bluuebunny/crossref_metadata_2025 huggingface dataset:
Evaluation of the Properties of Humus Liquid of Earthworm Eisenia Foetida Obtained from Different Rachis
Authors: Gaibor FernÃ¡ndez Ramiro Remigio , Zamora Abraham Adalberto Bayas , MuÃ±oz SÃ¡nchez Galo Israel , Rivas Santacruz Cristhian AdriÃ¡n
Published: August 2020

The objective of the present investigation was to evaluate the physical characteristics of the vermicompost and the quality of the purine of the red Californian (Eisenia foetida) using different substrates of feed for these worms. For this purpose, nine treatments were studied: 75% African palm rachis + 25% cattle manure, 50% African palm rachis + 50% cattle manure, 25% African palm rachis + 75% livestock manure, 50% manure of cattle, 50% of manure of cattle, 25% of manure of cattle, 50% of manure of cattle, 50% of manure of cattle, 50% of rach of coconut + 50% of manure of Livestock, 25% coccus rachis + 75% livestock manure. The substrate made up of 50% of rachis of coconut and 50% of livestock manure can be used in nurseries or nurseries for being the one that registered a value of pH 7.3 plus the closest to the neutral compared to the others, besides this (75% of oil palm rachis and 25% of cattle manure) showed a higher content of humic and fulvic acids (0.87 and 0.45 p / p, respectively), compounds that are important for agriculture by stimulating plant growth, in addition to this reflection 0.06% sulfur content, 4.0 ppm boron, 7.0 ppm copper, 47.5 ppm iron, 6.0 ppm manganese, with a presence of microorganisms of the species Trichoderma, Penicillium, Cladosporium sp. in amounts of 1.91x105 UFC / ml, however in this substrate was obtained between 13.3 and 43.5% less liquid slurry in Comparison with other treatments.
Diagnosis of the Environmental and Economic Social Sustainability of the Faita Enclosure of the Canton Quevedo-Ecuador
Authors: Escobar MorÃ¡n Edith Lorena , MenacÃ© Almea Moises Arturo , Maenza Cesar Varas , MuÃ±oz Macias Sandra Cecilia
Published: August 2020

The aim of this study was to perform the agroecological diagnosis to determine the sustainability of agricultural production system Campus Faita of Quevedo Canton province of Los Rios Ecuador applying the matrix of Battelle Columbus for the characterization of the physical, abiotic, socioeconomic environment and which also it served to extract sustainability indicators to assess production systems Campus. Faita is in the tropical dry forest area where the predominant plant cover crops are planted forests and grass where there is almost no native vegetation. The average farm area is 5 hectares, production is diversified with a pattern of prevalent crops such as cocoa, tropical fruit mostly associated, timber cultivation and short cycle crops corn and soybeans. The economy of farmers is critical, although the average income in the area is within the official indexes. There are ecological and pollution by burning action, noise problems (97%), deforestation (98%) and especially by the aerial spraying of banana close, prolonged drought in the summer. The pressure on land use is moderate, subsistence production systems account for 49%. Sustainability Assessment qualifies as sustainable when discussing environmental or production indicators, but social and economic development is not sustainable where systems generally are not sustainable as it achieves an overall average of 55, 52%.
Statistical Analysis of the Influence of Studentsâ€Ÿ Involvement in School Politics on Their Academic Performance
Authors: B. T. Babalola , O. A. Olubiyi , D. Ayemidotun , A. P. Solomon
Published: August 2020

The study investigates the effect that studentsâ€™ involvement in University politics has on their academic performance by comparing their results when they were not involved in politics with the results after involving in active politics. The data used for the study was gotten from questionnaires in a University in Nigeria. The Wilcoxon signed rank test was employed for analysis and other descriptive statistics were considered.
Effect of Academic Activities on Plasma Cortisol, Glucose Levels and Body Mass Index in Students of College of Health Sciences, Nnamdi Azikiwe Uiversity, Nnewi Campus, Anambra State, Nigeria
Authors: Adamma Analike Rosemary , Onyedika Dibor Henry , Chukwuemeka Ogbodo Emmanuel , Ifeoma Priscilla Ezeugwunne , Kalu Amah Ubuo , Nwabunwanne Oguaka Victor , Kalu Amah Akuma , Athanatius Onyegbule Onyema , Chukwuemeka Meludu Samuel
Published: August 2020

Academic activities have been described as a naturalistic stressor capable of affecting human health. This study investigated the effect of academic activities on plasma cortisol, glucose levels and body mass index in students of College of Health Sciences, Nnamdi Azikiwe University, Nnewi Campus, Anambra State, Nigeria. A total number of 60 male subjects were recruited for this study. They were grouped into 2 stages (3 and 8 weeks) of intensive academic stress respectively. Thereafter, 5mls of blood sample was collected from the subjects into fluoride oxalate and lithium heparin containers respectively and used for analysis of biochemical parameters. Serum cortisol was assayed using ELISA method, whereas plasma glucose level was assayed using enzymatic method. Anthropometric parameters of the subjects were obtained using a well-structured questionnaire. Result showed that the mean plasma glucose level in 8 weeks was significantly higher (4.64Â±0.23) compared with 3 weeks (4.06Â±0.20) of academic stress (P<0.05). Again, the mean serum cortisol level was significantly higher in 8weeks (415.00Â±16.54) compared with 3 weeks (398.00Â±10.51) of subjects exposure to academic stress (P<0.05). Meanwhile, there was a significant decrease in the mean BMI of the subjects in 8weeks of examination (23.50Â±3.25) when compared to 3 weeks (24.51Â±4.10) (P<0.05). This study also revealed a significant positive correlation between Plasma glucose and serum cortisol levels (r= 0.184; P=0.002), BMI and cortisol level (r= 0.253; P=0.004) of the participants after 3weeks of academic stress. More so, at 8 weeks of academic stress, there was a significant positive correlation between mean plasma glucose and serum cortisol levels (r= 0.240; P=0.001) and between BMI and cortisol level (r= 0.151; P=0.000). This study showed that the mean levels of serum cortisol and plasma glucose increases with increasing duration of academic activities, whereas, BMI decreases with increase in the duration of academic stress.
Kinetics and Mechanism of Oxidation of Alizarin Yellow R Dye by Chloramine-T in Hydrochloric Acid Medium. A Spectrophotmetric Study
Authors: Abdulsalam Fathyah Omar , T. Dr. Asha Iyengar
Published: August 2020

