bluuebunny/crossref_metadata_2025 huggingface dataset:
EFISIENSI KERJA WHEEL LOADER KOMATSU WA 200-5 DI PABRIK BRIKET TANJUNG ENIM PT. BUKIT ASAM Tb
Authors: Derisman Aken , Sarmidi  , Zikri
Published: July 2022

Based on business development in the Tanjung Enim Briquette work unit related to the production of Activated Carbon and Carbon Anodes, to support production, work efficiency is needed on the heavy equipment unit, namely Wheel Loaders. In addition, by obtaining work efficiency data, it is possible to evaluate the work of the wheel loader in its operations at the Tanjung Enim Briquette Factory PT. Bukit Asam Tbk. So that there is an increase and optimization of the work/operational quality of the Wheel Loader to achieve the production target. At the Tanjung Enim Briquette factory itself the wheel loader unit plays an important role in supporting the production of Carbonized Briquettes, Non-Carbonized and serves various types of work in the briquette factory such as filling hopper, material mixing or blending, transporting clay and loading raw coal stock. The data collection process for 16 days started on August 2 until August 27, 2021 with the average wheel loader working efficiency of 86.12% in the good category.
UJI KUALITAS IKAN KEMBUNG (Rastrelliger kanaguarta) ASAP YANG DIRENDAM DENGAN LARUTAN KULIT MANGGIS (Garcinia mangostana linn) SELAMA PENYIMPANAN
Authors: Ladiku Fitriyanti , Une Suryani , Liputo Siti Aisa
Published: July 2022

Tujuan  dalam penelitian ini adalah untuk mengetahui pengaruh pengasapan ikan kembung( Rastrelliger kanagurta ) dengan perendaman larutan kulit manggis terhadap kualitas ikan asap dan Organoleptik. Penelitian ini menggunakan Rancangan Acak Lengkap (RAL) 1 faktor yaitu variasi lama perendaman (30 menit, 45 menit dan 60 menit). Perlakuan terbaik diperoleh adalah perendaman 30 menit yaitu memiliki nilai untuk Total Plate Count TPC berkisar antara 1,8 x 103 – 2,6 x 105, untuk nilai Total Volatile Substance Nitrogen (TVB-N) berkisar antara 28,68 – 31,6 mgN/100 gr, untuk nilai kadar protein berkisar antara 28,05 – 32,78%. Sedangkan hasil uji hedonik perlakuan terbaik terdapat pada lama perendaman 30 menit untuk warna berkisar antara 4,23 – 4,70, untuk rasa berkisar 4,20 – 4,70, serta untuk aroma berkisar antara 4,30 – 4,47.
Directors’ Conflict of Interest and Its Implication for the Sustainability of a Company
Authors: OLUGASA OLUBUKOLA , ABIRI - FRANKLIN SOPHIA , OLANREWAJU DEJI
Published: July 2022

Events on the Boards of directors in Nigeria have exposed diverse cases of conflict of interest and non-disclosure. Activities of some directors reveal that they do not know the boundaries of their allegiance to the companies that appointed them. This paper examined the role of directors' viz-a-viz conflict of interest and how it affects the sustainability of the companies. The doctrinal method was used to analyze the principles of corporate governance as it is related to the conflict of interest of those who are involved in the management. With the use of primary and secondary sources, the authors discussed the legal provisions addressing issues on conflict of interest, and the impact and implication of conflict of interest related to the organizations, the economy, and corporate sustainability. The paper found that lack of adherence to the provision of corporate governance framework had led to the pervasive cases of non-disclosure, conflict of interest, criminal liability, and extinction of the companies in extreme cases. This paper also offers recommendations for curbing the menace of conflict of interest in order to ensure corporate sustainability.
Structural Parameters and Possible Association of the Ultra-faint Dwarfs Pegasus III and Pisces II from Deep Hubble Space Telescope Photometry
Authors: Richstein Hannah , Patel Ekta , Kallivayalil Nitya , Simon Joshua D. , Zivick Paul , Tollerud Erik , Fritz Tobias , Warfield Jack T. , Besla Gurtina , van der Marel Roeland P. , Wetzel Andrew , Choi Yumi , Deason Alis , Geha Marla , Guhathakurta Puragra , Jeon Myoungwon , Kirby Evan N. , Libralato Mattia , Sacchi Elena , Sohn Sangmo Tony
Published: July 2022

We present deep Hubble Space Telescope (HST) photometry of the ultra-faint dwarf (UFD) galaxies Pegasus III (Peg III) and Pisces II (Psc II), two of the most distant satellites in the halo of the Milky Way (MW). We measure the structure of both galaxies, derive mass-to-light ratios with newly determined absolute magnitudes, and compare our findings to expectations from UFD-mass simulations. For Peg III, we find an elliptical half-light radius of

a

h

=
1
.′

88

−
0.33

+
0.42

(

118

−
30

+
31

pc) and

M

V

=
−

4.17

−
0.22

+
0.19

;

