bluuebunny/crossref_metadata_2025 huggingface dataset:
Microscopic and spectroscopic bioassociation study of uranium(VI) with an archaeal Halobacterium isolate
Authors: Hilpmann Stephan , Bader Miriam , Steudtner Robin , Müller Katharina , Stumpf Thorsten , Cherkouk Andrea
Published: January 2022

The safe disposal of high-level radioactive waste in a deep geological repository is a huge social and technical challenge. So far, one of the less considered factors needed for a long-term risk assessment, is the impact of microorganisms occurring in the different host rocks. Even under the harsh conditions of salt formations different bacterial and archaeal species were found, e. g. Halobacterium sp. GP5 1–1, which has been isolated from a German rock salt sample. The interactions of this archaeon with uranium(VI), one of the radionuclides of major concern for the long-term storage of high-level radioactive waste, were investigated. Different spectroscopic techniques, as well as microscopy, were used to examine the occurring mechanisms on a molecular level leading to a more profound process understanding. Batch experiments with different uranium(VI) concentrations showed that the interaction is not only a simple, but a more complex combination of different processes. With the help of in situ attenuated total reflection Fourier-transform infrared spectroscopy the association of uranium(VI) onto carboxylate groups was verified. In addition, time-resolved laser-induced luminescence spectroscopy revealed the formation of phosphate and carboxylate species within the cell pellets as a function of the uranium(VI) concentration and incubation time. The association behavior differs from another very closely related halophilic archaeon, especially with regard to uranium(VI) concentrations. This clearly demonstrates the importance of studying the interactions of different, at first sight very similar, microorganisms with uranium(VI). This work provides new insights into the microbe-uranium(VI) interactions at highly saline conditions relevant to the long-term storage of radioactive waste in rock salt.
How does the presence of a surgical face mask impair the perceived intensity of facial emotions?
Authors: Tsantani Maria , Podgajecka Vita , Gray Katie L. H. , Cook Richard
Published: January 2022

The use of surgical-type face masks has become increasingly common during the COVID-19 pandemic. Recent findings suggest that it is harder to categorise the facial expressions of masked faces, than of unmasked faces. To date, studies of the effects of mask-wearing on emotion recognition have used categorisation paradigms: authors have presented facial expression stimuli and examined participants’ ability to attach the correct label (e.g., happiness, disgust). While the ability to categorise particular expressions is important, this approach overlooks the fact that expression intensity is also informative during social interaction. For example, when predicting an interactant’s future behaviour, it is useful to know whether they are slightly fearful or terrified, contented or very happy, slightly annoyed or angry. Moreover, because categorisation paradigms force observers to pick a single label to describe their percept, any additional dimensionality within observers’ interpretation is lost. In the present study, we adopted a complementary emotion-intensity rating paradigm to study the effects of mask-wearing on expression interpretation. In an online experiment with 120 participants (82 female), we investigated how the presence of face masks affects the perceived emotional profile of prototypical expressions of happiness, sadness, anger, fear, disgust, and surprise. For each of these facial expressions, we measured the perceived intensity of all six emotions. We found that the perceived intensity of intended emotions (i.e., the emotion that the actor intended to convey) was reduced by the presence of a mask for all expressions except for anger. Additionally, when viewing all expressions except surprise, masks increased the perceived intensity of non-intended emotions (i.e., emotions that the actor did not intend to convey). Intensity ratings were unaffected by presentation duration (500ms vs 3000ms), or attitudes towards mask wearing. These findings shed light on the ambiguity that arises when interpreting the facial expressions of masked faces.
Comparative analysis of DNA extraction and PCR product purification methods for cervicovaginal microbiome analysis using cpn60 microbial profiling
Authors: Shvartsman Elinor , Richmond Meika E. I. , Schellenberg John J. , Lamont Alana , Perciani Catia , Russell Justen N. H. , Poliquin Vanessa , Burgener Adam , Jaoko Walter , Sandstrom Paul , MacDonald Kelly S.
Published: January 2022

Background

The microbiota of the lower female genital tract plays an important role in women’s health. Microbial profiling using the chaperonin60 (cpn60) universal target (UT) improves resolution of vaginal species associated with negative health outcomes compared to the more commonly used 16S ribosomal DNA target. However, the choice of DNA extraction and PCR product purification methods may bias sequencing-based microbial studies and should be optimized for the sample type and molecular target used. In this study, we compared two commercial DNA extraction kits and two commercial PCR product purification kits for the microbial profiling of cervicovaginal samples using the cpn60 UT.

Methods

DNA from cervicovaginal secretions and vaginal lavage samples as well as mock community standards were extracted using either the specialized QIAamp DNA Microbiome Kit, or the standard DNeasy Blood & Tissue kit with enzymatic pre-treatment for enhanced lysis of gram-positive bacteria. Extracts were PCR amplified using well-established cpn60 primer sets and conditions. Products were then purified using a column-based method (QIAquick PCR Purification Kit) or a gel-based PCR clean-up method using the QIAEX II Gel Extraction Kit. Purified amplicons were sequenced with the MiSeq platform using standard procedures. The overall quality of each method was evaluated by measuring DNA yield, alpha diversity, and microbial composition.

