bluuebunny/crossref_metadata_2025 huggingface dataset:
Effects of Feedstock Shape on the Qualities of Cold-Sprayed Cu Coatings
Authors: Ko K. , Choi J. , Lee H. , Lee H.
Published: June 2023

The aim of this study is to determine how feedstock shape affects deposition efficiency and coating formation in cold spraying. Spherical and irregular-shaped Cu powders were sprayed on Al substrates at gas temperatures ranging from 100 to 650 °C. Rebound particles were collected and examined and various coating qualities were assessed, including deposition efficiency, hardness, stack morphology, and adhesion strength. In order to explain certain discrepancies between predicted and measured data, as-sprayed and heat-treated coatings were compared and powder hardness was analyzed in detail. Contrary to simple theoretical hydrodynamic simulations, the critical threshold velocity for irregular particles was higher than that of the spherical ones. The results and practical implications of the study are discussed in the paper.
Tomographic Particle Localization and Velocity Measurement
Authors: Kirner S. , Forster G. , Schein J.
Published: June 2023

This paper presents an innovative method for thermal spray particle diagnostics. In the demonstration, twelve CCD cameras are arranged around the spray cone created by a wire arc gun. The cameras are aligned radially with 15° offsets and are synchronized with a hardwired trigger. Images simultaneously captured from different directions contain information from which the location and trajectory of the particles can be determined. In addition to describing the setup of the camera system, the paper also develops the mathematics required for image processing and the calculation of 3D particle trajectories and velocity distributions.
The Deposition Behavior and Bonding Features of Kinetic Sprayed Mixed Al-Ni Binary Metallic Powders
Authors: Kim J. , Byun G. , Lee C.
Published: June 2023

Mechanically mixed Al-Ni powders with different nickel fractions were deposited on Cu substrates by kinetic spraying. Deposition efficiency and porosity were measured and finite element analysis was used to model single and multiple particle impacts. Increasing the fraction of nickel in the feedstock powder reduced the porosity of the Al-Ni coatings but at the expense of deposition efficiency. The reason for this is explained based on particle velocity measurements and impact models. With that information, dense, well adhered coatings were produced by increasing the tamping effect of Ni, resulting in local melting of the Al at the Al-Ni interface.
Annealing Treatment on the Microstructure and Properties of Cold-Sprayed FeAl-40%WC Composite Coating
Authors: Wang H.-T. , Chen X. , Bai X.-B. , Ji G.-C. , Dong Z.-X.
Published: June 2023

This study evaluates the effect of annealing on the microstructure, hardness, and wear resistance of FeAl-WC coatings obtained by cold spraying. As-sprayed deposits exhibited a dense microstructure with uniformly dispersed WC particles in the iron matrix. The Fe(Al) solid solution was transformed to an FeAl intermetallic compound at around 650 °C. Further increases in temperature were found to improve the composite microstructure with a slight decrease in microhardness. Wear resistance peaked at 750 °C, and at 950 °C, a diffusion layer appeared at the bottom of the coating close to the substrate.
Numerical Simulation of the Minimal Bonding Strength to Overcome Rebounding in Cold Spraying Cu/Cu
Authors: Wang K. , Kong L. , Cui X. , Tao Y. , Li T. , Xiong T.
Published: June 2023

In cold spraying, several theories have been presented to explain the bonding between the substrate and coatings. In this work, finite element simulations were performed to obtain the minimal bonding strength to overcome rebounding at different initial velocities. The correlation with critical deposition velocity is also discussed.
Researches Regarding the Structure Investigations on New Materials of the Composite Type
Authors: Cernaianu A. A.
Published: June 2023

This paper presents the results of metallographic investigations of electric arc sprayed composite coatings for the manufacture or refurbishment of bearing components. The materials studied include iron aluminide and aluminum bronze, and their interface microstructure was examined by optical and environmental scanning electron microscopy (ESEM).
The Influence of the Pass Number on the Abradability of Al-Based Coating
Authors: Yu Y. , Liu J. , Shen J. , Liu T.
Published: June 2023

A series of abradability tests were conducted on AlSi-hBN coatings, which are commonly used in the compressor section of aeroengines for clearance control. The coatings were sprayed on test plates to a thickness of 1.9-2.0 mm and ground to a finish of 10 μm with 400 grit paper. The tests were carried out in an automated test rig with adjustable temperature, blade tip velocity, and incursion rate. The rig is configured such that the coatings are exposed to rotating blades, making contact with the tips as they pass. In this study, investigators monitored the number of contacts, removing and examining abraded coating samples at a given count total ranging from 200 to 4000. It was found that wear characteristics change with each contact between the coating and blade tip, indicating that pass number is a factor that must be considered when testing abradable coatings.
Microstructure and Properties of Suspension Plasma Sprayed SrTiO3-Based Anodes for Intermediate-Temperature Solid Oxide Fuel Cells
Authors: Zhang S.-L. , Li C.-X. , Li C.-J.
Published: June 2023

Lanthanum-doped strontium titanate (LST) and samarium-doped ceria (SDC) are promising materials for intermediate-temperature solid oxide fuel cells (IT-SOFCs). In this study, LST-SDC composite anodes are produced by suspension plasma spraying and the effects of annealing are assessed. XRD results show that the coatings and powders have the same phase structure. The coatings have a fine porous structure which is beneficial for gas permeability and long three-phase boundaries that facilitate anode reactions. A single cell based on the LST-SDC composite anode was found to perform well at 650-800°C. The results show that annealing improves interface bonding between particles in the anode and at the interface between the anode and electrolyte.
The Influence of Temperature Gradient on Thermal Cyclic Lifetime of Plasma-Sprayed Thermal Barrier Coatings
Authors: Dong H. , Yang G.-J. , Ding H. , Li C.-X. , Li C.-J.
Published: June 2023

