169,933 research outputs found
Parapolybia nana Saito-Morooka, Nguyen & Kojima, sp. nov.
No full text<i>Parapolybia nana</i> Saito-Morooka, Nguyen & Kojima, sp. nov. <p>(Figs 65–69, 81, 82)</p> <p> <i>Parapolybia indica indica</i> (?): van der Vecht 1966: 29, part.</p> <p> <b>Diagnosis.</b> This species is similar in the external morphology to <i>P. i n di c a</i> and <i>P. c ro c ea</i> <b>sp. nov.</b>, but can be easily distinguished from the latters by the female vertex behind the posterior ocelli sloping down to the occipital carina after a narrower flat area.</p> <p> <b>Type material.</b> HOLOTYPE: ♀, VIETNAM: Mai Chau, Pa Co, Hoa Binh Prov., 20°44.5'N, 104°53.5'E, ca. 1450 m, 27.viii.2006, L.T.P. Nguyen, F. Saito & J. Kojima, nest# VN-Pp- 2006-16 ” [IUNH, long-term loan from IEBR]. PARATYPES: VIETNAM: Hoa Binh: 7 ♀ with same data as holotype [IEBR, IUNH].</p> <p> <b>Description.</b> FEMALE. Body length about 14.0 mm; fore wing length 12.5–14.0 mm. Head in frontal view 1.1 × as wide as high (Fig. 65). Gena barely swollen laterally, in frontal view of head invisible (Fig. 65), in lateral view 0.7 × as wide as eye (Fig. 66). Vertex behind posterior ocelli sloping down to occipital carina after narrow flat area (Fig. 82). Ocelli close to each other (Fig. 67); distance between anterior and posterior ocelli shorter than Od; POD less than their Od; anterior ocellus diameter 0.25 mm, Od 0.20 mm; OOD 2.0 × as large as Od. Propodeum with fine shallow transverse striae in anterior one third, striation stronger and deeper posteriorly. T1 thin and long (about 3.8 mm long, Figs 68–69), 3.5 × longer than the maximum height, 3.0 × as long as its own maximum width.</p> <p> <i>Color.</i> Similar to <i>P. crocea</i>, but ambiguous paired brown spots on clypeus and metasoma distinctly darker (Fig. 81) as follows: segments 2–6 brown to dark brown, with paler colored lateral spots on T2.</p> <p>MALE. Unknown.</p> <p> <b>Etymology.</b> The specific name originates from a Latin <i>nanus</i> with reference to the appearance. <b>Distribution.</b> Vietnam (North Vietnam).</p>Published as part of <i>Saito-Morooka, Fuki, Nguyen, Lien T. P. & Kojima, Jun-Ichi, 2015, Review of the paper wasps of the Parapolybia indica species-group (Hymenoptera: Vespidae, Polistinae) in eastern parts of Asia, pp. 215-235 in Zootaxa 3947 (2)</i> on pages 229-230, DOI: 10.11646/zootaxa.3947.2.5, <a href="http://zenodo.org/record/232726">http://zenodo.org/record/232726</a>
Real Options Applied To Selection Of Technological Alternative For Offshore Oilfield Development
No full textThe future outcome of a project is not usually predictable, and therefore uncertainty plays an important role into the process. Current economic models that support decision-making process are not always capable of indicating and accounting for the benefits of flexible field development plans. One way to resolve this is to add real options valuation (ROV) into the economic model and to expand the decision-making process to accommodate this technique. The work presented on the paper describes a methodology that incorporates ROV into the analysis of different field development alternatives for deepwater. Examples are presented in this paper to demonstrate that there is a difference in the total value of the projects when flexibility is accounted for. It is also highlighted the different manners that flexibility contributes to the project value and how to model a field development plan in order to analyse its flexibility.21752179Trigeorgis, L., (1996) Real Options - Managerial Flexibility and Strategy in Resource Allocation, p. 427. , MIT Press, Cambridge, MADezen, F., Morooka, C., Adding Real Options Value To Decision Analysis (2000) Rio Oil & Gas Conference, , Conference held in Rio de Janeiro, Brazil, October. Paper IBP 19700Dezen, F., Morooka, C., Alternatives for Deepwater Field Developments: A Real Option Approach (2002) Offshore Technology Conference Held in Houston, USA, , 6-9 May, paper OTC 14205Dezen, F., Morooka, C., Field Development Decision Making Under Uncertainty: A Real Option Valuation Approach (2001) Spe Latin American And Caribbean Petroleum Engineering Conference Held in Buenos Aires, Argentina, , 25-28 March, paper SPE 6959
Parapolybia flava Saito-Morooka, Nguyen & Kojima, sp. nov.
