3,203 research outputs found
Psychometric Properties of the Physical Activity Questionnaire for Older Children in Italy: Testing the Validity Among a General and Clinical Pediatric Population
No full textThe purpose of this research was to assess an Italian version of the Physical Activity Questionnaire
for Older Children (PAQ-C-It). Three separate studies were conducted, whereby
testing general psychometric properties, construct validity, concurrent validity and the factor
structure of the PAQ-C-It among general and clinical pediatric population. Study 1 (n =
1170) examined the psychometric properties, internal consistency, factor structure (exploratory
factor analysis, EFA) and construct validity with enjoyment perception during physical
activity. Study 2 (n = 59) reported on reliability, construct validity with enjoyment and BMI,
and on cross-sectional concurrent validity with objectively measured MVPA (tri-axial accelerometry)
over the span of seven consecutive days. Study 3 (n = 58) examined the PAQ-CIt
reliability, construct validity with BMI and VO2max as the objective measurement among a
population of children with congenital heart defects (CHD). In study 2 and 3, the factor structure
of the PAQ-C-It was then re-examined with an EFA. The PAQ-C-It showed acceptable
to good reliability (alpha .70 to .83). Results on construct validity showed moderate but significant
association with enjoyment perception (r = .30 and .36), with BMI (r = -.30 and -.79
for CHD simple form), and with the VO2max (r = .55 for CHD simple form). Significant concurrent
validity with the objectively measured MVPA was reported (rho = .30, p < .05). Findings
of the EFA suggested a two-factor structure for the PAQ-C-It, with items 2, 3, and 4
contributing little to the total score. This study supports the PAQ-C-It as an appropriate
instrument to assess the MVPA levels of Italian children, including children with simple
forms of CHD. Support is given to the possible instrument effectiveness on a large international
perspective in order to level out data gathering across the globe
Bibliographics for the 983 eprints in the live archives of E-LIS : trends and status report up to 7th July 2004, based on author-self-archiving metadata
No full textThe priority for ideas and philosophy related to "Network Theory" have been traced back and documented by Braun(2004),and credit goes to Karinthy(1929).The IT has empowered to realise it, as the most practical phenomena and it is no more a humour. The OAI (Open Archives Initiatives)and ACIS (Academic Contributor Information System)are progressive in the direction ,which may lead to realise the "Collective Genius" at global level. Focus of present study is on Author-Self-Archiving (A-S-A)Metadata of the 983 Eprints in the Live Archives of the E-LIS (EPrints of Library and Information Science),which were approved till 7th July 2004.The A-S-A Metadata was used for librametric analysis. Self-explanatory bibliographics are illustrated.The highlights include: Conference papers (34%); highest approval, June 2004 (28%); published archives (76%);not refereed (52%); not in public domain (60%); highest self-archiving-author (De Robbio, Antonella).The Nos. of EPrints having single JITA domain specifications were: Theoretical and general aspects of libraries and information(27); Information use and sociology of information(80);Users,literacy and reading(13);Libraries as physical collections(30);Publishing and legal issues(57);Management(13);Industry, profession and education(36);Information sources, supports, channels(113) ; Information treatment for information services, Information functions and techniques (101); Technical services libraries, archives and museums(25); Housing technologies(1); Information technology and library technology(92); and Inter-domainery (395) i.e. having specifications of two or more than two JITA classes
Correlation between the structural, electrical and electrochemical performance of layered Li(Ni0.33Co0.33Mn0.33)O2 for lithium ion battery
No full textThe Li(Ni0.33Co0.33Mn0.33)O2 (LNCMO) cathode material is prepared by poly(vinyl pyrrolidone) (PVP)-assisted sol-gel/hydrothermal and poly(ethylene glycol)-block-poly(propylene glycol)-block-poly (ethylene glycol) (Pluronic-P123)-assisted hydrothermal methods. The compound prepared by PVP-assisted hydrothermal method shows a comparatively higher electrical conductivity of ~2 × 10−5 S cm−1 and exhibits a discharge capacity of 152 mAh g−1 in the voltage range of 2.5 to 4.4 V, for a C-rate of 0.2 C, whereas the compounds prepared by P123-assisted hydrothermal method and PVP-assisted sol-gel method show a total electrical conductivity in the order of 10−6 S cm−1 and result in poor electrochemical performance. The structural and electrical properties of LNCMO (active material) and its electrochemical performance are correlated. The difference in percentage of ionic and electronic conductivity contribution to the total electrical conductivity is compared by transference number studies. The cation disorder is found to be the limiting factor for the lithium ion diffusion as determined from ionic conductivity values. © 2015, Springer-Verlag Berlin Heidelberg.1
