oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 1 )

2018 ( 13 )

2017 ( 20 )

2016 ( 25 )

Custom range...

Search Results: 1 - 10 of 834 matches for " regions "
All listed articles are free for downloading (OA Articles)
Page 1 /834
Display every page Item
Photoionization Modelling of H II Region for Oxygen Ions  [PDF]
S. Belay Goshu, Derck P. Smits
Journal of Materials Science and Chemical Engineering (MSCE) , 2015, DOI: 10.4236/msce.2015.34002
Abstract: We present phoionization model calculations of ionization fraction of hydrogen, helium and oxy-gen at low density of photoionized nebulae using the photoionization code CLOUDY. The ionization parameter is between -2.0 ≤ log(U) ≤ 1.0, and we study them by changing the abundances of oxy-gen from -2.5 ≤ log(O/H) ≤ -5.0. This was tested first by Campbell (1988) [1]. But, this was differ-ent in highest abundances of oxygen, filling factor and carbon abundances. We change the abun-dances of carbon by 0.5 dex of solar value, to avoid formation CO in the process. We include the charge transfer interaction between oxygen ions and hydrogen atom. Based on this process, we have calculated the ionization profiles of O0, O+, O2+ O3+ and O4+ in the presence and absence of charge exchange between hydrogen and oxygen. In this work, we assumed the effective rate of co-efficient for the charge transfer is the order of ≈10-9 cm-3-s-1.
GROWTH AND DECLINE OF URBAN AREAS IN ROMANIA
Daniela ANTONESCU,Florina POPA
Revista Romana de Economie , 2012,
Abstract: The urbanisation process in Romania followed a variable growth trajectory (that intensified), stagnation and, in the last period, a slightly decreasing trend. Thus, the years between the sixties to the nineties were characterised by marked development, concomitantly with population increase in small- and medium-sized towns. After the year 1990, the developments were different from one urban area to another: some succeeded in adjusting quicker to the new conditions; others were overwhelmed by the new town status. Currently, they are facing a series of problems triggered both by internal factors (urban agglomeration, pollution, built-environment deterioration, decrease in living standards quality, etc.), and external ones (EU integration, globalisation, financial crisis, etc.).Currently, urban areas draw increasingly more attention due to their important potential and to the role played in the current integration and economicand social cohesion process. The present article intends to capture the urbanisation process evolution in Romania and to identify current difficulties and opportunities confronting these areas.
Parasitoids of dipterous collected in cattle dung in the Regions Southern and Central of Goiás, Brazil  [PDF]
Carlos Henrique Marchiori, Ligia Miranda Ferreira Borges, Lorena Lopes Ferreira
Advances in Entomology (AE) , 2014, DOI: 10.4236/ae.2014.21004
Abstract: This study had the objective of determining the species of parasitoids of Diptera from May 2003 to June 2004 in the Region Southern and from March 2012 to February 2013 in the Region Central of (Goiania) Goiás, Brazil. The dipterous pupae were obtained by the flotation method. They were individually placed in gelatin capsules until the emergence of the flies and/or their parasitoids. The percentage of parasitism in the Region South was 12.4% and in the Region Central was 6.4%. The species more frequent were: Gnathopleura quadridentata Wharton, 1986 (Hymenoptera: Braconidae) with 25.6% in the Region Southern and Aleochara notula Erichson, 1839 (Coleoptera: Staphylinidae) with 26.1% in the Region Central.
Element Composition of the Atmospheric Depositions in Bangladesh  [PDF]
Jatish Chandra Biswas, Md Mozammel Haque, Mahmuda Akter, A. T. M. Sakhawat Hossain, Faruk Hossain Khan, Md Zakaria Ibne Baki, Abu Bakar Siddique Sarker, Md Rafiqul Islam
Journal of Environmental Protection (JEP) , 2018, DOI: 10.4236/jep.2018.99059
Abstract: Compositions of dry and wet atmospheric depositions vary depending on geographic locations and industrialization. Fog waters were collected from different regions of Bangladesh along with rain, sub-surface irrigation water and dust particles from Gazipur and compositions were analyzed. The compositions of fog water varied greatly among locations. The ammonium nitrogen (NH+4-N) content was the highest (36 - 37 ppm) in Gazipur district and the lowest in Sylhet district (3.2 - 3.6 ppm). Phosphorus (5.2 - 5.5 mg/L), K (29.5 - 30 mg/L), S (11.0 - 11.5 mg/L), Zn (2.9 - 3.3 mg/L), Na (11.7 - 12.5 mg/L), Ca (22.0 - 23.3 mg/L) and Cd (0.14 - 0.17 mg/L) contents were also higher in Gazipur district. Dust particles, rain and sub-surface irrigation water of Gazipur district contained considerable amounts of macro and micro elements. We conclude that dry and wet atmospheric depositions varied depending on locations and industrial development. Such study needs to be correlated with ecological consequences and soil fertility management.
Spatiotemporal Distribution of Precipitation Recycling across the Arid Regions of Asia and Africa  [PDF]
Jiamin Li, Ruirui Si
Journal of Geoscience and Environment Protection (GEP) , 2018, DOI: 10.4236/gep.2018.69015
Abstract: The degree of water vapour recycling in terrestrial precipitation is still a debatable topic, particularly in arid regions. Here, the spatiotemporal evolution of evaporation, calculated via the water balance method [1], and the precipitation recycling ratio, calculated using a water recycling model [2], are investigated across Asia and Africa for the 1984-2013 time period. The results show that the precipitation recycling ratio in North Africa and China-Mongolia is stronger in summer but weaker in winter. However, it is stronger in winter and spring in West Asia but weaker in summer. Evaporation accounts for a small proportion of the precipitation uptake in arid regions, with external water vapour transportation exerting the primary influence on precipitation recycling. Increasing global temperatures and evaporation potentials over the past 30 years have driven the actual evaporation and precipitation recycling ratio increases in North Africa and West Asia and corresponding decreases in China-Mongolia.
Comparing European Regions
Enrico Marelli,Marcello Signorelli
The European Journal of Comparative Economics , 2007,
Abstract: Guest Editors' introduction to the special issue on "European Regions"
Trans-Border Regions in the System of the Regional Hierarchy: the Systemic Approach
Fedorov M.,Korneevets V.
Baltic Region , 2009, DOI: 10.5922/2079-8555-2009-2-3
Abstract: The article positions trans-border regions that are formed in the course of cooperation between the administrative, territorial and municipal institutions of neighbouring countries or have similar important characteristics, in the hierarchical system of regions. The authors prove trans-border regions to be a type of international regions and consider specific characteristics of these regions using the Baltic region as an example.
Dirichlet Regions and Perfect Codes in Additive Channel  [PDF]
Garib Movsisyan
Open Journal of Discrete Mathematics (OJDM) , 2013, DOI: 10.4236/ojdm.2013.33025
Abstract:

