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Search Results: 1 - 10 of 193901 matches for " G.; Lorenzo "
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Un nuevo espacio para el derecho; rese a al libro "Facticidad y validez" de Jürgen Habermas
Lorenzo Espinosa Gómez
Signos filosóficos , 1999,
Abstract:
Vertical Farming Using Hydroponic System: Toward a Sustainable Onion Production in Nueva Ecija, Philippines  [PDF]
Marilou P. Pascual, Gina A. Lorenzo, Arneil G. Gabriel
Open Journal of Ecology (OJE) , 2018, DOI: 10.4236/oje.2018.81003
Abstract: The development of new technology for food production is essential to sustain man’s needs for survival. The use of farmlands for food production and industrial purposes goes beyond the carrying capacity of the environment. The study determined the applicability of Vertical Farming using Hydroponic Technology to onion production in Nueva Ecija, Philippines. The country is known as the onion capital of Southeast Asia. The study measured the technology’s sustainability and acceptability to onion farmers. By using experimental method, interview, and Focused Group Discussions (FGD), the study established its viability. Three phases of field experiments were conducted in August 2016, May 2017 and July 2017 using the Vertical Farming and Hydroponics Technology and Single Factor Analysis of Variance. The results showed that there is significant difference in the growth of onion bulb per week and the suitability and comparability of the technology to conventional farming. The study concluded that the VFH technology is acceptable to most onion farmers except the aspect of the cost of initial investment which requires government subsidy for the ordinary onion grower to avail of this new and sustainable technology in onion production.
Student understanding of rotational and rolling motion concepts
Lorenzo G. Rimoldini,Chandralekha Singh
Physical Review Special Topics. Physics Education Research , 2005,
Abstract: We investigated the common difficulties that students have with concepts related to rotational and rolling motion covered in the introductory physics courses. We compared the performance of calculus- and algebra-based introductory physics students with physics juniors who had learned rotational and rolling motion concepts in an intermediate level mechanics course. Interviews were conducted with six physics juniors and ten introductory students using demonstration-based tasks. We also administered free-response and multiple-choice questions to a large number of students enrolled in introductory physics courses, and interviewed six additional introductory students on the test questions (during the test design phase). All students showed similar difficulties regardless of their background, and higher mathematical sophistication did not seem to help acquire a deeper understanding. We found that some difficulties were due to related difficulties with linear motion, while others were tied specifically to the more intricate nature of rotational and rolling motion.
Lista de los mamíferos terrestres de Chiapas: endemismo y estado de conservación
Oscar G. Retana,Consuelo Lorenzo
Acta zoológica mexicana , 2002,
Abstract: En este trabajo se presenta la lista taxonómica actualizada de los mamíferos terrestres del Estado de Chiapas, cuya composición mastofaunística está representada por 204 especies, de las cuales 106 (52%) son quiropteros. Del total de especies registradas, siete son endémicas de Chiapas, nueve endémicas de México y 50 endémicas de Mesoamérica. A pesar de que el 56.1% de estas 66 especies endémicas pertenecen al Orden Rodentia, la riqueza de rodeores se puede considerar como pobre para el Estado, ya que solo se registran 48 especies. Con respecto al estado de conservación de los mamíferos que habitanen Chiapas, el 31.9% de las especies se encuentra enlistado dentro de alguna categoría especial de protección en la NOM-059, en tanto que la UICN clasifica al 19.1% de ellas y el CITES incluye en sus apéndices el 11.8% del total de especies. La política estatal de conservación de la fauna silvestre deberá atender la protección de las especies endémicas que habitan en Chiapas y dar prioridad a los estudios que generen información sobre estas especies a nivel regional. Pues sólo con ello, se puede llegar a tener una base más sólida en el conocimiento de la diversidad mastofaunística de Chiapas que permita instrumentar un plan de manejo y conservación.
Student understanding of rotational and rolling motion concepts
Lorenzo G. Rimoldini,Chandralekha Singh
Physics , 2005, DOI: 10.1103/PhysRevSTPER.1.010102
Abstract: We investigated the common difficulties that students have with concepts related to rotational and rolling motion covered in the introductory physics courses. We compared the performance of calculus- and algebra-based introductory physics students with physics juniors who had learned rotational and rolling motion concepts in an intermediate level mechanics course. Interviews were conducted with six physics juniors and ten introductory students using demonstration-based tasks. We also administered free-response and multiple-choice questions to a large number of students enrolled in introductory physics courses, and interviewed six additional introductory students on the test questions (during the test design phase). All students showed similar difficulties regardless of their background, and higher mathematical sophistication did not seem to help acquire a deeper understanding. We found that some difficulties were due to related difficulties with linear motion, while others were tied specifically to the more intricate nature of rotational and rolling motion.
