bluuebunny/crossref_metadata_2025 huggingface dataset:
Pengembangan Umkm Dan Ekonomi Kreatif Di Kecamatan Kepanjenkidul Kota Blitar Melalui Seminar Legalitas Usaha, Digital Marketing Dan HAKI
Authors: Billah Mu’tasim , Majid Nurcholish , Maulana Mahesa Bachtiar , Jonet Arfad Syauqi Hikam Al , Wahyuningsih Munirotul , Pratama Gandhi Yoga , Murdani Galuh Deliana Putri , Agustiyani Desy Fitria
Published: December 2022

Kegiatan pengabdian pengembangan UMKM sebagai salah satu cara atau solusi untuk menaikkan daya beli masyarakat, yang pada akhirnya dapat menutupi dari situasi krisis ekonomi. Metode pelaksanaan yang digunakan yaitu dengan mengadakan seminar kewirausahaan dan ekonomi kreatif yang berjudul “ Urgensi Legalitas Usaha dan Pemasaran Berbasis Teknologi Bagi Pelaku UMKM ” yang dilaksanakan di Kantor Kecamatan Kepanjenkidul Kota Blitar.  Manfaat seminar kewirausahaan dan ekonomi kreatif  “Urgensi Legalitas Usaha dan Pemasaran Berbasis Teknologi Bagi Pelaku UMKM”  yaitu memberikan pembelajaran dan wawasan kepada UMKM mengenai Legalitas Usaha, Digital Marketing dan HAKI. Fokus utama pada program kerja ini yaitu Legalitas usaha, Digital Marketing dan HaKI. Legalitas sendiri merupakan perizinan berusaha yang di berikan kepada pelaku usaha untuk memulai dan menjalankan usaha dan/atau kegiatannya. Digital Marketing merupakan aktifitas suatu strategi usaha untuk mengembangkan peluang bisnis dengan cara melebarkan pasar untuk meningkatkan target penjualan. HaKI merupakan suatu upaya dalam melindungi suatu karya dengan Hak Cipta agar tidak adanya pesaing yang menggunakan karya kita demi memperoleh keuntungan.
Coordination and Team work Depth analysis of Employee Performance at PT. XYZ
Authors: Dulmukmin  , Elly Herawatye
Published: December 2022

This study aims to examine the effect of Coordination, Human Resource Development and Teamwork on Employee Performance at PT XYZ. To test these variables, researchers used employees of PT. XYZ as the object of research. The research was conducted using a survey method by distributing questionnaires to 93 employees at PT. XYZ In this study the author uses a quantitative The results of research on Coordination, Human Resource Development, and Teamwork indicate that it positively affects employee performance, which can be interpreted as the better/higher Coordination, Human Resource Development and Teamwork, the better/higher the performance of the company's employees
INFLUENCE OF ORGANIZATIONAL CULTURE, COMMITMENT AND WORK DISCIPLINE AND MOTIVATION TO PERFORMANCE OF EMPLOYEES IN ARJAWINANGUN HOSPITAL
Authors: Muhammad  , Ellin Herlina  , Erdiriyo
Published: December 2022

Purpose of the study — In order to realize an organizational culture that is suitable to be applied to an organization, it is necessary to have the support and participation of all members within the scope of the organization. Employees form an overall perception based on the characteristics of organizational culture which include innovation, stability, caring, result orientation, leader behavior, team orientation, these characteristics are found in the organization. Organizational commitment reflects how an individual identifies with the organization and is bound by its goals. Leaders are advised to improve performance in order to get a higher level of commitment.Research method—Quantitavie method, The population in this study were all employees of RSUD Arjawinangun, amounting to 848 employees. Sampling using the purposive sampling method which establishes certain considerations or criteria that must be met by the samples used in this study. In this study, a sample of 90 employees will be taken.Result— Organizational culture has a significant value of 0.046, organizational commitment has a significant value of 0.035, work discipline of 0.001, and motivation of 0.001 each of which is smaller than 0.05 so it can be concluded that organizational culture, organizational commitment, work discipline and work motivation has a significant influence on employee performance.Conclusion— The attitude of work discipline possessed by employees is very important for a company in order to realize the company's goals, therefore it takes awareness of members of the organization to comply with the rules that have been set. Work motivation can be said to be a driving force or encouragement that can trigger a sense of enthusiasm and is also able to change individual behavior to lead to better things. Work motivation includes efforts to encourage or encourage employees to work.
SYSTEMATIC WASTE MANAGEMENT FOR EMPOWERMENT OF AMBULU VILLAGE COMMUNITY
Authors: Amirudin  , Deviari Damalita
Published: December 2022

Waste is something that is always present in our daily lives. All the activities will inevitably result in the waste and so is going on in the village of Ambulu, District of Losari, Cirebon. The problem of this research is the process of waste management, which can’t be categorised as good because the process is done by discharge management is not in the appropriate place and dispoce it using the combustion process.

