Interdisciplinary Perspectives on Infectious Diseases
With an increasing number of severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) sequenc... more With an increasing number of severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) sequences gathered worldwide, we recognize that deletion mutants and nucleotide substitutions that may affect whole-genome sequencing are accumulating. Here, we propose an additional strategy for tiling PCR for whole-genome resequencing, which can make the pipeline robust for mutations at the primer annealing site by a redundant amplicon scheme. We further demonstrated that subtracting overrepresented amplicons from the multiplex PCR products reduced the bias of the next-generation sequencing (NGS) library, resulting in decreasing required sequencing reads per sample. We applied this sequencing strategy to clinical specimens collected in Bangladesh. More than 80% out of the 304 samples were successfully sequenced. Less than 5% were ambiguous nucleotides, and several known variants were detected. With the additional strategies presented here, we believe that whole-genome resequencing of SARS-CoV...
Personalized trip recommendation attempts to recommend a sequence of Points of Interest (POIs) to... more Personalized trip recommendation attempts to recommend a sequence of Points of Interest (POIs) to a user. Compared with a single POI recommendation, the POIs sequence recommendation is challenging. There are only a couple of studies focusing on POIs sequence recommendations. It is a challenge to generate a reliable sequence of POIs. The two consecutive POIs should not be similar or from the same category. In developing the sequence of POIs, it is necessary to consider the categories of consecutive POIs. The user with no recorded history is also a challenge to address in trip recommendations. Another problem is that recommending the exact and accurate location makes the users bored. Looking at the same kind of POIs, again and again, is sometimes irritating and tedious. To address these issues in recommendation lies in searching for the sequential, relevant, novel, and unexpected (with high satisfaction) Points of Interest (POIs) to plan a personalized trip. To generate sequential POI...
ABSTRACT : The RA ( Research Article) is considered to be the main channel of knowledge productio... more ABSTRACT : The RA ( Research Article) is considered to be the main channel of knowledge production . H owever, for student writers and novice scholars writing , RA is a challenging task. It is partly because of lack of exposure to and awareness of the rhetorical structure of RAs ( Research Article s) in the intended discipline. The objective of this study is to identify the rhetorical moves of RAs in applied linguistics and explaining their communicative functions that can be used for pedagogic purposes for novice scholars in this discipline. Analyses of moves and their constituent steps together with their frequency count would help suggest obligatory and optional moves in the Introduction section. Also a nalysis of move structural patterns , which would enable to draw possible move sequencing is within the purview of this study. A corpus of 20 empirical RAs of leading and representative 4 journals in applied linguistics have been analyzed following J.M. Swales (1990 and 2004) move analysis of Introduction sections of empirical RAs. Results were obtained through software coding of moves of these 20 RAs , and through qualitative analysis of communicative functions of moves and steps. From the frequency count of moves and steps , it is found that some moves and their constituent steps are obligatory , while others are optional. Findings show they both conform to and depart from J.M. Swales ’ CARS ( Create-a-Research-Space) model in 1990 and 2004 . The findings of the study will facilitate better understanding of RAs in applied linguistics for novice scholars and contribute to these scholars’ efforts to publish their research in this field. KEY WORDS: I ntroductions ; R esearch A rticles ; R hetorical S tructure ; M ove A nalysis ; G enre. About the Authors: Mizanur Rahman is a Ph.D. Candidate in English Language Studies at the UKM (National University of Malaysia); and also an Assistant Professor at the Department of Humanities BUET (Bangladesh University of Engineering and Technology) in Dhaka 1000, Bangladesh. Assoc. Prof. Dr. Saadiyah Darus and Assoc. Prof. Dr. Zaini Amir are the Lecturers at the School of Language Studies and Linguistics, Faculty of Social Sciences and Humanities UKM, 43600 UKM Bangi, Selangor, Malaysia. For academic interests, the authors can be contacted via e-mail at: [email protected] How to cite this article? Rahman, Mizanur, Saadiyah Darus & Zaini Amir. (2017). “Rhetorical Structure of Introduction in Applied Linguistics Research Articles” in EDUCARE: International Journal for Educational Studies , Vol.9(2), February, pp.69-84. Bandung, Indonesia: Minda Masagi Press owned by ASPENSI, ISSN 1979-7877. Chronicle of the article: Accepted (September 27, 2016); Revised (January 27, 2017); and Published (February 27, 2017).