Results

DNA extracted from cervicovaginal samples using the DNeasy Blood and Tissue kit, pre-treated with lysozyme and mutanolysin, resulted in increased DNA yield, bacterial diversity, and species representation compared to the QIAamp DNA Microbiome kit. The column-based PCR product purification approach also resulted in greater average DNA yield and wider species representation compared to a gel-based clean-up method. In conclusion, this study presents a fast, effective sample preparation method for high resolution cpn60 based microbial profiling of cervicovaginal samples.
An evidence-based definition of anemia for singleton, uncomplicated pregnancies
Authors: Zofkie Amanda C. , Garner W. Holt , Schell Rachel C. , Ragsdale Alexandra S. , McIntire Donald D. , Roberts Scott W. , Spong Catherine Y.
Published: January 2022

Background

The definition for anemia in pregnancy is outdated, derived from Scandinavian studies in the 1970’s to 1980’s. To identity women at risk of blood transfusion, a common cause of Severe Maternal Morbidity, a standard definition of anemia in pregnancy in a modern, healthy United States cohort is needed.

Objective

To define anemia in pregnancy in a United States population including a large county vs. private hospital population using uncomplicated patients.

Materials and methods

Inclusion criteria were healthy women with the first prenatal visit before 20 weeks. Exclusion criteria included preterm birth, preeclampsia, hypertension, diabetes, short interval pregnancy (<18 months), multiple gestation, abruption, and fetal demise. All women had iron fortification (Ferrous sulfate 325 mg daily) recommended. The presentation to care and pre-delivery hematocrits were obtained, and the percentiles determined. A total of 2000 patients were included, 1000 from the public county hospital and 1000 from the private hospital. Each cohort had 250 patients in each 2011, 2013, 2015, and 2018. The cohorts were compared for differences in the fifth percentile for each antepartum epoch. Student’s t-test and chi-squared statistical tests were used for analysis, p-value of ≤0.05 was considered significant.

Results

In the public and private populations, 777 and 785 women presented in the first trimester while 223 and 215 presented in the second. The women at the private hospital were more likely to be older, Caucasian race, nulliparous, and present earlier to care. The fifth percentile was compared between the women in the private and public hospitals and were clinically indistinguishable. When combining the cohorts, the fifth percentile for hemoglobin/hematocrit was 11 g/dL/32.8% in the first trimester, 10.3 g/dL/30.6% in the second trimester, and 10.0 g/dL/30.2% pre-delivery.

Conclusions

Fifth percentile determinations were made from a combined cohort of normal, uncomplicated pregnancies to define anemia in pregnancy. Comparison of two different cohorts confirms that the same definition for anemia is appropriate regardless of demographics or patient mix.
Detection of COVID-19 in smartphone-based breathing recordings: A pre-screening deep learning tool
Authors: Alkhodari Mohanad , Khandoker Ahsan H.
Published: January 2022

This study was sought to investigate the feasibility of using smartphone-based breathing sounds within a deep learning framework to discriminate between COVID-19, including asymptomatic, and healthy subjects. A total of 480 breathing sounds (240 shallow and 240 deep) were obtained from a publicly available database named Coswara. These sounds were recorded by 120 COVID-19 and 120 healthy subjects via a smartphone microphone through a website application. A deep learning framework was proposed herein that relies on hand-crafted features extracted from the original recordings and from the mel-frequency cepstral coefficients (MFCC) as well as deep-activated features learned by a combination of convolutional neural network and bi-directional long short-term memory units (CNN-BiLSTM). The statistical analysis of patient profiles has shown a significant difference (p-value: 0.041) for ischemic heart disease between COVID-19 and healthy subjects. The Analysis of the normal distribution of the combined MFCC values showed that COVID-19 subjects tended to have a distribution that is skewed more towards the right side of the zero mean (shallow: 0.59±1.74, deep: 0.65±4.35, p-value: <0.001). In addition, the proposed deep learning approach had an overall discrimination accuracy of 94.58% and 92.08% using shallow and deep recordings, respectively. Furthermore, it detected COVID-19 subjects successfully with a maximum sensitivity of 94.21%, specificity of 94.96%, and area under the receiver operating characteristic (AUROC) curves of 0.90. Among the 120 COVID-19 participants, asymptomatic subjects (18 subjects) were successfully detected with 100.00% accuracy using shallow recordings and 88.89% using deep recordings. This study paves the way towards utilizing smartphone-based breathing sounds for the purpose of COVID-19 detection. The observations found in this study were promising to suggest deep learning and smartphone-based breathing sounds as an effective pre-screening tool for COVID-19 alongside the current reverse-transcription polymerase chain reaction (RT-PCR) assay. It can be considered as an early, rapid, easily distributed, time-efficient, and almost no-cost diagnosis technique complying with social distancing restrictions during COVID-19 pandemic.
Analysis of critical report notification from musculoskeletal radiology in a tertiary academic medical institution with a regional trauma center
Authors: Ahn Tae Ran , Jeong Yu Mi , Park So Hyun , Jeon Ji Young , Lee Sheen-Woo , Shim Young Sup
Published: January 2022

Purpose

We aimed to analyze the prevalence, causes, and clinical settings of 4-year critical radiologic reports (CRRs) notified from the musculoskeletal section of the radiology department. Then, we investigated the communication outcomes.

Methods

This study was approved by our institutional review board. We retrospectively included 175 musculoskeletal CRRs from our database between January 2017 and December 2020. The CRRs were analyzed by two musculoskeletal radiologists, who categorized the CRRs by clinical setting (emergency department(ED) patient, outpatient, and inpatient), body part, type of image modality, reason for CRR, incidental lesion, and clinical outcome. The clinical outcome was retrieved from the electronic medical records.