The purpose of this study was to determine the existing waste management system in the village of Ambulu, District of Losari,Cirebon. The method used on this research is a qualitative study design with observational descriptive. It conducted by field surveys, focus group discussions with participant, open inteviews, and literature study. Participants used in this study is representative of the Environment Agency, the village head, village councils, youth clubs and organizations in the village. The study states that waste management still in the unfavorable category, this is due to many factors : the lack of land for the contruction of temporary shelters, facilities and infrastructures are not good enough and the level of public awareness is still low about the importance to manage waste properly. The advice can be given is to socialize, to schedule regular clean up to clen the village and create a budget for land acquisition, which will be used for temporary shelter.
DAMPAK BUDAYA KERJA TERHADAP VOLUME PENJUALAN PADA PT. PARIT PADANG GLOBAL CABANG CIREBON
Authors: Restu Agung Setiadi  , Vina Andita Pratiwi
Published: December 2022

ABSTRACT

This study aims to determine the impact of work culture on sales volume at PT. Parit Padang Global Cirebon Branch. The type of research used in this study uses a quantitative approach with a simple linear regression analysis technique. The type of data used is primary data obtained through a questionnaire survey using SPSS for Windows version 26 and observation. Secondary data obtained from company data as well as several books and journals that can be accounted for. The sample in this study was 75 respondents with probability sampling using a simple sample technique. The results of this study there is no significant impact between the variables of Work Culture and sales volume with the results tcount 1.001 < t table 1.66600 with a significance level of =5%. While the R Square value of 0.014 means that the variables of Work Culture and Sales Volume have an influence of 1.4% on sales volume, while the remaining 98.6% is influenced by other variables not examined by the author..

ABSTRAK

Penelitian ini bertujuan untuk mengetahui Dampak Budaya Kerja Terhadap Volume Penjualan Pada PT. Parit Padang Global Cabang Cirebon. Adapun jenis penelitian yang digunakan dalam penelitian ini menggunakan pendekatan kuantitatif dengan teknik analisis regresi linear sederhana. Jenis data yang digunakan adalah data primer yang diperoleh melalui survey kusioner dengan menggunakan SPSS untuk Windows versi 26 dan observasi. Data sekunder yang diperoleh dari data perusahaan serta beberapa buku dan jurnal yang dapat dipertanggung jawabakan. Sampel dalam penelitian adalah sebanyak 75 responden dengan probability sampling menggunakan teknik sampel sederhana. Hasil penelitian ini tidak terdapat dampak yang signifikan antara variabel Budaya Kerja dengan volume penjualan dengan hasil thitung 1.001 < t tabel 1.66600 dengan tingkat signifikansi α=5%. Sedangkan nilai R Square sebesar 0.014 artinya bahwa variabel Budaya Kerjadan Volume Penjualan mempunyai pengaruh sebesar 1,4% terhadap volume penjualan, sedangkan sisanya sebesar 98,6% dipengaruhi variabel lain yang tidak diteliti oleh penulis.
Design and Implementation of New Biorthogonal Wavelets and its Application to
Image Processing
Authors: Reddy E Sasikala , Sathyanarayana TVV
Published: December 2022

Wavelet transformation has been an interesting field since its exposure with wavelet-based compression standard embedded zerotree wavelet. Though, the origin of wavelets back to many decades, the presence of research at the very beginning of wavelet bases is also being carried out in the research community. This is because of the wide presence of its applicability as well as its structure of adapting to the type of problem at hand. In this paper, an approach of designing biorthogonal wavelets is presented. This approach may be extended to design variety of wavelets. This paper mainly focus on the design steps and corresponding coding in MATLAB. By varying the length, type of the bases and other parameters, different wavelets may be devised.
Region Based Non-Uniform Scheme for Effective Retargeting
Authors: Reddy Ethireddy Sasikala , Swathi Y , Chandini K , Swetha S , Swapna Ch
Published: December 2022

With the invent of displays of varied features like bendable displays, twistable displays and slant displays the feed of these displays need to be adjusted so that useful objects of the scene are not destroyed. In general, if we want to project a particular scene of specified size after capturing on the display of other dimensions, image resizing is done. In image resizing, the whole image will be converted into dimension of the target display. In the process the whole image, including all the objects may be expanded or squeezed depending on the size of the target display. But, in image retargeting, in addition to
changing the size of the image to suit the target display, some additional intelligence will be added there by preserving or retaining useful objects and removing unnecessary background information. In this paper, the global significance map will drive the retargeting which is formed by merging the local significance maps. The local significance maps are derived after forming regions by considering the average intensity levels locally. The simulation results clearly show the superiority of the scheme proposed
Distributed Reduced Convolution Neural Networks
Authors: Mohammad Alajanbi  , Donato Malerba  , He Liu
Published: December 2022

A Convolution Neural Network (CNN) is a popular tool in the domains of pattern recognition and machine learning. The performance of KCNN (kernel-based convolutional neural networks) is better than that of regular CNN. Although the KCNN can solve challenging nonlinear problems, doing so when dealing with a large-size kernel matrix is time-consuming and memory-intensive. The computational load and memory usage could be drastically decreased by adopting a reduced kernel strategy. But as the total amount of training data grows at an exponential pace, it becomes hard for a single worker to efficiently store the kernel matrix. Because of this, there can be no effective centralised data mining. In this research, we suggest the use of a distributed reduced kernel, or DRCNN, to train CNN using data that is stored in several locations. The data in the DRCNN will be spread out amongst the nodes at random. Static communication between nodes is defined by the network's architecture rather than the quantity of training data kept on each node. The DRCNN is an alternate direction multiplier (ADMM)-based distributed training technique, in contrast to the standard reduced kernel CNN. Experiments on the huge data set show that the distributed method may yield nearly the same results as the centralised algorithm, and it takes significantly less time. As a result, the amount of time spent computing is drastically reduced.
Introduction to The Data Mining Techniques in Cybersecurity
Authors: Israa Ezzat Salem  , Mijwil Maad , Alaa Wagih Abdulqader  , Marwa M. Ismaeel  , Anmar Alkhazraji  , Anas M. Zein Alaabdin
Published: December 2022

