Stress, dependency, and depression: An examination of the reinforcement effects of problematic smartphone use on perceived stress and later depression

Problematic Smartphone Use (PSU) is associated with a series of mental health issues including depression; yet, the directionality and underlying mechanisms for these associations are underdetermined. This study investigated the possible reinforcement effects of PSU on perceived stress and later depression and the moderating effect of social support on the associations between perceived stress and smartphone use and PSU. This study further explored the differential effects for separate types of smartphone use. With a sample of 222 college students, we found that PSU reinforced perceived stress especially for people with high levels of stress, and perceived stress fully mediated the association between PSU and depression. Regarding types of smartphone use, we found that perceived stress was associated with both person-to-person and social networking smartphone use. In addition, for people with low to medium levels of social support, perceived stress was linked to increased PSU via social networking smartphone use.

Rheological Properties of Composite Polymer Liner Based on Hydroxyl‐Terminated Polybutadiene

An experimental study to determine the dependence of the viscosity and shear stress of hydroxyl-terminated polybutadiene (HTPB) and dimeryl diisocyanate (DII) liner on curing time is presented. Viscosity and shear-stress were measured by HAAKE RheoStress 600 rheometer with parallel disks configuration at a constant temperature of 65 °C. The viscosity and shear-stress change were monitored for 8 h. Analysis of data showed that the liner viscosity and shear-stress dependency on time matched to pseudoplastic fluid model. For low shear-rates, the viscosity build-up is highest, with the logarithm of the viscosity being practically linear with time and the viscosity increases by more than two orders of magnitude for these cases. When the shear rates increase, the viscosity build-up slows down considerably with time and the viscosity is increased only by one order of magnitude.

Creep and consolidation of a stiff clay under saturated and unsaturated conditions

In this paper, the one-dimensional (1D) time-dependent behaviour of natural and reconstituted London Clay samples under saturated and unsaturated conditions is studied. For this purpose, a set of 1D consolidation tests including multi-staged loading (MSL) oedometer tests and single-staged loading (SSL) long-term oedometer creep tests were carried out on saturated and unsaturated specimens. Conventional oedometer cells were used for tests on saturated specimens, whereas a newly designed unsaturated oedometer cell, equipped with two high-capacity tensiometers (HCTs) for suction measurements, was used for unsaturated tests. The tests results revealed stress dependency and suction dependency of primary and secondary consolidation responses of the soil samples. Furthermore, counter to formerly acknowledged suggestions of independency of the slope of normal consolidation line to suction changes, it was observed that an increase in suction results in a decrease of the slope of compression curve (Cc) and the creep index (Cαe) values and an increase in yield vertical net stress (σp). Moreover, the Cαe/Cc ratio for London Clay was found to be stress- and suction-dependent, unlike the previously suggested hypotheses.

Moderate Step Over Sensitive Move Towards Mental Stress

Data classification study is applied in a profound manner to find some statistical classifier to analyze the higher order and lower order priors, like a hood to perform the posterior using Bayesian classifiers. The rough set approaches planned with functional and to determine the existence of the attribute with the level to correlation among them. Approximations towards the set of some logical factors were filtered towards to detect the mental stress through data collection mainly from the working people sector. Significant analyses to quantify the features of mental stress in various diseases cataloging manner with its technical aspects with its classification types based on the class value. As a proposed system of suggested hypothesis planned to predict the classifier model to reduce the stress dependency for the working people as much as possible in a smoother way.

Moderate Step Over Sensitive Move Towards Mental Stress

Data classification study is applied in a profound manner to find some statistical classifier to analyze the higher order and lower order priors, like a hood to perform the posterior using Bayesian classifiers. The rough set approaches planned with functional and to determine the existence of the attribute with the level to correlation among them. Approximations towards the set of some logical factors were filtered towards to detect the mental stress through data collection mainly from the working people sector. Significant analyses to quantify the features of mental stress in various diseases cataloging manner with its technical aspects with its classification types based on the class value. As a proposed system of suggested hypothesis planned to predict the classifier model to reduce the stress dependency for the working people as much as possible in a smoother way