bluuebunny/crossref_metadata_2025 huggingface dataset:
The Influence of Adversity Quotient, Need for Achievement, and Entrepreneurial Attitude on Entrepreneurial Intentionns
Authors: Maharani Dina Fitriya , Indrawati Aniek , Saraswati Thusy Tiara
Published: May 2020

This study aims to determine the effect of adversity quotient and need for achievement on entrepreneurial intention through entrepreneurial attitude. This study uses a quantitative approach. The population in this study amounted to 155 people with a sample of 112 people. Sampling uses probability sampling with proportional random sampling. Data collection was carried out by using a questionnaire and documentation. To analyze the data, the researcher used descriptive statistical analysis, classic assumption test, path analysis and hypothesis testing using t test and multiple tests. The analysis shows that: (1) adversity quotient influences entrepreneurial attitude, (2) need for achievement influences entrepreneurial attitude, (3) adversity quotient influences entrepreneurial intention, (4) need for achievement influences entrepreneurial intention. (5) Entrepreneurial attitude influences entrepreneurial intention, (6) entrepreneurial attitude is able to mediate the effect of adversity quotient on entrepreneurial intention, (7) entrepreneurial attitude is able to mediate the influence of need for achievement on entrepreneurial intention.
VARIABILITY OF SOME MECHANICAL PROPERTIES OF SAN RAMON TALL VARIETY OF COCONUT
Authors: R. N. Palomar
Published: May 2020

The natural variation of some strength properties of about 80‑year old brown‑and green‑pigmented San Ramon variety of coconut was investigated. The properties were determined from tests on small clear specimens in the air dry condition with an average moisture content of 16.98%. The mechanical properties studied include modulus of rupture, stress at elastic limit and modulus of elasticity in static bending, maximum crushing strength in compression parallel to grain, stress at elastic limit and in compression perpendicular to grain, and shear parallel to grain.

 

The brown‑pigmented trees showed significantly higher values in all the mechanical properties than the green‑pigmented palms.

 

For the brown‑and green‑pigmented trees, the values of strength properties markedly decreased with increasing height levels and significantly increased radially from the core to the periphery of the stem.
A REVIEW OF FERTILISER TRIALS IN TUVALU AND KIRIBATI
Authors: K. TREWREN
Published: May 2020

A brief introduction is given to a programme of 34 fertiliser trials (possibly the largest programme of fertiliser trials in the world) that have been carried out in Tuvalu and Kiribati. Some of the more striking results that have emerged have been presented, and it is hoped that readers who would find more detailed information for use to them will ask for the relevant reports from the Department of Agriculture of the two countries concerned.

 

The majority of            the trials were conducted within the 1978 and 1993 period, being started by Trewren, and the longer running trials in Kiribati were continued by Edwards and, in most cases to their conclusion, by Barr.

 

The results obtained have made it possible to formulate with some confidence recommendations on the manuring of coconuts on atolls, from seedlings in the nursery to mature palms in the field, including the rehabilitation of palms suffering from very severe deficiencies of trace elements and potassium. From foliar analysis, much useful information has been obtained on the inter‑relationships between nutrients, and in particular, on the fundamental importance of iron and other trace elements on the assimilation of macro‑nutrients and on the need to maintain a correct balance amongst trace elements.

 

Further research is needed to identify a suitable source of nitrogen. Less important topics for research could be investigations into the optimum quantity of potassium chloride application to nursery seedlings and the optimum frequency of application of potassium chloride in the field.
THE ECONOMIC IMPACT OF NPKMg FERTILIZERS ON SMALL HOLDER COCONUTS (A Case Study in Indonesia)
Authors: S. Asnawi  , S.N. Darwis
Published: May 2020

Before 1939, Indonesia was the largest copra exporter in the world (FAO 1983). But since then until 1970 it was only the se­cond largest copra exporter after the Philippines (Heesch & Kuhl­mann 1982). Between 1970 and 1980 the exports of copra from Indonesia declined drastically from 184,000 tons in 1970 to only 36,000 tons in 1980, on average a decrease of about 37.6 per cent per annum for the period (Asnawi & Darwis 1984). Since 1983 Indonesia has had to stop exports of copra due to a deficit in na­tional coconut production relative to domestic needs. For example, in 1983 the total production of coconut in Indonesia was only about 2.4 million tons copra equivalent while the total consump­tion of coconut in the country in that year was about 2.48 million tons. Thus, there was a deficit in coconut production of about 80,000 tons copra equivalent in the country in that year (Asna­wi & Darwis 1984).
COCONUT STEM UTILIZATION IN INDONESIA
Authors: Hastjarjo Sumardjan
Published: May 2020

Coconut stem has been utilized in every coconut producing country in some form or other. Its utiliza­tion varies widely from small bridges to houses, furnitures and works of art. In Indonesia it is used mainly in Java, the most densely populated island. In other islands it is rarely used except for foot bridges because of two reasons. First, the farmers are reluctant to fell their coconut trees for its yield, however, small it is. Second, there is still enough supply of forest wood.
COCONUT STEM UTILIZATION IN SRI LANKA
Authors: Ranjith Mahindapala
Published: May 2020

In the plantation agriculture in Sri Lanka, coconut occupies the highest area of nearly 420,000 ha. It is distributed in all 24 districts. The estate sector (8 ha or more) comprises 104,000 ha (24.7%) of the area while the balance, 316,000 ha (75.3%) is categorized as small holdings
VILLAGE LEVEL ENERGY UTILIZATION OF COPRA PRODUCTION BY PRODUCTS IN EASTERN VISAYAS, PHILIPPINES
Authors: Engr. Eutiquio E. Sudaria
Published: May 2020