Results

The 175 musculoskeletal CRRs accounted for 5.4% of the CRRs (n = 3217) available in the study period. Most CRRs (94.9%, 166/175) corresponded to the musculoskeletal system, while the remaining ones (5.1%, 9/175) corresponded to the non-musculoskeletal system. In addition, the spine, extremities, and thoracic cage accounted for 52.6%, 40.6%, and 1.7% of the musculoskeletal CRRs, respectively. Moreover, most patients presented to the ED (50.3%, 88/175), followed by inpatients (30.9%, 54/175), and outpatients (18.9%, 33/175). The CRR reasons included missed fracture (54.3%), suspected malignancy (16%), clinical emergency (10.3%), unexpected infection/inflammation (11.4%), and others (8%). Furthermore, 11 (6.3%) incidental lesions were not related to the primary imaging purpose. Referring clinicians actively acknowledged 80% of the CRRs. The loss to follow-up action was the highest in the ED patients (35.2%, 31/88; p < 0.001), being significantly higher than that in outpatients (6.1%, 2/33) and inpatients (3.7%, 2/54).

Conclusion

Missed fractures were the most common cause of musculoskeletal CRRs. ED showed prevalence in musculoskeletal CRRs and reflected the highest loss to follow-up action. ED physicians should pay more attention to CRRs to enhance patient care.
Oral anticoagulant treatment after bioprosthetic valvular intervention or valvuloplasty in patients with atrial fibrillation—A SWEDEHEART study
Authors: Christersson Christina , Held Claes , Modica Angelo , Westerbergh Johan , Batra Gorav
Published: January 2022

Aims

To describe the prevalence of atrial fibrillation (AF), use of oral anticoagulants (OAC) and change in antithrombotic treatment patterns during follow-up after valve intervention with a biological prosthesis or valvuloplasty.

Methods and results

All patients with history of AF or new-onset AF discharged alive after valvular intervention (biological prosthesis or valvuloplasty) between 2010–2016 in Sweden were included (n = 7,362). Information about comorbidities was collected from national patient registers. Exposure to OAC was based on pharmacy dispensation data. In total 4,800 (65.2%) patients had a history of AF, and 2,562 (34.8%) patients developed new-onset AF, with 999 (39.0%) developing new-onset AF within 3 months after intervention. The proportion of patients with biological valve prosthesis was higher in patients with new-onset AF compared to history of AF (p<0.001). CHA2DS2-VASc score ≥2 was observed in 83.1% and 75.5% patients with history of AF and new-onset AF, respectively. Warfarin was more frequently dispensed than NOAC at discharge in patients with history of AF (43.9% vs 7.3%), and in patients with new-onset AF (36.6% vs 17.1%). Almost half of the AF population was not dispensed on any OAC at discharge (48.8% in patients with history of AF and 46.3% in patients with new-onset AF).

Conclusion

In this real world study of patients with AF and recent valvular intervention, risk of new-onset AF after valvular intervention is high emphasizing need for frequent rhythm monitoring after intervention. A considerable undertreatment with OAC was observed despite being indicated for the majority of the patients. Warfarin was the OAC most frequently dispensed.
The dynamics of mitochondrial-linked gene expression among tissues and life stages in two contrasting strains of laying hens
Authors: Dreyling Clara , Hasselmann Martin
Published: January 2022

The cellular energy metabolism is one of the most conserved processes, as it is present in all living organisms. Mitochondria are providing the eukaryotic cell with energy and thus their genome and gene expression has been of broad interest for a long time. Mitochondrial gene expression changes under different conditions and is regulated by genes encoded in the nucleus of the cell. In this context, little is known about non-model organisms and we provide the first large-scaled gene expression analysis of mitochondrial-linked genes in laying hens. We analysed 28 mitochondrial and nuclear genes in 100 individuals in the context of five life-stages and strain differences among five tissues. Our study showed that mitochondrial gene expression increases during the productive life span, and reacts tissue and strain specific. In addition, the strains react different to potential increased oxidative stress, resulting from the increase in mitochondrial gene expression. The results suggest that the cellular energy metabolism as part of a complex regulatory system is strongly affected by the productive life span in laying hens and thus partly comparable to model organisms. This study provides a starting point for further analyses in this field on non-model organisms, especially in laying-hens.
Comparing the timeliness and adequacy of antenatal care uptake between women who married as child brides and adult brides in 20 sub-Saharan African countries
Authors: Adedini Sunday A. , Abatan Sunday Matthew , Ogunsakin Adesoji Dunsin , Alex-Ojei Christiana Alake , Babalola Blessing Iretioluwa , Shittu Sarafa Babatunde , Odusina Emmanuel Kolawole , Ntoimo Lorretta Favour C.
Published: January 2022

Context

Considering the persistent poor maternal and child health outcomes in sub-Saharan Africa (SSA), this study undertook a comparative analysis of the timing and adequacy of antenatal care uptake between women (aged 20–24 years) who married before age 18 and those who married at age 18 or above.

Method

Data came from Demographic and Health Surveys of 20 SSA countries. We performed binary logistic regression analysis on pooled data of women aged 20–24 (n = 33,630).