Kinetics of oxidative decolorization of alizarin yellow R (AYR) by chloramine-T (CAT) in hydrochloric acid (HCl) medium at 304 K has been investigated spectrophotometrically at Î»max520 nm. The reaction showed first-order rate dependence on [CAT] and [AYR]o and fractional order dependence on [HCl]. Stoichiometry of the reaction was found to be 1:1 with respect to the substrate and oxidant respectively. The oxidation products were identified by spectral analysis. Variation of ionic strength had no effect on the rate. Addition of p-toluene sulphonamide (PTS) did not retard the rate of the reaction. Activation parameters have been computed. Probable mechanism and the relevant rate law have been deduced for the observed kinetic results.
Studi Timbulan Dan Komposisi Sampah Di Kampus Universitas Lampung
Authors: Puspita Yuliandari  , Erdi Suroso  , Pramita Sari Anungputri
Published: August 2020

Universitas Lampung dengan luas 63,5 hektar masih memiliki permasalahan dalam penanganan sampah. Peningkatan jumlah sampah terjadi seiring dengan bertambahnya jumlah warga kampus Universitas Lampung. Angka laju timbulan dan komposisi sampah belum diketahui secara pasti. Tujuan dari penelitian ini adalah mengkaji timbulan, komposisi dan merencanakan konsep pengelolaan sampah Kampus Universitas Lampung yang terdiri dari lima aspek yang saling mempengaruhi satu sama lainnya yaitu aspek teknik operasional, peraturan, kelembagaan, biaya dan peran serta warga kampus. Pengukuran timbulan sampah menggunakan metode load count analysis dengan sampel yang berasal dari lingkungan kampus Universitas Lampung. Komposisi sampah ditentukan dan dianalisis berdasarkan SNI 19-3964-1994. Hasil penelitian berupa laju timbulan sampah di lingkungan Universitas Lampung sebesar ±770 kg/hari. Komposisi sampah paling besar didominasi oleh sampah yang dapat dikomposkan, plastik, dan kertas.
Karakterisasi Sampah di Lingkungan Universitas Lampung
Authors: Pramita Sari Anungputri  , Puspita Yuliandari  , Erdi Suroso
Published: August 2020

Persoalan sampah merupakan salah satu masalah penting yang timbul di kawasan Universitas Lampung seiring dengan meningkatnya jumlah civitas akademika di lingkungan kampus. Karakterisasi sampah sangat penting untuk dilakukan untuk mengetahui proses pengelolaan sampah yang tepat guna. Penelitian ini bertujuan untuk mengkaji karakteristik sampah di lingkungan Universitas Lampung. Sampah di lingkungan Universitas Lampung diklasifikasikan menjadi 4 kategori yaitu sampah kering, sampah basah, sampah abu dan sampah jalanan dengan parameter pengujian yaitu pengujian kadar air, densitas dan nilai kalori. Hasil penelitian menunjukkan bahwa sampah kering memiliki kadar air, densitas dan nilai kalori sebesar 4,68%; 55,81 kg/m3 dan 17,6 MJ/kg, sampah basah memiliki kadar air, densitas dan nilai kalori sebesar 87,37%; 902,80 kg/m3 dan 15,90 MJ/kg, sampah abu memiliki kadar air,  densitas dan nilai kalori sebesar 4,71%; 81,20 kg/m3 dan 2,89 MJ/kg serta sampel yang terakhir yaitu sampah jalanan memiliki kadar air, densitas dan nilai kalori sebesar 11,11%; 352,25 kg/m3 dan 12,81 MJ/kg.
Efektivitas Larutan Mikroorganisme Lokal dari Tandan Kosong Kelapa Sawit Secara Aerob
Authors: Anis Puji Andayani  , Dermiyati  , Radix Suharjo  , Ivayani  , Mareli Telaumbanua
Published: August 2020