Coconut is one of the important crops of the farmers in Eastern Visayas. Forty‑two percent of the agricultural land of Eastern Visayas is planted to coconut. Coconut farmers are earning money mainly from the main product of coconut which is copra. The price of copra is fluctuating. Hence, there is a need for the farmers to utilize the by‑products of copra production to augment their income. The by‑products depend on the copra making practice of the farmers. For the direct splitting method where the nut with husk is split directly with an axe, combined husk with shell locally known as "binuongan" or "bukong" and water are the by‑products while the husking method has the by­products of separate husk, shell, and water.

 

This paper covers only the utilization of the "binuongan", husk and shell. The water is excluded. Paper also describes the utilization of copra making by‑products practiced by farmers and developed at the Regional Coconut Research Center, VISCA, Baybay, Leyte.
DETAILED ANALYSIS OF 30 FERTELIZER DEMONSTRATIONS IN SOUTHERN THAILAND
Authors: J. Dootson  , J.R.J. Moss  , Sura Rungreung  , Saowannee Meemuth  , K. Ryder  , Maliwan Rattanapruk
Published: May 2020

Twice‑yearly coconut counts taken from 30 different demonstra­tions on Thai Tall palms showed that applying fertilizer increased the number of nuts produced over the 3 years studied. Application of 2kg of a 13:13:21 NPK compound was ‑shown to be more cost effective than applying 4kg of the same compound, but was rarely profitable, as the largest responses occurred in years when yields were high and the farm­gate prices were at their lowest.

 

Sites where nut counts from unfertilized plots were high showed much smaller responses to applied fertilizer than those having lower counts, suggesting that inherently low yielding plots are more likely to respond to applied fertilizer. Nut counts can be considered a simple, cheap and reliable method of anticipating the probability of a fertilizer response.
THE CHLORINE NEEDS OF COCONUTS
Authors: S.S. Magat  , R.Z. Margate
Published: May 2020

A study designed to determine the nutritional needs of coconut from nursery to full‑bearing was conducted from 1974 to 1988 in a Cl-­deficient soil (Topic Tropudalf) of Davao, Southern Philippines.

 

At nursery stage, only chlorine application improved the growth of the seedlings based on girth size which was highly correlated with increased leaf Cl. During the first five years in the field, K and Cl significantly influenced the growth of the palms which were positively correlated to ail growth parameters, i.e. girth, number of leaflets, living fronds and leaf production. During the fifth year, Cl‑fertilization resul­ted in 115% more flowering palms than the unfertilized ones. From then on, Cl application consistently increased nut production, copra weight per nut and copra yield per tree which was correlated with leaf Cl. However, the positive effects of other nutrients like N, K and Mg on yield as well as interaction effects were inconsistent over the years.

 

The nutritional needs of palms for Cl at the nursery stage is 30 g Cl per seedling. Under field condition, the requirement increases with age from 40 g to 1,000 g per palm leveling off at fifth year from planting.
COCONUT INTERCROPPING WITH CASSAVA: AN ECONOMIC ANALYSIS
Authors: PRAFULLA K DAS
Published: May 2020

An evaluation of the impact of Coconut intercropping with Cassava revealed greater returns to the resource management. Contrary to the general belief, the Cassava intercrop was even beneficial to coconut, as plots with this intercrop resulted in marginally higher yields than the plots with coconut alone.
PHYSIOLOGICAL AND BIOCHEMICAL BASES OF COCONUT PRODUCTION
Authors: V. RAJAGOPAL  , KV KASTURIBAI  , S. SHIVASHANKAR
Published: May 2020

The relevance of the physiological arid biochemical investigations on coconut production has been amply proved. The physiological data on the seedling characters arid the equations developed for leaf area arid dry matter production proved to be valuable tools for application in the nursery selections. The experimental evidence provided by the biochemical studies opened up new vistas for utilising some of the biochemical markers related to the processes of growth arid yield in coconut palms. The rapid screening technique developed for drought tolerance offers a good scope for evaluating the germplasm collections. That the scientific management practices could substantially enhance the yield potential of root (wilt) diseased palms has been convincingly delineated.
COCONUT AGRICULTURAL RESEARCH IN THE PHILIPPINES ITS HISTORY, TECHNOLOGICAL ADVANCES AND FUTURE TARGETS
Authors: Dr. SEVERINO S. MAGAT
Published: May 2020

The paper deals with selected aspects of agricultural research on coconuts in the Philippines as follows : (a) a historical review; (2) agricultural research system; (3) scientific and technological advances and findings; and (4) future development oriented targets.