for Psc II, we measure

a

h

=
1
.′

31

−
0.09

+
0.10

(69 ± 8 pc) and

M

V

=
−

4.28

−
0.16

+
0.19

. We do not find any morphological features that indicate a significant interaction between the two has occurred, despite their close separation of only ∼40 kpc. Using proper motions (PMs) from Gaia early Data Release 3, we investigate the possibility of any past association by integrating orbits for the two UFDs in an MW-only and a combined MW and Large Magellanic Cloud (LMC) potential. We find that including the gravitational influence of the LMC is crucial, even for these outer-halo satellites, and that a possible orbital history exists where Peg III and Psc II experienced a close (∼10–20 kpc) passage about each other just over ∼1 Gyr ago, followed by a collective passage around the LMC (∼30–60 kpc) just under ∼1 Gyr ago. Considering the large uncertainties on the PMs and the restrictive priors imposed to derive them, improved PM measurements for Peg III and Psc II will be necessary to clarify their relationship. This would add to the rare findings of confirmed pairs of satellites within the Local Group.
Investigating the Nature of the Luminous Ambiguous Nuclear Transient ASASSN-17jz
Authors: Holoien Thomas W.-S. , Neustadt Jack M. M. , Vallely Patrick J. , Auchettl Katie , Hinkle Jason T. , Romero-Cañizales Cristina , Shappee Benjamin. J. , Kochanek Christopher S. , Stanek K. Z. , Chen Ping , Dong Subo , Prieto Jose L. , Thompson Todd A. , Brink Thomas G. , Filippenko Alexei V. , Zheng WeiKang , Bersier David , Bose Subhash , Burgasser Adam J. , Channa Sanyum , de Jaeger Thomas , Hestenes Julia , Im Myungshin , Jeffers Benjamin , Jun Hyunsung D. , Lansbury George , Post Richard S. , Ross Timothy W. , Stern Daniel , Tang Kevin , Tucker Michael A. , Valenti Stefano , Yunus Sameen , Zhang Keto D.
Published: July 2022

We present observations of the extremely luminous but ambiguous nuclear transient (ANT) ASASSN-17jz, spanning roughly 1200 days of the object’s evolution. ASASSN-17jz was discovered by the All-Sky Automated Survey for Supernovae (ASAS-SN) in the galaxy SDSS J171955.84+414049.4 on UT 2017 July 27 at a redshift of z = 0.1641. The transient peaked at an absolute B-band magnitude of M

B,peak = −22.81, corresponding to a bolometric luminosity of L
bol,peak = 8.3 × 1044 erg s−1, and exhibited late-time ultraviolet emission that was still ongoing in our latest observations. Integrating the full light curve gives a total emitted energy of E
tot = (1.36 ±0.08) × 1052 erg, with (0.80 ± 0.02) × 1052 erg of this emitted within 200 days of peak light. This late-time ultraviolet emission is accompanied by increasing X-ray emission that becomes softer as it brightens. ASASSN-17jz exhibited a large number of spectral emission lines most commonly seen in active galactic nuclei (AGNs) with little evidence of evolution. It also showed transient Balmer features, which became fainter and broader over time, and are still being detected >1000 days after peak brightness. We consider various physical scenarios for the origin of the transient, including supernovae (SNe), tidal disruption events, AGN outbursts, and ANTs. We find that the most likely explanation is that ASASSN-17jz was a SN IIn occurring in or near the disk of an existing AGN, and that the late-time emission is caused by the AGN transitioning to a more active state.
Independent Discovery of a Nulling Pulsar with Unusual Subpulse Drifting Properties with the Murchison Widefield Array
Authors: McSweeney Samuel J. , Bhat N. D. Ramesh , Swainston Nicholas A. , Smith Keegan R. , Kudale Sanjay , Hancock Paul , Straten Willem van , Dai Shi , Shannon Ryan M. , Tingay Steven J. , Johnston-Hollitt Melanie , Kaplan David L. , Walker Mia
Published: July 2022

We report the independent discovery of PSR J0026-1955 with the Murchison Widefield Array (MWA) in the ongoing Southern-sky MWA Rapid Two-metre pulsar survey. J0026-1955 has a period of ∼1.306 s, a dispersion measure of ∼20.869 pc cm−3, and a nulling fraction of ∼77%. This pulsar highlights the advantages of the survey's long dwell times (∼80 minutes), which, when fully searched, will be sensitive to the expected population of similarly bright, intermittent pulsars with long nulls. A single-pulse analysis in the MWA's 140–170 MHz band also reveals a complex subpulse drifting behavior, including both rapid changes of the drift rate characteristic of mode switching pulsars, as well as a slow, consistent evolution of the drift rate within modes. In some longer drift sequences, interruptions in the otherwise smooth drift rate evolution occur preferentially at a particular phase, typically lasting a few pulses. These properties make this pulsar an ideal test bed for prevailing models of drifting behavior such as the carousel model.
Magnetospheric Multiscale Mission Observations of Lower-hybrid Drift Waves in Terrestrial Magnetotail Reconnection with Moderate Guide Field and Asymmetric Plasma Density
Authors: Chen Z. Z. , Fu H. S. , Cao J. B. , Cui J. , Lu Q. M. , Li W. Y. , Dong X. C. , Xu Y. , Guo Z. Z. , Wang Z. , Liu Y. Y.
Published: July 2022

