bluuebunny/crossref_metadata_2025 huggingface dataset:
Chemical speciation of lead adsorbed onto volcanic ashes by ICP-OES and XANES
Authors: Blixen Bang Bolie , Thiodjio Sendja Bridinette , Medellin-Castillo Nahum Andrés , Loredo Portales René , Labrada Delgado Gladis Judith , Carranza Alvarez Candy , Germain Hurbert Ben Bolie , Leyva Ramos Roberto , Reyes López Simon Yobanny
Published: February 2022

This study focuses on the assessment of the VA materials from the Cameroon volcanic line (CVL) for their use as natural adsorbents to remove Pb(II) pollutant from aqueous solutions. The chemical speciation of lead adsorbed onto volcanic ashes based by means of inductively coupled plasma optical emission spectroscopy (ICP-OES) and X-ray absorption near edge spectroscopy (XANES) study is reported. The ashes from CVL are used to remove lead in aqueous solutions. The maximum value of the adsorption capacity of lead in volcanic ashes was 7.60 mg g-1 at pH 5. Regarding the adsorption process, the contribution of the mixture lead components after adsorption and a strong interaction of adsorbed lead with the surface of volcanic ashes were proven. The chemical elements present in the volcanic ash and their concentrations are determined by ICP-OES. Chemical speciation was carried out measuring Pb saturated volcanic ash sample at the L3 edge (13035 eV) at the XAFS beam line in Elettra Sincrotrone Trieste. The XANES measurements showed that the lead removal occurred mainly by microprecipitation of lead acetate and carbonate associated with a possible ion-exchange forming lead monoxide.
Methodology for monitoring the technical condition of GPU type GTK-25i in the process of operation
Authors: Zamikhovskyi L. M. , Zamikhovska O. L. , Pavlyk V. V.
Published: February 2022

In the early 1980s, 120 gas compressor units (GPU) type GTK-25i were installed on the Urengoy-Pomary-Uzhgorod transcontinental gas pipeline, and three of them are in operation at CS-39 “U-P-U” of the Bogorodchansk Linear Production Department of trunk gas pipelines. Today, about 80% of GPU type  GTK-25i have worked out the established service life, or those close to it. Their further operation does not ensure reliable and efficient operation, and therefore numerous failures and accidents occur, leading to significant economic losses.  Methods of parametric and vibroacoustic diagnostics of GPU are analyzed. It is noted that the most fruitful years of development of the methods of vibroacoustic diagnostics of GPUs are the 70-90s of the last century. Today, their development is taking place in the direction of using modern information technologies and various transformations in the processing of vibroacoustic processes to identify diagnostic signs of the technical state of the GPU.  The methods of diagnosing GPU type GTK-25i the analysis showed their absence. The exception is certain methods of their diagnostics based on modern information technologies, which were developed by the authors of the article. At the same time, the carried out improvement of the automatic control system (ACS) of the GPU type GTK-25i in terms of its technical and software makes it possible to obtain information about additional, in comparison with the standard ACS, technological parameters of the GPU type GTK-25i operation and vibroacoustic processes that accompany its operation. and can be used to create diagnostic methods for GPU type GTK-25i. The methodology for monitoring the technical condition of GPU type GTK-25i based on the determination of the highest values of the discriminant functions for each of the three technical states of GPU type GTK-25i for 16 technological parameters and acoustic and vibration characteristics is considered. At the same time, the best "nominal" condition is considered to be the state of GPU type GTK-25i after the repair work, the "defective" state "- before the repair work, and" current "- after the corresponding operating time of the GPU type GTK-25i. The use of the technique made it possible to develop a complex method, which is a combination of parametric and vibroacoustic diagnostics methods. It is shown that the use of the proposed method allows tracing the trend of changes in the technical state of GPU type GTK-25i in time and predicting the moment of its decommissioning. The developed method does not require additional technical means for its implementation, as it receives information from the improved ACS GPU type GTK-25i, which, in turn, can use the diagnostic results to control the gas compression process, taking into account the technical condition of the GPU type GTK-25i.
Installation of improved technical facilities for further development of gas-bearing formations at the drilling process
Authors: Roi M. M.
Published: February 2022

As a result of developed new methods of researching gas wells for stationary and non-stationary gas inflows to the bottom of the well, a new prospect looms in one actually worked out study mode. It consists in the fact that research can be performed not only in cased wells. This, to a certain extent, brings the study closer to testing formations while drilling. Practically, this idea is still far from being realized. Although this does not mean that one should not strive to approach her. Indeed, such attempts are already known and they were successful for shallow well depths. These attempts have identified the needs and indicated the direction of improvement in terms of technological methods and technical means. The equipment quality itself also plays an important role. As deeper depths require better quality equipment. Because we can talk about unstable reservoirs and possible high pressures of gas products. Naturally, such problems should be addressed in a comprehensive manner. That is, both technological approaches and technical means to meet their needs shall be considered simultaneously. It is clear that it is impossible to take into account all these needs in one publication. Therefore, the goal was to touch upon the issue of improving technical means for the study of gas wells in the process of drilling. The quality of technical equipment shall satisfy the conditions of reliability not only when working in a high pressure environment. It should provide the ability to perform tasks assigned to the technical means on the one hand. On the other hand, to obtain reliable research results. Because the requirements for the actual data of one tested study mode are very high. Since the subsequent processing of the research data will provide an opportunity to obtain the gas-hydrodynamic parameters of studied formations. And on their basis, the question of productive characteristics and prospects of the objects under study will be decided. This publication proposes an improved drillable packer and flush lock-off valve as advanced equipment. They belong to the underground equipment complex. Together with other test equipment, they provide testing of gas-saturated formations in the trial operation mode.
Determination of cam parameters of fixation node of the device for unscrewing of stuck pipes in the well
Authors: Havryliv S. Yu. , Liakh M. M. , Havryliv Yu. L. , Deineha R. O. , Tyrlych V. V.
Published: February 2022

