bluuebunny/crossref_metadata_2025 huggingface dataset:
Silver nanoparticles: Green Synthesis using Derris trifoliata Seed Extract and It's Applications as a Sensor, Photocatalyst and Antibacterial agent
Authors: Augustine Reshma , Kollamparambil Navya S. , M. V Krishnaraj , M. Ushamani , Chandran A. Saritha
Published: March 2023

This work focuses on the preparation of silver nanoparticles (AgNPs) by a green synthesis using the seed extract of Derris trifoliata. The optimum time and temperature for the extraction of seeds were determined using FTIR analysis. The seed extract acted as a reducing agent and silver nitrate was used as the metal precursor for the preparation of AgNPs. Optimization of reaction conditions for the preparation of AgNPs and its characterization was done by UV-Vis spectroscopy, FTIR, HRTEM and SAED images. The UV- Visible spectrum of AgNPs revealed a characteristic SPR peak at 433 nm. HRTEM and SAED images confirmed nearly spherical nature of the AgNPs with a diameter of 2–20 nm. H2O2 sensing capacity and the photocatalytic dye degradation of the AgNPs was investigated using UV-Vis spectroscopy. Antibacterial activity of silver nanoparticles on E-coli bacteria was also studied using microtitre plate method.
Oxidation of few Substituted Phenols and Reaction Mechanism by Heterocyclic Pyrazinium Chlorochromate and It's Biological Activity
Authors: Senthilkumar V. , Ilavenil K. K.
Published: March 2023

The current investigation focuses on the oxidation of phenol (Phenylic acid) and a few mono substituted phenols in a liquified ethanoic acid medium with pyrazinium chorochromate (PzCC) support. The reaction showed a first kinetic model in PzCC but a fractional order in phenols. The low dielectric constant of the process, which is helped by hydrogen ions, promotes the reaction. The reaction's speed is unaffected by an increase in ionic strength. Meta-substituted phenols, which rely on the field effect for oxidation, are more susceptible to the delocalized effect than para-substituted phenols. The positive proportionality constant (ρ) indicates the presence of an electron deficit reaction site in the slow stage. Non-linearity in the Hammett plot was seen for all of the substituted phenols. An efficient mechanism and rate law were proposed following the computation of the activation and thermodynamic variables. Several gram positive and gram negative, including Entrococcus, Proteus vulgaris, Mycobacterium tuberculosis, and fungi, including A. niger, Fusarium, and Trichoderma, were examined for the antibacterial activity of the compound PzCC using the agar well diffusion method.
One-pot Multicomponent synthesis of 3-(substitutedphenyl)-5-oxo-3,4,5,6-tetrahydroimidazo[4,5-c] Pyrazole-2(1H)-carbaldehyde Derivatives Act as Antibacterial Agents
Authors: Muli Pravin Nandkumar , Muley Megha Mukund , Dawane Bhaskar Sadashiv
Published: March 2023

A new class of 3-(substituted phenyl)-5-oxo-3,4,5,6-tetrahydroimidazo[4,5-c]pyrazole-2(1H)-carbaldehyde derivatives 5(a-l) was synthesized in four-component cyclocondensation one-pot reaction. This was done using the catalytic amount of Bleaching Earth Clay (pH 12.5 wt%) and PEG-400 as a sustainable solvent. The structures of the produced substances were verified using spectral and analytical data. In vitro antibacterial activity of the targeted compounds was examined against S. Typhi, E. coli, B. subtilis, and S. aureus. The outcome of antimicrobial screening explains that compounds 5a-l showed good to moderate activities.
Characterization, Pharmacology and In-silico study of 2,4 Ditertiary Butylphenol Isolated from the leaves of Ficus auriculata Lour.
Authors: Russell.S Prasheena , Kumari.J Prema
Published: March 2023

Ficus auriculata belongs to the family of dicotyledonous plant. The general phytochemical screening for Ethanol, Hexane, Chloroform and Water extracts are done. Since ethanol shows the presence of maximum compounds, it is subjected to the isolation of phenolic compounds by TLC and Column Chromatography. On repeating this process, a white crystalline solid results, which on the basis of UV-Vis, FT-IR, GC-MS, 1H NMR, confirms that the isolated compound is 2,4 Ditertiary Butyl Phenol (2,4 DTBP). The isolated compound is further studied for its solvent effect and subjected to anti-microbial and Cytotoxicity studies with AGS cancer cell line and HIEC-6 (Human Normal Intestinal Epithelial cell line). Docking studies is carried out using Patch Dock server, with 2,4DTBP as guest and Occluding, which is a Tight Junction Protein (TJP) as host. The resulted structure is further subjected to Lipinski Rule of five. The present study concludes that 2,4 DTBP shows intermediate resistance against gram positive and gram negative bacteria like S. aureus, E. coli, Klebsiela pneumonia, strongly resistant to fungi Candida sps.
According to cytotoxic and in silico studies, the isolated compound has excellent anticancer properties and is thus used in the treatment of gastric cancer. From the Lipinski rule, it is confirmed that the drug can be administered orally.
Transient CFD Analysis of Thermal Regenerator
Authors: Kanojia Nikhil
Published: March 2023

The goal of the work is to analyze the impact of various factors on the fixed bed regenerator’s thermal characteristics while also examining the regenerator’s thermal characteristics. The thermal parameters of the regenerator are affected by a number of factors, including Heat storage capacity, switching time, residence time, bed height/length, regenerator diameter, particle diameter, and gas flow direction. The current study examines each of these variables quantitatively. Understanding the thermal regenerator’s temperature and fluid flow variations CFD analysis is conducted. For the analysis, Ansys Fluent is a for-profit program.
Influence of Phi (Φ) Shaped in Circular Ring Inserts on Thermal Performance in Circular Tube Heat Exchanger: CFD Study
Authors: Kandpal Gaurav , Singh Satyendra , Bisht Shubham , Kharkwal Himanshi
Published: March 2023

