bluuebunny/crossref_metadata_2025 huggingface dataset:
Mutation of D201G near the receptor binding site significantly drive antigenic drift of circulating H9N2 subtype avian influenza virus
Authors: Xia Jing , Luo Yu-Wen , Dong Meng-Yi , Li Yong-Xin , Wang An-Dong , Li Nian-Ling , Shen Yu-Xi , Li Shu-Yun , Cui Min , Han Xinfeng , Yu Song-Cheng , Li Min , Huang Yong
Published: May 2022

The H9N2 subtype of avian influenza virus (H9N2 AIV) has caused
significant losses in chicken flocks throughout China. Our previous
research has showed that field isolates of H9N2 underwent antigenic
drift to evolve into distinct groups with significant antigenic
divergence from the commercially available vaccines. The present study
sought to identify which single mutations that have naturally appeared
in isolates from the past 5 years has driven antigenic drift. Six
high-frequency mutation sites in/near the receptor binding site (RBS)
region were screened by comparing amino acid alignments of the H9N2 AIVs
isolated from China between 2014 and 2019. Two substitutions, (A168N and
D201G) were demonstrated to have a significant impact on the
antigenicity, but did not change the growth kinetics and cell tropism of
the virus. It is worth noting that the D201G substitution not only
significantly changed the antigenicity, but also caused immune escape of
the parental virus. In conclusion, A168N and D201G substitution are
newly discovered determinants that can significantly change the
antigenicity of H9N2 AIV, which should be tracked during outbreaks.
Characterization and cross-protection of experimental infections with SeCoV and two PEDV variants.
Authors: Puente Héctor , Díaz Ivan , Arguello Hector , Mencía-Ares Óscar , Gómez-García Manuel , Pérez-Perez Lucía , Vega Clara , Cortey Marti , Martín Marga , Rubio Pedro , Carvajal Ana
Published: May 2022

Global emergence and re-emergence of Porcine epidemic diarrhea
virus (PEDV), an Alphacoronavirus which causes a highly contagious
enteric disease, have led to several studies addressing its variability.
The aim of this study was to characterize the infection of weaned pigs
with Swine enteric coronavirus (SeCoV) -a chimeric virus most
likely originated from a recombination event between PEDV and
Transmissible gastroenteritis virus, or its mutant Porcine
respiratory coronavirus-, and two PEDV G1b variants, including a
recently described recombinant PEDV-SeCoV (rPEDV-SeCoV), as well as to
determine the degree of cross-protection achieved against the
rPEDV-SeCoV. For this purpose, forty-eight 4-week-old weaned pigs were
randomly allocated into four groups of 12 animals; piglets in groups B,
C and D were orally inoculated with a PEDV variant (B and D) or SeCoV
(C), while piglets in group A were mock inoculated and maintained as
controls. At day 20 post-infection all groups were exposed to
rPEDV-SeCoV; thus, group D was subjected to a homologous re-challenge,
groups B and C to a heterologous re-challenge (PEDV/rPEDV-SeCoV and
SeCoV/rPEDV-SeCoV, respectively) and group A was primary challenged
(-/rPEDV-SeCoV). Clinical signs, viral shedding, microscopic lesions and
specific humoral and cellular immune responses (IgG, IgA, neutralizing
antibodies and IgA and IFN-γ-secreting cells) were monitored. After
primo-infection all three viral strains induced an undistinguishable
mild-to-moderate clinical disease with diarrhea as the main sign and
villus shortening lesions in the small intestine. In homologous
re-challenged pigs, no clinical signs or lesions were observed, and
viral shedding was only detected in a single animal. This fact may be
explained by the significant high level of rPEDV-SeCoV-specific
neutralizing antibodies found in these pigs before the challenge. In
contrast, prior exposition to a different PEDV G1b variant or SeCoV only
provided partial cross-protection, allowing rPEDV-SeCoV replication and
shedding in feces.
Accounting and the U.S. Constitution: The Evolution of Federal Financial Accounting and Reporting Practices
Authors: McDonough Ryan , Warren J. Donald
Published: May 2022

This study surveys and provides insights into the arc of federal government financial reporting developments, including the reporting mandate contained in the Constitution of the United States. Federal financial reporting has recently surpassed several significant milestones. The U.S. Government Accountability Office and Office of Management and Budget celebrated the 100th anniversary of their founding in 2021. Meanwhile, the Chief Financial Officers Act of 1990 and the Federal Accounting Standards Advisory Board have reached the 30-year mark. Progress during the last 20 years has focused on extending the requirements of the Chief Financial Officers Act, improving federal financial reporting standards, and increasing transparency through easily accessible open data.
Pericyte Control of Blood Flow in Intraocular Islet Grafts Impacts Glucose Homeostasis in Mice
Authors: Tamayo Alejandro , Gonçalves Luciana Mateus , Rodriguez-Diaz Rayner , Pereira Elizabeth , Canales Melissa , Caicedo Alejandro , Almaça Joana
Published: May 2022