Utilizing high-resolution data from the Magnetospheric Multiscale mission, we present new observations of lower-hybrid drift waves (LHDWs) in terrestrial magnetotail reconnection with guide field levels of ∼70% and asymmetric plasma density (N
high/N
low ∼ 2.5). The LHDWs, driven by lower-hybrid drift instability, were observed in correlation with magnetic field and density gradients at separatrices on both sides of the reconnection current sheet. The properties of the LHDWs at both sides of the separatrices are different: (1) At high-density side separatrices, the LHDWs with wavelength kρ
e ∼ 0.41 propagated away from the X-line mainly in the L–M plane; (2) at the low-density side separatrices, the LHDWs with wavelengths kρ
e ∼ 0.76 and kρ
e ∼ 0.35 propagated mainly along the outflow direction and current sheet normal. It is also found that the perpendicular magnetic field fluctuations were comparable to the parallel component. Wave potential of the LHDWs was 20% ∼ 35% of the electron temperature. The LHDWs contributed to electron demagnetization and energy dissipation. Our study can promote understanding of properties of LHDWs during magnetic reconnection.
The Isotropic γ-ray Emission above 100 GeV: Where Do Very High-energy γ-rays Come From?
Authors: de Menezes Raniere , D’Abrusco Raffaele , Massaro Francesco , Buson Sara
Published: July 2022

Astrophysical sources of very high energy (VHE; >100 GeV) γ-rays are rare, since GeV and TeV photons can be only emitted in extreme circumstances involving interactions of relativistic particles with local radiation and magnetic fields. In the context of the Fermi Large Area Telescope (LAT), only a few sources are known to be VHE emitters, where the largest fraction belongs to the rarest class of active galactic nuclei: the blazars. In this work, we explore Fermi-LAT data for energies >100 GeV and Galactic latitudes b > ∣50°∣ in order to probe the origin of the extragalactic isotropic γ-ray emission. Since the production of such VHE photons requires very specific astrophysical conditions, we would expect that the majority of the VHE photons from the isotropic γ-ray emission originate from blazars or other extreme objects like star-forming galaxies, γ-ray bursts, and radio galaxies, and that the detection of a single VHE photon at the adopted Galactic latitudes would be enough to unambiguously trace the presence of such a counterpart. Our results suggest that blazars are, by far, the dominant class of sources above 100 GeV, although they account for only

22.8

−
4.1

+
4.5

% of the extragalactic VHE photons. The remaining

77

−
4.5

+
4.1

%

of the VHE photons still have an unknown origin.
The missing anatomy of the living coelacanth, Latimeria chalumnae (Smith, 1939)
Authors: Johnston Peter
Published: July 2022

Anatomical features that have not been previously described in Latimeria were sought in histological section series, tissue-stained microCT scans, MRI scans, and synchrotron scan series. The spiracular organ, ultimobranchial endocrine gland, and m. cucullaris were identified in the expected locations. In addition, a muscle arising on the medial side of the pectoral girdle is identified and compared with a muscle in a similar location that attaches to the cranial rib in lungfish; these are proposed as homologues of the tetrapod m. omohyoideus.

These findings are placed in evolutionary context by comparison with selected other groups of fish, lungfish and tetrapods. The position of Latimeria as a key taxon in the fish-to-tetrapod transition is emphasised by these findings, and the findings have potential to inform research on cranial structure in extinct taxa.
Antineutrophil Cytoplasm Antibody–Associated Vasculitides Valvular Impairment: Multicenter Retrospective Study and Systematic Review of the Literature
Authors: Jeantin Lina , Lenfant Tiphaine , Bataille Pierre , de Boysson Hubert , Cathébras Pascal , Agard Christian , Faguer Stanislas , Poindron Vincent , Ruivard Marc , Silva Nicolas Martin , Monge Matthieu , Guillevin Loic , Puéchal Xavier , Terrier Benjamin , Dechartres Agnès , Charles Pierre
Published: July 2022

Objective

While myocardial impairment is a predictor of poor prognosis in antineutrophil cytoplasm antibody (ANCA)-associated vasculitides (AAV), little is known about valvular involvement. This study aims at describing the clinical presentation, management, and outcome of endocarditis associated with AAV.

Methods

We conducted a multicenter retrospective study in centers affiliated with the French Vasculitis Study Group. We included patients with granulomatosis with polyangiitis (GPA), microscopic polyangiitis (MPA), or eosinophilic GPA with endocardial impairment. A systematic review was then performed through PubMed, Embase, and Cochrane Library from inception up to September 2020.

Results

The retrospective cohort included 9 patients (82%) with GPA, 1 (9%) with MPA, and 1 (9%) with unclassified AAV. Clinical presentation included acute valvular insufficiency (n = 7, 64%), cardiac failure (n = 3, 27%), dyspnea (n = 3, 27%), and no symptoms (n = 2, 18%). The aortic valve was the most frequently affected (n = 8/10, 80%), and vegetations were noted in 4 of 10 patients (40%). Six patients (55%) underwent surgical valvular replacement. No death from endocarditis was reported. The systematic review retrieved 42 patients from 40 references: 30 (71%) had GPA, 21 (50%) presented with vegetations, the aortic valve (n = 26, 62%) was the most frequently involved. Valvular replacement was required in 20 cases (48%) and 5 patients (13%) died from the endocarditic impairment.

