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1.
《Information processing & management》2022,59(6):103064
Occupational stress has a significant adverse effect on workers’ well-being, productivity, and performance and is becoming a major concern for both individual companies and the overall economy. To reduce negative consequences, early detection of stress is a key factor. In response several stress prediction methods have been proposed, whose primary aim is to analyse physiological and behavioural data. However, evidence suggests that solutions based on physiological and behavioural data alone might be challenging when implemented in real-world settings. These solutions are sensitive to data problems arising from losses in signal quality or alterations in body responses, which are common in everyday activities. The contagious nature of stress and its sensitivity to the surroundings can be used to improve these methods. In this study, we sought to investigate automatic stress prediction using both surrounding stress data, which we define as close colleagues’ stress levels and the stress level history of the individuals. We introduce a real-life, unconstrained study conducted with 30 workers monitored over 8 weeks. Furthermore, we propose a method to investigate the effect of stress levels of close colleagues on the prediction of an individual’s stress levels. Our method is also validated on an external, independent dataset. Our results show that surrounding stress can be used to improve stress prediction in the workplace, where we achieve 80% of F-score in predicting individuals’ stress levels from the surrounding stress data in a multiclass stress classification. 相似文献
2.
Yu Chen 《Journal of The Franklin Institute》1975,300(3):185-191
The dynamic radial stress distribution in a circular hollow cylinder, bonded to a rigid core at its inner surface and prevented from outward displacement by a smooth rigid cylindrical wall, due to a rotational motion with a variable angular velocity, is analyzed.The stress as a function of radial distance and time is determined. A sample calculation shows that the stress changes from tension at the inner surface to compression at the outer surface, as would be expected. The variation of stress vs radial distance is plotted for several instants of time. Also, the stress vs time for various radial positions is plotted. 相似文献
3.
Fluid shear stress (FSS) plays a critical role in regulating endothelium function and maintaining vascular homeostasis. Current microfluidic devices for studying FSS effects on cells either separate high shear stress zone and low shear stress zone into different culturing chambers, or arranging the zones serially along the flow direction, which complicates subsequent data interpretation. In this paper, we report a diamond shaped microfluidic shear device where the high shear stress zone and the low shear stress zone are arranged in parallel within one culturing chamber. Since the zones with different shear stress magnitudes are aligned normal to the flow direction, the cells in one stress group are not substantially affected by the flow-induced cytokine/chemokine releases by cells in the other group. Cell loading experiments using human umbilical vein endothelial cells show that the device is able to reveal stress magnitude-dependent and loading duration-dependent cell responses. The co-existence of shear stress zones with varied magnitudes within the same culturing chamber not only ensures that all the cells are subject to the identical culturing conditions, but also allows the resemblance of the differential shear stress pattern in natural arterial conditions. The device is expected to provide a new solution for studying the effects of heterogeneous hemodynamic patterns in the onset and progression of various vascular diseases. 相似文献
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知识员工是企业赖以生存和发展的宝贵财富。随着知识老化速度日益加快,知识更新成为知识员工普遍面临的压力。基于挑战—阻断性压力分类理论和压力交互理论,探讨知识更新要求对女性知识员工创造力的影响,分析了挑战性压力评估和个体技能发展的链式中介作用和工作家庭冲突的调节作用。运用结构方程模型和Bootstrapping方法对假设进行检验,结果表明：知识更新要求对员工创造力有显著正向影响,包括直接影响和间接影响;在间接影响方面,挑战性压力评估和个体技能发展在知识更新要求与员工创造力关系中起部分链式中介作用;在直接影响方面,工作家庭冲突在知识更新要求与员工创造力关系中起调节作用。 相似文献
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目的了解高职院校大学生焦虑、心理压力特．点及相互关系,为增进高职生身心健康提供依据。方法采用《中国大学生心理应激量表》（CCSPSS）,《状态特质焦虑问卷》（STAI）对石家庄市763名高职生进行测查。结果高职生状态焦虑水平高于一般人群常模,与心理压力呈正相关,特质焦虑水平无明显差异,与心理压力不存在相关关系。状态、特质焦虑在性别、年级、城乡变量上差异无统计学意义。高职生学习、生活、发展、社交、家庭压力及压力总分低于大学生常模群体,差异均有统计学意义（P〈0．01）。女生社交压力高于男生,差异有统计学意义（P〈O05）。农村来源的学生学习压力高于城市来源学生,（P〈0．05）。不同年级在学习、生活、发展、社交及心理压力总分方面差异有统计学意义（P〈0．01）,一年级学习压力最高,二年级总的心理压力和发展压力最高,三年级总的心理压力及各方面压力最低。结论心理压力是状态焦虑的重要相关因素,应针对不同情况,加强高职生学习、社交、生活适应教育,从而缓解心理压力,减轻焦虑。 相似文献
6.
