{"results":[{"id":"arxiv_2508.04087","title":"Prime Ideal Races With Several Competitors","authors":[{"name":"A Bailleul"},{"name":"M Hayani"}],"abstract":"We investigate races among prime ideals in number fields when there are two or more competing conjugacy classes. In their work [4], Fiorilli and Jouve studied two-way races in number fields and showed that-unlike the classical setting of primes in arithmetic progressions-these biases can approach the extreme values of 0 and 1. They also identified when these biases tend toward one-half (as the degree of the extension grows), which we call ''moderate biases'' because that behavior mirrors the classical case.  In this paper, we extend their analysis to races with r competing conjugacy classes (rway races) and precisely study the cases where these biases are moderate (meaning they tend to 1/r! as the discriminant of the extension grows). Our first main result is an explicit formula for the bias in any r-way race (for all r $\\ge$ 2), generalizing the two-way formula of Fiorilli and Jouve [4] and Lamzouri's r-way expression in the classical case of residue classes modulo q [12], under the same hypotheses. Using this formula, we give a criterion characterizing completely, in the abelian case, r-moderate races. Surprisingly, once r $\\ge$ 3 this criterion is independent of r, making the two-way race exceptional. We also construct families of number fields exhibiting such moderacy, we prove density results for the values of logarithmic densities and exhibit different behaviors of those densities between the cases r = 3 and r $\\ge$ 4.","source":"arXiv","year":2025,"language":"en","subjects":["math.NT"],"url":"https://arxiv.org/abs/2508.04087","pdf_url":"https://arxiv.org/pdf/2508.04087","is_open_access":true,"published_at":"2025-08-06T05:05:51Z","score":69},{"id":"arxiv_2504.10813","title":"Enhanced Data Race Prediction Through Modular Reasoning","authors":[{"name":"Zhendong Ang"},{"name":"Azadeh Farzan"},{"name":"Umang Mathur"}],"abstract":"There are two orthogonal methodologies for efficient prediction of data races from concurrent program runs: commutativity and prefix reasoning. There are several instances of each methodology in the literature, with the goal of predicting data races using a streaming algorithm where the required memory does not grow proportional to the length of the observed run, but these instances were mostly created in an ad hoc manner, without much attention to their unifying underlying principles. In this paper, we identify and formalize these principles for each category with the ultimate goal of paving the way for combining them into a new algorithm which shares their efficiency characteristics but offers strictly more prediction power. In particular, we formalize three distinct classes of races predictable using commutativity reasoning, and compare them. We identify three different styles of prefix reasoning, and prove that they predict the same class of races, which provably contains all races predictable by any commutativity reasoning technique.   Our key contribution is combining prefix reasoning and commutativity reasoning in a modular way to introduce a new class of races, granular prefix races, that are predictable in constant-space and linear time, in a streaming fashion. This class of races includes all races predictable using commutativity and prefix reasoning techniques. We present an improved constant-space algorithm for prefix reasoning alone based on the idea of antichains (from language theory). This improved algorithm is the stepping stone that is required to devise an efficient algorithm for prediction of granular prefix races. We present experimental results to demonstrate the expressive power and performance of our new algorithm.","source":"arXiv","year":2025,"language":"en","subjects":["cs.PL","cs.FL","cs.LO","cs.SE"],"url":"https://arxiv.org/abs/2504.10813","pdf_url":"https://arxiv.org/pdf/2504.10813","is_open_access":true,"published_at":"2025-04-15T02:22:58Z","score":69},{"id":"doaj_10.22054/urdp.2023.55092.1248","title":"ارزیابی شاخص‌های تحقق توسعه حمل‌ونقل شهری عمومی‌محور (موردمطالعه: منطقه 11 تهران)","authors":[{"name":"سید جلال الدین حسینی"},{"name":"آزیتا رجبی"},{"name":"افشین