The pancreatic islet depends on blood supply to efficiently sense plasma glucose levels and deliver insulin and glucagon into the circulation. Long believed to be passive conduits of nutrients and hormones, islet capillaries were recently found to be densely covered with contractile pericytes with the capacity to locally control blood flow. Here, we determined the contribution of pericyte regulation of islet blood flow to plasma insulin and glucagon levels and glycemia. Selective optogenetic activation of pericytes in intraocular islet grafts contracted capillaries and diminished blood flow. In awake mice, acute light-induced stimulation of islet pericytes decreased insulin and increased glucagon plasma levels, producing hyperglycemic effects. Interestingly, pericytes are the targets of sympathetic nerves in the islet, suggesting that sympathetic control of hormone secretion may occur in part by modulating pericyte activity and blood flow. Indeed, in vivo activation of pericytes with the sympathetic agonist phenylephrine decreased blood flow in mouse islet grafts, lowered plasma insulin levels, and increased glycemia. We further show that islet pericytes and blood vessels in living human pancreas slices responded to sympathetic input. Our findings indicate that pericytes mediate vascular responses in the islet that are required for adequate hormone secretion and glucose homeostasis. Vascular and neuronal alterations that are commonly seen in the islets of people with diabetes may impair regulation of islet blood flow and thus precipitate islet dysfunction.
Diabetes Screening and Monitoring among Older Mexican-origin populations in the US
Authors: Datta Roopradha , Lucas Jennifer A. , Marino Miguel , Aceves Benjamin , Ezekiel-Herrera David , Guzman Cirila Estela Vasquez , Giebultowicz Sophia , Chung-Bridges Katherine , Kaufmann Jorge , Bazemore Andrew , Heintzman John
Published: May 2022

Background: The purpose of the study is to examine diabetes screening and monitoring among Latino individuals as compared to non-Latino white individuals, and to better understand how we can use neighborhood data to address diabetes care inequities. 

Research Design and Methods: This is a retrospective observational study linked with neighborhood-level Latino subgroup data obtained from the American Community Survey. We used generalized estimating equations negative binomial and logistic regression models adjusted for patient-level covariates to compare annual rates of glycated hemoglobin (HbA1c) monitoring for those with diabetes and odds of HbA1c screening for those without diabetes by ethnicity, and among Latinos living in neighborhoods with low (0.0-22.0%), medium (22.0-55.7%), and high (55.7-98.0%) population percent Mexican-origin. 

Results: Latino individuals with diabetes had 18% higher rates of HbA1c testing than non-Latino white individuals with diabetes (aRR=1.18, 95%CI=1.07-1.29), and Latinos without diabetes had 25% higher odds of screening (aOR=1.25, 95%CI=1.15-1.36) than non-Latino white individuals without diabetes. In the analyses where neighborhood-level percent Mexican population was the main independent variable, all Latinos without diabetes had higher odds of HbA1c screening compared to non-Latino white individuals, yet only those living in low percent Mexican-origin neighborhoods had increased monitoring rates (aRR=1.31, 95%CI=1.15-1.49).

Conclusions: These findings reveal novel variation in healthcare utilization according to Latino subgroup neighborhood characteristics and could inform the delivery of diabetes care for a growing and increasingly diverse Latino patient population. Clinicians and researchers whose work focuses on diabetes care should take steps to improve equity in diabetes and prevent inequity in treatment.   
Leading the Development of Research-based Teaching: A Swedish Case
Authors: Ståhle Ylva
Published: May 2022

The aim of this article is to examine Swedish principals’ conception of their leadership role when realising research-based teaching in relation to research traditions. The study is based on ten principals’ conceptions of research-based teaching, analysed phenomenographically. The results indicate that application of research results is in several respects the most dominant notion of what teaching on a scientific basis entails. The conceptions of the principals’ derive from traditionally accepted beliefs and expectations, which is in line with how national reforms are implemented. Instructional and transformational leadership models are represented when leading schools toward research-based teaching.
Penguatan Kapasitas Pengurus BUMDes Mitra Desa Suak melalui Formulasi Kesepakatan Kerjasama dengan Pihak Ketiga
Authors: Maarif Syamsul , Prihantika Ita , Meilinda Selvi Diana , Yulianto Yulianto , Sulistio Eko Budi
Published: May 2022

Kegiatan pengabdian ini dimaksudkan untuk mendorong Badan Usaha Milik Desa agar membiasakan diri memformalisasikan setiap kesepakatan kerjasama yang dilakukan oleh pihak Badan Usaha Milik Desa bersama pihak lainnya. Tujuan dari adanya kegiatan ini adalah: (1) Meningkatnya kapasitas pemahaman pengelola Badan Usaha Milik Desa mengenai pentingnya memformalisasikan setiap kegiatan kerjasama dengan pihak lainnya; (2) Meningkatnya kapasitas pemahaman pengelola Badan Usaha Milik Desa mengenai teknis penyusunan surat perjanjian kerjasama.
Sosialisasi Aspek Psikologis yang mempengaruhi Proses Belajar di Rumah dan Evaluasi Perkembangan Motorik Peserta Didik pada masa Pandemi
Authors: Sujarwo Sujarwo , Yudanto Yudanto , Sunardiyanta Sunardiyanta , Gotho Ridho , Purnomo Arif
Published: May 2022

