Livres sur le sujet « Interval Sequences »

The diagnosis of first-degree and third-degree atrioventricular (AV) block is straightforward but that of second-degree AV block is more involved. Type I block and type II second-degree AV block are electrocardiographic patterns that refer to the behaviour of the PR intervals (in sinus rhythm) in sequences (with at least two consecutive conducted PR intervals) where a single P wave fails to conduct to the ventricles. Type I second-degree AV block describes visible, differing, and generally decremental AV conduction. Type II second-degree AV block describes what appears to be an all-or-none conduction without visible changes in the AV conduction time before and after the blocked impulse. The diagnosis of type II block requires a stable sinus rate, an important criterion because a vagal surge (generally benign) can cause simultaneous sinus slowing and AV nodal block, which can resemble type II block. The diagnosis of type II block cannot be established if the first post-block P wave is followed by a shortened PR interval or by an undiscernible P wave. A narrow QRS type I block is almost always AV nodal, whereas a type I block with bundle branch block barring acute myocardial infarction is infranodal in 60–70% of cases. All correctly defined type II blocks are infranodal. A 2:1 AV block cannot be classified in terms of type I or type II block, but it can be AV nodal or infranodal. Concealed His bundle or ventricular extrasystoles may mimic both type I or type II block (pseudo-AV block), or both

This chapter introduces the Main Lemma that implies the existence of continuous solutions. According to this lemma, there exist constants K and C such that the following holds: Let ϵ‎ > 0, and suppose that (v, p, R) are uniformly continuous solutions to the Euler-Reynolds equations on ℝ x ³, with v uniformly bounded⁷ and suppR ⊆ I x ³ for some time interval. The Main Lemma implies the following theorem: There exist continuous solutions (v, p) to the Euler equations that are nontrivial and have compact support in time. To establish this theorem, one repeatedly applies the Main Lemma to produce a sequence of solutions to the Euler-Reynolds equations. To make sure the solutions constructed in this way are nontrivial and compactly supported, the lemma is applied with e(t) chosen to be any sequence of non-negative functions whose supports are all contained in some finite time interval.

This chapter makes a case for morphemes as zones of functional sequence (fseq zones) in nanosyntax. Under such an approach, morphemes that compete for insertion with each other form the same fseq zone, whereas morphemes that co-occur together form different fseq zones. We illustrate this on the basis of the participle zone that is projected on top of verb stems in Slavic languages. We argue that in Polish and Czech, this participle zone spells out as L, T, or N, depending on its size and internal constituent structure. The constituent structure of this zone provides a direct solution to a long-standing puzzle in Polish and Czech morphology, namely why only unaccusative verbs build adjectival L-passives whereas all types of verbs build active L-participles.

The faculty to generate patterns is a basic feature of living systems. This chapter concentrates on patterns used in the context of control of behavior. Spatio-temporal patterns appear as quasi-rhythmic patterns mainly in the domain of locomotion (e.g. swimming, flying, walking). Such patterns may be rooted directly in the nervous system itself, or may emerge in interaction with the environment. The examples given show simulation of the corresponding behaviors that in most cases are applied to robots (e.g. walking in an unpredictable environment). In addition, non-rhythmic patterns will be explained which are linked to internal states and are required to select specific behaviors and control behavioral sequences. Such states may be relevant for top-down attention and may or may not be accompanied with subjective experiences, then called mind patterns. Specific cases concern the application of an internal body model, as well as states characterized as cognitive or as conscious.

The Beaufort Formation records extraordinary details of Arctic environments and amplified temperatures at approximately modern levels of atmospheric CO2. It was deposited during the Neogene on the western side of what is now the Canadian Arctic Archipelago. Meighen Island is a key locality for studying this formation because marine sediments there are interbedded with terrestrial fossiliferous sands. The biostratigraphic succession, fossils from the marine beds, and paleomagnetic data from the Bjaere Bay region of the island suggest two potential ages for the studied exposures: either continuous deposition at ca. 3.0 Ma, or a sequence of deposits at ca. 4.5 Ma and 3.4 Ma. The sediments appear to encompass at least two eustatic highstands of sea level and a particularly warm climate interval of the Pliocene Arctic.