Hamiltonian Truncation Study of the Phi^4 Theory in Two Dimensions
Slava Rychkov,Lorenzo G. Vitale
Physics , 2014, DOI: 10.1103/PhysRevD.91.085011
Abstract: We defend the Fock-space Hamiltonian truncation method, which allows to calculate numerically the spectrum of strongly coupled quantum field theories, by putting them in a finite volume and imposing a UV cutoff. The accuracy of the method is improved via an analytic renormalization procedure inspired by the usual effective field theory. As an application, we study the two-dimensional Phi^4 theory for a wide range of couplings. The theory exhibits a quantum phase transition between the symmetry-preserving and symmetry-breaking phases. We extract quantitative predictions for the spectrum and the critical coupling and make contact with previous results from the literature. Future directions to further improve the accuracy of the method and enlarge its scope of applications are outlined.
Hamiltonian Truncation Study of the Phi^4 Theory in Two Dimensions II. The Z_2-Broken Phase and the Chang Duality
Slava Rychkov,Lorenzo G. Vitale
Physics , 2015,
Abstract: The Fock-space Hamiltonian truncation method is developed further, paying particular attention to the treatment of the scalar field zero mode. This is applied to the two-dimensional Phi^4 theory in the phase where the Z_2-symmetry is spontaneously broken, complementing our earlier study of the Z_2-invariant phase and of the critical point. We also check numerically the weak/strong duality of this theory discussed long ago by Chang.
Analysis of Volutin Granule Formation in Saccharomyces cerevisiae  [PDF]
Pamela A. Marshall, David B. De La Rosa, Lorenzo G. Sanchez, Matthew L. Starr
Advances in Microbiology (AiM) , 2014, DOI: 10.4236/aim.2014.48051
Abstract:

The budding yeast Saccharomyces cerevisiae serves as an effective model organism for many cellular pathways including phosphate transport, accumulation, and storage. In S. cerevisiae, phosphate is actively transported across the plasma membrane via several phosphate carriers and is then transported into the acidic vacuole (roughly equivalent to the mammalian lysosome with degradative functions but with additional storage functions, such as calcium) where it is synthesized into volutin, a storage form of polyphosphate, found in many organisms. We have been studying volutin granule formation in wild type cells to determine the physiological requirements for formation and in mutants to determine the pathway by which the volutin biosynthetic proteins are transported to the vacuole. Undertaking an analysis of volutin formation in yeast vacuoles by blocking vacuole function with pharmacological agents, such as ionomycin and CCCP, we see that vacuole pH as well as vacuolar calcium seems critical for volutin formation. Different blocks in vacuolar protein sorting have differential effects on volutin granule accumulation, with volutin granule formation seen in all mutant strains thus far tested, except for vps33, a mutant cell strain lacking all vacuolar structure. Our data are consistent with pleiotrophic effects of vacuolar physiological function blocks leading to a decrease in volutin formation.

Population Size Influences Amphibian Detection Probability: Implications for Biodiversity Monitoring Programs
Lorenzo G. Tanadini, Benedikt R. Schmidt
PLOS ONE , 2011, DOI: 10.1371/journal.pone.0028244
Abstract: Monitoring is an integral part of species conservation. Monitoring programs must take imperfect detection of species into account in order to be reliable. Theory suggests that detection probability may be determined by population size but this relationship has not yet been assessed empirically. Population size is particularly important because it may induce heterogeneity in detection probability and thereby cause bias in estimates of biodiversity. We used a site occupancy model to analyse data from a volunteer-based amphibian monitoring program to assess how well different variables explain variation in detection probability. An index to population size best explained detection probabilities for four out of six species (to avoid circular reasoning, we used the count of individuals at a previous site visit as an index to current population size). The relationship between the population index and detection probability was positive. Commonly used weather variables best explained detection probabilities for two out of six species. Estimates of site occupancy probabilities differed depending on whether the population index was or was not used to model detection probability. The relationship between the population index and detectability has implications for the design of monitoring and species conservation. Most importantly, because many small populations are likely to be overlooked, monitoring programs should be designed in such a way that small populations are not overlooked. The results also imply that methods cannot be standardized in such a way that detection probabilities are constant. As we have shown here, one can easily account for variation in population size in the analysis of data from long-term monitoring programs by using counts of individuals from surveys at the same site in previous years. Accounting for variation in population size is important because it can affect the results of long-term monitoring programs and ultimately the conservation of imperiled species.
El papel de los marcadores tumorales en la consulta de urología para el screening, diagnóstico y seguimiento del cáncer de vejiga
Lorenzo Gómez,M.F.;
Actas Urológicas Espa?olas , 2003, DOI: 10.4321/S0210-48062003000200006
Abstract: purpose: review the tumor markers for screening and diagnosis of transitional cell carcinoma of the bladder. methods: the published literature on bladder cancer markers was identified using a medline search and critically analyzed. the sensitivity and specificity of the various markers were compared. results: conventional non-invasive methods for diagnosis (symptoms and urine cytology) and for screening and follow-up of transitional cell carcinoma of the bladder are not very sensitive and must not be considered sufficient. some tumor markers seem to be a good alternative to the routine urinary cytology. conclusion: the role of tumor markers for screening and follow-up of bladder tumors as an alternative to cytology deserve consideration. in the future, more sensitive and specific markers may replace routine cystoscopy.
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