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Open access

WD Heller and G Scherer

Open access

Eugeniusz Suwiński

Abstract

All societies of our civilization are growing old, people live longer and longer and there are more and more old people. It results in the fact that problems of old people, either individual or of social aspects, are getting one of the crucial tasks for the society nowadays. In fact, there are no grounds to envy or to feel compassion for old people. The old man is a fully normal man, only the old one. We are all growing old…whether we want it or not – and we can only wonder, how it will be, when we get old… Without any doubt, it is important to live as long as possible, but not less important is the quality of life, physical and mental condition, good mood and the most of all – the good health. The old age, may not be a flow of happiness, but it of course has its good prospects and can remain positive. The aim of that study is the attempt to show the status of a man in the process of ageing and all aspects connected with this process. The study should allow us not only to perceive the positive aspects of old age, but also to acquaint ourselves with the mechanism of growing old and show us how to reduce the instinctive fear of growing old and what to do to make this period of our lives bearable and stately. What does it mean to grow old? How does it feel like to be old? How have people tried to prevent the process of ageing in different cultures in the past centuries? How it is being done nowadays? What are the advantages of growing old? The attempt to find the answers for the above mentioned questions is the aim of that study. Its keynote is paradoxically quite optimistic and helps us to stay calm in the face of this inevitable fate we all are going to meet with.

Open access

Henryk Tomaszek, Ryszard Kaleta and Mariusz Zieja

Abstract

A model to monitor the risk of a failure/damage (undesirable event) to a means of transport has been outlined in the paper, with findings presented in [2] applied. Destructive processes such as the wear-and-tear, fatigue, and ageing, which arise in the course of the system’s (here: the means of transport) service are most fundamental factors that make health/maintenance status thereof deteriorate. A relationship that describes the probability of an undesirable event (failure) against the system’s service life has been formulated. The rate at which undesirable events may occur, i.e. the failure rate, has also been defined. What results from derived relationships is the statement that failure rates are functions of time the system remains in service. With the permissible risk level assumed, there is a chance to determine the permissible time of failsafe operation.

Open access

Anna Kulesa, Andrzej Kurek, Tadeusz Łagoda, Henryk Achtelik and Krzysztof Kluger

Abstract

The paper presents a comparison of the fatigue life curves based on test of 15Mo3 steel under cyclic, pendulum bending and tension-compression. These studies were analyzed in terms of a large and small number of cycles where strain amplitude is dependent on the fatigue life. It has been shown that commonly used Manson-Coffin-Basquin model cannot be used for tests under cyclic bending due to the impossibility of separating elastic and plastic strains. For this purpose, some well-known models of Langer and Kandil and one new model of authors, where strain amplitude is dependent on the number of cycles, were proposed. Comparing the results of bending with tension-compression it was shown that for smaller strain amplitudes the fatigue life for both test methods were similar, for higher strain amplitudes fatigue life for bending tests was greater than for tension-compression.

Open access

Nicolae Moro

Abstract

Romania’s membership of the select group of states belonging to the North Atlantic Treaty Organization brings, in addition to the expected security benefits and assurances and commitments and obligations that we have to assume. The participation of politicians, militaries and Romanian experts in the decision-making within the specialized committees of the NATO structures is an extremely important element for the assertion of Romania as a security guarantor in the area, a hypostasis that was only a vision a few years ago. This role of our country must be supported by strong and powerful military capabilities, capabilities that are hard to reach for many of the countries in Eastern Europe. The economically advantageous and technologically viable solution for a period of time is to acquire advanced military technical systems that are equipped with the great economic powers of NATO, systems used and verified by these armies, revitalized and upgraded, a second life goal.

Open access

Irina Băncescu

References [1] Aarset M.V., How to identify a bathtub hazard rate, IEEE Transactions on Reliability, 36, (1987). [2] Akgul F., Frangopol DM, Computational platform for predicting lifetime system reliability pro_tes for di_erent structure types in a network, Jour- nal of Computing in Civil Engineering, 18(2) (2004), 92-104. [3] Andrews D.F., Herzberg A.M., Data: a collection of problems from many fields for the student and research worker, Springer Science Business Me- dia (2012). [4] Arnold B

Open access

PI Adams

Abstract

I was very honoured when the Editors asked me to writesome account of my many years in the tobacco industrywith particular reference to my activities in the TechnicalCommittee ISO/ TC 126 “Tobacco and tobacco products”of the International Organization for Standardization(ISO).

Open access

Olgierd Hryniewicz

. (1996a). Estimation from truncated lifetime data with supplementary information on covariates and censoring times. Biometrika , 83(4), 747-761. Lawless J. F. (1982). Statistical Models and Methods for Lifetime Data. John Wiley and Sons, New York. Lawless J. F. (2003). Statistical Models and Methods for Lifetime Data. Second Edition. John Wiley and Sons, New York.

Open access

Olgierd Hryniewicz

.F. (1996). Estimation from truncated lifetime data with supplementary information on covariates and censoring times. Biometrika , v.83, no.4, p.747-761. Lawless J.F. (1982). Statistical Models and Methods for Lifetime Data. John Wiley and Sons, New York. Lawless J.F. (2003). Statistical Models and Methods for Lifetime Data. Second Edition. John Wiley and Sons, New York.

Open access

Maciej Tydda and Bożena Jasińska

References 1. Tao, S. J. (1972). Positronium annihilation in molecular substances. J. Chem. Phys ., 56, 5499–5510. DOI: 10.1063/1.1677067. 2. Eldrup, M., Lightbody, D., & Sherwood, J. N. (1981). The temperature dependence of positron lifetimes in solid pivalic acid. Chem. Phys ., 63 , 51–58. DOI: 10.1016/0301-0104(81)80307-2. 3. Jasińska, B., Kozioł, A. E., & Goworek, T. (1996). Ortho-positronium lifetimes in nonspherical voids. J. Radioanal. Nucl. Chem ., 210 (2), 617–623. DOI: 10.1007/BF02056403. 4. Jasińska, B., Kozioł, A. E