bluuebunny/crossref_metadata_2025 huggingface dataset:
Bibliometric Analysis Commind Relax Support on Anxiety Among Pre Operative Patients
Authors: Setiaprabhawa Farenzi Budi , Pranata Satriya , Samiasih Amin
Published: August 2023

Background: Intervention in the management of anxiety is an approach that is currently being developed by researchers in various countries. This research needs the latest information and trends for future research topics related to cognitive behavior therapy interventions, mindfulness, relax, and support for anxiety in preoperative patients.

Purpose: The purpose of this study was to determine the mapping of network visualization, overlay visualization, and density visualization using the VOSviewer application on the topic of the influence of cognitive behavior therapy, mindfulness, relax, and support (commind relax support) on the anxiety of preoperative patients.

Methods: Data analysis used bibliometrics in this study. Search data using the web via http://app.dimensions.ai. Journals or data are limited from 2017-2023, which focus on the fields of health sciences, nursing, clinical sciences, public health, and types of publications are articles. The data is analyzed to become a bibliometric map using VOSviewer.

Results: The results of data identification through dimensions.ai contained 24,099 data recorded, by sorting based on the type of article and type of document the results found were 645 articles. The peak of publications on cognitive behavior therapy, mindfulness, relax, and support for preoperative anxiety occurred in 2020 and the lowest was in 2023. Research on cognitive behavior therapy, mindfulness, relax, and support for preoperative anxiety is not only carried out in the health sector , medicine, nursing, and psychology but are found in other fields as well.

Conclusion: The topic of preoperative anxiety management interventions is a topic that needs to be further developed in various countries, especially in developing countries. Suggestions for other researchers, choose a topic that is included in low visualization to find research updates.
Drug utilization research at the individual level as the main concept of pharmacoepidemiology
Authors: Mukhina S. M. , Baranova M. I. , Gomon Yu. M.
Published: August 2023

Pharmacoepidemiological  studies  are  necessary  to  improve  the  system  of  rational  use  of  drugs  and  to  identify  the  most problematic areas. Such studies make it possible to evaluate not only quantitative indicators of consumption but also indicators such as patient adherence, frequency of cases of polypharmacy, and drug abuse.
Potensi limbah kulit dan biji rambutan (Nephelium lappaceum L) sebagai bioetanol
Authors: Hutagalung Johannes Martua , Murdikaningrum Galu , Yulianti Melinda , Nurcahyani Shinta
Published: August 2023

In view of information on rambutan creation which is expanding, the misuse of rambutan strips and seeds is likewise expanding. Remembering that rambutan strips and seeds contain a few mixtures that can be utilized as elective unrefined components in the production of bioethanol. This study aims to determine the effect of variations in the addition of yeast on the yield and content of bioethanol, and also to determine the maximum mass of the addition of yeast to acquire the biggest yield and ethanol content. This research went through 5 stages, first stage is the readiness of the skin and seeds of rambutan, second stage is α-cellulose detachment, third step is hydrolysis with 1% HCl to create glucose which will be analyzed using Benedict's reagent and the Luff-Schoorl method. Qualitative analysis showed positive results and glucose levels obtained were 22.39% with a glucose yield of 1.50%. The fourth stage is glucose fermentation by using five days with variations in yeast weight of 5, 6 and 7 grams. The fifth step is to separate the resulting bioethanol by distillation and determine alcohol content using an alcohol refractometer. Yield bioethanol obtained by varying the weight of yeast 5, 6, and 7 grams respectively was 1.05%, 1.18%, and 1.67% with the levels of bioethanol obtained 1.95%, 2.15%, and 3.00%. The highest yield and content of bioethanol were obtained by adding 7 grams of yeast. The yield obtained on this bioethanol is 1.67% and the bioethanol content is 3.00%.

Keywords: bioethanol, cellulose, fermentation, hydrolysis, rambutan peels.
Cardiorresonancia magnética 4D Flow e insuficiencia de las válvulas semilunares: Destinados a ayudarse
Authors: Urmeneta Ulloa Javier , Cabrera José Ángel , Martínez de Vega Vicente
Published: August 2023

La cardiorresonancia magnética 4D-Flow permite la valoración de flujos en las tres dimensiones del espacio dentro del volumen tridimensional adquirido. Es factible la evaluación cuali-cuantitativa de las insuficiencias semilunares. Se muestra la utilidad de esta tecnología en pacientes con regurgitación aórtica y pulmonar.
Reparación percutánea borde a borde de la insuficiencia mitral aguda por rotura de músculo papilar en el contexto de infarto agudo de miocardio
Authors: Azzam Ismail Khalil , Marcos-Alberca Moreno Pedro , Nombela Franco Luis , Bourdin Juan Pedro
Published: August 2023

La insuficiencia mitral aguda por rotura de músculo papilar es una complicación mecánica poco frecuente pero con una mortalidad alta en el contexto del infarto agudo de miocardio. Habitualmente se presenta con deterioro hemodinámico rápido con edema pulmonar y shock cardiogénico. La reparación quirúrgica o la sustitución valvular son consideradas la primera línea de tratamiento, sin embargo muchos de estos pacientes se presenta con un riesgo quirúrgico prohibitivo. Presentamos el caso de reparación exitosa borde a borde de insuficiencia mitral aguda severa por rotura de músculo papilar en el contexto de infarto agudo de miocardio, logrando estabilizar hemodinámicamente a paciente en shock cardiogénico de muy alto riesgo quirúrgico, demostrando el valor de esta técnica percutánea y el papel de la ecocardiografía transesofágica en el diagnóstico, manejo y seguimiento de estos pacientes.
Gender Differences of Smoking Stigma on Gender and Smoking Self-identification in Korean Smokers
Authors:   The Korean Data Analysis Society, Ha Seunghyuk , Lee Jang-Han
Published: August 2023

