bluuebunny/crossref_metadata_2025 huggingface dataset:
Investigation of the Existence of Limit Cycles in Multi Variable Nonlinear Systems with Special Attention to 3X3 Systems
Authors: Patra Kartik Chandra , Patnaik Asutosh
Published: July 2023

The proposed work addresses the dynamics of a general system and explores the existence of limit cycles (LC) in multi-variable Non-linear systems with special attention to 3x3 nonlinear systems. It presents a simple, systematic analytical procedure as well as a graphical technique that uses geometric tools and computer graphics for the prediction of limit cycling oscillations in three-dimensional systems having both explicit and implicit nonlinear functions. The developed graphical method uses the harmonic balance/harmonic linearization for simplicity of discussion which provides a clear and lucid understanding of the problem and considers all constraints, especially the simultaneous intersection of two straight lines & one circle for determination of limit cycling conditions. The method of analysis is made simpler by assuming the whole system exhibits the limit cycling oscillations predominantly at a single frequency. The discussions made either analytically/graphically are substantiated by digital simulation by a developed program as well as by the use of the SIMULINK Toolbox of MATLAB Software.
The effect of dark states on the intersystem crossing and thermally activated delayed fluorescence of naphthalimide-phenothiazine dyads
Authors: Cao Liyuan , Liu Xi , Zhang Xue , Zhao Jianzhang , Yu Fabiao , Wan Yan
Published: July 2023

A series of 1,8-naphthalimide (NI)-phenothiazine (PTZ) electron donor–acceptor dyads were prepared to study the thermally activated delayed fluorescence (TADF) properties of the dyads, from a point of view of detection of the various transient species. The photophysical properties of the dyads were tuned by changing the electron-donating and the electron-withdrawing capability of the PTZ and NI moieties, respectively, by oxidation of the PTZ unit, or by using different aryl substituents attached to the NI unit. This tuning effect was manifested in the UV–vis absorption and fluorescence emission spectra, e.g., in the change of the charge transfer absorption bands. TADF was observed for the dyads containing the native PTZ unit, and the prompt and delayed fluorescence lifetimes changed with different aryl substituents on the imide part. In polar solvents, no TADF was observed. For the dyads with the PTZ unit oxidized, no TADF was observed as well. Femtosecond transient absorption spectra showed that the charge separation takes ca. 0.6 ps, and admixtures of locally excited (3LE) state and charge separated (1CS/3CS) states formed (in n-hexane). The subsequent charge recombination from the 1CS state takes ca. 7.92 ns. Upon oxidation of the PTZ unit, the beginning of charge separation is at 178 fs and formation of 3LE state takes 4.53 ns. Nanosecond transient absorption (ns-TA) spectra showed that both 3CS and 3LE states were observed for the dyads showing TADF, whereas only 3LE or 3CS states were observed for the systems lacking TADF. This is a rare but unambiguous experimental evidence that the spin–vibronic coupling of 3CS/3LE states is crucial for TADF. Without the mediating effect of the 3LE state, no TADF is resulted, even if the long-lived 3CS state is populated (lifetime τCS ≈ 140 ns). This experimental result confirms the 3CS → 1CS reverse intersystem crossing (rISC) is slow, without coupling with an approximate 3LE state. These studies are useful for an in-depth understanding of the photophysical mechanisms of the TADF emitters, as well as for molecular structure design of new electron donor–acceptor TADF emitters.
Language ideology in monologues of two Barayin speakers
Authors:   SOAS University of London, Lovestrand Joseph
Published: July 2023

This paper compares the language ideologies expressed in two monologues from speakers of Barayin, a Chadic language spoken by about 6000 people in the Guera region of Chad. Both speakers express an essentialist conceptualization of their language in which an authentic use of the language is linked to ethnic identity. However, one speaker rejects the need for literacy in Barayin, while the other argues for literacy to help the younger generation maintain their vital link to the language.
Using Indigenous Language in Telecom Advertisements: Communicative Effects of Cigogo in TTCL 4G Launch Campaign in Tanzania
Authors:   Higher School of Economics University, Beletskiy Stanislav
Published: July 2023

In 2017, TTCL, one of the leading providers of telecommunication services in Tanzania, launched an unusual advertising campaign. Its content was culturally and linguistically localised targeting large ethnic groups of Tanzania (the Wasukuma, Wagogo, Wanyakyusa, Waluguru people). Billboards were placed in major cities where these ethnic groups are found. The billboards showed traditional and modern-day activities typical for the regions, accompanied by greetings in the respective indigenous languages. In this way, TTCL planned to create an awareness of their services, to acquire new customers, and to link the use of their services and patriotic feelings. This study analyses the ways 48 Wagogo persons decoded the information from the billboards found across the capital city, Dodoma, and interpreted the intended message. It measures the effectiveness of the advertisement and estimates the effects that the use of Cigogo had on native speakers. The methods used are a questionnaire and a semi-structured interview with subsequent statistical analyses of the data (1-sample proportion test with continuity correction and Pearson’s chi-squared test).
Les marchands français de Cadix et la crise de la Carrera de Indias (1778-1828)
Authors: Bartolomei Arnaud
Published: July 2023

