Oblique Case Research Articles

Proposal to add a Note to Rule 8 of the International Code of Nomenclature of Prokaryotes to clarify the meaning of the term 'stem'.

According to the Rules of the International Code of Nomenclature of Prokaryotes (ICNP) and its appendices, names of higher taxa are formed by the addition of the appropriate suffix to the stem of the name of the type genus, and word stems derived from Latin and/or Greek are combined to compound names by means of an appropriate connecting vowel. The way the word 'stem' is used in the ICNP differs from the meaning of this term in textbooks of Latin and Greek grammar. We therefore propose to add a Note to Rule 8, clarifying that the term 'stem' when used in the ICNP corresponds with that part of the word that does not vary among the forms of the noun in the oblique cases, i.e., cases other than the nominative, and which can be obtained by deleting the ending of the genitive singular.

The morphosyntax of Ezafe in Southern Zazaki

Abstract The present study describes and analyzes the morphosyntactic expression of the Southern Zazaki Ezafe – a linking element in the nominal domain common among Iranian languages. This morpheme is used to link modifiers (i.e. adjectives and possessors) to their head nouns as follows: n-ez1 mod1-ez2 mod2-ez3 mod3. Southern Zazaki, like other languages of the Kurdish region (and unlike, e.g. Persian) reflects phi-features (and case) of the head noun on each Ezafe morpheme in a noun phrase. This paper is focussed around two morphosyntactic puzzles that arise in Southern Zazaki. First, while the Ezafe marker in general reflects the case of the entire DP, the presence of a possessor produces invariant oblique case, regardless of the case value assigned to the DP externally (Paul, Ludwig. 2009. Zazaki. In Gernot Windfuhr (ed.), The Iranian languages, 545–586. Routledge; Todd, Terry Lynn. 2002. A grammar of Dimili. Also known as Zaza. Stockholm: Iremet Forlag; Toosarvandani, Maziar & Coppe van Urk. 2014. The syntax of nominal concord: What Ezafe in Zazaki shows us. Proceedings of NELS 43(2). 209–220 i.a.). Second, Southern Zazaki uniquely employs a separate series of “D-form” Ezafe morphemes in certain syntactic contexts (Keskin, Mesut. 2010. Zazaca üzerine notlar (Notes on Zazaki). In Şükrü Aslan (ed.), Herkesin Bildiugi Sır: Dersim. Iletisim, 221–244; Paul, Ludwig. 2009. Zazaki. In Gernot Windfuhr (ed.), The Iranian languages, 545–586. Routledge; Todd, Terry Lynn. 2002. A grammar of Dimili. Also known as Zaza. Stockholm: Iremet Forlag; Werner, Brigitte. 2018. Forms and meanings of the Ezafe in Zazaki. In Saloumeh Gholami (ed.), Endangered Iranian languages. Reichert Verlag i.a.). This study aims to provide a cohesive analysis of Ezafe in Southern Zazaki both with respect to its general phi- and case-sensitive realizations, as well as the distribution of D-forms.

Assimilating mean velocity fields of a shockwave–boundary layer interaction from background-oriented schlieren measurements using physics-informed neural networks

We propose a novel method to reconstruct mean velocity fields of turbulent shockwave–boundary layer interactions (SBLIs) from background-oriented schlieren (BOS) measurement data using physics-informed neural networks (PINNs). By embedding the compressible Reynolds-Averaged Navier–Stokes equations into the PINN loss function, we recover a full set of physical variables from only the density gradient as training data. This technique has the potential to generate velocity fields similar to particle image velocimetry (PIV) results from usually simpler planar BOS measurements, at the cost of some computational resources. We analyze our method's capabilities on two oblique SBLI cases: a high-fidelity Mach 2.28 direct numerical simulation dataset for validation and a Mach 2.0 wind tunnel experiment. We demonstrate the positive impact of different wall boundary constraints such as the wall shear stress and pressure distribution for enhancing the PINN's convergence toward physically accurate solutions. The predicted fields are compared with experimental PIV and other point measurements, while we discuss the accuracy, limitations, and broader implications of our approach for SBLI research.