In this chapter I continue the voyage into info-metrics in action, with an emphasis on more advanced info-metric inference in real-world environments. I develop a sequence of increasingly complex applications. In the first example, the maximum entropy method is extended for inferring interval information, with an application to weather data. The next example introduces additional conditional information into the constraints. It is a laboratory example, complemented with simulated data matched to observed population frequencies. The last example is the most complex, using surprisal analysis and Bayes’s rule to infer conditional probabilities from brain tumor data. In each problem the quantities whose entropy is maximized are identified and motivated. These examples demonstrate the power and generality of the info-metrics framework by showing that it allows inference in a variety of realistic settings.

Design and Analysis of Time Series Experiments develops a comprehensive set of models and methods for drawing causal inferences from time series. Example analyses of social, behavioral, and biomedical time series illustrate a general strategy for building AutoRegressive Integrated Moving Average (ARIMA) impact models. The classic Box-Jenkins-Tiao model-building strategy is supplemented with recent auxiliary tests for transformation, differencing, and model selection. The validity of causal inferences is approached from two complementary directions. The four-validity system of Cook and Campbell relies on ruling out discrete threats to statistical conclusion, internal, construct, and external validity. The Rubin system causal model relies on the identification of counterfactual time series. The two approaches to causal validity are shown to be complementary and are illustrated with a construction of a synthetic control time series. Example analyses make optimal use of graphical illustrations. Mathematical methods used in the example analyses are explicated in technical appendices, including expectation algebra, sequences and series, maximum likelihood, Box-Cox transformation analyses and probability.

By offering the first in-depth introduction to the framework of nanosyntax, Exploring Nanosyntax fills a major gap in the current theoretical literature. Originating within the generative Principles and Parameters tradition in the study of language, nanosyntax was developed starting in the early 2000s by Michal Starke. Deploying a radical implementation of the cartographic “one feature–one head” maxim, the framework aims at a fine-grained decomposition of morphosyntactic structure, thus laying bare the building blocks of the universal functional sequence. This volume aims at making three contributions. First, it presents the framework’s constitutive tools and principles and explains how nanosyntax relates to cartography and to Distributed Morphology. Second, the volume illustrates how nanosyntactic tools and principles can be applied within a range of empirical domains of natural language. In doing so, the volume provides a range of detailed and crosslinguistic investigations that uncover novel empirical data and that contribute to a better understanding of the functional sequence. Finally, new theoretical strands internal to the nanosyntactic framework are explored, with specific problems raised and discussed. The volume contains original contributions by senior and junior researchers in the field and constitutes an ideal handbook for advanced students and researchers in linguistics. Above all, Exploring Nanosyntax offers the first encompassing view of this promising framework, making its methodology and exciting results accessible to a wide audience.

Interspecific fish reproductive patterns, outputs and life cycles display the greatest variability within the vertebrates. Early stages of oogenesis can be repeated in adult fish, contrasting with mammals; the pre-set sequence of cell divisions in gametogenesis is otherwise similar and is described in detail. Most fish deposit much yolk (vitellogenesis) in developing eggs. Migrations, beach-spawning and mouth-brooding are some of the interesting variations. Fertilization is predominantly external but is internal in some groups such as chondrichthyans. The omission of annual reproduction is well established in some freshwater species and the idea that this may also be the case for marine teleosts is gaining acceptance. This should be taken into account for intensively fished species. The possible roles of external cues, hormones, pheromones and neural factors acting as ‘switches’ and coordinators in gametogenesis and reproductive behaviour are discussed.

