Relevant bibliographies by topics / X-bar Theory

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'X-bar Theory'

Author: Grafiati
Published: 4 June 2021
Last updated: 18 February 2022

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Journal articles on the topic "X-bar Theory"

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Kornai, András, Geoffrey K. Pullum, and Andras Kornai. "The X-Bar Theory of Phrase Structure." Language 66, no. 1 (March 1990): 24. http://dx.doi.org/10.2307/415278.

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Kornai, András, and Geoffrey K. Pullum. "The X-bar theory of phrase structure." Language 66, no. 1 (1990): 24–50. http://dx.doi.org/10.1353/lan.1990.0015.

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Fitriyani, Dian Zelina, and Dian Zelina Fitriyani. "INTERROGATIVE SENTENCE IN MINANGKABAU LANGUAGE: X-BAR THEORY." RETORIKA: Jurnal Ilmu Bahasa 3, no. 1 (September 27, 2017): 188–200. http://dx.doi.org/10.22225/jr.3.1.229.188-200.

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This study discusses the grammatical function of the question words and the internal structure of interrogative sentence in Minangkabau language. The study of this interrogative sentence structure applies X-bar theory as one of the generative syntax subtheories. The data is gained from the interview of Minangkabau language native speaker and analysed by using the distributional method. The result of the analysis shows that the question words for wh-question has two grammatical functions, specifier and complement. For yes-no question, the question word “iyonyo” has one grammatical function, that is complement. The internal structure of interrogative sentence in Minangkabau language is constructed by specifier, complement, and adverb. Key words: interrogative sentence, question word, Minangkabau language
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Leko, Nedzad. "X-bar theory and internal structure of NPs." Lingua 75, no. 2-3 (July 1988): 135–69. http://dx.doi.org/10.1016/0024-3841(88)90030-7.

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Nunes, Jairo. "Bare X-Bar Theory and Structures Formed by Movement." Linguistic Inquiry 29, no. 1 (January 1998): 160–68. http://dx.doi.org/10.1162/002438998553707.

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LIU, XIAO-HAI, and QIANG ZHAO. "TETRAQUARK $X(ud\bar s\bar s)$ PRODUCTION IN pn → ΛΛX." International Journal of Modern Physics E 18, no. 02 (February 2009): 309–14. http://dx.doi.org/10.1142/s0218301309012331.

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We propose to search for a tetraquark candidate [Formula: see text] in [Formula: see text] or ΛΛKK*. The existence of tetraquark state [Formula: see text] was predicted in the literature due to specific diquark effective degrees of freedom inside hadrons. In order to understand the underlying dynamics for exotic hadrons, a search for the tetraquark [Formula: see text] is strongly recommended. We make an estimate of the production rate of [Formula: see text] in an effective lagrangian theory. The proposed reaction involves two Λ production, of which the narrow widths make it a great advantage in the analysis of the final state missing mass spectrum.
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Ginanti, Indira, and Mulyadi Mulyadi. "Kalimat koordinatif dalam bahasa melayu serdang: Analisis x-bar." LingTera 5, no. 2 (October 23, 2018): 144–53. http://dx.doi.org/10.21831/lt.v5i2.21515.