Luas perkebunan kelapa sawit di Provinsi Lampung termasuk dalam peringkat ke-13 di Indonesia.  Tandan kosong kelapa sawit (TKKS) merupakan limbah organik dari tandan buah segar.  Jumlah TKKS yang dihasilkan sangat melimpah namun belum dimanfaatkan secara optimal.  Penelitian ini bertujuan untuk mengetahui efektivitas larutan mikroorganisme lokal (MOL) dari TKKS secara aerob khususnya untuk mempelajari populasi dan karakteristik bakteri yang terdapat di dalam MOL TKKS.  Pengamatan dilakukan dengan menghitung jumlah populasi dan dibedakan berdasarkan bentuk dan warnanya.  Selain itu dilakukan juga uji karakteristik lainnya berupa uji gram, uji oksidatif fermentatif (O/F), uji soft rot, uji hipovirulen, dan uji hipersensitif.  Hasil penelitian menunjukkan bahwa terdapat 84 isolat bakteri yang berhasil diisolasi dan diuji karakteristiknya.  Larutan MOL TKKS secara aerob, jumlah populasi yang didapatkan pada setiap waktu pengambilan sampel berbeda.  Jumlah isolat terbanyak 197,96 x 1012 pada 18 hari setelah pembuatan larutan MOL (HSP) dan terendah 0,02 x 1012 pada 15 HSP.  Bentuk koloni yang didapatkan bulat dan tidak beraturan dengan warna putih, putih keruh, merah, kuning, orange, putih kekuningan, kuning pekat, hingga bening.  Sebagian besar bakteri 71,43% bersifat gram positif, 90,48% bersifat fermentatif, 75% bersifat negatif softrot, 78,57% bersifat virulen, dan 94,05% bersifat negatif pada uji hipersensitif.
Development of learning tools project based learning to increasing the basic skills of catering students at SMK 6 Makassar
Authors: Qur’ani Besse
Published: August 2020

This study aims to develop learning tools based on project based learning in improving the basic skills of catering for students of SMKN 6 in Makassar. This type of research is the development of learning tools in the form of research and development. The tools developed include the syllabus, job sheets and student books. The development model used is a 4-D model with stages of define, design, develop and disseminate. Based on the results of the analysis conducted, the development of learning tools with the PjBL model is declared valid, practical and effective so that it is feasible to use, so it is necessary to consider criteria that include; (1) the results of the validity of PjBL-based learning tools after being evaluated and examined by experts produce valid categories for lesson plans and job sheets, while for student books in the category are very valid (very good); (2) student activities receive classical completeness in the category of very valid (very good), while for cognitive, affective and psychomotor learning outcomes students are in the valid category; and (3) student responses and management of learning in the classroom categories are very valid. The suggestions made in this study are (1) to fellow teachers to use the PjBL model as an alternative used in the learning process; (2) learning materials developed after improvements and revisions can be tested in several other schools based on the problem characteristics of each school.
Reflexões sobre a construção da identidade profissional de uma docente da educação infantil
Authors: Silva Jéssica Francine Ferreira da , Souza Ana Paula Gestoso de , Braga Andréia Barboza
Published: August 2020

Este trabalho, de natureza qualitativa, foi realizado por meio da análise de um memorial de formação. Investigamos a trajetória de formação de uma professora da Educação Infantil, participante de um projeto de extensão. Buscamos analisar e compreender as experiências relatadas em seu memorial de formação e, desse modo, procuramos identificar e observar indícios da construção de sua identidade profissional. O memorial revelou que as experiências que a professora teve, fez e pensou sobre foram altamente significantes para a sua formação profissional e para a construção de sua identidade docente. Nas revelações de indícios que permeiam a construção de sua identidade profissional observamos que dois contextos se destacam: formação docente e prática.
The Cruciality of Using Literature to Enhance Reading Comprehension Skills
Authors: Hassan Ali Eltayb Dr. Khaled
Published: August 2020

This paper attempted to shade the light upon “The cruciality of teaching Literature to enhance reading comprehension skills”, is conducted to find out the role and importance of teaching literature in developing comprehension skills in tertiary level. The researcher adopted descriptive analysis method, the population of this study of (30) English language teachers from different Sudanese universities. Date was gathered by questionnaire. The researcher used a statistical package for social studies (SPSS package). The study comes up with followings: Teaching literature in language courses helps students to develop Reading Comprehension skills, teaching literature in reading lessons helps students to develop skimming and scanning techniques, literature presents valuable material to teach reading comprehension lesson, literature is a good way to practice acquiring quick information from the texts, and teaching literature develops students’ interpretative abilities.
Innovación e improvisación en el marco de la pandemia de COVID-19: relato de una experiencia
Authors: Del Río Laura Sombra , Knopoff Patricia , Boero Eugenia , Ciliberti Leonardo
Published: August 2020

En el presente trabajo se relata la experiencia de nuestro equipo docente en el marco de la contingencia provocada por la pandemia de COVID-19. Nuestra universidad decidió en este particular contexto ratificar su calendario académico y garantizar la continuidad pedagógica a través de la modalidad de enseñanza a distancia. Este requerimiento nos puso a los docentes de la casa a pensar y a actuar con gran celeridad, seleccionando las herramientas y metodologías que consideramos más adecuadas para garantizar el derecho a continuar estudiando a la mayoría de nuestros estudiantes. En este trabajo, queremos presentar las estrategias didácticas llevadas a cabo por nuestro equipo docente -el cual está a cargo de una comisión de la cátedra Matemática A, de la Facultad de Ingeniería de la Universidad Nacional de La Plata-, algunas de las dificultades que nos hemos encontrado en este camino y algunos resultados que nos permiten valorar positivamente la experiencia.

PALABRAS CLAVE:  Educación virtual de emergencia, COVID-19, Enseñanza de la Matemática, TIC y Educación
Una experiencia de educación en emergencia sanitaria: de la presencialidad al entorno virtual
Authors: Peralta Minini Verónica , Musatto Carolina Alejandra
Published: August 2020

A través del desarrollo de la siguiente experiencia como docentes, buscamos realizar una descripción y visibilizar aspectos para análisis sobre la modificación y complejidad de los procesos de enseñanza-aprendizaje en el contexto de emergencia sanitaria por Covid-19, que actualmente atraviesa a Argentina y a otros países del mundo.