Enhancing the SST turbulence model for predicting heat flux in hypersonic flows through symbolic regression

In the context of hypersonic flows, shock-wave/turbulent boundary-layer interactions (SWTBLIs) can lead to substantial aerodynamic heating. The commonly used Reynolds-averaged Navier–Stokes (RANS) method in engineering applications faces challenges in accurately predicting heat transfer in these conditions, as the assumptions made by Morkovin’s assumption in the RANS method are not applicable in hypersonic SWTBLI flows. This article addresses these challenges by introducing a variable turbulent Prandtl number (Prt) model for non-adiabatic walls, established through field inversion and symbolic regression (SR) techniques. The methodology begins with field inversion for an oblique SWTBLI case at Mach 5. The corrected field, denoted as β(x), obtained from this inversion, is integrated with selected local flow characteristics to derive a corrected expression using SR. Following the necessary adjustments, this expression is incorporated into the RANS solver. Various cases with different wall cooling ratios, Mach numbers, and Reynolds numbers are chosen to assess the generalization ability of the variable Prt model. The outcomes demonstrate a substantial improvement in the model’s ability to predict heat transfer in hypersonic SWTBLI flows without compromising the baseline model’s performance in predicting the undisturbed boundary layer. The correction effect remains notably enhanced even in complex three-dimensional cases.

Some Remarks on the Proto-Middle Persian Inscription Persis 2 and the Oblique Case

This article deals with a pre-Sasanian inscription written in Middle Persian script recently published by N. Sims-Williams, who named it ‘Persis 2’. First, some observations on the reading and interpretation of the text are proposed. Then, it is argued that the instances of final -y in this inscription could correspond to a phonetic notation of the oblique singular ending -ē, hitherto only reconstructed for proto-Middle Persian. Finally, a discussion on the origin of heterographic writing with respect to the graphical representation of Iranian morphological endings is proposed, in the attempt to explain why a final -y for the ending -ē is not regularly noted in all the comparable documents from the middle Arsacid period.

Ezafe in Zazaki

This chapter describes the Ezafe construction in Zazaki in which all nominal and non-nominal modifiers, including possessors, appear in the postnominal position and are linked to their head noun with the Ezafe marker. Ezafe in this language displays distinguishing properties such that it not only inflects for the phi-features and the definiteness of the head noun, but it also reflects the case that the whole noun phrase receives in the clause. The Direct and Oblique case distinctions observed in this language are thus reflected on the Ezafe forms in relevant syntactic positions. Besides, there is a separate series of Ezafe forms, which we refer to as D-forms, used only in Southern Zazaki whenever a modified noun phrase serves as the possessor or as the complement of certain adpositions, or after the indefinite suffix in the context of indefiniteness.

Contact interaction and wear of beam supports resting on a frictional substrate

The frictional contact response of a beam with attached spherical indenters and supported on a plane substrate is considered for periodically varying normal load. An oblique loading case then occurs as the structural load induces both normal and tangential forces on the contact zone. The cyclic tangential sliding and spin of indenter on the substrate are then accompanied by evolving contact zone related to load variation. Rigid-sliding and slip-sliding friction models have been used to describe analytically cyclic contact response, load-deflection hysteretic relation, wear scar evolution and dissipated energy per cycle assuming linear-elastic material model. The analytical solution has been verified by experimental tests providing data on mechanical response, load-deflection diagrams illustrating transient and steady states and wear scar evolution. The effect of wear debris adhesively bonded to the indenter was found to be essential for increasing friction and wear. The relation of wear volume to the dissipated energy is presented. The analysis is aimed to develop a new type of wear tester applicable to oblique loading cases.