Phytochemical analysis, antioxidant and antimicrobial activity of wildand in vitro derived plants of Ceropegia thwaitesii Hook – An endemicspecies from Western Ghats, India
No full textCeropegia thwaitesii Hook (Asclepiadaceae), an endemic plant species, due to habitat destruction and overexploitation has a very restricted distribution in the Western Ghats of Tamil Nadu, India. The presentwrok aimed to determine the chemical composition, the total phenolic (TPC), flavonoid (TFC) and tannincontent (TEC), and to assess the antioxidant properties of various extracts of in vivo plants (IVP) andin vitro regenerated plants (IRP) of C. thwaitesii. Some phenolic compounds like gallic acid, cathechol,vanillin and salicylic acid were identified and quantified by HPLC. All the extracts possessed relevant rad-ical scavenging activity on DPPH, Superoxide radical scavenging activity, and Nitric oxide radicals as wellas total antioxidant ability. DPPH assay of in vitro methanol stems extracts and ethanol leaves extractsrevealed the best antioxidant properties with important IC50values of 0.248 ± 0.45 mg/mL and 0.397 ±0.67 mg/mL, respectively, whereas in vivo chloroform stems extracts showed a lower antioxidant activity(IC50of 10.99 ± 0.24 mg/mL). The IRP methanol extracts of stem and leaves had good inhibitory activityagainst all tested microorganisms in a dose-dependent manner. These results suggested that in vitroraised plants of C. thwaitesii are an excellent source of antioxidant compounds to be exploited on anindustrial level as food additive
A ZIF-67 derived Co 3 O 4 dodecahedron shaped microparticle electrode based extended gate field-effect transistor for non-enzymatic glucose detection towards the diagnosis of diabetes mellitus
No full textThe present study focuses on non-enzymatic glucose detection using an extended gate field-effect transistor (EGFET) based on zeolitic imidazole framework-67 (ZIF-67) derived cobalt tetraoxide (Co3O4) dodecahedron shaped microparticles. XRD has confirmed the cubic phase of Co3O4. HR-SEM images have highlighted hollow Co3O4 dodecahedra with an average particle size of 1.72 mu m. A cost-effective single-use ZIF-67 derived Co3O4 electrode has been fabricated that covers the range of glucose concentration from 1.5 mM to 42 mM (linear range: 1.5 to 10.5 mM) and has a fast response time of <4 s. The sensitivity is calculated to be 50 mu A mM(-1) cm(-2). Our prepared electrode has demonstrated a good selective response against other interfering molecules like sucrose, lactose, fructose, uric acid, and ascorbic acid. The concentration of the interfering molecules is maintained similar to the physiological conditions of human blood. As a maiden attempt, the influence of glucose concentration on the surface potential of the sensing electrode has been investigated using a scanning Kelvin probe (SKP). We have found that the work function decreases with the increase of glucose concentration. Overall, EGFET and SKP studies have revealed that the ZIF-67 derived Co3O4 dodecahedron shaped microparticle based electrode is suitable for rapid detection of glucose
Multivariate Quantitative Representativeness and Constituency Analysis of Ecological Observation Networks
No full textCite this code as: Kumar, J. (2023). Multivariate Quantitative Representativeness and Constituency Analysis of Ecological Observation Networks (Version 1.0) [Computer software]. https://doi.org/10.5281/zenodo.8048530
Multivariate Quantitative Representativeness and Constituency Analysis of Ecological Observation Networks
Author: Jitendra (Jitu) Kumar ([email protected]), Oak Ridge National Laboratory
Regional and global ecological research networks, representing coordinated and standardized as well as adhoc networks of observation sites, provide valuable observations necessary for ecological modeling and synthesis studies. Studies conducted across observational networks strive to scale up their results to larger areas, trying to reach conclusions that are valid throughout regional, continental, and even global scales. Network representativeness and constituency can show how well conditions at those locations represent conditions elsewhere within a larger area containing the network and can be used to help scale-up results over larger regions.
