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Article

The Interiors of Jupiter and Saturn  

Ravit Helled

Probing the interiors of the gaseous giant planets in our solar system is not an easy task. It requires a set of accurate measurements combined with theoretical models that are used to infer the planetary composition and its depth dependence. The masses of Jupiter and Saturn are 317.83 and 95.16 Earth masses (M ⊕ ), respectively, and since a few decades, it has been known that they mostly consist of hydrogen and helium. The mass of heavy elements (all elements heavier than helium) is not well determined, nor are their distribution within the planets. While the heavy elements are not the dominating materials inside Jupiter and Saturn, they are the key to understanding the planets’ formation and evolutionary histories. The planetary internal structure is inferred from theoretical models that fit the available observational constraints by using theoretical equations of states (EOSs) for hydrogen, helium, their mixtures, and heavier elements (typically rocks and/or ices). However, there is no unique solution for determining the planetary structure and the results depend on the used EOSs as well as the model assumptions imposed by the modeler. Major model assumptions that can affect the derived internal structure include the number of layers, the heat transport mechanism within the planet (and its entropy), the nature of the core (compact vs. diluted), and the location (pressure) of separation between the two envelopes. Alternative structure models assume a less distinct division between the layers and /or a non-homogenous distribution of the heavy elements. The fact that the behavior of hydrogen at high pressures and temperatures is not perfectly known and that helium may separate from hydrogen at the deep interior add sources of uncertainty to structure models. In the 21st century, with accurate measurements of the gravitational fields of Jupiter and Saturn from the Juno and Cassini missions, structure models can be further constrained. At the same time, these measurements introduce new challenges for planetary modelers.

Article

Effective Practices for Teaching Writing to Students with Disabilities in the United States  

April Camping and Steve Graham

Writing is especially challenging for students with disabilities, as 19 out of every 20 of these students experience difficulty learning to write. In order to maximize writing growth, effective instructional practices need to be applied in the general education classroom where many students with special needs are educated. This should minimize special education referrals and maximize the progress of these students as writers. Evidence-based writing practices for the general education classroom include ensuring that students write frequently for varying purposes; creating a pleasant and motivating writing environment; supporting students as they compose; teaching critical skills, processes, and knowledge; and using 21st-century writing tools. It is also important to be sure that practices specifically effective for enhancing the writing growth of students with special needs are applied in both general and special education settings (where some students with disabilities may receive part or all of their writing instruction). This includes methods for preventing writing disabilities, tailoring instruction to meet individual student needs, addressing roadblocks that can impede writing growth, and using specialized writing technology that allows these students to circumvent one or more of their writing challenges.

Article

Semantic Compositionality  

Francis Jeffry Pelletier

Most linguists have heard of semantic compositionality. Some will have heard that it is the fundamental truth of semantics. Others will have been told that it is so thoroughly and completely wrong that it is astonishing that it is still being taught. The present article attempts to explain all this. Much of the discussion of semantic compositionality takes place in three arenas that are rather insulated from one another: (a) philosophy of mind and language, (b) formal semantics, and (c) cognitive linguistics and cognitive psychology. A truly comprehensive overview of the writings in all these areas is not possible here. However, this article does discuss some of the work that occurs in each of these areas. A bibliography of general works, and some Internet resources, will help guide the reader to some further, undiscussed works (including further material in all three categories).

Article

Faultlines  

Keith Murnighan* and Dora Lau

Group faultlines are hypothetical dividing lines that may split a group into subgroups based on one or more attributes. An example of a strong faultline is a group of two young female Asians and two senior male Caucasians. Members’ alignment of age, sex, and ethnicity facilitates the formation of two homogeneous subgroups. On the other hand, when a group consists of a young female Asian, a young male Caucasian, a senior female Caucasian, and a senior male Asian, the group faultline is considered weak because subgroups, regardless of how they are formed, are diverse. As a relatively new form of group compositional pattern, the group faultline is associated with subgroup formation, and these subgroups, rather than the whole group, can easily become the focus of attention. When members strive to obtain more resources and protect their subgroups, between-subgroup conflict, behavioral disintegration, lack of trust, lack of willingness to share information, and communication challenges are likely. As a result, group performance is often negatively affected, and sometimes groups may even be dissolved. These results were repeatedly found in studies of experimental groups, ad-hoc project groups, organizational teams, top management teams, global virtual teams, family businesses, international joint ventures, and strategic alliances.

