bluuebunny/crossref_metadata_2025_split huggingface dataset:
No-regret Control for a degenerate population model in divergence form with missing birth rate: a nonlinear case
Authors: Sana Mohamed , Sawadogo Somdouda , Tao Sadou 
Published: February 2023

We deal with a degenerate population equation in divergence form depending on time, on age and on space. In this model, the birth rate is unknown. We focus on the No-regret control and on the Low-regret control concepts of J. L. Lions treated in [ContrÃ´le Ã moindres regrets des systÃ¨mes distribuÃ©s, C. R. Acad. Sci.Paris Ser. I Math., SIAM J. Control Optim. ,1992, Vol 315, pp. 1253â€“1257] and in [Duality arguments for multi-agents least regret control, Institut de France, 1999] to treat the problem. For this purpose, we prove first the existence of the Low-regret control and the No-regret control. And we use a suitable Hilbert space to show that the No-regret control is the limit of a family of adapted Low-regret controls defined by a quadratic pertubation and previously used by Nakoulima et al. in [Perturbations Ã moindres regrets dans les systÃ¨mes distribuÃ©s Ã donnÃ©es manquantes, C. R. Acad. Sci.Paris Ser. I Math., 2000, Vol 330, pp. 801â€“806]. Then we give a singular optimality system for the family of adapted Low-regret controls and for the No-regret control.
De-Westernisasi Konsep Manusia: Menelaah Konsep Syed Naquib Al-Attas tentang Hakikat Manusia
Authors: Sandimula Nur Shadiq 
Published: February 2023

Syed Muhammad Naquib al-Attas, the renowned scholar of Islamization of Knowledge, has recognized the defect of the western worldview concerning man, which eventually brought havoc to humanity. Al-Attas' concept of the nature of man is encountered as a critique of the Western conception of man that causes epistemological-conceptual problems severely in the Islamic world. This article aims to conceptualize al-Attas' concept of human nature. This qualitative research employs the content analysis method of al-Attas works. It uses a descriptive-philosophical approach. The result shows that al-Attas conceptualized the concept of human nature based on the concept of insan, which is defined as a living being that speaks. The concept becomes the antithesis of the western worldview's concept of man. Man is a new creation associated with the duality of the soul in the human self. The reality of man is his articulate soul (nafs al-nathiqah), the soul that took Covenant (mitsaq) with God. This soul can overcome the animal's desire in his body through the purification of the soul to achieve a state of soul of tranquility (nafs al-muthmainnah). This state of the soul is marked by the tranquility of the soul and settled happiness (sa'adah).
Keywords: Syed Naquib Al-Attas, Islamization of science, humanity, western,eastern
Biomechanical analysis of different fixed dental restorations on short implants: a finite element study
Authors: Wagner Christian , Herberg Samira , Bourauel Christoph , Stark Helmut , Dörsam Istabrak 
Published: February 2023

Abstract

Objectives
Although the use of short implants is becoming more common for patients with atrophic alveolar ridges, their use is still quite limited. This is due to the lack of data of long-term survival compared to standard-length implants. The aim of this study was to determine the load in the bone and implant system with different superstructures.

Methods
Three kinds of prosthetic restorations were created on short implants based on CT-Data. Two short implants with different macro-geometries were used. The implants were inserted in idealised posterior lower mandibular segments and afterwards restored with a crown, a double splinted crown, and a bridge.

Results
The analysis was performed under load of 300 N either divided between a mesial and distal point or as a point load on the pontic/mesial crown. The different design of the implant systems had a noticeable influence on the stress in the cortical bone, in the implant system, and the displacement of the superstructure as well.

Conclusions
Compared with implants of standard length, higher stresses were observed, which can lead early failure of the implant during the healing period or a late cervical bone resorption. Precise indications are essential for short implants to avoid the failure of short implants.
Robust Finite Element Discretization and Solvers for Distributed Elliptic Optimal Control Problems
Authors: Langer Ulrich , Löscher Richard , Steinbach Olaf , Yang Huidong 
Published: February 2023

Abstract
We consider standard tracking-type, distributed elliptic optimal control problems with

L
2

L^{2}

regularization, and their finite element discretization.
We are investigating the

L
2

L^{2}

error between the finite element approximation

u

ϱ
⁢
h

u_{\varrho h}

of the state

u
ϱ

u_{\varrho}

and the desired state (target)

u
¯

\overline{u}

in terms of the regularization parameter 𝜚 and the mesh size ℎ that leads to the optimal choice

