scholarly journals The effect of microwave irradiation on the synthesis of hydroxyapatite/biopolymer nanocomposites

2021 ◽  
Vol 12 (3) ◽  
pp. 201-215
Author(s):  
M. O. Kumeda ◽  
◽  
L. F. Sukhodub ◽  

Microwave irradiation (MWI) in the synthesis of materials has been an actively developing branch of science for the last three decades. Structures based on calcium phosphates (CaP) are one of the most well-known and widely used synthetic biomaterials in orthopedics and dentistry. The main topic of this review is the use of MWI in the formation of biomaterials based on calcium phosphate phases and their complexes with biopolymers (chitosan, alginate, silk fibroin). The physical bases of MW interaction with different materials are considered, including the influence of this irradiation on the structure, physicochemical and mechanical properties of biomaterials (crystallite size, porosity, strength, capability to absorb and release drugs). The main heating mechanisms during MWI are described, namely: the dipolar losses, and losses of conductivity. Important advantages of MWI treatment are reducing processing time, reducing electricity use, reducing waste and improving quality of the synthesized biomaterials. A list and comparison is made of articles describing the production of HA crystals with different morphology (nanowires, spherical, needle- and rod-shaped) with all the initial conditions and their effect on the synthesized material. The latest developments in the field of biomaterials conducted based on the laboratory “Bionanocomposite” of Sumy State University are considered. The original synthesis method of CaP-biopolymer materials is described, as well as the advantages of the synthesized scaffolds over foreign developments. It is expected that this review of the interdisciplinary topic will contribute to the further study of other new applications of microwave technologies in the synthesis of the latest modern biomaterials created by scientists, biomedical engineers in other laboratories and institutions in Ukraine and around the world.

Author(s):  
Irene Carniatto ◽  
Gustavo Biasoli Alves

 Two thousand twenty was an awkward and challenging year. Snatched up by a virus, All of a sudden, we saw ourselves working at home. We were physically away from some of the ones we love and from a daily life we were already used to. We have been living a different and introspective year, with social distance under isolation and solitude. At this time, we had the opportunity to withdraw and rethink our purposes, attitudes, values, and our place in the world. We have the chance to think about the meaning of life, look around and see the relationships we have established with one another, with my brotherhood, and with all living and non-living beings that inhabit this planet, our “Common Home”.It is difficult to think of something more challenging and able to test our resilience! This is not only from a personal point of view, but also from a social, economic and environmental point of view. That is why it is important to talk about resilience, discuss it, test it, prove it and approve it. Such resilience has made us face this Pandemic - COVID-19 and fight for our existence, fight for health, look for respect, welcome and solidarity.Many were the examples of people and companies that helped with donations, delivered masks, hospital equipment, food and so on across all places and cities. But the challenges went further. Many hospital beds and ICUs had to be installed. Health professionals, doctors, nurses and so many others were had to and still face this struggle. They are anonymous generals in their barracks who fought this War of Death for Life. Unfortunately, not everyone could be saved from COVID. The number of those who were treated and recovered in Brazil was 6,501.341 people and 44,169.851 patients worldwide, considering this year, 2020. But 2020 will be remembered as a catastrophe and calamity, because despite efforts many fell down. The causalities’ numbers was in Brazil 188,259 and 1,722.307 in the world. An invaluable loss of human life.We also had other losses such as economic, environmental and social, especially in health. Many will be left with afterpains and a weakened wellbeing as a result of this virus infection; thus, it will not be possible to evaluate the extent of this problem. Many people have gotten worse or developed psycho-emotional pathologies such as depression, panic, among them, and their quality of life has been permanently affected.Many challenges since we have been living under a restricted mobility around the world, which had never been witnessed. There were empty streets, closed shops, bus stations and airports without people for several months.It should be told that political crises, the science negationism, discriminatory acts, polarization regarding data and fake news have exacerbated this crisis. A lot of misinformation, attacks on the environment and a sever backtracking of environmental protection laws and regulations, dismantling of environmental policies, fire was set in Amazon and in Midwestern Brazil that have reached the highest levels in centuries. A relatively large group of Brazilian citizens and in other countries who said they did not believe on how risky Corona virus could be. They neither believe in press information nor insisted on crowding in bars, streets and beaches, as soon as these spaces were opened. We consider unthinkable and even irrational attitudes with scientific knowledge nowadays, since they put their lives and the population’s at risk. Future is the judge of all actions, therefore, the results will be known only tomorrow.The researchers who make up the International Research Network on Climate Resilient Development - RIPEDRC have not faded! They proposed themselves to overcome this challenge of seeking resilience and sustainability! So, with Faith in our life ideals and in a superior motivation that guides our steps and makes us overcome challenges, we have launched to public notices, investigated, questioned and disseminated knowledge supported by several projects, live lectures, events and workshops. They created programs, joint projects and online platforms were developed. In Brazil, Paraguay and Argentina Trinational Border region, the Western Paraná State University - UNIOESTE, was in charge or partner of many efforts, among which we highlight two experiences that RIPEDRC Network participants took part. 