This research aimed to investigate the gender difference in Korean smokers’ smoking stigma and the degree of self-identification of their smoking status. Two Implicit Association Tests (IATs) were conducted to provide empirical evidence and compare the smoking stigma and self-identification of male and female smokers. Smoking stigma was measured to evaluate the attitude on smokers’ own gender and the self-identification as a smoker was measured as a perception of their smoking status as a stigmatized feature. As a result, it was found that Korean female smokers tended to attribute smokers with the same gender less favorably than male smokers and identify themselves as smokers more than males do. Additional correlation analysis on each subgroup found that the public stigma of Korean female smokers was correlated to their smoking self-identification, unlike male smokers, suggesting that female smokers were more vulnerable to higher smoking stigma by recognizing their self-identity as a smoker. In accordance with the model of stigma-induced identity threat, the result showed that gender differences in smokers’ stigma might be a risk factor in some cultural contexts which warrants further research in substance dependence.
Analyzing Nonlinear Income Persistence of the Elderly
Authors:   The Korean Data Analysis Society, Hwang Sun Ho
Published: August 2023

This study estimates income risk observed among the elderly using the Korean Retirement and Income Study data. In order to decompose household income into permanent and transitory components, the quantile-based panel data framework is employed. The permanent component is assumed to follow a first-order Markov process, and the transitory component is assumed to be independent over time and also independent of the persistent components. I estimate the income persistence from the estimated permanent income component, and analyze the dynamic effects of permanent income shocks on income through simulations. The results show the presence of nonlinear persistence in the household income of the elderly. Furthermore, it is observed that the dynamic effects of permanent income shocks vary depending on the past income history. These findings differ from studies focused on the age groups participating in the labor market. In particular, the permanent income shocks have a significant impact on the income of elderly households. In particular, the permanent income shocks have a significant impact on the income of elderly households.
Reduction of Machine Breakdown in the Brewery Manufacturing Company, A Case Study of Brewery “A” in the Eastern Nigeria
Authors: C.E. Onyema , O.O. Obiukwu , G.O. Osueke
Published: August 2023

In this study, the machine break down pattern in Brewery “A” in Eastern Nigeria situated in Onitsha Anambra state has been considered. In the first step of this study, structured questionnaires were produced and administered to target audience for primary data collection. The brewery has limited newsletters, annual reports and bulletins that were used in addition for the reviews. The machines used in the packaging department and its breakdown data over a period of twelve months were gathered and from this, the frequency of breakdown of the machines were established and the data analyzed. The analysis was done by evaluating bottleneck machine breakdowns for different work stations in the production plant, and the effects of breakdown on system output. As a result of the study, critical rates of machine breakdown, which have affected system output, were determined. The frequency of machine breakdown, downtime and maintenance failure problems were also identified. Data collected were analyzed and model for optimization developed. Root cause analysis tools–fishbone and “5why” were used to eliminate the frequent occurring machine breakdown. Mean Time to Failure (MTBF), Availability, and Mean Time to Repair (MTTR) values for the various production lines were evaluated before and after root cause analysis. The result shows that a percentage increase of 13.66%, 10.62% and decrease of 46.42% respectively were obtained which indicated improved Factory efficiency, machine availability and compliancy to plan. Also, Exponential distribution model was used to calculate the failure rate and reliability of the machines using the reliability measures result obtained after root cause analysis technique was applied to each failure. A reliability of 99.7% was obtained.
Scaling of Magnetic Reconnection Electron Bulk Heating in the High-Alfvén-speed and Low-β Regime of Earth’s Magnetotail
Authors: Øieroset M. , Phan T. D. , Oka M. , Drake J. F. , Fuselier S. A. , Gershman D. J. , Maheshwari K. , Giles B. L. , Zhang Q. , Guo F. , Burch J. L. , Torbert R. B. , Strangeway R. J.
Published: August 2023

We have surveyed 21 reconnection exhaust events observed by Magnetospheric MultiScale in the low-plasma-β and high-Alfvén-speed regime of the Earth’s magnetotail to investigate the scaling of electron bulk heating produced by reconnection. The ranges of inflow Alfvén speed and inflow electron β
e covered by this study are 800–4000 km s−1 and 0.001–0.1, respectively, and the observed heating ranges from a few hundred electronvolts to several kiloelectronvolts. We find that the temperature change in the reconnection exhaust relative to the inflow, ΔT
e, is correlated with the inflow Alfvén speed, V
Ax,in, based on the reconnecting magnetic field and the inflow plasma density. Furthermore, ΔT
e is linearly proportional to the inflowing magnetic energy per particle,

