Relevant bibliographies by topics / Theoretical lenses

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Theoretical lenses'

Author: Grafiati
Published: 4 June 2021
Last updated: 6 February 2022

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Journal articles on the topic "Theoretical lenses"

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Danaan, Victoria Voelwoen. "Analysing Poverty in Nigeria through Theoretical Lenses." Journal of Sustainable Development 11, no. 1 (January 30, 2018): 20. http://dx.doi.org/10.5539/jsd.v11n1p20.

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Various indicators suggest that poverty is a major obstacle to Nigeria’s socio-economic development. Poverty has persisted and several interventions have failed to yield significant improvement in Nigeria’s Human Development Index even in periods of economic growth. Plagued with the challenges of unemployment crises, climate change, conflict, fragility and violence, Nigeria (the most populous country in Africa) stands at a grave risk if poverty is not tackled. This paper explores seven theories of poverty in literature: The Culture of Poverty, Individual Deficiency Theory, Progressive Social Theory, Geographical Disparities Theory, Cyclical Interdependence Theory, Poverty Individualisation and the Theory of Social Exclusion /Cumulative Disadvantage. It reviews these theories by employing a qualitative and descriptive research approach in order to broaden the understanding of the complexities of the phenomenon of poverty from a global worldview and examine how these relate to the nature of poverty in Nigeria. It corroborates the fact that poverty in Nigeria is complex and multidimensional in its conceptualization and measurement, encompassing economic, social, cultural and psychological indicators. The paper therefore attempts to explore the phenomenon of poverty within the Nigerian context by examining these theoretical paradigms. It suggests an understanding of underlying causal factors of poverty in designing pro-poor programmes and a hydra-headed approach to tackle its menace effectively and progressively. It argues that poverty reduction is realizable by empowering people to develop resilience to cope and overcome it within the scope of their resources and capabilities.
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Cao, Zhe, Xianwei Shi, Erkko Autio, Jonathan Levie, and Rosemarie Ziedonis. "Entrepreneurial Ecosystems: Theoretical Lenses and Policy Challenges." Academy of Management Proceedings 2019, no. 1 (August 1, 2019): 18490. http://dx.doi.org/10.5465/ambpp.2019.18490symposium.

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WEISSMAN, BARRY A. "Theoretical Optics of Toric Hydrogel Contact Lenses." Optometry and Vision Science 63, no. 7 (July 1986): 535–38. http://dx.doi.org/10.1097/00006324-198607000-00006.

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Seife, C. "THEORETICAL PHYSICS: Offbeat Lenses Promise Perfect Fidelity." Science 290, no. 5494 (November 10, 2000): 1066a—1066. http://dx.doi.org/10.1126/science.290.5494.1066a.

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Halloin, Hubert, and Pierre Bastie. "Laue diffraction lenses for astrophysics: Theoretical concepts." Experimental Astronomy 20, no. 1-3 (September 26, 2006): 151–70. http://dx.doi.org/10.1007/s10686-006-9064-z.

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Harmancioglu, Nukhet, Cornelia Droge, and Roger J. Calantone. "Theoretical lenses and domain definitions in innovation research." European Journal of Marketing 43, no. 1/2 (February 13, 2009): 229–63. http://dx.doi.org/10.1108/03090560910923319.

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Jung, Sandy, Liam Ennis, and L. Alvin Malesky,. "Child Pornography Offending Seen Through Three Theoretical Lenses." Deviant Behavior 33, no. 8 (July 3, 2012): 655–73. http://dx.doi.org/10.1080/01639625.2011.636726.

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Janssen, Catherine, and Joëlle Vanhamme. "Theoretical Lenses for Understanding the CSR–Consumer Paradox." Journal of Business Ethics 130, no. 4 (March 1, 2014): 775–87. http://dx.doi.org/10.1007/s10551-014-2111-1.

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Zhao, Cun Hua. "Research on Silicone Zoom Lens Group to Keep Image Surface Stable." Applied Mechanics and Materials 303-306 (February 2013): 2806–10. http://dx.doi.org/10.4028/www.scientific.net/amm.303-306.2806.

