bluuebunny/crossref_metadata_2025_split huggingface dataset:
Glucose and glycogen affects Ca2+transient during fatigue to a greater extent in the least than in the most fatigue resistant mouse FDB fibers
Authors: Hesse Erik , Ammar Tarek , Renaud Jean‐Marc 
Published: October 2024

AbstractThe overall objective was to determine how no extracellular glucose and/or low glycogen content affect fatigue kinetics in mouse flexor digitorum brevis (FDB) single muscle fibers. High glycogen content (Hi GLY), near normal in situ level, was obtained by incubating fibers in culture medium containing glucose and insulin while low glycogen content (Lo GLY), at about 19% of normal in situ level, was achieved by incubating fibers without glucose. Neither Lo GLY nor the absence of extracellular glucose (0GLU) affected tetanic [Ca2+]i prior to fatigue. The number of contracting unfatigued fibers versus stimulus strength relationship of Lo GLY‐0GLU fibers was shifted to higher voltages compared to Hi GLY fibers exposed to 5.5 mM glucose (5GLU). The relationship for Lo GLY‐0GLU fibers was shifted back toward that of Hi GLY‐5GLU fibers when glucose was reintroduced, whereas the removal of glucose from Hi GLY‐5GLU fibers had no effect. Fatigue was elicited with one 200 ms long tetanic contraction every s for 3 min. Both Lo GLY and 0GLU increased the rate at which intracellular tetanic concentration ([Ca2+]i) declined and unstimulated [Ca2+]i increased during fatigue in the order of the least fatigue resistant > mid fatigue resistant > the most fatigue resistant fibers.
Normalized solutions for the Kirchhoff equation with combined nonlinearities in ℝ4
Authors: Qiu Xin , Ou Zeng-Qi , Tang Chun-Lei , Lv Ying 
Published: October 2024

Abstract
In this article, we study the following Kirchhoff equation with combined nonlinearities:

−

a
+
b

∫

R

4

∣

∇

u
∣

2

d
x

Δ
u
+
λ
u
=
μ

∣
u
∣

q
−
2

u
+

∣
u
∣

2

u
,

in

R

4

,

∫

R

4

∣
u
∣

2

d
x
=

c

2

,

\left\{\begin{array}{l}-\left(a+b\mathop{\displaystyle \int }\limits_{{{\mathbb{R}}}^{4}}{| \nabla u| }^{2}{\rm{d}}x\right)\Delta u+\lambda u=\mu {| u| }^{q-2}u+{| u| }^{2}u,\hspace{1.0em}\hspace{0.1em}\text{in}\hspace{0.1em}\hspace{0.33em}{{\mathbb{R}}}^{4},\\ \mathop{\displaystyle \int }\limits_{{{\mathbb{R}}}^{4}}{| u| }^{2}{\rm{d}}x={c}^{2},\end{array}\right.

where

a
,
b
,
c
>
0

a,b,c\gt 0

,

μ
,
λ
∈
R

\mu ,\lambda \in {\mathbb{R}}

,

2
<
q
<
4

2\lt q\lt 4

. Under different assumptions on

b
,
c
>
0

b,c\gt 0

and

μ
∈
R

\mu \in {\mathbb{R}}

, we prove some existence, nonexistence, and asymptotic behavior of the obtained normalized solutions. When

μ
>
0

\mu \gt 0

:(i) for

2
<
q
<
3

2\lt q\lt 3

, we obtain the existence of a local minimizer ground-state solution and a mountain-pass-type solution, (ii) for

q
=
3

q=3

and

3
<
q
<
4

3\lt q\lt 4

, we obtain the existence of a mountain-pass type ground-state solution respectively, under different assumptions. When

μ
<
0

\mu \lt 0

and

2
<
q
<
4

2\lt q\lt 4

, we prove the nonexistence result of the aforementioned problem. We also investigate the asymptotic behavior of the normalized ground-state solutions, when