Results

Overall, the percentage of child brides in selected countries was 57.1%, with the lowest prevalence found in Rwanda (19.1%) and the highest rate in Chad (80.9%). Central and West African countries had the highest prevalence of child marriage compared to other sub-regions. Bivariate results indicate that a lower proportion of child brides (50.0%) had 4+ ANC visits compared to the adult brides (60.9%) and a lower percentage of them (34.0%) initiated ANC visits early compared to the adult brides (37.5%). After controlling for country of residence and selected socio-economic and demographic characteristics, multivariable results established significantly lower odds of having an adequate/prescribed number of ANC visits among women who married before age 15 (OR: 0.63, CI: 0.57–0.67, p<0.001), and women who married at ages 15–17 (OR: 0.81, CI: 0.75–0.84, p<0.001) compared to those who married at age 18+. Similar results were established between age at first marriage and timing of first ANC visit. Other interesting results emerged that young women who married earlier than age 18 and those who married at age 18+ differ significantly by several socio-economic and demographic characteristics.

Conclusion

Efforts to improve maternal and child health outcomes in SSA must give attention to address the underutilization and late start of antenatal care uptake among child brides.
EBV+ tumors exploit tumor cell-intrinsic and -extrinsic mechanisms to produce regulatory T cell-recruiting chemokines CCL17 and CCL22
Authors: Jorapur Aparna , Marshall Lisa A. , Jacobson Scott , Xu Mengshu , Marubayashi Sachie , Zibinsky Mikhail , Hu Dennis X. , Robles Omar , Jackson Jeffrey J. , Baloche Valentin , Busson Pierre , Wustrow David , Brockstedt Dirk G. , Talay Oezcan , Kassner Paul D. , Cutler Gene
Published: January 2022

The Epstein-Barr Virus (EBV) is involved in the etiology of multiple hematologic and epithelial human cancers. EBV+ tumors employ multiple immune escape mechanisms, including the recruitment of immunosuppressive regulatory T cells (Treg). Here, we show some EBV+ tumor cells express high levels of the chemokines CCL17 and CCL22 both in vitro and in vivo and that this expression mirrors the expression levels of expression of the EBV LMP1 gene in vitro. Patient samples from lymphoblastic (Hodgkin lymphoma) and epithelial (nasopharyngeal carcinoma; NPC) EBV+ tumors revealed CCL17 and CCL22 expression of both tumor cell-intrinsic and -extrinsic origin, depending on tumor type. NPCs grown as mouse xenografts likewise showed both mechanisms of chemokine production. Single cell RNA-sequencing revealed in vivo tumor cell-intrinsic CCL17 and CCL22 expression combined with expression from infiltrating classical resident and migratory dendritic cells in a CT26 colon cancer mouse tumor engineered to express LMP1. These data suggest that EBV-driven tumors employ dual mechanisms for CCL17 and CCL22 production. Importantly, both in vitro and in vivo Treg migration was effectively blocked by a novel, small molecule antagonist of CCR4, CCR4-351. Antagonism of the CCR4 receptor may thus be an effective means of activating the immune response against a wide spectrum of EBV+ tumors.
lucha contra el terrorismo en Argentina: a propósito de la causa por el atentado a la AMIA y conexas
Authors: Saráchaga Gonzalo
Published: January 2022

El terrorismo constituye un flagelo que acapara la atención mundial, y se ha convertido en una de las grandes amenazas en este siglo XXI. Dadas las características que presenta el terrorismo internacional, y los compromisos y obligaciones asumidos por los diversos países a través de la firma de acuerdos al respecto, a ninguno de ellos les resulta ajeno este problema. Argentina ha sufrido, por ejemplo, dos atentados de tamaña importancia como han sido el ataque terrorista a la embajada de Israel y a la AMIA en la década del 90, aún impunes.

Por ello, partiendo de la notoria importancia que posee este tema tanto en el plano internacional como en Argentina, en el presente trabajo intentaremos centrar el estudio del terrorismo en este país, ciñéndolo a algunas cuestiones relevantes que se derivan de una de las causas por el atentado a la AMIA. Más precisamente, aquella vinculada con la denuncia incoada por el Ex Fiscal Alberto Nisman por intento de encubrimiento de la investigación a los imputados del atentado.
La reclamación contra el deudor en el concurso exprés
Authors: Lara González Rafael , Armendáriz Íñigo Juan Martín
Published: January 2022

El patrimonio sin contenido económico realizable bastante plantea el problema de su propia existencia en el tráfico jurídico, puesto que el acreedor ostenta la legítima expectativa al cobro de su crédito a la vez que el deudor precisa de una seguridad que permita actuar ante tamaño escenario. La doctrina ha abordado esta enrevesada situación, donde la respuesta de los operadores jurídicos, primero, vacilante, ahora ya clara, para, precisamente, aliviar escenarios angustiosos que ni a unos, ni a otros, satisfacía en absoluto. Precisamente, la situación de excesivo celo tuitivo ha propiciado su análisis por la Resolución de la Dirección General de los Registros y del Notariado de 2 de septiembre de 2019 evitando, de una vez por todas, que este escenario confuso, a modo de inextricable jerigonza, dibuje un retrato bizantino que, no solo a los actores, sino particularmente a la economía, conviene atajar favoreciendo el emprendimiento y, sobre todo, la dignidad de la persona. Asimismo, la reciente Resolución de la Dirección General de Seguridad Jurídica y Fe Pública de 4 de octubre de 2021 ahonda en esta cuestión.
Changes in the energy production to reduce the environmental impact
Authors: Hornyák Gábor , Bencs Péter
Published: January 2022