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Penelitian ini dilakukan untuk mendapatkan hasil dan data untuk mencari dan membedah kalimat koordinatif dalam bahasa Melayu Serdang (BMS) yang menggunakan teori X-bar. Penelitian ini juga bertujuan untuk membuktikan bahwa struktur dalam BMS dan bahasa Indonesia itu tidak berbeda. Baik berdasarkan pola kalimat maupun kontruksinya. Penelitian ini menggunakan metode padan yang memadankan antara bahasa Indonesia dan BMS. Jadi, dalam membedah struktur batin yang terdapat dalam BMS yang menggunakan teori X-bar itu disepadankan dengan bahasa Indonesia. Adapun objek kajian yang ditelaah adalah kalimat koordinatif. Kalimat koordinatif ini tentu memiliki konjungsi koordinatif di dalamnya. Konjungsi koordinatif itu ada bermacam-macam. Ada yang menggunakan kata “bahwa”, “sekiranya”, “tetapi, “dan”, dan konjungsi koordinatif lainnya. Konjungsi koordinatif dalam bahasa Indonesia tersebut disepadankan dengan konjungsi koordinatif dalam BMS. Adapun alat pembedah kalimat-kalimat tersebut dalam BMS adalah teori X-bar. Teori X-bar ini pertama kali ditemukan oleh Chomsky. Dalam teori X-bar, kategori leksikal sebuah kata itu menjadi inti dari frasa, klausa, ataupun kalimat. Kategori leksikal verba itu adalah inti dari frasa verba, nomina adalah inti dari frasa nomina, adjektiva adalah inti dari frasa adjektiva, infleksi adalah inti dari frasa infleksional. AbstractThis research was conducted to get the results and data to find and dissect the coordinative sentence in Serdang Malay Language (SML) by using the X-bar theory. This research also aims to prove that the structure in SML and Indonesian have no different. Both based on sentence patterns and their construction. This research uses a matching method that combines Indonesian language and SML. So, to prove the inner structure contained in SML that uses the X-bar theory, it is compared to Indonesian. The object of the research that was examined by the coordinative sentence. This coordinative sentence certainly has coordinative conjunctions in it. There are various coordinative conjunctions. Some use the words "that", "if", "but", "and", and other coordinative conjunctions. Coordinative conjunction in Indonesian is compared to coordinative conjunction in SML. The dissecting tool for these sentences in SML is the X-bar theory. This X-bar theory was first done by Chomsky. In X-bar theory, the lexical category of a word becomes the core of phrases, clauses, or sentences. The lexical category of verbs is the core of verb phrases, nouns are the core of noun phrases, the adjective is the core of the adjective phrase, inflection is the core of the inflectional phrase.
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Zahra, Soraya Tsamara, and Mulyadi Mulyadi. "KALIMAT TANYA DALAM BAHASA MANDAILING: TEORI X-BAR." RETORIKA: Jurnal Bahasa, Sastra, dan Pengajarannya 12, no. 2 (August 15, 2019): 235. http://dx.doi.org/10.26858/retorika.v12i2.9315.

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Interrogative Sentence in Mandailing Language: X-bar Theory. This study aims to analyze grammatical and lexical structure in interrogative sentence in Mandailing language. The study of this interrogative sentence structure applies X-bar theory as one of the generative syntax subtheories. This type of research includes qualitative research using distributional method. The data were collected through interview and observation. The result of the study showed that the wh-question in Mandailing language had grammatical function as spesifier and komplement, while the total question sentence had a function as a komplement. Interrogative sentence in Mandailing language formed by spesifiers, komplements, and adverb.
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Banakh, Taras, Serhii Bardyla, and Oleg Gutik. "The Lawson number of a semitopological semilattice." Semigroup Forum 103, no. 1 (May 13, 2021): 24–37. http://dx.doi.org/10.1007/s00233-021-10184-z.

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AbstractFor a Hausdorff topologized semilattice X its Lawson number$$\bar{\Lambda }(X)$$ Λ ¯ ( X ) is the smallest cardinal $$\kappa $$ κ such that for any distinct points $$x,y\in X$$ x , y ∈ X there exists a family $$\mathcal U$$ U of closed neighborhoods of x in X such that $$|\mathcal U|\le \kappa $$ | U | ≤ κ and $$\bigcap \mathcal U$$ ⋂ U is a subsemilattice of X that does not contain y. It follows that $$\bar{\Lambda }(X)\le \bar{\psi }(X)$$ Λ ¯ ( X ) ≤ ψ ¯ ( X ) , where $$\bar{\psi }(X)$$ ψ ¯ ( X ) is the smallest cardinal $$\kappa $$ κ such that for any point $$x\in X$$ x ∈ X there exists a family $$\mathcal U$$ U of closed neighborhoods of x in X such that $$|\mathcal U|\le \kappa $$ | U | ≤ κ and $$\bigcap \mathcal U=\{x\}$$ ⋂ U = { x } . We prove that a compact Hausdorff semitopological semilattice X is Lawson (i.e., has a base of the topology consisting of subsemilattices) if and only if $$\bar{\Lambda }(X)=1$$ Λ ¯ ( X ) = 1 . Each Hausdorff topological semilattice X has Lawson number $$\bar{\Lambda }(X)\le \omega $$ Λ ¯ ( X ) ≤ ω . On the other hand, for any infinite cardinal $$\lambda $$ λ we construct a Hausdorff zero-dimensional semitopological semilattice X such that $$|X|=\lambda $$ | X | = λ and $$\bar{\Lambda }(X)=\bar{\psi }(X)=\mathrm {cf}(\lambda )$$ Λ ¯ ( X ) = ψ ¯ ( X ) = cf ( λ ) . A topologized semilattice X is called (i) $$\omega $$ ω -Lawson if $$\bar{\Lambda }(X)\le \omega $$ Λ ¯ ( X ) ≤ ω ; (ii) complete if each non-empty chain $$C\subseteq X$$ C ⊆ X has $$\inf C\in {\overline{C}}$$ inf C ∈ C ¯ and $$\sup C\in {\overline{C}}$$ sup C ∈ C ¯ . We prove that for any complete subsemilattice X of an $$\omega $$ ω -Lawson semitopological semilattice Y, the partial order $$\le _X=\{(x,y)\in X\times X:xy=x\}$$ ≤ X = { ( x , y ) ∈ X × X : x y = x } of X is closed in $$Y\times Y$$ Y × Y and hence X is closed in Y. This implies that for any continuous homomorphism $$h:X\rightarrow Y$$ h : X → Y from a complete topologized semilattice X to an $$\omega $$ ω -Lawson semitopological semilattice Y the image h(X) is closed in Y.
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Budiman, Jaka, and Mulyadi Mulyadi. "Konstruksi Interogatif Bahasa Jepang : Analisis X-Bar." Chi'e: Journal of Japanese Learning and Teaching 8, no. 1 (March 28, 2020): 33–42. http://dx.doi.org/10.15294/chie.v8i1.37327.