 

Recognizing the need to support the development of the coconut industry under a sustainable and profitable coconut farming environ­ment, the R & D Thrusts of agricultural research centers on : 1) Varietal Improvement; 2) Cultural and Fertilizer Management (with emphasis on Integrated Soil Fertility Management; 3) Integrated Crop Protection; 4) Cadang‑cadang disease control; 5), Processing and Utilization of Coconut Wood; and 6) Technical Support Services and Advisory Development.
UPTAKE, TRANSLOCATION AND PERSISTANCE OF CARBENDAZIM IN COCONUT IN RELATION TO CONTROL OF STEM BLEEDING DISEASE
Authors: ANIL KUMAR  , K.K.N. Nambiar  , S.R. VOLETI
Published: May 2020

Uptake, translocation and persistance of carbendazim in coconut in relation to control of stem bleeding caused by Thielaviopsis paradoxa was studied. The fungicide when applied through a single root @ 10g Bavistin/palm, was detected up to 2m height in the trunk of treged palms on feeding side, whereas no fungicide was detected from remaining three sides. In the former case, the furigicide accumulated in sufficient concentrations to arrest the internal decay for six months. The residues detected in nut water from nuts of different maturity from treated adult palms (20 ‑ 25 yrs.) were within safe limits.
DROUGHT MANAGEMENT OF COCONUT HOLDINGS
Authors: Dr. D. V. Liyanage
Published: May 2020

Prolonged droughts retard growth of coconut palms and reduce production. Current systems of chemical farming in coconut holdings do not mitigate adverse drought effects on palms. They should be replaced with bio‑farming techniques, which will result in improvement of structure, water holding capacity and fertility of the soil, thereby delaying onset of soil moisture stress during dry seasons.

 

With the drought management practices based on mulching bio-farming, soil nutrients are released gradually so that coconut production is sustained at a high level without much fluctuations through‑out the years. Further, that technology is simple and large investments are not necessary, particularly application of the Coconut/Gliricidia model. Cost of production of coconuts is reduced with bio‑farming.
NEEM PRODUCTS AGAINST COCONUT INSECT PESTS
Authors: S. Sadakathulla
Published: May 2020

Three field experiments were conducted to find out the efficacy of neem products against the damage of rhinoceros beetle to coconut palm and termite damage to coconut palm and plaited leaves. The application of cither neem seed powder + sand (1:2) or neem seed kernel powder + sand (1:2) @ 150 g mixture per palm in the bases of three leaf axils in the crown, were found more effective against rhinoceros damage. Spraying of neem oil 5% or neem seed kernel extract 20% from the base and up to, 2 m height on the truck protected the palm from termites. Spraying with copper sulphate 1% and‑then neem oil 5% or copper sulphate 1% and then neem seed kernel extract 20% on plaited coconut leaves was found efficacious in protecting plaited coconut leaves for more than six months even when the plaited leaves were kept on the bare ground having persistent live termite colony throughout the year.
Digital transformation in economy and law
Authors: Gutbrod Max
Published: May 2020

This article gives an expansive overview of the changes in the economy, and in processes performed by both companies and the society at large, that are likely to accompany digitalization in light of the current COVID-19 crisis. In giving this broad overview, the article highlights the consequences for the structure of the economy that the growth of groups of companies profiting from digitalization will have, and the social issues that are linked to such growth. Also, the article offers thoughts on how different areas of activity, such as of companies as well as of education and science, are likely to change.
A Numerical Method for Determining the Elements of Circumbinary Orbits and Its Application to Circumbinary Planets and the Satellites of Pluto-Charon
Authors: Woo Jason Man Yin , Lee Man Hoi
Published: May 2020

Planets and satellites orbiting a binary system exist in the solar system and extrasolar planetary systems. Their orbits can be significantly different from Keplerian orbits, if they are close to the binary and the secondary-to-primary mass ratio is high. A proper description of a circumbinary orbit is in terms of the free eccentricity e
free at the epicyclic frequency κ
0, forced eccentricity e
forced at the mean motion n
0, and oscillations at higher frequencies forced by the non-axisymmetric components of the binary’s potential. We show that accurate numerical values for the amplitudes and frequencies of these terms can be extracted from numerical orbit integrations by applying fast Fourier transformation (FFT) to the cylindrical distance between the circumbinary object and the center of mass of the binary as a function of time. We apply this method to three Kepler circumbinary planets and the satellites of Pluto-Charon. For the satellite Styx of Pluto-Charon, the FFT results for κ
0 and e
free differ significantly from the first-order analytic value and the value reported by Showalter & Hamilton, respectively. We show that the deviation in κ
0 is likely due to the effect of the 3:1 mean-motion resonance and discuss the implications of the lower value for e
free.
Constraints on Metastable Helium in the Atmospheres of WASP-69b and WASP-52b with Ultranarrowband Photometry
Authors: Vissapragada Shreyas , Knutson Heather A. , Jovanovic Nemanja , Harada Caleb K. , Oklopčić Antonija , Eriksen James , Mawet Dimitri , Millar-Blanchaer Maxwell A. , Tinyanont Samaporn , Vasisht Gautam
Published: May 2020

Infrared observations of metastable 23S helium absorption with ground- and space-based spectroscopy are rapidly maturing, as this species is a unique probe of exoplanet atmospheres. Specifically, the transit depth in the triplet feature (with vacuum wavelengths near 1083.3 nm) can be used to constrain the temperature and mass-loss rate of an exoplanet’s upper atmosphere. Here, we present a new photometric technique to measure metastable 23S helium absorption using an ultranarrowband filter (FWHM 0.635 nm) coupled to a beam-shaping diffuser installed in the Wide-field Infrared Camera on the 200 inch Hale Telescope at Palomar Observatory. We use telluric OH lines and a helium arc lamp to characterize refractive effects through the filter and to confirm our understanding of the filter transmission profile. We benchmark our new technique by observing a transit of WASP-69b and detect an excess absorption of 0.498% ± 0.045% (11.1σ), consistent with previous measurements after considering our bandpass. We then use this method to study the inflated gas giant WASP-52b and place a 95th percentile upper limit on excess absorption in our helium bandpass of 0.47%. Using an atmospheric escape model, we constrain the mass-loss rate for WASP-69b to be