Article

The Atmosphere of Titan  

Athena Coustenis

Titan, Saturn’s largest satellite, is one of the most intriguing moons in our Solar System, in particular because of its dense and extended nitrogen-based and organic-laden atmosphere. Other unique features include a methanological cycle similar to the Earth’s hydrological one, surface features similar to terrestrial ones, and a probable under-surface liquid water ocean. Besides the dinitrogen main component, the gaseous content includes methane and hydrogen, which, through photochemistry and photolysis, produce a host of trace gases such as hydrocarbons and nitriles. This very advanced organic chemistry creates layers of orange-brown haze surrounding the satellite. The chemical compounds diffuse downward in the form of aerosols and condensates and are finally deposited on the surface. There is very little oxygen in the atmosphere, mainly in the form of H2O, CO, and CO2. The atmospheric chemical and thermal structure varies significantly with seasons, much like on Earth, albeit on much longer time scales. Extensive analysis of Titan data from ground, Earth-orbiting observatories, and space missions, like those returned by the 13-year operating Cassini-Huygens spacecraft, reveals a complex system with strong interactions among the atmosphere, the surface, and the interior. The processes operating in the atmosphere are informative of what occurs on Earth and give hints as to the origin and evolution of our outer Solar System.

Article

Rhetoric  

Thomas H. Ford and Joe Hughes

Rhetoric was—or is, and the uncertainty here is to the point—an unstable but hegemonic assemblage of categories, practices, doctrines, and institutions that endured from classical antiquity through to modernity. Rhetoric underwent radical transformations over this period of nearly three thousand years, entering into complex relationships with its discursive and educational others, including literature, philosophy, theology, and science. Rhetoric has variously been the pragmatic art of verbal action; the teachable (and so saleable) skill of persuasive speaking; an elite training in literary forms and genres inherited from ancient Rome and Greece; a set of protocols governing textual production and reception; the antiquarian collection of ornate and artificial modes of phraseology; a transcendent spirit of linguistic articulation and creation; and a branch of instruction in professional communication. This article presents five scenes—sometimes more tightly focused, sometimes more diffuse—drawn from the long history of rhetoric: a moment of rhetoric’s inception, in Syracuse in 466 bce; of its Christianization, in Milan, 387; of linguistic productivity, in Cambridge, 1511; of rhetorical transcendence, in Basel in 1872; and of social composition, in Minneapolis, 1968. In each of these moments, rhetoric’s conceptual, discursive, and institutional relations with literature were transfigured. They were scenes in which rhetoric was retied, so to speak, into a series of new knots with literature and philosophy. Other scenes and other itineraries would no doubt generate different stories—other knottings of rhetoric and its others.

Article

Morphology and Lexical Semantics  

Réka Benczes

The investigation of morphology and lexical semantics is an investigation into the very essence of the semantics of word formation: the meaning of morphemes and how they can be combined to form meanings of complex words. Discussion of this question within the scholarly literature has been dependent on (i) the adopted morphological model (morpheme-based or word-based); and (ii) the adopted theoretical paradigm (such as formal/generativist accounts vs. construction-based approaches)—which also determined what problem areas received attention in the first place. One particular problem area that has surfaced most consistently within the literature (irrespective of the adopted morphological model or theoretical paradigm) is the so-called semantic mismatch question, which also serves as the focus of the present chapter. In essence, semantic mismatch pertains to the question of why there is no one-to-one correspondence between form and meaning in word formation. In other words, it is very frequently not possible out of context to give a precise account of what the meaning of a newly coined word might be based simply on the constituents that the word originates from. The article considers the extent to which the meaning of complex words is (at least partly) based on nondecompositional knowledge, implying that the meaning-bearing feature of morphemes might in fact be a graded affair. Thus, depending on the entrenchment and strength of the interrelations among sets of words, the meaning of the components contributes only more or less to a meaning of a word, suggesting that “mismatches” might be neither unusual nor uncommon.

