نتایج جستجو برای: third geometric

تعداد نتایج: 333498  

2016
Julian von Lautz Lars Pastewka Peter Gumbsch Michael Moseler

The collision of two cylindrical hydrogen-free diamond-like carbon (DLC) asperities with approximately 60 % sp3 hybridization has been studied using classical molecular dynamics. The severity of the collision can be controlled by the impact parameter b that measures the width of the projected overlap of the two cylinders. For a cylinder radius of R = 23 nm, three collisions with b = 0.5 nm, b =...

2009
R. Komendarczyk

We introduce an alternative approach to the third order helicity of a volume preserving vector field X. The proposed approach exploits correspondence between the Milnor ¯ µ 123-invariant for 3-component links and the homotopy invariants of maps to configuration spaces, and we provide a simple geometric proof of this fact in the case of borromean links. Based on these connections we develop a fo...

Journal: :Journal of Archaeological Science 2022

Sheep and goat are often herded together show morphological similarities in their skeleton. Being able to identify archaeological remains of these two taxa species level is particularly important for understanding characterising past herding practices. Discrete criteria now available a large number bones teeth, quantitative approaches have been developed post-cranial elements but not mandible i...

Journal: :Adv. Comput. Math. 1998
Even Mehlum Christian Tarrou

Two novel smoothness measures for surfaces are presented in this paper. The second and third order smoothness are defined as the squared normal curvature and the squared variation in normal curvature integrated over all directions in the tangent plane. Both quantities are truly geometric in the sense that they are invariant with respect to the actual parametrization of the surface. All the same...

2008
F M Mahomed

Using geometric methods for linearizing systems of second order cubically semi-linear ordinary differential equations and third order quintically semi-linear ordinary differential equations, we extend to the fourth order by differentiating the third order equation. This yields criteria for linearizability of a class of fourth order semi-linear ordinary differential equations, which have not bee...

2005
R DAVID KUMAR

In this paper we define nth order Hessian structures on manifolds and study them. In particular, when n = 3, we make a detailed study and establish a one-to-one correspondence between third-order Hessian structures and a certain class of connections on the second-order tangent bundle of a manifold. Further, we show that a connection on the tangent bundle of a manifold induces a connection on th...

Geometric programming is efficient tool for solving a variety of nonlinear optimizationproblems. Geometric programming is generalized for solving engineering design. However,Now Geometric programming is powerful tool for optimization problems where decisionvariables have exponential form.The geometric programming method has been applied with known parameters. However,the observed values of the ...

Bavandi, S., Cao, B. Y., Khorsandi, A.,

Nowadays Geometric Programming (GP) problem is a very popular problem in many fields. Each type of Fuzzy Geometric Programming (FGP) problem has its own solution. Sometimes we need to use the ranking function to change some part of GP to the linear one. In this paper, first, we propose a method to solve multi-objective geometric programming problem with trapezoidal fuzzy variables; then we use ...

Journal: :جنگل و فرآورده های چوب 0
مجید لقمانپور ؛ دانشجوی دکتری جنگل داری، دانشگاه ملی اراضی ارمنستان، کارشناس سازمان جنگل ها، مراتع و آبخیزداری، تهران، ایران محسن الهی دانش آموختة کارشناسی ارشد جنگل داری، دانشکدة منابع طبیعی، تربیت مدرس، نور، ایران علی یخکشی استاد دانشکدة منابع طبیعی، دانشگاه علوم کشاورزی و منابع طبیعی ساری، ساری، ایران ژهائیر واردانیان استاد دانشگاه ملی اراضی، ایروان، ارمنستان

in order to investigate the effects of  management models on the diversity of wooden species, forests of third series of shiler, the first division mehrbanrud watershed and third and fourth series of eight division of behshahr – neka townships were studied with participatory and governmental management respectively. the diversity of the wooden species have been evaluated by diversity parametric...

2014
A. P. Sugunan Haimanti Bhattacharya Debdutta Bhattacharya A. Mandal S. R. Ghosal R. C. Rao A. K. Mandal

BACKGROUND & OBJECTIVES A total of 237 Nicobarese subjects who had received hepatitis B vaccination as part of mass vaccination project during 2000-2001 were screened for anti-HBsAg titres by quantitative ELISA five years after vaccination. METHODS Anti-HBsAg antibody was estimated using quantitative ELISA. Proportion of the subjects with protective levels of antibody and geometric mean antib...

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