Academia.edu no longer supports Internet Explorer.
To browse Academia.edu and the wider internet faster and more securely, please take a few seconds to upgrade your browser.
2016, International Journal of Engineering Technology and Sciences
High-quality products and shorten manufacturing lead time are very important factors addressed by many companies. Typically, low-quality products are induced by inconsistent of manufacturing process performance. To get a constant laser power in Infrared (IR) Laser Marking process was a common problem facing by many engineers in the manufacturing industry. This consequences might effect on laser marking characteristics such as the possibility of burn marking or blur marking particularly on the products. Therefore, the objective of this paper is to study the interaction between Infrared (IR) Laser Marking input parameters such as current (amp), frequency (Hz), water flow (l/min) and laser beam size (mm) on laser power (watt) as the main response. Furthermore, the response of laser power from Infra-Red laser process can be predicted when all combinations of parameters are tested. The IR marking machine was deployed and experimental studies were conducted in order to meet this objective...
2013 •
This article covers the results of several numerical experiments carried out with specic software working under MATLAB for marking of tool steel and electronic elements. CuBr and Nd:YAG lasers were used in this study. Simulations with 3 dierent durations of pulse of laser radiation were achieved. Numerical calculations were performed with values (for laser sources and technological parameters) based on real experiments.
International Journal of Materials and Product Technology
Analysis on the characteristics of Nd:YAG laser marking on alumina ceramic based on RSM2013 •
Contemporary Materials
Investigating the Influence of the Number of Repetitions and Volumetric Energy Density on Laser Marking of Products2014 •
The basic factors affecting the laser marking of products – volumetric density of the absorbed energy and the number of repetitions, were studied. Experiments were conducted of marking the samples of stainless steel with fiber laser. The dependence of the contrast of marking from the power density for different number of repetitions, and also the volumetric density of the absorbed energy from speed was obtained and the experimental results analyzed.
Contemporary Materials
DETERMINATION OF WORKING INTERVALS OF POWER DENSITY FOR LASER MARKING OF 50ChN STEEL2015 •
Studies relate to two basic methods of steel marking − by melting and by evaporation. Based on theoretical considerations, preliminary intervals of power density for laser marking of 50 ChN steel are determined. Experiments are carried out with fiber laser, operating in the near infrared area. Graphics on the dependence of contrast of marking from the power density of laser radiation for two methods of marking were developed. Working intervals of the power density for marking by melting and by evaporation for visual perception of marking and using the readers were defined.
2013 •
Special consideration is given to parameters affecting the contrast of laser marking on tool steel products and relevant experimental results are reported related to determining the critical density of laser radiation power in melting and evaporation of steel types У7 and Р6М5. The dependence of contrast on marking speed and power density is also presented.
Journal of manufacturing and materials processing
Characterisation of Laser System Power Draws in Materials Processing2020 •
ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference
Investigation of the Influence of Technological Parameters of Laser Marking on the Degree of ContrastIn modern production, each finished product entering the market is identified by a special marking. Each mark must meet requirements such as good coding, easy to see, easy to read by certain readers, stable over time, etc. In the present casting, laser marking of the C75 steel was carried out with a fiber laser with an average power of P = 30 W and a wavelength of λ = 1064 nm. For semi-contrast marking, marking speeds from 100 mm/s to 700 mm/s, average power from 10 to 30 W, raster pitch from 20 µm to 60 µm, scanning frequency from 20 kHz to 150 kHz were investigated as constant parameters are the pulse duration τ =100 ns, number of repetitions N = 1 and defocus Δ f = 0 mm. The influence of the changing parameters on the contrast was established, and experimental dependences were constructed. The achieved research results show that to obtain a high contrast mark, the average power should be above 20 W, the scanning speed up to 300 mm/s, the scanning frequency up to 50 kHz and the ra...
