scholarly journals Experimental Characterization of Spurious Signals in Magnetic Nanoparticles Enhanced Microwave Imaging of Cancer

Sensors ◽  
2021 ◽  
Vol 21 (8) ◽  
pp. 2820
Author(s):  
Ovidio M. Bucci ◽  
Gennaro Bellizzi ◽  
Sandra Costanzo ◽  
Lorenzo Crocco ◽  
Giuseppe Di Massa ◽  
...  
Keyword(s):  
Magnetic Nanoparticles ◽  
Imaging System ◽  
Early Stage ◽  
Low Frequency ◽  
Microwave Imaging ◽  
Useful Signal ◽  
The One ◽  
The Impact ◽  
Instrumental Drift ◽  
Spurious Signals

Magnetic nanoparticles enhanced microwave imaging relies on the capability of modulating the response of such nanocomponents at microwaves by means of a (low frequency) polarizing magnetic field. In medical imaging, this capability allows for the detection and imaging of tumors loaded with nanoparticles. As the useful signal is the one which arises from nanoparticles, it is crucial to remove sources of undesired disturbance to enable the diagnosis of early-stage tumors. In particular, spurious signals arise from instrumental drift, as well as from the unavoidable interaction between the polarizing field and the imaging system. In this paper, we experimentally assess and characterize such spurious effects in order to set the optimal working conditions for magnetic nanoparticles enhanced microwave imaging of cancer. To this end, simple test devices, which include all components typically comprised in a microwave imaging system, have been realized and exploited. The experiment’s results allow us to derive design formulas and guidelines useful for limiting the impact of unwanted magnetic effects, as well as that relative to the instrumental drift on the signal generated by the magnetic nanoparticles-loaded tumor.

scholarly journals MRI Relaxivity Changes of the Magnetic Nanoparticles Induced by Different Amino Acid Coatings

Nanomaterials ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 394 ◽  
Author(s):  
Iryna Antal ◽  
Oliver Strbak ◽  
Iryna Khmara ◽  
Martina Koneracka ◽  
Martina Kubovcikova ◽  
...  
Keyword(s):  
Magnetic Nanoparticles ◽  
Chemical Properties ◽  
Hydrodynamic Diameter ◽  
Contrast Imaging ◽  
Dispersed Particles ◽  
Physico Chemical ◽  
The One ◽  
Molecular Contrast ◽  
The Impact ◽  
Positively Charged

In this study, we analysed the physico-chemical properties of positively charged magnetic fluids consisting of magnetic nanoparticles (MNPs) functionalised by different amino acids (AAs): glycine (Gly), lysine (Lys) and tryptophan (Trp), and the influence of AA–MNP complexes on the MRI relaxivity. We found that the AA coating affects the size of dispersed particles and isoelectric point, as well as the zeta potential of AA–MNPs differently, depending on the AA selected. Moreover, we showed that a change in hydrodynamic diameter results in a change to the relaxivity of AA–MNP complexes. On the one hand, we observed a decrease in the relaxivity values, r1 and r2, with an increase in hydrodynamic diameter (the relaxivity of r1 and r2 were comparable with commercially available contrast agents); on the other hand, we observed an increase in r2* value with an increase in hydrodynamic size. These findings provide an interesting preliminary look at the impact of AA coating on the relaxivity properties of AA–MNP complexes, with a specific application in molecular contrast imaging originating from magnetic nanoparticles and magnetic resonance techniques.

scholarly journals The meaning of feedback: medical students’ view

2021 ◽  
Vol 45 (3) ◽  
Author(s):  
Silvia Cristina Marques Nunes Pricinote ◽  
Edna Regina Silva Pereira ◽  
Nilce Maria da Silva Campos Costa ◽  
Marcos Rassi Fernandes
Keyword(s):  
Medical Students ◽  
Learning Process ◽  
Low Frequency ◽  
Theory And Practice ◽  
Internal Feedback ◽  
Feedback Frequency ◽  
The One ◽  
Skills Learning ◽  
Teaching Learning ◽  
The Impact