μ
→

0

+

\mu \to {0}^{+}

and

b
→

0

+

b\to {0}^{+}

, respectively.
IUPAC’s 2024 Top Ten Emerging Technologies in Chemistry
Authors: Gomollón-Bel Fernando 
Published: October 2024

Abstract

In 2019, the IUPAC started a quest to select the most interesting emerging technologies in the chemical sciences [1]. Now, this established initiative continues year after year—adding ideas to a list of innovations with an enormous potential to transform fields as diverse as materials science, energy, healthcare, agriculture and computing, among others [2]. Overall, the IUPAC “Top Ten Emerging Technologies in Chemistry” align with the United Nations’ Sustainable Development Goals, in a quest to secure a sustainable future and pave the way to a circular economy [3]. This new list delves into new materials, unexplored physical phenomena, and creative solutions to global challenges, including prevalent diseases and the still ongoing energy and fuel crisis. As in the first “Top Ten” paper, the technologies hover over a broad range of readiness—from laboratory discoveries to commercial realities, hence “emerging.” But all of them, carefully curated by a panel of experts nominated by IUPAC, are equally exciting. Read on.
A highly sensitive β-AKBA-Ag-based fluorescent “turn off” chemosensor for rapid detection of abamectin in tomatoes
Authors: Ahmad Touqeer , Mabood Fazal , Sarwar Rizwana , Khan Ajmal , Halim Sobia Ahsan , Rehman Najeeb Ur , Csuk Rene , Boque Ricard , Al-Harrasi Ahmed 
Published: October 2024

Abstract
This study presents the synthesis of a sensitive AKBA-Based fluorescent “Turn off” chemosensor for rapid detection of abamectin residues in tomatoes. Silver nanoparticles were synthesized by using 3-O-acetyl-11-keto-β-boswellic acid (β-AKBA) by chemical reduction method. The characterization of AKBA-AgNPs was performed by UV–vis spectroscopy, Fourier transform infrared spectroscopy (FTIR), and transmission electron microscopy (TEM). The average particle size of NPs was found to be 46.2 ± 2 nm with lumps of macro-sized particles. TEM data further revealed that nanoparticles were polydispersed and spherical in shape and also show good stability at high temperatures and pH. The biosensing properties of nanoparticles were studied for the detection of abamectin residues in tomato samples. Abamectin a natural product derived from the bacterium Streptomyces avermitilis is effective against a wide range of pests. In sensing protocol 67 organic tomato samples were segregated into 34 (safe group, without a spray of abamectin) and 33 samples (as an unsafe group, sprayed with abamectin insecticide solution). Emission spectra of these sample solutions were measured in the wavelength range of 450–530 nm, excitation wavelength was fixed at 488 nm. The effect of minor wavelength variation for the discrimination and classification of the two groups was investigated by applying two chemometric methods including partial least square discriminant analysis and principal component analysis with projection. The mechanism of its interaction between the AKBA-Ag NPs and abamectin residue was also established through UV/visible, FTIR, and TEM microscopy. This newly synthesized nanoparticle was found to have excellent stability at variables, i.e., temperature, storage period, salt concentration, and pH. Therefore, the synthesized Ag NPs are potential candidates for biosensing applications against abamectin.
Estimating Social Effects with Randomized and Observational Network Data
Authors: Chan TszKin Julian , Estrada Juan , Huynh Kim , Jacho-Chávez David , Lam Chungsang Tom , Sánchez-Aragón Leonardo 
Published: October 2024

