the structure and properties of niobapyrimidinium complex were examined by density functionaltheory method (mpw1pw91). the effect of solvent on the structural parameters, frontier orbitalenergies and hyperpolarizability (
tot) of this molecule has been explored. the thermodynamicproperties of the title compound at different temperatures have been calculated. also, the parasubstitutionseffect on...

This study examines the impact of participation in short supply chains (SSCs) on technical efficiency (TE) and technological change (TC) cucumber production China, using data for period 2011–2016. The meta-frontier model two-stage residual inclusion approach are utilized to examine association between SSC participation, comparable TE, TC. Accounting selection bias, we show that significantly de...

The paper provides findings on the technical efficiency of European dairy processing industry, which is one most important subsectors food industry in Union (EU). ability to efficiently use inputs production outputs a prerequisite for sustainability and competitiveness agri-food sector as well security. Thus, aim this provide robust estimate by employing new advances productivity analysis, inve...

We establish complexities of the conjunctive query entailment problem for classes of existential rules (i.e. Tuple-Generating Dependencies or Datalog+/rules). Our contribution is twofold. First, we introduce the class of greedy bounded treewidth sets (gbts), which covers guarded rules, and their known generalizations, namely (weakly) frontier-guarded rules. We provide a generic algorithm for qu...

The field of production frontier estimation is divided between the parametric Stochastic Frontier Analysis (SFA) and the deterministic, nonparametric Data Envelopment Analysis (DEA). This paper explores an amalgam of DEA and SFA that melds a nonparametric frontier with a stochastic composite error. Our model imposes the standard SFA assumptions for the inefficiency and noise terms. The frontier...

Consider a planar Brownian motion run for finite time. The frontier or “outer boundary” of the path is the boundary of the unbounded component of the complement. Burdzy (1989) showed that the frontier has infinite length. We improve this by showing that the Hausdorff dimension of the frontier is strictly greater than 1. (It has been conjectured that the Brownian frontier has dimension 4/3, but ...

This paper examines several extensions of the stochastic frontier that account for unmeasured heterogeneity as well as firm inefficiency. The fixed effects model is extended to the stochastic frontier model using results that specifically employ its nonlinear specification. Based on Monte Carlo results, we find that the incidental parameters problem operates on the coefficient estimates in the ...

Abstract Purpose for Review Sleep deprivation and insomnia are associated with mortality morbidity worldwide. A pharmacological agent that improves subjective objective measures of sleep, without significant side effects, remains nebulous. However, initial randomised controlled trials suggest Prunus cerasus (tart cherry) ingestion may be beneficial. This systematic review meta-analysis evaluate...

The idea of the frontier reflects a uniquely colonial view of a place and process of encounter between colonising people, indigenous inhabitants, and natural landscapes.[1] Within this colonial context, the idea of the frontier has been variously developed through history by natural and social scientists, popular historians, artists, writers, and government officials. This volume draws together...

Frontier-based exploration is the most common approach to exploration, a fundamental problem in robotics. In frontierbased exploration, robots explore by repeatedly detecting (and moving towards) frontiers, the segments which separate the known regions from those unknown. A frontier detection sub-process examines map and/or sensor readings to identify frontiers for exploration. However, most fr...