Computability on uncountable sets has no standard formalization, unlike that on countable sets, which is given by Turing machines. Some of the approaches to define computability in these sets rely on order-theoretic structures to translate such notions from Turing machines to uncountable spaces. Since these machines are used as a baseline for computability in these approaches, countability restrictions on the ordered structures are fundamental. Here, we show several relations between the usual countability restrictions in order-theoretic theories of computability and some more common order-theoretic countability constraints, like order density properties and functional characterizations of the order structure in terms of multi-utilities. As a result, we show how computability can be introduced in some order structures via countability order density and multi-utility constraints.

I consider the role of exposure to large-scale strikes in shaping preferences about workplace action and labor unions, replicating and extending past work identifying the effect of large-scale teachers’ strikes. I study a large 2019 grocery store strike. Using an original survey fielded in affected states and an instrumental variables design, I find strike exposure increased support for the strikes, including actions taken supporting the striking workers. I do not find consistent evidence that strikes increased interest in online actions to support other workers or in workers taking most forms of labor actions at their own jobs. Firsthand contact with strikes had no effect on individuals’ broader perceptions of the labor movement or support for a union at their job. These results suggest important distinctions between strikes. Suggestive evidence indicates that the grocery strikes may have failed to inspire a greater sense of linked fate between affected members of the public and striking workers, as had occurred with teachers’ strikes. I conclude by laying out a research agenda for understanding the impact of mass strikes.

Although the Transatlantic Trade and Investment Partnership with the USA and the Comprehensive Economic and Trade Agreement with Canada have elicited considerable domestic contestation in Europe, several other agreements have been negotiated into public and media indifference. What explains this difference? In this article, I put forward a number of arguments on the structural causes of the politicization of European Union (EU) trade policy over the past 30 years and test them against a newly collected dataset covering 19 preferential trade agreements. The qualitative comparative analysis suggests that the politicization of EU trade negotiations is determined by the co-occurrence of several, well-defined conditions. More specifically, it tells us that: (1) the Lisbon Treaty's reform of EU trade policymaking is the main driver of politicization, (2) the level of public support for the EU is of particular relevance when it comes to ‘deep and comprehensive’ agreements that touch on sensitive domestic issues, and that (3) high adjustment costs expected from trade liberalization can lead to the politicization of trade negotiations.

We give a simple method to estimate the number of distinct copies of some classes of spanning subgraphs in hypergraphs with a high minimum degree. In particular, for each $k\geq 2$ and $1\leq \ell \leq k-1$, we show that every $k$-graph on $n$ vertices with minimum codegree at least

\begin{equation*} \left \{\begin {array}{l@{\quad}l} \left (\dfrac {1}{2}+o(1)\right )n & \text { if }(k-\ell )\mid k,\\[5pt] \left (\dfrac {1}{\lceil \frac {k}{k-\ell }\rceil (k-\ell )}+o(1)\right )n & \text { if }(k-\ell )\nmid k, \end {array} \right . \end{equation*}

$\exp\!(n\log n-\Theta (n))$

$\ell$

$(k-\ell )\mid n$

$(k-\ell )\mid k$

$(k-\ell )\nmid k$

$\ell \lt k/2$

This commentary aims to discuss the article “Ordo-responsibility in the Sharing Economy: A Social Contracts Perspective” from a sympathetic viewpoint toward its implementation of a constitutional contractarian approach to business ethics and due consideration of digital platforms as institutions resulting from a social contract. Nevertheless, the commentary also wants to criticize the article’s interpretation of constitutional contractarian theory and institutional reconstruction of the phenomenon, and thus even the governance structure it is proposed for sharing platforms. The commentary presents another understanding of constitutional contractarianism, referring to both the ex ante agreement and the ex post compliance problem. Moreover, it reframes the history of the evolutionary process of institutions’ selection within the domain of the sharing economy consistently with the idea that the Internet should be framed as a common pool resource. In this way, the commentary suggests an alternative governance structure for sharing platforms, that is, platform cooperatives.

A systematic design approach is presented for the design of broadband high-efficiency power amplifiers (PAs) by combining an improved ring-resonant filter matching network with a series of continuous modes. The improved ring-resonant matching network presented can effectively enhance out-of-band attenuation and sharp roll-off characteristics by adding a compensation structure with parallel stub. To verify the proposed design theory, a 10-W GaN HEMT device is designed and fabricated. The test results indicate that from the operating frequency band of 0.55−3.3 GHz with a relative bandwidth of 142.9%, a saturated output power of 38.5−42 dBm, drain efficiency of 58.2−70.3%, and a gain of 8.5–12 dB can be achieved under 3 dB gain compression, indicating the rationality of the design theory.