Abstract
This paper introduces an innovative approach to identifying and estimating the parameters of interest in the widely recognized linear-in-means regression model under conditions where the initial randomization of peers determines the observed network. We assert that peers who are initially randomized do not produce social effects. However, after randomization, agents can endogenously develop significant connections that potentially generate peer influences. We present a moment condition that compiles local heterogeneous identifying information for all agents within the population. Under the assumption of ψ-dependence in the endogenous network space, we propose a Generalized Method of Moments (GMM) estimator, which is proven to be consistent, asymptotically normally distributed, and straightforward to implement using commonly available statistical software due to its closed-form expression. Monte Carlo simulations demonstrate the GMM estimator’s strong small-sample performance. An empirical analysis utilizing data from Hong Kong high school students reveals substantial positive spillover effects on math test scores among study partners in our sample, provided that their seatmates were exogenously assigned by their teachers.
Wide FOV metalens for near-infrared capsule endoscopy: advancing compact medical imaging
Authors: Moghaddasi Mojtaba , Perez Coca Erik Edilson , Ye Danni , Flores Diego Alejandro , Wu Xudong , Jalal Abdul , Ren Ziming , Abrinaei Fahimeh , Hu Bin 
Published: October 2024

Abstract
This study presents the design, fabrication, and characterization of a wide field-of-view (FOV) metalens optimized for capsule endoscopy. The metalens achieved a 165° FOV with a high modulation transfer function (MTF) of 300 lines per millimeter (lp/mm) across the entire FOV, operating in the near-infrared (NIR) narrow-bandpass imaging at 940 nm. The performance of the metalens-based system is evaluated using two bandwidths, 12 nm and 32 nm, showing MTF values of 0.2 and 0.3 at 250 lp/mm, respectively. The metalens-based system maintains a compact form factor with a total track length of 1.4 mm and a diameter of 1.58 mm. Compared to a traditional 108° FOV endoscope, the nano-optic capsule endoscope demonstrated superior performance in terms of FOV, contrast, and resolution. This advancement represents a significant step toward enhancing diagnostic capabilities in medical imaging, offering improved performance in a more compact package compared to conventional optics.
PLOMAT: plotting material flows of ‘commonplace’ Late Bronze Age seals in western Eurasia
Authors: Tsouparopoulou Christina , Maynard Glynnis , Russo Sergio G. 
Published: October 2024

AbstractSince the mid-twentieth century, the study of designs on seals has often focused on exotica and elite items. The PLOMAT project investigates visual and material communication outside of elite exchange networks during the Late Bronze Age in western Eurasia. The authors present results from plotting flows of ‘commonplace’ cylinder seals and those classified as ‘Common-Style Mittani’.
О ДВУХ КОНЦЕПЦИЯХ ОПИСАНИЯ КИНЕМАТИКИ ДЕФОРМИРОВАНИЯ СПЛОШНОЙ СРЕДЫ: ПОЛЕМ СМЕЩЕНИЙ ТОЧЕК И ПОЛЯМИ СМЕЩЕНИЙ МАТЕРИАЛЬНЫХ ПЛОЩАДОК
Authors: РЕВУЖЕНКО А.Ф. 
Published: October 2024

Рассмотрен метод описания кинематики деформирования, основанный на концепции смещения материальных площадок среды. Показано, что перемещения площадок описываются двумя векторными полями перемещений или, как альтернатива, одним тензорным полем, полем относительного смещения площадок. Тензор несимметричен, его компоненты не связаны условиями совместности Сен-Венана. Такой подход восстанавливает “равноправие” между кинематическим и силовым описанием процесса деформирования среды. Принятое понятие напряжений относится к силам, действующим на площадки внутри тела, а понятие деформаций - к изменению расстояний между парами точек. Приведен пример построения модели первоначально изотропной геосреды, в которой используется данное описание.
The author discusses the deformation kinematics method using the concept of displacement of material planes in a medium. Displacements of planes can be described by two vector fields of displacement or, by way of alternative, by one tensor field which is a field of relative displacement of planes. This is an asymmetric tensor, and its components are uncorrelated by Saint-Venant’s compatibility conditions. This approach recovers an “equality” between the kinematic-based and force-based descriptions of deformation in a medium. The adopted notion of stresses relates to the forces that affect planes inside a body, and the notion of deformation relates to the change of distances between pairs of points. The article gives a case-study of modeling an initially isotropic geomedium using this approach.
АНАЛИЗ ЗНАЧИМОСТИ ПАРАМЕТРОВ И УСЛОВИЙ НАГРУЖЕНИЯ НА ФОРМИРОВАНИЕ СТРУКТУРЫ СИЛОВЫХ ЦЕПОЧЕК ПРИ ВЫПУСКЕ РАЗДРОБЛЕННОЙ РУДНОЙ МАССЫ
Authors: ЧЭНЬ Ц. , ЛЮ Ц. , ЛУН Э. 
Published: October 2024