Representativeness: Euclidean distance between two sites plotted in multivariate environmental space can be used as an inverse measure of multivariate similarity to quantify representativeness. Close sites in environmental space have a similar combination of environmental factors, and therefore are highly representative of each other.
Constituency: For any site in the network, its Constituency represent all locations that are best represented by the multivariate environmental drivers at that site.
Code Compilation:
make
Edit the ```makefile``` as needed for your platform.
CC=gcc
CFLAGS= -O3
hpea: network_representativeness.o\
utility.o
(CFLAGS) *.o -lm -o network_representativeness
.o:
(CFLAGS) -c $<
clean:
\rm *.o network_representativeness
Running the representativeness analysis:
Usage: network_representativeness -infile input data file [ASCII]
-coordsfile coordinate file name
-clustfile coordinate file name [OPTIONAL -- must be used with -siteclustfile]
-sitefile site data file name
-siteclustfile site data file name [OPTIONAL -- must be used with -clustfile]
-nsites No. of sites
-minmaxfile minmax file name
-outfile output file name
-nrows No. of rows in input data
-ncols No. of variables
-details [OPTIONAL -- turn on output representativeness for each site, default is to write network representativeness and constituency only.]
-help program usage help.
Publications using ```network_reprentativeness``` code:
Kumar, J., Coffin, A. W., Baffaut, C., Ponce-Campos, G., Witthaus, L., and Hargrove, W. W. (2023) "Quantitative Representativeness and Constituency of the Long-Term Agroecosystem Research Network, and Analysis of Complementarity with Other Existing Ecological Networks", Environmental Management (in press)
M. M. T. A. Pallandt, J. Kumar, M. Mauritz, E. A. G. Schuur, A.-M. Virkkala, G. Celis, F. M. Hoffman, and M. Göckede. Representativeness assessment of the pan-arctic eddy covariance site network and optimized future enhancements. Biogeosciences, 19(3):559--583, 2022. https://doi.org/10.5194/bg-19-559-2022
J. Kumar, F. M. Hoffman, W. W. Hargrove, and N. Collier. Understanding the representativeness of FLUXNET for upscaling carbon flux from eddy covariance measurements. Earth System Science Data Discussion, 2016:1--25, August 2016. https://doi.org/10.5194/essd-2016-36.If you use this software, please cite it as below.
Kumar, J. (2023). Multivariate Quantitative Representativeness and Constituency Analysis of Ecological Observation Networks (Version 1.0) [Computer software]. https://doi.org/10.5281/zenodo.804853
Scientometric Portrait of Homi Jehangir Bhabha: The Father of Indian Nuclear Research Programme
No full textQuantitative and qualitative analysis with graphic representation of the publication productivity of a scientist facilitates easy and clear perception about the work of a scientist. Bhabha’s scientific work spanned over more than three decades (1933-1967) during which he published 104 publications, which could be classified into nine fields: Interaction of Radiation with Matter (4), Quantum Electrodynamics (5), Mathematical Physics (2), Cosmic Ray Physics (18), Elementary Particle Physics (14), Field Theory (15), General Physics (2), Nuclear Physics (4) and General (40). The highest number of publications (6) were published in 1941, 1945 and 1964 respectively. The average number of publications published per year was 3.05. His productivity coefficient was 0.05 which is a clear indicates that his publication productivity was quite consistent throughout his scientific career. He was single author in 79 of his publications and the main author in 24 publications indicates that he always preferred to work himself and lead the team as ‘mentor’. Bhabha had 22 collaborators during the period. Team of research collaborators working with a successful scientist documents the sociological aspect of history of science while generating knowledge by a leader in a domain.
