bluuebunny/crossref_metadata_2025 huggingface dataset:
Relation between the cooling time and friction results in braking tests
Authors: Neis P.D. , Zanetti G.L.P.G. , Schmidt E. , Perez Delgado Y. , De Baets P. , Ferreira N.F.
Published: July 2021

The current paper intends to evaluate the influence of the cooling time on friction results duringbraking performed on a laboratory-scale tribometer. At the same time, a possible correlation between theoxidation process and emissivity on the disk surface during cooling time is investigated. Sample and diskused in the tests are from a commercial available brake car. Procedure includes changes in the coolingtimes, where 4 different conditions are experienced: 18s, 90s, 600s and 24h. Friction curves revealdifferences between the results obtained with 18s, 90s and 600s. Likewise, when a cooling time of 24h isused, the first stop shows a considerable reduction in the coefficient of friction. It was not possible to find outthe reason for this effect since relationship between friction and oxidation degree, verified by means ofemissivity on the disc surface, could not be encountered.
An experimental model to describe the temperature variation of the disk during braking tests
Authors: Neis P.D. , Zanetti G.L.P.G. , Schmidt E. , Perez Delgado Y. , De Baets P. , Ferreira N.F.
Published: July 2021

In the present paper an experimental model is created to describe the temperature variation ofthe disk inexperiments performed on a laboratory-scale tribometer. A commercially available brake pad anddisk are used in the tests. The operating parameters seton the tribometer are a constant rotation of660 rpm, torque of 10Nm and 15Nm, braking time of 25s and 50s and initial temperature of 50°C and100°C. The evaluation of the thermal results is done by using a statistical model for analysis of variance(Anova). In order to obtain a mathematical equation to describe the temperature variation of the disk,a linear regression model is used. At the same time, the effect from both, temperature variation and initialtemperature, on the coefficient of friction are investigated.The effect of the temperature variation oncoefficient of friction is complex and it seems to not have correlation between them both. When the initialtemperature is changed from 50°C to 100°C the coefficient of friction is increased. The results from thecurrent paper shows that the experimental model can be used to predict the temperature variation of thedisk during braking tests performed on the tribometer.
Theoretical and experimental approach of friction in a multi-samples sand-slurry tribotester
Authors: Kalacska Gabor
Published: July 2021

The „sand-slurry” method is wellknown among the abrasive tribotesting procedures[1-5]. Based on the DIN50322 standard defining the different tribotesting categories the number VI.category suggests the application of simplified test samples and conditions under control. At theInstitute for Mechanical Engineering Technology a new sand-slurry tribotester was developed featuredby the multi-samples holders taking different speed and load condition into account within one testrush. The resulted friction loss of the tests can be calculated by torque measurements andapproaching calculation as well. The testrig and the method is used for testing different coated steelsamples.
Development of brake caliper for rally-car
Authors: Horvath A. , Csik Z. , Sukumaran J. , Neis P. , Ando M.
Published: July 2021

We have succeeded to work out a designing-controlling-manufacturing process bywhich it can be manufactured a given special brake calipers with extremely short transit time. We havedealt with elaborating such finite element background during working out the process in which the newconstructions can be simulated to deformation reliably. We have reached this by creating suitablematerial models and boundary conditions which we identified after manufacturing the prototype. Wehave also established a separate model-system for optimizing the brake pad beside the caliperopening, based on which the optimal piston diameter and its position can be determined, too. Thebasic standpoint was the proper change following at developing the process because of the CADCAE-CAM-CNC systems and their proper connections.As a result of this system the rally brake calipers can be made quickly, reliably and economically fordifferent racing cars.
Multiwire submerged arc welding of steel structures
Authors: Dhollander R. , Vancauwenberghe S. , De Waele W. , Van Caenegem N. , Van Pottelberg E.
Published: July 2021

The assembly of large structures made out of thick steel plates requires a welding process bywhich multiple wires can be used simultaneously. To reproduce these industrial processes in a researchenvironment, OCAS has invested in a multiwire submerged arc welding (SAW) setup. In this multiwiresetup, up to five wires in tandem configuration can be used.The objective of this master thesis is to establish a deeper knowledge of process parameters used to weldsteel plates in a thickness range of 12,7 up to 25 mm, by means of the submerged arc welding process.Based on literature, a test matrix is composed in which the number of wires, the plate thickness and otherweld parameters are the variables. In addition, a specific plate preparation for each plate thickness isderived from the literature. The preformed weld trails will be evaluated on weld bead geometry andmetallographic properties. There is further experimental examination required, which will result in therevising of the matrix.
Leak tightness of magnetic pulse crimped joints
Authors: Loosveld A. , De Waele W. , Faes K. , Zaitov O.
Published: July 2021

