bluuebunny/crossref_metadata_2025 huggingface dataset:
Optimal global second-order regularity and improved integrability for parabolic equations with variable growth
Authors: Arora Rakesh , Shmarev Sergey
Published: June 2024

We consider the homogeneous Dirichlet problem for the parabolic equation

u

t

−
div

(

∣

∇

u
∣

p

(

x
,
t

)

−
2

∇

u

)

=
f

(

x
,
t

)

+
F

(

x
,
t
,
u
,

∇

u

)

{u}_{t}-{\rm{div}}({| \nabla u| }^{p\left(x,t)-2}\nabla u)=f\left(x,t)+F\left(x,t,u,\nabla u)

in the cylinder

Q

T

≔
Ω
×

(

0
,
T

)

{Q}_{T}:= \Omega \times \left(0,T)

, where

Ω
⊂

R

N

\Omega \subset {{\mathbb{R}}}^{N}

,

N
≥
2

N\ge 2

, is a

C

2

{C}^{2}

-smooth or convex bounded domain. It is assumed that

p
∈

C

0
,
1

(

Q

¯

T

)

p\in {C}^{0,1}\left({\overline{Q}}_{T})

is a given function and that the nonlinear source

F

(

x
,
t
,
s
,
ξ

)

F\left(x,t,s,\xi )

has a proper power growth with respect to

s

s

and

ξ

\xi

. It is shown that if

p

(

x
,
t

)

>

2

(

N
+
1

)

N
+
2

p\left(x,t)\gt \frac{2\left(N+1)}{N+2}

,

f
∈

L

2

(

Q

T

)

f\in {L}^{2}\left({Q}_{T})

,

∣

∇

u

0

∣

p

(

x
,
0

)

∈

L

1

(

Ω

)

{| \nabla {u}_{0}| }^{p\left(x,0)}\in {L}^{1}\left(\Omega )

, then the problem has a solution

u
∈

C

0

(

[

0
,
T

]

;

L

2

(

Ω

)

)

u\in {C}^{0}\left(\left[0,T];\hspace{0.33em}{L}^{2}\left(\Omega ))

with

∣

∇

u
∣

p

(

x
,
t

)

∈

L

∞

(

0
,
T
;

L

1

(

Ω

)

)

{| \nabla u| }^{p\left(x,t)}\in {L}^{\infty }\left(0,T;\hspace{0.33em}{L}^{1}\left(\Omega ))

,

u

t

∈

L

2

(

Q

T

)

{u}_{t}\in {L}^{2}\left({Q}_{T})

, obtained as the limit of solutions to the regularized problems in the parabolic Hölder space. The solution possesses the following global regularity properties:

∣

∇

u
∣

2

(

p

(

x
,
t

)

−
1

)

+
r

∈

L

1

(

Q

T

)

,

for any 
0
<
r
<

4

N
+
2

,

∣

∇

u
∣

p

(

x
,
t

)

−
2

∇

u
∈

L

2

(

0
,
T
;

W

1
,
2

(

Ω

)

)

N

.

{| \nabla u| }^{2\left(p\left(x,t)-1)+r}\in {L}^{1}\left({Q}_{T}),\hspace{1.0em}\hspace{0.1em}\text{for any\hspace{0.5em}}0\lt r\lt \frac{4}{N+2}\text{}\hspace{0.1em},\hspace{1.0em}{| \nabla u| }^{p\left(x,t)-2}\nabla u\in {L}^{2}{\left(0,T;{W}^{1,2}\left(\Omega ))}^{N}.
Prescriptive analytics for low and high water management in German waterways
Authors: Brum Marianne , Meißner Dennis , Klein Bastian , Hohenrainer Jochen , Schwanenberg Dirk , Patzke Simone
Published: June 2024

The real-time management of multi-purpose storage reservoirs aims at an efficient operation of existing hydraulic infrastructure. This management process can be structured as a prescriptive analytics setup that considers both current and predicted system states to recommend actions and outline potential implications. In application to a reservoir and river system, it combines hydrological modelling components for the system schematization, observations and data assimilation for the identification of the current system state, meteorological and hydrological predictions as well as optimization-based techniques to support decision-making regarding reservoir operations. In this paper, we present the application of such a framework to the short-term management of the Eder and Diemel storage reservoirs. These reservoirs are operated by the German Federal Waterways and Shipping Administration (WSV) with the primary goal to support navigation in the River Weser during low flow periods. In addition, partially conflicting objectives such as flood protection, energy generation and recreation are considered. The implementation includes an explicit consideration of forecast uncertainty and its impact on the decision-making by using probabilistic forecasts in combination with a multi-stage stochastic optimization approach. We demonstrate the applicability of the approach based on low and high water use cases. Special attention is paid on the benefits of the probabilistic forecast in combination with the multi-stage stochastic optimization versus a deterministic setup. It provides an explicit translation of the forecast uncertainty in the decision variables, in this case the reservoir releases helping the operators to better anticipate the range of future release decisions. Furthermore, the stochastic approach is expected to provide more stable decisions in an operational setting, based on more stable forecasts by considering various possible realizations of the future instead of picking a single one, which gets random after 4–5 days.
Effect of GFRP bar length on the flexural behavior of hybrid concrete beams strengthened with NSM bars
Authors: Al-Katib Haider A. A. , AL-Turaihi Ali A. A.
Published: June 2024

