scholarly journals Improving the Axial Compliance Coefficient of the Threaded Element of Releasable Connection

2016 ◽  
Vol 22 (4) ◽  
pp. 674-678
Author(s):  
V. D. Prodan ◽  
◽  
G. V. Bozhko ◽  
A. V. Vasilyev ◽  
M. S. Fokina ◽  
...  
Keyword(s):  
Compliance Coefficient

scholarly journals Infinite Kirchhoff plate on a compact elastic foundation may have arbitrary small eigenvalue

2019 ◽  
Vol 488 (4) ◽  
pp. 362-366
Author(s):  
S. A. Nazarov
Keyword(s):  
Continuous Spectrum ◽  
Neumann Problem ◽  
Elastic Foundation ◽  
Laplace Operator ◽  
Small Eigenvalue ◽  
Winkler Foundation ◽  
Infinite Strip ◽  
Compliance Coefficient ◽  
Strip Waveguide ◽  
The Laplace Operator

An inhomogeneous Kirhhoff plate composed from semi-infinite strip-waveguide and a compaсt resonator which is in contact with the Winkler foundation of small compliance, is considered. It is shown that for any 0, it is possible to find the compliance coefficient O(2) such that the described plate possesses the eigenvalue 4embedded into continuous spectrum. This result is quite surprising because in an acoustic waveguide (the spectral Neumann problem for the Laplace operator) a small eigenvalue does not exist for any unsubstantial perturbation. A reason of this dissension is explained as well.

Poziom wiedzy i nawyki personelu jako czynniki wpływające na poprawność realizacji higieny rąk w obszarze medycznym

2020 ◽  
Vol 11 (6) ◽  
pp. 301-306
Author(s):  
Małgorzata Cichońska ◽  
Dorota Maciąg
Keyword(s):  
Hand Hygiene ◽  
Healthcare Workers ◽  
Medical Personnel ◽  
Healthcare Services ◽  
Routine Care ◽  
Healthcare Personnel ◽  
Hygiene Practices ◽  
Compliance Coefficient ◽  
Correct Technique ◽  
Healthcare Associated

Hand hygiene continues to be the most important part of the strategy to combat healthcare associated infections and the first step in reducing them. Hand hygiene procedures are fully performed by less than half of healthcare workers and research confirms a low compliance coefficient for hygiene (at the level of 1.4–6). The list of factors influencing the adherence to hand hygiene routine protocols (as per WHO guidelines) includes factors related to poor hand hygiene practices, poor hand hygiene practices reported by staff and additional perceived obstacles to good hand hygiene. The following are the barriers and reasons why healthcare workers do not sufficiently adhere to the correct technique of washing and disinfecting hands: forgetting to perform this procedure, excessive workload, haste during routine care activities, lack of a pattern of behavior among other employees and superiors, lack of habits, as well as a shortage of disinfectants and disposable towels in patient rooms, or irritation of the skin of the hands caused by the disinfectant. To sum up, it can be concluded that hand hygiene is and will be an issue that requires continuous action and permanent education of healthcare personnel and recipients of healthcare services. The list of factors causing poor hand hygiene is quite long. It includes, among others, the level of knowledge and habits of medical personnel and requires constant updating, as in the place of confirmed and verified reasons for low rates, newer ones which are specific for the current situation, will appear.

Elasticity of Small Pulmonary Veins in the Cat

1981 ◽  
Vol 103 (1) ◽  
pp. 38-42 ◽  
Author(s):  
R. T. Yen ◽  
L. Foppiano
Keyword(s):  
Venous Pressure ◽  
Pulmonary Veins ◽  
Air Pressure ◽  
Pleural Pressure ◽  
Lung Inflation ◽  
Alveolar Air ◽  
Compliance Coefficient

The distensibility of pulmonary veins of cats, in the diametric range of 100–1200 μm, was studied as a function of the venous pressure pv and pleural pressure pPL, while the alveolar air pressure was maintained at zero (atmospheric). The resulting percentage changes in diameter normalized with respect to the diameter at ΔP of 10 cm H2O (D10) are expressed as function of ΔP = pv − pPL. It was found that in most cases the diameter varies linearly with ΔP: D/D10=1+α(pv−pPL) where α is the compliance coefficient. The results show that smaller veins of the cat are more compliant than larger veins. For example, when pleural pressure is −10 cm H2O, the values of α for vessels in the ranges of diameters of 100–200 μm, 200–400 μm, 400–800 μm and 800–1200 μm are, respectively, 2.05, 1.44, 1.08 and 0.71 percent per cm H2O or Pa−1. The effects of lung inflation on the distensibility of pulmonary veins are also studied. Our results show that for vessel sizes in the range of 400–800 μm and 800–1200 μm the compliance constant α is not affected by inflation of the lungs (changes in pleural pressure to more negative values). For smaller veins in the size ranges 100–200 μm and 200–400 μm our results show an increase in compliance from 2.05 to 2.79 and from 1.44 to 2.01 percent per cm H2O or Pa−1, respectively, when pleural pressure is changed from −10 to −15 cm H2O. When the pleural pressure is more negative than −15 cm H2O, however, the compliance of the vessels in the foregoing two size ranges is observed to decrease.