An algebraic intermittency function is developed for “laminar-to-turbulent” transition flow withi... more An algebraic intermittency function is developed for “laminar-to-turbulent” transition flow within the framework of Bradshaw stress–intensity factor (ratio of principal shear-stress over turbulent kinetic energy in the boundary layer), which is parameterized with a “flow-structure-adaptive” variable (eddy-to-laminar viscosity ratio). Naturally, the intermittency inherits the “flow-structure-adaptive” character and captures various transition phenomena like bypass, separation-induced, and natural transitions when incorporated in an undamped eddy-viscosity transport equation. An additional viscous-production term is added with the eddy-viscosity transport equation to ensure proper generation of eddy-viscosity at the viscous sublayer when computing separation-induced transition over a low-Reynolds number airfoil. Splitting the intermittency into low and elevated free-stream turbulence intensities has the potential to avoid the “trial-and-error” inconsistency involved in most of the cor...
MIST INTERNATIONAL JOURNAL OF SCIENCE AND TECHNOLOGY, 2021
A new zero-equation model (ZEM) is devised with an eddy-viscosity formulation using a stress leng... more A new zero-equation model (ZEM) is devised with an eddy-viscosity formulation using a stress length variable which the structural ensemble dynamics (SED) theory predicts. The ZEM is distinguished by obvious physical parameters, quantifying the underlying flow domain with a universal multi-layer structure. The SED theory is also utilized to formulate an anisotropic Bradshaw stress-intensity factor, parameterized with an eddy-to-laminar viscosity ratio. Bradshaw’s structure function is employed to evaluate the kinetic energy of turbulence k and turbulent dissipation rate epsilon . The proposed ZEM is intrinsically plausible, having a dramatic impact on the prediction of wall-bounded turbulence.
Influenza is one of the most common respiratory virus infections. We analyzed hemagglutinin (HA) ... more Influenza is one of the most common respiratory virus infections. We analyzed hemagglutinin (HA) and neuraminidase (NA) gene segments of viruses isolated from influenza patients who visited Evercare Hospital Dhaka, Bangladesh, in early 2020 immediately before the coronavirus disease 2019 (COVID-19) pandemic. All of them were influenza virus type A (IAV) H1N1pdm. Sequence analysis of the HA segments of the virus strains isolated from the clinical specimens and the subsequent phylogenic analyses of the obtained sequences revealed that all of the H1N1pdm recent subclades 6B.1A5A + 187V/A, 6B.1A5A + 156K, and 6B.1A5A + 156K with K209M were already present in Bangladesh in January 2020. Molecular clock analysis results suggested that the subclade 6B.1A5A + 156K emerged in Denmark, Australia, or the United States in July 2019, while subclades 6B.1A5A + 187V/A and 6B.1A5A + 156K with K209M emerged in East Asia in April and September 2019, respectively. On the other hand, sequence analysis ...
This is a retrospective observational study aimed to search the alteration of circulating dengue ... more This is a retrospective observational study aimed to search the alteration of circulating dengue virus (DENV) serotypes in Dhaka City for five consecutive years (2017-2021) along with disease outcome. Methods: Routine dengue NS1 or PCR positive dengue samples from patients who visited Evercare Hospital Dhaka (ex. Apollo Hospitals Dhaka) were selected for serotype determination by serotype specific real time reverse transcriptase PCR (RT-PCR). Results: In 2017, predominant serotype was DENV-2 (91.3%) with less than 5% of DENV-1 and DENV-3 among 161 cases. In 2018, among127 cases, DENV-2 was the predominant serotype (40.95%) followed by DENV-3 (33.07%) and DENV-1 (25.98%). In 2019, predominance of DENV-2 was totally replaced by DENV-3 (91.86%) and DENV-1 (8.14%). In 2021, only DENV-3 serotype was detected among 178 samples. Regarding serotype association with disease outcome, more severe cases (Dengue Hemorrhagic Fever/Dengue Shock Syndrome) were observed from 2019 with notable shifti...
