A prestack residual time migration operator

Geophysics ◽  
1996 ◽  
Vol 61 (2) ◽  
pp. 605-607 ◽  
Author(s):  
Robert H. Stolt
Keyword(s):  
Constant Velocity ◽  
Square Root ◽  
Core Concept ◽  
Residual Time ◽  
The Core ◽  
Migration Operator ◽  
Time Migration ◽  
The Difference

Larner and Beasley (1987) present cascaded migration as a way to increase the power and effectiveness of relatively simple migration methods. In particular, f-k migration (Stolt, 1978) can be made to accommodate a depth‐dependent velocity as a cascade of constant‐velocity migrations. The core concept is that data which have been migrated with an approximate velocity can be effectively migrated to their true velocity by migrating with a velocity that is equal to the square root of the difference between the squares of the true and approximate velocities.

scholarly journals Research on Blockchain-Based E-Bidding System

2021 ◽  
Vol 11 (9) ◽  
pp. 4011
Author(s):  
Dan Wang ◽  
Jindong Zhao ◽  
Chunxiao Mu
Keyword(s):  
Data Transmission ◽  
Privacy Protection ◽  
Graph Isomorphism ◽  
Third Party ◽  
Business Logic ◽  
Core Concept ◽  
The Core ◽  
Blockchain Technology ◽  
Smart Contract ◽  
Bidding Process

In the field of modern bidding, electronic bidding leads a new trend of development, convenience and efficiency and other significant advantages effectively promote the reform and innovation of China’s bidding field. Nowadays, most systems require a strong and trusted third party to guarantee the integrity and security of the system. However, with the development of blockchain technology and the rise of privacy protection, researchers has begun to emphasize the core concept of decentralization. This paper introduces a decentralized electronic bidding system based on blockchain and smart contract. The system uses blockchain to replace the traditional database and uses chaincode to process business logic. In data interaction, encryption techniques such as zero-knowledge proof based on graph isomorphism are used to improve privacy protection, which improves the anonymity of participants, the privacy of data transmission, and the traceability and verifiable of data. Compared with other electronic bidding systems, this system is more secure and efficient, and has the nature of anonymous operation, which fully protects the privacy information in the bidding process.

Models for Integrating Medical Acupuncture into Practice: An Exploratory Qualitative Study of Physicians— Experiences

2016 ◽  
Vol 34 (4) ◽  
pp. 280-289 ◽  
Author(s):  
Ellen T Crumley
Keyword(s):  
Qualitative Study ◽  
General Practitioners ◽  
Full Time ◽  
Snowball Sampling ◽  
Core Concept ◽  
Structured Interviews ◽  
The Core ◽  
Individual Physician ◽  
Part Time ◽  
Medical Acupuncture

Background Internationally, physicians are integrating medical acupuncture into their practice. Although there are some informative surveys and reviews, there are few international, exploratory studies detailing how physicians have accommodated medical acupuncture (eg, by modifying schedules, space and processes). Objective To examine how physicians integrate medical acupuncture into their practice. Methods Semi-structured interviews and participant observations of physicians practising medical acupuncture were conducted using convenience and snowball sampling. Data were analysed in NVivo and themes were developed. Despite variation, three principal models were developed to summarise the different ways that physicians integrated medical acupuncture into their practice, using the core concept of ‘helping’. Quotes were used to illustrate each model and its corresponding themes. Results There were 25 participants from 11 countries: 21 agreed to be interviewed and four engaged in participant observations. Seventy-two per cent were general practitioners. The three models were: (1) appointments (44%); (2) clinics (44%); and (3) full-time practice (24%). Some physicians held both appointments and regular clinics (models 1 and 2). Most full-time physicians initially tried appointments and/or clinics. Some physicians charged to offset administration costs or compensate for their time. Discussion Despite variation within each category, the three models encapsulated how physicians described their integration of medical acupuncture. Physicians varied in how often they administered medical acupuncture and the amount of time they spent with patients. Although 24% of physicians surveyed administered medical acupuncture full-time, most practised it part-time. Each individual physician incorporated medical acupuncture in the way that worked best for their practice.

