Gotowe bibliografie tematyczne / PVD

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Gotowa bibliografia na temat „PVD”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 8 czerwca 2024

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Artykuły w czasopismach na temat "PVD"

Hidayah, Meylani Nurul, Hary Christady Hardiyatmo i Agus Darmawan Adi. "Study Of Various Types Of Pvd And Ph.D. Joints On Vertical Drainage Performance". Jurnal Indonesia Sosial Teknologi 4, nr 10 (25.10.2023): 1694–702. http://dx.doi.org/10.59141/jist.v4i10.750.

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An important factor for increasing the effectiveness of the PVD (Prefabricated Vertical Drains) is the value of sufficient discharge capacity so that the PVD can work optimally. The use of PVD is usually accompanied by the use of PHD (Prefabricated Horizontal Drains) as horizontal drainage and combined with preloading. In the field, the connection is made by winding the PVD to the PHD and then tying it with cable ties. The connection system can cause deformation at the top of the PVD thereby reducing the effectiveness of the PVD discharge capacity. This study aims to find the optimal PVD-PHD connection system for the discharge capacity which is affected by confinement pressure, overburden pressure, and hydraulic gradient with a PVD-PHD connection system discharge capacity tester. The test specimens used were PVD (5mm thick; 100mm wide) and Ph.D. (20 mm thick; wide: 100 mm, 200mm, and 300mm). 4 types of connection systems have been tried, namely connections A1 and A2 where the PHD is connected in a horizontal position, and connections B1 and B2 where the PHD is connected in a vertical position. Of the four connection systems B1, the connection system has the largest discharge capacity value and a significant increase in PHD width from 100 mm to 300 mm with an increase of 7.694% at 50 kPa overburden pressure and 1.0 hydraulic gradient the highest compared to other connection types

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Gou, Ruyi, Xiaodong Zhang, Chunyu Feng i Xin Wei. "Microstructure and Mechanical Properties Comparative Analysis of TiN Coated on Cemented Carbide". Journal of Computational and Theoretical Nanoscience 14, nr 1 (1.01.2017): 441–47. http://dx.doi.org/10.1166/jctn.2017.6342.

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The cemented carbide of natural gas throttle valve has serious erosion phenomenon in natural gas exploitation. The titanium nitride (TiN) coating on cemented carbide is an effective method to prevent failure of cemented carbide. Three different processes physical vapor deposition (PVD), chemical vapor deposition (CVD) and plasma chemical vapor deposition (PCVD) are used to deposit TiN coating on cemented carbide. The experiments carried on the scanning electron microscopy, the digital micro hardness tester and scratch tester. The results indicate TiN coating deposited by PVD has characteristics of dense structure, uniform thickness, smooth surface. The coating hardness from big to small: PVD > PCVD > CVD. The coating elasticity modulus from big to small: PCVD > CVD > PVD. The bonding force between coating and substrate from big to small: PVD > CVD > PCVD. The results demonstrate that TiN coating deposited by PVD mechanical properties are superior to TiN coating deposited by CVD and PCVD.

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Septian, Septian Fajar Nugraha. "PELAKSANAAN PEMADATAN TANAH PROYEK JALAN TOL (METODE PREFABRICATED VERTICAL DRAIN) AKSES BANDARA INTERNASIONAL JAWA BARAT PAKET 1 ( STA 0+000 – STA 1+850 )". SEMINAR TEKNOLOGI MAJALENGKA (STIMA) 6 (3.11.2022): 22–27. http://dx.doi.org/10.31949/stima.v6i0.747.

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Proyek Jalan Tol Akses Bandara Internasional Jawa Barat merupakan penambahan lingkup Jalan Tol Cipali yang diharapkan akan menghubungkan Kota Bandung dan sekitarnya melalui Jalan Tol Cisumdawu menuju ke Bandara Internasional Jawa Barat di Kertajati. Tujuan dari kerja praktek pada proyek pembangunan Jalan Tol akses Bandara Internasional Jawa Barat adalah memberikan pengalaman visual dan pengenalan bagi mahasiswa tentang suatu kegiatan pembangunan fisik yang nyata dan segala aspeknya yang meliputi aspek kerekayasaan, kontraktual dan administratif serta pelaksanaannya di lapangan, agar mahasiswa mempunyai pengetahuan dan pemahaman atas masalah tersebut. Kedua, mengenal struktur Jalan Tol secara langsung selama masa konstruksi. Ketiga, mengenal tahapan - tahapan metode pelaksaan pekerjaan di Jalan Tol akses Bandara Internasioanl Jawa Barat khususnya pekerjaan soil improvement menggunakan PVD dan PHD. Keempat, mengetahui alat dan material yang digunakan dalam pelaksanaan soil improvement menggunakan PVD dan PHD. Kelima, mengetahui kendala yang mempengaruhi suatu pelaksanaan pekerjaan soil improvement menggunakan PVD dan PHD. Metode PVD dan PHD dimaksudkan untuk mempercepat penurunan dan meningkatkan daya dukung tanah asli yang lunak dengan mengurangi kadar air maupun kadar udara pada butiran tanah sehingga dapat mempercepat penurunan jangka panjang dan perbedaan penurunan (differential settlement). Metode perbaikan tanah lunak dengan menggunakan PVD menghasilkan waktu penurunan yang lebih cepat Karena PVD memiliki permeabilitas lebih besar. Kata kunci: proyek jalan tol, Metode perbaikan tanah, PVD, PHD,

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Yamawaki, Masahiro, Yosuke Honda, Kenji Makino, Takahide Nakano, Yasunori Iida, Fumiaki Yashima, Hiroshi Ueno i in. "Influence of polyvascular disease on clinical outcome in patients undergoing transcatheter aortic valve implantation via transfemoral access". PLOS ONE 16, nr 12 (2.12.2021): e0260385. http://dx.doi.org/10.1371/journal.pone.0260385.