As a result of the evolution of the Internet and the massive amount of data that is transmitted every second, as well as the methods for protecting and preserving it and distinguishing those who are authorized to view it, the role of cyber security has evolved to provide the best protection for information over the network. In this paper, the researcher discusses the role of data mining methods in cyber security. Data mining has several uses in security, including national security (for example, surveillance) and cyber security (e.g., virus detection). Attacks against buildings and the destruction of key infrastructure, such as power grids and telecommunications networks, are examples of national security concerns. Cybersecurity is concerned with safeguarding computer and network systems from harmful malware such as Trojan horses and viruses. In addition, data mining is being used to deliver solutions such as intrusion detection and auditing.
Integration and development of learning management features into the Colums platform
Authors: Samer Qahtan Hameed  , Tam Sakirin  , Yahya Hakami
Published: December 2022

Due to the increasing use of computerized information systems in higher and further education for both administrative (Human Resources, Finance, Student Records) and instructional (Teaching, Learning, and Research) purposes, the challenge of systems integration has emerged like Virtual Learning Environments, electronic resource discovery tools, etc. COLUMS is a comprehensive and deeply integrated software product for large, medium, and small educational institutions that automates data stream and can be thought of as an Organization Wide Computing Package.  The concept of COLUMS is to interconnect Students, Teachers, Parents and Management in effective manner. To meet all the requirements of the customer, the system needs to be upgraded and merged with the E-learning system. In terms of administration and remote learning, the new system provides all requirements of the university. The use of this technology is to enable people to learn anytime and anywhere, and not only depend only on attend of the student to the university to learn and take the courses. Given the shortcomings of the COLUMS, this project introduces new capabilities and services to address these issues. such as selecting the course to study online, with easy and fast way to enroll to the course, each course will contain number of lessons which contain the scientific   material,   as   well   as   add   some   extra   feature   to   the   course   like announcement, drop box, homework, document and chat room. For the future work, add a more feature of alerting the users by sending phone SMS when the any change happen  in  the  course.  Moreover,  white  board  technology  (virtual  Class)  so  the teacher can use the electric white board to describe the content of his subject online and the student can see the lesson as stream video. Finally, make the accessing of this system not only though browsing by the computer but also use the smart phone and tablet.
Implementation Of Gagne's Nine Events On Islamic Education Subjects At Sdn Tamansari 03 Wuluhan Jember
Authors: Firda  , Khoirul Anam
Published: December 2022

Every learning theory has a focal point that takes center stage. There is more emphasis on the learning process, there is emphasis on the learning process, there is emphasis on the content or what is learned, there is more emphasis on the learning process, and there is emphasis on the learning process, there is emphasis on learning outcomes, there is emphasis on the content or what is learned, there is more emphasis on the learning process, and there is emphasis on themselves. We will continue to strive to provide the best solution for those of you who want to learn more.One of the important learning theories and principles to be applied or applied in learning activities is the theory of Robert M. Gagne is known for his 9 learning events or nine instructional events model. This research uses qualitative research with field research approach. Data collection techniques using insights, observations and document studies. The Data obtained were analyzed and tested the usefulness of using triangulation. The purpose of this study is to describe and analyze how the process of implementing Gagne nine events on Islamic education subjects at SDN Tamansari 03 Wuluhanjember. The results of this study indicate that the implementation of Gagne nine events in learning events include getting attention, informing learners of overall training objectives, stimulating recall of previous lrarning, presenting rhe stimulus/ content, providing tutoring, eliciting performance, providing feedback, assessing performance and enchancing retention and transfer.

Keyword: Implementation, Gagne’s Nine Event, Islamic Education Subjects
Analysis of Fuel Supply Control (Palm Shell) Using EOQ Method in Pt. Charoen Pokphand Indonesia Tbk
Authors: Abdul Rasyid  , Widawati Enny , Bachtiar W Marsellinus
Published: December 2022

PT. Charoen Pokphand Indonesia Tbk. (Gorontalo) is still experiencing problems in managing fuel supply where the company often experiences a lack of inventory that hinders the production process. The company also experienced excess inventory, causing storage costs to rise. For this reason, companies need to exercise inventory control. One of the analytical tools that can be used to control inventory is the "Economic Order Quantity" (EOQ). From the calculation results, it was found that the optimal number of fuel supply purchases from palm oil shells using the EOQ method is 352 tons with a purchase frequency of 3 times in one period (1 year) so that the company can save fuel procurement costs. . The total inventory cost of raw materials with an EOQ of Rp. 32,845,640 while the cost incurred by the company without using EOQ amounted to Rp. 34,731,000. The savings that can be made by the company is Rp. 1,885,360 with a Reorder Point of 81.9 tonnes and a total safety stock of 241 tonnes.
The impact of entrepreneurial leadership on innovative employee behavior: A multi-group analysis comparing the United States, Serbia, and Bosnia and Herzegovina
Authors: Kreiner Jesa , Sajfert Dragana , Vasić Živorad , Jančev Nikola , Živković Milorad
Published: December 2022

