Tesis sobre el tema "Compact clock"
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GOZZELINO, MICHELE. "Pulsed rubidium clock towards space applications". Doctoral thesis, Politecnico di Torino, 2020. http://hdl.handle.net/11583/2836782.
Texto completoBomstad, Wayne Roger. "An ultra-compact antenna test system and its analysis in the context of wireless clock distribution". [Gainesville, Fla.]: University of Florida, 2002. http://purl.fcla.edu/fcla/etd/UFE0000507.
Texto completoTrémine, Stéphane. "Etude du refroidissement laser d'atomes de césium 133 dans un champ de speckle 3D et réalisation d'une horloge atomique compacte". Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066133/document.
Texto completoThe HORACE project consists in the development of a high-performance compact atomic clock based on isotropic laser cooling of 133Cs atoms, targeting the needs for on-board clocks. In order to minimize the clock size, the entire clock sequence is performed inside one interaction zone only, including atomic cooling, preparation, interrogation and detection. This is made possible with a microwave interrogation cavity that is both resonant at the clock transition frequency, and used as an integrating sphere for the cooling light as well. This thesis work is mainly dedicated to the experimental study of the atomic cooling in the 3D speckle field generated inside the cavity. By limiting the cooling sequence to a capture phase, about 3x108 atoms can be cooled to kinetic temperatures lower than 60 microkelvins. Besides, we show that an inhomogeneous optical energy repartition in the cavity leads us to perform the sub-Doppler cooling phase in 2 steps. Despite random polarization change from one speckle grain to another, the atomic cooling dynamics observed in the sub-Doppler regime is similar to the one observed in conventional optical lattices. The last part of this thesis is devoted to the metrological aspect where the entire clock sequence is demonstrated for the first time at the same place. The fractional frequency stability of 2x10-13-1/2 should be reached on Earth
Kroemer, Eric. "Etude du déplacement collisionnel de la fréquence d'horloge du césium en présence du gaz tampon hélium ou xénon. Applications pour microcellules à haute température". Thesis, Besançon, 2015. http://www.theses.fr/2015BESA2047/document.
Texto completoThis thesis presents a study on collisional shift of cesium clock frequency in the presence of helium or xenon buffer gas. Introduction of buffer gas in alkaline vapour cells is necessary to narrow the CPT line-width by Dicke effect. Nevertheless, buffer gas induces a quadratic shift of the clock frequency versus temperature cell. Cancellation of collisional shift temperature dependence is possible at a so-called inversion temperature depending on the buffer gas ratio. This inversion temperature is great working point for micro atomic clocks. This temperature is required to be 90 or even 100 °C, especially to work in harsh environmental constraints. We measured collisional shift coefficients of cesium clock frequency in presence of helium buffer gas and we determined for the first time the value of the quadratic coefficient. About xenon buffer gas, the measurement of collisional shift coefficients is more difficult because of non-expected cubic behavior of collisional clock frequency shift which could be linked to the interaction with van der Waals molecules. We established that a neon-helium buffer gas mixture could allow an inversion temperature superior to more than 80 °C. Inversion temperatures from 89 to 94 °C are measured in cesium vapor microcells filled with a mixture containing a few percent of helium
Muller, Stella Torres. "Padrão de frequência compacto". Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/76/76132/tde-11052010-154900/.
Texto completoWe present some relevant aspects for the construction and characterization of a compact primary frequency standard. In this system, the atomic ensemble is prepared with a magnetooptical trap. Once a significant number of cold atoms is obtained, the laser beams are turned off and, during the free expansion, the cloud is submitted to a sequence of two microwave pulses, characterizing the well-known Ramsey method. The microwave pulses are applied in a microwave cavity that was sculpted inside the vacuum chamber. All the working cycle takes place into this cavity. When the atoms are interrogated by two pulses of τ = 1 ms separated by Τ = 8 ms, the linewidth of the central fringe is 52 Hz and a short-term stability 10-13 is observed. Some frequency shifts were evaluated.
