End-of-Life Care Factors Predict Affective Sequences in Older Adults’ Final Memories of Spousal Loss

Memories from the dying days of a deceased spouse are vividly recalled and can guide grief adjustment in older adulthood (Mroz & Bluck, 2018). End-of-life factors (e.g., place of death, quality of death) likely impact the nature of recall of such memories over time. Intersecting psychology and palliative care perspectives, the current study employs mixed-methods to examine relations between end-of-life care factors and affective sequences in older adults’ final memories of spousal loss. Fifty-three participants (Mage = 81.59; M = 6.81 years since loss) completed a Final Memory Interview, provided place of spousal death (in hospital, outside of hospital), and completed the Good Death Inventory (GDI; Miyashita et al., 2008). GDI responses were organized into four quality of death categories. Final memories were reliably content analyzed for affective sequences (i.e., positive and negative affect themes; interrater agreements > .70): redemption (bad mitigated by good, McAdams 1999), contamination (good spoiled by bad; McAdams, 1998), positive stability, and negative stability. Loss of a spouse in hospital, compared to outside of hospital, related to narrating final memories with contamination, F = 4.05, p < .05. Quality of death predicted narration of final memories with positive affective sequences: lower reported comforting environment related to redemption (t = -3.05; p < .01) and higher reported appropriate medical care related to positive stability (t = 2.60; p < .05) in memories. As healthcare provision continues to adjust to improve end-of-life circumstances across care environments, the impact of circumstances on close others should factor into initiative development.

3D Modeling of Stability of Mobile Jack-Up Rigs Under Seismic Impacts

The work is devoted to the study of the influence of external mechanical impacts on the stability of jack-up floating drilling rigs. Ensuring safety when working on jack-up floating drilling rigs (jack-up rigs) is one of the most important tasks at the initial stages of offshore hydrocarbon field development. The aim of the work is simulation of the stability of the rigs, which is in the operating mode, both in the absence of external effects acting on it, and when it is affected by various geodynamic processes. Calculation of jack-up rig stability in sea soil with complex viscoelastoplastic rheology under external mechanical influences was carried out using the finite element method. As a result of the work, the spatial distributions of stress and strain fields were determined both in the jack-up rig itself and in the area of the soil in the vicinity of its supports, in an equilibrium and disturbed state. The results of equilibrium static calculations made it possible to analyze the zones of localization of stresses and deformations in the jack-up rig with respect to stability: the structural elements that are most dangerous from the perspective of stability loss were identified. The analysis of the soil area in the vicinity of the jack-up rig supports made it possible to estimate the typical dimensions of the stress concentration zones arising during the jack-up installation and draw conclusions about the requirements on details and scalability of the model of mechanical properties needed for geomechanical modeling at specific objects. The obtained results of dynamic calculations - the response of theconsidered system to external influences simulating remote seismic processes - made it possible to study the process of loss of jack-up rig stability. The critical values of the parameters describing external influences were determined: in particular, the amplitudes of surface seismic waves leading to the loss of stability of the jack-up rig were found. The obtained results made it possible to formulate an algorithm for predicting seismic hazard during drilling in offshore conditions, based on numerical modeling of mechanical processes at specific locations.

Dynamical phenomena connected with stability loss of equilibria and periodic trajectories

This is a study of a dynamical system depending on a parameter . Under the assumption that the system has a family of equilibrium positions or periodic trajectories smoothly depending on , the focus is on details of stability loss through various bifurcations (Poincaré–Andronov– Hopf, period-doubling, and so on). Two basic formulations of the problem are considered. In the first, is constant and the subject of the analysis is the phenomenon of a soft or hard loss of stability. In the second, varies slowly with time (the case of a dynamic bifurcation). In the simplest situation , where is a small parameter. More generally, may be a solution of a slow differential equation. In the case of a dynamic bifurcation the analysis is mainly focused around the phenomenon of stability loss delay. Bibliography: 88 titles.

Stability Loss Analysis for Thin-Walled Shells with Elliptical Cross-Sectional Area

The aim of the scientific contribution is to point out the possibility of applicability of cylindrical shells with a constant elliptical cross-sectional shape for stability loss analysis. The solution to the problem consists of two approaches. The first approach is the experimental measurement of critical force levels, where the work also describes the method of production of the sample and jigs that cause the desired elliptical shape. The second approach is solving the problem in the use of numerical methods—the finite strip method together with the finite element method.

Study of stability loss of cylindrical shell made of composite material

Introduction. Composite materials are used in the construction of transport infrastructure facilities, buildings and structures for various purposes, in housing and communal services. Calculation of structures made of composite materials is used in the field of stress-strain state, buckling, analysis of material under tension, the effect of cracks on the state of these structures. The main properties of composite materials and a method of manufacturing a cylindrical shell structure from a composite material are considered. The total number of winding options is calculated using the combinatorial method.Materials and methods. A composite cylindrical shell with a radius of R = 300 mm and a height of H = 600 mm was chosen as the object of research. The creation of a model of a cylindrical shell in a finite element analysis package is described. An axial compressive load acting on the shell with a force of F = 100 kN is specified. Determination of the critical force ratio.Results. The results of the analysis of the loss of stability of the cylindrical shell are obtained and the graphs of the dependence of the critical force on the options for laying the layers are presented. Depending on the magnitude of the critical force and the form of buckling, the most and least favorable options for laying layers in a composite material package have been determined.Discussion and conclusions. A conclusion is made of the dependence of the critical force on the combination of stacking layers in the composite.

