16 research outputs found
A Comparative Study of the Oxidation and Wet Chemical Methods for Uncapping the Multi-Walled Carbon Nanotubes
Carbon nanotubes (CNTs) are generally capped at either end with a half of a fullerene. Hence, for storing different materials into the hollow space of CNTs, their caps need to be removed in the first step. In this study, we studied both the oxidation and wet chemical (acid-based) methods for opening the multi-walled carbon nanotubes (MWCNTs). In The oxidation method, 250 mg of CNTs were heated at 810 °C for 15 minutes in the air, and yielded about 56 % opened CNTs, while 78 % weight loss was recorded. The second sample with the same weight of the sample 1 was treated at 780 °C for 15 min. The weight loss and yielded uncapped CNTs were recorded 36 % and 47 %, respectively. The 780 °C was observed to be more appropriate than the higher temperature. In the acid-based method, the CNTs were refluxed in boiling nitric acid (65 % analar grade) at 110 °C for 12 h. In this case, about 80 % of the CNTs were thoroughly opened without any weight loss. The acid-based method was finally deduced to be more economical and efficient than the oxidation method.
When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3094
Uncapping Multi-Walled Carbon Nanotubes Using Wet Chemical and Oxidation Methods
Different materials can be introduced into hollow space of carbon nanotubes and result in very useful
nanostructures for different applications such as energy storage, self-healing materials, nanocomposites,
etc. In this study, the multi-walled carbon nanotubes were uncapped using two methods, oxidation with
carbon dioxide or oxygen at elevated temperatures, and boiling carbon nanotubes in concentrated nitric acid chemical method was found to be more effective than the oxidation method, since the number of opened nanotubes was about 60 % more than that in oxidation method. Furthermore, unlike the oxidation method, no
weight loss was observed in the chemical method.
When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3506
Comparison of Brain-Derived Neurotrophic Factor (BDNF) and Insulin-like Growth Factor 1 (IGF-1) Responses to Different Endurance Training Intensities in Runner Men
Aims: Blood neurotrophins, such as Brain-Derived Neurotrophic Factor (BDNF) and Insulin-like Growth Factor 1 (IGF-1), mediate exercise- induced health benefits in humans. The purpose of this study was to compare the response of BDNF and IGF-1 to different endurance training intensities in runner men.
Materials & Methods: In this semi-experimental study with pre-test-posttest design in 2015, 10 people of male runners from Gorgan were selected through purposeful and accessible sampling. The endurance training protocol was 6 km running with moderate (70-75% of heart rate reserve) or severe (80-85% of heart rate reserve) intensity, which was performed within a week's interval. Fasting blood samples were collected before and immediately after both acute training sessions and serum levels of BDNF and IGF-1 were measured by ELISA and radioimmunoassay enzyme. Data were analyzed by SPSS 20 software using independent t-test and paired t-test.
Findings: Both acute endurance training significantly increased serum levels of BDNF and IGF-1 in runners, but high intensity endurance exercises increased BDNF levels in comparison with moderate intensity (p0.05).
Conclusion: Serum BDNF response in endurance athletes is affected by the intensity of exercise, so that the effect of high intensity endurance training on BDNF levels is greater than moderate intensity exercise, but the response of IGF-1 to acute endurance training is independent of the intensity of exercise
A bibliometric overview of 30 years of medical sciences productivity in Iran
Objectives: The number of medical universities and their faculty members has significantly increased in Iran during the last 30 years. This development has led to the training of a large number of healthcare professionals. But, its effect on medical sciences productivity has not yet been fully analyzed. Here, we use a bibliometric analysis to assess the current status of Iranian medical sciences production in different subject areas. Methods: The bibliographic data of Iranian medical subjects during the years 1978 - 2008 were collected from the Science Citation Index Expanded database and analyzed according to publication number, different medical subject areas, citations and the annual Iranian mid-year population. Results: It was shown that Iranian scientists have established good collaboration with developed countries. The numbers of medical publications, even after normalization to the population size, and citations of these publications have significantly increased in recent years. It has also been shown that pharmacologic research constitutes the major theme in the Iranian medical research system and thus enjoys the highest rate of growth. Conclusion: Strengthening of the non-pharmacologic research infra-structure is advised for both basic and clinical departments, keeping in mind the existing successful research model of pharmacology in Iran
The seismogenic fault system of the 2017 <i>M</i><sub>w</sub> 7.3 Iran–Iraq earthquake: constraints from surface and subsurface data, cross-section balancing, and restoration
The 2017 Mw 7.3 Iran–Iraq earthquake occurred in a region where the
pattern of major plate convergence is well constrained, but limited
information is available on the seismogenic structures. Geological
observations, interpretation of seismic reflection profiles, and well data
are used in this paper to build a regional, balanced cross section that
provides a comprehensive picture of the geometry and dimensional parameters
of active faults in the hypocentral area. Our results indicate (i) the coexistence of thin- and thick-skinned thrusting, (ii) the reactivation of
inherited structures, and (iii) the occurrence of weak units promoting
heterogeneous deformation within the palaeo-Cenozoic sedimentary cover and
partial decoupling from the underlying basement. According to our study, the
main shock of the November 2017 seismic sequence is located within the
basement, along the low-angle Mountain Front Fault. Aftershocks unzipped the
up-dip portion of the same fault. This merges with a detachment level located
at the base of the Paleozoic succession, to form a crustal-scale fault-bend
anticline. Size and geometry of the Mountain Front Fault are consistent with
a down-dip rupture width of 30 km, which is required for an Mw 7.3
earthquake
Positive-Sequence Component Based Directional Relaying Algorithm for Single-Pole Tripping
It is possible for people diagnosed with schizophrenia to recover
Services that support individuals with a diagnosis of Serious Mental Illness are called upon to deliver services that seek to promote their recovery.The National Institute for Mental Health in England (NIMHE, 2005), have been working towards defining the key features of what a recovery oriented service should look like. Optimistic as it may seem, services are a long way to undoing the effects of institutionalisation in the lives of many service users. This article provides an account of an evaluation of a Recovery Group designed to introduce participants to the recovery paradigm, in an attempt to help enhance their hopefulness about their future. It was hypothesised that when people are hopeful about achieving their goals, then they will become more motivated to pursue meaningful activities. An eight week group was conducted using outcome measures such as the Beck Hopelessness scale (1974), Lancashire Quality of Life scale, Bradburn Affect Scale and Cantill’s Life Ladder. Seven mental health service users from a Rehabilitation Inpatient Unit, and Community Team participated in the Recovery group, of whom four service users completed the programme. Despite methodological limitations of this evaluation some improvements were noted for the service users in terms of improved quality of life, a sense of optimism for the future and improved psychological well-being