Reinhard, Friedemann. "Design and construction of an atomic clock on an atom chip". Paris 6, 2009. https://tel.archives-ouvertes.fr/tel-00414386.
Texto completoVon, Bandel Nicolas. "Development and study of low noise laser diodes emitting at 894 nm for compact cesium atomic clocks". Thesis, Montpellier, 2017. http://www.theses.fr/2017MONTS003/document.
Texto completoThis PhD work deals with the design, the fabrication and the study of high-coherence semiconductor laser sources emitting at 894 nm, for application to compact, optically-pumped cesium atomic clocks in an industrial context. We are particularly interested in the electrically pumped "Distributed-Feedback" in-plane laser diodes (DFB). The aim is to obtain a low-threshold, single-mode laser with high optical efficiency and a linewidth of less than 1 MHz. We first deal with the design and first-order characterization of the DFB diodes until they are put into modules for the clock. We then carry out an in-depth study of the physical properties of the laser emission in terms of coherence time. For that purpose, a new universal method for characterizing the optical frequency noise is introduced. Finally, we look further into the spectral properties of the emission in a servo configuration on a fluorescence line of the cesium ("Dither-Locking"). We show that the intrinsic properties of the component satisfy the requirements of the industrial system as defined in the study
Tricot, Francois. "Analyse et réduction des sources d'instabilitè de fréquence dans une horloge CPT compacte". Thesis, Sorbonne université, 2018. http://www.theses.fr/2018SORUS037/document.
Texto completoThis thesis work has been granted by a CIFRE-Défense contract to study the frequency stabilities of an atomic clock based on coherent population trapping. The objective is to demonstrate a frequency stability in the range of 10-13 tau-1/2 up to 10 000 s. A caesium vapour cell is used with a high-contrast excitation scheme using cross linear polarisations and a Ramsey interrogation. The short-term frequency stability is presented with the reduction of the phase and the laser power noise, both limiting clock performance at 1 s integration time. The optimisation of the microwave chain with a new local oscillator, and the implementation of a very low noise power lock loop have improved the frequency stability down to 2,3x10-13 at 1 s integration time. The fluctuations analysis of the operating parameters (laser intensity, magnetic field, temperature, etc.) and the measurement of the clock frequency show that the medium-term frequency instability is mostly limited by laser power and magnetic field fluctuations at the level of 2x10-14 at 2 000 s integration time. These analyses also show that laser power fluctuations, despite servo loop control, are related to polarisation fluctuations through temperature fluctuations inside the experiment isolation box. Finally, the studies of a dual-frequency and dual-polarisation laser for a compact CPT clock are presented, paving the way to industrialisation by reducing the optical bench
McGahey, Christopher Shawn. "Harnessing nature's timekeeper". Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/28255.
Texto completoCommittee Chair: Usselman, Steven; Committee Member: Ceccagnoli, Marco; Committee Member: Giebelhaus, August; Committee Member: Hunt, William; Committee Member: Krige, John.
Yu, Jen-Tsung y 游仁宗. "A Compact Delay-Recycled Clock Skew-Compensation And/Or Duty-Cycle-Correction Circuit". Thesis, 2011. http://ndltd.ncl.edu.tw/handle/34570195575256761660.
Texto completo國立暨南國際大學
電機工程學系
99
A clock skew-compensation and/or duty-cycle correction circuit (CSADC) is indispensably required to maximize the performance of a synchronous double edge clocking system. Most conventional CSADC adopted a cascade structure that inherits a lower performance property that is causing a slower the locking procedure, meanwhile the dual loop design results in more design complexity. In this thesis, a compact delay-recycled CSADC was proposed. There are two significant design concepts in the CSADC. The first is a fast locking and low power measure-and-tuned architecture. The second is a bandwidth augmentation technique. Compared to conventional CSADCs, the proposed circuit achieves at least a 4.24 times reduction in power, a 7.93 times reduction in power bandwidth ratio, and a 1.11 times reduction in lock-in cycles. In TSMC 0.18-μm 1P6M 1.8V CMOS process, the “input signal frequency range” of the proposed CSADC from 300MHz to 2GHz, and the corrected duty cycle variation ranges from 48.41% to 55.51% are confirmed through HSPICE circuit simulation. When the clock frequency is 2GHz, the acceptable input duty cycles ranges from 30% to 70%. Besides, the aligned phase error and power consumption are 67ps and 5.87mW, respectively.