Comment les acteurs économiques se déterminent-ils face aux choix cruciaux qu’ils sont amenés à faire au cours de leur existence ? Sont-ils guidés par le seul « goût du lucre » ? Ou par des calculs plus complexes, prenant en compte leur environnement social, familial et culturel ? Cette question ancienne, mais toujours d’actualité, aussi bien au sein des sciences sociales que dans le débat public, est abordée ici à partir de l’observatoire singulier des quelque 500 marchands français qui s’étaient installés à Cadix au xviiie siècle pour bénéficier des conditions commerciales exceptionnelles qu’offrait alors le grand port andalou de la Carrera de Indias - la mythique route du commerce colonial espagnol et des « fabuleux métaux ». À travers l’histoire de leurs trajectoires dans les temps troublés des guerres révolutionnaires, de l’épopée napoléonienne et de l’émancipation des colonies espagnoles, c’est à une plongée au cœur des logiques de décision des acteurs que nous invite l’auteur.
CFD Based Aerodynamic Design of Helicopter Tail Boom for Hover and Sideward Flight Performance Enhancement
Authors:   Turkish Aerospace, Ezerta Alper , Can Baris , Güngör Osman , Ortakaya Yüksel
Published: July 2023

Aerodynamic shape design of the helicopter tail boom is aimed for anti-torque power requirement alleviation at hover and improvements on sideward flight characteristics. Oval type basic tail boom cross section, whose camber can be modifiable with organic shaped strakes, is proposed to supersede conventional symmetrical tail boom profiles. Performance of several contour shapes is investigated with systematically varying the position and alignment of the strakes through the 2-D RANS simulations. Cross-section shapes that shows highest potential are utilized on tail boom design and to evaluate the resulting hover performance, 3-D CFD analyses are conducted with both of RANS simulations using the actuator disk approach and URANS solutions where blade motions are modeled with overset method. The assessment of the design concept outlined that, utilizing proper design decisions on position, size and alignment of the strake shapes on properly designed oval type cross section, it may be possible to reduce significant amount of power requirement on hover while enhancing the lateral controllability margins at sideward flight or hover at cross wind conditions.
The Evaluation of Composite Energy Absorbers for use in UAM VTOL Vehicle Impact Attenuation
Authors:   NASA Langley Research Center, Littell Justin , Putnam Jacob , Hardy Robin
Published: July 2023

The demand for new personal air-taxi services is leading to the development of lightweight Vertical Take-off and Landing (eVTOL) vehicles with electric propulsion for the Urban Air Mobility (UAM) industry. Manufacturers (OEMs) are considering many different designs to develop a vehicle that is able to take-off, cruise, and land autonomously with seating arrangements ranging between 2 and 15 passengers. It is unclear at present how the eventual market will mature; however, one of the common design characteristics noted by many of the OEMs is the use of advanced materials such as composites. A test and analysis program was initiated at NASA Langley Research Center (LaRC) in 2018 to evaluate the impact attenuation capabilities of various composite material systems with the goal of eventual implementation into an eVTOL vehicle. A series of 3-inch diameter by 6-inch length tubular specimens were fabricated from different material systems which included both traditional carbon and hybrid woven layers of fibers. Additionally, a subset of specimens were filled with closed-cell polyisocyanurate foam to help both with stabilization and crush response. The ultimate goal of the test program was to design a specimen capable of limiting the sustained crush acceleration to 20 g through a stable crush progression. After a series of material tests, these specimens were evaluated under both static and dynamic conditions for impact energy attenuation characteristics and crush stability. Additionally, a series of simulation models were developed in parallel to the test efforts. It is anticipated that the models developed using the component level test efforts can be used to help guide the development of a design for use in full-scale eVTOL vehicle applications.
A Strategy for Determining Optimal Crewing in Future Vertical Lift: Human-Automation Function Allocation
Authors:   Applied Decision Science LLC, Ernst Katie ,   Roth Cognitive Engineering, Roth Emilie ,   HF Designworks Inc., Scheff Scott ,   Marimo Consulting, Klein Devorah ,   US Army CCDC, Taylor Grant , Militello Laura , Sushereba Christen , DiIulio Julie , Wonderly Scott
Published: July 2023

The U.S. Army's Future Vertical Lift Optimally Crewed Vehicle program is developing and exercising a strategy for determining crewing that facilitates human-machine teaming by supporting human expertise, leveraging sophisticated automation, and facilitating the joint cognitive team. Traditional approaches to function allocation have resulted in systems that capitalize on the strengths of automation but not the strengths of humans, exhibit brittleness during off nominal events, and underestimate the amount of work necessary to manage automation. The new strategy developed for this program, based on an extensive literature review, incorporates methods from cognitive task analysis, cognitive work analysis, and human performance modeling/simulation into the following five activities: (1) analyzing function allocation tradespace; (2) analyzing operational demands and work requirements; (3) analyzing interdependencies between human and automation; (4) evaluating alternative options with human performance modeling/ simulation; (5) identifying and evaluating alternative function allocation and crewing options. The activities are described with excerpts of associated products.
Adaptive, Parallel Discretization of Periodic Systems
Authors:   Naval Surface Warfare Center, Milgram Judah
Published: July 2023

