32,088 research outputs found
Metastable Innershell Molecular State (MIMS) IV: Heteronucleus K-shell MIMS with H+ and He+
No full textAbstractThe model of MIMS (Metastable Innershell Molecular State) has been applied to interpreting the Kα X-ray satellite data of target atoms in H+ and He+ ion impact on Al, Ca and Ti targets. The binding energies of the heteronucleus H-K-MIMS (K-shell MIMS formed with H and a target atom) and He-K-MIMS have been obtained. The binding energy trend of the H-K-MIMS shows a Z2 dependency similar to that of the homonucleus K-MIMS, while that of the He-K-MIMS shows a transitional behavior from the former to the latter. These behaviors were interpreted with the Z-expansion theory of heteronucleus molecules
Comparison of several author indices for gauging academic productivity
No full textBackground
Many author indices exist to gauge academic productivity. Several of these indices are calculated based upon an author's scholarly publication record, but the measurement methodology to calculate each index varies considerably, and the precise function being used, as well as the end result, is often complex and difficult to assess.
Method
Two straightforward methods to weigh author productivity from the publication and citation record were evaluated as possible means for providing a clearer assessment of scholarly activity. The author characteristic index (termed c-index) assigns author rank for each publication based upon author position. The characteristic prime (c') -index normalizes author rank from author position, so that the total weight per publication is unity. The top 10 scholars with keyword 'celiac disease' in the Google Scholar database were then assessed using these metrics. Rankings according to total number of publications, h-index, and c- and c'-indices were compared, then tabulated along with total papers included for assessment, and mean values per paper for author position, number of authors, citations, and year of publication.
Results
The order of the top ten authors with keyword 'celiac disease' varied substantially depending upon whether the h-index, c-index, or c'-index was used as a gauge. The characteristic indices assign credit to authors according to their position in an author list. The affiliated metrics provided a more complete picture of scholarly activity.
Conclusions
Academic achievement by scholars, based upon quantitative publication characteristics, has recently become of interest for evaluating job candidates, for determining work performance, and for bestowing awards and honors. The characteristic indices as described herein are readily calculated and interpreted, and may improve the assessment of scholarly activity
Direct optical transitions at K- and H-point of Brillouin zone in bulk MoS2, MoSe2, WS2, and WSe2
No full textabstract: Modulated reflectance (contactless electroreflectance (CER), photoreflectance (PR), and piezoreflectance (PzR)) has been applied to study direct optical transitions in bulk MoS[subscript 2], MoSe[subscript 2], WS[subscript 2], and WSe[subscript 2]. In order to interpret optical transitions observed in CER, PR, and PzR spectra, the electronic band structure for the four crystals has been calculated from the first principles within the density functional theory for various points of Brillouin zone including K and H points. It is clearly shown that the electronic band structure at H point of Brillouin zone is very symmetric and similar to the electronic band structure at K point, and therefore, direct optical transitions at H point should be expected in modulated reflectance spectra besides the direct optical transitions at the K point of Brillouin zone. This prediction is confirmed by experimental studies of the electronic band structure of MoS[subscript 2], MoSe[subscript 2], WS[subscript 2], and WSe[subscript 2] crystals by CER, PR, and PzR spectroscopy, i.e., techniques which are very sensitive to critical points of Brillouin zone. For the four crystals besides the A transition at K point, an A[subscript H] transition at H point has been observed in CER, PR, and PzR spectra a few tens of meV above the A transition. The spectral difference between A and A[subscript H] transition has been found to be in a very good agreement with theoretical predictions. The second transition at the H point of Brillouin zone (B[subscript H] transition) overlaps spectrally with the B transition at K point because of small energy differences in the valence (conduction) band positions at H and K points. Therefore, an extra resonance which could be related to the B[subscript H] transition is not resolved in modulated reflectance spectra at room temperature for the four crystals.This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. The following article appeared in Journal of Applied Physics and may be found at http://aip.scitation.org/doi/10.1063/1.4954157
[Letter from K. Okada to Mr. and Mrs. H. Natsumeda]
No full textA letter, written in Japanese from K. Okada in Murray, Utah to Mr. and Mrs. H. Natsumeda inside the Amache Incarceration Camp in Granada, Colorado. Item from Misao Okada’s album.Misao Okada’s scrapbook contains photographs, ephemera, notes, and correspondence documenting her time at Amache and a visit and reunion over 50 years later. The scrapbook also includes materials relating to reparations and events observing Japanese American incarceration
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
Letter from George H. Hand to Mr. K. Kodama concerning a claim of damages to crops. July 7, 1925
No full textSecond letter from George H. Hand requesting that Mr. K. Kodama make an appointment to come to his office to sign for a check paying for the damages that incurred to his crops by the Marland Oil Company. See related letter: Letter from Marland Oil Company to the Dominguez Estate Company regarding payout of a claim. July 10, 1924
Letter from George H. Hand to Mr. K. Kodama concerning a claim of damages to crops. July 16, 1924
No full textLetter from George H. Hand requesting that Mr. K. Kodama make an appointment to come to his office to sign for a check paying for the damages that incurred to his crops by the Marland Oil Company. See related letter: Letter from Marland Oil Company to the Dominguez Estate Company regarding payout of a claim. July 10, 1924
