bluuebunny/crossref_metadata_2025 huggingface dataset:
Construction Analysis, What (Good) is it?
Authors: Denboer Tony
Published: June 2022

This article discusses the concept and intent of a construction analysis and the value it provides to manufacturers and users of integrated circuits. It describes the basic steps of a construction analysis for semiconductor devices and presents and interprets measurements and observations obtained from the analyses of several ICs.
Terahertz Imaging: A New Technology for Inspection and Quality Control
Authors: Mittleman Daniel
Published: June 2022

This article discusses the basic principles of terahertz time-domain spectroscopy (THz-TDS) and the function and limitations of key components in a THz-TDS system. It also provides examples of some of the ways THz-TD imaging is used alone and in combination with other analytical techniques.
Everzol Red LFB ve Everzol Yellow CGL'nin Zebra Balığı (Danio rerio) Embriyoları Üzerinde Teratojenik ve Gelişimsel Toksisitesinin Değerlendirilmesi
Authors: ÖZHAN TURHAN Duygu
Published: June 2022

Synthetic dyes produced by chemical synthesis are used in textile, food, cosmetic, plastic, and pharmaceutical industries. Of these dyes, azo dyes are a major group of dyes widely used by these industries despite their harm to the environment. A limited number of studies have focused on the impact of dyes on the environment; thus eco-toxicological studies are imperative. The aim of this study was to evaluate the toxic effect of Everzol Red LFB (ERL) and Everzol Yellow CGL (EYC) on zebrafish embryos. Embryos were exposed to 23-600 mg L-1 ERL and EYC for 96 hours and the survival rates, heart rate, hatching rates, and body malformation of these individuals were determined. According to the results of this study, the 96 h LC50 values of the ERL and EYC were determined to be 292 (232-391) and 127 (107-152) mg L-1, respectively. The teratogenic index (TI) values of the ERL and EYC were calculated as 1.37 and 1.49, respectively. ERL and EYC are teratogenic for zebrafish embryos based on the calculated TI value. Both dyes caused significant inhibition of embryonic growth and heart rate in Danio rerio embryos. ERL and EYC caused pericardial edema, yolk sac edema, tail malformation, and spinal curvature in embryos. According to the determined parameters, the negative effect of EYC on zebrafish larvae is greater than of the ERL. These results indicate that both dyes have adverse effects on zebrafish development and may adversely affect the aquatic ecosystem if they enter the aquatic environment.
The Flora of Koz Mountain (Genç/Bingöl) and its Surroundings
Authors: ÇETİN Abdurrahim , BEHÇET Lütfi
Published: June 2022

The flora of Mount Koz (Genç-Bingöl) and its surroundings was studied between 2019-2021. As a result of the identification of 1506 specimens collected from the area, 625 taxa (415 species, 147 subspecies, and 63 varieties) belonging to 289 genera and 68 families were identified. Two taxa of the determined plants are members of Pteridophyta and 623 taxa are members of Spermatophyta. of the Spermatophyta members, 621 taxa belong to Angiospermae and two taxa to Gymnospermae subdivisions. of the Angiospermae members, 498 taxa are in the Dicotyledones and 123 taxa Monocotyledones classes. 49 taxa of the plants identified in the study are endemic and the endemism rate is 7.84%. The phytogeographical region element distributions of the determined taxa are as follows: Irano-Turanian 192 (30.72%), Mediterranean 60 (9.60%), Euro-Siberian 49 (7.84%), and multi-regional or unknown phytogeographical region 324 (51.84%). The order of the first 10 families with the highest taxa number is as follows: Asteraceae (85), Poaceae (65), Fabaceae (52), Caryophyllaceae (38), Lamiaceae (38), Brassicaceae (34), Boraginaceae (29), Apiaceae (23), Rosaceae (20), and Plantaginaceae (13). The top 10 largest genera are respectively designated as Trifolium (14), Astragalus (13), Centaurea (11), Allium (10), Vicia (8), Galium (8), Ranunculus (8), Bromus (8), Veronica (8), and Silene (7). Life form evaluation of the determined taxa is as follows: 285 (45.60%) are hemicryptophytes, 178 (28.48%) therophytes, 83 (13.28%) cryptophytes, 37 (5.92%) chamaephytes, and 42 (6.72%) phanerophytes.
Dianthus pseudarmeria (Caryophyllaceae) Türünün Türkiye’den Yeni Bir Alttürü
Authors: KOÇ Murat , HAMZAOĞLU Ergin
Published: June 2022

The samples collected from the Pınarhisar district (Kırklareli, Turkey) were introduced as a new subspecies for the scientific world. Dianthus pseudarmeria subsp. glabripetalus grows in oak forest clearings with an altitude of about 250-350 meters. The new subspecies are similar in terms of many vegetative and generative characters with D. pseudarmeria (subsp. pseudarmeria). However, the new subspecies differs from D. pseudarmeria (subsp. pseudarmeria) by the fact that scales of the epicalyx are striped-lanceolate or reverse-lanceolate and the petal limbin is glabrous. Conclusively, description of the subspecies, seed morphology, descriptive and explain photos, distribution, general ecological preferences are given. In addition, a suitable category of threats to the conservation of the subspecies is proposed in light of the available data.
L’autonomie des universités et le développement de leurs ressources
Authors: Mairesse Marie-Pierre
Published: June 2022