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Background The influence of polyvascular disease (PVD) on the short- and long-term clinical outcomes of patients undergoing transcatheter aortic valve implantation via trans-femoral access (TF-TAVI) has not been fully elucidated. Methods A total of 2167 patients from the Optimized CathEter vAlvular iNtervention-TAVI (OCEAN-TAVI) registry who underwent TF-TAVI was studied. PVD was defined as the presence of at least two of the following vascular bed (VB) diseases: concomitant coronary artery disease (CAD), cerebrovascular disease (CVD), and peripheral artery disease (PAD). Results Patients with PVD (288 patients, 13.3%) had a higher incidence of in-hospital complications, such as AKI (16.3% vs. 7.0%, p<0.01) and disabling stroke (3.5% vs. 1.2%, p<0.01) than patients without PVD. These complications caused higher rates of procedural mortality (4.5% vs. 2.0%, p<0.01). PVD increased the risk of the 2-year rate of cardiovascular death (adjusted hazard ratio [HR], 1.61; 95% confidence interval [CI], 1.04–2.50; p<0.05); however, non-cardiovascular death, myocardial infarction, or ischemic stroke was not associated with PVD. Worsening heart failure (4.6% vs. 1.1%, p<0.01) was the main cause of cardiovascular death among patients with PVD. In a sub-analysis, compared with patients with AS alone, those with 2 VB diseases (CAD+PAD; adjusted HR, 1.93; 95% CI, 1.06–3.53; p<0.05) and 3 VB diseases (CAD+CVD+PAD; adjusted HR, 2.61; 95% CI, 1.21–5.62; p<0.05) had a higher risk of 2-year cardiovascular death. Conclusions The increased prevalence of concomitant atherosclerotic VB diseases before TF-TAVI may increase the rates of in-hospital complications and 2-year cardiovascular death. Given the higher rate of mortality in patients with PVD undergoing TF-TAVI, future studies focusing on medical therapy are needed to reduce long-term cardiovascular events in this high-risk subset.

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Pierre, Clémentine, Audrey Leroy, Adeline Pierache, Laurent Storme, Véronique Debarge, Sandrine Depret, Thameur Rakza, Charles Garabedian i Damien Subtil. "Is vaginal delivery of a fetus in breech presentation at an extremely preterm gestational age associated with an increased risk of neonatal death? A comparative study". PLOS ONE 16, nr 10 (20.10.2021): e0258303. http://dx.doi.org/10.1371/journal.pone.0258303.

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Background The effect on neonatal mortality of mode of delivery of a fetus in breech presentation at an extremely preterm gestational age remains controversial. Objective To compare mortality associated with planned vaginal delivery (PVD) of fetuses in breech presentation with that of fetuses in breech presentation with a planned cesarean delivery (PCD). Material and methods Retrospective study reviewing records over a 19-year period in a level 3 university referral center of singleton infants born between 25+0 and 27+6 weeks of gestation, alive on arrival in the delivery room, and weighing at least 500 grams at birth. Infants in the first group were in breech presentation with PVD and the second in breech presentation with PCD. The principal endpoint was neonatal death. Results During the study period, we observed 113 breech presentations with PVD, and 80 breech presentations with PCD. Although not significant after adjustment, neonatal mortality in the breech PVD group was more than twice that of the breech PCD group (19.5 vs 7.8%, P = 0.031, ORa = 2.6, 95% CI 0.8–9.3, NNT = 8). This higher neonatal mortality in the breech PVD group was exclusively associated with a higher risk of death in the delivery room (12.4 vs 0.0% P = 0.001, OR not calculable, NNT = 8). In these extremely preterm breech presentations with PVD, neonatal mortality in the delivery room was associated with entrapment of the aftercoming head, cord prolapse, and a short duration of labor. Conclusion For deliveries between 25+0 and 27+6 weeks’ gestation, vaginal delivery in breech presentation is associated with a higher risk of death in the delivery room.

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Firmansyah, Hafiz, i M. Afief Ma'ruf. "THE ANALYSIS OF HORIZONTAL DRAIN DESIGN IN SOFT SOIL REINCFORCEMENT". CERUCUK 3, nr 1 (19.09.2019): 35. http://dx.doi.org/10.20527/crc.v3i1.1103.

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To help the process of consolidation of the soil, On the port access road Trisakti using Prefabricated Vertical Drain (PVD) materials. Of the work (PVD) thing to note is the horizontal drainage, because it was feared the absence of Horizontal Drain work item function of PVD become non-optimal even it might does not work, so the necessary design analysis of Horizontal Drain that can be used on the project. Analysis of Horizontal Drain design is intended to get the Horizontal Drain design alternatives the most optimal based on quality, cost and time.The methods used in the analysis of the design of Horizontal Drain this is a soft soil improvement method using PVD with attention to soil degradation and the planning of the heap.In the design of the installation of PVD method using static, obtained the degree of consolidation of 90% takes 9.33 months. The calculation of Horizontal Drain in the discharge value must be in flush in one horizontal drain line is (minimum permeability). From the results of the analysis there is some material horizontal drain of qualified (in terms of time, cost and quality of workmanship) then get : Rough sand (10.93, Rp. 24.050.000.000,-, and 9.4 months), Fine sand (16.24, Rp-16,835,000,000.0, and 9.4 months), PHD (Horizontal Prefabricated Drain) (74.01, Rp-13,101,140,000.0, and 5.6 months) so that it can be concluded that the material PHD (Horizontal Prefabricated Drain) the most efficient in terms of quality, cost, and time. Keywords: Consolidation, Degrees of consolidation, Horizontal Drain, Preloading, Prefabricated Vertical Drain (PVD), Prefabricated Horizontal Drain (PHD).

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S. P., Preethi, i Tejaswi Hemachandran. "Serum homocysteine as a predictor of severity of peripheral arterial disease in association with Doppler ultrasonography". International Surgery Journal 6, nr 11 (24.10.2019): 3977. http://dx.doi.org/10.18203/2349-2902.isj20195108.

