1,721,657 research outputs found
Review of “Virtual Life in Iran: Emotions and Subcultures in Online Social Networks” authored by Mohammad Saeed Zokaei & Simin Veisi
Full text linkVirtual Life in Iran: Emotions and Subcultures in Online Social Networks authored by Mohammad Saeed Zokaei & Simin Veisi. Tehran, Iran: Agah Publication, 2020. 528 pp., ISBN 978-964-416-442-2
Development of top key performance indicators for enhancing hse commitment in selected companies / Torabi Mohammad Saeed
Full text linkEnhancing awareness regarding health, safety, and environmental (HSE) matters
would alone not enforce managers to follow HSE requirements in practice. The HSE
culture in business is constructed based on the outcomes of practices in the short term.
In fact, managing HSE performances in the short term would shape HSE culture in the
long term.
A proper safety performance indicator is a basic management tool for manager
decisions. Managers need the right information at the right time, which means they
require reliable, relevant, sufficient, and effective data. Time is a hidden layer, extended
in line with all business activities, decision making and performance assessment. This
HSE performance measurement network should be developed among all managers in
both static and dynamic concepts. No matter what kind of HSE management system is
being implemented in a company, network communication in static concept requires
each manager to have the right indicators for oneself at the right time. In a dynamic
concept, this network should have the right Key Performance Indicator (KPI) to compile
operational indicators into strategic drivers. On the other hand, the time period for data
collection in a static concept should be adjusted within one timeline without overlapping
or missing data. Blue time (BT) is the adjusted time (period of reporting) over a timeline
that was developed by the author.
This research was conducted on an industrial scale, by interviewing 108 managers
from different organizational levels. The managers were all from Iran and Malaysian
companies. Managers were asked to select 5 of 45 HSE indicators presented to them, PI
while they shared the favored time for performance data gathering and HSE data
reporting. The following three objectives were explored: 1) empirical investigating the
top five HSE performance indicators, 2) developing BT after time investigation for
performance reporting, and 3) investigating the top HSE KPIs. Three complementary
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studies were carried out to address two specifications of HSE communication in the
network and to clarify the social benefit of the explored top HSE KPIs.
For the dynamic concept, total hazard potential (THP) was found as the top HSE
KPI, which was a risk based indicator. THP is calculated based on the safety barriers,
unsafe act (UA) and unsafe conditions (UC). Iranian Companies have primarily
developed this KPI. BT is the optimized time period for data collection by each
management level at the dynamic concept.
Contrary to the main objectives, the complementary objectives highlighted that there
were significant differences among managers with different point of views. Other
complementary studies, through statistical tests, clarified that a manager could not
repackage the collected performance HSE reports (input data) and send these out
directly. As there are no previous exploratory study on this them, the methodology of
this research was exploratory with spiral approaches. This means that, after collecting
data at each stage, the next stage proceeded by applying new filtering controls. The HSE
communication network for the dynamic concept was constructed based on primary
data in the statistical concept. Finally, the impacts of the findings were studied
Investigation of planing vessels motion using nonlinear strip theory–an experimental and numerical study
No full textThis study is aimed to improve Zarnick’s (1978, A nonlinear mathematical model of motions of a planing boat in regular waves. David W. Taylor Naval Ship Research and Development Center, Bethesda, MD, USA) analytical model for motions of planing vessels. A nonlinear time domain mathematical model was developed for dynamic behaviour of longitudinal motion of high-speed planing crafts in regular waves. This model was based on two-dimensional strip theory method using expanding wedge theory and momentum. Due to the nonlinearity and complex dynamic behaviour of these vessels, the time-domain simulation was adopted. Total resistance, heave and pitch motions as well as acceleration were found very sensitive to hydrodynamic coefficients. Furthermore, a set of forced oscillation and seakeeping tests on a vessel were carried out for different conditions at the Marine Engineering Research Centre of Sharif University of Technology (MERC). The effect of velocity, wavelength, and hydrodynamic coefficients were investigated on vessel motions. According to the results, decreasing added mass coefficients, velocity of the model increases. The amplitude of heave and pitch motions declined due to an increase in velocity, within the tested speed range, or by reduction of λ/L ratio. Hydrodynamic coefficients of the mathematical model have been modified accordingly, and the model represented a better agreement with the experimental data obtained by Fridsma (1969. A systematic study of the rough-water performance of planing boats. Tech. Rep. Davidson Laboratory, Stevens Institute of Technology, Hoboken, NJ, USA). This model was applied to identify the nonlinear dynamics of these vessels in both semi-planing and planing phases that can be further expanded to hybrid vessels in the future
