scholarly journals Some Properties of Final Structured Spaces

2017 ◽  
Vol 1 (1) ◽  
Author(s):  
Amna M. Abdulgader Ahmed
Keyword(s):  
Quotient Space ◽  
Special Kind ◽  
Differential Structure ◽  
Mathematical Proofs ◽  
Study Results

The aim of the study was to exp;ore several properties of special kind of morphisms between structured spaces called identification mappings of structured spaces and prove some results related to them.  Let (M,τ,C )  be  a structured space in the sense of  Mostow  and let    f: (M,τ,C )  → N, where N is arbitrary, be a   function.  There is a unique differential structure on N determined by f called the final, or identification, differential structure, and the space N then called the final structured space; this structure is    greater than every differential structure  on    N    such  that    f   is  smooth. Methodology:  we provided mathematical proofs of several theorems related to final structured spaces. We investigate the composition   of two functions have final differential structures, the relation between the final structured space and its quotient space, and the bijective mappings of structured spaces. Study results to the following:  the composition of two identification mappings of structured spaces is also an identification mapping of structured spaces, a structured space N is a final structured space    whenever  N/R  is  a quotient  structured space , a bijection  f is  an  identification  mapping  of  structured spaces if and only if the mapping  f is  a  diffeomorphism. Conclusion: The study has shown some properties of final structured spaces and quotient structured spaces. Moreover, the case when the identification mapping of structured spaces f is bijection is also investigated, it has been shown    that   the notions    of diffeomorphisms    and    identification    bijections   of    structured spaces are related.

scholarly journals A Web-based spatial decision supporting system for land management and soil conservation

Solid Earth ◽  
2015 ◽  
Vol 6 (3) ◽  
pp. 903-928 ◽  
Author(s):  
F. Terribile ◽  
A. Agrillo ◽  
A. Bonfante ◽  
G. Buscemi ◽  
M. Colandrea ◽  
...  
Keyword(s):  
Urban Planning ◽  
Land Management ◽  
Rural Areas ◽  
Soil Conservation ◽  
Special Kind ◽  
End Users ◽  
Spatial Decision Support System ◽  
Web Based ◽  
Life Project ◽  
Study Results

Abstract. Today it is evident that there are many contrasting demands on our landscape (e.g. food security, more sustainable agriculture, higher income in rural areas, etc.) as well as many land degradation problems. It has been proved that providing operational answers to these demands and problems is extremely difficult. Here we aim to demonstrate that a spatial decision support system based on geospatial cyberinfrastructure (GCI) can address all of the above, so producing a smart system for supporting decision making for agriculture, forestry, and urban planning with respect to the landscape. In this paper, we discuss methods and results of a special kind of GCI architecture, one that is highly focused on land management and soil conservation. The system allows us to obtain dynamic, multidisciplinary, multiscale, and multifunctional answers to agriculture, forestry, and urban planning issues through the Web. The system has been applied to and tested in an area of about 20 000 ha in the south of Italy, within the framework of a European LIFE+ project (SOILCONSWEB). The paper reports – as a case study – results from two different applications dealing with agriculture (olive growth tool) and environmental protection (soil capability to protect groundwater). Developed with the help of end users, the system is starting to be adopted by local communities. The system indirectly explores a change of paradigm for soil and landscape scientists. Indeed, the potential benefit is shown of overcoming current disciplinary fragmentation over landscape issues by offering – through a smart Web-based system – truly integrated geospatial knowledge that may be directly and freely used by any end user (www.landconsultingweb.eu). This may help bridge the last very important divide between scientists working on the landscape and end users.

scholarly journals Excitation and Propagation of Longitudinal L (0, 2) Mode Ultrasonic Guided Waves for the Detection of Damages in Hexagonal Pipes: Numerical and Experimental Studies

2021 ◽  
Vol 2021 ◽  
pp. 1-18
Author(s):  
Xiang Wan ◽  
Meiru Liu ◽  
Xuhui Zhang ◽  
Hongwei Fan ◽  
Qinghua Mao ◽  
...  
Keyword(s):  
Guided Waves ◽  
Experimental Studies ◽  
Special Kind ◽  
Dispersion Curves ◽  
Guided Wave ◽  
Ultrasonic Guided Waves ◽  
Resource Exploitation ◽  
Ultrasonic Guided Wave ◽  
Study Results ◽  
Through Hole