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Background: To evaluate association between raised serum homocysteine levels and severity of peripheral vascular disease (PVD) and to assess the role of homocysteine as a prognostic marker in PVD and thereby aid in early referrals to prevent cerebral and coronary events in those patients and introduce homocysteine lowering with vitamin therapy as part of medical management in patients diagnosed with PVD.Methods: The serum homocysteine levels was measured in all patients admitted for peripheral vascular disease of upper and/or lower limb and to correlate the above values with Doppler ultrasonography (USG) in the duration between 2016-2018 (18 months).Results: The comparison of homocysteine levels with Doppler shows corresponding significant increase in Serum Hcy levels only in cases of moderate PVD. Statistical analysis with binary logistic regression does show a significant association with moderate severity of PVD and serum homocysteine levels with 66.7% predictability.Conclusions: There was significant association of homocysteinemia only in Moderate PVD with no statistically significant correlation with mild, severe cases of peripheral arterial disease (PAD) and radiological normal cases, further large randomised trials are required to elucidate its clinical relevance in PAD as a prognostic marker of severity.

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Ivinza Lepapa, Alphonse-Christian. "Du modèle d’alignement stratégique des TI au Leapfrog : Structure causale ou systémique". Acta Europeana Systemica 8 (10.07.2020): 241–54. http://dx.doi.org/10.14428/aes.v8i1.56423.

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Cet article a pour objectif de mettre en avant l’analyse des «Impacts Organisationnels des TIC » qui utilisent les approches systèmes et qui font appel à l’utilisation des modèles. Le centre d’intérêt se situe dans l’école de la conception de systèmes. Après une brève présentation du modèle d’alignement stratégique (SAM : Strategic Alignement Model, 1991, p.172) de Vankatramam, nous introduisons le concept de Leapfrog. L’environnement de l’étude concerne les pays en voie de développement (PVD) et les pays sous développé (PSD). Aussi, nous pouvons considérer la RDC et les autres pays africains qui font partie de notre échantillon comme étant des PVD ou des PSD.La Crise managériale dans les entreprises des PSD et PVD est abordée en deux points: d’abordnous rappelonsla classification des pays suivant le potentiel de développement informatique (CIDP - Computer Industrial Development Potential), et ensuite, nous évoquons les facteurs de crise managériale dans ces pays (en Afrique). L’examen de la résolution des crises managériales des PVD et PSD est effectué sous deux angles. D’abord par un survol du Leapfrog en Afrique: Royaume de l’innovation. Ensuite par l’analyse de l’informatisation des entreprises congolaises suivant le modèle d’alignement stratégique (Ivinza Lepapa, 2007). Comment les PVD et les PSD adoptent les TIC? Nous repartons d’un échantillon d’une thèse de doctorat réalisée à l’ULB (Ivinza Lepapa et Wilikin Luc, Solvay 2007) nous expliquons et explorons comment l’adoption des TIC dans ces pays ne respectait pas une structure causale linéaire comme dans les pays occidentaux. Mais effectuaient drôlement un bond organisationnel qui migrait vers une structure systémique que les économistes de développement appellent aujourd’hui Leapfrog.

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Silva, R. M., J. C. Souza, H. J. Fernandes, U. G. P. Abreu, P. B. Ferraz Filho i A. N. Rosa. "Eficiência produtiva ao desmame de vacas Nelore criadas no Pantanal". Arquivo Brasileiro de Medicina Veterinária e Zootecnia 67, nr 4 (sierpień 2015): 1105–10. http://dx.doi.org/10.1590/1678-4162-6909.

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O trabalho objetivou avaliar a eficiência produtiva de vacas ao desmame de acordo com seu tamanho (peso) e estimar correlação fenotípica entre as características peso do bezerro ao desmame (PBD), peso da vaca ao desmame do bezerro (PVD) e relação desmame (RD = PBD/ PVD) de animais da raça Nelore criados no Pantanal de Mato Grosso do Sul. Foram utilizadas 706 observações para pares de dados de pesos de vacas e de bezerros da raça Nelore ao desmame criados em regime de pastejo. Foram formados seis grupos com base no peso de vaca ao desmame (GPVD) a partir dos desvios (40,73kg) de peso em relação à média geral do rebanho (420,56kg). Os grupos de vacas com menores pesos obtiveram maiores RD. As correlações fenotípicas entre PVD e PBD variaram de 0,05 a 0,26, enquanto para PVD e RD as correlações foram negativas e com variação de 0,11 a 0,25. As correlações fenotípicas entre PBD e RD apresentaram-se positivas e de alta magnitude (0,91 a 0,98). As maiores eficiências produtivas foram determinadas para vacas de pequeno a médio porte (327,20 a 438,62kg), além de estas serem menos exigentes quanto a nutrientes digestíveis totais (NDT). A seleção de vacas de tamanho médio (379, 83 a 461,29kg) apresenta-se mais vantajosa por gerar menor custo de mantença que as vacas maiores e produzir bezerros mais pesados que as vacas menores.

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Al Harits, Ahmad Yasin, i Istiatun Istiatun. "PERBANDINGAN METODE PRELOADING DENGAN VAKUM KONSOLIDASI TANAH PADA PEMODELAN DI LABORATORIUM". PROKONS Jurusan Teknik Sipil 15, nr 1 (28.02.2021): 57. http://dx.doi.org/10.33795/prokons.v15i1.282.