Enhancement of heat exchangers with the usage of inserts which creates turbulence in fluid flow by enhancing heat transfer rate which is an appealing area for researchers to develop efficient and compact heat exchanger with low expenses. Present work deals with computational investigation on circular tube with ϕ� shaped circular ring inserts taken as enhancer for better experience in heat transfer. The geometric dimensions of insert are 68 mm outer diameter with inner ring is half of outer diameter concentric ring having varying DR of 0.8, 0.85 and 0.9 with varying PR 3, 4 & 5 in which hydraulic diameter is 68.1 mm. The length of test section is 1500 mm with 1000 W/m22 of regular heat flux is applied and Re ranges from 3000 to 21000.

CFD analysis conducted, compared & results are presented where maximum augmentation of heat transfer could be obtained 5.02–11.21 times simultaneously TPF is 2.14–3.54 times as compared to smooth tube for inserts with DR 0.8 and PR 3 which attained maximum S˙S˙ 3.07–5.1.

Keywords: Heat exchanger, thermal performance factor, CFD analysis.

Nomenclature
Drill Hole Optimization for Augmenting Structural Integrity
Authors: Bisht Neeraj , Gairola Suvam , Shekhawat Shivam , Darshan Deep , Aithani Nitesh
Published: March 2023

Structures develop cracks during the course of there life resulting in catastrophic failures. This can be reduced by drilling holes near the crack tip. Here the aspect of optimal position and size of the drill hole has been analysed. Additionally the effect of supplementary hole has also been made. Finite element code ANSYS was used for the analysis. To verify the fracture capabilities of ANSYS the results were corroborated using photoelastic techniques. It was observed that reduction in stress intensity factor to a great extent depends upon the position of the stop hole. Also it was observed that as the radius of the crack was increased the stress intensity factor increased. Creating supplementary hole further reduced the stress intensity factor. So it can be concluded that for employing the concept of drill hole its position and size should be accurately determined.
On Unmanned Aircraft as a Security Threat
Authors: IVANČÍK Radoslav , NEČAS Pavel , LANCIK Branislav
Published: March 2023

This paper represents a continuation of the ongoing research of authors who, in the framework of interdisciplinary scientific research, deals with several aspects of ensuring the safety of the Slovak Republic and the European Union in connection with aviation, aircraft, air traffic and airspace protection. In their current research, following these and constant developments in the field of innovation and introduction of new technologies in the field of aviation, the authors deal with unmanned aircraft, which are gradually used not only in the military, but are increasingly penetrating the commercial sphere of civil aviation. Due to the fact, that the unmanned aircraft market is the fastest growing market of all categories of aviation, the authors in the article provide a theoretical and terminological view of the researched issues, including a brief historical view of the development of unmanned aircraft.
Modeling and digital calibration for the mirror normal pointing error of the 2D scanning reflector
Authors: Zhao Hongda , Li Shunhe , Jiang Tao , Hong Yuan , Ma Zhicheng
Published: March 2023

The 2D scanning reflector (2DSR) has been widely used in various important opto-mechanical systems. The pointing error of the mirror normal of the 2DSR will greatly affect the optical axis pointing accuracy. In this work, a digital calibration method for the pointing error of the mirror normal of the 2DSR is researched and verified. At first, the error calibration method is proposed based on the datum, which consists of a high-precision two-axis turntable and the photoelectric autocollimator. All the error sources, including the assembly errors and the datum errors in the calibration are analyzed comprehensively. Then the pointing models of the mirror normal are derived from the 2DSR path and the datum path by using the quaternion mathematical method. Additionally, the pointing models are linearized by the Taylor series first-order approximation of the error parameter trigonometric function items. The solution model of the error parameters is further established by using the least square fitting method. In addition, the procedure of the datum establishment is introduced in detail to strictly control the datum error to be small enough, and the calibration experiment is carried out subsequently. At last, the errors of the 2DSR are calibrated and discussed. The results show that the pointing error of the mirror normal of the 2DSR decreases from 365.68 to 6.46 arc seconds after the error compensation. The consistency of the error parameters of the 2DSR calibrated by digital calibration and physical calibration verifies the effectiveness of the digital calibration method proposed in this paper.
Transition from eigenmodes to geometric modes characterized by the quantum SU(2) coupled oscillator model: a review
Authors: Hsieh Cheng-Li , Wang Ching-Hsuan , Chung Wei-Che , Liang Hsing-Chih , Chen Yung-Fu
Published: March 2023

The quantum and classical dynamics of the SU(2) coupled oscillator model are systematically reviewed to provide the quantum eigenstates and stationary coherent states for characterizing laser transverse modes from the analogy with the quantum-classical connection. The integral formula for the representation of the stationary coherent states derived from the evolution of the time-dependent wave packet state is completely reviewed. Several calculated results for the stationary coherent states are illustratively presented to display the spatial distributions for the quantum-classical transition and the plentiful variations of phase singularities. The overall review is believed to provide a comprehensive insight into laser transverse modes characterized by the stationary coherent states of the SU(2) coupled oscillator model.
A Machine Learning Framework for the Quantification of Experimental Uveitis in Murine OCT
Authors: Mellak Youness , Achim Alin , Ward Amy , Nicholson Lindsay , Descombes Xavier
Published: March 2023