James Tenney reflects on form in twentieth-century music, first by offering an alternative to the conventional definition of form and introducing a number of new terms. He then considers three factors that determine form: shape, structure, and state. In relation to these factors, he describes three aspects of form to consider at each hierarchical level: the structural (internal relations), the morphological (shape), and the statistical (state, condition). These relations between state, shape, and structure at adjacent hierarchical levels are relevant to the old problem of “form versus content.” Tenney also emphasizes the importance of perception in the matter of form and proceeds with a discussion of new formal conditions in twentieth-century music at each of the three hierarchical levels he mentioned earlier in relation to sound elements, the clang, and the sequence. Finally, he explores higher levels of organization and perception with regards to shape and structure.

Transoesophageal echocardiography (TOE), a minimal-risk, semi-invasive imaging procedure is nowadays an indispensable part of routine echocardiography. It is mainly necessary and indicated: ◆ To analyse some structures insufficiently seen transthoracically, such as the left atrial appendage or the thoracic aorta. ◆ In situations that prohibit the use of conventional transthoracic windows, such as the patient undergoing cardiac surgery.As in transthoracic echocardiography (TTE), the TOE examination consists of a sequence of views defined by internal landmarks; unlike TTE, depending on the patient’s tolerance and the clinical question, not all of these have to be obtained in every examination. Important typical indications for TOE are the search for signs of endocarditis, the search for cardiogenic emboli, diagnosis of left atrial (appendage) thrombi before cardioversion, diagnosis of aortic dissection, characterization of mitral and aortic valve pathology especially in the context of surgical repair, intraoperative monitoring of left ventricular function, and monitoring of interventional cardiac procedures monitored.For some indications, intracardiac echocardiography has been found useful. This procedure involves insertion of a transducer-tipped catheter into the caval vein and advancement to the right heart, or intra-aortic placement. Applications are electrophysiological procedures, interventional closure of atrial septal defect, aortic stent placement, and others.