Выполнено моделирование процесса выпуска руды с одновременным магазинированием с использованием метода дискретных элементов на основе программного обеспечения PFC (Particle Flow Code). Методом ортогонального тестирования рассмотрены следующие ключевые факторы, влияющие на характер выпуска: толщина изоляционного слоя A , коэффициент трения на границе раздела изоляционного слоя B , коэффициент трения частиц между собой C , размер частиц D и коэффициент трения частиц о стенку E. Результаты ортогонального тестирования показали следующий порядок факторов по значимости: D>C>A>E>B . Наиболее оптимальная конфигурация факторов в рассмотренной численной модели составила: толщина изоляционного слоя 0.003 м; коэффициент трения на границе раздела изоляционного слоя 0.5; коэффициент трения частиц между собой 0.8; радиус частиц 0.008 м; коэффициент трения частиц о стенку 0.8.
The ore drawing procedure of the synchronous filling shrinkage mining method is simulated using PFC software. Isolation layer thickness A, isolation layer interface friction factor B, ore particle friction factor C , particle radius D and wall friction factor E are chosen as the five influencing factors of the orthogonal test, along with the characteristics of the orthogonal test and force chain parameters. The findings demonstrate that the primary and secondary order of each factor impact on the orthogonal test index is D>C>A>E>B. The best test configuration was A1 B2 C3 D3 E3, with the relevant factors being thickness 0.003 m, isolation layer interface friction factor 0.5, particle friction factor 0.8, particle radius 0.008 m and wall friction factor 0.8.
ВЛИЯНИЕ ПАРАМЕТРОВ РЕЗАНИЯ И РЕЖУЩЕГО ИНСТРУМЕНТА НА НАГРУЗКИ ПРИ РАЗРУШЕНИИ ТВЕРДЫХ ВКЛЮЧЕНИЙ В УГОЛЬНЫХ ПЛАСТАХ
Authors: ЛИННИК В.Ю. , ЛИННИК Ю.Н. 
Published: October 2024

Выполнены экспериментальные исследования по установлению влияния параметров резания и режущего инструмента на нагрузки при разрушении твердых включений. Установлено, что при центральном прорезании твердых включений максимальные нагрузки на резце зависят от толщины и ширины среза, а также схемы резания и не зависят от скорости резания. Увеличение ширины режущей части резца способствует росту пиковых и среднепиковых сил резания и подачи, тогда как боковые нагрузки при резании твердых включений резцами с плоской передней гранью зависят лишь от толщины стружки. На величину пиковых усилий подачи существенно влияет форма режущей кромки резца, а на усилия резания - угол резания. Уменьшение угла клина передней грани резца приводит к снижению пиковых усилий резания и подачи, тогда как боковые силы возрастают.
The experimental research assessed the influence exerted by the parameters of cutting process and cutting tool on the loads in cutting hard inclusions in rocks. It is found the in central cutting of hard inclusions, the maximal loads on a cutting pick depend on the width and depth of a cut, and on the cutting pattern, and are independent of the cutting velocity. The increase in the width of the cutting point of a cutting pick contributes to an increase in the peak and average-peak forces of cutting and feed, while the lateral loads in cutting hard inclusions by cutting picks with a flat face depend only on the depth of cut. The peak feed forces essentially depend on the shape of the cutting point of a cutting pick, and the cutting force depend on the angle of cutting. The decrease in the wedge angle of the face of a cutting pick reduces the peak forces of cutting and feed, while the lateral loads increase.
ОСОБЕННОСТИ СОСТАВА И СВОЙСТВ ХВОСТОВ ОБОГАЩЕНИЯ ЛОПАРИТОВЫХ РУД ОБОГАТИТЕЛЬНОЙ ФАБРИКИ “УМБОЗЕРО”
Authors: КРАСАВЦЕВА Е.А. , МАКСИМОВА В.В. 
Published: October 2024