Les difficultés financières rencontrées par de nombreuses universités dans les années 2010 les ont contraintes à initier une véritable réflexion sur leur structure budgétaire. Bien que le financement public constitue plus de 80 % des ressources consolidées, aujourd’hui, la question des ressources propres devient incontournable.
Le télétravail dans les collectivités locales : après la covid, une nouvelle ère des relations au travail ?
Authors: Leblong-Masclet Gwenaël , Randriamanantena Nils
Published: June 2022

Dans le cadre du retour d’expérience de la gestion de crise Covid-19, l’Association des administrateurs territoriaux de France (AATF) a étudié les tendances d’évolution du télétravail par les collectivités locales. Alors qu’elle était marginale avant la crise, cette question est désormais reconnue comme un sujet stratégique majeur. Cette évolution rapide et radicale implique des ajustements profonds du dispositif managérial, en veillant aux risques psycho-sociaux émergents, et au maintien des équilibres sociaux.
Aspects de l’évolution récente du régime des organismes publics non-étatiques au Cameroun : l’apport des décrets d’application des lois du 12 juillet 2017 portant statut des entreprises et établissements publics
Authors: Nguimfack Voufo Théophile
Published: June 2022

Les décrets d’application des lois du 12 juillet 2017 portant statut des entreprises et établissements publics complètent la réforme du régime de ces organismes publics au Cameroun. Toutefois, leur application demeure délicate du point de vue de la responsabilité managériale et de la soutenabilité financière des rémunérations du personnel.
A Need Analysis on Development of Creative Thinking Skills: A Phenomenological Study
Authors: Tok Şükran , Dolapçıoğlu Sevda , Akgün Özpolat Eda
Published: June 2022

This study adopts a qualitative research design aiming at investigating the perceptions of English language teachers about creative thinking skills in their courses. Six teachers working at the School of Foreign Languages at a state university participated in this study. They had similar educational backgrounds and different years of experience. In terms of teaching English, participants were interviewed in-depth about the conceptualization of creative thinking skills. The purpose of the study was to identify teachers’ perspectives and their ways of implementing sub-dimensions of creative thinking in both face-to-face and online lessons. Semi-structured interview questions were used to collect data in the study and the data were analysed through content analysis method using NVivo 12. The findings of the research are grouped under the following headings: Barriers to Creating a Thinking Class Environment, Existing Supporters, and Defining the Concept. Results revealed that the teachers have defined the ability to think creatively considering the basic perception they had about the concept which is mainly creating new products. It is also understood that they evaluated the concept and associated the sub-dimensions accordingly. It can be inferred that a deeper understanding and well-organized teaching of creative thinking skills are required to be blended into the foreign language education.
Long-term functional independence after minimally invasive endoscopic intracerebral hemorrhage evacuation
Authors: Ali Muhammad , Zhang Xiangnan , Ascanio Luis C. , Troiani Zachary , Smith Colton , Dangayach Neha S. , Liang John W. , Selim Magdy , Mocco J , Kellner Christopher P.
Published: June 2022

OBJECTIVE

Intracerebral hemorrhage (ICH) is a devastating form of stroke with no proven treatment. However, minimally invasive endoscopic evacuation is a promising potential therapeutic option for ICH. Herein, the authors examine factors associated with long-term functional independence (modified Rankin Scale [mRS] score ≤ 2) in patients with spontaneous ICH who underwent minimally invasive endoscopic evacuation.

METHODS

Patients with spontaneous supratentorial ICH who had presented to a large urban healthcare system from December 2015 to October 2018 were triaged to a central hospital for minimally invasive endoscopic evacuation. Inclusion criteria for this study included age ≥ 18 years, hematoma volume ≥ 15 ml, National Institutes of Health Stroke Scale (NIHSS) score ≥ 6, premorbid mRS score ≤ 3, and time from ictus ≤ 72 hours. Demographic, clinical, and radiographic factors previously shown to impact functional outcome in ICH were included in a retrospective univariate analysis with patients dichotomized into independent (mRS score ≤ 2) and dependent (mRS score ≥ 3) outcome groups, according to 6-month mRS scores. Factors that reached a threshold of p < 0.05 in a univariate analysis were included in a multivariate logistic regression.

RESULTS

A total of 90 patients met the study inclusion criteria. The median preoperative hematoma volume was 41 (IQR 27–65) ml and the median postoperative volume was 1.2 (0.3–7.5) ml, resulting in a median evacuation percentage of 97% (85%–99%). The median hospital length of stay was 17 (IQR 9–25) days, and 8 (9%) patients died within 30 days of surgery. Twenty-four (27%) patients had attained functional independence by 6 months. Factors independently associated with long-term functional independence included lower NIHSS score at presentation (OR per point 0.78, 95% CI 0.67–0.91, p = 0.002), lack of intraventricular hemorrhage (IVH; OR 0.20, 95% CI 0.05–0.77, p = 0.02), and shorter time to evacuation (OR per hour 0.95, 95% CI 0.91–0.99, p = 0.007). Specifically, patients who had undergone evacuation within 24 hours of ictus demonstrated an mRS score ≤ 2 rate of 36% and were associated with an increased likelihood of long-term independence (OR 17.7, 95% CI 1.90–164, p = 0.01) as compared to those who had undergone evacuation after 48 hours.