No full text<i>Parapolybia flava</i> Saito-Morooka, Nguyen & Kojima, sp. nov. <p>(Figs 41–52, 80, 86)</p> <p> <i>Parapolybia indica indica</i> (?): van der Vecht 1966: 29, part.</p> <p> <b>Diagnosis.</b> This species can be distinguished from other species of the <i>P. i n di ca</i> species-group by the combination of the following characters: female gena well developed, swollen posterolaterally; in both sexes, T2 distinctly concave on both sides of median line.</p> <p> <b>Type material.</b> HOLOTYPE: ♀, VIETNAM: Thanh Cong, Nguyen Binh, Cao Bang Prov., 22°32.5'N, 105°52'E, 700 m, 7.viii.2012, J. Kojima & H. Nugroho, nest# VN-NE2012-Pp-10” [IUNH, long-term loan from IEBR], PARATYPES: VIETNAM: Cao Bang: 7 ♀ 2 ♂ [IUNH], Thanh Cong, Nguyen Binh, J. Kojima & H.</p> <p>Nugroho, [5 ♀ 2 ♂, 22°32.5'N, 105°52'E, 700 m, 7.viii.2012, nest# VN-NE2012-Pp-10; 3 ♀, 22°34'N, 105°52.5'E, 1000 m, 9.viii.2012, nest# VN-NE2012-Pp-11]; 6 ♀ [IUNH], Nguyen Binh, Thanh Cong, J. Kojima, H. Nugroho & IED-c [4 ♀, 22°34'N, 105°53'E; 1 ♀, 22°32.5'N, 105°52'E]; Bac Kan: 4 ♀ 1 ♂ [IUNH], Na Ri, 22°12'51''N, 105°58'42''E, 550 m, 5.viii.2012, J. Kojima & H. Nugroho, nest# VN-NE2012-Pp-09; Ha Tinh: 700 m, 30.v.2004, L.T.P. Nguyen.</p> <p> <b>Description.</b> FEMALE. Body length 15.0–18.0 mm; fore wing length 14.0– 15.5 mm. Head in frontal view 1.1 × as wide as high (Fig. 41). Gena developed, swollen laterally, in frontal view of head visible in its entire height (Fig. 41), in lateral view about as wide as eye (Fig. 42). Ocelli close to each other (Fig. 43); distance between anterior and posterior ocelli shorter than Od; POD less than their Od; anterior ocellus diameter 0.20–0.24 mm, posterior ocellus diameter 0.20–0.24 mm; OOD 2.0 × as large as Od. Propodeum finely and shallowly striate in anterior half, deeper posteriorly. T1 posteriorly swollen (4.0–5.0 mm long, Figs 44–45), 3.0 × longer than the maximum height, 3.0 × as long as its own maximum width. T2 distinctly depressed sublaterally (Fig. 46).</p> <p> <i>Color.</i> Body yellow (Fig. 80), with following parts brown to dark brown: dorsal part of scape, pedicel, basal half of flagellum (varying between individuals), paired ill-defined spots on clypeus, frons, vertex, anterior spot and line along posterodorsal margin of pronotum, median longitudinal band of mesoscutum, scutellum, tegula, median longitudinal band of propodeum, anterodorsal half of T1, anterior half of S1, S2–S6 except for dorsal yellow markings (remarkably varying in size and shape), basal spot of mid and hind femerora, basal half of mid and hind tibiae. Following parts black: anterior margin of clypeus, teeth of mandible, margin of ocelli, anterior margin and posterior line of mesoscutum, groove of mesopleuron, mid and hind tarsi.</p> <p>MALE. Body length about 13.0 mm; fore wing length 12.0 mm. Head in frontal view 1.1 × higher than wide (Fig. 47). Eye enlarged. Ocelli close to each other (Fig. 48); distance between anterior and posterior ocelli less than half of Od; POD about half of their Od; anterior ocellus diameter 0.24–0.26 mm, posterior ocellus diameter 0.22– 0.24 mm; OOD 1.3 × as Od. Antenna thin and long, F11 2.0 × as long as F10. T1 not robust (about 3.5 mm, Figs 49–50), 3.0 × longer than its maximum height, 3.0 × as long as its own maximum width. T2 distinctly depressed sublaterally (Fig. 46). Legs thin and long, hind tibia 4 mm. Volsella elongate. Digitus broadly bulged, strongly bend inward. Parameral spine short, with dense hairy setae (Fig. 51). Proximal margin of aedeagus ventrally produced (Fig. 52).</p> <p> <i>Color.