Conclusion

Endocarditis is a rare and potentially life-threatening manifestation of AAV. Acute valvular insufficiency may lead to urgent surgery. Implementing transthoracic echocardiography in standard assessment at baseline and follow-up of AAV might reduce the delay to diagnosis and allow earlier immunosuppressive treatment before surgery is needed.
Trust Evaluation and Prioritization of Cloud Service Providers Using MADM Methods
Authors: Pawar Suruchi , Paulson Eunice Grace , Badgujar Prajakta Sunil , Deshpande Shilpa
Published: July 2022

With the increasing market for cloud computing and the variety of Cloud Service Providers (CSPs) becoming available, making an appropriate choice of a CSP turns out to be challenging for the consumer. In order to cater to the user’s specific needs of quality, the services provided need to be user-centric. Trust plays an important role in the selection of cloud providers by users. This paper proposes CSP Trust evaluation, Prioritization and Recommendation System (CTPRS) for evaluating the trust of CSPs based on Quality of Service (QoS) parameters, and accordingly ranking and recommending them. MADM methods, namely ARAS, DEA, and GRA are used to evaluate trust by considering the user's preferences across multiple QoS parameters of CSPs. Comparative analysis of all three MADM methods is done using rank conformance, rank correlation, sensitivity, and computational complexity analysis. Experimental results demonstrate that GRA is superior to the other two methods. Thus, GRA is found to be the most suitable method and is therefore used for evaluating trust in CTPRS.
The Impact of COVID-19 on Hotel Guests' Sustainable Practices
Authors: Memarzadeh Faranak , Jahani Shiva
Published: July 2022

The hotel industry is one of the sectors that is heavily affected by the COVID-19 pandemic. Compensating for this lost revenue requires understanding which aspects of guests' priorities have changed, including their feelings about sustainable practices. Drawing from an online survey with 250 adults who were at least 18 years of age, described themselves as familiar with sustainable practices, and stated they had stayed in a hotel both before and during the pandemic, this study finds that the pandemic had a significant impact on their attitudes towards sustainable practices. Although they believe that hotels' adopted protocols are adequate to protect them from COVID-19, they do not intend to adopt sustainable practices in the pandemic era.
Management Model for University-Industry Linkage Based on the Cybernetic Paradigm
Authors: Morales Yamilet Nayeli Reyes , Suárez-Rocha Javier
Published: July 2022

This paper presents a management model that describes the attributions of the different actors that work together in the realization of university-industry linkage projects, as well as the relations between these actors. The construction of the model was carried out based on the systemic and cybernetic approaches. The Management Model for University-Industry Linkages was used in the implementation of seven projects, which allowed the validation of its potential as a tool to monitor and regulate the process of project execution, guaranteeing the satisfactory fulfillment of the established objectives. One of the limitations of the model is that its functional structure responds to the management of the institution's linkage projects only for the knowledge field of engineering and that these projects are carried out through a system or organization linking the university with the industry, which can lead to duplication of activities or lack of coordination between the areas that carry out linking activities for the entire educational institution.
Interaction of AZ91 Magnesium Alloy with Ceramic Shell during Investment Casting
Authors: Gejdoš Pavel , Juliš Martin , Klakurková Lenka , Dyčka Martin
Published: July 2022

The investment casting into a ceramic shell of magnesium alloys brings several difficulties, one of which is the high reactivity of some magnesium alloys with the often-used ceramic shells. In the group of these potentially problematic alloys belong the AZ91 magnesium alloy too. This paper aims to describe the interaction of magnesium melt with ceramic shell, especially from the point of view of manufacturing problems on the surface of emerging defects with reduced corrosion resistance. Samples of AZ91 magnesium alloy castings in as-cast and heat-treated were microstructurally evaluated. Surface defects were analysed using light and scanning electron microscopy, including their EDX chemical microanalysis.
Laser Surface Hardening of Graphite Cast Iron
Authors: Horník Jakub , Krčil Jan , Mára Vladimír , Mores Antonín
Published: July 2022

Two types of graphite cast iron are evaluated. The effect of laser surface hardening is compared using metallographic analysis of the microstructure and measurement of hardness profile. Conditions of the hardening were the same for both analyzed materials. The alloys that were compared are: cast iron with lamellar graphite EN GJL-200 and cast iron with nodular graphite EN GJS-700 CuNi. Microstructure of tested cast irons was pearlitic-ferritic. Laser surface heat treatment caused formation of martensitic layer. The depth and structural compositions of hardened layers do differ. In the case of gray cast iron the higher hardened depth was achieved and in the case of ductile cast iron the higher hardness was observed.
The Evaluation of Ti-24Nb-8Ta-4Sn Alloy Prepared by 3D Printing
Authors: Krčil Jan , Mára Vladimír , Šimota Jan
Published: July 2022

