Measuring the scale parameter of quantum chromodynamics at CHEER

1981 ◽  
Vol 59 (11) ◽  
pp. 1769-1773
Author(s):  
Lawrence M. Krauss
Keyword(s):  
Quantum Chromodynamics ◽  
Scale Parameter ◽  
Structure Functions ◽  
High Q ◽  
Advantages And Disadvantages ◽  
Almost All

The possibility of measuring the scale parameter of quantum chromodynamics, Λs, at CHEER is discussed. Rationale for the measurement of this quantity are given, along with a discussion of the theoretical difficulties involved. The measurement of the Q2 dependence of structure functions and their moments, and methods of measuring αs and its Q2 evolution, are discussed, and arguments are given for the advantages and disadvantages of going to high Q2 values at CHEER. It is concluded that while sensitivity to Λ is lowered at high Q2, CHEER will, in principle, be able to provide the first clean measurements of Λ, free from almost all the theoretical confusion involved in interpretations of present data.

scholarly journals STRUCTURE FUNCTIONS IN DEEP INELASTIC LEPTON-NUCLEON SCATTERING

2000 ◽  
Vol 15 (supp01b) ◽  
pp. 467-494 ◽  
Author(s):  
MAX KLEIN
Keyword(s):  
Inelastic Scattering ◽  
Structure Function ◽  
Deep Inelastic Scattering ◽  
Gluon Distribution ◽  
Structure Functions ◽  
Heavy Flavor ◽  
Nucleon Scattering ◽  
High Q ◽  
Low X

This report presents the latest results on structure functions, as available at the Lepton-Photon Symposium 1999. It focuses on three experimental areas: new structure function measurements, in particular from HERA at low x and high Q2; results on light and heavy flavor densities; and determinations of the gluon distribution and of αs. As the talk was delivered at a historic moment and place, a few remarks were added recalling the exciting past and looking into the promising future of deep inelastic scattering (DIS).

Brain Tumor Reporting and Data System: A Pictorial Review

Neurographics ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 175-185
Author(s):  
B. Rao ◽  
I. Ikuta ◽  
A. Mahajan ◽  
A.A. Karam ◽  
V.M. Zohrabian
Keyword(s):  
Brain Tumor ◽  
Brain Tumors ◽  
Response To Therapy ◽  
Data System ◽  
Imaging Features ◽  
New Paradigm ◽  
Advantages And Disadvantages ◽  
Pictorial Review ◽  
Almost All ◽  
The Brain

Brain tumors are a diverse group of neoplasms that are a source of substantial morbidity and mortality worldwide. Primary gliomas constitute almost all malignant brain tumors, with the most aggressive as well as most common form in adults, grade IV glioma or glioblastoma multiforme, carrying an especially poor prognosis. Neuroimaging is critical not only in the identification of CNS tumor but also in treatment-planning and assessing the response to therapy. Structured reporting continues to gain traction in radiology by reducing report ambiguity and improving consistency, while keeping referring clinicians and patients informed. The Brain Tumor Reporting and Data System (BT-RADS) is a relatively new paradigm that attempts to simplify and maximize consistency in radiologic reporting. BT-RADS incorporates MR imaging features, clinical assessment, and timing of therapy to assign each study a score or category, which is, in turn, linked to a management suggestion. The purpose of this pictorial review article is to familiarize radiologists and nonradiology neurologic specialists alike with BT-RADS, highlighting both advantages and limitations, in the hope that adoption of this system might ultimately facilitate more effective communication and improve consistency among reports.Learning Objective: To describe the features and underscore the advantages and disadvantages of the Brain Tumor Reporting and Data System (BT-RADS), a relatively new classification system that attempts to simplify and maximize consistency in radiologic reporting

SPIN STRUCTURE FUNCTIONS OF THE NUCLEON

1992 ◽  
Vol 01 (03) ◽  
pp. 505-524 ◽  
Author(s):  
ROBERT D. CARLITZ
Keyword(s):  
Quantum Chromodynamics ◽  
Quark Model ◽  
Spin Structure ◽  
Structure Functions ◽  
Running Coupling ◽  
Polarized Protons ◽  
Spin Structure Functions

These lectures discuss the substructure of the nucleon, first on the scale of 1 fermi and then at much shorter distances. We review relevant features of the quark model and introduce Quantum Chromodynamics and the idea of a running coupling. Recent data involving polarized protons is discussed in this framework, and an outlook is presented for future experiments relating to the spin substructure of the nucleon.

