86,663 research outputs found
Lenz-Barlotti Classification and related open problems: an update
No full texthttp://www.mat.uniroma1.it/~combinat/quaderni
Lenz-Barlotti Classification is the most ambitious classification of projective planes. The planes are classified according to the configuration F formed by the point-line pairs (p,L) for which the plane is (p,L)-transitive. The last survey on existence problems of planes in the various Lenz-Barlotti classes dates back to 1973; in this paper, we discuss the known results and present the open problems, sketching the techniques that are being used, ot that might be used, to attack these problems
Characterization of some 4-gonal configurations of Ahrens–Szekeres type
No full textMotivated by the Ahrens–Szekeres Quadrangles, we shall present a variation of the 4-gonal family method of construction introduced by Kantor in 1980. The relation between generalized quadrangles of order (s, s) and of order (s − 1, s + 1) has been known for a long time. A geometrical description of this interrelation was given by Payne in 1971 and rests on the notion of regular points or of regular lines. In this paper we wish to develop these connections algebraically in the hope of getting more insight into them from the group-theoretical point of view. In this way we are able to characterize two classes of known 4-gonal configurations
On disjoint (3t,3,1) difference families
No full textWe give a new and easier proof of the existence of a disjoint (3t, 3, 1) cyclic difference family for every t >3, ?rst proved by Dinitz and Shalaby (2002). Our purely theoretical construction is still elementary but simpler and does not need to be checked by computer
Coping styles and psychosocial-related variables an HIV-infected patients
No full textThe study examined the relationship between coping and psychosocial variables (psychological stress symptoms, locus of control, emotional repression, and social support) among 108 human immunodeficiency virus (HIV)-infected patients. The authors administered several tests, including one that measures fighting spirit and degree of hopelessness, to assess each patient’s individual coping style. The patients who were adjusting
well to their HIV-positive status tended to have a higher level of fighting spirit and lower degree of hopelessness than those patients who were not adjusting well to their HIV-positive status. A coping style based on incapacity to face and confront HIV infection
was associated with symptoms of psychological stress, repression of anger, external locus of control, and low social support in the latter group. These patients showed symptoms indicating maladjustment to HIV infection (43% of the sample) and differed
from the “noncases” (the well-adjusted patients) in that the former group reported inadequate coping responses (lower fighting spirit and higher hopelessness, fatalistic attitude,
and anxious preoccupation) and poorer social support, and had a greater tendency to repress anger and express sadness. The data support the hypothesis that coping with HIV infection is a complex phenomenon involving multiple and interacting variables. Interventions aimed at improving the coping style for many HIV patients are needed
Aderire o non aderire? E' davvero solo una questione di stile? Stili cognitivi di elaborazione delle informazioni e adesione di trattamenti in un gruppo di pazienti oncologici
No full textRelazione tra diagnosi di tumore e smoking cessation: studio dei comportamenti e degli atteggiamenti associati al consumo di tabacco in pazienti oncologici
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Reference intervals for transthoracic echocardiography in the american staffordshire terrier
No full textThis study reports the echocardiographic reference intervals in the American Staffordshire Terrier (AST). The echocardiographic variables obtained in 57 healthy adult AST were compared with published data from the general canine population and other breeds. In the AST, the left ventricular volumes were lower than values reported in Boxers and Dobermans (P<0.0001), but higher than in small breeds (P<0.0001). The left ventricular ejection fraction was higher than Boxers and Dobermans (P<0.0001), but lower than small breed dogs (P= 0.027). The aortic peak velocity values were similar to Boxers (P=0.55) but higher than the general canine population (P<0.0001). The reference intervals presented in this study are clinically useful for an accurate echocardiographic interpretation and screening in the AST
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