(

) at 7000 K (12,000 K). Additionally, we set an upper limit on the mass-loss rate of WASP-52b at these temperatures of

(

). These results show that ultranarrowband photometry can reliably quantify absorption in the metastable helium feature.
Sunquakes of Solar Cycle 24
Authors: Sharykin Ivan N. , Kosovichev Alexander G.
Published: May 2020

The paper presents results of a search for helioseismic events (sunquakes) produced by M-X class solar flares during Solar Cycle 24. The search is performed by analyzing photospheric Dopplergrams from the Helioseismic Magnetic Imager. Among the total number of 500 M-X class flares, 94 helioseismic events were detected. Our analysis has shown that many strong sunquakes were produced by solar flares of low M class (M1–M5), while in some powerful X-class flares helioseismic waves were not observed or were weak. Our study has also revealed that only several active regions were characterized by the most efficient generation of helioseismic waves during flares. We found that the sunquake power correlates with the maximum value of the soft X-ray flux time derivative better than with the X-ray class, indicating that the sunquake mechanism is associated with high-energy particles. We also show that the seismically active flares are more impulsive than the flares without helioseismic perturbations. We present a new catalog of helioseismic solar flares, which opens opportunities for performing statistical studies to better understand the physics of sunquakes as well as the flare-energy release and transport.
ALMA Observations of Quasar Host Galaxies at z ≃ 4.8
Authors: Nguyen Nathen H. , Lira Paulina , Trakhtenbrot Benny , Netzer Hagai , Cicone Claudia , Maiolino Roberto , Shemmer Ohad
Published: May 2020

We present ALMA Band 7 data of the [C ii] 

emission line and underlying far-IR (FIR) continuum for 12 luminous quasars at

powered by fast-growing supermassive black holes (SMBHs). Our total sample consists of 18 quasars, 12 of which are presented here for the first time. The new sources consist of six Herschel/SPIRE-detected systems, which we define as “FIR-bright” sources, and six Herschel/SPIRE-undetected systems, which we define as “FIR-faint” sources. We determine dust masses for the quasars hosts of

, implying interstellar medium gas masses comparable to the dynamical masses derived from the [C ii] kinematics. It is found that, on average, the Mg ii line is blueshifted by

with respect to the [C ii] emission line, which is also observed when complementing our observations with data from the literature. We find that all of our FIR-bright subsample and most of the FIR-faint objects lie above the main sequence of star-forming galaxies at

. We detect companion submillimeter galaxies for two sources, both FIR-faint, with a range of projected distances of

kpc and typical velocity shifts of

from the quasar hosts. Of our total sample of 18 quasars, 5/18 are found to have dust-obscured star-forming companions.
Observing the Earliest Stages of Star Formation in Galaxies: 8 μm Cores in Three Edge-on Disks
Authors: Elmegreen Bruce G. , Elmegreen Debra Meloy
Published: May 2020

To study the vertical distribution of the earliest stages of star formation in galaxies, three edge-on spirals, NGC 891, NGC 3628, and IC 5052, observed by the Spitzer Space Telescope InfraRed Array Camera (IRAC) were examined for compact 8 μm cores using an unsharp mask technique; 173, 267, and 60 cores were distinguished, respectively. Color–color distributions suggest a mixture of polycyclic aromatic hydrocarbons and highly extincted photospheric emission from young stars. The average V-band extinction is ∼20 mag, equally divided between foreground and core. IRAC magnitudes for the clumps are converted to stellar masses assuming an age of 1 Myr, which is about equal to the ratio of the total core mass to the star formation rate in each galaxy. The extinction and stellar mass suggest an intrinsic core radius of ∼18 pc for 5% star formation efficiency. The half-thickness of the disk of 8 μm cores is 105 pc for NGC 891 and 74 pc for IC 5052, varying with radius by a factor of ∼2. For NGC 3628, which is interacting, the half-thickness is 438 pc, but even with this interaction, the 8 μm disk is remarkably flat, suggesting vertical stability. Small-scale structures like shingles or spirals are seen in the core positions. Very few of the 8 μm cores have optical counterparts.
The Confinement of the Heliosheath Plasma by the Solar Magnetic Field as Revealed by Energetic Neutral Atom Simulations
Authors: Kornbleuth M. , Opher M. , Michael A. T. , Sokół J. M. , Tóth G. , Tenishev V. , Drake J. F.
Published: May 2020

