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Search Results: 1 - 10 of 144407 matches for " Bir B. Bohara "
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Electronic Transport Mechanisms in PVDF/ZnO Nanocomposite Films  [PDF]
Bir B. Bohara, Ashok K. Batra, James R. Currie Jr.
Open Access Library Journal (OALib Journal) , 2019, DOI: 10.4236/oalib.1105707
In this report, we present fundamental DC conduction mechanisms of pol-yvinyl difluoride/nano-zinc oxide (PVDF/ZnO) composite films. Nano-composite films of zinc oxide in the PVDF matrix have been fabricated via a solution casting method. Space charge limited conduction (SCLC) was found to be a prominent conduction mechanism in higher voltage region and Schottky- Richardson mechanism was a possible conduction mechanism in a higher temperature region. DC activation energy for composites was found to decrease with increasing concentration of ZnO nanoparticles and reduced graphene oxide (RGO) with 1.41 eV (9.9 wt%), 1.04 eV (33.33 wt%), and 0.95 eV (33.33 wt% RGO), respectively.
Generating infinite random graphs via a uniform attachment model
Csaba Biró,Udayan B. Darji
Mathematics , 2012,
Abstract: We define a growing model of random graphs. Given a sequence of nonnegative integers $\{d_n\}_{n=0}^\infty$ with the property that $d_i\leq i$, construct a random graph on countably infinitely many vertices $v_0,v_1\ldots$, with the following process: each new vertex $i$ is connected to a $d_i$-subset of the vertices $\{v_0,\ldots,v_{i-1}\}$, where the subset is chosen uniformly at random. We study the resulting probability space.
Reproductive tract infections among women attending gynaecology outpatient department
MS Bohara,AB Joshi,B Lekhak,G Gurung
International Journal of Infection and Microbiology , 2012, DOI: 10.3126/ijim.v1i1.6940
Abstract: BACKGROUND: Women often suffer silently with reproductive tract infections (RTIs) and sexually active young women are particularly susceptible to sexually transmitted Infections (STIs). The study aimed to know the prevalence of reproductive tract infections among married women attending Gynecological Outpatients Department of Tribhuvan University Teaching Hospital (TUTH), Kathmandu, Nepal. MATERIALS AND METHODS: A hospital based crosssectional design was used to investigate RTIs among women attending outpatients department of Gynae and Obstetrics, TUTH from July to November, 2006. A total of 208 samples from 104 women were examined microscopically and culture using standard microbial technique to investigate etiological agents of RTIs. Study samples were selected and examined on the basis of either having discharge or complaints of lower abdominal pain. RESULTS: A total of 208 samples collected from 104 patients were examined and 26% samples were positive for different causative agents of RTIs. Thirty percent of women reported having symptoms related to RTIs and was common in young married women. Nineteen percent had STIs. Thirteen percent had trichomonasis and 7% had gonorrhoea identified in Gram stained smears and cultures. Many women had endogenous RTIs. Bacterial vaginosis was diagnosed in 15% and vaginal candidiasis in 25% of women. CONCLUSIONS: Young married women have a high prevalence of RTIs. Education and outreach programs are needed to reduce embarrassment and lack of knowledge related to RTIs. The low socio?economic status of women appears to have influence on high rate of infections. DOI: http://dx.doi.org/10.3126/ijim.v1i1.6940 Int J Infect Microbiol 2012;1(1):29-33
Quantum Dynamics from Classical Dissipative Systems
T. S. Biró,S. G. Matinyan,B. Müller
Physics , 1999,
Abstract: We argue that the quantized non-Abelian gauge theory can be obtained as the infrared limit of the corresponding classical gauge theory in a higher dimension. We show how the transformation from classical to quantum dynamics emerges and calculate Planck's constant from quantities defined in the underlying classical field theory.
Sexually transmitted infections among migrant people and wives of migrants in far western Nepal
Madan Singh Bohara
Journal of Kathmandu Medical College , 2013, DOI: 10.3126/jkmc.v2i3.9964
Abstract: Background: More than 340 million cases of curable sexually transmitted infections were estimated to have occurred worldwide in 1995. Previous studies have shown that the presence of other concomitant sexually transmitted infections increases the likelihood of HIV transmission. Migrant people are high risk group in acquiring HIV and other STIs. Nepal is facing rapid increase in prevalence of HIV and STIs among high-risk groups such as sex workers, injection drug users and migrant workers. Western part of Nepal faces the same threat. Objective: The aim of our study was to estimate the prevalence of STIs, and assess knowledge and risk behaviours related to STIs among migrants and their wives in Far Western Nepal. Methods: A cross-sectional analytical study was carried out in migrant workers, their wives and other women with STD syndromes in the year 2009 at Department of Microbiology, Siddhanath Science Campus, Mahendranagar, Kanchanpur. A total of 208 participants were recruited as they attended voluntary counselling and testing (VCT) centres at Kanchanpur. A structured questionnaire addressing demographic information, sexual life history, sexual contacts, and knowledge and practices related to HIV/STI transmission and prevention was filled up by face-to-face interview. Biological samples were obtained from all participants and tested for STIS, Treponema pallidum, Neisseria gonorrhoeae , and Trichomonas vaginalis , Candida albicans and bacterial vagionosis. Pearson’s chi-square analysis was performed to test associations between potential risk factors and specified diagnosed infections. Results: A total of 208 participants were examined and 24.5% were positive for different causative agents of STIs. The prevalence of T. pallidum was 2%, N. gonorrhoeae 0%, T. vaginalis 10%, Candida albicans 23% and Bacterial vaginosis 14%. The highest prevalence of STIs was found in age group 30-49 years. The prevalence of STIs was higher in males than in females. Eighty percent patients knew that STIs could be transmitted through sexual contact. Fifty three percent of the participants reported that they “always use condom”. Twenty one percent participants had sexual relationship with prostitutes. Most of participants (64%) had only one sexual partner. Twenty four percent had two to four sexual partners and 12% had more than four sexual partners. Conclusion: The result shows that migrant people are at high risk of infection. The prevalence of curable STIs is alarmingly high and emphasizes the urgent need for interventions aimed at combating the spread of
