Nelsen B.,University of Pittsburgh |
Liu G.,University of Pittsburgh |
Steger M.,University of Pittsburgh |
Snoke D.W.,University of Pittsburgh |
And 4 more authors.
Physical Review X | Year: 2014
We report new results of Bose-Einstein condensation of polaritons in specially designed microcavities with a very high quality factor, on the order of 106, giving polariton lifetimes of the order of 100 ps. When the polaritons are created with an incoherent pump, a dissipationless, coherent flow of the polaritons occurs over hundreds of microns, which increases as density increases. At high density, this flow is suddenly stopped, and the gas becomes trapped in a local potential minimum, with strong coherence.
Pojas R.G.,MSU Iligan Institute of Technology |
Tabugo S.R.M.,MSU Iligan Institute of Technology
AACL Bioflux | Year: 2015
Fluctuating asymmetry (FA) is defined as subtle, random deviation from perfect symmetry and is the most commonly used estimate of developmental stability. It has been found to increase with the presence of stressors including parasite infestation. In this study, potential relationships were investigated between the presence of parasite and its effect to FA as a widely employed measure of developmental stability on Sardinella sp. FA levels as asserted in many studies increases with developmental instability. Sardinella sp. from Misamis Oriental were collected and assessed for the presence of parasites in the gills. Fluctuating asymmetry in the traits were analyzed using landmark method for shape asymmetry, via Symmetry and Asymmetry in Geometric Data (SAGE) program. A total of twelve landmark points were used and a total of 200 fishes were evaluated. Procrustes ANOVA showed insignificant levels of FA for Sardinella sp. found without parasite while those found with parasites showed significant levels of FA. Thus, in consistency with other studies, that the presence of parasites may affect the developmental stability of an organism as seen in the asymmetry measurement of the left and right sides of the organism, which implies the extent to which the organism is able to buffer any disturbance. Hypothesis assumes that parasites can cause an increased level of FA due to the stress it induced in the development of the organism. An increase level of FA has implications on species fitness and adaptation. Presence of parasites has negative impact on host fitness. © 2015, BIOFLUX SRL. All rights reserved.
Ambe A.M.H.,MSU Iligan Institute of Technology |
Brereton M.F.,Queensland University of Technology |
Rittenbruch M.,Queensland University of Technology
Proceedings of the ACM Conference on Computer Supported Cooperative Work, CSCW | Year: 2016
This study investigates how offshore information technology (IT) service providers (vendors) coordinate work with their clients (employers) in order to succeed in the global IT offshore outsourcing industry. We reviewed literature on coordination studies, interviewed offshore service providers in the Philippines, and used thematic analysis to analyse coordination practices from the point of view of these individual vendors in a newly industrialized country. We used Olson and Olson's framework on 'collaboration at a distance' as a lens to structure the results. The study provides an understanding of vendors' individual attitudes towards the coordination of distributed work and draws attention to how differences in power affect the work situation of vendors, and by implication all stakeholders. We offer this insight as a way to enhance existing CSCW frameworks, by imbuing them with the perspective of non-equal relationships. The study found that vendors were generally able to produce outputs that satisfy their clients, however these results were only achieved because individuals were willing to take risks and make sacrifices in their personal lives. The relationship was further characterised by a complex interplay between the client's control of the overall work arrangements and the vendors' ability to establish a level of autonomy in their work practices and their flexible use of coordination tools. © 2016 ACM.
Allen D.H.,MSU Iligan Institute of Technology |
Villanueva E.P.,MSU Iligan Institute of Technology
IOP Conference Series: Materials Science and Engineering | Year: 2015
The development of technologies that make use of renewable energy is of great significance presently. A new kind of turbine called Split Reaction Water Turbine (SRWT) using PVC pipes as material is a major contribution towards harnessing the energy potentials of small stream low head water resources. SRWTs of diameter to height ratio (D/H = 110 cm/160 cm) were tested at the MSU-IIT College of Engineering Fluid Engineering Laboratory. Data on volumetric flow and pressure head at the turbine inlet of the SRWT were recorded using National Instrument Data Processing System using LabView software. In later experiments, guide ribs were installed at the vane of the exit nozzles in order to determine the difference in the performance of the ribbed and the non-ribbed SRWT. Simulations of the running SRWT were conducted using SOLIDWORKS software. Results of the simulations aided in the thorough analyses of the data from the experimental runs. A comparison of data from the ribbed and non-ribbed SRWT shows that guide ribs were effective in directing the momentum of the exiting water to improve the speed of rotation. In this study, the increase in the speed of the Split Reaction Water Turbine was as much as 46%.
Nuneza O.M.,MSU Iligan Institute of Technology |
Ates F.B.,University of the Philippines at Mindanao |
Alicante A.A.,Mindanao State University
Biodiversity and Conservation | Year: 2010
Mt. Malindang is one of the upland ranges where biodiversity has been severely threatened due to forest loss. Fieldwork was conducted from October 2003 to December 2004 in 14 sampling sites from an elevation of 120 to over 1,700 m above sea level to assess the distribution of endemic and threatened herpetofaunal species. Twenty-six species of amphibians and 33 species of reptiles were observed for all sampling sites. The level of endemism for amphibians was 42% where 7 of the 11 recorded species are found only in Mindanao. Nine species were in the threatened category, 8 vulnerable and 1 endangered. For the reptiles, 48% endemicity was observed. No threatened species was found. Field observations show that the major threat to the herpetofauna is habitat destruction, particularly the conversion of the forest to agricultural farms by the local people. It was also observed that endemic and threatened species were distributed in high elevation sites (submontane, dipterocarp, almaciga, and montane forests). Despite habitat loss in Mt. Malindang, 18% of the recorded herpetofaunal species recorded in the Philippines were found in Mt. Malindang, indicating the conservation importance of this mountain range. © Springer Science+Business Media B.V. 2009.