Improvement of repair work efficiency in the elimination of drill pipe accidents  in a well is an extremely urgent task of oil field enterprises, and is achieved using special devices and tools. This paper analyses research and publications on this topic. The authors patented a device for unscrewing pipes in a well, in the fixation unit of which the use of a block of eccentric cams was proposed, and its experimental working model was made for research in a casing with a nominal diameter of D = 114 mm. The cycle of the device for unscrewing pipes in the well consists of three main periods: free running, jamming of the carrier of the device for unscrewing stuck pipes and the period of wedging. The article analyses operating conditions of the device fixation unit in the first two periods. The dependences of the power and geometric parameters of the device fixation unit on the angle of rotation of the cams are derived. Formulas are proposed for determining the force of pressing the cams against the casing during free travel, the moment of friction forces and power for this case. The dependence of the maximum permissible initial jamming angle on the friction coefficient and the geometric parameters of the device has been established. The lifting angle of the working surface of cams is determined. After substantiation of additional parameters of the block of cams to fulfill the condition of strength of its materials, it is planned to test a device for unscrewing pipes in an industrial environment in Factorial LLC, Poltava.
Determinants of Tourism Competitiveness in Emerging Tourists’ Destinations in the Arab Region: the Case of Saudi Arabia
Authors: Barakka Bakenas Ezzat
Published: February 2022

Gulf countries are witnessing unprecedent economic challenges to address the sharp decline on oil demand due to the drop in international commerce and transportations because of Covid-19 Pandemic crisis. This paper examines the roles of tourism authorities in the Arab region in managing and marketing tourists’ destinations drawing upon the case of Saudi Arabia. The later represents a special case worth of study because it is undergoing a transition from purely religious to leisure tourism phases. This situation has prompted the author’s attention to answer several questions such as what are tourism competitiveness indicators of the country, how its tourism sector is governed and equiped with qualified personnel , and how Saudi Arabia is marketed as a leisure destination? To answer these questions, the paper starts with identifying the determinants of tourism competitiveness through the review of literature. In addition it conducted a quantitative analysis of Travel and Tourism Competitiveness Index (TTCI) to stand on the comparative competitive position of the country with fifteen well established tourists’ destinations in the region. Secondary data was supplemented by face-to-face interviews and online surveys. A purposive sample of one hundred and twenty employees working in the Saudi Tourism Authority in Riyadh specializing in marketing, human resources and information systems was selected from six hundreds officials working in the authority. Data collected was analyzed using SPSS version 22. The results indicated three levels of tourism performances as low, average and good in Saudi Arabia. Main gaps were identified and a suggested framework was proposed to address them.
Lighthouse Tourism: Suggestions for an Innovative and Sustainable Use of the Greek Traditional Lighthouses
Authors: Moira Polyxeni , Kakaroucha Paraskevi , Mylonopoulos Dimitrios
Published: February 2022

The Hellenic Lighthouse Network (HLN) is one of the most extensive and organized systems worldwide. Some of its most remarkable and historic lighthouses and beacons have been characterized as “Monuments of Modern Cultural Heritage” and are available to the public for small-scale, non-profit cultural uses. An increasing number of activities have taken place at or near lighthouses for the past decade, but lighthouse enthusiasts are convinced that such events could be organized on a more frequent and regular basis. Lighthouses are delicate albeit multifaceted structures that attract people seeking sophisticated and solitary experiences beyond the mass tourism realm. Since the practical significance of lighthouses is declining due to advances in navigation technology, their cultural worthiness is rediscovered and utilized in many tourism development plans across the world. This paper aims at suggesting an innovative and sustainable framework for the tourist valorization of Greek traditional lighthouses that is respectful of their inherent tangible and intangible values. The historical background explaining the cultural heritage Greek lighthouses represent, as well as national legislation restrictions regarding their management, are discussed and taken into account.
Host Community’s Perception on the Socio-Cultural Effects of Carnival Calabar Festival and Tourism Development in Calabar City, Nigeria
Authors: Balogun Bolaji Khidir , Nkebem Victoria
Published: February 2022

This study examines residents’ perception of Carnival Calabar festival and tourism development in Calabar City, Nigeria. It intends to understand whether tourism development of the festival is commonly perceived as positive or negative in the city. A survey research technique was utilized for this study; thus, a total of 200 usable questionnaires were administered to the respondents in Calabar municipality. The findings revealed that, majority of residents have positive attitude about tourism. Findings revealed that pride in heritage, unification of the host community and employment opportunities associated to the event are the primary factors that influence tourism development of the festival. However, regardless of the general positive attitude accorded to tourism development of the festival, there are varying opinions by the residents on tourism influence in Calabar City. These opinions are largely influenced by the perceived benefits from tourism related activities. The results of this study contribute to the data for the management and sustainable development of festivals for tourism in Africa.
On the taxonomic position of the genera Paralusanda Synave, Paramangola Synave, Chondroptera Bergroth, and Neolollius Muir (Hemiptera: Auchenorrhyncha: Fulgoroidea: Nogodinidae)
Authors: Gnezdilov V.M.
Published: February 2022

