8,070 research outputs found
Dan gen na mi xian de zhu xiang ju yu de guang xue xing zhi
No full textZhuang, Junping = 單根納米線的軸向局域的光學性質 / 庄俊平.Thesis (M.Phil.)--Chinese University of Hong Kong, 2011.Includes bibliographical references.Abstracts in English and Chinese.Zhuang, Junping = Dan gen na mi xian de zhu xiang ju yu de guang xue xing zhi / Zhuang Junping.Acknowledgement --- p.IAbstract --- p.II摘要 --- p.IVContents --- p.iList of Figures --- p.ivList of Tables --- p.viiiAbbreviations --- p.ixChapter Chapter 1 --- Introduction --- p.1Chapter 1.1 --- Background --- p.1Chapter 1.2 --- ZnSe Semiconductor Nanowires --- p.2Chapter 1.3 --- Carrier Dynamics in Semiconductor Nanowires --- p.3Chapter 1.3.1 --- Carrier Relaxation --- p.3Chapter 1.3.2 --- Surface Effects on Carrier Recombination --- p.7Chapter 1.4 --- Principle ofTCSPC Technique --- p.9Chapter 1.5 --- Motivations and Works --- p.10References --- p.12Chapter Chapter 2 --- Experiments --- p.17Chapter 2.1 --- Growth of ZnSe Nanowires --- p.17Chapter 2.2 --- Measurements with Electron Microscopes --- p.17Chapter 2.3 --- Measurements by a Laser Scanning Microscope --- p.18Chapter 2.3.1 --- Experimental Setup --- p.18Chapter 2.3.2 --- Settings of Measurements --- p.23References --- p.25Chapter Chapter 3 --- Methods of Analysis --- p.26Chapter 3.1 --- Luminescence Intensity --- p.26Chapter 3.1.1 --- Intensity Detected by PMT --- p.27Chapter 3.1.2 --- Intensity Detected by SPAD --- p.28Chapter 3.2 --- Lifetime Histogram --- p.29Chapter 3.2.1 --- Pixel Binning --- p.29Chapter 3.2.2 --- Lifetime Fitting --- p.32References --- p.33Chapter Chapter 4 --- Results and Discussion --- p.34Chapter 4.1 --- "Morphology, Structure and Composition of As-Grown Nanowires" --- p.34Chapter 4.2 --- Cathodoluminescence of Individual ZnSe Nanowires --- p.36Chapter 4.3 --- Photoluminescence of ZnSe Nanowires --- p.36Chapter 4.4 --- Luminescence of Individual Nanowires --- p.39Chapter 4.4.1 --- Luminescence of As-Grown Nanowires --- p.39Chapter 4.4.2 --- Nonlinear Optical Properties --- p.42Chapter 4.5 --- Luminescence Lifetimes of Individual Nanowires --- p.47Chapter 4.5.1 --- Power Dependence --- p.48Chapter 4.5.2 --- Chemical Environments --- p.53Chapter 4.5.3 --- Concentration of Ammonium Sulfide Solution --- p.56Chapter 4.6 --- Axially Resolved Luminescence Lifetimes --- p.60Chapter 4.6.1 --- Axially Resolved 2D Decay Diagrams --- p.60Chapter 4.6.2 --- Axially Resolved Luminescence Lifetimes --- p.62Chapter 4.6.3 --- (TNBE) and T1 of DL Emission --- p.69References --- p.72Chapter Chapter 5 --- Conclusions --- p.76Appendix A --- p.79Chapter A.1 --- Laser Beam Diameter and Spatial Resolution --- p.79Chapter A.2 --- Instrument Response Function of TCSPC module --- p.81Chapter A.3 --- Photo-Injection --- p.82Chapter A.3.1 --- Two-Photon Excitation by Pulse Laser --- p.82Chapter A.3.2 --- One-Photon Excitation by CW UV Laser --- p.84Chapter A.4 --- Lifetime Distributions --- p.85References --- p.86Appendix B Supporting Data --- p.8
A GaAs-based hybrid integration of a tunneling diode and a 1060-nm semiconductor laser
No full textWe report on a hybrid integrated tunneling diode, with a simple structure, and a quantum well laser diode, lasing at ~1060 nm, on GaAs substrate. The low-frequency operation of the integrated circuit was measured and obvious negative differential resistance regions were shown in the electrical and optical output. The electrical and optical bistability were measured, and the peak and valley voltage were 2.03 and 2.17 V, respectively. A 140-mV-wide hysteresis loop and an optical on/off ratio of 21 dB were obtained. The device has potential applications in biomedicine and optical interconnects
Marknadsföring av kurser inom fria bildningen : Utvecklande av en hemsida för sykurser i Pedersöre MI
No full textFöreliggande examensarbete omfattar utarbetande av en hemsida som marknadsföringskanal för sykurser i Pedersöre MI. Syftet var att denna kanal skulle ge flera kursdeltagare samt behålla de tidigare kursdeltagarna. Som uppdragsgivare fungerade Åsa Nyberg-Sundqvist, rektor på Pedersöre MI.