m

i

V

Ax
,
in

2

, and the best fit to the data produces the empirical relation ΔT
e = 0.020

m

i

V

Ax
,
in

2

, i.e., the electron temperature increase is on average ∼2% of the inflowing magnetic energy per particle. This magnetotail study extends a previous magnetopause reconnection study by two orders of magnitude in both magnetic energy and electron β, to a regime that is comparable to the solar corona. The validity of the empirical relation over such a large combined magnetopause–magnetotail plasma parameter range of V
A ∼ 10–4000 km s−1 and β
e ∼ 0.001–10 suggests that one can predict the magnitude of the bulk electron heating by reconnection in a variety of contexts from the simple knowledge of a single parameter: the Alfvén speed of the ambient plasma.
Energy Budget in the Solar Corona
Authors: Telloni Daniele , Romoli Marco , Velli Marco , Zank Gary P. , Adhikari Laxman , Zhao Lingling , Downs Cooper , Halekas Jasper S. , Verniero Jaye L. , McManus Michael D. , Shi Chen , Burtovoi Aleksandr , Susino Roberto , Spadaro Daniele , Liberatore Alessandro , Antonucci Ester , De Leo Yara , Abbo Lucia , Frassati Federica , Jerse Giovanna , Landini Federico , Nicolini Gianalfredo , Pancrazzi Maurizio , Russano Giuliana , Sasso Clementina , Andretta Vincenzo , Da Deppo Vania , Fineschi Silvano , Grimani Catia , Heinzel Petr , Moses John D. , Naletto Giampiero , Stangalini Marco , Teriaca Luca , Uslenghi Michela , Bale Stuart D. , Kasper Justin C.
Published: August 2023

This paper addresses the first direct investigation of the energy budget in the solar corona. Exploiting joint observations of the same coronal plasma by Parker Solar Probe and the Metis coronagraph aboard Solar Orbiter and the conserved equations for mass, magnetic flux, and wave action, we estimate the values of all terms comprising the total energy flux of the proton component of the slow solar wind from 6.3 to 13.3 R
⊙. For distances from the Sun to less than 7 R
⊙, we find that the primary source of solar wind energy is magnetic fluctuations including Alfvén waves. As the plasma flows away from the low corona, magnetic energy is gradually converted into kinetic energy, which dominates the total energy flux at heights above 7 R
⊙. It is found too that the electric potential energy flux plays an important role in accelerating the solar wind only at altitudes below 6 R
⊙, while enthalpy and heat fluxes only become important at even lower heights. The results finally show that energy equipartition does not exist in the solar corona.
The Chandra Source Catalog Normal Galaxy Sample
Authors: Kim Dong-Woo , Cassity Alyssa , Bhatt Binod , Fabbiano Giuseppina , Martinez Galarza Juan Rafael , O’Sullivan Ewan , Rots Arnold
Published: August 2023

We present the extensive and well-characterized Chandra X-ray Galaxy Catalog (CGC) of 8547 galaxy candidates in the redshift range z ∼ 0.04–0.7, optical luminosity 1010–1011
Lr

⊙, and X-ray luminosity (0.5–7 keV) L
X = 2 × 1040–2 × 1043 erg s−1. We estimate a ∼5% false-match fraction and contamination by quasi-stellar objects (QSOs). The CGC was extracted from the Chandra Source Catalog version 2 (CSC2) by cross-correlating with optical and IR all-sky survey data, including the Sloan Digital Sky Survey, Pan-STARRS, DESI Legacy, and Wide-field Infrared Survey Explorer (WISE). Our selection makes use of two main criteria that we have tested on the subsample with optical spectroscopical identification. (1) A joint selection based on X-ray luminosity (L
X) and X-ray-to-optical flux ratio (F
XO), which recovers 63% of the spectroscopically classified galaxies with a small contamination fraction (7%), which is a significant improvement over methods using L
X or F
XO alone (<50% recovery). (2) A joint W1–W2 (W12) WISE color and L
X selection that proves effective in excluding QSOs and improves our selection by recovering 72% of the spectroscopically classified galaxies and reducing the contamination fraction (4%). Of the CGC, 24% was selected by means of optical spectroscopy; 30% on the basis of L
X, F
XO, and W12; and 46% by using either the L
X–F
XO or the L
X–W12 selection criteria. We have individually examined the data for galaxies with z < 0.1, which may include more than one CSC2 X-ray source, leading to the exclusion of 110 local galaxies. Our catalog also includes near-IR and UV data and galaxy morphological types.
Comparison between optical and electrical data on hole concentration in zinc-doped p-GaAs
Authors: Belov Aleksandr G. , Kanevskii Vladimir E. , Kladova Evgeniya I. , Knyazev Stanislav N. , Komarovskiy Nikita Yu. , Parfent'eva Irina B. , Chernyshova Evgeniya V.
Published: August 2023

The optical and electrical properties of zinc-doped Cz p-GaAs have been studied. Reflection spectra of ten p-GaAs specimens have been taken in the mid-IR region. Van der Pau galvanomagnetic, electrical resistivity and Hall coefficient measurements have been carried out for the same specimens (all the measurements were carried out at room temperature). The reflection spectra have been processed using the Kramers–Kronig relations, spectral dependences of the real and imaginary parts of the complex dielectric permeability have been calculated and loss function curves have been plotted. The loss function maximum position has been used to calculate the characteristic wavenumber corresponding to the high-frequency plasmon-phonon mode frequency. Theoretical calculations have been conducted and a calibration curve has been built up for determining heavy hole concentration in p-GaAs at T = 295 K based on known characteristic wavenumber. Further matching of the optical and Hall data has been used for determining the light to heavy hole mobility ratio. This ratio proves to be in the 1.9–2.8 range which is far lower as compared with theoretical predictions in the assumption of the same scattering mechanism for light and heavy holes (at optical phonons). It has been hypothesized that the scattering mechanisms for light and heavy holes differ.
Assessment and cultural ecosystem service mapping in mountain protected areas – “Pirin” National park
Authors: Glushkova Maria , Zhiyanski Miglena , Yaneva Rositsa
Published: August 2023