Fernandez M.J.F.,MSU Iligan Institute of Technology |
Sato H.,Kyoto University
Theoretical Chemistry Accounts | Year: 2011
The solvent dependence of several properties of (2,2,6,6-Tetramethylpiperidine-1-yl)oxyl (TEMPO) is investigated by the reference interaction site model self-consistent field (RISM-SCF) theory. Time-dependent density functional theory (TDDFT) coupled with RISM-SCF-SEDD (spatial electron density distribution) is used to evaluate the n → π* transition energies and the results are compared to the reported experimental values. © 2011 Springer-Verlag.
Creencia E.C.,MSU Iligan Institute of Technology |
Tsukamoto M.,Niigata University |
Horaguchi T.,Niigata University
Journal of Heterocyclic Chemistry | Year: 2011
The Fischer indole synthesis was carried out using microwaves instead of conventional heating procedures. When the mixture of phenylhydrazine, cyclohexanone and zinc chloride was irradiated at 600 W for 3 min, 76% of 1,2,3,4-tetrahydrocarbazole was obtained. However, when zinc chloride was replaced with p-toluenesulfonic acid (p-TSA), the reaction yielded 91% of 1,2,3,4-tetrahydrocarbazole. Thus, a series of indoles were prepared using microwaves in the presence of p-TSA catalyst. © 2011 HeteroCorporation.
Rivera A.P.,MSU Iligan Institute of Technology |
Uy M.M.,MSU Iligan Institute of Technology
E-Journal of Chemistry | Year: 2012
The phosphomolybdenum method for total antioxidant activity determination showed that the hexane, dichloromethane and ethyl acetate extracts of five marine sponge species collected off misamis oriental coast-Aaptos suberitoides, Dactylospongia elegans, Stylissa massa, Haliclona sp. and an unidentified species coded as KL-05, have varying degrees of antioxidant capacity. Expressed as ascorbic acid equivalents in μg/mL of extract, the hexane extract of Dactylospongia elegans (DeH) and the ethyl acetate extract of Aaptos suberitoides (AsE) showed the highest antioxidant capacity. Although the hexane extract of KL-05 (KL-05H) has considerable antioxidant activity, the ethyl acetate extract (KL-05E) showed no antioxidant activity. The brine shrimp assay for cytotoxicity indicated high bioactivity, with Haliclona sp., Dactylospongia elegans, Aaptos suberitoides and Stylissa massa exhibiting high % mortality and low LC 50 values. The antioxidant and cytotoxic activities of the marine sponges may be attributed to the zoochemicals present. All sponge species contain alkaloids, saponins, tannins, and flavonoids. Terpenoids are present only in Haliclona sp. and the cardiac glycosides, only in Aaptos suberitoides and Haliclona sp.
Tabanao E.S.,MSU Iligan Institute of Technology |
Rodrigo Ma.M.T.,Ateneo de Manila University |
Jadud M.C.,Allegheny College
ICER'11 - Proceedings of the ACM SIGCSE 2011 International Computing Education Research Workshop | Year: 2011
In this study, we attempted to quantify indicators of novice programmer progress in the task of writing programs, and we evaluated the use of these indicators for identifying academically at-risk students. Over the course of nine weeks, students completed five different graded programming exercises in a computer lab. Using an instrumented version of BlueJ, an integrated development environment for Java, we collected novice compilations and explored the errors novices encountered, the locations of these errors, and the frequency with which novices compiled their programs. We identified which frequently encountered errors and which compilation behaviors were characteristic of at-risk students. Based on these findings, we developed linear regression models that allowed prediction of students' scores on a midterm exam. However, the models derived could not accurately predict the at-risk students. Although our goal of identifying at-risk students was not attained, we have gained insights regarding the compilation behavior of our students, which may help us identify students who are in need of intervention. © 2011 ACM.
Ignacio M.,MSU Iligan Institute of Technology
XXV International Mineral Processing Congress 2010, IMPC 2010 | Year: 2010
Mindanao is a mineral rich area in the Philippines. After the new mining law was passed in 1995, the government had issued no less than 265 Mineral Production Sharing Agreements to foreign and national investors to assist the country in developing its mineral industry. However, manpower required by the industry is sorely lacking: geologists, mining engineers, and minerals/metallurgical engineers. Schools that used to offer those programs closed their offerings for lack of students. For the entire country, only two of the three universities are left to offer metallurgical engineering which is the baccalaureate degree that integrates mineral processing, metal extraction and adaptive metallurgy in a five-year engineering course. Problems encountered in establishing programs include: lack of interest among students, absence of faculty members, inadequate training facilities, hesitation of the mineral industries to invest in scholarships to encourage students to take up mineral industry related courses, and inadequate advocacy programs to promote the profession. In Mindanao, the inadequate manpower was partially answered in late 1976, when a steel industry requested MSU-Iligan Institute of Technology to start the program in Metallurgical Engineering. They provided additional support in order to attract faculty members from Manila who will establish the program. The move paid off such that even when the metals and mineral industries were down, there was a steady supply of manpower albeit fluctuating, three to 15 graduates per year. A technician program was also offered to augment skilled manpower. Earnest advocacy is being made in order to continually strengthen the program: faculty development, new government support for upgrading library collection and laboratory facilities, collaborations with industry for student scholarships, on-the-job training and access to company laboratory facilities, annual campaigns for student enrolment in the course, dedicated faculty mentoring, and alumni participation for preparing new graduates for the licensure examination. The efforts are paying off.