The most common titanium alloy used in combination with additive manufacturing is Ti-6Al-4V ELI. On the other hand, the 3D printing of β-Ti alloys is still in the stage of development of both materials and their treatment. The newly developed biomedical Ti alloys are often containing Nb, Ta, Zr. These alloys are showing very good values in terms of biocompatibility and corrosion resistance while their elastic modulus may be in the range of 30-70 GPa. The printing of these alloys is however limited by their relative novelty. Powders are not yet available through traditional commercial ways. In this work, Ti–24Nb–8Ta–4Sn specimens prepared by the selective laser melting (SLM) method were used. The porosity was evaluated by two methods: area porosity evaluated by image analysis on metallographic specimens and volume porosity evaluated by micro-computed tomography (μCT). The microstructure was observed using both light and scanning electron microscopy (SEM). The SEM was as well used for energy dispersive spectroscopy (EDS) for chemical analysis and the analysis of crystallographic orientation was conducted using the method of electron backscattered diffraction (EBSD).
Structure and Mechanical Properties of Welded Joints of Large Steel Forgings for Nuclear Power Plants of MIR 1200 Type
Authors: Hermanova Sarka , Kosňovská Jana , Kander Ladislav
Published: July 2022

The paper deals with research, development and verification of production technology of selected welded joints for pressure vessels located in primary circuit of nuclear power plants type MIR 1200. Effects of various welding technologies on mechanical and fracture properties were studied. Four types of weld joints made of 10GN2MFA steel grade were prepared for experimental programme consisted of testing of conventional mechanical (tensile and impact tests) as well as fracture toughness and low-cycle fatigue tests and also stress corrosion cracking test in water environment. Effect of elevated operating temperature on material properties was evaluated, too.
Investigation of Hybrid Modification of Eco-Friendly Polymers by Humic Substances
Authors: Lebedev Vladimir , Miroshnichenko Denis , Bilets Daria , Mysiak Vsevolod
Published: July 2022

Research on investigation of hybrid eco-friendly polymers modificated by humic substances are given in this article. The purpose of the research is to investigate a hybrid modification of eco-friendly polymers of polylactic acid by humic substances, it was found that the mechanism of hybrid modification in the matrix synthesis of the polylactic acid-humic substances system indicates an intermolecular bond between polylactic acid and humic substances, at the same time, due to increased crystallization and the emergence of intermolecular and ester bonds in the formation of more rigid mesh structure in the system polylactic acid-humic substances is increasing the mechanical properties of such materials. It was found that the increase in the impact strength and the breaking stress during bending in the polylactic acid-humic substances system in the hybrid modification occurs, while the optimal content of humic substances in the polylactic acid-humic substances systems is 0.5 % by mass.
Additional Strengthening of “Screper” Jewelry Tool Using Friction
Authors: Volkov Oleg , Kraevska Zhanna , Vasilchenko Alexey , Hannichenko Tetiana
Published: July 2022

This study is aimed at strengthening the working surfaces of the jewelry tool - scraper. This tool is used for fine cutting work. The object of research is a method of additional thermofrictional hardening of samples of jewelry tool - scrapers made of carbon steel tool grade U8A. In the course of work the complex of metallographic, mechanical and analytical researches of samples in an initial condition after hardening and low-temperature release which includes is carried out which includes:1) preparation of samples in the form of plates and their preliminary heat treatment;2) surface thermofrictional strengthening (STS);3) conducting metallographic analysis of samples; measuring the microhardness and depth of the layer with a changed cross-sectional structure of the samples after STS;4) analysis of the influence of STS on changes in the structure and properties of steel on the basis of the obtained results, as well as identification of the degree of its strengthening and the role of deformation.The methodology of experimental researches is presented. Photographs of samples and some equipment at different stages of the study are given. Data on the distribution of microhardness, photographs of microstructures in cross section of samples after additional strengthening are presented. The efficiency of strengthening of samples after use of additional processing is shown.
Diagnostic dilemma of Wegener’s granulomatosis and its effective management: A rare case report and update
Authors: Modi Mahavir , Devi Kaumudi
Published: July 2022

Granulomatosis with Polyangiitis (GPA) is an uncommon condition belongs to the group of ANCA-associated necrotizing vasculitides. It is characterized by necrotizing granulomatosis of upper and lower respiratory system with coexisting glomerulonephritis. Its signs and symptoms are largely varied due to a wide spectrum of involvement sites. In the present case report, we describe a case of 26-year-old female presented to our centre with history of bilateral ear discharge, earache, and dry cough with a deviated mouth angle to left. Diagnostic work up was done and patient was treated with pulse methylprednisolone, plasmapheresis, and rituximab. Timely diagnosis and prompt initiation of the treatment has prevented the GPA progression and helped the patient to improve quickly. Currently, the patient is doing well and is in remission.
Neuropsychological evaluation of cognitive disorders in children after COVID-19
Authors: Troitskaya Lubov A. , Plotnikova Inga A. , Avakyan Georgy G. , Erokhina Vera A. , Badalyan Oganes L. , Muraveva Antonina V. , Zelentsova Vera L. , Khodko Oksana K. , Safarova Sabina T. , Shirokova Evgenia I. , Rusina Ekaterina A. , Sanina Natalia P. , Terentev Kirill V. , Rachin Andrey P.
Published: July 2022

