Nonlinear free vibration of beams by one-dimensional and elasticity solutions

2018 Fall.Includes bibliographical references.In this research, linear and nonlinear free vibration are examined. A three-dimensional rectangular parallelepiped free–free beam is studied based on the Ritz method. The equation of motion is derived depending on Hamilton's principle. A validation of the Ritz method formulation has been conducted by comparison with the Euler–Bernoulli beam theory. The impact of three-dimensional beam length has been investigated as well. In terms of nonlinear analysis, a two-dimensional clamped–clamped beam was studied. Total Lagrange formulation is adopted for the elasticity method based on the Green–Lagrange strain tensor and second Piola–Kirchhoff stress tensor. The outcomes of the approximated method have been compared by using the nonlinear Euler–Bernoulli theory depending on the Hermite and Lagrange interpolations. The solutions of both theories are computed according to the direct iteration method. Poisson's ratio effect is studied with two assumptions, as well as the impact of the Gauss evaluations

Prevalence of Burnout Syndrome Among Respiratory Therapists in Saudi Arabia

BACKGROUND: Burnout (BO) is the consequence of chronic work-related stress exposure and is a common syndrome noticed in healthcare providers. Three dimensions typify BO syndrome: emotional exhaustion (EE), depersonalization (DP), and low personal accomplishment (PA). Burnout impacts healthcare workers\u27 performance and efficiency, and therefore on the quality of care provided. Despite the growing research work regarding BO syndrome among healthcare providers, Respiratory Therapists\u27 (RTs) BO has not previously been examined. Therefore, it is essential to determine Respiratory Therapists\u27 BO in Saudi Arabia to address the need for developing BO prevention strategies and wellness programs for RTs. PURPOSE: The study aimed to assess the prevalence of BO among RTs in Saudi Arabia and examine the association between BO and sociodemographic data and professional satisfaction. METHODS: A cross-sectional study involving a convenience sample of RTs in Saudi Arabia was conducted utilizing the Maslach Burnout Inventory (MBI) in addition to questions regarding sociodemographic information and professional satisfaction. RESULTS: Two hundred thirty-six RTs (N=236) were surveyed in this study. The majority of the respondents were male n=130 (55.1%), single n=140 (59.3%), and lived in the central region n=136 (57.6%). The age of the participating RTs in the study ranged from 20 to 58 years, with an average of 28.5 years (SD±5.08). The results showed that RTs had a high level of EE with a mean of 31.97, a moderate level for DP with a mean of 11.39, and a moderate level for lack of PA with a mean of 33.58. Age, gender, the role of the RTs, hours of work, and shift schedule of the participants were associated with BO. The workload was the most work factor among RTs associated with BO. Professional satisfaction of work-life balance, the current job, and monthly income were related to the burnout levels across the three subscales. CONCLUSION: This study was the first to explore BO by MBI and related factors among RTs in Saudi Arabia. Burnout seemed to be a common problem among RTs in Saudi Arabia and was associated with sociodemographic information and professional satisfaction. The findings may help to develop effective intervention strategies to limit and prevent BO. More prospective studies are required with a larger number of participants of RTs

Teaching language skills at the secondary stage in the light of the concept of total quality

This study aimed at identifying the teaching skills degree of Arabic language teachers at secondary schools in Abha in the Asir region. Additionally, to pinpoint variations in the teaching skills degree those are attributable to characteristics (gender and years of experience). There were (195) Arabic language teachers in the secondary schools in Abha who made up the study's sample, which was selected at random. The researcher developed the study instrument, which included listening skills, reading skills, speaking skills, and writing skills, to gather data. The results showed that the level of teaching skills was generally at a moderate level. Also, reading skills were in the first rank with a moderate degree, followed by the listening skills in the second rank with a moderate degree, while the writing skills were in the third with a moderate degree and the last rank were speaking skills, with a moderate degree. However, there were no statistically significant variations in the means of Arabic language teachers' use of teaching skills from the viewpoint of Arabic teachers in Abha secondary schools that could be attributable to characteristics (gender and years of experience)

The decisive kingdom from soft to hard power

This is a political science thesis that traces a transition in the foreign policy of the kingdom of Saudi Arabia from reliance on soft power to reliance on hard power in cases where the Saudi state is in confrontation with Iran. In theory, the research contextualizes this transition based on Joseph Nye’s concepts of soft and hard power. The thesis uses case analysis approach to manifest the transition in reading and analyzing six cases based on one major hypothesis that measures Iran threat as prominent in those cases. It concludes that since 2010, Saudi Arabia foreign policy began to shift toward using hard power to confront Iran at different states using two different forms of hard power

3,4-Dimethyl-N-[(E)-3-nitro­benzyl­idene]-1,2-oxazol-5-amine

In the title compound, C12H11N3O3, the dihedral angle between the 3-nitro­benzaldehyde and 5-amino-3,4-dimethyl-1,2-oxazole moieties is 2.46 (12)°. The mol­ecule is close to planar, the r.m.s. deviation for the non-H atoms being 0.028 Å. The packing only features van der Waals inter­actions between the mol­ecules

(2E)-3-[4-(Dimethyl­amino)­phen­yl]-1-(2,5-dimethyl-3-thien­yl)prop-2-en-1-one

The asymmetric unit of the title compound, C17H19NOS, contains two independent mol­ecules which differ in the dihedral angles between the five- and six-membered rings [12.52 (10) and 4.63 (11)°]. Weak inter­molecular C—H⋯O hydrogen bonds link the two independent mol­ecules into pseudocentrosymmetric dimers. In one mol­ecule, the O atom of the carbonyl group is disordered over two positions in a 0.699 (4):0.301 (4) ratio

6-Amino-5-(1-amino-2,2-dicyano­vin­yl)-3,3a,4,5-tetra­hydro-2H-indene-4-spiro-1′-cyclo­pentane-3a,7-dicarbonitrile–thio­phene-2-carbaldehyde (1/0.5)

In each of the two independent indene-4-spiro­pentane mol­ecules in the asymmetric unit of the title 2:1 adduct, C19H18N6·0.5C5H4OS, the cyclo­hexene ring adopts a half-chair conformation and the cyclo­pentene and cyclo­pentane rings adopt envelope conformations. The mean plane through the cyclo­hexene/cyclo­pentene fused system is aligned at a dihedral angle of 77.9 (1)° with respect to the mean plane through the cyclo­pentane ring in one mol­ecule and 87.0 (1)° in the other. In the crystal, adjacent indene-4-spiro­pentane mol­ecules are linked by N—H⋯N hydrogen bonds into a three-dimensional network. The spaces within the network are occupied by the thio­phene-2-carbaldehyde mol­ecules. The thio­phene-2-carbaldehyde unit is disordered over two positions of equal occupancy. The crystal studied was found to be a non-morohedral twin with two minor twin components of 18.4 and 9.7%