Periodic systems arise in rotorcraft analysis as well as many other technical areas. Solutions to the periodic response based on time integration of the equations of motion have certain advantages at the potential cost of considerable computational expense and lack of certainty in obtaining a periodic response. Enforced-periodicity methods such as harmonic balance and time discretization guarantee a periodic solution without the need for time integration over an indefinite interval. Time discretization offers the possibility of computational efficiency through tuning the temporal mesh to match features in the response. An adaptive time-discretization method for solving the response of periodic systems was implemented using an object-oriented scripting language. The time elements may be refined based on computed error measures. The method is demonstrated for two simple test cases.
Adaptive Frahm for Variable-Speed Rotor Helicopters
Authors:   ITT Enidine Inc., Ott Mark
Published: July 2023

The focus of this paper reports on the technology developed for an adaptive Frahm. The aim was to have a Frahm system adapt its behavior to attenuate vibrations at two specific frequencies representative of 100% rotor rpm and 90% rotor rpm. An approximate quarter scale mass system was designed to test and develop the controlling algorithm. The performance of the Frahm was tuned by moving a mass along a pendulum beam. Higher frequencies moved the mass closer to the pivot point while lower frequencies moved the mass away from the pivot point. Test results showed the ability to achieve an average of 70% attenuation for both frequencies of interest. Opportunities exist to improve the performance by reducing the friction damping at the pivot hinge, but this comes with the need for higher frequency resolution and possibly slower response times.
Experimental and Analytical Validation of Rotor Components Static Substantiation Process
Authors:   Leonardo Helicopters, Cuffiani Davide , Petri Fabrizio , Ferro Piergiorgio
Published: July 2023

This paper reports an overview of the experimental and analytical activities carried out in relation to the identification of the more severe limit load conditions for the AW169 Main Rotor components, with particular attention to the Main Rotor Tension Link. The entire interdisciplinary process involving the set up as well as the validation of the aeroelastic software used, the setup of the validated FE Model of the Tension Link related to both the helicopter installation and the Test Rig, the definition of the criterion used to select the more severe limit conditions will be extensively described. Particularly, the definition of a simple criterion able to restrict the number and the typologies of conditions to be simulated proved to be very useful in reducing the computational time involved in the simulation of several dozen conditions. The approach described here, although related to a specific part with specific characteristics, can be generalized to any other complex part loaded by multiple forces and tested in a Test Rig which, due to implementation constraints, cannot fully represent the real helicopter installation.
Propose an Optimum Stocks Portfolio Using Markowitz Modern Portfolio Theory in Educational Endowment Fund Management (Case Study of XYZ Institution)
Authors:   School of Business and Management, Bandung Institute of Technology, Indonesia, Prasetyo Jonathan Hardi , Sudrajad Oktofa Yudha ,   School of Business and Management, Bandung Institute of Technology, Indonesia
Published: July 2023

XYZ institution is a Public Service Agency in Educational Sector, focused on giving the scholarship in master and doctoral programs level domestically and abroad, also in many affiliated researchers funding programs. The effect of granting scholarships and research funding produces an extraordinary output for the country. It was successfully increased the quality level of education in Indonesian society, also with the Indonesian Human Development Index. With a great accumulated amount of asset under management in fiscal year 2023, XYZ institution have a really big opportunity to maximize the investment return and give all Indonesia’s citizens an equal chance of pursuing the higher education. Markowitz Modern Portfolio Theory (MPT) is utilized to construct an optimal stocks portfolio for XYZ institution. The proposed stocks portfolio seeks to find a combination between high-growth stocks that have the potential to increase in value and stable dividend-paying stocks that provide income stability. The goal is to maximize the overall investment portfolio returns while taking its risk tolerance and investing objectives into consideration. Diversification was done by investing in a diverse range of companies across sectors and asset classes, reducing exposure to single asset risk. The proposed optimum investment portfolio provides XYZ institution a diversified allocation of assets, consisting of a portion in Time Deposits at 36,68%, Government Bonds at 34,10%, Corporate Bonds at 27,21%, and Stocks at 2%, which is constructed in a form of Aggressive Strategy, Moderate Strategy, and Defensive Strategy. The stocks selection resulting the best five stocks composition in Moderate Strategy which consist of BBNI at 20,17%, BJBR at 19,54%, PTBA at 20,15%, ADRO at 19,67%, and INDF at 20,47%, projected could give a return contribution at 6,60% with the lowest given risk of 26,83% from the stocks portfolio and could generate a 7,15% to the overall investment portfolio return.
Revolutionizing Healthcare: How Deep Learning is poised to Change the Landscape of Medical Diagnosis and Treatment
Authors: Ahmad Ahsan , Tariq Aftab , Hussain Hafiz Khawar , Yousaf Gill Ahmad
Published: July 2023