Breast cancer is the most commonly occurring cancer in women of Western countries and is the lead... more Breast cancer is the most commonly occurring cancer in women of Western countries and is the leading cause of cancer-related mortality. The breast tumor microenvironment contains immune cells, fibroblasts, adipocytes, mesenchymal stem cells, and extracellular matrix. Among these cells, macrophages or tumor-associated macrophages (TAMs) are the major components of the breast cancer microenvironment. TAMs facilitate metastasis of the breast tumor and are responsible for poor clinical outcomes. High TAM density was also found liable for the poor prognosis of breast cancer. These observations make altering TAM function a potential therapeutic target to treat breast cancer. The present review summarizes the origin of TAMs, mechanisms of macrophage recruitment and polarization in the tumor, and the contributions of TAMs in tumor progression. We have also discussed our current knowledge about TAM-targeted therapies and the roles of miRNAs and exosomes in re-educating TAM function.
Abstaining from a corrector step of SIMPLE-like algorithms, a coupled pressure-based algorithm is... more Abstaining from a corrector step of SIMPLE-like algorithms, a coupled pressure-based algorithm is designed using a cell-centered finite-volume ∆-approximation on a collocated grid to predict all-speed fluid flows. A consistently formulated cell-face dissipation scheme is invoked to unravel the occurrence of pressure-velocity decoupling. Modified Rusanov, Roe and Lax-Wendroff flux-difference schemes accompanied by a newly devised differentiable slope limiter function are used to compute inviscid fluxes over the entire spectrum of subsonic to hypersonic flow. Numerical experiments in reference to incompressible and compressible flows demonstrate that the proposed algorithm maintains an excellent consistency with analytic solutions and available literature data. The method is anticipated to be stable for an extensive range of Mach numbers with an avoidance of under-relaxation (UR) factors. c
The broaching tool is an efficient and precisely heavy-loaded metal-cutting tool, widely used in ... more The broaching tool is an efficient and precisely heavy-loaded metal-cutting tool, widely used in the mass production of key components related to the aerospace and automobile industries. However, the heavy load, intense squeezing, and friction in the tool-chip contact area prevent the cutting fluid from entering the desired location. Consequently, insufficient lubrication gives rise to a high-temperature built-up edge, thereby lowering machining accuracy and efficiency. To reduce frictional force, three textures (i.e., micro-pit, stripe, mesh) are prepared on the rake face of broaching tool with laser processing technique. Afterward, textured grooves are covered with copper using the reciprocating rotational friction; this artifact enhances the system’s wettability and heat dissipation ability. Experiments approve that compared to the non-textured cutting teeth, the cutting force with the stripe-textured teeth is reduced by 7.6%. Nevertheless, the cutting force is decreased by 14.6%...
Internet-of-Things (IoT) based applications are rapidly gaining popularity. Smart home is one of ... more Internet-of-Things (IoT) based applications are rapidly gaining popularity. Smart home is one of them; home security and safety, home automation, energy management and health surveillance are some applications of smart homes. Smart homes have enormous potential as well as enormous threat to security and privacy of the end users. Pay TV is considered asthe likely entry points for IoT services into smart homes. Pay TV has evolved security techniques very similar to of IoT based smart homes services. Pay TV is an application of broadcast encryption schemes in which premium content is broadcasted only to subscribed users. The broadcaster needs assurance that only subscribed user can access premium content, so the program is encrypted with a group key shared among all subscribers. Thus, to share the key, Pay-TV systems require efficient and secure group key agreement (GKA). This research proposes an efficient and secure, dynamic, ID-based authenticated, asymmetric group key agreement (AA...
