**8. References**


The modified stent can expand the vascular wall in a more flat manner. Therefore, modification of the designed stent by using the proposed method can relax the force concentration at both ends of the stent by attaining flat expansion of the vascular wall.

This chapter described evaluating mechanical properties of a stent and designing/selecting a stent suitable for diverse clinical manifestation by efficiently using the evaluated results. By rounding up the results described above, it can be confirmed that two objectives, which are establishments of designing/selecting a stent suitable for diverse clinical manifestation, were achieved. The stent, which is designed by using the method described in this chapter, has nonuniform shapes along its axial direction. This shape is radically new compared to the conventional stent shape that is uniform along its axial direction. Thus, the stent shape

Babapulle, M. N.; Joseph, L., Bélisle, P., Brophy, J. M., & Eisenberg, M. J. (2004). A

Carnelli, D.; Pennati, G., Villa, T., Baglioni, L., Reimers, B., & Migliavacca, F. (2010).

Clark, D. J.; Lessio, S., O'Donoghue, M., Tsalamandris, C., Schainfeld, R., & Rosenfield, K.

Colombo, A.; Stanlovic, G., & Moses, J. W. (2002). Selection of coronary stents. *Journal of the* 

Duda, S. H.; Wiskirchen, J. Tepe, G., Bitzer, M., Kaulich, T. W., Stoeckel, D., & Claussen, C.

Gow, B. S. & Hadfield C. D. (1979). The elasticity of canine and human coronary arteries

Grewe, P. H.; Deneke, T., Machraoui, A., Barmeyer, J., & Müller, K.-M. (2000). Acute and

Hayashi, K.; Handa, H., Nagasawa, S., Okumura, A., & Moritake, K. (1980). Stiffness and

Hayashi, K. (2005). *Biomechanics*, Corona Publishing, Tokyo, Japan. (in Japanese)

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hierarchical Bayesian meta-analysis of randomised clinical trials of drug-eluting stents. *Lancet*, Vol. 364, No. 9434, (August 2004) 583-591, ISSN 0140-6736 (print

Mechanical properties of open-cell, self-expandable shape memory alloy carotid stents. *Artificial Organs*, Vol. 35, No. 1, (January 2011) 74-80, ISSN 0160-564X (print

(2006). Mechanisms and predictors of carotid artery stent restenosis--A serial intravascular ultrasound study. *Journal of the American College of Cardiology*, Vol. 47,

*American College of Cardiology*, Vol. 40, No. 6, (September 2002) 1021-1033, ISSN

D. (2000). Physical properties of endovascular stents: an experimental comparison. *Journal of Vascular and Interventional Radiology*, Vol. 11, No. 5, (May 2000) 645-654,

with reference to postmortem changes. *Circulation Research*, Vol. 45, No. 5,

chronic tissue response to coronary stent implantation: pathologic findings in human specimen. *Journal of the American College of Cardiology*, Vol. 35, No. 1,

elastic behavior of human intracranial and extracranial arteries. *Journal of* 

designed by using the method is considered to be a new-generation type.

No. 12, (June 2006) 2390-2396, ISSN 0735-1097.

(November 1979) 588-594, ISSN 0009-7330.

(January 2000) 157-163, ISSN 0735-1097.

**7. Conclusion** 

**8. References** 

version).

version).

0735-1097.

ISSN 1051-0443.


**0**

**9**

*Serbia*

**Spin and Spin Recovery**

and Aleksandar Bengin<sup>3</sup> <sup>1</sup>*University Singidunum, Belgrade*

Dragan Cvetkovi´c1, Duško Radakovi´c2, Caslav Mitrovi´ ˇ c3

<sup>2</sup>*College of Professional Studies "Belgrade Politehnica", Belgrade*

Spin is a very complex movement of an aircraft. It is, in fact, a curvilinear unsteady flight regime, where the rotation of the aircraft is followed by simultaneous rotation of linear movements in the direction of all three axes, i.e. it is a movement with six degrees of freedom. As a result, there are no fully developed and accurate analytical methods for this type of

Unwanted complex movements of aircraft are shown in Fig.1. In the study of these regimes, one should pay attention to the conditions that lead to their occurrence. Attention should be made to the behavior of aircraft and to determination of the most optimal way of recovering the aircraft from these regimes. Depending on the position of the pilot during a spin, the

spin can be divided into upright spin and inverted spin. During a upright spin, the pilot is in

The upright spin is carried out at positive supercritical attack angles, and the inverted spin at negative supercritical attack angles. According to the slope angle of the aircraft longitudinal axis against the horizon, spin can be steep, oblique and flat spin (Fig.2). During a steep spin,

position head up, whilst in an inverted spin his position is head down.

**1. Introduction**

**2. Types of spin**

Fig. 1. Unwanted rotations of aircraft

problem.

<sup>3</sup>*Faculty of Mechanical Engineering, Belgrade University*