Tujuan pengabdian pada masyarakat ini adalah memberikan edukasi kepada guru di Taman Kanak-kanak tentang aspek psikologis yang mempengaruhi proses belajar di rumah dan evaluasi perkembangan motorik peserta didik pada masa pandemi. Metode pengabdian dengan paparan materi dan diskusi interaktif antara pengabdi dengan peserta. Menggunakan aplikasi zoom meeting pengabdi akan memaparkan materi peserta menyimak dan aktif melakukan tanya jawab secara daring. Peserta adalah guru taman kanak-kanak di KKG Gugus PAUD IV kecamatan Bantul berjumlah 29 orang. Instrumen yang digunakan untuk mengukur keberhasilan pengabdian menggunakan kuis atau tes baik pre dan post test kemudian dibandingkan antara hasil tes sebelum pengabdian dan juga setelah pengabdian. Pelaksanaan pengabdian masyarakat adalah 3 hari terdiri dari 1 hari proses koordinasi pengabdian, 1 hari pelaksanaan pengabdian, dan 1 hari evaluasi dan pelaporan pengabdian atau total jam yaitu 32 jam. Hasil pengabdian terjadi peningkatan pengetahuan guru di KKG PAUD IV kecamatan Bantul berdasarkan perbedaan rerata mean hasit tes, sebesar: 6.55%. Pengabdian kepada masyarakat ini memberikan dampak yang positif bagi guru dan berdampak dalam pelayanan terhadap wali siswa dan juga kepada siswa dalam proses pembelajaran daring dalam masa pandemi.
Pelatihan dan Pendampingan Penggunaan Media Pembelajaran Game Edukasi “Kids Learning” Berbasis Android Bagi Guru SD Muhammadiyah 02 Pematangsiantar
Authors: Niswa Khairun , Kharisma Adib Jasni
Published: May 2022

Rendahnya tingkat kesadaran dan kemampuan guru secara umum mengenai media pengajaran yang lebih modern dengan mengikuti zaman kemajuan teknologi menyebabkan para guru merasa kesulitan dalam menyampaikan materi dan sulit untuk memotivasi siswa karena para guru masih mengajar dengan metode yang sudah usang dan kuno. Kurangnya inovasi serta sulitnya sarana dan prasarana menyebabkan kreativitas guru terhambat, padahal negara Indonesia merupakan salah satu pengguna ponsel pintar terbesar di dunia. Penggunaan ponsel pintar atau smartphone sebenarnya dapat difungsikan dalam peningkatan pembelajaran yang lebih menarik untuk siswa. Salah satu cara edukasi yang dapat meningkatkan gairah dan motivasi siswa adalah dengan game. Tentunya game yang dimaksud adalah game edukasi  sangat  menarik dalam bentuk “Kids Learning”. Android adalah sistem operasi seluler yang berisi sistem operasi, middleware, dan aplikasi untuk perangkat berbasis linux. Penggunaan metode game edukasi “Kids Learning” diharapkan dapat diaplikasikan dan digunakan dengan android untuk mempermudah guru dalam menggunakannya. Tujuannya adalah tentunya siswa menjadi lebih termotivasi dan minat belajar lebih tinggi karena anak-anak menyukai game. Hal ini dimaksudkan agar dengan mengimplementasikan hasil dari game edukasi ini, siswa dapat belajar dengan lebih efektif, berpikir kreatif dengan lebih baik, dan memperoleh akses ke pengetahuan yang lebih canggih
Peningkatan Pengetahuan KEK dan Pemanfaatan Pekarangan Sebagai Sumber Gizi Keluarga Pada Ibu Hamil
Authors: Fibrila Firda , Ridwan M , Lestari Gangsar Indah , Widiyanti Septi
Published: May 2022

Ibu hamil selama kehamilannya memiliki resiko mengalami kekurangan energi kronik terutama dimasa pandemi penyakit covid-19 akibat kebijakan pemerintah dalam pembatasan mobilitas masyarakat dan menurunnya ekonomi masyarakat. Perlunya upaya untuk mengantisipasi agar tidak terjadi kekurangan energi kronik pada ibu haml, perlu pemanfaatan pekarangan keluarga sebagai sumber gizi kelarga khususnya pada ibu hamil. Tujuan dilakukan kegiatan pengabdian masyarakat ini dalam rangka peningkatan pengetahuan ibu hamil tentang kekurangan energi kronik dan pemanfaatan pekarangan sebagai sumber gizi keluarga. Keberhasilan kegiatan ini dievaluasi melalui kegiatan pre dan post tes. Secara kuantitatif nilai rata-rata peserta sebelum dilaksanakan kegiatan adalah 41,5 dan mengalami kenaikan menjadi 77,17 dengan demikian terjadi   peningkatan   pengetahuan   ibu hamil tentang KEK dan dan pencegahannya sebesar 19.45 point. Hasil observasi terdapat  peningkatan perilaku keluarga dalam pemanfaatan lahan pekarangan sebagai alternatif sumber gizi keluarga dari 41,6%  meningkat menjadi 66,6% setelah pendampingan keluarga.
EDUKASI HIPERTENSI DAN UPAYA PENURUNAN TEKANAN DARAH MENGGUNAKAN TEKNIK RELAKSASI OTOT PROGRESIF DI PUSKESMAS TEJO AGUNG KOTA METRO
Authors: Sari Senja Atika , Dewi Tri Kesuma , Hasanah Uswatun , Nurhayati Sri , Dewi Nia Risa
Published: May 2022

