Fatigue analysis of hybrid wind turbine towers between cut in speed and out are demonstrated. Nominal stress method miner liner accumulated damage theory adopted. Through the results, comparative research on effect parameters aspect ratio, height ratio unequal legs for fatigue properties towers. The results show that optimal range is 1/6~1/4, 0.60~0.67. towers, should select right junction leew...

We prove that every tower of normal filters of height δ (δ supercompact) is precipitous assuming that each normal filter in the tower is the club filter restricted to a stationary set. We give an example to show that this assumption is necessary. We also prove that every normal filter can be generically extended to a well-founded V -ultrafilter (assuming large cardinals). In this paper we inves...

We propose a magnetic mechanism for the collimated explosion of massive stars relevant for long-duration gamma-ray bursts (GRBs), X-ray Flashes (XRFs) and asymmetric core collapse supernovae. In particular, we apply Lynden-Bell’s magnetic tower scenario to the interior of a massive rotating star after the core has collapsed to form a collapsar with a black hole accretion disk or a millisecond m...

is finite, and a uniform X-lattice if Γ\X is a finite graph, non-uniform otherwise ([BL], Ch. 3). Bass and Kulkarni have shown ([BK], (4.10)) that G = Aut(X) contains a uniform X-lattice if and only if X is the universal covering of a finite connected graph, or equivalently, that G is unimodular, and G\X is finite. In this case, we call X a uniform tree. Following ([BL], (3.5)) we call X rigid ...

We construct most symmetric Saddle towers in Heisenberg space i.e. periodic minimal surfaces that can be seen as the desingularization of vertical planes intersecting equiangularly. The key point is the construction of a suitable barrier to ensure the convergence of a family of bounded minimal disks. Such a barrier is actually a periodic deformation of a minimal plane with prescribed asymptotic...

The sensible heat budget of a large-scale area containing an idealized tropical cloud cluster is analyzed. The cluster is assumed to have spatial dimensions and precipitation rates typical of observed cloud clusters. In its early stages of development the idealized cluster consists of isolated deep precipitating convective cells, or "hot towers." A simple model using the assumed precipitation r...

We introduce functional norms for hyperbolic Young towers which allow us to directly study the transfer operator on the full tower. By eliminating the need for secondary expanding towers commonly employed in this context, this approach simplifies and expands the analysis of this class of Markov extensions and the underlying systems for which they are constructed. As an example, we prove large d...

1. The universal p-Frattini cover. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2. The p-Frattini module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3. Restriction to the normalizer of a p-Sylow. . . . . . . . . . . . . . . . . . . . . . . 8 4. Asymptotics of the p-Frattini modules Mn . . . . . . . . . . . . . . . . . . . . ....

In this paper we discuss open problems concerning L-invariants focusing on approximation by towers of finite coverings.