bluuebunny/crossref_metadata_2025_split huggingface dataset:
Test de potencial emprendedor: adaptación al español (ATE-S)
Authors: Bernal Guerrero Antonio , Cárdenas Gutiérrez Antonio Ramón , Athayde Rosemary 
Published: April 2021

INTRODUCCIÓN. El potencial emprendedor (enterprise potential) constituye una compleja realidad, dinámica e inherente a los sujetos, vinculada a la acción de emprender en determinadoscontextos y situaciones. El desarrollo de la educación emprendedora ha generado interés por lacreación de instrumentos que midan el impacto de los programas formativos sobre el potencialemprendedor, aunque la población comprendida en edad escolar obligatoria aún no ha sido objeto de estudio. El Attitude Toward Enterprise Test (ATE) es una conocida prueba, ideada por Rosemary Athayde, que evalúa el potencial emprendedor. El propósito del estudio ha sido adaptar el ATE al español en una muestra de Educación Secundaria Obligatoria, puesto que no existen pruebas de evaluación análogas en esta etapa de la enseñanza. MÉTODO. La adaptación del ATE-S se hizo con una muestra de 1.440 sujetos, donde un 52.8% fueron alumnos y un 47.2% alumnas, con una M=14.6 años. En primer orden, se realizó un estudio de la dimensionalidad de los 30 ítems mediante un análisis factorial exploratorio (AFE), encontrando una estructura factorial de cinco dimensiones con 22 ítems, a diferencia de la versión original del ATE. En segundo lugar, se efectuó un análisis factorial confirmatorio (AFC) mediante estimación de máxima verosimilitudrobusta. Por último, se estudiaron su fiabilidad y su validez. RESULTADOS. Se confirmó una estructura pentafactorial con un factor de segundo orden (potencial emprendedor). El modelo presenta un buen ajuste (GFI=.998; CFI=.994; TLI=.987; RMSEA=.069; SMRA=.08). La fiabilidad de las puntuaciones es mayor que la de la versión original y se ha demostrado su validez. DISCUSIÓN. Esta investigación ha aclarado la estructura factorial del ATE en su versión española con buenas propiedades psicométricas y una estructura factorial consolidada.
Evaluation of the efficacy of foam sclerosant after addition of glycerine on human great saphenous vein: histological and immunohistochemical study
Authors: Sawaby A , Maklad S , Atta I , El Abd A , Mady MM , Solaiman AAM 
Published: April 2021

Introduction Several treatment modalities have been postulated to improve the efficacy of varicose vein treatment. Addition of glycerine to the sclerosing material has been documented to increase its viscosity and subsequently prolong the duration of stability, in addition to the direct sclerosing effect of glycerine. This histological and immunohistochemical study investigated the efficacy of addition of glycerine 72% to sclerotherapy on the human varicose vein. Methods After surgical stripping of great saphenous veins, three equal segments were resected between two clamps. Specimen 1 was injected with saline only, specimen 2 was exposed to foam sclerosant 2%, and specimen 3 was exposed to a mixture of foam sclerosant 2% and glycerine 72%. All segments were left for 5min. Vein segments were then processed for histological and immunohistochemical study. Results Microscopically, haematoxylin and eosin-stained specimen 1 showed endothelial swelling, cytoplasmic eosinophilia and pyknotic nuclei. The media showed sarcoplasm vacuolisation and necrosis. Specimen 3 showed hypereosinophilic sarcoplasm of the smooth muscle fibres. Oedema was less evident, with a relative decrease in the thickness of the wall compared with specimen 2. Immunohistochemically, the expression of smooth muscle actin was weak in specimen 3 compared with specimens 1 and 2. Expression of CD31 antibody was much reduced in specimen 2 which showed conserved islands of endothelial cells. By contrast, there was a complete loss of endothelial cells in specimen 3. Conclusion Addition of glycerine 72% to foam sclerosant has a more damaging effect on human vein wall.
Libro: El arte de no enseñar lengua
Authors: Rius-Escudé Agnès 
Published: April 2021

Reseña del libro de Francisco José Cantero, que es un material para reflexionar sobre la competencia estratégica y comunicativa y, a su vez, una herramienta esencial y básica para practicar en el arte de comunicarse en las asignaturas de didáctica de la lengua cambiando las funciones del profesor de lengua.
Efficient and wideband acousto-optic modulation on thin-film lithium niobate for microwave-to-photonic conversion
Authors: Hassanien Ahmed E. , Link Steffen , Yang Yansong , Chow Edmond , Goddard Lynford L. , Gong Songbin 
Published: April 2021