Previously treated as members of the family Issidae and currently without clear status, four genera are transferred to the family Nogodinidae: genus Paralusanda Synave, 1956 is transferred to the tribe Mithymnini Fennah, genera Chondroptera Bergroth, 1910 and Neolollius Muir, 1921 – to the tribe Tongini Kirkaldy, and genus Paramangola Synave, 1956 – to the tribe Epacriini Fennah. Male and female genitalia of Paralusanda sinuatipennis Synave, 1956 and fore and hind wings of Paramangola schmitti Synave, 1956 are illustrated for the first time. Notes on ecology of P. sinuatipennis are made.
Clypeosmilus centrodasus gen et sp. nov., a new genus and species of the family Issidae (Hemiptera: Fulgoroidea) from Northern Vietnam
Authors: Gnezdilov V.M. , Soulier-Perkins A.
Published: February 2022

Clypeosmilus centrodasus gen. et sp. nov. is described from Northern Vietnam. The genus is closely related to Eusudasina Yang, 1994 and Tapirissus Gnezdilov, 2014 according to fore wing reticulate venation and flattened laterally postclypeus.
Lygus adspersus (Schilling, 1837) is a synonym of L. gemellatus (Herrich-Schaeffer, 1835) (Heteroptera: Miridae)
Authors: Demchenko N.Yu.
Published: February 2022

The synonymy of L. adspersus with L. gemellatus is restored. L. gemellatus f. adspersus corresponds to the overwintering generation in the southern part of the species range and to the single generation in the colder regions.
FEATURES OF THE VERSIONAL PROCESS IN THE USE OF METHODS OF FORENSIC COGNITION
Authors: Kararepanov N.
Published: February 2022

The article presents some theoretical questions about the content and structure of the theory as scientific knowledge. Methods of forensic cognition are used in obtaining reliable knowledge about the objects of research (traces). The movement of the process of cognition is carried out from the effect to the alleged cause, which forces to put forward a certain number of versions. And the aggregation of traces, as a process of their systematic selection for the holistic perception of past events, consists, from the point of view of the situational approach, in eliminating the problem situation (lack of reliable information) and transforming it into a simple one.

Attention is drawn to the nature of the validity of the version, which seems to be the insufficiency and incompleteness of contradictory and probabilistic information. Overcoming problem situations in the search, study, and use of traces of crime events is associated with a complex structure of the process of putting forward leads (stages). The beginning of such dynamics is characterized by the total collection of the entire non-systemic array of information. As a result of the heuristic thought process, the incoming information is analyzed and gives grounds for putting forward some already sufficiently substantiated assumptions in the form of versions. Versions are checked, filtered, and transformed into reliable information.

Strategic uncertainty, which forms a conflict situation, has a completely different character. Retro scient and predictive versions are useful in our research. Commenting on the complexity of the relationship between versions, it should be noted that more often different assumptions can be incompatible (inversions, disjunctions) and compatible (conjunctions and). At the same time, it is necessary to distinguish incompatible versions from counter versions, as a special kind of them.

 The versional process of searching for and studying traces of certain events has a pronounced heuristic character. The application of versions is particularly successful in circumstances where the content is limited as much as possible. These propositions manifest a new paradigm based on the constant change of one scientific direction from another. This is how the essence of version theory is expressed, based on an effective heuristic scientific concept.
HEALTH RISK BEHAVIOR AND MORBIDITY AMONG GEORGIAN STUDENTS AND PROGNOSIS OF POOR ACADEMIC PERFORMANCE
Authors: Sultanishvili T. , Petriashvili Sh. , Taboridze I.
Published: February 2022

The purpose of our study is to assess students’ health threatening behavior and morbidity and Prognosis of Poor Academic Performance

Design/methodology/approach: 766 Georgian students, aged 15 to 35 (20.7+/-2.4) from Georgian universities were interviewed, among them, 347 men and 419 women. The cross-sectional study was performed. We calculated the difference between groups by Fisher exact test. The correlation analysis was performed by means of Spearman ranking correlation. The risk assessment of bad academic achievement was performed using multiple binomial logistic regression. Statistical analysis was performed using program packet SPSS 23.

Findings: The stress perception during exams shows positive correlation with the headache - r=0.099, p=0.006; Increased appetite - r=0.072, p=0.045 and General self-assessment of health - r =0.279, p<0.001.

 In Georgian students’ population, the relative chance of poor academic performance is increased by: Stress perception during exams - OR=2.43(95%CI:1.23-4.81); Excess alcohol consumption - OR=2.66(95%CI:1.405.08); Tobacco consumption - OR=2.69(95%CI:1.60-4.53); Unpaid work - OR=3.34(95%CI:1.81-6.16); Diabetes - OR=2.44(95%CI:1.36-4.38); Surgery, associated with trauma in the anamnesis – OR=2.27(95%CI:1.10-4.68); Fractures during university years - OR=1.87(95%CI:1.06-3.31); Pathologies, detected in university years - OR=1.91(95%CI:1.02-3.56); It is decreased by balanced nutrition - OR=0.40(95%CI:0.22-0.70); 

Conclusions

Harmful habits lead to illness and hence, decrease in academic performance.

