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Добірка наукової літератури з теми "TA SYSTEMS"

Автор: Grafiati

Опубліковано: 11 вересня 2023

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Статті в журналах з теми "TA SYSTEMS"

OuYang, Xuemei, Fucheng Yin, Jingxian Hu, Ye Liu, and Zhaohui Long. "Thermodynamic Modeling of B-Ta and B-C-Ta Systems." Journal of Phase Equilibria and Diffusion 38, no. 6 (November 3, 2017): 874–86. http://dx.doi.org/10.1007/s11669-017-0603-2.

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Li, Meng, Nannan Guo, Gaoyu Song, Yi Huang, Lecheng Wang, Yani Zhang, and Tietao Wang. "Type II Toxin–Antitoxin Systems in Pseudomonas aeruginosa." Toxins 15, no. 2 (February 17, 2023): 164. http://dx.doi.org/10.3390/toxins15020164.

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Анотація:

Toxin–antitoxin (TA) systems are typically composed of a stable toxin and a labile antitoxin; the latter counteracts the toxicity of the former under suitable conditions. TA systems are classified into eight types based on the nature and molecular modes of action of the antitoxin component so far. The 10 pairs of TA systems discovered and experimentally characterised in Pseudomonas aeruginosa are type II TA systems. Type II TA systems have various physiological functions, such as virulence and biofilm formation, protection host against antibiotics, persistence, plasmid maintenance, and prophage production. Here, we review the type II TA systems of P. aeruginosa, focusing on their biological functions and regulatory mechanisms, providing potential applications for the novel drug design.

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Massey, Robert F. "TA as a Family Systems Therapy." Transactional Analysis Journal 15, no. 2 (April 1985): 120–41. http://dx.doi.org/10.1177/036215378501500203.

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Habib, Gul, Qing Zhu, and Baolin Sun. "Bioinformatics and Functional Assessment of Toxin-Antitoxin Systems in Staphylococcus aureus." Toxins 10, no. 11 (November 14, 2018): 473. http://dx.doi.org/10.3390/toxins10110473.

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Staphylococcus aureus is a nosocomial pathogen that can cause chronic to persistent infections. Among different mediators of pathogenesis, toxin-antitoxin (TA) systems are emerging as the most prominent. These systems are frequently studied in Escherichia coli and Mycobacterial species but rarely explored in S. aureus. In the present study, we thoroughly analyzed the S. aureus genome and screened all possible TA systems using the Rasta bacteria and toxin-antitoxin database. We further searched E. coli and Mycobacterial TA homologs and selected 67 TA loci as putative TA systems in S. aureus. The host inhibition of growth (HigBA) TA family was predominantly detected in S. aureus. In addition, we detected seven pathogenicity islands in the S. aureus genome that are enriched with virulence genes and contain 26 out of 67 TA systems. We ectopically expressed multiple TA genes in E. coli and S. aureus that exhibited bacteriostatic and bactericidal effects on cell growth. The type I Fst toxin created holes in the cell wall while the TxpA toxin reduced cell size and induced cell wall septation. Besides, we identified a new TA system whose antitoxin functions as a transcriptional autoregulator while the toxin functions as an inhibitor of autoregulation. Altogether, this study provides a plethora of new as well as previously known TA systems that will revitalize the research on S. aureus TA systems.

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Xu, Jiali, Nian Zhang, Manman Cao, Sujing Ren, Ting Zeng, Minglu Qin, Xigong Zhao, Fangyan Yuan, Huanchun Chen, and Weicheng Bei. "Identification of Three Type II Toxin-Antitoxin Systems in Streptococcus suis Serotype 2." Toxins 10, no. 11 (November 13, 2018): 467. http://dx.doi.org/10.3390/toxins10110467.

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Анотація:

Type II toxin-antitoxin (TA) systems are highly prevalent in bacterial genomes and have been extensively studied. These modules involve in the formation of persistence cells, the biofilm formation, and stress resistance, which might play key roles in pathogen virulence. SezAT and yefM-yoeB TA modules in Streptococcus suis serotype 2 (S. suis 2) have been studied, although the other TA systems have not been identified. In this study, we investigated nine putative type II TA systems in the genome of S. suis 2 strain SC84 by bioinformatics analysis and identified three of them (two relBE loci and one parDE locus) that function as typical type II TA systems. Interestingly, we found that the introduction of the two RelBE TA systems into Escherichia coli or the induction of the ParE toxin led to cell filamentation. Promoter activity assays indicated that RelB1, RelB2, ParD, and ParDE negatively autoregulated the transcriptions of their respective TA operons, while RelBE2 positively autoregulated its TA operon transcription. Collectively, we identified three TA systems in S. suis 2, and our findings have laid an important foundation for further functional studies on these TA systems.

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Brantl, Sabine, and Peter Müller. "Toxin–Antitoxin Systems in Bacillus subtilis." Toxins 11, no. 5 (May 9, 2019): 262. http://dx.doi.org/10.3390/toxins11050262.

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Анотація:

Toxin–antitoxin (TA) systems were originally discovered as plasmid maintenance systems in a multitude of free-living bacteria, but were afterwards found to also be widespread in bacterial chromosomes. TA loci comprise two genes, one coding for a stable toxin whose overexpression kills the cell or causes growth stasis, and the other coding for an unstable antitoxin that counteracts toxin action. Of the currently known six types of TA systems, in Bacillus subtilis, so far only type I and type II TA systems were found, all encoded on the chromosome. Here, we review our present knowledge of these systems, the mechanisms of antitoxin and toxin action, and the regulation of their expression, and we discuss their evolution and possible physiological role.

