Iran has great potential in utilizing solar energy. In order to maximize the amount of absorbed solar radiation to absorber surfaces, the surfaces should be installed at a suitable angle slope to the horizon that is discussed in this article. The calculations performed in this study was done using MATLAB software. In this study, radiation received on the ground in 31 provincial capitals of the ...

V-engines are subjected to noise and vibrations caused due to unbalanced inertial forces and moments, which makes its operation quite complicated. In order to minimize these vibrations, the unbalanced forces and moments are analyzed on a reciprocating engine for different V-angles. Firing order has a great influence on balancing of V-engine. This paper aims at making a major contribution for se...

slope instability due to landslides is particularly common in iran. it is possible to fight against these hazards thanks to the roots of trees, which provide an important contribu-tion towards the stability of hillslopes. however, our knowledge of the effectiveness of roots for slope stability needs improvement. therefore this study was carried out on the effect of tree roots on slope stability...

In this paper we discuss further properties of 2D correlation spectroscopy using the global phase angle intensity normalization method. The 2D global phase angle analysis method has been shown to discriminate against arbitrary signal amplitude changes not related to real correlation intensities. We have confirmed that the positive or negative sign of a global phase angle 2D correlation peak is ...

statement of problem: the gonial angle plays an important role in ensuring a harmonious facial profile. changes in this angle especially after surgery may be an aesthetic concern for both the patient and the surgeon. purpose: the aim of the present study was to evaluate gonial angle changes after mandiblular setback with the bssro technique and to measure postsurgical relapse two years after su...

Rock anisotropy plays an important role in engineering behavior of rocks. Slates are anisotropic rocks which have long been used for gable roof, floor tiles, borrow materials, and other purposes. The slates studied in this research are calcareous and have a porphyro-lepidoblastic texture. To determine the role of the anisotropy on the tensile strength and fracture pattern, two variables includi...

Numerous studies deal with insect attachment onto surfaces with different roughness; however, little is known about insect attachment onto surfaces that have different chemistry. In the present study, we describe the attachment structures of the water-lily leaf beetle Galerucella nymphaeae and test the hypothesis that the larval and adult stages generate the strongest attachment on surfaces wit...

This study evaluates the parameterization of the dependence of surface albedo on solar zenith angle (SZA) over snow-free land surface used by the National Centers for Environmental Prediction Global Forecast Systems (GFS) and those derived from the moderate resolution imaging spectroradiometer satellite observations as described in two recent studies. The influence of cloud cover on surface alb...

Adequate oral or intravenous doses of a betaadrenergic receptor-blocking drug, nethalide,' produce no significant changes in the resting oxygen consumption, heart rate, cardiac output, and systemic mean arterial or mean right atrial pressures of patients with spontaneous hyperthyroidism (1). These findings do not support the concept that the hemodynamic changes in hyperthyroidism are mediated t...