This project aims to investigate the effect of near-surface-mounted glass fiber reinforced polymer (GFRP) bars strengthening on the flexural behavior of hybrid reinforced concrete beams. Seven beams were made; one of these specimens had no strengthening and is considered as a reference beam. The other models were strengthened using near-surface-mounted GFRP bars at the bottom of beams with different lengths (0.5, 0.75, and 1) of effective span beams and diameters (8 and 12 mm) of GFRP bars. The beam length was 2,200 mm with 150 mm width and 240 mm depth. The flexural reinforcement consists of 2 φ12 steel bars at the tension zone and 2 φ12 at the compression zone for all beams. Furthermore, to resist shear forces, φ12 steel bars were used, distributed along the length of the beams spaced at 125 mm c/c; two-point loads on the beams with 500 mm between them were applied at the mid-span. The investigated characteristics were cracking and failure load, crack width, deflection, and failure patterns. By examining the models, it was found that there is an improvement in failure load range from 11.54 to 53.84% relative to the control.
Behavior of container berth structure under the influence of environmental and operational loads
Authors: Jarih Ibtisam Ahmed , Atalla Abdulamir , Galeb Alaa C.
Published: June 2024

Container docks, which are an essential component of the marine berth, are exposed to loads from various sources, such as self-weight, operation, and environment. In this study, four sets of combined loads to which the container berth is exposed were selected at the Um-Qaser Port in southern Iraq. The berth was constructed more than 40 years ago, which has to be verified according to latest specifications, and each set of combined loads was analyzed in three cases. In the first case, the piles were assumed to be fixed at the seabed, and in the second and third cases the piles were modeled as embedded in elastic and elasto-plastic sandy soil, respectively. The general-purpose finite-element software ABAQUS was used to model the various components to determine the maximum stresses, displacements, axial forces, shear forces, and bending moments due to dead, live, operate, berthing, mooring, waves, and seismic loads. It has been demonstrated that the impact loads of ships have a more significant impact on the structure compared to other loads. The calculated displacement when the piles are assumed to be fixed at the seabed level may be reduced by 50–94% of that calculated when the soil is modeled, meaning that assuming fixed piles yields inaccurate results, especially for deck displacements. However, this assumption was verified to yield reasonable results for shear forces at the pile head. It could also be noted that the elasto-plastic model of soil was more sensitive than the elastic model in displacement by 0.4–8% and bending moment by 0.3–34%, while it is less sensitive in axial force by 3–8%. The aim of this study is to obtain knowledge on the behavior and efficiency of container berth under the influence of different loads and the environmental conditions surrounding it.
Scenic communication in specialized communication
Authors: Roelcke Thorsten
Published: June 2024

Scenic communication does not only appear in drama and theater, but also within specialized or professional communication. For this reason, a model of communication in drama and theater is first taken up here, which in turn is based on a simple model of linguistic or specialized communication. Following this, scenic communication in specialized communication is recorded and described using a few more or less prototypical examples. Three types are distinguished, which can be supplemented by further constellation.
Demicompact linear operator. Essential pseudospectra and perturbation
Authors: Ammar Aymen , Daoud Houcem , Jeribi Aref
Published: June 2024

In this paper, we give new results on demicompact linear operators, study some properties and some results on Fredholm and upper semi-Fredholm relations involving demicompact operators. Our results are used to provide a fine description of the essential pseudospectra.
Wave propagation on hexagonal lattices
Authors: Kapanadze David , Pesetskaya Ekaterina
Published: June 2024

We consider propagation of two-dimensional waves on the infinite hexagonal (honeycomb) lattice. Namely, we study the discrete Helmholtz equation in hexagonal lattices without and with a boundary. It is shown that for some configurations these problems can be equivalently reduced to similar problems for the triangular lattice. Based on this fact, new results are obtained for the existence and uniqueness of the solution in the case of the real wave number

k
∈

(
0
,

6

)

∖

{

2

,

3

,
2
}

{k\in(0,\sqrt{6})\setminus\{\sqrt{2},\sqrt{3},2\}}

for the non-homogeneous Helmholtz equation in hexagonal lattices with no boundaries and the real wave number

k
∈

(
0
,

2

)

∪

(
2
,

6

)

{k\in(0,\sqrt{2})\cup(2,\sqrt{6})}

for the exterior Dirichlet problem.
Inverse problems for the eigenparameter Dirac operator with complex weight
Authors: Zhang Ran , Wang Kai , Yang Chuan-Fu
Published: June 2024

Inverse spectral problems are considered for the discontinuous Dirac operator with complex-value weight and the spectral parameter boundary conditions.
We investigate some properties of spectral characteristics and show that the potential can be uniquely determined by the Weyl-type function or by two spectra on the whole interval.
A numerical approach for solving nonlinear fractional Klein–Gordon equation with applications in quantum mechanics
Authors: Srinivasa Kumbinarasaiah , Mulimani Mallanagoud , Adel Waleed
Published: June 2024

In this paper, we propose a numerical approach for solving the nonlinear fractional Klein–Gordon equation (FKGE), a model of significant importance in simulating nonlinear waves in quantum mechanics. Our method combines the Bernoulli wavelet collocation scheme with a functional integration matrix to obtain approximate solutions for the proposed model. Initially, we transform the main problem into a system of algebraic equations, which we solve using the Newton–Raphson method to extract the unknown coefficients and achieve the desired approximate solution. To theoretically validate our method, we conduct a comprehensive convergence analysis, demonstrating its uniform convergence. We perform numerical experiments on various examples with different parameters, presenting the results through tables and figures. Our findings indicate that employing more terms in the utilized techniques enhances accuracy. Furthermore, we compare our approach with existing methods from the literature, showcasing its performance in terms of computational cost, convergence rate, and solution accuracy. These examples illustrate how our techniques yield better approximate solutions for the nonlinear model at a low computational cost, as evidenced by the calculated CPU time and absolute error. Additionally, our method consistently provides better accuracy than other methods from the literature, suggesting its potential for solving more complex problems in physics and other scientific disciplines.
Phase composition and stability of Gd2−x
Th
x
Zr2O7 under extreme conditions
Authors: Svitlyk Volodymyr , Weiss Stephan , Garbarino Gaston , Hübner René , Worbs Andreas , Huittinen Nina , Hennig Christoph
Published: June 2024