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Kamruzzaman, Muhammad, Alma Y. Wu, and Jonathan R. Iredell. "Biological Functions of Type II Toxin-Antitoxin Systems in Bacteria." Microorganisms 9, no. 6 (June 11, 2021): 1276. http://dx.doi.org/10.3390/microorganisms9061276.

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Анотація:

After the first discovery in the 1980s in F-plasmids as a plasmid maintenance system, a myriad of toxin-antitoxin (TA) systems has been identified in bacterial chromosomes and mobile genetic elements (MGEs), including plasmids and bacteriophages. TA systems are small genetic modules that encode a toxin and its antidote and can be divided into seven types based on the nature of the antitoxin molecules and their mechanism of action to neutralise toxins. Among them, type II TA systems are widely distributed in chromosomes and plasmids and the best studied so far. Maintaining genetic material may be the major function of type II TA systems associated with MGEs, but the chromosomal TA systems contribute largely to functions associated with bacterial physiology, including the management of different stresses, virulence and pathogenesis. Due to growing interest in TA research, extensive work has been conducted in recent decades to better understand the physiological roles of these chromosomally encoded modules. However, there are still controversies about some of the functions associated with different TA systems. This review will discuss the most current findings and the bona fide functions of bacterial type II TA systems.

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Zhang, Enkuan, Xinpei Xu, Yun Chen, and Ying Tang. "Third-Generation Thermodynamic Descriptions for Ta-Cr and Ta-V Binary Systems." Materials 15, no. 6 (March 11, 2022): 2074. http://dx.doi.org/10.3390/ma15062074.

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The third-generation thermodynamic descriptions for Ta-Cr and Ta-V binary systems were performed to construct the reliable thermodynamic database for refractory high-entropy alloys (RHEAs) containing Laves phase. The third-generation Gibbs energy expressions of pure Cr and V in both solid and liquid phases were established, from which the thermodynamic properties and thermal vacancy can be well described. The thermodynamic descriptions of Ta-Cr and Ta-V over the whole composition and temperature regions were carried out based on the reviewed phase equilibria and thermodynamic data with the CALPHAD (CALculation of PHAse Diagrams) approach. Specifically, the thermodynamic parameters of C14 and C15 Laves phases were evaluated by combining the theoretically computed and experimentally measured thermodynamic properties as well as the semiempirical relations. The calculated phase diagrams and thermodynamic properties in Ta-Cr and Ta-V systems according to the present thermodynamic parameters had a nice agreement with the experimental data even down to 0 K, indicating the reliability of the present modeling.

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Rafaja, D., W. Lengauer, and H. Wiesenberger. "Non-metal diffusion coefficients for the Ta–C and Ta–N systems." Acta Materialia 46, no. 10 (June 1998): 3477–83. http://dx.doi.org/10.1016/s1359-6454(98)00036-6.

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Levante, Alessia, Camilla Lazzi, Giannis Vatsellas, Dimitris Chatzopoulos, Vasilis S. Dionellis, Periklis Makrythanasis, Erasmo Neviani, and Claudia Folli. "Genome Sequencing of five Lacticaseibacillus Strains and Analysis of Type I and II Toxin-Antitoxin System Distribution." Microorganisms 9, no. 3 (March 21, 2021): 648. http://dx.doi.org/10.3390/microorganisms9030648.

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Анотація:

The analysis of bacterial genomes is a potent tool to investigate the distribution of specific traits related to the ability of surviving in particular environments. Among the traits associated with the adaptation to hostile conditions, toxin–antitoxin (TA) systems have recently gained attention in lactic acid bacteria. In this work, genome sequences of Lacticaseibacillus strains of dairy origin were compared, focusing on the distribution of type I TA systems homologous to Lpt/RNAII and of the most common type II TA systems. A high number of TA systems have been identified spread in all the analyzed strains, with type I TA systems mainly located on plasmid DNA. The type II TA systems identified in these strains highlight the diversity of encoded toxins and antitoxins and their organization. This study opens future perspectives on the use of genomic data as a resource for the study of TA systems distribution and prevalence in microorganisms of industrial relevance.

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Дисертації з теми "TA SYSTEMS"

Morton, Jeremy Andrew. "Advancement of Online Systems in Engineering by Expert TA." NCSU, 2006. http://www.lib.ncsu.edu/theses/available/etd-05182006-121854/.

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Анотація:

This dissertation introduces a new online system called Expert TA. The system was developed based on the hypothesis that expressions are key elements in engineering problems and that the treatment of expressions is critical to the advancement of online systems. This dissertation identifies ergonomic problems with expression entry that Expert TA overcomes through the use of a problem-customize integrated expression editor, called a palate. Then the dissertation shows, using an expression analyzer that operates in the background of Expert TA, that specific mathematical mistakes within an entered expression can now be located. Emulating standard instructional practices, detailed feedback pertaining to specific mistakes and grading on the basis of specific mistakes is now possible.

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SHARMA, KRITIKA. "TO DECIPHERTHE ROLE OF TA SYSTEMS IN MYCOBACTERIUM TUBERCULOSIS." Thesis, DELHI TECHNOLOGICAL UNIVERSITY, 2021. http://dspace.dtu.ac.in:8080/jspui/handle/repository/18461.