Thermal cycling tests were performed on thermal barrier coatings (TBCs) to evaluate the influence of temperature gradients in the ceramic topcoat on overall lifetime and performance. The coating system tested consists of an Inconel 738 substrate, a cold-sprayed NiCoCrAlTaY bond coat, and an atmospheric plasma sprayed YSZ topcoat. YSZ surface temperatures were 1150, 1200, and 1250 °C, corresponding to temperature gradients of 150, 200, and 250 °C across the 250 µm thick layer. Heating and cooling times were set at 120 sec for each thermal cycle. The results of the study show that lifetime decreases with increasing temperature gradient, although the gradient has little effect on the failure mode.
Influence of Cr3C2-NiCr Feedstock Powder Characteristics on Deposition Efficiency, Coating Microstructure, and Abrasion Wear Resistance
Authors: Berger L.-M. , Thiele S. , Börner T. , Janka L. , Rodriguez Ripoll M.
Published: June 2023

This work assesses the influence of powder characteristics on the deposition efficiency, microstructure, and tribological properties of Cr3C2-NiCr coatings. Four commercial powders prepared by different methods were used for the study. All have a spherical morphology but vary in terms of porosity, carbide grain size, and flowability. The feedstocks were deposited on flat low-carbon steel substrates using a liquid-fueled HVOF torch mounted on an industrial robot. Deposition efficiency was measured along with coating hardness, Young’s modulus, and abrasive wear resistance. In addition, some of the coatings were heat treated and changes in microstructure and hardness were recorded.
Heat-Treatment of Cold Sprayed Al/Ti Coating on γ-TiAl Alloy
Authors: Wang J. , Kong L. , Li T. , Xiong T.
Published: June 2023

Aluminum-titanium powder mixtures were deposited on γ-TiAl alloy substrates by cold spraying then heat treated for 5 h at 600, 650, and 700 °C. SEM and XRD examination showed that the treatment caused Al to diffuse into the substrate where it reacted with Ti, resulting in changes in microstructure. The diffusion of Al left pores in the fringes of the TiAl3 phase, increasing the porosity of the coatings. A surplus of Al remained in the coatings after heat treatment at 600-650 °C, but at 700 °C, all Al was consumed, contributing to the formation of a continuous TiAl3 layer.
Formation of Secondary Phases in Tunnel Plasma Sprayed Metallic Glass Coatings and Their Role on Properties
Authors: Yugeswaran S. , Kobayshi A. , Coyle T. W. , Mostaghimi J.
Published: June 2023

In this work, tunnel plasma spraying is used to produce Cu36Zr48Al8Ag8 metallic glass coatings on stainless steel. The results show that cooling gas flow rates play a vital role in oxidation and the formation of intermetallic phases in coating microstructures. Phase formation and microstructural features were evaluated by XRD and SEM-EDX analysis. Coating properties including hardness, sliding wear, and corrosion resistance were measured and the results are compared with the presence of secondary phases. It is shown that an increase in secondary phases improves sliding wear resistance but reduces resistance to corrosion.
Comparison of Metastable Austenite Type Structure of Fe-Based Coatings Produced by Arc Spraying and Surfacing
Authors: Korobov Yu. , Filippov M. , Makarov A. , Zabolotski I. , Khudorozhkova Yu. , Rimer G.
Published: June 2023

A comparative study was done on the structure and tribological properties of arc sprayed coatings and arc surfaced layers of TRIP steel. An iron alloy feedstock was used due to its ability to form a metastable austenite structure in both sprayed and surfaced layers that can be transformed to hard martensite by an applied external load. Microstructural and phase analysis and adhesive and abrasive wear tests were conducted to evaluate the coatings and surfaced layers. Differences in properties are explained based on input energy parameters.
Fatigue Performance of TBC on Structural Steel Exposed to Cyclic Bending
Authors: Musalek R. , Kovarik O. , Medricky J. , Curry N. , Bjorklund S. , Nylen P.
Published: June 2023

The fatigue performance of conventional structural steel with an applied thermal barrier coating (TBC) was evaluated via cyclic bending. Tests were carried out for as-received and grit-blasted substrates as well as for samples with thermally sprayed bond coats and topcoats. Failure mechanisms were identified and changes in fatigue resistance were assessed based on results obtained for different loading amplitudes supplemented by fractographic analysis.
X-Ray Micro-Tomography and Modeling of Cold-Sprayed Coated Powders
Authors: Delloro F. , Faessel M. , Proudhon H. , Jeulin D. , Jeandin M. , Meillot E. , Bianchi L.
Published: June 2023

In the present study, X-ray microtomography is used to examine cold-sprayed tantalum splats on copper substrates. To resolve tantalum splats intermeshed with other splats of the same chemical composition, a contrasting medium of some sort is required. For this purpose, the feedstock powder is coated with an iron layer by means of fluidized-bed chemical vapor deposition. Experimental tests were coupled with finite element simulations to determine how stresses generated during the impact of a spherical iron-coated particle affect the integrity of the added contrasting layer.
Properties of High Thickness Al Coatings Obtained by Cold Gas Spray to Repair Light Alloy Components
Authors: Bedoya J. , Dosta S. , Cano I. G. , Guilemany J. M.
Published: June 2023