The principle of minimum sensitivity and moments of nonsinglet structure functions

1983 ◽  
Vol 61 (1) ◽  
pp. 99-101 ◽  
Author(s):  
Gerry McKeon
Keyword(s):  
Perturbation Theory ◽  
Quantum Chromodynamics ◽  
Finite Order ◽  
Parton Model ◽  
Structure Functions ◽  
Renormalization Procedure ◽  
Dependent Part ◽  
Model Predictions ◽  
Minimum Sensitivity

The corrections implied by quantum chromodynamics to parton model predictions are not unique to finite order in perturbation theory on account of the possibility of choosing different renormalization schemes. Stevenson has provided a criterion for selecting the "best" renormalization procedure; the so-called "principle of minimum sensitivity" (PMS). This criterion is applied here to the Q2-dependent part of the moments of the nonsinglet structure functions in lepton–hadron scattering.

scholarly journals Students’ evaluation of using Google Classroom in project-based learning in faculty of English, Hanoi National University of Education

2019 ◽  
Vol 3 (2) ◽  
pp. 40-44
Author(s):  
Giang Thi Kieu Nguyen ◽  
Huong Thi Dinh
Keyword(s):  
21St Century ◽  
Teaching And Learning ◽  
Project Based Learning ◽  
Traditional Classroom ◽  
Academic Environment ◽  
Advantages And Disadvantages ◽  
The Past ◽  
School Subjects ◽  
National University ◽  
Almost All

Traditional classroom has so far been a common place for learning almost all school subjects and courses of different fields. In language teaching and learning within the 21st century context, the use of Google Classroom is not new, so is the research on the benefits and barriers of this virtual academic place. Being used as a supportive device for teaching and learning in several subjects over the past semesters, “Google Classroom” has become a familiar term among English majors in the Faculty of English, Hanoi National University of Education. This proposed study will explore the applications of this virtual academic environment in project-based learning, focusing on investigating students’ perspectives on its advantages and disadvantages, as well as their expectations and suggestions for an optimal use.

scholarly journals Ukrainian Gigonomy: Transformation of Employment, Risks and Prospects

2021 ◽  
pp. 43-72
Author(s):  
OLENA IVANENKO
Keyword(s):  
Intrinsic Value ◽  
General Structure ◽  
Developed Countries ◽  
Soviet Society ◽  
Economic Changes ◽  
Digital Platforms ◽  
Advantages And Disadvantages ◽  
Gig Economy ◽  
Working Age ◽  
Almost All

The article deals with the transformation of the employment structure and gigonomics. Today, such economic model is becoming the dominant option of choice, which is working in almost all the spheres and sectors of the economy and is increasingly conquering the world. The employment of the population represents the general structure of the economy and changes with it, reflecting the state of development of the country. Structural economic changes have led to a change in the usual forms and types of employment of the population. The market economy served as an impetus for a change in the structure of employment in the former Soviet society, and global economic processes have unified these changes. Today, the dominant trend is the shift of the main vector of economic activity from the sphere of production to the sphere of service (in various industries), small and medium-sized businesses, the applying of the principles of freelancing and outsourcing. There is also a decrease in employment in the fields of science, education, medicine; the science loses its prestige and intrinsic value, scientific knowledge is devalued, and intellectual work is increasingly concentrating in the field of computer technology, creating a huge number of new specialties and professions that require different fundamental training, high qualifications and a large number of work places. The standard principles of organizing the work process are giving way to non-standard ones; preference is given to freedom of choice, flexibility and independence etc. The digital economy and work on digital platforms are relevant, modern and promising, but they are not devoid of certain risks and dangers. Platform employment is precarious, unstable, socially and legally vulnerable, although in developed countries almost a third of the working-age population is employed in the gig economy today. In the article, there are investigated the peculiarities of Ukrainian gigonomics based on the materials of a survey conducted by the author among gig workers in Kiev — taxi drivers of online services (Uber, Uklon, Bolt) and food delivers (Glovo, Bolt Food, Rocket). Besides, there are clarified main advantages and disadvantages of such work and there are described its threats and prospects.

