57 research outputs found
Raman Sideband Cooling 171Yb+ Across Zeeman Sub-levels
No full textWe implemented Raman sideband cooling in 171Yb+ between weakly split Zee- man states rather than across the typical 12.6 GHz hyperfine splitting and infer sub-Doppler cooling from ,,==[29(2),36(16),16.2(5)] to [0:07(7), 2:0(1:2), 5:6(2)].Full Tex
The Procedural Meaning of moji-dori ('literally')
No full text本稿は筆者が2019年度に京都大学大学院人間・環境研究科へ提出した修士論文および日本語用論学会第22回大会(於 京都外国語大学)の発表論文を基にしている。本稿の目的は発話解釈の観点から「文字通り」の機能を考察し、これを単⼀の手続き的意味として規定することにある。「文字通り」は「後続表現の構成要素の意味を強調する」「後続表現を字義的に解釈させる」をはじめ、籾山(2014)や用例観察に基づく記述からは多数の機能が想定される。このとき、「文字通り」の機能を多義として規定するか、より⼀般的な手続き的意味から派生された用法群として解釈するかで2通りの説明が可能であるが、本稿の目的に鑑みて筆者は後者の立場を採用する。そして、その機能を「パラ言語的情報を参照し、後部要素の非帰属的メタ表示を形成せよ」という手続き的意味として同定し、関連性理論(Wilson & Sperber 1995; Wilson 2000)の枠組みから後部要素の解釈プロセスを説明する。The purpose of this paper is to discuss the function of moji-dori ('literally') from a view of utterance interpretation. According to Momiyama (2014) and other studies, there can be several functions such as "drawing attention to the constituents of the modified elements", "interpreting them as literal meanings". There are two possible explanations for the function of moji-dori; one is to specify it as a polysemy, and the other is to interpret it as usages derived from a more general procedural meaning. For the purpose of this paper, the author would take the latter way and propose the procedural meaning of moji-dori as "forming a non-attributive metarepresentation of subsequent elements via para-linguistics information (i.e. orthographic form)", providing a relevance-theoretic account of the detailed process of interpreting the subsequent elements (Wilson and Sperber 1995, Wilson 2000)
Dynamic compensation of stray electric fields in an ion trap using machine learning and adaptive algorithm
No full textSurface ion traps are among the most promising technologies for scaling up quantum computing machines, but their complicated multi-electrode geometry can make some tasks, including compensation for stray electric fields, challenging both at the level of modeling and of practical implementation. Here we demonstrate the compensation of stray electric fields using a gradient descent algorithm and a machine learning technique, which trained a deep learning network. We show automated dynamical compensation tested against induced electric charging from UV laser light hitting the chip trap surface. The results show improvement in compensation using gradient descent and the machine learner over manual compensation. This improvement is inferred from an increase of the fluorescence rate of 78% and 96% respectively, for a trapped [Formula: see text] Yb[Formula: see text] ion driven by a laser tuned to [Formula: see text] MHz of the [Formula: see text] S[Formula: see text] P[Formula: see text] Doppler cooling transition at 369.5 nm
Writing the Lagosian Homeland: the ambiguous and precarious African urban in Chris Abani's GraceLand (2004)
No full textLocated at the intersection of Urban Geographies and Literary Studies, this study focuses on urban geographical considerations as they are applied to the depiction of the city of Lagos, Nigeria in Chris Abani's novel GraceLand published in 2004. While exploring the cartographies of urban space in the novel, the study applies principles and theories of Southern Urbanisms, notably AbdouMaliq Simone, Ato Quayson, Edgar Pieterse and so much more to reading Lagos as a representation of the African urban. The study offers a critical exploration of the ways that the city of Lagos is mapped by the diasporic author - firstly, on the Noir genre and any possible connections to be made to the novel; secondly on the perception of the homeland and how this feeds into the mapping of the city in the text; thirdly on the lived experiences of those who reside in the city, particularly the perspective of the main character who presents as a type of flaneur within it. The study ultimately hopes to highlight inherent complexities and ambiguities and contribute towards a modification of global perceptions of the African urba
Evaluating Dynamic Environment Difficulty for Obstacle Avoidance Benchmarking
No full textDynamic obstacle avoidance remains a crucial research area for autonomous systems, such as Micro Aerial Vehicles (MAVs) and service robots. Efforts to develop dynamic collision avoidance techniques in unknown environments have proliferated in recent years. While these methods exhibit impressive and reliable performance in simpler environments, their efficacy in more challenging settings remains an area ripe for enhancement. The difficulty of these environments arises from a multitude of factors, and currently, no standardized approach exists to quantify this complexity. Additionally, to fairly compare different dynamic collision avoidance strategies, it's essential to assess them in environments with a similar degree of difficulty. Therefore, devising a metric capable of accurately gauging the intricacy of dynamic environments becomes imperative.Building on this context, this master's thesis endeavors to fill this critical gap through three contributions: 1) The establishment and validation of map difficulty metrics that represent the difficulty of dynamic environments, 2) The introduction of a robust benchmarking pipeline to critically validate the representativeness of the proposed metrics and evaluate various collision avoidance strategies, and 3) The provision of a framework for comparative analysis of different planning strategies, utilizing the introduced map difficulty metric. The proposed survivability metric effectively captures environmental complexity. Its validity is evidenced by a notable correlation with the success rates of typical collision avoidance methods, with over 1.7 million collision avoidance trials on over six hundred maps, securing a Spearman's Rank correlation coefficient (SRCC) of over 0.9. This metric serves as an indispensable tool for facilitating fair comparisons in this dynamic research domain. More importantly, it offers valuable insights for the future refinement and improvement of dynamic collision avoidance strategies, making a contribution to the continuous advancement of autonomous systems.Mechanical Engineering | Vehicle Engineering | Cognitive Robotic