This paper reports the evaluation of adsorbing Cr (VI) ions on sorbent prepared from chitosan (CH... more This paper reports the evaluation of adsorbing Cr (VI) ions on sorbent prepared from chitosan (CHT), a versatile derivative of chitin, and dodecyl amine modified locally available kaolinite clay (Bijoypur clay) (MC) that has excellent mechanical properties and great resistance to chemical and biological attack. The effect of the initial metal ion concentration, solution pH, contact time, and adsorbent dosages on the adsorption capacity of the composites was investigated. pH 4 is selected for better adsorption by the adsorbents. The adsorption abilities were studied over Cr (VI) ions using different adsorption isotherm such as Langmuir, Freundlich, and Dubinin-Radushkevich respectively. Langmuir isotherm is found better fitted with maximum adsorption capacity of 73 mg/g by composite SB-1. R2 obtained from Langmuir isotherm is 0.999 which indicates a monolayer adsorption on the adsorbent surface. The adsorption kinetics was also well described by the pseudo-second-order equation with ...
A method to stabilize the draft through natural cooling towers is introduced. Natural draught dry... more A method to stabilize the draft through natural cooling towers is introduced. Natural draught dry cooling towers are widely used in arid regions of the world for the power industry especially those employing nuclear reactors. Their presence has become iconic of the process industry for their dominance of the landscape. These towers control the overall efficiency of power plants, and with the ongoing energy crisis it is desirable to raise efficiency by stabilising the draught through the tower. Energy comsumption is a substantial part of the overall cost of plant operation, and therefore even with a conservative 5 per cent improvement is feasible. It has been noted by some researchers like Baer, Ernst and Wurz (1980) that cooling towers do experience unstable flow with breezes. This phenomenon can be explained by JA¶rg and Scorer (1967) to occur even in a still ambience with cold air inflow down into the tower shell from exit. JA¶rg and Scorer (1967) developed a correlation to predic...
Building Resilience at Universities: Role of Innovation and Entrepreneurship, 2021
Rosiglitazone is an effective insulin-sensitizer, however, associated with bone loss mainly due t... more Rosiglitazone is an effective insulin-sensitizer, however, associated with bone loss mainly due to increased bone resorption, and bone marrow adiposity, and decreased bone formation. We investigated the effect of the co-administration of fish oil (FO) rich in omega-3 fatty acids (FAs) on rosiglitazone (RSG)-induced bone loss in aging C57BL/6 mice and the mechanisms underlying potential preventive effect. Mice fed the iso-caloric diet supplemented with fish oil exhibited significantly higher levels of bone density in different regions compared to the other groups. In the same cohort of mice, reduced activity of COX-2, enhanced activity of alkaline phosphatase, lower levels of cathepsin k, PPAR-γ, and pro-inflammatory cytokines, and a higher level of anti-inflammatory cytokines were observed. Moreover, fish oil restored rosiglitazone-induced down-regulation of osteoblast differentiation and up-regulation of adipocyte differentiation in C3H10T1/2 cells and inhibited the up-regulation o...
Photovoltaic (PV) technology is becoming more popular due to climate change because it allows for... more Photovoltaic (PV) technology is becoming more popular due to climate change because it allows for replacing fossil-fuel power generation to reduce greenhouse gas emissions. Consequently, many countries have been attempting to generate electricity through PV power plants over the last decade. Monitoring PV power plants through satellite imagery, machine learning models, and cloud-based computing systems that may ensure rapid and precise locating with current status on a regional basis are crucial for environmental impact assessment and policy formulation. The effect of fusion of the spectral, textural with different neighbor sizes, and topographic features that may improve machine learning accuracy has not been evaluated yet in PV power plants’ mapping. This study mapped PV power plants using a random forest (RF) model on the Google Earth Engine (GEE) platform. We combined textural features calculated from the Grey Level Co-occurrence Matrix (GLCM), reflectance, thermal spectral feat...