Hipertensi merupakan masalah kesehatan publik utama di seluruh dunia dan merupakan faktor risiko penyakit kardiovaskular, serta belum terkontrol optimal di seluruh dunia. Komplikasi hipertensi apabila tidak ditangani akan mempengaruhi sistem kardiovaskular, saraf, dan ginjal. Salah satu pengobatan hipertensi yang dapat dilakukan yaitu dengan cara terapi komplementer. Salah satu bentuk terapi komplementer adalah terapi relaksasi otot progresif. Teknik relaksasi otot progresif adalah teknik relaksasi otot dalam yang tidak memerlukan imajinasi, kekuatan atau sugesti. Teknik relaksasi otot progresif memusatkan perhatian pada suatu aktivitas otot dengan mengidentifikasi otot yang tegang kemudian menurunkan ketegangan dengan melakukan teknik relaksasi untuk mendapatkan perasaan rileks. Kegiatan pengabdian masyarakat ini dilakukan di wilayah kerja Puskesmas Tejo Agung Kota Metro. Metode yang digunakan dalam pelaksanaan pengabdian ini adalah penyuluhan, demonstrasi dan role play. Hasil pengabdian masyarakat ini menunjukan bahwa Seluruh perserta dapat menyerap informasi dengan baik yaitu 75 % dapat mempraktekan kembali teknik relaksasi otot progresif yang diajarkan. Edukasi dan role play seperti ini dapat terus dilakukan oleh pihak puskesmas kepada masyarakat.
REGISTERIAL REPRESENTATION IN KARONESE MANTRA TEXT
Authors: TARIGAN ERA MELANI , GINTINGS IMMANUEL PRASETYA , GINTINGS ELIA MASA
Published: May 2022

The objectives of this study were conducted to find the registerial representation implied in Karonese mantra text in erpangir ku lau, and to discover the registerial representation in the karonese mantra text. This research was conducted by descriptive qualitative method. The finding of this study showed that the registerial reprsentaion are implied in karonese mantra text in Erpangir ku lau were Field, tenor and Mode. Field is realization of experiential meanings; these experiential meaning are realized through transitivity pattern, from 6 kinds of total process in transitivity there is only five types were implied in karonese mantra text, they were material, relational ,mental, verbal and behavioral process in this text. the tenor is the realization of Interpersonal meanings; these interpersonal meaning through the mood, there just 2 kinds from 3 total mood that found in karonese mantra text, they were declarative and imperative. In Mode that realizes in Theme pattern found that all of 4 types in Theme were implied in this text. This theory also related to the register language, the Frozen and formal discovered in karonese mantra text.
SEMIOTIC INTERPRETATION OF COLOR IN JAVANESE TEDAK SITEN CEREMONY TEXT
Authors: RISKIA VANIA DWISARIKA , ZA ZAINUDDIN , BAHRI SYAMSUL
Published: May 2022

The purpose of this study was to find the true meaning of color used in Tedak Siten Javanese ceremony text. The study was conducted by using desccriptive method. The data of the study were photos, video and also interview section with the informans. The data analysis were taken by observing, interviewing and listing the data into some classification. The data were analyzed based on the theory that proposed by Charles Saunders Pierce’s Semiotic Triangle and Rolland Barthes. The findings identify that there were seven kinds of color which used in Tedak Siten, they were black, purple, blue, green, red, yellow, and whiter. There are no rules for the colors arrangement. According to both of theories black symbolized equality, purple symbolized wealth, blue symbolized trustworthy, green symbolized lucky, red symbolized love, yellow symbolized happy and white symbolized pure.
SYMBOLIC INTERPRETATIONS IN MEDYA HUS’S POEMS IN ACEHNESE
Authors: PUTRI NAZIRA , DIRGEYASA I WAYAN , SINAGA LIDIMAN SAHAT MARATUA
Published: May 2022

Principally this research attempts to find out the symbols and reasons displayed in Medya Hus‟s Poems in Acehnese. This study was conducted by using descriptive qualitative method. The sources of the data were the poems in „Jameun Internet‟ book by Medya Hus in Acehnese. The instrument for collecting data are documentary sheet. The data were analyzed by using Pierce‟s theory of semiotic. The writer found 22 meanings were displayed in the Medya Hus‟s poems. They were Aki wèt-wèt (3,33%), Budôk (3,33), Engkôut (3,33%), Ujeuen (3,33), Zakéut (3,33%), Teukabo (3,33%), Kayèe Syuruga (3,33%), Syuruga Lapan (3,33%), „Arasy (3,33%), Rabôn (3,33%), Qur‟an ngon Hadis (3,33%), Nuraka (3,33%), Agama (20%), Lampu (3,33), Bohaté (3,33%), Mata Beungah (3,33%), Kapai (3,33%), Syèthan (3,33%), Ratéb (6,7%), Syuruga (10%), Tasbèh (3,33%), Taqwa (3,33%). In the poems contain of different symbols and meaning. Medya Hus almost used the symbols that related to Islamic concept to show the roles of Islam in Aceh and explained the Acehnese culture and society, and nature.
Problems existing in global supply chains by sea container ships
Authors: Vinogradov Sergey Vladimirovich , Vyazovaya Dar'ya Aleksandrovna
Published: May 2022

The article considers the system of maritime logistics as the dominant sector in world transport. Container transportation is analyzed in detail as its key segment. Global supply chains in maritime container transportation depend to the complex interaction of participants (from the supplier and carrier to the terminal operator), where many problems arise due to the lack of a clear work algorithm for each party. With supply chains distributed across global markets, container shipping is now an important element of the transport system having a significant advantage. The general characteristics of transport activity in container supply chains are listed. The imbalance in trade flows and limited capacity complicate the realization of all the advantages in this type of transportation. Insufficient knowledge of the chain interaction of maritime transport has been stated, a review of the main problems in global supply chains in the field of maritime container transportation was carried out, as well as an analysis of existing works on the proposed topic. For further research, it is recommended to pay attention to the problem of coordination of container transportation of the supply chain, to study the issue of pricing and risk management, competition in transportation by sea container ships, and also to consider performance management in the supply chain of this type of transport. Conclusions are drawn about the need for additional research and the application of methods and tools for managing operations to optimize work without financial losses for all participants in the container transportation chains.
Basic problems of introducing methods of processing polymer composite materials and maintaining technological processes in marine equipment production
Authors: Pavlov Akim Vladimirovich , Sakhno Konstantin
Published: May 2022