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In micro lens, the adaptive lenses are potential breakout in the future. The adaptive liquid lenses had been reported in several literatures. However, it’s regret for existing adaptive liquid lenses who can’t realize zoom synchronously keeping the image surface stable. For solving the problem a pair of all-silicone lenses called lens group was put forward. The lens group was firstly fabricated and assembled. The lens group was researched from theoretical calculation to find the synchronous relation between the front lens and the back lens. At last the lens group was seriously tested including its total focal lengths and image surface drifts. The theoretical researches and the testing result testified the all-silicone lens group was possible to facilitate the adaptive lens into applications.
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Othman, Sarina, and William G. Borges. "Theoretical Lenses of Shareholder Activism and Communication: A Review." Advanced Science Letters 21, no. 6 (June 1, 2015): 1624–27. http://dx.doi.org/10.1166/asl.2015.6129.

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Dissertations / Theses on the topic "Theoretical lenses"

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Sommer, Thomas Anthony. "A theoretical and experimental study of the three-ring electrostatic electron lens." PDXScholar, 1990. https://pdxscholar.library.pdx.edu/open_access_etds/4137.

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A theoretical and experimental study of the three-ring electrostatic lens is presented. The lens consists of three isolated ring-shaped conductors, equally spaced along a common axis of symmetry. When appropriate potentials are applied to the conductors an electric field is produced near the axis which is capable of focusing a collimated beam of electrons. In the theoretical study the charge density method is used to find a closed-form solution for the field. This method approximates the field by replacing each ring with an infinitely thin hoop of uniform charge. The radial and axial equations of motion are then solved numerically, and the paraxial values of focal length, focal distance and their second order aberrations are found. In the experimental study these focal quantities are determined by a ray tracing method that uses two grids placed in the beam path outside the field of the lens. One grid is placed in front of the lens while the other is placed behind it. The shadow pattern cast by the grids is then analyzed to find the focal properties. This method, which is independent of the type of lens being investigated, is also used on a plano-convex glass lens. Comparison of the experimental and theoretical results shows satisfactory agreement in both cases.
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Braverman, Lily F. "Expanding the Theoretical Lenses of Addiction Treatment Through Art Therapy Practice." Digital Commons at Loyola Marymount University and Loyola Law School, 2015. https://digitalcommons.lmu.edu/etd/166.

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This research explores the connection and interaction between literature describing addiction theory and clinical art therapy practice. Literature spanning a wide variety of theoretical understandings of addiction and recovery was reviewed, as well as literature published on the use of art therapy with the substance abuse population. Using the review of the substance abuse literature as a base, key theoretical concepts were identified and formatted into a table that came to serve as a data coding system. Applying case study methodology, this coding system was then utilized as an analysis tool for the art therapy process and artwork of four clients in residential substance abuse treatment. Analysis of the data resulted in the emergence of five prominent themes amongst those listed in the coding system: 1) Intolerance of negative emotion 2) Problematic family dynamics 3) Traumatic experiences 4) Schemas and restructured cognitions and 5) Cultural issues. These findings were then examined in the context of the art therapy literature on substance abuse. The meanings derived from these findings make a case for greater integration between substance abuse literature and art therapy literature, illustrating the utility of clear and organized incorporation of theoretical ideas about addiction into art therapy with substance abuse clients.
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Sova, Oleksandr. "Theoretical and experimental study of tunable liquid crystal lenses : wavefront optimization." Doctoral thesis, Université Laval, 2020. http://hdl.handle.net/20.500.11794/67581.