In the research of this paper, the center of events is entrepreneurial leadership as a new concept for the work behavior of associates. This study aims to determine the entrepreneurial self-efficiency and inclination of entrepreneurs towards innovation and creativity of entrepreneurs. The research aims to achieve results that reveal the relationship between entrepreneurial leadership and the work behavior of employees. The study tested 360 individuals - subordinates in small and medium enterprises operating in the United States - California, Serbia - Vojvodina, and Belgrade, and Bosnia and Herzegovina - Republika Srpska. Based on the obtained results, a model was made and hypotheses were tested. It was a big problem to harmonize the results of research from these three regions. Careful processing of the data resulted from these results. The results obtained have a significant effect on innovative entrepreneurship, which again aims to determine whether there is entrepreneurial leadership and in what form. The research found that innovative entrepreneurs mediate between entrepreneurial leadership and the innovative behavior of associates. The results obtained in this study confirm the hypothesis that entrepreneurial self-efficiency has an adequate effect on the connection between entrepreneurial leadership and the innovative behavior of employees in the companies in which they work. The results of this research work are intended to achieve the originality of entrepreneurship and small and medium enterprises dealing with innovation and a challenging business environment. According to the findings of numerous authors who deal with this issue, this research is not the first attempt to develop innovative behavior of employees in entrepreneurial small and medium enterprises, but it certainly has a great impact on increasing the effectiveness of entrepreneurial leadership on innovative behavior.
Evaluation of financial performance and efficiency of companies in Serbia
Authors: Lukić Radojko
Published: December 2022

Recently, various methods of multi-criteria decision-making, as well as DEA(Data Envelopment Analysis) models, have been used more and more worldwide to measure the financial performance and efficiency of companies. Based on that, this paper analyzes the efficiency of companies in Serbia using the ARAS method. According to the ARAS method, five most efficient companies in Serbia are JP POŠTA SRBIJE Belgrade, JP EPS Belgrade, JP SRBIJAGAS NOVI SAD, JP PUTEVI SRBIJE Belgrade and COCA-COLA HBC - Serbia DOO ZEMUN. First four are public companies, and the fifth is from the processing industry sector. Public enterprises are fundamentally efficient. Trading companies are well positioned. So, for example, the DELHAIZE Serbia DOO Belgrade retail chain is in the eleventh place. The efficiency factors of companies in Serbia are, in addition to macroeconomics, managerial skills in managing the company. They differ from company to company. Digitization of the company's entire operations plays a significant role in this.
Production of niobium: Overview of processes from the mine to products
Authors: Do Nascimento , Cury Marques , de Campos , Pointer Malpass , Alves Roberto
Published: December 2022

A number of industrial and technology sectors have been paying attention to a particular chemical element in recent years, namely niobium (Nb). There are many niobium deposits scattered around the world, and for each deposit different technologies are applied for extraction and processing due to the singular characteristics present at each site. In this paper, a review of the many technologies for niobium production will be presented starting at the mine, through techniques of niobium ore beneficiation and refining, technologies to produce ferroniobium alloy, oxides, special oxides, ammonium niobium oxalate, the separation of niobium from tantalum, and techniques to reduce and purify metallic niobium.
Overview of technologies for Zn extraction from hyperaccumulating plants: Current state of research and future directions
Authors: Jovanović G. , Ranđelović D. , Marković B. , Sokić M.
Published: December 2022

Phytomining, although predominantly in its early stages on the broader scientific scope of investigation, has garnered interest in metals such as Ni, Au, or rare earth elements (REE). However, Zn pollution from mine wastes, smelters, coal ash and other anthropogenic sources has become an environmental problem. Phytoremediation by hyperaccumulating plants is one of the proposed solutions to mitigate the pollution. Therefore, a need to utilize or dispose Zn hyperaccumulating plants occurred. Since studies of certain hyperaccumulating plant species have been previously conducted in order to extract metal products, similar hydrometallurgical and pyrometallurgical techniques were tried with Zn. The hydrometallurgical route was more focused on producing crude eco catalysts for organic chemistry or separating metal hydroxides by cementation. This was achieved with acid leaching of the ash which was obtained by calcinating the aboveground plant biomass. On the other hand, the pyrometallurgical route was more focused on safe and eco-friendly disposal of combustion products such as ash or biochar, while achieving zero toxic gaseous emissions from biomass pyrolysis. Regardless of the approach further research is needed to investigate the stabilization of metals that remain in the solid fraction during combustion and lowering the metal content in produced gases. So far, none of these technologies have been brought to a semi industrial scale and there is the potential of linking those two approaches together.
Assessment of quality risk factors during the construction phase of the Biconsi Tower project
Authors: Phan Phuong , Nguyen Phong , Nguyen Quan
Published: December 2022