</i> Body light yellow (Fig. 80); following parts light brown to orange: mesoscutum and scutellum; following parts brown to dark brown: dorsal part of scape, pedicel, dorsal side of flagellum (darker basally), frons, vertex, anterial mark and dorsolateral line of pronotum, median line and anterior margin of mesoscutum, median line of scutellum, median and dorsolateral lines of propodeum, groove on mesopleuron, dorsal mark of T1, T2 except for paired large yellow spots, tarsi.</p> <p> <b>Etymology.</b> The specific name originates from a Latin <i>flavus</i> with reference to the body coloration.</p> <p> <b>Distribution.</b> Vietnam (North Vietnam).</p>Published as part of <i>Saito-Morooka, Fuki, Nguyen, Lien T. P. & Kojima, Jun-Ichi, 2015, Review of the paper wasps of the Parapolybia indica species-group (Hymenoptera: Vespidae, Polistinae) in eastern parts of Asia, pp. 215-235 in Zootaxa 3947 (2)</i> on pages 225-227, DOI: 10.11646/zootaxa.3947.2.5, <a href="http://zenodo.org/record/232726">http://zenodo.org/record/232726</a>
Alternatives For Deepwater Field Developments: A Real Option Approach
No full textOption-pricing theory has moved from the financial markets mainstream to the decision making process for upstream projects in the petroleum industry, taking shape as Real Option Valuation (ROV) techniques. It is proposed herein to employ option-pricing theory for selecting the best alternative among different execution plans (or competitive technology) for an offshore oilfield development.18431847Copeland, T., Antikarov, V., (2000) Real Options - A Practitioner's Guide, p. 372. , Texere (Ed.)Newendorp, P.D., (1975) Decision Analysis for Petroleum Exploration, p. 668. , Planning PressPaddock, J., Siegel, D., Smith, J., Option valuation of claims on physical assets: The case of offshore petroleum leases (1988) Quarterly Journal of Economics, 103 (3), pp. 479-508Siegel, D.R., Smith, J.L., Paddock, J.L., Valuing Offshore Oil Properties with Option Pricing Models (1987) Midland Corporate Finance Journal, pp. 22-30. , SpringBrennan, M.J., Schwartz, E.S., Evaluating Natural Resource Investments (1985) Journal of Business, 58, pp. 135-157Brennan, M., Schwartz, E., A New Approach to Evaluating Natural Resource Investments (1985) Midland Journal of Corporate Finance, 3, pp. 78-88Leslie, K.J., Michaels, M.P., The Real Power of Real Options (1997) The McKinsey Quarterly, (3)Dias, M.A.G., The Timing of Investment in E&P: Uncertainty, Irreversibility, Learning, and Strategic Consideration (1997) SPE Hydrocarbon Economics and Evaluation Symposium, pp. 135-148. , Dallas 16-18 March, ProceedingsBeliossi, G., Option pricing of an oil company- the model and an empirical valuation Working Paper Dipartimento di Discipline Economico AziendaliDezen, F., Morooka, C., Adding Real Options Value to Decision Analysis (2000) Rio Oil & Gas Conference, , Conference held in Rio de Janeiro, Brazil, October. Paper IBP 19700Dezen, F., Morooka, C., Field Development Decision Making under Uncertainty: A Real Option Valuation Approach (2001) Spe Latin American and Caribbean Petroleum Engineering Conference, , held in Buenos Aires, Argentina, 25-28 March, paper SPE 69595Black, F., Scholes, M., The Pricing of Options and Corporate Liabilities (1973) Journal of Political Economy, 81, pp. 637-654Merton, R.C., Theory of Rational Option Pricing (1973) Bell Journal of Economics and Management Science, (4), pp. 141-183. , SpringTrigeorgis, L., (1996) Real Options - Managerial Flexibility and Strategy in Resource Allocation, p. 427. , MIT Press, Cambridge, M
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Mitomycin C in highly myopic eyes - Author reply
No full textOphthalmology. 2005 Feb;112(2):208-18; discussion 219.
Mitomycin C modulation of corneal wound healing after photorefractive keratectomy in highly myopic eyes.