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Adaptive optical systems have applications in various domains: imaging (zoom and autofocus), medicine (endoscopy, ophthalmology), virtual and augmented reality. Liquid crystal-based lenses have become a big part of adaptive optics industry as they have numerous advantages in comparison with traditional methods. Despite significant progress made over the past decades, certain performance and production limitations still exist. This thesis explores ways of overcoming these problems, considering two types of tunable lenses: liquid crystal lens using dielectric dividing principle and modal control lens.The introduction of this thesis presents the theory of liquid crystals and adaptive lenses, addressing existing liquid crystal lenses as well.In the first and second chapters of this work we demonstrate the results of theoretical modeling of double dielectric optically hidden liquid crystal lens design. We have studied the influence of geometrical parameters, such as thickness of liquid crystal cell, shape and dimensions of dielectrics forming the optically hidden layer, on the optical power of the lens. The dependences of optical power on the relative permittivity and conductivity of dielectrics were obtained. The behavior of such a lens in the presence of temperature variation was analyzed. We have further extended the concept of hidden dielectric layer to exploration of microstructures. Two systems of microlenses and microprisms have been simulated. The comparison of optical phase modulation dependence on spatial frequency of microstructures was obtained. Deviations from ideal wavefronts were evaluated in both cases. We also compared proposed designs with a standard interdigital electrode approach. Suggested devices could be used for continuous light steering or as tunable microlens arrays. In the third and fourth chapters we present our studies of tunable lenses based on modal control principle. We verified simulation results by comparing them with experimentally obtained dependences of optical power and root mean square spherical aberrations. We have explored the following modifications of conventional modal control lens: 1) additional powered ring electrode; 2) floating disk electrode; 3) combination of the first two cases. The influence of each modification was studied and explained. Simulation results showed that using the combination of additional electrodes along with optimal powering technique -the wavefront could be corrected within the entire clear aperture of the lens. Modified lens meets low aberration requirements for ophthalmic applications (for example,intraocular implant). Finally, a new design of a wide aperture tunable modal control Fresnel lens was investigated. Imaging performance of the proposed Fresnel lens was evaluated and compared with the reference lens built using traditional modal control approach. The prototype device demonstrated the increase of optical powerin comparison with a conventional modal control lens of the same aperture size. A theoretical model and numerical simulations of the Fresnel lens design were presented. Simulations demonstrated a possibility of noticeable image quality improvement obtained using optimized voltages and frequencies.
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Röckemann, Jan-Hendrik [Verfasser], and Jens [Akademischer Betreuer] Osterhoff. "Experimental and Theoretical Studies on Electron-Beam Focusing Using Active Plasm Lenses / Jan-Hendrik Röckemann ; Betreuer: Jens Osterhoff." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2020. http://d-nb.info/1212180895/34.

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Iacovetta, Anna C. "Moving Up the Social Ladder: An Analysis of the Role of Temptation in Shaping Characters in Select Fairy Tales Employing Marxist and Psychological Lenses." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1491073505893036.

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Shandor-Bruce, Deborah S. "Make Magic: The nexus of select curriculum studies projects in critical theory and Bakhtin’s literary theory of carnival as theoretical lenses to examine intertextuality, the interplay of text and lived experiences, in a ten year study of one child&." Kent State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=kent1351187596.

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Aysegul, Alayat. "Rental Housing Policy Norms in Stockholm Through A Queer Theoretical Lense." Thesis, KTH, Urbana och regionala studier, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-176476.

