THE DEPENDENCE OF THE COEFFICIENT OF EFFICIENCY (CE) OF THE HEATING INSTALLATION “EFI” UPON THE INITIAL TEMPERATURE OF THE HEAT-CARRYING AGENT

The purpose of the study is to determine the increase in the efficiency of the electrophysical ionization device on a scientific basis, which produces thermal energy based on the regularity of the electrophysical ionization process. This research article discusses the dependence of the amount of thermal energy obtained in the device of electrophysical ionization on temperature. It is noted that if in the case of the traditional method of heating the substance used in the heating industry, the relative heat capacity of the substance is important, then when heated by an unconventional method, in other words, the temperature of the substance is important in the electrophysical ionization device. This indicator, determined on the basis of the experiment, emphasizes the need to apply depending on the correct choice of the physical parameters of the substance the electrophysical ionization method for the efficient production of thermal energy in the heating industry from the heat-carrying substance. Although the heating of water is mainly carried out using various well-known traditional and non-traditional methods, the natural law of heating water is unique. This law notes the dependence of the magnitude of changes in the internal energy of water in a certain volume of heated water and on the speed of movement of this mass. Considering from the point of view of the regularity of the above direction, it is noted that in order to compare the water heated by the traditional method, appropriate calculations have been made.

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Patient’s point of view on the use of telemedicine in multiple sclerosis: a web-based survey

Neurological Sciences ◽

10.1007/s10072-021-05398-6 ◽

2021 ◽

Author(s):

Doriana Landi ◽

Marta Ponzano ◽

Carolina Gabri Nicoletti ◽

Gaia Cola ◽

Gianluca Cecchi ◽

...

Keyword(s):

Multiple Sclerosis ◽

Point Of View ◽

Physical Parameters ◽

Chronic Medical Conditions ◽

Socioeconomic Conditions ◽

Web Based ◽

Healthcare Facilities ◽

Advantages And Disadvantages ◽

Disease Characteristics ◽

Degree Of Disability

AbstractRestrictions in the access to healthcare facilities during COVID-19 pandemic have raised the need for remote monitoring of chronic medical conditions, including multiple sclerosis (MS). In order to enable the continuity of care in these circumstances, many telemedicine applications are currently tested. While physicians’ preferences are commonly investigated, data regarding the patients’ point of view are still lacking. We built a 37 items web-based survey exploring patients’ propensity, awareness, and opinions on telemedicine with the aim to evaluate the sustainability of this approach in MS. Analysing 613 questionnaires out of 1093 that were sent to persons with MS followed at the Multiple Sclerosis Center of Tor Vergata University, Rome, we found that more than half of respondents (54%) were open to having a televisit. Propensity toward telemedicine significantly depended on having a higher income (p = 0.037), living farther from the center (p = 0.038), using computer and tablet (p = 0.010) and using the Internet for other remote activities (p < 0.001), conversely it was not influenced by any specific disease characteristics (i.e. degree of disability). The main advantages and disadvantages of televisit reported by participants were respectively saving time (70%) and impossibility to measure physical parameters (71%). Although the majority of respondents are in favour of televisit, so far this approach is restricted to those displaying better socioeconomic conditions and higher familiarity with technology. Implications of the study are that telemedicine platforms should be better tailored to patients’ demands in order to spread the use of telemedicine, to enhance usability and to increase patients’ adherence.

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Influence of Random Forest Hyperparameterization on Short-Term Runoff Forecasting in an Andean Mountain Catchment

Atmosphere ◽

10.3390/atmos12020238 ◽

2021 ◽

Vol 12 (2) ◽

pp. 238

Author(s):

Pablo Contreras ◽

Johanna Orellana-Alvear ◽

Paul Muñoz ◽

Jörg Bendix ◽

Rolando Célleri

Keyword(s):