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ABSTRACT This study aims to determine the parameter comparison of the magnitude of the primary reduction and consolidation time in the preloading method using PVD and vacuum method using PVD with modeling in the laboratory. The benefit of this research is that it can provide a comparison of the preloading method and the vacuum method in terms of accelerating the consolidation time as well as contributing to science in the field of soil improvement. Primary consolidation theory is used in this research. Quantitative descriptive research method with testing data collection techniques by means of modeling in the laboratory. The modeling of the vacuum method used a test tub measuring (1.2 × 0.6 × 0.9) m, the vacuum pump suction capacity of 5 Pa, the air hose as PHD and geomembrane cloth as PVD material. The preloading method with PVD uses a test tub measuring (0.8 × 0.6 × 0.9) m, preloading load in the form of bangka sand (ɣ = 1.532 t / m³) with a thickness of 10 cm and a geomembrane cloth as PVD material. In each test basin filled with soil and water with a soil volume weight of 1.3 t / m³, a ground surface height of 0.5 m and a groundwater level of 0.42 m. The results showed that with the same amount of reduction, namely 7.26 mm preloading method using PVD took 81 hours while in the vacuum method the time needed was 41 hours. Thus it can be concluded that the reduction in the vacuum method is faster than the preloading method with PVD. Keywords: Primer settelment, PVD, Vacum, consolidation time

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Rozprawy doktorskie na temat "PVD"

Matuška, Martin. "Aplikace PVD povlaků pro frézování". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-229048.

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This dissertation treats of the influence of PVD coats to a change of tool lifetime. The theoretical part of the dissertation describes the adjustment of tools before the process of coating. Following part describes the specific properties of deposited layers of the coating and its measuring. There is also the enumeration and specification of selected ways of depositing PVD coats and brief description of its advantages and disadvantages. Second part of the dissertation is focused on an experiment with measuring of the tool force loading and its change depending to the tool wear. There are compared four short four-edged milling cutters with a coat and as well without it. Those tools were made of high speed steel by the conventional way and also by the powder metallurgy. Milling operation was done by down and up milling technique. The evaluation of the experimental results for powder metallurgy tools confirmed that these tools are advantageous compared to the standard high speed steel tools.

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Kuhn, Marius. "Verschleissschutzkonzepte für Wälzlager mittels PVD-Beschichtungen /". Aachen : Mainz, 2006. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=016032014&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.

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Ives, Malcolm. "Fundamental studies of the PVD technique". Thesis, Sheffield Hallam University, 1994. http://shura.shu.ac.uk/19861/.

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A study and comparison of two commercially available and competitive physical vapour deposition techniques has been made. Titanium nitride (the most widely used hard and decorative coating) has been deposited by both steered arc and the new Arc Bond Sputter (ABS) magnetron technique under a range of deposition conditions. The coatings have subsequently been analysed by a variety of methods and the results reported here. The steered arc technique has been identified as the better technique for everyday ease of use in producing mononitride and monocarbide coatings with good batch uniformity and reproducibility in terms of composition and microstructure. However, for versatility the ABS magnetron technique allows the possibility to vary multiple parameters and hence change coating properties at will, albeit with some difficulty to maintain stable and reproducible operation. In this respect, plasma uniformity is discussed and problems with water vapour contamination and gas flow regulation are highlighted and possible solutions suggested. The coating-substrate interface region is considered, and the merits of metallic interlayers and arc etching are compared. An interlayer achieves good adhesion only at an optimum thickness as confirmed in this work. The good adhesion afforded by the arc etch phase of both processes is addressed and the ion-surface interactions modelled using commercially available computer software. The improvement in adhesion on high speed steel is explained by sputtering of the substrate matrix leaving hard carbide particles standing proud of the surface. When deposition takes place, the carbides mechanically key the coating to the substrate surface, and also possibly act as physical blocks to interfacial crack propagation. A theoretical contribution to the explanation of preferred crystallographic orientation during coating deposition is proposed derived from experimental results, surface physics and semiconductor growth theory. This attempts to explain the flexibility of sputtering techniques to produce a wide range of orientations, and the reasons why arc evaporation almost always produces {111} orientated coatings. Finally, a consideration of a comparatively new analytical technique (Glow Discharge Optical Emission Spectroscopy) to the application of PVD coatings evaluation is addressed. The speed and versatility of this technique makes it strategically important in the future research, development and quality control of thin film production.

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Jaroš, Aleš. "Aplikace PVD povlaků pro čelní frézování". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-229043.

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Diploma thesis is focused on the application of PVD coatings for face milling. The theoretical part, systematically, deals with the division of coating methods. PVD method is stressed here. Treatment of material before coating is described as well. The machine, the machine tool and cutting material is described in the experimental section. The aim of the work was comparison of coating exchangeable cutting tips (VBD) to uncoated ones. Based on experiment, it is clear that the use of PVD coatings resulted in reduction of cutting powers and lifetime was increased.

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Santos, da Silva Cruz Ricardo Manuel. "TiB2 ceramic and DLC multilayered PVD coatings". Thesis, Cranfield University, 2007. http://dspace.lib.cranfield.ac.uk/handle/1826/1863.

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Titanium diboride (TiB2) has been investigated as a potential candidate for several industrial applications, such as: cutting tools, electric devices, wear parts and many more fields of application. The main drawback of TiB2 is its brittle nature, which has limited its range of applications. Diamond-like Carbon (DLC) has been used in industrial applications, mainly for wear resistant parts. However, the application of DLC films has been limited by the level of internal stress accumulated during deposition. This thesis investigates the deposition of TiB2/DLC multilayer wear resistant coatings to overcome these limitations. The thesis focuses on the tribological effects caused by different deposition techniques on TiB2 ceramic used by the coatings industry today, in order to overcome the brittle nature of TiB2 and the lack of adhesion of DLC films. The multilayer coatings consisted of 25 bi-layers of TiB2/DLC. These TiB2/DLC coatings were fabricated, maintaining a constant composition wavelength (sum of two layers Î» =200 nm) for an array of ceramic fractions ranging from 25% to 95% by volume using as substrates, tool steel AISI 1095 and powder metallurgy aluminium alloys, type 2618. The effect of the DLC content on the structure and performance (hardness, adhesion and wear) of the films was investigated. The bi-layer thickness influences the failure patterns observed in the scratch testing. These observations have been used to optimise the multilayered coating structure. Multilayer coatings have been manufactured to increase surface hardness and wear resistance as applied to a commercial powder metallurgy Al alloys (Al 2618) used in the automotive industry. Optimum coatings have found hardness values of 27.8 GPa, with a critical load of 20 N and a friction coefficient of 0.47. As a result of wear tests the multilayer with 10% of DLC was found to be best compromise between high hardness (23.8 GPa), good adhesion (critical load higher than 20 N), low friction and low wear rate.