سفاهن"},{"name":"علی اصغر رضوانی"}],"abstract":"توسعه حمل‌ونقل عمومی محور، یکی از راهکارهای مهم و مصادیق توسعه پایدار شهری است که به‌منظور حل معضلات ترافیکی و بهبود شرایط حمل‌ونقل در شهرها مورداستفاده قرار می‌گیرد. در این رویکرد، برنامه‌ریزی و گسترش حمل‌ونقل عمومی، به‌عنوان جایگزینی برای استفاده از خودروهای شخصی و حمل‌ونقل خصوصی مطرح شده است. منطقه 11 شهرداری تهران یکی از مناطق مرکزی شهر تهران است که دارای بار ترافیکی بالایی است و به‌تبع آن با مشکلاتی در سیستم حمل‌ونقل شهری خود مواجه است. در تحقیق مذکور، باهدف انطباق شاخص‌های توسعه حمل‌ونقل عمومی محور با وضعیت فعلی منطقه 11 شهر تهران و بازپس‌گیری شهر از فضای خودرو محور به فضای انسان‌محور، شاخص‌های استاندارد توسعه حمل‌ونقل عمومی محور به‌عنوان مبنای تحلیل و رتبه‌بندی بررسی‌شده‌اند. در این رویکرد، با توجه به شاخص‌های مختلف، میزان قابلیت منطقه برای تحقق توسعه حمل‌ونقل عمومی محور ارزیابی گردیده است. به‌این‌ترتیب، این تحقیق به مسئولین و برنامه‌ریزان شهری کمک می‌کند تا بر اساس نتایج به‌دست‌آمده، راهکارهای مناسبی برای بهبود حمل‌ونقل در منطقه 11 شهر تهران ارائه دهند. روش تحقیق پژوهش حاضر ازنظر هدف؛ کاربردی و ازنظر متدولوژی توصیفی و ازنظر روش جمع‌آوری اطلاعات مبتنی بر روش‌های کتابخانه­ای – اسنادی و مطالعات میدانی بوده و در تحلیل اطلاعات نیز از نرم‌افزار سیستم اطلاعات جغرافیایی و روش­های رتبه­بندی و در مقایسه تطبیقی، از ضریب ناموزونی موریس و روش بی‌مقیاس خطی و از نرم‌افزار Choice Expert برای تحلیل سلسله­مراتبی AHP استفاده شده است. با توجه به نتایج حاصله، می‌توان گفت که منطقه 11 شهرداری تهران، به‌رغم داشتن پتانسیل بالا برای تحقق توسعه حمل‌ونقل عمومی محور، در شرایط فعلی ظرفیت تبدیل‌شدن به یک مرکز توسعه حمل‌ونقل عمومی محور را ندارد و جهت تبدیل‌شدن باید تغییرات وسیعی در ساختارهای فضایی آن ایجاد شود.","source":"DOAJ","year":2024,"language":"","subjects":["City planning","Urban renewal. Urban redevelopment"],"doi":"10.22054/urdp.2023.55092.1248","url":"https://urdp.atu.ac.ir/article_16487_a2a3f517dac5a8b3038566c5e3748446.pdf","pdf_url":"https://urdp.atu.ac.ir/article_16487_a2a3f517dac5a8b3038566c5e3748446.pdf","is_open_access":true,"published_at":"","score":68},{"id":"arxiv_2401.05642","title":"Optimistic Prediction of Synchronization-Reversal Data Races","authors":[{"name":"Zheng Shi"},{"name":"Umang Mathur"},{"name":"Andreas Pavlogiannis"}],"abstract":"Dynamic data race detection has emerged as a key technique for ensuring reliability of concurrent software in practice. However, dynamic approaches can often miss data races owing to nondeterminism in the thread scheduler. Predictive race detection techniques cater to this shortcoming by inferring alternate executions that may expose data races without re-executing the underlying program. More formally, the dynamic data race prediction problem asks, given a trace σof an execution of a concurrent program, can σbe correctly reordered to expose a data race? Existing state-of-the art techniques for data race prediction either do not scale to executions arising from real world concurrent software, or only expose a limited class of data races, such as those that can be exposed without reversing the order of synchronization operations.   In general, exposing data races by reasoning about synchronization reversals is an intractable problem. In this work, we identify a class of data races, called Optimistic Sync(hronization)-Reversal races that can be detected in a tractable manner and often include non-trivial data races that cannot be exposed by prior tractable techniques. We also propose a sound algorithm OSR for detecting all optimistic sync-reversal data races in overall quadratic time, and show that the algorithm is optimal by establishing a matching lower bound. Our experiments demonstrate the effectiveness of OSR on our extensive suite of benchmarks, OSR reports the largest number of data races, and scales well to large execution traces.","source":"arXiv","year":2024,"language":"en","subjects":["cs.SE"],"url":"https://arxiv.org/abs/2401.05642","pdf_url":"https://arxiv.org/pdf/2401.05642","is_open_access":true,"published_at":"2024-01-11T03:34:21Z","score":68},{"id":"doaj_10.5937/a-u0-46629","title":"Canopies at public transport stops in Belgrade: An example of open public micro-spaces in the city","authors":[{"name":"Maksić-Mulalić Milica"}],"abstract":"Micro-spaces - small-scale public