Yu-PoCheng y 鄭宇栢. "An 8 Gb/s Half-rate Digital-based Clock and Data Recovery Circuit With Compact Control Loop". Thesis, 2015. http://ndltd.ncl.edu.tw/handle/22273104744868636376.
Texto completo國立成功大學
電機工程學系
103
This thesis presents a compact control loop and a digitalized stepwise control method to improve area and power efficiency performance for digital-based CDRs. By combining the frequency control loop and integral path with a digital adder, some tributary circuits are removed to save total area and power. Meanwhile, the stepwise control technique proposed in [9] for constant system bandwidth is digitalized to enhance the system robustness. The digital-based CDR is designed and fabricated in 90-nm GUTM CMOS process. The measured root mean square (rms) jitter ratio of the synchronous clock and recovered data is 3.2% [9.25ps] and 0.048UI [13.66ps] and the peak to peak jitter is 22.5% [64.38ps] and 0.23UI [65.63ps] while the input data pattern is 7Gb/s PRBS7. The core area of the test chip is 0.054 mm2 and its power efficiency is 1.623 mW/Gb/s. Keyword: PLL, CDR, digital-based CDR.
Yang, Ko-Hsin y 楊可歆. "A Case Study of Click-and-Mortar Business Model in A Diving Company". Thesis, 2015. http://ndltd.ncl.edu.tw/handle/nm9k9r.
Texto completo國立臺灣科技大學
管理學院MBA
103
Click and Mortar Business Model is a business model integrated virtual and physical channels with the aspects as brands, processes and customers. This concept is not a new topic, since some e-commerce discussion also focused on the integration and development of virtual and physical channels. Due to the boom of mobile device applications in recent years, mobile networking features blurred the boundaries between virtual and physical channels even more. By the success of the gradually increased actual virtual and physical integration business model cases, it is generally considered that a successful virtual and physical integration can improve customers’ satisfaction, and bring high operational efficiency for enterprises. However, the synergy applications and benefits by the integration must rely on the “integrating” skill of operators to bring it to the reality. Since there is necessity of integration, there must be differences occur between virtual and physical channels, which mean the companies can’t directly copy the original set store management experience to another type of channels. The subject of the case study is a company in tourism services industry and the in-depth understanding of this single case was gained through secondary data collection and in-depth interviews. Discussions were done on the case study company’s synergy applications and benefits brought by the business model after virtual and physical integration, hoping to propose good suggestions to companies facing virtual and physical integration operation. Studies have shown that whether there is integrate or separate virtual and physical channel integration model when implementing, there are both advantages and disadvantages. Therefore, the very first consideration is how to approach the suitable integrating level to company itself. Virtual and physical channel integration can’t be succeed in at the first try and its development effectiveness can’t appear in a short time, either. Thus, companies cannot process virtual and physical channel integration with the concept of channel expansion by corresponding tendency. If so, the company will fall into the myth of integration and lost the operating basis and advantages of the original physical store. Companies should check the limited resources available, carefully assess the pace of development and seek for the possibility of maximized development. If there is development cost considerations and limitations in small and medium enterprises, they should be more compatible with an open mind and consider the collaboration possibility with the third-party virtual information platforms and payment systems industry to avoid differentiation and resource wasting. Business owners must have a broader thinking and mind in order to have creating newer, better and more comprehensive core values as the goal to keep the flexibility and endurance a company should have during virtual and physical integration model. The company should also be supportive to have the management team develop better management capabilities and have high control skill on both virtual and physical channels and continuously strengthen and enhance the company’s cross-channel customer service ability to ultimately activate the operational efficiency of both ends at the same time and actually reach the business goals of virtual and physical integration.