CONCLUSIONS

In a single-center minimally invasive endoscopic ICH evacuation cohort, NIHSS score on presentation, lack of IVH, and shorter time to evacuation were independently associated with functional independence at 6 months. Factors associated with functional independence may help to better predict populations suitable for minimally invasive endoscopic evacuation and guide protocols for future clinical trials.
Elevated cerebrospinal fluid iron and ferritin associated with early severe ventriculomegaly in preterm posthemorrhagic hydrocephalus
Authors: Mahaney Kelly B. , Buddhala Chandana , Paturu Mounica , Morales Diego M. , Smyser Christopher D. , Limbrick David D. , Gummidipundi Santosh E. , Han Summer S. , Strahle Jennifer M.
Published: June 2022

OBJECTIVE

Posthemorrhagic hydrocephalus (PHH) following preterm intraventricular hemorrhage (IVH) is among the most severe sequelae of extreme prematurity and a significant contributor to preterm morbidity and mortality. The authors have previously shown hemoglobin and ferritin to be elevated in the lumbar puncture cerebrospinal fluid (CSF) of neonates with PHH. Herein, they evaluated CSF from serial ventricular taps to determine whether neonates with PHH following severe initial ventriculomegaly had higher initial levels and prolonged clearance of CSF hemoglobin and hemoglobin degradation products compared to those in neonates with PHH following moderate initial ventriculomegaly.

METHODS

In this observational cohort study, CSF samples were obtained from serial ventricular taps in premature neonates with severe IVH and subsequent PHH. CSF hemoglobin, ferritin, total iron, total bilirubin, and total protein were quantified using ELISA. Ventriculomegaly on cranial imaging was assessed using the frontal occipital horn ratio (FOHR) and was categorized as severe (FOHR > 0.6) or moderate (FOHR ≤ 0.6).

RESULTS

Ventricular tap CSF hemoglobin (mean) and ferritin (initial and mean) were higher in neonates with severe versus moderate initial ventriculomegaly. CSF hemoglobin, ferritin, total iron, total bilirubin, and total protein decreased in a nonlinear fashion over the weeks following severe IVH. Significantly higher levels of CSF ferritin and total iron were observed in the early weeks following IVH in neonates with severe initial ventriculomegaly than in those with initial moderate ventriculomegaly.

CONCLUSIONS

Among preterm neonates with PHH following severe IVH, elevated CSF hemoglobin, ferritin, and iron were associated with more severe early ventricular enlargement (FOHR > 0.6 vs ≤ 0.6 at first ventricular tap).
Integrating Accounting and Logistics Strategy in Business Management
Authors: PYLYPENKO О.
Published: June 2022

The effective business management in adverse economic conditions necessitates the search for ways for integrating business accounting with innovative approaches to business management of material resources, especially the logistics system.   

The need to integrate business accounting of material assets with the logistics system is substantiated by giving evidence of the complicating conditions for transportation of material assets in recent years, related, inter alia, with quarantine limitations. It is stressed that the requirements to logistics strategies are increasing along with growing transportation costs, diminishing deposits of natural resources, creating new product lines, setting new criteria for social, technological and environmental dimensions of business activities. It argued that when management staff overlook or ignore the potentials offered by logistics tools for management of material resources or when business accounting has no links with logistics, the impact of management on the purchase of material assets will be less effective.   

Theoretical foundations of the integration of business accounting and logistics strategy of transactions with material assets for the achievement of economic security of business activities are highlighted. The principal dimensions for such integration (organizational, methodological, control and protective) and their key components are discussed. Organizational and technical schemes are proposed, aimed at creating a business accounting system integrated with other management functions (planning, economic analysis, control), in order to enhance the orientation of business enterprise on the effectiveness of logistics activities and achievement of economic security. The main objectives of business accounting with respect to logistics costs are determined for the business enterprises implementing the abovementioned approach to organization of logistics management.
Socio-Economic Security of the Region: Methodological Approaches to Evaluation and Achievement
Authors: LUNOVA Т.
Published: June 2022

The purpose of the article is to form methodological bases for assessing and ensuring socio-economic security of the region. The relevance of the study is due to the fact that the stability and viability of the state largely depends on the level of socio-economic security of its administrative-territorial units.

The article identifies the essence of socio-economic security of the region by studying two categories: social and economic security. The goals and sequence of development of the Program for strengthening the socio-economic security of the region are substantiated. An algorithm for assessing the level of socio-economic security of the region using an integrated indicator is proposed.

The most significant threats to the socio-economic security of the region are characterized, among which are: uneven territorial development of the country; deepening structural disparities in regional labor markets; low level of technology use; deteriorating investment climate; rising unemployment; poverty growth; changing demographic situation and others. A list of indicators of socio-economic security of the region by economic, social and environmental spheres has been formed. As an example, the weights for the selected indicators are determined, as well as their reference or limit values.

It is concluded that in substantiating the directions of strengthening the socio-economic security of the region should take into account both the results of the assessment and the factors that determine its specificity, in particular: geographical location; transit theory; natural resource potential; areas of economic specialization; the level of state support in the region.
A Study of Modern Trends in Database and Data Repository Technologies as the Technological and Architectural Basis for the Creation of Software and Intelligent Systems by Means of Modern Programming Languages. Part 2
Authors: YERSHOVA O. , STAVYTSKYI О.
Published: June 2022

The article contains an analytical review of developments in database technologies, made on the basis of reports prepared by the results of eight meetings of database specialists held throughout 1988–2013. Objects of the analysis are most interesting predictions given in the reports: their realism, accuracy, pragmatism or, vice versa, utopianism or opportunism.   

The article consists of two parts.

Part 1 is devoted to analysis and evaluation of predictions made in the reports of the four earlier meetings held in 1988, 1990, 1995, and 1996. These predictions are about creation, development and uses of decision support systems, database appliances, graphic processing units, operating systems, interface for structured query language, database applications, information distribution, universal database management systems, query optimization criteria, intellectual analysis of database within database management systems. A detailed description of research themes in the field of databases, which got the priority status in that time, is given: recording and computation of data, security and confidentiality of data, replication and harmonization of data, structuring of data, intellectual analysis of data, data warehouses.   