In the past few years there could be seen an increasing use of polymer composite materials in the marine industry. Polymer composite materials reach 70% in the volume of parts and structures of ships and marine equipment. The most intensive growth in the implementation of composite materials can be observed abroad. The problem of complete or partial absence of domestic original reinforcing fibers and polymer matrices is revealed. The necessity to define the limiting factors for using the polymer composite materials in the shipbuilding industry of the Russian Federation is substantiated. A study of domestic and foreign literature, industry regulations was carried out, in which the deductive methods, analysis and synthesis were used. The ecosystem of organizing the technological process from the polymer composite materials in the production of structures and parts of marine equipment is considered. The specific features of the technological process are listed, and a formula that describes the speed of the infusion process and determines the parameters on which the process depends is given. It has been found that the main documents regulating the use of polymer composite materials in shipbuilding are focused on the production processes in the 1970s. Nowadays, a competitive struggle for the orders and deadlines forces to use computer-aided design systems for creating 3D models of parts and structures in designing complex structures. There have been defined the restraining factors that have a negative impact on the development of technological processes of working up and introducing the polymer composite materials in in the national industry. The results of the study will further serve to form methodological materials and options for designing technological processes for the processing of polymer composite materials in the Russian industry.
Technological bases: concept and problems of formation
Authors: Antonenkova Tat'yana Vladimirovna
Published: May 2022

The task of achieving the required accuracy of the positional relationship of the part surfaces, as a rule, is solved at the stage of manufacturing the engineering products. Basing is a procedure associated with the orientation of surfaces in the process of processing a part or assembling a product in order to meet the specified conditions of positional relationship. The practical interpretations of the principles of the basing theory do not allow to find the sound solutions to the key problems that arise in the course of basing. The presented analysis of the interpretations of the concepts used in the basing theory reveals the emerging uncertainties in solving the problems of ensuring the positional relationship of the surfaces in the machining process. It has been stated that the existing regulatory documents (GOST 21495-76, GOST 3.1109-82) do not indicate the ultimate practical purpose of basing. There are considered the problems of representing the 3D geometric structures. There is illustrated a 6D diagram, which includes three linear and three angular coordinates. Analysis of uncertainties in basing theory has been carried out, different cases of basing have been considered, in the result of which basing has been defined as positioning the shaping movements of the tool relative to the surface (surfaces), to which the requirements of the positional relationship are set. The schemes for basing prismatic and cubical parts are given. Conclusions are drawn about the lack of reference to the geometric properties of surfaces and their dimensions (extent, width) when assigning them as base ones. The conditions for the set of bases have been investigated, the rules for arranging the bases in basing process have been formulated.
Analysis of hydraulic concrete strength test methods
Authors: Pichugin Dmitrii Alekseevich , Surikova Anastasiya , Surikov Vladimir Alekseevich
Published: May 2022

Today, methods of determining the tensile strength of concrete are of considerable interest. These methods using the anisotropy of brittle materials and, in particular, concrete, with respect to compressive and tensile stresses, make it possible, based on the findings of the theory of elasticity, to determine the tensile strength when tested with a compressive load, which can be transferred to the sample much more easily than tensile forces. The results of tests of concrete by the method of compression of cylindrical samples and crushing of cube samples with hewn ribs between two round metal rods lying in the same plane closely match the tensile strength values obtained with direct tension. For all studied compositions, the value of the strength ratio increases as the water-cement ratio increases, both for concrete without additives and with additives of surfactants. Using additives of surface-active organic substances without changing the dependence of the strength ratio on the hardening time makes it smoother. It has been found that the fast decreasing value of the strength ratio, hardening period that corresponds to its minimum value, and further increase or stabilization of Rp / Rc depend on a number of factors of the cement used, storage conditions of surfactant additives, composition, etc. Under the influence of the different factors the position of the characteristic points on the curve of the strength ratio dependence on the hardening time can change and obey the general pattern. For concretes and mortars, the decrease in the strength ratios in the transition from 28 days to the age of 90 days makes up to 10–25% (and in some cases much more), which must be taken into account in appropriate cases when designing structures.
Developing cooling system for small-sized marine diesel engines operating at different seawate temperatures in laboratory conditions
Authors: Pokusaev Mikhail Nikolaevich , Trifonov Alexei Viktorovich , Kostyrenko Vasiliy Aleksandrovich
Published: May 2022