This paper presents methods for the detection and assessment of non-infectious uveitis, a leading cause of vision loss in working age adults. In the first part, we propose a classification model that can accurately predict the presence of uveitis and differentiate between different stages of the disease using optical coherence tomography (OCT) images. We utilize the Grad-CAM visualization technique to elucidate the decision-making process of the classifier and gain deeper insights into the results obtained.
In the second part, we apply and compare three methods for the detection of detached particles in the retina that are indicative of uveitis. The first is a fully supervised detection method, the second is an unsupervised technique, and the third is a weakly supervised segmentation that produces per-pixel masks as output.
The segmentation model is used as a backbone for a fully automated pipeline that can segment small particles of uveitis in 2D slices of the retina, reconstruct the volume, and produce centroids as points distribution in space. The number of particles in retinas is used to grade the disease, and point process analysis on centroids in (3D) shows clustering patterns in the distribution of the particles on the retina.
Culturally adapting a mindfulness and acceptance-based intervention to support the mental health of adolescents on antiretroviral therapy in Uganda
Authors: Musanje Khamisi , Camlin Carol S. , Kamya Moses R. , Vanderplasschen Wouter , Louise Sinclair Deborah , Getahun Monica , Kirabo Hope , Nangendo Joan , Kiweewa John , White Ross G. , Kasujja Rosco
Published: March 2023

The dual burden of living with HIV and negotiating life stage changes has been identified as a contributing factor to lapsed adherence among adolescents with HIV in sub-Saharan Africa. While psychosocial support can promote medication adherence, most interventions in use with adolescents were originally developed for the general population creating a gap in appropriate support. Life-stage-appropriate, evidence-based psychosocial support interventions have been used with young people in high-income contexts, prompting interest in their use in low-income contexts. However, many interventions are less effective when implemented outside of their original settings, hence the need for modifications before implementation. We aimed to culturally adapt an evidence-based psychosocial support intervention designed to improve the mental health of young people for use among adolescents with HIV in a sub-Saharan African context and to explore the acceptability of the adapted intervention among adolescents. We engaged thirty stakeholders (n = 30) in Kampala, Uganda including psychologists, psychiatrists, social workers, HIV counselors, religious leaders and adolescent peers from December 2021 to April 2022 to modify an evidence-based intervention for adolescents. Key adaptations included simplifying the language, adding local practices, integrating locally relevant slang and stories into therapy, introducing racially-congruent visuals and cards representing emotions, and adjusting therapy materials for use in resource-constrained settings. We then tested the acceptability of the intervention in a small sample of service users using a qualitative approach. We recruited nine adolescents with HIV from a participating clinic in Kampala, delivered six 90-minute sessions of the adapted intervention across three weeks and conducted in-depth interviews to assess the acceptability of the intervention. We used thematic analysis to analyze the qualitative data. The adapted intervention was perceived as acceptable among adolescents with HIV, with many stating that it helped them overcome fears, increased their self-acceptance, and gave them the confidence to make careful health-enhancing decisions.
Theoretical framework for a decision support system for micro-enterprise supermarket investment risk assessment using novel picture fuzzy hypersoft graph
Authors: Saeed Muhammad , Harl Muhammad Imran , Saeed Muhammad Haris , Mekawy Ibrahim
Published: March 2023

Risk evaluation has always been of great interest for individuals wanting to invest in various businesses, especially in the marketing and product sale centres. A finely detailed evaluation of the risk factor can lead to better returns in terms of investment in a particular business. Considering this idea, this paper aims to evaluate the risk factor of investing in different nature of products in a supermarket for a better proportioning of investment based on the product’s sales. This is achieved using novel Picture fuzzy Hypersoft Graphs. Picture Fuzzy Hypersoft set (PFHSs) is employed in this technique, a hybrid structure of Picture Fuzzy set and Hypersoft Set. These structures work best for evaluating uncertainty using membership, non-membership, neutral, and multi-argument functions, making them ideal for Risk Evaluation studies. Also, the concept of the PFHS graph with the help of the PFHS set is introduced with some operations like the cartesian product, composition, union, direct product, and lexicographic product. This method presented in the paper provides new insight into product sale risk analysis with a pictorial representation of its associated factors.
Embryonic and post-embryonic development in the parasitic copepod Ive ptychoderae (Copepoda: Iviidae): Insights into its phylogenetic position
Authors: Cheng Yu-Rong , Lin Ching-Yi , Yu Jr-Kai
Published: March 2023

Parasitic copepods are frequently discovered in many marine animals, and they exhibit great species diversity with remarkable morphological adaptations to their parasitic lifestyle. Similar to their free-living relatives, parasitic copepods usually develop through complex life cycle, but they eventually transform into a modified adult form with reduced appendages. Although the life cycle and distinct larval stages have been described in a few species of parasitic copepods, particularly those infecting commercially valuable marine animals (such as fishes, oysters, and lobsters), very little is known about the developmental process of the species that transformed into extremely simplified adult body plan. This paucity also causes some difficulties when investigating the taxonomy and phylogeny of this kind of parasitic copepods. Here we describe the embryonic development and a series of sequential larval stages of a parasitic copepod, Ive ptychoderae, which is a vermiform endoparasite living inside the hemichordate acorn worms. We devised laboratory regimes that enable us raising large quantity of embryos and free living larvae, and obtaining post-infested I. ptychoderae samples from the host tissues. Using defined morphological features, the embryonic development of I. ptychoderae can be categorized into eight stages (1-, 2-, 4-, 8-, 16- cell stages, blastula, gastrula, and limb bud stages) and the post-embryonic development comprises six larval stages (2 naupliar and 4 copepodid stages). Based on the comparisons of morphological characters in the nauplius stage, our results provide evidence to support that the Ive-group is more closely related to the Cyclopoida, which represents one of the two major clades that contain many highly transformed parasitic copepods. Thus, our results help to resolve the problematic phylogenetic position of the Ive-group in previous study based on analysis using 18S rDNA sequences. Combining with more molecular data, future comparative analyses on the morphological features of copepodid stages will further refine our understanding of the phylogenetic relationships of parasitic copepods.
Structural, programmatic, and sociocultural intersectionality of gender influencing access-uptake of reproductive, maternal, and child health services in developing regions of Ethiopia: A qualitative study
Authors: Kebede Yohannes , Teshome Firanbon , Binu Wakgari , Kebede Ayantu , Seid Anwar , Kasaye Habtamu K. , Alemayehu Yibeltal Kiflie , Tekalign Wondimagegn , Medhin Girmay , Abera Yared , Tadesse Derebe , Gerbaba Mulusew J.
Published: March 2023