In the present work, the class of metrics connected with subsets of the linear space on the field, GF(2), is considered and a number of facts are established, which allow us to express the correcting capacity of codes for the additive channel in terms of this metrics. It is also considered a partition of the metric space, Bn, by means of D-representable codes. The equivalence of D-representable and the perfect codes in the additive channel is proved.

Bone Pathology: Osteopoikilosis  [PDF]
Tolga Tolunay, Arslan Kaan Arslan, Izzet Bingol, Vedat Bicici, Mehmet Eren, Cheikh Moustapha Mohamed Lemine, Kasim Kilicarslan
Open Journal of Orthopedics (OJO) , 2013, DOI: 10.4236/ojo.2013.35040
Abstract: Osteopoikilosis is a rare benign sclerotic bone dysplasia. The disease which usually develops asymptomatically is coincidentally diagnosed with direct radiographs. Our subject, a 52-year-old male was admitted to our policlinic two days ago due to turning of his left ankle causing pain and swelling on his left ankle. We asked for bilateral direct radiograph of left ankle. The left ankle radiograph indicates multiple, small oval/round hyperdense sclerotic regions. As a result of available clinical finding and radiological viewing, the patient was diagnosed with osteopoikilosis.
HEIs-Regions Engagement Using Knowledge Management Strategy  [PDF]
Milly Perry
Modern Economy (ME) , 2014, DOI: 10.4236/me.2014.57068
Abstract:

Historically, the higher education system was the first knowledge industry. Today however, it no longer stands alone, but is one knowledge industry among many. Now, more than ever before, there is a stronger cooperation between the academia and industry, due to interdisciplinary activities, and because R & D activities are not limited to universities, but performed by industry too. Thus, new knowledge is created not only in universities and research institutes, but also in industry. Also, the implementation of knowledge develops not only in industry, but also within the academia. This means that the boundaries between industrial and academic research have been blurred. However, in spite of this fact, we still have not witnessed the breakthrough that we have been anticipating so keenly. It is highly important that policy leaders and decision makers in both the academia and industry should use “knowledge tools” for better communication between them. In industry, the tremendous value of knowledge strategy for business sustainability has already been realized. But while knowledge management tools that are suited to the current knowledge world have been implemented in industry for some time now, universities have not yet done so.

Page 1 /834
Display every page Item


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