Part 2 is devoted to an analytical review of the predictions contained in the reports on the meetings held in 1998, 2003, 2008, and 2013. The predictions are about self-adjustment of database systems, rethinking of the traditional database architecture as a result of new hardware capabilities. They make special emphasis on the feasibility of manipulations with structured and unstructured data within DSS architecture, support of Big Data technology, with outlining the themes of research aimed at implementation of its potential.
Saudi Arabia – China: Partnership Strategy
Authors: Derbenev Andrei
Published: June 2022

The mood for a strategic partnership between Riyadh and Beijing grows stronger every day. Both countries are well-established on the international stage and have sufficiently mastered the most modern tools of market interaction, paving the way for a continuous improvement of cooperation in all areas. The process of dynamic growth of financial, economic, trade and other indicators has long been accompanied by a mutually beneficial dialogue between the two nations on security in general, and cargo transportation in particular, as well as other pressing issues that the peoples of both countries face today. These problems traditionally occupy the minds of the politicians of China and Saudi Arabia. Riyadh is making great efforts to diversify its economy and is therefore keen to expand its cooperation with the People's Republic of China. Chief among China's interests in the Middle East is continued access to the region's energy resources, on which its economy largely depends, making supplies to China vulnerable to waves of turbulence in the Middle East since the Arab Spring. Energy cooperation and the creation of infrastructure, including the construction of seaports and transport infrastructure, which are critically important for improving the safety of navigation. The article analyses the national project “Vision of Saudi Arabia 2030” and the initiative of the People's Republic of China “One Belt, One Road” (BRI) as one of the main goals of expanding cooperation between Saudi Arabia and China.
Quick Response Code for Inventory System Development (Case study : Accounting Unit At Ujung Pandang State Polytechnic)
Authors: Hayani Hayani , Raharjo Muh. Fajri , Tungadi Eddy
Published: June 2022

QR stands for Quick Response, which is in accordance with its purpose is to convey information quickly and get a fast response as well. In contrast to barcodes which are only able to store information horizontally, QR codes are able to store information both horizontally and vertically. So that automatically QR codes have the ability to store more data than barcodes. QR codes can be used in the inventory system at the State Polytechnic of Ujung Padang to make it easier to read inventory data.In this study, the author will create an inventory system using a QR Code. The inventory system will be made online so that it can make it easier for admins and staff to process data and present information. This system is made in PHP and usesÂ  MySQL database for data storage, while the QR code is created using the Ciqrcode library. While in reading the QR code on the android application using the Zxing library. The inventory system built can make it easier to process inventory data and present information to the Accounting Unit at State Polytechnic of Ujung Padang.
ECOLOGİCAL FEATURES OF THE PHOTOCHEMİCAL PROPERTİES OF TİO2 NANOPARTİCLES
Authors: E.M.Gadirova E.M.Gadirova
Published: June 2022

TiO2 nanoparticles have recently been widely used in environmentally important reactions.TiO2 particles have been studied by XRD, TEM, SEM analysis. It has been determined that the size of nanoparticles is homogeneous and generally varies between 10-30 nm.The results were consistent with the calculations by the Sherrer method. The results of the SEM analysis were the same as the XRD analysis.In the XRD spectra of TiO2 nanoparticles, the points at all peaks were accurately checked and the TiO2 nanoparticles matched the rutile phase.According to the Scherrer method, the average size of TiO2 according to the diffraction point (101) was 10.3, the specific surface area of the crystals was 159.6 m2/g.The signals for TiO2 nanoparticles had characteristic peaks at 27.90° (110), 36.01° (101), 41.58°(111), and 54.71°(211).
Keywords: XRD, SEM, TEM, nano-TiO2, photochemical reactions.
Predictive Modelling of Creep Crack Initiation and Growth using Extended Finite Element Method (XFEM)
Authors: Meor Ahmad Meor Iqram , Mohd Sabri Mohd Anas , Mat Tahir Mohd Faizal , Abdullah Nur Azam
Published: June 2022

In this study, a numerical strategy for predictive modelling of creep in tension tests for the rectangular plate with a single crack and CT-specimen based on the extended finite element method (XFEM) will be described in detail. A model of creep fracture initiation and creep crack growth (CCG) is developed, while the XFEM is employed to spots located inside the finite element for the purpose of predicting crack potential and propagation. In order to characterize the creep fracture initiation, identification of C(t)-integral formula is conducted. In addition, XFEM and analytical solutions are also analyzed to look at the connection of C(t)-integral with time for a rectangular plate with a single crack under plane stress conditions. An illustration showing the se-quence of stress distribution and displacement contour plots are also being presented. The stresses and displacements spread throughout the crack path have also been determined using CT-specimens. In addition, the creep cracks growth length with normalized time and the creep crack growth rate with the C(t)-integral are predicted to be related, indicating that the numerical results are in good accord with the experimental results.
Effects of residual stresses on interlaminar radial strength of Glass-Epoxy L-bend composite laminates
Authors: Umarfarooq M.A. , Gouda P. S. Shivakumar , Bharath K. N. , Veereshkumar G. B. , Banapurmath N. R. , Edacherian Abhilash
Published: June 2022