Elasticity of arterioles and venules in postmortem human lungs

1988 ◽  
Vol 64 (2) ◽  
pp. 611-619 ◽  
Author(s):  
R. T. Yen ◽  
S. S. Sobin
Keyword(s):  
Blood Vessels ◽  
Vascular System ◽  
Vessel Diameter ◽  
Transmural Pressure ◽  
Formaldehyde Solution ◽  
Branching Order ◽  
Human Lungs ◽  
Compliance Coefficient ◽  
Vascular Elasticity ◽  
Different Levels

The elasticity and branching order of noncapillary microscopic blood vessels less than 100 microns diam were studied in human lungs obtained 7–30 h postmortem, using a silicone elastomer method that selectively filled pulmonary arterioles or venules. The lungs were inflated to 10 cmH2O pressure and a gradient of transmural vascular pressure of 0–17 cm H2O, from lobe base to apex, was established in the silicone-filled vascular system. Histological materials were obtained after airway fixation by formaldehyde solution and analyzed for vessel diameter in the branching order of 1, 2, and 3, with the smallest noncapillary vessel designated as order 1, in accord with the Strahler system. The change in vessel diameter within a branching order at different levels of transmural pressure is a derived measure of vascular elasticity expressed as compliance coefficient alpha, alpha Values are 0.128, 0.164, and 0.210 micron/cmH2O or 0.682, 0.472, and 0.354%/cmH2O, respectively, of orders 1–3 for arterioles and 0.187, 0.215, and 0.250 micron/cmH2O or 0.992, 0.612, and 0.424%/cmH2O, respectively, of orders 1–3 for venules. The percent is normalized with D0, which is the value of diameter (D) when the transmural pressure is zero. These data are compared with those for the cat where alpha = 0.274 for similar juxta-alveolar vessels.

scholarly journals Photoelastic Properties of Trigonal Crystals

Crystals ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1095
Author(s):  
Bohdan Mytsyk ◽  
Nataliya Demyanyshyn ◽  
Anatoliy Andrushchak ◽  
Oleh Buryy
Keyword(s):  
Elastic Stiffness ◽  
Interferometric Method ◽  
Absolute Value ◽  
Interferometric Technique ◽  
Stiffness Coefficients ◽  
Half Wave ◽  
Compliance Coefficient ◽  
The Matrix ◽  
The Absolute ◽  
The Right

All possible experimental geometries of the piezo-optic effect in crystals of trigonal symmetry are studied in detail through the interferometric technique, and the corresponding expressions for the calculation of piezo-optic coefficients (POCs) πim and some sums of πim based on experimental data obtained from the samples of direct and X/45°-cuts are given. The reliability of the values of POCs is proven by the convergence of πim obtained from different experimental geometries as well as by the convergence of some sums of POCs. Because both the signs and the absolute values of POCs π14 and π41 are defined by the choice of the right crystal-physics coordinate system, we here use the system whereby the condition S14 > 0 is fulfilled (S14 is an elastic compliance coefficient). The absolute value and the sign of S14 are determined by piezo-optic interferometric method from two experimental geometries. The errors of POCs are calculated as mean square values of the errors of the half-wave stresses and the elastic term. All components of the matrix of elasto-optic coefficients pin are calculated based on POCs and elastic stiffness coefficients. The technique is tested on LiTaO3 crystal. The obtained results are compared with the corresponding data for trigonal LiNbO3 and Ca3TaGa3Si2O14 crystals.

scholarly journals Development of the School Events Locus of Control Scale

1970 ◽  
Vol 15 (1) ◽  
pp. 247-265
Author(s):  
Joanna Poziemska
Keyword(s):  
Locus Of Control ◽  
Learned Helplessness ◽  
Self Esteem ◽  
Second Graders ◽  
Economic Conditions ◽  
Control Scale ◽  
Compliance Coefficient ◽  
School Events ◽  
Account Due ◽  
The Relationship

