Statistical Evaluation of Life Expectancy of Vacuum Tubes Designed for Long-Life Operation

1951 ◽  
Vol 39 (2) ◽  
pp. 137-141 ◽  
Author(s):  
E.M. McElwee
Author(s):  
David E. Hayes-Bautista

The 2016 Republican presidential campaign has been based on an overtly anti–Mexican immigrant nativist message, another round in the universalistic versus nativist conflict over the definition of American. Nationally, Latinos exhibit the strong work ethic, avoidance of welfare, positive health outcomes, and long life expectancy of Latinos in California. In the post-millennial generation in the top eleven Latino market areas, Latino presence ranges from being a large majority to being the largest plurality. Latino post-millennials will be instrumental in creating the twenty-first-century definition of American.


2013 ◽  
Vol 703 ◽  
pp. 249-254
Author(s):  
I Chiang Yang ◽  
Po Szu Lai ◽  
Yu Lin Juan ◽  
Tsair Rong Chen ◽  
Ching Mu Chen

In this research, the verification on the torque limiter is completed by using the mechanism of a torque limiter integrated with the infrared optointerrupter feedback detection. Through a shuttle and an infrared optointerrupter, it is meant to determine whether the rotation mechanism is affected by the mechanism of a torque limiter. With this, it is available to determine if any jamming happens. Through the testing verification of physical mechanisms, the feasibility for the torque limiter proposed by this research is conducted. It can avoid current shorting when dead jamming happens. Also, the detection circuits relevant to the detection of motor current feedback can be saved to reduce systematical circuit maintenance and manufacture torque limiters with long life expectancy, higher stability and low cost.


2021 ◽  
Author(s):  
Julissa Rojas-Sandoval ◽  
Pedro Acevedo-Rodríguez

Abstract Bambusa vulgaris is the most commonly encountered bamboo in cultivation in SE Asia but is rarely found in natural forest (although possibly natural, or escaped, naturalized populations exist). It is grown pantropically, and is the only Asian species that is common in the New World. Ease of propagation is the main reason for its success, culms and branches rooting very readily indeed. Infrequency of flowering, failure to produce seed and divert resources away from culm production, and recovery of clumps after flowering are other assets, and may be a result of repeated selection and cloning (Stapleton, 1990). Although not very straight, not easy to split, and inflexible, the culms are thick-walled and initially strong although relatively susceptible to powder-post beetle attack. They find many uses, although structural use is not recommended without preservation to protect against beetles. The ease of propagation, long life expectancy, and high yield make this species better suited to production of pulp and biomass for energy. Susceptibility to bamboo blight is of concern, especially on sites with impeded drainage. Repeated vegetative propagation has resulted in reduced genetic variability. Ornamental clones with all yellow, or yellow striped culms, or shortened, swollen culm internodes ('Wamin') are widely cultivated.


2017 ◽  
Vol 45 (4) ◽  
Author(s):  
Tiago Ferraz ◽  
Alexandra Matias

AbstractThe relation between fertility and longevity has always been a subject of study and controversy. Indeed, life expectancy extension is found to be tied to late births. This conclusion can be drawn from social-observational studies like the Long Life Family Study in New England and the New England Centenarian Study on which was found that women whose last birth was after 40 years of age are more likely to live longer. Recently, a group in Israel published a review on animal and human studies that shed some understanding on the cellular mechanisms behind the association between pregnancy and tissue regeneration and repair. These studies shed some understanding to draw biological plausibility on the association between late pregnancy and life expectancy.


2009 ◽  
Vol 417-418 ◽  
pp. 37-40 ◽  
Author(s):  
Peter W.R. Beaumont

Predicting precisely where a crack will develop in a material under stress and exactly when in time catastrophic fracture of the component will occur is one the oldest unsolved mysteries in the design and building of large-scale engineering structures. Fitness considerations for long-life implementation of aerospace composites include understanding phenomena such as fatigue, creep and stress corrosion cracking that affect reliability, life expectancy, and durability of structure. Structural integrity analysis treats the design, the materials used, and figures out how best components and parts can be joined; furthermore, SI takes into account service duty.


2017 ◽  
Vol 110 (1) ◽  
pp. 14-25 ◽  
Author(s):  
Alessandro Piccardo ◽  
Tommaso Regesta ◽  
Alexandre Le Guyader ◽  
Nicola Di Lorenzo ◽  
François Bertin ◽  
...  

Author(s):  
Ronald F. Inglehart

The degree to which people experience threats to their survival shapes their basic values. Throughout history, most people lived just above the starvation level, but in the years after World War II, unprecedented prosperity and social welfare safety nets launched an intergenerational shift from survival to self-expression values. When the first postwar birth cohort reached adulthood in the 1960s, student protests erupted, inaugurating pervasive cultural changes. Historically, a coherent set of pro-fertility norms evolved that limits women to producing as many children as possible and that stigmatizes any other form of sexual behavior not linked with reproduction. Because pro-fertility norms require people to repress strong drives, there is a built-in tension between them and their polar opposite, individual-choice norms. Throughout history, societies that lacked pro-fertility norms tended to die out, but in recent decades, a growing number of societies have attained high existential security, long life expectancy, and low infant mortality, opening the way for a shift from pro-fertility norms to individual-choice norms.


2016 ◽  
Vol 824 ◽  
pp. 421-428
Author(s):  
Roland Leuck

An investor has the difficult decision to decide the insulation thickness, before he starts a refurbishment measurement. Due to a long life expectancy of the construction components, this decision should take into account not the immediately effective investment costs, but also the longer lasting running cost. Therefore we are suggesting and discussing some parameters to develop a mathematical approach to find the economical best insulation thickness. We will discuss statical and dynamical economical methods and in the end we will also look which influence have some different thermal conductivities.


1990 ◽  
Vol 45 (5) ◽  
pp. S206-S211 ◽  
Author(s):  
J. D. Curb ◽  
D. M. Reed ◽  
F. D. Miller ◽  
K. Yano

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