The built-in heterogeneity of the composite laminates has been exploited to tailor the stiffness and strength requirements of modern structures to meet the specific functional demands. However, the non-homogeneity in these composites is the root cause for most of their failures. One of the undesirable consequences of the inherited heterogeneity is the development of cure-induced stresses during composite manufacturing. This work aims to investigate the influence of process-induced stresses on interlaminar radial strength in curved composite laminates. Glass-Epoxy (GE) laminates of two different thicknesses were prepared by hand lamination technique using V-shaped tooling and cured under room temperature. The state of residual stresses in GE laminates is varied by post-curing these laminates at different temperatures. Curved bending strength (CBS) and corresponding interlaminar radial stress for delamination of L-bend laminates were evaluated experimentally using four points bending test. The residual stress profile in each GE laminate is experimentally characterized by employing the Slitting method. The results indicate that the residual stresses have a negligible effect on the critical stress for initial delamination in GE laminates. But, the critical stress for delamination was found to be independent of the laminate thickness and increased with higher curing temperatures. The delaminated surfaces of L-bend laminates were studied using a scanning electronic microscope (SEM). The enhancement in the critical stress due to post-curing can be attributed to the improved fiber-matrix interfacial bonding with higher curing temperature.
Hybrid phase-field modeling of multi-level concrete gravity dam notched cracks
Authors: Santillan Sanchez David , Mazighi Hichem , Mihoubi Mustapha Kamel
Published: June 2022

Phase-field models have become a powerful tool to simulate crack propagation. They regularize the fracture discontinuity and smooth the transition between the intact and the damaged regions. Based on the thermodynamic function and a diffusive field, they regularize the variational approach to fracture that generalizes Grifﬁth’s theory for brittle fracture. Phase-field models are capable to simulate complex fracture patterns efficiently and straightforwardly. In this paper, we introduce a hybrid phase-ﬁeld approach to simulate the crack propagation in laboratory-scale and life-scale structures. First, we apply our methodology to the three-point bending test on notched laboratory beams. Second, we simulate the fracture propagation in a life-size structure: the Koyna gravity dam. We account for the pressure load inside the fracture, and we study the effect of the position and number of initial fractures in the upstream face and the value of the Grifﬁth critical energy release, on the fracture propagation under a flood event. The position of the fracture plays an important role in the final fracture pattern and crest displacements, whereas the value of the Grifﬁth critical energy release alters the onset of the fracture propagation. We conclude that phase-ﬁeld models are a promising computational tool that may be applied to real engineering problems.
A simplified constitutive model for a SEBS gel muscle simulant - Development and experimental validation for finite elements simulations of handgun and rifle ballistic impacts
Authors: Andreotti Riccardo , Leggewri Valentina , Casaroli Andrea , Quercia Mauro , Bettin Cristian , Zanella Mauro , Boniardi Marco V.
Published: June 2022

An original simplified constitutive model is proposed to simulate the effects of ballistic impacts on blocks of synthetic muscle simulant based on mineral oil and styrene ethylene-butylene styrene polymers (SEBS) as a convenient substitute for Fackler ballistic gelatin. The model is based on a quasi-static elastic-plastic model associated with hydrodynamic properties regulated by a polynomial equation of state. The paper illustrates the development and experimental validation of the model to simulate 9x21mm FMJ round-nose, 7.62x39 mm FMJ, and 5.56x45 mm NATO bullets penetrating 145x145x400 mm gel blocks. All material parameters are provided to be implemented in built-in LS-Dyna keywords. The validation confirms the effectiveness of the model and suggests possible further developments. The work also confirms the tested synthetic gel as a valid and convenient substitute for Fackler 10% ballistic gelatin at 4 °C.
An experimental study and a proposed theoretical solution for the prediction of the ductile/brittle failure modes of reinforced concrete beams strengthened with external steel plates
Authors: Nguyen-ngoc Long , Nguyen Van Hau , Bui Tien Thanh , Pham Van Phe
Published: June 2022

An experimental study and a proposed theoretical solution are conducted in the present study to investigate the ductile/brittle failure mode of reinforced concrete beams strengthened with an external steel plate. The present experimental study has fabricated and tested six steel plate-strengthened RC beams and one non-strengthened RC beam under 4-point bending loads. The proposed theoretical model is then developed based on the observed experimental results to analyze the crack formation, to determine the distance between vertical cracks and to quantitatively predict the ductile/brittle failure mode of plate-strengthened RC beams. The experimental study shows that the failure mode is based on the sliding of concrete along with the external plate. This slip is limited between two vertical cracks, from which the maximum stress in the external steel is determined. Based on comparisons conducted in the present study, excellent agreements of the stresses/strains in soffit steel plates, crack distances, and system failure modes between the current theoretical solution and the previous and present experimental results are observed.
Observing the simulation behaviour of Magnesium alloy metal sandwich panel under cyclic loadings
Authors: Shamsul Baharin Muhammad , Abdullah Shahrum , Md Nor Noorsuhada , Muhamad Paudzi Mohd Khairul Faidzi , Arifin Azli , Karam Singh Salvinder Singh
Published: June 2022

