scholarly journals Relaxation phenomena of electrical signal emissions from rock following application of abrupt mechanical stress

2012 ◽  
Vol 55 (1) ◽  
Author(s):  
Dimos Triantis ◽  
Filippos Vallianatos ◽  
Ilias Stavrakas ◽  
George Hloupis
Keyword(s):  
Mechanical Stress ◽  
Applied Stress ◽  
Rock Sample ◽  
High Stress ◽  
Electrical Signal ◽  
Relaxation Processes ◽  
Significant Information ◽  
Stress Levels ◽  
High Level ◽  
Clear Information

<p>The emission of electrical signals during application of mechanical stress to brittle geo-materials (the so-called pressure-stimulated current; PSC) can provide significant information regarding the mechanical status of a studied rock sample. PSCs originate as a result of the opening of cracks and microfractures in rock. In this study, such electrical signal emissions are detected and studied when rock samples are subjected to step-wise mechanical stress, increased from low stress levels vL up to higher stress levels vH. This increase is performed at high stress rates and consequently the stress is maintained practically constant for a long period. During this time, the applied stress reaches its maximum value, and the emitted PSC decays gradually and relaxes back to a minimum value. The conducted experiments suggest that the characteristics of the relaxation processes of the PSC depend directly on the high level of the applied stress that is maintained constant after the application of each stress step. Analysis of the macroscopic parameters that characterize the relaxation phenomenon of the PSC provides clear information regarding the proximity of the applied stress to the fracture limit of the rock sample.</p>

scholarly journals Information-Seeking Under Threat: How the Characteristics of Web Searches Changed During the Pandemic

2021 ◽  
Author(s):  
Christopher Kelly ◽  
Bastien Blain ◽  
Tali Sharot
Keyword(s):  
Information Seeking ◽  
High Stress ◽  
Rapid Adaptation ◽  
Web Searches ◽  
Global Event ◽  
Search Volume ◽  
Stress Levels ◽  
High Level ◽  
Google Search ◽  
High Level Feature

Abstract To adjust to novel and threatening environments people seek information. Here, we examine whether and how a threatening global event -–the pandemic– altered the characteristics of the information people sought out online. An analysis of queries submitted to Google search engine revealed that people were more likely to submit queries for information that could guide action (i.e., “How to” and “How do” searches) during the pandemic relative to before, controlling for total search volume. This tendency may have contributed to the rapid adaptation observed in response to the pandemic. Indeed, stress levels reported weekly by 17K individuals predicted the proportion of “How to” and “How do” searches, controlling for COVID-19 related confinement. Markedly, population stress levels were more strongly associated with this high-level feature of web searches than they were with searches for specific terms such as “anxiety” or “stress”. In contrast, COVID-19 related confinement, but not stress levels, was associated with the proportion of “What” and “Why” questions submitted to Google, suggesting that the confinement was related to increased desire for general knowledge. Key results were replicated across two countries (UK and US). The study suggests that in situations of high stress people ask questions that can guide action. An intriguing possibility is that tracking of this feature could be used to monitor population stress levels beyond the pandemic.

scholarly journals Evaluation of the Most Stressful Dental Treatment Procedures of Conservative Dentistry among Polish Dental Students

2021 ◽  
Vol 18 (9) ◽  
pp. 4448
Author(s):  
Katarzyna Mocny-Pachońska ◽  
Rafał J. Doniec ◽  
Sylwia Wójcik ◽  
Szymon Sieciński ◽  
Natalia J. Piaseczna ◽  
...  
Keyword(s):  
Dental Treatment ◽  
High Stress ◽  
Dental Students ◽  
Endodontic Treatment ◽  
Stressful Environment ◽  
Caries Treatment ◽  
Dental Procedures ◽  
Conservative Dentistry ◽  
High Level ◽  
Treatment Procedures

Background: Dental schools are considered to be a very stressful environment; the stress levels of dental students are higher than those of the general population. The aim of this study was to assess the level of stress among dental students while performing specific dental procedures. Methods: A survey was conducted among 257 participants. We used an original questionnaire, which consisted of 14 questions assigned to three categories: I—Diagnosis, II—Caries Treatment, and III—Endodontic Treatment. Each participant marked their perceived level of stress during the performed dental treatment procedures. The scale included values of 0–6, where 0 indicates no stress, while 6 indicates high stress. Results: Third- (p=0.006) and fourth-year (p=0.009) women were characterized by a higher level of perceived stress during dental procedures related to caries treatment. Caries treatment procedures were the most stressful for 18.3% of third-year students, 4.3% of fourth-year students, and 3.2% of fifth-year students. Furthermore, 63.4% of third-year students, 47.3% of fourth-year students, and 17.2% of fifth-year students indicated that they felt a high level of stress when performing endodontic procedures. Conclusion: Third- and fourth-year female students are characterized by a higher level of stress during caries and endodontic treatment procedures. The most stressful treatments for participants were endodontic treatment procedures.