In this work, Al and Al-Al2O3 coatings up to 8 mm thick were cold sprayed on AZ91D magnesium alloy substrates. Microstructure, microhardness, bond strength, and corrosion and wear resistance were studied to assess the viability of using these coatings to restore dimensionally degraded parts and protect them from further corrosion and wear.
A Plasma Torch Designed for Low Pressure Plasma Spraying and Formation of Yttria Stabilized Zirconia Coatings
Authors: Sun C. Q. , Gao Y. , Yang D. M.
Published: June 2023

This study investigates the spraying characteristics of low-pressure plasma torches with different nozzle sizes. YSZ feedstock powders were sprayed with each torch at different stand-off distances and gas pressures. The plasma jets created were photographed and measured, showing that low-pressure spraying significantly increases plume length and diameter compared to atmospheric conditions. The coatings obtained were examined and microhardness was determined. It was found that the longer nozzle increases the temperature of the plasma jet, and with a longer dwell time, the particles heat more efficiently and evaporate more fully. At a spraying distance of 300 mm, the coatings were mostly composed of equiaxed grains, which were much larger in the coatings produced with the long anode nozzle. At longer spraying distances, more unmelted particles appeared in the coatings, leading to a reduction in hardness.
La comunicaciÃ³n acadÃ©mica y sus descontentos
Authors: Codina LluÃ­s
Published: June 2023

RevisiÃ³n de las caracterÃ­sticas esenciales de la comunicaciÃ³n acadÃ©mica y examen de las principales crÃ­ticas al sistema de evaluaciÃ³n de la ciencia basada en publicaciones. Se examinan de modo crÃ­tico expresiones como â€œpresiÃ³n por publicarâ€ o â€œperish or publish!â€, y se argumenta que tales encuadres no corresponden a un estado de cosas identificable en el caso de la ciencia y la universidad espaÃ±olas. Se hace tambiÃ©n una revisiÃ³n de los motivos por este descontento y se sitÃºa en la existencia de un grupo reducido de editoriales de gran peso econÃ³mico y que al parecer trabaja con mÃ¡rgenes de beneficio excesivos.
التضامن الاستراتيجي في معركة سيف القدس
Authors: AL ASTAL Sami
Published: June 2023

في ظل ارتكاب جرائم الحرب، الانتهاكات المتكررة للقانون الدولي الإنساني، ورفض تطبيق القرارات الأممية والدولية، وفوق كل ما سبق يتمتع الاحتلال الصهيوني بدعم مستمر وحصانة استراتيجية توفرها الدول الغربية بقيادة الولايات المتحدة الامريكية؛ ومع دوام حالة الإفلات من العقاب؛ يقوم الاحتلال "الاسرائيلي" متى شاء بضرب أي منطقة فلسطينية وفق سياسات الفصل العنصري وتهويد المسجد الأقصى ومدينة القدس؛ بل قطع أمل دعاة السلام من خلال انهاء حل الدولتين وخلق حالة حصار في مدن الضفة الغربية مشابهة لقطاع غزة. أمام هذا الواقع يقوم البحث بتسليط الضوء على الزخم الشعبي الفلسطيني والعربي والإسلامي والدولي الذي التف وتضامن مع الشعب الفلسطيني في معركة سيف القدس 2021، وينبه البحث الى أن الشعوب هي أكبر استراتيجية حقيقية لتوفير الحماية الدولية في مواجهة العدوان.
الأداء السياسي لحركة حماس خلال معركة سيف القدس في مايو 2021
Authors: ALSHİEKH KHALEEL Nihad
Published: June 2023

تناول هذا البحث موضوع الأداء السياسي لحركة حماس خلال معركة سيف القدس التي وقعت في مايو 2021، وشملت ثلاثة محاور رئيسية هي: الأداء السياسي لحركة حماس خلال معركة سيف القدس، ومساهمة حركة حماس في التوصل إلى التهدئة في نهاية المعركة، إضافة إلى مساهمة حماس السياسية بُعيد انتهاء المعركة. واتبعت الدراسة منهج البحث التاريخي، وركزت بشكل أساسي على تحليل نصوص تصريحات قيادات حركة حماس خلال المعركة، إضافة إلى تحليل نصوص المقالات التي كتبها أصدقاء وخصوم وأعداء حركة حماس. وخلصت الدراسة إلى مجموعة من النتائج أهمها يتمثل في: حاولت حركة حماس تثوير الساحات الفلسطينية المختلفة لصالح إبراز القضايا الوطنية العامة وعلى رأسها القدس، وهمّشت حركة حماس مطالبها الخاصة بفك الحصار المفروض على قطاع غزة خلال مفاوضات التهدئة التي توسط فيها النظام المصري بشكل رئيسي، كما اعتبرت حركة حماس بُعيد المعركة أن ما بعد المعركة مختلف عما قبلها وتبنت بوضوح موضوع إعادة بناء النظام السياسي الفلسطيني كحركة تحرر وطني وليس كمشروع تسوية مع الاحتلال، وركزت حركة حماس على توجيه ضربة لاعتراف الأمريكان بالقدس عاصمة لإسرائيل، وأظهرت أن سيطرة الاحتلال الإسرائيلي على القدس هو موضع شك، وفوق هذا كله عاد الموضوع الفلسطيني لكي يصبح هو جوهر الصراع.
Медициналық сақтандыру жүйесінде деректерді өндіру әдістерін практикалық қолдану
Authors: Гелашвили Н.Н. , Сабыржан А. , Раимбеков Б.Х. , Кенешева Ғ.Ә. , Абдраманова Г.Қ.
Published: June 2023

Қазірші кезеңде ақпарат компанияның іскерлік қызметінің сәттілігінің маңызды факторына айналды. Компанияның бәсекегеқабілеттілік деңгейі оның болуына, сапасына және мерзіміне тығыз байланысты. Сонымен қатар, бүгінде келіп түскен ақпараттың саны өте көп және оны тиімді өңдеу қажеттілігі туындайды.