Students’ behavioral characteristics are linked with academic performance.
DIAGNOSTICS AND ASSESSMENT OF THE CONDITION OF HIGHWAYS
Authors: Odenbakh I. , Taurit E. , Makaeva A.
Published: February 2022

This article presents aspects of diagnostics and assessment of the condition of highways. The tasks and objectives of the system of diagnostics and assessment of the condition of highways are considered. It describes the primary and repeated diagnostics and assessment of the condition of roads, video recording of highways, recommendations for data processing, since the information obtained on the basis of diagnostics and assessment of the condition of roads serves for the formation and systematic updating of an automated road data bank at the federal and territorial levels.
Comparative study of on-label versus off-label treatment of intracranial aneurysms with the Pipeline embolization device
Authors: Cler Samuel J. , Lauzier David C. , Chatterjee Arindam R. , Osbun Joshua W. , Moran Christopher J. , Kansagra Akash P.
Published: February 2022

OBJECTIVE

The Pipeline embolization device (PED) is widely used for the treatment of intracranial aneurysms, including in off-label applications. In this work, the authors compared the real-world efficacy and safety of PED use in on-label and off-label aneurysm treatments.

METHODS

Clinical and angiographic data of patients who underwent PED placement at a high-volume academic medical center were retrospectively obtained. Treatments were classified as on-label if they fell within the applications approved by the United States Food and Drug Administration as of 2021. Recorded outcomes included aneurysm occlusion, procedural complications, ischemic events, in-stent stenosis, intracranial hemorrhage, postprocedural functional status, and death.

RESULTS

In total, 416 aneurysms in 330 patients were treated with PED, comprising 256 aneurysms that received on-label treatments and 160 that received off-label treatments. The overall rate of complete aneurysm occlusion was 76.4% for on-label aneurysms and 75.6% for off-label aneurysms (p = 0.898). The risk of ischemic stroke in patients who underwent off-label treatments was 15.2%, which was higher than the 4.2% rate in patients who underwent on-label treatment (p = 0.003). All other clinical complications, procedural complications, and long-term functional status were comparable between the on-label and off-label groups.

CONCLUSIONS

In real-world practice, off-label use of PED is common and can achieve similar efficacy as on-label use. However, in aggregate, off-label use was found to carry an increased rate of ischemic complications. With judicious attention to safety and individual patient characteristics, these results highlight the scale and general feasibility of off-label PED use by experts.
The effectiveness of reducing endotracheal cuff pressure after retractor placement to decrease postoperative laryngeal dysfunction in anterior cervical surgery: a meta-analysis
Authors: Miller Aaron , Griepp Daniel W. , Miller Chase , Hamad Mousa , De la Garza Ramos Rafael , Murthy Saikiran G.
Published: February 2022

OBJECTIVE

The authors sought to determine if a consensus could be reached regarding the effectiveness of endotracheal tube cuff pressure (ETTCP) reduction after retractor placement in reducing postoperative laryngeal dysfunction after anterior cervical fusion surgery.

METHODS

A literature search of MEDLINE (PubMed), EMBASE, Cochrane Central, Google Scholar, and Scopus databases was performed. Quantitative analysis was performed on data from articles comparing groups of patients with either reduced or unadjusted ETTCP after retractor placement in the context of anterior cervical surgery. The incidence and severity of postoperative recurrent laryngeal nerve palsy (RLNP), dysphagia, and dysphonia were compared at several postsurgical time points, ranging from 24 hours to 3 months. Heterogeneity was assessed using the chi-square test, I2 statistics, and inverted funnel plots. A random-effects model was used to provide a conservative estimate of the level of effect.

RESULTS

Nine studies (7 randomized, 1 prospective, and 1 retrospective) were included in the analysis. A total of 1671 patients were included (1073 [64.2%] in the reduced ETTCP group and 598 [35.8%] in the unadjusted ETTCP group). In the reduced ETTCP group, the severity of dysphagia, measured by the Bazaz-Yoo system in 3 randomized studies at 24 hours and at 4–8 weeks, was significantly lower (24 hours [standardized mean difference: −1.83, p = 0.04] and 4–8 weeks [standardized mean difference: −0.40, p = 0.05]). At 24 hours, the odds of developing dysphonia were significantly lower (OR 0.51, p = 0.002). The odds of dysphagia (24 hours: OR 0.77, p = 0.24; 1 week: OR 0.70, p = 0.47; 12 weeks: OR 0.58, p = 0.20) were lower, although not significantly, in the reduced ETTCP group. The odds of a patient having RLNP were significantly lower at all time points (24 hours: OR 0.38, p = 0.01; 12 weeks: OR 0.26, p = 0.03) when 3 randomized and 2 observational studies were analyzed. A subgroup analysis using only randomized studies demonstrated a similar trend in odds of having RLNP, yet without statistical significance (24 hours: OR 0.79, p = 0.60). All other statistically significant findings persisted with removal of any observational data.