Frente a este momento tan complejo, el distanciamiento social obligatorio, pone en cuestión las estrategias de enseñanza-aprendizaje tal y como han sido planteadas desde la creación de la educación formal, donde los/as estudiantes, concurren a un espacio físico (el establecimiento educativo) para poder adquirir y construir conocimientos. Es así que desde el corriente año, las normativas impuestas por la emergencia, han implicado que los/as docentes adecuemos los espacios curriculares en los que nos desempeñamos, a las nuevas tecnologías, debiendo repensar no sólo las estrategias a implementar, si no la dificultad de acceso de algunos sujetos a los espacios virtuales. 

En este sentido, las condiciones socio-económicas presentes, demuestran que no todos los/as estudiantes poseen el acceso a servicios o tecnología que permita un proceso sostenido en el tiempo de educación virtual.

A su vez, identificamos la necesidad por parte de las instituciones educativas, de implementar mayores recursos institucionales para poder abordar dicha complejidad, fomentando mayor acompañamiento a la diversidad de situaciones que poseen los/as estudiantes.

Es a través de esta narración de nuestra experiencia, que desarrollamos el proceso de transformación, de una estructura presencial a una virtual, abarcando distintos medios y plataformas, y además pensando futuras estrategias, tendientes a promover la permanencia y el avance académico.

PALABRAS CLAVE: entorno – virtual – estudiantes – emergencia.
Posibilidades y limitaciones del Trayecto de la Práctica en tiempos de Pandemia. El caso del Profesorado en Matemática de la UNR
Authors: Sgreccia Natalia , Cirelli Mariela
Published: August 2020

Este trabajo se ubica en el desarrollo del trayecto de la práctica docente en el contexto de pandemia del año 2020, tomando como caso el Profesorado en Matemática de la Universidad Nacional de Rosario. Esta Universidad, así como otras en el territorio nacional, ha optado por aproximarse a una pedagogía de la virtualización durante el período de aislamiento. Para la carrera en cuestión, el trayecto de la práctica docente se constituye en su proyecto articulador, en tanto se desarrolla intencional e integralmente del primer al cuarto y último año del plan de estudios. En este marco, el presente trabajo retoma testimonios de docentes de los espacios curriculares respectivos. Puntualmente las profesoras comparten pareceres y experiencias relativos tanto a las similitudes como a las diferencias con respecto al aula presencial en términos sociales, tecnológicos, institucionales y de contenido. También mencionan dificultades que están teniendo en este contexto y señalan, a su vez, aspectos que podrían estar potenciándose en comparación con lo que suele suceder en el aula presencial. Finalmente identifican limitaciones propias de la virtualidad para el desarrollo del trayecto de interés, sin dejar de apuntar posibilidades que en estas circunstancias están emergiendo. Estas reflexiones situadas permiten robustecer el conocimiento acerca de las adaptaciones de los dispositivos de formación para ser profesor/a en Matemática que se emplean en la carrera. Una comprensión del asunto desde la investigación educativa posibilita no solo responder a la coyuntura actual, sino seguir mejorando los mecanismos para contribuir a la sociedad con profesionales idóneos/as, con herramientas para descifrar las necesidades de su tiempo, en clave de compromiso social universitario.

PALABRAS CLAVE: Profesorado en Matemática, Práctica Profesional Docente, Virtualización, Pandemia.
¿Todo lo sólido se desvanece en cuarentena?
Authors: Garriga María Cristina , Pappier Viviana , Cuesta Virgina , Linare Cecilia , Rocha Milagros
Published: August 2020

Las certezas, o por lo menos algunas desde donde partimos para pensar el espacio del aula, se encuentran en modo “recalculando”. La incertidumbre nos invade, nos desconcierta y al mismo tiempo nos invita a repensar nuestras prácticas, a producir conocimientos desde otros formatos pero siempre desde una convicción compartida: el trabajo en equipo, en el que cada una de nosotras aporta desde una mirada, una trayectoria en la cátedra que se complementa a partir del diálogo y la confianza, el compartir dudas y esperanzas. Todo un ejercicio de creatividad al interior del equipo y con y para con los y las estudiantes.

Las categorías de tiempo y espacio implosionaron, tomando otras dimensiones en el campo educativo. La corporalidad también entró y entra en otras dimensiones, como docentes, las jornadas laborales se volvieron más extensas, más exigidas. La vida cotidiana se alteró completamente, los tiempos laborales se vuelven difusos.

Los cuerpos, fraccionados en ventanas de una pantalla, fueron y son el soporte posible para generar encuentros y construir sentidos.

En este trabajo queremos compartir los debates al interior del equipo docente y con nuestros/as estudiantes en torno a la posibilidad misma de la práctica en las escuelas secundarias y al recorrido que podemos hacer desde la pantalla hasta tanto se “normalicen” las clases en la Universidad.

Las fuentes utilizadas son las biografías escolares de los/as estudiantes y los registros de tres actividades virtuales vía jitsi en las que nos “encontramos” con ellos y ellas y con docentes del nivel secundario que se desempeñan en diferentes escuelas de la Ciudad de La Plata y Gran La Plata.

Esos encuentros virtuales promovieron preguntas y debates que posibilitaron pensar el contexto desde voces que enuncian diversas experiencias.

Producir documentación pedagógica de este tiempo tan particular es uno de los objetivos que nos guía, objetivo no ajeno a la reflexión sobre la práctica en una mirada diacrónica con las experiencias propias y las de los estudiantes.