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Costa, Midori Yoshikawa Pitanga [UNESP]. "Fadiga em titânio aeronaútico revestido por PVD". Universidade Estadual Paulista (UNESP), 2009. http://hdl.handle.net/11449/103746.

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Made available in DSpace on 2014-06-11T19:32:50Z (GMT). No. of bitstreams: 0 Previous issue date: 2009-08-17Bitstream added on 2014-06-13T19:22:31Z : No. of bitstreams: 1 costa_myp_dr_guara.pdf: 6972028 bytes, checksum: 99390a220ba003846f11527479388013 (MD5)
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Na indústria aeronáutica, propriedades como elevada razão resistência mecânica/peso e resistência à corrosão são as razões principais para o uso das ligas de titânio em componentes estruturais, substituindo ligas de alumínio e de aço. Contudo, em componentes mecânicos submetidos ao desgaste, a estrutura hexagonal compacta do titânio somada ao baixo limite de resistência ao cisalhamento requer o uso do material base com um tratamento superficial específico. Os componentes de trem-de-pouso, geralmente submetidos a um ambiente corrosivo sob carregamentos cíclicos, exigem caracterização quanto a resistência à fadiga. Nesta pesquisa é realizado o estudo do comportamento em fadiga da liga Ti-6Al-4V tratada superficialmente em 3 condições: Anodizada, revestida por HVOF com carbeto de tungstênio; e revestida com TiN, CrN e WC por PVD. Os ensaios pino-disco proporcionam uma análise comparativa da resistência ao desgaste dos revestimentos estudados. O principal objetivo deste estudo é avaliar o comportamento em fadiga e ao desgaste da liga Ti-6Al-4V sob diferentes tratamentos superficiais de tal forma que esse material possa substituir as ligas de aço atualmente utilizadas em componentes aeronáuticos. Os resultados mostram que a liga Ti-6Al-4V revestida com WC:H (DLC) por PVD é o melhor sistema de revestimento a ser empregado considerando o desempenho em resistência a fadiga e ao desgaste.
In the aeronautical industry, properties as high strength/weight ratio and effective corrosion resistance are primary reasons for the use of titanium alloys in structural components, in the replacement of steel or aluminum alloys. In mechanical components subjected to friction, the titanium hexagonal close packed crystalline structure in addition to the low shear resistance limit the use of the base material as received, then a specific surface treatment is required. Fatigue strength is an important property for components under cyclical loading and corrosive environment as landing gears. This research presented an evaluation of fatigue strength of Ti-6al-4V alloy in three main conditions: anodized, coated by HVOF with WC-10%Co-4% Cr and coated by PVD with TiN, CrN e WC. The pin-disc tests were carried out to obtain a comparative analysis among coatings wear resistance. The main propose of this research is replace the AISI 4340 alloy by Ti-6Al-4V, reducing the aeronautic component weight. Ti-6Al-4V DLC coated by PVD process is the chosen coating system alternative considering fatigue and wear resistance.

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Steenbakker, Remy. "Phosphor thermometry in an EB-PVD TBC". Thesis, Cranfield University, 2008. http://dspace.lib.cranfield.ac.uk/handle/1826/5653.

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Thermal Barrier Coatings (TBCs) are used to reduce the actual working temperature of the high pressure turbine blade surface. Knowing the temperature across a TBC and at the interface with the thermally grown oxide (TGO) under realistic conditions is highly desirable. As the major life#controlling factors for TBC systems are linked with temperature, this would provide useful data for a better understanding of these phenomena and to assess the remnant life#time of the TBC. This would also enable the design of advanced cooling strategies in the most efficient way using a minimum amount of air. Further the integration of a sensor coating into an on#line temperature detection system will enable the full potential of TBCs to be realised due to improved precision in temperature measurement and early warning of degradation. This in turn will increase fuel efficiency and reduce CO2 emissions. The concept of sensing TBCs was patented by Choy et al. [114] in 1998 and consists of locally modifying the composition of the TBC so that it acts as a thermographic phosphor. As a result, the temperature dependence of the lifetime of the laser induced phosphorescence process can be used for temperature measurements. The purpose of this work was to develop a multilayer sensing TBC deposited by electron beam physical vapour deposition (EB#PVD) which could be used to remotely measure the temperature at different depths in the coating. In this study, the reader is introduced to the theory of luminescence sensing and its TBC application. Several yttria partially stabilised zirconia TBCs, co#doped with rare earth oxides (YSZ:RE) phosphors, were studied and it was shown that dysprosia doped YSZ has the highest temperature sensitivity. The influence of dopant concentration, layering and high temperature aging on the phosphorescence process were also researched. During the project, a novel, non#destructive, method to monitor the high temperature degradation of the TBC using phosphorescence measurements was found. Alternative phosphor compositions, based on yttrium aluminium garnet (YAG) material, were successfully deposited by EB#PVD and it was shown that doped YAG TBC compositions could further improve the maximum temperature measurement capability of current sensing TBCs. A multilayer EB#PVD coating comprising of two different phosphor layers was deposited and tested in order to demonstrate that such systems could be used to remotely measure the temperature at two different depths in the TBC simultaneously and therefore to monitor the thermal gradient in the coating, permitting the direct measurement of heat flux under thermal gradient conditions, for example in service.

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Silva, Cruz Ricardo Manuel Santos da. "TiBâ‚‚ ceramic and DLC multilayered PVD coatings". Thesis, Cranfield University, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.443347.

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Costa, Midori Yoshikawa Pitanga. "Fadiga em titânio aeronaútico revestido por PVD /". Guaratinguetá : [s.n.], 2009. http://hdl.handle.net/11449/103746.