Traditionally, the solar magnetic field has been considered to have a negligible effect in the outer regions of the heliosphere. Recent works have shown that the solar magnetic field may play a crucial role in collimating the plasma in the heliosheath. Interstellar Boundary Explorer (IBEX) observations of the heliotail indicated a latitudinal structure varying with energy in the energetic neutral atom (ENA) fluxes. At energies ∼1 keV, the ENA fluxes show an enhancement at low latitudes and a deficit of ENAs near the poles. At energies >2.7 keV, ENA fluxes had a deficit within low latitudes, and lobes of higher ENA flux near the poles. This ENA structure was initially interpreted to be a result of the latitudinal profile of the solar wind during solar minimum. We extend the work of Kornbleuth et al. by using solar minimum–like conditions and the recently developed Solar-wind with Hydrogen Ion Exchange and Large-scale Dynamics (SHIELD) model. The SHIELD model couples the magnetohydrodynamic plasma solution with a kinetic description of neutral hydrogen. We show that while the latitudinal profile of the solar wind during solar minimum contributes to the lobes in ENA maps, the collimation by the solar magnetic field is important in creating and shaping the two high-latitude lobes of enhanced ENA flux observed by IBEX. This is the first work to explore the effect of the changing solar magnetic field strength on ENA maps. Our findings suggest that IBEX is providing the first observational evidence of the collimation of the heliosheath plasma by the solar magnetic field.
Blue Coma and Red Surface of 174P/Echeclus: Two Sides of the Same Coin?
Authors: Zubko Evgenij , Videen Gorden , Kulyk Iryna
Published: May 2020

Seccull et al. (2019) report a dramatic difference in the color of the coma and surface of Centaur 174P/Echeclus. While the coma was blue in appearance, the surface was red. A similar phenomenon was found in laboratory optical measurements of single-scattering feldspar particles and of a surface comprised of these same particles. Thus, the observations do not necessarily suggest different chemical composition and size distribution of dust in the coma and surface of 174P/Echeclus. Instead, the observed difference could arise from multiple-scattering phenomena that makes a significant contribution to light scattering by a regolith, but does not appear in an optically thin coma.
Produção de adsorvente alternativo a partir de lodo têxtil industrial e lodo de esgoto para tratamento de efluente sintético
Authors: Forgiarini Ana Luiza , Casanova Joice Gnoatto , Domenico Michele Di , Souza Fernanda Batista de
Published: May 2020

Os problemas enfrentados pelos setores industriais com destinação de seus resíduos têm se tornado cada vez maiores, uma vez que há uma produção excessiva destes resíduos. O lodo é um subproduto gerado tanto na indústria têxtil quanto nas estações de tratamento de esgoto, e apresenta composição diversificada conforme o tipo do material de origem. Outra preocupação da indústria têxtil é quanto ao tratamento dos efluentes, que são contaminados com corantes de difícil degradabilidade. Considerando esta problemática, pode-se propor processos de tratamento dando uma destinação alternativa ao lodo produzido, como por exemplo, a adsorção. Nesse estudo, o lodo têxtil e o lodo de esgoto passaram por tratamentos térmicos e químicos baseados em um planejamento fatorial 2³, variando temperatura, tempo e massa de catalisador. Os adsorventes produzidos obtiveram porcentagens de remoção do corante Vermelho Remazol RR acima de 90%. As variáveis significativas estatisticamente foram tempo e temperatura para o lodo têxtil industrial e temperatura para o lodo de esgoto. Para o lodo têxtil industrial a interação entre as variáveis também foi significativa para o processo. Foi possível concluir que os materiais produziram adsorventes eficientes para a remoção do corante estudado. Logo, a utilização destes na adsorção aumentam as alternativas de destinação sustentável desse tipo de resíduo.
Avaliação ambiental da estabilização por solidificação de BTEX oriundo de resíduo de adsorvente composto por cinza de casca de arroz e carvão ativado em argamassa
Authors: Schneider Joice Brochier , Moraes Carlos Alberto Mendes , Brehm Feliciane Andrade
Published: May 2020

O objetivo deste trabalho foi avaliar ambientalmente a estabilização por solidificação (e/s) dos contaminantes BTEX presentes em resíduo de adsorvente composto de cinza de casca de arroz e carvão ativado, em matriz de cimento Portland. Foram confeccionadas argamassas substituindo-se o agregado natural, em volume, pelo resíduo (10% e 30%). Essas argamassas foram caracterizadas ambientalmente pelas normas brasileiras, bem como também se realizou espectroscopia de infravermelho e análise dos extratos de lixiviado e solubilizado frente a estes contaminantes. As argamassas confeccionadas foram classificadas como resíduo Classe IIA, resíduo não perigoso, não inerte. Estes resultados, associados à espectroscopia de infravermelho e ao odor característico dos corpos-de-prova confirmam a estabilização do contaminante na matriz de cimento Portland. Desta forma, o trabalho indica o potencial de aplicação do resíduo CCA/CA contaminado com hidrocarbonetos de petróleo em produtos da construção civil.
Compostagem de resíduos sólidos orgânicos como ferramenta da educação ambiental para aprendizagem e desenvolvimento social
Authors: Silva Kelvis Nunes da , Ferreira Juliana Cardoso , Bitencourt Emanoelen Bitencourt e , Loureiro Glauber Epifânio
Published: May 2020

Este trabalho foi desenvolvido com o objetivo de incentivar os alunos de uma turma do 1ª ano do ensino médio, por meio da Educação Ambiental, como reciclar e utilizar os resíduos sólidos orgânicos através do método de compostagem. O projeto de compostagem foi apresentado aos professores e alunos, juntamente com palestras sobre a temática, além da aplicação de questionários para obtenção de dados com o intuito de quantificar o resultado das palestras e o entendimento dos alunos. Foi possível implantar o projeto de compostagem dentro do espaço da própria escola, o que acarretou no envolvimento dos participantes proporcionando aos alunos e professores um trabalho ambiental em conjunto. O entendimento dos alunos após a aplicação dos questionários mostrou-se satisfatório identificando que o assunto sobre resíduos sólidos já foi discutido em sala de aula o que ajudou em alguns aspectos. Com tudo, no decorrer deste projeto a compostagem se mostrou uma ferramenta estratégica e eficaz na difusão da Educação Ambiental.
Fragilisation de la définition collective du travail bien fait… et emprise des indicateurs d’activité
Authors: Loriol Marc
Published: May 2020