Зерттеудің мақсаты болашақ денсаулық сақтандыру төлемдерін болжау үшін Data Mining құралын пайдаланып ақпаратты өңдеудің математикалық әдістерін қолдану болып табылады.

Әдісі: Болашақ сақтандыру төлемдерінің мөлшерін болжау және сақтандыру жағдайларының пайда болу факторларын анықтау үшін сызықтық және көпмүшелік регрессия әдістері таңдалған. Алгоритмдер көрсеткішінің негізгі факторлары ретінде: клиенттердің жынысы мен жасы, темекі шегу әдетінің болуы, дене салмағының бойға қатынасы, тұрғылықты жері, сақтандыруы бар балалардың болуы, медициналық шығындардың мөлшері және тұрғылықты жері пайдаланылды. Нәтижелер: Жасы мен темекі шегу денсаулыққа қатысты сақтандыру жағдайының деңгейіне үлкен мән береді. Бұл сақтандыру компаниясының клиенттерінің әл-ауқатына ең үлкен теріс әсер етуі мүмкін. Дене салмағының индексі де үлкен мәнге ие. Ең азы денсаулық сапасына тұрғылықты жері мен жасы әсер етеді. Мұның бәрі сақтандыру компаниясының басшылығына сақтандыру өтемақыларын төлеу шығындарын нақты жоспарлауға мүмкіндік береді. Сондай-ақ, сақтандыру жағдайының ықтималдығына әсер ету дәрежесін анықтау сақтандыру компаниясына клиентке келтірілген залалды өтеу тетіктері сипатталатын шарттарды неғұрлым икемді жасауға мүмкіндік береді.

Қорытынды: Data Mining компания қызметін тиімді басқарудың тиімді құралы бола алады. Жұмыста жүргізілген шолу мен салыстырмалы талдау негізінде деректерді интеллектуалды аналитикалық өңдеу процесін ұйымдастырудың қолданыстағы тәсілдері негізінде денсаулыққа зиян бойынша сақтандыру төлемдерінің мөлшерін одан әрі болжау үшін аналитикалық құралдардың критерийлері мен жіктеу жүйесі сыналды.
Marine expeditions to Alta California in the context of great powers rivalry in the first half of the XIX-th century
Authors: Petrov Alexandr
Published: June 2023

The article is devoted to the features of the establishment of European powers in Alta California in the first quarter of the 19th century. The available information about Russian penetration into California and interaction with the Spaniards and US citizens is summarized. This process involved government authorities and private commercial companies. The authors use documents obtained from domestic and foreign archives. The article is written on the basis of an interdisciplinary approach and is conceived as a series of further publications by the authors.
Sectoral Analysis of Capital Structure and Distribution Policies of Companies listed on the JSE
Authors: Freddy Mvita Mpinda , Marx Brummer Leon , Petrus Wolmarans Hendrik
Published: June 2023

Abstract The objective of this paper was to investigate whether companies listed in four sectors of the Johannesburg Stock Exchange (JSE) treated their financing and distribution policies differently and the interdependence thereof because of sectoral nuances. The research employed a single equation (fixed effect) and a simultaneous equation (3SLS) on a sample of twenty three companies from the basic materials sector, nine companies from the consumer goods sector, sixteen companies from the consumer services sector and twenty one companies from the industrial sector over the period 1990-2017. The empirical findings provide evidence that sectoral nuances played an important role in explaining the treatment of financing and distribution decisions across these four sectors of the JSE. The empirical findings revealed that dividend payments and capital structure are positively significantly correlated with each other in the basic materials sector and consumer service sector, while in the consumer goods sector, capital structure and dividend payment are negatively significantly correlated with each other. Furthermore, the results provided evidence of joint determinants affecting the sectors significantly and differently because of sector nuances. Profitability, size, and assets tangibility were the strongest in explaining the effects of joint determinants within the 3SLS approach. The research proposed that South African managers must consider sector differences when formulating and inter-relating financing decisions to payout decisions.
Importancia del comercio electrónico en emprendimientos regionales
Authors: González Criollo Brian Nicolás
Published: June 2023

Debido al avance útil de las Tecnologías de la Información y la Comunicación (TIC) y demás plataformas en el desarrollo de la convergencia digital, el argumento sólido que se desea brindar trata acerca de cómo la era informática, bien empleada, puede generar amplias oportunidades en el mercado laboral y sostener la economía cuando suceden acontecimientos de impacto como la pandemia generada por el COVID-19, donde el comercio electrónico logró ser un elemento útil y eficaz para mantener algunos emprendimientos y potenciar sus servicios.
Emprendimiento: una mirada desde la innovación y la creatividad
Authors: Chaves Escobar Jessica Alejandra
Published: June 2023

El presente artículo se basa en una revisión teórica frente a los procesos de emprendimiento y cómo estos se ven entrelazados con la zona de confort, la creatividad y la innovación, puesto que es importante abarcar diferentes elementos que se ven influenciados dentro de este proceso de emprendimiento, tanto a nivel individual, como familiar y social, permitiéndonos centrarnos en una perspectiva de innovación que pueda llevar a identificar dificultades, buscar soluciones, hacer especulaciones o formular hipótesis, como también, el aprobar y comprobar ciertas ideas.
El trabajo social y sus intervenciones de emprendimiento social
Authors: Guerra Burbano Ana Sisney , Tonguino Meza Catalina
Published: June 2023