Many studies have shown that the activity of individuals depends, among others, on constructs such as self-efficacy, self-esteem, motivation, learned helplessness or relations with the environment. They are in turn closely related to the locus of control. As it takes shape under the influence of experiences, past events are important in this process, for students – school events in particular must be taken into account. Due to the fact that tools are missing that could be used by paedagogues to study and diagnose the locus of control of school events in pupils, an attempt has been made to construct it. Existing tools are constructed in other cultures or socio-economic conditions, so this research is an attempt to construct a tool to determine the direction of explaining school events, separately for successes and failures. The sample consisted of 449 second graders from schools above the lower secondary level. The reliability of the tool was verified by the internal compliance coefficient and the validity – by studying the relationship with the chosen variables. The tool can be considered validated. In terms of the failures scale, the tool achieved satisfactory reliability, while the in terms of the scale of success – it needs more development.

scholarly journals AORTIC ELASTICITY AND ENDOTHELIUM MOTOVASCULAR FUNCTION IN PRIMARY HYPOTHYROIDISM

2013 ◽  
Vol 19 (3) ◽  
pp. 242-247
Author(s):  
E. S. Mazur ◽  
D. V. Kileinikov ◽  
D. G. Semenychev ◽  
V. V. Mazur ◽  
T. Yu. Timeshova
Keyword(s):  
Confidence Interval ◽  
Pulse Wave Velocity ◽  
Endothelial Function ◽  
Pulse Wave ◽  
Primary Hypothyroidism ◽  
Mean Values ◽  
Aortic Elasticity ◽  
Compliance Coefficient ◽  
Design And Methods ◽  
Concomitant Hypertension

Objective.To compare aortic elasticity and vasomotor endothelial function in hypertensive and normotensive patients with decompensated primary hypothyroidism (PHT) and after medical compensation. Design and methods. 41 women with PHT were examined, 23 (56 %) subjects had concomitant hypertension. Elasticity of aorta was evaluated by compliance coefficient (CC) and pulse wave velocity (PWV), state of vasomotor endothelial function — by vasodilatation coefficient (VDC). Patients were examined twice: during decompensation and after medical compensation.Results. Mean values of CC in patients with decompensated PHT were 2,27 (95 % confidence interval 1,53–3,01) and 2,23 (1,78–2,67) mm2/mm Hg in hypertensives and normotensive, respectively, PWV — 12,2 (10,4–13,9) and 12,9 (11,8–14,0) m/s, VDC — 4,51 (2,91–6,11) and 3,72 (2,06–5,37) CU, respectively (all p > 0,05). Compensation of PHT led to the CC increase up to 4,69 (4,13–5,24) and 4,66 (3,96–5,36) mm2/mm Hg, PWV patients till 8,85 (6,77–10,9) and 7,40 (6,68–8,11) m/s, VDC increase up to 10,7 (9,27–12,2) and 8,94 (7,81–10,1) CU (all p < 0,05).Conclusion. Compensation of PHT is accompanied by improvement of aortic elasticity and vasomotor endothelial function. There are no differences in aortic elasticity and vasomotor endothelial function in hypertensive and normotensive patients during decompensation and after euthyroid state achievement. 

scholarly journals Response of structure models to sinusoidal dynamic action

2020 ◽  
Vol 224 ◽  
pp. 01005
Author(s):  
E.E. Yurchenko ◽  
E.A. Yurchenko ◽  
A.A. Kakosyan ◽  
L.U. Ovchinnikova ◽  
V.E. Yurchenko ◽  
...  
Keyword(s):  
Narrow Band ◽  
Experimental System ◽  
Dynamic Compliance ◽  
Laboratory Setup ◽  
Amplification Method ◽  
Sea Sand ◽  
Compliance Coefficient ◽  
Resonance Frequencies ◽  
Frequency Generator ◽  
Support Conditions

The use of small-sized models of structures printed on 3-D printers is possible due to the electroelastic properties of ABS plastic. A comparison of their reactions with analogs made of plexiglas, used in studies of concrete structures, was made. The influence of the environment - water or sea sand, support conditions - free support or pinching, shape - simple or complex in planon the response of models from two different materials was investigated. The laboratory setup simulated a dynamic sinusoidal effect using: a digital frequency generator from 1 to 10000 Hz, an acoustic system diffuser, a microphone amplifier, two electrodes, and a computer in a two-channel oscilloscope mode. The vibration characteristics at the base and top of the models were recorded. The experimental system turned out to be sensitive to the shape, methods of fastening elements, the structure as a whole, and the medium of wave propagation. The response was analyzed in terms of the dynamic compliance coefficient and resonance frequencies, reflecting the similarity of the responses of the plexiglas and ABS models. Printing will allow you to adjust the shape and connections of the elements of the models so that they work like mechanical resonators – filters - in a narrow band. No resonances are expected outside this band. In the operated structures, the quality of the element connections is reproduced. Changing the existing rigidity to obtain resonances in a narrow band can serve as a criterion for choosing an effective amplification method.

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