Interdisciplinary Perspectives on Infectious Diseases
With an increasing number of severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) sequenc... more With an increasing number of severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) sequences gathered worldwide, we recognize that deletion mutants and nucleotide substitutions that may affect whole-genome sequencing are accumulating. Here, we propose an additional strategy for tiling PCR for whole-genome resequencing, which can make the pipeline robust for mutations at the primer annealing site by a redundant amplicon scheme. We further demonstrated that subtracting overrepresented amplicons from the multiplex PCR products reduced the bias of the next-generation sequencing (NGS) library, resulting in decreasing required sequencing reads per sample. We applied this sequencing strategy to clinical specimens collected in Bangladesh. More than 80% out of the 304 samples were successfully sequenced. Less than 5% were ambiguous nucleotides, and several known variants were detected. With the additional strategies presented here, we believe that whole-genome resequencing of SARS-CoV...
Personalized trip recommendation attempts to recommend a sequence of Points of Interest (POIs) to... more Personalized trip recommendation attempts to recommend a sequence of Points of Interest (POIs) to a user. Compared with a single POI recommendation, the POIs sequence recommendation is challenging. There are only a couple of studies focusing on POIs sequence recommendations. It is a challenge to generate a reliable sequence of POIs. The two consecutive POIs should not be similar or from the same category. In developing the sequence of POIs, it is necessary to consider the categories of consecutive POIs. The user with no recorded history is also a challenge to address in trip recommendations. Another problem is that recommending the exact and accurate location makes the users bored. Looking at the same kind of POIs, again and again, is sometimes irritating and tedious. To address these issues in recommendation lies in searching for the sequential, relevant, novel, and unexpected (with high satisfaction) Points of Interest (POIs) to plan a personalized trip. To generate sequential POI...
ABSTRACT : The RA ( Research Article) is considered to be the main channel of knowledge productio... more ABSTRACT : The RA ( Research Article) is considered to be the main channel of knowledge production . H owever, for student writers and novice scholars writing , RA is a challenging task. It is partly because of lack of exposure to and awareness of the rhetorical structure of RAs ( Research Article s) in the intended discipline. The objective of this study is to identify the rhetorical moves of RAs in applied linguistics and explaining their communicative functions that can be used for pedagogic purposes for novice scholars in this discipline. Analyses of moves and their constituent steps together with their frequency count would help suggest obligatory and optional moves in the Introduction section. Also a nalysis of move structural patterns , which would enable to draw possible move sequencing is within the purview of this study. A corpus of 20 empirical RAs of leading and representative 4 journals in applied linguistics have been analyzed following J.M. Swales (1990 and 2004) move analysis of Introduction sections of empirical RAs. Results were obtained through software coding of moves of these 20 RAs , and through qualitative analysis of communicative functions of moves and steps. From the frequency count of moves and steps , it is found that some moves and their constituent steps are obligatory , while others are optional. Findings show they both conform to and depart from J.M. Swales ’ CARS ( Create-a-Research-Space) model in 1990 and 2004 . The findings of the study will facilitate better understanding of RAs in applied linguistics for novice scholars and contribute to these scholars’ efforts to publish their research in this field. KEY WORDS: I ntroductions ; R esearch A rticles ; R hetorical S tructure ; M ove A nalysis ; G enre. About the Authors: Mizanur Rahman is a Ph.D. Candidate in English Language Studies at the UKM (National University of Malaysia); and also an Assistant Professor at the Department of Humanities BUET (Bangladesh University of Engineering and Technology) in Dhaka 1000, Bangladesh. Assoc. Prof. Dr. Saadiyah Darus and Assoc. Prof. Dr. Zaini Amir are the Lecturers at the School of Language Studies and Linguistics, Faculty of Social Sciences and Humanities UKM, 43600 UKM Bangi, Selangor, Malaysia. For academic interests, the authors can be contacted via e-mail at: [email protected] How to cite this article? Rahman, Mizanur, Saadiyah Darus & Zaini Amir. (2017). “Rhetorical Structure of Introduction in Applied Linguistics Research Articles” in EDUCARE: International Journal for Educational Studies , Vol.9(2), February, pp.69-84. Bandung, Indonesia: Minda Masagi Press owned by ASPENSI, ISSN 1979-7877. Chronicle of the article: Accepted (September 27, 2016); Revised (January 27, 2017); and Published (February 27, 2017).
