1,311 research outputs found
Preliminary phytochemistry and antimicrobial activity of bark of Bauhinia racemosa Lamk.
The bark of Bauhinia racemosa are reported to have great medicinal value. Phytochemical screening of the plant bark reveals the presence of carbohydrates, alkaloids, steroids and tannins. the methanol, ethanol, aqueous, acetone and petroleum ether extracts of bark of B. racemosa Lamk. prepared and antimicrobial activity were studied by agar well diffusion method against enteric bacterial pathogens such as E. coli, S. aureus, B. subtilis, P. aeruginosa and fungi A. niger and C.albicans. The methanol extracts had wide range of antimicrobial activity against enteric microbes than ethanol extracts, where as ethanol extract were slightly higher antibacterial activity than aqueous extract. Antimicrobial activity of various extracts of bark of B. racemosa was carried in attempt to develop a new pharmaceutical drug from natural origin for prevention of enteric infection
Noether Symmetries in Cosmology
All degrees of freedom related to the torsion scalar can be explored by
analysing, the gravity formalism where, is a torsion scalar and
is the teleparallel counterpart of the Gauss-Bonnet topological invariant
term. The well-known Noether symmetry approach is a useful tool for selecting
models that are motivated at a fundamental level and determining the exact
solution to a given Lagrangian, hence we explore Noether symmetry approach in
gravity formalism with three different forms of and study
how to establish nontrivial Noether vector form for each one of them. We extend
the analysis made in \cite{capozziello2016noether} for the form
and discussed the symmetry for this
model with linear teleparallel equivalent of the Gauss-Bonnet term, followed by
the study of two models containing exponential form of the teleparallel
equivalent of the Gauss-Bonnet term. We have shown that all three cases will
allow us to obtain non-trivial Noether vector which will play an important role
to obtain the exact solutions for the cosmological equations.Comment: 12 page
Accelerating Cosmological Models in Gravitational Theory
In this paper, we have explored the field equations of f(T, B) gravity as an
extension of teleparallel gravity in an isotropic and homogeneous space time.
In the basic formalism developed, the dynamical parameters are derived by
incorporating the power law and exponential scale factor function. The models
are showing accelerating behaviour and approaches to CDM at late
time.The present value of the equation of state parameter for both the cases
are obtained to be in accordance with the range provided by cosmological
observations. The geometrical parameters and the scalar field reconstruction
are performed to assess the viability of a late time accelerating Universe.
Further the stability of both the models are presented. It has been observed
that both the models are parameters dependent. Since most of the geometrically
modified theories of gravity are favouring the violation of strong energy
condition, we have derived the energy conditions both for the power law and
exponential model. In both the models, the violation of strong energy condition
established.Comment: 14 Pages, 9 figure
Review Paper - High Utility Item sets Mining on Incremental Transactions using UP-Growth and UP-Growth+ Algorithm
One of the important research area in data mining is high utility pattern mining. Discovering itemsets with high utility like profit from database is known as high utility itemset mining. There are number of existing algorithms have been work on this issue. Some of them incurs problem of generating large number of candidate itemsets. This leads to degrade the performance of mining in case of execution time and space. In this paper we have focus on UP-Growth and UP-Growth+ algorithm which overcomes this limitation. This technique uses tree based data structure, UP-Tree for generating candidate itemsets with two scan of database. In this paper we extend the functionality of these algorithms on incremental database.
