Using results on Hadamard difference sets, we construct regular graphical Hadamard matrices of negative type of order 4m4 for every positive integerm. Ifm > 1, such a Hadamard matrix is equivalent to a strongly regular graph with parameters (4m4, 2m4 + m2,m4 + m2,m4 + m2). Strongly regular graphs with these parameters have been called max energy graphs, because they have maximal energy (as defi...

Susan H. Lin, ScD, OTR/L, is Director of Research, American Occupational Therapy Association, 4720 Montgomery Lane, Suite 200, Bethesda, MD 20814-3449; [email protected] Many occupational therapy practitioners enter the profession to help improve people’s lives, but how do we know that our treatments work? The answer lies not with techniques and modalities; instead, our treatments work because of t...

Using results on Hadamard difference sets, we construct regular graphical Hadamard matrices of negative type of order 4m for every positive integer m. If m > 1, such a Hadamard matrix is equivalent to a strongly regular graph with parameters (4m, 2m +m, m +m, m +m). Strongly regular graphs with these parameters have been called max energy graphs, because they have maximal energy (as defined by ...

the mathematical properties of nano molecules are an interesting branch of nanoscience forresearches nowadays. the periodic open single wall tubulene is one of the nano moleculeswhich is built up from two caps and a distancing nanotube/neck. we discuss how toautomatically construct the graph of this molecule and plot the graph by spring layoutalgorithm in graphviz and netwrokx packages. the sim...

There is evidence that significant changes may take place in the activities ofenzymes present in secreting glands under the influence of regulatory hormones. Gutman & Gutman (1938) reported increases in the acid phosphatase activity of prostate during the development of the epithelia induced by testosterone. According to Fuenzalida (1949), prolonged oestrogen treatment causes an increase in alk...