Spre deosebire de legile fizicii sau teoremele din matematică, principiile contabile nu sunt imuabile. Ele au fost formulate în timp, ca urmare a confirmării utilităţii lor de către practică. Unele principii sunt conforme cu raţionamentul comun, altele introduc o gândire diferită, specifică profesiei de contabil. 2.1. Principii contabile Entităţile contabile sunt diferite ca mărime: de la micul comerciant de produse industriale din Piaţa Obor, societatea civilă (cabinetul) de avocatură, diferite societăţi comerciale prezentate mai sus, şi ele de dimensiuni diferite, societăţi bancare şi până la grupurile de societăţi. Situaţiile financiare se întocmesc la nivelul unor entităţi contabile, în mod distinct de persoanele asociate acestor entităţi. Această distincţie este mai uşor de sesizat în cazul societăţilor comerciale, care au dobândit personalitate juridică o dată cu înmatricularea lor la Registrul Comerţului şi în care tranzacţiile desfăşurate de proprietari sunt natural separate de cele ale întreprinderii. Entităţile contabile nu sunt întotdeauna şi entităţi juridice. În cazul unei persoane fizice care are calitatea de comerciant, mica întreprindere nu are personalitate juridică, dar la nivelul acestei afaceri este organizată evidenţa contabilă. Deşi comerciantul este proprietarul afacerii şi, în temeiul acestui fapt, ar putea oricând să ia sume de bani generate din comerţul său pentru nevoile personale, toate sumele de bani preluate trebuie înregistrate în contabilitatea afacerii printr-o reducere a numerarului. Este importantă distincţia dintre abordarea contabilă şi cea juridică: un furnizor al unei asemenea întreprinderi se poate adresa justiţiei pentru recuperarea creanţei sale faţă de aceasta, iar în cazul în care obţine un titlu executoriu, acesta va fi opozabil întregii averi a persoanei care are calitatea de comerciant. Entitatea contabilă poate exista şi la un nivel superior faţă de entităţile juridice. Atunci când o societate comercialăcòntrolează o altă societate comercială (de obicei prin deţinerea majorităţii acţiunilor cu drept de vot), cele două societăţi formează un grup. Grupul este o entitate distinctă din punct de vedere economic, dar nu are personalitate juridică. Fiecare dintre cele două societăţi organizează contabilitatea şi întocmeşte situaţii financiare, dar în plus se realizează şi un set de situaţii financiare ale grupului (consolidate). Entitatea
Bagni di Petriolo. Restauro e valorizzazione, vol. 3
Conservare e valorizzare i frammenti della memoria. Un diverso approccio della conservazione partecipata nel sistema architettura-paesaggio, A. Paolella, a cura di, Bagni di Petriolo. Restauro e valorizzazione, vol. 3, Edifir-edizioni: Firenze 2023, pp. 239-255.Stanislavski Studies
Konstantin Stanislavski and Michael Chekhov: tracing the two practitioners’ “lures” for emotional activation2020 •
Tecnología e infraestructuras productivas en los espacios interiores de la Corona de Aragón (Siglos XIV-XVI), G. Navarro y C. Villanueva (coords.), Murcia 2023, pp. 321-343
Cera y sebo. Recursos naturales para la luz artificial entre España e Italia: iconografía, materialidad y escrituras (siglos XIV-XVI)2008 •
Pope Francis’s Synod on Synodality and Modern Sociology: Exploring Behavioral and Research Aspects
Resolving Moral Issues and Research Networks for Synodality2024 •
European Journal of Human Genetics
Genes predict village of origin in rural Europe2010 •
2024 •
2017 •
Nephrology Dialysis Transplantation
MP452COMPLICATIONS of Therapeutic Plasma Exchange; 33 Years of Single Center Experience2016 •
2007 •
Análisis Poemas de Vanguardia. Vida y Cenizas. Alejandra Pizarnik
Tendencias Poéticas en la Modernidad y Posmodernidad Hispánicas Transoceánicas Análisis Poemas de Vanguardia2024 •