International School on Quantum Electronics: Laser Physics and Applications最新文献_第10页

Dark-state resonances observed on the D2 line of potassium 在钾的D2谱线上观察到的暗态共振

International School on Quantum Electronics: Laser Physics and Applications Pub Date : 2017-01-05 DOI: 10.1117/12.2264223

A. Krasteva, S. Gateva, C. Andreeva, G. Alzetta, S. Gozzini, L. Moi, D. Sarkisyan, K. Nasyrov, S. Cartaleva

引用次数: 0

Comparative study of electron and laser beam surface alloying 电子束与激光束表面合金化的比较研究

International School on Quantum Electronics: Laser Physics and Applications Pub Date : 2017-01-05 DOI: 10.1117/12.2262352

S. Valkov, P. Petrov, R. Lazarova

{"title":"Comparative study of electron and laser beam surface alloying","authors":"S. Valkov, P. Petrov, R. Lazarova","doi":"10.1117/12.2262352","DOIUrl":"https://doi.org/10.1117/12.2262352","url":null,"abstract":"High intensity energy fluxes, such as electron beams and laser beams are widely used for surface alloying of metals and alloys. These technologies are able to cause the formation of the so called melt pool where the alloying elements interact each other. It is known that the homogenization of the surface alloy can be explained by intense Marangoni convection, caused by the high temperature gradient in the melt pool. The convection is inversely to the speed of the specimen motion during the alloying process and therefore, the choice of low alloying velocity will reflect on more homogeneous structure of the obtained alloy. In this study, a comparison of the structure and properties of electron and laser beam surface alloying of aluminium with niobium was conducted. The phase composition of the alloyed layers was determined by XRD (X-ray diffraction) with CuKα radiation. The microstructure was studied by SEM (Scanning Electron Microscopy). Chemical analysis was carried out using an EDX electron probe microanalyser. The microhardness of the obtained samples is also measured and compared with respect to the technology of the formation of each surface alloy.","PeriodicalId":355156,"journal":{"name":"International School on Quantum Electronics: Laser Physics and Applications","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128203940","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Laser paper cleaning: the method of cleaning historical books 激光洗纸:清洗历史书籍的方法

International School on Quantum Electronics: Laser Physics and Applications Pub Date : 2017-01-05 DOI: 10.1117/12.2262426

E. Zekou, I. Tsilikas, E. Chatzitheodoridis, A. Serafetinides

{"title":"Laser paper cleaning: the method of cleaning historical books","authors":"E. Zekou, I. Tsilikas, E. Chatzitheodoridis, A. Serafetinides","doi":"10.1117/12.2262426","DOIUrl":"https://doi.org/10.1117/12.2262426","url":null,"abstract":"Conservation of cultural heritage treasures is the most important issue for transferring knowledge to the public through the next generation of students, academics, and researchers. Although this century is authenticating e-books and information by means of electronic text, still historical manuscripts as content as well as objects are the main original recourses of keeping a record of this transformation. The current work focuses on cleaning paper samples by the application of pulsed light, which is interventional. Experiments carried out using paper samples that are artificially colonized with Ulocladium chartarum. Paper is treated by Nd:YAG laser light. The available wavelength is 1064 nm, at various fluences, repetition rates and number of pulses. Two types of paper are stained with fungi colonies, which grow on substrates of clean paper, as well as on paper with ink text. The first type of paper is Whatman No.1056, which is closer to pure cellulose. The second type of paper is a page of a cultural heritage book published in 1926. Cleaning is performed using laser irradiation, thus defining the damage threshold of each sample. The treatment on paper Watman showed a yellowing, especially on areas with high concentration of fungi. The second sample was more durable to the exposure, performing the best results at higher fluences. Eventually, the paper samples are characterized, with optical microscopy and SEM/EDX analyses, prior to and after cleaning.","PeriodicalId":355156,"journal":{"name":"International School on Quantum Electronics: Laser Physics and Applications","volume":"194 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122838585","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Neutron diffraction studies of laser welding residual stresses 激光焊接残余应力的中子衍射研究

International School on Quantum Electronics: Laser Physics and Applications Pub Date : 2017-01-05 DOI: 10.1117/12.2261802

P. Petrov, G. Bokuchava, I. Papushkin, G. Genchev, N. Doynov, V. Michailov, M. Ormanova

引用次数: 1

Lidar observations of aerosol loadings extended throughout the troposphere 激光雷达对气溶胶负荷的观测扩展到整个对流层

International School on Quantum Electronics: Laser Physics and Applications Pub Date : 2017-01-05 DOI: 10.1117/12.2264235

A. Deleva, Z. Peshev, T. Dreischuh, D. Stoyanov

{"title":"Lidar observations of aerosol loadings extended throughout the troposphere","authors":"A. Deleva, Z. Peshev, T. Dreischuh, D. Stoyanov","doi":"10.1117/12.2264235","DOIUrl":"https://doi.org/10.1117/12.2264235","url":null,"abstract":"Durable aerosol/dust loadings affecting the atmosphere over the city of Sofia, Bulgaria (42.65 N, 23.38 E) were monitored by a Nd:YAG-laser-based lidar, from April to July 2009. The events lasted almost throughout the entire period. This study is only focused on the experimental results obtained on 15 and 23 April, when extraordinary in altitude (up to 15 km) aerosol layers were detected. For the two days, Dust Regional Atmospheric Model, provided by the Barcelona Super-Computing Center, had forecast Saharan dust incursions over Bulgaria. The origin of the aerosol layers detected by the lidar was identified using the Hybrid Single-Particle Lagrangian Integrated Trajectory model for calculations of the backward air-mass trajectories. The results of measurements are presented in terms of time-averaged vertical profiles of the atmospheric backscatter coefficient and color maps in height-time coordinates, which illustrate the aerosol-mass spatial distribution and its temporal evolution, within the stable layers registered. Retrieved profiles at the two lidar wavelengths (532 nm and 1064 nm) are used to calculate the corresponding profiles of the backscatter-related Ǻngström exponent as a qualitative indicator of the dominant aerosol particle size fractions in the layers observed.","PeriodicalId":355156,"journal":{"name":"International School on Quantum Electronics: Laser Physics and Applications","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125190675","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Investigating different skin and gastrointestinal tract (GIT) pathologies ex vivo by autofluorescence spectroscopy and optical imaging 利用自体荧光光谱和光学成像技术在体外研究不同的皮肤和胃肠道(GIT)病变