Random Forest ◽

Model Performance ◽

Early Warning Systems ◽

Point Of View ◽

Lead Times ◽

Physical Parameters ◽

Runoff Forecasting ◽

Spatio Temporal ◽

Improved Model ◽

Search Approach

The Random Forest (RF) algorithm, a decision-tree-based technique, has become a promising approach for applications addressing runoff forecasting in remote areas. This machine learning approach can overcome the limitations of scarce spatio-temporal data and physical parameters needed for process-based hydrological models. However, the influence of RF hyperparameters is still uncertain and needs to be explored. Therefore, the aim of this study is to analyze the sensitivity of RF runoff forecasting models of varying lead time to the hyperparameters of the algorithm. For this, models were trained by using (a) default and (b) extensive hyperparameter combinations through a grid-search approach that allow reaching the optimal set. Model performances were assessed based on the R2, %Bias, and RMSE metrics. We found that: (i) The most influencing hyperparameter is the number of trees in the forest, however the combination of the depth of the tree and the number of features hyperparameters produced the highest variability-instability on the models. (ii) Hyperparameter optimization significantly improved model performance for higher lead times (12- and 24-h). For instance, the performance of the 12-h forecasting model under default RF hyperparameters improved to R2 = 0.41 after optimization (gain of 0.17). However, for short lead times (4-h) there was no significant model improvement (0.69 < R2 < 0.70). (iii) There is a range of values for each hyperparameter in which the performance of the model is not significantly affected but remains close to the optimal. Thus, a compromise between hyperparameter interactions (i.e., their values) can produce similar high model performances. Model improvements after optimization can be explained from a hydrological point of view, the generalization ability for lead times larger than the concentration time of the catchment tend to rely more on hyperparameterization than in what they can learn from the input data. This insight can help in the development of operational early warning systems.

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Build Time Analysis of Additive Manufacturing for Next Generation SLS Systems

Volume 2B: Advanced Manufacturing ◽

10.1115/imece2020-24017 ◽

2020 ◽

Author(s):

Michael Machado ◽

Raul Fangueiro ◽

Daniel Barros ◽

Luís Nobre ◽

João Bessa ◽

...

Keyword(s):

Additive Manufacturing ◽

Selective Laser Sintering ◽

Material Point ◽

Point Of View ◽

Efficient Production ◽

Robust Solution ◽

Functional Product ◽

Build Time ◽

Consistent Solution ◽

Production Solutions

Abstract With the recent advances in the additive manufacturing (AM) production technologies, AM is becoming more common in today’s industry, nowadays is a normal practice to use this solution either to test a new prototype or to manufacture a functional product. The increase application is mainly due to significant developments in the production solutions of the AM. These recent developments are resulting in an increase search for new and more efficient production solutions. This search is always focused in producing more efficiently, with a greater variety of materials and produce part with better quality and proprieties. From an industrial point of view, one of the types of additive manufacturing that is increasing the percentage of use is the selective laser sintering (SLS) technologies. Although this process was first used in the mid-80’s, it has shown great developments in the recent years. This evolution of the process allowed it to become a solid solution even if it is highly time consuming, especially when compared with other types of addictive manufacturing. From the several aspects that make the SLS a robust solution is the fact that it offers a consistent solution to produce high complex part with good mechanical properties, and also the ability to use many core materials, from polymers, metal alloy, ceramics or even composites materials. Due to the fact that the production of part using SLS technologies takes a long time, shows the relevance to study the entire process in order to quantify the time spent in each stage a very important step. This study can be conducted with two major goals, in one hand to be able to predict the build time needed to complete a predetermined task, and in other hand, to improve the overall efficiency of the process based on the knowledge acquired in the previous analysis. These two aspects are important because they allow the machine operator to choose the production plan more carefully and also to know all the parameters of the process to make it more efficient. In this paper will be presented a survey of the major stages of a SLS process in order to quantify the time consumed in each one of the stages, and if possible, determine solution to reduce the time spent. To better understand the topic the paper will be divided according to the proprieties and time consumed in each of the elements of the process. In other words, it will be divided accordingly to a machine, laser and material point of view. Furthermore, this paper will be focused in the SLS process and the productions based in a polymeric powder, therefore also containing aspects related to the power source used.

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Certain Notions of Neutrosophic Topological K-Algebras

Mathematics ◽

10.3390/math6110234 ◽

2018 ◽

Vol 6 (11) ◽

pp. 234 ◽

Cited By ~ 2

Author(s):

Muhammad Akram ◽

Hina Gulzar ◽

Florentin Smarandache ◽

Said Broumi

Keyword(s):

Fuzzy Sets ◽

Intuitionistic Fuzzy Sets ◽

Point Of View ◽

Neutrosophic Set ◽

Neutrosophic Sets ◽

Intuitionistic Fuzzy ◽

Research Article

The concept of neutrosophic set from philosophical point of view was first considered by Smarandache. A single-valued neutrosophic set is a subclass of the neutrosophic set from a scientific and engineering point of view and an extension of intuitionistic fuzzy sets. In this research article, we apply the notion of single-valued neutrosophic sets to K-algebras. We introduce the notion of single-valued neutrosophic topological K-algebras and investigate some of their properties. Further, we study certain properties, including C 5 -connected, super connected, compact and Hausdorff, of single-valued neutrosophic topological K-algebras. We also investigate the image and pre-image of single-valued neutrosophic topological K-algebras under homomorphism.