Los servicios sociales y los recortes sociales suponen un desafío para la práctica del Trabajo Social. A continuación, se transcribe textualmente lo expresado por Millán-Franco (2020): De esta forma, la situación socioeconómica demanda que los/as trabajadores/ as sociales se integren en los nuevos nichos laborales en un contexto donde el emprendimiento social se sitúa como un incipiente escenario profesional (Raya & Caparrós, 2013: 338). Así, las entidades de servicios sociales, aunque todavía en contadas ocasiones, desarrollan intervenciones de emprendimiento social como soluciones a largo plazo para dar cobertura a necesidades de la comunidad (Nandan & Scott, 2013: 258).
Das Leben des Kölner Magisters Gerhard von Wieringen (1451 bis nach 1501)
Authors: Schwinges Rainer Christoph
Published: June 2023

Dieses Buch handelt von Magister "Gerardus", der 1451 auf der ehemaligen Insel Wieringen in Nordholland geboren wurde. Er war einer von über 70’000 Studenten und Gelehrten, die mit ihren Studien- und Lebenswegen Aufnahme in das Repertorium Academicum Germanicum (rag-online.org) gefunden haben. Aber nur wenige von ihnen haben ein Selbstzeugnis hinterlassen, ein Notiz- und Rechnungsbuch, das für die Zeit von 1464 bis 1501 von Spuren gelehrter Bildung und einem nuancenreichen Leben kündet. Gerhard von Wieringen war wie viele seiner Landsleute, denen in diesem Buch erstmals Beachtung geschenkt wird, ein Absolvent der Kölner Universität, hatte es zu akademischen Ehren und danach dank vor allem seiner gelehrten Onkel zu einer auskömmlichen geistlichen Tätigkeit in der rheinischen Stadt Jülich gebracht. Sein Buch, geschrieben in lateinischer Sprache, durchsetzt von niederländischen und rheinischen Wörtern, wird zusammen mit einer deutschen Übersetzung ediert (Teil II) und dessen Inhalt (Teil I) einordnend kommentiert. Es handelt sich um private Aufzeichnungen, die gleichwohl etwas zur Geschichte Wieringens, der Kölner Universität sowie der Stadt Jülich in der zweiten Hälfte des 15. Jahrhunderts beitragen. Zentrales Thema ist sein "Lebenswerk", die Übernahme und Reparatur des Jülicher Stationshauses der Karmeliten. Dazu finden sich Notizen über Bau- und Waldarbeiter, Handwerker, Gehilfen, Mägde, Boten und Botinnen, über Essen und Trinken, Geben und Nehmen von Geschenken sowie über Erfahrungen, die er mit Vernetzungen gemacht hat, mit einem trotz auch kritischer Begegnungen gut funktionierenden Freundes- und Bekanntenkreis. Im Anhang (Teil III) stösst man u.a. auf Familienmitglieder, auf Wieringer an Universitäten (1389–1524) sowie auf Karten und Fotographien.
Lower Cerebrospinal Fluid Amyloid-β42 Predicts Sooner Time to Antipsychotic Use in Alzheimer’s Disease
Authors: Cahan Joshua G. , Vassar Robert , Bonakdarpour Borna
Published: June 2023

Background:

Cerebrospinal fluid (CSF) biomarkers of amyloid-β42 (Aβ42) and phosphorylated-tau help clinicians accurately diagnose Alzheimer’s disease (AD). Whether biomarkers help prognosticate behavioral and psychological symptoms of dementia (BPSD) is unclear.

Objective:

Determine whether CSF biomarker levels aid prognostication of BPSD in AD.

Methods:

This retrospective cohort study included patients over 65 with a diagnosis of AD based on CSF biomarkers. We measured time from CSF testing to the first antipsychotic use in the following months. We then analyzed time to antipsychotic (AP) use with respect to Aβ42, total tau, phosphorylated tau, and amyloid-to-tau index using a survival analysis approach.

Results:

Of 86 AD patients (average 72±5 years, 46.5% male), 11 patients (12.7%) received APs following CSF testing. Patients with Aβ42 below the median had sooner time-to-AP use. This was significant on a log-rank test ( p = 0.04). There was no difference in time-to-AP use if the group was stratified by levels of total tau, phosphorylated tau, or amyloid-to-tau index.

Conclusion:

These results suggest a relationship between lower CSF Aβ42 levels and sooner AP use. This supports prior reports suggesting a correlation between BPSD and Aβ deposition on PET. These results highlight the need for further prospective studies on Aβ levels and BPSD.
Benefits of a 12-Week Non-Drug “Brain Fitness Program” for Patients with Attention-Deficit/Hyperactive Disorder, Post-Concussion Syndrome, or Memory Loss
Authors: Fotuhi Majid , Khorrami Noah D. , Raji Cyrus A.
Published: June 2023

Background:

Non-pharmacologic interventions can potentially improve cognitive function, sleep, and/or mood in patients with attention-deficit/hyperactive disorder (ADHD), post-concussion syndrome (PCS), or memory loss.

Objective:

We evaluated the benefits of a brain rehabilitation program in an outpatient neurology practice that consists of targeted cognitive training, lifestyle coaching, and electroencephalography (EEG)-based neurofeedback, twice weekly (90 minutes each), for 12 weeks.