Deep learning has become a significant tool in the healthcare industry with the potential to change the way care is provided and enhance patient outcomes. With a focus on personalised medicine, ethical issues and problems, future directions and opportunities, real-world case studies, and data privacy and security, this review article investigates the existing and potential applications of deep learning in healthcare. Deep learning in personalised medicine holds enormous promise for improving patient care by enabling more precise diagnoses and individualised treatment approaches. But it's important to take into account ethical issues like data privacy and the possibility of bias in algorithms. Deep learning in healthcare will likely be used more in the future to manage population health, prevent disease, and improve access to care for underprivileged groups of people. Case studies give specific examples of how deep learning is already changing the healthcare industry, from discovering rare diseases to forecasting patient outcomes. To fully realize the potential of deep learning in healthcare, however, issues including data quality, interpretability, and legal barriers must be resolved. Remote monitoring and telemedicine are two promising areas where deep learning is lowering healthcare expenses and enhancing access to care. Deep learning algorithms can be used to analyse patient data in real-time, warning medical professionals of possible problems before they worsen and allowing for online discussions with experts. Finally, when applying deep learning to healthcare, the importance of data security and privacy cannot be understated. To preserve patient data and guarantee its responsible usage, the appropriate safeguards and rules must be implemented. Deep learning has the ability to transform the healthcare industry by delivering more individualised, practical, and efficient care. However, in order to fully realize its promise, ethical issues, difficulties, and regulatory barriers must be solved. Deep learning has the potential to significantly contribute to enhancing patient outcomes and lowering healthcare costs with the right safeguards and ongoing innovation
Nachfrageeinbruch belastet Hagebau
Authors: Hofmann Janine
Published: July 2023

Hagebau macht ein zweistelliger Umsatzrückgang zu schaffen. Vor allem die Fachmarktsparte kämpft mit der sinkenden Nachfrage. Für das Gesamtjahr erwartet die Gruppe ebenfalls schrumpfende Erlöse.
Some thoughts about eclogites and related rocks
Authors: Brown Michael
Published: July 2023

Abstract. The past 40 years have been a golden age for eclogite studies, supported by an ever wider range of instrumentation and enhanced computational capabilities, linked with ongoing developments in thermobarometry and geochronology. During this time, we have made robust estimates of pressure–temperature (P–T) conditions; determined ages related to the prograde, metamorphic peak and retrograde stages; and calculated time-integrated rates of cooling and exhumation for eclogites and related rocks, including blueschists, from orogenic belts worldwide. Improvements to single mineral thermometers and new developments in elastic barometry using inclusions of one mineral in another (e.g. quartz and/or zircon in garnet), coupled with ongoing innovations in petrochronology and diffusion modelling, presage a new age for eclogite studies in which detailed quantification of metamorphic conditions and timescales will be linked to an improved understanding of processes at all scales. Since the turn of the century, numerical modelling of subduction zone and rock exhumation processes has become increasingly important. As a result, subduction and exhumation are quite well understood, but the volume of continental crust subducted to and returned from mantle conditions and the amount lost to the mantle are largely unknown. We have generated sufficient data to investigate the spatiotemporal distribution of metamorphism and secular change but not without controversy in relation to the rare occurrence of orogenic eclogites and the absence of blueschists prior to the late Neoproterozoic and the emergence of plate tectonics on Earth. Since the turn of the century, the assumption that metamorphic pressure is lithostatic has come under increasing scrutiny. Whether local variations in stress extrapolate to the crustal scale and, if so, whether the magnitude of the calculated deviations from lithostatic pressure can be generated and sustained in mechanically heterogeneous rock units remains contentious. Could the paradigm of subduction of continental lithosphere to mantle depths be simply an artefact of the lithostatic assumption? Fluid cycling in subduction zones and understanding the role of fluids in the generation of intermediate-depth earthquakes remain important topics of current research. Dry (H2O-absent) conditions are unlikely around the peak of ultrahigh-pressure (UHP) metamorphism or during exhumation, due to dehydroxylation of nominally anhydrous minerals and breakdown of hydrous minerals at P–T conditions in the realm of supercritical fluid and hydrous melt. Indeed, the presence of melt may be necessary to facilitate the exhumation of HP and UHP tectonometamorphic rock units. Finally, our ability to interrogate inclusions in superdeep diamonds should lead to a better understanding of how the deep interior and surface are linked in the context of Earth as a fully coupled system.
Safety in Senhance™ Robotic Gastrointestinal Surgery in 530 Patients
Authors:   Department of General and Visceral Surgery, Klinikum Esslingen, Esslingen, Germany, Staib Ludger , Poth Clemens ,   Department of General and Visceral Surgery, Klinikum Esslingen, Esslingen, Germany, Schilcher Florian ,   Department of General and Visceral Surgery, Klinikum Esslingen, Esslingen, Germany, Hansen Olaf ,   Department of General, Visceral, and Oncologic Surgery, Evangelisches Krankenhaus, Wesel, Germany, Menke Vivianda ,   Department of General, Visceral, and Oncologic Surgery, Evangelisches Krankenhaus, Wesel, Germany, Stephan Dietmar ,   Minimally Invasive and Robotic Surgery, St.-Marien-Krankenhaus, Siegen, Germany, Willeke Frank ,   Clinic for General and Visceral Surgery, St.- Marien-Krankenhaus, Siegen, Germany
Published: July 2023