Using a cooling system in water transport is considered the most effective way to increase the energy efficiency of a vessel. Currently, closed-loop cooling systems and frequency-controlled drives of seawater electric pumps are actively used. An option of improving the energy efficiency of cooling systems with mounted seawater pumps is being studied. The hydraulic scheme of the unit with an energy-efficient ship engine cooling system is presented. To study ways to reduce mechanical losses in the drive of auxiliary mechanisms of a marine engine, the laboratory “Marine Diesels” of Astrakhan State Technical University developed a test bench for the Iveco 8041I06 engine. The engine cooling system does not have a thermostat to control the thermal state; instead of a thermostat on the engine, an electronically controlled variator is installed between the engine power take-off shaft and the VKS 1/16 pump. At a constant engine speed, the variator allows changing the pump speed, supply of sea water through the heat exchanger and regulating the thermal state of the engine. It has been found that during engine tests it is necessary to maintain the temperature of the outboard water constant. A description is given of the use of tanks with thermal insulation at the stand to reduce heat exchange with the environment. Variants of types of containers and materials for insulation are considered. To prepare water of the required temperature a chiller is connected to the cooling system at the experimental stand. The calculation of thermal insulation and comparison of the result with a real test is given. On the stands for testing diesel engines the change in the thermal state of the engine is carried out only by changing the load on the engine. On the developed stand, the thermal state can also be changed, including by controlling the seawater temperature, which expands its capabilities for modeling real processes.
AF397, AK652, AN193 and AV442 antibodies recognize a GFP-tagged Golgi protein by immunofluorescence
Authors: Marchetti Anna
Published: May 2022

AF397, AK652, AN193 and AV442 antibodies against the GFP protein recognize a GFP-tagged human B4GT1 protein by immunofluorescence in paraformaldehyde-fixed HEK cells.
The Acute Effects of Different Warm-Up Protocols on Some Performance Parameters in U11-16 Soccer Players
Authors: Aktaş Muhammed Mustafa , Kaymakçı Ayşenur Turgut , Bakıcı Doğuş , Gelen Ertuğrul
Published: May 2022

Purpose: The purpose of the study is to examine the acute effects of different warm-up protocols on some physical performance parameters in the Under 11-16 (U11-16) category soccer players.

Material and Methods: The participant group of the study consisted of seventy-two male soccer players who regularly train in the U11-16 category. Soccer players randomly and counterbalanced participated in the one of the warm-up protocols of FIFA 11+, HarmoKnee, Dynamic warm-up, or Mixed warm-up on non-consecutive days. After participants performed one of the protocols, their flexibility, vertical jump, 30m sprint, and agility performances were measured. Repeated measures in the ANOVA test were used to determine intra-group differences (U11-U12-U13-U14-U15-U16) and Bonferroni test was used to decide which protocol caused a significant difference.

Results: In all underage categories, FIFA 11+, HarmoKnee, and dynamic warm-up caused a significant difference in flexibility, vertical jump, 30 m sprint, and agility compared to Mixed warm-up (p < 0. 05).

Conclusions: As a result of the study, it was shown that FIFA 11+, HarmoKnee, and dynamic warm-up protocols acutely caused a positive influence in flexibility, vertical jump, 30 m sprint, and agility in all underage categories. These three warm-up protocols may be used to prevent athletes from warm-up uniformity and monotony and support multidirectional development.
Impact of COVID-19 Pandemic on Psychical Health and Social Relationships Among University Students
Authors: Lenková Rút , Pajonková Frederika , Lukáčová Tamara
Published: May 2022

We have never faced such a global pandemic as COVID-19 in modern history. It´s important for us to find out how it can affect mental health and social relationships of students. This pandemic has brought us not only the risk of dying from a viral infection, but also brought the enormous psychological pressure on people. Purpose of this study was to determine the impact of COVID-19 pandemic on mental health and social relationships of university students.

Methods: The research group consisted of 95 students of the Faculty of Sports of the University of Prešov in Prešov (men: n = 62, women: n = 33) with an average age of 22 +/- 6 years. As a method of data collection we used the standardized questionnaire of the World Health Organization - WHOQOL-BREF. Our modified WHOQOL-BREF questionnaire represents a selection of 9 items, six of them represent mental health: (1) Positive feeling (2) Self-esteem (3) Thinking, learning, memory and concentration (4) Bodily image and appearance, (5) Satisfy with you, (6) Negative feelings, and three represent social relationships (7) Personal relationships, (8) Sexual activity, (9) Social support. Due to the extraordinary pandemic situation an online survey was conducted to the students. Students had time to complete the questionnaire from 17.11.2021 to 19.11.2021.

Results: Statistical significant difference between periods before and during COVID-19 pandemic was determined using the Wilcoxon paired t test. There were statistically significant differences in the psychological experience and social relationships of university students before and during the COVID-19 pandemic.

Conclusion: We recommend monitoring the mental health of university students and raising awareness of various media platforms about psychological problems during a pandemic.
Analysis of the Professional Competency Indicators of University Physical Trainer Students
Authors: Benbernou Othman , Bennama Fatima , Belkadi Adel , Boukchiche Sedik , Koutchouk Sid Mohamed
Published: May 2022

Objective: The main purpose of this study was to analyse the indicators of the professional Competency of University physical Trainer students, and to explore the importance of these professional indicators. By referring to the two international physical fitness education institutions and literature reviews, three important perspectives of professional Competences are: Professional knowledge, Professional skills, Professional attitude, Furthermore, the result of this research was concluded after three integration of opinions.

Method : Delphi technique was used to integrate the opinions of fifty-two experts and scholars, and the research results were obtained after three integrations. Among the 52 indicators at the three levels.

Result: experts agree that professional attitude is the most important. followed by professional skills, and then professional knowledge. the professional attitude level, “maintaining a positive and enthusiastic professional attitude” was the most important indicator. In the professional skills level, it was noted that “physical fitness training cycle plan design ability”, “physical fitness action correction ability”, “emergency intervention” Ability to adapt” and “ability to use and demonstrate sports equipment” are the most important indicators. In terms of professional knowledge, “customer sports curriculum design” is the most important.