根据杂交应力理性模式，基于一种修正的Hellinger－Reissuer原理，建立了具有一个无外力斜边的杂交应力元，其应力场由无边界面力在非协调位移上所作虚功之和为零的约束条件导出，将这种特殊元与具有一个无外力圆弧边的杂交应力元联合，可有效地分析具有倒圆角V型槽孔板的应力集中，并可提供远较一般假定位移及一般假定应力元准确的孔边应力分布。 相似文献
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近年来,我国旅游企业许多员工因工资收入低、工作任务重、工作枯燥无味、缺乏工作保障和职业发展机会而离职或改行。欧美学者的大量实证研究结果表明,角色压力不仅会降低员工的工作绩效,而且会引起员工的不满情绪,造成员工离职。如何做好员工角色压力管理,是许多旅游企业管理人员面临的一项重要工作。本文探讨角色压力的内涵、组成成分、前因后果,并为企业管理人员加强员工角色压力管理工作提供一些建议。 相似文献
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We report a microfluidic blood-brain barrier model that enables both physiological shear stress and optical transparency throughout the device. Brain endothelial cells grown in an optically transparent membrane-integrated microfluidic device were able to withstand physiological fluid shear stress using a hydrophilized polytetrafluoroethylene nanoporous membrane instead of the more commonly used polyester membrane. A functional three-dimensional microfluidic co-culture model of the neurovascular unit is presented that incorporates astrocytes in a 3D hydrogel and enables physiological shear stress on the membrane-supported endothelial cell layer. 相似文献
10.
河道型水库蓄水诱发地震的数值模拟 总被引：1，自引：0，他引：1
利用二维弹性有限元模型,计算了河道型水库蓄水造成的地应力变化,进而计算了走向平行于水库长轴的不同倾角断层面上库仑应力变化,以此来评价水库蓄水对库区断层稳定性的影响.结果表明,蓄水增加的压应力非常有限;如果背景应力场有利于正断层活动,蓄水可能会导致一定深度和倾角的断层更加危险;如果背景应力场有利于浅表的逆断层活动,蓄水会抑制不同倾角的逆断层活动. 相似文献
11.
E.E. Gdoutos 《Journal of The Franklin Institute》1981,312(5):361-371
An analysis of the plastic enclaves developed around the end points of rigid fiber inclusions embedded in an elastic plate is undertaken. The plate is subjected to a uniform uniaxial stress at any angle of inclination with the axis of the fiber. It is assumed that the material of the plate is elastic-perfectly plastic and that the deformations are small. A singular solution of the stress field in the vicinity of the end points of the fiber is used in conjunction with the Mises yield criterion to obtain the radius of the plastic zone under conditions of plane strain and generalized plane stress. The dependence of the size and shape of the plastic deformation on the orientation of the fiber, the Poisson's ratio of the plate and the state of stress (plane strain or generalized plane stress) is established. 相似文献
12.
