Undistinguishing Statistics of Objectively Distinguishable Objects: Thermodynamics and Superfluidity of Classical Gas

V. P. Maslov

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Undistinguishing Statistics of Objectively Distinguishable Objects: Thermodynamics and Superfluidity of Classical Gas

Mathematical notes. 2013. Vol. 94. No. 5. P. 722–813.

In the present paper, we describe an approach to thermodynamics that does not involve Bogolyubov chains or Gibbs ensembles. We present isotherms, isochores, and isobars of various pure gases, as well as binodals, i.e., lines along which gas becomes liquid, and spinodals (endpoints of isotherms). We study supercritical phenomena for values of temperature and pressure above the critical ones. A lot of attention is paid to the region of negative pressures. The superfluid component for supercritical phenomena is described, as well as the thermodynamics of nanostructures and superfluidity in nanotubes.

Research target: Economics and Management Mathematics

Priority areas: economics IT and mathematics mathematics

Language: English

Full text

Keywords: number of degrees of freedom clusters spinodal fractional dimension binodal isotherms isochore distribution of Bose--Einstein type Poisson adiabat

Gender, performance, and prize money: a study of pay discrimination against female teams in eSports

Parshakov P., Humanities and Social Sciences Communications 2026 Vol. 13 No. 1 P. 1–7

This study investigates gender‑based disparities in viewership and prize money within Counter‑Strike: Global Offensive competitions, using data from the ESL Impact League (female‑only) and comparable male leagues. Because esports performance depends chiefly on strategic choices and fine motor skills rather than physical strength, this setting offers a distinctive lens for examining gender equity where bodily ...

Added: August 22, 2026

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Астафьева Е.В., Турунцева М. Ю., Экономический журнал Высшей школы экономики 2021 Т. 25 № 1 С. 65–101

В основе принятия своевременных экономико-политических решений и бизнес-планирования лежит мониторинг текущей ситуации и прогнозирование путей развития экономической активности, базу которых составляют официальные статистические оценки значений различных показателей. В этой связи переоценка данных и прогнозы, основанные на более ранних либо поздних оценках, потенциально могут повлечь за собой совершенно различные экономико-политические решения. Согласно официальной методике Росстата, публикуется ...

Added: August 21, 2026

On calibration of remote sensing retrievals of ecosystem respiration (Reco) with tower measurements over,Russian forests and wetlands

Shabanov N., Kuricheva O., Kurbatova J. et al., / Series Working Papers SSRN "Department of Economics Ca’ Foscari University of Venice". 2026.

The carbon balance of an ecosystem is the difference between Gross Primary Productivity (GPP) and Ecosystem Respiration (Reco) as expressed by Net Ecosystem Exchange (NEE). While remote sensing retrievals of GPP have reached maturity, Reco estimation remains underexplored and ultimately cast bias on NEE. Here we present an end-to-end multi-scale analysis of the mechanism of ...

Added: August 21, 2026

Оценка качества краткосрочных прогнозов некоторых российских экономических показателей (апрель 2009 г. - май 2022 г.)

Астафьева Е., Турунцева М., Научный вестник ИЭП им. Гайдара.ру (электронный журнал) 2022 № 7 С. 32–35

В статье приводятся результаты анализа качественных свойств прогнозов некоторых показателей, ежемесячно публикуемых Институтом экономической политики имени. Е.Т. Гайдара в «Научном вестнике ИЭП им. Гайдара.ру» (далее – «прогнозы ИЭП»). Мы рассматриваем простейшие статистики (MAPE, MAE, RMSE) как прогнозов ИЭП, так и альтернативных прогнозов (наивных, наивных сезонных и прогнозов, построенных с использованием скользящего среднего). Помимо сравнительного анализа на основе ...

Added: August 21, 2026

Оценка качества краткосрочных прогнозов некоторых российских экономических показателей (апрель 2009 г. - май 2021 г.)

Астафьева Е., Турунцева М., Научный вестник ИЭП им. Гайдара.ру (электронный журнал) 2021 № 7 С. 32–35

Added: August 21, 2026

Оценка качества краткосрочных прогнозов некоторых российских экономических показателей (апрель 2009 г. - ноябрь 2020 г.)

Астафьева Е., Турунцева М., Научный вестник ИЭП им. Гайдара.ру (электронный журнал) 2021 № 1 С. 32–35

Added: August 21, 2026

Повышение качества прогнозирования простейшими методами комбинирования отдельных прогнозов

Астафьева Е.В., Турунцева М. Ю., Прикладная эконометрика 2024 Т. 74 № 2 С. 78–103

Комбинирование прогнозов считается наиболее простым способом улучшения каче‑ ства прогнозирования по сравнению с индивидуальными моделями. В данной работе проверяются возможности простейших методов комбинирования, таких как простое среднее и оценки на основе среднеквадратической ошибки прогнозов предыдущих пери‑ одов, для улучшения качественных характеристик краткосрочных прогнозов пяти по‑ казателей цен на ресурсы (нефть и металлы). В основе работы ...