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Abstrak Penelitian ini mendeskripsikan mengenai kategori fungsi kalimat interogatif dan merumuskan bentuk kalimat interogatif dalam bahasa Jepang menggunakan teori X-Bar. Dalam penelitian artikel ini, penulis menggunakan metode kepustakaan. Lalu, data dianalisis dengan metode agih dan hasil disajikan menggunakan pemahaman formal dan informal. Hasil menunjukkan bahwa kategori fungsional kalimat interogatif dalam bahasa Jepang meliputi komplemen dan pemerlengkap. Fungsi kalimat interogatif sebagai pemerlengkap ditempati oleh kalimat interogatif ya-tidak dan kalimat interogatif dengan kata tanya, sedangkan kalimat interogatif yang berfungsi sebagai komplemen ditempati oleh kalimat interogatif gaung sehingga dapat dilihat sebagai berikut : KT → [Pm] + Spes + I + Komp + [Pm + Spes + I + Komp]. Kata Kunci : kalimat interogatif, struktur, kategori fungsional Abstract This research are describing about functional category of question and formulated question structure norm in Japanese with X-Bar theory. For this research article, i used library research method. Then, data was analyse with agih method and the result served with formal and informal understanding. The result are showed which question functional category in Japanese question as complement and complementary. The function of question as complementary be occupied by yes-no question and wh question, then question function as complement contained in echo question type as followed : KT → [Pm] + Spes + I + Komp + [Pm + Spes + I + Komp]. Keywords : question, structure, functional category
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Dissertations / Theses on the topic "X-bar Theory"

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TAMADLA, SAID. "X-bar Theory and Standard Arabic." Thesis, Högskolan Dalarna, Engelska, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:du-2897.

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Vallati, Giacomo. "An Account of the move in linguistics from the Standard Social Science Model to Usage-Based." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amslaurea.unibo.it/12694/.

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I start by describing the framework of studies that led to Chomsky’s idea of the genetic component of human language. I then examine his contribution to modern linguistics, the Universal Grammar Theory and X-bar theory. A special place is reserved to John Tooby and Leda Cosmides’ introduction to the 1992 volume The Adapted Mind. I later introduce Pinker’s idea of the language instinct, and then proceed to describe his theory of the language of the mind. I conclude my essay by describing the most recent development in the realm of cognitive studies of language acquisition, usage-based linguistics. The description of the different theories follows the chronological order.
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Santos, AndrÃa Feitosa dos. "Movimento do verbo e categorias vazias em I e V em um fragmento de gramÃtica computacional do portuguÃs." Universidade Federal do CearÃ, 2009. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=4048.