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Анотація:

Mycobacterium tuberculosis is the bacteria responsible for the disease of the infamous Tuberculosis (TB). mtb is the major human pathogens prevalent in developing countries, with an appropriate number of 2 million deaths per year. This disease is treatable but the hurdles we face, this project helps in giving the new approach and better perspective. Latent Tb is the phase when the bacteria exits in one person’s body and unable to replicate properly due to healthy and good immunity response. But it shows its pathogenicity when the immune response gets degraded. The reason can be any other physiological condition or aging. Even after any person is responding regardless having any physiological conditions, the case of patient can be treated. But problem arises when patient’s body stop responding regarding the treatment. To overcome the growing problem of MDR, XDR varieties and eradication of the latent form of TB, novel ways of more rapid treatment are the need of the hour. The complete sequence of the genome of Mtb (H37Rv) has been achieved, but more deep knowledge and understanding of different classes of toxin and antitoxin systems needs to be studies. Mycobacterium tuberculosis is known to be the causative agent in tuberculosis. Tuberculosis is the disease in which lungs get affected along with other parts. 87% new cases had been recorded in TB burden countries. Among which out of 30 countries, 8 countries hold the two thirds of the cases. India was among the 8 countries. More than 2 million cases were recoded in past two years. And this data is keep increasing in recent years. Immunology plays a paramount role in this disease. The person who gets affected by the mtb infection is expected to express inflammatory response which causes the breakdown of the lungs matrix and formation of lung cavities. But many underlying immunological dysfunction like aids and diabetes etc. creates variation in formation of lung cavities. The fatality in TB is increased by the drug resistant TB. It means that the person stops responding to the treatment. Over the past decade, there has been a sharp increase in the disease, with the emergence of MDR and EDR varieties of TB. Toxin-Antitoxin systems are potential therapeutic domain in antibiotic resistance. TA systems are present in the bacteria. These TA systems can be classified into six classes. They are prone to the unfavorable conditions. We can manipulate these TA regions to loosen up its harmful effect and will make it less fatal in the cause of tuberculosis.

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Lo, Hong Rui. "System characterisation and identification of non-linear systems (with particular reference to hysteretic systems)." Thesis, University of Southampton, 1988. https://eprints.soton.ac.uk/52277/.

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System identification is the process of building mathematical models of dynamical systems based on observed data. Many effective techniques have been developed for linear systems. For non-linear systems, some progress has been achieved, but techniques for practical use and which can deal with a large class of systems are limited. In particular few identification techniques have been found in the literature which can be applied to hysteretic systems. This thesis is devoted to the development of a system identification technique which can be applied to a relatively large class of non-linear systems, including hysteretic systems. The key to this technique is to select an appropriate subset of the state vector describing the system and generate a non-linear surface in this subspace which characterises the non-linearity. For non-hysteretic systems, this space is the normal state space. For hysteretic systems, the selection of the appropriate space usually needs some prior knowledge about the system. The procedure involves estimating the non-linear component as a function of time. This is approached via a deconvolution method, and a section of this thesis shows how an optimal deconvolution method may be used. The method of creating the surface is described, and identification is then conducted by analysing and fitting the surface. The success of identification is obviously affected by the quality of the surface, which is, in turn, affected by factors such as the type and the level of the excitation, the frequency range and the magnitude of the spectrum of the process, and errors in the signal processing. These problems are discussed in the application of this technique to several simulated non-linear systems (including both non-hysteretic and hysteretic types) and also to the practical case of a cable type vibration isolator.

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Vafiadis, Konstantinos G. "Systems and control problems in early systems design." Thesis, City University London, 2003. http://openaccess.city.ac.uk/7661/.

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This thesis is concerned with the evaluation of properties of early design models, the control structure selection and the representation and properties of composite system models. The work is motivated by the need to introduce a Systems and Control Theory based framework for early design stages of the overall system design of engineering processes, and in particular chemical processes, such as process synthesis and control structure selection. The overall spirit of the work is that engineering design is an evolutionary process, the different stages of which shape the structure of the resulting system models and precondition the potential for design at the next stage. The work identifies a number of key problems in the overall design, which are of a generic, systemic character, and then deals with working out solutions for such problems. The results contribute in the development of a framework for systems integration using as criteria and tools, those provided by Systems and Control Theory. The work aims to provide a control theoretic dimension to the rules and practices currently used in the specific application areas. The thesis contributes in the development of a Systems and Control conceptual and tools framework for integrated design of engineering processes by providing results in the following areas: - Specification of a number of generic problems in the field of integrated design and identification of relevant control theoretic concepts and tools. - Study of Model Orientation for linear implicit state-space models and definition of classes of oriented realisations. - Development of solutions to two problems of Structural Identification for uncertain early process models related to infinite zero structure and McMillan degree. - Development of a generic representation of composite systems that allows the study of transition from the aggregate to composite system properties, as a generalised Control Design and characterisation of some key system properties. -Specification of a framework for integrated Control Structure Selection and development of software for many approaches of the "interaction analysis" indicators. The results contribute in the area of development of the systems and control ideas for the problems of systems integration and early design. The work emphasises the strong links between Modelling, Selection of Control Structures and Control Structural methodologies.

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Hitchins, Derek K. "Conceiving systems." Thesis, City University London, 1990. http://openaccess.city.ac.uk/7668/.