The hexagonal pipe is a special kind of tube structure. Its inner surface of the cross section is in the shape of circle, while the outer surface is hexagonal. It has functioned as an essential and critical part of a drill stem in a high-torque drill machine used in various resource exploitation fields. The inspection of a hexagonal pipe to avoid its failure and thus to ensure safe operation of a drilling machine is becoming increasingly urgent and important. In this study, the excitation and propagation of ultrasonic guided waves for the purpose of detecting defects in hexagonal pipes are proposed. Dispersion curves of hexagonal pipes are firstly derived by using semianalytical finite element method. Based on these dispersion curves, longitudinal L (0, 2) mode at 100 kHz is selected to inspect hexagonal pipes. A ring of piezoelectric transducers (PZTs) with the size of 25 mm × 5 mm ×0.5 mm is able to maximize the amplitude of L (0, 2) mode and successfully suppress the undesired L (0, 1) mode in the experiments. Numerical and experimental studies have shown that the displacement field of L (0, 2) mode at 100 kHz is almost uniformly distributed along the circumferential direction. Furthermore, L (0, 2) mode ultrasonic guided waves at 100 kHz are capable of detecting circular through-hole damages located in the plane and near the edge in a hexagonal pipe. Our study results have demonstrated that the use of longitudinal L (0, 2) mode ultrasonic guided wave provides a promising and effective alternative for the detection of defects in hexagonal pipe structures.

scholarly journals The space of Keplerian orbits and a family of its quotient spaces

2021 ◽  
Vol 8 (2) ◽  
pp. 359-369
Author(s):  
Konstantin V. Kholshevnikov ◽  
◽  
Danila V. Milanov ◽  
Anastasia S. Shchepalova ◽  
◽  
...  
Keyword(s):  
Triangle Inequality ◽  
Quotient Space ◽  
Special Kind ◽  
Distance Functions ◽  
Future Research ◽  
Meteoroid Streams ◽  
C Language ◽  
Quotient Spaces ◽  
Keplerian Orbits ◽  
Elliptic Orbits

Distance functions on the set of Keplerian orbits play an important role in solving problems of searching for parent bodies of meteoroid streams. A special kind of such functions are distances in the quotient spaces of orbits. Three metrics of this type were developed earlier. These metrics allow to disregard the longitude of ascending node or the argument of pericenter or both. Here we introduce one more quotient space, where two orbits are considered identical if they differ only in their longitudes of nodes and arguments of pericenters, but have the same sum of these elements (the longitude of pericenter). The function q is defined to calculate distance between two equivalence classes of orbits. The algorithm for calculation of ̺6 value is provided along with a reference to the corresponding program, written in C++ language. Unfortunately, ̺6 is not a full-fledged metric. We proved that it satisfies first two axioms of metric space, but not the third one: the triangle inequality does not hold, at least in the case of large eccentricities. However there are two important particular cases when the triangle axiom is satisfied: one of three orbits is circular, longitudes of pericenters of all three orbits coincide. Perhaps the inequality holds for all elliptic orbits, but this is a matter of future research.

scholarly journals A web based spatial decision supporting system for land management and soil conservation

2015 ◽  
Vol 7 (1) ◽  
pp. 661-709 ◽  
Author(s):  
F. Terribile ◽  
A. Agrillo ◽  
A. Bonfante ◽  
G. Buscemi ◽  
M. Colandrea ◽  
...  
Keyword(s):  
Urban Planning ◽  
Rural Areas ◽  
Special Kind ◽  
End Users ◽  
Spatial Decision Support System ◽  
Web Based ◽  
Life Project ◽  
Study Results ◽  
Decision Supporting ◽  
Decision Supporting System

