Fallback in bipolar planetary nebulae?

The subclass of bipolar Planetary Nebulae (PNe) exhibits well-defined low-power outflows and some shows shock-related equatorial spiderweb structures and hourglass structures surrounding these outflows. These structures are distinctly different from the phenomena associated with spherical and elliptical PNe and suggest a non-standard way to simultaneously energise both kinds of structures. This paper presents evidence from the published literature on bipolar PN Hb 12 and other sources in support of an alternative scenario for energising these structures by means of accretion from material shells deposited during earlier post-AGB and pre-PNe evolutionary stages. In addition to energising the bipolar outflow, a sub-Eddington accretion scenario could hydrodynamically explain the spiderweb and outer hourglass structures as oblique shockwaves for guiding the accreting material into the equatorial region of the source. Estimates of the accretion rate resulting from fallback-related spherical accretion could indeed help to drive a low-power outflow and contribute to the total luminosity of these sources.

Anti-Crisis Stability of Break-Even Development Potential and its Resource Support in Agribusiness

The article considers the anti-crisis stability of the potential of break-even development and its resource support in agribusiness. The necessity of a synergetic approach to estimating the dynamic flow of resources capable of generating own sources of financing to activate the target parameters of crisis stability of break-even development potential and the development of an alternative scenario of self-financing of the production and financial cycle to stimulate economic growth of agribusiness is proved. The reproductive process of resource support of anti-crisis stability of the potential for safe development of agribusiness enterprises is substantiated. The model of estimation of target parameters of anti-crisis stability of potential of unprofitable development of agrarian business and a matrix of its point estimation at a choice of the alternative scenario of self-financing is presented. Scenarios of the flow of resource support of anti-crisis stability of the potential of unprofitable development of the agribusiness enterprise are developed. An indicator of the level of anti-crisis stability of the break-even development potential according to the determined target parameters of self-financing is offered. The dynamics of anti-crisis factor load on the stability of the potential of break-even development of agribusiness enterprises on average in one region of the Steppe zone of Ukraine by its territorial location is analyzed. Cluster analysis was used to assess the elements of the qualitative system-resource component of anti-crisis stability of the potential of break-even development with the separation of types of agribusiness enterprises in the regions of the Steppe zone of Ukraine with different structure of current assets. The forecast level of resource support according to the quantitative component of anti-crisis stability of the potential of break-even development on average in the regions of the Steppe zone of Ukraine and per one agribusiness enterprise of the region is determined. The forecast range of limits of target parameters of self-financing and their influence on the level of anti-crisis stability of potential of unprofitable development of agribusiness enterprises on the average on one region of the Steppe zone is presented

The Yugoslav imaginary of Marko Vidojkovic in the novel "E baš vam hvala"

Although it has not formally existed for over thirty years, Yugoslavia continues to be an attractive subject for literature. Against two dominant currents of prose orbiting the SFRY – the settlement and nostalgic one, Marko Vidojkovic’s novel E baš vam hvala stands out with its attempt to answer the question: what would Yugoslavia be like in 21st century if it had not fallen apart. In this article this alternative scenario is considered in the context of close literary genres: science fiction and alternative histories.

Jacques Lacan’s Theory of Rupture: the Perspective of the Real

The article analyses Jacques Lacan’s theory of rupture that encompasses the three planes – the imaginary, the Symbolic and the Real – that comprise his topology. It is named the theory of rupture because it allows grasping the unfinished Lacanian subject as it encounters Other in all of those planes. The main question is whether this lack could be considered as positive. The attention is paid to the phallic signifier; the hypothesis is that this signifier, by linking the symbolic and the Real, allows the creation of new meanings and the resistance towards the fundamental fantasy.The Lacanian ternary conception of topology helps us to analyse the field of politics. While grasping this field from the “ex-sisting” perspective of the Real, we can observe the two scenarios of the development of (political) subject. On the one hand, there is a possible link between the subject and fantasy, in which one tries to compensate for the lack of the Real by “comforting” itself in the plane of symbolic discourse. On the other hand, in the alternative scenario, the subject consciously admits its lack, rejects the fantasy and begins to create new names which “hole” the symbolic discourse itself as well as the insufficiency of the symbolic field. The Real is defended by the phallic signifier, which helps to maintain the subject’s negativity and militancy. By enclosing the Real into the Symbolic we create the new consistency as the subject seeks not to maintain a passive form and place inside the structure, but names the positive lack in the structure itself and thereby creates the new political content.

Evaluation of Dairy Wastewater Treatment Systems Using Carbon Footprint Analysis

Modernisation of municipal and industrial wastewater treatment plants (WWTPs) should be carried out, taking into account its impact on global warming, e.g., through carbon footprint (CF) analysis. An important industrial sector in Poland is the dairy industry. In dairy WWTPs, the aerobic sewage sludge stabilisation applied thus far is being replaced by the anaerobic process. This change is positive due to the possibility of energy production, but it is unclear how it affects greenhouse gases (GHG) emissions. The aim of the research was to perform CF analysis for two scenarios of dairy WWTP operation. The analysis was based on the real operating data of the current system (current scenario) and project of its modernisation (alternative scenario). The current scenario consists of mechanical and dissolved air flotation (DAF) treatment, biological treatment in sequence batch reactors (SBRs), aerobic sewage sludge stabilisation and its final farmland usage. The alternative scenario assumes replacing aerobic stabilisation with anaerobic stabilisation and a combined heat and power (CHP) system. The CF calculations were based on empirical models, taking into account different emission input parameters, expressed in CO2 equivalents (CO2e). The total CF of the current scenario was 22 kg CO2e PE−1 year−1, while the alternative was 45 kg CO2e PE−1 year−1. The largest share in the current scenario belongs to emissions from WWTPs and energy use, while in the alternative, there is the addition of emissions from biogas use.