city spaces - represent an important element in the structure of the city, both functionally and aesthetically. Due to their small scale, their importance is often overlooked by experts and investors. The paper describes the concept of canopies at public transport stops in Belgrade, which were created in the period from 2007 to the present day. By multiplying the basic type of canopy and its variations, a recognizable element of the city image is built. By upgrading the basic project and introducing additional elements from the repertoire of modern design, such as \"green\" constructions, \"smart\" technologies, energy efficiency, etc., this form of urban space would be additionally affirmed and contribute not only to the comfort of users, the creation of the identity of the city and public city transport, but also to general interests such as safety, health and environmental protection","source":"DOAJ","year":2023,"language":"","subjects":["Architecture","Urban groups. The city. Urban sociology"],"doi":"10.5937/a-u0-46629","url":"https://scindeks-clanci.ceon.rs/data/pdf/0354-6055/2023/0354-60552357036M.pdf","pdf_url":"https://scindeks-clanci.ceon.rs/data/pdf/0354-6055/2023/0354-60552357036M.pdf","is_open_access":true,"published_at":"","score":67},{"id":"doaj_10.31289/jaur.v6i2.8254","title":"Penataan Permukiman Terdampak Banjir Rob Dengan Penerapan Konsep Rumah Terapung","authors":[{"name":"erislianautarinurfadillah sihombing"},{"name":"Novalinda"},{"name":"Faurantina Forlana Sigit"},{"name":"Rahmadhani Fitri"}],"abstract":"The main impact resulting from sea level rise is the occurrence of high tides which result in tidal flooding to community settlements in Bagan Deli Village. This phenomenon has a negative impact on improving the quality of life indicators in a settlement. Inadequate house shape to prevent tidal flooding and irregular spatial patterns are factors in this research. The purpose of this study is to produce a floating house arrangement design solution which is expected to be a solution for areas affected by tidal flooding. This research method uses a pattern of circulation forms that already exist in Bagan Deli Village and applies the concept of a floating house design with architectural design principles. The results of this study will be published so that it can become a theoretical basis for the community and government in improving the quality of the community environment affected by the tidal flood.","source":"DOAJ","year":2023,"language":"","subjects":["Details in building design and construction. Including walls, roofs","Urban renewal. Urban redevelopment"],"doi":"10.31289/jaur.v6i2.8254","url":"https://ojs.uma.ac.id/index.php/jaur/article/view/8254","is_open_access":true,"published_at":"","score":67},{"id":"doaj_10.4102/ajod.v11i0.850","title":"Disability-inclusive community development: A case of a community garden in Limpopo province in South Africa","authors":[{"name":"Brian Tigere"},{"name":"Theresa Moyo"}],"abstract":"Background: Persons with disabilities living in rural areas are marginalised and excluded in most developmental initiatives in South Africa. They face many economic, political and social problems; hence, improving their quality of life is a daunting and challenging task which needs interventions from both the state and non-governmental stakeholders.\n\nObjectives: This study aimed to examine the role played by community gardens in rural Limpopo province in uplifting the lives of persons living with disabilities as well as their communities as a whole. Its main objectives were to assess the social and economic benefits they have provided to this group of people.\n\nMethod: A qualitative research design was used for this study. Twenty-one participants were identified through purposive sampling. They were made up of people with disabilities, officials from Departments of Agriculture and Social Development. Face-to-face interviews were used to collect data which was analysed thematically.\n\nResults: Key results were that community gardens have contributed to the economic and social well-being of persons with disabilities. They have assisted them with income to supplement their social grants. They also created jobs for their members and contributed to improved livelihoods of their families.