An algebraic intermittency function is developed for “laminar-to-turbulent” transition flow withi... more An algebraic intermittency function is developed for “laminar-to-turbulent” transition flow within the framework of Bradshaw stress–intensity factor (ratio of principal shear-stress over turbulent kinetic energy in the boundary layer), which is parameterized with a “flow-structure-adaptive” variable (eddy-to-laminar viscosity ratio). Naturally, the intermittency inherits the “flow-structure-adaptive” character and captures various transition phenomena like bypass, separation-induced, and natural transitions when incorporated in an undamped eddy-viscosity transport equation. An additional viscous-production term is added with the eddy-viscosity transport equation to ensure proper generation of eddy-viscosity at the viscous sublayer when computing separation-induced transition over a low-Reynolds number airfoil. Splitting the intermittency into low and elevated free-stream turbulence intensities has the potential to avoid the “trial-and-error” inconsistency involved in most of the cor...
MIST INTERNATIONAL JOURNAL OF SCIENCE AND TECHNOLOGY, 2021
A new zero-equation model (ZEM) is devised with an eddy-viscosity formulation using a stress leng... more A new zero-equation model (ZEM) is devised with an eddy-viscosity formulation using a stress length variable which the structural ensemble dynamics (SED) theory predicts. The ZEM is distinguished by obvious physical parameters, quantifying the underlying flow domain with a universal multi-layer structure. The SED theory is also utilized to formulate an anisotropic Bradshaw stress-intensity factor, parameterized with an eddy-to-laminar viscosity ratio. Bradshaw’s structure function is employed to evaluate the kinetic energy of turbulence k and turbulent dissipation rate epsilon . The proposed ZEM is intrinsically plausible, having a dramatic impact on the prediction of wall-bounded turbulence.
Influenza is one of the most common respiratory virus infections. We analyzed hemagglutinin (HA) ... more Influenza is one of the most common respiratory virus infections. We analyzed hemagglutinin (HA) and neuraminidase (NA) gene segments of viruses isolated from influenza patients who visited Evercare Hospital Dhaka, Bangladesh, in early 2020 immediately before the coronavirus disease 2019 (COVID-19) pandemic. All of them were influenza virus type A (IAV) H1N1pdm. Sequence analysis of the HA segments of the virus strains isolated from the clinical specimens and the subsequent phylogenic analyses of the obtained sequences revealed that all of the H1N1pdm recent subclades 6B.1A5A + 187V/A, 6B.1A5A + 156K, and 6B.1A5A + 156K with K209M were already present in Bangladesh in January 2020. Molecular clock analysis results suggested that the subclade 6B.1A5A + 156K emerged in Denmark, Australia, or the United States in July 2019, while subclades 6B.1A5A + 187V/A and 6B.1A5A + 156K with K209M emerged in East Asia in April and September 2019, respectively. On the other hand, sequence analysis ...
This is a retrospective observational study aimed to search the alteration of circulating dengue ... more This is a retrospective observational study aimed to search the alteration of circulating dengue virus (DENV) serotypes in Dhaka City for five consecutive years (2017-2021) along with disease outcome. Methods: Routine dengue NS1 or PCR positive dengue samples from patients who visited Evercare Hospital Dhaka (ex. Apollo Hospitals Dhaka) were selected for serotype determination by serotype specific real time reverse transcriptase PCR (RT-PCR). Results: In 2017, predominant serotype was DENV-2 (91.3%) with less than 5% of DENV-1 and DENV-3 among 161 cases. In 2018, among127 cases, DENV-2 was the predominant serotype (40.95%) followed by DENV-3 (33.07%) and DENV-1 (25.98%). In 2019, predominance of DENV-2 was totally replaced by DENV-3 (91.86%) and DENV-1 (8.14%). In 2021, only DENV-3 serotype was detected among 178 samples. Regarding serotype association with disease outcome, more severe cases (Dengue Hemorrhagic Fever/Dengue Shock Syndrome) were observed from 2019 with notable shifti...
