oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Search Results: 1 - 10 of 4661 matches for " Wolfgang Rid "
All listed articles are free for downloading (OA Articles)
Page 1 /4661
Display every page Item
Human Dimensions Approach towards Integrating Sustainable Transportation and Urban Planning Policies: A Decision Support System (DSS) Based on Stated Preferences Data  [PDF]
Wolfgang Rid
Theoretical Economics Letters (TEL) , 2017, DOI: 10.4236/tel.2017.74059
Abstract: While a lot of progress has been made in Germany to reduce CO2 emissions in the past years in almost all sectors of economy, however, the sector of transportation shows increasing CO2 emissions in the same period of time. Likewise, sustainability objectives of German land use policies have not been met so far, especially with regard of the continuously high rate of greenfield land used up for new housing development. In this paper, it is argued that environmental issues of both sectors have to be addressed by integrating urban housing development and transportation infrastructure planning policies. The paper reports on a stated preferences survey among house buyers in Germany, using a discrete choice approach, where parameters of sustainable urban design and sustainable transport are both integrated into one model. Building on concepts of behavioral economics, preferences are elicited for sub-samples of different “environmental awareness”. Results show differences in tastes for higher building densities to reduce land consumption as well as differences in tastes for transport infrastructure development and frequency of public transport parameters. In addition, a decision support system is developed to analyze the impact of individual parameters on choosing one alternative over the other. Form this, conclusions on potential market shares for sustainable housing and transport development are drawn and recommendations are given to implement integrated urban design and transportation infrastructure policies.
RURAL TOURISM OFFER AND LOCAL COMMUNITY PARTICIPATION IN THE GAMBIA
Ikechukwu O. Ezeuduji,Wolfgang Rid
Tourismos : an International Multidisciplinary Journal of Tourism , 2011,
Abstract: Locals have been objects rather than drivers of rural tourism development in The Gambia and therefore have no direct benefits from tourism. This study used in-depth and focus group interviews to identify and analyse the internal and external driving forces that influence rural tourism development in The Gambia. Rural tourism development in The Gambia will require a clear value position, operational excellence and strong customer relations to gain a market leadership that offers the nation a competitive advantage. The results can be used to help rural tourism stakeholders with locals at the core, to collaborate and manage this development proactively and retain revenue generated from tourism within rural communities. One suggestion made from the results of this study is to encourage locals to stage events that will lead to establish unique rural tourism experience which could in turn lead to securing a brand identity in the rural tourism marketplace.
LiDy(PO3)4
Fathia Chehimi-Moumen,Mokhtar Férid
Acta Crystallographica Section E , 2008, DOI: 10.1107/s1600536808016875
Abstract: Single crystals of lithium dysprosium polyphosphate, LiDy(PO3)4, were prepared by the flux method. The atomic arrangement is built up by infinite (PO3)n chains extending along the b axis. Dy3+ and Li+ cations alternate in the middle of four such chains, with Dy...Li distances of 3.54 (1) and 3.48 (1) . The DyO8 dodecahedra and LiO4 tetrahedra deviate significantly from the ideal geometry. Both Dy and Li occupy special positions (Wyckoff position 4e, site symmetry 2).
Preparation of lanthanum ferrite powder at low temperature
Andoulsi, R.;Horchani-Naifer, K.;Férid, M.;
Ceramica , 2012, DOI: 10.1590/S0366-69132012000100020
Abstract: single lanthanum ferrite phase was successfully prepared at low processing temperature using the polymerizable complex method. to implement this work, several techniques such as differential scanning calorimetry, x-ray diffraction, fourier transform infrared spectroscopy, scanning electron microscopy and bet surface area measurements were used. throw the obtained results, it was shown that steps of preparing the powder precursor and temperature of its calcination are critical parameters for avoiding phase segregation and obtaining pure lanthanum ferrite compound. thus, a single perovskite phase was obtained at 600 °c. at this temperature, the powder was found to be fine and homogeneous with an average crystallite size of 13 nm and a specific surface area of 12.5 m2.g-1.
Silver europium(III) polyphosphate
Mounir Ayadi,Mokhtar Férid,Bernard Moine
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809004085
Abstract: Europium(III) silver polyphosphate, AgEu(PO3)4, was prepared by the flux method. The atomic arrangement is built up by infinite (PO3)n chains (periodicity of 4) extending along the c axis. These chains are joined to each other by EuO8 dodecahedra. The Ag+ cations are located in the voids of this arrangement and are surrounded by five oxygen atoms in a distorted [4+1] coordination.
A new polymorph of Lu(PO3)3
Anis Bejaoui,Karima Horchani-Naifer,Mokhtar Férid
Acta Crystallographica Section E , 2008, DOI: 10.1107/s1600536808021995
Abstract: A new polymorph of lutetium polyphosphate, Lu(PO3)3, was found to be isotypic with the trigonal form of Yb(PO3)3. Two of the three Lu atoms occupy special positions (Wyckoff positions 3a and 3b, site symmetry overline{3}). The atomic arrangement consists of infinite helical polyphosphate chains running along the c axis, with a repeat period of 12 PO4 tetrahedra, joined with LuO6 octahedra.