The goal of this master thesis is to realize and investigate leak tightness of joints produced by theelectromagnetic pulse (EMP) crimping process. This way of joining metals has gained more attention lately.With EMP welding, leak tight joints can already be achieved. However, the crimping process has somemajor advantages over EMP welding like the fact that more material combinations are possible and itrequires less energy. To realize the leak tightness, two kinds of sealing materials are used: O-rings andadhesives. The workpieces consist of an aluminium or stainless steel tube which is crimped on a solidaluminium mandrel with circumferential grooves in it. First, some preliminary tests are performed todetermine how much the tubes deform in the grooves. This deformation mainly depends on the appliedcharging voltage and the geometry of the groove. With this information, it is possible to estimate the amountof compression an O-ring would undergo when placed inside this groove. On other workpieces, adhesiveswill be applied. Several test procedures can be conducted on the parts to investigate leak tightness. Theresults of a helium test and a pressure burst test on the first test series conducted at the Walloon researchcentre CEWAC already showed that the use of O-rings can be effective.
Growing Up as a Girl in Late Socialist Poland: The Personal, the Political and Class in Feminist Quasi-Autobiographical Novels by Izabela Filipiak and Joanna Bator
Authors: Mrozik Agnieszka
Published: July 2021

The article examines how representations of late socialism, seen through the eyes of adolescent girls, function in ‘quasi-autobiographical novels’ by Izabela Filipiak (Absolutna amnezja [Absolutne Amnesia], 1995) and Joanna Bator (Piaskowa Góra [The Sandy Hill], 2008). The authors, born in the 1960s and self-identified feminists, became voices of the women’s movement in post-1989 Poland. From their novels, the picture of late socialism emerges as either nightmarish (Filipiak) or grotesque (Bator). Examining family relations, but also intimate relations (understood as political), the author argues that the novels’ focus on gender/sexual differences is consistent with the dominant message of the women’s movement in Poland, which after 1989 lost sight of class differences, contributing to their naturalization and taming. Through the aforementioned examples, the author demonstrates that late socialism is an essential component of the founding story of contemporary feminism in Poland, and that the topos of the conflict between mothers and daughters is a useful tool of its anti-communist identity politics. Discussing the issue of the literary genre, the article proves that the choice of a quasi-autobiographical novel, based on the Bildungsroman scheme, harmonizes with the biographical, artistic and political settlements of the ‘breakthrough generation’ with late socialism and transformation.
Beyond the Threshold – Autobiography, Dialogic Interaction, and Conversion in Gerard Manley Hopkins’s and W. Abdullah Quilliam’s Poetry
Authors: Kindermann Martin
Published: July 2021

The intertwinement of poetic life writing and theological reflections has a long-standing history in British literature. This paper shows how two Victorian poets – Gerard Manley Hopkins and W. Abdullah Quilliam – use dialogic strategies to establish an autobiographic voice, which becomes an essential poetic means of the text. Through the representation of dialogic encounters, the poems establish an autobiographic mode of speaking, which is used to articulate individual conversion experiences and to negotiate conversion as an encounter with God. Based on the works of Martin Buber and Emmanuel Levinas, I will show how a dynamic understanding of text and conversion experience is essential to a reading that seeks to explore the poetic construction of Hopkins’s as well as Quilliam’s works. The representation of the dynamic encounter of the self and the Divine in the contact zone of the text provides a frame in which the authors locate themselves with regard to the religious majority of Victorian Britain. The texts link the spiritual journey of conversion to the self as being caught in the world, responding to God’s call as an answer to the world’s condition.
The effect of PjBL Model toward PGSD student’s ability in conducting research of natural science
Authors: Pratiwi Nita
Published: July 2021

This research aims to get information about the effect of the PjBL learning model used in learning on PGSD student’s ability to conduct research of ICT-based science research subjects. This research is an experimental study with a pretest-posttest control group design. The outreach population is all 6th-semester students of the ICT-based Science Research Program at Yogyakarta State University and the sampling method uses Purposive Sampling. Data analysis uses a Variant Univariate Analysis T-Test on the significance level of 5%. The results showed that the project-based learning model increases positively and significantly towards student’s ability as well as a significant difference of results towards student’s ability between the group of students studying in the class with conventional methodology and PjBl methodology.
EVIDENCE BASE OF SITAGLIPTIN CLINICAL USE. 10 YEARS IN THE MARKET OF THE WORLD
Authors: Kravchun N.
Published: July 2021

A review of the scientific literature about treatment of patients with type 2 diabetes mellitus with the help of the first approved drug from the group of DPP-4 inhibitor sitagliptin was presented. The effects of the treatment of sitagliptin on carbohydrate metabolism, bone metabolism, evaluation of cardiovascular safety were given.
XXV Международный симпозиум Нанофизика и наноэлектроника", Нижний Новгород, 9-12 марта 2021 г. Влияние добавки хлорпентафторэтана в составе хлорсодержащей плазмы на скорость и характеристики профиля травления арсенида галлия
Authors: Охапкин А.И. , Краев С.А. , Архипова Е.А. , Данильцев В.М. , Хрыкин О.И. , Юнин П.А. , Дроздов М.Н.
Published: July 2021

In this work, the dependence of plasma-chemical
etching rate and the roughness of the surface of gallium arsenide
crater on chloropentafluoroethane (C2F5Cl) concentration in a
mixture with chlorine, forward power and etching duration were
studied. Characteristics of GaAs etching crater were studied
by white light interferometry and scanning electron microscopy.
It is shown that C2F5Cl addition in chlorine-containing inductively
coupled plasma led to a nonlinear change of gallium arsenide
etching rate with time which can be explained by passivation of
substrate surface at the initial stage by products of freon decay.
Along with this, characteristics of the etching profile of GaAs
are significantly improved. Forward power increase contributes
to development of roughness, while the etching rate increases
nonlinearly.
Модель терагерцового квантово-каскадного лазера на основе двумерного плазмона
Authors: Дубинов А.А. , Алешкин В.Я.
Published: July 2021