The Senhance Robotic System™ (Asensus Surgical, Durham, NC, USA) has been used in abdominal surgery since 2016, and provides an eye-tracker for camera movement and haptic tactile feedback. Safety aspects are very important in robotic surgery, such as regarding the presence of system malfunctions and surgical outcomes. The data for robotic function in gastrointestinal surgical procedures in 530 patients (colorectal surgery, fundoplication, others) were prospectively listed in the TRUST registry after informed patient consent in three German gastrointestinal surgery centers (center A, N = 46 patients; center B, N = 457; center C, N =27). Adverse events were noted in 14.3% (76/530 patients) of the overall surgeries, with an equal distribution among the procedures. Robotic malfunctions, such as console/camera/arm malfunctions, collisions, or limited motion, were experienced in 5.5 % (29/530 patients), with some differences among the centers (A, 0.0%; B, 4.2%; C, 37%). These differences were explained in terms of team experience and case load. In conclusion, the Senhance™ Robotic System can be safely applied to routine abdominal surgery procedures.
Human resources management - labor crisis
Authors: Ladaru Raluca Georgiana , Burlacu Sorin , Guţu Corneliu , Platagea Gombos Svetlana
Published: July 2023

The labor force is important in terms of the results obtained in the national economy. In general terms, labor, according to the theories of some economists, is a major factor in production. Along with the capital and financial-material resources, the work comes to complete, from a factorial point of view, the conditions for obtaining the best possible production. The labor force must be interpreted as part of the employed population, which operates on the basis of an employment contract. In the concrete situation of Romania, the number of employees is completed with the number of unemployed who together constitute the employed population in Romania. As a rule, the labor force must be recruited from the unemployed population, the population that is made up of the unemployed or is the active population, without fulfilling the conditions to pass into the category of the employed population. In this context, the territorial employment offices pursue persons registered as unemployed, who are thus considered or as a jobseeker. Labor market rigidity is becoming an increasingly important issue in the wake of the shocks associated with economic crises. The labor market has faced major changes in the context of the economic transition process, manifested by the reduction of the active and employed population, maintaining the unemployment rate at constant values. The labor market is generally affected by the limited capacity to create new jobs. This paper involved identifying issues related to the labor crisis, both globally and in Romania.
The GIG Economy – Result of the Labour Market Platformization
Authors: Bucos Tatiana
Published: July 2023

The platformization of the economy, a term that recently appeared in economic theory as a result of the trend to optimize business processes through the development of digital platforms, has induced major changes in economic processes and systems, affecting all economic spheres, including the labour market. The trends of platformization of the labour market have transformed the Gig phenomenon, which refers to short-term work relationships, per project, into a large-scale trend, which includes an increasing number of specialists available to provide their services on this market. The article aims to analyze the premises that led to the development of the Gig economy, but also the impact that the Gig economy has on the players on this market. Particular attention in the article is given to the types of platforms that mediate Gig work relationships, but also the analysis of factual materials that confirm the importance of this phenomenon, respectively the need to carry out research in the field.
Covid-19 influences on patients with bipolar disorder
Authors: Wang Qianrui
Published: July 2023

The covid-19 already exists for 3 years. People have suffered a lot during these years not only physically, but also mentally. The pandemic caused a rigorous environment for citizens by bringing some difficulties, such as unemployment. People are having more and more pressure that they cannot deal with. Thus, there should be a feasible solution to help people prevent and cure mental harm from the pandemic. Bipolar disorder is one of the mental disorders that could be caused by pressure, so the policy and effect of the pandemic might become the cause of it. This paper aims to explore how the Covid-19 have affected patients with bipolar disorder. The findings revealed that Covid-19 cuts down on therapies and cause more mental pressure for patients with bipolar disorder. There will be ways to prevent and solve these problems. People should learn to balance their feelings and ignore the negative sounds from outside. When there are too much pressure people can take, they could take some psychotherapy and find ways to release the burden.
Virtual reality simulation enabling high level immersion in undergraduate nursing education: A systematic review
Authors: Pernica Katrin , Virtanen Heli , Lunddahl Bager Ida , Jordan Fionnuala , Dütthorn Nadin , Stolt Minna
Published: July 2023

Background and objectives: Virtual reality simulation (VRS) can be used to complement experiential learning, as it enables nursing students to further learn and refine nursing skills outside of the clinical setting. However, gathering evidence for its effectiveness as a teaching method in achieving learning outcomes is still ongoing, and thus there is a lack of systematic synthesis. The objective of this systematic literature review is to analyze VRS scenarios with a high level of immersion and their impact on learning outcomes in nursing education.Methods: A literature search was performed in the MEDLINE, CINAHL, and ERIC databases in November 2022. As a result, fifteen studies were included and analyzed using deductive content analysis.Results: The studies reported twelve different scenarios for virtual reality simulations with high levels of immersion, the focus of which was on acute critical care, broader nursing processes, neonatal and pediatric care, single nursing interventions, and observation of patients’ symptoms. The associated learning objectives were mainly achieved in the domains of cognition and psychomotor skills.Conclusions: There are several VRS scenarios that show potential for use in nursing education. The VRS scenarios are effective in improving learning outcomes, particularly those related to knowledge and skills. Overall, the supportive body of evidence gained through this review may help nurse educators in integrating virtual simulations in their curricula. In the future, nursing and adult learning theories should be given greater consideration, and the aspect of affective learning could be included in design and implementation. Moreover, future research could benefit from exploring the long-term effects of learning after using VRS with a high level of immersion to provide valuable evidence for developing VRS teaching methods in nursing.
Pretreatment total lymphocyte count as a prognostic factor of survival in patients with recurrent cervical cancer after definitive radiation-based therapy: a retrospective study
Authors: Thiangphak Ekasak , Leetanaporn Kittinun , Buhachat Rakchai
Published: July 2023

