Impact of the Minimum Head on Low-Head Hydropower Plants Energy Production and Profitability

In Poland, existing barrages are characterized by relatively high flow and low head, which is challenging for the effective utilization of theoretical watercourse power. The paper presents the impact of the minimum head of the hydro sets on the annual electricity production of small hydropower plants at low-head locations for two types of water turbines: Archimedes and Kaplan turbines. A developed mathematical model was used to simulate energy yield from Archimedes and Kaplan turbines for a given value of the minimum technical head, depending on the number of installed hydro sets. For economic analysis purposes, the levelized cost of electricity (LCOE) and net present value (NPV) indicators were calculated. The conducted research allowed for comparing Archimedes and Kaplan’s turbine operating conditions and how the minimum head parameter influences their electricity production and utilization time. As concluded in the results, the influence of minimum head in energy production is more distinct for the Archimedes screw technology than for the Kaplan turbine. The research shows that the decrease in energy production associated with the hydro unit’s minimum head parameter is from 0% to 30% for Kaplan, and it is 6% to 52% for Archimedes turbines.

An Optimal Cluter Head Parameter in Leach Protocol of Wireless Sensor Networks

In wireless sensor networks, LEACH is often used as an energy saving protocol and extends the network life. However, there are many parameters that affect the performance of the LEACH protocol, one of which is the number of cluster heads. This paper proposes a simple and efficient solution to determine the optimal number of cluster heads in the LEACH protocol. For the proposed solution, the system can achieve the optimal performance between the longest lifetime in the constraint as the largest amount of data transmitted in the network.

On the decline of edge-fronting from Latin to Romance

Discontinuous structures produced by edge-fronting represent one distinctive feature of Latin regarding Romance. This difference follows from the head parameter: whereas Romance is consistently head-initial, Latin fluctuates between different settings as a result of its occupying an intermediate position in the gradual shift from head-finality to head-initiality. In turn, this difference in the head parameter is responsible for the observed variation in edge-fronting, since its setting determines the application of antilocality in constraining movement. Concretely, if head-finality is the output of a roll-up operation raising the complement to the specifier to the left of its head, suspension of antilocality constitutes a sine qua non for head-final languages like Latin. In Romance, by contrast, the head parameter is aligned with the head-initial setting such that roll-up (hence antilocal) movement never arises. This investigation thus derives from the different settings of the head parameter a concomitant parametrization in the role of antilocality.

Investigating Iraqi EFL College Students’ Ability of Parametric Resetting

This paper tries to answer whether Iraqi EFL college students are able to reset the parametric values of their native Arabic into those which suit English. It aims at enhancing Iraqi students' knowledge of some of the parametric values of English via tackling three parameters: Null-subject parameter, Head-parameter, and Serial parameter. To achieve the aim of this study, Grammaticality Judgment Tasks are administered to sixty students of the fourth year at the Department of English- College of Languages/ University of Baghdad for the academic year 2016-2017. The students' responses have been corrected and statically analysed. The study concludes that Iraqi EFL students' ability to reset parameters varies as to the parameter in question since they have succeeded to reset the Head parameter, but failed to reset the Serial parameter; this is accompanied by a partial ability to rest the Null-subject parameter. As well, it has further been revealed that Iraqi EFL students' inability to reset a parameter is due to negative transfer from Arabic to English, hence EFL learners need be exposed to extensive input data to encourage the resetting of parameters.

Diachronic interpretations of word order parameter cohesion

This chapter uses statistical tools to investigate the interrelationship between typological features in the World Atlas of Language Structures Online (Dryer and Haspelmath 2013) in the WALS 201 language sample, with the objective of determining how crosscategorial word order generalizations might emerge as the result of syntactic change. Multiple Correspondence Analysis and a variety of cluster analyses show that word order features tend to group along the familiar lines of the Head Parameter. But there is an important caveat to this, previously noticed by Albu (2006): word order features in NP (e.g. [Order of noun and determiner], [Order of noun and adjective]) group separately from word order features in VP and PP, with the exception of [Order of noun and genitive]. We provide a diachronic explanation for this fact: nouns and their arguments may be reanalysed as PPs, or in the case of reanalysed nominalizations, clauses.

Structure of numerals and classifiers in Chinese

It is controversial whether a classifier (C) or measure word (M) in Chinese forms a constituent first with Num (numeral) or N in a [Num C/M N] phrase. This paper reviews evidence for the [Num C/M] constituency from modern Chinese and then provides evidence from historical and typological perspectives. Under the [Num C/M] constituency, not only the C/M word orders attested in Chinese history, but also all those attested elsewhere, can be straightforwardly accounted for by the head parameter, while such simplicity is unattainable under the [C/M N] constituency. In addition, fresh evidence is obtained from the internal word order within a complex numeral; e.g. san-shi ‘30’ is base-final, with n (3) and base (10) entering into a multiplicative function, 3×10. The same multiplicative function exists between Num and C/M, e.g. san-duo hua ‘3 C flower’ = 3×1 flower, and san-da hua ‘3 dozen flower’ = 3×12 flower. C/M and bases are thus unified as multiplicands, an insight further supported by the consistent correlation between the base-final order and the C/M-final order throughout the history of Chinese. A closer examination of the 103 classifier languages in Greenberg (1990[1978]) further reveals that, among the 52 languages whose numeral systems and C/M word orders can be obtained, the synchronization between the numeral base and C/M is nearly universal. The base-C/M unification as multiplicands and base-C/M synchronization in word order strongly suggest that Num and C/M form a single constituent.