Spatial Convergence in Height in Central Europe, 1890-1910

2009 ◽  
pp. 90
Author(s):  
Marek Brabec ◽  
John Komlos
Keyword(s):  
Global Economy ◽  
Well Being ◽  
Habsburg Monarchy ◽  
The Core ◽  
Military Recruits ◽  
Convergence Clubs ◽  
Spatial Convergence ◽  
Physical Stature ◽  
The Difference ◽  
Peripheral Areas

We examine spatial convergence in biological well-being in the Habsburg Monarchy, circa 1890-1910, on the basis of evidence of the physical stature of 21-year-old military recruits, disaggregated into 15 Districts. We find that the shorter the population in 1890, the faster its height grew thereafter. Hence, there was convergence in physical stature between the peripheral areas of the monarchy (located in today’s Poland/Ukraine, Romania, and Slovakia) and its core (located in today’s Austria, Czech Republic, and Hungary). The difference in trends between the trend in height in the Polish District of Przemysl and in Vienna was about 0.9 cm per decade, in favor of the former. Convergence among the core Districts themselves was minimal or non-existent, whereas the convergence among the peripheral Districts was more pronounced. Spatial convergence also took place between the peripheral regions and the more developed ones. The pattern is somewhat reminiscent of modern findings on convergence clubs in the global economy.

Gebruiksaspecten van het uitroeppartikel wat in het Nederlands en Fries

2020 ◽  
Vol 136 (4) ◽  
pp. 189-209
Author(s):  
Henk Wolf
Keyword(s):  
The Core ◽  
The Difference ◽  
Lexical Phrase ◽  
High Degree ◽  
Lexical Phrases

Abstract Both Dutch and (West) Frisian make use of the exclamative particle wat (‘how’), that adds an element of surprise about a high degree of something to the semantics of the sentence. In this paper I will first show the similarities between the use of the particle in the two languages. I will demonstrate that, in Dutch, its use is largely confined to constructions that are semantically scalable, whereas in Frisian this restriction is far less strict. I will explain the difference by showing that Dutch wat is a syntactic amplifier of lexical phrases, whereas Frisian wat has developed into a pragmatic amplifier of the core predicate. I will try to account for that difference by showing how homophonous words absent in Dutch are likely to have influenced the use of Frisian wat, and how Dutch prosody strengthens the connection between wat and the amplified lexical phrase, whereas Frisian prosody weakens it. Finally, I will show that the system described as ‘Frisian’ is occasionally found in varieties of Dutch too

scholarly journals A comparative analysis of differentially expressed mRNAs, miRNAs and circRNAs provides insights into the key genes involved in the high-altitude adaptation of yaks

BMC Genomics ◽  
2021 ◽  
Vol 22 (1) ◽  
Author(s):  
Qianyun Ge ◽  
Yongbo Guo ◽  
Wangshan Zheng ◽  
Yuan Cai ◽  
Xuebin Qi ◽  
...  
Keyword(s):  
High Altitude ◽  
Molecular Mechanisms ◽  
Regulation Of Gene Expression ◽  
Differentially Expressed ◽  
The Tibetan Plateau ◽  
The Core ◽  
Processing Pathways ◽  
Genetic Information Processing ◽  
Altitude Adaptation ◽  
The Difference

Abstract Background Yaks that inhabit the Tibetan Plateau exhibit striking phenotypic and physiological differences from cattle and have adapted well to the extreme conditions on the plateau. However, the mechanisms used by these animals for the regulation of gene expression at high altitude are not fully understood. Results Here, we sequenced nine lung transcriptomes of yaks at altitudes of 3400, 4200 and 5000 m, and low-altitude Zaosheng cattle, which is a closely related species, served as controls. The analysis identified 21,764 mRNAs, 1377 circRNAs and 1209 miRNAs. By comparing yaks and cattle, 4975 mRNAs, 252 circRNAs and 75 miRNAs were identified differentially expressed. By comparing yaks at different altitudes, we identified 756 mRNAs, 64 circRNAs and 83 miRNAs that were differentially expressed (fold change ≥2 and P-value < 0.05). The pathways enriched in the mRNAs, circRNAs and miRNAs identified from the comparison of yaks and cattle were mainly associated with metabolism, including ‘glycosaminoglycan degradation’, ‘pentose and glucuronate interconversions’ and ‘flavone and flavonol biosynthesis’, and the mRNAs, circRNAs and miRNAs identified from the comparison of yaks at different altitude gradients were significantly enriched in metabolic pathways and immune and genetic information processing pathways. The core RNAs were identified from the mRNA-miRNA-circRNA networks constructed using the predominant differentially expressed RNAs. The core genes specific to the difference between yaks and cattle were associated with the endoplasmic reticulum and fat deposition, but those identified from the comparison among yaks at different altitude gradients were associated with maintenance of the normal biological functions of cells. Conclusions This study enhances our understanding of the molecular mechanisms involved in hypoxic adaptation in yaks and might contribute to improvements in the understanding and prevention of hypoxia-related diseases.