One of the most debated topics of our time is climate change. For
this reason, the European Union and the countries of the world are taking
several steps to reduce and reverse the effect. When we talk about climate
change or sustainable development, it is very important to also talk about
the energy sector. The European Union aims to achieve climate neutrality by
2050, which will require significant changes in our lives, it will be a
major challenge for mankind. In 2019, fossil fuels accounted for 80% of the
world’s energy production. The production of energy from fossil fuels has
several negative effects aside from climate change. When fossil fuels are
burned, gases and particles harmful to human health are released into the
air and some of the fossil fuels are raw materials to produce plastics, for
example. If we use it for energy production, we waste our raw materials.
What are the options for reducing the environmental impact? How can
coal-based energy production be replaced? What are other ways to reduce the
environmental impact? These topics are discussed in the article.
Investigation of layer height influencing the impact strength of
polylactic acid (PLA)
Authors: Lennert József Richárd , Sárosi József
Published: January 2022

The aim of this study is to investigate the effect of layer height
used during 3D printing on the impact strength, their standard deviations,
and the printing time by using UNI EN ISO 180 unnotched specimens
manufactured by FDM 3D printing technology. Every specimen is made of PLA,
which is the most basic material of the FDM printing technology by using
the same 3D printer. In this study it plays a key role to find out whether
the layer height can be used to optimize the researched mechanical property
within an economical framework or not. What is more, the possibly
observable tendencies and crucial influential parameters will be analysed
as well.
The Dynamic Changes of White Blood Cell Count and Lymphocyte Count and Compare their Levels in the Early Stage of Covid-19
Authors: Wang Ling
Published: January 2022

COVID-19 is a new infectious disease, which needs to explore the clinical value of white blood cell count and lymphocyte to provide help for diagnosis and treatment.COVID-19 cases were Selected that admitted to 2 hospitals in Guizhou, China. WBC and LYM in the 1st day, in the 4th day and in the 7th day after onset were collected. There were not any differences in The WBC and LYM in the 4th day and the 7th day between the two groups.WBC and LYM in the 1st day in the moderate group were lesser than in the mild group. WBC and LYM were no dynamic changes in the mild group. In moderate group, WBC and LYM in the 1st day were lesser than in the 4th day. The levels in the 4th day and the 7th day were no differences. The conclusion was In the early stage of COVID-19, the WBC and LYM in moderate patients were significantly decreased within 4 days after onset, and could be restored to normal level after 4-7 days. However, no dynamic changes were observed in mild patients within 7 days.
THE USE GUIDED DRILLING PIPES FOR VARIOUS PURPOSES
Authors: Myskin M. I.
Published: January 2022

The proposed installation provides control and monitoring of the parameters of the cutting tool during deep drilling of pipes for various purposes due to the controller and sensors, which are mounted on special equipment designed for processing deep holes. Installed sensors control such parameters as tool rotation, feed, part rotation, runout on the outer surface of the part, and the wall thickness of the part during processing. Movement of the cutting tool of the drilling head, in which a sensor for monitoring the thickness difference is installed using a lubricating and cooling liquid supplied to the head as a contact medium, which ensures the operation of the sensor for monitoring the wall thickness. The controller processes the data received from all sensors, and sends a pulse signal, thereby making appropriate adjustments to the operation of the entire installation.
ENERGY AND ECOLOGICAL ASPECTS OF ROASTING OF BULK LIGHTWEIGHT MATERIALS IN ELECTRIC FURNACES
Authors: Nizhegorodov A. I. , Kalyagina E. S.
Published: January 2022

The article studies the energy and ecological aspects of the process of roasting of vermiculite and other lightweight materials in electric modular-firing furnaces which are alternatives to fired furnaces using hydrocarbon fuel. A double industrial electric furnace with a series-parallel interface of modules having auxiliary equipment is described. It forms a technological system for processing vermiculite concentrates and conglomerates. Energy and environmental performance indicators (efficiency, heat losses, and specific energy intensity) are assessed for these types of furnaces. The methods for collecting and accumulating useful resources – finely dispersed materials formed when vermiculite swells in new electric furnaces – are described.
METHODOLOGICAL SUPPORT FOR THE ORGANIZATION OF EXAMS IN TECHNICAL DISCIPLINES DURING DISTANCE EDUCATION
Authors: Kondakov A. I. , Zaitsev A. V.
Published: January 2022

Current realities have revealed an urgent need for the development and improvement of distance forms of educational processes. The most important of which are to control and obtain assessments of the knowledge of the examinees who are not in direct physical contact with the examiner. This article presents the results of a review and analysis of various forms of organization of distance examinations in technical disciplines. There are revealed the main disadvantages of each form of organization of the remote exam, including those that do not allow recommending them for widespread, widespread use. There is considered in detail physical implementation of the most simple form of conducting a distance exam, called “Assignment by e-mail”. This form has been used many times when organizing remote exams at the BMSTU and can be successfully implemented in educational institutions that do not have their own sufficient experience in distance education.
ASSESSMENT OF THE STABILITY OF CARBON FIBER TO THE ACTION OF TRANSVERSE LOADS TAKING INTO ACCOUNT TIME AND CLIMATE FACTORS
Authors: Zlobina I. V.
Published: January 2022