CONCLUSIONS

Based on the current best available evidence, reduction of ETTCP after retractor placement in anterior cervical surgery may be a protective measure to decrease the severity of dysphagia and the odds of developing RLNP or dysphonia.
Clinicoradiological and histopathological characteristics and treatment outcomes of cerebral astroblastoma in children: a single-institution experience
Authors: Jeon Chiman , Kim Binnari , Choi Jung Won
Published: February 2022

OBJECTIVE

Astroblastoma (AB) is a rare glial tumor. The optimal treatment and prognosis of this tumor remain unclear. The authors retrospectively analyzed the clinical characteristics, neuroimaging findings, histopathological results, and treatment outcomes of 7 patients with AB.

METHODS

The study comprised 7 patients with pathologically proven AB who were surgically treated at Samsung Medical Center from November 1994 to January 2019. Clinicoradiological, histopathological, and surgical records were reviewed.

RESULTS

The patients included 5 girls (71.4%) and 2 boys (28.6%), with a median age of 13 years. All patients showed contrast enhancement on preoperative MRI: 5 ABs (71.4%) showed a concomitant solid and cystic appearance, and 2 (28.6%) demonstrated a solid appearance. ABs in 6 patients (85.7%) showed a well-circumscribed, characteristic "bubbly" appearance on T2-weighted MRI. Gross-total resection (GTR) was achieved in all cases (100%). Six patients (85.7%) were diagnosed with high-grade AB and 1 (14.3%) with low-grade AB. Six (85.7%) of the 7 patients received adjuvant treatment after resection, including 5 (83.3%) with AB who received chemotherapy and radiotherapy and 1 (16.7%) who received proton therapy alone. The median clinical follow-up duration was 96 months (range 48–189 months). Two patients experienced recurrence, and all patients in this series were alive at the last follow-up.

CONCLUSIONS

In this study, the clinicoradiological and histopathological features of AB were described. Based on the authors’ limited experience with 7 cases, resection with the goal of GTR is currently the mainstream treatment for AB, and adjuvant radiation treatment should be considered after surgery.
Uji Aktivitas Antioksidan Ekstrak Batang Tanaman Ungu (Graptophylum pictum (L.) Griff) Kabupaten Takalar Menggunakan Pereaksi DPPH Secara Spektrofotometri Visibel
Authors: Indrawati Andi , Baharuddin Suherman , Kahar Herlina
Published: February 2022

ABSTRAKAntioksidan adalah suatu sistem pertahanan dalam tubuh yang berguna untuk menangkal kerusakan sel tubuh yang disebabkan oleh radikal bebas. Berbagai kajian mengenai tanaman Graptophyllum pictum (L.) Griff dalam hal antioksidan, maka dalam penelitian ini akan dikembangkan pengujiannya sebagai antioksidan pada bagian batang dari tanaman Graptophyllum pictum (L.) Griff ini. Penelitian ini bertujuan untuk mengetahui dan menentukan ada tidaknya aktivitas antioksidan pada ekstrak batang tanaman daun Ungu (Graptophylum pictum (L.) Griff) Kabupaten Takalar dengan menggunakan pereaksi DPPH secara Spektrofotometri Visibel. Ekstrak batang tanaman daun Ungu dibuat dengan seri konsentrasi 50, 75, 100, 125 dan 150 ppm sedangkan vitamin C sebagai pembanding dibuat dengan konsentrasi 2, 4, 6, 8, dan 10 ppm. Tiap seri konsentrasi ditambahkan DPPH 40 ppm dan diinkubasi selama 30 menit, lalu diukur absorbansinya menggunakan pektrofotometri Visibel pada panjang gelombang 516.30 nm. Nilai IC50 yang diperoleh dari ekstrak batang tanaman daun Ungu sebesar 198,186 ppm sedangkan nilai IC50 vitamin C sebesar 2,819 ppm. Hasil penelitian menunjukkan bahwa ekstrak batang tanaman ungu (Graptophyllum pictum (L.) Griff) kabupaten Takalar memiliki aktivitas antioksidan lemah yang berada pada kisaran IC50 antara 151-200 ppm. Kata kunci : Antioksidan; Graptophylum pictum (L.) Griff; DPPH;  Spektrofotometri Visibel; IC50.ABSTRACTAntioxidants are a defense system in the body that is useful to ward off damage to body cells caused by free radicals. Various studies regarding the Graptophyllum pictum (L.) Griff plant in terms of antioxidants, so in this study will be developed as an antioxidant test on the stem of this Graptophyllum pictum (L.) Griff plant. This study aims to determine and determine the presence or absence of antioxidant activity in the stem extract of the purple leaf plant (Graptophylum pictum (L.) Griff) Takalar Regency using DPPH reagent by Visible Spectrophotometry. Purple leaf plant stem extracts were made with concentrations of 50, 75, 100, 125 and 150 ppm while vitamin C as a comparison was made with concentrations of 2, 4, 6, 8, and 10 ppm. Each concentration series was added with 40 ppm DPPH and incubated for 30 minutes, then the absorbance was measured using Visible Spectrophotometry at a wavelength of 516.30 nm. The IC50 value obtained from the stem extract of the Purple leaf plant was 198.186 ppm while the IC50 value for vitamin C was 2.819 ppm. The results showed that the stem extract of the purple plant (Graptophyllum pictum (L.) Griff) Takalar Regency had weak antioxidant activity in the IC50 range of 151-200 ppm.Keywords: Antioxidants; Graptophylum pictum (L.) Griff; DPPH;Visible Spectrophotometry; IC50.
Architectural and Harmonic Language coordinates in Sonata R6 by A. Soler
Authors:   Transilvania University of Braşov, IBĂNESCU Corina
Published: February 2022