Cuvinte create din sintagme și din forme oblice latinești

This paper aims to analyze from a lexical and etymological perspective words ultimately derived from Latin phrases (e.g., the Romanian noun parabelum, which is ultimately derived from the Latin phrase si vis pacem, para bellum) on the one hand, and, on the other hand, from Latin lexical forms that were declined in oblique cases and that were preserved as such (e.g., the Romanian noun omnium, that is derived – indirectly- from Latin omnium, which is the plural genitive form of the Latin pronoun omnis, omne). Our study shows that this type of vocabulary enrichment has the potential to be a creative, ludic and a very productive one; at the same time, it proves that the Latin language will continue to represent- a copious treasure-trove for modern languages.

Effects of pulse-like ground motions on tunnels in saturated poroelastic soil for obliquely incident seismic waves

It has been widely recognised that near-fault ground motions can be distinctly different from far-fault ground motions, in terms of their amplitudes and spectral characteristics, and there are a number of studies investigating the effects of near-fault ground motions on the structural response. However, only a few studies focus on underground tunnels, and most of them consider vertically incident seismic waves, neglecting the wave passage effect which is critical for long tunnels. This paper investigates the consequences of near-fault pulse-like ground motions on the seismic tunnel response, with an example of a tunnel embedded in saturated poroelastic soil. The input motions are represented by obliquely incident P1 waves, and the wave passage effect along the longitudinal direction is considered by a 2.5D modelling technique. The seismic tunnel response for near-fault pulse-like and far-fault ground motions is compared. Additionally, artificial ground motions, which have consistent acceleration response spectra with the near-fault pulse-like ground motions, but without velocity pulses, are generated to gain further insight into the contribution of velocity pulses. It is shown that the near-fault pulse-like ground motions can noticeably increase the tunnel internal forces, due to large seismic energy associated with the velocity pulses. For pulse-like ground motions with similar acceleration response spectra, the fling-step velocity pulse can be more detrimental to the tunnel than the forward-directivity velocity pulse. Moreover, the amplification effect of the near-fault pulse-like ground motions on the tunnel internal forces tends to be more prominent for large vertical angles of incidence, highlighting the significance of considering the oblique incidence case for seismic design.

Experimental and numerical study of wave-in-deck loads due to oblique transient wave groups

Wave-in-deck loads due to 45° oblique transient focus wave groups are investigated using model-scale experiments and computational fluid dynamics simulations with emphasis on comparing with head-on wave impacts for a solid cuboid deck model without and with an I-beam grillage beneath. After validation with experiments, numerical results are extended to consider wave-in-deck loads with 22.5° and 67.5° oblique wave directions. Generally, the head-on wave impacts cause larger longitudinal forces on the deck whereas the oblique cases result in larger downward vertical forces. For the deck with grillage case, Santo et al. (2020) and Wang et al. (2022) show that successive large spikes are observed in the force time series of head-on wave impact due to entrapped air-pocket effects in the grillage. However, here it is found that the large spikes are absent in the force time series for the oblique wave impacts and the patterns of forces are similar to the deck without grillage with rather small or no spikes in the force time series. Interrogation of the numerical flowfield reveals evidence that the asynchronous and less effective air entrapment in the grillage for the oblique cases are responsible for the difference. The maximum positive pressure on the underside of the deck is found to be much larger for the deck with grillage than without due to local slamming of jets formed in the grillage.