The assessment and mapping of ecosystems and their services is considered an important action that effectively contributes to proper understanding of how ecosystems support human well-being, and furthermore – to promote the sustainable use of natural resources. The diversity of cultural landscapes, especially in mountain areas, is a significant prerequisite for a variety of cultural ecosystem services that are valuable for the society. This evaluation is the basis for environmental management practices and policymaking. The study presents an approach for assessment and mapping of cultural ecosystem service (CES) “Cultural heritage” that is recognised as important and is provided by mountain protected areas (PAs) in “Pirin” National Park. The data from the Management Plan of “Pirin” NP were used for characterization and biophysical assessment of the condition of forest ecosystems and their potential to provide CESs. The analysis of the results revealed that the conservation regime allowed the territories to preserve a high degree of naturalness and a very good ecological condition as 94.80% of forest ecosystems are assessed with score 4 –“good” condition and 0.44% are with “very good” condition – score 5. The majority of forest ecosystems with “very good” ecological condition are Pinus peuce forests, located mainly on the territory of the reserves “Bayuvi Dupki- Dzhindzhiritsa” and “Yulen”, proving the importance of the protective regime of the territories. Forest ecosystems with average and high capacity to provide ES "Cultural heritage" prevailed, which is consistent with well-preserved and unique nature, the diversity of landscapes, and species richness. Considerable areas were assessed with score 5 – very high capacity, mostly on the territory of the reserves “Bayuvi Dupki- Dzhindzhiritsa” and “Yulen”, and at the foothill of the huts.
AI-driven innovation in ethnic clothing design: an intersection of machine learning and cultural heritage
Authors: Deng Meizhen , Liu Yimeng , Chen Ling
Published: August 2023

This study delves into the innovative application of Artificial Intelligence (AI) and machine learning algorithms in the realm of ethnic fashion design, with a specific emphasis on the Miao women's apparel. We introduce an AI-powered approach that strategically bridges modern technology with traditional elements, denoting a significant stride in the field of fashion design. Our research underscores three major aspects: customization of body shape, fabric selection, and innovative design. An AI-driven statistical methodology was utilized to accurately adapt to the unique body characteristics of Miao women, demonstrating an application of machine learning in pattern recognition. Furthermore, the AI's capacity to analyze the fabric properties was harnessed to optimize material selection, creating a balance between aesthetics and comfort. The innovative use of the Multimodal Unsupervised Image-to-Image Translation (MUNIT) algorithm, an AI tool, generated diverse and trendy designs, thereby enriching the distinctiveness of ethnic apparel. Our study accentuates the synergistic blend of traditional crafting methods and modern technological applications, highlighting the role of AI in the sustainable development of ethnic fashion. Additionally, we also demonstrate the advantages of Made-to-Measure (MTM) approaches, emphasizing the importance of individual customization in contemporary fashion design. This research presents a pioneering exploration at the nexus of AI, pattern recognition, and ethnic fashion design, which has the potential to transform the future of the fashion industry.
Primary resonance and feedback control of the fractional Duffing-van der Pol oscillator with quintic nonlinear-restoring force
Authors: Cui Zhoujin
Published: August 2023

In the present paper, the primary resonance and feedback control of the fractional Duffing-van der Pol oscillator with quintic nonlinear-restoring force is studied. The approximately analytical solution and the amplitude-frequency equation are obtained using the multiple scale method. Based on the Lyapunov theory, the stability conditions for the steady-state solution are obtained. The bifurcations of primary resonance for system parameters are analyzed, and the influence of parameters on fractional-order model is also studied. Numerical simulation shows that when the parameter values are fixed, the curve bends to the right or left, resulting in jumping phenomena and multi-valued amplitudes. As the excitation frequency changes, the typical hardening or softening characteristics of the oscillator are observed. In addition, the comparisons of approximate analytical solution and numerical solution are fulfilled, and the results certify the correctness and satisfactory precision of the approximately analytical solution.
The weighted Lindley exponential distribution and its related properties
Authors: Basalamah Doaa , Alruwaili Bader
Published: August 2023

Both the exponential and Lindley distributions can be used to model the lifetime of a system or process, as well as the distribution of waiting times. In this study, we introduce the $ WLE(\theta, \lambda, \alpha) $ notation for the weighted Lindley exponential distribution. Using two distinct asymmetrical distributions, the skewness mechanism of Azzalini was implemented in this distribution. In other words, we multiplied the density function of the Lindley distribution by the distribution function of the exponential distribution after adding the skewness parameter $ \alpha > 0 $. This $ WLE $ distribution contains the Lindley [1], the two parameters weighed Lindley [2] and the new weighted Lindley [3] distributions as special cases. We investigated the proposed model's mathematical properties. In addition to studying the central moments, we also investigate maximum likelihood estimators. To demonstrate the superiority of our model, we employ the MLE method to fit the weighted Lindley exponential model to the actual data set.
Dynamics analysis of an SVEIR epidemic model in a patchy environment
Authors: Liu Maoxing , Li Yuhang
Published: August 2023