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Swedish Instrument of Governance and Housing Sustention Responsibility state that everyone living in Stockholm County has the right to housing. This thesis deals with norms created by the first-, second-hand rental market and priority housing rules and regulations in the Stockholm County. Using a queer theoretical framework this thesis analyses the situation of young adults and students, elderly, homeless, LGBTQ and abused persons in housing market in relation to “housing for all” policy and suggests possible policy changes in order to make the rental housing market more inclusive. Queer theory asserts that subjects are precisely constituted by the existing power structures through socio-political arrangements that are based on assumptions. Urban planning by its nature also uses assumptions therefore it also reproduces accepted truths and risks generalizing heterogeneous social groups’ needs, these generalizations might also create cases that are insensitive to personal needs. According to queer theory identities change over time and individuals can belong to more than one category simultaneously and therefore rental housing market requires having awareness of fluidity. This study by using the queer theoretical framework, analyzes the situation of young adults and students, elderly, homeless, LGBTQ and abused persons in Stockholm’s rental housing market by using stories, interviews, policy documents, reports and statistical data to clarify how accepted truths/norms effects the constitution of housing categories, and how these housing categories, for that matter norms that are created by rules and regulations, exclude/include different social groups from the rental housing market. In order to fulfil the laws for “housing for all”, there is a need for more affordable rental housing units as well as regulation luxury renovations, supporting research that is related to housing prices and so on. The laws can also be fulfilled by changing in the norm for rental housing tenants; this can be done decreasing the demands for being eligible tenants including requirement on income for regular queue and requirement of study phase of 50 percent for students. For the second-hand rental housing there is a need of a system that minimizes possible discrimination, a database of accessible housing units could help those that need accessibility issue solved and a wider variety with a bigger housing stock for homeless could benefit homeless that want to change their realities. Concerning usage of housing stock in Stockholm, policy changes like “kompis kontrakt” make it possible to use the existing rental housing stock more efficiently. The conclusions of this study shows that the requirements set by the rules and regulations on first-hand rental housing excludes individuals that have record of non-payment related to housing, an income that is lower than the total of the monthly rent and 4 675 SEK, and that are not credit worthy. For many including homeless sensitiveness to personal needs are critical. The results show that there is number of shelters in Stockholm County is insufficient and the aid given by the social services to shelters reproduces gender binaries through laws.
Sveriges grundlag samt Bostadsförsörjninglag fastslår att alla boende i Stockholms län har rätt till bostad. Denna uppsats berör de normer som skapats av första- och andrahandsuthyrning på bostadsmarknaden samt regler om förtur i Stockholms län. Med ett queerteoretiskt ramverk analyserar denna uppsats situationen för unga unga vuxna och studenter, äldre, hemlösa, LBGTQ samt misshandlade personer i behov av skydd på bostadsmarknaden i relation till principen om "bostad för alla" och föreslår möjliga policyförändringar med syfte att att göra hyresmarknaden mer inkluderande.  Queerteori menar att subjekt är precist skapade av befintliga maktstrukturer genom sociopolitiska uppställningar baserade på antaganden. Även stadsplanering använder genom sin natur antaganden och reproducerar på detta sätta accepterade sanningar och riskerar på detta sätt att generalisera behoven hos heterogena sociala grupper. Dessa generaliseringar kan även skapa scenarion okänsliga för personliga behov. Enligt queerteori ändras identiteter över tid och individer kan tillhöra mer än en kategori samtidigt varför hyresmarknaden fordrar medvetenhet om denna fluiditet.  Denna studie undersöker bostadssituationen i Stockholm för unga vuxna, studenter, pensionärer, hemlösa, HBTQ och utsatta personer, ur ett queerteoretiskt perspektiv. Genom metoder som berättelser, intervjuer, dokument, rapporter och statistik är syftet att klargöra hur vedertagna sanningar och normer ligger till grund för boendekategorier, och hur dessa boendekategorier utesluter eller inkluderar olika sociala grupper från hyresmarknaden. För att nå målet ”bostad åt alla”, behövs prisvärda hyresrätter, åtstramning/minskning av renovering av lyxlägenheter samt forskning kring hyressättning, och så vidare. Lagarna kring ”bostad åt alla” kan även följas genom att ändra på normen för hyresvärden, bland annat genom att minska på kraven för vem som anses vara en lämplig hyresgäst (och stå i bostadskö) på basis av sin inkomst samt minimum 50 procent studiefart för studenter. När det gäller andrahandsuthyrning finns ett behov av att minska risken för diskriminering. En möjlig lösning är en databas med lediga lägenheter som finns tillgängliga för de som är i behov av tillgänglighetslägenheter och således nå grupper som, tex hemlösa, som vill ändra sina levnadsförhållanden. Ytterligare en lösning är möjligheten till ”kompiskontrakt” som skulle göra utnyttjandet av hyresbeståndet mer effektivt. Denna studie visar att reglerna kring förstahandskontrakt utesluter vissa individer/grupper som har ett förflutet av att inte kunna betala hyran, lägre inkomst än den totala månadshyran eller som inte är kreditvärdiga. Särskild hänsyn bör därför tas till många gruppers, även hemlösas personliga situation. Resultaten från denna studie visar även att antalet härbärgen i Stockholms län är för få och att Socialstyrelsens bidrag till dessa reproducerar könsbinärer.
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Latry, Olivier. "Théorie des modes locaux dans les guides perturbés application : couplage fibre optique - photodiode PIN." Rouen, 1995. http://www.theses.fr/1995ROUE5001.