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Orientador: Maria Odila Hilário Cioffi
Banca: Marcelo dos Santos Pereira
Banca: Miguel Justino Ribeiro Barboza
Banca: Carlos Antonio Reis Pereira Baptista
Banca: Carlos Moura Neto
Resumo: Na indústria aeronáutica, propriedades como elevada razão resistência mecânica/peso e resistência à corrosão são as razões principais para o uso das ligas de titânio em componentes estruturais, substituindo ligas de alumínio e de aço. Contudo, em componentes mecânicos submetidos ao desgaste, a estrutura hexagonal compacta do titânio somada ao baixo limite de resistência ao cisalhamento requer o uso do material base com um tratamento superficial específico. Os componentes de trem-de-pouso, geralmente submetidos a um ambiente corrosivo sob carregamentos cíclicos, exigem caracterização quanto a resistência à fadiga. Nesta pesquisa é realizado o estudo do comportamento em fadiga da liga Ti-6Al-4V tratada superficialmente em 3 condições: Anodizada, revestida por HVOF com carbeto de tungstênio; e revestida com TiN, CrN e WC por PVD. Os ensaios pino-disco proporcionam uma análise comparativa da resistência ao desgaste dos revestimentos estudados. O principal objetivo deste estudo é avaliar o comportamento em fadiga e ao desgaste da liga Ti-6Al-4V sob diferentes tratamentos superficiais de tal forma que esse material possa substituir as ligas de aço atualmente utilizadas em componentes aeronáuticos. Os resultados mostram que a liga Ti-6Al-4V revestida com WC:H (DLC) por PVD é o melhor sistema de revestimento a ser empregado considerando o desempenho em resistência a fadiga e ao desgaste.
Abstract: In the aeronautical industry, properties as high strength/weight ratio and effective corrosion resistance are primary reasons for the use of titanium alloys in structural components, in the replacement of steel or aluminum alloys. In mechanical components subjected to friction, the titanium hexagonal close packed crystalline structure in addition to the low shear resistance limit the use of the base material as received, then a specific surface treatment is required. Fatigue strength is an important property for components under cyclical loading and corrosive environment as landing gears. This research presented an evaluation of fatigue strength of Ti-6al-4V alloy in three main conditions: anodized, coated by HVOF with WC-10%Co-4% Cr and coated by PVD with TiN, CrN e WC. The pin-disc tests were carried out to obtain a comparative analysis among coatings wear resistance. The main propose of this research is replace the AISI 4340 alloy by Ti-6Al-4V, reducing the aeronautic component weight. Ti-6Al-4V DLC coated by PVD process is the chosen coating system alternative considering fatigue and wear resistance.
Doutor

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Fořt, Tomáš. "Charakterizace nanostruktur deponovaných PVD a CVD technologiemi". Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-233449.

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The thesis deals with mechanical properties of thin hard wear-resistant coatings. The work presents a method of dynamic testing of thin hard coatings on a newly constructed prototype of impact wear tester. It provides a comparison with standard methods of layer testing and presents new experimental results of dynamic impact wear test of the coatings. Finally, the thesis covers preparation techniques of thin film systems deposited on various substrates and their characterization using optical and electron microscopy.

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Książki na temat "PVD"

Moran, Robert. Physical vapor deposition (PVD). Norwalk, Conn., U.S.A: Business Communications Co., 1990.

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Moran, Robert. Thin layer deposition: Highlighting PVD. Norwalk, CT: Business Communications Co., 2000.

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Robert, Moran. Thin layer deposition: Highlighting PVD. Norwalk, CT: Business Communications Co., 1996.

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Mattox, D. M. Handbook of physical vapor deposition (PVD) processing. Wyd. 2. Norwich, N.Y: William Andrew, 2010.

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Krämer, Gernot. Arc-PVD-Beschichtung von Hartmetallen für den unterbrochenen Schnitt. Düsseldorf: VDI Verlag, 1993.

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1933-, Pulker H. K., i Bergmann E, red. Wear and corrosion resistant coatings by CVD and PVD. Chichester: E. Horwood, 1989.

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Souare, Cheikhou. Structure fiscale en PVD: L'état de la question au Sénégal. Dakar-Fann, Sénégal: Université Cheikh Anta Diop de Dakar, Faculté des sciences économiques et de gestion, Centre de recherches économiques appliquées, 1997.

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Yong, Sun. Plasma nitriding and PVD ceramic coating of low alloy steel. Birmingham: University of Birmingham, 1989.

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Olbrich, Walter. Entwicklung und Optimierung von Prozeßkomponenten zur ionenunterstützten Abscheidung bei PVD-Verfahren. Berlin, Heidelberg: Springer Berlin Heidelberg, 1994. http://dx.doi.org/10.1007/978-3-642-47892-5.

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Badarou, Moussèmilou. Mise en place d'un système de gestion des PME commerciales en PVD. [Cotonou?]: République du Bénin, Université nationale du Bénin, Faculté des sciences juridiques, économiques et politiques, 1987.

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Części książek na temat "PVD"

Gooch, Jan W. "PVD". W Encyclopedic Dictionary of Polymers, 598. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_9638.

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Shekhar, Shashi, i Hui Xiong. "PVD". W Encyclopedia of GIS, 928. Boston, MA: Springer US, 2008. http://dx.doi.org/10.1007/978-0-387-35973-1_1049.

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Lake, Markus K. "PVD-Beschichtungstechnologie". W Medizintechnik, 879–96. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-93936-8_37.

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Olbrich, Walter. "PVD-Verfahrenstechnologie". W Entwicklung und Optimierung von Prozeßkomponenten zur ionenunterstützten Abscheidung bei PVD-Verfahren, 20–59. Berlin, Heidelberg: Springer Berlin Heidelberg, 1994. http://dx.doi.org/10.1007/978-3-642-47892-5_4.