This study aims to investigate the delamination effect of a metal sandwich panel using a four-point bending simulation under continual spectrum loading. The most recent core designs of the sandwich panel have a cavity that can increase vulnerability in terms of bonding strength under constant cyclic loading. The sandwich panel is simulated under constant cyclic loading using different core design configurations, which are rounded dimple, hemispherical dimple, and smooth surface core design. There are two types of conditions used; no pre-stress and pre-stress loads with variable stress ratios based on Gerber stress life theory. Results showed that dimple core design enhanced mechanical behaviour and fatigue life performance about 33% and 5%, respectively, compared to the sandwich panel with a smooth surface core design. It is highlighted that modification on the surface of core design could be beneficial to enhance the bonding strength performance of sandwich panels and prevent early delamination under extreme conditions such as constant cyclic loading. This study is beneficial to enhance the bonding strength for sandwich panels against extreme conditions such as high impact load and continuous cyclic load.
Numerical Analysis of the Crack Growth Path in the Cement of Hip Spacers
Authors: Zengah Sahnoun , Mankour Abdeljelil , Abderahmane Sahli , Salah Hichem , Mallek Abdelhafid , Bouziane Mohammed Mokhtar
Published: June 2022

The use of temporary hip prosthesis made of orthopedic cement (spacer) in conjunction with antibiotics became a prevalent method used for prosthetic infections remedy; consequently, this method makes bone cement (PMMA) more fragile. Hence, the necessity of reinforcement incorporation is crucial to strengthen the bone cement. In this study, the finite element (FE) method was used to analyze the spacers behavior. FE model using an implicit integration method was used to simulate the mechanical behavior of the spacer under static loading. In addition, the extended finite element method (XFEM) was also used to investigate the fracture behavior of the non-reinforced and reinforced spacers. The results of this numerical analysis showed that the simulated crack initiation and propagation were in a good accordance with in vivo radiography and in vitro experimental observations. The full-stem reinforcement of 8 mm using reduce significantly the stress intensity factor and, consequently prevent the spacer fracture effectively. The FE models developed in this study contribute to help mechanical designers and engineers for prostheses’ quality and durability improvement. Abstract must be 200 words maximum, without figures or refs.
Effect of reinforcement type on structural behavior of RC beams containing recycled aggregate
Authors: Elsadany Rasha , Al-Tersawy Sherif H. , Sallam Hossam El-Din M.
Published: June 2022

Concrete containing wastes from the demolition of old deteriorated buildings are produced enormously. Concrete is a brittle matrix that is usually reinforced by ductile reinforcement such as steel bars. However, due to the susceptibility of steel to corrosion, fiber-reinforced polymers (FRP) bars are used as an alternative reinforcement. The main drawback of FRP bars is their brittleness. These two types of reinforcements, i.e. steel and glass FRP (GFRP) bars, have been used in the present work. The flexural behavior of twelve RC beams reinforced with different ratios of GFRP or steel areas containing recycled aggregate has been experimentally studied and compared with beams without recycled aggregate. The present results show that beams reinforced with GFRP and containing recycled aggregate exhibit a lower load-carrying capacity, lower first crack, and higher deflection than all beams. All GFRP RC beams exhibited brittle failure, i.e., concrete crushing in the compression zone, except one beam, with 2f16 bars and concrete without recycled aggregate, which showed catastrophic failure, i.e., the rupture in GFRP bars. However, the ductile failure mode is observed for all beams reinforced with steel bars, i.e., yielding in steel bars followed by concrete crushing
Finite-element study of residual stress distribution in Ti-6Al-4V alloy treated by laser shock peening with varying parameters
Authors: Kostina Anastasiia , Zhelnin Maxim , Gachegova Elena , Prokhorov Alexander , Vshivkov Aleksei , Plekhov Oleg , Swaroop Sathya
Published: June 2022

Laser shock peening (LSP) is used to enhance surface quality of the metallic structures by the generation of compressive residual stresses on it. This work studies the effect of the main LSP parameters on residual stress fields by the finite-element method. The specimen under investigation is a square plate with a thickness of 3 mm made of Ti-6Al-4V. The performed analysis enhances understanding of LSP application to structures manufactured from this material and this information can be useful for a choice of optimal peening parameters. The effect of the spot size and shape, the pulse energy, the number of peen layers, overlapping of spots and temporal variation of the mechanical pressure induced by plasma is considered and analyzed. A 3D finite-element model based on the Johnson-Cook constitutive relation is developed and verified by the results of residual stress measurements performed for the LSP-treated samples under different conditions. From the obtained results the following main conclusions can be drawn: pulse energy provides the more significant effect although the resulting residual stresses profile tends to some saturation curve; temporal pressure pulse shape and its total duration also substantially alter the residual stress field; the least significant parameter is the spot shape.
Effect of cenosphere and specimen crack lengths on the fracture toughness of Al6061-SiC composites
Authors: Ashoka E. , Sharanaprabhu C. M. , Krishnaraja G. Kodancha
Published: June 2022

Main aim of this work is to investigate the influences of the addition of cenosphere and specimen crack length on the fracture toughness of Al6061-SiC composites. The experimental analysis was carried out for 3, 6 and 9 wt% proportions of cenosphere with the 3 wt% of SiC as reinforcements in the aluminum 6061 matrix for various crack lengths. The fracture toughness of Al6061-SiC-Cenosphere hybrid composites was estimated using compact tension (CT) specimen for the said compositions. The CT specimens were prepared, according ASTM E399 standard, for different crack length to width (a/W=0.3-0.6) ratios. From the experimental outcomes, it is identified that the fracture toughness of the hybrid composite increases upto the 6wt% of cenosphere and further increment in the cenosphere causes the decrement in the values. It is also found that the load bearing capacity and fracture toughness of the hybrid composite decreases with increment in the a/W ratios of the CT specimen.
Natural Frequency based delamination estimation in GFRP beams using RSM and ANN
Authors: Sreekanth T. G. , Senthilkumar M. , Reddy S. Manikanta
Published: June 2022