Abstract: Introduction: The teaching-learning process in health involves a binomial: on the one hand, teaching (the teacher and the institution) and, on the other hand, the students and their ability to adequately interact in this context. Just as teaching requires specific skills, learning also requires students to be able to master the necessary skills for learning. Feedback should also be understood in this regard. Although feedback is a frequent topic in the literature, few studies have addressed its meaning and impact from the students’ perspective. Moreover, a gap has been identified between theory and practice regarding the real power of feedback in the teaching-learning process. Objective: This study aimed to assess medical students’ understanding of feedback. Method: This is a qualitative research with a descriptive and exploratory focus, carried out using in the case study modality, with the focus group technique in data collection and thematic content analysis. The participants were medical students attending the fourth-year or eighth-semester at three schools located in the state of Goiás, Brazil. Results: The following categories emerged: understanding of feedback, frequency of received feedback, impact of feedback on the teaching-learning process and perception about the received feedback. Students understood in part the concept of feedback, not recognizing the internal feedback. A low frequency of feedback was reported and depended on the teacher, subject and year/semester of the course related to the type of curriculum. Even so, the participants recognized the points of feedback that impact on the teaching-learning process and were receptive to effective feedback. Conclusion: Even though they knew the meaning of feedback only partially and experienced it irregularly, medical students recognized the impact of this tool on the teaching-learning process. In a context of students trained to know about their own knowledge, truly empowering them in the teaching-learning process, they will develop a constant reflective practice of generating internal feedback, allowing the actual impact of feedback on the teaching-learning process to be observed in practice, as described in the literature.

scholarly journals The Impact of the COVID-19 Pandemic on Public Transport Passenger Categorization Practices: The Case of the Moscow Metro

2021 ◽  
Vol 20 (4) ◽  
pp. 111-137
Author(s):  
Ksenia Shepetina
Keyword(s):  
Social Order ◽  
Early Stage ◽  
Erving Goffman ◽  
Cultural Expectations ◽  
The Social ◽  
Harvey Sacks ◽  
The One ◽  
And Behavior ◽  
The Impact ◽  
The City

The paper is concerned with the social categorizations and perception of social diversity of the Moscow Metro passengers. Drawing on the Goffman’s theory, I assume that the interaction between passengers is based on categorization, which links appearance and behavior of people with their cultural expectations. The categorization allows to make interaction participants identifiable and accountable. In 2020 face masks and gloves, social distancing transformed the process of categorization having directly affected per-sonal front of city dwellers and situational proprieties. Using the theoretical resources of Erving Goffman, Harvey Sacks, and contemporary urban researchers, I compare how passengers of Moscow Metro recog-nized and defined each other under the regular circumstances and during the self-isolation regime, which was enforced by the city authorities at the beginning of the COVID-19 pandemic. The study is built around three general types of “Others” that were developed as abductive notions: non-specific, specific, and stigmatized Others. I analyze how these types are situationally produced and to what extent they change when the localized interactional order undergoes significant transformations. On the one hand, this study is aimed at a detailed documentation of the unique socio-historical situation that occurred at an early stage of the pandemic. On the other hand, I use it as a “natural” breaching experiment that helps to reveal the basic elements of temporal and local specificity of the social order.

scholarly journals O significado do feedback: um olhar de estudantes de medicina

2021 ◽  
Vol 45 (3) ◽  
Author(s):  
Silvia Cristina Marques Nunes Pricinote ◽  
Edna Regina Silva Pereira ◽  
Nilce Maria da Silva Campos Costa ◽  
Marcos Rassi Fernandes
Keyword(s):  
Medical Students ◽  
Learning Process ◽  
Low Frequency ◽  
Theory And Practice ◽  
Internal Feedback ◽  
Feedback Frequency ◽  
The One ◽  
Skills Learning ◽  
Teaching Learning ◽  
The Impact