Pulmonary tuberculosis and immunological profile of HIV/AIDS patients in Far West Nepal
Madan Singh Bohara
Journal of Kathmandu Medical College , 2014, DOI: 10.3126/jkmc.v3i1.10917
Abstract: Background: Tuberculosis is itself a major public health problem in Nepal and the emergence HIV further complicated the issue. Tuberculosis is the most common cause of death among HIV/AIDS patients worldwide. Tuberculosis and HIV co-infection is associated with special diagnostic and ther apeutic challenges and constitutes an immense burden on healthcare system of heavily infected countries like Nepal. Objective: The objective of the study was to determine the prevalence of pulmonary tuberculosis and their immunologic profi les among HIV positive patients. Methods: A hospital based cross-sectional study was conducted from Januray 2012 to July 2012 among adult HIV-positive patients attending ART centers at Seti Zonal Hospital and Mahakali Zonal Hospital. Clinical and laboratory investigations including Acid Fast staining and culture were used to identify tuberculosis cases. Blood samples were collected to determine CD4+ lymphocyte count. A structured questionnaire was used to collect socio-demographic characteristics of study participants. The data was entered and analysed using SPSS version 16 software. Results: A total of 103 HIV positive participants were enrolled. Five (4.9%) of the study participants (three females and two males) were found to have pulmonary tuberculosis. Majority [4(80%)] of TB-HIV co-infection was found in 21-40 years age group. Similarly four (80%) of them were illiterate. Among five TB cases only two cases were detected by direct microscopy. In general it was observed that various clinical manifestations such as cough, chest pain, weight loss, loss of appetite etc. are more common in TB co-infected HIV patients in comparison to non-co-infected counterparts. Similarly, higher percentage of TB cases were seen in patients with low CD4+ count (<500/mm 3 ). Conclusions: We found high prevalence of tuberculosis-HIV co-infection. More such cases were seen among those with low CD4+ cell count. Early detection of co-infection is very necessary to facilitate early ART initiation, thereby strengthening their immune status. DOI: http://dx.doi.org/10.3126/jkmc.v3i1.10917 Journal of Kathmandu Medical College Vol. 3, No. 1, Issue 7, Jan.-Mar., 2014, page: 8-13
Piroska Biró
Acta Didactica Napocensia , 2011,
Abstract: The spread of Interactive Whiteboards in Hungary has made students more curious, interested and motivated. The new digital generation claims reform and besides the traditional education they need digital material, extra knowledge since it is much easier to access extra information in connection with a particular curriculum. They spend a lot of time using their computers or surfing the net which is supported by the below survey. If the teacher raises their interest in the topic instead of providing them with material which is boring and difficult to understand, the teachers will be ready to search the topic on the internet and this way they can develop their knowledge. So we need a device which might be used to colour the lesson and the interactive whiteboard is perfect for this purpose. In this paper I present the opinion of 618 students in connection with the new device. I will describe their reaction to using the board and I will list their positive and negative experiences and their ideas about the future school.
Dengue outbreak in 2006: Failure of public health system?
Singh Bir
Indian Journal of Community Medicine , 2007,
Large cliques in graphs with high chromatic number
Csaba Biró
Mathematics , 2011,
Abstract: We study graphs whose chromatic number is close to the order of the graph (the number of vertices). Both when the chromatic number is a constant multiple of the order and when the difference of the chromatic number and the order is a small fixed number, large cliques are forced. We study the latter situation, and we give quantitative results how large the clique number of these graphs have to be. Some related questions are discussed and conjectures are posed. Please note that the results of this article were significantly generalized. Therefore this paper will never be published in a journal. See instead arXiv:1103.3917 [math.CO] for the more general results.
Cooperative Spectrum Sharing Relaying Protocols With Energy Harvesting Cognitive User
Tarun Kalluri,Vivek Ashok Bohara
Computer Science , 2015,
Abstract: The theory of wireless information and power transfer in energy constrained wireless networks has caught the interest of researchers due to its potential in increasing the lifetime of sensor nodes and mitigate the environment hazards caused by conventional cell batteries. Similarly, the advancements in areas of cooperative spectrum sharing protocols has enabled efficient use of frequency spectrum between a licensed primary user and a secondary user. In this paper, we consider an energy constrained secondary user which harvests energy from the primary signal and relays the primary signal in exchange for the spectrum access. We consider Nakagami-m fading model and propose two key protocols, namely time-splitting cooperative spectrum sharing (TS-CSS) and power-sharing cooperative spectrum sharing (PS-CSS), and derive expressions for the outage probabilities of the primary and secondary user in decode-forward and amplify-forward relaying modes. From the obtained results, it has been shown that the secondary user can carry its own transmission without adversely affecting the performance of the primary user and that PS-CSS protocol outperforms the TS-PSS protocol in terms of outage probability over a wide range of Signal to noise ratio(SNRs). The effect of various system parameters on the outage performance of these protocols have also been studied.
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