In this paper, we propose a multi-patch SVEIR epidemic model that incorporates vaccination of both newborns and susceptible populations. We determine the basic reproduction number $ R_{0} $ and prove that the disease-free equilibrium $ P_{0} $ is locally and globally asymptotically stable if $ R_{0} < 1, $ and it is unstable if $ R_{0} > 1. $ Moreover, we show that the disease is uniformly persistent in the population when $ R_{0} > 1. $ Numerical simulations indicate that vaccination strategies can effectively control disease spread in all patches while population migration can either intensify or prevent disease transmission within a patch.
Computer Aided Thermal Analysis of the FSW Tool Geometry
Authors: Marin-Corciu Matei , Botila Lia-Nicoleta , Geana Alexandru Adrian
Published: August 2023

The thermal analysis will be realised in a Computer Aided Parametric Design program for three tools with different pin geometries to determine the transfer and distribution of the thermal energy produced during the process and to observe the influence of the pin geometry has on the distribution. Due to the fact that the joining process can be done at a lower temperature than the melting point of the material certain steps must be followed prior and correct selection of the machine’s parameters. Information on the parameters for specific materials and the preparation of the base material are readily available but considering the method of producing the thermal energy necessary for the process the quality of the weld is highly influenced by preheat time (of the material and tool), room temperature, cooling of the tool or work piece if the machine is equipped with such a configuration. We will observe in this study the effect of tool pin geometry over dwell time for reaching a uniform temperature of the tool in the shortest amount of time. The parameters used for the acquiring the data needed for the thermal analysis regarding tool material are tungsten carbide and the material of the plates will be aluminium 1200. The paper’s subject will be the realisation of a thermal analysis of the FSW (Friction Stir Welding) tools.
Fracture Characteristics of EN AW 1200 Tensile Test Specimens Joined with FSW and SFSW Processes
Authors: Binchiciu Emilia-Florina , Botila Lia-Nicoleta , Nicolaeiscu Mircea , Mnerie Gabriela-Victoria
Published: August 2023

The aim of the current study is to perform a preliminary analysis on specimens extracted from 4 mm sheets of EN AW 1200 alloys that were butt-joined using FSW and two SFSW processes. The purpose of this scientific investigation is to promote the suitability and advantages of new ecological joining processes by implementing SFSW in the automotive, naval, railway and aerospace industry. The papers authors performed destructive testing on specimens extracted from sheets joined with the above mentions processes, namely tensile strength test according to SR EN ISO 6892-1:2020. Researchers also performed topography analysis on samples extracted from the AW 1200 but-joined similar sheets using scanning electron microscopy – SEM, combined with energy dispersive X-ray analysis EDAX. Results from the tensile tests highlighted an improvement in the ultimate tensile strength of the welded butt-joint, if compared to regular FSW results. The highest tensile strength value resulted from the samples extracted from joints performed using the second version of SFSW process. Researchers also noticed that samples broke in the weld or transition area. There was also a change in the chemical composition of the sample performed using the first SFSW method, namely, a high concentration of oxide appeared (≥18%), leading to the conclusion that the module used induces rapid oxidation of joints. Experimental data doesn’t comply with automotive, railway, naval and aerospace-imposed compliances, thus further investigations should be done to improve the application of the technology.
A Study on Microstructure and Properties of Aluminum Alloy Bracket Produced by a New Semi-Solid Rheo-Diecasting Process
Authors: Chen Song , Zhang Fan , Feng Jian , Zhang Fan , Li Da Quan , Chen Liang
Published: August 2023

The performance of bracket component is low with uneven micro-structure, internal porosity and shrinkage defects produced by traditional liquid die casting process which cannot be strengthened by T6 heat treatment. In this paper, the aluminum alloy bracket with high-performance and light weight was prepared by a novel semi-solid slurry preparation technique that included chilling rod stirring and funnel-shaped cylinder device, which rapidly reducing the liquid temperature to near liquidus and realizing explosive nucleation. The effects of pouring temperature and CRS process on the microstructure and mechanical property of bracket were studied by optical microscopy (OM) equipped with polarizing mode and bench failure test. The results show that the as-cast microstructure mainly consists of near-spherical α-Al. And the semi-solid micro-structure was affected by these two critical parameters, the pouring temperature and CRS process. Without the condition of stirring, the micro-structure is typical dendritic with a certain proportion of fine spherical crystals, which was mainly generated during the filling of die casting process. And with the addition of the chilling rod, the finer and more uniform spherical semi-solid micro-structure was obtained with the lower pouring temperature. Based on the above semi-solid process and flow controlling through the mould design and vertical die casting process optimization, the high-performance bracket component without shrinkage can be prepared. Additionally, compared with the liquid die casting process, the internal quality and bench testing force of bracket prepared by CRS vertical die casting process are significantly improved.
Friction Stir Welding in Liquid Working Environment (SFSW) of EN AW 1200 Aluminum Alloy
Authors: Botila Lia-Nicoleta , Perianu Ion Aurel , Marin-Corciu Matei , Geana Alexandru Adrian , Duma Iuliana , Popescu Radu Nicolae
Published: August 2023