\n\nConclusion: The study demonstrated that people with disabilities are capable people who, if given the necessary support, can transform their livelihoods both socially and economically. The study recommends that a disability access audit be conducted to resolve the accessibility challenges of the garden.","source":"DOAJ","year":2022,"language":"","subjects":["Vocational rehabilitation. Employment of people with disabilities","Communities. Classes. Races"],"doi":"10.4102/ajod.v11i0.850","url":"https://ajod.org/index.php/ajod/article/view/850","is_open_access":true,"published_at":"","score":66},{"id":"doaj_Dise%C3%B1o+del+paisaje%2C+salud+y+sustentabilidad++en+el+ambiente+hospitalario","title":"Diseño del paisaje, salud y sustentabilidad  en el ambiente hospitalario","authors":[{"name":"Eduardo Ottaviani"}],"abstract":"\nEl presente artículo desarrolla conceptos relacionados con la función que cumplen los espacios verdes en la salud y las influencias históricas de propuestas higienistas en edificios hospitalarios. En este marco, el trabajo se ocupa de la relación benéfica entre el ser humano, el hábitat construido y la naturaleza, cuando esta última comienza a ser protagonista desde el diseño de paisaje y las nuevas concepciones sobre la función de los espacios verdes y su aporte en la salud. Se exponen dos casos de estudio en los cuales la teoría desarrollada en la tesis doctoral del autor puede aplicarse en la práctica proyectual para el diseño de espacios verdes de hospitales en aporte a la sustentabilidad del hábitat.\n","source":"DOAJ","year":2022,"language":"","subjects":["Architecture","Urban groups. The city. Urban sociology"],"url":"http://localhost/faduupgrade/ojs-33017/index.php/area/article/view/2001","is_open_access":true,"published_at":"","score":66},{"id":"arxiv_2204.00764","title":"A Study of Real-World Data Races in Golang","authors":[{"name":"Milind Chabbi"},{"name":"Murali Krishna Ramanathan"}],"abstract":"The concurrent programming literature is rich with tools and techniques for data race detection. Less, however, has been known about real-world, industry-scale deployment, experience, and insights about data races. Golang (Go for short) is a modern programming language that makes concurrency a first-class citizen. Go offers both message passing and shared memory for communicating among concurrent threads. Go is gaining popularity in modern microservice-based systems. Data races in Go stand in the face of its emerging popularity.   In this paper, using our industrial codebase as an example, we demonstrate that Go developers embrace concurrency and show how the abundance of concurrency alongside language idioms and nuances make Go programs highly susceptible to data races. Google's Go distribution ships with a built-in dynamic data race detector based on ThreadSanitizer. However, dynamic race detectors pose scalability and flakiness challenges; we discuss various software engineering trade-offs to make this detector work effectively at scale. We have deployed this detector in Uber's 46 million lines of Go codebase hosting 2100 distinct microservices, found over 2000 data races, and fixed over 1000 data races, spanning 790 distinct code patches submitted by 210 unique developers over a six-month period. Based on a detailed investigation of these data race patterns in Go, we make seven high-level observations relating to the complex interplay between the Go language paradigm and data races.","source":"arXiv","year":2022,"language":"en","subjects":["cs.DC"],"doi":"10.1145/3519939.3523720","url":"https://arxiv.org/abs/2204.00764","pdf_url":"https://arxiv.org/pdf/2204.00764","is_open_access":true,"published_at":"2022-04-02T05:13:38Z","score":66},{"id":"doaj_10.32866/001c.29149","title":"E-scooter's Availability and Social Equity in Minneapolis, MN: A Spatial Modeling Approach","authors":[{"name":"Ahmad Ilderim Tokey"}],"abstract":"This article examines the social equity of e-scooter availability across different socially disadvantaged groups in Minneapolis, MN (USA). The city’s northwestern part with high poverty rates has a higher e-scooter availability rate than its counterparts. Also, this study did