Представлены результаты определения состава и свойств хвостов обогащения лопаритовых руд обогатительной фабрики “Умбозеро”, закрытой в 1999 г. В ходе исследования проведен отбор проб хвостов поверхностного слоя и с глубины методом “режущего кольца”. Исследованы инженерно-геологические характеристики, выполнен ситовой, химический, рентгенофазовый и радионуклидный анализы. Установлена неоднородность вещественного состава и свойств отходов обогащения. В минеральном составе хвостов преобладают нефелин и K, Na-полевые шпаты. Лопарит диагностирован методом рентгенофазового анализа в одной из четырех исследуемых областей хвостохранилища, с тенденцией к увеличению его содержания в тонкой фракции. Радионуклидный анализ определил радиево-ториевый характер радиоактивности исследуемых отходов обогащения.
The article reports the research of composition and properties of loparite concentration tailings at the Umbozero plant closed in 1999. During the research, samples of tailings were taken in the surface layer and at depth, using the method of cutting ring. The geological and engineering properties of the tailings were investigated, and the sizing, chemical, X-ray phase and radionuclide analyses were performed. The research revealed heterogeneity in material constitution and properties of the test tailings. The mineral composition of the tailings is dominated by nepheline, and by K and Na feldspars. Loparite is detected by the X-ray phase analysis at one of the four test sites of the tailings pond, and its content increases in the fine fraction. The analysis of radionuclides shows the presence of radium and thorium in the test concentration tailings.
ПОТЕНЦИАЛ ПОЛИМЕТАЛЛИЧЕСКИХ ХВОСТОХРАНИЛИЩ КАК ИСТОЧНИКА БАРИТОВОГО СЫРЬЯ
Authors: ШАВЕКИНА А.Ш. , ВОЛЫНКИН С.С. , БОНДАРЕНКО В.П. , БОРТНИКОВА С.Б. , ЮРКЕВИЧ Н.В. 
Published: October 2024

Рассмотрены возможности использования хвостохранилищ Талмовские пески и Урской отвал Кемеровской области в качестве техногенного объекта для получения баритового сырья посредством добычи и переработки. Оценены минералого-геохимические параметры и типоморфные характеристики барита согласно морфологии, минеральным ассоциациям, содержанию, распределению по гранулометрическим фракциям. Проведены технологические исследования и получены баритовые концентраты из вещества хвостохранилищ методами гравитации и флотации, которые охарактеризованы на соответствие по содержанию барита для дальнейшего применения в качестве утяжелителей буровых растворов по ГОСТ 4682-84. Выполнена оценка потенциала хвостохранилищ Талмовские пески и Урской отвал применительно к извлечению барита.
The research focuses on usability of tailings from the Talmovskie Peski and Ursk dumps in the Kemerovo Region as a manmade source of barite after suitable recovery and processing. Mineralogical, geochemical and typomorphic characteristics of barite are assessed from morphology, mineral associations, content and grain size distribution. The technological studies are accomplished, and barite concentrates are obtained from the test tailings by gravity separation and flotation. The concentrates are assessed with respect to barite content with a view to using the concentrates as a weighting material as per the USSR State Standard GOST 4682-84. The barite recovery potential of tailings from the Talmovskie Peski and Ursk dumps is evaluated.
АНАЛИЗ ВОЗДУХОРАСПРЕДЕЛЕНИЯ В НАКЛОННОЙ ГОРНОЙ ВЫРАБОТКЕ ПРИ НАЛИЧИИ ИНТЕНСИВНОГО ИСТОЧНИКА ТЕПЛОВЫДЕЛЕНИЯ
Authors: ПОПОВ М.Д. , СЕМИН М.А. , ЛЕВИН Л.Ю. 
Published: October 2024