In this work, we calculated the characteristics of a two-dimensional plasmon amplified by an active medium based on a terahertz quantum-cascade structure. It is shown that for realistic parameters of GaAs/AlGaAs structures with quantum wells (mobility 2×105 cm2V-1s-1 at an electron concentration of 5×1011 cm-2 and at temperatures up to 77 K), the gain of a two-dimensional plasmon can reach 1500 cm-1 for frequency 2.3 THz. In addition, due to the strong localization of the plasmon electric field near the quantum well, only a few cascades of the active medium are required for amplification.
Влияние технологии двойного травления под затвор на параметры HEMT транзисторов на подложках GaAs и InP
Authors: Беляков В.А. , Макарцев И.В. , Фефелов А.Г. , Оболенский С.В. , Васильев А.П. , Кузьменков А.Г. , Кулагина М.М. , Малеев Н.А.
Published: July 2021

High electron mobility transistors (HEMTs) have been
developed based on InAlAs/InGaAs heterostructures on an InP
substrate, with a transconductance of about 1000 mS/mm, a
reverse breakdown voltage of more than 10 V and a unity-gain cutoff frequency is 140 GHz. In addition, HEMT transistors based
on AlGaAs/InGaAs/GaAs heterostructures on a GaAs substrate
with double gate recessing technology have been developed. This
transistors demonstrate a maximum measured transconductance
of the current-voltage characteristic of 520 mS/mm, a maximum
drain current of 670 mA/mm, and a gate-drain breakdown voltage
of 14 V and a unity-gain cut-off frequency is 120 GHz. Due to the
increased breakdown voltage, the developed transistors have been
used in monolithic integrated circuits of millimeter-wave power
amplifiers with an output power of more than 110 mW.
Модификация электронных свойств поверхности n-InP(100) сульфидными растворами
Authors: Лебедев М.В. , Львова Т.В. , Смирнов А.Н. , Давыдов В.Ю.
Published: July 2021

Photoluminescence and Raman spectroscopy are used to study the electronic properties of n-InP(100) surfaces passivated with different sulfide solutions. Such a passivation results in the increase in photoluminescence intensity of the semiconductor evidencing for the reduction in the surface recombination velocity. The increase in the photoluminescence intensity is accompanied by the narrowing of the surface depletion layer, as well as by the increase of the electron density in the probed volume of InP. The efficiency of electronic passivation of the n-InP(100) surface depends on the composition of the sulfide solution.
Долинно-орбитальное взаимодействие в германии, легированном донорами V группы: количественный анализ
Authors: Ревин А.А. , Михайлова А.М. , Конаков А.А. , Цыпленков В.В. , Шастин В.Н.
Published: July 2021

In the framework of the envelope function approximation, the wave functions of electrons localized at shallow donors P, As, Sb in Ge are calculated taking into account the valley-orbit coupling caused by the donor short-range potential. It is proposed an approach that makes it possible to include inter-valley mixing in the equation for a multi-component envelope function. The calculation of the effects of the valley-orbit interaction was carried out according to the perturbation theory, while the "bare" single-valley functions were found using the Ritz method. The parameters of the short-range part of the potential and the coefficient of inter-valley mixing were found individually for each donor, making it possible to obtain the best agreement with the results of experimental measurements of the energies of the singlet and triplet states. The envelope functions of the 1s(A1) and 1s(T2) states are calculated. The parameters of the valley-orbit interaction are found for each donor. It is also shown how the functions of the excited 2s, 2p0, 2p±, 3p0 states should be modified in order to remain orthogonal to the singlet and triplet functions within the framework of a more rigorous multivalley model.
Начальные стадии роста полуполярного AlN на наноструктурированной Si(100) подложке
Authors: Бессолов В.Н. , Коненкова Е.В. , Орлова T.А. , Родин С.Н.
Published: July 2021

Методом растровой электронной микроскопии изучались начальные стадии формирования полуполярных AlN(1011) и AlN(1012) слоев при эпитаксии из металлоорганических соединений на подложке Si(100), на поверхности которой сформирована V-образная наноструктура с размером элементов <100 нм (подложка-NP-Si(100)). Показано, что на начальной стадии эпитаксии на подложке-NP-Si(100) происходит формирование зародышевых кристаллов AlN, а затем в зависимости от кристаллографической ориентации V-стенок формируются кристаллы, ограненные плоскостями AlN(1011) на Si(111) или AlN(1012) на Si(111), разориентированном в направлении [110] на 7o. Ключевые слова: полуполярный нитрид алюминия, наноструктурированная подложка кремния.
Проявления процессов резонансного туннелирования и случайных флуктуаций потенциала с участием уровней квантовых точек в релаксации фототока p-i-n GaAs/AlAs-гетероструктур
Authors: Ханин Ю.Н. , Вдовин Е.Е.
Published: July 2021