The flow of glass at high stress levels

1970 ◽  
Vol 3 (1) ◽  
pp. 127-147 ◽  
Author(s):  
J.H. Li ◽  
D.R. Uhlmann
Keyword(s):  
High Stress ◽  
Stress Levels

A dynamic source model for the San Fernando earthquake

1978 ◽  
Vol 68 (6) ◽  
pp. 1555-1576
Author(s):  
Michel Bouchon
Keyword(s):  
Fault Plane ◽  
High Stress ◽  
Time History ◽  
High Strength ◽  
High Amplitude ◽  
Tectonic Stress ◽  
Source Model ◽  
Dynamic Crack ◽  
San Fernando ◽  
High Level

abstract We model the San Fernando earthquake as a propagating rupture in a half-space, using for the slip-time-history on the fault plane analytical expressions which approximate the slip functions of dynamic crack models obtained by Das and Aki (1977a, b). We synthesize the strong ground motions and accelerations at the Pacoima Dam site and compute the teleseismic signals for different models of cracks. Three major featuras of the data–the strong pulse associated with the beginning of the rupture, the high acceleration phase on the Pacoima Dam records, and the presence of ripples on the teleseismic seismograms–which are not compatible with a smooth rupture process, are well explained by a crack with barriers model where the rupture encounters, along the fault plane, barriers or obstacles of high strength materials which may remain unbroken after the passage of the rupture front. A high-stress drop (400 to 500 bars) is required in the hypocentral area to explain the high-amplitude short-duration first pulse of the teleseismic records. This indicates a high level of tectonic stress in the area. A study of the earthquake series following the main shock shows that the aftershocks which took place in the region where major slipping occurred during the earthquake may represent the release of some of the barriers.

Airway smooth muscle tone modulates mechanically induced cytoskeletal stiffening and remodeling

2005 ◽  
Vol 99 (2) ◽  
pp. 634-641 ◽  
Author(s):  
Linhong Deng ◽  
Nigel J. Fairbank ◽  
Darren J. Cole ◽  
Jeffrey J. Fredberg ◽  
Geoffrey N. Maksym
Keyword(s):  
Smooth Muscle ◽  
Mechanical Stress ◽  
Applied Stress ◽  
Airway Smooth Muscle ◽  
Cell Activation ◽  
Structural Changes ◽  
Muscle Tone ◽  
Residual Effects ◽  
Cell Stiffness ◽  
Functional Changes

The application of mechanical stresses to the airway smooth muscle (ASM) cell causes time-dependent cytoskeletal stiffening and remodeling (Deng L, Fairbank NJ, Fabry B, Smith PG, and Maksym GN. Am J Physiol Cell Physiol 287: C440–C448, 2004). We investigated here the extent to which these behaviors are modulated by the state of cell activation (tone). Localized mechanical stress was applied to the ASM cell in culture via oscillating beads (4.5 μm) that were tightly bound to the actin cytoskeleton (CSK). Tone was reduced from baseline level using a panel of relaxant agonists (10−3 M dibutyryl cAMP, 10−4 M forskolin, or 10−6 M formoterol). To assess functional changes, we measured cell stiffness (G′) using optical magnetic twisting cytometry, and to assess structural changes of the CSK we measured actin accumulation in the neighborhood of the bead. Applied mechanical stress caused a twofold increase in G′ at 120 min. After cessation of applied stress, G′ diminished only 24 ± 6% (mean ± SE) at 1 h, leaving substantial residual effects that were largely irreversible. However, applied stress-induced stiffening could be prevented by ablation of tone. Ablation of tone also inhibited the amount of actin accumulation induced by applied mechanical stress ( P < 0.05). Thus the greater the contractile tone, the greater was applied stress-induced CSK stiffening and remodeling. As regards pathobiology of asthma, this suggests a maladaptive positive feedback in which tone potentiates ASM remodeling and stiffening that further increases stress and possibly leads to worsening airway function.

scholarly journals Burnout, resilience, and perception of mindfulness programmes among GP trainees: a mixed-methods study

BJGP Open ◽  
2020 ◽  
Vol 4 (3) ◽  
pp. bjgpopen20X101058
Author(s):  
Petra Hanson ◽  
Amy Clarke ◽  
Manuel Villarreal ◽  
Majid Khan ◽  
Jeremy Dale
Keyword(s):  
Mixed Methods ◽  
Focus Groups ◽  
Help Seeking ◽  
High Stress ◽  
Mixed Methods Study ◽  
Mindfulness Practice ◽  
Negative Effects ◽  
High Prevalence ◽  
High Level ◽  
And Coping

