نتایج جستجو برای: switch sleeper

تعداد نتایج: 60866  

2011

Miles K (2011) Using attachment theory in mentoring. Nursing Times; 107:

The main design criteria of ballasted railway tracks include rail deflections, rail bending stresses, rail wheel contact stresses, sleeper bending moments and ballast sleeper contact pressures. Numerous criteria have been defined for the design of ballasted railway tracks owing to the various mechanical properties of track components and their complex interaction. Therefore, railway track desig...

2017
Seyed Morteza Shamshirgaran Jafar Ataei Ayyoub Malek Manochehr Iranparvar-Alamdari Nayyereh Aminisani

AIM To examine sleep quality and its determinants among people with type 2 diabetes mellitus (T2DM). METHODS This is a cross-sectional study conducted among diabetic patients referring to Ardabil diabetes clinic in Northwest of Iran. Information on sleep quality was collected using Pittsburg Sleep Quality Index (PSQI). A questionnaire was used to collect data on sociodemographic lifestyle fac...

2006
Jan Kleinnijenhuis Anita M. J. van Hoof Dirk Oegema

The role of the media in the creation of distrust is much debated in political communication. Will negative news, for example, relentless attacks on political authorities, result in political cynicism or in a stimulation effect? By and large the media may stimulate political participation,but it is less clear when negative news will nullify this effect. Negative news may not only have short-ter...

2005
Lars Jacobsson

A constitutive model based on plasticity theory with a non-associative flow rule has been developed. The model is formulated in terms of sleeper displacements and forces, and includes hardening and softening controlled by irreversible transversal (lateral and longitudinal) sleeper displacements. The model has been calibrated using results from lateral and longitudinal ballast resistance tests c...

Journal: :amirkabir international journal of electrical & electronics engineering 2015
m. hayati s. roshani

a new output structure for class e power amplifier (pa) is proposed in this paper. a series lc resonator circuit, tuned near the second harmonic of the operating frequency is added to the output circuit. this resonator causes low impedance at the second harmonic. the output circuit is designed to shape the switch voltage of the class e amplifier and lower the voltage stress of the transistor. t...

Journal: :Polymers 2021

A novel concept of polymer railway sleeper is proposed in this study that has the potential to meet static performance requirements within cost hardwood timber. The existing challenges composite sleepers, such as low or high cost, can be overcome using innovative concept. Such a proclamation proven through limit state design criteria and series experimentations. Results show polyurethane foam a...

Journal: :Revista da Escola de Enfermagem da U S P 2011
Mariana Alvina Dos Santos Diná de Almeida Lopes Monteiro da Cruz Ricardo Luís Barbosa

The objective of this study was to describe sleep patterns in patients with heart failure (HF) and analyze associations between sleep and the following variables: gender, age, fatigue, fatigue on exertion, physical activity, functional class, drug therapy, dyspnea, and body mass index. The nonprobability sample consisted of 400 patients (mean age 57.8 years; 64.8% were men, average schooling of...

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