Breast cancer is the most commonly occurring cancer in women of Western countries and is the lead... more Breast cancer is the most commonly occurring cancer in women of Western countries and is the leading cause of cancer-related mortality. The breast tumor microenvironment contains immune cells, fibroblasts, adipocytes, mesenchymal stem cells, and extracellular matrix. Among these cells, macrophages or tumor-associated macrophages (TAMs) are the major components of the breast cancer microenvironment. TAMs facilitate metastasis of the breast tumor and are responsible for poor clinical outcomes. High TAM density was also found liable for the poor prognosis of breast cancer. These observations make altering TAM function a potential therapeutic target to treat breast cancer. The present review summarizes the origin of TAMs, mechanisms of macrophage recruitment and polarization in the tumor, and the contributions of TAMs in tumor progression. We have also discussed our current knowledge about TAM-targeted therapies and the roles of miRNAs and exosomes in re-educating TAM function.
Abstaining from a corrector step of SIMPLE-like algorithms, a coupled pressure-based algorithm is... more Abstaining from a corrector step of SIMPLE-like algorithms, a coupled pressure-based algorithm is designed using a cell-centered finite-volume ∆-approximation on a collocated grid to predict all-speed fluid flows. A consistently formulated cell-face dissipation scheme is invoked to unravel the occurrence of pressure-velocity decoupling. Modified Rusanov, Roe and Lax-Wendroff flux-difference schemes accompanied by a newly devised differentiable slope limiter function are used to compute inviscid fluxes over the entire spectrum of subsonic to hypersonic flow. Numerical experiments in reference to incompressible and compressible flows demonstrate that the proposed algorithm maintains an excellent consistency with analytic solutions and available literature data. The method is anticipated to be stable for an extensive range of Mach numbers with an avoidance of under-relaxation (UR) factors. c
The broaching tool is an efficient and precisely heavy-loaded metal-cutting tool, widely used in ... more The broaching tool is an efficient and precisely heavy-loaded metal-cutting tool, widely used in the mass production of key components related to the aerospace and automobile industries. However, the heavy load, intense squeezing, and friction in the tool-chip contact area prevent the cutting fluid from entering the desired location. Consequently, insufficient lubrication gives rise to a high-temperature built-up edge, thereby lowering machining accuracy and efficiency. To reduce frictional force, three textures (i.e., micro-pit, stripe, mesh) are prepared on the rake face of broaching tool with laser processing technique. Afterward, textured grooves are covered with copper using the reciprocating rotational friction; this artifact enhances the system’s wettability and heat dissipation ability. Experiments approve that compared to the non-textured cutting teeth, the cutting force with the stripe-textured teeth is reduced by 7.6%. Nevertheless, the cutting force is decreased by 14.6%...
Internet-of-Things (IoT) based applications are rapidly gaining popularity. Smart home is one of ... more Internet-of-Things (IoT) based applications are rapidly gaining popularity. Smart home is one of them; home security and safety, home automation, energy management and health surveillance are some applications of smart homes. Smart homes have enormous potential as well as enormous threat to security and privacy of the end users. Pay TV is considered asthe likely entry points for IoT services into smart homes. Pay TV has evolved security techniques very similar to of IoT based smart homes services. Pay TV is an application of broadcast encryption schemes in which premium content is broadcasted only to subscribed users. The broadcaster needs assurance that only subscribed user can access premium content, so the program is encrypted with a group key shared among all subscribers. Thus, to share the key, Pay-TV systems require efficient and secure group key agreement (GKA). This research proposes an efficient and secure, dynamic, ID-based authenticated, asymmetric group key agreement (AA...