Article

glass, Roman  

H.E.M. Cool

Glass came of age during the Roman period. Within the ancient world it had been used from the mid-second millennium bce onwards, but only for jewellery and luxury items like small perfume bottles. This started to change in the late 2nd century bce, when the Hellenistic industries started to produce simple glass drinking vessels. In the early Imperial period there was an explosion in the vessel forms available, in part made possible by the discovery of how to blow glass. The new types included both the luxurious, such as exquisite cameo vessels, and the utilitarian, such as disposable packaging for cosmetics. A similar expansion was seen in its role in buildings, where glass went from luxurious interior decoration to structurally important window glass. References in literary works and depictions in wall paintings at the time attest to the considerable attention this new phenomenon attracted in the early to mid-1st century ce. Vessels, windows and other items spread widely throughout the empire and beyond, and to all levels of society. Over the next 400 years, how the material was used changed with time and place as the various regional industries responded to the needs and preferences of their communities. This was a major high-temperature industry which would have made considerable demands on resources such as fuel, but there are still many things that are unknown about it. Where, for example, was the glass itself made? Waste from secondary workshops producing vessels is regularly encountered, but evidence for the primary production is extremely rare. This has led to considerable debate, with competing models being proposed. Glass is not a material where scientific techniques such as those used to provenance pottery have proved very helpful. The composition of Roman glass is extremely uniform throughout the empire, and again there has been much debate about why this might be. Of late, some useful advances have started to be made in approaching these questions, and this may eventually disentangle what was going on. The study of Roman glass provides a unique window into the past. Through it the impact of new technologies and materials can be seen, as well as the choices people made about what was useful in their lives—all against the background of some of the most beautiful and skilful vessels ever made.

Article

Gender, Law, and Judging  

Susan Haire and Laura P. Moyer

Increased diversity among participants in the justice system, particularly judges, has fueled debates about the values and perspectives that women bring to the law. Difference theories advanced by social psychologists and feminist scholars argue for the premise that men and women in the legal system approach questions of justice differently. By contrast, empirical scholarship offers only limited support for the expectation that the sex of the judge is related to behavioral outcomes. Although most research has not uncovered differences in voting between men and women judges, one area in which consistent differences has been found is in sex discrimination cases. Recent studies suggest, however, that individual differences between men and women judges may emerge if the focus shifts to the litigation process. In one study of trial courts, cases assigned to women judges were more likely to be settled. In another study of appellate courts, women judges were more likely to pen majority opinions that adopted a compromise position. These findings suggest the promise of shifting the analytical focus away from behavioral outcomes to consider whether, and how, women and men in the legal system shape litigation processes. Doing so will require additional data and triangulated approaches that employ both quantitative and qualitative methods. Additional research is also needed to explore how shifts in the gender composition of the bench affect organizational norms and practices in the legal system at the federal, state, and local levels. Some work suggests that gender diversity affects deliberations on small appellate panels and consensual norms on larger courts. As the number of women and minorities appointed by recent Democratic and Republican presidents has increased, scholars are also now well positioned to conduct empirical research with larger numbers to investigate how women of color on the bench differ from white women and minority men.

Article

Composition and Chemistry of the Neutral Atmosphere of Venus  

Ann Carine Vandaele

The atmosphere of Venus is quite different from that of Earth: it is much hotter and denser. The temperature and pressure at the surface are 740 K and 92 atmospheres respectively. Its atmosphere is primarily composed of carbon dioxide (96.5%) and nitrogen (3.5%), the rest being trace gases such as carbon monoxide (CO), water vapor (H2O), halides (HF, HCl), sulfur-bearing species (SO2, SO, OCS, H2S), and noble gases. Sulfur compounds are extremely important in understanding the formation of the Venusian clouds which are believed to be composed of sulfuric acid (H2SO4) droplets. These clouds completely enshroud the planet in a series of layers, extending from 50 to 70 km altitude, and are composed of particles of different sizes and different H2SO4/H2O compositions. These act as a very effective separator between the atmospheres below and above the clouds, which show very distinctive characteristics.

