oalib

OALib Journal期刊

ISSN: 2333-9721

费用:99美元

投稿

时间不限

2019 ( 1 )

2018 ( 47 )

2017 ( 36 )

2016 ( 57 )

自定义范围…

匹配条件: “Luis;” ,找到相关结果约29474条。
列表显示的所有文章,均可免费获取
第1页/共29474条
每页显示
Introducing Engineering Students to Historical/Cultural Perspectives through Story-Centered On-Line Learning  [PDF]
Luis A Godoy
Creative Education (CE) , 2011, DOI: 10.4236/ce.2011.22009
Abstract: Several authors argued that history of science should be an integral part of science education; however, there are many obstacles to carry out an implementation within this approach, including that lecturers normally lack a necessary historical background (a situation that is largely aggravated in engineering faculties), and the impossi- bility of including new courses or credits in an already tight curriculum. The development of on-line modules that engineering students can work outside their normal schedule of classes, introducing historical/cultural per- spectives, is presented in this paper. E-learning and knowledge management strategies are used in the context of science education at undergraduate and graduate levels. The approach is based on learning-by-doing in a virtual environment, and specifically presents story-centered activities, in which the student is faced with a problem and plays the role of an expert to provide a solution to the case. The specific case considered develops in the form of a controversy concerning the origin of the studies of column buckling. Two sets of information are available for navigation in the module: specific information that the student can explore (containing historical material di- rectly connected to the case provided), and more general information (providing the historical/cultural context to the problem). A first application has been made with civil engineering students, who had to write a two-page white paper as a consequence of their work on the problem. The interest generated in the participating students and the positive evaluation of their experience seems to indicate that this type of activity can serve to enhance traditional engineering lectures by incorporating a historical dimension. The present web-based approach could be extended to tackle similar conflicts in fields for which there is ample documentation available in the literature or in other historical episodes which may lead to rich discussions.
Present Status of the Development and Application of Transparent Conductors Oxide Thin Solid Films  [PDF]
Luis Casta?eda
Materials Sciences and Applications (MSA) , 2011, DOI: 10.4236/msa.2011.29167
Abstract:

Luis Castañeda’s article, \"Present Status of the Development and Application of Transparent Conductors Oxide Thin Solid Films \", has been retraced by Ray Boxman because of plagiarism.


The scientific community takes a very strong view on this matter and we treat all unethical behavior such as plagiarism seriously. This paper published in Vol.2 No.9 1233-1242, 2011, has been removed from this site.

 

Processing Facilitation Strategies in OV and VO Languages: A Corpus Study  [PDF]
Luis Pastor, Itziar Laka
Open Journal of Modern Linguistics (OJML) , 2013, DOI: 10.4236/ojml.2013.33033
Abstract:

The present corpus study aimed to examine whether Basque (OV) resorts more often than Spanish (VO) to certain grammatical operations, in order to minimize the number of arguments to be processed before the verb. Ueno & Polinsky (2009) argue that VO/OV languages use certain grammatical resources with different frequencies in order to facilitate real-time processing. They observe that both OV and VO languages in their sample (Japanese, Turkish and Spanish) have a similar frequency of use of subject pro-drop; however, they find that OV languages (Japanese, Turkish) use more intransitive sentences than VO languages (English, Spanish), and conclude this is an OV-specific strategy to facilitate processing. We conducted a comparative corpus study of Spanish (VO) and Basque (OV). Results show (a) that the frequency of use of subject pro-drop is higher in Basque than in Spanish; and (b) Basque does not use more intransitive sentences than Spanish; both languages have a similar frequency of intransitive sentences. Based on these findings, we conclude that the frequency of use of grammatical resources to facilitate the processing does not depend on a single typological trait (VO/OV) but it is modulated by the concurrence of other grammatical features.

Past, Present and Future Climate of Antarctica  [PDF]
Alvarinho J. Luis
International Journal of Geosciences (IJG) , 2013, DOI: 10.4236/ijg.2013.46089
Abstract:

Anthropogenic warming of near-surface atmosphere in the last 50 years is dominant over the west Antarctic Peninsula. Ozone depletion has led to partly cooling of the stratosphere. The positive polarity of the Southern Hemisphere Annular Mode (SAM) index and its enhancement over the past 50 years have intensified the westerlies over the Southern Ocean, and induced warming of Antarctic Peninsula. Dictated by local ocean-atmosphere processes and remote forcing, the Antarctic sea ice extent is increasing, contrary to climate model predictions for the 21st century, and this increase has strong regional and seasonal signatures. Models incorporating doubling of present day CO2 predict warming of the Antarctic sea ice zone, a reduction in sea ice cover, and warming of the Antarctic Plateau, accompanied by increased snowfall.