"We are interested in the coordinates of the formal analysis of Soler’s Sonata R6 and, in this respect, in the following we are analysing its particular aspects that are related to the polyphonic exposition, with imitative entries of the voices, the originality of the tonal level and the place of the dance interlude, placed between the bridge and the idea II, as a cadence-dancing appendix of the bridge. In a shape diagram, we are showing the correspondences made at the tonal level. From the point of view of the harmonic structure, we are dwelling on the explicit and implicit developments in this sonata and the structure of the cadence. To conclude, the harpsichord manner is evident in the instrumental language used by Padre Antonio Soler in the construction of this musical piece."
About the Romanian opera for children and the choral moments
Authors:   George Enescu National University of Arts, Iași, RADU-ȚAGA Consuela
Published: February 2022

"The stories of the little ones were the starting point of some operasʼ creation. In the Romanian musical context the first operas for children appear in the first half of the 20th century. The composers opt for the connection with the folkloric treasure, connection made both at the level of literary language, and the musical one. The horizons, the accomplishments, and the conceptual maturations are the three creative stages in the evolution of this musical subgenre. The colorful world of the children calls for choral moments that fill the stage with characters, the choral landscape bringing in timbral diversity. As well as the solo part, the choral moments are meant for adult voices (mixed choir, men choir, and female choir) or for children choir (choir on equal voices, with 2, 3, or 4 voices). The simple forms of the folkloric music are present, couplet-refrain alternation led to a certain tendency to miniature. The popular melos is widely used, rhythmical figures are complex, and the effects of the orchestral timbre stimulate the optimistic character, the sweet lyricism, exuberance and cheerfulness."
Aurel Stroe and the religious themehis musical inspiration
Authors:   Transilvania University of Braşov, COROIU Petruța-Maria
Published: February 2022

Aurel Stroe had such a life vision in the early years of his composition career, which would do honour to the Romanian culture, being so unusual, so avant-gardist, for its time. Never sung, never published, I had the unique opportunity to see the manuscript of Melodramas and to hand it to the Library of the National University of Music in Bucharest. In the hope that the work will ever acquire its auditory version for which it was created, as a musicologist passionate about the creation of Master Stroe, I owe to bring to light a masterpiece of which many know nothing, especially as part of the field of religious music."
Operatic singing - Implications of technical means in changing vocal range
Authors:   Universitatea Nationala de Muzica Bucuresti, Romania, PETROVICI Alexandru
Published: February 2022

This study focuses on one of the most spectacular aspects opera singer’s evolution – the change of vocal subrange, or even of vocal range. We identified the most frequent reasons prompting artists to such changes, the prerequisites, the most frequent types of specific evolutions, the advantages and risks inherent to such choices. Besides physiological particularities, opera singers have available certain technical parameters which, when carefully adapted and fine-tuned, may lead to spectacular results. We presented several case studies reflecting the performance of famous artists, whose vocal technique illustrates the solutions and adjustments mentioned above.
Istvan Pavai: Hungarian Folk Dance Music of Transylvania – Review
Authors:   Transilvania University of Brasov, Romania, SZALAY Zoltan
Published: February 2022

Among the territories of the Carpathian Basin inhabited by Hungarians, Transylvania proved to be the most suitable field for the interethnic research of the music related to choreographic folklore. Most professional musicians in the rural areas, who receive regular or intermittent payment in money or other forms of remuneration, are of Romani ethnicity. The existence of musical instruments in the accompaniment of dances is richly documented since the 15th and 16th centuries. Hungarian ethnochoreology defines three types of musical accompaniments for the dances: rhythmic accompaniment (without melody), merely melodic accompaniment, and complex accompaniment created by the combination the first two types. A number of accompaniment types, considered ideal by local communities, had been established. These include the duos flute–gardon, fiddle–gardon (the gardon/gordunǎ being a stringed percussion instrument), fiddle or flute with koboz/cobzǎ, the trios made up of violin–cimbalom/ţambal–bass, or fiddle–kontra–double bass, the most common band consisting of a fiddle, a three-stringed kontra with flat bridge, and a bass (without cimbalom/ţambal). The rhythmic formulae provided by these instrumental ensembles specialized in accompaniment-playing constitute the musical support of the dances, at the same time they play an important role in defining the dance types. The three main types of rhythmic accompaniment are: slow dűvő/duva (in quarters), fast dűvő/duva (in eighths) and the estam (produced by eighth notes, alternately played by different instruments). The musical folklore of Transylvania inherited several principles of harmonization, such as the drone/ison principle, various forms of heterophony, polyphony focused on pivotal melodic notes, the accompaniment with mixtures of major triads, and the tonal-functional harmonization.
About Trois Pastorales for voice and piano by Romanian composer Filip Lazar
Authors:   Ovidius University of Constanta, Romania, BRATU Andreea
Published: February 2022