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CoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel Superior
Esse trabalho possui um recorte teÃrico-metodolÃgico que se decompÃe em dois domÃnios complementares: o LinguÃstico e o Computacional/Implementacional. Pelo seu cunho computacional, o escopo primeiro desse trabalho està diretamente ligado ao processamento de lÃngua natural (PLN). Desse modo, implementa-se uma anÃlise sintÃtica automÃtica (parsing) de expressÃes de lÃngua portuguesa em programas da biblioteca em Python do NLTK, cujas anÃlises sÃo representadas em forma de configuraÃÃes arbÃreas que demonstram categorias vazias de sentenÃas finitas do portuguÃs. Ainda pelo cunho computacional, esse trabalho elabora um fragmento de gramÃtica, modelado para capturar traÃos especÃficos da estrutura linguÃstica do portuguÃs, com base no modelo formal de descriÃÃo linguÃstica conhecido como GramÃtica Livre de Contexto (CFG) Baseada em TraÃos, com a finalidade de demonstrar como a biblioteca de programas do NLTK dà suporte à realizaÃÃo dos analisadores sintÃticos na anÃlise da estrutura de traÃos. Pelo seu cunho lingÃÃstico, analisa-se, de acordo com a Teoria X-barra e o Programa Minimalista, frases nas variantes europeia e brasileira da lÃngua portuguesa, obtidas de pesquisas em corpora eletrÃnicos disponÃveis na web. E ainda nesse trabalho, descreve-se e discute-se a categoria IP (sintagma flexional) dentro da sua estrutura hierÃrquica de constituintes, de acordo com a hipÃtese da operaÃÃo sintÃtica de movimento visÃvel e nÃo visÃvel dos elementos linguÃsticos, especificamente o movimento do verbo
This work has a theoretical and methodological framework that is divided into two complementary areas: the Language and Computational/Implementacional. For its computational stamp, the first scope of this work is directly linked to the processing of natural language (PNL). Thus, it implements an automatic syntactic analysis (parsing) of expressions of Portuguese in a computational program from the Python library of NLTK, whose tests are represented in tree configurations that show slash categories of finite sentences of Portuguese. Although the stamp computing, this research elaborates a grammar fragment, modeled to capture specific features of linguistic structure of Portuguese, based on the formal model of description linguistic known as Context Free Grammar (CFG) Based on Features, with the purpose of demonstrate how the library of NLTK programs supports the implementation of parsers for analyzing the feature structure. For its stamp of language, it analyzes, according to X-bar Theory and the Minimalist Program, sentences in European and Brazilian variants of Portuguese, obtained from surveys in electronic corpora available on the web. And this work describes and discusses the category IP (inflectional phrase) within the hierarchical structure of constituents, according to the hypothesis of syntactic operation of visible and invisible movement of elements of language, specifically the movement of the verb
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Santos, Andrea Feitosa dos. "Movimento do verbo e categorias vazias em I e V em um fragmento de gramática computacional do português." http://www.teses.ufc.br, 2009. http://www.repositorio.ufc.br/handle/riufc/2818.

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SANTOS, Andrea Feitosa. Movimento do verbo e categorias vazias em I e V em um fragmento de gramática computacional do português. 2009.96f.Dissertação (Mestrado em Linguistica) – Universidade Federal do Ceará, Departamento de Letras Vernaculas, Programa de Pós-Graduação em Linguística, Fortaleza-CE, 2009.
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This work has a theoretical and methodological framework that is divided into two complementary areas: the Language and Computational/Implementacional. For its computational stamp, the first scope of this work is directly linked to the processing of natural language (PNL). Thus, it implements an automatic syntactic analysis (parsing) of expressions of Portuguese in a computational program from the Python library of NLTK, whose tests are represented in tree configurations that show slash categories of finite sentences of Portuguese. Although the stamp computing, this research elaborates a grammar fragment, modeled to capture specific features of linguistic structure of Portuguese, based on the formal model of description linguistic known as Context Free Grammar (CFG) Based on Features, with the purpose of demonstrate how the library of NLTK programs supports the implementation of parsers for analyzing the feature structure. For its stamp of language, it analyzes, according to X-bar Theory and the Minimalist Program, sentences in European and Brazilian variants of Portuguese, obtained from surveys in electronic corpora available on the web. And this work describes and discusses the category IP (inflectional phrase) within the hierarchical structure of constituents, according to the hypothesis of syntactic operation of visible and invisible movement of elements of language, specifically the movement of the verb
Esse trabalho possui um recorte teórico-metodológico que se decompõe em dois domínios complementares: o Linguístico e o Computacional/Implementacional. Pelo seu cunho computacional, o escopo primeiro desse trabalho está diretamente ligado ao processamento de língua natural (PLN). Desse modo, implementa-se uma análise sintática automática (parsing) de expressões de língua portuguesa em programas da biblioteca em Python do NLTK, cujas análises são representadas em forma de configurações arbóreas que demonstram categorias vazias de sentenças finitas do português. Ainda pelo cunho computacional, esse trabalho elabora um fragmento de gramática, modelado para capturar traços específicos da estrutura linguística do português, com base no modelo formal de descrição linguística conhecido como Gramática Livre de Contexto (CFG) Baseada em Traços, com a finalidade de demonstrar como a biblioteca de programas do NLTK dá suporte à realização dos analisadores sintáticos na análise da estrutura de traços. Pelo seu cunho lingüístico, analisa-se, de acordo com a Teoria X-barra e o Programa Minimalista, frases nas variantes europeia e brasileira da língua portuguesa, obtidas de pesquisas em corpora eletrônicos disponíveis na web. E ainda nesse trabalho, descreve-se e discute-se a categoria IP (sintagma flexional) dentro da sua estrutura hierárquica de constituintes, de acordo com a hipótese da operação sintática de movimento visível e não visível dos elementos linguísticos, especificamente o movimento do verbo
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Kolesnikov, Anton. "Experimental investigation of hydrocarbon formation and transformation under Earth´s upper mantle conditions." Doctoral thesis, KTH, Kraft- och värmeteknologi, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-27017.