The relevance of research in the development of physical methods for increasing the stability of products made of polymer composite materials (PCM) to the influence of environmental factors, taking into account its duration, is shown. The influence of exposure of carbon fiber samples on an epoxy matrix in the natural conditions of the climate zone of Saratov on the change in the limit stresses of three-point bending was studied. Comparative tests of samples premodified in a microwave electromagnetic field with a frequency of 2.45 GHz with an energy flux density (17…18)×104 µw/cm2 were performed. It is shown that the influence of environmental factors leads to a decrease in the limit stresses by (3,7…10,4) % depending on the exposure. Modification of carbon fiber in the cured state in the microwave electromagnetic field reduces the negative influence of the external environment by reducing the strength by (44.3…73) %. It was found that the strengthening effect of microwave modification increases with increasing exposure from 6 % to 11.5 % under the accepted experimental conditions, while the uniformity of the bending strength values in the batch increases significantly, which is manifested in a decrease in the coefficient of variation of limit stresses by (70.2…77.8) %. Functional dependencies in the form of 2nd-order polynomials are obtained, allowing with confidence (98…99) % predict the stability of products made of modified carbon fiber during long-term operation under the influence of environmental factors.
COMBINED EXTRUSION OF GLASSES WITH A CONICAL BOTTOM. KINEMATIC AND STRESS STATES OF THE PLASTIC AREA LOCATED UNDER THE CENTRAL FLAT SURFACE OF THE PUNCH
Authors: Vorontsov A. L. , Lebedeva D. A.
Published: January 2022

For extrusion of glasses with a conical bottom using the method of plastic flow by A. L. Vorontsov, the kinematic and stress states of the extruded metal in the area of the plastic deformation center located under the central flat surface of the punch were determined. The formulas for the deforming force and the height of the zone of plastic deformation are obtained. In the future, the results of this mechanical and mathematical analysis will make it possible to formulate a scientifically grounded methodology for calculating the main technological parameters of extrusion of nozzles with a conical bottom, as well as to investigate the issue of the presence of the taper of the punch, which is optimal in strength.
COMBINED EXTRUSION OF GLASSES WITH A CONICAL BOTTOM. METHODOLOGY FOR CALCULATING TECHNOLOGICAL PARAMETERS OF THE TRADITIONAL FREE EXTRUSION PROCESS
Authors: Vorontsov A. L. , Lebedeva D. A.
Published: January 2022

The method of calculating the energy-power and deformation parameters of the traditional process of free extrusion of glasses with a conical bottom part, including preliminary formation of the outer conical section of the bottom part of the product by molding and the following reverse extrusion of the glass with an internal cavity of the required geometry. The extrusion of both non-hardening and hardening material is considered. In the latter case, the account of the hardening of the extruded material is described in detail. The above formulas allow us to determine such important parameters of the stamping process as total and specific deforming force, maximum pressure on the die wall, and an increase in the yield stress.
Combined EXTRUSION OF GLASSES WITH A CONICAL BOTTOM. METHODOLOGY FOR CALCULATING TECHNOLOGICAL PARAMETERS OF CONSTRAINED EXTRUSION AT INITIAL DEFORMATION BY BENDING
Authors: Vorontsov A. L. , Lebedeva D. A.
Published: January 2022

The methodology for calculating the energy-power and deformation parameters of the process of constrained extrusion of glasses with a conical bottom part, starting with the bend of the workpiece. The extrusion of both non-hardening and hardening material is considered. In the latter case, the account of the hardening of the extruded material is described in detail. The above formulas allow us to determine such important parameters of the stamping process as total and specific deforming force, maximum pressure on the die wall, and an increase in the yield stress.
Pengembangan Strategi Pada Aktivitas Rantai Nilai Panas Bumi (Studi Pada PT Geo Dipa Energi (Persero))
Authors: Ayuningtyas Maharani , Harianto Harianto , Safari Arief
Published: January 2022

Indonesia's geothermal potential is the second largest in the world. But in fact, the magnitude of its geothermal potential has not been utilized optimally. With investments and risks that are quite high, and a relatively long period of time makes investors do not much invest in this energy sector. Especially with the presence of single buyer, in this case is PT PLN (Persero). The issue of power purchase agreement between developers and PT PLN (Persero) is still become the biggest obstacle to the development of geothermal power plant. This study aims to formulate an appropriate strategy priority used by PT Geo Dipa Energi (Persero) in producing the optimal cost of generating electricity based on Minister of Energy and Mineral Resources Regulation Number 50 of 2017 concerning Utilization of Renewable Energy Sources for Electricity Supply. Data collection uses judgment sampling techniques. External environmental analysis is carried out through PESTLE analysis, while internal environmental analysis is carried out through value chain analysis. TOWS analysis is conducted to provide an alternative strategies, that from choices of alternative strategies will be prioritized using AHP analysis. The results of the study produced the chosen strategy priority that is to conduct intensive coordination with PT PLN (Persero) in negotiations to develop a new prospect area.
Strategi Manajemen Pemeliharaan untuk Mengoptimalkan Kontribusi Pada Kinerja Perusahaan (Studi Kasus pada PT Indonesia Power UP.Semarang)
Authors: Alfian Sabila Dandy , Mahfudz Mahfudz
Published: January 2022