Objective This study evaluated the association between pretreatment total lymphocyte count (TLC) and overall survival (OS) in patients with recurrent cervical cancer.Methods We retrospectively reviewed 290 patients with recurrent cervical cancer with definite complete responses to either definitive radiotherapy or concurrent chemoradiotherapy between January 2009 and December 2022. The associations between pretreatment TLC and progression-free survival (PFS) and OS rates were evaluated.Results Ninety-three patients (32%) had a pretreatment TLC <1,000 cells/mm3. Patients with a pretreatment TLC <1,000 cells/mm3 had lower treatment response rates than their counterparts (P=0.045). The OS and PFS rates were significantly higher in patients with pretreatment TLC ≥1,000 cells/mm3 than in those with pretreatment TLC <1,000 cells/mm3 (10.74 vs. 3.89 months, P<0.0001; 8.32 vs. 4.97 months, P=0.042; respectively). Moreover, pretreatment TLC ≥1,000 cells/mm3 was identified as an independent prognostic factor for OS in both univariate analysis (hazard ratio [HR], 0.57; 95% conficence interval [CI], 0.44-0.74; P<0.001) and multivariate analysis (HR, 0.64; 95% CI, 0.47-0.86; P=0.003). However, TLC ≥1,000 cells/mm3 was identified as a prognostic factor for PFS only in univariate analysis (HR, 0.71; 95% CI, 0.51-0.99; P=0.043) but not in the multivariate analysis (HR, 0.81; 95% CI, 0.55-1.18; P=0.3).Conclusion Pretreatment TLC was associated with treatment response and was identified as an independent prognostic factor associated with the survival outcomes of patients with recurrent cervical cancer.
HARNESSING PSYCHOLOGICAL CAPITAL TO AUGMENT EMPLOYEE ENGAGEMENT IN THE MICRO-FINANCE SME SECTOR
Authors:   Manicaland State University of Applied Sciences, MUPARANGI Simbarashe , MAKUDZA Forbes ,   University of Zimbabwe
Published: July 2023

The study sought to establish the effect of psychological capital on employee engagement on small to medium scale micro finance institutions. Secondary objectives were developed using psychological capital constructs namely hope, self-efficacy and resilience. The study adopted a quantitative approach backed by positivist philosophy. A sample of 350 respondents was determined using the Yamane’s model. Stratified random sampling was adopted and data was collected using a structured questionnaire. The results of the study indicate that psychological capital has a significant effect on employee engagement. The study recommends that employee behavioral workshops, mentorship, ethical leadership and coaching programmes directed at developing psychological capital in SMEs.
THE IMPACT OF SUSTAINABLE REPORTING ON THE FINANCIAL PERFORMANCE OF ENERGY AND GAS COMPANIES LISTED ON THE BUCHAREST STOCK EXCHANGE. AN EMPIRICAL APPROACH
Authors:   Lucian Blaga University of Sibiu, MIHAI Claudia-Larisa
Published: July 2023

The financial performance of a company whose operating activity has a significant social impact on the environment is influenced by the sustainable reporting of these two indicators, for investors that manifest interest, whose orientation involves sustainable development, being a new economic concept. This research aims to highlight how sustainable reporting has a direct impact on an entity’s performance, by quantifying the environmental variable and the social variable in a scoring matrix, by assigning values based on the completeness of reporting the data found in the reports of 8 entities in the field of energy and the exploitation and transportation of natural gas and oil listed in category I on the Bucharest Stock Exchange, regarding the programs undertaken, the approvals obtained or the quality standards to which they aligned. The research results are based on correlation and regression econometric calculations to identify the correlations between the score variable and financial performance.
Tumors of the Ovary and Fallopian Tube
Authors: Carlson Joseph W. , Gilks C. Blake , Soslow Robert A.
Published: July 2023

The complexity of ovary and fallopian tube pathology is striking, with dozens of tumor types. There is a greater appreciation now of the importance of hereditary cancer syndromes in ovarian and tubal malignancies, as two common autosomal dominant hereditary cancer predisposition syndromes include carcinomas of ovary or fallopian tube. This book is organized following the structure and terminology of the World Health Organization (WHO) classification of Female Genital Tumors, 5th edition. It includes some new entities that have been described since that book’s publication in 2020 and provides detailed discussion of differential diagnosis, relevant ancillary tests, and strategies to approach diagnosis. In addition, discussions of the underlying biology of these tumors, as it relates to their diagnosis, are also presented. This fascicle provides an opportunity for deeper reading and quiet reflection about the progress that has been made in our understanding of tumors of the ovary since the previous landmark edition was published in 1998, as well as a respect for the numerous challenges that remain.
Revisión bibliográfica: Osteomielitis aguda: Un enemigo rápidamente destructivo
Authors: Gutiérrez Fernández Francine , Ramírez Perera Shelsy , Navarro Morales Daniel
Published: July 2023