Microwave photonics, a field that crosscuts microwave/millimeter-wave engineering with optoelectronics, has sparked great interest from research and commercial sectors. This multidisciplinary fusion can achieve ultrawide bandwidth and ultrafast speed that were considered impossible in conventional chip-scale microwave/millimeter-wave systems. Conventional microwave-to-photonic converters, based on resonant acousto-optic modulation, produce highly efficient modulation but sacrifice bandwidth and limit their applicability for most real-world microwave signal-processing applications. In this paper, we build highly efficient and wideband microwave-to-photonic modulators using the acousto-optic effect on suspended lithium niobate thin films. A wideband microwave signal is first piezoelectrically transduced using interdigitated electrodes into Lamb acoustic waves, which directly propagates across an optical waveguide and causes refractive index perturbation through the photoelastic effect. This approach is power-efficient, with phase shifts up to

0.0166

rad
/
√
mW

over a 45 μm modulation length and with a bandwidth up to 140 MHz at a center frequency of 1.9 GHz. Compared to the state-of-the-art, a

9
×

more efficient modulation has been achieved by optimizing the acoustic and optical modes and their interactions.
Superior performance of a 2  kHz pulse Nd:YAG laser based on a gradient-doped crystal
Authors: Wei Meng’en , Cheng Tingqing , Dou Renqin , Zhang Qingli , Jiang Haihe 
Published: April 2021

Herein, we report a homemade new Nd:YAG crystal rod that contains a gradient dopant of 0.39–0.80 at.%

Nd

3
+

from end to end, achieving superior performance of a 2 kHz Nd:YAG pulse laser at 1064 nm. The optical-to-optical conversion efficiency reached 53.8%, and the maximum output power of the laser was 24.2 W, enhanced by 35.9% compared with a uniform crystal rod with the same total concentration of

Nd

3
+

. Significantly, our experiments revealed that the gradient concentration crystal produced a relatively even pumping distribution along the rod axis, greatly reducing the temperature gradient as well as having a smaller thermal effect. The pump and thermal distribution smoothing obviously improved the features of laser oscillation and output.
The Implementation of Mimosa Pudica Root Extract for Anthracnose Disease On Red Chili to Increase Productivity
Authors: Eviyanti Arifah 
Published: April 2021

Red chili is one of the important horticultural crops, both for domestic consumption and export commodity. Referring to the Indonesian agricultural information sistem (2016), the national consumption of red chili increases 2 % annually. Problems that occur in the cultivation of red chili plants in Indonesia is a disruption of pests and diseases. One of the diseases found in red chili plants is anthracnose disease caused by the fungi Colletotrichum sp marked spots. To control this disease, farmers usually use liquid chemical fungicide which is sprayed on red chili fruit continuously. A permanent use of the chemical fungicides can lead to pathogenic resistance, environmental damage and is harmful to consumers’ health. It means that we need to establish a sustainable agriculture of-which the developed products are not only renewable but also environment friendly. Therefore, in this research have a purpose to analyze the effect of Mimosa pudica root extract for anthracnose disease on red chili to increase farmers productivity. This research use method field study, which conducted on the chili land owned by farmer in Sukoharjo, Central Java. Which is done by giving Mimosa pudica root extract to the chili affected by anthracnose marked by spots, then compare after giving Mimosa pudica root extract. The study was conducted by spraying the extracts of Mimosa pudica root extract with concentration 0%, 25%, 50%, 75% and 100% (repeated 3 times) to the chilies. These results showed that the concentration of 25% was best result, proven by the results average spotting size before being given Mimosa pudica root extract is 2 cm then after being given Mimosa pudica root extract reduced to 1.3 cm. So the conclusion is Mimosa pudica root extract with concentration 25% can be an alternative vegetable fungicide to control anthracnose disease in red chili to increase productivity.
Von der Sammlung von Zeitzeugnissen zur Mehrung kulturellen Kapitals: Zeitspendenarbeit in deutschen Museen
Authors: Walz Markus 
Published: April 2021