Introduction of Th into synthetic disordered fluorite-type Gd2Zr2O7 induces a transition to an ordered pyrochlore-type phase at a Th concentration of 10 % at the Gd site (Gd1.8Th0.2Zr2O7 composition). The degree of order of the fluorite-type phase reaches 50 % for a Th concentration of 25 % (Gd1.5Th0.5Zr2O7 composition). Upon application of high pressure, the Gd2Zr2O7 phase retains the fluorite-type structure until 33 GPa (K
0 = 167(1) GPa), where it undergoes reversible amorphization. The Gd1.7Th0.3Zr2O7 phase was found to be stable up to at least a pressure of 25 GPa (K
0 = 169(3) GPa). Upon heating to T
max of 1135 K, the Gd2Zr2O7 phase retains its disordered fluorite-type structural arrangement (α = 3.03 × 10−5 K−1). The excellent stability of the Gd2−x
Th
x
Zr2O7 phases under extreme conditions of temperature and pressure makes Gd2Zr2O7 a promising candidate as a host matrix for radioactive elements for safe long-term underground storage of nuclear waste.
Between a Rock and a Hard Place: “I Decided to Keep Quiet”: A Qualitative Inquiry Into the Coping Experiences of Young People (15–24) Working at High-Risk Venues for HIV in Uganda
Authors: Babirye Susan , Ssengooba Freddie , Michielsen Kristien
Published: June 2024

Employment linked with social venues has long been described as permissive environments for excessive drinking, disruptive/aggressive behaviors, and overt sexual behaviors, which are known risk factors for HIV. Yet, our understanding of the extent to which workers in such high-risk work settings cope with the various risks therein is still limited. This study explored the coping strategies employed by workers at social venues. We interviewed 47 workers at 22 social venues through small group discussions (15) and in-depth interviews (10) in 2021 in Rakai district, Uganda. All discussions were audiorecorded and transcribed verbatim before analysis. Data were analyzed using thematic content analysis. We found two main categories of coping strategies used by workers: acceptance of sexual risks and keeping safe. Acceptance of risks such as transactional sex was the most used strategy, hence highlighting negative coping. This calls for interventions for improving workers' coping efficiency and adjustment as well as interventions ameliorating the conditions underpinning increased risk of HIV at the venues.
YOĞURDUN UÇUCU BİLEŞEN PROFİLİ VE DUYUSAL ÖZELLİKLERİ ÜZERİNE KÜLTÜR ÇEŞİDİNİN ETKİLERİ
Authors: Elmas Emine Tuğçe , Yuceer Yonca
Published: June 2024

Çalışmada, yoğurt üretiminde farklı kültür çeşitleri kullanımının yoğurdun bazı kimyasal ve duyusal özellikleri ile uçucu bileşenleri üzerine etkisinin belirlenmesi amaçlanmıştır. Bu amaçla altı farklı ticari kültür kullanılmıştır. Yoğurt örneklerinin protein, kül, titrasyon asitliği, laktoz ve tirozin değerlerinin sırasıyla %4.13-4.38, %1.10-1.21, %0.92-1.23, %5.62-6.19 ve 9.57-14.76 mg tirozin/100 g yoğurt arasında değiştiği ortaya konmuştur. Uçucu bileşenlerin belirlenmesi amacıyla katı faz mikroekstraksiyon tekniği ve Gaz Kromatografisi-Kütle Spektrometresi kullanılmıştır. Analiz sonucunda asetaldehit, diasetil, asetoin, asetik asit, bütanoik asit ve hekzanoik asit yoğurtların karakteristik uçucu bileşenleri olarak saptanmıştır. Tanımlayıcı duyusal analizler sonucunda topaklı yapı, kıvam, sünen yapı, fermente ve ekşi terimleri panelistlerce en yoğun algılanan duyusal özellikler olarak belirlenmiştir.
Variation of Nanocellulose Reinforced Recycled Paper: Effect on Tensile Strength
Authors: Hipeni Afkar Rabbani Hidayatullah , Tan Jia Wei , Jasmi Shah Nur Shuhada , Mohd Amin Khairatun Najwa
Published: June 2024

The idea of paper recycling was done due to environmental issue. However, the properties of recycled paper like tensile will decrease each time it is recycled. Addition of reinforcing filler may increase the properties of recycled paper. Thus, in this research, nanocellulose was used as reinforcing filler in recycled paper. The objectives of this research are to fabricate papers from recycled paper and to investigate the effect of different nanocellulose and pressure of compression molding in paper fabrication towards tensile strength of recycled paper. Two types of nanocellulose used were commercialized cellulose nanofiber (CNF) and cellulose nanocrystals (CNC). CNC from filter paper and empty fruit bunches (EFB) were isolated via acid hydrolysis. The recycled paper was fabricated using traditional me. thods (net) and further processed with compression molding. All samples with nanocellulose increase in tensile strength. The tensile strength recorded 114% improvement at 15.28 N/mm2 with 5wt% of CNF.
A Descriptive Study on Perceived Sexual Control in Individuals Who Experience Dating Violence
Authors: Amalia Natasya Putri , Pratiwi Pradipta Christy , Mahanani Fatma Kusuma
Published: June 2024