Abstract. Today it is evident that there are many contrasting demands on our landscape (e.g. food security, more sustainable agriculture, higher income in rural areas, etc.) but also many land degradation problems. It has been proved that providing operational answers to these demands and problems is extremely difficult. Here we aim to demonstrate that a Spatial Decision Support System based on geospatial cyber-infrastructure (GCI) can embody all of the above, so producing a smart system for supporting decision making for agriculture, forestry and urban planning with respect to the landscape. In this paper, we discuss methods and results of a special kind of GCI architecture, one that is highly focused on soil and land conservation (SOILCONSWEB-LIFE+ project). The system allows us to obtain dynamic, multidisciplinary, multiscale, and multifunctional answers to agriculture, forestry and urban planning issues through the web. The system has been applied to and tested in an area of about 20 000 ha in the South of Italy, within the framework of a European LIFE+ project. The paper reports – as a case study – results from two different applications dealing with agriculture (olive growth tool) and environmental protection (soil capability to protect groundwater). Developed with the help of end users, the system is starting to be adopted by local communities. The system indirectly explores a change of paradigm for soil and landscape scientists. Indeed, the potential benefit is shown of overcoming current disciplinary fragmentation over landscape issues by offering – through a smart web based system – truly integrated geospatial knowledge that may be directly and freely used by any end user (http://www.landconsultingweb.eu). This may help bridge the last much important divide between scientists working on the landscape and end users.

scholarly journals Professional self-determination theory of senior pupils in Russian psychology

2021 ◽  
pp. 187-194
Author(s):  
E. P. Shutova ◽  
A. S. Velikanova (Gerasimova)
Keyword(s):  
Professional Identity ◽  
Special Kind ◽  
Self Determination Theory ◽  
Identity Status ◽  
Self Determination ◽  
Study Results ◽  
Professional Self ◽  
The Individual ◽  
Methodological Position ◽  
Operational Component

The article analyses the psychological literature on the problem of senior pupils’ professional self-determination. The author’s theoretical and methodological position is elaborated and the results of its approbation are presented. It is shown that the available approaches can be divided into two main groups. Some researchers focus on the goal and end result of vocational self-determination, while others seek to reveal the algorithm of the process itself and/or its stages. Researchers are unanimous in their opinion that the choice of an occupation by senior pupils is the first and most responsible stage of professional self-determination for the individual as a whole. At the same time, the senior pupils’ professional self-determination concepts, which would reflect the unity of theoretical positions and methods of its study, are practically not presented in national psychology. To overcome the existing limitations, the article proposes to consider the senior pupils’ professional self-determination from the position of the activity approach as a special kind of activity with its own structure. The motivational component is the motives for choosing a career, while the operational component is the senior pupils’ professional identity status. The empirical study results of the of formation level of senior pupils’ professional self-determination are discussed on the basis of the activity methodology. 

Apportionment of Impairment from Meniscal Tears and Knee Arthritis

2013 ◽  
Vol 18 (5) ◽  
pp. 1-10 ◽  
Author(s):  
Charles N. Brooks ◽  
James B. Talmage
Keyword(s):  
Medial Meniscus ◽  
Degenerative Joint Disease ◽  
Joint Disease ◽  
Detailed Knowledge ◽  
Meniscal Tears ◽  
Knee Arthritis ◽  
Degenerative Arthritis ◽  
Study Results ◽  
Physical Findings ◽  
Causation Analysis

Abstract Meniscal tears and osteoarthritis (osteoarthrosis, degenerative arthritis, or degenerative joint disease) are two of the most common conditions involving the knee. This article includes definitions of apportionment and causes; presents a case report of initial and recurrent tears of the medial meniscus plus osteoarthritis (OA) in the medial compartment of the knee; and addresses questions regarding apportionment. The authors, experienced impairment raters who are knowledgeable regarding the AMA Guides to the Evaluation of Permanent Impairment (AMA Guides), show that, when instructions on impairment rating are incomplete, unclear, or inconsistent, interrater reliability diminishes (different physicians may derive different impairment estimates). Accurate apportionment of impairment is a demanding task that requires detailed knowledge of causation for the conditions in question; the mechanisms of injury or extent of exposures; prior and current symptoms, functional status, physical findings, and clinical study results; and use of the appropriate edition of the AMA Guides. Sometimes the available data are incomplete, requiring the rating physician to make assumptions. However, if those assumptions are reasonable and consistent with the medical literature and facts of the case, if the causation analysis is plausible, and if the examiner follows impairment rating instructions in the AMA Guides (or at least uses a rational and hence defensible method when instructions are suboptimal), the resulting apportionment should be credible.