BackgroundTrainee GPs are at risk of developing burnout as a result of high stress levels. Improving resilience may prevent the negative effects of stress on wellbeing, morale, and patient care, thereby supporting recruitment to general practice.AimTo explore experiences of stress and burnout among GP trainees, and their level of interest in undertaking a mindfulness programme.Design & settingA qualitative study was performed with a cohort of GP trainees in Coventry and Warwickshire.MethodThis mixed-methods study utilised a survey with validated measures to investigate the prevalence of burnout, state of wellbeing, and resilience in GP trainees. Focus groups were also used to explore experiences of stress and burnout, and perceptions of mindfulness practice.ResultsIn total, 47 (response rate 39%) trainees completed the survey and 14 participated in focus groups. There was a high prevalence of disengagement (n = 36; 80%) and emotional exhaustion (n = 35; 77%), with 29 (64%) scoring above the cut-off value for both. While 16 (34%) reported already practising mindfulness, 39 (83%) described interest in engaging in mindfulness practice. The focus groups identified a range of issues relating to how trainees recognise stress and burnout, their help-seeking and coping strategies, the perceived barriers to practising self-care, and motivations for participating in mindfulness training.ConclusionThis study confirms the degree of stress and burnout that GP trainees experience, and their desire for greater wellbeing and resilience support. It identified a high level of interest in attending a mindfulness programme, but also barriers to engagement. Results of this research shaped the Mindful Practice Curriculum programme, which was later provided to this cohort of trainees.

scholarly journals Occupational Stress and Job Burnout among Primary and Secondary School Teachers in Cuttack, Orissa, 2013

2017 ◽  
Vol 5 (1) ◽  
Author(s):  
Joyce Mathews
Keyword(s):  
Occupational Stress ◽  
Secondary School Teachers ◽  
Demographic Data ◽  
High Stress ◽  
Job Burnout ◽  
Stress Index ◽  
Stress Levels ◽  
Older Teachers ◽  
The Relationship ◽  
Primary And Secondary School

The purpose of this study was to explore the levels of occupational stress and job burnout among teachers working in primary and secondary schools and identify the relationship between the selected demographic data with the stress levels. The sample consisted of 100 teachers from 4 schools in Cuttack, Orissa. The instruments used to measure the variables were: 1.Headington Stress Index questionnaire, 2.Headingtacon Burnout Inventory, 3. Self care and Lifestyle Balance Inventory. The statistical techniques of descriptive statistics, ANOVA analysis and Pearson’s coefficient were employed to analyze the data. The findings of the study indicated that a major portion of the teachers’ population faced moderately low stress and burnout, and the remaining faced moderately high stress and burnout. Younger teachers are reported to have more stress than the older teachers. Higher the burnout among teachers, lower was the lifestyle balance among them. Experience, gender and grade did not affect the stress levels among teachers.

scholarly journals Psychological Impact of COVID-19 Pandemic on Healthcare Workers in Riyadh, Saudi Arabia: Perceived Stress Scale Measures

2021 ◽  
Vol 11 (4) ◽  
pp. 377-388
Author(s):  
Nuha Alwaqdani ◽  
Hala A. Amer ◽  
Reem Alwaqdani ◽  
Fahad AlMansour ◽  
Hind A. Alzoman ◽  
...  
Keyword(s):  
Saudi Arabia ◽  
Perceived Stress ◽  
Online Survey ◽  
High Stress ◽  
Post Traumatic Stress ◽  
Perceived Stress Scale ◽  
Health Crisis ◽  
Stress Scale ◽  
Increased Risk ◽  
Stress Levels

Abstract Background The COVID-19 pandemic has been stressful and of considerable concern among health care workers (HCWs). Being particularly at increased risk for exposure, HCWs worry about becoming infected as well as infecting co-workers, patients and family members. Such distress and panic may have destructive effects on individuals and may last long after the pandemic situation leading to depression or post-traumatic stress disorder. Therefore, the aim of the current study is to measure and investigate the prevalence of the factors affecting psychological stress during the COVID-19 pandemic among HCWs. Methods A self-administered online survey—including perceived stress scale (PSS) questions—was disseminated among HCWs in Riyadh, Saudi Arabia (SA) between1st June and 30th July 2020. Results A total of 469 HCWs responded to the survey for a high response rate (93.8%). The PSS revealed that 15.8% of the respondents were suffering from high stress levels, 77.2% were suffering from moderate stress levels and 7% with low stress levels. Females and junior frontline staff reported more severe stress levels. Participation on the pandemic team shows significant impact on stress levels. Conclusion COVID-19 pandemic has increased stress levels among HCWs and affects their psychological wellbeing. Designing programs promoting HCWs mental health are crucial and emotional and psychological support strategies should be part of every public health crisis management plan.