Precipitation Rates of Electrons Interacting With Lower‐Band Chorus Emissions in the Inner Magnetosphere

AbstractElectrons trapped in the Earth's magnetic field can be scattered by whistler mode chorus emissions and precipitate into the Earth's upper atmosphere. Whistler mode chorus waves propagating in the Earth's inner magnetic field are usually observed with oblique wave normal angles (WNAs). In this study, we apply 12 chorus wave models with four various WNA sets (the maximum WNA are 0°, 20°, 60°, and 90% of resonance cone angles) and three wave amplitude sets (the maximum wave magnetic fields are 2.1 nT, 307 pT, and 49.4 pT) at L = 4.5. We use test‐particle simulations to trace electrons interacting with the waves and create Green's function sets for electrons initially at kinetic energies (K) 10–6,000 keV and equatorial pitch angles (α) 5°–89°. The simulation results show that in the 2.1 nT cases, the very oblique chorus waves contribute to more electron precipitation than the other three chorus wave models, especially at energies 50–100 keV. Checking the highest initial equatorial pitch angle of the precipitated electrons, we find that the very oblique chorus waves can precipitate electrons with α > 45°. In contrast, the other chorus waves can only precipitate electrons with α < 30°. Furthermore, the precipitation rates reveal that the anomalous trapping effect, which moves low equatorial pitch angle electrons away from the loss cone, in the oblique cases is much weaker than in the parallel case, resulting in higher precipitation rates. Finally, we derive the pitch angle scattering rates and verify the precipitation by nth cyclotron resonances with oblique chorus.

Resonantly interacting lump chains in the Mel'nikov equation

We constructed resonant lump chain solutions to the Mel'nikov equation by utilizing Hirota bilinear approach, mainly includes the resonance between lump chains, resonance between lump and lump chains. By calculating the asymptotic form of the solution, the resonant interaction of these chains results in infinite phase shifts, which is analogous to the line soliton interactions in the Kadomtsev-Petviashvili-II equation. The interactions are classified into two types, oblique and parallel cases, depending on the velocities of the individual lump chains. Our study highlights several cases of obliquely collided lump chains with a Y-shaped structure. Furthermore, the parallel resonance of lump chains can lead to the transmission, splitting, or absorption of another lump chain. The interactions between lump and lump chains are classified into two types, lump is semi-localized in time or completely localized in time.

Turbulent Drag Reduction by Travelling Waves of Spanwise Lorentz Force

Travelling waves induced by spanwise Lorentz force for skin-friction drag reduction are studied in the present work using direct numerical simulations, with particular focus on the streamwise and spanwise travelling waves. The overall picture of drag reduction in the frequency-wavenumber parameter space, omega -kappa _x-kappa _z is uncovered. It is found that both drag reduction maps for the streamwise and spanwise travelling waves are featured with a drag reduction (mathcal{D}mathcal{R}) region and a drag increase (mathcal{D}mathcal{I}) region. For the streamwise travelling wave of spanwise Lorentz force, the mathcal{D}mathcal{R} and mathcal{D}mathcal{I} regions are located in the same parameter regime compared to that of the streamwise travelling wave of spanwise wall velocity, while for the spanwise travelling wave, the mathcal{D}mathcal{R} variation at any fixed kappa _z is similar to that of spanwise oscillating Lorentz force. An exploration of the oblique travelling wave with an angle to the mean flow shows that the optimal drag reduction appears when the wave travels backward relative to the flow direction, and the "ribbon" structure is a general phenomenon appearing in all oblique travelling wave cases. The ensemble averaged positive and negative quasi-streamwise vortices become asymmetric when the travelling wave is imposed, and the near-wall high- and low-speed streaks are significantly tilted in the spanwise direction. Spanwise oscillation, streamwise and spanwise travelling waves share strong similarity in the statistics, energy spectra as well as turbulent structure modulation.

Fundamental Study on Grasping Growth State of Paddy Rice Using Quad-Polarimetric SAR Data

In this brief paper, we examine polarimetric scattering characteristics for understanding seasonal change of paddy rice growth by using quad-polarimetric synthetic aperture radar (SAR) data in the X-band. Here we carry out polarimetric scattering measurement for a simplified paddy rice model in an anechoic chamber at X-band frequency to acquire the the quad polarimetric SAR data from the model. The measurements are performed several times for each growth stage of the paddy rice corresponding to seasonal change. The model-based scattering power decomposition is used for the examination of polarimetric features of the paddy rice model. It is found from the result of the polarimetric SAR image analysis for the measurement data that the growth state of the paddy rice in each stage can be understood by considering the ratio of the decomposition powers, when the planting direction of the paddy rice is not only normal but also oblique to radar direction. We can also see that orientation angle compensation (OAC) is useful for improving the accuracy of the growth stage observation in late vegetative stage for oblique planting case.