La mise en place d’indicateurs d’activité dans les organisations publiques ou privées comme mode de management produit une réduction du sens du travail et une fragilisation des règles de métier. Cela induit des résistances de la part des salariés et des collectifs de travail. Pourtant, dans certains cas, le chiffre peut devenir une référence importante pour les salariés. Les cas de deux policiers d’une brigade de police de proximité et d’une scène de musiques actuelles ( smac ), issus de deux recherches qualitatives (observations et entretiens), illustrent le lien entre l’attachement aux résultats quantitatifs d’activité et la difficulté à construire ensemble un sens positif et valorisant au travail. La comparaison avec d’autres collectifs de travail dans des organisations du même type permet de mettre en évidence les limites et les risques d’une valorisation de soi par les chiffres.
Externaliser les services d’entretien des collèges : une économie pour les finances publiques ?
Authors: Devetter François-Xavier , Valentin Julie
Published: May 2020

Cet article étudie les conséquences financières des processus d’externalisation des agents de services en charge de l’entretien des établissements scolaires. Sur la base d’une monographie et de statistiques nationales, il compare l’ensemble des coûts, d’abord pour la collectivité commanditaire puis d’une manière plus large pour les finances publiques en tenant compte de divers effets fiscaux et sociaux. Il apparaît que l’externalisation doit s’appuyer sur d’importantes réductions de volume de travail pour permettre de réelles économies budgétaires. Cela pose des questions sur les impacts de ces stratégies en matière sociale et en termes de qualité de service.
La promesse d’un changement ?
Authors: Nadeau Jean-Benoît
Published: May 2020

On se souviendra longtemps de l’année 2020 et des effets de la COVID-19 : des milliards de personnes confinées à domicile aux quatre coins du globe pendant des mois, la pire récession économique mondiale depuis la Grande Dépression et une cascade d’autres problèmes de nature politique, sociale et technique parfois insolubles.
Faut-il avoir peur du changement organisationnel ?
Authors: Johnson Kevin , Autissier David , Gril Emmanuelle
Published: May 2020

Que ce soit pour surmonter les crises qui secouent nos sociétés, pour mieux faire face à la concurrence ou pour suivre le rythme effréné des progrès technologiques, les entreprises enclenchent des cycles accélérés de changement. Or, ces phases successives peuvent faire naître un sentiment de saturation chez les employés, qui peinent à suivre la cadence. Alors, calamité ou bienfait, le changement ?
Le sens, gardien de la cohérence
Authors: Johnson Kevin , Groulx Patrick , Gril Emmanuelle
Published: May 2020

Plusieurs équipes ne savent plus où donner de la tête tellement les projets de changement se succèdent et transforment leur quotidien. Cependant, d’autres sont capables de changer et sont prêtes à le faire rapidement. Pourquoi ?
Les destinataires et les intentions de Grégoire de Tours
Authors: Filion Sébastien
Published: May 2020

Cet article s’intéresse aux Histoires de Grégoire de Tours et vise à démontrer que l’auteur s’adressait principalement aux futurs rois Théodebert II et Thierry II afin de les exhorter à ne pas replonger la Gaule dans la guerre civile. Pour ce faire, il est d’abord essentiel de déterminer le moment de la rédaction des Histoires et les principaux destinataires ciblés par l’auteur. C’est pourquoi les deux premières sections sont consacrées à soutenir l’hypothèse d’une rédaction tardive et à identifier les fils de Childebert II comme étant les rois les plus directement interpelés. Finalement, la dernière section propose une discussion de la préface du cinquième livre des Histoires , l’un des chapitres les plus importants de l’ensemble de l’œuvre, pour illustrer la rhétorique, inspirée de la tradition de l’Antiquité tardive, utilisée par l’auteur dans l’ensemble de son œuvre.
Primauté technologique ou antériorité sociale dans la mesure des mouvements sociaux ? Le cas du Sénégal et de la Tunisie
Authors: TINE Benoît , ELHAOU Mohamed-Ali
Published: May 2020

Cette recherche réflexive vise à revenir sur les événements sociopolitiques ayant marqué au début des années 2000 le Sénégal et la Tunisie. Elle vise dans un premier temps à mettre en exergue deux points de césure qui ont caractérisé la littérature : la thèse de la primauté technologique ou encore les TIC génératrices de mouvements sociaux d’une part ; et d’autre part le postulat de l’antériorité sociale c'est-à-dire les TIC comme solubles dans les mouvements sociaux. Cet article interroge, dans un deuxième temps, les manières de faire un mouvement social et la multiplication des médiatisations et de diffusion des idées et des images dans les espaces numériques tels que Facebook, Twitter, You Tube et les Smartphones pour arriver à une position novatrice, médiane et heuristique. Cette articulation est d’autant plus intéressante qu’elle conjugue deux contextes qui sont rarement analysés ensemble dans le champ des sciences sociales à savoir le Sénégal d’un côté – considéré dans la littérature scientifique comme faisant partie des pays africains au sud du Sahara – et la Tunisie étudiée comme faisant partie dudit « monde arabe ». Par cette contribution, nous voulons briser cette catégorisation et montrer la filiation et la possibilité d’élaborer une recherche commune établissant des ponts entre ces deux pays. Notre démarche consiste dès lors à proposer une perspective médiane c’est-à-dire une approche communicationnelle remettant en question les schèmes explicatifs dominants. Elle a pour principal projet, dans un troisième temps de cet article, de dévoiler les enjeux liés à la technologisation de plus en plus repérable des mouvements sociaux.
L’impact des TIC sur le développement de deux mouvements sociaux au Mexique : Le mouvement zapatiste et le Mouvement pour la Paix avec Justice et Dignité
Authors: Arias Víctor G. Sánchez , Villalobos Juan Manuel Martínez
Published: May 2020