ZusammenfassungUnentgeltliche Museumsarbeit begleitet die gesamte Museumsgeschichte, sie garantiert die Vielfalt und Menge der deutschen Museen. Museen allein auf Zeitspendenbasis bestehen neben Museen, deren Verantwortliche in ihrer Freizeit hauptberufliches Personal anleiten, und hauptberuflichen Museumsleitungen mit Zeitspenden-Team. Dieses Neben- und Miteinander funktioniert bis hin zu Fördervereinen als leistungsstarken Betriebspartnern des Museums. Gelegentlich klingt gegenüber Zeitspendenpersonal Misstrauen an; ein zukünftiges Problem mag in dessen einseitiger Sozialstruktur liegen.
Im Spannungsfeld zwischen Zweckrationalität und Idealismus – Eine Analyse des Fachdiskurses zu Projekt DEAL mit Fokus auf den Begriff „Open Access“
Authors: Weisweiler Nina Leonie 
Published: April 2021

ZusammenfassungAufgrund der stetig steigenden Lizenzkosten für wissenschaftliche Literatur gibt es eine international geführte Diskussion über die Transformation des wissenschaftlichen Publikationssystems in den Open-Access-Modus. Der vorliegende Beitrag betrachtet ein prominentes Beispiel dieser Debatte: Er untersucht den Fachdiskurs zu den Verhandlungen der wissenschaftspolitischen InitiativeProjekt DEALmit den drei größten WissenschaftsverlagenElsevier,Springer NatureundWiley. Die Analyse konzentriert sich insbesondere auf das Konzept „Open Access“ mit seinen unterschiedlichen Implikationen und Deutungsvarianten. Unter Verwendung theoretischer Kategorien aus der Wissenssoziologischen und der Kritischen Diskursanalyse werden über 200 online verfügbare Dokumente systematisch kontextualisiert und analysiert und die wichtigsten Phänomene bzw. Probleme aus den Texten herausgearbeitet und zusammengefasst. Eine Aufstellung der beteiligten Akteure sowie eine Chronik relevanter Ereignisse dienen zur Kontextualisierung. Die Diskursanalyse verdeutlicht, dass sich in der Debatte umProjekt DEALprimär über finanzielle Fragen und konkrete Umsetzungsmodelle gestritten wird, während ethisch motivierte Argumente und Fragestellungen früherer Open-Access-Initiativen in den Hintergrund rücken.
Evaluation of different almond (Terminalia catappa) extracts against oxidative stress induced by cyclosporine in brain and liver of rats
Authors: Dada Felix Abayomi , Oyeleye Sunday Idowu , Adefegha Stephen Adeniyi , Babatola Leye Jonathan , Adebayo Adeniyi 
Published: April 2021

Abstract

Objectives
This study was designed to evaluate the ameliorative effect of almond (Terminalia catappa) leaf (ALE) and stem bark (ABE) extracts on the enzyme activities and oxidative stress markers in the brain and liver tissues of cyclosporine-A (CsA) stressed male albino rats.

Methods
Eighty-eight adult male rats weighing between 200 and 220 g were randomly distributed to into 11 groups (n=8) and different doses (100 and 200 mg/kg bwt.) of ALE and ABE were administered through oral gavages to the normal rats and 50 mg/kg/bwt/day CsA-stressed, while normal control rats was given a saline solution (p.o), and the treatment lasted for 14 days. Blood plasma, liver and brain tissues were prepared for biochemical analysis.

Results
Neuronal [acetylcholinesterase (AChE) and butrylcholinesterase (BChE) and arginase] enzyme activities and thiobarbituric acid reactive species (TBARS) level, plasma aspartate transferase (AST), alanine aminotransferase (ALT) and alkaline phosphatase (ALP) activities, liver non-protein thiol (NPSH) level were analyzed. The results revealed that, the administration of CsA induced a significant increase in neuronal AChE, BChE, arginase, TBARS level, but decreased nitric oxide (NO) level. CsA also increased ALT, AST, and ALP activities in the blood plasma of CsA stress rats compared to normal control, but were significantly reversed respectively (p<0.001) upon treatment with the ALE and ABE dose-dependently.