Article

Martian Paleoclimate  

Robert M. Haberle

The climate of Mars has evolved over time. Early in its history, between 3.7 and 4.1 billion years ago, the climate was warmer and wetter and the atmosphere thicker than it is today. Erosion rates were higher than today, and liquid water flowed on the planet’s surface, carving valley networks, filling lakes, creating deltas, and weathering rocks. This implies runoff and suggests rainfall and/or snowmelt. Oceans may have existed. Over time, the atmosphere thinned, erosion rates declined, water activity ceased, and cooler and drier conditions prevailed. Ice became the dominate form of surface water. Yet the climate continued to evolve, driven now by large variations in Mars’ orbit parameters. Beating in rhythm with these variations, surface ice has been repeatedly mobilized and moved around the planet, glaciers have advanced and retreated, dust storms and polar caps have come and gone, and the atmosphere has collapsed and re-inflated many times. The layered terrains that now characterize both polar regions are telltale signatures of this cyclical behavior and owe their existence to modulations of the seasonal cycles of dust, water, and CO2. Contrary to the early images from the Mariner flybys of the 1960s, Mars is and has been a dynamically active planet whose surface has been partly shaped through its interaction with a changing atmosphere and climate system.

Article

Martian Dust  

Steven W. Ruff

Dust makes the red planet red. Without dust, Mars would appear mostly as shades of gray. The reddish hue arises from a small amount of oxidized iron among its basaltic mineral constituents. In this sense, Mars is a rusty world. Martian dust is a ubiquitous material of remarkably uniform composition that spans the globe, filling the skies and covering the land in a temporally and spatially varying manner. It is routinely lifted into the atmosphere via convective vortices known as dust devils. Dust in the atmosphere waxes and wanes according to season. Every few Martian years, the planet is fully encircled in atmospheric dust of sufficient opacity that its surface markings and landforms are completely obscured from view of Earth-bound telescopes and Mars-orbiting satellites. Such global dust events last for weeks or months, long enough to jeopardize solar-powered spacecraft on the surface. Dust particles suspended in the thin Martian atmosphere ultimately fall to the surface, completing the cycle and contributing to a range of features that are still being discovered and investigated.

Article

Teaching Writing in the Digital Era  

Linda Laidlaw

In the digital era, written communication for children and youth is changing. As texts and media include complex intersections of print, image, sound, and other modalities, the ways in which writing is conceived is shifting. The evolution and impact of digital technologies follow a long history of invention, innovation, and change in written communication, with critiques of writing and communication technologies present in both historical and contemporary contexts. A new development in contemporary digital culture is the significant and widespread participation of children and youth in digital media and communication due to the ubiquity, affordances, and appeal of mobile digital devices. In the history of writing instruction, pedagogical approaches and perspectives have continued to evolve, with the teaching of writing at times positioned as subordinate to the teaching of reading, a pattern that has repeated into the digital era in which an emphasis on digital writing production and text creation has been similarly less of a focus than receptive consumption of media. Shifts in digital practice and the emergence of new devices for writing present both challenges and opportunities for the teaching of writing and the creation of texts in schools, with issues of digital resource provision and access to technology presenting hurdles for some teachers. Teacher awareness of the digital worlds, practices, and “funds of knowledge” that students are bringing to the writing classroom is vital to reimagining the writing classroom within contemporary digital culture. In the 21st century, writing instruction needs to be inclusive of the operational demands of writing as well as sociocultural and critical requirements, in addition to responding to fluid technoliteracy contexts and consideration of how “writing” itself is changing.