scholarly journals The major worldwide stress of healthcare professionals during the first wave of the COVID-19 pandemic – the international COVISTRESS survey

PLoS ONE ◽  
2021 ◽  
Vol 16 (10) ◽  
pp. e0257840
Author(s):  
Sébastien Couarraze ◽  
Louis Delamarre ◽  
Fouad Marhar ◽  
Binh Quach ◽  
Jiao Jiao ◽  
...  
Keyword(s):  
Healthcare Workers ◽  
Protective Factor ◽  
Healthcare Professionals ◽  
High Stress ◽  
Medical Doctors ◽  
Health Crisis ◽  
Paramedical Staff ◽  
Increased Risk ◽  
Stress Levels ◽  
Very High

Introduction The COVID-19 pandemic has initiated an upheaval in society and has been the cause of considerable stress during this period. Healthcare professionals have been on the front line during this health crisis, particularly paramedical staff. The aim of this study was to assess the high level of stress of healthcare workers during the first wave of the pandemic. Materials and methods The COVISTRESS international study is a questionnaire disseminated online collecting demographic and stress-related data over the globe, during the pandemic. Stress levels were evaluated using non-calibrated visual analog scale, from 0 (no stress) to 100 (maximal stress). Results Among the 13,537 individuals from 44 countries who completed the survey from January to June 2020, we included 10,051 workers (including 1379 healthcare workers, 631 medical doctors and 748 paramedical staff). The stress levels during the first wave of the pandemic were 57.8 ± 33 in the whole cohort, 65.3 ± 29.1 in medical doctors, and 73.6 ± 27.7 in paramedical staff. Healthcare professionals and especially paramedical staff had the highest levels of stress (p < 0.001 vs non-healthcare workers). Across all occupational categories, women had systematically significantly higher levels of work-related stress than men (p < 0.001). There was a negative correlation between age and stress level (r = -0.098, p < 0.001). Healthcare professionals demonstrated an increased risk of very-high stress levels (>80) compared to other workers (OR = 2.13, 95% CI 1.87–2.41). Paramedical staff risk for very-high levels of stress was higher than doctors’ (1.88, 1.50–2.34). The risk of high levels of stress also increased in women (1.83, 1.61–2.09; p < 0.001 vs. men) and in people aged <50 (1.45, 1.26–1.66; p < 0.001 vs. aged >50). Conclusions The first wave of the pandemic was a major stressful event for healthcare workers, especially paramedical staff. Among individuals, women were the most at risk while age was a protective factor.

scholarly journals The effect of Health Literacy on COVID-19 Vaccine Hesitancy: The Moderating Role of Stress

2021 ◽  
Author(s):  
Fan Zhang ◽  
Huiqiao Zhang ◽  
Yue Li ◽  
Sihui Peng ◽  
Yue Jiang ◽  
...  
Keyword(s):  
Health Literacy ◽  
Online Survey ◽  
High Stress ◽  
Vaccine Hesitancy ◽  
The People ◽  
Different Populations ◽  
Promotion Strategies ◽  
High Level ◽  
Moderating Role

Abstract Background The COVID-19 vaccine is an essential means to establish group immunity and prevent the spread of the pandemic. However, the public's hesitation has created major difficulties to the promotion of the vaccine. By investigating the relationship between health literacy and COVID-19 vaccine hesitancy, as well as the potential moderating role of stress, the present study would provide critical insights for tailoring vaccine-promotion strategies. Objective The two-fold research purpose is: i) address the effect of health literacy on people's attitude toward COVID-19 vaccine, ii) clarify the role of stress in this effect. Method With structured questionnaires, an online survey was conducted to evaluate general public's COVID-19 vaccine hesitancy, health literacy, and perceived stress. In total, 560 responses were collected, and moderated regression analysis was conducted to test the effect of health literacy on vaccine hesitancy among people with different levels of stress. Results A total of 560 participants aged over 18 years were included in this study. About 39.8% of the respondents reported vaccine hesitancy, and this rate is higher among those aged 20-30 years old (83%) and female (71.3%). The results showed people with higher level of health literacy are less likely to have vaccine hesitancy . However, this effect was only among those with lower to moderate level of stress , among the people with high stress, no significant effect of health literacy was found . Conclusions By focusing on the effect of health literacy on COVID-19 vaccine hesitancy, the findings showed education program increasing individual's health literacy may also effectively reduce the public's vaccine hesitancy and promote accepting attitude. However, for people with high level of stress, other health programs need to be developed to enhance their positive attitude toward the COVID-19 vaccine. In conclusion, promotion strategies should be tailored for different populations, with considering individual factors such as health literacy and stress. Keywords vaccine hesitancy; health literacy; stress; moderation

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