Efforts to maintain sexual control over a partner occur in various cases of dating violence. This research examines perceived sexual control from the perspectives of internal sexual control, power-other sexual control, and chance-or-luck sexual control. Descriptive quantitative methods were used in this research. A total of 310 respondents filled out the questionnaire online. The questionnaires used are the Revised Conflict Tactics Scale (CTS2) and MSSCQ, adapted from Snell et al. (1993), which are used to measure internal sexual control, power-other sexual control, and chance-or-luck sexual control. Respondents to this study were 310 people (women = 67%, men = 37%), aged 20–30, who had been or were currently in a relationship for at least one year. The selection of respondents used the purposive sampling method. Data analysis uses descriptive techniques. The research results show that perceived sexual control is generally in the high category. Then internal sexual control, power-other sexual control, and chance-or-luck sexual control are also in the high category.
Characteristics of Hybrid Coal from Co-Pyrolysis of Lignite and Corn Cob
Authors: Jefriadi Jefriadi , Oktaviani Mita , Rahmi Lydia , Jelita Rinny
Published: June 2024

Lignite is the lowest rank coal which has less economic value. Corn cobs are solid waste biomass as a by-product of corn processing. The processing of these two materials can produce a product in the form of hybrid coal through the co-pyrolysis process. This study aims to determine the optimum temperature and mixing ratio of co-pyrolysis of lignite and corn cob and to characterize the hybrid coal produced by co-pyrolysis. The lignite is dried and crushed to a particle size of 20-50 mesh. Corn cob was cleaned, cut into pieces, and sieved to a size of 0.4-2 mm. Then it was dried using an oven at 105oC for 24 hours. Lignite and corn cob were mixed with a ratio of 3:1, 1:1, and 1:3 (mass of lignite: mass of corn cob). The mixture of materials is inserted into the pyrolysis reactor as much as 400 grams. The pyrolysis process was carried out at temperatures of 350ºC, 400ºC, 450ºC, 500ºC, and 550ºC for 1 hour by flowing nitrogen gas into the reactor with a flow rate of 1.5 L/minute. The results showed that increasing the mixing ratio and co-pyrolysis temperature would decrease the yield of hybrid coal. Increasing the pyrolysis temperature will increase the calorific value of hybrid coal. Still, the effect of the mixing ratio of lignite and corn cob shows a decrease in heating value at a mixing ratio of 1:1 and an increase in a mixing ratio of 1:3. Other parameters such as moisture content and volatile matter content decreased with increasing temperature and mixing ratio. In contrast, ash content and fixed carbon content increased. So, an optimum temperature and mixing ratio of 450ºC and 1:3 is the best condition to get hybrid coal that met the requirements to be a solid fuel.
Optimization of The Aqueous Enzymatic Extraction (AEE) of Rice Bran Oil With Cellulase Using Response Surface Methodology
Authors: Damayanti Astrilia , Triwibowo Bayu , Megawati Megawati , Ekanuramanta Ahmed Tessario , Harianingsih Harianingsih , Thomas Kevin , Huda Nurul , Nuryoto Nuryoto
Published: June 2024

Rice Bran Oil (RBO) is an oil extracted from rice bran with unsaturated fat content according to World Health Organization (WHO) standards. The enzymatic extraction process of rice bran for oil extraction using cellulase enzymes is considered effective because it is capable of producing oil. Parameters of temperature and incubation time have an influence on the yield of oil produced. So that research is needed regarding the optimum conditions of the enzymatic extraction process including temperature and incubation time on the yield and levels of FFA RBO.Software Design Expert was used in this study to optimize RBO extraction with cellulase using the Response Surface Methodology (RSM) method in the Central Composite Design (CCD) factorial experimental design. The selected independent variables consisted of incubation temperatures, namely 35, 50, and 65 0C and incubation time for 2, 3, and 4 hours. The results show that the RBO yield is 1.7% and the minimum target for FFA levels is 8.4% at a temperature of 51.5 0C with an incubation time of 4 hours. Processing data with Design expert software produces an analysis of ANOVA experimental data. Incubation time has a significant level (p0.05) on RBO yield and incubation temperature has a significant level (p0.05) on RBO FFA.
Effects of Steam-To-Biomass Ratio and Temperature in Gasification on The Methanol Conversion and Selectivity: A Simulation Study of Biomass to Methanol
Authors: Muthia Rahma , Raihan Pratama Muhammad
Published: June 2024

Gasification is an attractive pathway for valorizing waste and biomass as it can deal with a wide range of feedstocks yielding gaseous products that be converted further to valuable biofuels and chemicals. While many previous studies commonly discussed the effects of gasification operating parameters, such as operating conditions, biomass feedstocks and gasifying agents, on syngas compositions, fewer studies evaluated the effects of gasification process parameters on final products derived from syngas. Essentially, performing an integrated assessment of the biomass-to-product conversion gives a thorough understanding of the biomass processing and provides one with useful heuristics for the conversion of biomass to valuable chemicals. This study evaluates the effects of steam-to-biomass ratio (S/B = 0.3 – 0.7) and gasification temperature (Tgasif = 900℃ – 1,100℃) on the methanol production by performing simulations in the Aspen Plus v.11 process simulator. The kinetically controlled reactions model was considered in the methanol synthesis unit to mimic its actual process condition and to take into account the possibility of the side product formation. The outcome of this study recommends that the steam-to-biomass ratio gives more notable effects on the gasification distribution products and the conversion of syngas to methanol than those given by the gasification temperature. While, the reaction selectivity to methanol remains high, and it is not sensitive to the change of steam-to-biomass ratios and gasification temperatures.
Cellulose Isolation and Characterization of Green Seaweed C. Lentillifera from Halmahera, Indonesia
Authors: Mentari Puji Rizana Ayu , Andreansyah Ilham , Amanda Putri , Marlina Resti , Suharti Suharti , Agustina Siti , Syamani Firda Aulya
Published: June 2024