Article

The History of the National Writing Project  

Anne Elrod Whitney and Yamil Sarraga-Lopez

The National Writing Project (NWP) is a network of professional development sites focusing on the improvement of writing across schools and communities. Its origins as the Bay Area Writing Project led to a professional development model of teachers teaching teachers, a concept that hinges upon recognition of teachers’ knowledge and their capacity to become leaders within their professional community. In the ensuing years, with early financial support from the US government in the form of an initial grant and an eventual direct federal line item, the NWP expanded from one location to over 200 local sites across the USA’s 50 states and territories as well as international sites. These US and international sites, created in partnership with local universities or colleges, offer localized support to teachers of writing. The project’s model involves an intensive summer institute in which teachers spend their time writing, reading, and sharing their knowledge about writing practices and teaching. While its focus is on the teaching of writing across all levels and disciplines, the project has become a model example of a professional learning and development network. As such, the NWP has created a legacy in teacher learning and development that many within the field of teacher professional development wish to emulate. An examination of this history, highlighting the project’s beginnings within the Bay Area Writing Project and its eventual expansion, speaks to the vision that has driven its success.

Article

Idioms and Phraseology  

M. Teresa Espinal and Jaume Mateu

Idioms, conceived as fixed multi-word expressions that conceptually encode non-compositional meaning, are linguistic units that raise a number of questions relevant in the study of language and mind (e.g., whether they are stored in the lexicon or in memory, whether they have internal or external syntax similar to other expressions of the language, whether their conventional use is parallel to their non-compositional meaning, whether they are processed in similar ways to regular compositional expressions of the language, etc.). Idioms show some similarities and differences with other sorts of formulaic expressions, the main types of idioms that have been characterized in the linguistic literature, and the dimensions on which idiomaticity lies. Syntactically, idioms manifest a set of syntactic properties, as well as a number of constraints that account for their internal and external structure. Semantically, idioms present an interesting behavior with respect to a set of semantic properties that account for their meaning (i.e., conventionality, compositionality, and transparency, as well as aspectuality, referentiality, thematic roles, etc.). The study of idioms has been approached from lexicographic and computational, as well as from psycholinguistic and neurolinguistic perspectives.

Article

Meanings of Constructions  

Laura A. Michaelis

Meanings are assembled in various ways in a construction-based grammar, and this array can be represented as a continuum of idiomaticity, a gradient of lexical fixity. Constructional meanings are the meanings to be discovered at every point along the idiomaticity continuum. At the leftmost, or ‘fixed,’ extreme of this continuum are frozen idioms, like the salt of the earth and in the know. The set of frozen idioms includes those with idiosyncratic syntactic properties, like the fixed expression by and large (an exceptional pattern of coordination in which a preposition and adjective are conjoined). Other frozen idioms, like the unexceptionable modified noun red herring, feature syntax found elsewhere. At the rightmost, or ‘open’ end of this continuum are fully productive patterns, including the rule that licenses the string Kim blinked, known as the Subject-Predicate construction. Between these two poles are (a) lexically fixed idiomatic expressions, verb-headed and otherwise, with regular inflection, such as chew/chews/chewed the fat; (b) flexible expressions with invariant lexical fillers, including phrasal idioms like spill the beans and the Correlative Conditional, such as the more, the merrier; and (c) specialized syntactic patterns without lexical fillers, like the Conjunctive Conditional (e.g., One more remark like that and you’re out of here). Construction Grammar represents this range of expressions in a uniform way: whether phrasal or lexical, all are modeled as feature structures that specify phonological and morphological structure, meaning, use conditions, and relevant syntactic information (including syntactic category and combinatoric potential).