As a result of studying the relaxation of the photocurrent in p-i-n GaAs / AlAs heterostructures, we discovered/ registered sharp features caused by resonant tunneling through the electronic levels of quantum dots in the barrier layers. It was shown that the time intervals of the manifestation of these resonances on the relaxation curves are determined by the dynamics of charge accumulation at the hole levels of quantum dots and by recombination with their participation.Strong random fluctuations of the photocurrent in the postresonant region, caused by local fluctuations of the residual charge at the hole levels of quantum dots, were also found.The study of relaxation in the medium and long wavelength light ranges confirms our interpretation of the observed effects.
Механизмы, определяющие гистерезис магнитосопротивления гранулярного ВТСП в присутствии парамагнитного вклада, на примере HoBa-=SUB=-2-=/SUB=-Cu-=SUB=-3-=/SUB=-O-=SUB=-7-delta-=/SUB=-
Authors: Семенов С.В. , Гохфельд Д.М. , Терентьев К.Ю. , Балаев Д.А.
Published: July 2021

The hysteretic magnetoresistance of granular high-temperature superconductor (HTSC) HoBa2Cu3O7-δ is investigated. Superconductors of the YBCO family with magnetic rare earth elements (Nd, Ho, Er, Sm, Yb, Dy) in place of yttrium are characterized by a significant paramagnetic contribution to the total magnetization. Impact of this paramagnetic contribution on the magnetotransport properties is analyzed using the concept of an effective field in an intergranular medium. Lines of magnetic induction from paramagnetic moments do not concentrate in intergranular boundaries, and, thus, have an insignificant effect on magnetotransport properties of granular HTSC. At the same time, there are strong concentration of magnetic flux in the intergranular boundaries due to Meissner currents and Abrikosov vortices. This magnetic flux compression determines the magnetotransport properties of granular HTSCs, including YBCO with magnetic rare earth elements.
Проявление низкоразмерного магнетизма в Kα-спектрах C, N, O карбонатов и нитратов, полученных при рентгеноспектральном микрозондовом анализе (РСМА)
Authors: Куликова И.М. , Набелкин О.А. , Иванов В.А. , Филенко И.А.
Published: July 2021

Зарегистрированы первичные CKα-, NKα- и OKα-спектры монокристаллов карбонатов, нитритов и нитратов с помощью метода рентгеноспектрального микрозондового анализа (РСМА). Сдвиг и ширину Kα-линий использовали для установления закономерностей изменений зарядовой и спиновой плотности на излучающем атоме в низкоразмерных магнетиках. Метод позволил экспериментально получить представления о наличии косвенного обменного взаимодействия в исследованных образцах монокристаллах (в том числе микронных размеров) при комнатной температуре. В спектрах азота в нитратах и нитрите в полосе проводимости выявлена структура резонансных уровней (плазмонов). Ключевые слова: Kα-спектры углерода, азота, кислорода, карбонаты, нитраты, нитриты, спиновая плотность, зарядовая плотность, суперобмен, рентгеноспектральный микрозондовый анализ.
Обменное смещение на границе ферро-ферримагнетик в микропроводах PrDyCoFeB/α-Fe
Authors: Коплак O.В. , Дворецкая Е.В. , Королев Д.В. , Валеев Р.А. , Пискорский В.П. , Гапанович М.В. , Погорелец Ю.С. , Моргунов Р.Б.
Published: July 2021

An exchange bias of 50-70 Oe was found in two-component microwires of two types: 1) with an α-Fe shell covering a nanocrystalline PrDyCoFeB core and 2) with a PrDyCoFeB nanocrystalline shell and an α-Fe core spontaneously formed during the solidification of the melt. In this case, the exchange bias is not detected in α-Fe-coated microcrystalline microwires, which mainly consist of the (PrDy) 2 (CoFe) 14B phase. Since, in addition to this phase, nanocrystalline microwires contain ferrimagnetic phases Dy (CoFe) 2 or Dy (CoFe) 4B, the appearance of an exchange bias is explained by the presence of an α-Fe interface with these phases.
Структурные особенности замещенного феррита стронция Sr-=SUB=-1-x-=/SUB=-La-=SUB=-x-=/SUB=-FeO-=SUB=-3-delta-=/SUB=-: I. Sr-=SUB=-2-=/SUB=-LaFe-=SUB=-3-=/SUB=-O-=SUB=-9-delta-=/SUB=-
Authors: Седых В.Д. , Рыбченко О.Г. , Барковский Н.В. , Иванов А.И. , Кулаков В.И.
Published: July 2021

The structural features and Fe valence states in the substituted strontium ferrite Sr2/3La1/3FeO3-δ (or Sr2LaFe3O9-δ) have been studied for different synthesis and heat treatment conditions by X-ray diffraction analysis and Mossbauer spectroscopy.
A series of annealing of Sr2LaFe3O9-δ in vacuum ((10-3 Torr) in the temperature range of 400 - 650оС allowed us to trace the structure evolution from rhombohedral phase (Sr2LaFe3O9) to orthorhombic one (Sr2LaFe3O8) over the formation of intermediate multiphase states and the redistribution of Fe valence states as well.
Мультипористые наночастицы кремнезема с углеродными наноточками: синтез, оптоэлектронные и биомедицинские применения
Authors: Курдюков Д.А. , Еуров Д.А. , Медведев А.В. , Кириленко Д.А. , Томкович М.В. , Шмаков С.В. , Голубев В.Г.
Published: July 2021

