We investigate the role of market transparency in repeated first-price auctions. We consider a setting with independent private and persistent values. We analyze three distinct disclosure regimes regarding the bid and award history. In the minimal disclosure regime each bidder only learns privately whether he won or lost the auction. In equilibrium the allocation is efficient and the minimal di...

In transformation optics, the space transformation is viewed as the deformation of a material. The permittivity and permeability tensors in the transformed space are found to correlate with the deformation field of the material. By solving the Laplace's equation, which describes how the material will deform during a transformation, we can design electromagnetic cloaks with arbitrary shapes if t...

A biventricular model, which coupled the electrical property and mechanical property of the heart, was constructed and the ventricular wall motion and deformation have been simulated based on this model. The biventricular mechanical model was constructed based on composite material theory and finite element method. The excitation propagation was simulated by electrical heart model, and the resu...

this study was a qualitative research which was done by a case study approach. the samples were chosen from rural development experts of hamedan province during a snowball sampling process. the data were collected by the semistructured interviews. the data collection was done by faceto- face interviews, after the interview questions guide was determined. the theoretical saturation was attained ...

objective: this article presents an application of cluster analysis for social sciences researches especially those studies that have an interview as part of their data collection. this application is more suitable for sequential mixed method researchers who use quantitative data to frame subsequent qualitative subsamples for conducting interviews.  methods: in more detail, the algorithm (i.e.,...

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cancer remains a major cause of death worldwide. huge research and identification of several markers have resulted in better understanding of its mechanism. researches focusing on cancer stem cells and their role in metastasis will help the scientific community to propose the therapeutic approaches for treatment of this monstrous disease. interest of governmental agencies and inter-communicatio...

the classical etiology of erectile dysfunction (ed) comprises aging and vascular, neurogenic, psychological and hormonal components. recent studies have shown that ed can be the forerunner of serious cardiovascular disturbances. it has also been reported that peripheral neuropathy and microvascular injuries caused by pathophysiological changes in patients with diabetes and obesity lead to ed in...