Conclusions
The study revealed that ALE and ABE could prevent neuronal dysfunction and liver toxicity induced by CsA administration, however, higher dose (200 mg/kg) of the studied extracts appears to be more potent.
Cis-regulatory elements in conserved non-coding sequences of nuclear receptor genes indicate for crosstalk between endocrine systems
Authors: Cruz Maria Araceli Diaz , Lund Dan , Szekeres Ferenc , Karlsson Sandra , Faresjö Maria , Larsson Dennis 
Published: April 2021

Abstract
Nuclear receptors (NRs) are ligand-activated transcription factors that regulate gene expression when bound to specific DNA sequences. Crosstalk between steroid NR systems has been studied for understanding the development of hormone-driven cancers but not to an extent at a genetic level. This study aimed to investigate crosstalk between steroid NRs in conserved intron and exon sequences, with a focus on steroid NRs involved in prostate cancer etiology. For this purpose, we evaluated conserved intron and exon sequences among all 49 members of the NR Superfamily (NRS) and their relevance as regulatory sequences and NR-binding sequences. Sequence conservation was found to be higher in the first intron (35%), when compared with downstream introns. Seventy-nine percent of the conserved regions in the NRS contained putative transcription factor binding sites (TFBS) and a large fraction of these sequences contained splicing sites (SS). Analysis of transcription factors binding to putative intronic and exonic TFBS revealed that 5 and 16%, respectively, were NRs. The present study suggests crosstalk between steroid NRs, e.g., vitamin D, estrogen, progesterone, and retinoic acid endocrine systems, through cis-regulatory elements in conserved sequences of introns and exons. This investigation gives evidence for crosstalk between steroid hormones and contributes to novel targets for steroid NR regulation.
The effect of cooling rate on crystallization behavior and tensile properties of CF/PEEK composites
Authors: Dai Guangming , Zhan Lihua , Guan Chenglong , Huang Minghui 
Published: April 2021

Abstract
In this study, the differential scanning calorimetry (DSC) tests were performed to measure the nonisothermal crystallization behavior of carbon fiber reinforced polyether ether ketone (CF/PEEK) composites under different cooling rates. The characteristic parameters of crystallization were obtained, and the nonisothermal crystallization model was established. The crystallization temperature range of the material at different cooling rates was predicted by the model. The unidirectional laminates were fabricated at different cooling rates in the crystallization temperature range. The results showed that the crystallization temperature range shifted to a lower temperature with the increase of cooling rate, the established nonisothermal crystallization model was consistent with the DSC test results. It is feasible to shorten the cooling control range from the whole process to the crystallization range. The crystallinity and transverse tensile strength declined significantly with the increase of the cooling rate in the crystallization temperature range. The research results provided theoretical support for the selection of cooling conditions and temperature control range, which could be applied to the thermoforming process of semi-crystalline polymer matrixed composites to improve the manufacturing efficiency.
Tissue-specific glucose partitioning and fat content in prediabetes and type 2 diabetes: whole-body PET/MRI during hyperinsulinemia
Authors: Eriksson Jan W , Visvanathar Robin , Kullberg Joel , Strand Robin , Skrtic Stanko , Ekström Simon , Lubberink Mark , Lundqvist Martin H , Katsogiannos Petros , Pereira Maria J , Ahlström Håkan 
Published: April 2021

Objective
To obtain direct quantifications of glucose turnover, volumes and fat content of several tissues in the development of type 2 diabetes (T2D) using a novel integrated approach for whole-body imaging.

Design and methods
Hyperinsulinemic–euglycemic clamps and simultaneous whole-body integrated [18F]FDG-PET/MRI with automated analyses were performed in control (n = 12), prediabetes (n = 16) and T2D (n = 13) subjects matched for age, sex and BMI.

Results
Whole-body glucose uptake (Rd) was reduced by approximately 25% in T2D vs control subjects, and partitioning to brain was increased from 3.8% of total Rd in controls to 7.1% in T2D. In liver, subcutaneous AT, thigh muscle, total tissue glucose metabolic rates (MRglu) and their % of total Rd were reduced in T2D compared to control subjects. The prediabetes group had intermediate findings. Total MRglu in heart, visceral AT, gluteus and calf muscle was similar across groups. Whole-body insulin sensitivity assessed as glucose infusion rate correlated with liver MRglu but inversely with brain MRglu. Liver fat content correlated with MRglu in brain but inversely with MRglu in other tissues. Calf muscle fat was inversely associated with MRglu only in the same muscle group.