An Extended Model of Currency Options Applicable as Policy Tool for Central Banks with Inflation Targeting and Dollarized Economies  [PDF]
Luis-Felipe Arizmendi
Theoretical Economics Letters (TEL) , 2013, DOI: 10.4236/tel.2013.33027
Abstract:

The purpose of this paper is to provide a new set of tools for policy makers at central banks. Based on the Garman-Kohlhagen [1] formula for currency options, this research extends it with the Taylor-rule expression used for inflation targeting, thus obtaining the corresponding Call and Put options and the first and higher-degree partial derivatives known as “Greeks” for key variables such as the policy target domestic interest rate and the output gap.

New Evidence on Rotational Dynamics  [PDF]
Luis Alberto Pérez
World Journal of Mechanics (WJM) , 2013, DOI: 10.4236/wjm.2013.33016
Abstract:


In this paper, the author confirmed a new theory to explain the mechanical behavior of macroscopic bodies. The confirmed hypothesis is the Theory of Dynamics Interaction by the Professor Gabriel Barceló. Barceló explained his theory in an article called “Analysis of Dynamics Fields in Noninertial Systems”, World Journal of Mechanics, Vol. 2, No. 3, 2012, pp. 175-180. This hypothesis holds that the mechanical behavior of macroscopic bodies in a non-inertial environment opens new assumptions on inertial fields and rotational dynamics. An associated experiment was presented to support the discussion in the paper. The author first became aware of the proposals of Professor Gabriel Barceló’s Theory of Dynamics Interaction through his 2006 article on Saturn planet rings, which suggested unsolved phenomena in rotational dynamics and the inception of a novel theory [1]. Intuitively, the author realized himself about the fact that the cosmos is mechanical from its smallest to its widest comprehensible appreciation. If material behavior is mechanical everywhere and every time, from a subatomic particle, wave or string, to a cluster of galaxies, then our understandable solutions must comply with the Laws of Motion, it could be believed.


The Cardiovascular Benefits of Polyphenol Compounds  [PDF]
Anthony San Luis
Advances in Anthropology (AA) , 2013, DOI: 10.4236/aa.2013.34025
Abstract:

In comparison, polyphenols are one of the most diverse to most other groups of bioactive phytochemicals. Polyphenols can be found in a wide range of foods that are derived from plants. Polyphenols are made up of various subgroups, but it’s the phenolics, stillbenes, and flavonoids that engender positive impacts on cardiovascular health. These three phytochemical compounds can reduce cardiovascular conditions such as hypertension and coronary heart disease. Remarkably, polyphenols and its subgroups can be found ubiquitously in most human diets. As a result, many studies have effectively illustrated the positive impacts polyphenols can induce when processed by the human body. Furthermore, research efforts have shown that modern diets and more “traditional” diets have unknowingly promoted the consumption of foods rife with polyphenols. These findings are starting to be incorporated into the public health discipline as a more practical option for more sustainable nutritional interventions. In all, polyphenols can produce a myriad of positive developments on at the micro and macro level.