Article

The Compositional Semantics of Modification  

Sebastian Bücking

Modification is a combinatorial semantic operation between a modifier and a modifiee. Take, for example, vegetarian soup: the attributive adjective vegetarian modifies the nominal modifiee soup and thus constrains the range of potential referents of the complex expression to soups that are vegetarian. Similarly, in Ben is preparing a soup in the camper, the adverbial in the camper modifies the preparation by locating it. Notably, modifiers can have fairly drastic effects; in fake stove, the attribute fake induces that the complex expression singles out objects that seem to be stoves, but are not. Intuitively, modifiers contribute additional information that is not explicitly called for by the target the modifier relates to. Speaking in terms of logic, this roughly says that modification is an endotypical operation; that is, it does not change the arity, or logical type, of the modified target constituent. Speaking in terms of syntax, this predicts that modifiers are typically adjuncts and thus do not change the syntactic distribution of their respective target; therefore, modifiers can be easily iterated (see, for instance, spicy vegetarian soup or Ben prepared a soup in the camper yesterday). This initial characterization sets modification apart from other combinatorial operations such as argument satisfaction and quantification: combining a soup with prepare satisfies an argument slot of the verbal head and thus reduces its arity (see, for instance, *prepare a soup a quiche). Quantification as, for example, in the combination of the quantifier every with the noun soup, maps a nominal property onto a quantifying expression with a different distribution (see, for instance, *a every soup). Their comparatively loose connection to their hosts renders modifiers a flexible, though certainly not random, means within combinatorial meaning constitution. The foundational question is how to work their being endotypical into a full-fledged compositional analysis. On the one hand, modifiers can be considered endotypical functors by virtue of their lexical endowment; for instance, vegetarian would be born a higher-ordered function from predicates to predicates. On the other hand, modification can be considered a rule-based operation; for instance, vegetarian would denote a simple predicate from entities to truth-values that receives its modifying endotypical function only by virtue of a separate modification rule. In order to assess this and related controversies empirically, research on modification pays particular attention to interface questions such as the following: how do structural conditions and the modifying function conspire in establishing complex interpretations? What roles do ontological information and fine-grained conceptual knowledge play in the course of concept combination?

Article

Computational Semantics  

Katrin Erk

Computational semantics performs automatic meaning analysis of natural language. Research in computational semantics designs meaning representations and develops mechanisms for automatically assigning those representations and reasoning over them. Computational semantics is not a single monolithic task but consists of many subtasks, including word sense disambiguation, multi-word expression analysis, semantic role labeling, the construction of sentence semantic structure, coreference resolution, and the automatic induction of semantic information from data. The development of manually constructed resources has been vastly important in driving the field forward. Examples include WordNet, PropBank, FrameNet, VerbNet, and TimeBank. These resources specify the linguistic structures to be targeted in automatic analysis, and they provide high-quality human-generated data that can be used to train machine learning systems. Supervised machine learning based on manually constructed resources is a widely used technique. A second core strand has been the induction of lexical knowledge from text data. For example, words can be represented through the contexts in which they appear (called distributional vectors or embeddings), such that semantically similar words have similar representations. Or semantic relations between words can be inferred from patterns of words that link them. Wide-coverage semantic analysis always needs more data, both lexical knowledge and world knowledge, and automatic induction at least alleviates the problem. Compositionality is a third core theme: the systematic construction of structural meaning representations of larger expressions from the meaning representations of their parts. The representations typically use logics of varying expressivity, which makes them well suited to performing automatic inferences with theorem provers. Manual specification and automatic acquisition of knowledge are closely intertwined. Manually created resources are automatically extended or merged. The automatic induction of semantic information is guided and constrained by manually specified information, which is much more reliable. And for restricted domains, the construction of logical representations is learned from data. It is at the intersection of manual specification and machine learning that some of the current larger questions of computational semantics are located. For instance, should we build general-purpose semantic representations, or is lexical knowledge simply too domain-specific, and would we be better off learning task-specific representations every time? When performing inference, is it more beneficial to have the solid ground of a human-generated ontology, or is it better to reason directly with text snippets for more fine-grained and gradual inference? Do we obtain a better and deeper semantic analysis as we use better and deeper manually specified linguistic knowledge, or is the future in powerful learning paradigms that learn to carry out an entire task from natural language input and output alone, without pre-specified linguistic knowledge?