ϱ
=

h
4

\varrho=h^{4}

.
It turns out that, for this choice of the regularization parameter, we can devise simple Jacobi-like preconditioned MINRES or Bramble–Pasciak CG methods that allow us to solve the reduced discrete optimality system in asymptotically optimal complexity with respect to the arithmetical operations and memory demand.
The theoretical results are confirmed by several benchmark problems with targets of various regularities including discontinuous targets.
Transient subordinate clauses in Balkan Turkic in its shift to Standard Average European subordination. Dialectal and historical evidence
Authors: Keskin Cem 
Published: February 2023

Abstract
The Turkic varieties of the Balkans use two main diametrically opposed subordination strategies: (i) the Turkic model, where typical subordinate clauses are prepositive, nonfinite, contain clause-final subordinators, etc. and (ii) the Indo-European model, where typical subordinate clauses are postpositive, finite, contain clause-initial subordinators, etc. The paper observes that Balkan Turkic additionally uses several kinds of subordinate clause that allow for problematic mixtures of these two models (‘X-clauses’). Spread over a spectrum between the Turkic and Indo-European extremes, X-clauses can, for instance, be prepositive but contain clause-initial subordinators. The paper, then, hypothesizes that X-clauses emerge due to uncertainties in the structural parameters of the Balkan Turkic subordination system. Such uncertainties are typical of complex systems undergoing change and arise in the present case due to the shift in Balkan Turkic away from Turkic towards Indo-European subordination.
Exergy analysis of a conceptual CO2 capture process with an amine-based DES
Authors: Ali Emad , Hadj-Kali Mohamed K. , Mokraoui Salim , Khan Rawaiz , Aldawsari Meshal , Boumaza Mourad 
Published: February 2023

Abstract
The energy efficiency of an absorption–desorption system for carbon dioxide capture from flue gas utilizing methyltriphenylphosphonium bromide-monoethanolamine (MEA) deep eutectic solvent is investigated in this article. According to the results, when the working pressure of the absorber column increases, the process becomes significantly exergy deficient, with an exergy loss of 7.63 MW compared to 5.7 MW for a normal MEA process. The majority of the exergy deficit is due to flue gas compression effort, which accounts for 99% of the total process exergy. The process’s exergy shortfall can be improved by lowering the absorber pressure from 10 to 3 atm, lowering the carbon dioxide removal efficiency from 90% to 60%, and increasing the solvent-to-gas ratio from 075 to 7.05. Furthermore, the incorporation of an energy recovery device could allow for an 80–90% reduction in the energy consumed by the gas compressor when running at 10 atm, from 5.7 to 1.2 MJ‧kg CO2
−1. With this adjustment, the deep eutectic solvent-based process can match or outperform the corresponding aqueous alkanolamine solvent-based process in terms of exergy destruction and specific energy consumption.
Synthesis and efficient electrocatalytic performance of Bi2O3/Dy2O3 nanoflakes
Authors: Wang Xiaoyu , Sun Zizhan , Yu Chunhu , Cai Zhengyu , Fan Chuangang , Pei Lizhai 
Published: February 2023

Abstract
Bi2O3/Dy2O3 nanoflakes with triclinic Bi2O3 and cubic Dy2O3 phases were synthesized by a hexadecyl trimethyl ammonium bromide (CTAB)-assisted hydrothermal route. The Bi2O3/Dy2O3 nanoflakes were analyzed by X-ray diffraction, X-ray photoelectron spectroscopy, electron microscopy and electrochemical impedance spectroscopy. The size of the Bi2O3/Dy2O3 nanoflakes with curled surface is about 2 μm and thickness is about 25 nm. X-ray photoelectron spectroscopy confirms the chemical composition of the Bi2O3/Dy2O3 nanoflakes. The formation process of the Bi2O3/Dy2O3 nanoflakes was investigated by controlling the CTAB concentration, reaction temperature and reaction time. The formation of the Bi2O3/Dy2O3 nanoflakes depends on CTAB. The results of cyclic voltammetry (CV) and electrochemical impedance spectroscopy demonstrate good electro-catalytic activity of the Bi2O3/Dy2O3 nanoflakes towards L-cysteine with a pair of quasi-reversible CV peaks at +0.01 V and –0.68 V, respectively. Bi2O3/Dy2O3 nanoflakes modified electrode detects L-cysteine linearly over a concentration ranging from 0.001 to 2 mM with a detection limit of 0.32 μM. The proposed nanocomposites modified electrode possesses good reproducibility and stability which can be used as a promising candidate for L-cysteine detection.
A calculation method for GNSS positioning precision based on the posteriori unit weight variance
Authors: Zheng Yifan , Yu Xianwen , Wang Jiafu 
Published: February 2023