A Semianalytical Method for Electromagnetic Scattering by Infinitely Long Arbitrary Shaped Multilayer Cylinders at Oblique Incidence

A simple and fast method for determining the field scattered from an infinite, arbitrary-shaped multilayer cylinder that is obliquely illuminated by a TMz plane wave is presented. The proposed method is a generalization of the meshless method that was previously introduced for the normal incidence case. The main structure of the procedure is similar to the one given for the normal incidence case. However, in the oblique incidence case, the problem cannot be handled as a scalar problem by considering only one field component, namely, <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$E_{\text {z}}$ </tex-math></inline-formula> for a TMz plane wave. Accordingly, all components of both the electric and magnetic field vectors are involved in the procedure and at each layer, and they are expressed as series of cylindrical functions with unknown coefficients. These coefficients are determined through the solution of a linear system of equations, which is constructed by first enforcing the continuity of the tangential components of the electric and magnetic field vectors on each boundary between the layers, then expressing the cylindrical functions in these continuity relations as Fourier series, and using the orthogonality of complex exponentials. After determining the coefficients, all field components at any point can be easily computed through the series representations.

Case as an Anaphor Agreement Effect: Evidence from Inuktitut

The anaphor agreement effect (AAE) is the crosslinguistic inability for anaphors to covary with φ-agreement (Rizzi 1990, Woolford 1999); languages use various strategies that conspire to circumvent this effect. In this squib, I identify and confirm a prediction arising from two previous observations by Woolford (1999) concerning the scope of the AAE, based on new evidence from Inuktitut (Eastern Canadian Inuit). I propose that anaphors in Inuktitut are lexically specified as projecting additional syntactic structure, spelled out as oblique case morphology; because φ-Agree in Inuktitut may only target ERG and ABS arguments, encountering an anaphor inevitably leads to failed Agree in the sense of Preminger 2011, 2014. I moreover argue that this exact AAE pattern is previously unattested, yet is predicted to arise given the range of existing strategies. Finally, this squib provides evidence against previous detransitivization-based approaches to reflexivity in Inuktitut (e.g., Bok-Bennema 1991).

The Morphology of Case and Possession in Balkar: Evidence that Oblique Cases Contain Accusative

This paper uses facts about case allomorphy and possessive morphology in Balkar, a Turkic language spoken in southern Russia, to contribute to the examination of the internal structure of case. A number of recent findings in morpho-syntactic research indicate that case markers have a richer internal structure than their surface appearance typically suggests. Specifically, many works in this vein argue based on cross-linguistic facts about phenomena such as suppletion and syncretism that case features are organized into an implicational containment hierarchy. In this hierarchy, accusative case contains the features of the nominative, and the accusative is itself a sub-part of oblique cases. Many arguments for case containment have relied on diagnostics that are less direct than surface-level morpho-syntactic analysis. In this paper, I argue that there is a part of Balkar grammar that shows the containment of accusative case by obliques in a surface-evident way. While such containment is not normally evident in Balkar, I argue that in certain possessed oblique NPs we see an overt expression of the accusative, except when phonological factors interfere. I go on to discuss other related topics about Balkar and the case containment hypothesis more generally.