El concepto que nos permite articular las categorías de tiempo, espacio y sujetos, es el de cultura escolar, definido por Dominique Julia (2001) que refiere tanto a las normas como a las prácticas coordinadas a finalidades que varían según las épocas en un cronosistema que habilita hablar de cultura(s) escolar(es) en plural. 

Es por demás evidente que este trabajo se produce al calor de una situación inédita y en ese sentido en él se traducen nuestras reflexiones en voz alta.

PALABRAS CLAVE: tiempo, formación docente, pandemia, vida cotidiana
Factors associated with job satisfaction and engagement among credentialed small animal veterinary technicians in the United States
Authors: Liss David J. , Kerl Marie E. , Tsai Chia-Lin
Published: August 2020

OBJECTIVE

To investigate job satisfaction and engagement among credentialed veterinary technicians (CVTs) employed in the United States.

SAMPLE

873 CVTs who responded to an internet-based survey in 2017.

PROCEDURES

A survey was conducted to collect information on demographics, individual engagement, and job satisfaction among a convenience sample of CVTs in the United States. Only responses from those employed in small animal practice were included. Demographic and job-related factors were evaluated for associations with individual engagement and job satisfaction.

RESULTS

The mean (SD) score for overall individual engagement (7-point Likert scale, with 7 representing strong engagement) was 4.9 (1.0) and for job satisfaction (7 representing extreme satisfaction) was 5.4 (1.5). Factors associated with lower individual engagement and lower job satisfaction included most frequently working overnight shifts and having more veterinarians in the respondent's practice, whereas holding a supervisory role, receiving a higher hourly wage, and having more veterinary technicians in the practice were significantly associated with higher individual engagement and higher job satisfaction, with other variables held constant. Having a veterinary technician specialist designation was not associated with individual engagement or job satisfaction.

CONCLUSIONS AND CLINICAL RELEVANCE

To the authors’ knowledge, this was the first study to investigate factors associated with individual engagement and job satisfaction among CVTs in the United States. Employers should review these factors and support and enhance those associated with enhanced engagement and increased job satisfaction. Employers should regularly review factors identified as negatively associated with job satisfaction and engagement and do their best to mitigate them.
Pre-Incubation and Turning During Long Storage as a Method of Improving Hatchability and Chick Quality of Japanese Quail Eggs
Authors: Damaziak Krzysztof , Pyzel Bożena , Zdanowska-Sąsiadek Żaneta
Published: August 2020

In this study, we investigated the effect of modification of 12 d storage conditions of quail eggs from two flocks: at 17–20 weeks of life (A) and 36–39 weeks of life (B) on the incubation time, hatch window (HW), hatching results and chicks quality. The eggs were divided into experimental groups: COI = no pre-incubation (PI); SPIDES = were treated with 4 h PI, delivered at 4, 6, 8 and 10 d of storage; EG SPIDES = were treated with variable time of PI according to the scheme 5 d – 2 h, 7 d – 3 h, 9 d – 5 h and 11 d – 6 h. In addition, in each group, half of the eggs were turned (T) every 12 h, which is indicated as COI T, SPIDES T and EG SPIDES T. Pre-incubation was conducted at 37.8°C and 50–55% RH. It has been demonstrated that both storage profiles contribute to shortened incubation time, yet the HW is deteriorated if T is not applied. The benefits resulting from the EG SPIDES profile is an increase of 2.3 points in the “average score of all chicks” index compared to the COI group. In summary, the use of PI and T, and in particular the EG SPIDES profile with the concomitant use of T during long storage of quail eggs is recommended to obtain a considerable improvement of hatching results and chick quality.
Evaluation of the meat traits of lambs of Polish native breeds
Authors: Janiszewski Piotr , Grześkowiak Eugenia , Lisiak Dariusz , Borys Bronisław , Borzuta Karol , Lisiak Beata
Published: August 2020

The research was performed on 136 male lambs, at an average slaughter weight of 32 to 42 kg, of the following Polish native breeds: Uhruska (UHR), Pomeranian (Pomorska, POM), Blackheaded (Czarnogłówka, CZGŁ), Podhale Zackel (Cakiel Podhalański, CKP), Wrzosówka (WRZOS), Świniarka (SWIN), Wielkopolska (WLP) and Polish Merino old type (MST). The longissimus lumborum muscle was tested to establish its basic chemical composition, physical and chemical traits as well as sensory traits. The meat quality of tested breeds was high, especially in terms of sensory traits. However, high variability of studied traits was observed depending on the breed, e.g. the average pH24 ranged between 5.58 (WLP) and 5.77 (WRZOS), intramuscular fat content ranged between 1.98% (CZGŁ) and 4.12% (WLP), meat tenderness varied from 4.2 points (POM) to 4.64 points (UHR). Somewhat dark meat colour was observed in all breeds which is worth noticing (L* from 34.86 to 38.50). According to the general estimation of tested quality traits the following breeds were on the top of the ranking: SWIN, UHR, WLP and WRZOS. Further down in the ranking the following breeds were placed: POM, MST and CKP.
Identification of mRNA Degradome Variation Dependent on Divergent Muscle Mass in Different Pig Breeds
Authors: Piórkowska Katarzyna L. , Szmatoła Tomasz , Pawlina-Tyszko Klaudia , Gurgul Artur , Żak Grzegorz , Ropka-Molik Katarzyna M.
Published: August 2020