Background

Gender remains a critical social factor in reproductive, maternal, and child health and family planning (RMNCH/FP) care. However, its intersectionality with other social determinants of the RMNCH remains poorly documented. This study aimed to explore the influence of gender intersectionality on the access uptake of RMNCH/FP in Developing Regional States (DRS) in Ethiopia.

Methods

We conducted a qualitative study to explore the intersectionality of gender with other social and structural factors and its influence on RMNCH/FP use in 20 selected districts in four DRS of Ethiopia. We conducted 20 Focus Group Discussions (FGDs) and 32 in-depth and key informant interviews (IDIs/KIIs) among men and women of reproductive age who were purposively selected from communities and organizations in different settings. Audio-recorded data were transcribed verbatim and analyzed thematically.

Findings

Women in the DRS were responsible for the children and families’ health care and information, and household chores, whereas men mainly engaged in income generation, decision making, and resource control. Women who were overburdened with household chores were not involved in decision-making, and resource control was less likely to incur transport expenses and use RMNCH/FP services. FP was less utilized than antenatal, child, and delivery services in the DRS,as it was mainly affected by the sociocultural, structural, and programmatic intersectionality of gender. The women-focused RMNCH/FP education initiatives that followed the deployment of female frontline health extension workers (HEWs) created a high demand for FP among women. Nonetheless, the unmet need for FP worsened as a result of the RMNCH/FP initiatives that strategically marginalized men, who often have resource control and decision-making virtues that emanate from the sociocultural, religious, and structural positions they assumed.

Conclusions

Structural, sociocultural, religious, and programmatic intersectionality of gender shaped access to and use of RMNCH/FP services. Men’s dominance in resource control and decision-making in sociocultural-religious affairs intersected with their poor engagement in health empowerment initiatives that mainly engaged women set the key barrier to RMNCH/FP uptake. Improved access to and uptake of RMNCH would best result from gender-responsive strategies established through a systemic understanding of intersectional gender inequalities and through increased participation of men in RMNCH programs in the DRS of Ethiopia.
Diseño técnico de un sistema de cuantificación de metano portable y de bajo costo
Authors: Tovar-Sánchez Juan Andres , Arias-Molina Juan Francisco , Milquez-Sanabria Harvey Andrés , Mayorga-Castellanos Manuel Alejandro
Published: March 2023

Contexto: A partir de un análisis desarrollo de la tecnología en biodigestores, se observó un problema recurrente en la cuantificación rigurosa del metano. mediante una revisión bibliográfica reveló sistemas poco eficientes o de costos elevados. Este proyecto plantea un sistema accesible y eficaz que busca contribuir a proyectos académicos y de investigación afines. Método: La cuantificación de metano se realiza mediante un sensor de la serie MQ-4 acoplado a una cápsula, creando un medio parcialmente cerrado en el que se inyecta, por medio de una jeringa, una dilución de gases de muestra de metano con aire del ambiente, lo cual amplía el rango de medición del sensor. Resultados: Se elaboró una curva de calibración, ampliando el rango de medición de 0,02-1 % de concentración a 10-80 %v/v, con una varianza de ± 5 %. Conclusiones: Se desarrolló un prototipo de cuantificación de metano eficiente y accesible para uso académico y de investigación. Esto se complementa con una guía para replicar el proceso.
ABB, a salient prototype of collocate–ideophone constructions in Mandarin Chinese
Authors: Van Hoey Thomas
Published: March 2023

ABB words in Chinese, e.g., hēi-qīqī ‘pitch black’, have been studied for a long time. Most traditional studies analyze these words through derivational rules involving empty suffixes. However, this is problematic, as they are better seen as compounds involving a prosaic A and an ideophonic BB part. By treating ABB as a schema sanctioned by collocate–ideophonic constructions, it is possible to investigate other similar patterns. A corpus study (more than 5,000 tokens) revealed that on the level of schemas, ABB truly acts as a prototype of such constructions, but that it is far from the only pattern to be identified. A second corpus-based study on the level of exemplars showed there are different pockets of salience and non-uniformity in the data from four angles: cue validity, frequency, dispersion, and constructional preference. This paper provides evidence that the traditional ABB narrative needs to be complemented with usage-based data, and grapple with the lexical salience effects this brings along for words involving iconicity.
Study of NAD-interacting proteins highlights the extent of NAD regulatory roles in the cell and its potential as a therapeutic target
Authors: Duarte-Pereira Sara , Matos Sérgio , Oliveira José Luís , Silva Raquel M.
Published: March 2023