Friction stir welding is an important topic within ISIM Timisoara, with several research projects being implemented in this field. Friction stir welding in liquid working environment aims to avoid overheating of the welding tool and device during the joining process and achieve better results compared to FSW welding in ambient environment. The paper presents results obtained by ISIM Timisoara in the framework of a national research project (in progress), regarding the friction stir welding in liquid environment (SFSW) of the EN AW 1200 aluminum alloy. The experimental research aimed at an analysis of the SFSW welded joints for the EN AW 1200 aluminum alloy, made with four different welding tool geometries, under the same working conditions regarding the FSW welding machine and the technological process parameters.
Structural Refinement, Dielectric and Electromechanical Properties of (1-x)NBT-xKBT Piezoceramics in the Morphotropic Phase Boundary Region
Authors: Mesrar M. , Gouitaa Najwa , Echatoui N.S. , Abdi Farid , Lamcharfi Taj-Dine
Published: August 2023

Lead-free ferroelectric materials of sodium-potassium bismuth titanate, (1-x)NBT-xKBT systems were synthesized by a hydrothermal process. In this way, the appropriate conditions for the hydrothermal synthesis of NBT and KBT (i.e., concentrations of synthetic precursors, solution pH and temperature) are given graphically. Ceramics of (1-x)NBT-xKBT with (x(mol.%) = 0; 12; 16; 20; 30 and 100) were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The rhombohedral-tetragonal morphotropic phase boundary (MPB) was confirmed to be in the region of 0.12 ≤ x ≤ 0.20 for (1-x)NBT-xKBT at ambient temperature. Scherrer's formula and the Williamson-Hall (W-H) analysis were used to examine the average crystallite size and lattice strain. Raman spectroscopy was effectively applied to study the structural evolution of the (1-x)NBT-xKBT phase. The ceramics exhibited a high temperature of maximum dielectric permittivity at (Tmax = 343 °C at 100 kHz) along with electromechanical coupling factors (kp = 0.34, d33 = 147 pC/N). Based on the composition of all specimens, the results indicate a diffuse phase transition, probably of second order, between ferroelectric and paraelectric phases.
Mechanical Properties of Welded by Friction Stir Welding Aluminium Alloy AA 5754
Authors: Ferdinandov Nikolay , Gospodinov Danail , Ilieva Mariana , Radev Rossen
Published: August 2023

Friction stir welding is one of the most original methods for welding devised in recent years. As this welding method possesses advantages compared to conventional fusing welding methods, scientific research on its features and improvement is increasing. The advances in the knowledge of the process of friction stir welding allow its increasing application in different areas, such as aircraft and automotive industries, railway transport, nuclear industries etc. During friction stir welding the joined parts are in a solid state. This welding method is mainly used for joining aluminium and its alloys.The stirring and mixing of the material and the temperature during friction stir welding are the main factors that determine the possibility of obtaining weldments with precise mechanical properties.The present study aims to research the influence of the pin`s configuration on different quality aspects of the weldments at chosen parameters of the welding mode. To achieve this, pins with different geometry and coatings were used. Results that demonstrate the influence of the pin`s geometry and the process parameters on the temperature, structure, and mechanical properties of joined by friction stir welding weldments of aluminium alloy AA 5754 4 mm thick are presented. The influence of the pin`s geometry on defect formation during welding was determined.
Potentiometric (pH-Metric) Methods of Studying Acid-Base Properties on the Surface of Dispersed Materials
Authors: Danchenko Yuliya , Andronov Vladimir , Olijnyk Halina , Kosse Anatoliy , Rastorhueva Mariia
Published: August 2023

The article presents potentiometric (pH-metric) methods that are used to study the acid-base properties of the surface of dispersed materials of different chemical nature. It is shown that the surface of any solid body has a surface hydroxyl-hydrate layer with a set of active adsorption centers (ACA) of different chemical structure and a wide range of acid-base properties. It has been proven that potentiometric (pH-metric) methods of studying dispersed materials in suspensions allow obtaining the most complete information about surface acid-base properties.
Effect of Pb0.8La 0.2Ti0.95O3 Doping on the Electrical and Dielectric Properties of CCTO Compound Synthesized by Hybrid Method
Authors: Slaoui M. , Gouitaa Najwa , Harrach Ahmed , Abdi Farid , Lamcharfi Taj-Dine
Published: August 2023

In this work we studied the effect of the addition PL0.2T on the structural, electrical properties of the CCTO ceramic of (1-x) CaCu3Ti4O12 - x Pb0.8 La0.2Ti0.95O3 ((1-x) CCTO-x PL0.2T) with x=0.0; 0.2; 0.3; 0.4; 0.7and 1.0. The composites materials are prepared by hybrid method (solid-sol-gel) and sintered at 1000 °C for 4H. The X-Ray diffraction results reveal that the PL0.2T crystallizes in pure pseudo-cubic phase with Pm3m space group, while the CCTO show a cubic phase structure with space group Im-3. The composites samples of (1-x) CCTO-x PL0.2T indicate the coexistence of two cubic and pseudo-cubic phases. The SEM image indicate a change in grain shape and decrease of average grain size with increasing of PL0.2T content. The dielectric measurements as a function of temperature, show two anomalies which exhibit a relaxation phenomenon for x=0.2 and x=0.7 and a decrease dielectric constant value, it’s can be explained by the phase transition phenomenon of PL0.2T. The Cole-Cole diagram for all samples showed existence of two semi-arcs attributed to the grains and grains boundary, and it is found that the Rg values are smaller than the Rgb. The electrical properties give evidence on the formation of interior, barrier layer capacity (IBLC).
CHIVA treatment for pelvic leak points in men
Authors: Deng Jianping , Zhu Xiaoyin , Du Xin , Su Lei , Gu Yijian , Zhang Qiang
Published: August 2023