Project performance is assessed using various criteria. Quality is one of the typical triangle criteria used to assess the performance of any office building project. However, office projects in Vietnam have faced numerous quality risks, particularly during their construction periods. This can cause the building projects to be delayed and over budget. As a result, identifying quality risk factors throughout the construction phase of office projects is essential. Therefore, this paper applies the analytical hierarchy process to prioritize critical risk factors affecting project quality during the construction phase of the Biconsi Tower project in Vietnam. The research results show that the five top risk factors affecting the quality of the Biconsi Tower project from most to least impact are as follows: (1) inspection and approval work are not in accordance with regulations and procedures, (2) lack of coordination between project stakeholders, (3) poor quality design documents and drawings, (4) poor construction methods, and (5) poor quality input materials.
High efficiency public transportation system: Role of big data in making recommendations
Authors: Sazu Mesbaul , Jahan Sakila
Published: December 2022

With increasing urbanization across the world, the demand for smart transportation methods to support everyone, as well as freight, becomes more vital. To tackle the challenges of growing congestion on the roads, big data analytics (BDA) strategies can be used to offer insights for real decision-making, and policy designing. This study has two primary goals. First, this study evaluates academic literature regarding BDA for smart commuter routes programs; and next based upon the studies, it suggests a framework that is effective, but comprehensive in making recommendation to drive down the congestion and increase efficiency of shared transportation system. The study believes that the framework suggested is solid, versatile, and adaptive enough to be implemented in transportation systems in large cities. Using the framework, system will be managed in a centralized system, allowing much more efficient transportation across cities. Further studies should be conducted over a long period, in smaller cities as well, to make improvement on the framework.
Cyber security and tourism: Bibliometric analysis
Authors: Kovačić Matija , Čičin-Šain Marko , Milojica Vedran
Published: December 2022

The topic of cyber security in tourism is of particular importance since tourists in foreign countries are one of the most vulnerable groups due to a lack of knowledge of languages, laws, etc. With the increase in the number of technologies that enable interactivity, contactless payments, i.e., informative content for tourists, risks for the security of tourists' data as well as risks related to the theft of data on tourists' bank cards are emerging. In order to identify the current knowledge, i.e., the current situation in the context of research on cyber security in tourism, a bibliometric analysis was conducted, which indicated that an insufficient number of authors research cyber security and that there is not a sufficient number of studies that would analyze the mechanisms and measures of increasing cyber security in tourism. The importance of researching cyber security in tourism is based on the fact that tourism is a particularly vulnerable and sensitive branch of the economy to risks that affect tourists as such, and that it can depend on the reputation of the country, institutions, or hotels. The bibliometric analysis conducted in this paper is significant for future researchers considering that it can serve as a basis for researchers' focus on specific areas of cyber security.
The role of the electrocardiogram in identifying the risk of sudden cardiac death
Authors: Zogović Biljana , Stašević Miljan , Radić Ivan
Published: December 2022

Introduction: Sudden cardiac death (SCD) represents the unexpected and sudden death of young apparently healthy people. Alarge number of examined cases referred to professional athletes. There is not enough data in the literature related to those who performed sports in a sporadic and recreational manner. In order to prevent SCD, a screening protocol was determined, in which, an ECG performed at rest plays a important role. Based on the established criteria, changes on the ECG can be treated as normal, borderline and abnormal. An abnormal result indicates a risk of SCD. Objective: The aim of this study was to determine the risk of SCD in students who practice physical activity recreationally. Methods: The research involved 500 students (both sexes) of the 1st and 3rd year of study on the University of Pristina situated in Kosovska Mitrovica. As part of the regular systematic examination, an ECG was performed at rest. The risk of SCD was determined by analyzing the changes on the ECG and grouping them based on screening recommendations. Results: The obtained results show that 44% of students had changes on the ECG and that 8% of students had an abnormal result indicated a possible risk of sudden cardiac death. Conclusion: Therefore, timely recognizing and interpreting ECG changes in accordance with screening recommendations is an imperative for identification and possible prevention of SCD.
Prevalence, etiology and treatment of psychogenic aphonia in children: A case report
Authors: Petrović-Lazić Mirjana , Ilić-Savić Ivana
Published: December 2022

Introduction. Emotions are one of the most important psychological processes, with a decisive influence on a person's voice. Faced with the great challenges and changes that primary and secondary socialization agents impose in the process of growing up, children consequently experience a spectrum of various unpleasant feelings: anxiety, fear, anger, frustration and sadness. Due to the fast-paced lifestyle, it often happens that the child ignores unpleasant feelings, which further worsens the condition in which he finds himself. Among other conditions, psychogenic aphonia in children has become more frequent in recent years. The current case report aims to determine the frequency of psychogenic aphonia in children, to identify the most common causes that lead to psychogenic aphonia and highlight the methods of vocal treatment that give the best results during rehabilitation. Case report. The current paper presents the results collected in a two-year period at the Clinic for Ear, Throat and Nose of the Clinical Hospital Center "Zvezdara". In the period from March 2017 to May 2019, psychogenic aphonia was diagnosed in 31 patients, which is an evident increase compared to the previous ten-year period in which psychogenic aphonia was diagnosed in 38 younger patients. Analyzing heteroanamnestic data obtained from parents, the most common answer about the cause of psychogenic aphonia is dissatisfaction with school success. After successful diagnostics by an otorhinolaryngologist, psychiatrist and vocal pathologist, in the process of rehabilitation of psychogenic aphonia, methods of digital manipulation of the larynx, methods of restoring the voice with cough reflex and methods of turning out the feedback system were applied. In this particular case, the method of digital manipulation of the larynx gave the best results. Conclusion. Optimal evaluation of patients with voice disorders requires the joint efforts of experts from different disciplines. Having in mind the tendency of recurrence of psychogenic aphonia, these findings suggest that the integration of the interventions of a vocal pathologist and a psychiatrist could give effective results in the process of rehabilitation voice.
Numerical analysis of o propeller in ground effect
Authors: Svorcan Jelena , Kovačević Aleksandar , Ivanov Toni , Simonović Aleksandar
Published: December 2022

