نتایج جستجو برای: pi index
تعداد نتایج: 436970 فیلتر نتایج به سال:
The Sadhana index (Sd) is a newly introduced cyclic index. Efficient formulae for calculating the Sd (Sadhana) index of linear phenylenes are given and a simple relation is established between the Sd index of phenylenes and of the corresponding hexagonal sequences.
در این مطالعه، 40 نفر از مراجعه کنندگان به بخش پریودونتولوژی دانشکده دندانپزشکی مشهد که مبتلا به generalized chronic periodontitis بودند، انتخاب شدند. بیماران فوق به صورت تصادفی به دو گروه 20 نفری مورد و شاهد تقسیم شده و برای هر گروه بعد از انجام جرم گیری و تسطیح سطح ریشه، شاخص های plaque index (pi)، gingival index (gi)، شاخص bleeding on probing (bop) و عمق پاکت (pd) در چهار ناحیه شامل مزیوباکا...
The vertex Padmakar-Ivan (PIv) index of a graph G was introduced as the sum over all edges e = uv of G of the number of vertices which are not equidistant to the vertices u and v. In this paper we provide an analogue to the results of T. Mansour and M. Schork [The PI index of bridge and chain graphs, MATCH Commun. Math. Comput. Chem. 61 (2009) 723-734]. Two efficient formulas for calculating th...
in this paper some upper and lower bounds for the greatest eigenvalues of the pi and vertex pimatrices of a graph g are obtained. those graphs for which these bounds are best possible arecharacterized.
Introduction: Adequate levels of progesterone and efficient uteroplacental circulatory system are considered as two important factors in maintaining normal pregnancy. Conspicuously, increased vascular resistance in the uterine artery can lead to severe complications including threatened abortion by an impairment to the embryo’s blood supply. This study was conducted to determine whether vaginal...
Background: Atherosclerotic vascular disease is a major cause of morbidity and mortality in patients with end-stage renal diseases on maintenance hemodialysis. Early atherosclerotic changes of the arterial wall can be evaluated by measuring intima-media thickness (IMT), and looking for the presence and structure of plaques and parameters of vascular resistance. In this study we investigated the...
The mathematical properties of nano molecules are an interesting branch of nanoscience for researches nowadays. The periodic open single wall tubulene is one of the nano molecules which is built up from two caps and a distancing nanotube/neck. We discuss how to automatically construct the graph of this molecule and plot the graph by spring layout algorithm in graphviz and netwrokx packages. The...
The aim of present investigation was to study the virulence of coccidiosis in Kadaknath birds, experimentally infected with E. tenella by OPG count, oocyst index and caecal lesions scoring. Sixty one-day old unsexed Kadaknath birds were randomly divided into a control, T1 and T2 groups comprising twenty chicks under each group. At d 21 of age, birds of T1 and T2 groups were individually inocula...
objective: an association between poor oral health and chronic lung disease has recently been reported. the purpose of this study was to explore this potential association between asthma and periodontal disease. materials and methods: this is a descriptive case controlled study. the samples were selected from patients referred to respiratory disease clinic in a hospital in tehran, iran. the stu...
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