Tujuan penelitian ini adalah untuk tujuan dalam penelitian ini adalah untuk  mengevaluasi kinerja pemeliharaan dalam memberikan kontribusi menjaga kesiapan, kehandalan, dan effisiensi unit Pembangkit Listrik. Narasumber dalam studi ini adalah Manajer Pemeliharaan, Supervisor Senior Perencanaan, Pengendalian dan Evaluasi Pemelihraan, Kepala Divisi. Data dikumpulkan dengan metode kualitatif wawancara mendalam dan observasi. Data dianalisis menggunakan Fishbone Diagram. Berdasarkan analisa yang dilakakuan ditemukan bahwa faktor penyebab utama gangguan operasi pembangkit dibagi menjadi dua, penyebab yang pertama diluar kendali management UP Semarang seperti life time machine, pola operasi start-stop, anggaran pemeliharaan yang terbatas. Faktor yang kedua sebenarnya masih dapat dikendalikan management UP Semarang dari aspek people dan methode. kontribusi manajemen pemeliharaan terhadap kinerja perusahaan belum optimal untuk mencapai perbaikan substansial, kelemahannya ada pada tata kelola WPC karena kurang konsisten dalam pelaksanaannya, sedangkan upaya yang telah dilakukan belum maksimal untuk mencapai optimalisasi terhadap kinerja perusahaan karena setiap elemen proses masih kurang sinergi. Berdasarkan hasil kesimpulan, dapat dilakukan impikasi kebijakan dengan meningkatkan metode pemeliharaan dan membenahi kualitas SDM serta leadership.
Implementation of Accrual Base Accounting to Improve Accountability: A Case of Gambia
Authors: Conteh Saikou , Hamidah Hamidah
Published: January 2022

Public sector changes in Gambia started within the 1980s with the essential objective of moving forward the adequacy, effectiveness, and straightforwardness of governmental operational and financial administration. This paper was executed by adopting qualitative research method to obtain it findings. This paper points to look at the opportunities and accountability by the Gambian public sector in executing accrual-based accounting. A survey of past writing in this range appeared that accrual-based accounting improves decision-making processes, advances way better financial administration, and enhances public accountability. Be that as it may, the move handle between these two accounting strategies isn't without challenges. Human resources competency, software and technology capability, accounting policies, and measures appropriateness are recognized as major challenges within the usage effort. These challenges should be taken into thought carefully by the government in order to guarantee effective movement towards accrual-based accounting.
Scenario Planning Approach for PT. ViewTron Indonesia in Developing it’s Business in Indonesia
Authors: Syukriadi Loethano Novi , Sunitiyoso Yos
Published: January 2022

A market report says that the projectors’ business is growing promisingly over the next five years, globally. Asia Pacific market is a region that shows an increasing sales trend. In Indonesia, PT. ViewTron (the name is made vague due to confidentiality), an importing projectors company established in 2018, is growing significantly. However, due to the Covid-19 pandemic, the sales volume dropped drastically. The management is concerned about the future business of the company in Indonesia and what best strategies to deal with such future uncertainties. The scenario planning approach is selected to address the management’s concerns. A qualitative research methodology is used to analyze the situations that affect the company. A 2x2 matrix of scenario framework is developed reflecting critical uncertainties that might affect future business of PT ViewTron. The scenario shows the plausibility of future situations and offers strategy options for the company to manage the implications of each scenario. Before the occurrence of a scenario, the management should define early warning signals to alert the company on which scenario it is heading toward and what actions to take. By setting thorough scenario planning, the management could develop strategies that may envision future business uncertainties confidently.
Inflation Effect on Unemployment in Indonesia: A Comparative Studies Between Sharia and Conventional Economic Perspectives
Authors: Suharti Sri , Naufal Muhammad Dzaki , Paiman Farah Ladina
Published: January 2022

This study discusses the effect of inflation on unemployment by comparing the perspective of Islam with capitalism. The purpose of this study is to identify the driving factors that cause inflation and unemployment. This research is conducted using descriptive analysis through linear regression analysis on Indonesia’s unemployment and inflation data from 2001 to 2019. This study found that inflation was not the main contributor to unemployment and only accounted for 18.6% of unemployment, whereas the remaining 80.4% was caused by other factors. This occurs because the increase in prices are not due to aggregate demand, but due to natural and man-made factors. To overcome inflation, the government should create policies to promoting a culture of saving, investing and discouraging wasteful and excessive spending from early age and improve the morale of officials and entrepreneurs. In addition to that, the government can also implement the law firmly and consistently to all parties who commit unethical behaviour; second, increasing the role of the community to observe and report corruption. To reduce the rate of unemployment, the government can implement several policies. Those are implementing policies that make it easier for startups to obtain capital, create investment security and facilitate licensing bureaucracy; second, providing more free and accessible work training courses, especially in urban areas; third, implement 12-year compulsory education consistently.
Pengaruh Keadilan Organisasional Terhadap Kinerja Karyawan Dimediasi LMX (Leader-Member Exchange) Dilihat dari Aspek Gender
Authors: Widya Alifah , Tjahjono Heru Kurnianto , Mustafa Zainal , Prajogo Wisnu
Published: January 2022

The purpose of this article is to examine the mediating role of leader-member exchange in the relationship between organizational justice and employee performance in terms of gender. This article focuses on ATLM (Medical Laboratory Technologist) regarding organizational justice practices and the Leader-Member Exchange relationship and how these perceptions predict employee performance and how it affects employee gender. The sample used was 191 ATLM in type C hospitals in the D.I. Yogyakarta and Central Java. The results of this study will help ATLM to foster greater employee value and teamwork among employees by implementing organizational justice practices.
Pengaruh Website, Ewom, E-Trust Terhadap E-Repurchase Pemesanan Hotel Melalui Pegipegi di Kota Semarang
Authors: Lesmanawati Diana , Farida Naili
Published: January 2022