The main milestones of the formation and development of astronomical science in Kharkiv during 1883–1945 are reconstructed on the example of the activities of the astronomical observatory of Kharkiv University. During this period, the outstanding worldview science in Kharkiv has achieved significant success: the works of Kharkiv astronomers have received world recognition; a well-known scientific planetary school has been established at the Observatory; the scientific community highly appreciated the research on the physics and chemistry of the Moon, the giant and small planets of the Solar System. The primary goal of the research is to inscribe the history of the university Observatory into the European and world context. Its purpose is to summarize the results of a comprehensive historical ad scientific study of the development of astronomical research in Kharkiv at the end of the 19th century – the first half of the 20th century and identification of ways of further scientific research. The completed research, which continues the problems of works devoted to the study of the history of astronomical science in Ukraine, focuses on expanding the well-known source base by attracting new retro-information resources. In particular, the monograph used a significant array of archival primary sources from almost twenty archival and library institutions of different countries. Most of them were introduced into scientific circulation for the first time, which allowed to determine and specify the sequence of stages of development of astronomical science in Kharkiv during the research period, to clarify and identify the little-known circumstances of the observatory life. The methodological basis of the study is the principles of historism, objectivity and a systematic approach to studying the problem. To solve specific problematic tasks in the monograph, general scientific and specially historical methods were used which allowed to study, analyze and summarize the presented factual material in a complex manner. The main sections of the monograph represent the dynamics of replenishment of the instrumental base of the university observatory, the chronology of the construction of the observatory complex of buildings at the location of the modern Scientific Research Institute of Astronomy of the V. N. Karazin Kharkiv National University. According to the author’s periodization, the stages of formation of subjects and directions of scientific work of university astronomers have been analyzed, including: seismic observations with the help of horizontal Rebeur-Paschwitz pendulums, research of the activity of the Sun, astrometric observations on the Repsold meridian circle of for the purpose of compiling a catalog of zodiac stars, studying lunar eclipses and meteor showers. The participation of university astronomers in the creation of the plan of the city of Kharkiv and its connection with the general network of precise geometric leveling of the Military Topographic Department of the General Staff; the organization of observations by an expedition of Kharkiv astronomers of the total Solar eclipse of 1914 in Henichesk; the creation of the School-workshop of precision mechanics at the Faculty of Physics and Mathematics of Kharkiv University were considered; information on the participation of Kharkiv astronomers in the events of the civil war during the Ukrainian Revolution was documented. The scientific research activity of Kharkiv astronomers during 1920-1930-s which was devoted to carrying out important astrometric works on meridian observations of star declinations by absolute methods and observations of Kopf-Rentz stars according to the programs of the International Astronomical Union; the initiation of the creation of the Catalog of faint stars; research in astrophysics aimed at studying the physical conditions on the Moon and the Sun, planets and the interstellar environment; performing long series of spectrophotometric observations of the Moon, Jupiter, Mars and Saturn under different conditions of observation; study of the kinematics of stellar systems of different order, the physical parameters and evolution of stars, the morphology of the Galaxy, the nature of the stellar subsurfaces and atmospheres, dust and gas nebulae, new stars and the variability of stars have been considered; the directions of solid works carried out in the field of celestial mechanics, devoted to the dynamics of the minor planets of the Jupiter group, the definition and improvement of the orbits of minor planets have been clarified. The development of amateur astronomy in Kharkiv, in particular, the functioning of circles and societies that directed their activities to the dissemination of astronomical knowledge, was highlighted; the participation of their representatives in astronomical observations at the Kharkiv Astronomical Observatory was emphasized. Reconstructed the development of historical events in the 1930s related to the involvement of Soviet and Western astronomers in the processes of political confrontation between the USSR and the Western world; investigated the course of circumstances that prevented the implementation of the project of creating a new modern astronomical center of national importance – the central Ukrainian observatory in Kharkiv; the participation of an expedition of Kharkiv astronomers in the observation of the «great Soviet eclipse» – the total solar eclipse of 1936 – in the North Caucasus is highlighted; established the facts of political «purges» and repressions by the People’s Commissariat for Internal Affairs ( the NKVD) in the Kharkiv Astronomical Observatory. The activity of the Kharkiv Astronomical Observatory has been documented and authentic biographical information about its representatives during the Nazi occupation of 1941–1943, the period of the German-Soviet war, has been presented; the unpopular facts of the forced collaboration of some scientists are highlighted; the process of recovery and reconstruction of the Kharkiv Astronomical Observatory after the liberation of the city is characterized. With the aim of researching the personal history of Kharkiv astronomy of the studied period, the monograph presents the results of a historical and biographical study of facts of life and scientific heritage of scientists who fully devoted themselves to Science, laid the foundations for the future development of many directions of modern astronomical research, made a significant contribution to the treasury of the national and European astronomical science, whose activities were connected with the Kharkiv Astronomical Observatory, in particular: Grigory Levytsky, Ludwig Struve, Mykola Evdokymov, Otto Struve, Mykola Barabashov, Boris Gerasimovich, Vasil Fesenkov, Oleksiy Razdolsky, Boris Ostashchenko-Kudryavtsev, Nicholas Bobrovnikov, Paraskovia Parkhomenko, Mstislav Savron, Boris Semeykin, Kostyantyn Savchenko and others (25 biographical essays are presented). A significant part of the mentioned factual material was also introduced into scientific circulation for the first time. A separate section of the monograph provides chronologically structured information that reflects the sequence of research work of the Kharkiv Astronomical Observatory employees during the period under study: from astrometric observations of stars and seismic research to spectrohelioscopic and spectroheliographic observations of the Sun and the initiation of the Kharkiv school of planetary science. It is assumed that the materials of the monograph will be used in research work devoted to the study of the process of institutionalization of astronomical research in Kharkiv at the end of the 19th century – the first half of the 20th century.