Sustainable development and industrial enterprises competitiveness increasing in the Barents Euro-Arctic region.

The article considers possibilities for increasing competitiveness of Russian industrial enterprises during the development of resource effective industrial policy. The authors discuss the meaning and interpretation of “sustainable development” and “competitiveness” used in national and international scientific publications. The article traces current trends in the external environment that can contribute to organization's competitive advantages or cause the stability loss. The most significant changes include: the strengthening of industrial policy at national and international levels; broadening the understanding of essence and geographic scope of regulation based on the principles of best available techniques; promoting resource efficient and low-carbon technologies and formulating new international marketing segment for such technologies; establishing approaches for circular economy and links to resource efficient and low-carbon development; developing responsible investment system supporting activities related to meeting sustainable development goals.The authors analyse the basic principles of Environment Social Governance (ESG) and Business Charter for Sustainable Development and demonstrate their impact on the development of new competition rules.The paper presents results of case studies carried out in pulp and paper production and mining industry: environmental and technological modernizationprojects of JSC “Kovdor Mining and Benefication Plant” and JSC “Mondi Syktyvkar” and compares these projects with theESG investment principles. The procedure for excluding Russian installations from the list of environmental “hot spots” of the Barents Euro-Arctic Region is analysed and project assessment results meeting requirements of Best Available Techniques and responsible investment are considered. The paper concludes with the statement that in order to increase the level of international competitiveness of Russian industries it is necessary to take into account sustainable development principles and ESG principles while developing environmental and technological modernization programmes of Russian enterprises.

Fully Inkjet-Printed Biosensors Fabricated with a Highly Stable Ink Based on Carbon Nanotubes and Enzyme-Functionalized Nanoparticles

Enzyme inks can be inkjet printed to fabricate enzymatic biosensors. However, inks containing enzymes present a low shelf life because enzymes in suspension rapidly lose their catalytic activity. Other major problems of printing these inks are the non-specific adsorption of enzymes onto the chamber walls and stability loss during printing as a result of thermal and/or mechanical stress. It is well known that the catalytic activity can be preserved for significantly longer periods of time and to harsher operational conditions when enzymes are immobilized onto adequate surfaces. Therefore, in this work, horseradish peroxidase was covalently immobilized onto silica nanoparticles. Then, the nanoparticles were mixed into an aqueous ink containing single walled carbon nanotubes. Electrodes printed with this specially formulated ink were characterized, and enzyme electrodes were printed. To test the performance of the enzyme electrodes, a complete amperometric hydrogen peroxide biosensor was fabricated by inkjet printing. The electrochemical response of the printed electrodes was evaluated by cyclic voltammetry in solutions containing redox species, such as hexacyanoferrate (III/II) ions or hydroquinone. The response of the enzyme electrodes was studied for the amperometric determination of hydrogen peroxide. Three months after the ink preparation, the printed enzyme electrodes were found to still exhibit similar sensitivity, demonstrating that catalytic activity is preserved in the proposed ink. Thus, enzyme electrodes can be successfully printed employing highly stable formulation using nanoparticles as carriers.

The stability loss of a locally curved double-walled carbon nanotube in visco-elastic matrix

In the current study, stability loss investigation is carried out for a viscoelastic medium containing a double-walled carbon nanotube with local curvature. This research has been carried out using the three dimensional linearized stability theory (TDLTS) within the framework of the piecewise-homogeneous body model. In this case, it is supposed that the carbon nanotube (CNT) has an insignificant initial local defect, and the increase of this defect with the flow of time is examined. Moreover, it is accepted as the criterion for determining the loss of stability that local curvature of the CNT starts to grow indefinitely. The values of the critical time and critical force are obtained from this criterion. In addition, van der Waals forces between the inner surface of the outer tube of the CNT and the outer surface of the inner tube of the CNT were considered. The fractional-exponential Rabotnov operator defines the composite material’s viscoelasticity properties. It is expected that the results obtained from this paper may be a useful guide in applications related to exhibiting the mechanical behavior of the composite material under consideration. Therefore, the effects of viscoelasticity towards composite materials containing a locally curved DWCNT and the limits to be considered in the production of this material are obtained.

The stability of rotating rods under the action of vibro-impact load

The paper presents the investigation results of the vibro-impact loads’ influence on the stability of vibro-drilling machine’ drill-rod in the process of well in hard rock. The drilling process of such wells is significantly facilitated in case of vibro-impact action. The destroying of the rocks during the vibro-rotary drilling occurs via the complex effect of the vibration impulses and rotational motion. In this way, the task of such drill-rod study stability has actuality. In this case, the various modes of vibration and stability loss are possible. In this regard, the study was done by developed software, in which a technique of computer simulation of the oscillating motion of considerable length rotating rods under the action of axial periodic loads is implemented. Such software gives the possibility to model the oscillatory motion of rotating rods and determine the parameters by witch the dynamic stability loss of the studied system can occur. Using this software the diagrams with regions of stable and unstable motion of the rotating rod were drawn for different parameters of the considered system. The process of oscillation is considered in space with account of inertia forces and geometric nonlinearity of the rod. It is shown, that on certain rotational speeds and frequencies of vibro-impact load there are ranges of unstable motion where the run of equipment can inevitably lead to destruction. The obtained results have been analyzed. The conclusion about the possibility of running the equipment in certain frequency ranges is made.