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The thesis is concerned with the development of innovative, robust design concepts for a class of systems called Information Decision Action (IDA) Systems. IDA systems are typified by Command and Control (C2) and Command, Control, Communications and Intelligence (C3I) systems as used by police, emergency services and the military - the two titles refer respectively to the human activity and the technological systems. The class of systems is much wider, however, and includes, financial, traffic control, business and even governmental systems where information is gathered, used as a basis for human decision-forming, and results in action, all in real, or near-real time. IDA system complexity stems largely from the dominance of robust human activity systems within the overall system, and also from the employment of often-rigid, technology-based, decision support systems which are unable to adapt as swiftly as the humans they serve. The thesis is in two parts. In the first part, the author presents a perspective on "hard" and "soft" systems and the gradual move by so-called "hard" systems engineers towards softer concepts in the search for more satisfactory IDA systems. This progression is presented partly by anecdote, supported by some of the author's papers showing the development of his contribution to understanding of, and partly by an exposition of the essential themes inherent in, IDA systems. Keynote papers in the first part are: MOSAIC: Concepts for the Deployment of Air Power in Europe and The Human Element in C3 I: The first of these presents a highly-survivable alternative to the present force and C2 deployment approaches which have evolved little since World War IT; the second considers the human and his social behaviour as keys to understanding IDA systems. Other papers develop the themes and show their application to systems in which the author has had major involvement The second part is concerned with the process of conceiving and creating IDA systems and it too draws on published papers as direct support for the thesis. Keynote papers here are A General Theory of Command and Control, a unique recent paper which proposes a set of design axioms for an idealized IDA system, the award-winning Managing Systems Creation which presents an engineering framework for Creating Systems, and SEAMS (Systems Engineering, Analysis and Management Support) which signals a major design initiative to develop engineering frameworks into company-wide IT environments. The second part also introduces a complete Conceiving System, called the Seven-Step Continuum (SSC), describes some prototype tools developed by the author to perform some of the tasks of design conception and - in Chapter 9, which is a paper within the thesis - shows results from using the SSC, its methods and tools, in practice. The second part closes with a look forward to the building of flexible future systems which can adapt to their environment.

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Whitmore, Guy Matthew. "Coordinate reference systems for high precision geodesy." Thesis, University of Nottingham, 1994. http://eprints.nottingham.ac.uk/29037/.

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The advent of the Global Positioning System (GPS) meant that, for the first time, the geodetic and geophysical community has a tool for measurements on a global, continental and national scale. Global GPS networks are already competing with VLBI and SLR for the measurement of inter-continental baselines and earth rotation parameters. The development of the 'high accuracy fiducial GPS technique', as described in this thesis, has produced results comparable with mobile VLBI and SLR systems, but in shorter observational periods and at lower costs. Combined with global GPS networks, which have the potential to provide time-tagged fiducial station coordinates at the observational epochs, coordinates can be determined in a global reference frame. The results in this thesis, from a fiducial GPS campaign to monitor the vertical land movement at tide gauge sites in the UK, demonstrate that millimetric precisions and accuracies can be obtained in all three components over baselines of hundreds of kilometers. The combination of GPS with existing 2-d classical triangulation networks for mapping, engineering surveying and navigation has caused many problems, since the GPS observations are 3-d and of a superior quality. In Europe these problems have been overcome by the establishment of a new high precision reference framework, EUREF, based on fiducial GPS carried out in 1989. This thesis also describes the determination of coordinates for the UK EUREF stations and their application for geodetic control in Great Britain.

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Butt, Aaron Trevor. "Identification and characterisation of toxin-antitoxin systems (TA) in Burkholderia pseudomallei." Thesis, University of Exeter, 2013. http://hdl.handle.net/10871/9303.

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The aim of this study was to identify and characterise type II toxin-antitoxin (TA) systems in Burkholderia pseudomallei, the causative agent of the human disease melioidosis. 8 putative TA systems were identified within the genome of B. pseudomallei K96243. 5 of these were located witihn genome islands. Of the candidate toxins, BPSL0175 (RelE1) or BPSS1060 (RelE2) caused growth to cease when expressed in Escherichia coli, whereas expression of BPSS0390 (HicA) or BPSS1584 (HipA) (in an E. coli ΔhipBA background) caused a reduction in the number of culturable bacteria. HicA also caused growth arrest in B. pseudomallei K96243 ΔhicAB. These toxin induced phenotypes were enhanced by an <3kDa extracellular factor that accumulated in the spent medium during growth. Expression of the cognate antitoxins could restore growth and culturability of cells. Expression of hicA in E. coli gave an increased number of persister cells in response to ciprofloxacin or ceftazidime. Site directed mutagenesis studies identified two key residues within the HicA toxin that were essential for both the reduced culturability and increased persistence phenotypes. Deletion of hicAB from B. pseudomallei K96243 did not affect persister cell or survival frequencies compared to the wild type following treatment with a variety of stress conditions. Deletion of the ΔhipBA locus from B. pseudomallei K96243 also had no affect on bacterial persistence or survival under the conditions tested.

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Lathi, Deepak. "Impulse measurements in earthing systems." Thesis, Cardiff University, 2012. http://orca.cf.ac.uk/44776/.