Spherical multiporous silica nanoparticles (MSNPs) with a diameter of 50 ± 15 nm containing two types of nanopores with sizes of 0.8–2 nm (type I) and 5–10 nm (type II) are synthesized. The film formed from MSNPs contains pores 10–40 nm in size (type III) as a result of spherical nanoparticles packing. Methods are developed for the selective introduction of dye molecules – propidium iodide (PI), carbon nanodots (CD) 3.5 nm in size, and Ag nanoparticles (20 nm) into pores of types I, II, and III, respectively. The possibility of using MSNP/CD and MSNP/CD/Ag films as phosphors for white light LEDs is demonstrated. It is shown that composite MSNP/CD and MSNP/CD/PI particles are non-toxic and allow visualization of the cell structure (by the example of HeLa) simultaneously in several spectral ranges.
Атомная подвижность в кристаллической фазе наноструктурированного сплава Ga-In со структурой β-Ga
Authors: Нефедов Д.Ю. , Чарная E.В. , Усков A.В. , Aнтоненко A.O. , Подорожкин Д.Ю. , Кумзеров Ю.А. , Фокин А.В.
Published: July 2021

Эвтектический сплав галлия и олова является перспективным материалом для использования в современной микроэлектронике, медицинской диагностике и гибкой робототехнике. В связи с новыми применениями сплава Ga-In, значительный интерес вызывают исследования влияния понижения размеров на свойства этого сплава. В настоящей работе приводятся результаты исследования методом ЯМР атомной подвижности в сегрегированной кристаллической фазе наноструктурированного сплава Ga-In, обогащенной галлием. Сплав с концентрацией 94 at.% Ga и 6 at.% In был введен в поры опаловой матрицы. Показано, что обогащенная галлием фаза имела структуру β-Ga. Проведены измерения температурной зависимости скорости ядерной спин-решеточной релаксации галлия. Разделены вклады магнитного дипольного и электрического квадрупольного механизмов релаксации. Рассчитано изменение с температурой времени корреляции атомного движения и оценена энергия активации. Ключевые слова: Ga-In сплав, наноконфайнмент в опале,  сегрегированная фаза со структурой β-Ga, ЯМР, спин-решеточная релаксация галлия, атомная подвижность.
Особенности процессов переноса заряда в нанокомпозитах на основе полифениленоксида с фуллереном и эндофуллереном
Authors: Кононов А.А. , Никонорова Н.А. , Кастро Р.А.
Published: July 2021

The paper presents the results of studying the processes of electric charge transfer in polymer nanocomposites based on polyphenylene oxide with fullerene C60 (1% and 8%) and with endometallofullerene Fe@C60 (1%) as nanofillers. The existing theoretical models were used to calculate the values of the charge transfer parameters, such as the carrier concentration N, the mean free path Rω, and the height of the potential barrier W. The conductivity type was determined for all samples by analyzing the temperature dependences of the exponent s.
Development and Evaluation of a Virtual Reality Puzzle Game to Decrease Food Intake: Randomized Controlled Trial (Preprint)
Authors: Liu Yunxin , Stamos Angelos , Dewitte Siegfried , van Berlo Zeph M C , van der Laan Laura N
Published: July 2021

BACKGROUND

Virtual reality (VR) has gained popularity in daily life, and VR food cues seem to elicit food cravings, similar to real food cues. However, little is known about the impact of VR food cues on actual food intake.

OBJECTIVE

In real life (RL), exposure to food cues in a situation in which the desire to eat food interferes with the completion of a food-related task reduces the subsequent food intake (ie, the pre-exposure effect). In this study, we examine, on the one hand, whether the pre-exposure effect could be replicated in RL and, on the other hand, whether this effect could be extended to VR contexts.

METHODS

The study used a 2 (stimulus type: food vs nonfood) × 2 (mode: VR vs RL) between-subject design (n=175). Participants were randomly assigned to 1 of the 4 conditions.

RESULTS

We found the main effect of mode on food intake, with a higher food intake after both VR conditions than after RL conditions (P=.02). In addition, among female participants, we found that exposure to both food cues (ie, VR and RL) resulted in lower food intake than exposure to both nonfood cues (P=.05). In contrast, this effect was not observed among male participants (P=.34). Additionally, VR and RL cues generated similar emotional and behavioral responses (eg, arousal and game difficulty).

CONCLUSIONS

We were unable to replicate the exposure effect in our complete sample. Subgroup analyses, however, showed that for women, exposure to food cues (either in VR or in RL) reduces food intake, indicating that a VR pre-exposure procedure may effectively be applied exclusively for women.