Рассмотрено конвективное расслоение воздушных потоков в наклонной горной выработке в условиях наличия интенсивного источника тепловыделений. Методология исследования включала численное трехмерное моделирование нестационарных аэротермодинамических процессов в наклонной и примыкающей к ней горизонтальной горных выработках. Показаны три возможных сценария конвективного расслоения потоков в наклонной горной выработке в зависимости от мощности тепловыделений. Определена зависимость критической тепловой мощности источника нагрева от начальной депрессии и угла наклона горной выработки. Проанализирована зависимость перепада давления в наклонной выработке от массового расхода при разных мощностях тепловыделений по данным численного трехмерного моделирования, а также на одномерной сетевой модели. Описание подземных пожаров в горных выработках с помощью одномерных моделей требует привлечения эмпирических зависимостей аэродинамического сопротивления и средней плотности воздуха от расхода воздуха.
The authors analyze convection-induced stratification of air flows in an inclined drift with an intense heat emission source. The research methodology included 3D numerical modeling of nonstationary aero-thermodynamic processes in an inclined drift and in an adjoint horizontal drift. The article describes three possible scenarios of convection-induced air flow stratification in an inclined drift depending on heat emission intensity. The dependence of the critical heat rate of the heating source on the initial depression and incline of the drift is determined. The pressure difference-mass air flow relationship in the inclined drift is analyzed at different heat emission intensities using the 3D numerical model and a 1D network model. Description of underground mine fires using 1D models requires empirical relationships of air drag, average air density and air flow rate.
АЭРОДИНАМИЧЕСКИЕ ПРОЦЕССЫ В СВЕРХДЛИННОЙ УГОЛЬНОЙ ЛАВЕ ПРИ ИСПОЛЬЗОВАНИИ СТРУЙНОГО ВЕНТИЛЯТОРА НА ОЧИСТНОМ КОМБАЙНЕ
Authors: ПАВЛОВ С.А. 
Published: October 2024

Приведены результаты исследования влияния работы струйного вентилятора, установленного на очистном комбайне, на изменение параметров аэродинамического сопротивления выемочного участка, концентрации метана и угольной пыли. Исследования проводились в программном комплексе Ansys Fluent, на основании натурных данных, полученных в угольных шахтах Кузбасса. Объектом исследования служила пылегазовоздушная атмосфера сверхдлинных угольных лав протяженностью 400 м с мощностью вынимаемого пласта 2.4 и 3.7 м. Выявлено, что применение струйного вентилятора способно снизить аэродинамическое сопротивление выемочного участка до 35 %, что позволяет увеличить на 24 % количество подаваемого в лаву воздуха без увеличения мощности на главных вентиляционных установках. Поток воздуха, исходящий из струйного вентилятора, способствует устранению застойных метановоздушных зон вблизи работающего комбайна и снижает концентрацию угольной пыли на рабочих местах машинистов на 13.8 - 36.7 %.
The articles describes the studies of influence exerted by operation of a jet fan installed on a shearer on air drag and on methane and coal dust concentrations in a longwall. The investigation used ANSYS Fluent and field data from coal mines in Kuzbass. The object of study was dust and gas/air mixtures in extra-long panels with a length of 400 m and at mineable coal seam thickness of 2.4 and 3.7 m. It is found that jet fans can decrease air drag in such longwalls by 35%, which enables decreasing the air feed in the longwall by 24% without increasing the main fan capacity. The air flow generated by a jet fan eliminates dead methane-air zones nearby an operating shearer and decreases coal dust concentration at work places of shearer’s operators by 13.8-36.7%.