Este estudo verifica a relação entre book-tax differences (BTD) Abstract This study aimed to investigate the relationship between book-tax differences (BTD) and earnings management in firms listed on the BM&F Bovespa. The final sample consisted of 485 observations (firm-year) and the analysis included the period from 2005 to 2009. Methodologically, two approaches were employed in this study: (i) frequency distribution and (ii) discretionary accruals -Modified Jones Model. The findings indicate a directly proportional relationship between BTD and discretionary accruals. There was evidence that the firms manage their earnings in the same direction of the observed signal of BTD, and seek to present the amount of BTD in level and variation around the breakeven and thus avoid a relationship with low earnings quality. Additionally, evidence indicate that the size of firm and the adoption of the tax basis transition are inversely related to the level of discretionary accruals. keywords Book-tax differences, earnings management, discretionary accruals, earnings quality, equity market. Resumen Este estudio verifica la relación entre book-tax differences (BTD) y gestión de resultados en compañías listadas en la

This paper describes the construction and main components of a full-scale superconducting magnetic levitation vehicle. The prototype, comprising four 1.5-m-long wagons, will travel a short test line of 200 meters, connecting two buildings inside the campus of the Federal University of Rio de Janeiro. The efforts to implement this technology started thirteen years ago with a small-scale prototype in an attempt to prove the concept. The second step was the construction of a functional prototype that could levitate more than one Ton. The actual stage of this project is the construction of an operational prototype mentioned above, designed to transport up to 24 passengers. This work has been reported in several previous editions of the ASC conference. New details about the elevated test line, the permanent magnetic (Nd-Fe-B) guideways, the cryostats with YBCO high critical temperature superconductors, the energy conditioning, the linear induction motor and its regenerative braking, as well as the automatic supply system of liquid nitrogen will be presented in the proposed paper. Tests with this operational prototype demonstrate the technology feasibility.

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PurposeThe purpose of this paper is to identify and analyze the literature related to accounting and auditing services quality.Design/methodology/approachThe authors performed a systematic literature review that considered 22 papers on the topic. The authors also applied a bibliometric analysis in order to identify the main characteristics of these studies to discuss and provide research opportunities in this field.FindingsThe bibliometric results indicate that most papers were published in services and marketing journals. The accounting service quality theme has been rarely researched in accounting field. In addition, based on our review, it was possible to identify that most papers use quantitative methods, such as surveys. The papers' conclusions diverge from each other, demonstrating a still fragmented literature.Research limitations/implicationsTaken together, the paper shows how accounting services quality is relevant and emerging topic that demands future research about accounting professionals' skills, their activities and how their customers perceive quality in an environment of constant change.Originality/valueThe analyses indicate that there are six broad areas for future research on this topic: successes and failures of accounting services providers; the role of “client centricity”; digital accounting services; services quality and accounting education; services quality when considering different types of accounting and auditing services and development of a measurement scale and a theoretical model for accounting services quality. This paper contributes for the ongoing debate about how competition, technology and innovation are changing the landscape for accounting and auditing services providers.