Caulerpa lentillifera or known as sea grapes is a type of green seaweed which is rich of nutritional components and widespread in the tropical regions in Asia, including Indonesia. Moreover, C. lentillifera contains of polysaccharides, such as cellulose which has the potential to various applications. In this study, C. lentillifera collected from Halmahera, Indonesia was determined for its chemical compositions (moisture, ash, extractives, hemicellulose, α-cellulose contents) and was extracted to obtain cellulose. Isolation of cellulose from C. lentillifera was done by soxhlet extracted using ethanol-benzene solvent to remove extractives, boiling to increase the amount of cellulose extracted, H2O2 bleaching to eliminate any remaining pigments and other contaminants, and freeze drying to get coarse powder of cellulose. The moisture content, ash, extractives, hemicellulose, α-cellulose of C. lentillifera were 11.94%, 31.62%, 11.53%, 35.57%, and 7.95%, respectively. The yield of cellulose obtained was 31.13% based on seaweed dry weight. FE-SEM (Field Emission-Scanning Electron Microscopy) analysis of C. lentillifera showed colonies of diatoms in elliptical shapes. FTIR (Fourier Transform Infrared) measurements indicating cellulose purity after extraction process. X-Ray Diffraction (XRD) analysis resulted some peaks of salt crystals in C. lentillifera and cellulose of C. lentillifera in amorphous form. After extraction, the crystallinity index of cellulose obtained was 37.3%.
Iron Impregnation on Activated Carbon Prepared from Tamarind Wood (Tamarindus Indica L.) as a Potential Catalyst in Biodiesel Production
Authors: Astuti Erna , Suharto Totok Eka , Setyawan Martomo , Hanin Nabila , Mulyono Sekar Larasati
Published: June 2024

Renewable energy in the form of biodiesel requires a process called transesterification. This process runs slowly, so a catalyst is needed to reduce the activation energy and speed up the reaction rate. Activated carbon is one of the supports in transesterification catalysts because of its high surface area and is proven to be effective in gas or liquid phase reactions. This work aims to study the potential of active carbon from tamarind wood for making catalysts, the characteristics of the catalyst and the optimal concentration of Fe(NO3)3 in the impregnation step. Activated carbon was impregnated using an Ultrasonic Processor with 80% strength at 60 oC for 60 minutes. The impregnation process was carried out with variations of 2, 4, and 6% Fe(NO3)3 dissolved in 0.09M isopropyl alcohol. Variation of processing time 30, 40, 50, 60, 70, 80 minutes. Furthermore, after the activated carbon is allowed to stand for 24 hours, a calcination process is carried out at 300oC to remove impurities. Obtained materials have been characterized by SEM and XRD. The Fe-impregnation process has been successfully carried out on activated carbon made from Tamarind wood (Tamarindus indica L.). In the Fe precursor solution concentration range of 2 – 6%, the higher the concentration of the Fe precursor solution, the higher the impregnated Fe metal. Fe-impregnated activated carbon has the characteristics of being a material consisting of a mixture of crystalline and amorphous phases with even porous surface morphology. This Fe-impregnated activated carbon is a potential material as a catalyst in the biodiesel production process.
Revisiting the environmental Kuznets curve hypothesis in the context of renewable and non-renewable energy in China
Authors: Zaland Zikrullah , İmamoğlu Hatice
Published: June 2024

This research paper attempts to determine the effect of fossil fuel, renewable energy, and economic growth on carbon dioxide emissions and revisits China's Environmental Kuznets curve (EKC) hypothesis. The time series analysis will be performed for the years 1990 to 2020. To begin, Augmented Dickey-Fuller (ADF) and Phillips Perron (PP) tests will be performed to verify the series' stationarity. Second, the cointegration test will be utilized to determine the validity of a cointegration vector before performing the Fully Modified Least Square approach to conduct long- and short-term estimation. The empirical analysis illustrates that renewable energy negatively and significantly affects short- and long-run carbon dioxide emissions. However, fossil fuel consumption only positively and significantly affects carbon dioxide emissions in the short run. The empirical evidence supports the Environment Kuznets Curve's hypothesis in China. Fossil fuel consumption has a considerably higher effect on carbon dioxide emissions than renewable energy. To avoid ecological damage in China, authorities must pay more consideration to encouraging the use of energy from renewable sources. This demonstrates that China's overall environmental performance first deteriorates before gradually improving with economic growth.
The relationship between the Istanbul Stock Market and Türkiye’s foreign trade
Authors: Aytüre Selma , Keskin Meltem
Published: June 2024

International trade is a significant indicator determining all countries' competitiveness and welfare levels, whether developed or developing. Stock markets are indicators of capital markets and economies. In this context, it may be significant to determine the relationship levels of international trade and the stock market. Purpose of the study: To examine the relationship and level between international trade potential in Türkiye and the BIST 100 Index (XU100) in the period 2013:01-2023:12. For this purpose, the reflection of Türkiye's exports and imports on BIST 100 was evaluated using Johansen Cointegral and Granger Causality Analysis methods. According to the findings, it has been determined that exports and imports are related to BIST 100 performance in the short and long term and cause BIST 100 performance. Exports positively affect BIST 100 performance in the short and long term, while imports negatively affect BIST 100 performance in the short and long term.
A field research on Accommodation Tax
Authors: Öztürk Dilan , Saygın Özgür
Published: June 2024