La osteomielitis es una enfermedad infecciosa ósea rápidamente progresiva en ausencia de tratamiento, que produce destrucción, isquemia y necrosis del tejido óseo afectado. Se entiende como osteomielitis aguda aquella con duración menor de dos semanas. El agente etiológico más común aislado en esta entidad es el Staphylococcus aureus. Su vía de diseminación por excelencia en infantes es hematógena en el caso de los adultos, se ve relacionada a la inoculación directa o indirecta ya sea por traumatismo, cirugía ortopédica con o sin implante protésico o lesión de tejidos blandos. Entre sus estudios diagnósticos se destacan exámenes de laboratorio y de imagen que aportan información útil para orientar el abordaje. Su tratamiento puede optar la vía farmacológica con antibioticoterapia o bien en ocasiones es necesaria la intervención quirúrgica con técnicas de desbridamiento, En la actualidad es una enfermedad que aún continúan los esfuerzos por el manejo de esta patología.
Integrated Effect of Heavy Metal-Tolerant Rhizobacteria and Phosphorus on Maize Growth and Phosphorus Bioavailability in Contaminated Soil
Authors: Nawaz Aman , Tariq Muhammad , Khan Kamal , Haq Mauz Ul , Khan Hassan
Published: July 2023

Toxic metals significantly influence agricultural crop yields and adversely affect animals and humans. Hence, in the current study impact of different strains of phosphorus-solubilizing bacteria (PSB) and levels of phosphorus on the solubility of phosphorus and the stabilization of heavy metals in contaminated soil were studied in a greenhouse pot experiment in 2022. The PSB strains included Bacillus CUM6, Bacillus DUM7, and Bacillus PIS7. Phosphorus was applied at rates of 40, 60, and 80 kg P2O5 ha-1 using single superphosphate, with a basal dose of 120 kg N and 60 kg K2O ha-1. The experiment followed a randomized, two-factorial design. Maize plants (variety "Azam") were inoculated with the PSB strains. Consequently, combining Bacillus PIS7 with 80 kg P2O5 ha-1 significantly increased both fresh and dry maize biomass (35.33 and 24.56 g pot-1) compared to the control (unspiked soil). Phosphorus bioavailability (7.07 and 5.14 mg kg-1) significantly improved with 80 kg ha-1 phosphorus and Bacillus PIS7. Heavy metal concentrations in soil (Cd, Pb, Cr, and Ni) decreased significantly at 80 kg ha-1 phosphorus and Bacillus PIS7, and Cd concentrations in plants decreased to 3.31 mg kg-1 with Bacillus DUM7 and to 2.96, 0.42, and 1.33 mg kg-1 with Bacillus PIS7. The application of PSB strains and phosphorus fertilizer reduced heavy metal concentrations. Notably, 80 kg P2O5 ha-1 with Bacillus PIS7 showed the best performance. Phosphorus uptake increased significantly (0.106 mg pot-1), while heavy metal uptake (Cd, Pb, and Cr) decreased linearly with increasing phosphorus levels and PSB strains. Bacillus PIS7 with 80 kg P2O5 ha-1 had the lowest heavy metal translocation, doing better than the control and other PSB strains (Bacillus CUM6 and Bacillus DUM7). Soil characteristics indicated increased organic matter content (0.73%) and decreased pH (7.61) and electrical conductivity (0.17 dSm-1) with applied phosphorus and PSB strains, suggesting enhanced phosphorus bioavailability and reduced heavy metal concentrations. In conclusion, adding 80 kg P2O5 ha-1 with Bacillus PIS7 helps plants grow better when they are stressed by heavy metals and keeps Cd, Pb, Cr, and Ni stabilized in the soil.
Desain Media Pembelajaran Dasar Listrik Elektronika Kelas X TAV berbasis Augmented Reality di SMKN 2 Sibolga
Authors: Rosdandi Utami Br Siregar Anggi , Zakir Supratman , Sesmiarni Zulfani , Aprison Wedra
Published: July 2023

Penelitian ini di latar belakangi dari berbagai masalah yang penulis temukan seperti media pembelajaran di kelas X TAV yang masih menggunakan buku cetak dan banyak fasilitas yang tersedia belum cukup lengkap serta banyak yang rusak dan hilang. Belum adanya minat dari siswa untuk mengikuti mata pelajaran dasar listrik elektronika disebabkan guru masih menggunakan penjelasan manual. Menurut Latar belakang tersebut, tujuan adanya penelitian ini yaitu agar menghasilkan aplikasi desain media pembelajaran kelas X TAV berbasis Augmented Reality di SMKN 2 Sibolga yang Valid, Praktis, dan tentunya Efektif. Metode yang digunakan di dalam penelitian ini menggunakan metode Research and Development (R&D) dengan menggunakan Multimedia Development Life Cycle (MDLC) Versi Luther-Sutopo, yang terdiri dari enam tahap, yaitu tahap concept (pengkonsepan), tahap design (pendesainan), tahap Material Collecting (pengumpulan materi), tahap Assembly (pembuatan), tahap testing (pengujian) dan tahap distribution (pendistribusian). Dan Uji Produk yang digunakan dalam penelitian ini menggunakan uji validitas yang diberikan kepada 3 dosen ahli bidang, uji praktikalitas yang dilakukan oleh 2 guru studi mata pelajaran dasar listrik elektronika dan untuk Uji Efektifitas yang diberikan kepada 10 siswa di kelas X TAV di SMKN 2 Sibolga. Menurut hasil dari Uji Produk yang sudah dilaksanakan oleh penulis untuk uji validitas menghasilkan nilai rata-rata yaitu 0,94 yang telah dinyatakan valid, dan untuk Uji Praktikalitas menghasilkan nilai rata-rata yaitu 0,95 yang dinyatakan sangat tinggi dan untuk Uji Efektifitas menghasilkan nilai rata-rata yaitu 0,73 yang telah dinyatakan efektif.
Una contribució al càlcul de valors i vectors propis i a l'anàlisi de l'escalabilitat
Authors:   , Royo Vallés María Dolores
Published: July 2023