Bhabha became a citable author in 1937. Bhabha received 1211 citations to his 30 publications out of 104 publications. Out of 104, 74 publications did not receive any citations. Out of 74 publications, 40 publications dealt subjects mainly of general interest. Bhabha’s 86.66 percent of cited publications received their first citations within four years of their publication indicates that his publications were noticed immediately and had direct impact among the fellow researchers working all over the world. His overall citation rate was 11.64 per cited publication. The highest citations 389 were received to the domain ‘Cosmic ray physics’. The highest number of citations received were 45 in 1938. His self-citations were only 24 (1.98%) and citations by others were 1187 (98.02%). The highest self citations were six in 1946. Bhabha’s mean diachronous self-citation rate was 1.98. The highest citation rate 28.4 was to the domain ‘Quantum electrodynamics. His single authored publications have received the highest number 863 (71.26%) of citations. Bhabha’s five publications have been cited more than 100 times each. His publications have been cited by the authors working in various diverse fields like nuclear physics, mathematical physics, instrumentation, optics, geophysics and geochemistry, condensed matter physics, applied physics, electrical and electronic engineering, mechanical engineering etc., indicating a very diverse influence and impact of Bhabha’s publications. Bhabha’s publications have also been cited by the Nobel laureates like V. L. Ginzberg, Wolfgang Pauli, H. A. Bethe, M. Born, W. Bothe, E. P. Wigner, H. Yukawa, P. M. S. Blackett and C. N. Yang which is an indication of his originality of ideas and high quality of publications
Rural Green Marketing: Challenges and Opportunities in India
No full textRural Green Marketing: Challenges and Opportunities in India
Author / Authors : Indal Kumar
Page no.194-203
Discipline : Applied Economics/ Management/ Commerce
Script/language : English/Roman
Category : Research paper
Keywords: Rural Green Product, Environmentally safe of rural market, opportunities and challenges of Green Marketing
Acute Ethanol Administration Rapidly Increases Phosphorylation of Conventional Protein Kinase C in Specific Mammalian Brain Regions in Vivo
No full textBackground
Protein kinase C (PKC) is a family of isoenzymes that regulate a variety of functions in the central nervous system including neurotransmitter release, ion channel activity, and cell differentiation. Growing evidence suggests that specific isoforms of PKC influence a variety of behavioral, biochemical, and physiological effects of ethanol in mammals. The purpose of this study was to determine whether acute ethanol exposure alters phosphorylation of conventional PKC isoforms at a threonine 674 (p-cPKC) site in the hydrophobic domain of the kinase, which is required for its catalytic activity.
Methods
Male rats were administered a dose range of ethanol (0, 0.5, 1, or 2 g/kg, intragastric) and brain tissue was removed 10 minutes later for evaluation of changes in p-cPKC expression using immunohistochemistry and Western blot methods.
Results
Immunohistochemical data show that the highest dose of ethanol (2 g/kg) rapidly increases p-cPKC immunoreactivity specifically in the nucleus accumbens (core and shell), lateral septum, and hippocampus (CA3 and dentate gyrus). Western blot analysis further showed that ethanol (2 g/kg) increased p-cPKC expression in the P2 membrane fraction of tissue from the nucleus accumbens and hippocampus. Although p-cPKC was expressed in numerous other brain regions, including the caudate nucleus, amygdala, and cortex, no changes were observed in response to acute ethanol. Total PKC? immunoreactivity was surveyed throughout the brain and showed no change following acute ethanol injection
Continuous supply chain collaboration : Road to achieve operational excellence
No full textSupply chain management (SCM) is becoming critical as firms recognize that competition is shifting from company versus company to supply chain versus supply chain. In the present competitive scenario, the fierce competition has driven most companies to seek means of enhancing performance beyond their four wall boundaries. The firm’s ability in collaborating with its upstream and downstream partners determines its success in attaining better performance with supply chain collaboration; a firm is able to serve fragmented markets in which end customers require more product varieties and availability with shorter product life cycle and at the same time lower supply chain costs. Hence, this paper introduces the framework of continuous supply chain collaboration (CSCC), which extends the traditional frame of reference in strategic sourcing from a supplier centric to a supply-chain-scope as continuous improvement efforts to enhance the customer satisfaction. CSCC practices are rather exceptional, yet CSCC is believed to be the single most comprehensive framework for attaining operational excellence.Continuous supply chain collaboration (CSCC); Supply chain management: Continuous improvement; Operational excellence; Supply Chain Management
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