The Law of Requisite Variety is a mathematical theorem relating the number of control states of a system to the number of variations in control that is necessary for effective response. The Law of Requisite Variety does not consider the components of a system and how they must act together to respond effectively. Here we consider the additional requirement of scale of response and the effect of...

Anual, inicialmente, a revista passou a ser semestral a partir do volume 20 (2006), de forma que, a cada ano, se publicam dois números. Foi modificado o formato da Revista aumentando o seu tamanho, o que permitiu melhorar a qualidade das imagens, tão importante nas publicações dedicadas à arqueologia e ao patrimônio arqueológico, utilizando-se também a policromia. Essas melhorias técnicas deram...

Anual, inicialmente, a revista passou a ser semestral a partir do volume 20 (2006), de forma que, a cada ano, se publicam dois números. Foi modificado o formato da Revista aumentando o seu tamanho, o que permitiu melhorar a qualidade das imagens, tão importante nas publicações dedicadas à arqueologia e ao patrimônio arqueológico, utilizando-se também a policromia. Essas melhorias técnicas deram...

Clinical Handover remains one of the most perilous procedures in medicine (1). Weekend handover has emerged as a key area of concern with high variability in handover processes across hospitals (1,2,4, 5-10). Studying weekend handover processes within medicine at an acute teaching hospital revealed huge variability in documented content and structure. A total of 12 different pro formas were in ...

We describe a generating set for the variety of reflexive graphs that admit a compatible k-ary near-unanimity operation; we further delin-eate a very simple subset that generates the variety of j-absolute retracts; in particular we show that the class of reflexive graphs with a 4-NU operation coincides with the class of 3-absolute retracts. Our results generalise and encompass several results o...

Generalized Cox’s construction associates with an algebraic variety a remarkable invariant – its total coordinate ring, or Cox ring. In this note we give a new proof of factoriality of the Cox ring when the divisor class group of the variety is finitely generated and free. The proof is based on a notion of graded factoriality. We show that if the divisor class group has torsion, then the Cox ri...

background: acinetobacter baumannii is an important opportunistic pathogen which causes complications in hospitalized patients, especially those in icu. the aim of this study was to determine the frequency of class 1 and 2 integrons in multi-drug resistance a. baumannii and to investigate the association between the presence of integrons and antibiotic resistance patterns. methods: a total of 4...

Among the class of finite integral commutative residuated chains (ICRCs), we identify those algebras which can be obtained as a nuclear retraction of a conuclear contraction of a totally ordered Abelian l-group. We call the ICRCs satisfying this condition regular. Then we discuss the structure of finite regular ICRCs. Finally, we prove that the class of regular members generate a strictly small...

Most attempts to influence intrinsic motivation have focused on contextual support for basic need satisfaction, including the provision of autonomy support, structure, and interpersonal involvement (e.g., Edmunds et al. in Eur J Soc Psychol 38:375–388, 2008). This study explored the extent to which another factor, expectations for task variety, influenced interest, enjoyment, and locus of causa...