There are rarely highlighted works and stages of composition, part of the evolution of any composer, both in exegesis and in the auditory memory of the public. In consequence, a presentation and analysis by several perspectives (stylistic-musical, historical, social, monographic) is always a welcome restoration act. The creation of the Romanian composer Filip Lazăr is one of international interest, with diverse stylistic spacing, part of it, developed on the line of the European interwar Avant-garde or following an edification of the National Spirit in musical writing, not by cited fragments but by subtly integrating both the genre and the internal archaic structures of the folk song. In this study, I propose a brief look at Trois Pastorales for voice and piano, a cycle of songs coming out from a young master of music’s pen,composed a year before the separation of both the natal space and of the idyllic sound representations, in a modal-tonal space, enlarged with Romanian sound iridescences.
Representative Music of the Ministry of National Defense – decisive presence in the Romanian cultural and musical evolution
Authors:   Transilvania University of Brasov, Romania, IOAN Cristina Mioara
Published: February 2022

Symphony orchestra of blowers, Representative Music of the Ministry of National Defense is today the performance standard in terms of wind bands in our country. Through its activity carried out during seven decades, the band crowned the creative, interpretative, educational and cultural values of the military music bands from the Romanian garrisons and military units. Having a repertoire that exceeds two thousand works from almost all musical genres (hymns, marches, patriotic and military songs, fantasies, potpourri, overtures, processing of songs and folk games, symphonic poems, symphonies, jazz, Romanian light music, etc.) from the creations of Romanian and universal composers, the wind symphony orchestra supported a rich concert, ceremonial and protocol activity, representing Romania in numerous national and international festivals.
COMPARISON OF EFFECTIVENESS INVENTORY CONTROL OF EOQ METHOD WITH COMPANY METHOD IN STEEL MATERIAL FABRICATION KRAKATAU POSCO
Authors: Adam Gunawan , Tukhas Shilul Imaroh
Published: February 2022

PT. Krakatau Posco, is the largest steel manufacturing company in Southeast Asia that produces slabs and plates. This study aims to compare the effectiveness of controlling inventory of steel material fabrication workshop with the EOQ method and compared with the current method of the company in an effort to prevent the unavailability of such steel material fabrication. Inventory control using the EOQ method is expected to provide solutions for inventory control, and optimal ordering in order to obtain savings for inventory costs (Total Inventory Cost) at PT. Krakatau Posco. The method used is an interview and take the necessary data, then conduct an initial analysis using the ABC method to clarify the data that has been carried out at PT. Krakatau Posco, controls inventory using EOQ, determines safety stock, ROP and maximum inventory. By controlling the ordering and inventory also expected to provide significant savings for the company, by reducing inventory costs (Total Inventory Cost). The conclusion of this research is the EOQ method is the right method for controlling steel raw material fabrication to meet the production and repair processes at PT. Krakatau Posco and with this method the results of total inventory costs are also more efficient.
THE INFLUENCE OF KNOWLEDGE MANAGEMENT, SKILL, AND ATTITUDE ON EMPLOYEE PERFORMANCE
Authors: Hari Haji Wachyu , Madiistriyatno Harries , Widayati C. Catur , Usman Muhammad
Published: February 2022

This research was to determine to influence Knowledge Management, Skill, and Attitude on Employee Performance. The Object of This Research Are Employees Who Work At PT Sun Life Syariah of Jakarta. This study was conducted on 35 respondents using a causal research design. This test's analysis technique is descriptive analysis and test instruments in the form of Validation and Reliability Tests with Version 3.0 of the Smart PLS (Partial Least Square) software. This study indicates that Knowledge Management has a positive effect on Employee Performance, and Skill has a positive effect on Employee Performance. Attitude has a positive effect on Employee Performance at PT Sun Life Syariah of Jakarta.
EFFECT OF WORK MOTIVATION AND WORK DISCIPLINE ON PERFORMANCE OF BUREAU OF HUMAN RESOURCES OF THE POLDA METRO JAYA EMPLOYEES WITH WORK ENVIRONMENT AS INTERVENING VARIABLE
Authors: Suyukoh Hanafi , Djamil Mz Masydzulhak , Badawi Saluy Ahmad
Published: February 2022

This study aims to determine the effect of work motivation and work discipline on employee performance mediated by the work environment. The number of respondents involved in this study were 55 respondents, all respondents were employees of the Bureau of Human Resources Polda Metro Jaya. This study uses a quantitative approach. The data in this study are primary data obtained from the results of distributing questionnaires. The collected research data were then analyzed using the Partial Least Square (PLS) analysis technique with the help of the Smartpls program. Based on the results of the analysis in this study, it was found that Work Motivation, Work Discipline and Work Environment have a positive effect on performance, Work Motivation and Work Discipline have a positive effect on the Work Environment, Work environment can mediate the indirect effect of Work Motivation and Work Discipline on performance.
PROPOSED STRATEGY FOR PT RESIK NYAMAN SEJAHTERA PENETRATING CLEANING AND SECURITY SERVICE MARKET USING AHP METHOD
Authors: Raharja Indra , Hugo Prasetyo
Published: February 2022