Sans aucun doute, la société de la connaissance, basée sur le développement continu et spectaculaire des TIC est maintenant la principale source de développement économique, social et culturel dans le monde ; mais pas pour tous les pays du monde. Cette inégalité est non seulement technologique et économique, en termes de l'infrastructure requise, connu comme la fracture numérique ; mais aussi d'autre encore plus inquiétant, la fracture cognitive dans le contexte de crise structurelle globale qui se reflètent dans l'émergence de nouveaux mouvements socio-politiques dans le monde et qui réclament des changements plus démocratiques et équitables à leurs sociétés. Il est dans ce contexte que nous présentons dans cet article une étude sur l'impact des TIC sur le développement de deux mouvements sociaux au Mexique : Le mouvement Zapatiste et le Mouvement pour la Paix avec Justice et Dignité. Cette étude vise non seulement à mieux comprendre le phénomène de l'appropriation sociale-politique des technologies de ces mouvements, mais aussi être une référence à soutenir d'autres plus récentes, tels que le mouvement des 43 étudiants disparus d´Ayotzinapa, et ainsi de cette manière à contribuer aux transformations indispensables des pays comme le nôtre.
Navigating the STEM Professoriate as a Black Woman
Authors: Powell Nichole L.
Published: May 2020

The absence of faculty diversity continues to plague American colleges and universities, with about 6% of associate and 4% of full professors identifying as Black or African American, based on a 2016 survey conducted by the National Center for Education Statistics. This chapter will reflect on the personal experiences of a Black woman in STEM, examining whether diversity efforts have affected the number of Black and African American women in the STEM professoriate. It includes current efforts regarding diversity and inclusion, as well as recommendations of ways that institutions can help to foster a sense of belonging.
Rediscovering Our Original Selves
Authors: Grant Christine Sharon
Published: May 2020

STEM careers are complex, requiring the management, monitoring, and implementation of several different technical and interpersonal interactions. For women of color (WOC), the journey is complex as they are impacted by issues of bias, marginalization, and unconscious bias. Finding opportunities to reflect, rejuvenate, and regenerate requires strategic planning to explore the positive and negative elements in your STEM career box. In this work, the author reflects on a 30 year STEM career, challenging the reader to explore their own career trajectory in the context of a conceptualized STEM success cycle.
Circular Economy and Risk Management Synergies in Disruptive Environments
Authors: Olalla-Caballero Beatriz , Mata-Fernández Montserrat
Published: May 2020

Circular economy and innovation are creating a new scenario for companies. There are many frameworks in the market, which allow a company to manage risks. In this chapter, some of these frameworks are analyzed to try to determine how helpful they are in an enterprise to succeed in managing risks. The authors have been working with one of the existing risks frameworks of risk management, but digital transformation and circular economy have introduced new variables and factors that have to be taken into account. New features need to be defined into a new risk management framework, having in mind the velocity of change of information technologies. Success factors are also considered to complete this perspective.
Application of Isenberg Model for Entrepreneurial Ecosystems as a Blueprint for Zimbabwe Socio-Economic Devolution
Authors: Munyanyiwa Takaruza
Published: May 2020

Entrepreneurship plays a significant role in national economies around the world, including the Republic of Zimbabwe, which has largely focused on the socio-economic devolution program. The necessity for entrepreneurship and policymakers around the world currently is to advance the quality of the entrepreneurship outcomes rather than just increase the number of entrepreneurs. To strengthen the context of entrepreneurship and innovation, the authors suggested that governments need to move to what is called an entrepreneurial ecosystem approach. Isenberg's model for the entrepreneurial ecosystem is applied as a catalyst for building a robust entrepreneurial ecosystem under circular economies.
Knowledge Management for the Circular Economy
Authors: Atiku Sulaiman Olusegun
Published: May 2020

The place of knowledge management in ensuring effective transition into a circular economy by developing a circular business model as an alternative to the conventional linear economic model is under-investigated. Knowledge coordination, creation, and dissemination capability of a firm are important in developing the green industry and offering new job opportunities. This chapter adopted a literature review approach to establish the link between knowledge management and transition into a circular economy. Findings show that the firm's eco-innovation process depends largely on strategic knowledge management. Therefore, systems understanding and self-motivated creativity are essential professional knowledge levels in developing circular business models for sustainability. Hence, firms need to enhance the knowledge-based for continuous business process improvement, eco-efficiency, and eco-innovation.
Leadership to Cultivate the Circular Economy
Authors: Saini Damini , Agarwal Juhi
Published: May 2020