2021 ◽  
Vol 3 (8) ◽  
pp. 567-573
Author(s):  
Iqbal Ainun Najib ◽  
Rias Gesang Kinanti ◽  
Olivia Andiana

Abstract: Obesity has become a global pandemic throughout the world and is declared the largest chronic disease by the WHO, the prevalence obesity in adolescents in the world is increasing continuously every year for men from 8.3 percent to 12.9 percent and for women in 8,4 to 13,4 percent in 2013. Therefore, it is necessary to make prevention efforts, one of which is by knowing the relationship between the incidence of obesity with life of quality and exercise during the pandemic in Malang State University students. This study uses a correlational quantitative methods with a causal design with the number of respondents being 20 students off the University of Malang State with inclusion and exclusion criteria. The results off this study were carried out by using the Spearman analysis test using the IBM SPSS 25.0 application between the life of quality and the obesity incidence showing a p-value of 0.000 with a corelation coefficient of 0.847 and for the quality of exercise with the obesity incidence, it showed a p-value of 0.015 with a correlation of coefficient of 0.535 which mean that there is a strong and significant relationship with a strong strength between variables. So conclusion for the research is that there is a relationship between the quality of life with the incidence of obesity and the quality of exercise with the incidence of obesity is a significant in Malang State University students. Abstrak: Di seluruh dunia obesitas telah menjadi pandemic dan WHO telah menyatakan sebagai penyakit kronis terbesar, Prevalensi obesitas pada remaja di seluruh dunia semakin meningkat terus – menerus per tahunnya untuk pria dari 8,3 persen kemudian menjadi 12,8 persen dan untuk perempuan 8,4 menjadi 13,4 persen pada tahun 2013. Obesitas merupakan keadaan lemak berlebih yang diakibatkan ketidakseimbangan antara pemasukan dan pengeluaran energi oleh tubuh. Oleh karena itu perlunya dilakukan upaya solusi sebagai pencegahan, salah satunya dengan mencari tahu tentang hubungan antara olahraga dan kualitas hidup dengan kejadian obesitas selama pandemi pada mahasiswa obesitas Universitas Negeri Malang. Penelitian yang ini menggunakan jenis metode kuantitatif korelasional dengan desain sebab akibat dengan jumlah responden 20 mahasiswa Universitas Negeri Malang dengan syarat yaitu kriteria eksklusi dan inklusi. Hasil penelitian ini dilakukan dengan uji analisis spearman menggunakan aplikasi IBM SPSS 25.0 antara kualitas hidup dengan kejadian obesitas menghasilkan nilai p- value yaitu 0,000 dengan correlation coefficient 0,847 dan untuk kualitas olahraga dengan kejadian obesitas menghasilkan nilai p- value 0,015 dengan correlation coefficient 0,535 yang artinya adanya hubungan yang kuat atau signifikan dengan kekuatan yang kuat antar variabel. Jadi kesimpulannya adalah bahwa terdapat hubungan antara kualitas hidup dengan kejadian obesitas dan kualitas olahraga dengan kejadian obesitas yang signifikan pada mahasiswa yang obesitas di Universitas Negeri Malang.


Author(s):  
Stela Curcubat ◽  
◽  
Tatiana Nagacevschi ◽  

The progress of knowledge about soils in the world and at the national level has established that soil is an organically-mineral body, self-contained, possessing a characteristic specific to its own - fertility. The Russian soil scientist V.V. Dokuceaev writes (1900) that the soils of Bessarabia are particularly fertile, showing a collection of soil samples collected by the scientist during his expedition (1898), a collection that is located at the Museum of Natural Sciences of the State University of Moldova. The quality of soils, during their evolution and being used in agriculture, has suffered a significant degradation.


2019 ◽  
Vol 1 (6) ◽  
pp. 53-55
Author(s):  
M. S. Turchina ◽  
M. V. Bukreeva ◽  
L. Yu. Korolyova ◽  
Zh. E. Annenkova ◽  
L. G. Polyakov

Currently, the problem of early rehabilitation of stroke patients is important, since in terms of the prevalence of cerebrovascular diseases and disability after suffering a stroke, Russia is one of the first places in the world. The complex of medical rehabilitation of such patients should provide for the early and most complete restoration of all body functions, patient education for lost skills, re-socialization of the patient and improvement of the quality of life. One of the factors contributing to a significant reduction in the quality of life after a stroke is the development of chronic constipation. The article reflects the modern methods of correction of chronic constipation in patients with limited mobility.


2013 ◽  
Vol 1 (1) ◽  
pp. 100
Author(s):  
Selçuk Yurtsever

It has been known that both in the world and in Turkey a continuous change has been experienced in the provision of health services in recent years. In this sense by adopting the customer(client) focused approach of either public or private sector hospitals; it has been seen that they are in the struggle for presenting a right, fast, trustuble, comfy service. The purpose of this research is to measure the satisfaction degree, expectations and perceptions of the patients in Karabük State Hospital through comparison. In this context, the patient satisfaction scale which has been developed as a result of literature review has been used and by this scale it has been tried to measure the satisfaction levels of the patients in terms of material and human factors which are the two main factors of the service that was presented. In the study, with the scales of Servqual and 0-100 Points together, in the part of the analysis MANOVA have been used. The expectations and the perceptions of the patient has been compared first by generally and then by separating to different groups according to the various criterias and in thisway it has been tried to be measured their satisfaction levels. According to the results that were obtained, although, the satisfaction levels of the patients who have taken service from Karabük State Hospital are high in terms of thedoctors and the nurses; it has been reached to the result that their satisfaction levels are low in terms of the materials that have been used at the presenting of the service and the management.