Som teoridelar i arbetet gjordes definition och beskrivning av marknadsföring och traditionella och digitala marknadsföringskanaler, samt av skillnaderna mellan dessa. Fria bildningen och medborgarinstitutens verksamhet generellt, samt skapande av en hemsida, beskrevs som teoridelar i detta arbete. Skapande av en hemsida beskrevs som bakgrund till det praktiska arbetet, utvecklandet av en hemsida.
Som metod användes intervju med intervjuguide för beskrivning av marknadsföring med betoning på marknadsföringskanaler inom Pedersöre MI 2002 – 2021. Som bakgrund och forskningsmetoder till teoridelarna samt utvecklande av hemsidan låg litteraturstudier, nätstudier via webbsökning samt egen fortbildning i digital kompetens för undervisning inom fria bildningen.
Vid utvecklandet av hemsidan testades och jämfördes två olika digitala verktyg för att erhålla den optimala hemsidans utseende och användning för sykurser i Pedersöre MI. Det praktiska skapandet av hemsidan beskrevs och resultatet diskuterades samt förslag gavs för uppdragsgivaren om hemsidan som en digital marknadsföringskanal för sykurser i Pedersöre MI.This thesis includes developing a website as a digital marketing channel for the sewing courses in Pedersöre Adult Education Centre. The aim was to get more participants to the sewing courses and encourage the current participants to continue participating. Åsa Nyberg–Sundqvist, principal of Pedersöre Adult Education Centre, was acting as the supervisor.
A description of marketing and traditional and digital marketing channels and the distinction between those were included in the theoretical part. A description of the liberal adult education and Adult Education Centre in general as well as developing of website were presented as theoretical parts in this thesis. The marketing of Pedersöre Adult Education Centre during 2002-2021 was described by two interviews. The theory on creating websites worked as a background to the practical part and the development of the website for the commissioner.
As research method on the marketing of Pedersöre Adult Education Centre an interview with interview guide were made. As background and research methods for the developing of the website were used different literature studies, web searches and the author´s continuing education in digital competences for teaching in liberal adult education. During the developing of the website two different digital website programs and tools were tested and compared, to get the most optimized look and use for sewing courses in Pedersöre Adult Education Centre.
