In a qualitative study of single people conducted in 2003 one particular finding stood out: a significant number of the interviewees (economically independent and without a partner) revealed their involvement in various other forms of regular or even long-term relationships. In an analysis of in-depth interviews conducted in 2003-2005 the following categories of alternative relationships were identified as typical for the social context of contemporary Czech society: 'relationships with married lovers', 'weekend marriages', 'long-distance relationships', 'one-night stands', 'open relationships', 'lover in case of need', and 'relationships to prove oneself'. The existence of relationships that are not longterm or reproduction-oriented is not a result of any deliberate strategy but is rather a consequence of the complex changes in mentality and behaviour that occurred in the 1990s. These shifts, for example, relating to professional commitment and career satisfaction, tend to be understood as the explicit result of labour-market pressures on individual actors, but research has shown that, even at the level of individual actors, alternative approaches to partner relationships and reproduction are much more the result of people adopting and internalising post-1989 cultural templates.
The singular cases of mechanisms have been defined as those positions of a mechanism where it loses its unambiguousness. Those positions are characterized with abrupt changes of kinematic magnitudes, which then manifest as complications during the mechanism control.
Groundwater flow in surroundings of water structures is frequently noted for singularities in velocity field. These are induced by high gradients of velocity and pressure in closeness of slots and edges in structures. The study does analysis of some hydrodynamic properties of the singularities and warns against its possible incorrect model simulation. and Prúdenie podzemnej vody v okolí hydrotechnických stavieb ako sú potrubia, tunely, nádrže a plavebné komory sa často vyznačuje zvláštnosťami (singularitami) v rýchlostných poliach. Tie sú vyvolávané vysokými gradientami rýchlosti a tlaku v okolí netesností objektov, alebo ich núteným obtekaním. Štúdia analyzuje hydrodynamické vlastnosti týchto singularít a upozorňuje na dôsledky ich prípadne nesprávnej interpretácie.
Na hustě osídleném ostrově Srí Lanka se zachovalo necelých 5 % primárních deštných lesů. Část z nich je chráněna v biosférické rezervaci Sinharaja na jihozápadě země. Vysoký stupeň endemismu je typický pro flóru i faunu rezervace. Různorodé rostlinné formace, které se plynule mění od nížin až po submontánní stupeň, představují refugium pro mnohé vzácné a ohrožené druhy živočichů - více než 50 % z nich je endemických. Protože o toto chráněné území projevuje zájem stále větší počet turistů, lze předpokládat, že nebude v budoucnu ohroženo exploatací a bude i nadále spravováno podle nejnovějších poznatků ekologů. I proto je pro návštěvníky zpřístupněna jen nepatrná část rezervace., Only 5 % of primary rainforests have been preserved on the densely populated island of Sri Lanka. Some rainforests are preserved within the biosphere reserve Sinharaja in the southwest of the country, with a high degree of flora and fauna endemism. Various plant formations, changing from lowlands up to the submontaneous level, provide a refuge for rare and endangered species of animals (more than 50 % endemic). Due to rising tourism, the area likely will not be much exploited and will be managed according to the latest ecological knowledge., and Jozef Májsky.
In arid and semiarid regions where water is the main limiting factor, water redistribution is regarded as an important hydrological process of great ecological value. By providing additional water to certain loci, moist pockets of great productivity are formed, characterized by high plant biomass and biological activity. These moist pockets are often a result of runon. Yet, although runoff may take place on semi-flat undulating surfaces, runoff measurements are thus far confined to slopes, where a sufficient gradient facilitates downslope water harvesting. On undulating surfaces of mounds and depressions, such as in interdunes, no quantification of the amount of water reaching depressions is feasible due to the fact that no reliable method for measuring the runoff amounts in semi-flat terrains is available. The current paper describes specific runoff plots, designed to measure runoff in depressions (sinks). These plots, termed sink plots (SPs), were operative in the Hallamish dunefield (Negev Desert, Israel). The paper presents measurements of runoff yield that were carried out between January 2013 and January 2014 on SPs and compared them to runoff obtained from crusted slope plots and fine-grained (playa) surfaces. The potential hydrological and ecological implications of water redistribution within semi-flat terrains for this and other arid ecosystems are discussed.