The article presents the results of neuropsychological remote and face-to-face testing of 25 children aged 12 to 17 years in the nearest (during and 1-2 weeks after the treatment) and later period (2-12 months) after COVID-19 infection with predominant respiratory tract infection, organized in Ekaterinburg in the State Autonomous Institution "Children's Hospital № 8". Indication of family contact with patients with a new coronavirus infection was found in all patients, a positive nasopharyngeal swab for SARS-CoV-2 RNA by PCR was found in 58%, non-focal neurological complaints were found in 54% of children. The control group consisted of 25 pupils of Moscow comprehensive schools (14 girls and 11 boys) aged between 12 and 16 years who were examined before the pandemic. The methods included: investigation of the kinesthetic, spatial, dynamic, graphic praxis; auditory-motor coordination; visual, object-constructive gnosis; auditory-speech, visual memory; voluntary attention; thinking. Significant differences with the results of neuropsychological tests performed in children in the control group were found, allowing us to assert impairment of memory, attention, visual gnosis, visual-spatial function, kinesthetic and dynamic praxis, verbal and non-verbal component of thinking. According to A.R. Luria's theory, the topic of the disorders involves the temporo-parieto-occipital, mediobasal, frontotemporal parts of the brain, the reticular formation and limbic structures. This necessitates the development of corrective educational programs and an in-depth diagnostic algorithm that determines the morphological substrate of cognitive disorders in children, who have undergone COVID-19.
Klinefelterʼs syndrome with retroperitoneal teratoma masquerading as adrenal mass: A very rare occurrence in adults
Authors: Almazrouei Raya , El-Houni Ali , Houcinat Yamina , Ghellai Ali
Published: July 2022

The association of chromosomal disorders with various neoplasms is well established. We report a case of 36 years old man who was referred for preoperative evaluation of functional status of “presumed” right adrenal mass. The patient was found to have clinical features of hypogonadism and further investigations confirmed the diagnosis of Klinefelter’s Syndrome. The patient proceeded to surgery and pathological examination of the removed mass revealed a mature retroperitoneal teratoma abutting the adrenal gland. This case demonstrates that patients with KS are at increased risk of extragonadal germ cell tumors unusual sites from the mediastinum and brain. Retroperitoneal teratoma in the adrenal gland region can be easily confused with adrenal related mass.
Role of myofascial release therapy on pain and lumbar range of motion in mechanical back pain: An exploratory investigation of desk job workers
Authors: Balasubramaniam Arun , Mohangandhi Velusamy , Sambandamoorthy Arun Kumar
Published: July 2022

Background: Low back pain is the most common cause of work related disability in persons aged less than 45 years. Workers who sit in front of the computer for more than 40 hours per week end up with low back pain. Bad positioning of the body parts in a single day doesn’t make poor postures, whereas adaptation of the incorrect posture for a longer duration results in weak muscles and postural problems. Abnormal posture results in pain, disability and muscle weakness. Most of the management of low back pain focuses on the rehabilitation of the pain and very few studies focus on work station corrections. Aim: This study aims to find out the effect of work station modification with Myofascial release therapy on pain and lumbar flexion range of motion in mechanical low back pain in desk job workers. Methods: Forty subjects were included using simple random sampling method, subjects were chosen following an inclusion and exclusion criteria. Group A, underwent myofascial release therapy, whereas group B underwent myofascial release therapy technique with work station modification. The outcome measures were pain and range of motion of lumbar spine, which measured using visual analogue scale and modified schober’s method. Student ‘t’ test was used to find out the difference between the groups. Results: This study showed that there was a significant difference between the group A & group B. Conclusion: The study concludes that the work station modification along with myofascial release therapy was very effective in improving range of motion, and reducing pain.
Vitamin D deficiency and insufficiency in patients attending a general hospital in Dubai, United Arab Emirates
Authors: Abdelgadir Elamin , Bashier Alaaeldin , Kathamuthu Raja , Bashiri Safeia , Alawadi Fatheya
Published: July 2022

Background: Vitamin D deficiency is a common medical problem, especially in the gulf region of the Middle East. The prevalence in several studies has exceeded 50% and being more frequent among females. Objective: We assessed the prevalence of vitamin D deficiency in patients attending a general hospital in both men and women in different age groups. Methods: Vitamin D level data for patients who attended Dubai hospital in the period between 2008 and 2012 were examined retrospectively. The serum 25(OH) D levels were crosschecked in patients' charts and the hlaboratory electronic database. Patients with incomplete medical records, those already on treatment with vitamin D, and patients with contradicting results in the medical files and the electronic database has been excluded. Data were analysed using descriptive analysis relating vitamin D levels to age, gender, and ethnicity. Results: The total number included was 2836 patients. 81% of them had 25 (OH) D levels of <30 ng/ml. About 76.4% (n=2166) of the studied group were females. There was no difference in prevalence between males and females. Arab ethnicity was associated with more marked vitamin D deficiency and less sufficiency. Conclusion: We conclude that vitamin D deficiency is a considerably major health problem in the emirate of Dubai. Higher awareness among healthcare providers and the community is needed for screening and treatment necessity.
Logistic regression analysis to predict mortality risk in COVID-19 patients from routine hematologic parameters
Authors: Bhandari Sudhir , Shaktawat Ajit , Tak Amit , Patel Bhoopendra , Shukla Jyotsna , Singhal Sanjay , Gupta Kapil , Gupta Jitendra , Kakkar Shivankan , Dube Amitabh
Published: July 2022