Ko, Sheng-Ching y 葛盛青. "An Investigation on the Click-and-Mortar Marketing :An Empirical Study of Gifts Company". Thesis, 2010. http://ndltd.ncl.edu.tw/handle/6sawqa.
Texto completo國立臺北科技大學
工業工程與管理研究所
98
In recent years, Internet marketing its low-cost, non-regional, timeliness and other properties, marketing has become a favorite of all walks of life. This study will focus on a Gift Company which located in north area of Taiwan, and we will take it as the actual example of Click and Mortar, consolidation of the case company turnover and the number of website visitors to do correlation analysis and obtained a positive correlation between the two, to demonstrate the combination of traditional marketing, Internet marketing advantages. This study uses case study method, in-depth interviews, online survey to obtain information needed for analysis, a total of 104 valid questionnaires. And apply the descriptive statistics, factor analysis, reliability and validity analysis, Pearson product-moment correlation and simple regression analysis method, for data processing, and various hypotheses. The results showed that: the use of Internet e-marketing techniques, the business turnover and number of visitors to its website the results show a significant positive correlation between them. Therefore, according to the results of this study to make conclusions from the analysis, that can give gifts industry and future researchers as a reference and as a network of electronic marketing activities to enhance marketing efficiency and references within.
CHEN, HUI-CHIN y 陳慧親. "Exploring the Business Model of Integrating Click and Mortar:A study of the F Company". Thesis, 2017. http://ndltd.ncl.edu.tw/handle/06527586262285327133.
Texto completo逢甲大學
全球運籌經營管理產業碩士專班
105
The development of e-commerce has flourished in recent years and more and more enterprises have started to use the Click and MortarModel to promote the global economic and social trading transformation. This subverts the traditional business model, not only make the cost of information more affordable ,but also bring another new business channel revolution. Through the questionnaire , it help to understand the sales stores and e-commerce brand management which complements each other. Companies should have a key element to assess how the company operates store sales and e-commerce business model. Through this study, it is expected that the case company will have a better understanding of the buying habits and behavior of consumer which will enhance the business strategy and value.
Jhang, Wun-Jyuan y 張文娟. "Exploring the Influential Factors on Retailing Sales of a Click-Brick Fashion Company Using MARS". Thesis, 2016. http://ndltd.ncl.edu.tw/handle/14250061332735612331.
Texto completo淡江大學
管理科學學系碩士班
104
Sales forecasting is a crucial issue that many companies pay concentrate on. Among fashion industry, due to the rapid change of fashion trend, unstable consumer demand and short product life cycle, accurate sales forecasting is able to avoid loss of benefits. As for the improvement of information technology, business model of virtual channel is also develop further. Many fashion retailer add the physical and virtual channels, combining physical store with Internet store to implement the marketing strategy with integration of physical and virtual Channel, in order to achieve higher profit models. Conform to the Multiple-channel time, the paper adopts the data of fashion industry and also considers the historical sales data , seasonality and climatic factors. And using multivariate adaptive regression splines (MARS) and general linear regression to construct the sales forecasting model. To explore the main factors that impact the sales result of physical and virtual channel in the fashion industry. The empirical results of the research, this forecasting model and conclusion can be consulted for decision making by the business manager. Also can understand the role of important factors in either positive or negative sides which affect future sales. In conclusion, the research is beneficial for the company to do products forecasting and improve marketing strategies efficiently within highly complicated sales forecasting.