CLINICALTRIAL

ClinicalTrials.gov NCT05169996; https://clinicaltrials.gov/ct2/show/NCT05169996
This is a test: (Preprint)
Authors: Account Developer
Published: July 2021

BACKGROUND

This isa test

OBJECTIVE

This isa test

METHODS

This isa test

RESULTS

This isa test

CONCLUSIONS

This isa test

CLINICALTRIAL

This isa test
Asphyxia with a reduced oxygen content in the environment (clinical lecture)
Authors: Yekhalov V.V. , Sedinkin V.A. , Kravets O.V.
Published: July 2021

Asphyxia due to a decrease in oxygen concentration in the inhaled air is not common. Nevertheless, the mass media fairly regularly inform the population about its episodes in wine cellars, silos, and children in closed spaces. Quite a serious problem is exogenous hypoxia in miners as a result of accidents with the release of firedamp, carbon dioxide poisoning of submarine crews in case of failure of ventilation systems. The modern extreme sports enthusiast who are actively engaged in mountain tourism and mountaineering, speleology (including diggers), amateur piloting of sports aircraft and balloons, diving, etc. are subject to such lesions. In the available special literature sources on the topic “Asphyxiation due to a decrease in the concentration of oxygen in the environment”, there are almost no reports related to lifetime pathogenetic characteristics, diagnosis, and the basics of providing medical care to such victims. There are isolated recommendations on the provision of medical care for mountain sickness, while other options for exogenous asphyxia are considered only from the standpoint of forensic medical examination, in most cases — posthumously. Based on isolated domestic and foreign research works, personal theoretical and clinical experience, we have developed an algorithm for diagnosis and medical care at the stages of the route of a victim with exogenous hypoxia.
Infusion and transfusion therapy: main aspects
Authors: Nikonov V.V. , Lyzohub K.I. , Lyzohub M.V.
Published: July 2021

The adequate choice of strategy for infusion therapy is an essential component of successful management of critically ill patients. Infusion therapy is one of the main methods of maintai-ning vital functions of patients in the perioperative period. In the practice of a doctor, there are reasonable doubts about the feasibility and safety of various solutions for infusion therapy. Both are fundamental principles of infusion therapy, and the changes that have taken place, of course, need to be understood from the standpoint of evidence-based medicine. Balanced crystalloid solutions were safe and clinically effective, their use is provided by the Bri-tish Consensus Guidelines on Intravenous Fluid Therapy for Adult Surgical Patients.
Comparative characteristics of COVID-19 vaccines
Authors: Chernyshova L.I. , Chernyshov A.V.
Published: July 2021

Background. The outbreak of the disease, caused by the new coronavirus SARS-CoV-2, began in mid-December 2019 in China. The infection quickly spread around the world and became a global pandemic, causing “the greatest quarantine in human history”. Nevertheless, the pandemic continues, and in some countries, there are repeated waves of rising incidence. Less than 12 months after the onset of the COVID-19 pandemic, several research groups accepted the challenge and developed vaccines that protect against SARS-CoV-2. The purpose was to compare the main vaccines against COVID-19. Materials and methods. Existing instructions for vaccines, intermediate results of vaccine efficacy studies, as well as recommendations of the WHO, EMA, CDC and others were used. A comparative analysis of existing data on COVID-19 vaccines was performed. Results. A comparative description of the composition of vaccines and their mechanism of action, storage temperature, indications and contraindications to vaccination, vaccination regimens and methods of vaccination, vaccination efficacy, side effects, prevention in contact persons and in patients who have become ill has been made. Conclusions. The identified features of the composition of vaccines and their usage can be used in immunoprophylaxis against COVID-19.
Curriculum Experience and Learning Outcomes for Creativity Competence: Empirical Survey of Undergraduates in the Engineering Domain
Authors: Shumin CHEN Professor Amy
Published: July 2021

In the last decades, creativity has been advocated as a key learning process in the engineering domain to advance college students’ abilities in technology and science. Creative education becomes a mantra which is enhanced by educators, politicians, employees, teachers, professors, and students. Creativity competency is viewed as a crucial solution to face the challenges of industrial promotion, human capital investments, and future societal strategies and overcome the social, economic, and educational problems. College students’ competency on creativity represent a series of attributes, behaviors, knowledge, and abilities required for successful learning performance in the engineering domain. This paper discusses on the results of an empirical study on college students’ competences in the engineering domain and their self-evaluation on their perception of creativity and creativity performance. Universities are strongly expected to provide learning opportunities that foster and nurture creativity for students, hence creative education in engineering is an ongoing critical mission for both educational institutes and learners. The research was conducted through a testing questionnaire by theoretical literature review and focus group interviews with experts in engineering and education fields. The samples are tested by the instrument and there were 307 valid samples for analysis. The statistical method includes means, , and the structural equation model. The curriculum experience is the strongest correlation value (r=.55) to affect creativity achievements. The learning styles have an obvious influence on school environments (r=.44), and school environments are shown the same value (r=.45) to curriculum experience. The self-evaluation by students demonstrates that school environmental improvement remains a key agenda for universities to be aware of in developing creative plans and managements for students. The engineering domain is specialized though its professions in the logics of learning along side of maker spirits, and this study leads us to have a clear observation among the various factors which influenced the educational plan or projects for college students. The conclusion provides suggestions for future empirical study and educational plans.
Assessment of Tools and Equipment Utilization for Effective Electric Power Distribution in Yola Electricity Distribution Company, Adamawa State, Nigeria
Authors: Akudo Onwuka Immaculater , Moses Dauda , Agbu Amos Danlami , Salisu Umar
Published: July 2021