Study on Disaster Mechanism of Oil and Gas Pipeline Oblique Crossing Landslide

Landslides are one of the most serious geological disasters in oil and gas pipelines. According to investigations, the cross-cutting relationship between landslides and pipelines can be divided into three types: pipeline longitudinal crossing landslide, pipeline transversely crossing landslide, and pipeline oblique crossing landslide. This different cross-cutting relationship is one of the important factors affecting pipeline landslide disasters. As a result, it is necessary to study the stress and deformation characteristics of oil and gas pipelines under different cross-cutting relationships, which is of great significance for the prevention and control of oil and gas pipeline landslides. In this paper, an ideal pipe-soil coupling interaction model of oil and gas pipeline oblique crossing landslide was established using FLAC3D. The influence of the buried depth of the pipeline, the displacement of the sliding body, and the different intersection angles of landslide and pipeline on the deformation and stress of the pipeline under the action of a landslide is analyzed, and a typical case of pipeline oblique crossing landslide is used for analysis. The results demonstrated that the stress of pipeline oblique crossing landslide is complex, and the stress concentration is obvious at the shear outlet and the trailing edge of the landslide. The stress at the shear outlet is the largest, which should be regarded as the key location. The displacement and stress of pipeline oblique crossing landslide are obviously affected by the displacement of the sliding body and the buried depth of the pipeline. The displacement and stress of the pipeline increase significantly with the increase of the displacement of the sliding body. With the increase of pipeline buried depth, the displacement of the pipeline shows an overall decrease, and when the buried depth of the pipeline is 3–3.5 m, the displacement and stress are close to the peak, indicating that the buried depth is of great risk. The intersection angle between the pipeline and landslide has a significant effect on the stress of the pipeline. The smaller the intersection angle, the safer the pipeline is.

Cheaper, Wide-Band, Ultra-Thin, and Multi-Purpose Single-Layer Metasurface Polarization Converter Design for C-, X-, and Ku-Band Applications

This article presents the design of wide-band, ultra-thin, and multi-purpose polarization converter utilizing metasurface for C-, X-, and Ku-band applications. Having a topology on a FR-4 substrate with metasurface metallic patterns on the front and an all-metallic surface finish on the back, the unit cell of converter design has symmetry in the x−y plane with unique features of having both linear polarization (LP) and circular polarization (CP) property. While the polarization conversion ratio (PCR) of converter in normal incidence case is more than 90% in three different frequency bands of 6.46–6.78 GHz, 10.52–11.85 GHz, and 16.49–17.37 GHz, it shows linear-to-linear polarization feature and a linear-to-circular polarization feature with left-handed circular polarization (LHCP) for the frequency range between 7.28 and 9.40 GHz and right-handed circular polarization (RHCP) for the frequency range between 13.38 and 15.19 GHz. It is also seen that the converter has a PCR value of around 90% for oblique incidence case with incidence angles up to 45°. Extensive simulations have been conducted to prove the performance of suggested converter with the aid of a commercially-available simulation platform, called CST Microwave Studio. The advantages of suggested polarization converter are low-cost, wide-band, ultra-thin, and having both LP and CP conversion in C-, X-, and Ku-bands.

Design of Euplectella aspergillum based bionic thin tubes for impact absorbing application under different loading conditions

In this study, Euplectella aspergillum based thin tubes is modeled to increase the energy absorption performance. Two bio-inspired lattice structures are incorporated into the circular cross-section thin tubes. The study aims to obtain shorter wave folding and reduce the difference between peak crushing force (PCF) and mean crushing force (MCF). The modeled tubes have multi-cellular thin walls and lattice sandwich thin walls. All the tubes are tested under high-impact axial and varying oblique loading cases using finite element modeling (FEM). The study shows mainly local buckling behavior with the number of folding, fluctuation in energy absorption, and axisymmetric deformation dependent on the length, height of the unit cells, and type of loading. A parametric study shows the possibility of engineering the crashworthiness based on the unit cell design parameters. Furthermore, the experimental validation of the FEM results is carried out with the selective laser melting (SLM) process fabricated bionic tubes of Al–Si10–Mg alloy. The FEM and experimental results showed good agreement. Bionic tubes offer potential applications in advanced automobile crash boxes and lightweight structure designs.