Detailed studies of propeller flows are regaining both interest and significance worldwide, as the number of their different design and applications (particularly for futuristic urban air vehicles) continues to grow. An additional distinctive characteristic of small-scale unmanned air vehicles (UAV) propellers is that they are meant to operate in a wide range of (previously considered atypical) operating conditions, including backward flight, flight in the vicinity of obstacles, hard/ground surfaces, etc. These specific requirements raise the issue of the effects of ground proximity on their aerodynamic performance. This paper computationally investigates flows around a small-scale, custom-made propeller in ground effect. Different ground distances are considered and novel thrust and power relations (dependencies) on them are proposed. In order to obtain sufficiently reliable and accurate results and capture the most significant flow features, Reynolds-averaged Navier-Stokes (RANS) equations are solved by finite volume method. In addition, interesting flow visualizations are presented. Although the obtained thrust trend correlates well with the conventionally used semi-empirical formula, more realistic estimations are obtained for small ground distances. Furthermore, the positive effects of ground vicinity on rotor aerodynamic performances are once again confirmed and quantified.
Fire-resistant composites based on acrylic-functionalized lignin and polyester resin obtained from waste poly(ethylene terephthalate)
Authors: Knežević Nataša , Jovanović Aleksandar , Bošnjaković Jovan , Milošević Milena , Rančić Milica , Marinković Aleksandar , Gržetić Jelena , Gamoudi Houda
Published: December 2022

This paper investigates the using potential of acryl-functionalized kraft lignin (AKL) in reducing the flammability of polymer composites based on recycled unsaturated polyester resins (UPR). Acryl functionalization of kraft lignin was performed by direct esterification of free polyphenolic groups with acryloyl chloride, after what, the AKL was blended in UPR resin synthesized from the polyols obtained by catalytic depolymerization of waste poly(ethylene terephthalate). The AKL was homogenized in UPR resin in different weight ratios: 2.5, 5.0, 7.5, and 12.5 wt.%. Structural and dynamic-mechanical characteristics of acryl-functionalized kraft lignin and composites were determined using FTIR spectroscopy, dynamicmechanical analysis (DMA), and tensile tests. The influence of functionalization and mass fraction of AKL on tensile and thermal properties of UPR resin was studied. The thermal properties of the composite were tested according to the standard UL-94 method, based on which the highest category of heat-resistant materials is a composite with 12.5 wt.% acylfunctionalized lignin.
Lead compensator design for DC motor driven electromechanical fin actuator
Authors: Adamović Pavle , Petronijević Zlatko , Jovičić Nebojša , Stefanović Aleksandar , Pavić Miloš
Published: December 2022

This paper presents modeling, simulations and control of the ground-to-air missile fin actuation system, where brushed DC motors are used as actuators, which are driven using voltage regulation-Pulse Width Modulation (PWM). The mathematical model of the system was determined using the differential equations of behavior of the lowest order that was experimentally confirmed. This model was taken as a starting point in the synthesis of the Lead compensator, used to regulate the position of the missile's control surfaces. The trial and error method was used for the synthesis of Lead compensator, taking care to meet the required characteristics of the System, in form of bandwidth and gain. The improved transient process and behavior of the System have also been experimentally confirmed.
Improving the mechanical and wear behaviours of reinforced aluminium alloy with animal waste particulates ash
Authors: Ogheneblorhie Ogheneme , Olagunju Suraj , Guruza Abdullahi , Sani Habeeb , Suleiman Idawu , Aliyu Isah , Shaibu Lasisi , Mohammed Abdullahi
Published: December 2022

The research work investigated the mechanical and wear behaviours of aluminium alloys reinforced with cow horn ash (CHA) which is cost-effective and environmentally-friendly materials at different weight percentages (0 wt. % to 15 wt. %) at 3 wt. % interval. The cow horn ash was characterized by X-ray fluorescence (XRF). The matrix and the composites morphology were studied using a scanning electron microscope (SEM) for the distribution of cow horn ash particles within the matrix. The wear behaviour of the alloy and composites produced at various reinforcements were carried out using a Taber abrasion wear-testing machine. The XRF showed the compositions of CHA to contain carbon (95.70 %), silicon (2.60 %), calcium (1.00%) and others. Mechanical properties investigated increase with increase in 3 wt. % to 15 wt. % of CHA. The morphologies revealed uniform distribution of CHA within the matrix resulted to the improvement in both mechanical and wear properties. The wear resistance of the composites increases with increase in the applied load and decreases with increases in the weight percentage of CHA and this can be used in the automobile and engineering industries for the productions of brake shoes, electrical insulators and others.
Application of fly ash for flouride adsorption
Authors: Vuković Jelena , Obrenović Milomirka , Smiljanić Slavko
Published: December 2022