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La réduction des dimensions des composants optoélectroniques constitue une contrainte importante pour un couplage optimal avec la fibre optique. Le but recherché étant de focaliser le maximum de lumière à l'intérieur de la couche intrinsèque de la photodiode, il faudrait donc envisager de réduire le diamètre de la fibre optique. Une étude du bout de la fibre est également menée et montre que pour une forme lentillée appropriée, il est possible d'adapter la distribution d'énergie entre fibre optique et photodiode. Le calcul du champ le long de ce guide de dimensions lentement décroissantes utilise la méthode des modes locaux. Cette méthode est employée car il n'y a pas de solutions exactes aux équations de Maxwell. En réalité, le champ total est la superposition des champs locaux et du champ radiatif. Les pertes d'énergie le long de ce guide sont analysées avec la théorie du couplage des modes locaux. On obtient alors un bilan le long de ce guide que l'on cherche à optimiser. La comparaison de ces résultats avec la simulation numérique quasi 3 D de la propagation optique guidée sur ALCOR est également réalisée. Ceci permet de définir la structure la mieux adaptée pour un couplage optimum entre la fibre et le composant
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DiLorenzo, Michael E. "Looking at substance use disorders through lenses of self psychology and existential psychotherapy a theoretical study : a project based upon an independent investigation /." 2009. http://hdl.handle.net/10090/9852.

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Cheng, Chieh-Jen, and 鄭介任. "Diffraction Theoretic Study on Vectorial Beams and Split Lenses." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/18397223703377591499.

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博士
國立交通大學
光電工程學系
99
This study examines the diffraction properties of the generalized split N-sector lens originating from the configuration of Meslin’s experiment and the Billet’s split bi-sector lens. In Billet’s N-split lens, the type of lens splitting selected causes the interference pattern of equidistant straight lines in the original Billet’s lens to form an N-fold angularly distributed pattern with an angle difference of 2π/N. For an odd number of splitting N, there is an additional angle shift of π/N for the azimuthally distributed patterns of equidistant straight lines. In other words, there are two kinds of symmetry even for simple splitting operations. On the other hand, the peak intensity distribution in the central portion resembles a concentric-circle-like pattern, when N is large as a result of N-beam interference. As to the Meslin’s N-split lens, the amplitude and the phase follow and respectively when the splitting is with double of an even number. On the other hand, for the case of double of an odd number, the relation changes to hold with and , where the optical units u and v are used to denote the z- and the radial coordinates respectively and the azimuthal angle is ψ. Additional symmetry properties are also explored and identified, particularly for the distributions on the focal plane. Moreover, the Bessel beam is studied and by the use of the Billet’s N-split lens distributing the focal points circularly on the focal plane. This study explores the characteristics of beam propagation and analytically derives the asymptotic characteristics of beam propagation based on the stationary phase approximation and the moment-free Filon-type method. Results show that the unique Billet’s N-split lens can generate a quasi-Bessel beam if the number of splitting N is large enough, e.g., N≧24. This study also explores the diffraction efficiency of corresponding quasi-Bessel beam and the influence of aperture size. The potential advantage of proposed split-lens approach is that, unlike the classical means of annual aperture, this simple lens approach allows a much large throughput in creating the Bessel beam and hence the Bessel beam could have more optical energy. The diffraction behaviors of cylindrical vector beam, particularly the focal shifts further caused by different polarizations, namely linear, radial and azimuthal, are also investigated. The variation of focal shifts associated with numerical aperture and the Fresnel number is also explored. It is found that with a low numerical aperture, e.g., 0.1, the focal shifts associated by the radially and azimuthally polarized illuminations are nearly the same, while they are about 1.65 times as large as that of linearly polarized illumination. As the system is of high numerical aperture, e.g., 0.9, the focal shifts associated by the radially and azimuthally polarized illuminations have ~10% difference and their ratios with that of linearly polarized illumination become double in comparing with the case of low numerical aperture. In general, azimuthally polarized illumination has the largest power in shifting the focal point.
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Books on the topic "Theoretical lenses"

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Mahler, Julianne. Agency Learning (Theoretical Lenses on Public Policy). Westview Pr (Short Disc), 2005.

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Mahler, Julianne. Agency Learning (Theoretical Lenses on Public Policy). Westview Pr (Short Disc), 2004.