Abstract
The precision index is the primary basis for judging the GNSS positioning result, and the positioning mean error is usually used as the precision index in practical applications. In order to solve the problem of mismatch between positioning deviation and mean error in the priori situation, this paper proposed a positioning precision calculation method based on the posteriori unit weight variance and deduced the formulas combining sequential adjustment or Kalman filter, respectively. This method uses the characteristic that there are system errors in error corrections to calculate and screen the posterior unit weight variance. This method introduces the system error’s influence into the mean error, which can improve positioning precision. The application of static difference and RTK proved that this method has remarkable effects, which can significantly alleviate the problem of false high precision and improve the reliability of positioning mean errors.
Experimental Investigation and Energy Evolution of Brittle Limestone Subjected to Multistage Cyclic Loading
Authors: Liu Shiqi , Wang Huanling , Qu Xiao , Cheng Zhichao 
Published: February 2023

Abstract
In earthquake engineering, dynamic response of rock is a hot topic for investigating rock mechanism characteristics. In this article, limestone collected from the Hongshiyan landslide area induced by the 2014 “8.03” Ludian earthquake in southwest China is used to conduct multi-stage cyclic loading tests. The test results show that as confining pressure, loading frequency, and stress amplitude increase, the dynamic elastic modulus increases gradually. Damping parameters are dependent on confining pressure and can be divided into two evolution modes. Three stages can be obtained based on the residual strain curve, including stable, slow increase, and rapid increase, which correspond to the rock failure process. In addition, energy evolution characteristics are analyzed to express the influence of loading strategies. Dissipated energy gradually accumulates linearly, but stress amplitude and cyclic number promote it.
Two antagonistic response regulators control Pseudomonas aeruginosa polarization during mechanotaxis
Authors: Kühn Marco J , Macmillan Henriette , Talà Lorenzo , Inclan Yuki , Patino Ramiro , Pierrat Xavier , Al‐Mayyah Zainebe , Engel Joanne N , Persat Alexandre 
Published: February 2023

AbstractThe opportunistic pathogen Pseudomonas aeruginosa adapts to solid surfaces to enhance virulence and infect its host. Type IV pili (T4P), long and thin filaments that power surface‐specific twitching motility, allow single cells to sense surfaces and control their direction of movement. T4P distribution is polarized to the sensing pole by the chemotaxis‐like Chp system via a local positive feedback loop. However, how the initial spatially resolved mechanical signal is translated into T4P polarity is incompletely understood. Here, we demonstrate that the two Chp response regulators PilG and PilH enable dynamic cell polarization by antagonistically regulating T4P extension. By precisely quantifying the localization of fluorescent protein fusions, we show that phosphorylation of PilG by the histidine kinase ChpA controls PilG polarization. Although PilH is not strictly required for twitching reversals, it becomes activated upon phosphorylation and breaks the local positive feedback mechanism established by PilG, allowing forward‐twitching cells to reverse. Chp thus uses a main output response regulator, PilG, to resolve mechanical signals in space and employs a second regulator, PilH, to break and respond when the signal changes. By identifying the molecular functions of two response regulators that dynamically control cell polarization, our work provides a rationale for the diversity of architectures often found in non‐canonical chemotaxis systems.
The Child and Family Traumatic Stress Intervention in Canadian child and youth advocacy centres
Authors: Davidson Laura 
Published: February 2023

Background: The Child and Family Traumatic Stress Intervention (CFTSI) is an evidence-based early intervention shown to reduce post-traumatic stress in children and adolescents. This intervention has not been explored in the context of the Canadian healthcare landscape, and more specifically at Child and Youth Advocacy Centres (CYACs); multi-disciplinary service hubs who serve those exposed to trauma. Objective: Examine the feasibility and usefulness of the CFTSI in the context of Canadian CYACs. Methods: A mixed-methods design was utilized, consisting of a validated, nationally distributed online survey which served as an environmental scan, and key informant interviews, which were thematically analyzed. Results: 15 of 29 invited centres participated. Prior to this study, six of 15 respondents had been aware of the CFTSI. Furthermore, two participants reported current use of the CFTSI. Of the 13 centres not using it, 10 expressed that the CFTSI would be an acceptable and relevant intervention at their centre, and there was significant interest in possible future implementation. Interviews with experienced clinicians revealed benefits and challenges of the CFTSI’s format, and the influence of family structure, culture and trauma history on outcomes. Finally, some considerations specific to Canadian centres were uncovered and direction for future research suggested. Conclusion: Our findings collectively underscore the potential of the CFTSI to bolster mental health services, which are a priority area requiring improvement at Canadian CYACs. Additionally, this study highlights benefits and challenges relevant to Canadian practice and wide-spread implementation of the CFTSI in this country.
Irisin modulates glucose metabolism and inhibits steroidogenesis in bovine granulosa cells
Authors: Daudon Mathilde , Ramé Christelle , Price Christopher , Dupont Joëlle 
Published: February 2023