Methods:

223 child and adult patients were included: 71 patients with ADHD, 88 with PCS, and 64 with memory loss (mild cognitive impairment or subjective cognitive decline). Patients underwent a complete neurocognitive evaluation, including tests for Verbal Memory, Complex Attention, Processing Speed, Executive Functioning, and Neurocognition Index. They completed questionnaires about sleep, mood, diet, exercise, anxiety levels, and depression—as well as underwent quantitative EEG—at the beginning and the end of the program.

Results:

Pre-post test score comparison demonstrated that all patient subgroups experienced statistically significant improvements on most measures, especially the PCS subgroup, which experienced significant score improvement on all measures tested ( p≤0.0011; d z≥0.36). After completing the program, 60% to 90% of patients scored higher on cognitive tests and reported having fewer cognitive and emotional symptoms. The largest effect size for pre-post score change was improved executive functioning in all subgroups (ADHD d z= 0.86; PCS d z= 0.83; memory d z= 1.09).

Conclusion:

This study demonstrates that a multimodal brain rehabilitation program can have benefits for patients with ADHD, PCS, or memory loss and supports further clinical trials in this field.
Change management in business organization: A literature review
Authors: Abu Orabi Tareq , Abu Alfalayeh Ghaith , Alhyasat Wael Basheer Abdul Kareem , Ababne Ahmad , Alkhawaldah Reyad , Qteishat Mazen
Published: June 2023

BACKGROUND: The effectiveness of the paper’s bibliometric analysis and systematic assessment of change management research in administrative and technological studies may open the way for more study in this field. This study may be the first of its type, and its findings will be useful to other academics working in the subject of change management. OBJECTIVE: The goal of this literature study is to identify essential ideas that might influence change management and to lay the groundwork for future research in change management that uses bibliometric analysis. The evaluation determines the most important and frequently used terms connected with change management. METHODS: The method used in this study is a systematic review of change management publications from Web of Science. RESULTS: The most often used terms in change management research, according to the survey, were Leadership, Organizational Change, Organizational Development, Organizational Culture, Performance, Innovation, Framework, Technology, and Transformation. Change management papers were mostly published in the United States, China, Pakistan, Germany, Australia, and Finland. IMPLICATIONS: The study’s findings may be used to generate articles on change management in the market discipline, notably in the domains of business and technology.
Predicting the compressive strength of High-performance concrete by using Radial basis function with optimization Improved Grey Wolf optimizer and Dragonfly algorithm
Authors: Zhao Jin , Shi Liying
Published: June 2023

This paper uses two optimizers (Improved Gray Wolf Optimizer (I_GWO) and Dragonfly Optimization Algorithm (DA)) for the sensitivity and robustness of artificial intelligence (AI) techniques, namely radial basis functions (RBFs). The purpose is to evaluate and analyze the predictive strength of high-performance concrete (HPC). 170 samples were collected for this purpose. This includes eight input parameters, cement, silica fume, fly ash, water, coarse aggregate, total aggregate, high water reducing agent, concrete age, and one output parameter, the compressive strength, to produce Increase learning and validation data sets. The proposed AI model was validated against several standard criteria: coefficient of determination (R2), root mean square error (RMSE), scatter index (SI), RMSE-observations standard deviation ratio (RSR), and coefficient of persistence (CP), n10_index. Many runs were performed to analyze the sensitivity and robustness of the model. The results show that I_GWO using RBF performs better than DA. Furthermore, sensitivity analysis indicated that cement content and HPC test age are the most essential and sensitive factors for predicting the compressive strength of HPC, according to the evaluations performed on the models, it was seen that the IGWO_RBF model provided better results compared to other models and can be introduced as the practical model for the prediction of HPC’s CS. In conclusion, this study can help to select appropriate AI models and suitable input parameters to accurately and quickly estimate the compressive strength of HPC.
E-commerce brand authenticity perception model of territorial characteristic agricultural products based on fuzzy cognitive map and emotional analysis
Authors: Sun Yanling , Liu Xiaojing , Chen Haoyue , Zhu Li , Li Yingji
Published: June 2023

Brand authenticity perception is essential for territorial characteristic agricultural product e-commerce studies. From the complexity of consumer perception of brand authenticity, an e-commerce brand authenticity perception (EBAP) analysis model is proposed based on fuzzy cognitive map (FCM) and emotional analysis of online comments. Firstly, LDA model and snowNLP tools extract consumer perception attributes and their emotional inclination. After that, FCM and improved Bonferroni mean (BM) operator are used to accurately analyze the interrelationships between different attributes and comprehensively evaluate the brand authenticity of different enterprises under the same characteristic agricultural product. Finally, the model comparison experiment results show that the model proposed can reflect the “attribute importance” and “emotional inclination” of the e-commerce brand authenticity perception of territorial characteristic agricultural products. Among them, “platform logistics” and “product benefits” are essential in promoting the authenticity of brand-consumer relationships. Meanwhile, “e-commerce aftersales service” is closely related to the positive evaluation of “platform logistics” and “product benefits.” This study expands the methodical approach to brand authenticity perception research; it provides a valuable reference for developing modern fine granularity management of e-commerce brand authenticity for characteristic agricultural products.
The ascent of network traffic classification in the dark net: A survey
Authors: Jenefa A. , Edward Naveen V.
Published: June 2023