not find any significant inequality involved with race or educational attainment. However, while the city performed well on these, areas with a high percentage of commuters, dependent on transit, bike, and walking, have fewer e-scooters available on their streets. As such an area, the local models of this study underscore the need for more e-scooter deployment in areas close to downtown.","source":"DOAJ","year":2021,"language":"","subjects":["Transportation and communications","Urban groups. The city. Urban sociology"],"doi":"10.32866/001c.29149","url":"https://doi.org/10.32866/001c.29149","is_open_access":true,"published_at":"","score":65},{"id":"arxiv_2010.16385","title":"Optimal Prediction of Synchronization-Preserving Races","authors":[{"name":"Umang Mathur"},{"name":"Andreas Pavlogiannis"},{"name":"Mahesh Viswanathan"}],"abstract":"Concurrent programs are notoriously hard to write correctly, as scheduling nondeterminism introduces subtle errors that are both hard to detect and to reproduce. The most common concurrency errors are (data) races, which occur when memory-conflicting actions are executed concurrently. Consequently, considerable effort has been made towards developing efficient techniques for race detection. The most common approach is dynamic race prediction: given an observed, race-free trace $σ$ of a concurrent program, the task is to decide whether events of $σ$ can be correctly reordered to a trace $σ^*$ that witnesses a race hidden in $σ$.   In this work we introduce the notion of sync(hronization)-preserving races. A sync-preserving race occurs in $σ$ when there is a witness $σ^*$ in which synchronization operations (e.g., acquisition and release of locks) appear in the same order as in $σ$. This is a broad definition that strictly subsumes the famous notion of happens-before races. Our main results are as follows. First, we develop a sound and complete algorithm for predicting sync-preserving races. For moderate values of parameters like the number of threads, the algorithm runs in $\\widetilde{O}(\\mathcal{N})$ time and space, where $\\mathcal{N}$ is the length of the trace $σ$. Second, we show that the problem has a $Ω(\\mathcal{N}/\\log^2 \\mathcal{N})$ space lower bound, and thus our algorithm is essentially time and space optimal. Third, we show that predicting races with even just a single reversal of two sync operations is $\\operatorname{NP}$-complete and even $\\operatorname{W}[1]$-hard when parameterized by the number of threads. Thus, sync-preservation characterizes exactly the tractability boundary of race prediction, and our algorithm is nearly optimal for the tractable side.","source":"arXiv","year":2020,"language":"en","subjects":["cs.PL"],"url":"https://arxiv.org/abs/2010.16385","pdf_url":"https://arxiv.org/pdf/2010.16385","is_open_access":true,"published_at":"2020-10-30T17:29:10Z","score":64},{"id":"doaj_10.5304/jafscd.2019.084.021","title":"Cultivating a Network of Citizen-Scientists to Track Change in the Sonora-Arizona Foodshed","authors":[{"name":"Megan A. Carney"},{"name":"Keegan C. Krause"}],"abstract":"Over the past couple of years, the University of Arizona has launched both a new under­graduate degree program in Food Studies and a Center for Regional Food Studies (CRFS). The mission of the CRFS is “to integrate social, behavioral, and life sciences into interdisciplinary studies and community dialogue regarding change in regional food systems. We involve students and faculty in the design, implementation, and evalua­tion of pilot interventions and participatory community-based research in the Arizona-Sonora borderlands foodshed surrounding Tucson, a UNESCO-designated City of Gastronomy, in a manner that can be replicated, scaled up, and applied to other regions globally.”