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Sabatier, Paul A. Theories of the Policy Process (Theoretical Lenses on Public Policy). Westview Press, 1999.

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Sigler, Jay A., and Richard A. Harris. Government, Business, and American Politics (Theoretical Lenses on Public Policy). The Perseus Books Group, 1998.

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Sabatier, Paul A. Theories of the Policy Process (Theoretical Lenses on Public Policy). Westview Press, 1999.

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Sigler, Jay A., and Richard A. Harris. Government, Business and American Politics (Theoretical Lenses on Public Policy). Westview Press Inc, 1998.

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Hodge, Graeme A. Privatization: An International Review of Performance (Theoretical Lenses on Public Policy). Westview Press, 1999.

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Privatization: An International Review of Performance (Theoretical Lenses on Public Policy). Westview Press, 1999.

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Sabatier, Paul A. Policy Change and Learning: An Advocacy Coalition Approach (Theoretical Lenses on Public Policy). Westview Press, 1993.

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Policy Change and Learning: An Advocacy Coalition Approach (Theoretical Lenses on Public Policy). Westview Press, 1993.

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Book chapters on the topic "Theoretical lenses"

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Verhoest, Koen, Paul G. Roness, Bram Verschuere, Kristin Rubecksen, and Muiris MacCarthaigh. "Theoretical Lenses." In Autonomy and Control of State Agencies, 29–44. London: Palgrave Macmillan UK, 2010. http://dx.doi.org/10.1057/9780230277274_3.

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Bernardeau, Francis. "Gravitational Lenses." In Theoretical and Observational Cosmology, 179–209. Dordrecht: Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-011-4455-1_4.

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Foster, Simon, Frank Zeyda, and Jim Woodcock. "Unifying Heterogeneous State-Spaces with Lenses." In Theoretical Aspects of Computing – ICTAC 2016, 295–314. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-46750-4_17.

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Torres, Carlos Alberto. "Theoretical Lenses to View Socio-Environmental Issues." In Educating the Global Environmental Citizen, 93–145. New York : Routledge, 2018. | Series: Critical global citizenship education ; 2: Routledge, 2017. http://dx.doi.org/10.4324/9781315204345-4.

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Halloin, Hubert, and Pierre Bastie. "Laue diffraction lenses for astrophysics: Theoretical concepts." In Focusing Telescopes in Nuclear Astrophysics, 151–70. Dordrecht: Springer Netherlands, 2006. http://dx.doi.org/10.1007/978-1-4020-5304-7_17.

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Dhamo, Sotir. "Additional Theoretical Lenses to Understand the City." In Understanding Emergent Urbanism, 31–44. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-82731-1_3.

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Endsley, T. C., G. A. Macht, D. Engome Tchupo, C. Hammett, and J. R. S. Brownson. "Lenses of Diversity in Distributed Teams." In Foundations and Theoretical Perspectives of Distributed Team Cognition, 209–26. First edition. | Boca Raton : CRC Press, 2020.: CRC Press, 2020. http://dx.doi.org/10.1201/9780429459795-9.

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Windsor, Duane. "Theoretical Lenses and Conceptual Models for Understanding Public Affairs." In The SAGE Handbook of International Corporate and Public Affairs, 40–54. 1 Oliver's Yard, 55 City Road London EC1Y 1SP: SAGE Publications Ltd, 2017. http://dx.doi.org/10.4135/9781473947391.n3.

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Buchholtz, Nils. "The Eyes to See: Theoretical Lenses for Mathematical Modelling Research." In International Perspectives on the Teaching and Learning of Mathematical Modelling, 101–6. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-6540-5_8.

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Clarke, David. "Reaction to Section 1: Faith, Hope and Charity: Theoretical Lenses on Affect." In From beliefs to dynamic affect systems in mathematics education, 119–34. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-06808-4_6.

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Conference papers on the topic "Theoretical lenses"

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Sallam, Ahmed, Vamsi Chandra Meesala, and Shima Shahab. "Theoretical and experimental investigations on metallic acoustic lenses." In Active and Passive Smart Structures and Integrated Systems XV, edited by Jae-Hung Han, Shima Shahab, and Gang Wang. SPIE, 2021. http://dx.doi.org/10.1117/12.2583141.