Abstract: Introduction: The teaching-learning process in health involves a binomial: on the one hand, teaching (the teacher and the institution) and, on the other hand, the students and their ability to adequately interact in this context. Just as teaching requires specific skills, learning also requires students to be able to master the necessary skills for learning. Feedback should also be understood in this regard. Although feedback is a frequent topic in the literature, few studies have addressed its meaning and impact from the students’ perspective. Moreover, a gap has been identified between theory and practice regarding the real power of feedback in the teaching-learning process. Objective: This study aimed to assess medical students’ understanding of feedback. Method: This is a qualitative research with a descriptive and exploratory focus, carried out using in the case study modality, with the focus group technique in data collection and thematic content analysis. The participants were medical students attending the fourth-year or eighth-semester at three schools located in the state of Goiás, Brazil. Results: The following categories emerged: understanding of feedback, frequency of received feedback, impact of feedback on the teaching-learning process and perception about the received feedback. Students understood in part the concept of feedback, not recognizing the internal feedback. A low frequency of feedback was reported and depended on the teacher, subject and year/semester of the course related to the type of curriculum. Even so, the participants recognized the points of feedback that impact on the teaching-learning process and were receptive to effective feedback. Conclusion: Even though they knew the meaning of feedback only partially and experienced it irregularly, medical students recognized the impact of this tool on the teaching-learning process. In a context of students trained to know about their own knowledge, truly empowering them in the teaching-learning process, they will develop a constant reflective practice of generating internal feedback, allowing the actual impact of feedback on the teaching-learning process to be observed in practice, as described in the literature.

The Application of UX Research in New Energy Vehicle Innovation

2019 ◽  
Vol 1 (1) ◽  
Author(s):  
Menghan TAO ◽  
Ning XIAO ◽  
Xingfu ZHAO ◽  
Wenbin LIU
Keyword(s):  
Early Stage ◽  
Rapid Expansion ◽  
The Other ◽  
Innovative Product ◽  
Stage Of Development ◽  
New Energy ◽  
New Energy Vehicle ◽  
The One ◽  
New Energy Vehicles ◽  
Degree Of Innovation

New energy vehicles(NEV) as a new thing for sustainable development, in China, on the one hand has faced the rapid expansion of the market; the other hand, for the new NEV users, the current NEVs cannot keep up with the degree of innovation. This paper demonstrates the reasons for the existence of this systematic challenge, and puts forward the method of UX research which is different from the traditional petrol vehicles research in the early stage of development, which studies from the user's essence level, to form the innovative product programs which meet the needs of users and being real attractive.

A Microwave Imaging System for the Detection of Targets Hidden behind Dielectric Walls

2020 ◽  
Author(s):  
Renato Cicchetti ◽  
Valentina Cicchetti ◽  
Sandra Costanzo ◽  
Paolo D'Atanasio ◽  
Alessandro Fedeli ◽  
...  
Keyword(s):  
Imaging System ◽  
Microwave Imaging

Static and Dynamic Studies of Gasoline in View of its Octane Number and its Toxic Effect

2013 ◽  
Vol 12 (7) ◽  
pp. 451-459
Author(s):  
Ashraf Yehia El-Naggar ◽  
Mohamed A. Ebiad
Keyword(s):  
Toxic Effect ◽  
Aromatic Hydrocarbons ◽  
Octane Number ◽  
Liquid Fuel ◽  
Positive Impact ◽  
Hydrocarbon Composition ◽  
Different Temperatures ◽  
Different Seasons ◽  
The One ◽  
The Impact

Gasoline come primarily from petroleum cuts, it is the preferred liquid fuel in our lives. Two gasoline samples of octane numbers 91 and 95 from Saudi Arabia petrol stations were studied. This study was achieved at three different temperatures 20oC, 30oC and 50oC representing the change in temperatures of the different seasons of the year. Both the evaporated gases of light aromatic hydrocarbons (BTEX) of gasoline samples inside the tank were subjected to analyze qualitatively and quantitatively via capillary gas chromatography. The detailed hydrocarbon composition and the octane number of the studied gasoline samples were determined using detailed hydrocarbon analyzer. The idea of research is indicating the impact of light aromatic compounds in gasoline on the toxic effect of human and environment on the one hand, and on octane number of gasoline on the other hand. Although the value of octane number will be reduced but this will have a positive impact on the environment as a way to produce clean fuel.