\n\r\n\nThe CRFS’s annual State of the Tucson Food System (STFS) report seeks to support the efforts of diverse social actors and institutions working across various sectors of the Sonora-Arizona borderlands foodshed by collecting and synthe­sizing the most recent data available to underscore successes, problems, and barriers. The intended use of the report is to help inform policy at various scales and within both informal and formal policy settings. . . .","source":"DOAJ","year":2019,"language":"","subjects":["Agriculture","Human settlements. Communities"],"doi":"10.5304/jafscd.2019.084.021","url":"https://www.foodsystemsjournal.org/index.php/fsj/article/view/687","is_open_access":true,"published_at":"","score":63},{"id":"doaj_10.14710/tataloka.21.2.371-380","title":"SOUNDCSAPE AND THE UNDERSTANDING OF HISTORIC DISTRICTS IN BANDUNG","authors":[{"name":"Widjaja Martokusumo"},{"name":"Heru W Poerbo"},{"name":"Joko Sarwono"},{"name":"Anugrah S. Sudarsono"},{"name":"Ni Putu Amanda Nitidara"},{"name":"Michael Isnaeni Djimantoro"},{"name":"Amanda Arifiana"},{"name":"Feysa A. Poetry"}],"abstract":"According to UNESCO Convention 1972, cultural heritage consists of tangible and intangible heritage. Soundscape has been considered as a part of the intangible heritage, and it refers to the perceptual quality. In the realm of built environment, perceptual qualities become important concerns, since cultural heritage cannot be described and appreciated using mono-sensorial analysis fundamentally based on vision. As perceptual construct, soundscape has been considered as a new approach in understanding the formation and design of sensitive urban environment. It is argued that perceptual quality, besides visual aesthetics, geographic, psychological and socio-cultural aspects, must be part of the considerations in architecture and urban design. Bandung is well-known for its urban heritage, and as former well-designed colonial town, the historic buildings and areas have morphologically constituted the structure of the inner city. However, the modernization and globalization have led to inevitable transformations, including the destruction of historic places and fabric/district of cultural significance. With the latest urban dynamics, urban environment has also experienced an inescapable process of “sound globalization”, which led to the losing of specific sound-marks in the respective area. This paper is based upon an ongoing research project on strategy for conservation of historic urban areas using soundscape approach. Methodologically, through sound walks, surveys and interviews, several notions relating to urban spatial and formal quality have been collected, assessed and interpreted. The result stands for the understanding of perceptual aspects and quality of urban space in historic urban areas that may contribute to the heritage conservation strategy.","source":"DOAJ","year":2019,"language":"","subjects":["Regional planning","City planning"],"doi":"10.14710/tataloka.21.2.371-380","url":"https://ejournal2.undip.ac.id/index.php/tataloka/article/view/4457","is_open_access":true,"published_at":"","score":63},{"id":"arxiv_1910.13803","title":"Rank-size law, financial inequality indices and gain concentrations by cyclist teams. The case of a multiple stage bicycle race, like Tour de France","authors":[{"name":"Marcel Ausloos"}],"abstract":"This note examines financial distributions to competing teams at the end of the most famous multiple stage professional (male) bicyclist race, TOUR DE FRANCE. A rank-size law (RSL) is calculated for the team financial gains. The RSL is found to be hyperbolic with a surprisingly simple decay exponent (about equal to -1). Yet, the financial gain distributions unexpectedly do not obey Pareto principle of factor sparsity. Next, several (8) inequality indices are considered : the Entropy, the Hirschman-Herfindahl, Theil, Pietra-Hoover, Gini, Rosenbluth indices, the Coefficient of Variation and the Concentration Index are calculated for outlining diversity measures. The connection between such indices and their concentration aspects meanings are presented as support of the RSL findings. The results emphasize that the sum of skills and team strategies are effectively contributing to the financial gains distributions. From theoretical and practical points of view, the findings suggest that one should investigate other \"long multiple stage races\" and rewarding rules. Indeed, money prize rules coupling to stage difficulty might influence and maybe enhance (or deteriorate) purely sportive aspects in group competitions. Due to the delay in the peer review process, the 2019 results can be examined. They are discussed