Planned Home Births Safe, Study Results Suggest

Ob Gyn News ◽  
2005 ◽  
Vol 40 (14) ◽  
pp. 11
Author(s):  
MICHELE G. SULLIVAN
Keyword(s):  
Home Births ◽  
Study Results

Efficacy of compression stockings in preventing post-thrombotic syndrome in patients with deep venous thrombosis: a systematic review and metaanalysis

VASA ◽  
2016 ◽  
Vol 45 (2) ◽  
pp. 141-147 ◽  
Author(s):  
Jakob Martin Burgstaller ◽  
Johann Steurer ◽  
Ulrike Held ◽  
Beatrice Amann-Vesti
Keyword(s):  
Systematic Review ◽  
Venous Thrombosis ◽  
Deep Venous Thrombosis ◽  
Cochrane Library ◽  
Compression Stockings ◽  
Post Thrombotic Syndrome ◽  
Study Results ◽  
Preventive Efficacy ◽  
One Year ◽  
The Cochrane Library

Abstract. Background: Here, we update an earlier systematic review on the preventive efficacy of active compression stockings in patients with diagnosed proximal deep venous thrombosis (DVT) by including the results of recently published trials. The aims are to synthesize the results of the original studies, and to identify details to explain heterogeneous results. Methods: We searched the Cochrane Library, PubMed, Scopus, and Medline for original studies that compared the preventive efficacy of active compression stockings with placebo or no compression stockings in patients with diagnosed proximal DVT. Only randomized controlled trials (RCTs) were included. Results: Five eligible RCTs with a total of 1393 patients (sample sizes ranged from 47 to 803 patients) were included. In three RCTs, patients started to wear compression stockings, placebo stockings or no stockings within the first three weeks after the diagnosis of DVT. The results of two RCTs indicate a statistically significant reduction in post-thrombotic syndrome (PTS) of 50% or more after two or more years. The result of one RCT shows no preventive effect of compression stockings at all. Due to the heterogeneity of the study results, we refrained from pooling the results of the RCTs. In a further RCT, randomization to groups with and without compression stockings took place six months after the diagnosis of DVT, and in another RCT, only patients with the absence of PTS one year after the diagnosis of DVT were analyzed. One RCT revealed a significant reduction in symptoms, whereas another RCT failed to show any benefit of using compression stockings. Conclusions: At this time, it does not seem to be justifiable to entirely abandon the recommendations regarding compression stockings to prevent PTS in patients with DVT. There is evidence favoring compression stockings, but there is also evidence showing no benefit of compression stockings.

Central Nervous System Processing of Emotions in Children with Fecal Incontinence and Constipation

2019 ◽  
Vol 47 (1) ◽  
pp. 67-71
Author(s):  
Monika Equit ◽  
Justine Niemczyk ◽  
Anna Kluth ◽  
Carla Thomas ◽  
Mathias Rubly ◽  
...  
Keyword(s):  
Central Nervous System ◽  
Nervous System ◽  
Fecal Incontinence ◽  
Event Related Potentials ◽  
Anterior Cingulate ◽  
Afferent Pathways ◽  
Study Results ◽  
Related Potentials ◽  
The Central Nervous System ◽  
Cortical Regions

Abstract. Objective: Fecal incontinence and constipation are common disorders in childhood. The enteric nervous system and the central nervous system are highly interactive along the brain-gut axis. The interaction is mainly afferent. These afferent pathways include centers that are involved in the central nervous processing of emotions as the mid/posterior insula and the anterior cingulate cortex. A previous study revealed altered processing of emotions in children with fecal incontinence. The present study replicates these results. Methods: In order to analyze the processing of emotions, we compared the event-related potentials of 25 children with fecal incontinence and constipation to those of 15 control children during the presentation of positive, negative, and neutral pictures. Results: Children with fecal incontinence and constipation showed altered processing of emotions, especially in the parietal and central cortical regions. Conclusions: The main study results of the previous study were replicated, increasing the certainty and validity of the findings.

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