A compact bandpass filter using microstrip hairpin resonator for WLAN applications

This work represents a microstrip hairpin resonator-based bandpass filter for Wireless Local Area Network (WLAN). Two short-circuited microstrip comb-lines have been coupled at the two sides of a rectangular-loop to construct the hairpin resonator. The Taconic TLX-8 material has been used as the substrate to design the filter at a center frequency of 2.45 GHz. The designed filter exhibits a two-pole Chebyshev response with an insertion loss of -0.37 dB and a minimum return loss of -34.03 dB. This compact filter has a fractional bandwidth of 4.37% which sharply selects the entire bandwidth of WLAN frequencies

A wideband millimeter-wave printable antenna on flexible substrate for breast cancer imaging

Breast cancer is the most diagnosed cancer among women all over the world after skin cancer. Meanwhile, electromagnetic imaging has been a prominent detection technique for biomedical diagnosis in recent years. However, the electromagnetic imaging is struggling with the spatial resolution that can be solved by an imaging technique based on the antenna with a wide operating bandwidth at the higher frequency range. In this paper, a printable Coplanar Waveguide (CPW)-fed microstrip rectangular patch antenna with a wide – 10 dB bandwidth of 18.7 GHz has been proposed for a breast cancer imaging application. This printable antenna, after being designed on a flexible substrate and simulated, operates from 21 GHz to 39.7 GHz which covers the millimeter-wave frequencies. The antenna has achieved an average gain of 4 dBi with an average radiation efficiency of over 80% for the entire -10 dB bandwidth. The bidirectional radiation pattern of the antenna offers the freedom of placing the antenna both at the front and back position on the body surface. Moreover, a compact area of 5×5 mm2 makes the antenna suitable for the biomedical imaging application at mm-wave frequencies by utilizing a low-cost manufacturing process

Comparison of IPM packages on flower thrips and pod borers management of mungbean with recommended practice

Effectiveness of integrated management approaches using blue sticky trap, pheromone trap, bio and synthetic insecticides were evaluated against major insects, like flower thrips and pod borers of mungbean at Regional Agricultural Research Station, Rahmatpur, Barishal and Pulses Research Centre, Ishurdi,Pabna, Bangladesh, respectively, during two consecutive years of 2018 and 2019. All of the management packages significantly reduced flower infestation, thrips population and pod borer infestation in mungbean. The highest percentage of reduction of flower infestation, thrips population and pod borer infestation was found in IPM package-3: installing blue sticky trap + two spraying of chlorfenapyr (Intrepid 10 EC) @ 1 ml/l + third spraying with (chlorantraniliprole + thiamethoxam), i.e. Virtako 40 WG) @ 0.15 g/l, followed by IPM package-1, IPM package-2 and recommended practice (spraying imidacloprid, i.e. Imitaf 20 SL @ 0.5 ml/l). The highest yield was also recorded from IPM package-3, which was statistically similar to IPM package-1, followed by IPM package-2 and recommended practice. Although the IPM package-3 provided the highest yield and return, followed by IPM package-1, but recommended practice (farmer’s practice) gave the highest benefit because of higher cost of IPM components brought down the profit margin of IPM packages. The components of IPM package-1, i.e. biopesticides, are ecologically safer than that of IPM package-3 (synthetic chemical insecticides). So, considering environment friendliness, the IPM package-1: installation of blue sticky trap and pheromone trap + two spraying of azadiractin (Biomeem plus 1EC) @ 1 ml/l + third spraying with spinosad (Success 2.5 EC) @ 1.2 ml/l would be the best package for controlling flower thrips and pod borers of mungbean with higher yield in the insects prone areas, without harming the ecosystem

LARGE-SCALE IFRS IMPLEMENTATION AND BANK PERFORMANCE: AN EMERGING ECONOMY PERSPECTIVE

International Financial Reporting Standards (IFRS) are largely contributing to accounting quality improvement around the world. Since its first mandate in European countries, over 100 countries are now complying with the IFRS in their financial reporting practices. To date, plenty of research initiatives have been undertaken to examine the diverse impacts of IFRS from different perspectives. However, there remains a paucity in examining the changes in firm performance resulting from IFRS adoption, especially in the banking sector. Therefore, this study aims to evaluate the impact of IFRS adoption on financial performances of commercial banks. Compiling panel data of 13 commercial banks listed in Dhaka Stock Exchange, an Ordinary Least Square (OLS) estimate has been administered. The empirical result of the study shows a strong relationship between the large-scale IFRS implementation and commercial banks’ financial performance. The findings of the study contribute to the IFRS literature by exposing the relationship between large scale IFRS implementation and bank performance from an emerging economy perspective. The study also recommends required country-specific strategic considerations in adopting and implementing IFRSs

LARGE-SCALE IFRS IMPLEMENTATION AND BANK PERFORMANCE: AN EMERGING ECONOMY PERSPECTIVE

International Financial Reporting Standards (IFRS) are largely contributing to accounting quality improvement around the world. Since its first mandate in European countries, over 100 countries are now complying with the IFRS in their financial reporting practices. To date, plenty of research initiatives have been undertaken to examine the diverse impacts of IFRS from different perspectives. However, there remains a paucity in examining the changes in firm performance resulting from IFRS adoption, especially in the banking sector. Therefore, this study aims to evaluate the impact of IFRS adoption on financial performances of commercial banks. Compiling panel data of 13 commercial banks listed in Dhaka Stock Exchange, an Ordinary Least Square (OLS) estimate has been administered. The empirical result of the study shows a strong relationship between the large-scale IFRS implementation and commercial banks’ financial performance. The findings of the study contribute to the IFRS literature by exposing the relationship between large scale IFRS implementation and bank performance from an emerging economy perspective. The study also recommends required country-specific strategic considerations in adopting and implementing IFRSs