Conclusion: this research can provide references for the university in future development of physical trainer’s training program and establish regulations; fitness club hiring process; self-growth in the industry; future researches and studies.
Experimental Examination on Performance and Emission of a Coated Diesel Engine Fueled with Diesel and Pre-Heated Coriander Oil Blends
Authors: Hazar Hanbey , Demirpolat Ahmet Beyzade
Published: May 2022

The aim of the study is to determine the effects of the preheated coriander seed oil, used as fuel, on the performance and the emission characteristics of the ceramic coated single-cylinder diesel engine. In this study, the piston, exhaust, and inlet valve of a single-cylinder air-cooled diesel engine were coated with Cr3C2 at 300 µm thickness. Pure coriander oil was mixed with diesel fuel volumetrically at the rates of 30% and 50%. The plasma spray method was used as the coating method. It was determined that the preheating process provided a more suitable fuel flow, decreased the viscosity of the coriander oil and also the coating process decreased CO, soot and HC emissions but increased NOx, thermal efficiency, and EGT.
Catalytic pyrolysis of low density polyethylene and polypropylene wastes to fuel oils by N-clay
Authors: Adoga Sunday Ogakwu , Igbum Ogbene Gillian , Okopi Glory , Ikyenge Barnabas Aloo , Ochi Okwori Isaacs , Ode Patrick
Published: May 2022

Dealing effectively with plastic wastes has been a major global challenge. Different methods have been previously employed to proffer solution to plastic wastes problem however, all showed their energetic, economic and environmental implications. In this research, catalytic pyrolysis of low density polyethylene and polypropylene wastes was carried out to proffer solution to the problem. The plastic materials were collected and appropriately prepared after which ultimate and proximate analysis was carried out on them. The clay was collected from Naka, Gwer West Local Government Area of Benue State, Nigeria, thereafter, referred to as N-clay and was appropriately prepared, then analyzed by a BET analyzer for the following properties: the surface area, which was found to be 85.418 m2/g, pore size 2.100 nm and pore volume of 0.042 cc/g. Also, the XRF determination of the chemical composition of the N-clay was done and the SiO2/Al2O3 ratio was found to be 70.81/29.19. The N-clay and the plastics were then pyrolyzed in a chemical vapor deposition (CVD) reactor in the ratio 1:3 respectively, at 500 oC with residence time of 30 min using nitrogen as purge gas. The polypropylene yielded 70.34 % liquid oil, 6.43 % char and 23.23 % gas. The liquid was analyzed for functional groups, using Raman spectrometer. Physicochemical analysis was also done on the oil and it was determined that the oil had properties consistent with commercial-grade gasoline. The low density polyethylene yielded wax, instead of liquid, char and gas. Finally, it was concluded that the N-clay was suitable as catalyst for the pyrolysis of plastics and the fuel oil obtained from polypropylene pyrolysis is comparable to gasoline fuel.
Changes in the Share of Consumption in GDP in Poland Between 2011 and 2020
Authors: Kasprzyk Beata
Published: May 2022

Subject and purpose of work: Analysis of changes in the structure of consumption as a component of GDP in Poland for the period 2011-2020, comparative assessment of GDP and consumption per capita in Poland in comparison with EU countries-27 in 2011-2020.

Materials and methods: For the empirical analysis EUROSTAT and CSO statistical data covering the values of the basic components of GDP and consumption/consumption levels per capita were used. Methods of dynamics and comparative analysis were applied in relation to consumption levels. The statistical structural analysis made it possible to measure the intensity and degree of differentiation of the components of GDP in Poland in dynamic terms. The index of inferential structural changes and the divergence coefficient of Clark structures were used.

Results: Based on the collected empirical material, the level of consumption in Poland was assessed in comparison with all EU-27 member states for the period 2010-2020. Using a quantitative approach, the degree of diversification of the structure of basic components, including consumption in GDP in dynamic terms, was also compared.

Conclusions: The level of consumption in Poland in the last decade has been systematically increasing, in terms of growth rate it reached a value above the EU average. The research confirmed the occurrence of significant differences in consumption per capita in the EU-27 countries, both in the compared years and in static terms. These differences were particularly visible between the highly developed countries of Western Europe and Southern Europe. The values of measures of similarity of structures for the components of GDP indicate that in 2015-2020 there was a significant similarity of structures in the relations consumption/accumulation/foreign trade balance, while the differentiation of these structures differed more significantly at the beginning and end of the 2011-2020 decade.
Funds of Local Government Units in Regional Operational Programmes 2007-2013 and 2014-2020
Authors: Pietrowski Wojciech
Published: May 2022

Subject and purpose of work: The article concerns own contribution of local government units involved in the Regional Operational Programmes. The aim of the research is to assess the amount of own funds in the projects implemented under the ROP.

Materials and methods: The article analyses the secondary data obtained from the Local Data Bank, the data from the programme documents and available literature.

Results: As the study has shown, no significant differences were found in the disbursement of funds in different years. However, in the perspective 2014-2020, the amount of local governance units contribution is higher.