The suitable characteristics of fly ash from thermal power plants make it a proper adsorbent for removing various pollutants from water and aqueous solutions. Valorization and utilization of fly ash can reduce the use of conventional adsorbents. The paper presents an overview of the possibility of using raw and modified fly ash to remove fluorides from water and aqueous solutions, as well as the influence of different process parameters (sorbent dose, contact time, pH value, temperature, etc.) on the value of adsorption capacity and adsorption efficiency of used sorbent. Fly ash can be used as an effective sorbent for the removal of fluoride, both in raw and modified form, with given optimal process parameters. Raw fly ash shows better adsorption properties when performing the experiment in a column, with a higher dose of sorbent and longer contact time, in an acidic environment (pH = 2-3), compared to batch experiments. Various authors have modified fly ash by treatment with certain chemical agents (HCl, Ca (OH)2…) or by synthesis of zeolite based on fly ash. Modification of fly ash improves its adsorption properties, so in slightly acidic conditions (pH = 6), for a relatively short contact time (10-30 min), in batch conditions, significant adsorption efficiency (~ 90%) can be achieved.
Assessment of water pollution of the South Morava River (Serbia) by statistical and index methods
Authors: Zdravković Aleksandar , Petković Goran , Marković-Nikolić Dragana , Stojadinović Danijela , Ristić Ivanka , Ristić Nebojša , Nikolić Tanja
Published: December 2022

Factor analysis/principal component analysis (FA/PCA), applied to 16 physico-chemical parameters at three different monitoring sites (Mojsinje, Korvingrad, and Ristovac) of the South Morava River in 2015, and from 2011-2018 for station Ristovac, extracted two and four varimax factors which explain 100.000 and 90.874 % of the total variance in water quality, respectively. The relationships among the stations and years obtained by cluster analysis (CA) categorize observed objects in different quality levels. Parameters responsible for pollution of the South Morava River are related to point (industrial/sewage effluents), non-point (runoff from arable land and erosion), and natural source (a mineral component of the river water). The results of the water pollution index (WPI) method for 2015 have shown that the South Morava River at Korvingrad station represents a "moderately polluted" water body (class III), but at Mojsinje and Ristovac station a "polluted" water body (class IV). The obtained ecological potential values indicated that water quality at the Korvingrad station corresponds to class II, "good ecological potential". The surface water at Mojsinje and Ristovac stations deviated from the required ecological water standards by the European Union Water Framework Directive (EU WFD), class III. The South Morava River had the highest load of nutrients (PO4-P and TP) and organic matter (TOC) at Ristovac station, which was confirmed by the index and comparative method (polluted water with poor ecological potential) in period from 2011-2018. A comprehensive analysis of the paper identified a decreasing trend in pollution of the South Morava River, primarily at Ristovac station.
Corrosion resistance of SS 18/8 alloy and Gold 22 K alloy in artificial sweat in the presence of D-Glucose
Authors: Anitha Nilavan , Prathipa Venkatachalam , Velkannan Veerapandian , Dhanalakshmi Marimmuthu , Subashini Mary , Aishwarya Subramani , Jenifer Francis , Shree Balu , Singh Gurmeet , Al-Hashem Abdulhameed , Rajendran Susai , Lačnjevac Časlav
Published: December 2022

Corrosion resistance of SS 18/8 alloy and Gold 22 K alloy immersed in artificial sweat in the absence and presence of 100 ppm of D-Glucose has been investigated by polarization study and AC impedance spectra. It is observed that corrosion resistance of SS 18/8 alloy and also Gold 22 K alloy immersed in artificial sweat in the presence of 100 ppm of D-Glucose decreases. Hence it is concluded that people wearing ornaments made of these two alloys need to worry about the excess of D-Glucose in their sweat. When SS 18/8 alloy is immersed in artificial sweat in the presence of 100 ppm of D-Glucose, Linear Polarisation Resistance value decreases from 589308032 Ohmcm2 to 87905 Ohmcm2 ; corrosion current increases from 8.923x10-11A/cm2 to 4.008x10-9 A/cm2 ; charge transfer resistance value increases from 4884 Ohmcm2 to 3.168 x10-7 12210 Ohmcm2 ; impedance value decreases from 8.023 to 4.008; double layer capacitance increases from 8.9099x10-14F/cm2 to 1.4868 x10-9 F/cm2 , and phase angle decreases from 94° to 54°. When Gold 22 K alloy is immersed in artificial sweat in the presence of 100 ppm of DGlucose, Linear Polarisation Resistance value decreases from 4248438 Ohmcm2 to 236576 Ohmcm2 ; corrosion current increases from 8.038 x10-9A/cm2 to 1.546 x10-7A/cm2 ; charge transfer resistance decreases from 23680 Ohmcm2 to 6336 Ohmcm2 ; impedance value decreases from 4.647to 4.567; double layer capacitance increases from 2.154 x10-10 F/cm2 to 8.049x10-10 F/cm2 , and phase angle increases from 66° to 64°.
Corrosion resistance of orthodontic wire made of nickel-titanium alloy in artificial saliva in the presence of Kopiko candy
Authors: Anitha Nilavan , Narendran Nellainayagam , Velkannan Veerapandian , Nandhini Gurumoorthy , Jenifer Francis , Subashini Mary , Aishwarya Subramani , Nithiya Shree , Singh Gurmeet , Al-Hashem Abdulhameed , Rajendran Susai , Lačnjevac Časlav
Published: December 2022