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Hornung, Thorsten, and Peter Nitz. "Optical loss due to diffraction by concentrator Fresnel lenses." In 3RD INTERNATIONAL CONFERENCE ON THEORETICAL AND APPLIED PHYSICS 2013 (ICTAP 2013). AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4897029.

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Melnik, I. V., and A. O. Luntovsky. "On-line distance learning system to study theory of magnetic lenses electron optics." In Problems of Theoretical and Applied Electron and Ion Optics, edited by Anatoly M. Filachev. SPIE, 2003. http://dx.doi.org/10.1117/12.497999.

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Liu, Mingguo, Will Bagienski, Robert Gordon, Adam Plesniak, and Vahan Garboushian. "Field performance analysis of different Fresnel lenses in Amonix CPV systems." In 3RD INTERNATIONAL CONFERENCE ON THEORETICAL AND APPLIED PHYSICS 2013 (ICTAP 2013). AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4897032.

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Soto-Bernal, J. J., and A. Bonilla-Petriciolet. "Theoretical analysis of auto stability in laser resonators with thermal lenses effect." In Fifth Symposium, edited by Eric Rosas, Rocío Cardoso, Juan C. Bermudez, and Oracio Barbosa-García. SPIE, 2006. http://dx.doi.org/10.1117/12.674673.

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Yan, Hanfei, Jorg Maser, Hyon Chol Kang, Albert Macrander, and Brian Stephenson. "A theoretical study of two-dimensional point focusing by two multilayer Laue lenses." In Optical Engineering + Applications, edited by Shunji Goto, Ali M. Khounsary, and Christian Morawe. SPIE, 2008. http://dx.doi.org/10.1117/12.795721.

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Vallejo Melgarejo, Laura Daniela, Jose García, Ronald G. Reifenberger, and Brittany Newell. "Manufacture of Lenses and Diffraction Gratings Using DLP As an Additive Manufacturing Technology." In ASME 2018 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/smasis2018-7963.

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This document condenses the results obtained when 3D printing lenses and their potential use as diffraction gratings using Digital Light Processing (DLP), as an additive manufacturing technique. This project investigated the feasibility of using DLP additive manufacturing for producing custom designed lenses and gratings. DLP was identified as the preferred manufacturing technology for gratings fabrication. Diffraction gratings take advantage of the anisotropy, inherent in additive manufacturing processes, to produce a collated pattern of multiple fringes on a substrate with completely smooth surfaces. The gratings are transmissive and were manufactured with slit separations of 10, 25 and 50 μm. More than 50 samples were printed at various build angles and mechanically treated for maximum optical transparency. The variables of the irradiance equation were obtained from photographs taken with an optical microscope. These values were used to estimate theoretical irradiance patterns of a diffraction grating and compared against the experimental 3-D printed grating. The resulting patterns were found to be remarkably similar in amplitude and distance between peaks when compared to theoretical values.
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Scholz, P., U. Kerst, C. Boit, T. Kujawa, and T. Lundquist. "Instant Solid Immersion Lens Creation in Silicon with a Focused Ion Beam – Comparing Refractive and Diffractive Methods." In ISTFA 2011. ASM International, 2011. http://dx.doi.org/10.31399/asm.cp.istfa2011p0046.

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Abstract The theoretical fundamentals of diffractive solid immersion lenses (dSILs) were revised and adapted to a new application: the direct single-step chemistry-assisted creation of binary dSILs in silicon with a focused ion beam (FIB). Current results were able to prove the general functionality of this technique, but also showed the limitations still present. These limitations were identified; the underlying problems were analyzed and were addressed by optimizing several aspects of the process. The presented dSIL has a diameter of 150 ìm and is created in 15 minutes of processing time. It is designed for a sample thickness of 70 µm, which can be well adjusted if needed. For this sample thickness, the theoretical numerical aperture is about 2.5, offering a significant improvement in resolution. Furthermore a comparison of diffractive and refractive solid immersion lenses is presented, both created in a similar process. Apart from general aspects of dSILs and rSILs (refractive SILs), details of the designs presented in this work are compared. This leads to the insight of which method (dSIL or rSIL) has its advantages for which type of application.
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Song, Chaolong, Nam-Trung Nguyen, and Anand Krishna Asundi. "Modeling and Characterization of Micro Optofluidic Lenses With Short Focal Length." In ASME 2009 7th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2009. http://dx.doi.org/10.1115/icnmm2009-82048.

