80 research outputs found
<b>Supplemental Material - High qualityfactor double negative metamaterial for textile fabric and fabric moisture sensing applications</b>
No full textSupplemental Material for High quality factor double negative metamaterial for textile fabric and fabric moisture sensing applications by Md. Bakey Billa, Mohammad Tariqul Islam, Touhidul Alam, Saleh Albadran, Ahmed Alzamil, Ahmed S. Alshammari, Haitham Alsaif, Md Shabiul Islam and Mohamed S. Soliman in Journal of Industrial Textiles.</p
SCREENING OF ALLELOPATHIC POTENTIAL BANGLADESH WHEAT (Triticum aestivum L.) VARIETIES
Get PDFA Thesis
Submitted to the Department of Agronomy, Faculty of Agriculture,
Sher-e-Bangla Agricultural University, Dhaka in partial
fulfillment of the requirement for the degree of
MASTER OF SCIENCE (MS)
IN
AGRONOMYA series of experiments were carried out in the laboratory and agronomy field of the
Sher-e-Bangla Agricultural University, Dhaka, Bangladesh, from September 2018 to
March 2019 to screen out the allelopathic potential Bangladesh wheat varieties
(Triticum aestivum L.). The experimental design in laboratory bioassay was a
completely randomized design (CRD) with four replications and a randomized
complete block design (RCBD) with three replications in the field experiment.
Initially, the donor-receiver bioassay method was used to assess allelopathic potential
varieties in laboratory (in-vitro) conditions. Raphanus sativus (radish) and Lactuca
sativa (lettuce) as model receiver plants, Chenopodium album (common lambs’
quarter), and Amaranthus viridis (pigweed) as test receiver weeds were used for the
screening test. BARI Gom 21 gave the highest inhibition effect (81%) on C. album
root while the stimulating effect was given by BARI Gom 30 (-48.2%) on R. sativus
root. BARI Gom 21 also reduced the speed of germination against R. sativus, L.
sativa, C. album, and A. viridis (5.35, 4, 4.32 and 5.83 respectively) as well as the
coefficient of the velocity of germination of A. viridis was 1.92. Eleven wheat
varieties were selected including allelopathic and non-allelopathic from the laboratory
test for the field study which was raised by following no weed control method. The
growth pattern of infesting major weeds concerning wheat grown for grain in wheat
fields was also observed. There were different weed species under nine different flora
families viz., Cynodon dactylon, Eleusine indica, Echinochloa colona, Cyperus
rotundus, C. album, A. viridis, A. spinosus, Heliotropium indicum, Alternanthera
philoxeroides, Corchorus acutangulus, Vicia sativa, Solanum caroliensis, S. torvum,
Lindernia procumbens, etc. which infested experimental plots. BARI Gom 21 raised
plots had the lowest infestation and the lowest dry matter of weeds (12 g) resulting in
maximum weed control efficiency (87%). In addition, several weed species including
C. album and A. viridis were not grown in the BARI Gom 21 variety raised plots. The
strong allelopathic inhibition of this variety on the seed germination and seedling
growth of wheat may be the important reason for these weeds' repulsion in the wheat
field. BARI Gom 21 reduced the weed density (14.66 m
-2
, 28.33 m
-2
and 33.33 m
at
15, 25 and 35 DAS respectively). The Simpson Diversity Index (SDI) was calculated
against different varieties, and the highest in BARI Gom 21 (0.82) and the lowest in
BARI Gom 22 (0.68). There found a positive correlation (R
2
= 0.386) between SDI
and the root inhibition percentage of laboratory bioassay. Therefore, BARI Gom 21
wheat variety was selected as the most allelopathic among the tested Bangladesh
wheat variety. This wheat variety could be used for the isolation and identification of
allelochemicals and to develop by breeding and adopting other agronomic practices
for obtaining optimum yield performance and tolerance to weeds, and in particular, to
achieve improved biological weed control for the sustainable production of wheat
HOUSEHOLDS’ WILLINGNESS TO PAY FOR IMPROVED DRINKING WATER- A CASE STUDY ON KHULNA CITY CORPORATION USING DISCRETE CHOICE MODEL
Get PDFThe purpose of the study is to find out the willingness to pay for improved drinking water services using Discrete Choice Model (DCM). To carry out the study, concept profiling has been done and data have been collected randomly from 120 households from two areas, Basupara and Najirghat of Ward-26 of KCC. Multinomial Logit Model (MLM) has been taken to into consideration to see relative willingness to pay (WTP) for accessing improved drinking water services being in status quo position. The study explores that, people who have the willingness to pay BDT 450 are 9.67 times higher than the willingness to pay BDT 250. On the other hand, people who have the willingness to pay BDT 600 are about 2.38 times more likely to choose Alternative-2 option than those who have the willingness to pay BDT 250. 