In brief
Fertility in the dairy cow is low during the post-partum period of negative energy balance and high plasma irisin concentrations. This study shows irisin modulates granulosa cell glucose metabolism and impairs steroidogenesis.

Abstract
Fibronectin type III domain-containing 5 (FNDC5) is a transmembrane protein discovered in 2012 that is cleaved to release the adipokine-myokine, irisin. Originally described as an exercise hormone that browns white adipose tissue and increases glucose metabolism, irisin secretion also increases during periods of rapid adipose mobilization, such as the post-partum period in dairy cattle when ovarian activity is suppressed. The effect of irisin on follicle function is unclear and may be species-dependent. In this study, we hypothesized that irisin may compromise granulosa cell function in cattle using a well-established in vitro cell culture model. We detected FNDC5 mRNA and both FNDC5 and cleaved irisin proteins in follicle tissue and in follicular fluid. The abundance of FNDC5 mRNA was increased by the treatment of cells with the adipokine visfatin but not by other adipokines tested. The addition of recombinant irisin to granulosa cells decreased basal and insulin-like growth factor 1- and follicle-stimulating hormone-dependent estradiol and progesterone secretion and increased cell proliferation but had no effect on viability. Irisin decreased GLUT1, GLUT3, and GLUT4 mRNA levels in granulosa cells and increased lactate release in the culture medium. The mechanism of action is in part through MAPK3/1 but not Akt, MAPK14, or PRKAA. We conclude that irisin may regulate bovine folliculogenesis by modulating granulosa cell steroidogenesis and glucose metabolism.
Unwirksamkeit einer Klausel zur Veräußerung von verpfändeten Wertpapieren bei Unterdeckung eines Lombardkredits
Authors: Raetz Marius 
Published: February 2023

Zusammenfassung
Effektenlombardkredite („margin loans“) sind eine Ausprägung des besicherten Darlehensgeschäfts. Sie ermöglichen den fremdfinanzierten Erwerb von Wertpapieren: Die Bank verschafft dem Kunden Kredit gegen Verpfändung der erworbenen Wertpapiere. Bei Wertverfall der Aktien ist die Bank auf eine kurzfristige Verwertung der Wertpapiere angewiesen. Der Aufsatz zeigt auf, welche Hindernisse das deutsche Recht für eine solche Verwertung aufstellt und ordnet die Folgen für die Praxis ein.
ВИВЧЕННЯ СТРУКТУРИ ТА ТЕРМІЧНИХ ВЛАСТИВОСТЕЙ ЗАЛІЗОВМІСНИХ СОРБЕНТІВ НА ОСНОВІ ПАЛИГОРСЬКІТУ ДЛЯ ВИЛУЧЕННЯ ІОНІВ Cr(VI) ТА U(VI)
Authors: Жданюк Наталія В. , Баранюк Євген О. 
Published: February 2023