Chang, Fu-Hung y 張富閎. "A Study on the Business Model of Click-and-Mortar for Medical Services:Example of Miracle Consultant Company". Thesis, 2016. http://ndltd.ncl.edu.tw/handle/za6cyp.
Texto completo國立暨南國際大學
管理學院經營管理碩士學位學程碩士在職專班
104
In recent yearss, the Development of international medical services in Taiwan has been generally concerned. There are few studies about the business model for international medical services, so this study emphasizes the international medical management pattern and benefit analysis to analyze those with Click-and-Mortar Busines s model by actual case analysis. The study find that the brand, management, assignments and equity effectively explain the case of management orientation and competitive advantages. The benefit analysis of actual situation integrated business model has helped to promote this case, reduced their operating cost, increased added value by produce variety, raised customer reliability and expanded markets of international medical treatment.
HUANG, LI-CHIEN y 黃麗蒨. "The Case Study of E-Commerce Website Service of Click-and-Mortar Business-A Case of E Company". Thesis, 2016. http://ndltd.ncl.edu.tw/handle/25u3h3.
Texto completo世新大學
傳播匯流與創新管理數位學習碩專班
104
The sound development of network infrastructure in Taiwan encouraged many traditional stores realized the profound business opportunities and transformed their business models from offline to online. This study applied content analysis to investigate E company’s website structure, contents and functions, followed with in-depth interview to reveal the strategies of products, price, and promotion. In addition, the study also explored the drive of emerging offline to online business along with the experiences of integration, channels of marketing strategies, and benefit of utilizing the Click-and-Mortar business model. The major findings are as follow: (1) E company’s website contains well-developed e-commerce functions such as exclusive commodity classification, shopping cart, commodity storage, checking out and cash flow. The functions also includes with well-rounded multiple mechanism for promotion activities, order management, and shipping and return management; a clear structure of categories and content layout brought clear information presentation based on characteristics of information. The structure uses user interface design and browse circulation to convey information to target customers more effectively as well. (2) The drive of transforming E company’s business models from offline to online was to adapt to the changing industrial environment. The major considerations include human resource management of the company; The strategies of marketing channels and pricing and products both online and offline business are similar; For promotion strategy, monthly theme promotional activities and offline channel are considered a better method in current consequences. (3) The combination of E company’s physical and virtual business benefits include increasing number of member, revenue, quantity of sales, enhancing the trust of consumers, value-adding on relevant knowledge of the commodities, increasing the cross orders of products of home appliances in central and southern region. (4) The processing experiences gained from the case, E company, and during its integrated physical and virtual practices including: (i) the adjustment of operating process of individual department through work integration and division on co-operating website among departments that results without increasing of manpower; (ii) The virtual platform Google AdWords keyword advertising, preferential system - coupon operation, the site has exceeded the regional restrictions and increase the orders of central and southern regions; (iii) The coordination and communication among departments to adjust the distribution process and utilize the import and export of data to integrate the system issue of online and offline. The E company’s website development is under ongoing stage. There are many competitors in the market, as many physical discount stores are expanding their virtual channels. The E company’s needs to find out its marketing position and to develop its brand strategies in order to be competitive in the market.Most of firms in Taiwan are small and medium enterprises and intend to gradually expand from physical storefront to the virtual sales channel. The result of the study and suggestions are helpful references for those entity enterprises who intends to extend their business models torward virtual path in order to promote their sales channel.
Yeh, Che-Yu y 葉哲宇. "The Application of Activity Value Management in Click-and-Mortar Retailers - A Case Study in Electronic Retailer Company". Thesis, 2019. http://ndltd.ncl.edu.tw/handle/27hjvb.
Texto completo國立政治大學
會計學系
107
The advent of omni-channel has changed retail business model. Retail activities shift from enterprise orientation to customer orientation. In order to improve customer satisfaction, Retailers integrate online and offline channels to become click-and-mortar retailers. AVM can help click-and-mortar retailers to obtain cause and effect information. The decision maker would have a comprehensive perspective to find management problems and make effective decisions by using these information. Therefore, this study discusses that why do click-and-mortar retailers need AVM, and explores the method and benefit of Application of AVM in click-and-mortar retailers.