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Mattox, Donald M. "PVD: Ion Plating". W Encyclopedia of Tribology, 2717–26. Boston, MA: Springer US, 2013. http://dx.doi.org/10.1007/978-0-387-92897-5_685.

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Constantin, Raymond, Pierre-Albert Steinmann i Christian Manasterski. "Decorative PVD Coatings". W Nanomaterials and Surface Engineering, 109–62. Hoboken, NJ USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118618523.ch5.

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Bouzakis, Konstantinos-Dionysios, i Nikolaos Michailidis. "Physical Vapor Deposition (PVD)". W CIRP Encyclopedia of Production Engineering, 1–8. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-642-35950-7_6489-4.

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Bouzakis, Konstantinos-Dionysios, i Nikolaos Michailidis. "Physical Vapor Deposition (PVD)". W CIRP Encyclopedia of Production Engineering, 1–8. Berlin, Heidelberg: Springer Berlin Heidelberg, 2018. http://dx.doi.org/10.1007/978-3-642-35950-7_6489-5.

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Bouzakis, Konstantinos-Dionysios, i Nikolaos Michailidis. "Physical Vapor Deposition (PVD)". W CIRP Encyclopedia of Production Engineering, 1308–16. Berlin, Heidelberg: Springer Berlin Heidelberg, 2019. http://dx.doi.org/10.1007/978-3-662-53120-4_6489.

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Matthews, Allan, i Kenneth Holmberg. "PVD and CVD Coatings". W Encyclopedia of Tribology, 2705–11. Boston, MA: Springer US, 2013. http://dx.doi.org/10.1007/978-0-387-92897-5_724.

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Streszczenia konferencji na temat "PVD"

Santos, Fabricia Ferreira Dos, Lucas Adrial Tavares Santos, Savyo Nunes De Oliveira, Irinaldo Diniz Basílio Júnior i Valdemir Da Costa Silva. "AVALIAÇÃO DO PERFIL DE QUALIDADE E A ATIVIDADE ANTIMICROBIANA DE EXTRATOS DA PRÓPOLIS VERMELHA COMERCIALIZADOS EM ALAGOAS". W III Congresso Brasileiro de Ciências Farmacêuticas On-line. Revista Multidisciplinar em Saúde, 2022. http://dx.doi.org/10.51161/conbracif/21.

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Introdução: A própolis vermelha (PV) é um produto natural de composição química complexa e exclusiva produzida por abelhas Apis mellífera. O crescente uso popular do extrato de própolis vermelha ocorre devido suas propriedades biológicas e tem gerado a comercialização do extrato de maneira irregular. Objetivos: Objetivou-se nesse trabalho avaliar o perfil de qualidade e a atividade antimicrobiana de extratos da PV comercializados em Alagoas. Material e métodos: Os extratos foram obtidos em estabelecimentos comerciais de Maceió e denominados como: PV (A, B, C, D e E). O controle de qualidade foi realizado quanto aos aspectos organolépticos, teor de sólidos solúveis, fenóis e flavonoides totais. A atividade antioxidante foi avaliada pelo método DPPH. A atividade antimicrobiana foi realizada através da concentração inibitória mínima (CIM). Resultados: Os resultados revelam que os extratos tinham coloração e aroma similar. Apenas o extrato PVE apresentou teor de extrato seco acima de 11% de acordo com o Ministério da Agricultura, Pecuária e Abastecimento (MAPA). O extrato PVB revelou o maior teor de compostos fenólicos com 210,4 ± 2,4 mgEAG. g-1. Já o extrato PVC apresentou maior índice de flavonoides totais com 118,2 ± 4,2 mgEQ; g-1. Quando avaliado a atividade antioxidante destaca-se a PVC com maior capacidade de inibir o radical DPPH (87,8 ± 2,9 %). Os extratos PVC, PVD e PVE, apresentaram menor CIM (15,625 µg/mL) frente a E. coli e S. aureus. Conclusão: Diante do exposto, somente o extrato PVE foi satisfatório de acordo com o MAPA. Os demais extratos foram satisfatórios após ajuste de concentração, demonstrando a necessidade de maior controle de qualidade na comercialização.

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Gawron, Marian, Feng Cheng i Christoph Meinel. "PVD: Passive vulnerability detection". W 2017 8th International Conference on Information and Communication Systems (ICICS). IEEE, 2017. http://dx.doi.org/10.1109/iacs.2017.7921992.

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Su, Fei, John Markus Bjorndalen, Phuong Hoai Ha i Otto J. Anshus. "pVD — Personal Video Distribution". W 2013 IEEE 9th International Conference on Wireless and Mobile Computing, Networking and Communications (WiMob). IEEE, 2013. http://dx.doi.org/10.1109/wimob.2013.6673431.

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Högfeldt, P., T. Rosell i H. Ljungcrantz. "Time for Lean PVD". W Society of Vacuum Coaters Annual Technical Conference. Society of Vacuum Coaters, 2014. http://dx.doi.org/10.14332/svc14.proc.1835.

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Tang, Huidong, Zhengren Huang i Shouhong Tan. "PVD SiC and PVD Si coatings on RB SiC for surface modification". W 2nd international Symposium on Advanced Optical Manufacturing and Testing Technologies, redaktorzy Li Yang, Shangming Wen, Yaolong Chen i Ernst-Bernhard Kley. SPIE, 2006. http://dx.doi.org/10.1117/12.674197.

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He, Xiaoqing, Peter Ercius, Jeff Bailey, Geordie Zapalac, Neil Mackie, Atiye Bayman, Joel Varley, Vincenzo Lordi i Angus Rockett. "Cu rich domains and secondary phases in PVD-CdS / PVD-CuIn1−xGaxSe2 heterojunctions". W 2015 IEEE 42nd Photovoltaic Specialists Conference (PVSC). IEEE, 2015. http://dx.doi.org/10.1109/pvsc.2015.7356414.