A business meets the need of the present world and the environment without compromising the requirement of the current scenario, that is, sustainability of the resources. Everyone affects the sustainability of the marketplace and the Earth in some way or another. Sustainable development within a business is able to create value for customers, investors, and the environment. This naturally involves taking a long-term perspective and balancing economic, environmental, and social impacts of business. In today's business environment, it is highly important that organizations develop and adhere to the appropriate policies and systems that create a sustainable future for the world. The purpose of this chapter is to highlight the circular economy and the critical role leadership will play in it. The authors describe the circular economy and its major concepts and approaches along with its background. Further, the major challenges and encounters of leadership in a circular economy are also discussed.
Thermal Expansion of Composite System Epoxy Resin/Recycled Carbon Fibers
Authors: Dvořáčková Štěpánka , Kroisová Dora
Published: May 2020

This experimental study deals with the problematics of thermal expansion α [10-6/K] of the composite systems based on recycled carbon fibres reinforced epoxy resin. The epoxy resin CHS – EPOXY 520 (EPOXY 15), cured with the hardener P11 (Districhem, s.r.o.), was chosen as a sample matrix. Recycled carbon fibres with a diameter of 7 μm and a length of 100 μm (Easy Composites Ltd.) were the filler. In the experiment, samples with the fulfilment of 10, 20, 40, 60, 80, 90 and 100 phr were prepared. The samples were being poured into silicone molds, cured at an overpressure of 0.7 MPa and a temperature of 23 ± 2 °C for 24 hours. A thermomechanical analyzer was used to determine the thermal expansion of composite systems. The addition of recycled carbon fibers to epoxy resin can reduce the coefficient of linear thermal expansion at 20°C in half, from the original α = 45 to 55 × 10-6/K for non-filled epoxy resin to α = 25 to 27 × 10-6/K for filled epoxy resin. Optimal filling is at the level of 40 phr, with higher filling there is no further reduction of the linear thermal expansion coefficient.
Biogenic Nanoparticles of Calcium Carbonate - Preparation and Behaviour
Authors: Kroisová Dora , Dvořáčková Štěpánka
Published: May 2020

Calcium carbonate is one of the most widespread natural material. Biogenic calcium carbonate nanoparticles are biocompatible. Currently, they are of great interest for their possible applications, especially in medicine. The aim of this introductory experimental study is to present a simple preparation of biogenic nanoparticles of calcium carbonate from natural resources with a subsequent specific behaviour of nanoparticles in aquatic environment. Different type of shells were used for the preparation of nanoparticles. All structures were burned at 850°C and then grounded to powder. The obtained powders were left in normal laboratory environment for 2 weeks and then placed in beakers with distilled water. Subsequently, two homogenization routes were used - stirring at 1000 rpm for 5 minutes and ultrasonic stirring for 5 minutes. One part of the particles was separated at the bottom of the beaker, but small formations started to create a fractal structure on the surface of water. These formations gradually increased. Crystalline interconnected structures built up with nanoparticles were confirmed by a subsequent analysis by a scanning electron microscope. EDX analysis confirmed the presence of calcium carbonate.
Analysis for the Joining of Light Alloys by Numerical Experiment
Authors: Kraváriková Helena
Published: May 2020

The current paper deals with the application of numerical experiment of joining light alloys. Modelling and numerical simulation and finite element method in the ANSYS program were used to investigate the course of thermal cycles, the joining process of light alloys by welding. Joining process of light alloys by welding is defined as a moving point source of heat, which generates temperature fields of various kinds, depending on the time and thickness of the material being welded. The paper is therefore devoted to: Thermal energy transfer and solution to differential equation of heat conduction, Initial and boundary conditions for temperatures distribution of a moving point source of heat, Generation (definition) of thermal cycle. Another part of the paper deals with the analysis of the heat-affected zone. Of the result of the solution will be expressed as the temperature field generated in the base material during the welding process.
The Selection of Materials for the Auto-Body Deformation Zones
Authors: Evin Emil , Tomáš Miroslav
Published: May 2020

Nowadays, it is important to select the proper material for parts of the car-body’s deformation zones in terms of passenger safety. Due to wide range of high-strength steels on the market, the article presents the way of selecting the material by determining the deformation work and the stiffness constant, both measured by the stretch-bending test. The procedure was verified on a high-strength micro-alloyed steel HSLA, high-strength multi-phase steels DP 600 and TRIP, and an austenitic stainless steel AISI 304. The results indicate the austenitic steel is better to use in the deformation zones for the frontal impact, while multi-phase steels are more suitable for deformation zones at the lateral impact. The regression model describing the dependence of the deformation work measured at the stretch-bending test and the deformation work measured at uniaxial tensile test was defined as well. The model allows predicting the deformation work at stretch-bending test based on the mechanical properties measured by the tensile test.
Tool for Strengthening of the Component Surface Layers
Authors: Králik Marian , Jerz Vladimír , Bachratý Michal
Published: May 2020

The operational characteristics of metal components are often determined by the status of surface. In mechanical loading of solid bodies, the impact of the surface properties on formation and spreading of surface cracks is obvious, mainly as regards cyclic loading. Therefore, it is important to pay attention to knowledge of surface properties and their improvement.Cold plastic deformation is the easiest way to change the mechanical properties of the materials. The possibility of surface strengthening by ball or roller burnishing was found 80 years ago and since then has spread mainly into engineering and the automotive industry.In the authors’ workplace, experiments for surface layer hardening without ultrasound were realized with a newly developed device where the compressive force was applied statically, not dynamically. In the experimental part, we focused on the status of surface layers, especially the microstructure, hardness and roughness.