The Darknet is a section of the internet that is encrypted and untraceable, making it a popular location for illicit and illegal activities. However, the anonymity and encryption provided by the network also make identifying and classifying network traffic significantly more difficult. The objective of this study was to provide a comprehensive review of the latest advancements in methods used for classifying darknet network traffic. The authors explored various techniques and methods used to classify traffic, along with the challenges and limitations faced by researchers and practitioners in this field. The study found that current methods for traffic classification in the Darknet have an average classification error rate of around 20%, due to the high level of anonymity and encryption present in the Darknet, which makes it difficult to extract features for classification. The authors analysed several quantitative values, including accuracy rates ranging from 60% to 97%, simplicity of execution ranging from 1 to 9 steps, real-time implementation ranging from less than 1 second to over 60 seconds, unknown traffic identification ranging from 30% to 95%, encrypted traffic classification ranging from 30% to 95%, and time and space complexity ranging from O(1) to O(2n). The study examined various approaches used to classify traffic in the Darknet, including machine learning, deep learning, and hybrid methods. The authors found that deep learning algorithms were effective in accurately classifying traffic on the Darknet, but the lack of labelled data and the dynamic nature of the Darknet limited their use. Despite these challenges, the study concluded that proper traffic classification is crucial for identifying malicious activity and improving the security of the Darknet. Overall, the study suggests that, although significant challenges remain, there is potential for further development and improvement of network traffic classification in the Darknet.
RETRACTED: Implicit sentiment analysis based on affective knowledge and event information
Authors: Chang Jingjing , Zhao Hui
Published: June 2023

This article has been retracted. A retraction notice can be found at https://doi.org/10.3233/JIFS-219433.
Hybrid Optimized Verification Methodology using Deep Reinforcement Neural Network
Authors: Bhuvaneswary N. , Deny J. , Lakshmi A.
Published: June 2023

Universal Verification Methodology (UVM) caters to an essential role in verifying the different categories of circuits ranging from small-scale chips to complex system-on-chip architectures. Constrained random simulations are an indispensable part of UVM and are often used for design verification. However, the effort and time spent manually updating and analyzing the design input constraints result in high time complexity, which typically impacts the coverage goal and fault verification ratio. To overcome this problem, this paper proposes a novel hybrid optimized verification framework that combines Reinforcement Learning (RL) and Deep Neural Networks (DNN) for automatically optimizing the input constraints, accelerating faster verification with a high coverage ratio. The proposed algorithm uses reinforcement learning to generate all possible vector sequences needed for testing the target devices and corresponding outputs of the target devices and potential design errors. Furthermore, the framework intends to use high-speed deep-feedforward neural networks to automate and optimize the constraints during runtime. The proposed framework was developed using Python interfaced with the TCL environment. Extensive experimentation was carried out using several circuits, including multi-core designs, and performance parameters such as coverage accuracy, speed, and computational complexity were calculated and analyzed. The experiment demonstrated the proposed framework remarkable results, showing its superior performance in faster coverage and fewer misclassification errors. Furthermore, the proposed framework is compared with existing verification frameworks and other classical learning models. Good results demonstrate that the proposed framework increases the 4.5x speed for verifying multi-core designs and the 99% accuracy of detection and coverage.
Magnitude, variability and symmetry in head acceleration and jerk and their relationship to cervical and ocular vestibular evoked myogenic potentials
Authors: Govender Sendhil , Biswas Raaj Kishore , Welgampola Miriam S. , Rosengren Sally M.
Published: June 2023

BACKGROUND: Acceleration and changes in acceleration (jerk) stimulate vestibular otolith afferents. Bone-conducted (BC) vibration applied to the skull accelerates the head and produces short latency reflexes termed vestibular evoked myogenic potentials (VEMPs). OBJECTIVE: To determine the magnitude, variability and symmetry in head acceleration/jerk during VEMP recordings and investigate the relationship between head acceleration/jerk and VEMP properties. METHODS: 3D head accelerometery (sagittal, interaural and vertical axes) was recorded bilaterally in thirty-two healthy subjects during cervical (cVEMP) and ocular (oVEMP) recordings. BC 500 Hz sinusoidal tones were applied to the midline forehead using a positive polarity stimulus. RESULTS: The direction of induced acceleration/jerk was predominately backward, outward and downward on either side of the head during cVEMP and oVEMP recordings. Overall, acceleration/jerk was larger in the sagittal and interaural axes and peaked earlier in the interaural axis bilaterally. Acceleration was more symmetric in the sagittal and interaural axes whereas jerk symmetry did not differ between axes. Regression models did not show a systematic relationship between acceleration/jerk and either VEMP reflex. CONCLUSIONS: The pattern of skull acceleration/jerk was relatively consistent between the two sides of the head and across subjects, but there were differences in magnitude, leading to inter-side and inter-subject variability.
Can Central Bank Credibility Improve Monetary Policy? A Meta-Analysis
Authors: Cepeda Valentina , Taboada-Arango Bibiana , Villamizar-Villegas Mauricio
Published: June 2023

We bring together the largest meta-analysis ever conducted in the macroeconomic literature to investigate the effects of central bank credibility on monetary policy. With nearly 1,200 surveyed effects, we first confirm that: (i) conventional policy significantly affects inflation and output, and (ii) unconventional policy significantly affects capital flows and the exchange rate. We next evaluate if different measures of credibility amplify these effects. Our findings indicate that central bank transparency has the largest payoff, as it increases policy effectiveness by 69% when dealing with foreign exchange intervention, by 59% when dealing with capital inflows, and by 14% when dealing with conventional policy. An alternative measure, medium and long-term anchoring in inflation expectations, is the runner up, increasing effectiveness by 31%, 9%, and 10%, respectively. Other measures, such as central bank independence and short-term anchoring in inflation expectations have lower and in some cases null effects.
A Hybrid Software Defects Prediction Model for Imbalance Datasets Using Machine Learning Techniques: (S-SVM Model)
Authors: Mustaqeem Mohd. , Siddiqui Tamanna
Published: June 2023