scholarly journals Territorial organization of the restaurant facilities of Kyiv agglomeration

2015 ◽  
pp. 79-82
Author(s):  
K. Dmytriieva
Keyword(s):  
Restaurant Industry ◽  
The Core ◽  
Industry Standards ◽  
The Status ◽  
Territorial Organization ◽  
The Difference ◽  
Surrounding Areas ◽  
Concentration Ratios

The article outlines the factors of development of the restaurant facilities in Kyiv and surrounding areas. The status of the territorial organization of the restaurant facilities of Kyiv and Kyiv region through the review of the main indicators of the industry by districts in 2013 has been analyzed. Comparison of the industry standards due to availability of these services to population needs has been performed. The result of the difference of efficiency of the restaurant industry through calculation of concentration ratios turnover has been received. Area that can be considered as the core of the restaurant industry of Kyiv agglomeration and area with the potential of growth has been identified. The article visualized by maps.

scholarly journals The Core Concept of Statistics

2019 ◽  
pp. 23-50
Author(s):  
Michael H. Herzog ◽  
Gregory Francis ◽  
Aaron Clarke
Keyword(s):  
Core Concept ◽  
The Core

Effects Of The COVID -19 Pandemıc On The Elderly: A Grounded Theory Study From Turkey

2021 ◽  
Vol 8 (1) ◽  
pp. 252-266
Author(s):  
Ahmet Koşar ◽  
Aytul Kasapoglu
Keyword(s):  
Qualitative Research ◽  
Grounded Theory ◽  
The Elderly ◽  
Age Group ◽  
Core Concept ◽  
Grounded Theory Methodology ◽  
Grounded Theory Study ◽  
The Core ◽  
Starting Point ◽  
The World

More than 95 percent of those who lost their lives as a result of the spread of the Covid-19 virus to the world since the beginning of 2020 are over the age of 60 (WHO, 2020). The main purpose of this article is to reveal the vital difficulties of the 65-75 age group in Turkey, who were quarantined due to the Covid-19 pandemic, as a result of deprivation of their former normal lives and how they overcame them. The theoretical starting point of this study is the relational sociologist H. White and his “uncertainty” classification. In the study, Grounded Theory Methodology was chosen as one of the qualitative research approaches and open, axial and selective codings were made as a requirement of this. In this context, interviews were made with 12 individuals from the 65-75 age group and the data were presented in figures. As a result of open, axial and selective coding, the core concept of the study was determined as "solidarity". In accordance with the grounded theory, at the end of the study, the "solidarity process" was narrated using the "river" metaphor.

7. Terms of the contract I

2018 ◽  
Author(s):  
Janet O’Sullivan
Keyword(s):  
Contextual Approach ◽  
The Core ◽  
The Subject ◽  
The Difference

Titles in the Core Text series take the reader straight to the heart of the subject, providing focused, concise, and reliable guides for students at all levels. This chapter examines issues related to the terms of the contract. It explains the distinction between terms and mere representations, and analyses the difference between signed and unsigned contracts in relation to the incorporation of express. This chapter also considers the parol evidence rule and the modern contextual approach to contractual interpretation. Finally it considers implied terms, which can be implied by statute or by the courts.

The Meaning of System

2014 ◽  
Vol 1 (1) ◽  
pp. 21-34 ◽  
Author(s):  
Steen Leleur
Keyword(s):  
Systems Theory ◽  
Complexity Theory ◽  
Explanatory Power ◽  
Theoretical Interest ◽  
Core Concept ◽  
The Core ◽  
Systems Practice ◽  
Actual Meaning ◽  
Current Systems ◽  
Real World Problems

This article reviews the generic meaning of ‘system’ and complements more conventional system notions with a system perception based on recent complexity theory. With system as the core concept of systems theory, its actual meaning is not just of theoretical interest but is highly relevant also for systems practice. It is argued that complexity theory and thinking with reference to Luhmann a.o. ought to be recognised and paid attention to by the systems community. Overall, it is found that a complexity orientation may contribute to extend and enrich the explanatory power of current systems theory when used to complex real-world problems. As regards systems practice it is found that selective use and combination of five presented research approaches (functionalist, interpretive, emancipatory, postmodern and complexity) which function as different but complementing ‘epistemic lenses’ in a process described as constructive circularity, may strengthen the exploration and learning efforts in systems-based intervention.

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