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Intention, Principle, Outputs and Aims of the Experimental Pavilion Research of Building Envelopes Including Windows for Wooden Buildings

Civil and Environmental Engineering ◽

10.1515/cee-2017-0005 ◽

2017 ◽

Vol 13 (1) ◽

pp. 42-51 ◽

Cited By ~ 3

Author(s):

Daniela Štaffenová ◽

Ján Rybárik ◽

Miroslav Jakubčík

Keyword(s):

Experimental Research ◽

Climatic Conditions ◽

Point Of View ◽

Physical Parameters ◽

Data Sets ◽

Data Set ◽

Building Envelopes ◽

Climate Conditions ◽

Time Period

AbstractThe aim of experimental research in the area of exterior walls and windows suitable for wooden buildings was to build special pavilion laboratories. These laboratories are ideally isolated from the surrounding environment, airtight and controlled by the constant internal climate. The principle of experimental research is measuring and recording of required physical parameters (e.g. temperature or relative humidity). This is done in layers of experimental fragment sections in the direction from exterior to interior, as well as in critical places by stable interior and real exterior climatic conditions. The outputs are evaluations of experimental structures behaviour during the specified time period, possibly during the whole year by stable interior and real exterior boundary conditions. The main aim of this experimental research is processing of long-term measurements of experimental structures and the subsequent analysis. The next part of the research consists of collecting measurements obtained with assistance of the experimental detached weather station, analysis, evaluation for later setting up of reference data set for the research locality, from the point of view of its comparison to the data sets from Slovak Hydrometeorological Institute (SHMU) and to localities with similar climate conditions. Later on, the data sets could lead to recommendations for design of wooden buildings.

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Clinical anatomy of the female pelvic organs

Kazan medical journal ◽

10.17816/kazmj78430 ◽

1926 ◽

Vol 22 (11) ◽

pp. 1301-1302

Author(s):

V. Gruzdev

Keyword(s):

Scientific Basis ◽

Point Of View ◽

Female Genitalia ◽

Clinical Anatomy ◽

Practical Medicine ◽

Pelvic Organs ◽

Original Title ◽

Female Genital

As all other branches of practical medicine, gynecology is based on a solid scientific basis, which is primarily the anatomy of the female genital parts and other pelvic organs of the woman. With the study of this base and should begin familiarity with the discipline, if only one who studies the latter wishes to more or less thoroughly and firmly master it. From this point of view, the custom of prefixing the description of the female genitalia to the description of gynecologic statistics in gynecology manuals must be regarded as fully rational. From the same point of view, one cannot but welcome the appearance of the work, the original title of which we have given above.

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Biocompatible Ag/Fe-Enhanced TiO2 Nanoparticles as an Effective Compound in Sunscreens

Nanomaterials ◽

10.3390/nano10030570 ◽

2020 ◽

Vol 10 (3) ◽

pp. 570 ◽

Cited By ~ 3

Author(s):

Adrian Ionut Nicoara ◽

Vladimir Lucian Ene ◽

Bianca Beatrice Voicu ◽

Mihaela Adriana Bucur ◽

Ionela Andreea Neacsu ◽

...

Keyword(s):

Tio2 Nanoparticles ◽

Sol Gel ◽

Point Of View ◽

Protection Factor ◽

Wet Chemistry ◽

Amniotic Fluid Stem Cells ◽

Microwave Assisted ◽

Sun Protection Factor ◽

Unconventional Method

In this work, valuable biocompatible Ag/Fe-enhanced TiO2 nanoparticles are comparatively prepared by a conventional wet chemistry method (sol-gel) and a rapid, efficient, hybrid unconventional method (microwave-assisted hydrothermal synthesis). In order to establish their application as effective compounds in sunscreens, the obtained powders were first structurally and morphologically characterized, analyses from which their nanodimensional character, crystalline structure and thermal behavior were highlighted. The evaluation of sunscreen effectiveness is based on the determination of the sun protection factor (SPF). It was observed that silver enhancing increases the SPF significantly, especially when compared to the pristine samples. The obtained Ag/Fe-enhanced TiO2 powders were also evaluated from the point of view of their biocompatibility on amniotic fluid stem cells, and the results indicated an enhance of cell proliferation when exposed to the synthesized nanostructures.

