150 research outputs found
Adsorption Properties of Malaysian Activated Carbon for Use in Solar Refrigerator
Detail experiments and analyses have been made on the solar refrigerator
using activated charcoal and methanol adsorption cycle. A test rig was designed to
study adsorption and desorption capability of activated carbon. A comparison has
been made between adsorbability of six Malaysian commercial activated carbons. To
improve the adsorbability of the carbon a simple method was tested.
Base on Dubinin equation, some them10dynamic properties of adsorbent
adsorbate necessary for refrigeration calculation had been obtained. In this
experiment methanol is used as the refrigerant medium. The amollnt of methanol
adsorbed by the activated carbon was measured as a function of temperature of the
activated carbon. During the experiment, the temperature of the unadsorbed
methanol was kept constant. From Dubinin-Astakhov equation, parameters of
adsorption data were determined using graphical analysis. A Claperyon P-T-X
(pressure, temperature and concentration) diagram was then constructed
Quintessence with quadratic coupling to dark matter
We introduce a new form of coupling between dark energy and dark matter that
is quadratic in their energy densities. Then we investigate the background
dynamics when dark energy is in the form of exponential quintessence. The three
types of quadratic coupling all admit late-time accelerating critical points,
but these are not scaling solutions. We also show that two types of coupling
allow for a suitable matter era at early times and acceleration at late times,
while the third type of coupling does not admit a suitable matter era.Comment: 11 pages, 8 figures, revte
Data Subset-Based Methods of Inference for Spatial Individual Level Epidemic Models
Mathematical models are essential to understand infectious disease dynamics, enabling to control the spread of those diseases and preparing for public health measures. Since time and space are important factors affecting the transmission of infectious diseases, spatial individual-level models (ILM) with both temporal and spatial information are developed. Typically, Markov Chain Monte Carlo (MCMC) methods are utilized for the inference of ILM. Nonetheless, this approach can be computationally intensive for complex or large models, resulting in repeated likelihood calculations. This thesis explores various spatial and temporal subset methods to conduct statistical inference for spatial epidemic models, aiming to provide appropriate parameter estimates with minimum computational resources. In this thesis, we utilize the spatial ILM with the Euclidean distance between susceptible individuals and infectious individuals as a kernel function
Mechanisms of Fractal Formation in Colloidal Carbon-Bearing Natural System
By using the advanced nano-approach processes and phenomena in self-organizing colloidal systems are studied. The conditions of appearance of self-organized phenomena are determined and also ranges of operation of diffusion, capillary, and fractalization mechanisms are found.
When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3363
3D-Self-Assemblage and Self-Organization on Natural Colloidal Microinclusions in Mineral Sediments
The results of micro- and nanoscale research of fractal structure sediments from mineral water re-ceived by the drop method are given. Qualitative analysis of the underlying physical phenomena, allowed
us to establish the conditions of their 3D-fractalization that consider the size of colloidal nanoparticles, its
location and height from the drop center : rmin Rmax hmax and rmax Rmin hmin. It is shown that the main
contribution to 3D fractalization is due to surface tension forces and the Coulomb force interaction.
When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3625
Self-assembly and Self-organization Processes of Carbon Nanotubes in the Colloidal Systems
The features and patterns of self-organization processes in the diffusion-limited conditions (method of
drops) of carbon-containing compounds and carbon nanotubes have been studied. The results of the research
influence of the substrate temperature and solvent on the formation of nanoscale fractal structures
in sediments of colloidal solutions are provided
Self-assembly and Self-organization Processes of Carbon Nanotubes in the Colloidal Systems
The features and patterns of self-organization processes in the diffusion-limited conditions (method of
drops) of carbon-containing compounds and carbon nanotubes have been studied. The results of the research
influence of the substrate temperature and solvent on the formation of nanoscale fractal structures
in sediments of colloidal solutions are provided
Treatment outcomes from the largest antiretroviral treatment program in Myanmar (Burma): a cohort analysis of retention after scale-up.
Article approval pendingAntiretroviral treatment (ART) coverage in Myanmar is well below average. This study describes retention and baseline predictors of prognosis from the largest ART program in the country
Assessment of HIV testing among young methamphetamine users in Muse, Northern Shan State, Myanmar
Background
Methamphetamine (MA) use has a strong correlation with risky sexual behaviors, and thus may be triggering the growing HIV epidemic in Myanmar. Although methamphetamine use is a serious public health concern, only a few studies have examined HIV testing among young drug users. This study aimed to examine how predisposing, enabling and need factors affect HIV testing among young MA users. Methods
A cross-sectional study was conducted from January to March 2013 in Muse city in the Northern Shan State of Myanmar. Using a respondent-driven sampling method, 776 MA users aged 18-24 years were recruited. The main outcome of interest was whether participants had ever been tested for HIV. Descriptive statistics and multivariate logistic regression were applied in this study. Results
Approximately 14.7% of young MA users had ever been tested for HIV. Significant positive predictors of HIV testing included predisposing factors such as being a female MA user, having had higher education, and currently living with one’s spouse/sexual partner. Significant enabling factors included being employed and having ever visited NGO clinics or met NGO workers. Significant need factors were having ever been diagnosed with an STI and having ever wanted to receive help to stop drug use. Conclusions
Predisposing, enabling and need factors were significant contributors affecting uptake of HIV testing among young MA users. Integrating HIV testing into STI treatment programs, alongside general expansion of HIV testing services may be effective in increasing HIV testing uptake among young MA users
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