Ultrafast coherent excitation of an ytterbium ion with single laser pulses
No full textExperimental realizations of two qubit entangling gates with trapped ions typically rely on addressing spectroscopically resolved motional sidebands, limiting gate speed to the secular frequency. Fast entangling gates using ultrafast pulsed lasers overcome this speed limit. This approach is based on state-dependent photon recoil kicks from a sequence of counter-propagating, resonant, ultrafast pulse pairs, which can allow sub-microsecond gate speeds. Here, we demonstrate a key component of the ultrafast gate protocol, the coherent excitation of a 171Yb+ ion across the 2S1∕2-2P1∕2 transition with a single near-resonant short optical pulse at 369.53 nm. We achieve a maximum population transfer of 94(1)% using a picosecond pulsed laser that can be tuned across the 2S1∕2-2P1∕2 transition and 42.5(9)% with 190(7) GHz detuning.Full Tex
Author´s Book
No full textVytvoření autorské knihy, která by navazovala na moji předchozí práci, video s názvem "Nuoc". Kniha by volně tématizovala vodu, respektive vietnamské
slovo"nuoc", které se dá přeložit jako voda, ale i další slova jako je vlast, národ a stát. Obrazová i textová složka integrovaná do autorského layoutu pro tištěný výstup.ObhájenoCreating an author's book that would follow my previous work, a video called "Nuoc". The book was loosely themed on water, the Vietnamese word "nuoc", which can be translated as water, but also other words such as homeland, nation and state. An image and text parts integrated into the author's layout for printed output
Association of country income level with the characteristics and outcomes of critically ill patients hospitalized with acute kidney injury and COVID-19
No full textIntroduction: Acute kidney injury (AKI) has been identified as one of the most common and significant problems in hospitalized patients with COVID-19. However, studies examining the relationship between COVID-19 and AKI in low- and low-middle income countries (LLMIC) are lacking. Given that AKI is known to carry a higher mortality rate in these countries, it is important to understand differences in this population.
Methods: This prospective, observational study examines the AKI incidence and characteristics of 32,210 patients with COVID-19 from 49 countries across all income levels who were admitted to an intensive care unit during their hospital stay.
Results: Among patients with COVID-19 admitted to the intensive care unit, AKI incidence was highest in patients in LLMIC, followed by patients in upper-middle income countries (UMIC) and high-income countries (HIC) (53%, 38%, and 30%, respectively), whereas dialysis rates were lowest among patients with AKI from LLMIC and highest among those from HIC (27% vs. 45%). Patients with AKI in LLMIC had the largest proportion of community-acquired AKI (CA-AKI) and highest rate of in-hospital death (79% vs. 54% in HIC and 66% in UMIC). The association between AKI, being from LLMIC and in-hospital death persisted even after adjusting for disease severity.
Conclusions: AKI is a particularly devastating complication of COVID-19 among patients from poorer nations where the gaps in accessibility and quality of healthcare delivery have a major impact on patient outcomes
Monolithic Optical Integration for Scalable Trapped-ion Quantum Information Processing
No full textAbstract:
Quantum information processing (QIP) promises to radically change the outlook for secure communications, both by breaking existing cryptographic protocols and offering new quantum protocols in their place. A promising technology for QIP uses arrays of atomic ions that are trapped in ultrahigh vacuum and manipulated by lasers. Over the last several years, work in my research group has led to the demonstration of a monolithically integrated, scalable optical interconnect for trapped-ion QIP. Our interconnect collects single photons from trapped ions using a diffractive mirror array, which is fabricated directly on a chip-type ion trap using a CMOS-compatible process. Based on this interconnect, we have proposed an architecture that couples trapped ion arrays with photonic integrated circuits to achieve compatibility with current telecom networks. Such tightly integrated, highly parallel systems open the prospect of long-distance quantum cryptography.Griffith Sciences, School of Natural SciencesNo Full Tex
Comparative Analysis of Passing, Possession, and Goal-Scoring Trends in Euro 2024 and Copa America 2024
No full textFootball, as a team sport, relies on a delicate balance where tactical cohesion and strategic play are as critical as physical prowess. While evidence suggests that European teams often display higher physical intensity, the tactical differences between European and American football are still not well quantified. The aim of this study is to conduct a comparative analysis of passing, possession, and goal-scoring dynamics in Euro 2024 and Copa America 2024. Data from 51 Euro matches and 32 Copa America matches, encompassing all game events with sub-second precision, were obtained from StatsBomb. Analyses were performed in MATLAB, with possession calculated as ‘pure possession,’ excluding inactive periods. Euro 2024 teams demonstrated significantly more total passes per match (p<0.05, Cohen’s d=1.43), higher pass completion rates (p<0.05, Cohen’s d=1.30), and longer possession sequences (p<0.05, Cohen’s d=0.24). They also showed greater possession in the five minutes prior to goals (p<0.05, Cohen’s d=0.63). In contrast, Copa America 2024 teams favored longer passes (p<0.05, Cohen’s d=0.15), reflecting a more direct playing style. Possession disparities between teams in individual matches did not differ significantly (p=0.31, Cohen’s d=0.23), and the distribution of shot distances for goals was also similar across tournaments (p=0.86, Cohen’s d=0.02). In summary, Euro 2024 teams emphasized control through longer possession and greater passing accuracy, while Copa America 2024 teams relied on more dynamic and direct play. These findings underscore how regional footballing philosophies shape match strategies and outcomes, offering insights into the tactical diversity of international football
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