The main purpose of this study was to assess the utilization of tools and equipment for effective electric power distribution by Yola Electricity Distribution Company in Adamawa State. Two research questions and two null hypotheses were formulated to guide the study. The study adopted descriptive survey research design. The population of the study was 69 consisting of 46 technicians and 23 supervisors in Yola Electricity Distribution Company. Due to the manageable size of the population, there was no sampling; hence, the whole population was used for the study. A structured questionnaire developed by the researchers titled “Utilization of Tools and Equipment for Effective Distribution of Electricity Questionnaire (UTEEDEQ)” was used as the instrument for data collection. The instrument was validated by three experts and a reliability of 0.89 was obtained using Cronbach Alpha reliability method. Mean and standard deviation was used to answer the research questions while t-test was used to test the null hypotheses at 0.05 level of significance. The finding of the study revealed that Yola Electricity Distribution Company utilizes the following tools for effective distribution of electric power distribution: Ladder, Hand Gloves, Safety Belt, Ammeter, Ohmmeter, Voltmeter, Spanners, Screwdrivers, among others; Yola Electricity Distribution Company utilizes the following equipment for effective distribution of electric power distribution: Supply Voltage Detector, Distribution Transformer, Power Transformer, Battery Rectifier, Supply Voltage, Circuit Breaker, Spring Charger, Trip Circuit, Low Pressure Gas Indicator among other. Based on the findings, the following recommendations were made: YEDC should provide more equipment for effective distribution of electric power especially utility vehicles and other equipment necessary for effective electric power distributions.
IDENTIFICATION OF GABA-PRODUCING LACTIC ACID BACTERIA FROM CINCALOK FERMENTATION BASED ON THE 16S RRNA AND GAD GENES
Authors: PRIBADHI ADHITYA NAUFAL , KUSDIYANTINI ENDANG , FERNIAH REJEKI SITI
Published: July 2021

Objective: The research to identify LAB using 16S rRNA potential as high produce GABA and design primer can amplify that gad gene.

Methods: Isolation genomic form LAB, molecular identification based 16S rRNA, design primer use primer3plus, and use application serial cloner to ensure the primer can amplify to target gene.

Results: That have been carried out based on the analysis of the 16 S rRNA gene have the highest similarity to Weissella confusa strain JCM 1093 with a similarity of 98.38%, while the results of the analysis of the gad gene with several primers that have been designed are not able to amplify the gad gene owned by W. confusa.

Conclusion: The results of the analysis based on the 16S rRNA gene for lactic acid bacteria were obtained by Weissella confusa. However, for the results of identification analysis based on the gad gene, the designed primers were unable to amplify the gad gene in W. confusa.
POSSIBLE INFLUENCE OF LOXOPROFEN IN LIPOPOLYSACCHARIDE INDUCED ALTERATIONS IN SUCROSE INTAKE IN CHRONIC MILD STRESS MODEL IN MICE
Authors: S KUNDU SMITA , G RANA DIGVIJAYSINH
Published: July 2021

Objective: The objective of the present study was to evaluate the influence of Loxoprofen in sucrose intake in the absence and presence of Lipopolysaccharide in chronic mild stress model of depression in mice.

Methods: There was a measurement of sucrose intake in chronic mild stress model (CMS), consisting of 21 days stress schedule in which mice were subjected to the treatment of Loxoprofen (16.8 mg/kg, p.o.) with or without treatment of lipopolysaccharide (LPS) (0.5 mg/kg i.p.) for the past 14 days.

Results: The result of the present study indicated that mice treated with Venlafaxine and Loxoprofen showed a significant increase in the sucrose intake in stressed mice in chronic mild stress model. LPS-treated mice presented a decrease in sucrose intake when compared to controls. Similarly, Venlafaxine and Loxoprofen in the presence of LPS could increase the sucrose intake as compared to LPS treated stressed mice.

Conclusion: The results of the present study showed that Loxoprofen could influence LPS induced alterations in sucrose intake in mice in chronic mild stress model. It can also indicate the possible anti-depressant effect of Loxoprofen in mice subjected to chronic mild stress model of depression, having its possible implication in future treatment of depression.
PSYCHOLOGICAL DISTRESS EXPERIENCES OF INDIAN POPULATION DURING CORONAVIRUS DISEASE PANDEMIC SOCIAL ISOLATION AND LONELINESS: A CROSS-SECTIONAL STUDY
Authors: GOEL DIVYA , FAROOQ MAJID
Published: July 2021

Objective: The sudden emergence of wide spread of the coronavirus disease 2019 (COVID-19) pandemic has led to adoption of physical distancing or lockdown all over the globe to curtail the viral transmission. Although lockdown plays an important role, at the same time, it can adversely affect the psychological health of the population. In addition, because of stay at home order, people are more inclined to use the media which can further aggravate the mental health issues in population. This study was planned to study the perceived psychological issues associated with the COVID-19 pandemic lockdown.

Methods: An online social survey was conducted using semi-structured questionnaire, participants were added through snowball sampling technique.

Results: A total of 455 people (264 females and 191 males) participated in the study. Majority of participants 228 (50.1%) felt stressed out during coronavirus lockdown period. Female gender was associated with greater negative psychological impact of lockdown. Most participants 263 (57.8%) were worried about the health of the loved ones. Most of the participants tried to seek information from different media. The difference between the stress level was highly significant (p=0.04639∗) between the participants depending on the duration for which they explore the information on different media.