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Анотація:

The behaviour of earth electrodes at power frequency conditions is well known. Several studies are going on at present, to understand the behaviour of earthing systems at transient impulse and high frequency conditions. The study of impulse measurements in earthing systems was carried out during this project, to understand the soil electromagnetic behaviour towards high frequency and variable AC/DC/impulse current magnitudes. Several measurement techniques and instrumentation used for the measurement of the earthing systems were surveyed. The limitations and the advantages of each approach have been identified, and the range of application determined. Extensive experiments were performed on the practical earth electrodes at the Cardiff University test site at Llanrumney, and at the Dinorwig power station earthing facilities. These experiments have revealed that there is reduction of impedance of earth electrodes over the frequency range 20Hz to 120kHz. Moreover, a pronounced effect of DC current magnitude was observed on the earth resistance of the electrodes over the range of 1mA to 500mA. The numerical modelling of the test configurations did not show the reduction in earth impedance over the frequency range 20Hz to 120kHz. To understand the different trends shown by the experiments and simulation, and the effect of frequency and current magnitude, a geological literature survey was carried out. This survey revealed that when the soil water electrolyte solution is subjected to high frequency electrical currents, it exhibits conductivity dispersion phenomenon. Conductivity dispersion is a phenomenon where conductivity of the clay water electrolyte solution increases by about 30% over a frequency range 20Hz to 100kHz. The geological literature survey also revealed that the polarisation effect in the soil water electrolyte is responsible for the non-linear current effect. Moreover, during this project, a new technique of FFT from impulse, was proposed to measure the earth electrode impedance, over a frequency range which is an inherent component of the impulse signals. The FFT from impulse signals, showed a good agreement of the measured earth impedance of the earth electrodes, with the measured earth impedance using the variable frequency scan method. FFT from impulse technique has an advantage over the variable frequency scan method, from the point of view of the time required for the measurement and the simplicity of the test source, for the measurement of the earth electrode impedance. Such a technique, could have impact on the testing at high current magnitudes, where impulse generation is much easier. Finally, the future scope of work is presented to explore the measurement of earth electrode impedance above the frequency of 120kHz and current magnitudes above 5A.

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Soltanahmadi, Abbasali. "Dynamics of flexible riser systems." Thesis, City, University of London, 1988. http://openaccess.city.ac.uk/20155/.

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Анотація:

This thesis is concerned with the static and dynamic analyses and the model testing of deep sea flexible riser systems which are the key components associated with semi-submersible oil platforms. A numerical method based on explicit integration of Newton's second law is developed to predict the 3-dimensional dynamic behaviour of the riser due to the hydrodynamic loadings induced by wave and current motion. In this analysis the effects of waves and currents from separate directions, vessel movements, vortex-shedding and structural damping are included. The material damping for the riser is modelled by a single Kelvin system and the hydrodynamic loadings are assessed from the modified Morison equation. The effect of vortex-shedding on the riser is modelled by considering the interaction of drag-inertia and lift forces due to wave and current motion. The drag coefficient being modified ~ the vortex-shedding effects which are predicted by calculating the maximum response of the flexible riser in the lift force direction. The formfinding and static analysis of the riser when subject to structural self-weight and other static loadings is carried out by the method of Dynamic Relaxation using kinetic damping. The method is well suited to computer aided design procedures in which various shapes for the riser catenary have to be investigated together with the effects of boundary support conditions and alternative arrangements of mooring buoys. The theories described above are implemented into three computer programs. The first program deals with the formfinding of the riser and the second investigates the dynamic behaviour of the riser due to non-linear current and wave loadings. The third program is concerned with the static solution of the riser due to current loading. The latter is employed when the hydrodynamic force consists of current loading only and therefore the dynamic solution is not desired. The iterative use of the first and third programs allows potential designs to be quickly investigated. The results predicted by the numerical analyses are compared with those obtained from two series of model tests in wave flumes. The tests were scaled from prototype situations using Froud number criteria. The first set of tests used a small scale flexible chain model with negligible material damping and structural bending stiffness and no induced vortex shedding; the aim of these tests being only to validate the assessment of the hydrodynamic forces on the riser. '!he second set investigated the response of a larger scale model which induced vortex-shedding and in which the riser system had significant structural damping. The comparison of experimental and computed results showed close agreement. The developed computer programs were also validated numerically by comparing the predicted results with those obtained from the well known riser program "FLEXRISER".

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Bingley, R. M. "Electronic theodolite intersection systems." Thesis, University of Nottingham, 1990. http://eprints.nottingham.ac.uk/14248/.

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Анотація:

The development of electronic surveying instruments, such as electronic theodolites, and concurrent advances in computer technology, has revolutionised engineering surveying; one of the more recent examples being the introduction of Electronic Theodolite Intersection Systems (ETISs). An ETIS consists of two or more electronic theodolites and a computer, with peripheral hardware and suitable software. The theoretical principles on which they are based have been known for a long time, but intersection has seldom been used as a method of measurement. The main reasons for its re-evaluation were the introduction of one-second electronic theodolites and the ability to interface these on-line to a computer. The last decade has seen the development of several commercially available systems and probably even more in-house developed systems. Such systems are capable of performing real-time, non-contact, three-dimensional coordinate determination to a high accuracy, enabling their use in a wide variety of applications. This thesis details all aspects of ETISs. Initially, the theoretical principles on which the systems are based are developed. The components of a system are then detailed and a review of current commercially available systems and their applications is given. The thesis then concentrates on the development of an ETIS by the author and details its' application in both industrial measurement and deformation monitoring. Finally, the thesis concludes with a discussion on the factors affecting the accuracies attainable with ETISs.

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Книги з теми "TA SYSTEMS"

Trohanis, Pascal Louis. Design considerations for state TA systems. [Chapel Hill, NC]: National Early Childhood Technical Assistance System, 2001.