Added: August 21, 2026

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Астафьева Е.В., Турунцева М. Ю., Вестник Евразийской науки 2025 Т. 17 № 6

В работе исследуются возможности использования простых процедур корректировки и объединения прогнозов. Мы оцениваем влияние применения этих процедур (методов простой корректировки, простых и регрессионных методов комбинирования) на качество прогнозов показателей российского экспорта во все страны и импорта из всех стран. В общей сложности мы использовали четыре метода корректировки, 9 методов простого комбинирования и семь регрессионных методов. ...

Added: August 21, 2026

From data to knowledge: artificial intelligence methods for studying comorbidity in electronic health records

Лукьяненко Д. В., Ragimova A., Мухорина А. et al., European Physical Journal: Special Topics 2026 P. 1–24

Electronic health records (EHRs) contain vast volumes of clinical information that encode complex relationships between diseases. Traditional approaches to the analysis of interrelated or co-occurring diseases have focused on pairwise associations between diagnoses, missing the higher-order structures that characterise multimorbid patients. The present paper offers a narrative review of existing statistical, machine-learning, and artificial intelligence ...

Added: August 20, 2026

Monomial algebras and G_a^n-equivariant embeddings into toric varieties

Chernov A., European Journal of Mathematics 2026 Vol. 12 Article 48

An induced additive action on a projective variety is a regular action of the group G_a^n on X in P^n with an open orbit that can be extended to a regular action on P^n. Such actions are known to correspond to pairs (A, U), where A is a local algebra and U is a generating subspace lying in the maximal ideal. This paper ...

Added: August 19, 2026

Matveeva N., Yudkevich M., Higher Education 2026 P. 1–20

This study draws on neo-institutional theory and the convergence/divergence debate in higher education research to examine whether public and private universities in EU candidate countries converge or diverge in their research activity and collaboration patterns. We analyse Scopus-indexed publication data for 43 universities across Albania, Bosnia and Herzegovina, Georgia, North Macedonia and Serbia for the ...

Added: August 19, 2026

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Biryukova O. V., Barzunov D., Pautov A., Проблемы Дальнего Востока 2026 № 4

The formation of new transcontinental transport arteries intensifies geoeconomic competition in Eurasia and requires the development of sustainable models of investment cooperation. The Chinese Belt and Road Initiative and the International North—South Transport Corridor represent distinct institutional concepts for infrastructure financing, differing in their sources of capital, degree of centralization, and mechanisms of risk allocation. ...

Added: August 19, 2026

Dynamics of Systems, Mechanisms and Machines (Dynamics). International scientific and technical conference

IEEE Advancing Technology for Humanity, 2025.

Dynamics of Systems, Mechanisms and Machines (Dynamics) ...

Added: August 19, 2026

Hypergraphs from multivariate connectivity: caCOH-based EEG/MEG representation

Vlasenko D., Saranskaia I., Zakharov D., European Physical Journal: Special Topics 2026 P. 1–16

Hypergraphs provide a natural framework for representing neurophysiological interactions distributed across sets of sensors. A key methodological question is how hyperedges should be defined from frequency-resolved electroencephalography/magnetoencephalography (EEG/MEG) data. We demonstrate a construction strategy in which hyperedges are obtained from canonical coherence (caCOH), an extension of coherence that estimates coupling between multidimensional signal spaces. To ...

Added: August 18, 2026

La universidad de quinta generación Un paradigma centrado en la persona

Gaete Sepulveda M. A., Navarra: Eunsa, 2026.

Toward the Fifth-Generation University (5GU) is a work that proposes a transformative governance framework for institutions of higher education, capable of addressing the challenges of sustainability, digital reflexivity, and co-creation with multiple stakeholders. Drawing on a historical overview from University 1.0—focused on the preservation of knowledge—to University 5.0, the text presents a model centered on ...

Added: August 18, 2026

Global shifted potentials for moduli stacks of sheaves on Calabi-Yau four-folds

Borisov D., Katzarkov Ludmil, Sheshmani A. et al., American Journal of Mathematics 2026 Vol. 148 No. 4 P. 1075–1101

It is shown that there are globally defined Lagrangian distributions on the stable loci of derived \mathrm{Quot}-stacks of coherent sheaves on Calabi--Yau four-folds. Dividing by these distributions produces perfectly obstructed smooth stacks with globally defined -1-shifted potentials, whose derived critical loci give back the stable loci of smooth stacks of sheaves in global Darboux form. ...