The background of research is PT Resik Nyaman Sejahtera experiences several problems in the company: The company does not have clear targets, no marketing ,human resources and operations programs, unstable sales, high employee turnover. Therefore, the purpose of this study is to determine the factors that affect cleaning and security service business in Jakarta. To find out the company's strategy can still compete with current conditions. To formulate a business strategy company’s keeps the cleaning and security service business stay competitive in Jakarta. This research is a qualitative descriptive study by conducting interviews with owners, mapping the company's external and internal factors, weighting using Analytic Hierarchy Process, mapping company strategy with the Grand Matrix Strategy and Michael Porter's Five Generic Strategy. The results of this study provide the best strategies in marketing, operations, human resources, and corporate financial information systems in the next five years to achieve a competitive advantage.
EFFECT OF WORKLOAD AND WORK DISCIPLINE ON EMPLOYEE PERFORMANCE OF PT. XX WITH JOB SATISFACTION AS INTERVENING VARIABLE
Authors: Malau Thoho Sarjan , Kasmir Kasmir
Published: February 2022

The purpose of this study is to examine the effect of workload and work discipline on performance with job satisfaction as an intervening variable. The number of respondents involved in this study reached 107 respondents. All respondents are employees at PT. XX, both employees who occupy staff positions and employees who have positions as leaders/managers of the company. This research is a quantitative research. Research data obtained from the results of filling out the questionnaire. The research data was then analyzed through the Partial Least Square analysis technique with the SmartPLS program. The results of the analysis using the PLS analysis technique provide the following conclusions: (1) Workload has a negative effect on job satisfaction; (2) work discipline has a negative effect on job satisfaction; (3) Workload has a negative effect on performance; (4) Work discipline has a positive effect on performance; (5) Job satisfaction has a positive effect on performance; (6) Workload can affect performance through job satisfaction; (7) Work discipline can affect performance through job satisfaction.
RELATIONSHIP MODEL OF WORKLOAD, WORK MOTIVATION, AND WORK DISCIPLINE ON THE PERFORMANCE OF SHARIA BANKING EMPLOYEES IN JAKARTA
Authors: Nur Affini Dinar , Hikmah Perkasa Didin
Published: February 2022

This study was conducted to analyze the relationship model between workload, work motivation, and work discipline on the performance of banking employees in Jakarta. The research design is descriptive quantitative causal, where the object of this research is banking employees in Jakarta as many as 100 people. Data analysis using SPSS test tool will be tested for validity, reliability test, normality test, multicollinearity, heteroscedasticity, multiple linear regression, and hypothesis testing. In this study there are three hypotheses where the test results show that partially the workload, work motivation, and work discipline variables affect the performance of Islamic banking employees in Jakarta.
INFLUENCE OF PRODUCT QUALITY AND DESIGN ON THE PURCHASE DECISION OF HONDA CRV MOTOR VEHICLES AT PT. SINAR SENTOSA (CASE STUDY IN JAMBI CITY)
Authors: Mappedeceng Riko
Published: February 2022

This study aims to determine the effect of product quality and design on purchasing decisions on Honda CRV motor vehicles in Jambi City. The research methodology used is a quantitative method. The data used are secondary data and primary data. the population in this study were consumers of PT. SINAR SENTOSA who are consumers of CRV motorcycle users with a sample of 81 people. The analysis is regression test, T test and F test. The results of this study indicate that the application of product quality to consumers who have purchased a Honda CRV motor vehicle. product quality has a positive and significant effect on purchasing decisions for Honda CRV motor vehicles. expected PT. SINAR SENTOSA JAMBI will improve quality and design, in order to attract consumers to buy a Honda CRV motor vehicle.
A Critical Examination of Pakistan-US Relations
Authors: Ul Abiden Malik Zain , Min Xing Huang
Published: February 2022

Both countries worked together in a variety of areas, with the United States giving Pakistan with economic, social, and military assistance. Two of the most well-known treaties and pacts made between the two countries to develop and improve relations were CENTO and SEATO. Pakistan has always satisfied American wishes, whether it is the Afghan War or the War on Terror. Both conflicts had devastating implications for Pakistan, with the country losing both economic and human resources. As a result of drawing Pakistan into direct warfare, trust between the two countries has eroded. Pakistan is still suffering as a result of US wars and requires financial support to recover.
AN ANALYSIS OF THE PERFORMANCE OF THE AVIATION INDUSTRY IN INDONESIA: IN PANDEMIC PERIOD WITH SERVQUAL METHOD AND IMPORTANCE PERFORMANCE ANALYSIS
Authors: Sentosa Endri , Syafriana Effendi Maya , Rahma Diana Shinta
Published: February 2022

The aviation industry is one of the most globally affected industries by the COVID-19 pandemic. It employs millions of people and supports tens of millions of others, as well as being the nerve center of international business and tourism. The losses of aviation industry will extend to its branches industries. The determination of policies that are not in favor of the industry related to the Avtur VAT, disharmony between ministries has caused the impact of this covid-19 adding heavy burden in industry sector. High operational costs, aircraft leasing, maintenance and others will be higher if the exchange rate also increases. This study aims to determine the analysis of the performance of  national aviation industry due to the Covid19 pandemic. The results of this study are expected to be used as input in formulating policies in order to increase economic value in the aviation industry. Method of research which was done, namely comparing literature reviews from journals that discussed airlines with the use of Servqual theory and applied the Importance Performance Analysis method, and the authors made the descriptive analysis. The results of the study showed that covid 19 had a significant impact on the aviation industry, and the results of the performance analysis suggested that in order to survive in Covid-19 condition, the government needed to involve to provide a stimulus to the aviation industry.