El càlcul de valors i vectors propis és un nucli computacional que forma part de diverses aplicacions de tipus científic i tècnic que requereixen una potència de càlcul molt gran. Aquestes aplicacions no poden resoldre's en sistemes monoprocessadors perquè aquests sistemes no proporcionen la potència de càlcul suficient per resoldre el problema amb un temps raonable. Una solució possible a aquest problema és la utilització de sistemes paral·lels.

El contingut d'aquest treball pot dividir-se en quatre parts ben diferenciades; en les tres primeres parts dels valors i vectors propis en sistemes multicomputadors amb diferents topologies: hipercub, malla i torus; en l'última part del treball es proposa una metodologia d'anàlisis de l'escalabilitat de sistemes paral·lels.

- En la primera part del treball es proposen un conjunt d'algorismes paral·lels per hipercubs: BR segmentat, alfa-optimal i Grau-4. Tots aquests algorismes es basen en l'algorisme Block Recursive proposat a [42]. Els nous algorismes proposats tenen la capacitat d'utilitzar de forma més eficient el potencial paral·lelisme de comunicacions que ofereix una arquitectura multiple-port amb els que s'aconsegueix una reducció del cost de la comunicació considerable respecte al cost de comunicació de l'algorisme original.

- En la segona part del treball es proposa un nou algorisme amb una topologia de comunicació en malla bidimensional (2D). Aquest algorimse l'hem anomenat algorisme 2D. Es veurà que aquest nou algorisme aconsegueix reduir el cost total considerablement respecte als algorismes que han estat proposats per altres autors per malles i torus.

- En la tercera part, s'estudia l'eficiència de l'algorisme BR-segmentat (algorisme amb una topologia de comunicació en hipercub proposat en la primera part de la tesi) un cop mapejat en un multicomputador amb una topologia en malla o en torus. A l'hora de realitzar el mapeig s'ha aplicat i ampliat una metodologia desenvolupada en el grup de treball que ens permet realitzar el mapeig de forma eficient i sistemàtic d'una topologia en hipercub a una topologia en malla o torus. El cost de la comunicació del nou algorisme es compara amb el cost de l'algorisme 2D proposat en la segona part del treball.

- Finalment, en l'última part d'aquest treball es proposa una metodologia d'anàlisi de l'escalabilitat de sistemes paral·lels orientada a l'usuari final del sistema. S'utilitza l'algorisme 2D mapejat en una línia per mostrar un exemple d'aplicació de la metodologia.
Business-driven resource allocation and management for data centres in cloud computing markets
Authors:   , Macías Lloret Mario
Published: July 2023

Cloud Computing markets arise as an efficient way to allocate resources for the execution of tasks and services within a set of geographically dispersed providers from different organisations. Client applications and service providers meet in a market and negotiate for the sales of services by means of the signature of a Service Level Agreement that contains the Quality of Service terms that the Cloud provider has to guarantee by managing properly its resources.
Current implementations of Cloud markets suffer from a lack of information flow between the negotiating agents, which sell the resources, and the resource managers that allocate the resources to fulfil the agreed Quality of Service. This thesis establishes an intermediate layer between the market agents and the resource managers. In consequence, agents can perform accurate negotiations by considering the status of the resources in their negotiation models, and providers can manage their resources considering both the performance and the business objectives. This thesis defines a set of policies for the negotiation and enforcement of Service Level Agreements. Such policies deal with different Business-Level Objectives: maximisation of the revenue, classification of clients, trust and reputation maximisation, and risk minimisation. This thesis demonstrates the effectiveness of such policies by means of fine-grained simulations.
A pricing model may be influenced by many parameters. The weight of such parameters within the final model is not always known, or it can change as the market environment evolves. This thesis models and evaluates how the providers can self-adapt to changing environments by means of genetic algorithms. Providers that rapidly adapt to changes in the environment achieve higher revenues than providers that do not.
Policies are usually conceived for the short term: they model the behaviour of the system by considering the current status and the expected immediate after their application. This thesis defines and evaluates a trust and reputation system that enforces providers to consider the impact of their decisions in the long term. The trust and reputation system expels providers and clients with dishonest behaviour, and providers that consider the impact of their reputation in their actions improve on the achievement of their Business-Level Objectives.
Finally, this thesis studies the risk as the effects of the uncertainty over the expected outcomes of cloud providers. The particularities of cloud appliances as a set of interconnected resources are studied, as well as how the risk is propagated through the linked nodes. Incorporating risk models helps providers differentiate Service Level Agreements according to their risk, take preventive actions in the focus of the risk, and pricing accordingly. Applying risk management raises the fulfilment rate of the Service-Level Agreements and increases the profit of the provider