Drivers and temporality of internal migration in the context of slow-onset natural hazards: Insights from north-west rural Bangladesh
Get PDFThis paper examines the association between slow-onset natural hazards and the temporal aspects of human mobility— that is, short-term and long-term internal migration in the context of north-west Bangladesh. The paper contributes to the current understanding on the multiple stressors influencing individual's decisions to migrate from their rural origin, while examining the interplay between factors such as tipping points of migration (identified as drivers of migration), socio-demographic variables, and the contexts of slow-onset natural hazards. The analysis is based on empirical data relating to disadvantaged internal migrants or their household members living in drought-prone and riverine areas. A binary logistic regression model is used to analyse how various factors influence the temporality of migration. Key findings indicate that in the context of the natural hazards studied, financial stress at the household level and lack of economic resources are strongly associated with people's decisions to migrate for the-long or short-term. Based on such findings, the paper argues for diversified policy interventions for different groups of internal migrants in order to address difficulties associated with their mobility to and settlement at new locations
Estimating Recreational Value of Foy's Lake: An Application of Travel Cost Count Data Model for Truncated Zeros
No full textTo estimate the recreational value provided by the Foy&rsquo;s Lake annually using the most applicable model for on-site data is the main objective of this study. Adhere to the objective of this study; Individual Travel Cost Method (ITCM) has been applied and Zero Truncated Poisson Regression Model has been found plausible among other models to estimate consumer surplus. Based on the findings of the study, an estimate of the consumer surplus or recreational benefits per trip per visitor can be recommended as BDT 5,875 or US 40.2 million.</jats:p
GROWING POPULARITY OF MAIZE CULTIVATION IN RANGPUR DISTRICT OF BANGLADESH: AN EVIDENCE FROM GANGACHARA UPAZILA
Get PDFMaize cultivation has been gaining popularly in the rangpur district of Bangladesh in recent years. The study is mainly an attempt to explore the reasons for the growing popularity of maize cultivation in the Gangachara upazila (Sub-district) of Rangpur district. It also examines the future viability of maize cultivation in this area. For data collection, three-stage cluster sampling method has been used to determine the setting of the study selecting 110 farmers who have been involving themselves in maize cultivation for at least ten years, by replacing traditional crops like tobacco and boro rice. Benefit-cost (ratio) analysis is carried out in the study for its purpose and it is found that the cultivation of maize is more profitable than that of boro rice and tobacco. Furthermore, water table data analysis in the study also reveals that the ground water level is depleting in the study area in rabi season and causing groundwater scarcity. Therefore, it would be viable to cultivate maize in the near future at the backdrop of the scarcity of the ground water as maize is less water-intensive crop than other traditional crops grown in this region
Development Of Microwave Brain Stroke Imaging System Using Multiple Antipodal Vivaldi Antennas Based On Raspberry Pi Technology
Get PDFThis paper proposes a Microwave Imaging System (MIS) for brain stroke detection. In the MIS, the primary challenge is to improve in terms of cost, size, and stroke image quality. Thus, the main contribution of this work is the economy and the compact rotation platform integrated with an array of nine antipodal Vivaldi antenna in circular arrangement and single computer board, Raspberry Pi Module (RPM) as microcontroller developed. The design and fabrication of wideband antenna based on Computer Simulation Technology (CST) software and Rogers RO4350B substrate, which
operated from 2.06 GHz to 2.61 GHz. In the RPM, the Python programming language used for regulating the angle of rotation and antenna switching process. The process of receiving reflection signals from the head phantom for each antenna supervised by Single-Pole 8-Throw (SP8T) Radio Frequency (RF) switch. The fabricated head phantom based on the primary tissues of the brain, white matter using inexpensive materials, and located in the middle of the platform. Platform rotation is a combination of wood-based platform with the size 0.36m2 and material Perspex. Then, through an interfacing process between Python script and Vector Network Analyzer (VNA), the raw data in S-Parameters transferred to the MATLAB software for analysis. The fabricated antenna able to realize high directivity, 86.92% efficiency, and 2.45 dBi gain. Overall, the proposed system offers the cost-effective, compact, and able to collect the data effectively around the head phantom that consist of a target clot and without a target clot at 50 different positions. It successfully tracked the presence of stroke clots through color differences in color plots
Performance analysis of an S‐band antenna for nanosatellite payloads communication system
No full text
Electric-Field-Coupled Resonator Antenna for 5G Applications
No full textIn this paper, a compact wideband patch antenna comprising a modified electric-field-coupled resonator with parasitic elements is presented. The resonance at low frequency is achieved due to the electric field polarization along the split of the conventional LC (inductive-capacitive) structure. However, this antenna gives low bandwidth as well as low gain. Some evolutionary techniques are adopted to get a compact wideband antenna at 3GPP bands of 5G. The split width and the ground plane are modified to achieve enhanced bandwidth with good impedance matching, whereas the addition of the parasitic elements on both sides of the microstrip feed line enhances the gain with a slight reduction of bandwidth. The compact dimension of the proposed antenna is 0.26 λ(L) × 0.26 λ(L) × 0.017 λ(L,) where λ(L) is the free space wavelength at the lowest frequency. A prototype of the presented design is fabricated and measured. Measurement shows that the antenna has an operating bandwidth of 19.74% for |S11| < −10 dB where the gain of 1.15 dBi is realized. In addition, the radiation pattern is omnidirectional in the horizontal plane and dumbbell shaped in the elevation plane. The cross-polarization levels in both planes are less than −12 dB
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