Control and Filtering for Discrete Linear Repetitive Processes with H infty and ell 2--ell infty Performance
No full textRepetitive processes are characterized by a series of sweeps, termed passes, through a set of dynamics defined over a finite duration known as the pass length. On each pass an output, termed the pass profile, is produced which acts as a forcing function on, and hence contributes to, the dynamics of the next pass profile. This can lead to oscillations which increase in amplitude in the pass to pass direction and cannot be controlled by standard control laws. Here we give new results on the design of physically based control laws for the sub-class of so-called discrete linear repetitive processes which arise in applications areas such as iterative learning control. The main contribution is to show how control law design can be undertaken within the framework of a general robust filtering problem with guaranteed levels of performance. In particular, we develop algorithms for the design of an H? and dynamic output feedback controller and filter which guarantees that the resulting controlled (filtering error) process, respectively, is stable along the pass and has prescribed disturbance attenuation performance as measured by and – norms
Agricultural policies in India
No full text"Since the early 1990s, India has undergone substantial economic policy reform and economic growth. Though reforms in agricultural policy have lagged those in other sectors, they have nonetheless created a somewhat more open economic orientation. In this study, we evaluate the protection and support versus disprotection of agriculture in India. Our methodology involves examining market price support (MPS) for eleven crops, the expenditures on input subsidies benefiting farmers (for fertilizer, electricity and irrigation), and product-specific and total producer support estimates (PSEs) over the period 1985-2002. We draw on the extensive price-comparison and subsidy-measurement data sets and analysis developed earlier by Gulati and his co-authors, often using disaggregated analysis for representative surplus and deficit states. This allows us to explore how key cost adjustments impact the results. Overall, our results indicate that support for agriculture in India has been counter-cyclical. Support for agriculture has been rising when world prices are low (as in the mid 1980s and 1998-2002) and falling when world prices are high (as in the early and mid 1990s). Our results demonstrate the increased importance of budgetary payments for input subsidies in agriculture in recent years. Yet, in the aggregate for both price support and budgetary expenditures over the period 1985-2002 the counter-cyclical dimension of agricultural policy dominates a clear trend of movement from disprotection towards protection. Using different variants of MPS and PSE measurment we have extended earlier analysis to demonstrate the impact of key assumptions on the calculations. These assumptions we argue are important to consider. For example, in the standard approach, the MPS for the covered commodities is “scaled up” based on the share of the covered commodities in the total value of production. If the commodity coverage is less than complete, as is often the case, the scaling up procedure leads to a total MPS of greater absolute value than the MPS for the covered commodities. This can result in PSEs of different sign than the non-scaled up version but is inappropriate unless market price support for the commodities not covered is similar to that of the covered commodities. Furthermore, we find that the standard procedure of computing the MPS through a comparison of the domestic price to an adjusted reference price based on observed imports or exports can be problematic. This happens when trade volumes are relatively small. In such a scenario a reference price based on observed imports or exports can lead to misleading conclusions. To address the reference price issue, we follow Byerlee and Morris (1993). Essentially the approach adopted is to compute the level of protection or disprotection based on a counterfactual reference price chosen on economic criteria i.e. the adjusted reference price that would exist in the country if the policy interventions were removed. The relevant price can either be the autarky equilibrium price or the import or export adjusted reference price depending on the relationship among these prices. We apply this modified procedure for six crops (wheat, rice, corn, sorghum, sugar and groundnuts). The choice of the crops is dictated by the fact that India has been near self-sufficiency and there have been changes in the direction of trade over the period of analysis. The magnitudes of estimated support for agriculture obtained in this paper are important for several reasons. The estimates confirm that high levels of subsidies were required for India to export wheat or rice in recent years, a conclusion reached by several other studies. However, we report less disprotection of Indian agriculture in the 1990s than in earlier studies. Partly this difference is explained by the modified procedure for choice of a reference price. A large component of this difference can be accounted for by whether or not the scaling up procedure is invoked. There are also fertile areas for future research. Estimates of adjustment costs used in domestic-to-border price comparisons, such as transportation and processing costs or marketing margins, are crucial variables in the analysis and merit being re-examined and further updated. Resolving what are the most reasonable assumptions about reference prices, or extending the analysis to additional crops and livestock to reduce uncertainty in future assessments will also contribute to fuller understanding of the net stance of policy toward agriculture and how it has evolved over time" Authors' AbstractSouth Asia ,South Asia and Central Asia ,Agricultural policy ,Producer Support Estimates (PSEs) ,Agricultural support ,Agricultural production ,Scaling up ,
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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