sj-docx-1-inq-10.1177_00469580221148867 – Supplemental material for The Challenges of Caring for an Adult Child with Schizophrenia in the Family: An Analysis of the Lived Experiences of Older Parents
No full textSupplemental material, sj-docx-1-inq-10.1177_00469580221148867 for The Challenges of Caring for an Adult Child with Schizophrenia in the Family: An Analysis of the Lived Experiences of Older Parents by Mehdi Sharifi, Seyyed Jalal Younesi, Mahshid Foroughan, Mohammad Hadi Safi and Mohammad Saeed Khanjani in INQUIRY: The Journal of Health Care Organization, Provision, and Financing</p
Feasibility of using recycled concrete aggregate in dense-graded and gap-graded hot mix asphalts / Mohammad Saeed Pourtahmasb
Full text linkIn recent years, several studies have been carried out on the utilization of Construction and Demolition (C&D) wastes in developed countries, particularly the reuse of waste materials in new construction sectors. Both scientists and policy-makers have sought to explore the environmental and economic advantages of waste material recycling. Recycled Concrete Aggregate (RCA), produced from the demolition of concrete structures such as buildings, bridges and dams, is one of the largest wastes in the world in terms of volume. RCAs have different physical, chemical and mechanical properties to natural aggregates. In particular, the porous structure of the concrete and cement paste often attached to the surface of the recycled aggregates can lead to lower abrasion resistance, lower density and higher absorption than virgin aggregates. At the same time, there have been some recent studies showing the successful use of RCA materials in new concrete constructions. Several studies have also been carried out on the possibility of using RCA in base and sub-base either as unbound materials or bitumen-treated or cement-treated granular materials.
The present study presents experimental research on the feasibility of utilizing RCAs in stone mastic asphalt (SMA) and hot mix asphalt (HMA) mixtures for pavements. The RCA materials under study were divided into three categories: Fine RCA (F-RCA) containing aggregate particle sizes of 2.36 mm and smaller; Coarse RCA (C-RCA) containing aggregate particle sizes larger than 2.36 mm; and mixtures of F-RCA and C-RCA, called M-RCA. The Marshall mix design method was used to produce HMA and SMA specimens containing various percentages (0%, 20%, 40%, 60% and 80% by the weight of total mix) and sizes (coarse, fine and mix) of RCA. The volumetric and mechanical properties of these various HMA and SMA specimens were then subjected to a series of tests: Marshall Stability (MS), Flow, Density, Voids in Total Mix (VTM),
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Voids Filled with Asphalt (VFA), Voids in Mineral Aggregates (VMA), Resilient Modulus, Loaded Wheel Tracking (Rutting), Indirect Tensile (IDT) Strength, Moisture Susceptibility and finally Flexural Beam Fatigue tests. The outcomes were statistically analyzed using an analysis of variances (ANOVA).
The test results indicated that, regardless of the size of the RCA particles, using RCA to replace virgin aggregates increases the binder content needed in both HMA and SMA mixtures. However, they also showed that, despite the significant impact of the RCA content on the volumetric and mechanical properties of the asphalt mixtures, utilizing up to 40% coarse, 80% fine and 40% mixed RCA in SMA, and up to 60% coarse, 50% fine and 60% mixed RCA in HMA, can comfortably satisfy the standard requirements, for pavements in terms of project and traffic volumes. At the same time, as SMA mixtures are highly influenced by their aggregate characteristics, particular care needs to be taken with regard to the properties of SMA mixtures containing RCA to ensure these meet the desired performance criteria
Theory of Topological Quantum Phase Transitions in 3D Noncentrosymmetric Systems
Full text linkWe construct a general theory describing the topological quantum phase transitions in 3D systems with broken inversion symmetry. While the consideration of the system’s codimension generally predicts the appearance of a stable metallic phase between the normal and topological insulators, it is shown that a direct topological phase transition between two insulators is also possible when an accidental band crossing occurs along directions with high crystalline symmetry. At the quantum critical point, the energy dispersion becomes quadratic along one direction while the dispersions along the other two orthogonal directions are linear, which manifests the zero chirality of the band touching point. Because of the anisotropic dispersion at quantum critical point, various thermodynamic and transport properties show unusual temperature dependence and anisotropic behaviors
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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