Law No. 7194, Digital Service Tax and Certain Laws and Law No. 375 on the Turkish Tax System With the Law on the Amendment of the Decree Law, a new tax calculated on the cost of accommodation services was introduced. The impact of the Accommodation Tax, which has been in practice for a short period, on citizens is essential.  On 01.01.2023, 1,020 people were surveyed to obtain their opinions on the Accommodation Tax that was put into effect. It is seen that some of the demographic and preferential characteristics of the respondents in terms of gender, age, marital status, educational status, occupational status, number of annual vacations, accommodation preferences and income status differ significantly within themselves. In contrast, their opinions on the Accommodation Tax do not differ in some variables.
L-Carnitine sustainably affects bioenergetic profile of bovine blastocysts and transcriptome profile of elongation-stage embryos
Authors: Held-Hoelker Eva , Kurzella Jessica , Salilew-Wondim Dessie , Rings Franca , Tesfaye Dawit , Tholen Ernst , Grosse-Brinkhaus Christine , Hoelker Michael
Published: June 2024

In brief

In the present study the sustainable effect of L-carnitine during the culture period on the post-transfer development was investigated. Taken together, we uncovered direct effects of L-carnitine on the bioenergetic profile of day 7 blastocysts along with sustainable effects on mtDNA copy numbers and transcriptome profile of bovine day 14 embryos.

L-Carnitine (LC) is known to play key roles in lipid metabolism and antioxidative activity, implicating enhanced cryotolerance of bovine blastocysts. However, sustainability of LC supplementation during culture period on preimplantation development beyond the blastocyst stage has not been investigated so far. Therefore, all embryos were cultured under fatty acid-free conditions, one group with LC (LC embryos) and the control group without LC (control) supplementation. Transfer to recipients was conducted on day 6. Elongation-stage embryos were recovered on day 14; metrics of embryo recollection, developmental rates as regards early elongation-stage as well as mean embryo length did not differ between the groups. Gene expression analyses via NGS revealed 341 genes to be differentially regulated between elongation-stage embryos derived from LC supplementation compared to controls. These played mainly a role in molecular functions and biological processes like oxidoreductase activity, ATP-dependent activity, cellular stress, and respiration. Pathways like oxidative phosphorylation and thermogenesis, extracellular matrix receptor signaling, PI3K-Akt, and focal adhesion were affected by differentially regulated genes. Moreover, all DEGs located on the mitochondria were significantly downregulated in LC embryos, being in line with lower mitochondrial copy number and mtDNA integrity compared to the control group. Finally, we uncovered alterations of the bioenergetic profile on day 7 as a consequence of LC supplementation for the first time, revealing significantly higher oxygen consumption rates, ATP linked respiration and spare capacity for LC embryos. In summary, we uncovered direct effects of LC supplementation during the culture period on the bioenergetic profile along with sustainable effects on mtDNA copy numbers and transcriptome profile of bovine day 14 embryos.
To Cover or to Hide? The Role of the Media in the Trials of the Nazis and Their Collaborators
Authors: Vaiseta Tomas
Published: June 2024

Rec.: Ruth Leiserowitz, Gintarė Malinauskaitė, Hektoras Vitkus (eds.), Making Justice Visible: War Crimes Trials, Media and Memory after World War II, Osnabrück: fibre Verlag, 2022.
Large deviations for stochastic predator–prey model with Lévy noise
Authors: Sridevi C.S. , Suvinthra Murugan , Balachandran Krishnan
Published: June 2024

This paper discusses the large deviations for stochastic predator–prey model driven by multiplicative Lévy noise. Using Galerkin approximation, we initially prove the existence and uniqueness of solution. Due to the equivalence between Laplace principle and large deviation principle under a Polish space, the method of weak convergence has been followed in order to establish our results for this coupled system of equations.
Hysteresis and bistability in synaptic transmission modeled as a chain of biochemical reactions with a positive feedback
Authors: Katauskis Pranas , Ivanauskas Feliksas , Alaburda Aidas
Published: June 2024

In this paper, we employ computational analysis to investigate the long-term potentiation (LTP) and memory formation in synapses between neurons. We use a mathematical model describing the synaptic transmission as a signal transduction pathway with a positive feedback loop formed by diffusion of nitric oxide (NO) to the presynaptic site. We found that the model of synaptic transmission exhibits a hysteresis-like behavior, where the strength of synaptic transmission depends not just on instantaneous interstimulus intervals, but also on the history of activity. The switching between resting and memory states can be induced by physiologically relevant and moderate (less than 50%) changes in the duration of interstimulus intervals.
Avifauna of an exploratory oil drilling area in a previously deforested amazonian landscape
Authors: Chica Esteban Carrillo- , Delgado Herrera María Alejandra
Published: June 2024

Oil exploration and exploitation activities have negative effects on biodiversity. This is mainly due to secondary causes such as increased colonization following the opening of new roads. However, little is known about the effects that oil industry may have on previously deforested landscapes. In this study, we characterized the avifauna of an exploratory oil drilling area in the Colombian Amazon, where the landscape is dominated by pastures and monoculture crops with some patches of scattered secondary forests. The avifauna was typical of intervened Amazonian landscapes in which most specialist forest birds are absent. The few that were present were recorded in only one or a small number of the study localities, despite the fact that the same habitats were found in practically all of them. The absence of these species and the isolation of the few remaining ones is due to processes prior to the implementation of oil activity. In this sense, the construction of new infrastructure and the adaptation of the existing one will not imply a significant reduction of the remaining forest areas which, according to current regulations, must be protected. Conversely, if the forest offsetting process required for oil exploration and exploitation is well directed, this could result in an increase in the connectivity of the remaining forest fragments, favoring species mobility and a possible increase in diversity.
Kónstantinos Akropolités levele a Timariónról
Authors: Mészáros Tamás
Published: June 2024