The thesis resulted in a website for sewing courses in Pedersöre Adult Education Centre. The process of developing the website and the result were discussed and suggestions for future marketing were given to the commissioner
Selective Area Growth of GaAs in V-Grooved Trenches on Si(001) Substrates by Aspect-Ratio
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UnBoxing the MI Box: A study on how to transfer from monitoring to coaching with the MI Box to increase self-care activities
No full textProblem Background:Cardiovascular disease (CVD) is the most common cause of death in the world (Johnston et al., 2016). One of the main causes for cardiovascular mortality is a myocardial infarction (MI) (Jneid et al., 2013; Mishra & Ramavataram, 2021; Verburg et al., 2019). A myocardial infarction is an event in which the heart muscle is damaged because of a complete or partial absence of oxygen supply (Mishra & Ramavataram, 2021)The healthcare system is pressured by the enormous number of CVD cases (Kaushik et al., 2020). Digital care has gained recognition in the past decade because of its potential to release some pressure from the healthcare system. With the potential of digital care in mind, Leiden University Medical Center (LUMC) has developed a concept called “The MI Box” which provides patients who have had an MI with self-monitoring devices (The Box, 2021). During the hospitalisation phase of the MI care trajectory, there is little time to involve patients in their care because healthcare professionals (HCPs) need to work as quickly as possible to avoid as much heart damage as possible. This is causing patients to have a bad discharge experience. The MI Box shows potential to involve patients more after the discharge as the concept shows the monitored values to patients. However, it can be difficult for patients to understand these values and how to use them for self-care activities, especially because of the little involvement during hospitalisation. If LUMC wants to satisfy its aim to change from monitoring to coaching, it is crucial to provide patients with enough support to work with their monitored values and perform self-care activities. Increasing patient involvement is an essential first step before shared decision making (SDM) can be realised. SDM is a suitable approach for the change towards coaching as it invites patients to make their own care choices. In the MI care trajectory, the implementation of SDM is currently lacking. Therefore, further analysis of SDM is needed. A tool that is valuable for the analysis and increasement of SDM, and which is used in this thesis, is the Metro Mapping tool (Metro Mapping, n.d.). Besides, because the MI Box causes care to be transferred to a patient’s home environment, it is necessary to consider the home context of a patient as care activities do not happen in a controlled hospital environment. Currently, little is known about the context in which the MI Box is used. Therefore, more knowledge about the context is necessary to consider what support means would be suitable to offer to patients to make them more empowered to perform self-care activities.Research Question:How to shift from monitoring to coaching with the MI Box?Research activities:-Literature research;-Interviews: HCPs (n=5), MI patients (n=4), MI Box users (n=2);-Context mapping;-Metro Mapping.Design Goal:The goal is to increase patients’ confidence to perform self-care activities by increasing patients’ involvement and guidance with the use of the MI Box.Final Concept:“UnBoxing the MI Box”Design for Interaction | Medisig
A hybrid single-mode laser based on slotted silicon waveguides
No full textAn InGaAsP-Si hybrid single-mode laser based on etched slots in silicon waveguides was demonstrated operating at 1543 nm. The InGaAsP gain structure was bonded onto a patterned silicon-on-insulator wafer by selective area metal bonding method. The mode-selection mechanism based on a slotted silicon waveguide was applied, in which the parameters were designed using the simulation tool cavity modeling framework. The III-V lasers employed buried ridge stripe structure. The whole fabrication process only needs standard photolithography and inductively coupled plasma etching technology, which reduces cost for ease in technology transfer. At room temperature, a single mode of 1543-nm wavelength at a threshold current of 21 mA with a maximum output power of 1.9 mW in continuous-wave regime was obtained. The side mode suppression ratio was larger than 35 dB. The simplicity and flexibility of the fabrication process and a low cost make the slotted hybrid laser a promising light source
A directional-emission 1060-nm GaAs/InGaAs microcylinder laser
No full textA GaAs/InGaAs microcylinder laser in diameter of 15 μm connected with a 2-μm wide output waveguide is fabricated using standard photolithography and inductively coupled plasma etching technique. With the output waveguide, we realize the directional emission with the pulsed lasing operation wavelength of 1060 nm at room temperature. The maximum output power is ~6 μW and the minimum threshold current is 2 mA, which is comparatively low compared with previous reported GaAs material microlasers. A single mode operation is achieved near threshold current at the wavelength of 1060 nm. Mode characteristics are calculated and analyzed by 2-D finite-difference time-domain simulation. The small volume, low threshold current, and low energy consumption make the GaAs/InGaAs microcylinder laser we presented a promising light source for optical interconnection on chip
SOBRE MI TRADUCCIÓN DE “SER Y TIEMPO”
No full textIn this article the author develops his own idea of a translation and explains the solutions given to problems arisen in the translation of Heidegger’s Being and Time.Este escrito pretende dos cosas: primero, desarrollar brevemente mi propia idea de lo que es traducir, y, segundo, explicar la solución que di a ciertos problemas que surgieron en mi traducción de la obra Ser y Tiempo de Heidegger
Sobre mi traducción de “Ser y Tiempo”
No full textIn this article the author develops his own idea of a translation and explains
the solutions given to problems arisen in the translation of Heidegger’s Being
and TimeEste escrito pretende dos cosas: primero, desarrollar brevemente mi propia
idea de lo que es traducir, y, segundo, explicar la solución que di a ciertos
problemas que surgieron en mi traducción de la obra Ser y Tiempo de
Heidegge
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