综述分子标记在大麦耐非生物胁迫研究中的应用及其研究进展,包括发育基因效应、野生种或地方种的变异、遗传(QTLs)图谱等。现代引种和育种过程引起物种的遗传变异趋于狭窄、多样性减少,由此可能加重疾病、害虫和非生物胁迫等危害的潜在威胁。发育基因对环境胁迫具有较强的多态性效应;野生大麦和原始地方种为提高耐胁迫性提供了丰富的遗传变异资源。大麦遗传多样性的分离鉴定、遗传图谱构建、及数量性状位点(QTL)分析和分子标记辅助选择,将有助于更好地利用野生种质优良抗性,更有效的选择耐(抗)性基因型。文末从正反两方面简要讨论了分子标记在大麦耐非生物胁迫遗传育种研究中作用。 相似文献
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Sutirtha Chakraborty Anindya Dasgupta Harendra Nath Das Om Prakash Singh Asok Kumar Mandal Nikhiles Mandal 《Indian journal of clinical biochemistry : IJCB》2009,24(2):194-197
Oxidative stress has been found to play important role in several neuropsychiatric diseases including Obsessive Compulsive
Disorder. A longitudinal case control study was conducted to evaluate the oxidative stress in 30 newly diagnosed obsessive
compulsive disorder patients and same number of control patients. Serum thiobarbituric acid reacting substances, plasma ascorbate
were assessed to evaluate oxidative stress and Yale Brown obsessive compulsive scale for disease severity before and after
treatment with Fluoxetine at the average dosage of 40 mg/day. Improvement in Yale Brown obsessive compulsive scale score by
about 43% after 12 weeks treatment was associated with significantly decreased thiobarbituric acid reacting substances and
increased plasma ascorbate values (p < 0.05). The newly diagnosed obsessive compulsive disorder patients had higher serum
thiobarbituric acid reacting substances as well as a lower plasma ascorbate levels than the control population. Thus, the
present study suggested a significant role of oxidative stress in obsessive compulsive disorder and showed that a successful
treatment with Fluoxetine not only improves the clinical scenario but also reduces the oxidative stress that may further improve
the prognosis of the disease. 相似文献
14.
Muthuswamy Balasubramanyam Raji Lenin Finny Monickaraj 《Indian journal of clinical biochemistry : IJCB》2010,25(2):111-118
The endoplasmic reticulum (ER) is a cellular compartment responsible for multiple important cellular functions including the
biosynthesis and folding of newly synthesized proteins destined for secretion, such as insulin. A myriad of pathological and
physiological factors perturb ER function and cause dysregulation of ER homeostasis, leading to ER stress. Accumulating evidence
suggests that ER stress plays a role in the pathogenesis of diabetes, contributing to pancreatic β-cell loss and insulin resistance.
ER stress may also link obesity, inflammation and insulin resistance in type 2 diabetes. In this review, we address the transition
from physiology to pathology, namely how and why the physiological UPR evolves to a proapoptotic ER stress response in diabetes
and its complications. Special attention was given to elucidate how ER stress could explain some of the ‘clinical paradoxes’
such as secondary sulfonylurea failure, initial worsening of retinopathy during tight glycemic control, insulin resistance
induced by protease inhibitors and other clinically relevant observations. 相似文献
15.
纤维增强塑料(FRP)与混凝土的粘结性能是混凝土结构外贴FRP板材这一加固技术的重要研究课题。本文通过对混凝土表面粘贴FRP板的单剪搭接接头进行三维有限元模拟,得出了胶和混凝土中在加载端和自由端附近的各应力分量的分布曲线以及FRP板中沿板长度方向的应力分布曲线,从而分析板宽对FRP-混凝土粘结界面应力分布的具体影响,以期为进一步的相关研究提供参考。研究结果表明:(1)沿着板宽度方向应力存在着严重的不均匀性;(2)随着板宽的增加,使得应力沿着板宽的方向渐趋于均匀,因而有利于应力的传递;(3)当宽度比较大时,易发生自由端混凝土的拉剪破坏。 相似文献
16.