Pelvic Leak Points (PLPs) are a possible cause of varicose veins of the lower limbs even in men, and can be easily overlooked without a thorough assessment, or leading to incorrect treatment with high recurrence rate. CHIVA is a minimally invasive approach by recorrecting hemodynamic changes, preserving the venous drainage network in lower extremity. In this study, we present two cases of male patients with symptomatic varicose veins related to PLPs that were successfully treated with the CHIVA method. With proper venous hemodynamic assessment and strategic support, CHIVA could be a safe and effective way to treat PLPs in men.
In vitro comparative effects of laser photodynamic therapy with methylene blue or aminolevulinic acid on oral squamous cell carcinoma cell line
Authors: Khosravi Maryam , Shirani Amir Mansour , Ostadsharif Maryam , Saravani Ramin
Published: August 2023

Background:

This study aimed to compare the effects of laser photodynamic therapy (PDT) with methylene blue (MB) or aminolevulinic acid (ALA) on the oral squamous cell carcinoma (OSCC) cell line.

Materials and Methods:

In this in vitro experimental study, the C152 (KB) OSCC cell line was cultured in a culture medium containing 10% fetal bovine serum. The cells were exposed to 0.1, 0.2, 0.5, 1, 2, 5, and 10 mM concentrations of MB and ALA alone and combined with diode laser irradiation with 660 nm wavelength, 40 mW power, and 10 J/cm2 energy density in continuous-wave mode perpendicular to the surface. Cell viability was assessed using the methyl thiazolyl tetrazolium assay and compared among the groups by the Kruskal–Wallis test.

Results:

The results showed that the reduction in cell viability in the MB + laser and ALA + laser groups was greater than that in the MB and ALA groups without laser (P < 0.001). Significant differences were noted in cell viability in the presence of some different concentrations of MB and ALA (P < 0.05), such that by an increase in their concentration, cell viability decreased. Cell viability in the MB + laser group was significantly lower than that in the ALA + laser group in some photosensitizer concentrations (P < 0.05).

Conclusion:

Within the limitations of this in vitro study, the results showed that laser PDT with MB (high concentrations) was more effective than laser PDT with ALA against the OSCC cell line.
Evaluation of the effect of amalgam fillings on the diagnosis of proximal caries using cone-beam computed tomography technique
Authors: Abdinian Mehrdad , Sharifi Mohadeseh , Tafti Kioumars Tavakoli
Published: August 2023

Background:

Diagnosis of dental caries using cone-beam computed tomography (CBCT) may be hindered due to several introduced and inherent artifacts. The aim of this study was to evaluate the effect of amalgam fillings on the accuracy of diagnosis of proximal caries in CBCT.

Materials and Methods:

In this in vitro study, 102 extracted human teeth (mandibular and maxillary molars and premolars) were used. Six molars were chosen for mesio-occluso-distal amalgam restorations. Before obtaining the CBCT images, the 96 remaining teeth were stabilized in dental sockets of six dry human skulls in a way that the proximal contacts re-established. Thereafter, six of the molar teeth were replaced by the amalgam-restored teeth and the second group of images was then obtained. All images were evaluated by two independent observers in the panorama view and the presence or absence of caries was recorded. For histopathologic investigations, the teeth were cut and assessed by an oral pathologist using a stereomicroscope. The McNemar test was used for comparison between CBCT assessments and histopathologic evaluations (P < 0.05 was considered statistically significant). In addition, the receiver operating characteristics curve was utilized to evaluate the diagnostic accuracy in different sections of imaging.

Results:

The result sensitivity and specificity of CBCT imaging in the first group of images before placement of the restored teeth were 0.96 and 0.36, respectively. In the second group of images after placement of the restored teeth, these values were 0.78 and 0.18, respectively. Moreover, statistical analysis showed that there is a good agreement in interproximal caries diagnosis between histopathologic and CBCT imaging findings without placement of amalgam restorations (P < 0.001). However, this agreement does not exist after amalgam restorations (P = 0.84).

Conclusion:

Diagnosis of proximal caries using CBCT is not an efficient method where there are amalgam restorations adjacent to the suspected teeth.
Estimation of L-carnitine levels in diabetic completely edentulous patients for implant diagnosis: A cross-sectional study
Authors: George Rinki , Maiti Subhabrata , Ganapathy Dhanraj M.
Published: August 2023

Background:

Carnitine is effective in preventing the accumulation of end products related to lipid peroxidation due to its anti-inflammatory and antioxidant effects. Carnitine also exerts a significant anti-inflammatory role through the downregulation of the nuclear factor kappa beta pathway, which leads to a decrease in the expression of pro-inflammatory cytokines. The aim of the study was to estimate the L-carnitine (L-C) levels in diabetic completely edentulous patients.