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Novyt͡sʹkyĭ, V. V. Dekompozyt͡sii͡a ta keruvanni͡a v liniĭnykh systemakh. Kyïv: In-t matematyky Nat͡sionalʹnoï akademiï nauk Ukraïny, 1995.

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Kolot, A. M. Oplata prat͡s︡i na pidpryi͡e︡mstvi--orhanizat͡s︡ii͡a︡ ta udoskonalenni͡a︡. Kyïv: Firma "Prat͡s︡i͡a︡", 1997.

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V, Durdynet︠s︡ʹ, Zaĭchuk V. O, Tat︠s︡iĭ V. I︠A︡, Ukraine. Verkhovna Rada. Aparat. Upravlinni︠a︡ komp'i︠u︡teryzovanykh system. та Akademii︠a︡ pravovykh nauk Ukraïny. Naukovo-doslidnyĭ t︠s︡entr pravovoï informatyky., ред. Systemna informatyzat︠s︡ii︠a︡ zakonotvorchoï ta pravookhoronnoï dii︠a︡lʹnosti. Kyïv: Navchalʹna knyha, 2005.

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Shidlovskiĭ, Anatoliĭ Korneevich. Enerhetychni systemy z elektroperedachamy ta vstavkamy postiĭnoho strumu. Kyïv: Nauk. dumka, 1992.

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Pohorilyĭ, S. D. Komp'i︠u︡terni merez︠h︡i: Aparatni zasoby ta protokoly peredachi danykh : pidruchnyk. Kyïv: VPT︠S︡ Kyïvsʹkyĭ universytet, 2007.

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Dubrov, I͡Akiv. Sot︠s︡ionika: Realʹnistʹ ta virtualʹno-mifichni metafory. Lʹviv: TOV "Liha-pres", 2015.

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Bibliotechno-bibliohrafichni klasyfikat︠s︡iï: Istorychna evoli︠u︡t︠s︡ii︠a︡ ta suchasni tendent︠s︡iï rozvytku : monohrafii︠a︡. Kyïv: NAN Ukraïny Nat︠s︡ionalʹna biblioteka imeni V. I. Vernadsʹkoho, 2009.

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In the matter of certain unified communications systems, products used with such systems, and components thereof: Investigation no. 337-TA-598. Washington, DC: U.S. International Trade Commission, 2010.

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In the matter of certain GPS chips, associated software and systems, and products containing same: Investigation no. 337-TA-596. Washington, DC: U.S. International Trade Commission, 2010.

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Частини книг з теми "TA SYSTEMS"

Franke, P., and D. Neuschütz. "Nb-Ta (Niobium - Tantalum)." In Binary Systems. Part 5: Binary Systems Supplement 1, 1–4. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-45280-5_94.

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Bendík, Jaroslav, Ahmet Sencan, Ebru Aydin Gol, and Ivana Černá. "Timed Automata Relaxation for Reachability." In Tools and Algorithms for the Construction and Analysis of Systems, 291–310. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-72016-2_16.

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AbstractTimed automata (TA) have shown to be a suitable formalism for modeling real-time systems. Moreover, modern model-checking tools allow a designer to check whether a TA complies with the system specification. However, the exact timing constraints of the system are often uncertain during the design phase. Consequently, the designer is able to build a TA with a correct structure, however, the timing constraints need to be tuned to make the TA comply with the specification.In this work, we assume that we are given a TA together with an existential property, such as reachability, that is not satisfied by the TA. We propose a novel concept of a minimal sufficient reduction (MSR) that allows us to identify the minimal set S of timing constraints of the TA that needs to be tuned to meet the specification. Moreover, we employ mixed-integer linear programming to actually find a tuning of S that leads to meeting the specification.

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Carow-Watamura, U., D. V. Louzguine, and A. Takeuchi. "Cu-Ta-Zr." In Physical Properties of Ternary Amorphous Alloys. Part 3: Systems from Cr-Fe-P to Si-W-Zr, 172. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-14133-1_40.

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Carow-Watamura, U., D. V. Louzguine, and A. Takeuchi. "Nb-Ni-Ta (318)." In Physical Properties of Ternary Amorphous Alloys. Part 3: Systems from Cr-Fe-P to Si-W-Zr, 339–41. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-14133-1_115.

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Carow-Watamura, U., D. V. Louzguine, and A. Takeuchi. "Nb-Si-Ta (319)." In Physical Properties of Ternary Amorphous Alloys. Part 3: Systems from Cr-Fe-P to Si-W-Zr, 353. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-14133-1_119.

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Carow-Watamura, U., D. V. Louzguine, and A. Takeuchi. "Ni-P-Ta (326)." In Physical Properties of Ternary Amorphous Alloys. Part 3: Systems from Cr-Fe-P to Si-W-Zr, 413. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-14133-1_126.

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Carow-Watamura, U., D. V. Louzguine, and A. Takeuchi. "Ni-Pd-Ta (331)." In Physical Properties of Ternary Amorphous Alloys. Part 3: Systems from Cr-Fe-P to Si-W-Zr, 428. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-14133-1_131.

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Carow-Watamura, U., D. V. Louzguine, and A. Takeuchi. "Ni-Ru-Ta (333)." In Physical Properties of Ternary Amorphous Alloys. Part 3: Systems from Cr-Fe-P to Si-W-Zr, 430. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-14133-1_133.