Trends and Interannual Variability of Winds and Turbulent Heat Flux in the Indian Ocean Sector of Southern Ocean during 2000-2009  [PDF]
Alvarinho J. Luis
Atmospheric and Climate Sciences (ACS) , 2014, DOI: 10.4236/acs.2014.42030
Abstract: Using satellite-based wind and sea surface temperature (SST) observations, linear trend and inter-annual variability of wind stress, turbulent heat flux (Q) and wind stress curl are addressed for the Indian Ocean sector of the Southern Ocean (ISO, 0°E - 155°E) for the period 2000-2009. The analysis reveals that spatial mean of Q varies between 70 and 73 Wm-2 in the austral summer and winter, respectively, while the mean wind stress is nearly same at 0.22 Nm-2 for both seasons. The anticyclonic curl dominates the ISO, which increases from 0.15 × 10-7 to 0.35 × 10-7 Nm-3 during the austral summer. The detrended box-mean time series of Q, wind stress, and wind stress curl exhibits a decreasing trend of –6.3 ± 1.6 Wm-2·decade-1, -0.012 ± 0.004 Nm-2·decade-1 and -0.48 ± 0.6 × 10-8 Nm-3·decade-1, respectively. The Empirical Orthogonal Function (EOF) analysis was carried out to study inter-annual variability. EOF-1 of Q captures 25% of the total variance, which mimics the austral summer pattern; its time coefficient is highly and negatively correlated with a 2-month lagged Nino3.4 SST index (r =-0.8 at 95% confidence). EOF-1 of wind stress accounts for 35% of the total variance and its time coefficient is strongly correlated with the Antarctic Oscillation (r= 0.86 at 95% confidence). EOF-1 of wind stress curl captures 15% of the total variance; its time coefficient is correlated to the Nino3.4 SST index (r= 0.65 at 95% confidence) with the former lagging the latter by two years. The repercussions of the weakening trends of the climatic parameters on
Variations of the origin of collateral branches emerging from the posterior aspect of the brachial plexus
Luis Ballesteros, Luis Ramirez
Journal of Brachial Plexus and Peripheral Nerve Injury , 2007, DOI: 10.1186/1749-7221-2-14
Abstract: The anatomy of brachial plexus structures from 46 male and 11 female cadaverous specimens were studied. The 40–80 year-old specimens were obtained from the Universidad Industrial de Santander's Medical Faculty's Anatomy Department (dissection laboratory). Parametric measures were used for calculating results.Almost half (47.1%) of the evaluated plexuses had collateral variations. Subscapular nerves were the most varied structure, including the presence of a novel accessory nerve. Long thoracic nerve variations were present, as were the absence of C5 or C7 involvement, and late C7 union with C5–C6.Further studies are needed to confirm the existence of these variations in a larger sample of cadaver specimens.Brachial plexus (BP) anatomical variations have been described in humans by many authors, although such variations have not been extensively catalogued [1-4]. Variations in plexus patterns may be due to unusual formation during the development of trunks, divisions, or cords [5]. The more common BP variations occur at the junction or separation of the individual parts [6,7]. Peripheral (collateral) nerves arise from the whole plexus trajectory. These collaterals reach proximal regions exclusively innervating some scapular belt muscles.Anesthetic blocks, surgical approaches, the interpretation of a nervous compression having unexplained clinical symptoms (sensory loss, pain, wakefulness and paresis), and these structures being compromised represent the clinical importance of these variations [8,9]. Dorsal scapular, long thoracic, suprascapular, subscapularis and thoracodorsal origins were studied to show variable BP collateral arrangements.BP structures from 46 male and 11 female mixed-race, cadaverous specimens (40–80 years old) were studied. These specimens were obtained from the Medical Faculty's Department of Anatomy (dissection laboratory) at Universidad Industrial de Santander during academic semesters in 2005 and 2006. The cause of death for each cadaver was
Possible implications of an accessory abductor digiti minimi muscle: a case report
Luis Ballesteros, Luis Ramirez
Journal of Brachial Plexus and Peripheral Nerve Injury , 2007, DOI: 10.1186/1749-7221-2-22
Abstract: This case report presents a bilateral variation of an accessory abductor digiti minimi muscle in a male specimen. Ulnar artery and ulnar nerves were taken into account regarding their position and trajectory related to this variation.Muscle size may be an important factor in considering whether a variation is able to produce neurovascular compression and clinical implications.This case report presents an abductor digiti minimi (ADM) muscle's bilateral accessory head, involving ulnar artery (UA) and ulnar nerve (UN) trajectories' sensorial and motor components. Although muscular, vascular and nervous variations of the hypothenar eminence are rare (differing from anomalous muscles in the wrist), they have been reported [1-10]. According to Sheppard, three cases of accessory ADM were first reported by Wood in 1868. Most authors call such additional ADM head an "accessory" component which can be unilaterally or bilaterally presented, producing compression in Guyon's canal. Harvie et al., found an accessory ADM in 41% of 116 volunteers' asymptomatic ultrasound examinations, greater prevalence being found in male samples and bilateral presentation in 50% of cases for both genders.The flexor digiti minimi brevis muscle can also be present in this area; Madhavi et al., have stated that it relates to the common phylogeny of these muscles from the same muscle mass [11]. Soldado-Carrera et al., found this variation to be associated with decreased flexor digitorum superficialis muscle fourth tendon caliper and median nerve split. Murata [7] found an accessory ADM in 35 hands, having one (17%), two (80%) and three fascicles (3%). Furthermore, Wulle [8] presented eleven cases of accessory ADM, but having "longus" presentation.This case report arises from one cadaver specimen amongst a sample of thirty which were obtained from Universidad Industrial de Santander's Medical Faculty's Anatomy Department (dissection laboratory) during 2006 academic semesters. The specimen was fixed in
第1页/共29474条
每页显示


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.