170,620 research outputs found
The evolution of agricultural trade flows
Get PDFEarlier research showed that during the 1980s and 1990s most of the global agricultural trade expansion took place among the industrial countries and among countries within trade blocs. These were also periods of declining agricultural prices. These prices increased during the 2000s, there were continuous trade reforms, and many developing countries started to support their agricultural sectors. This paper analyzes trade flows during the past two decades, and tries to measure whether all these developments have changed the trade balances and the share of different groups within the global trade flows. In addition, it looks at the trade balances on food to see the impact of these changes on net food importing countries. In conclusion, unlike the case with manufacturing, developing countries have not been able to increase their export shares in agriculture as significantly. They have maintained their trade shares by primarily expanding exports to other developing countries.Emerging Markets,Food&Beverage Industry,Economic Theory&Research,Trade Policy,Free Trade
On the design of low-frequency filters using CMOS OTAs operating in the subthreshold
No full textDesign considerations on a circuit technique based on subthreshold operation of MOS transistors is described for the realization of low-frequency OTA-C active filters with small capacitance values of the order of 25-400 pF. The circuit technique described is applied to the beta@(13-40 Hz), delta@(1-4 Hz) band filters for EEG signals. Because of small capacitance values the filter circuit is suitable for realization on a single VLSI chip using the CMOS technology, and enables the user to implement the circuit on implantable biotelemetric applications. (Author abstract
Enformasyon Bilimlerine Fütüristik Bir Yaklaşım
Get PDFIn the Information Age, the amount of unique information created every year reaches a level high enough to fill the American Library of Congress 37,000 times and 92% of this bulk is recorded on magnetic media. For the upcoming younger generation, information recorded on paper is “out of coverage area.” They tend to reach information on the spot, via some intelligent informational agents. Thus, they think information that cannot be accessed in increasingly shorter periods of time is not worth accessing. Traditional functions, like presentation of information, trusted information storage, maintaining authenticity and conservation, expected to be fulfilled by information professionals, are becoming increasingly electronic focused, in parallel to the changing world. The level of technical information infrastructure required to fulfill these functions in an electronic environment, on the other hand, has reached a level that requires information sciences to turn into an “information engineering.” Setting out from these changes, this paper questions the ratio of technological aspects to be taught during the education of information professionals and concludes that the place that this education should take place should be reconsidered
Protection and industrial structure in India
Get PDFEffective protection rates in India are so high and vary so greatly that anything short of low uniform tariffs and the complete elimination of quantitative restrictions would not make the industrial incentive scheme transparent, as it needs to be. The authors produce evidence to show that there is ample scope for reducing tariffs and quantitative restrictions and that most industries could coexist with much less protection than they now have. By eliminating all surcharges on inputs (tariffs on imported inputs, price differentials on local inputs, nondeductible excise taxes) - even without correcting for the effects of high investment costs - most projects (including import substitution projects) would earn from current international prices a positive profit margin on their marginal as well as full production costs. The proportion of projects with a positive profit margin would triple, from 20 to 63 percent. Among import-substituting projects that are not candidates for export under the present trade regime, under the proposed new regime half would be candidates for export if they would procure their inputs at international prices. Lower tariffs would fulfill their primary purpose more effectively: providing protection and incentive signals. The function of generating public revenues, another critical issue in India, should be fulfilled not through tariffs but through more efficient and protection-neutral instruments - in particular direct taxation (income tax) and nontariff indirect taxation (neutral excise taxes, MODVAT, and preferably the value-added tax on consumption).Environmental Economics&Policies,Economic Theory&Research,Access to Markets,Markets and Market Access,Consumption
Microfabrication of capillary electrospray emitters and ToF characterization of the emitted beam
No full textMicrofabrication, assembly, and characterization of internally fed arrays ofelectrospray emitters for spacecraft propulsion are discussed. Several different emitter geometries were fabricated, and the sprayed beams from these emitters are characterized for their ion/droplet composition. It is shown that with smaller inner diameters, ionic mode of operation can be achieved more easily, due to the increase in the hydraulic impedance. Up to 2000 sIsp was measured from capillaries with 5μm inner diameter and 100μm with 750V extraction voltageusing EMI-BF4. Due to the small dimensions of the microfabricatedcapillaries, the onset and ionic mode operation voltages can be significantly lower than macroscopic emitters. The major failure mode for the emitters was the liquid overflow from the capillary tip, which can be resolvedthrough coatings that wet the ionic liquids differently. A detailed study of the wetting behavior of two ionic liquids is also presented for variousmaterials compatible with silicon microfabrication technolog
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDFWe 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
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