Nicotinamide adenine dinucleotide (NAD) levels are essential for the normal physiology of the cell and are strictly regulated to prevent pathological conditions. NAD functions as a coenzyme in redox reactions, as a substrate of regulatory proteins, and as a mediator of protein-protein interactions. The main objectives of this study were to identify the NAD-binding and NAD-interacting proteins, and to uncover novel proteins and functions that could be regulated by this metabolite. It was considered if cancer-associated proteins were potential therapeutic targets. Using multiple experimental databases, we defined datasets of proteins that directly interact with NAD – the NAD-binding proteins (NADBPs) dataset – and of proteins that interact with NADBPs – the NAD-protein–protein interactions (NAD-PPIs) dataset. Pathway enrichment analysis revealed that NADBPs participate in several metabolic pathways, while NAD-PPIs are mostly involved in signalling pathways. These include disease-related pathways, namely, three major neurodegenerative disorders: Alzheimer’s disease, Huntington’s disease, and Parkinson’s disease. Then, the complete human proteome was further analysed to select potential NADBPs. TRPC3 and isoforms of diacylglycerol (DAG) kinases, which are involved in calcium signalling, were identified as new NADBPs. Potential therapeutic targets that interact with NAD were identified, that have regulatory and signalling functions in cancer and neurodegenerative diseases.
Microstructure analysis, constitutive relationship, and processing map of novel pre-aged Mg-Zn-Gd-Er alloy with different deformation ranges
Authors: Che Bo , Lu Liwei , Wang Lifei , Yang Yan , Qi Fugang , Ma Min , Zhao Hongmei
Published: March 2023

Pre-aged Mg-6Zn-1Gd-1Er alloy is a novel rapid aging hardening Mg alloy, and studying its hot deformation behavior has an important role in promoting the development of lightweight alloy materials. To study this, the flow stress curves of pre-aged Mg-6Zn-1Gd-1Er alloy at 180–380 °C and 10−3−10 s−1 were obtained by isothermal compression tests. The constitutive equations of the medium-high temperature deformation (MHTD) and the low-temperature deformation (LTD) were established, and their activation energies were 155.78 kJ mol−1 and 178.00 kJ mol−1, respectively. Based on the constitutive equation analysis, the glide and climb of dislocations and the cross-slip of dislocations was the deformation mechanism during MHTD and LTD, respectively. In order to determine the appropriate hot processing parameters, the hot processing map of the pre-aged Mg-6Zn-1Gd-1Er alloy under 0.2–0.8 strain was constructed based on the dynamic material model. The hot processing maps indicate that this pre-aged alloy at low temperature (180–230 °C) and high strain rates (1–10 s−1) mainly occurs flow instability, and the optimal hot processing window appears at a 330–380 °C and 10−3 to 10−2 s−1 range. Furthermore, the deformation mechanism of the stable domain with high power dissipation efficiency in the hot processing map was continuous dynamic recrystallization, discontinuous dynamic recrystallization, and particle-stimulated nucleation mechanisms.
Effects of process parameters on strengthening mechanisms of additively manufactured AlSi10Mg
Authors: Gökdağ İstemihan , Acar Erdem
Published: March 2023

In industries like automotive and aerospace, the demand for structures with a high strength-weight ratio is increasing. Additive manufacturing (AM) studies and applications of AlSi10Mg material have increased due to the improvement of mechanical properties when the production is performed at high cooling rates in the laser-powder bed fusion (L-PBF) method. The study aims to investigate the effect of the AM process parameters on the microstructure features, and determine the mathematical relationship between yield strength and process parameters to obtain better mechanical properties. In this study, AlSi10Mg specimens are manufactured using L-PBF method with different process parameters. Microstructure images of the manufactured specimens are obtained by scanning electron microscopy. Melt pool width, eutectic cell size and diameter of Si precipitates are measured using the microstructure images. Parametric equations are generated between the process parameters and microstructural features including eutectic cell size and Si precipitate diameter. Thus, relationships between strengthening mechanisms and process parameters are established by integrating the generated equations into the related strengthening mechanisms. Consequently, the yield strength model of AlSi10Mg material is developed as a function of the process parameters of L-PBF method. It is found that the developed model estimates close results to the nano-indentation results.
Hydride formation mechanisms in Zr-containing amorphous alloys during sample preparation and atom probe tomography
Authors: Yipyintum Chetarpa , Lee Ji Yeong , Suh Jin-Yoo , Lohwongwatana Boonrat
Published: March 2023

Hydride formation in Zr-containing amorphous alloys as an experimental artifact was investigated utilizing atom probe tomography, transmission electron microscopy, and focused ion beam with normal and cryogenic conditions. The amount of hydrogen existing in the atom probe specimens decreased significantly by utilizing focused ion beam milling under cryogenic condition. Also, the formation of hydride was confirmed by diffraction pattern analysis in the remaining tip of the specimen after the atom probe tomography experiment. With those collected pieces of evidence, sources of hydrogen in the atom probe tomography were discussed.
Experimental and numerical investigation of expansion corner effects on isolator performance
Authors: Quadros Jaimon D. , Khan Sher Afghan , Prashanth T.
Published: March 2023