Added: August 18, 2026

Which Model Families Pay? Econometric, Gradient Boosting and Recurrent Neural Network Volatility Forecasts in Active Trading Strategies on the Russian Stock Market

Lysenok N., International Journal of Computer Information Systems and Industrial Management Applications 2026 Vol. 18 No. 17s P. 533–549

This paper asks which families of volatility forecasting models create economic value in active trading, and through which integration channel that value is transmitted. Seven models drawn from four families — econometric (GJR-GARCH, HAR-J), gradient boosting (XGBoost, LightGBM), recurrent neural networks (LSTM, GRU) and a hybrid combining HAR-J with boosting — are compared on the ...

Added: August 18, 2026

Defining the Right Level of Risk in Organizational Innovation:Factors, Criteria, and Strategic Balance

Alena Bernyukevich, / Series WP BRP "Basic research program". 2025.

This essay explores the complex issue of determining the appropriate level of risk when implementing innovations within organizations. While innovation is widely recognized as a cornerstone of competitiveness, growth, and sustainability, excessive or poorly managed risk can lead to significant challenges. The discussion highlights key factors influencing acceptable risk levels, including alignment with corporate goals, ...

Added: August 17, 2026

Мегаполисы как центры научно-технической деятельности и инновационно-экономического пространства Китая

Бернюкевич Т. В., Bernyukevich A., Сунь Я., Вестник Московского государственного строительного университета 2026 Т. 21 № 1 С. 122–134

Введение. Актуальность исследования мегаполисов как центров научно-технической деятельности и инновационно-экономического пространства Китая определяется необходимостью изучения механизмов реализации государственной политики в экономической и социальной сферах, анализа принципов управления экономическими системами и оценки методов стратегического менеджмента в контексте инновационного развития. Цель исследования — выявление параметров и основных направлений развития китайских мегаполисов как инновационных центров. Материалы и методы. Применены методы: восхождения от абстрактного ...

Added: August 17, 2026

Three Algorithms for Merging Hierarchical Navigable Small World Graphs

Ponomarenko A., / Series Computer Science "arxiv.org". 2025.

This paper addresses the challenge of merging hierarchical navigable small world (HNSW) graphs, a critical operation for distributed systems, incremental indexing, and database compaction. We propose three algorithms for this task: Naive Graph Merge (NGM), Intra Graph Traversal Merge (IGTM), and Cross Graph Traversal Merge (CGTM). These algorithms differ in their approach to vertex selection ...

Added: July 30, 2026

Institutions, Normative Expectations, and Harassment Bribery: Evidence from a Three-country Experiment

Zhuravleva T., Afanasev K., Engelmann J. et al., / Series "SSRN Working Paper Series". 2026.

Extortionary ("harassment") bribery can persist even when widely condemned, consistent with a coordination problem sustained by beliefs about what others do and what others consider acceptable. We study whether a minimal institutional featurethe presence of a third-party monitor empowered to punish-shifts (i) normative expectations about extortion and compliance and (ii) empirical expectations about their prevalence. ...

Added: July 22, 2026

New bound on S1× S2-setting Bell locality of a nonseparable Werner state

Loubenets E. R., / Series arxiv.org "quant-ph". 2026. No. 2607.18050.

In many quantum applications it is important to know whether or not a Bell nonlocal two-qudit state exhibits its nonlocality under correlation scenarios with some given numbers S1,S2≥1 of generalized quantum measurements at two sites. In the present article, we find analytically a new general locality condition sufficient for a nonseparable Werner state with a ...

Added: July 21, 2026

On functional equations for Chow polylogarithms

Bolbachan V., / Series math "arxiv.org". 2024.

Chow polylogarithms are some special functions arising in explicit description of the Beilinson regulator map. The most interesting functional equation for this function reflects its vanishing on the boundary in the Bloch's cycle complex. We show that this functional equation formally follows from more simple ones, namely skew-symmetry, functoriality and multiplicativity. To prove this, we study ...

Added: July 16, 2026

On Goncharov’s conjecture in next to Milnor degree

Bolbachan V., / Series math "arxiv.org". 2024.

Let K be a field of characteristic zero. We prove that its motivic cohomology in degree m−1 and weight m is rationally isomorphic to the cohomology of the polylogarithmic complex. This gives a partial extension of A. Suslin theorem describing the indecomposable K3 of a field. ...

Added: July 16, 2026