LiHo(PO3)4
Emna Ben Zarkouna,Ahmed Driss,Mokhtar Férid
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809001767
Abstract: Lithium holmium(III) polyphosphate(V), LiHo(PO3)4, belongs to the type I of polyphosphates with general formula ALn(PO3)4, where A is a monovalent cation and Ln is a trivalent rare earth cation. In the crystal structure, the polyphosphate chains spread along the b-axis direction, with a repeat period of four tetrahedra and 21 internal symmetry. The Li and Ho atoms are both located on twofold rotation axes and are surrounded by four and eight O atoms, leading to a distorted tetrahedral and dodecahedral coordination, respectively. The HoO8 polyhedra are isolated from each other, the closest Ho...Ho distance being 5.570 (1) .
On the Modal and Non-Modal Model Reduction of Metallic Structures with Variable Boundary Conditions  [PDF]
Wolfgang Witteveen
World Journal of Mechanics (WJM) , 2012, DOI: 10.4236/wjm.2012.26037
Abstract: Vibration mode based model reduction methods like Component Mode Synthesis (CMS) will be compared to methods coming from control engineering, namely moment matching (MM) and balanced truncation (BT). Conclusions based on the theory together with a numerical demonstration will be presented. The key issues on which the paper is focused are the reduction of metallic structures, the sensitivity of the reduced model to varying boundary conditions, full system response, accurate statics and the possibility to determine “a priori” the number of needed modes (trial vectors). These are important topics for the use of reduction methods in general and in particular for the implementation of FE models in multi body system dynamics where model reduction is widely used. The intention of this paper is to give insight into the methods nature and to clarify the strengths and limitations of the three methods. It turns out, that in the considered framework CMS delivers the best results together with a clear strategy for an “a priori” selection of the modes (trial vectors).
Sequences and Limits  [PDF]
Wolfgang Mueckenheim
Advances in Pure Mathematics (APM) , 2015, DOI: 10.4236/apm.2015.52007
Abstract: It is widely held that irrational numbers can be represented by infinite digit-sequences. We will show that this is not possible. A digit sequence is only an abbreviated notation for an infinite sequence of rational partial sums. As limits of sequences, irrational numbers are incommensurable with any grid of decimal fractions.
Prevalência de fatores de risco para doen as cardiovasculares em hipertensos cadastrados em unidade de saúde da família = Prevalence of risk factors for cardiovascular diseases among people with hypertension enrolled in a family health unit
Edmarlon Girotto,Selma Maffei de Andrade,Marcos Aparecido Sarriá Cabrera,Eliane das Gra?as Rid?o
Acta Scientiarum : Health Sciences , 2009,
Abstract: As doen as cr nicas n o-transmissíveis, em especial as doen ascardiovasculares, têm-se revelado como importante causa de morbimortalidade no Brasil, principalmente na área urbana. Estes agravos apresentam inúmeros fatores de risco, entre os quais s o reconhecidos a hereditariedade, a idade, a ra a, o sexo, a hipertens o arterial, o tabagismo, as dislipidemias, a diabetes, a obesidade e o sedentarismo. Este estudo buscou estimar a prevalência de alguns fatores de risco para doen as cardiovasculares em indivíduoshipertensos, de 20 a 79 anos, cadastrados em uma Unidade de Saúde da Família de Londrina, Estado do Paraná. Os dados foram coletados em entrevista domiciliar, com quest es referentes a aspectos socioecon micos e demográficos, estilo de vida e condi o desaúde. Entre os 385 pacientes entrevistados, foram observadas as seguintes prevalências: 28,6% com colesterol elevado; 16,9% de tabagistas; 5,5% de consumidores regulares de bebidas alcoólicas; 70,4% que n o praticavam atividade física; 22,9% com diabetes; e 30,9%com história familiar de doen as cardiovasculares. Observou-se elevada prevalência de fatores de risco cardiovasculares, especialmente a inatividade física. O manejo adequado destes fatores com medidas educativas e preventivas é fundamental para a redu o dascomplica es cardiovasculares no grupo de pacientes hipertensos. Non-transmissible diseases, particularly cardiovascular diseases, have emerged as important causes of morbidity and mortality in Brazil, mainly in urban areas. Heredity, age, race, gender, high blood pressure and lipids, smoking, diabetes, obesity and physical inactivity are recognized risk factors for these events. This study aimed to estimate the prevalence of some risk factors forcardiovascular diseases among hypertensive patients aged 20 to 79 years who had been enrolled in a Health Family Unit in Londrina, Paraná State, Brazil. Data was collected during home interviews, with questions about demographic and socioeconomic aspects, lifestyle and health condition. Among the 385 interviewed patients, the followingprevalence rates were observed: 28.6% of raised blood cholesterol; 16.9% of smoking; 5.5% of regular use of alcoholic beverages, 70.4% of physical inactivity; 22.9% of diabetes and 30.9% of family history of cardiovascular disease. A high prevalence of risk factors wasobserved, particularly physical inactivity. Adequate management of these risk factors with preventive and educative measures is essential to reduce cardiovascular complications in this group of hypertensive patients.
Page 1 /4661
Display every page Item


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