Conclusions: The regional distribution of the local government units resources in the particular regional programmes is strongly related to the total amount of the entire programme, but there is a noticeable variation between the perspectives. Still, local governance units own resources outweigh the national contribution.
Effectiveness of Investing in the Stocks of Renewable Energy Companies in Poland
Authors: Daniluk Katarzyna
Published: May 2022

Subject and purpose of work: This study investigates the effectiveness of equity investment in renewable energy companies. The aim of the research is to compare the effectiveness of investing in the stocks of companies from the conventional and renewable energy sector on the Warsaw Stock Exchange.

Materials and methods: The research material consisted of the stock prices of selected energy companies listed on the Warsaw Stock Exchange’s Main Market and NewConnect. Representative investment portfolios were created and their average monthly logarithmic rates of return, standard deviations and Sharpe ratios for the period 2013–2020 were examined.

Results: The portfolios of renewable energy companies were characterised by higher risk, but also higher average returns; as a result, they achieved higher risk-adjusted efficiency ratios than the portfolios of conventional energy companies.

Conclusions: Shares in renewable energy companies, despite a significant risk, can be an attractive form of investment, which is crucial for privately financing the energy transformation in Poland.
Russian internal migration in Kuban’. The case of Krasnodar.
Authors: Mamayusupova Kristina
Published: May 2022

Environmental migration owes its existence to pull factors, i.e. disastrous environmental factors that push people to migrate to other lands. In this article the definition of environmental migration is reversed, since in Russian internal migration towards the Kuban’ region and, in particular, towards the city of Krasnodar, pull factors are transformed into push factors, giving rise to migration in which the climate is an attractive pole, around which other migratory causes are placed. The migratory flows directed towards the city of Krasnodar are a great resource of demographic rebirth, the motor of regional and city life, the growing stimulus towards rapid urban development and the transformative and generative force of infinite territorial images, endlessly created by each migrant present on the territory under examination.
An Automated Algorithm for the Sectional Analysis of Reinforced and Prestressed Concrete Columns
Authors: Kovacs B. , Toader T.-N.
Published: May 2022

This article aims to describe an automatic calculation algorithm developed for the analysis of reinforced concrete and / or prestressed concrete cross sections. The sectional analysis consists in the generation of two characteristic curves: the bending moment - curvature (M-1/r) and the axial force - bending moment (N-M), the calculation approach and the implementation of the algorithm being briefly described by the mathematical equations used. To verify the calculation algorithm, the results were compared with those obtained from experimental tests in the laboratory but also with numerical simulations using commercial computational software based on the finite element method (FEM). The algorithm was written in the MATLAB programming language. The results obtained with the developed algorithm show conservative results when compared to the experimental ones. Moreover, the bending moment resistance for prestressed concrete columns using bonded tendons is better estimated with at least 10% when compared with the one obtained with a fiber based cross section nonlinear analyses.
Compact Testing of Total Station Instruments Using Folded Optics
Authors: Pagounis V. , Merlemis N. , Anastasiou D. , Arabatzi Orthodoxia , Zacharis V. , Tsakiri Maria
Published: May 2022

An optimized compact-based method is introduced that verifies the distance measuring precision of surveying instruments. The paper describes the improvement of the compact based method not only in establishing a compact facility by using shorter lengths and folded path but also in the assessment process by implementing the official ISO standard for electronic distance measuring equipment (ISO 17123-4). The method produces statistically comparable results to ISO standards and is suited for regular instrument checks in institutions with limited space available.
Prediction of Fresh and Hardened Properties of Self-Compacting Heavy-Weight Concrete Using Response Surface
Authors: Sagliyan Sibel , Yalcin E. , Alyamac K. E. , Polat C.
Published: May 2022

The aim of this study is to investigate the fresh and hardened properties of the self-compacting heavy-weight concrete (SCHWC) and to develop a mathematical model for the prediction of these properties. The binder was the Portland cement and fly ash (FA). Barite aggregate was used to achieve the heavy-weight concrete (HWC). A polycarboxylate based super plasticizer was used to increase workability and reach self-compacting feature. To research the fresh and hardened properties SCHWC many concrete mixes were prepared accordingly with “water-cement ratios”, “total aggregate-cement ratios”, and “fly ash-cement ratios”. These samples were tested to get the slump-flow, V-funnel, 7 and 28-day compressive strength values. The Response Surface Methodology (RSM) was used to develop regression equations using these experimental results. It is observed that the estimated values obtained with RSM are compatible with those obtained by the experimental method for the fresh and hardened properties of SCHWC.
Comparative Studies and Research on Optimizing Electric Consumption of Water Supply Systems
Authors: Szabo S. , Kovacs T. , Ionescu G.L. , Cziszter K.I.A. , Ionescu Daniela-Smaranda , Sărăcuț-Ardelean A.F.
Published: May 2022

Water Supply Systems (WSS) can very well be dubbed as the backbone of every major human settlement for thousands of years at this point as every major human settlement throughout history has, regardless of time period or rural/urban erection or evolution has had its emplacement close to if not dead center over a significant water source that can provide this valuable and desperately needed resource to the populace. Of course, with the passage of time and the ever increasing number of the population and their life style, new techniques and technologies were incorporated within the grand design of the water supply pipeline, mainly automation and operation reliability boosts by means of electricity. It is a given that electrical current is not cheap to produce and maintain, although it is a field of ongoing study and research when it comes to optimizing the energy consumption of any system that runs on this costly resource, both for making the overall operation of the entire system more reliable but also more economical, all the while taking inspiration of multiple specialty works published within this field and, of course, already established local and European Union standards within Romania.