Maastrichtian representatives of the dragonfly family Aeschnidiidae question the entomofaunal turnover of the early Late Cretaceous

Gaps in the fossil record are the major challenge for estimations of impacts of crises of biodiversity of the various clades. They can lead to important misinterpretations in the effects of the different events on the fauna and flora. It is especially the case for the end-Cretaceous, which is ‘near the midpoint of a 16-million-year gap in the insect fossil record’ (Schachat & Labandeira, 2021: 111). All the important Cretaceous insect Konzentrat Lagerstätten are before the Turonian. The analysis of Schachat et al. (2019) has reconstructed a massive loss of family-level diversity for the insects at the boundary Cretaceous-Cenozoic, a possible artefact due to this gap. An alternative scenario was that a turnover in the entomofauna occurred during the early Late Cretaceous in relation to the floristic changes of the Albian–Cenomanian (Nel et al., 2018). This turnover would have also affected the aquatic insects through important changes in the freshwater environments (Sinitshenkova & Zherikhin, 1996; Ivanov & Sukatsheva, 2002). The current knowledge on the odonatan fossil record suggests a pronounced turnover with the last records of several major clades during the Cenomanian-Turonian and first records of several modern ones during the same period (Nel et al., 2015). The widespread and very diverse Jurassic-Cretaceous family Aeschnidiidae is among the best examples of such extinctions supposed to have occurred after the Cenomanian, because of the absence of any fossil in younger strata.

ShelteringThe Underbelly Of Society: Architecture As A Means Of Achieving Dignity For Those Living In A City's Residual Spaces

The attachment of the homeless to the city's residual spaces is a result of a lack of choice, but in some instances, it is a preference. This thesis focuses on the latter in addressing the housing needs of those who prefer to live outdoors rather than in the institutionalized environment of emergency shelters, or even permanent housing. It explores the role of architecture in empowering independence, dignity, and security without socially engineering the homeless and changing their lifestyle. This exploration is informed by the works of architects, urban geographers, cultural critics, artists and psychologists, among them the members of the Situationist International, Bernard Tschumi, Donald MacDonald, Michael Benedikt, David Harvey, Neil Smith, and Abraham Maslow. It proposes an alternative scenario whereby those persons preferring to live outdoors may be safely, decently, and innovatively sheltered independently in some of the many residual spaces found on streets and in parks.

ShelteringThe Underbelly Of Society: Architecture As A Means Of Achieving Dignity For Those Living In A City's Residual Spaces

The attachment of the homeless to the city's residual spaces is a result of a lack of choice, but in some instances, it is a preference. This thesis focuses on the latter in addressing the housing needs of those who prefer to live outdoors rather than in the institutionalized environment of emergency shelters, or even permanent housing. It explores the role of architecture in empowering independence, dignity, and security without socially engineering the homeless and changing their lifestyle. This exploration is informed by the works of architects, urban geographers, cultural critics, artists and psychologists, among them the members of the Situationist International, Bernard Tschumi, Donald MacDonald, Michael Benedikt, David Harvey, Neil Smith, and Abraham Maslow. It proposes an alternative scenario whereby those persons preferring to live outdoors may be safely, decently, and innovatively sheltered independently in some of the many residual spaces found on streets and in parks.

Evaluating the contact hypothesis for Old French word order

This volume revisits the classic and oft-repeated claim that Old French shows a raft of ‘Germanic’ grammatical properties due to contact with Frankish in the early medieval period. These properties include Verb Second, scrambling, Stylistic Fronting, and the loss of the null subject property. Drawing on a mixture of historical, formal syntactic, and acquisitional arguments it is suggested that the hypothesis is extremely problematic and suffers from major empirical and theoretical flaws, alongside major challenges in terms of dating. An alternative scenario is outlined in which left-peripheral verb movement and XP-fronting, middlefield scrambling, Stylistic Fronting, and progressive restrictions on null arguments are natural progressions of the syntactic system attested in late Latin. Finally, it is proposed that the core morphosyntactic parallels between early Germanic and Romance can be captured by their common syntactic inheritance from Proto-Indo-European.

Environmental and economic sustainability in public contexts: the impact of hand-drying options on waste management, carbon emissions and operating costs

Due to the high density of users hosted everyday, public buildings are important producers of waste and emissions of greenhouse gases (GHGs). Public restrooms play an underrated role in waste generation and GHG emissions, especially if paper towels are used as the hand-drying method. The choice of the hand-drying method (i.e., paper towels vs. electrical hand dryers) also affects the economic balance of a public institution, involving costs for the purchase of hand-drying materials/apparatuses, energy and waste disposal. The present paper aims at evaluating the economic and environmental impact of the introduction of electrical hand dryers (alternative scenario) in place of paper towels (reference scenario) in a public building. The paper presents a solid methodology, based on a numerical experiment approach, to identify a decision criterion for establishing the economical convenience of adopting the alternative scenario in public restrooms. Key factors affecting the choice between the proposed alternatives are presented and discussed in a dedicated sensitivity analysis. From the environmental point of view, this study evaluates the impact of each scenario in terms of GHG emissions, related to multiple waste treatment options and different electric grid mixes. Based on the experimental assumptions, the method allowed concluding that the alternative scenario becomes economically convenient when the number of daily usages (N) is > 57 ± 4. The environmental convenience of the alternative scenario is visible even at N < 10. The method here described can be successfully used to support strategic decisions for cost optimization and environmental mitigation in institutional buildings.