Background: The triage of coronavirus-19 patients into various strata based on some prognostic indicator might prove a utilitarian strategy in the management of epidemic. The goal of health-care facilities is optimization of the use of medical resources. The present study aimed to develop a predictor model of mortality risk from routine hematologic parameters. Patients and Methods: In this retrospective case–control study, seventy survivors (n = 47) and nonsurvivors (n = 23) were enrolled who were laboratory-confirmed coronavirus disease 2019 (COVID-19) cases from SMS Medical College, Jaipur (Rajasthan, India). The clinical and routine blood profile of the survivors and nonsurvivors was recorded. A logistic regression model was fitted with step-wise method to the above dataset with dependent variable such as survivor or nonsurvivor and independent variables such as age, sex, symptoms, random blood glucose, and complete blood count. The best model was selected on the basis of Akaike information criterion. Results: It was observed that differential neutrophil count (%) and random blood sugar (RBS in mg/dL) are the statistically significant regressors (P < 0.05). The performance metrics of the model with 5-fold cross-validation showed area under the receiver operating characteristic curve, sensitivity, specificity, and validation accuracy to be 0.95, 90%, 92%, and 70%, respectively. The cutoff probability comes out at 0.30 for the outcome (nonsurvivor as success). Conclusion: The study concludes that differential neutrophil count and RBS levels can be used as early screening tools of mortality risk in COVID-19 patients and they assist in further patient management.
The causality link between financial development and economic growth in Mexico
Authors: Benmazou Mohamed Zakaria
Published: July 2022

To assess the nexus between financial development and economic growth in Mexico, we used an ARDL model over the period of 1978-2019. Domestic credit to the private sector is used as a proxy for the banking sector development; value of shares traded is used as a proxy for the financial market development. In the long-run, we find that the banking sector development has a positive impact on growth; an increase by 1% in the banking sector development causes an improvement of 0.098% in growth. Moreover, we find a negative relationship between the stock market development and growth; where an increase by 1% in the stock market development causes a decrease by 0.046% in growth. Findings from this paper suggest that Mexican authorities should accelerate in priority the financial reforms of the stock market, and reinforce the regulatory environment in order to stimulate economic growth in the long-run.
DEA in the evaluation of efficiency of the perimeters of development in different agricultural regions
Authors: Hanafi Wassila , Bedrani Slimane
Published: July 2022

The purpose of this research is the ex-post evaluation of the efficiency of agricultural development projects for the period 2000-2009. The analysis had been based upon a random sample of 244 agricultural perimeters spread over 15 departments among which 75 perimeters are located in the mountainous zone, 98 in the steppe zone and 51 in the Sahara zone. The DEA (Data Envelopment Analysis) method had been used to calculate the efficiency of development projects. The selected outputs represent the number of developed hectares, and the number of created jobs, the input, will be represented by the total amount of expenses. The analysis uses an output-oriented approach with either constant or variable scale models. Our analysis shows that only the 9 perimeters (3 in the mountains, 4 in the steppe and 2 in the Sahara) which have reached the DEA efficiency boundary, are operating at their optimal scale. The results have proved that although the efficiency has a low score for the three agro-ecological zones, they can reach an increase in production of about 77% and 62 % on average, depending on whether we suppose the constant or the variation in return having better use of the invested capital and higher returns.
The impact of the increase in the price of hydrocarbons on the Algerian economy in the context of the Dutch disease: a calculable general equilibrium model
Authors: Gueddal Zinedine
Published: July 2022

The term “Dutch disease” is not new, but still remains one of the hot topics that reappear in Algeria each time the price of hydrocarbons decreases or increases. Our study starts from an assumption that the rise in the price of hydrocarbons will always have negative effects on the Algerian economy due to the deterioration of certain productive activities, in addition to the rise of the real exchange rate, the creation of a consumer society and the migration of labor to expanding sectors, all of which are synonymous with the Dutch disease. By using the calculable general equilibrium model, and the inclusion of oil rent as one of the production factors which is redistributed equally, and by building the model database via the social accounting matrix, we were able to simulate the increase in the price of hydrocarbons and to solve various non-linear equations with the Mat lab program; which leads to validating the hypothesis and concluding with a number of results and recommendations.
Intention entrepreneuriale en Algérie : mise en évidence des différences entre hommes et femmes
Authors: Merabet Amina , Ben Habib Abderrezak , Abedou Abderrahmane
Published: July 2022

L’objectif principal de cette recherche est d'analyser les différences d'intention entrepreneuriale entre hommes et femmes en Algérie, en utilisant des facteurs individuels et environnementaux comme prédicteurs de l’intention.En se basant sur la théorie d'Ajzen (1991) du comportement planifié (TPB), un modèle conceptuel a été développé puis testé, par l’utilisation du modèle des équations structurelles, auprès d’un échantillon aléatoire de 2578 personnes issues de 14 villes algériennes (Béjaia, Tlemcen, Tizi-Ouzou, Alger, Djelfa, Jijel, Skikda, Sidi-Belabbés, Oran, Bordj-Bou-Arreridj, El-Taref, Tipaza et Naâma).Les résultats de l’analyse multi-groupe indiquent que les groupes de référence, la motivation, la prise de risque et la famille influencent à la fois, l'intention entrepreneuriale des hommes et des femmes.Toutefois, et contrairement aux hommes, les femmes semblent influencées par la perception, la culture, et les institutions et organismes de soutien.
Le profil du dirigeant et l’internationalisation des entreprises algériennes. Cas des entreprises de la région de Bejaïa
Authors: Boukhezer-Hammiche Nacira , Amzal Mehdi Fouzia
Published: July 2022