A XI–XII. századi, ismeretlen szerzőtől származó Timarión című szatíra főhőse egy utazás során tetszhalott állapotba kerül, két démon erőszakkal az alvilágba kényszeríti, ahol egy bírósági tárgyaláson bebizonyítja, hogy még nem halt meg, úgyhogy visszatérhet az élők közé. Jelen tanulmány célja, hogy bemutassa és értelmezze Kónstantinos Akropolités kétszáz évvel később keletkezett rövid levelét, melyben a szerző éles kritika tárgyává teszi a Timariónt, anélkül hogy kifogásait pontosan kifejtené.
A budapesti nemzetközi bizantinológiai kongresszus története
Authors: Juhász Erika
Published: June 2024

Három évtizeddel azután, hogy Karl Krumbacher megszervezte a Müncheni Egyetemen az első bizantinológiai intézetet, a tudományos eredmények bemutatására nemzetközi bizantinológiai kongresszust hívtak össze. A kezdetben politikai okokból szűk körre korlátozódó rendezvény fokozatosan megnyílt minden nemzet számára, miközben a bizantinológiai kutatásban az egyes országok saját törekvései mellett egyre nagyobb szerepet kaptak a nemzetközi együttműködések és a tudományos eszme cserék. A magyar kutatók aktívan részt vettek ezekben a folyamatokban, és magas szintű tudományos munkájuk mellett kulturális-diplomáciai erőfeszítéseikkel is igyekeztek Magyarországot integrálni a globális tudományos diskurzusba. Törekvéseiknek köszönhetően Budapest elnyerte a bizantinológia legrangosabb nemzetközi kongresszusának rendezési jogát, de a kényszerítő külső körülmények miatt a rendezvény végül nem kerülhetett megrendezésre. A tanulmány az eredeti terveket és koncepcionális kereteket követi nyomon a korabeli dokumentumokon keresztül.
Digital Reconstructions of Wounded Memories in Kosovo
Authors: Federici Angelica , Omenetto Silvia
Published: June 2024

Between 1998 and 2004 numerous religious and cultural sites—Serbian Orthodox and Islamic— in Kosovo were systematically vandalised, damaged or destroyed. The annihilation of these historical-religious architectures highlighted the strategic significance of cultural heritage as a political tool. Two decades later we know the extent of the losses thanks to the documentation collected by UNESCO, the UN and the OSCE. We also have a new methodology that incorporates digital technologies such as 3D modelling, artificial intelligence, machine learning, cloud computing, data technology, geographic information systems and virtual reality/AR, which we could draw on for safeguarding this religious heritage. In this article we wish to present a project proposal which, using some of the Digital Humanities (DH) methodologies applied in the field of religious studies (and in peace and conflict studies), can guarantee the accessibility and long-term diffusion of these sites and cultural content at risk.
A preliminary investigation of occurrence of pharmaceuticals and personal care products in total suspended particulate matter in Ha Noi, Viet Nam
Authors: Hai Doan Nguyen , Kadokami Kiwao , Le Minh Vu , Duong Hanh Thi
Published: June 2024

Air pollution has become a serious environmental issue in Viet Nam, particularly in large cities. There is little information regarding the presence of pharmaceuticals and personal care products (PPCPs) in suspended particulate matter in Ha Noi, Viet Nam. The present study screened 163 PPCPs from 12 total suspended particulate matter (TSP) samples collected in Ha Noi using a novel analytical method, the liquid chromatography-mass spectrometry-quadrupole time of flight-Sequential Window Acquisition of All Theoretical Fragment Ion Spectra method (LC-QTOF-MS-SWATH). We identified and quantified 6 of the 163 PPCPs. All of the 6 PPCPs were detected for the first time in TSP. The total concentration ranged from 37.3 to 401.0 pg m-3 (median: 143 pg m-3). The number of PPCPs detected per sample ranged from 1 to 5 (median: 3), and their figure found was higher in the nighttime than that of the daytime.
Effect of heat treatment on corrosion resistance of Al2O3-TiO2 ceramic coating impregnated with aluminum phosphate
Authors: Nguyen Van Tuan , Nguyen Tuan Anh , Pham Thi Ha , Pham Thi Ly , Nguyen Thi Phuong , Le Thu Quy
Published: June 2024

The atmospheric plasma spray process (APS) is a well-established and widely employed technology used to create various types of coating for the fabrication of numerous industrial applications. Speciallity, this process is considered as a suitable technique for fabricating ceramic coatings. However, the structure of thermal spray coatings consists of particles, semi-molten particles, oxides, pores, and cracks that signiﬁcantly inﬂuence the coating properties, especially their erosion-corrosion resistance. In this study, the Al2O3-40TiO2 coating applied by APS was penetrated with aluminum phosphate (APP) by ultrasonic excitation method, and then, the effect of heat treatment after the sealing on corrosion protection of Al2O3-40TiO2 ceramic coating was investigated. The results show that, after being impregnated with APP, the heat treatment at 800 oC assures the coating a lower porosity and better corrosion resistance than heat treatments at 400 and 600 oC. The existence of the durable crystalline phases Al(PO3)3 (Cubic), Al2P6O18 (Monoclinic), and AlPO4 (Orthorhombic) on the surface of the sample heat-treated at 800 oC has contributed to enhancing the corrosion resistance of the Al2O3-40TiO2 coating.
Waste solar panel generation in Viet Nam: waste estimation and management orientation
Authors: Phuong Ha Tran , Vinh Hung Ha , Duc Quang Nguyen , Minh Trang Vu , Duy Nam Dao , Phuong Anh Dinh Le , Thi Thu Huyen Nguyen , Trung Hai Huynh
Published: June 2024