In the present study, the effect of expansion corner on suddenly expanded flow process has been studied. Experimental investigations have been carried out on a convergent-divergent (C-D) nozzle and isolator duct, where the expansion of the channel is formed through the presence of a 1, 2 and 3 expansion corners (EC) respectively. Flow from nozzle exit of the nozzle of Mach, M = 2.0 was suddenly expanded into the axi-symmetric duct having a cross sectional area of 4.84 times the nozzle exit area. The wall static pressure along the length of the duct and the Pitot pressure at the exit plane of the duct were measured for all the configurations. Computational fluid dynamics (CFD) technique was employed for visualizing the shock-train in the expanded duct. The isolator with one expansion corner was found to be more efficient in achieving a high static pressure rise. The experimental and numerical wall static pressure distribution values were compared for isolators with EC = 2 and found to be in good agreement with each other with a maximum absolute percentage deviation of 11%.
Transatlantic Crossings
Authors: Rossipal Christian
Published: March 2023

This article traces the transatlantic crossings and overlooked career of the expatriate Black American filmmaker Madubuko Diakité and analyzes his limited but rich body of work. It argues that Diakité should be understood as part of an internationalism grounded in the Black radical tradition but irreducible to fixed identity categories. It also contends that Diakité’s work is boundary-crossing in an aesthetic sense: by infusing the moving image with a polyvocal, socio-aesthetic sounding—a poetics of sonic displacement—Diakité unsettles the racial regime of representation and opens new fugitive pathways.
Millennial Messiahs, Female Fixers, and Corporate Boards
Authors: Parks Lisa , Twine France Winddance
Published: March 2023

This article explores how television dramas function as a cultural forum on the workplace power dynamics of US tech startups. Focusing on the limited series, Super Pumped and WeCrashed, which are about Uber and WeWork, the authors analyze how relations of race, class, and gender/sexuality emerge in these narrativized techworlds via several “figures,” including white male founders/CEOs or “millennial messiahs,” “female fixers” that range from executives to silent service providers, and the “corporate board.” These figures are important because they circulate across fictional and non-fictional contexts and become a means by which publics make sense of the power relations of tech startups. Even as these shows center on the trials and tribulations of egomaniacal, power-hungry CEOs, they raise crucial questions about corporate corruption, gender/racial discrimination, and labor exploitation in the tech workplace and challenge viewers to reckon with the unchecked power of the big US technology companies.
Can’t No Grave Hold My Body Down
Authors: Gillespie Michael Boyce
Published: March 2023

The filmmaker Keisha Rae Witherspoon has said, “Film is a type of spell.” In her short film T (2019), she conjures a conceit of how to carry the dead or how to imagine living on with and without them. Set in Liberty City, Miami’s historically black neighborhood, T poignantly stages a notion of memorialization that refigures mourning as incarnation spectacles that refuse to be held suspended by the grief, ache, representational recurrence, and despair over black death. In this essay, Michael Boyce Gillespie examines how T’s staging of a ball devoted to the celebration of the black dead emplots the cultural legacies of black death and precarity within a praxis of resistance, survival, and the fabulous.
Aerobics on Tape
Authors: Ouellette Laurie
Published: March 2023

Set in the early 1980s in San Diego, California, Physical (Apple TV+, 2021−) dramatizes the emergence of aerobics on videotape, a prescient chapter of media history that promised to transform female viewers into the masters of their bodies, lives, and futures. Although not a feminist critique, the series is an exploration of the vicissitudes of a self-empowerment. As media technology has become more interactive, the message that women can achieve an Instagrammable body by following the self-help regimens of modern-day Sheilas has become even more pervasive—and insidious. At a time when empowerment is sold on T-shirts and technologies of the self are peddled by countless influencers, Physical offers a genealogy of these taken-for-granted realities. An overdue tribute to a form of mass culture that is usually not taken seriously, even in media circles, Physical offers the unsettling possibility that self-empowerment has become the cause of women’s problems, not their solution.
Viola’s Body
Authors: Wanzo Rebecca
Published: March 2023

FQ columnist Rebecca Wanzo never expected to see Hollywood produce a film like The Woman King (Gina Prince-Bythewood, 2022), an action film led by a dark-skinned Black woman in her fifties, starring other Black women, and focused on the intimacy between them. In this column, Wanzo explores The Woman King’s radical depiction of real Black women’s bodies experiencing the erotic as power—an idea borrowed from the Black feminist lesbian poet Audre Lorde—in a Hollywood action film. In its difference, The Woman King highlights the ironic lack of embodiment and limited sensory palate offered by so many action films and reimagines the genre’s possibilities for cinematic pleasure.
STUDY THE ROLE OF EFFECTIVE PARAMETERS IN ENHANCEMENT OF THE SILICON SOLAR CELL PERFORMANCE USING PC1D SIMULATION
Authors:   Department of physics, Faculty of Science, University of Mosul, 41002 Mosul, Iraq, AHMED M. S. , AHMAD S. M. ,   Department of physics, Faculty of Science, University of Mosul, 41002 Mosul, Iraq, SUBHYALJADER M. ,   Department of physics, Faculty of Science, University of Mosul, 41002 Mosul, Iraq
Published: March 2023