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Degenerate curves and harmonic analysis

Mathematical Proceedings of the Cambridge Philosophical Society ◽

10.1017/s0305004100068973 ◽

1990 ◽

Vol 108 (1) ◽

pp. 89-96 ◽

Cited By ~ 24

Author(s):

S. W. Drury

Keyword(s):

Harmonic Analysis ◽

Correct Choice ◽

Degenerate Case ◽

Point Of View ◽

Affine Geometry ◽

The Poor ◽

Reference Measure ◽

Affine Arclength

This article deals with several related questions in harmonic analysis which are well understood for non-degenerate curves in ℝn, but poorly understood in the degenerate case. These questions invariably involve a positive ‘reference’ measure on the curve. In the non-degenerate case the choice of measure is not particularly critical and it is usually taken to be the Euclidean arclength measure. Since the questions considered here are invariant under the group of affine motions (of determinant 1), the correct choice of reference measure is the affine arclength measure. We refer the reader to Guggenheimer [8] for information on affine geometry. When the curve has degeneracies, the choice of measure becomes critical and it is the affine arclength measure which yields the most powerful results. From the Euclidean point of view the affine arclength measure has correspondingly little mass near the degeneracies and thus compensates automatically for the poor behaviour there. This principle should also be valid for general submanifolds of ℝn but alas the affine geometry of submanifolds is itself not well understood in general.

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Numerical Investigation on the Structural Behavior of a Composite Impact Absorber

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.417-418.685 ◽

2009 ◽

Vol 417-418 ◽

pp. 685-688 ◽

Cited By ~ 4

Author(s):

Giuseppe Lamanna ◽

Francesco Caputo ◽

Alessandro Soprano

Keyword(s):

Numerical Investigation ◽

Laminated Composite ◽

Failure Criteria ◽

Point Of View ◽

Physical Parameters ◽

Contact Conditions ◽

Explicit Finite Element ◽

Energy Absorbing ◽

Boundary Contact ◽

Composite Face

The energy absorption capability of an exposed crashworthy element or system is largely affected by material properties and structural design: prismatic sandwich structures, made of foam or honeycomb core between two metallic or laminated composite face plates, are good candidates. This work deals with a numerical investigation on the energy absorbing capability of such a structural component. There are several difficulties associated with the numerical simulation of a composite impact-absorber, such as high geometrical non-linearities, boundary contact conditions, failure criteria, material behaviour; that is because the main objectives of any numerical investigation are the calibration of the model with experimental results and the evaluation of the sensitivity of the variables with respect to the geometrical and physical parameters which influence the study at hand. The latter is a very relevant aspect for designers if the application of the model to real cases has to be a robust one from both a physical and a numerical point of view. In this paper a preliminary calibration of a numerical model for a composite impact absorber is presented, on the basis of experimental data found in literature; then a sensitivity analysis of the same model to the variation of the main geometrical and material parameters, developed by using the explicit finite element algorithms implemented in the Ls-Dyna code, is illustrated.

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SEASONALITY OF UNEMPLOYMENT IN THE COASTAL AND MOUNTAINOUS TOURIST REGIONS OF POLAND

Folia Turistica ◽

10.5604/01.3001.0010.7811 ◽

2017 ◽

Vol 43 ◽

pp. 45-58

Author(s):

Jerzy Rembeza ◽

Kamila Radlińska

Keyword(s):

Labour Market ◽

Point Of View ◽

Labour Markets ◽

Similar Distribution ◽

Seasonal Component ◽

Seasonal Fluctuations ◽

Short Term ◽

Research Article ◽

Input Range ◽

Practical Implications

Purpose. Comparison of the size, distribution and trends of seasonal fluctuations in unemployment in seaside and mountain tourist areas. Efforts were made to determine the differences between groups of regions as a whole, internal differentiation within individual regions and between selected regions. Method. The decomposition of the time series relies on extracting the seasonal component from the input range . To extract the seasonal component, we used the Census X12 ARIMA procedure. The analysis used data on the number of registered unemployed individuals in particular months from 2004 to 2014. Findings. Tourist labour markets in Poland were characterized by relatively high seasonal unemployment. Seasonality level of unemployment was significantly lower in the mountain regions than in the seaside regions. In both regions, seasonality of unemployment increased during the considered period. Seasonal fluctuations in unemployment on seaside and mountain labour markets showed a similar distribution. Research and conclusion limitations. The analysis used data on the number of registered unemployed individuals. The number of registered unemployed individuals does not fully describe the actual number of those unemployed and occurring in the short term changes in the labour market. Practical implications. The findings may be useful from the point of view of shaping instruments affecting the labour market in the tourist regions. They also allow an assessment of the changes that have occurred among labour markets in tourist regions. Originality. The originality of the research is based on comparison of seasonality in tourist regions with different locations and specifics. It allows to assess whether short-term fluctuations in unemployment in seaside and mountain tourist regions have any specificity. Type of paper. Research article.

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