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Carow-Watamura, U., D. V. Louzguine, and A. Takeuchi. "Si-Ta-Ti (346)." In Physical Properties of Ternary Amorphous Alloys. Part 3: Systems from Cr-Fe-P to Si-W-Zr, 453–55. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-14133-1_147.

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Carow-Watamura, U., D. V. Louzguine, and A. Takeuchi. "Si-Ta-Zr (347)." In Physical Properties of Ternary Amorphous Alloys. Part 3: Systems from Cr-Fe-P to Si-W-Zr, 456–57. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-14133-1_148.

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Тези доповідей конференцій з теми "TA SYSTEMS"

Tempelmeier, Nicolas, Anzumana Sander, Udo Feuerhake, Martin Löhdefink, and Elena Demidova. "TA-Dash." In SIGSPATIAL '20: 28th International Conference on Advances in Geographic Information Systems. New York, NY, USA: ACM, 2020. http://dx.doi.org/10.1145/3397536.3422344.

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Srivastava, Abhishek, Rahul Rai, Karthik Venkatesh, and Bernhard Knigge. "A Method to Reduce Head-Disk Interface (HDI) Degradation Risk During Thermal Asperity (TA) Mapping in a Hard Disk Drive." In ASME 2020 29th Conference on Information Storage and Processing Systems. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/isps2020-1960.

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Анотація:

Abstract One of the issues in thermal asperity (TA) detection using an embedded contact sensor (ECS) is the degradation caused to the read/write elements of the head while interacting with the TA. We propose a method to reduce such head-disk interaction (HDI) during TA detection and classification by flying higher at low thermal fly-height control (TFC) power, which minimizes the interaction of the TA with the head. The key idea is to scan the head at higher fly height, but with higher ECS bias voltage. Initial experiments have shown that the TA count follows a negative cubic relationship with the backoff at various bias levels, and that it follows a square relationship with bias at various backoff levels. Using a sample set, the calibration curves i.e. the golden relationship between these parameters can be established. Using these, one can start the TA detection at the highest backoff and high ECS bias, and start to estimate the nominal TA count. By mapping out these TAs and ensuring the head does not fly over them again to prevent HDI, the fly height can then be lowered, and the rest of the TA cluster can be scanned. Following this method iteratively, the entire TA cluster can be mapped out with minimal interaction with the head. Although this method entails an increase in the test time to detect and map all TAs, compared to detecting them with TFC being on, this can help improve the reliability of the drive by protecting the sensitive read/write elements especially for energy assisted recording from HDI.

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Prejbeanu, I. L., R. C. Sousa, B. Dieny, J. P. Nozieres, S. Bandiera, J. Alvarez-Herault, Q. Stainer, et al. "Scalability and logic functionalities of TA-MRAMs." In 2013 IEEE 11th International New Circuits and Systems Conference (NEWCAS). IEEE, 2013. http://dx.doi.org/10.1109/newcas.2013.6573618.

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Inaba, Hiroshi, Toru Matsumura, Yoko Saito, and Hiroyuki Matsumoto. "Tetrahedral Amorphous Carbon With Ultratrace Hydrogen." In ASME 2014 Conference on Information Storage and Processing Systems. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/isps2014-6928.

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In heat assisted magnetic recording (HAMR) where near-field light from a head heats up a disk, disk overcoat needs to be heat-resistive and transparent. ta-C (tetrahedral amorphous carbon) films have been considered to be promising for HAMR disk overcoat, because they are denser and harder than diamond-like carbon (DLC) films that have been used as disk overcoat. In the previous study, ta-C did not show any change in the film thickness by heating up to 450 degrees Celsius, approving a heat-resistant high protective film [1]. The purpose of this study is to investigate enhanced ta-C, which is harder, denser and higher-thermostability than those of conventional ta-C in reference to that nanometer-sized diamonds were more stable than graphite by adding the small amount of hydrogen [2]. In this report, ultratrace hydrogenerated ta-C, amorphous films, was investigated to expect similar effect as was observed in the crystalline films.

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Mohapatra, Tapas Ku, Asim Ku Dey, and K. K. Mohapatra. "A Novel Non-isolated Positive Output TA Converter." In 2019 IEEE International Conference on Sustainable Energy Technologies and Systems (ICSETS). IEEE, 2019. http://dx.doi.org/10.1109/icsets.2019.8744838.

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Shugurov, A., and et al. "VLIJaNIE SODERZhANIJa Ta V POKRYTIJaH Ti-Al-Ta-N NA IH STRUKTURU I MEHANIChESKIE SVOJSTVA." In International Workshop "Multiscale Biomechanics and Tribology of Inorganic and Organic Systems" ; Mezhdunarodnaja konferencija "Perspektivnye materialy s ierarhicheskoj strukturoj dlja novyh tehnologij i nadezhnyh konstrukcij" ; VIII Vserossijskaja nauchno-prakticheskaja konferencija s mezhdunarodnym uchastiem, posvjashhennaja 50-letiju osnovanija Instituta himii nefti "Dobycha, podgotovka, transport nefti i gaza". Tomsk State University, 2019. http://dx.doi.org/10.17223/9785946218412/302.

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Horin, I. A., Alexander A. Orlikovsky, A. G. Vasiliev, and A. L. Vasiliev. "Phases transformation in Ti(Ta)-Ni(Co)-Si-N systems." In SPIE Proceedings, edited by Kamil A. Valiev and Alexander A. Orlikovsky. SPIE, 2004. http://dx.doi.org/10.1117/12.557297.