The importance of delamination detection can be understood from aircraft components like Vertical Stabilizer, which is subjected to heavy vibration during the flight movement and it may lead to delamination and finally even flight crash can happen because of that. Any solid structure's vibration behaviour discloses specific dynamic characteristics and property parameters of that structure. This research investigates the detection of delamination in composites using a method based on vibration signals.  The composite material's flexural stiffness and strength are reduced as a result of delaminations, and vibration properties such as natural frequency responses are altered. In inverse problems involving vibration response, the response signals such as natural frequencies are utilized to find the location and magnitude of delaminations. For different delaminated beams with varying position and size, inverse approaches such as Response Surface Methodology (RSM) and Artificial Neural Network (ANN) are utilized to address the inverse problem, which aids in the prediction of delamination size and location.
Organisationen der postmigrantischen Gesellschaft
Authors: Klevermann Nils
Published: June 2022

Stand lange das Subjekt im Fokus des Integrationsdiskurses, nehmen vermehrt Migrant:innenOrganisationen eine zentrale Position im Kampf um die Deutungsmacht dieses Übergangs ein. Vor diesem Hintergrund analysiert die Studie die Bedingungen, unter denen Kollektive in einer postmigrantischen Gesellschaft soziale Existenz und Handlungsfähigkeit erlangen. Sie geht der Frage nach, wie Migrant:innenOrganisationen integrationspolitisch adressiert werden und wie sie sich zu diesen Vereinnahmungen positionieren. Mit ihren Erkenntnissen leistet die Arbeit einen Beitrag zur diskriminierungs- und rassismuskritischen Organisationsforschung.
Ascorbic Acid Therapy in Hematological Malignancies - The Current Knowledge and Future Directions
Authors: Lam Wing Kit , Ha Chung Yin , Yip Sze Fai
Published: June 2022

Ascorbic acid (AA) therapy in cancer treatment has been highly controversial. Despite the lack of high-quality evidence of its efficacy, complementary or alternative medicine practitioners and physicians have used high-dose intravenous AA (IVAA) therapies for cancer or palliative treatment. AA, which was once out of favor in cancer therapy, is being intensely studied due to more knowledge on the pharmacokinetics properties and anti-cancer effects demonstrated in preclinical studies. On the other hand, there has been more understanding of the pathogenesis of hematological malignancies with next-generation sequencing. There is an increasing number of potential targets for therapies, with AA also being one of the candidates that showed examples of success. The potential of AA therapy in both oral and intravenous formulations in hematological malignancies is reviewed in this article to help identify the current knowledge, the unresolved questions, and future research directions.
Pengelompokan Data Barang Dengan Menggunakan Metode K-Means Untuk Menentukan Stok Persediaan Barang
Authors: Ika Anikah  , Agus Surip  , Nela Puji Rahayu  , Muhammad Harun Al- Musa  , Edi Tohidi
Published: June 2022

Pada era globalisasi, teknologi semakin berkembang dengan cepat. Perkembangan teknologi di dunia banyak membantu manusia memudahkan pekerjaanya agar lebih efektif dan efisian di berbagai bidang. Salah satu teknologi yang dapat digunakan pada bidang industri yaitu memudahkan pekerjaan dalam melakukan pengendalian persediaan. Permasalahan yang dihadapi oleh PT. SAS Group yaitu berkaitan dengan ketersediaan barang yang merupakan suatu elemen yang sangat penting, sehingga sebagai manajemen yang baik dalam proses mengatur ketersediaan stok barang sangat diperlukan, untuk menghindari penumpukan barang yang sama dan barang yang kurang diminati oleh pembeli dengan menggunakan data mining. Metode clustering yang digunakan yaitu metode K-Means. Tahapan penelitian yaitu identifikasi masalah, studi literatur, pengumpulan data, pemprosesan data, data mining dan evaluasi. Tujuan dari penelitian ini adalah memudahkan PT. SAS Group dalam menentukan stok persediaan barang.Hasil dari penelitian ini yaitu setiap cluster yaitu cluster_0 sebanyak 1282 atau sebesar 98,6%, cluster_1 sebanyak 18 atau sebesar 1,4%. Berdasarkan hal tersebut didapat kelompok stok barang yang berada pada cluster_0 memiliki rata-rata penjualan yang besar yaitu mencapai 2368 barang. Artinya bahwa kelompok barang pada cluster_0 perlu menyimpan banyak barang karena merupakan produk yang paling banyak diminati.
OPTIMIZING THE ROLE OF LEADERSHIP AND STRENGTHENING WORK SPIRIT AS AN EFFORT TO INCREASE QUALITY WORK OUTCOMES
Authors: Oktavia Sheli
Published: June 2022

Quality of work is one of the main instruments that show the achievement of performance. For companies, performance is a necessity, which must be realized, as evidence of achieving goals. Therefore, it takes the involvement of all parties, especially the leadership. Leaders have an important role in influencing and inviting all employees to work totally in realizing company goals. In addition, the inherent optimism and enthusiasm is a supporting factor for improving performance. In this regard, this study aims to analyze and explain the possible influence of leadership and work motivation on improving performance. Methodologically, this research is quantitative based using multiple linear regression statistics. In collecting data, a questionnaire method was used, so that the answer scale was obtained. The results showed that the partial and simultaneous statistical results were in the significant category. That is, a good leader can encourage the creation of a productive work environment, an environment that breeds enthusiasm for work, and has a strong desire to give the best results. Likewise, work motivation has a real influence on the psychological state of employees, namely a self-motivation to be able to contribute to the interests of the company.Keywords: Work Quality, Work Spirit, Leadership Role
A védett természeti területek helyzete a vízgazdálkodási nagylétesítmények fenntartásában
Authors: Katona Gábor
Published: June 2022