Software defect prediction (SDP) is an essential task for developing quality software, and various models have been developed for this purpose. However, the imbalanced nature of software defect datasets has challenged these models, resulting in decreased performance. To address this challenge, the author has proposed a hybrid machine learning model that combines Synthetic Minority Oversampling Technique (SMOTE) with Support Vector Machine (SVM)—SMOTE-SVM (S-SVM) model. The author has empirically examined SDP using multiple datasets (CM1, PC1, JM1, PC3, KC1, EQ and JDT) from the PROMISE and AEEEM repositories. The experimental study indicates that the S-SVM model involved training and compared with previously developed balanced and imbalanced test datasets using four evaluation metrics: Precision, Recall, F1 score, and Accuracy. For the balanced dataset, the S-SVM model achieved precision values ranging from 70 to 96, recall values ranging from 52 to 94, F1-score values ranging from 67 to 90, and accuracy values ranging from 69 to 98. For the imbalanced dataset, the S-SVM model achieved precision values ranging from 60 to 93, recall values ranging from 64 to 97, F1-score values ranging from 69 to 91, and accuracy values ranging from 67 to 87. The proposed S-SVM model outperforms other models’ ability to classify and predict software defects. Therefore, the hybridisation of SMOTE and SVM improved the model’s ability to categories and predict balanced and imbalanced datasets when sufficient defective and non-defective data is provided.
Dor e Câncer
Authors: Gouveia Filho Jayme José , Gadelha Maria Inez Pordeus
Published: June 2023

O presente trabalho tem como objetivo revisar alguns aspectos relativos à dor de origem neoplásica. Os autores enfatizam a importância do diagnóstico da causa da dor para a aplicação da terapêutica adequada e apresentam os medicamentos que podem ser utilizados, isoladamente ou em combinações, evidenciando que o conhecimento das bases farmacológicas da terapêutica é necessário para a prescrição correta dos analgésicos e medicamentos coadjuvantes.
Carcinoma de uretra feminina
Authors: Pioner Giovani T. , Busato Jr. Wilson F.S. , Barcelos Filho Mariano , Rós Carlos T. da , Lisboa José F. , Souto Carlos A. V.
Published: June 2023

O câncer da uretra feminina é uma patologia rara, com maior incidência em mulheres acima dos 50 anos. O prognóstico é diretamente relacionado com a localização do tumor e o tratamento compreende a remoção cirúrgica com ou sem radioterapia associada. Relatamos um caso de carcinoma epidermóide de uretra em uma mulher de 58 anos, tratado com uretrectomia total complementada, um ano após, com um procedimento de derivação urinária continente.
Experiência em 12 casos de melanoma com anticorpos monoclonais
Authors: Silva Amaury Barbosa da , Calegaro José Ulisses M. , Marcelino Nivaldo , Gomes Ênio de Freitas , Carvalho Antonio Carlos Macedo de , Pinheiro Ely dos Santos
Published: June 2023

Os autores apresentam o resultado do estudo cíntilográ fico em 12 pacientes com melanoma. Os 12 pacientes, oito do sexo masculino, sendo nove leucodermos e três faiodermos, com idade média de 51,5 anos, portadores de melanoma em localizações variáveis, foram divididos em dois grupos: Grupo / - cinco casos, para estadiamento; Grupo II- sete casos, para proservação. O estudo cintilográfico foi realizado 2, 6, 10 e 24 horas após injeção endovenosa de 50 mCi (1850 mBq) de 99mTC marcando anticorpos monoclonais antimelanoma (Tecnemab da Sorin). Os exames foram úteis na localização de lesões de pele (5x), linfonodos (4x); ocular, cerebral e tecidos moles uma vez cada, independente da finalidade do estudo (estadiamento ou proservação). Permitiu as seguintes conclusões: 1 - pequenos gradientes de concentração devem ser valorizados; 2 - é necessário o estudo de corpo inteiro sistema ticamente; 3 - a rotina deve empregar um estudo precoce (2-4 horas) e um tardio (12-24 horas); 4 - há limitações na detecção de metástases pulmonares.
Detecção do câncer de mama: atualização e recomendações
Authors: Lopes Emilia Rebelo , Abreu Evaldo De , Gadelha Maria Inês Pordeus
Published: June 2023

Este artigo apresenta um panorama das atualizações e recomendações para detecção do câncer de mama. O câncer de mama é uma das causas de morte mais importantes nas mulheres dos países ocidentais. As estatísticas de mortalidade e de morbidade mostram o aumento de sua freqüência, tanto nos países desenvolvidos quanto naqueles em desenvolvimento.
Corak dan Penafsiran Ayat Mawaris dalam Kitab Tafsir Marah Labid Karya Syekh Nawawi Al-Bantani
Authors: Tri Oktafia .Z Zeti Isra
Published: June 2023

This article discusses the verses of the Qur'an, which is one of the efforts to understand the existing studies. Discussing the right of inheritance where this right of inheritance becomes inheritance property for heirs, the division of inheritance is the division of inheritance when someone has died, who gets the right of inheritance is that there are criteria for each reason what has been explained in the Quran and legal requirements in Islam, the division of property that gets is certain people such as parents,  The side of the father, the side of the mother and many more criteria that get and become heirs. and whoever gets the inheritance, this is already explained in the Qur'an in surah An-nisa in verses 11-12 and in verse 176 which is interpreted in the book of tafsir Marah Labid. Written by Sheikh Nawawi Al-Banthani. And the interpretation of the book of Marah Labid uses the method of interpretation of tahlili and ijmali and is patterned interpretation.