, M. K.; Rahman, K. A. M. M.; Hosen, M. A.
Heterotic performance of biller gourd hybrids was studied in a set of 5 x 5 diallel cross excluding reciprocals. Analysis of variance indicated highly significant differences for all the characters suggesting the presence of genetic variability among the studied materials. The degree of heterosis was higher for days to first male flower opening, days to first female flower opening, nodes to first female flower. days to first harvest, fruit length, seeds per fruit, branches per vine, fruits per plant and while relatively lower for remaining traits. The hybrids 1', x P, 1', x 1', and 1', x 1', performed earlier compared to mid and better parents. Hybrids PI x P" P, x P" 1', x P, manifested the higher heterosis over mid parent and better parent for fruits per plant while 1', x 1'" PI x 1', for fruit weight. The highest significant positive mid parent heterosis for yield per plant was obtained from the cross 1'2 x 1', (1130 I percent) followed by 1', x P, (78.65 percent), P, x P, (59.30 percent) and PI x P, (50.59 percent) while the highest positive better parent heterosis was obtained for yield per plant in P, x 1', (9425 percent) followed by P, x 1', (4920 percent).
Finite element computational procedure for convective flow of nanofluids in an annulus
(Elsevier, 2018-06) Uddin, Md. Jashim; Rahman, M. M.
In the present study, the detailed procedures of Galerkin weighted residual technique of finite element method (FEM) for solving two-dimensional incompressible natural convective flow of nanofluids using nonhomogeneous dynamic model are discussed for the first time. The physical domain is discretized by using unstructured triangular elements. The governing partial differential equations of nanofluids are made dimensionless using the suitable transformation of variables for weak formulations. The method of weighted residuals is used for obtaining the approximate solutions. This approach typically leads to a sparse and indefinite matrix that is difficult to solve efficiently. The formation of an indefinite matrix is avoided in the present work by introducing an artificial compressibility term in the continuity equation. Unequal order interpolation functions are used for pressure, velocity, temperature and concentration variables. The coefficient matrices are calculated using interpolation functions. Assembling of triangular elements in the discretized domain is discussed elaborately. The process of calculating boundary integrals is also discussed. The Newton-Raphson iteration technique along with Euler-backward scheme is used to solve the global matrix. The sample results are obtained for the convective flow of nanofluids in a concentric annulus. It shows that the annulus of having higher thickness is the best performer enhancing convective heat transfer rates.
Fundamentals of nanofluids: evolution, applications and new theory
(Elsevier, 2016) Uddin, Md. Jashim; Kalbani, Khamis S. Al; Rahman, M. M.; Alam, M. S.; Al-Salti, N.; Eltayeb, Ibrahim
In the past decade, quick developments in nanotechnology have created quite a lot of prospect for the scientists and engineers to check up. Nanofluid is one of the amazing consequences of such progression. Nanofluids are engineered by suspending nanoparticles with average sizes below 100 nm in traditional heat transfer fluids such as water, oil, and ethylene glycol etc. Nanofluids are considered to offer important advantages over conventional heat transfer fluids. A very small amount of guestnanoparticles, when dispersed uniformly and suspended stably in base fluids, canprovide dramatic improvements in the thermal properties of host fluids. Stable and highly conductive nanofluids are produced by generally, one-step and two-step production methods. Both approaches to creating nanoparticle suspensions suffer from agglomeration of nanoparticles, which is a key issue in all technology involving nanopowders. In trying to understand the unexpected discoveries and so to overcome the limitations of classical models, a number of investigators have proposed new physical concepts, mechanisms, and developed new models for enhancing the transport properties. In the present work, wide-ranging fundamental evolution of nanofluids have been discoursed thoroughly by sketching out a gargantuan depiction of the diminutive biosphere of nanofluids through a brief review of some chronological foremost milestone such as the concepts of nanofluids, the preparations and performances of nanofluids, conductivity, viscosity and density correlations of nanofluids, and potential applications and benefits of nanofluids. Also, different kinds of modeling and very important slip mechanisms of constructing heat transfer modeling of nanofluids have been discussed comprehensively in this study. Furthermore, we have established new mathematical equations theoretically for electrical conductivity and thermophoretic velocity in nanofluids as well as nanoparticles mass flux equation due to Brownian diffusion and thermal diffusion which can be used for general transport nanofluids modeling. Our results of thermal diffusion coefficient are also justified by the experimental findings.