Article

Planetary Atmospheres: Chemistry and Composition  

Channon Visscher

The observed composition of a planetary atmosphere is the product of planetary formation and evolution, including the chemical and physical processes shaping atmospheric abundances into the present day. In the solar system, the gas giant planets Jupiter, Saturn, Uranus, and Neptune possess massive molecular envelopes consisting mostly of H2 and He along with various minor amounts of heavy elements such as C, N, and O (present as CH4, NH3, and H2O, respectively) and numerous additional minor species. The terrestrial planets Venus, Earth, and Mars each possess a relatively thin atmospheric envelope surrounding a rocky surface. The atmospheres of Mars and Venus are characterized by abundant CO2 with a small amount of N2, whereas the atmosphere of the Earth is dominated by N2 and O2. Such differences provide clues to the divergent pathways of atmospheric evolution. Numerous closely coupled physical and chemical processes give rise to the abundances observed in the planetary atmospheres of the solar system. These processes include the maintenance of thermochemical equilibrium, reaction kinetics, atmospheric transport, photochemistry, condensation (including cloud formation) and vaporization, deposition and sublimation, diurnal and seasonal effects, greenhouse effects, surface–atmosphere reactions, volcanic activity, and (in the case of Earth) biogenic and anthropogenic sources. The present understanding of the chemical composition of planetary atmospheres is the result of over a century of observations, including ground-based, space-based, and in situ measurements of the major, minor, trace, and isotopic species found on each planet. These observations have been accompanied by experimental studies of planetary materials and the development of theoretical models to identify the key processes shaping atmospheric abundances observed today.

Article

Iterative Meaning in Mandarin Chinese: Linguistic Factors and its Processing  

Huei-ling Lai and Yao-Ying Lai

Sentential meaning that emerges compositionally is not always transparent as one-to-one mapping from syntactic structure to semantic representation; oftentimes, the meaning is underspecified (morphosyntactically unsupported), not explicitly conveyed via overt linguistic devices. Compositional meaning is obtained during comprehension. The associated issues are explored by examining linguistic factors that modulate the construal of underspecified iterative meaning in Mandarin Chinese (MC). In this case, the factors include lexical aspect of verbs, the interval-lengths denoted by post-verbal durative adverbials, and boundary specificity denoted by preverbal versus post-verbal temporal adverbials. The composition of a punctual verb (e.g., jump, poke) with a durative temporal adverbial like Zhangsan tiao-le shi fenzhong. Zhangsan jump-LE ten minute ‘Zhangsan jumped for ten minutes’ engenders an iterative meaning, which is morphosyntactically absent yet fully understood by comprehenders. Contrastively, the counterpart involving a durative verb (e.g., run, swim) like Zhangsan pao-le shi fenzhong Zhangsan run-LE ten minute ‘Zhangsan ran for ten minutes’ engenders a continuous reading with identical syntactic structure. Psycholinguistically, processing such underspecified meaning in real time has been shown to require greater effort than the transparent counterpart. This phenomenon has been attested cross-linguistically; yet how it is manifested in MC, a tenseless language, remains understudied. In addition, durative temporal adverbials like yizhi/buduandi ‘continuously,’ which appear preverbally in MC, also engender an iterative meaning when composed with a punctual verb like Zhangsan yizhi/buduandi tiao. Zhangsan continuously jump ‘Zhangsan jumped continuously.’ Crucially, unlike the post-verbal adverbials that encode specific boundaries for the denoted intervals, these preverbal adverbials refer to continuous time spans without specific endpoints. The difference in boundary specificity between the two adverbial types, while both being durative, is hypothesized to modulate the processing profiles of aspectual comprehension. Results of the online (timed) questionnaire showed (a) an effect of boundary specificity: sentences with post-verbal adverbials that encode [+specific boundary] were rated lower in the naturalness-rating task and induced longer response time (RT) in iterativity judgements, as compared to preverbal adverbials that encode [−specific boundary]; (b) in composition with post-verbal adverbials that are [+specific boundary], sentences involving durative verbs elicited lower rating scores and longer RT of iterativity judgements than the counterpart involving punctual verbs. These suggest that the comprehension of underspecified iterative meaning is modulated by both cross-linguistically similar parameters and language-specific systems of temporal reference, by which MC exhibits a typological difference in processing profiles. Overall, the patterns are consistent with the Context-Dependence approach to semantic underspecification: comprehenders compute the ultimate reading (iterative versus continuous) by taking both the sentential and extra-sentential information into consideration in a given context.