Yingying Hu Shiyao Bian John Grotberg Marcel Filoche Joshua White Shuichi Takayama James B. Grotberg 《Biomicrofluidics》2015,9(4)
Fluid dynamics of mucus plug rupture is important to understand mucus clearance in lung airways and potential effects of mucus plug rupture on epithelial cells at lung airway walls. We established a microfluidic model to study mucus plug rupture in a collapsed airway of the 12th generation. Mucus plugs were simulated using Carbopol 940 (C940) gels at concentrations of 0.15%, 0.2%, 0.25%, and 0.3%, which have non-Newtonian properties close to healthy and diseased lung mucus. The airway was modeled with a polydimethylsiloxane microfluidic channel. Plug motion was driven by pressurized air. Global strain rates and shear stress were defined to quantitatively describe plug deformation and rupture. Results show that a plug needs to overcome yield stress before deformation and rupture. The plug takes relatively long time to yield at the high Bingham number. Plug length shortening is the more significant deformation than shearing at gel concentration higher than 0.15%. Although strain rates increase dramatically at rupture, the transient shear stress drops due to the shear-thinning effect of the C940 gels. Dimensionless time-averaged shear stress, Txy, linearly increases from 3.7 to 5.6 times the Bingham number as the Bingham number varies from 0.018 to 0.1. The dimensionless time-averaged shear rate simply equals to Txy/2. In dimension, shear stress magnitude is about one order lower than the pressure drop, and one order higher than yield stress. Mucus with high yield stress leads to high shear stress, and therefore would be more likely to cause epithelial cell damage. Crackling sounds produced with plug rupture might be more detectable for gels with higher concentration. 相似文献
17.
本文利用边界元的数值计算方法(BEM),计算了在不同外部应力作用下材料内部具有不同形态的微裂纹尖端区域的应力场情况和应力集中因子,得出了在不同应力作用条件下微裂纹尖端区域的最大主应力场分布和应力集中因子,并给出了不同应力条件和裂纹形态与应力集中因子的关系。在裂纹尖端这些高应力区内一些与结构畸变有关的效应如原子外层电子能量增加与逃逸现象等是能够发生的。 相似文献
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黄河流域作为中国的“能源流域”,合理有序开发矿产资源、统筹协调矿产资源开发与生态环境保护之间的关系,对于黄河流域能矿经济可持续发展和生态保护具有重要现实意义。本文以黄河流域为研究区,综合运用多指标综合评价法、胁迫耦合分析法和GIS空间分析等方法技术,从生态本底的脆弱程度、对重要生态功能区的空间胁迫性以及对重要生态环境因子的胁迫程度等多个层面,分析了区域矿产资源开发对生态环境的胁迫特征及空间分布,将黄河流域46个矿区城市划分为本底胁迫、生态功能胁迫、开发胁迫、本底+开发胁迫、开发+生态功能胁迫、本底+生态功能胁迫、全面胁迫和无胁迫8种不同类型区,并从生态环境保护的角度提出黄河流域矿产资源开发地区的管控路径：①空间管控：严格限制大规模高强度工业化城镇化开发,尤其是控制矿区的开发边界;②强度管控：针对于生态本底脆弱的地区,强度和总体开发规模的管控要兼而并举;③开发方式管控：注重能矿产业的结构调整与升级,在空间上要注重集中建设,宜矿则矿、宜工则工、宜聚则聚。 相似文献
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为贯彻落实教育部26号令,杭州市内不符合用地面积要求的独立学院纷纷去外地择址,建立新校区。学院的迁建会给教师带来不同程度的应激,产生不利影响。面对迁建,学院应积极管理和控制教师应激。本文将就个人管理和组织管理两个方面对教师的应激管理提出相关建议和方案。 相似文献