International School on Quantum Electronics: Laser Physics and Applications Pub Date : 2017-01-05 DOI: 10.1117/12.2261817

A. Zhelyazkova, I. Kuzmina, E. Borisova, N. Penkov, T. Genova, J. Spigulis, L. Avramov

{"title":"Investigating different skin and gastrointestinal tract (GIT) pathologies ex vivo by autofluorescence spectroscopy and optical imaging","authors":"A. Zhelyazkova, I. Kuzmina, E. Borisova, N. Penkov, T. Genova, J. Spigulis, L. Avramov","doi":"10.1117/12.2261817","DOIUrl":"https://doi.org/10.1117/12.2261817","url":null,"abstract":"The skin neoplasias are on a second place in the world statistics of cancer incidence, and gastrointestinal tract (GIT) tumours are also in the “top ten” list. For the most of cutaneous and gastrointestinal tumours could be obtained better prognoses for patients, if an earlier and precise diagnostics procedure is applied. One of the most promising approaches for development of improved diagnostic techniques, is based on optical detection, and analysis of the signatures of biological tissues for detecting the presence of pathological alterations in the investigated objects. It is important to develop and combine novel diagnostic techniques for an accurate early stage diagnosis to improve the chances for skin and GIT tumours treatment. Optical techniques are very promising methods for such noninvasive diagnosis of skin and mucosa tumours, possessing the advantages of deep imaging depth, high resolution, fast imaging speed, and noninvasive character of detection. In this study we combine autofluorescence spectroscopy and optical imaging techniques to develop more precise evaluation of the tissue pathologies investigated. We obtain chromophore maps for GIT and cutaneous samples, with better visualization of the tumours borders and margins. In addition, fluorescence spectra give us information about the early changes in chromophores’ contents into the tissues during neoplasia growth.","PeriodicalId":355156,"journal":{"name":"International School on Quantum Electronics: Laser Physics and Applications","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116206506","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Higher order solitons in non-paraxial optics 非近轴光学中的高阶孤子

International School on Quantum Electronics: Laser Physics and Applications Pub Date : 2017-01-05 DOI: 10.1117/12.2263451

D. Dakova, V. Slavchev, A. Dakova, L. Kovachev, I. Bozhikoliev

引用次数: 1

Compact micropulse backscatter lidar: airborne and ground-based applications 紧凑型微脉冲反向散射激光雷达:机载和地面应用

International School on Quantum Electronics: Laser Physics and Applications Pub Date : 2017-01-05 DOI: 10.1117/12.2261976

V. Mitev, R. Matthey, V. Makarov

引用次数: 1

Perspectives of methods of laser monitoring of the atmosphere and sea surface 大气和海面激光监测方法展望

International School on Quantum Electronics: Laser Physics and Applications Pub Date : 2017-01-05 DOI: 10.1117/12.2261356

A. Pashayev, B. Tunaboylu, M. Usta, Ilham Sadixov, K. Allahverdiyev

{"title":"Perspectives of methods of laser monitoring of the atmosphere and sea surface","authors":"A. Pashayev, B. Tunaboylu, M. Usta, Ilham Sadixov, K. Allahverdiyev","doi":"10.1117/12.2261356","DOIUrl":"https://doi.org/10.1117/12.2261356","url":null,"abstract":"Laser monitoring (remote sensing) may be considered as the science of collecting and interpreting information about the atmosphere, earth and sea using sensors on earth, on platforms in our atmosphere (airplanes, balloons) or in space (satellites) without being in direct physical contact with them. Remote sensing by LIDARs (Light Identification Detection and Ranging) has wide applications as technique to probe the Earth's atmosphere, ocean and land surfaces. LIDARs are widely used to get knowledge of spatial and temporal variations in meteorological quantities (e.g. temperature, humidity, clouds and aerosol properties) and to monitor the changes in these quantities on different timescales. Subject of the present work is quite wide. It is rather difficult to perform analysis and to provide full knowledge about existing information. In the present work, in addition to the literature data, the information will be provided also about KA-09 aerosol LIDAR developed at the Marmara Research Centre of TÜBITAK (Turkish Scientific and technological Research Council) and also about KA-14 LIDAR developed at the National Aviation Academy of Azerbaijan for remote sensing of contaminations on water surfaces taking place during oil-gas production. The main goal of this paper is to give students insight in different remote sensing instruments and techniques (including their perspectives) that are used for the derivation of meteorological quantities and obtaining the information about water surface.","PeriodicalId":355156,"journal":{"name":"International School on Quantum Electronics: Laser Physics and Applications","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127808120","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Combined opto-ultrasound method of tissue oxygenation and its application in medicine 光超声联合组织氧合方法及其在医学上的应用

International School on Quantum Electronics: Laser Physics and Applications Pub Date : 2017-01-05 DOI: 10.1117/12.2261970

M. Asimov, D. Vladimirov, A. Gisbrecht

引用次数: 0