Corrosion resistance of an orthodontic wire made of Ni-Ti alloy immersed in artificial saliva in the absence and presence of 500 ppm of Kopiko candy has been investigated by polarization study and AC impedance spectra. It is observed that corrosion resistance of Ni-Ti alloy immersed in artificial saliva in the presence of 500 ppm of Kopiko candy increases. Hence it is concluded that people clipped with orthodontic wire made of Ni-Ti alloy need not worry about taking Kopiko candy orally. When Ni-Ti alloy is immersed in artificial saliva in the presence of 500 ppm of Kopiko candy, Linear Polarization Resistance value increases from 347978 Ohmcm2 to 415003 Ohmcm2 ; corrosion current decreases from 1.346 x10-7A/cm2 to 1.105 x10-7A/cm2 ; charge transfer resistance value increases from 31945 Ohmcm2 to 44357 Ohmcm2 ; impedance value increases from 4.649to 4.819; double layer capacitance decreases from 1.596x10-10F/cm2 to 1.150 x10-10F/cm2 , and phase angle increases from 39.63° to 50°.
Influence of thiourea on the corrosion resistance of mild steel immersed in simulated concrete pore solution
Authors: Shanthy Pooviah , Kavipriya Karunaivel , Santhiya Brintha , Priyanka Ganesan , Vigneswari Krishnasamy , Velkannan Veerapandian , Singh Gurmeet , Al-Hashem Abdulhameed , Nilavan Anitha , Rajendran Susai , Lačnjevac Časlav
Published: December 2022

The corrosion resistance of mild steel in simulated concrete pore solution (SCPS) in the absence and presence of thiourea has been investigated by polarization study and AC impedance spectra. Polarisation study reveals that thiourea system functions as anodic inhibitor. AC impedance spectra reveal that a protective film is formed on the metal surface. When mild steel is used as rebar, thiourea may be mixed with concrete. Thus the mild steel will be protected from corrosion. The protective film consists of iron-thiourea complex formed on metal surface. In the presence of thiourea the linear polarisation resistance increases, corrosion current decreases, charge transfer resistance (Rt) increases, impedance increases, phase angle increases and double layer capacitance (Cdl) value decreases. This formulation may find application in concrete technology.
Inhibition of corrosion of L 80 alloy pipeline carrying simulated oil well water by succinic acid
Authors: Krishnaveni Arjunan , Anitha Nilavan , Velkannan Veerapandian , Jayanthi Sampathkumar , Shanthi Thangaiyan , Sevvanthi Kuttipaiyan , Kaniya Duraisamy , Thulasi Elumalai , Sarmina Duraisamy , Singh Gurmeet , Al-Hashem Abdulhameed , Rajendran Susai , Lačnjevac Časlav
Published: December 2022

Simulated oil well water (SOWW) is conceded out by pipelines made of several alloys, for instance mild steel L80. These alloys may simulated oil well water undergo corrosion owing to presence of various aggressive ions present in SOWW. To prevent this several inhibitors have been used. Inhibition of corrosion of L80 alloy pipeline carrying simulated oil well water by succinic acid has been evaluated by electrochemical studies such as polarization study and AC impedance spectra (EIS). Polarisation study reveals that in the presence of inhibitor linear polarization resistance increases and corrosion current decreases. AC impedance spectra reveal that in presence of succinic acid, RT value increases, impedance value increases, phase angle increases and Cdl value decreases. The present study reveals that when succinic acid is added to simulated oil well water, the corrosion resistance of L80 alloy increases. It implies that succinic acid may be added to simulated oil well water flowing through pipe line made of L80 alloy.
Study on mechanical properties of Inconel 625 and Incoloy 800H with nitrate based molten salts
Authors: Kamatchi Hariharan , Anderson Arul , Suresh Kannan
Published: December 2022

Energy storage is the most indispensable technology in the recent days with augmented power demand, which helps in balancing the energy demand and production time. Among the broad spread of energy storage types, molten salts technology in concentrated solar plants is most economical, highly efficient with excellent duration on the storage timings. In this current effort, Inconel 625 and Incoloy 800H nickel based super alloys have been taken and heated with sodium nitrate and potassium nitrate molten salts. The super alloy substrates were coated with Yttria stabilized zirconia as thermal barrier coating which could enhances the heat resistance and corrosion resistance property of the base substrates. Both layered and non-coated super alloy samples were intense to a fairly accurate temperature of 1000 o C for different duration as 9, 12 and 15 hours. The mechanical properties of both unheated and heated specimens were compared with the results obtained from tensile test, compression test, hardness test, and impact test. The changes in the micro-structural properties were investigated with the support of SEM images and by XRD analysis. The mechanical properties of YSZ coated specimens are found to be better than the uncoated specimens; which increases the sustainability of the super alloys with the molten salts.