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In this paper, fluidic models of liquid-core liquid-cladding lens formed in a circular chamber are reported. The models cover two cases: the circular chamber is symmetrical and asymmetrical to the channel axis. Experiments were also carried out to verify our models. The results agree well with the theoretical analysis. The test device with a circular lens chamber with 1-mm diameter and 100-μm height was fabricated in PDMS. The design of a circular chamber is demonstrated to develop a perfect arc shape of the lens interface, which can be mathematically pre-defined. The focusing abilities of lens formed in these two different geometries are compared. We found that the asymmetrical design, in which the channel is offseted from the axis of chamber, can develop a lens with shorter focal length. This design has an important significance for on-chip focusing.
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Bown, Mark R., Jordan M. MacInnes, and Ray W. K. Allen. "Complete Micro-PIV Characterisation of Microfluidic Devices." In ASME 3rd International Conference on Microchannels and Minichannels. ASMEDC, 2005. http://dx.doi.org/10.1115/icmm2005-75041.

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Microfluidic devices can take advantage of novel physics only available at the micro-scale. As a result, new physical models for the flow behaviour within these devices are required. In recent years micron resolution particle image velocimetry (Micro-PIV) has established itself as a reliable verification tool for these models. Micro-PIV measures the velocity profile across a single 2D plane within a microfluidic device. Here, Micro-PIV data is obtained from several planes within a device to create a complete mapping of the flow field. Combination of the data from all the planes allows the flow profile on the plane perpendicular to the original images to be studied and the volumetric flowrate through the device to be measured. By fitting the measured velocities to known flow profiles, the width and depth of the device can also be measured with sub micron precision. The technique is applied to an isotropically etched microchannel, where the results are compared to an independent computational fluid dynamics solution. Good agreement is found between the two data sets. The technique is then demonstrated in a more complex flow in a mixing channel device. In order to image an entire device a large field of view may be required. This dictates the use of low magnification lenses, which in turn have a large depth of field. A theoretical model for the measured Micro-PIV velocity demonstrates that, if care is taken when measuring near to curved walls, the use of these low magnification lenses does not significantly reduce the quality of the data obtained.
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Reports on the topic "Theoretical lenses"

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Sommer, Thomas. A theoretical and experimental study of the three-ring electrostatic electron lens. Portland State University Library, January 2000. http://dx.doi.org/10.15760/etd.6020.

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Le Maux, Laurent. Bagehot for Central Bankers. Institute for New Economic Thinking Working Paper Series, February 2021. http://dx.doi.org/10.36687/inetwp147.

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Walter Bagehot (1873) published his famous book, Lombard Street, almost 150 years ago. The adage “lending freely against good collateral at a penalty rate” is associated with his name and his book has always been set on a pedestal and is still considered as the leading reference on the role of lender of last resort. Nonetheless, without a clear understanding of the theoretical grounds and the institutional features of the British banking system, any interpretation of Bagehot’s writings remains vague if not misleading—which is worrisome if they are supposed to provide a guideline for policy makers. The purpose of the present paper is to determine whether Bagehot’s recommendation remains relevant for modern central bankers or whether it was indigenous to the monetary and banking architecture of Victorian times.
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Equal Cities : IIHS Annual Research Conference Proceedings. Indian Institute for Human Settlements, 2020. http://dx.doi.org/10.24943/9789387315655.

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Urban ARC is the Annual Research Conference of the Indian Institute for Human Settlements (IIHS). The fourth edition of Urban ARC, ‘Equal Cities’, focussed on the conceptual, theoretical and practical understanding of notions of equality and equity in the context of a rapidly urbanising world. Panels engaged with the idea of equity and equality through a range of lenses, across theory and praxis, across geographical and spatial contexts, and discipline and methodologies. The conference was held from 16 to 18 January 2020 at the IIHS Bengaluru City Campus. These Conference Proceedings feature the extended abstracts submitted by the selected participants for Urban ARC 2020.
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