L’objectif principal de l’article est d’analyser les facteurs influençant l’internationalisation des entreprises algériennes, en mettant l’accent sur les facteurs liés à la ressource humaine ,et spécialement ,au profil deleurs dirigeants sur un échantillon de quatre-vingt entreprises .Pour cefaire ,nous effectuons une analyse multidimensionnelle par le biais del’analyse factorielle des correspondances multiples. Par la suite, afin de tester l’effet des facteurs liés au profil du dirigeant sur la décision d’internationalisation, nous utilisons la modélisation logistique binaire .L’analyse factorielle nous a permis de cerner les caractéristiques liées au profil du dirigeant comme des facteurs déterminants de l’internationalisation des entreprises. Cependant, les résultats économétriques ont montré que ces derniers n’ont pas d’impact significatif sur l’internationalisation des entreprises. Au contraire, la taille et l’âge de l’entreprise, les difficultés financières et la lourdeur des procédures administratives constituent autant de facteurs qui entravent l’internationalisation des entreprises algériennes.
Effective and practical recommendations to dental team when providing dental services in the era of COVID-19
Authors: Tuyishime G. , Dusabimana M. E. , Ineza M. C.
Published: July 2022

Severe acute respiratory syndrome coronavirus 2 (SARS CoV 2) is the coronavirus that causes COVID-19 (coronavirus disease 2019). It is an airborne virus and can spread through small droplets of saliva.Dental professionals work very close to the patient’s mouth, putting them at high risk of contracting SARS-CoV-2. This is because aerosols and splatter are generated when performing some dental procedures, which are known to be the possible potential sources of some other serious diseases to the dental team and patients in the dental settings. During the COVID-19 pandemic, dental professionals continued to provide dental services to patients; however, dental professionals are more likely to become contaminated due to the nature of their work. Hence a cautious emergency implementation of extra-protective measures is paramount to limit viral contamination between patients and the dental team. This research review was performed to summarize essential practical recommendations to be adopted by the dental team when providing dental services to the patient during the COVID-19 period, to minimize the risks of COVID-19.
Theoretical Foundations in Economics and Management
Authors: Vladlenov Denis
Published: July 2022

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Comparison of Hepatic, Renal and Inflammatory Biochemical Parameters in Mild and Severe Covid-19 Patients
Authors:   Department of Biochemistry, Shimoga Institute of Medical Sciences, Shimoga, Karnataka, India, Jyothi R S , Manjula B , Gurupadappa K
Published: July 2022

Background: Several studies have suggested that hepatic and renal abnormalities are seen in COVID-19 patients. So in this study; we are evaluating the hepatic, renal and inflammatory bio-makers in mild and severe group of COVID-19 patients. Objective: To evaluate and compare the hepatic, renal and some inflammatory biomarkers in mild and severe group of COVID-19 patients. Methods: It was a single-centric retrospective study. This study included a total number of 199 RT-PCR confirmedCOVID-19 patients. These patients were divided into the mild group (n=96) and severe group (n=103) depending on the requirement of intensive care unit. We evaluated and compared the hepatic, renal and some inflammatory biomarkers between the mild and severe groups. Statistical analysis was done using a statistical package for the social sciences (SPSS). Results: Out of 199 cases, 68.3% were male and 31.7% were female. The mean age of the study population was found to be 52.4±14.6 years. Statistically, a significant difference at 5%(p=0.001) was observed for creatinine, urea, direct bilirubin, ferritin, aspartate amino-transferase, total protein, and albumin levels between the mild and severe group except for uric acid, total bilirubin, alanine-transaminase, alkaline phosphatase and lactate dehydrogenase. Conclusion: Our study shows hepatic and renal abnormalities are observed in COVID-19 infection. However, the percentage of hepatic and renal abnormalities was more in the severe group compared to the mild group. Further extensive studies should be carried out with a larger population with multi-centric studies in Karnataka. Keywords: COVID-19, Hepatic, Renal
Long Term Impact of COVID-19 on Clinical Practice
Authors:   Department of Ophthalmology, Armed Forces Medical College, Pune, Maharashtra, India,, Singh Ankita , Saraswat Aatish
Published: July 2022

The ongoing COVID-19 pandemic plaguing countries worldwide has created an unprecedented change for the global economy, especially healthcare institutions at the forefront. Acceleration of the online-offline integration is the need of the hour. Massive expansion of home-based care likely will be supplemented with artificial intelligence (AI). One particular sector that has the greatest potential to benefit from tele-health services is the rural sector across all countries. Telemedicine has shown to improve access to healthcare in these populations through a reduction in travel burden and decreased cost of care. Innovative arrangements between the private and the public sectors and digitalization are more crucial now than ever before. The digital media will play a rather more important role in connecting with prospective patients. Thus, as we unravel the mysteries of the ongoing pandemic there are opportunities in the future offering unique learning opportunities for the health care sector. Rationalizing and optimizing available resources with resilience shown on the coronavirus frontline during the crisis are some of the most important lessons learnt during the crisis Keywords: COVID-19, Clinical Practice, Telemedicine.