Conclusions
This integrated imaging approach provides detailed quantification of tissue-specific glucose metabolism. During T2D development, insulin-stimulated glucose disposal is impaired and increasingly shifted away from muscle, liver and fat toward the brain. Altered glucose handling in the brain and liver fat accumulation may aggravate insulin resistance in several organs.
Liver displacement caused by distended stomach in Parkinsonian patient
Authors: Magyar Máté , Glasz Tibor , Kovács Tekla , Deák András Bálint , Maurovich-Horvat Pál , Futácsi Balázs 
Published: April 2021

AbstractGastroparesis, a form of gastrointestinal dysfunction and the increased risk for aspiration pneumonia are well known complications in patients with Parkinson’s disease. In our case report we demonstrate the case of an 83-year-old, bedridden male patient with Parkinson’s disease, who had a slowly progressing stomach dilation, gradually pushing the otherwise normal liver to a highly unusual craniodorsally rotated position.
Second tumors in children with hematological malignancies
Authors: Susuleva N. A. , Valiev T. T. , Martynova N. S. , Mikhaylova S. N. 
Published: April 2021

Background. Hemoblastoses treatment success in children made it possible to cure the vast majority of patients. The follow-up period exceeds tens of years, during which the problem of second tumors (ST) becomes urgent. The objective of the study was to characterize ST in patients who underwent a malignant tumor of hematopoietic and lymphoid tissues at the age of 0 to 18 years.Materials and methods. The study included 64 patients with ST development in the period from 1 to 38 years.Results. Most frequently ST developed after treatment of Hodgkin's lymphoma (45.3 %) and acute lymphoblastic leukemia (35.9 %), supported by high cumulative doses of alkylating agents and radiation therapy. Among STs, in 35.9 % of cases, thyroid cancer was diagnosed, in 10.9 % - acute leukemia, in 9.4 % - tumors of the central nervous system. The results of ST treatment are significantly worse than those of primary tumors. Thus, of 64 patients with ST, 46 (71.9 %) are alive, death from ST progression was noted in 18 (28.1 %) cases.Conclusion. Improvement of modern treatment protocols aimed at reducing the indications for radiation therapy and cumulative doses of alkylating agents, along with the development of effective follow-up programs for children cured of hematological malignancies, will probably help reduce the ST incidence.
EXPERIMENTAL INVESTIGATION ON M-SAND AND BASALT FIBER IN M25 GRADE CONCRETE
Authors: Et. al. Ms.S.Dhivya, 
Published: April 2021

Concrete is the majorly used materials in all type of construction activites. It need a quality sources for obtaining good quality. It can achieve by only proper usage of these at appropriate quantities. Basalt fiber is a fiber when added provides an additional strength. The work carried in this project, replace fine aggregate with M-sand and basalt fiber as an additive to cement in various percentages. The determination of the compressive, flexural and tensile strength of M25 grade concrete is studied. The fine aggregate is completely replaced with M-sand and basalt fiber is added in 0%, 0.5%, 1% and 1.5%. Thus the changes in their compressive, flexural and tensile strength is observed for 14 days and 28 days and results are formulated and the optimum content of basalt fiber to be utilized for production of quality concrete is founded.
Three-Phase Three-Level Isolated DC-DC Soft Switching Converter For Solar Applications
Authors: Et. al. K.Girinath Babu, 
Published: April 2021

Three-level isolated DC-DC converter is an attractive topology in high input voltage applications, which can provide the voltage stress of the power devices to only a half of the dc voltage and also reduce the size of dc filter requirement. But major limitations in the existing three level ZVS converter topologies are brought out with an increased inductance in the primary side and it required to provide complete ZVS of all primary devices down to light loads. By employing an external inductance in the primary of the transformer, total leakage inductance of the transformer increases which is required for realization of soft switching of the converter switches but there are some disadvantages of connecting external inductance in the primary of the transformer. To overcome all these drawbacks, the three-phase three-level isolated DC-DC soft switching converter has been proposed in order to reduce voltage and current stresses. This converter topology requires less number of control switches and operates with an asymmetrical duty cycle control. The proposed three level DC-DC converters provide two- level voltage waveform before dc output filter, which significantly reduce the size of dc output filter. The proposed work has been implemented using MATLAB/SIMULINK and the performance of the proposed converter is verified through simulation results.
A SURVEY ON FREQUENT ITEM SET MINING FOR LARGE TRANSACTIONAL DATA
Authors: Et. al. Divvela Srinivasa Rao, 
Published: April 2021

In the decision making process the Data Analytics plays an important role. The Insights that are obtained from pattern analysis gives many benefits like cost cutting, good revenue, and better competitive advantage. On the other hand the patterns of frequent itemsets that are hidden consume more time for extraction when data increases over time. However less memory consumption is required for mining the patterns of frequent itemsets because of heavy computation. Therefore, an algorithm required must be efficient for mining the patterns of the frequent itemsets that are hidden which takes less memory with short run time. This paper presents a review of different algorithms for finding Frequent Patterns so that a more efficient algorithm for finding frequent items sets can be developed.