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The theory of the abyssal abiotic petroleum origin considers oil and natural gas to begenerated in the Earth’s upper mantle. Hydrocarbons migrate further through the deep faults into the Earth’s crust, where they can form oil and gas deposits in any kind of rock in any kind of structural position. Until recently one of the main obstacles for further development of this theory has been the lack of the data covering processes of generation and transformations of hydrocarbons. Experimental data, presented in this thesis, confirms the possibility of hydrocarbons formation from mantle inorganic compounds (water, Fe, CaCO3 or graphite) at temperature and pressure of the upper mantle (1500 K and 5 GPa). Experiments were carried out in CONAC high pressure device and multianvil apparatus BARS. Compositions of received gas mixtures were similar to natural gas. Quantity of hydrocarbons depended on the cooling regime of reaction mixture under pressure. Slow cooling favored higher quantity. We found that donor of carbon (CaCO3 or graphite) determines formation of “dry” (methane-rich) gas or “wet” (light hydrocarbons-rich) gas. Experiments in laser-heated diamond anvil cells showed that methane and ethane partially react under upper mantle thermobaric conditions (2-5 GPa, 1000-1500 K) to form mixture of hydrocarbons: methane, ethane, propane and n-butane – main compounds of natural gas. Similarity of final product mixture obtained from methane and ethane means thermodynamic stability of hydrocarbons in the thermobaric conditions of the upper mantle and equilibrium character of the observed processes.
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Liu, Zhi Jian, and 劉志堅. "X-bar theory in generative syntax." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/22263485158644029472.

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Books on the topic "X-bar Theory"

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Leffel, Katherine Allyson Gilmore. Free x-bar theory and barriers to movement and government. 1988.

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Book chapters on the topic "X-bar Theory"

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Zagona, Karen. "Auxiliary Verbs in $$ \bar X $$ -Theory." In Verb Phrase Syntax: A Parametric Study of English and Spanish, 27–56. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-2717-9_2.

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Duarte, Inês. "X-bar theory: Its role in GB theory." In Natural Language Processing, 25–54. Berlin, Heidelberg: Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/3-540-53678-7_3.

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Leffel, Katherine. "Free X-Bar Theory, Specificity, and Wh-Movement." In Studies in Natural Language and Linguistic Theory, 113–35. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3196-4_7.

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Kamran, N., and W. F. Shadwick. "The solution of the cartan equivalence problem for $$\frac{{d^2 y}}{{dx^2 }} = F(x,y,\frac{{dy}}{{dx}})$$ under the pseudo-group $$\bar x = \varphi (x),\bar y = \psi (x,y)$$." In Field Theory, Quantum Gravity and Strings, 320–34. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/3-540-16452-9_20.

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Quesada, Luis, Fernando Berzal, and Juan-Carlos Cubero. "A Model-Based Multilingual Natural Language Parser — Implementing Chomsky’s X-bar Theory in ModelCC." In Flexible Query Answering Systems, 293–304. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-40769-7_26.