in an Appendix; the value of the exponent (-1.2) is pointed out to mainly originating from the so called \"king effect\"; the tail of the RSL rather looks like an exponential.","source":"arXiv","year":2019,"language":"en","subjects":["physics.soc-ph","q-fin.ST"],"doi":"10.1016/j.physa.2019.123161","url":"https://arxiv.org/abs/1910.13803","pdf_url":"https://arxiv.org/pdf/1910.13803","is_open_access":true,"published_at":"2019-10-24T21:37:59Z","score":63},{"id":"arxiv_1909.10940","title":"Structure constants for Chern classes of Schubert cells","authors":[{"name":"Changjian Su"}],"abstract":"A formula for the structure constants of the multiplication of Schubert classes is obtained in arXiv:1909.05283. In this note, we prove analogous formulae for the Chern--Schwartz--MacPherson (CSM) classes and Segre--Schwartz--MacPherson (SSM) classes of Schubert cells in the flag variety. By the equivalence between the CSM classes and the stable basis elements for the cotangent bundle of the flag variety, a formula for the structure constants for the latter is also deduced.","source":"arXiv","year":2019,"language":"en","subjects":["math.AG","math.CO"],"url":"https://arxiv.org/abs/1909.10940","pdf_url":"https://arxiv.org/pdf/1909.10940","is_open_access":true,"published_at":"2019-09-24T14:07:55Z","score":63},{"id":"arxiv_1905.00074","title":"On divisorial (i) classes","authors":[{"name":"Olivia Dumitrescu"},{"name":"Nathan Priddis"}],"abstract":"In this paper we introduce and study divisorial (i) classes} for the blow up of projective space in several points for i=-1,0 and 1. We generalize Noether's inequality, and we prove that all divisorial (i) classes are in bijective correspondence with the orbit of the Weyl group action on one exceptional divisor following Nagata's original approach. Moreover, we prove that the irreducibility condition from the definition of divisorial (i) classes can be replaced by the numerical condition of having positive intersection with all divisorial (i) classes of smaller degree via the Mukai pairing.","source":"arXiv","year":2019,"language":"en","subjects":["math.AG"],"url":"https://arxiv.org/abs/1905.00074","pdf_url":"https://arxiv.org/pdf/1905.00074","is_open_access":true,"published_at":"2019-04-30T19:41:33Z","score":63},{"id":"crossref_10.4000/bresils.2453","title":"Classes sociales, races et nation au Brésil","authors":[{"name":"Antonio Sérgio Alfredo Guimarães"}],"abstract":"Aujourd’hui, les sciences sociales ne peuvent plus penser la formation des groupes comme le résultat de la mobilisation collective ou du développement de plusieurs champs théoriques indépendamment de leurs intersections avec plusieurs dimensions d’agency et de détermination structurelle. Dans cet article, je défends la thèse selon laquelle les interactions entre les processus de formation de classe et de race doivent être examinées dans leurs tensions avec le cadre plus général du processus de formation nationale. Je m’attache, particulièrement, à la façon dont, au Brésil, racialisation et formation de classes sont structurés par l’appartenance nationale qui, elle-même, se construit en relation avec un idéal particulier de classe sociale et de dénégation de races. À cette fin, j’utilise librement le concept de racialisation développé en sociologie par Michael Barton, ceux de formation de classes (Adam Przeworski) et de formation raciale (Omi \u0026 Winnant).","source":"CrossRef","year":2018,"language":"en","subjects":null,"doi":"10.4000/bresils.2453","url":"https://doi.org/10.4000/bresils.2453","is_open_access":true,"citations":2,"published_at":"","score":62.06},{"id":"arxiv_1812.00769","title":"Testing Changes in Communities for the Stochastic Block Model","authors":[{"name":"Aditya Gangrade"},{"name":"Praveen Venkatesh"},{"name":"Bobak Nazer"},{"name":"Venkatesh Saligrama"}],"abstract":"We propose and analyze the problems of \\textit{community goodness-of-fit and two-sample testing} for stochastic block models (SBM), where changes arise due to modification in community memberships of nodes. Motivated by practical applications, we consider the challenging sparse regime, where expected node degrees are constant, and the inter-community mean degree ($b$) scales proportionally to