Solar energy has emerged as a prominent solution to address the rising energy needs of expanding populations and combat climate change. While the advancement and proliferation of solar photovoltaics have significantly contributed to the decarbonization of energy systems, the improper disposal of end-of-life solar panels could potentially result in significant environmental impacts. Moreover, lack of or inadequate information on the quantity of the obsolete solar panels and their related environmental impacts, as well as proper incentives, and regulatory policies on waste solar panel management are major hinderances for the safe disposal of waste solar panels their materials. In this case study, surveys at solar panel manufacturers, solar power plants and rooftop solar systems have been conducted. The collected information and data are then used to derive solar panel’s lifespan and estimate the amount of waste solar panel till 2050. It is estimated that the cumulative amount of waste solar panel generated in 2022 is about 148 thousand tonnes and is projected to increase to 1.7 million tonnes by 2050. Based on that, sound management solutions toward circular economy have been proposed to properly manage waste solar panel in Vietnam.
Effect of Implant Maintenance on Incidence of Peri-implantitis and Early Implant Failure: Retrospective Cohort Study
Authors: Golob Deeb Janina , Ha Michael , Carrico Caroline K. , Waldrop Thomas , Lee Pandora K.
Published: June 2024

Maintaining dental implants and managing peri-implant tissues has become integral to dental practice. Owing to the larger number of implants placed, the number of peri-implant lesions is increasing. Periodontal implant maintenance therapy (PIMT) provides a conservative long-term treatment modality to monitor and maintain implants. This study aims to investigate periodontal maintenance effects on peri-implant tissue health to add to existing evidence. A retrospective analysis included implant patients with 1–7 years of follow-up, assessing peri-implantitis and early implant failure as outcome variables. The frequency of PIMT, implant characteristics, and demographics served as predictors, and associations between peri-implantitis, implant failure, and PIMT frequency were analyzed using Fisher exact tests with the significance level set at .05. Data were collected on 501 implants from 185 patients. Twenty-nine (6%) demonstrated peri-implantitis, whereas 22 (5%) experienced early implant failure. A significant association between PIMT and peri-implantitis was observed (p-value = .0169) with the rate of peri-implantitis at 9% (n = 20) for patients without PIMT and only 4% (n = 10) for those with PIMT. Whereas PIMT was not significantly associated with early implant failure (p-value = .4372), peri-implantitis was: 25% of implants with peri-implantitis experienced early failure compared with 4% without (p-value = .0062). Considering the limitations of the present study, the absence of PIMT was found to be associated with peri-implantitis, which was itself associated with early implant failure. Implant maintenance at 6-month intervals is important in maintaining peri-implant health.
ПРИБУТОК ГОСПОДАРСТВА У ТОНКОЩАХ ГОДІВЛІ
Authors: Makarynska A.
Published: June 2024

5-16 листопада 2023 року у м. Хмельницький пройшов науково-практичний семінар «ПРИБУТОК ГОСПОДАРСТВА У ТОНКОЩАХ ГОДІВЛІ».Організатором семінару виступило ТОВ «Сій Добро», яке представляє європейські продукти на ринку України для розвитку, інтеграції та вдосконалення аграрного сектору.
REDUCTION OF MUTUAL COUPLING IN MIMO ANTENNA FOR BLUETOOTH/WIMAX/ WLAN APPLICATIONS
Authors: Suneetha Pasumarthi , Naik Kethavathu Srinivasa , Muthusamy Pachiyaannan
Published: June 2024

This paper proposes a triband defective ground structure (DGS)-based MIMO antenna for 2.4 GHz Bluetooth, 3.5 GHz worldwide interoperability for microwave access (WiMAX), and 5.2 GHz wireless local networks (WLAN) applications. A half-rectangle microstrip patch antenna cut with an asymmetric
feed line is used in the proposed MIMO design. Isolation is improved by 7 dB, and gain is increased by 2 dB when inner and outer ring circles are used as a DGS structure. The proposed antenna acquired a diversity gain (DG) of 9.94 dB and an envelope correlation coefficient (ECC) of 0.01 magnitudes. Moreover, this MIMO antenna covers bandwidths of 2.3 GHz-2.5 GHz, 3.4 GHz-3.8 GHz, and 5.2 GHz-5.8 GHz. The antenna's overall dimensions are 60 mm x 50 mm x 1.6 mm. The proposed antenna was designed, simulated, and measured using CSTMW studio, Schwarz ZVL vector network analyzer, and tested in an anechoic chamber.
OPTIMIZATION OF ENERGY EFFICIENCY IN MULTI-CHANNEL CO-OPERATIVE SPECTRUM SENSING IN COGNITIVE RADIO NETWORKS
Authors: Palli Ramya
Published: June 2024

In this paper, the focus is on energy efficiency in cooperative spectrum sensing in cognitive radio networks by considering multiple channels in a slotted time scenario. The sensing time consists of mini slots. A secondary user uses a mini-slot to sense a channel. Considering multiple channels, throughput, energy consumption, and, finally, energy efficiency are calculated. Additionally, the optimal number of mini-slots are obtained regarding throughput and energy efficiency using the particle swarm optimization algorithm. Simulation results are presented for the algorithms considered in this paper.