The effect of processing treatments on the shelf life and nutritional quality of green chilli (Capsicum annuum L.) powder

An attempt was undertaken to investigate the effect of various common processing treatments, such as (a) without pedicle and cut longitudinally plus treated with 0.01% potassium metabisulphite (KMS), (b) without pedicle and sliced, (c) without pedicle as a whole, and (d) as a normal whole green chilli with pedicle, on the shelf life during storage in high density polyethylene (HDPE) and low density polyethylene (LDPE) packages at room temperature. The nutritional quality in terms of proximate compositions, Vitamin-C, beta-carotene and mineral contents of green chilli powder were also assessed. The chilli powder from the treatment (a) showed the highest stability up to 195 days in the HDPE pouches. In relation to proximate compositions and mineral contents, the processing treatments had a significant effect on them, except for Vitamin-C content at P<.0001. The results showed that the nutritional quality in all the samples of green chilli powder was better than that of the red chilli powder. Vitamin C content was reduced around 50% in all the samples due to the processing, while beta-carotene content was significantly increased as compared to the fresh green chilli. A simple calculation revealed the potential of green chilli powder as a value added and alternative spice

Monopole Antenna On Transparent Substrate And Rectifier For Energy Harvesting Applications In 5G

In line with the harvested energy required for the emerging 5G technology, this article proposes a planar monopole antenna and a rectifier. The proposed Coplanar Waveguide (CPW)-fed antenna is printable on a transparent Poly-Ethylene Terephthalate (PET) substrate. The antenna has a center frequency at 3.51 GHz within a bandwidth of 307 MHz that covers the pioneer 5G band in Malaysia. The designed omnidirectional antenna exhibits the maximum gain of 1.51 dBi with a total efficiency of 95.17 percent. At the antenna frequency, a rectifier has been designed with the voltage doubler technique on a Rogers RO3003 substrate. Over an input RF power of 0 dBm, the rectifier has a power conversion efficiency around 42 percent. The proposed antenna rejects harmonics at least until 16 GHz frequency that makes it compatible with the rectifier to eliminate an additional bandpass filter or impedance matching network from the energy harvesting system

Microstrip coupled line bandpass filter with radial stubs for narrow-band applications

The necessity of creating channels by utilizing narrow-bands in high frequency regions is a matter of concern for the next generation-oriented wireless communication systems. A microstrip bandpass filter for narrow-band applications has been proposed in this article. Two coupled line filters with tapered line resonators are loaded at the mid-points of two identical pairs of radial stubs. The scalable length of microstrip lines to extend the radial stubs provides over 536 MHz shift of the resonant frequency with a narrow-band at each perturbing step. The proposed filter has been designed on Taconic TLX-8 substrate with 0.5 mm thickness and its filtering parts occupy a nominal area of 131.09 mm2 without feedlines. The fabricated filter exhibits nearly a 50 MHz pass-band at 6.428 GHz center frequency according to the measurement. Steep response of this filter entirely attenuates the out-band signal which enables it to be suitable for narrow-band applications in the higher frequency regions of C-band and ultra-wideband

Association of serum alpha-1 antitrypsin level with the severity of COPD

Background: Alpha-1 antitrypsin deficiency (AATD) is a hereditary disorder linked to early onset COPD, notably the emphysema variety, but often goes undetected. Low serum AAT levels may impact lung function and correlate with COPD severity. The aim of the study was to detect possible associations of serum AAT level with the severity of COPD patients on the basis of post bronchodilator FEV1 in Bangabandhu Sheikh Mujib Medical University (BSMMU). Methods: A cross-sectional study was conducted at the Department of Respiratory Medicine, BSMMU, Dhaka, from October 2022 to September 2023. Adult patients (≥18 years) of both genders diagnosed with COPD based on spirometry were included. COPD was defined per GOLD guidelines, with a post-bronchodilator FEV1/FVC ratio &lt;70%. Severity was categorized based on post-bronchodilator FEV1% predicted. Association between serum AAT level and COPD severity was analyzed using SPSS version 26, with significance set at p &lt;0.05. Results: The study involved 80 COPD patients, with 1.25% showing low serum AAT levels and 98.75% normal. No significant differences in age, sex, or smoking status were observed among severity groups. Mean serum AAT levels varied across severity groups but were not statistically significant (p=0.377). Smoking was prevalent (66.3%), with common comorbidities like hypertension (26.3%), IHD (16.3%), and diabetes mellitus (15.0%). Shortness of breath (95.0%) and cough (92.5%) were common symptoms, with most patients having moderate disease severity (42.5%). Conclusions: The study indicates a weak association between serum AAT levels and COPD severity, with only 1.25% of 80 patients exhibiting low AAT levels

A Planar Antenna On Flexible Substrate For Future 5G Energy Harvesting In Malaysia

This article presents a planar monopole antenna on flexible substrate for middle band 5G (3.5 GHz) application in Malaysia. The antenna has been designed and optimized for its gain and efficiency with an improved performance in contrast of flexible substrate-based other antennas. The antenna resonates at 3.53 GHz and it has a -10dB bandwidth of 545 MHz. The bending effects of this antenna on the S-parameter and gain have also been investigated. The antenna is able to suppress all the other frequency bands until 20 GHz. The designed antenna has been utilized with a newly designed rectifier to act as an rectenna at 3.5 GHz for RF energy harvesting applications. A reasonable amount of DC output voltage of 930 mV, and a Power Conversion Efficiency of 43.5% have been obtained while 0 dBm RF input power is delivered to the rectifier input terminal. Apart from the utilization as an energy harvester being connected with the proposed rectifier, the designed antenna on flexible substrate can also be employed to biomedical and sensor applications