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Swaminathan, Ganesh, Suraj Thyagaraj, Francis Loth, Susan McCormick i Hisham Bassiouny. "Influence of Intermittent Pneumatic Compression on Wall Shear Stress and Nitric Oxide Levels". W ASME 2011 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2011. http://dx.doi.org/10.1115/sbc2011-53670.

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Wall shear stress (WSS) in blood vessels has been shown to play an important role in the development of atherosclerosis. In particular, regions of low and oscillating WSS have been shown to correlate with the localization of atherosclerosis. Thus, we hypothesize that increasing the WSS for patients with peripheral vascular diseases (PVD) will either reduce PVD severity or slow its progression. We analyzed WSS changes from a study by Delis et al. on 32 limbs of PVD patients [1]. Results show that intermittent pneumatic compression (IPC) increases mean WSS by 170% and 240% in PVD patients and healthy subjects, respectively. Peak WSS was found to increase by 93% and 40% in PVD patients and healthy subjects, respectively. In addition, we examined changes in NOX level with use of IPC on five limbs from PVD patients. Our study demonstrated increased NOx levels in subjects after IPC. Further research is needed to determine the benefits of IPC for PVD patients.

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Welker, A. L., B. J. Devine i R. R. Goughnour. "Development of the PVD Permeameter". W Geo-Frontiers Congress 2005. Reston, VA: American Society of Civil Engineers, 2008. http://dx.doi.org/10.1061/40782(161)29.

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Tierno, Davide, M. Hosseini, M. van der Veen, A. Dangol, K. Croes, S. Demuynck, Zs Tokei, E. D. Litta i N. Horiguchi. "Reliability of Barrierless PVD Mo". W 2021 IEEE International Interconnect Technology Conference (IITC). IEEE, 2021. http://dx.doi.org/10.1109/iitc51362.2021.9537545.

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Mydlar, Martin, Jan Vanda, Jan Brajer i Radek Poboril. "Laser removal of PVD coatings". W Laser-Induced Damage in Optical Materials 2022, redaktorzy Christopher W. Carr, Detlev Ristau i Carmen S. Menoni. SPIE, 2022. http://dx.doi.org/10.1117/12.2642743.

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Raporty organizacyjne na temat "PVD"

Lee, S. L., R. Wei, J. Lin, R. Chistyakov, D. Schmidt, M. Cipollo, F. Yee i M. Todaro. New PVD Technologies for New Ordnance Coatings. Fort Belvoir, VA: Defense Technical Information Center, kwiecień 2012. http://dx.doi.org/10.21236/ada588202.

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Swanson, Carl, Rick Bright, Lynn Thompson i Pete Peterson. ADST, Version Description Document for the BDS-D PVD 1.0.0. Fort Belvoir, VA: Defense Technical Information Center, kwiecień 1993. http://dx.doi.org/10.21236/ada282808.

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Swanson, Carl, Brad Mohning i Pete Peterson. ADST Cold Start Procedures Manual for the BDS-D PVD 1.0.0. Fort Belvoir, VA: Defense Technical Information Center, maj 1993. http://dx.doi.org/10.21236/ada282811.

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Tanzi, Vito. La Liberalization del Comercio y los Impuestos al Comercio. Inter-American Development Bank, sierpień 2003. http://dx.doi.org/10.18235/0011887.

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Habitualmente, los impuestos al comercio han sido una importante fuente de ingresos en los países en vías de desarrollo (PVD). En todos los PVD han representado casi un tercio de los ingresos fiscales. En los países latinoamericanos el porcentaje de los ingresos totales ha sido menor y ha ido disminuyendo en los últimos años. Pero estos impuestos continúan revistiendo importancia en especial en los países pequeños y en los insulares. La Ronda Doha y los programas de integración regional actualmente en curso, al requerir la eliminación de estos impuestos, podrían provocar una reducción en los ingresos y crear dificultades macroeconómicas en algunos países.

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Tanzi, Vito. La Liberalization del Comercio y los Impuestos al Comercio. Inter-American Development Bank, sierpień 2003. http://dx.doi.org/10.18235/0007424.

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Esta presentación fue comisionado por la Red de Integración y Comercio del Diálogo Regional de Política para la V Reunión Hemisférica celebrada los días 14 y 15 de agosto de 2003. Habitualmente, los impuestos al comercio han sido una importante fuente de ingresos en los países en vías de desarrollo (PVD) En todos los PVD han representado casi un tercio de los ingresos fiscales. En los países latinoamericanos el porcentaje de los ingresos totales ha sido menor y ha ido disminuyendo en los últimos años. Pero estos impuestos continúan revistiendo importancia en especial en los países pequeños y en los insulares.

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Sugar, Joshua, Norman Bartelt, Peter Sharma, David Adams i Joseph Michael. Long-Term Stability of PVD/Sputtered Au Electrical Contacts to Thermoelectric Bi2Te2: Re-evaluation of SAND2015-7203. Office of Scientific and Technical Information (OSTI), marzec 2022. http://dx.doi.org/10.2172/1847492.

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Cerio, Frank. Development of Production PVD-AIN Buffer Layer System and Processes to Reduce Epitaxy Costs and Increase LED Efficiency. Office of Scientific and Technical Information (OSTI), wrzesień 2013. http://dx.doi.org/10.2172/1111425.

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Ćirić, Slavica, Gordana Cvetković, Slaviša Stojković i Slaviša Gudžić. Detection of PVY, PLRV and PVX Potato Viruses in Some Regions of Serbia. "Prof. Marin Drinov" Publishing House of Bulgarian Academy of Sciences, maj 2018. http://dx.doi.org/10.7546/crabs.2018.04.17.

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Huayamave, Victor, Eduardo Divo, Andres Ceballos, Carolina Barriento, Barkaszi Stephen i Seigneur Hubert. Real-time POD-CFD Wind-Load Calculator for PV Systems. Office of Scientific and Technical Information (OSTI), marzec 2014. http://dx.doi.org/10.2172/1124137.

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