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Haegeman, L. "X-Bar Theory." In Encyclopedia of Language & Linguistics, 691–704. Elsevier, 2006. http://dx.doi.org/10.1016/b0-08-044854-2/01996-9.

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"X-Bar Theory and Clause Structure." In Representation Theory. The MIT Press, 2002. http://dx.doi.org/10.7551/mitpress/5893.003.0009.

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"An x-bar theory of Government Phonology." In Living on the Edge, 95–130. De Gruyter Mouton, 2003. http://dx.doi.org/10.1515/9783110890563.95.

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Cecchetto, Carlo, and Caterina Donati. "Labels from X-Bar Theory to Phrase Structure Theory." In (Re)labeling, 23–44. The MIT Press, 2015. http://dx.doi.org/10.7551/mitpress/9780262028721.003.0002.

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"From X-Bar Theory to the Lexicalist Hypothesis." In XO. The MIT Press, 2004. http://dx.doi.org/10.7551/mitpress/7335.003.0007.

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Conference papers on the topic "X-bar Theory"

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da Silva, Arnoldo Nunes, Osvaldo de Souza, and Jose Neuman de Souza. "Sentiment Parser based on X-Bar Theory to Brazilian Portuguese." In 2020 International Conference on Computing, Electronics & Communications Engineering (iCCECE). IEEE, 2020. http://dx.doi.org/10.1109/iccece49321.2020.9231145.

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Culpepper, Martin L., and Soohyung Kim. "A Framework and Design Sythesis Tool Used to Generate, Evaluate and Optimize Compliant Mechanism Concepts for Research and Education Activities." In ASME 2004 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/detc2004-57606.

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In 2002, a Microsoft-MIT iCampus effort was initiated to generate methods and tools which accelerate the process by which students and researchers acquire perspective and skill in compliant mechanism design: (1) Experience and skill: A synthesis tool, CoMeT, was developed as a means for researchers and students to gain experience and skill in working with old (education) and new (research) compliant mechanisms. The simulator is based on compliance theory and screw theory. (2) Perspective: A framework, the 5 Fs, was developed to help designers form a holistic perspective on compliant mechanisms. A “big picture” view helps them systematically identify and link the important elements of a compliant mechanism problem. This opens to door for them to properly conceptualize, model and fabricate these mechanisms. In this paper we discuss the work of early compliant mechanism/instrument designers to gain insight into how they thought about, designed and taught others about compliant mechanisms. We explain how their work has influenced the development of our framework and simulator. We then show results obtained by using the framework and simulator at MIT in: (1) Compliant mechanism research: Generation of a compliant mechanism for an R&D 100 award winning, six-axis Nanomanipulator. (2) Compliant mechanism education: Use within student projects to design two devices: A compliant x-y Nanomanipulator with 30×30 μm range and a MEMS accelerometer. Both devices are designed, fabricated and tested in a semester-long class. The paper closes with an appendix which highlights the main steps of a CoMeT study on the screw axis characteristics of a four bar compliant mechanism. The CoMeT simulator and a CoMeT User’s Guide have been made publicly available for academic use at psdam.mit.edu.
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Trofymenko, Sergii. "Coherent X-ray Radiation by an Ultra-relativistic “Half-bare” Electron in Thin Crystal." In 2018 IEEE 17th International Conference on Mathematical Methods in Electromagnetic Theory (MMET). IEEE, 2018. http://dx.doi.org/10.1109/mmet.2018.8460331.

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Tripathi, Ashutosh. "Testing General Relativity with X-ray Reflection Spectroscopy of a ’Bare’ Active Galactic Nucleus." In Revisiting narrow-line Seyfert 1 galaxies and their place in the Universe. Trieste, Italy: Sissa Medialab, 2018. http://dx.doi.org/10.22323/1.328.0037.

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Zhang, Runyu, Huiluo Chen, Sadeq Malakooti, Simon Oman, Bing Wang, Hongbing Lu, and Huiyang Luo. "Quasi-Static and Dynamic Confined Compressive Behavior of Glass Beads by In-Situ X-Ray Micro-Computed Tomography." In ASME 2020 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/imece2020-23399.