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Chung, C. K., T. S. Chen, C. C. Peng, and B. H. Wu. "Fabrication and Characterization of Nanostructured Ta-Si-N Films." In 2007 2nd IEEE International Conference on Nano/Micro Engineered and Molecular Systems. IEEE, 2007. http://dx.doi.org/10.1109/nems.2007.352001.

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Srivastava, Abhishek, Bernd Lamberts, Ning Li, and Bernhard Knigge. "Ranking of Thermal Asperity (TA) Interaction During Seeking Under Various Fly-Height Conditions." In ASME 2020 29th Conference on Information Storage and Processing Systems. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/isps2020-1962.

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Анотація:

Abstract HDD heads have various interaction mechanisms with thermal asperities (TAs), and protection mechanisms need to be put in place to ensure the head-disk interaction (HDI) resulting from them is eliminated or minimized to the highest extent possible. It is straightforward to not allow the head sit-on-track on cylinders that have such TAs on them, and the same principle can be extended to so-called high TAs (HTAs), whose height is more than the fly height of the head, so heads do not inadvertently interact with the TA even when motion is triggered on another head, since the entire head stack moves together. Similar TA interactions also occur when the head seeks across the tracks. Typical short seeks have thermal fly-height control (TFC) turned on while it is turned on during long seeks, which is greater than a few hundred tracks. Heads can also interact with TAs during retract and arrival of the head during such long seeks. Finally, background media scan (BGMS), which is an industry standard, when the drive enters an idle state. Interaction with HTAs can also occur when the drive enters such a state. Typical seek avoidance attempts to eliminate TA interaction during seeking, however it is not straightforward to determine which of the seek mechanism: TFC On during short seeks, retract/arrival during long seeks, HTA interaction during long seeks with TFC off, or idle TA interaction causes the greatest HDI. Through theoretical analysis and experimental corroboration, this paper intends to rank the various modes of TA interaction, so by developing features for eliminating or minimizing them in that order could help bring the maximum benefit for achieving minimum lifetime reduction of the head due to such interaction.

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Kumar, Mukesh, Raj Kumar, Dinesh Kumar, P. M. Raole, P. J. George, Suryakant B. Gupta, and D. K. Paul. "Enhancement of diffusion barrier properties of Ta by plasma immersion ion implantation." In Smart Materials, Structures, and Systems, edited by S. Mohan, B. Dattaguru, and S. Gopalakrishnan. SPIE, 2003. http://dx.doi.org/10.1117/12.514859.

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Звіти організацій з теми "TA SYSTEMS"

Maier, Anna. Technical assistance for community schools: Enabling strong implementation. Learning Policy Institute, August 2022. http://dx.doi.org/10.54300/222.688.

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A growing number of states are launching community school initiatives to ensure family and community engagement, provide enriched and expanded learning, and offer integrated supports for students. This brief offers examples from the National Center for Community Schools and from New York, New Mexico, and California showing how technical assistance can build capacity through consultation, training, coaching, and knowledge building. These examples indicate the ways that states are designing technical assistance (TA) systems to support practitioners, the value of providing differentiated TA supports, and the impact of cross-sector partnerships on TA provision.

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Atkins, W. H., N. G. Pope, W. J. Turner, and R. E. Brown. TA-55 facility control system upgrade project - human-system interface functional requirements. Office of Scientific and Technical Information (OSTI), November 1995. http://dx.doi.org/10.2172/123233.

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Jack E. Malcom. Gamma Radiation Detectors of the TA-55 Waste Line Monitoring System. Office of Scientific and Technical Information (OSTI), June 1999. http://dx.doi.org/10.2172/9450.

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Vigil-Holterman, Luciana. 50608: Waste Stream Profile, TA-55 TRP-III Fire System Replacement System-Asphalt for Recycle. Office of Scientific and Technical Information (OSTI), May 2022. http://dx.doi.org/10.2172/1869583.

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Vigil-Holterman, Luciana. 50550: Waste Stream Profile, TA-55 TRP-III Fire System Replacement System-Concrete for Recycle. Office of Scientific and Technical Information (OSTI), May 2022. http://dx.doi.org/10.2172/1869582.

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Turner, W. J., N. G. Pope, and R. E. Brown. Reliability analysis for the facility data acquisition interface system upgrade at TA-55. Office of Scientific and Technical Information (OSTI), May 1995. http://dx.doi.org/10.2172/72885.

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Esch, Ernst, Jeffrey Goettee, and James Jurney. Power and Power Factor Measurements on the Induction Heating System at TA-46. Office of Scientific and Technical Information (OSTI), October 2014. http://dx.doi.org/10.2172/1160099.

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Storage, Tara M., Robert A. Brockman, and Kevin M. Tienda. Analysis of Data Reduction Strategy used in TA Instruments Q800 DMA Test System. Fort Belvoir, VA: Defense Technical Information Center, July 2013. http://dx.doi.org/10.21236/ada591605.

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Yao, Xiaoqiang. Structural studies of the metal-rich region in the ternary Ta-Nb-S system. Office of Scientific and Technical Information (OSTI), October 1991. http://dx.doi.org/10.2172/5053308.

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Rodriguez, Patrick James. Characterization and refinement of carbide coating formation rates and dissolution kinetics in the Ta-C system. Office of Scientific and Technical Information (OSTI), October 1996. http://dx.doi.org/10.2172/385606.

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