The search is still on for the molecular processes associated with the development and metabolism of skeletal muscles. Selection conducted in farm animals is focused on high muscle mass because it delivers higher economic profit. The present study aimed to shed light on mRNA degradome signals that could be characteristic for molecular processes associated with an abundance of muscle mass and to identify miRNA regulatory networks controlling these processes in pigs applying next-generation-sequencing (NGS). In the study, over 10,000 degraded transcripts were identified per sample, with the highest abundance for genes encoding mitochondrial proteins (COXs, NDs, CYTB, ATP6 and ATP8). Moreover, only 26% of the miRNA targets were found within this degraded transcript pool, which suggested for miRNAs other molecular mechanism at different level of gene expression than mRNA degradation. On the other hand, a small share of the identified degraded transcripts associated with miRNA regulation suggests a different mechanism of mRNA degradation for identified degraded transcropts. Subsequently, most of the miRNA gene degraded targets, such as ENO3, CKM, CRYAB and ADAM19 encode proteins involved in the muscle mass control. The present study showed an interesting dependence between miRNAs and their targets. Nevertheless, the complete view of the miRNA regulatory network could be a subject of further advanced research, which would employ a miRNA transfection procedure in skeletal muscle cell cultures.
Effects of dietary supplementation of iron as sulphates or glycine chelates on the productive performance and concentrations of acute-phase proteins and iron in the serum and liver tissues of broiler chickens
Authors: Jarosz Łukasz , Marek Agnieszka , Grądzki Zbigniew , Kwiecień Małgorzata
Published: August 2020

The aim of the study was to determine the effects of inorganic (ferrous sulfate [FeSO4] and FeSO4 + phytase [FeSO4+F]) and organic forms of iron (ferrous glycine chelate [FeGly], Fe-Gly + phytase [Fe-Gly+F]) on the concentrations of C-reactive protein (CRP), serum amyloid A (SA), alpha- 1-acid glycoprotein (α-AGP), haptoglobin (Hp), transferrin (TRF) and iron in the blood and liver tissue of poultry. Ross 308 roosters were used in this study. The acute-phase protein (AP) levels in the chicken serum and liver tissues were assayed using the double-antibody sandwich ELISA kits for chickens. The iron levels in serum and liver samples were measured using flame atomic absorption spectrophotometry. The results showed that the serum and hepatic iron concentration in the chickens receiving Fe-Gly and Fe-Gly-F were significantly higher than those in the control group and in the chickens receiving iron in the form of sulphates. Further, serum CRP and SA concentrations were lower in the chickens from the supplemented groups than in those from the control. The hepatic CRP concentration was higher in the supplemented groups than in the control group. The serum and hepatic TRF concentration were highest in the chickens receiving FeSO4 and FeSO4-F. The hepatic Hp concentration was higher in the chickens receiving organic forms of iron than in the control chickens, whereas the serum Hp concentrations were similar across the groups. The highest α-1-AGP concentration was found in the livers of the chickens receiving Fe- Gly and Fe-Gly-F. Taken together, these findings suggest that iron had the most beneficial effects for poultry in terms of health, performance and immunity when added to the feed in the form of glycine chelate.
The Demographic Problem - one of the Main Problems of Contemporary
Authors: Vladev Ivaylo , Vladeva Rositsa
Published: August 2020

The present study attempts to analyze the essential characteristics of the global problems in the development of human society at the present stage and to highlight the place of the demographic problem as an objective factor for the existence of modern civilization. It clarifies the criteria for determining a problem as a global one and makes classification from a geographic point of view. It identifies the causes for the demographic problem, analyses and specifies its different dimensions at the global, regional and national levels.
Rare case of unerupted second deciduous molar with congenitally missing second permanent premolar: Case report
Authors: Kana Anna , Lommerse Tanya , Birnie Andrew
Published: August 2020

Background/Aim: The purpose of this report is to present an unusual case of failure of eruption of a second deciduous molar and its management. Case Report: An 8-year-old boy presented with a complaint of a missing tooth. Radiographic examination revealed the second deciduous molar was impacted without any mechanical obstacles, like an odontoma or supernumerary teeth, being present. Conclusions: The case presented in this report is of scientific relevance due to the rarity of this type of pathology and the interesting histopathology.
Generalization of uniqueness and value sharing of meromorphic functions concerning differential polynomials
Authors: Waghamore Harina P. , Maligi Ramya
Published: August 2020

The motivation of this paper is to study the uniqueness problems of meromorphic functions concerning differential polynomials that share a small function. The results of the paper improve and generalize the recent results due to Fengrong Zhang and Linlin Wu [13]. We also solve an open problem as posed in the last section of [13].
A note on the volume of ∇-Einstein manifolds with skew-torsion
Authors: Chrysikos Ioannis
Published: August 2020

We study the volume of compact Riemannian manifolds which are Einstein with respect to a metric connection with (parallel) skew-torsion. We provide a result for the sign of the first variation of the volume in terms of the corresponding scalar curvature. This generalizes a result of M. Ville [15] related with the first variation of the volume on a compact Einstein manifold.
Effects of constantly high soil water content on vegetative growth and grape quality in Japan with high rainfall during grapevine growing season
Authors: Kobayashi Yuta , Yamamoto Tetsunan , Ikeda Hironori , Sugihara Ryuzo , Kaihori Hiroki , Kawabata Masahiro , Suzuki Shunji
Published: August 2020