This paper reports the evaluation of adsorbing Cr (VI) ions on sorbent prepared from chitosan (CH... more This paper reports the evaluation of adsorbing Cr (VI) ions on sorbent prepared from chitosan (CHT), a versatile derivative of chitin, and dodecyl amine modified locally available kaolinite clay (Bijoypur clay) (MC) that has excellent mechanical properties and great resistance to chemical and biological attack. The effect of the initial metal ion concentration, solution pH, contact time, and adsorbent dosages on the adsorption capacity of the composites was investigated. pH 4 is selected for better adsorption by the adsorbents. The adsorption abilities were studied over Cr (VI) ions using different adsorption isotherm such as Langmuir, Freundlich, and Dubinin-Radushkevich respectively. Langmuir isotherm is found better fitted with maximum adsorption capacity of 73 mg/g by composite SB-1. R2 obtained from Langmuir isotherm is 0.999 which indicates a monolayer adsorption on the adsorbent surface. The adsorption kinetics was also well described by the pseudo-second-order equation with ...
A method to stabilize the draft through natural cooling towers is introduced. Natural draught dry... more A method to stabilize the draft through natural cooling towers is introduced. Natural draught dry cooling towers are widely used in arid regions of the world for the power industry especially those employing nuclear reactors. Their presence has become iconic of the process industry for their dominance of the landscape. These towers control the overall efficiency of power plants, and with the ongoing energy crisis it is desirable to raise efficiency by stabilising the draught through the tower. Energy comsumption is a substantial part of the overall cost of plant operation, and therefore even with a conservative 5 per cent improvement is feasible. It has been noted by some researchers like Baer, Ernst and Wurz (1980) that cooling towers do experience unstable flow with breezes. This phenomenon can be explained by JA¶rg and Scorer (1967) to occur even in a still ambience with cold air inflow down into the tower shell from exit. JA¶rg and Scorer (1967) developed a correlation to predic...
Building Resilience at Universities: Role of Innovation and Entrepreneurship, 2021
Rosiglitazone is an effective insulin-sensitizer, however, associated with bone loss mainly due t... more Rosiglitazone is an effective insulin-sensitizer, however, associated with bone loss mainly due to increased bone resorption, and bone marrow adiposity, and decreased bone formation. We investigated the effect of the co-administration of fish oil (FO) rich in omega-3 fatty acids (FAs) on rosiglitazone (RSG)-induced bone loss in aging C57BL/6 mice and the mechanisms underlying potential preventive effect. Mice fed the iso-caloric diet supplemented with fish oil exhibited significantly higher levels of bone density in different regions compared to the other groups. In the same cohort of mice, reduced activity of COX-2, enhanced activity of alkaline phosphatase, lower levels of cathepsin k, PPAR-γ, and pro-inflammatory cytokines, and a higher level of anti-inflammatory cytokines were observed. Moreover, fish oil restored rosiglitazone-induced down-regulation of osteoblast differentiation and up-regulation of adipocyte differentiation in C3H10T1/2 cells and inhibited the up-regulation o...
Photovoltaic (PV) technology is becoming more popular due to climate change because it allows for... more Photovoltaic (PV) technology is becoming more popular due to climate change because it allows for replacing fossil-fuel power generation to reduce greenhouse gas emissions. Consequently, many countries have been attempting to generate electricity through PV power plants over the last decade. Monitoring PV power plants through satellite imagery, machine learning models, and cloud-based computing systems that may ensure rapid and precise locating with current status on a regional basis are crucial for environmental impact assessment and policy formulation. The effect of fusion of the spectral, textural with different neighbor sizes, and topographic features that may improve machine learning accuracy has not been evaluated yet in PV power plants’ mapping. This study mapped PV power plants using a random forest (RF) model on the Google Earth Engine (GEE) platform. We combined textural features calculated from the Grey Level Co-occurrence Matrix (GLCM), reflectance, thermal spectral feat...
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Papers by Mizanur Rahman