Materials and Methods:

A cross-sectional study was conducted after the selection of 60 samples based on the inclusion and exclusion criteria. The collected saliva samples were utilized to measure the levels of L-C using the sandwich enzyme-linked immunosorbent assay (ELISA) method. One hundred microliters of sample was applied to a particular row of wells and incubated for an hour as part of the sandwich ELISA procedure. After the wells had been cleaned, a second batch of monoclonal L-C was added, and they were once more incubated for an hour. The horseradish peroxidase substrate was then applied after washing the second batch as well. To allow the blue-to-yellow color transition, the wells were kept steady. Following the observation of the color shift, the OD was measured, and the concentration was determined using the sandwich ELISA kit's standard curve as an intercept. The data were statistically analyzed using the independent t-test (significant level P < 0.05) and were tabulated.

Results:

The L-C levels have higher levels in nondiabetic patients than in diabetic patients. The difference in the baseline mean value between the groups was statistically significant (P = 0.00). Although it is statistically significant (P = 0.00), the mean value for diabetic individuals is 0.19 as opposed to 0.29 for nondiabetic patients.

Conclusion:

Based on the findings, it can be concluded that L-C improves insulin sensitivity and glucose disposal in diabetic completely edentulous patients.
Simple and Effective Treatment for Otorhinolaryngologic Bleed
Authors: Saleem Abdulmohsin Younus , Jassi Anmar A. , Ahmed Muna Muneer , Al-Allaf Abdul-Wahab
Published: August 2023

Objective: To evaluate the effect of the Surgicel (absorbable hemostat, oxidized regenerated cellulose) in the treatment of otorhinolaryngologic bleed. Methods: A case-controlled study, for two types of treatment of acute otorhinologhic bleed. The study was conducted in the department of Otorhinolaryngology, Mosul General Hospital and alrhma Hospital, from May 2012 to May 2014. Out of 175 patients with acute otorhinolaryngologic bleed, 55 of them were treated with application of Surgicel to the site of bleed in throat, nose or ear in the ward, clinic, during operation or post-operative (Group I) and the other 120 were managed by conventional way (cautery, packs and/or ligation) (Group II). Results: Fifty-two patients, out of the 55 (94.5%) were treated with the application of Surgicel (Group I) and responded well to this way of management and the bleed stopped at once with no need for further treatment, while only in three patients with epistaxis treated by Surgicel application bleed recurred, so two of them were treated by electrical cautery and the third one by the application of Surgicel again. It has been seen that a statistically significantly higher cure rate in the patient treated by the application of Surgicel to bleed site, as compared with the patients treated by the conventional way (94.5% versus 77.5% with the P-value < 0.0001). Conclusions: The treatment of otorhinolaryngologic bleeding by Surgicel is simple, safe, effective method and worth to be tried.
Fecal Encopresis in a Syrian Pediatric Population: 10 Years Experience
Authors: Bozo Mahmoud
Published: August 2023

Objective: To identify the etiology of encopresis in Syrian children, describe the appropriate evaluation of encopresis, and outline the management options available for encopresis. Methods: This is a retrospective study to review children, 5 to 17 years of age, who experienced at least weekly fecal soiling for 6 months or longer. These children were eligible for the study from January 1, 2010 to June 1, 2020 in pediatric gastroenterology outpatient clinic in Damascus, Syria. Results: One hundred twenty children were included in the study: 82 boys (68%) and 38 girls (32%); mean age at enrollment was 7.45 years, mean duration of symptoms before the first consultation was 58.2±38.5 months. One hundred five of these cases (87.5%) were accompanied with chronic constipation; 73 patients followed the treatment (60.8%), and 47 cases (39.2%) dropped out of the protocol. Out of 73 patients, 33 patients were cured (45.2%), 24 improved (32.8%), and 16 remained non-cured (22%). Conclusions: Despite the absence of studies in the Arab countries to review encopresis, this first Syrian study highlighted the etiology of encopresis in Syrian children, described the appropriate evaluation of encopresis, and outlined the management options available for encopresis with a comparable result with the international literature.
Guiding Groove: A New Hypothetical Strategy for Ostectomy and Fenestration in Endodontic Microsurgery
Authors: Sun Jinghua , Zhang Chen , Hou Benxiang
Published: August 2023

Introduction: How to save more bone for the teeth of patients with chronic periapical periodontitis with intact or small defects of the labiobuccal cortical plate in the periapical surgeries is a problem that many dentists are concerned about. The Hypothesis: We came up with a new strategy for periapical surgery by designing a modified osteotomy and fenestration method, which we named the “guiding groove” method. There are two ways to achieve this, one is to perform guided groove positioning under CBCT dynamic navigation, and the other is to design a guide plate that marks the position and direction of the guided groove based on CBCT data before surgery. Evaluation of the Hypothesis: The existence of the “guiding groove” locks in the angle and direction of the ultrasonic root end preparation and retrofilling apparatus, which not only minimizes the deviation of the root canal but also preserves more cortical plate on the labial and buccal sides of the teeth and thus improves the efficiency of treatment. This hypothesis has certain limitations. Firstly, the technical sensitivity of the operation is high, and proficiency in CBCT dynamic navigation technology is required. The accuracy requirements for navigation equipment are also relatively high. It will also increase the patient’s exposure to X-rays. For the guide plate designed before surgery that has already marked the position of the guide groove, it can only accurately avoid the deviation of the operating instrument in the proximal and distal directions, and it is difficult to avoid the deviation of the instrument in the buccal and lingual directions.