Excess water in vineyard soils during grapevine growing season is expected to become a critical issue in Japan. The objective of this study was to investigate the effects of constantly high soil water content which was controlled at constantly more than 20% water content in soil on vegetative growth and berry quality of Cabernet Sauvignon over a 3-year growing season. A wireless sensor networking system for real-time monitoring of soil moisture was used to check that the experimental plot had constantly more than 20% water content in soil. Véraison in the experimental plot controlled at constantly high soil water content started 10 days, 4 days and 1 day later than that in the non-irrigated experimental plot in the 2017, 2018 and 2019 growing seasons, respectively. The constantly high soil water content had no notable effects on berry quality, such as berry characteristics and berry composition, at harvest compared with the non-irrigated experimental plot, although there was a certain tendency that constantly high soil water content decreased anthocyanin contents in berry skins compared with those of non-irrigated grapevines during the three growing seasons. We postulated that waterlogging damage due to the increase in soil water content by frequent rainfall would be minimised by the selection of rootstock that confers tolerance to waterlogging stress for scion cultivars and/or viticultural practices to prevent decrease in soil temperature. Also, the introduction of Internet of Things technology for monitoring water status in vineyard soil is expected to contribute to improving practical approaches to vineyard soil water management.
Life Satisfaction and Migration - What Relationship?
Authors: Ciorbagiu Ioana , Stoica Adrian , Mihaila Monica
Published: August 2020

The aim of the paper is to empirically assess if immigrations is a potential predictor of life satisfaction in European countries, considering also other socio-economic determinants. For this purpose, we are using data from the European Quality of Life Survey 2016 implemented by Eurofound. Our results show that immigration, measured here by migrants born in another country, has a net positive impact on subjective well-being, and strictly in this context, migration does not prove to be a threat on well-being. Also, the results suggest that immigration leads to well-being in different ways, more precisely it seems to support a better quality of life for the more privileged and not so much for the less privileged. The statistical and econometrical evaluation of the conection between life satisfaction and other determinants, grouped in categories such as demographical, socio-professional, economical highlights a series of general and specific influences. Subjective well-being, representing eudaimonic well-being, is positively associated with an improvement in the areas of life satisfaction, especially with the standard of living and family life. We also identified positive influence on life satisfaction, in relation to aspects such as the freedom to decide how to live, the efforts made to have a better life or individuals’ own optimism. A very important aspect is a good health, a reduced risk of psychological depression and chronic physical and mental problems.
Spectral Analysis of Output Voltages and Currents as a Criterion for Technical Diagnostics of Synchronous Generators of Ship Diesel Engine
Authors: Gasparjans A. , Terebkov A. , Priednieks V. , Klaucans R.
Published: August 2020

Diesel generator sets (DGU) are very widely used in autonomous power supply systems. An example is marine power plants, diesel locomotives with electric power transmission, uninterruptible power supply units, etc. The power of ship DGUs reaches 2–6 or more MW in one unit. The number of units on ships can be different, but, as a rule, at least two. In this paper, we propose a method of monitoring the dynamic electromechanical system “diesel synchronous generator”. The method aims at using a synchronous generator machine as a multifunctional accurate and sensitive sensor for diagnostic parameters of the electromechanical system. The proposed method of technical diagnostics is based on continuous monitoring of non-uniformity of diesel torque, fluctuations in the instantaneous angular velocity and instantaneous angular acceleration of the diesel crankshaft. These data are the results of a spectral analysis of stator currents and voltages of a synchronous generator.
Implementation of Multi-Wavelength Source for DWDM-PON Fiber Optical Transmission Systems
Authors: Vilcane K. , Matsenko S. , Parfjonovs M. , Murnieks R. , Aleksejeva M. , Spolitis S.
Published: August 2020

Four-wave mixing (FWM) is one of the well-known nonlinear optical effects (NOE), and it is considered as an adverse impact in fibre optical communication lines. This nonlinear optical effect as a productive one can be used in fibre optical communication systems for various optical processing functions, like wavelength conversion, high-speed time-division multiplexing (TDM), pulse compression, fibre optical parametric amplifiers (FOPA), etc. In most of the fibre optical communication systems, each data transmission channel requires one light source (e.g., laser) as a carrier, which can make these transmission systems expensive. For example, to provide operation of 4-channel dense wavelength-division-multiplexed (DWDM) system four separate lasers at specific operation wavelengths are needed. On the contrary, through the FWM effect, which can be obtained in highly nonlinear optical fibre (HNLF) by using two high-power pump lasers, the generation of new multiple carriers forming the laser array or a multi-wavelength source is possible. Accordingly, within the present research, we investigate the latter approach for FWM light source implementation in DWDM passive optical networks (DWDM-PONs). We analyse up to 16-channel 50 GHz spaced DWDM-PON system with a bitrate of up to 10 Gbit/s per channel, constructed on the basis of two high-power continuous wave (CW) pump lasers. We evaluate the system performance against the number of its channels by changing it from 4 to 16 and in each case find the most optimal HNLF fibre length (for a 4-channel system it is 0.9 km; for an 8-channel system – 1.39 km; and for a 16-channel system – 1.05 km) and laser pump powers (for a 4-channel system it is 20 dBm; for an 8-channel system – 24.1 dBm; and for a 16-channel system – 26.3 dBm). These optimal parameters were found in order to get the highest system performance, respectively, the lowest BER (threshold BER≤10−10), and minimal power fluctuations among FWM generated carriers. The obtained results show that the proposed transmission system can be a promising solution for next-generation high-speed PONs.
Geo Electric Study in Hydrogeology According to the Axis Hassi Naga – Hassi Khebi of Tindouf (Southwestern Algeria)
Authors: Zeroual I. , Hami K. , Talhi A. , Touhami A.
Published: August 2020