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Abstract Granular materials are one of the most important materials in several industries such as civil engineering, agriculture, and energy production. They are a collection of distinct macroscopic particles. Although these materials appear very simple to be described, they exhibit highly different mechanical behavior under quasi-static and dynamic loading conditions. Traditionally, glass beads have been considered as a benchmark granular material for the fundamental understanding of the mechanics of granular materials under complex mechanical loadings. In this study, we intend to characterize the compressive behavior of glass beads under confinement using in-situ X-ray micro-computed tomography at low (quasi-static) and high strain (dynamic) rates. At high strain rates, samples with similar bulk densities to the quasi-static samples are compressed using a long split Hopkinson pressure bar and later imaged with the tomography system to acquire their volumetric images. In the case of low strain rates, a similar sample is compressed, and subsequently, its volumetric images are captured at the same strain level as the dynamically compressed samples using the long split Hopkinson pressure bar. The volumetric images for each case are then analyzed to determine three-dimensional morphologies and to investigate and compare the damage and crushing characteristics of the glass beads at quasi-static and dynamic loading conditions.
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Abushanab, Abdelrahman Hamdi, and Wael I. Alnahhal. "Parametric Study on Moment Redistribution of Fiber Reinforced Concrete Continuous Beams with Basalt FRP Bars." In Qatar University Annual Research Forum & Exhibition. Qatar University Press, 2020. http://dx.doi.org/10.29117/quarfe.2020.0084.

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The state of Qatar is suffering from its harsh environment and coastal conditions, which stand for most of the year. As a result, steel-reinforced concrete structures are subjected to rapid corrosion and deterioration. Therefore, there is a necessity to replace the conventional steel reinforcement by fiber-reinforced polymers (FRP) bars. Apart from FRP bars corrosion resistance, their strength to weight ratio is higher than steel reinforcement, which made the FRP, bars a viable alternative to steel reinforcement. Continuous concrete beams are commonly used elements in structures such as parking garages and overpasses. In such structures, forces could be distributed between the critical sections after cracking. This phenomenon is called moment redistribution. It reduces the congested rebars in connections and enhances the ductility of the members. However, the linear-elastic behaviour of FRP materials makes the ability of continuous beams to redistribute loads and moments questionable. This study aims to investigate the capability of moment redistribution of basalt fiber reinforced concrete (BFRC) continuous beams reinforced with basalt FRP (BFRP) bars. Eleven reinforced concrete (RC) continuous beams of 200 x 300 x 4000 mm were tested up to failure under fivepoint loading. The main investigated parameters were the reinforcement ratio (0.6rb, 1.0rb, 1.8rb and 2.8rb; where rb is the balanced reinforcement ratio), stirrups spacing (80 and 120 mm) and volume fractions of Basalt-macro fibers (BMF) (0.75 and 1.5%). A parametric study was then conducted using a validated finite element (FE) model to extend the investigated parameters that may affect the moment redistribution of RC continuous beams. It was concluded that moment redistribution occurs in beams that have at least a ratio of bottom to top reinforcement of 0.3.
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Agazar, Mohamed, Denis Perrillat, Hanane Saadeddine, Christophe Robert, Laurence Casteignau, and Dominique Fortune. "Study of non-invasive instruments for the measurement of pulsed X-ray high voltage tube." In 19th International Congress of Metrology (CIM2019), edited by Sandrine Gazal. Les Ulis, France: EDP Sciences, 2019. http://dx.doi.org/10.1051/metrology/201902002.

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Non-invasive instruments (kVp meters) are widely used in radiology with diagnostic and guidance systems. Placed in the x-ray beam, they combine detectors and filters, to determine X-ray tube voltage and exposure time, which are the most important quantities in radiology and diagnostic quality control. Calibration of these instruments were limited by reference bench capabilities. General Electric Medical System France and LNE (The national metrology institute in France) have developed a reference bench for the characterization of kVp meters. The set up includes a fast high voltage generator associated with its internal measuring systems and an X-ray tube. The measurements are compared with an invasive reference standard. The set-up is installed in a Faraday cage, precautions have been taken in order to carry out accurate measurements and special adaptations have been made to avoid stray capacitances, which affect the dynamic performance of the generator. Results have shown a good agreement with the internal measuring system of the generator but the kVp meters have shown both good and bad results depending the exposure time, the current and the positioning.
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Spathis, V., and M. C. Price. "Experiments using a light gas gun to investigate the impact melting of gunshot residue analogues." In 2019 15th Hypervelocity Impact Symposium. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/hvis2019-030.