Мета. Дослідження структури, термічних та сорбційних властивостей залізовмісного сорбенту на основі палигорськіту. Методи. Для дослідження собентів використано РФА та мікроскопічні дослідження. Термічний аналіз проведено з метою уточнення структури матеріалів та встановлення температурних інтервалів сушіння та утилізації сорбентів. Для вивчення сорбційних властивостей матеріалів використано спектрофоториметричний метод. Результати. РФА отриманого матеріалу підтвердив, що частинки нанорозмірного нуль-валентного заліза закріпилися на поверхні палигорськіту. Трансмісійна електронна мікроскопія зразків підтвердила, що нанорозмірне нуль-валентне залізо утворює сферичні частинки, що розміщуються у вигляді агрегатів та ланцюгів. Отриманий композит характеризується рівномірним розподілом часточок нанорозмірного нуль-валентного заліза на поверхні палигорськіту. Термічний аналіз залізовмісного композиту на основі палигорськіту підтвердив, що до 170 °С відбувається виділення лише фізично зв’язаної води, що дозволяє обґрунтувати максимальну температуру сушіння матеріалу. Структурне перетворення мінералу починає відбуватися при температурі вище 960 °С. За цих умов відбувається утворення нових фаз, що підтверджує можливість утилізації відпрацьованих сорбентів за керамічною технологією. Екзотермічні ефекти, що відповідають температурам окиснення заліза у сорбентах дозволяють
стверджувати, що розміри частинок заліза у залізовмісному композиті менша за розмір нанорозмірного нуль-валентного заліза, отриманого із розчину ферум(ІІ) сульфату. Ці дані, також підтверджують результати РФА. Сорбційні експерименти підтвердили, що синтезований композит ефективно видаляє Cr(VI) та U(VI) із водних середовищ при значеннях рН близьких до природних вод. Аналіз результатів сорбційних досліджень зразків висушених при температурах від 60 до 100 °C показав, що оптимальна температура сушіння залізовмісного композиту на основі палигорськіту за інших рівних умов синтезу становить 80 °C. Висновки. Вивчено структуру залізовмісного композиту. Встановлена максимальна температура сушіння синтезованих сорбентів та можливість утилізації відпрацьованих сорбентів по керамічній технології Підтверджено, що залізовмісний сорбент ефективно вилучає іонів важких металів та радіонуклідів з водних середовищ по сорбційно-відновлювальному механізму.
СПІВПОЛІМЕРИ МАЛЕЇНОВОГО АНГІДРИДУ І СТИРОЛУ ТА ІОНООБМІННІ ПЛІВОЧНІ МАТЕРІАЛИ НА ЇХ ОСНОВІ
Authors: Варлан Костянтин Є. , Шевцова Катерина Р. 
Published: February 2023

З метою визначення впливу природи розчинника на молекулярну масу синтезовано співполімери стиролу і малеїнового ангідриду (SMA) та терполімери стиролу, малеїнового ангідриду і акрилонітрилу (SMN). Синтез здійснювали методом радикальної полімеризації в індивідуальних розчинниках або їх сумішах, що мають параметри розчинності за Гільдебрандом δі в межах 18.3 ÷ 20.55 МДж0.5м-1.5. Об’єкти дослідження вибрано з огляду на наявність в полімерних ланцюгах реакційноздатних ангідридних циклів. Показано, що ступінь полімеризації синтезованих сполук можна оцінити за близькістю внесків асоціативних параметрів розчинності δа/δ у відповідні параметри розчинності полімеру δ2 і розчинника δ1. Значення параметрів розчинності розраховано з огляду на тривимірну концепцію параметра розчинності М. Хансена та з використанням метода А. Аскадського. На основі синтезованих полімерних сполук і комерційних блокспівполімерів окисів етилену і пропілену отримано плівочні гнучкі матеріали з іонообмінними властивостями, у яких статична обмінна ємність має значення (4.28 ÷ 6.37) мекв/г. Визначено, що вміст гель-фракції матеріалів становить (86 ÷ 97) % і залежить від природи розчинника, з якого отримано плівки, а збільшенню вмісту гель-фракції сприяє близькість значень δа/δ розчинника і SMA/SMN. Досліджено здатність плівочних матеріалів до набрякання. Визначено, що за рН > 6 ступінь набрякання стрибкоподібно збільшується, а динаміка набрякання та її максимальне значення залежить від статичної обмінної ємності та вмісту оксіетиленових складових ланок у сітчастій структурі.
Two-area power system stability analysis by frequency controller with UPFC synchronization and energy storage systems by optimization approach
Authors: Kodeeswara Kumaran G. , Rajesh P. , Kumaravel Sureshkumar , Irusapparajan G. 
Published: February 2023

AbstractAn optimization approach for two-area power system with Unified Power Flow Controller (UPFC) is proposed in this paper. The proposed method is the Atomic Orbital Search (AOS) approach. The proposed approach is applied to achieve full utilization of UPFC and keeps the parameters uncertain. The multivariable PI controller is utilized to control the system controller and eliminates the negative interaction of the controllers. The proposed approach combines the two subsystems by converting algebraic subsystem using differential approximation, which leads to a nonlinear system. The proposed approach provides efficient voltage regulation and quicker damping of inter-area mode oscillations. The proposed UPFC controller eliminates generator oscillation and fault condition, which guarantee the stability of the system as well as provides dynamic power flow control under the tie-line. At last, the proposed method is simulated on MATLAB platform and compared with existing methods. From this comparison, it is shown that the proposed approach provides less oscillation than the existing approach.