The increased spread of the solar cell in the market relies on an improvement of the performance of silicon solar cell which is through study the role of effective parameters and focus on it to improve performance. In this study, detailed modelling of the solar cell was carried out so as to identify key parameters impacting efficiency. The impact of various parameters such as base resistivity, emitter doping concentration, front and rear surface recombination, back surface field, minority carrier lifetime, surface reflection and series and shunt resistance were investigated using PC1D software simulation. We are found that the top doping for emitter, bulk and back surface field were between 1×1019 cm3 and 1×1020 cm-3 . Where, the efficiency can be impacted by 2.7 % through emitter concentration variation, 1.5 % through FSRV, 1% through BSRV, and 1 % through bulk resistivity. The largest variation was observed for the minority carrier lifetime; it was observed that low lifetimes (~ 10-20 μs) are sufficient for efficiency of ~ 18 %. As for the surface reflection is concerned each 10 % increase in absolute reflection results in approximately 2 % efficiency reduction. As the largest variation was observed for the series and shunt resistance; it was observed that low series resistance (~ 0.01) and high shunt resistance (~ 100) are sufficient for the efficiency of ~ 19 %. The results from this simulation found that key parameters to improve the solar cell performance lay by optimizing emitter concentration, reduce surface reflection, series resistance low as possible, and shunt resistance high as possible.
IMPACT OF Ni DOPANT ON OPTICAL AND MAGNETIC PROPERTIES OF ZnO NANOPARTICLES FOR BIOMEDICAL APPLICATIONS
Authors:   Department of Physics, Government College University Faisalabad (GCUF), Allama Iqbal Road, Faisalabad, 38000, Pakistan, MUNIR T. , MAHMOOD A. ,   Department of Physics, Government College University Faisalabad (GCUF), Allama Iqbal Road, Faisalabad, 38000, Pakistan, KASHIF M. ,   Department of Physics, Government College University Faisalabad (GCUF), Allama Iqbal Road, Faisalabad, 38000, Pakistan, SOHAIL A. ,   Department of Physics, Government College University Faisalabad (GCUF), Allama Iqbal Road, Faisalabad, 38000, Pakistan, SHIFA M. S. ,   Department of Physics, Government College University Faisalabad (GCUF), Allama Iqbal Road, Faisalabad, 38000, Pakistan, SHARIF M. ,   Department of Physics, Government College University Faisalabad (GCUF), Allama Iqbal Road, Faisalabad, 38000, Pakistan, MANZOOR S. ,   Department of Physics, Government College University Faisalabad (GCUF), Allama Iqbal Road, Faisalabad, 38000, Pakistan
Published: March 2023

In this work, Zn1-xNixO NPs with different concentration (x= 0.0, 0.03, 0.06 and 0.09) were synthesized by using co-precipitation method. The present study is related to investigate crystal structure, surface morphology, optical and magnetic behavior of pure and Ni dopant ZnO NPs. The hexagonal wurtzite structure and crystallite size (19.45 to 21.25 nm) was investigated by using XRD analysis.SEM and FTIR used to identify the surface morphology, stretching and vibrational modes of different functional groups (ZnO, OH, CO and H-O-H) attached on the spectrum of Ni dopant ZnO NPs. Moreover, the optical behavior of Ni dopant ZnO NPs was studied by UV-visible spectroscopy which indicates the absorption band of red shift. Finally, VSM analysis illustrated that Ni dopant ZnO NPs shows high magnetization, retentivity and low corecivity as compare to pure ZnO NPs. In an overall assessment the Ni dopant ZnO NPs shows better optical and magnetic properties for biomedical applications.
Malondialdehyde and antioxidant content of pasteurized, semi-skimmed UHT and UHT milks
Authors: Kazak Filiz
Published: March 2023

Amaç: Bu çalışmada pastörize, yarım yağlı UHT ve UHT sütlerin oksidan ve antioksidan parametrelerinin değerlendirilmesi için malondialdehit (MDA), vitamin (Vit) C, total protein (TP), redükte glutatyon (rGSH) ve katalaz (CAT) belirlenmesi ve bu parametreler arasındaki korelasyonların ortaya çıkarılması amaçlandı.
Gereç ve Yöntem: Hatay ilinde farklı marketlerden farklı markalara ait 30 adet süt örneği toplandı. Süt MDA, Vit C, TP, rGSH düzeyleri ve CAT aktiviteleri spektrofotometrik yöntemlerle belirlendi.
Bulgular: En düşük MDA düzeyi yarım yağlı UHT sütte belirlendi (p < 0,05). Pastörize sütün MDA düzeyi yarım yağlı UHT sütten daha yüksekti (p < 0,05). Pastörize sütlerde Vit C (p < 0,001) ve TP (p < 0,01) düzeyleri diğer sütlere göre daha yüksek bulundu. Pastörize ve UHT sütlerin rGSH düzeyleri, yarım yağlı UHT sütlere göre daha yüksekti (p < 0,05). UHT yarım yağlı süt CAT aktivitesi diğer sütlere göre oldukça yüksek bulundu (p < 0,05). Korelasyonlar açısından; pastörize süt MDA seviyesi, Vit C seviyesi ile pozitif korelasyon gösterdi (r = 0,743, p < 0,01). Yarım yağlı UHT süt TP seviyesi, CAT aktivitesi ile pozitif korelasyon gösterdi (r=0,673, p < 0,05).
Öneriler: Sonuç olarak sunulan çalışmada, pastörize, yarım yağlı UHT ve UHT sütün oksidan (MDA), antioksidan parametreleri (Vit C, rGSH, and CAT), ve TP düzeyleri değerlendirildi ve tartışıldı. Bu çalışmada araştırılan değerler açısından, pastörize süt tüketiminin diğer ticari sütlere göre daha sağlıklı olabileceği önerilmektedir.
Investigation of some biochemical parameters in bitches with malignant mammary tumors
Authors: Safak Tarik
Published: March 2023