GIS Business ◽  
2019 ◽  
Vol 14 (4) ◽  
pp. 85-98
Author(s):  
Idoko Peter

This research the impact of competitive quasi market on service delivery in Benue State University, Makurdi Nigeria. Both primary and secondary source of data and information were used for the study and questionnaire was used to extract information from the purposively selected respondents. The population for this study is one hundred and seventy three (173) administrative staff of Benue State University selected at random. The statistical tools employed was the classical ordinary least square (OLS) and the probability value of the estimates was used to tests hypotheses of the study. The result of the study indicates that a positive relationship exist between Competitive quasi marketing in Benue State University, Makurdi Nigeria (CQM) and Transparency in the service delivery (TRSP) and the relationship is statistically significant (p<0.05). Competitive quasi marketing (CQM) has a negative effect on Observe Competence in Benue State University, Makurdi Nigeria (OBCP) and the relationship is not statistically significant (p>0.05). Competitive quasi marketing (CQM) has a positive effect on Innovation in Benue State University, Makurdi Nigeria (INVO) and the relationship is statistically significant (p<0.05) and in line with a priori expectation. This means that a unit increases in Competitive quasi marketing (CQM) will result to a corresponding increase in innovation in Benue State University, Makurdi Nigeria (INVO) by a margin of 22.5%. It was concluded that government monopoly in the provision of certain types of services has greatly affected the quality of service experience in the institution. It was recommended among others that the stakeholders in the market has to be transparent so that the system will be productive to serve the society effectively


Author(s):  
Артур Анатолійович Василенко

UDC 336.74   Vasylenko Artur, post-graduate student. Mariupol State University. Cryptocurrency Phenomenon in the International Monetary System. The main prerequisites of cryptocurrency emergence in the international monetary system in terms of regionalization of the world economy are defined in the article. Determination of «cryptocurrency» category was analysed from the point of two main approaches to its treatment: on the one hand cryptocurrency is admitted to be the currency equally to the sovereign currency, and on the other hand it is considered as an unrecognized virtual asset. The main consequences which arise in case of widespread use of crypto currency for the country and for the parties that agreed to use cryptocurrency were analysed and systematized. On the basis of the research, given the current trends in the world economy, the author put forward and substantiated the hypothesis to classify the phenomenon of cryptocurrency as the effects of a famous philosophical «Negation of negation law» formulated by G. Hegel at the beginning of the XIX century.   Keywords: cryptocurrency, material money, electronic money, digital currency, regional currency integration, blockchain, mining, capitalization, «Negation of negation law».


Author(s):  
Viсtor Ognevyuk

The article deals with the world rating of Ukrainian educational sphere according to The Global Competitiveness Report and UNESCO Science Report. It shows comparative indices of Ukraine in contrast to the other countries of these world ratings according to the “Quality of primary education”, “Penetration of primary education”, “Penetration of secondary education”, “Quality of secondary education”, “Quality of education in Sciences”, “Quality of school management”, “School access to the internet” and others. The article also defines strategic directions of reforming Ukrainian education system to improve its position in the world international ratings.


2020 ◽  
Author(s):  
Isra Revenia

When we compare with the quality of the best education in the world, Indonesia can catagorized as far behind. This can be seen from the achievments of students who become rejected measuring education quality in improving the qualitu of education, education supervision has very important role in developing education quality. Supervision can be interpreted as a coaching activity that has been planned to assist teachers and staff and other school staff in carrying out work effectively so that it gets good results. Supervision is a process that is applied to a job that has been carried out and even evaluates and corrects the work I to match what was determined from the start.


2019 ◽  
Author(s):  
Rika ramadani ◽  
Hade Afriansyah

Progress in information technology that is so fast is expected to improve the quality of education in Indonesia. In the world of information technology education can help and support the learning process. Especially now all the learning process activities can be done online. Progress in information technology must also be supported by quality human resources. In this case the teacher is very instrumental in the utilization of information technology in the world of education. Because the teacher is one of the education supervisors who will encourage the advancement of the quality of education in Indonesia. But in reality the quality of teachers in Indonesia is inadequate. There are still many teachers who cannot use information technology in learning especially for teachers who are senior or old. As teacher supervisors, they must improve the quality of their performance in using technology. To improve the ability of teachers to use technology, ongoing training is needed to use technology. The role of the head of the school as a supervisor is also needed, namely the principal is obliged to supervise, control, and approach the teacher in terms of the use of technology in the learning process.


Sign in / Sign up

Export Citation Format

Share Document