Penelitian ini bertujuan untuk menganalisis faktor-faktor yang dapat mempengaruhi              e-repurchase. Website, E-WOM dan E-trust adalah faktor-faktor yang dapat mempengaruhinya. Responden yang merupakan konsumen yang melakukan pemesanan hotel melalui Pegipegi di Kota Semarang akan diteliti melalui faktor website, E-WOM dan e-trust yang akan mempengaruhi e-repurchase.Jenis penelitian ini menggunakan penelitian eksplanatif, dengan populasi sebanyak 100 responden yang melakukan pemesanan hotel melalui Pegipegi di Kota Semarang dengan cara purposive sampling. Data dikumpulkan melalui kuesioner dengan pengukuran skala Likert. Metode analisis data menggunakan PLS.Hasil dari penelitian ini adalah karakteristik website mempengaruhi e-WOM dan e-trust dengan hubungan positif. Dan e-WOM memiliki pengaruh yang positif pula terhadap e-trust. Penelitian ini menyimpulkan bahwa e-WOM dan e-trust memiliki pengaruh yang positif terhadap e-repurchase.
Meningkatkan Kinerja Pemasaran Melalui Entrepreneurial Marketing (Studi Pada UKM Makanan dan Minuman di Semarang Jawa Tengah)
Authors: Muafa Irfan Wildzan , Ferdinand Augusty Tae , Indriani Farida
Published: January 2022

Penelitian ini dilakukan untuk menguji pengaruh dari variabel Pemasaran Kewirausahaan terhadap Kinerja Pemasaran pada UKM makanan dan minuman di Kota Semarang, Jawa Tengah  melalui variabel Kecepatan Inovasi, Nilai Layanan, dan  Keunggulan Posisi. Penelitian ini mengambil sebanyak 150 responden pemilik UKM makanan dan minuman di Semarang, Jawa Tengah.Alat analisis yang digunakan adalah SEM (Structural Equation Modelling) versi 21. Hasil analisis data untuk keseluruhan model telah memenuhi kriteria Goodness Of Fit dengan nilai chi square = 172,114, derajat kebebasan = 165, probabilitas = 0,336, CMIN/DF = 1,043, GFI = 0,887, AGFI = 0,856, TLI = 0,990, CFI = 0,991 dan RMSEA = 0,017. Dengan demikian dapat dikatakan bahwa model penelitian yang diajukan dapat diterima.Dari hasil penelitian diketahui bahwa ada pengaruh yang signifikan antara Pemasaran Kewirausahaan dengan Kecepatan Inovasi, Pemasaran Kewirausahaan dengan Nilai Layanan, Kecepatan Inovasi dengan Keunggulan Posisi, Nilai Layanan dengan Keunggulan Posisi, dan Keunggulan Posisi dengan Kinerja Pemasaran.
Pengaruh Daya Tarik Wisata, Kepekaan Lingkungan, dan Kepuasaan Layanan Terhadap Keterikatan Tempat Serta Implikasinya Pada Sikap Berprilaku Bertanggung Jawab Lingkungan
Authors: Putra Wahyu Heryanto , Saputra Fachri Eka
Published: January 2022

This study aims to examine the effect of destination attractiveness, environmental sensitivity, satisfaction with interpretive services, toward place attachment. This study also aims to identify the effect of place attachment to environmental responsible behaviour. This study was using questionnaire as data collection method. The total sample of this study was 400 respondents. However, the number of questionnaires that can be processed was 398. The data were proccesed using PLS SEM (Partial Least Square). The result were obtained in this study: (1) destination attractiveness influences positive significant place attachment (2) environmental sensitivity influences positive significant place attachment (3) satisfaction with interpretive services influences positive significant place attachment (4) place attachment influences positive significant environmental responsible behaviour (5) destination attractiveness influences positive significant environmental responsible behaviour (6) environmental sensitivity influences positive significant environmental responsible behaviour (7) satisfaction with interpretive services influences positive significant environmental responsible behaviour. This research contributes to the literature on tourism marketing.
Analysis of Antecedents Variables of Financial Behavior Intention: An Empirical Study
Authors: Rahma Stephanie , Chandra Novi , Sihombing Sabrina
Published: January 2022

This research aims to examine relationship between antecedents’ variables of financial behavior intention. This research involves 350 respondents which were collected through online questionnaire. Data was examined by reliability and validity tests before hypotheses testing. Hypotheses testing were applied by using structural equation modeling. All research hypotheses were supported except the hypothesis that stated the relationship between perceived control and financial behavior intention. This research provides discussion, conclusion, limitations and recommendation for future research.
Analisis Faktor yang Memengaruhi Green Purchase Intention dan Green Customer Behavior (Studi Kasus Pada Produk Tumblr Starbucks)
Authors: Tarigan Nikita Fauziah , Huda Nurul , Nazwirman Nazwirman
Published: January 2022

The purpose of this study was to examine the factors of green purchase intention and green customer behaviour by using attitude, subjective norms, behavioral control, and religiosity to use tumblr starbucks on millennials generation. Based on a literature review, this research hypothesis states that attitudes, behavioural control, and religiosity affect green purchase intention. This study uses survey data from questionnaires to 195 respondents. Hypothesis testing techniques are done by using SEM analysis with Smart PLS software. The results of data processing indicate that the Attitude Variable, Behavioural Control, and Religiosity have a significant influence on the green purchase intention to use tumblr of starbucks. Green purchase intention variable has a significant effect on behaviour using electronic money with a t value of 3.152. Religiousity variables and attitude have a greater influence on the green purchase intention to use tumblr than other variables.