Dynamical systems analysis in gravity
Teleparallel based cosmological models provide a description of gravity in
which torsion is the mediator of gravitation. Several extensions have been made
within the so-called Teleparallel equivalent of general relativity which is
equivalent to general relativity at the level of the equations of motion where
attempts are made to study the extensions of this form of gravity and to
describe more general functions of the torsion scalar . One of these
extensions is gravity; and respectively denote the
torsion scalar and scalar field. In this work, the dynamical system analysis
has been performed for this class of theories to obtain the cosmological
behaviour of a number of models. Two models are presented here with some
functional form of the torsion scalar and the critical points are obtained. For
each critical point, the stability behaviour and the corresponding cosmology
are shown. Through the graphical representation the equation of state parameter
and the density parameters for matter-dominated, radiation-dominated and dark
energy phase are also presented for both the models.Comment: 15 pages, 4 figure
PATTERN BASED USER AUTHENTICATION FOR SECURE CLOUD ACCESS AND STORAGE
Cloud system environment ensures that user can use highly extensive drivable services resource over the network as and when required. The main aim of the cloud services is the dealing out of users' information is carried out remotely. The user does not own or operate these remote machines. However users always worried about their confidential data, it might be compromised when they use this new environment. This limitation can turn into hindrance to the extensive use of cloud services resource. Paper presents to attend this problem, by using a new highly distributed information accountability cloud bundle. This cloud bundle lets user monitoring to the real usage of the user information inside cloud. This proposed cloud bundle has an object-and domain centered steps which we can use to club the logging method with users' information and policies. This proposed cloud bundle uses the jar programmable capabilities for creating active and roaming object. It also ensures that when anyone accesses the users' data, authentication and automated logging is carried out locally to the jars. In order to make the user's control strong, we can give distributed auditing methods. This proposed cloud bundle also ensures extensive experimental studies to demonstrate that the proposed steps are efficient and effective
Teleparallel scalar-tensor gravity through cosmological dynamical systems
Scalar-tensor theories offer the prospect of
explaining the cosmological evolution of the Universe
through an effective description of dark energy as a quantity
with a non-trivial evolution. In this work, we investigate
this feature of scalar-tensor theories in the teleparallel
gravity context. Teleparallel gravity is a novel description of
geometric gravity as a torsional- rather than curvature-based
quantity which presents a new foundational base for gravity.
Our investigation is centered on the impact of a nontrivial
input from the kinetic term of the scalar field. We consider a
number of model settings in the context of the dynamical system
to reveal their evolutionary behavior. We determine the
critical points of these systems and discuss their dynamics.peer-reviewe
Development of CIGS2 Thin Films on Ultralightweight Flexible Large Area Foil Sunstrates
The development of thin film solar cells is aimed at reducing the costs for photovoltaic systems. Use of thin film technology and thin foil substrate such as 5-mil thick stainless steel foil or 1-mil thick Ti would result in considerable costs savings. Another important aspect is manufacturing cost. Current single crystal technology for space power can cost more than 2 million. Moving to thin film technology could reduce this expense to less than $ 500K. Earlier publications have demonstrated the potential of achieving higher efficiencies from CIGSS thin film solar cells on 5-mil thick stainless steel foil as well as initial stages of facility augmentation for depositing thin film solar cells on larger (6 in x 4 in) substrates. This paper presents the developmental study of achieving stress free Mo coating; uniform coatings of Mo back contact and metallic precursors. The paper also presents the development of sol gel process, refurbishment of selenization/sulfurization furnace, chemical bath deposition (CBD) for n-type CdS and scrubber for detoxification of H2S and H2Se gases
Role of Host Immune Response and Viral Load in the Differential Outcome of Pandemic H1N1 (2009) Influenza Virus Infection in Indian Patients
BACKGROUND: An unusually high number of severe pneumonia cases with considerable mortality is being observed with the pandemic H1N1 2009 virus infections globally. In India, all mild as well as critically ill cases were admitted and treated in the government hospitals during the initial phase of the pandemic. The present study was undertaken during this early phase of the pandemic. METHODOLOGY: The role of viral load and host factors in the pathogenesis were assessed by examining 26 mild (MP), 15 critically ill patients (CIP) and 20 healthy controls from Pune, India. Sequential blood and lung aspirate samples were collected from CIP. Viral load and cytokines/chemokine levels were determined from the plasma and lung aspirates of the patients. TLR levels were determined by staining and FACS analysis. Gene profiling was done for both cells in the lung aspirates and PBMCs using TaqMan Low Density arrays. Antibody titres and isotyping was done using HA protein based ELISAs. PRINCIPAL FINDINGS: 13/15 critically ill patients expired. All plasma samples were negative for the virus irrespective of the patient's category. Sequential lung samples from CIP showed lower viral loads questioning association of viral replication with the severity. Anti-rpH1N1-09-HA-IgG titres were significantly higher in critically ill patients and both categories circulated exclusively IgG1 isotype. Critically ill patients exhibited increase in TLR-3, 4, 7 and decrease in TLR-2 expressions. The disease severity correlated with increased plasma levels of IL1RA, IL2, IL6, CCL3, CCL4 and IL10. Majority of the immune-function genes were down-regulated in the PBMCs and up-regulated in the cells from lung aspirates of critically ill patients. No distinct pattern differentiating fatal and surviving patients was observed when sequential samples were examined for various parameters. CONCLUSIONS: Disease severity was associated with pronounced impairment of host immune response
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