GENETIC DIVERGENCE IN Corchorus capsularis L
(Sher-e-Bangla Agricultural University Research System (SAURES), Dhaka, Bangladesh, 2009-07) Yahiya, A. S. M.; Bhuiyan, M. S. R.; Islam, M. M.; Al-Mamun, M.; Rahman, M. M.
Forty two white jute genotypes were analyzed through principal component analysis. principal coordinate analysis, canonical variate analysis and non-hierarchical clustering to identify suitable parents having distant relationship for hybridization programme. The genotypes were grouped into six different clusters. Cluster V had the maximum of eleven genotypes while cluster II had the minimum of three genotypes. The highest inter-genotypic distance was found between G36 and G39 and the lowest distance between G4 and G23.The highest inter-cluster distance was observed between clusters I and II, and the lowest inter-cluster distance was observed between clusters I and VI. The highest intra-cluster distance was found in cluster I and the lowest in cluster II. Cluster with large distances were considered more diverged than those with small distances. Genotypes of cluster II had the highest mean values for base diameter, middle diameter, top diameter, core diameter, dry fibre weight and dry stick weight and that of cluster V had the highest mean values for technical height. leaf angle, leaf length and petiole length. Yield and yield contributing characters such as technical height, base diameter. dry fibre weight and dry stick weight contributed more towards genetic divergence considering diversity pattern. Based on inter cluster distances and desirable characters the genotypes G36 and G33 from cluster I: G28 and G35 from cluster II: G7. G39 and G41 from cluster IV; G3 from cluster VI have been selected for hybridization programme.
GENETIC PARAMETER, CHARACTER ASSOCIATION AND PATH COEFFICIENT ANALYSIS OF SOME EXOTIC GERMPLASM OF TOSSA JUTE (Corchorus olitorius L.)
(Sher-e-Bangla Agricultural University Research System (SAURES), Dhaka, Bangladesh, 2009-07) Rahman, M. M.; Ali, M. A.; Bhuiyan, M. S. R.
Thiny exotic genotypes of tossa jute (Corrhorus olitorious L.) from different geographic origins were evaluated in order to find out their genetic variability. correlation and path coefficient for <) morphological characters. Significant variation was observed among the tested genotypes for different traits except base diameter. High Genotypic Coefficient of Variation (GCV) was observed for fibre weight. stick weight. green weight without leaves and green weight with leaves. High heritability values with high genetic advance in percentage of mean were obtained for green weight without leaves. green weight with leaves. stick weight and fibre weight. Highly significant and positive correlations were observed among the characters- plant height. node number. green weight with leaves. green weight without leaves and stick weight at both genotypic and phenotypic level. Fibre yield was significantly and positively correlated with green weight with leaves. green weight without leaves and stick weight at both levels. Path coefficient analysis indicated maximum direct contribution of stick weight per plant towards fibre yield followed hy green weight without leaves. base diameter and leaf area.
GENETIC VARIABILITY, CORRELATION AND PATH ANALYSIS IN TOSSA JUTE (Corchorus olitorius L.) GERMPLASM
(Sher-e-Bangla Agricultural University Research System (SAURES), Dhaka, Bangladesh, 2008-07) Islam, M. M.; Ali, N. M.; Bhuiyan, M.. S. R.; Rahman, M. M.; Yahiya, A. S. M.
Genetic variability, correlation and path coefficient analysis for yield and yield attributing traits in 41 indigenous genotypes and three commercially cultivated varieties of tossa jute were studied at the Central .lute Agricultural Experiment Station, Manikganj of Bangladesh Jute Research Institute (B.1RI) during April to September 2007. Considering genetic parameters, high genotypic coefficient of variation and high heritability coupled with high genetic advance over mean were recorded for the characters- number of nodes per plant, green weight with leaves per plant, green weight without leaves per plant, stick weight per plant and fibre weight per plant suggesting better opportunity for selecting high valued genotypes based on these characters. Fibre yield per plant was significantly and positively correlated with green weight without leaves per plant and stick weight per plant at both genotypic and phenotypic levels. Path coefficient analysis indicated maximum direct contribution of stick weight per plant towards fibre yield followed by internode length, green weight without leaves per plant, plant height and green weight with leaves per plant.