The Development of Agritourism in the Podkarpackie Voivodeship in the Light of International and National Conditions

2017 ◽  
Vol 13 ◽  
pp. 244-261
Author(s):  
Mariola Tracz ◽  
Małgorzata Bajgier-Kowalska ◽  
Radosław Uliszak
Keyword(s):  
Development Strategy ◽  
Current State ◽  
Central Statistical ◽  
Central Statistical Office ◽  
Tourism Resources ◽  
The One ◽  
The Impact ◽  
District Offices ◽  
Socio Economic Factors

Podkarpackie Voivodeship is one of the regions of Poland in which the number of agritourism entities is very high. Therefore tourism plays a significant role in its development strategy. The aim of the paper is to identify the current state of agritourism and the changes that have occurred in the region in the years 2000–2016. Specific objectives are to determine the distribution of agritourism farms and their offer, together with a comprehensive analysis of the environmental and socio-economic factors, as well as the impact of the Slovak-Ukrainian border. The report was developed on the statistical materials from the Polish Central Statistical Office, Podkarpackie Agricultural Advisory Centre in Boguchwała and data collected from municipalities and district offices that is published on their websites, as well as through interviews with 100 owners of agritourism farms in the Podkarpackie Voivodeship. The research has shown, on the one hand, the decline in the number of farms in the region and, on the other hand, the increase in the diversity of the tourist offer of these entities. Distribution of agritourism farms is closely linked to the attractiveness of natural environment and quality of secondary tourism resources. Traditional agritourism has not yet fully used its countryside, as well as cross-border advantages of its location.

USING FIELD DATA FOR THE EVALUATION OF THE IMPACT OF ULTRA-LOW FREQUENCY MOTIONS ON THE FATIGUE OF MOORING LINES

2019 ◽  
Author(s):  
Guilherme Borzacchiello ◽  
Carl Albrecht ◽  
Fabricio N Correa ◽  
Breno Jacob ◽  
Guilherme da Silva Leal
Keyword(s):  
Field Data ◽  
Low Frequency ◽  
Mooring Lines ◽  
The Impact

KAJIAN DAMPAK KEBIJAKAN PENUTUPAN LOKALISASI TELEJU OLEH PEMERINTAH KOTA PEKANBARU

2017 ◽  
Vol 15 (2) ◽  
pp. 78
Author(s):  
M. Zainuddin
Keyword(s):  
Social Order ◽  
Qualitative Method ◽  
Negative Impact ◽  
Early Stage ◽  
Policy Research ◽  
Research Approach ◽  
Policy Content ◽  
The Government ◽  
Closure Policy ◽  
The Impact

This research to analyze the impact of closure policy Teleju brothel by Pekanbaru govermentin 2010. Guidelines for works are Pekanbaru Local Regulations No. 12 of 2008 on Social Order-liness. Closure this brothel inflicts positive and negative impact for society.The research wasconducted to obtain early stage formula for the government to take action against the prostitu-tion activities. This research uses policy research approach with a qualitative method, becausein prostitution activities and prohibition by goverment is an assessment that needs to be done byanalyzing documents and unstructured interview.The results showed that after the closing of the Teleju brothel have an impact on the deploy-ment of a prostitution and affect the economy of the surrounding residents. Government seeksto tackle prostitution in Pekanbaru by moving the brothel, conduct regular raids and providetraining. The effort is considered to be less than the maximum because the handling is not basedon the root of the problem and not programmed properly. There are several causes of failure ofgovernment to overcome the prostitution problem in Pekanbaru, including: policy content isless focus on the prostitution problem, the government did not proceeds with data, lack of finan-cial support, contra productive programs between local government with the police and TNI,and the policy object is difficult to be given understanding.

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