Gambato C, Ghirlando A, Moretto E, Busato F, Midena E.
SourceRefractive Surgery Service and Antimetabolite Therapy Research Unit, Department of Ophthalmology, University of Padova, Padova, Italy.
Abstract
PURPOSE: To evaluate the role of topical mitomycin C in corneal wound healing (CWH) after photorefractive keratectomy (PRK) in highly myopic eyes.
DESIGN: Prospective, double-masked, randomized clinical trial.
PARTICIPANTS: Seventy-two eyes of 36 patients affected by high (>7 diopters) myopia.
METHODS: In each patient, one eye was randomly assigned to PRK with intraoperative topical 0.02% mitomycin C application, and the fellow eye was treated with a placebo. Postoperatively, mitomycin C-treated eyes received artificial tears (3 times daily, tapered in 3 months), whereas the fellow eye was treated with fluorometholone sodium 2% and artificial tears (3 times daily, tapered in 3 months).
MAIN OUTCOME MEASURES: Uncorrected visual acuity (UCVA) and best-corrected visual acuity (BCVA), contrast sensitivity, manifest refraction, and biomicroscopy. Contrast sensitivity was determined using the Pelli-Robson chart. Corneal confocal microscopy documented CWH.
RESULTS: Mean follow-up was 18 months (range, 12-36). No side effects or toxic effects were documented. At 12-month follow-up examination, UCVAs (logarithm of the minimum angle of resolution) were 0.4+/-0.48 and 0.5+/-0.53 (P = .03) in mitomycin C-treated eyes and corticosteroid-treated eyes, respectively. At 1 year, corneal haze developed in 20% of corticosteroid-treated eyes, versus 0% of mitomycin C-treated eyes. At 12, 24, and 36 months, corneal confocal microscopy showed activated keratocytes and extracellular matrix significantly more evident in untreated eyes (Ps = 0.004, 0.024, and 0.046, respectively).
CONCLUSION: Topical intraoperative application of 0.02% mitomycin C can reduce haze formation in highly myopic eyes undergoing PRK.
Comment in
Ophthalmology. 2006 Feb;113(2):357; author reply 357-8
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
A Multi-Language Comparison of Influences on Author Verification using Character N-Grams
No full textWe create a new multi-language corpus for author verification based on Wikipedia talkpages, and evaluate the influence that differences in topic and time have on character n-gram author profiles. Topic alignment between two texts is found to increase author verification precision, and an authors writing style is found to change over time, but not more significantly after 3 years than after 1 year.Information ArchitectureWISElectrical Engineering, Mathematics and Computer Scienc
A 0.12mm<sup>2</sup> Wien-Bridge Temperature Sensor with 0.1°C (3σ) Inaccuracy from -40°C to 180°C
No full text Resistor-based temperature sensors can achieve much higher resolution and energy efficiency than conventional BJT-based sensors [1], but they typically occupy more area (> 0.25 mm 2 ) and have lower operating temperatures (le 125 {circ} {C}) [2]-[4]. This work describes a 0.12mm 2 resistor-based sensor that uses a Wien-bridge (WB) filter to achieve 0.1 {circ} {C} (3 sigma) inaccuracy from - 40 {circ} {C} to 180 {circ} {C}. Compared to a state-of-the-art WB sensor [4], it occupies 6 × less area and achieves comparable relative accuracy over a 76% wider operating range. Session 10.3 Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Electronic InstrumentationMicroelectronic
A ±25A Versatile Shunt-Based Current Sensor with 10kHz Bandwidth and ±0.25% Gain Error from -40°C to 85°C Using 2-Current Calibration
No full textAccurate current sensing is critical in many industrial applications, such as battery management and motor control. Precise shunt-based current sensors have been reported with gain errors of less than 1% over the industrial temperature range (-40°C to 85°C) [1]–[4]. However, since they are intended for coulomb counting, their bandwidth is limited to a few tens of Hz, making them unsuitable for battery impedance or motor-current sensing. This paper presents a current sensor with a wide (10kHz) bandwidth and a tunable temperature compensation scheme (TCS), which allows it to be flexibly used with different types of shunts while maintaining high accuracy. A low-cost room-temperature calibration scheme is proposed to optimize gain flatness over temperature by exploiting the shunt's self-heating at large currents. Over the industrial temperature range and a ±25A current range, it achieves state-of-the-art gain error (±0.25%) with both low-cost PCB and stable metal-alloy shunts.Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Electronic InstrumentationMicroelectronic
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