We present an extension of the Delsarte linear programming method for spherical codes. For several dimensions it yields improved upper bounds including some new bounds on kissing numbers. Musin’s recent work on kissing numbers in dimensions three and four can be formulated in our framework.

With a few exceptions, the literature on face recognition and its neural basis derives from the presentation of single faces. However, in many ecologically typical situations, we see more than one face, in different communicative contexts. One of the principal ways in which we interact using our faces is kissing. Although there is no obvious taxonomy of kissing, we kiss in various interpersonal...

Chrysanthemum chlorotic mottle viroid (CChMVd) RNA (398-401 nucleotides) can form hammerhead ribozymes that play a functional role in its replication through a rolling-circle mechanism. In contrast to most other viroids, which adopt rod-like or quasi-rod-like secondary structures of minimal free energy, the computer-predicted conformations of CChMVd and Peach latent mosaic viroid (PLMVd) RNAs a...

Abstract. Ultrasonic waves, either bulk waves or guided are commonly used for non-destructive evaluation, example in structural health monitoring. Traditional sensors detecting ultrasonic include metallic strain gauges and piezoelectric ceramics. Recently piezoresistive nanocomposites have emerged as a promising sensor with high sensing range. In this paper, constriction-resistive based made fr...

T he regular tetrahedron is the simplest Platonic solid. Nevertheless, in studying its packing properties, several renowned scholars have made mistakes, and many questions about it remain unsolved. Currently no one knows the density of its densest packings, the density of its densest translative packings, or the exact value of its congruent kissing number. In this paper we recount historical de...

سابقه و هدف: کلیه ­ی اشخاص، اعم از حقیقی یا حقوقی مسئولیت حفاظت محیطزیست را برعهده دارند. اشخاص به این معنی است که فرد ملزم خساراتی دیگری وارد کرده جبران کند در حقوق امر قانونی یاد می‌شود. مقاله تحلیل چگونگی ارتباط مدنی محیط‌زیستی اجتماعی پرداخته شده محیط‌زیستی، یک ساختار سه‌گانۀ یکپارچه مورد بحث بررسی قرار گرفته است.مواد روش‌ها: تحقیق کیفی روش محتوا استفاده است؛ بدین شرح میان منابع داخلی بین‌ا...

For each proper power of 4, n, we describe a simple explicit construction of a finite collection of pairwise disjoint open unit balls in R in which each ball touches more than 2 √ n others. A packing of balls in the Euclidean space is a finite or infinite collection of pairwise disjoint open unit balls in Rn. It is called a lattice packing if the centers of the balls form a lattice in Rn. The m...