CHANG, SHENG-CHING y 張盛景. "Exploring a Firm's Bricolage Process from Brick-and-Mortar to Brick-and-Click --A Case Study of T Company". Thesis, 2017. http://ndltd.ncl.edu.tw/handle/b493sd.
Texto completo中國文化大學
國際企業管理學系碩士在職專班
105
This thesis explores SMEs’ bricolage process from brick-and-mortar to brick-and-click. The researcher selects a physical channel retailer founded in southern Taiwan and uses this case analysis to explain its critical activities and events and exam-ine how it recombines the resources at hand to expand virtual channels in re-source-constrained environments. The finding has revealed SMEs proceeding with recombination the resources at hand can achieve the goal of developing virtual channels and bring positive aid to itself. SMEs will confront challenges when establishing virtual channels, but through using bricolage resources at hand will reduce these impacts. Most “resources at hand” in bri-colage processes are contributed by the founders’ abilities and experiences. In the inten-sity of relationships of offline to online is not done in sequence. Channel conflict and cannibalization are not apparent in the process of click and mortar. Developing and in-tegrating physical and virtual channels promotes SMEs higher sale performance and good corporate image. SMEs facing the rapid environmental changes using bricolage resource at hand. The way SMEs applying bricolage resources at hand is closely linked with changing of enterprise.
Lu, Wei-Te y 呂維德. "A Case Study of Pay-Per-Click Implementation and Effectiveness:An Example of Small and Medium Industrial Personal Computer Company". Thesis, 2015. http://ndltd.ncl.edu.tw/handle/60338654597714858348.
Texto completo輔仁大學
科技管理學程碩士在職專班
103
Taiwan is an export international trade-oriented country. In the business development of local manufactures toward global market, they often develop international market and seek for new clients by varied marketing tools. However, the marketing tools will bring different effects due to industrial character, varied culture of nation or region and the evolution of modern information consultation tools. The main aim of this study was to propose evaluation methods and result comparative analysis, through discussing the computer industry of information and electronic industry, with the marketing investment of new-type Google( or Yahoo)’s Key Words Ads, comparing its achievement and cost with traditional international expo or other marketing methods, finding that Key Words Ads is more beneficial for the industry. This study provides tools, methods and advice which is more effective and applicable for the development of international business in computer industry, as the references for marketing budget plan of future manufactures in this field.
Wang, Cheng-Yen y 王正彥. "Research on Business Model of Click-and-Mortar for Hypermarkets: A Case Study of the R company in China". Thesis, 2018. http://ndltd.ncl.edu.tw/handle/a4p68y.
Texto completo國立中興大學
高階經理人碩士在職專班
106
Mobile devices and Internet grow up rapidly in the recent years, so the consumption habits of people are gradually changing. Because the proportion of online shopping is leaps and bounds growthing, Brick-and-mortar stores gradually lose the advantage of retail markets. Therefore, they come up with some new business models such as China''s RT-Mart feiniu.com and Wal-Mart Walmart.com. However, the electronic commerce industry also begins to develop physical access such as Amazon Amazon.go. It is a good example of electronic commerce industry to setup physical stores. In summary, the O2O(Online to Offline) becomes the main business model. This thesis applys the case study method; moreover, we interview executives from R company in order to realize the new threat from electronic commerce industry. Besides,this thesis extends the research report of the McKinsey & Company, “Making stores matter in a multichannel world”.Finally, this thesis will summarize some conclusions which bases on the above analysis. Main conclusions are summarized as follows 1.R company should take the consumer demand as priority in the process of O2O transformation. 2.R company should adjust the structure of the commodity because the consumption demands are changing. 3.R company should try to open medium-sized supermarkets in the downtown because the consumption habits are changing,