Amaç: Bu çalışmada, meme tümörü olan dişi köpeklerde biyokimyasal parametrelerin cut-off değeri belirlenerek teşhis için biyobelirteç olarak kullanılabilirliği araştırıldı.
Gereç ve Yöntem: Kliniğimize rutin ovariohisterektomi için getirilen (kontrol grubu, n = 14) ve meme tümörü olan (CMT grubu, n = 14) dişi köpekler çalışmaya dahil edildi. Biyokimyasal parametrelerden albümin (ALB), alkalin fosfataz (ALP), alanin aminotransferaz (ALT), aspartat aminotransferaz (AST), gama-glutamiltransferaz (GGT), total protein (TP), direkt bilirubin (DB), total bilirubin (TB), kreatin, kreatin kinaz-N-asetil-sistein (CK-NAK), üre, fosfor (P), magnezyum (Mg) ve kalsiyum (Ca) düzeyleri otomatik bir biyokimya analizör ile ölçüldü.
Bulgular: ALP (p: 0,048), ALT (p < 0,000), AST (p: 0,043), GGT (p: 0,013), TP (p: 0,010), DB (p: 0,043), TB (p: 0,018), kreatin (p < 0,000), P (p < 0,000) ve CK-NAC (p < 0.000) düzeyleri CMT grubunda kontrol grubuna göre daha yüksek anlamlı bulundu. Mg (p < 0,000) düzeyi kontrol grubunda daha yüksek olmasına rağmen, gruplar arasında ALB, üre ve Ca düzeyleri için istatistiksel olarak fark bulunmadı (p > 0,05). ALP, ALT, AST, GGT, TP ve kreatin düzeylerinin, sırasıyla 0.656, 0.831, 0.610, 0.792, 0.942 ve 0.974 eğri altında kalan alan değerleri ile meme tümörlerinin teşhisi için kullanılabileceği görüldü.
Öneriler: ALP, ALT, AST, GGT, TP ve kreatinin köpek meme tümörü için yardımcı tanı araçları olabileceği kanısına varıldı.
Aporte de los laboratorios remotos a la alfabetización científica: Un caso de estudio
Authors: Zárate-Moedano Ramón , Canchola-Magdaleno Sandra Luz , Suarez-Medellín Jorge
Published: March 2023

Objetivo. Evaluar si la utilización de laboratorios remotos como material didáctico mejora los conocimientos, habilidades y actitudes y desarrolla el nivel de alfabetización científica del alumnado de telesecundaria. Metodología. La metodología aplicada es mixta, cuasiexperimental pretest-postest. Las personas participantes es todo el estudiantado de segundo grado de secundaria (n=21) y la maestra del grupo correspondiente a la asignatura de ciencias (física). La recolección de datos se hace con cuestionarios y recolección de evidencias de aprendizaje. Para su análisis se llevó a cabo una prueba t para muestras independientes de las diferencias de la calificación postest/pretest entre estudiantes que utilizaron los laboratorios remotos y estudiantes pertenecientes al grupo de control, así como la triangulación de datos cuantitativos y cualitativos. Resultados. Los resultados y principales hallazgos muestran que los laboratorios remotos ayudan a desarrollar la alfabetización científica del estudiantado. El grupo que utilizó los laboratorios remotos mostró una mejoría de dos puntos en promedio en los resultados de la prueba postest con respecto a la prueba pretest, mientras que en el caso del grupo control no existe dicha mejoría. Conclusiones. Tanto la facilidad de uso como la pertinencia de los laboratorios electrónicos en la enseñanza de las ciencias favorecen la selección de actividades de indagación y evidencias experimentales de aprendizaje a través de la interacción física con fenómenos naturales. Recomendaciones. Si bien los laboratorios electrónicos no sustituyen un laboratorio formal, el uso de esta tecnología permite crear un laboratorio escolar fácil de utilizar, por lo cual es particularmente importante su integración en contextos escolares con recursos escasos.
Retórica de la novela histórica de tema colonial en la República Restaurada. Hecho retórico y res extensional
Authors: Hernández Landa Valencia Verónica
Published: March 2023

Este artículo destaca las tendencias ideológicas y retóricas que rodean la producción y publicación de las novelas históricas de tema colonial publicadas en México durante la República Restaurada (1867-1872). Con ello se persiguen tres objetivos: contribuir al conocimiento del desarrollo de las novelas históricas del siglo XIX, el cual ha recibido hasta ahora poca atención; enfatizar la importancia del estudio del contexto y de las intenciones del autor para la comprensión de cierto tipo de manifestaciones literarias, y, finalmente, participar activamente en la tendencia actual de los estudios literarios a desarrollar métodos de análisis retórico que consideran al texto como un fenómeno global que implica necesariamente una función comunicativa.
Chaplin y el exilio: análisis comparativo desde la visión de Hannah Arendt y María Zambrano
Authors: Gutierrez Bracho Carlos
Published: March 2023

Los ensayos «Charlot o el histrionismo» y «Charlie Chaplin: el sospechoso», de María Zambrano y Hannah Arendt, respectivamente, dan origen a una reflexión sobre la condición del exiliado en el siglo XX, a partir del arte de Charles Chaplin. En él, las autoras hacen un análisis de la propuesta artística del actor, basada en el hombre marginado por la sociedad, pero reflejada en la suya propia. Charlot se convierte en objeto de la mirada para discutir sobre exilio, las razones del arte y el valor de la palabra frente al silencio
El ojo y la mano: Construcción pictolingüística de la escritura umbraliana
Authors: Bengoa Mardaras Javier , De Buron Brun Bénédicte
Published: March 2023

Ante el ingente legado que nos ha dejado Francisco Umbral, el investigador se pregunta cómo pudo escribir una prosa poética tan magnífica y mucho más profunda de lo que se suele pensar. Aunando las dos pasiones del autor, la escritura y la pintura, este artículo intenta remontarse a la génesis de la obra umbraliana y adentrarse en los laberintos de su cerebro en el que mano, ojo y mente interactúan para generar un trenzado de imágenes, mediante una construcción pictolingüística que le configura un estilo único, nunca superado hasta la fecha.