intra-community mean degree ($a$). Prior work has sharply characterized partial or full community recovery in terms of a \"signal-to-noise ratio\" ($\\mathrm{SNR}$) based on $a$ and $b$. For both problems, we propose computationally-efficient tests that can succeed far beyond the regime where recovery of community membership is even possible. Overall, for large changes, $s \\gg \\sqrt{n}$, we need only $\\mathrm{SNR}= O(1)$ whereas a naïve test based on community recovery with $O(s)$ errors requires $\\mathrm{SNR}= Θ(\\log n)$. Conversely, in the small change regime, $s \\ll \\sqrt{n}$, via an information-theoretic lower bound, we show that, surprisingly, no algorithm can do better than the naïve algorithm that first estimates the community up to $O(s)$ errors and then detects changes. We validate these phenomena numerically on SBMs and on real-world datasets as well as Markov Random Fields where we only observe node data rather than the existence of links.","source":"arXiv","year":2018,"language":"en","subjects":["cs.IT","cs.LG","cs.SI","math.ST"],"url":"https://arxiv.org/abs/1812.00769","pdf_url":"https://arxiv.org/pdf/1812.00769","is_open_access":true,"published_at":"2018-11-29T20:09:21Z","score":62},{"id":"doaj_10.22481/odeere.v0i2.1555","title":"Memória, História Oral e Patrimônio Imaterial Afro-brasileiro: teoria, práxis","authors":[{"name":"Leandro Seawright Alonso"}],"abstract":"Neste artigo, demonstrei a relação entre a Memória, a História Oral e o Patrimônio Imaterial Afro-brasileiro. Apontei para os aspectos teóricos e para a práxis de uma História Oral capaz de oferecer algumas bases para a salvaguarda do Patrimônio Imaterial. Para tanto, propus um diálogo dinâmico com diferentes conceitos de Memória, sobretudo conforme compreendida por Joël Candau e Maurice Halbwachs. Apresentei diferentes conceitos em diálogo com autores especialistas em Patrimônio Imaterial, como: Maria Amélia Jundurian Corá, Chiara Bortolotto e Ulpiano Toledo Bezerra de Menses. Além disso, identifiquei procedimentos construídos por José Carlos Sebe Bom Meihy, Suzana Lopes Salgado Ribeiro e Fabíola Holanda no âmbito do Núcleo de Estudos em História Oral – NEHO/USP.\n\r\nPalavras-chave: Memória, História Oral, Patrimônio Imaterial, Teoria.","source":"DOAJ","year":2017,"language":"","subjects":["Ethnology. Social and cultural anthropology","Human settlements. Communities"],"doi":"10.22481/odeere.v0i2.1555","url":"http://200.128.67.20/ojs-3-2-1-1/index.php/odeere/article/view/1555","is_open_access":true,"published_at":"","score":61},{"id":"doaj_10.5922/2079-8555-2017-3-1","title":"The Baltics on Their Way towards a Circular Economy","authors":[{"name":"Grigoryan A. A."},{"name":"Borodavkina N. U. "}],"abstract":"Circular economy has been studied extensively both in Europe and worldwide. It is largely viewed as a potential strategy for societal development, aimed to increase prosperity while reducing dependence on raw materials and energy. Many businesses regard circular economy as a way to enhance economic growth and increase profits. Governments across the world actively engage in the discussion about the benefits of a transition to a circular economy and about its impact on employment, economic growth, and the environment. This paper aims to study the major issues of circular economy, to identify its advantages, and to offer an insight into the transition stage the Baltic States are undergoing today on their way to circular economy. It is stressed that the Baltic countries are not fully using the opportunities offered by a circular economy. For example, Latvia’s, Lithuania’s, and Estonia’s recycling rates are significantly below those of other European countries. The Baltics depend heavily on EU financial support. An increase in funding will contribute to the implementation of circular economy technologies.","source":"DOAJ","year":2017,"language":"","subjects":["Regional economics. Space in economics"],"doi":"10.5922/2079-8555-2017-3-1","url":"https://journals.kantiana.ru/upload/iblock/fae/Grigoryan%20A.%20A.,%20Borodavkina_4-14.pdf","is_open_access":true,"published_at":"","score":61}],"total":437837,"page":1,"page_size":20,"sources":["CrossRef","DOAJ","arXiv"],"query":"Communities. Classes. Races"}