Hazánkban gyakran tapasztalható a természetvédelem és a vízgazdálkodási érdekek ütközése, amelynek oka főként országunk  adottságaiban, méretében, illetve a közelmúlt  történelmében keresendő. A cikkben a szerző a  természetvédelem és a vízgazdálkodási  tevékenységek  átfedései mentén értékeli a Tisza-tó  mint védett természeti  terület vízgazdálkodási  szempontú rekonstrukciós munkáit. Bemutatja a  természetvédelem nemzetközi és hazai  kialakulását,  valamint kitér a Tisza-tó mint mesterséges létesítmény védett természeti területté nyilvánítására.  Értékeli a beruházás keretében  végzett rekonstrukciós  munkák hatását a tó  élővilágára, és megállapításokat tesz a vízgazdálkodási és természetvédelmi kezelők  lehetséges együttműködésének formáira.
BİLİMSEL YÖNETİM PARADİGMASININ GÖRÜNMEYEN YÜZÜ: KADIN TEORİSYENLER VE SOSYAL & ENTELEKTÜEL AĞLARI ÜZERİNE ELEŞTİREL BİR OKUMA
Authors: ŞENER Emine , BULUT Özlem , BARAN Selma
Published: June 2022

Bu çalışmanın amacı, bilimsel yönetim paradigmasının “görünmeyen yüzü” kadın teorisyenlerin yönetim alanına katkılarını ve sosyal/entelektüel ilişkilerini ortaya çıkarmaktır. Bu çalışmada, bilimsel yönetim paradigmasında rol oynayan kadın teorisyenler (Lillian Gilbreth, Mary Van Kleeck, Katherine H.M. Blackford, Mary Barnett Gilson) hakkında literatür taraması yapılarak ilgili paradigmaya karşı tutumları sunulmuş ve ortak bağlantıları çözümlenmeye çalışılmıştır. Araştırmanın temel amacı esas alınarak bilimsel yönetim paradigmasının görünmeyen yüzü kadın teorisyenlerin tanımlayıcı nitelikleri sosyal ağ analizi ile sosyal varlıkları arasındaki ilişki ve bu ilişki modelleri oluşturulmuştur. Teorisyenlerin birbirleriyle ve Taylorizm, Sosyal Darwinizm, Sosyal İlerlemecilik ve Feminizm ile bağlantıları NodeXL Graph Uygulaması ile sosyal ağ ve matrisle ortaya konulmuştur. Kadın teorisyenlerin birbirleriyle ve Taylor ile ilişkili olduğu tespit edilmiştir. Sosyal Darwinizm ile doğrudan ilişkili olan üç teorisyen (Lillian Gilbreth, Mary V. Kleeck, Katherine H. M. Blackford) belirlenmiştir. Araştırma sonucu doğrultusunda, bilimsel yönetim paradigmasının ve içinde bulunulan çağın sosyal, ekonomik, siyasal koşullarının Sosyal İlerlemecilik ve Sosyal Darwinizm etkisi altında olduğu tespit edilmiştir.
Okul Öncesi Dönem Çocuklarının Küresel Isınma Hakkındaki Düşüncelerinin İncelenmesi
Authors: ÖZYÜREK Ebru , GÜNDOĞDU Serhat
Published: June 2022

Bu araştırma 4-6 yaş arası okul öncesi dönem çocuklarının küresel ısınma hakkındaki düşüncelerini belirlemek amacıyla gerçekleştirilmiştir. Araştırmada nitel araştırma desenlerinden fenomonoloji deseni kullanılmıştır. Araştırmanın çalışma grubunu okul öncesi eğitime devam eden 4-6 yaş arası 25 çocuk oluşturmaktadır. Araştırmanın verileri yarı yapılandırılmış görüşme sorularından oluşan görüşme formu ve çocukların çizimleri ile toplanmıştır. Elde edilen veriler içerik analizi tekniği kullanılarak analiz edilmiştir. Araştırmanın bulgularına göre, çocuklar küresel ısınmanın nedenleri arasında kaynakların bilinçsiz kullanımı ve hava kirliliği gibi insan kaynaklı nedenleri daha çok vurgulamışlardır. Bununla birlikte küresel ısınmanın nedenlerinin doğal kaynaklı olduğunu ifade edenler de olmuştur. Çocuklar, küresel ısınmanın sonuçlarını olumsuz olarak değerlendirmişler ve daha çok canlılar üzerindeki olumsuzluklara değinmişlerdir. Çocuklara göre küresel ısınma en çok hayvanlar üzerinde olumsuz etkiye sahiptir. Ayrıca insanlar ve bitkiler de küresel ısınmadan zarar gören canlılardır. Daha az sayıda çocuk küresel ısınmanın çevreye zararlarını ifade etmişlerdir. Çocukların küresel ısınmanın önlenmesine yönelik önerilerinde su tasarrufu, elektrik tasarrufu ve kömür/odun kullanımının sınırlandırılması gibi bilinçli kaynak kullanımına yönelik önerileri daha çok ifade ettikleri ortaya çıkmıştır. Çocuklar ayrıca çevreyi korumaya yönelik önerilerde de bulunmuşlardır. Sonuç olarak çocukların küresel ısınma konusunda mantıklı düşüncelerinin olduğu görülmüştür. Araştırmanın bulguları tartışılmış ve önerilerde bulunulmuştur.