The aim of this study is to assess the effects of substituting soybean meal with extruded urea in the diet of crossbred Texel x no defined racial pattern lambs under continuous grazing on Brachiaria ssp., focusing on both their productive and nutritional performance. 60 Texel crossbred lambs (12 animals for each treatment) were used, with an average initial weight of 20.7 ± 0.87 kg and an average age of 2.5 ± 0.70 months, fed treatments with increasing levels of UE (Urea extruded Amireia® 200S): 0; 6; 12; 18 and 24 grams of EU 100/kg of body weight, with trial period was 5 months, using the multivariate technique. The data were subjected to principal component and canonical discriminant analysis to check possible differences between the evaluated treatments and identify the variables that best discriminate and use these variables to create a discriminant function that represents the differences between treatments. Of the 12 variables initially used, we observed that 9 were used by the main components, but 6 were those that presented the greatest discriminatory power for the study. Main component 1 was characterized by biometric measurements and showed the greatest power of variation in the study (60%), followed by main component 2, represented by slaughter weight and empty body weight (13%). These correlations indicate that biometric measurements can serve as reliable indirect indicators for estimating carcass traits in sheep, offering a practical alternative to visual assessments.

This study examines how Slovenian communist leadership’s views on the Yugoslav state framework evolved in the late 1980s. To this end, the actions of Slovenian leaders during the procedure of amending the Yugoslav constitution and the discussions in the Slovenian party headquarters on the subject of relations in the federation are analyzed in detail. On the background of growing nationalism in public opinion in Slovenia, the communist leaders of the republic put themselves in an increasingly antagonistic position vis-à-vis the federal center. During 1987, they rejected several proposals for changes to the Yugoslav constitution, which they had initially agreed to based on an incorrect assessment of Slovenian public opinion. Then, in the summer of 1988, in the atmosphere of the Slovenian Spring, local leaders began to favor the weakening of the ties between the Yugoslav republics and redefinition of Yugoslavia as a confederation. Simultaneously, Slovenian politicians were also increasingly questioning some primary assumptions about the existence of the common state and radicalized their political methods in terms of promoting Slovenian interests at the federal level.

Natural resources such as soil and water are essential to agriculture, especially in arid and semi-arid rain-fed areas, yet the impacts of managing these crucial natural resources on farm technical efficiency are little known. Using data from 400 households with 1031 plots, we examined the impacts of soil and water conservation measures (SWCMs) on the technical efficiency of farmers in the semi-arid Bundelkhand (central India). We estimated stochastic production frontiers, considering potential self-selection bias stemming from both observable and unobservable factors in the adoption of SWCMs at the farm level. The farm technical efficiency for adopters of SWCMs ranged from 0.68 to 0.72, and that for non-adopters ranged from 0.52 to 0.65, depending on how biases were controlled for. As the average efficiency is consistently higher for adopter farmers than the control group, promoting SWCMs could help to increase input use efficiency, especially in resource-deprived rain-fed systems in the semi-arid tropics.

Handshaking has a long multi-cultural history. This article focuses upon its diffusion in Britain 1700–1850. Two networks boosted the handshaking salutation. One was a mercantile network, extending across Europe’s urban/commercial regions. The other featured ‘middling sort’ Quaker men and women, who shook hands on principle. Gradually, the salutation became widely diffused – and acquired a range of egalitarian meanings. Handshaking was not an elite practice which ‘trickled down’ to the masses. Instead, it spread by social negotiation both ‘upwards’ and ‘downwards’ from middle-class society. Traditional hierarchy was yielding to an urbanizing and internationalizing world – with multiple individual options.

Terrorist attacks involving children raised concern regarding the preparedness to treat pediatric trauma patients during mass casualty incidents (MCIs). The purpose of this project was to assess the resources available in Milan to respond to MCIs as the 2016 Bastille Day attack in Nice. Literature and guidelines were reviewed and minimal standard requirements of care of pediatric trauma patients in MCIs were identified. The hospitals that took part in the study were asked to answer a survey regarding their resource availability. An overall surge capability of 40-44 pediatric trauma patients was identified, distributed based on age and severity, hospital resources, and expertise. The findings showed that adult and pediatric hospitals should work in synergy with pediatric trauma centers, or offer an alternative if there is none, and should be included in disaster plans for MCIs. Simulations exercises need to be carried out to evaluate and validate the results.

Pulmonary artery banding (PAB) is used to restrict pulmonary blood flow in select patients with large left-to-right intracardiac shunts or unrestrictive pulmonary blood flow prior to eventual surgical repair or palliation. More recently, surgical placement of an internal or intraluminal PAB (IPAB) has been used to restrict pulmonary circulation. Here we present two patients who underwent balloon angioplasty of the IPAB to treat cyanosis and improve pulmonary blood flow.