This paper examines the impact of the R&D tax credit between 1981-1991 using confidential IRS data from corporate tax returns. This paper makes two key advances on previous work. First, this paper implements a new instrumental variables (IV) strategy based on tax changes that directly addresses the simultaneity of R&D spending and marginal credit rates. Second, it makes use of new restricted-ac...

BACKGROUND Skin cancer is the most common neoplasm in Brazil, with increasing incidence in recent decades. Data on the incidence of squamous cell carcinoma are scarce in southern Santa Catarina. OBJECTIVE To establish epidemiological data on squamous cell carcinoma in Tubarão, State of Santa Catarina. METHODS A cross-sectional review was conducted on anatomical pathology reports, positive f...

the purpose of this research is to numerically investigate the interaction of pulsatile flow of blood with an axisymmetric artery in various percentages of stenosis. the carreau non-newtonian model and the generalized maxwell rheological model were used to model the blood fluid and the viscoelastic wall of arterial, respectively. the innovation of the present research is modeling of viscoelasti...

Introduction: The aim of the present study was to evaluate the effect of glass ceramic insert in the sandwich technique to reduce microleakage in class II composite resin restorations. Methods: Sixty sound human upper second premolars were selected and randomly divided into six groups (n=10). Class II box-only cavities were prepared in distal aspects of each tooth with gingival margin located a...

To study the effect of herb ginger powder on performance, carcass characteristics and blood parameters of broilers used from 192 broiler chicks (Ross ) in a completely randomized design with 4 treatments and 4 replicates ( each replicate of 12 chicks ). All treatments, including different levels of ginger powder ratios of 0, 0.5, 1, 1.5 percent respectively called T1, 2T, T3 and T4 that were ad...