The hydrogeological environment of the Saharan North East region of Tindouf is of utmost interest, particularly in agriculture. In fact, exploitation and exploration processes must be analysed to ensure sufficient water production. This study demonstrates the value of spatial processing and exploitation of geoelectric and geological data in the study area and facilitates interpretation. The results of the electrical survey and the spatial analysis of the data allowed us to design a complete model that met the needs of hydrogeology. The applied methodology consists in breaking down our subject into three (3) classes of entities: geomatics, geophysics and hydrogeology. Synthetic mapping based on continuity is the result of studying two sites (Hassi Naga and Hassi Khebi) for geological analysis. Knowing that the electrical resistivity is between 0 and 3000 Ohm-meter, we were able to construct thematic maps showing the spatial distribution of the facies and the probable positions of the boreholes. The study provided with a geo-spatial model highlighting the impact of measurements in hydrogeology of the area considered that was called SIHE (Information System for Environmental Hydrogeology).
Macropolization in the People’s Republic of China, 1950–2015
Authors: Szymańska Daniela , Wylon Mirosław
Published: August 2020

This article concerns the process of population concentration in large urban centres in China. The authors conclude that this process is reflected in the increase in the number of cities of a million or more, and the increase in their share of China’s total population, as well as in the country’s total urban population; the process is here termed ‘macropolization’. We analyse and assess the process of macropolization and examine changes in the size structures of these cities (one million or more), and the accompanying transformation in the spatial differentiation of urban population concentrations in China. In addition, the effect that macropolization has on the level of urbanization of individual provinces is shown, as is its significance in the overall share of urban population. The macropolization process from 1950 to 2015 has been assessed. The data was collected from Chinese statistical offices, United Nations reports and the available literature on the subject.
Experimental Validation of a Novel Thin-Walled Beam Prototype
Authors: Silva Hugo Miguel , Meireles José Filipe , Wojewoda Jerzy
Published: August 2020

In this paper, an experimental validation of a novel beam prototype is performed. Tensile tests, both until rupture and on the elastic domain were done in order to determine the material properties. They were used then in Finite Element Analysis model built in ANSYS Mechanical APDL. Three experimental tests were done to the prototype, and, in order to minimize errors, the average value of the three tests determined, and compared with results obtained from the numerical model. It was shown that it was possible to manufacture the beam by the presented manufacturing methodology. An acceptable correlation between the numerical an experimental results was found.
Design of Accurate Steering Gear Mechanism
Authors: Chitti Babu V. , Govinda Rao P. , Santa Rao K. , Murali Krishna B.
Published: August 2020

This article focuses on the synthesis of a steering mechanism that exactly meets the requirements of steering geometry. It starts from reviewing the four-bar linkage, then discusses the number of points that a common four-bar linkage could precisely trace at most. After pointing out the limits of a four-bar steering mechanism, this article investigates the turning geometry for steering wheels and proposes a steering mechanism using servo motors and ARDUINO board. The pitch curves, addendum curves, dedendum curves, tooth pro les and transition curves of the noncircular gears are formulated and designed. Finally, kinematic simulations are executed to demonstrate the target of design
Optimization of Machining Variables in Electric Discharge Machining Using Stainless Steel 317 in Full Factorial Method
Authors: Nandhakumar S. , Sathish Kumar S. , Sakthivelu K.
Published: August 2020

Electric Discharge Machining (EDM) is a non-conventional machining process and has a larger extent of application in manufacturing industry due to its accuracy. EDM simply uses electrical spark between the tool and workpiece in presence of dielectric medium to erode the workpiece in controlled manner. Improving the material removal rate and decreasing the tool wear rate (TWR), achieving higher surface finish, reducing machining time and enhancing dimensional accuracy are the major areas of focus in electrical discharge machining (EDM) process of SS 317 grade steel. In this research work effort to reduce the tool wear rate is concentrated by comparing the machining performance of two distinct electrodes namely copper and brass. Each electrode has their unique machining capabilities and the experimental results were compared in-terms of tool wear rate (TWR), Metal Removal Rate (MRR) and Machining Time (TM). Input variables were optimized based on the experimental output responses to achieve optimal level of input variables.
Fracture Toughness Analysis of Delamineted Composites under Variable Temperatures
Authors: El Moufari Meryem , El Bakkali Larbi
Published: August 2020

The main goal of the present paper is to approach the modeling of one of the most important and critical failure modes for composite laminates which is known as interlaminar delamination in the aeronautical structures. The analytical model is based on a fracture mechanics approach; it’s used to estimate the total mixed mode energy release rate for composite laminates. A finite element simulation has been achieved in combination with the virtual crack closure technique (VCCT) to analyze the effect of temperature on the interlaminar fracture toughness growth of a delaminated carbon/epoxy material, namely IM7/8552 subjected to mechanical loading at variable temperatures. The developed model may serve as the basis for treating different types of thermal and mechanical loading, different stacking sequences and thickness of lamina in order to build safe working conditions for composite laminates.
Elastic Waves in Spatially Periodic Anisotropic Media: Diffraction by Periodic Arrays of Voids or Anisotropic Inclusions
Authors: Ilyashenko Ałła V. , Kuznetsov Sergey V.
Published: August 2020

A two-scale asymptotic analysis coupled with the spatially periodic fundamental solutions are used for analyzing diffraction of elastic bulk waves propagating in anisotropic media containing periodic inclusions or voids. Explicit equations are derived for the scattering cross sections and velocities of bulk waves propagating in spatially periodic media with arbitrary elastic anisotropy.