The 5G network requires higher frequency bands as the Sub-6 GHz to handle vast amounts of data and provide larger bandwidth. This study proposes a novel open-ended wrench-shaped patch antenna with small dimensions 24 × 32 1.6 mm3 achieve wideband operation in range. is etched onto an FR-4 substrate has mm height, loss tangent 0.025, relative permittivity 4.3. intended excited by 50 Ω microstrip line, simulation performed using CST software. impedance matching bandwidth are improved...

The popularity of social media has been increasing tremendously in recent times and thus cyberbullying towards people also increased at an alarming rate. Many texts can be found the comment sections many well-known Bangladeshi personalities YouTube videos. It potential to cause severe emotional psychological distress. Therefore, containing should detected earliest stage prevented from being displayed. In this study, we use natural language processing (NLP) techniques various machine learning...

Cyberbullying includes the repeated and intentional use of digital technology to target another person with threats, harassment, or public humiliation. One techniques is sharing bullying memes on social media, which has increased enormously in recent years. Memes are images texts overlapped sometimes together they present concepts that become dubious if one them absent. Here, we propose a unified deep neural model for detecting media. In proposed architecture, VGG16-BiLSTM, consists VGG16...

Coronavirus disease 2019 (COVID-19) has made a huge pandemic situation in many countries of the world including Bangladesh. If increase rate this threat can be forecasted, immediate measures taken. This study is an effort to forecast present using machine learning (ML) forecasting models. Forecasting was done three categories next 30 days range. In our study, multiple linear regression performed best among other algorithms all with R2 score 99% for first two and 94% third category. Ridge...

Abstract By superposing a chopped below‐gap excitation (BGE) light on cw above‐gap and observing the intensity change of photoluminescence (PL) due to BGE, we clarified distribution nonradiative recombination (NRR) centers in AlGaN multi‐quantum well (MQW) structures for wavelength region deep ultraviolet (UV). The decrease band‐edge PL peak at 10 K exemplified presence pair NRR layers whose transition energy corresponds that BGE. BGE power dependence normalized showed quenching saturation...

Globalization is certainly a blessing for us. Still, this term also brought such things that are constantly not only creating social insecurities but diminishing our mental health, and one of them Cyberbullying. Cyberbullying misuse technology encourages harassment among people. Research on detection has gained increasing attention nowadays in many languages, including Bengali. However, the amount work Bengali language compared to others insignificant. Here we introduce Hybrid ensemble...

Abstract We have succeeded in detecting nonradiative recombination (NRR) centers InAlGaN multiple quantum wells (MQWs) for the sterilization wavelength at around 265 nm by our scheme of two‐wavelength excited photoluminescence (PL). Samples studied are well structures with electron blocking layer grown on sapphire (0001) substrates metal‐organic chemical vapor deposition (MOCVD) technique growth temperature 880 °C (sample A) and 920 B). The MQW consists three 2 sandwiched 7 barrier layers....

An investigation of two-wavelength excited photoluminescence on GaPN alloys containing 0.56% nitrogen was conducted to directly excite intermediate band (IB) states and monitor its impact (PL) properties. The 22 K PL due above-gap excitation (AGE) showed broad peak emission induced by the IB states. With use below-gap (BGE) 1.17 eV energy in addition AGE, intensity found decrease linearly with increasing BGE power, which suggests that perturbs bound exciton recombination mechanism exciting...

An online product's rating is an essential metric to understand the acceptability of that product users. Shoppers use measure quality and excellence product. It helps shopper decide buy a or not. also producer further modification during reproduction. Sometimes people give text review buying products but apathy towards giving number rating, commonly star rating. But producers need know for analysis their business. Producers can this business drive better revenue We have used some supervised...

Harassment is a kind of act that annoys or upsets someone. can be classified into different categories. Sexual harassment one them. type involves the use implicit explicit sexual overtones, including inappropriate and unwelcome promises rewards in exchange for favors. At present time, technology has become more advance spread all over place. That gave toxic people huge opportunity to toxicity online platforms. Because increasing amount Bangla text social media platforms, we also need filter...

Abstract The nonradiative recombination processes in undoped InGaN single quantum well (SQW) grown by MOCVD method have been studied time‐resolved and two‐wavelength excited photoluminescence. External efficiency carrier lifetime decreases with increasing the excitation density which can be explained an enhanced rate. A dominant center optical activation energy of around 1.17 eV has detected inside and/or hetero‐interface SQW, might important clue for determining their origin eliminating...

Synthetic colorants may have adverse health effects, therefore, it is necessary to ensure controlled use of these in various alimentary products. In this study, 54 samples six brands orange jellies were analyzed for the determination ‘Sunset Yellow’ color by High Performance Liquid Chromatography. The results showed that value Sunset Yellow one brand jelly exceeded Bangladesh Standard and Testing Institute (BSTI) value, values four other within range BSTI was absent last one. One yielded...

Beryllium/silicon pair δ-doped GaAs structures grown by molecular-beam epitaxy exhibit a Hall resistance which has nonlinear dependence on the applied magnetic field and is strongly correlated to negative magnetoresistance observed under parallel layers. Dependence of occurrence growth condition investigated. A significantly large increase in both magnitude nonlinearity from samples whose buffer layers are low As∕Ga flux ratio. Reflection high energy electron diffraction microscope...

Magneto-transport properties of Si- and Be-doped GaAs layers grown by molecular-beam epitaxy at low temperatures were studied in order to observe effects electron–electron interactions enhanced doping high concentrations donor acceptor impurities. The negative magneto-resistance was observed from n-type samples the whole measured temperature range up room temperature. Magneto-conductance curves above 150 K are close accord with calculations based on localization theory, while those below...

This paper presents the design of a hexagonal slotted circular flexible textile microstrip patch antenna that is used for C-band satellite communication applications. In proposed design, material blue Jeans fabric with relative permittivity 1.67, loss tangent 0.01 and thickness 1 mm as substrate an overall dimension 40×38 mm2. The it washable, wearable, very economical. Self-adhesive Copper tape to make ground fed through inset feed line. contains hexagonal-shaped slot on partial...

When someone threatens or humiliates another person online by sending those unpleasant messages comments, this is known as Cyberbullying. Recently, Bangla text has been used much more often on social media. People communicate with others media through and comments. So bullies use a rich environment to bully others, especially political issues. Fights over Cyberbullying posts are common today. Most of the time, it does lot damage. However, few works have done for monitoring & no work yet...

The Internet of Things (IoT) era is driving up demand for wireless connectivity, changing the tech sector. creation a compact, inexpensive, and effective antenna crucial supporting IoT devices. In this study, hybrid strategy (HS)-based dense rectangular patch future applications demonstrated. A slotted partial ground with defected structure (DGS) are combined to create HS, leading in small large impedance bandwidth, good matching, increased radiation efficiency, high gain. designed on an...

Gallium arsenide layers doped with high concentrations of Be and Si by molecular-beam epitaxy are studied photoluminescence (PL) spectroscopy. PL peaks from observed at energies significantly lower than the band-gap GaAs. The growth doping conditions suggest that origin these is different low energy peaks, which were in earlier studies attributed to impurity-vacancy complexes. dependence peak on temperature annealing found differ On basis observations, it suggested short range ordered...