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Abstract In this set of experiments, the versatility of the University of Kent's light gas gun was utilised to obtain a selection of corroborative data regarding the formation and impact of metallic gunshot residues onto high purity silicon wafers. The results from the two experiments are presented. The first experiment investigated how the formation of metallic residues varied as gunshot residue analogues traversed through air under a range of pressures from 0.056 millibar (5.6 Pa) to 1 bar (100 kPa), using solely the energy released during primer ignition; the second involved firing a metallic powder mix of pre-determined composition (via a split-sabot) under vacuum at two velocities- 500 ms-1 and 2000 ms-1. This ensured that there was no ignition or heating of the powders, unlike the first experiment, and so the morphology of the particles collected would be solely due to impact. The residues on the substrates were then analysed using a cold Field Emission Gun Scanning Electron Microscope (FEG) and Energy Dispersive X-ray (EDX) detector. By separating the ignition process of the primers from the residue impacts, it allows for a closer look into the formation of these particles and helps determine whether their varied morphologies are due to the heating caused during the activation and combustion of the primer or whether its due to impact melting. This information can aid in the understanding of metallic particle formation in different pressure environments and give insight into the physical state of firearm residues when they impact a surface. Hydrocode modelling was also incorporated to corroborate the results observed during these experiments and gave results which mimicked the experimental data.
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Heindel, Theodore J., Timothy B. Morgan, Thomas J. Burtnett, Julie K. Bothell, Danyu Li, Alberto Aliseda, and Nathanael Machicoane. "High-Speed Flow Visualization of a Canonical Airblast Atomizer Using Synchrotron X-Rays." In ASME-JSME-KSME 2019 8th Joint Fluids Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/ajkfluids2019-4992.

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Abstract Liquid sprays play a key role in many engineering processes and the dynamics at the nozzle exit have a significant impact on the downstream spray characteristics. However, visualizing the spray in this region is extremely challenging because, under most operating conditions, the spray is optically dense. High intensity white beam X-rays, like those found at the Advanced Photon Source (APS) at Argonne National Laboratory, can be used to produce time-resolved measurements of the liquid-gas structures in the spray near-field region. In this study, high temporal and spatial resolution X-ray images were acquired at the 7-BM beamline at APS of an atomization process using a canonical airblast atomizer consisting of coaxial liquid and gas jets. Unique flow structures were observed under various operating conditions, including bag, ligament, wisp, droplet, and air bubble formation, as well as hollowing of the liquid core into a crown at the liquid needle exit. Conditions where these structures exist are presented and their impact on spray formation are discussed.
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Torelli, Roberto, Yuanjiang Pei, Yu Zhang, Michael Traver, and Sibendu Som. "Cavitation-Suppressing Orifice Design Applied to a Heavy-Duty Diesel Engine Injector Operating With Gasoline." In ASME 2020 Internal Combustion Engine Division Fall Technical Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/icef2020-2994.

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Abstract Measurements of fuel injectors via non-destructive X-ray techniques can provide unique insights about an injector’s internal surface. Using real measured geometry rather than nominal design geometry in computational fluid dynamics simulations can improve the accuracy of the numerical models dramatically. Recent work from the authors investigated the influence of the injector design on the internal flow development and occurrence of cavitation in a production multi-hole heavy-duty diesel injector operating with a straight-run gasoline for gasoline compression ignition (GCI) applications. This was achieved by evaluating a series of design parameters which showed that the intensity and duration of cavitation structures could be mitigated by acting on certain injector parameters such as K-factor, orifice inlet ellipticity, and sac-to-orifice radius of curvature. In the present work, the findings from the previous parametric study were combined to generate two attempts at improving the injector design and numerically evaluate their ability to suppress cavitation inside the orifices at three levels of injection pressure (1000, 1500, and 2500 bar), while operating with the same high-volatility gasoline fuel. Qualitative and quantitative analyses showed that, compared to the results obtained with the original X-ray scanned geometry, the improved designs were able to prevent fuel vapor formation at the two lowest injection pressures and avoid super-cavitation at the higher pressure. It was shown that these results were due to the strong influence that the orifice shape can have on the pressure and fuel vapor volume fraction distributions within the orifices. The informed design choices proposed in this study can therefore be vital for extending the durability and reliability of heavy-duty injectors for GCI applications.
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