Conclusion: COVID-19 pandemic was associated with stress in the majority of people in our sample, and media has a role to modulate the psychological impact of this lockdown. As COVID-19 pandemic is still ongoing, we need to verify these findings on larger population and policy-makers need to strengthen our mental health programs to mitigate the psychological impact of this pandemic.
INSIGHTS INTO CORONA/CORONAVIRUS DISEASE 2019 PANDEMIC – OPINION VERSUS EVIDENCE
Authors: S PARTHASARATHY , SUNDARARAJAN MONISHA , A MANIMARAN
Published: July 2021

The pandemic of coronavirus disease 2019 (COVID-19) struck the globe in December 2019, killing lakhs of people and it is continuing in many countries to create havoc. There are lakhs of publications creating evidence about the management of the disease. After seeing thousands of cases, we formed opinions in each field of management and these findings may look more logical. We accept that our opinions differ subtly from the evidence. Regarding the transmission of the disease, it is spread from person to person through inhaled aerosols. If this is going to be 100% true, then the need for personal protective equipment covering the legs seems illogical. Povidone-iodine is antiviral and spreading the same as an ointment inside the nose must be effective to decrease viral load. The other antivirals with questionable efficiency like remdesivir are being used frequently, especially in the pulmonary phase. There are no clear-cut guidelines for primary contacts. Any protective drug intake could have decreased the transmission. It’s a simple logic that the act of sneezing will decrease the viral load. The practice of inhaling turmeric smoke to induce sneezing in the outdoor could have decreased the viral load. We opine that a lymphopenia of <15% can predict a worse outcome in the next 2 days. A computerized computed tomography scan of the chest is to be taken 7 days after the onset of symptoms as the disease usually enters the pulmonary phase only then. The date of onset of symptoms rather than the positive testing date should be considered for timeline management of the case. The undue tachycardia in the 1st week and desaturation below 92% in the 2nd week are the warning signs. The steroids are to be usually prescribed after the 5–6 days. The roles of psychiatric counseling and nutrition were largely underplayed.
A PILOT STUDY FOR EVALUATION OF ROLE OF B-MODE ULTRASOUND AND STRAIN ELASTOGRAPHY IN DIFFERENTIATING BENIGN AND MALIGNANT BREAST MASSES
Authors: GUPTA SARYU , KAUR MANPREET , KAUR AMARJIT , BHATIA KULDEEP
Published: July 2021

Background: Early detection of malignant lesions is critical key stone for the successful management of breast cancer. Conventional B-mode ultrasound although could not replace the histopathology which is still gold standard, plays an important role in the diagnostic pathways by using the Breast Imaging Reporting and Data System (BIRADS) lexicon (standardized by American College of Radiology [ACR]). Although characterization of solid breast masses by sonography has improved greatly since the early 1990s, specificity remains low and a large number of biopsies result in benign diagnosis. Strain elastography and strain ratio (SR) are recent techniques which may help in increasing the specificity of ultrasound.

Methods: The present study was a pilot study aimed to establish a correlation between B-mode ultrasound and strain elastography in differentiating benign and malignant breast masses and to compare the results of B- mode ultrasound and Strain Elastography with fine-needle aspiration cytology/ biopsy findings. It was a prospective study conducted in the Department of Radio-diagnosis of Rajindra Hospital, Patiala. A total of 40 patients who presented with the complaint of palpable breast lump were evaluated with B-Mode Ultrasonography (USG) and Strain elastography (using elastography score [ES] and SR).

Results: The study group (40 patients with breast lumps) comprised 38 (95%) female patients and 2 (5%) male patients. Among the group 29 were benign and 11 were malignant. Fibroadenoma followed by fibrocystic disease was the most common benign pathologies and invasive ductal carcinoma followed by Ductal Carcinoma in situ was the most common malignant pathologies. Sensitivity, specificity, and diagnostic accuracy of B-Mode USG in diagnosing palpable breast lump are 72.7%, 86.2%, and 82.5%, respectively, while that of strain elastography in diagnosing palpable breast lump are 81.8%, 93.10%, and 90.0%, respectively. Using strain ratio (SR) only the sensitivity, specificity, and diagnostic accuracy was found to be 93.1%, 100%, and 95% better than B-Mode USG and shear elastography alone separately and combined. The mean SR for a benign mass is 2.00±0.97 and for a malignant mass is 5.40±1.55.

Conclusion: Ultrasound elastography (using ES) has a higher sensitivity, specificity and diagnostic accuracy in differentiating benign and malignant breast masses then B mode USG (using BIRADS). Using SR alone has shown better sensitivity, specificity, and diagnostic accuracy but its standalone or in combination diagnostic application has to be followed up with further studies.
Bases normativas para un protocolo de atención a usuarios indígenas en los tribunales chilenos
Authors: Francesconi Lavinia , Villegas Díaz Myrna
Published: July 2021

Latinoamerican Normative Systems generally recognize indigenous peoples’ rights; by doing so, they have created a specific area of legal study. In some places where those rights are better developed, support judicial services were implemented in order to meet the needs and specific cultural characteristics of indigenous community members. The comparison between these normative systems, along with international and Chilean national law, allow to identify the normative foundations that might sustain the drafting of an attention protocol for the components of the indigenous community before Chilean courts and tribunals, which can eventually contribute to minimize the existing inequality gap.