Computational Perspectives on Phonological Constituency and Recursion

Whether or not phonology has recursion is often conflated with whether or not phonology has strings or trees as data structures. Taking a computational perspective from formal language theory and focusing on how phonological strings and trees are built, we disentangle these issues. We show that even considering the boundedness of words and utterances in physical realization and the lack of observable examples of potential recursive embedding of phonological constituents beyond a few layers, recursion is a natural consequence of expressing generalization in phonological grammars for strings and trees. While prosodically-conditioned phonological patterns can be represented using grammars for strings, e.g., with bracketed string representations, we show how grammars for trees provide a natural way to express these patterns and provide insight into the kinds of analyses that phonologists have proposed for them.

DIGITAL PUMPING UNIT WITH GEAR PUMPS USE TO PROVIDE THE FLOW REQUIRED FOR MOBILE EQUIPMENT WITH HIGH ENERGY EFFICIENCY

In this article, the authors want to present the benefits of digital hydraulics, by presenting a Digital Hydraulic Pumping System (DHPS), consisting of 4 fixed flow pumps, driven by a biaxial electric motor, 4 3/2 on/off electrohydraulic directional valve, 4/2 types electrohydraulic directional valve and a bidirectional hydraulic motor. With the help of a micro-controller, the 4 3/2 electrohydraulic directional valve, which independently control the output of each pump, are operated in a certain sequence, so that a regulation of the flow provided in the system in 15 discrete points is obtained. Due to the construction of the 3/2 electrohydraulic directional valve (electrohydraulic directional valve with port P to T), but also of the microcontroller, a variation of the flow supplied in the system with low energy losses is obtained. This system is designed within the digital hydraulics laboratory of the INOE 2000-IHP Research Institute, in order to obtain preliminary results, which will also lead to its physical realization. The article contains the results obtained by numerical simulation of using Digital fluid power technology in the field of hydraulic drives, systems which have advantages such as: the use of simple, robust components with a high degree of flexibility and programmability.

APPLICATION POSSIBILITIES OF RTLS SYSTEM IN PRODUCTION LOGISTICS

Determining the current position of objects in logistics processes (products, unit loads, forklifts, etc.) is the basis for new process development and optimization opportunities (e.g., development of storage strategy, forklift route planning, etc.) that significantly affect the competitiveness of companies. Background information systems that provide real-time data using localization, - or called RTLS (Real Time Location System),- are becoming more widespread. In the dissertation I summarize the operation, physical realization, conditions of use and advantages of a real-time technology that can be applied to a warehouse serving its production, as well as the steps of a possible implementation.

On the scientific importance of the multivibrator

Purpose This paper aims to present some “natural philosophy” that may be associated with multivibrator. The motivation is given by the exposition work (Mathis, 2019) of Wolfgang Mathis. Design/methodology/approach Considering the multivibrator’s states as a realization of Boolean Logic, the author discusses the logical basics in the scope of physical realization, and Brouwer’s concern regarding the “tertium non datur” principle. Findings A mechanical multivibrator with Coulomb friction is treated to enrich the standard set of the traditional examples. The associated energy analysis lies on the border of Newton’s and Lagrangian’s mechanics. Research limitations/implications It is the author’s own work. The author is limited by his modest abilities, given to him by the Great Lord. Practical implications Teaching and improving engineering understanding of the oscillatory systems. Originality/value Together with Mathis (2019), the present paper outlines the topic of multivibrator as a field having significant heuristic and pedagogical value.

Non-closed acoustic cloaking devices enabled by sequential-step linear coordinate transformations

Hitherto acoustic cloaking devices, which conceal objects externally, depend on objects' characteristics. Despite previous works, we design cloaking devices placed adjacent to an arbitrary object and make it invisible without the need to make it enclosed. Applying sequential linear coordinate transformations leads to a non-closed acoustic cloak with homogeneous materials, creating an open invisible region. Firstly, we propose to design a non-closed carpet cloak to conceal objects on a reflecting plane. Numerical simulations verify the cloaking effect, which is completely independent of the geometry and material properties of the hidden object. Moreover, we extend this idea to achieve a directional acoustic cloak with homogeneous materials that can render arbitrary objects in free space invisible to incident radiation. To demonstrate the feasibility of the realization, a non-resonant meta-atom is utilized which dramatically facilitated the physical realization of our design. Due to the simple acoustic constitutive parameters of the presented structures, this work paves the way toward realization of non-closed acoustic devices, which could find applications in airborne sound manipulation and underwater demands.

Understanding the Operation of Contextual Compatibility through the Relationships among Heritage Intensity, Context Density, and Regulation Degree

It is easy to assume that historic environments consist mainly of traditional pre-modern style buildings; however, contemporary architecture is continuously added to historic environments, and its construction is positively encouraged by international heritage organizations such as UNESCO and ICOMOS. The conditions required for introducing contemporary architecture to historic urban environments manifest through the concept of contextual compatibility. This paper examines the meaning and operation of this compatibility in changing urban historical and cultural environments. It offers an empirical interpretation of ‘compatibility’ using three new conceptual parameters: the level of conservation value and importance designated by the heritage conservation system (heritage intensity), the ratio of contemporary architecture in a historic environment (context density), and the range of controlling measures available for conservation (regulation degree). Based on a content analysis of the relevant literature and a case study of 24 sample sites, this paper illuminates how ‘compatibility’ operates in the field, which sometimes contradicts our common assumptions. The notable findings reveal that heritage intensity and context density in the historical environment are not directly proportional to regulation degree. Meanwhile, low context density tends to correspond with highly detailed regulations and emphasise the physical realization of traditional elements.

Generalizing Wave-Particle Duality: Two-Qubit Extension of the Polarization Coherence Theorem

We present an extension of the polarization coherence theorem (PCT) for the case in which two qubits play similarly important roles. The standard version of the PCT: V2+D2=P2, involves three measures, visibility V, distinguishability D, and the degree of polarization P, all of which refer to a single qubit, regardless of its physical realization. This is also the case with the inequality that is implied by the PCT: V2+D2≤1, which was originally derived in an attempt to quantify Bohr’s complementarity principle. We show that all of these constraints hold true, no matter how the involved qubits are physically realized, either as quantum or else as classical objects.