scholarly journals A Complex Component of the Nervous System: Brachial Plexus

2018 ◽  
Vol 1 (1) ◽  
pp. 01-06
Author(s):  
Nephthys Sanzhar ◽  
Erasyl M Davis ◽  
M.K. Siminoski
Keyword(s):  
Brachial Plexus ◽  
Imaging Modality ◽  
Traumatic Injury ◽  
Screening Method ◽  
Imaging Method ◽  
Full Potential ◽  
Brachial Plexopathy ◽  
Advantages And Disadvantages ◽  
Obstetric Brachial Plexus ◽  
Almost All

Brachial plexopathy is a type of peripheral neuropathy. Injuries to the brachial plexus can be classified according to their severity, ranging from neuropraxia, the mildest form, to axonotmesis and neurotmesis, the most severe forms. The causes of brachial plexopathy include traumatic and non-traumatic injuries. Because the brachial plexus can sustain various types of injuries, different imaging modalities are required. Recent advances in diagnostic imaging have enabled better investigation of brachial plexopathy. This article reviews the major and most widely used imaging methods used for investigating brachial plexopathy along with newer modalities. The indications, advantages, and disadvantages of each modality are examined. The major factor in realizing the full potential of any imaging method is the knowledge of the requesting physician about the capabilities and limitations of each method. Magnetic resonance imaging (MRI) is the standard imaging modality for evaluating non-traumatic injury to the brachial plexus; however, there are several limitations to its use and, therefore, other modalities should be pursued. MR myelography should be used for traumatic meningoceles and root avulsions. MR neurography is a relatively new technique with massive potential. It is a tissue-specific modality with the ability to elicit morphological as well as pathological features of nerves. CT myelography is the gold standard for evaluating traumatic injury of the brachial plexus. Other potential uses are with tumors of the brachial plexus as well as obstetric brachial plexus palsies. Finally, sonography is addressed. With its ability to detect almost all plexopathies and the fact that it does not employ radiation and can be done in virtually every patient, it should be the baseline or, at least, the screening method for plexopathies.

scholarly journals Predicting Turning Points of the Russian Economic Cycle Using Composite Leading Indicators

2020 ◽  
Vol 27 (4) ◽  
pp. 53-65
Author(s):  
S. V. Smirnov
Keyword(s):  
Turning Points ◽  
Decision Rules ◽  
Leading Indicators ◽  
Economic Cycle ◽  
Advantages And Disadvantages ◽  
Expert Opinions ◽  
Russian Economy ◽  
Methodological Approaches ◽  
Almost All ◽  
Key Indicators

The article provides a brief overview of the background of constructing composite leading indicators (CLI) for Russia; the paper defines key indicators which currently are calculated and published monthly; they can be put in practice to monitor the Russian economy. The underlying methodological approaches are analyzed, along with their advantages and disadvantages. The importance of accounting for a factor of regular or irregular updates and revisions of methods for calculating the CLI is emphasized. Due to them not only the current but also the “historical” dynamics of the indices occasionally change. The paper compares various CLI components and reveals both similarities and differences in the notion of the cyclical dynamics of individual components, reaching the point that the same indicators depending on the methodology are considered as leading, or as lagging. A set of “core” indicators included in the calculation of almost all Russian CLIs is determined; the author also noted those indicators that are widely used in other countries but not yet in Russia, for various reasons.Special attention is paid to the problems of dating economic cycle turning points, in particular, those arising from different notions of the very concept of the economic cycle. Dating using formal statistical methods, firstly, is mostly determined by purely technical (and not substantive) nuances, and secondly, it often changes retroactively when revising historical time series. Analysis of global experience indicates that the way out of this impasse can be the detecting of cyclical turning points based on the decisions of the special expert council, whose sole tasks include dating cyclical peaks and troughs. The article describes methodological approaches that the Economic Cycle Dating Committee (Russian Dating Committee, RDC) under the Association of Russian Economic Think Tanks (ARETT), is supposed to follow.The final part of the article analyzes the ability of various Russian CLIs to timely warn when a new phase of the economic cycle is approaching, especially the impending recession. It is shown that expert opinions on the future dynamics of the Russian economy, contained in monthly press releases, are often more accurate than the conclusions that can be obtained based on the CLI trajectory using purely formal decision rules. On this basis, it is concluded that the existing Russian CLIs can be improved; this calls for clarification and finally fixing the dating of cyclical turning points (peaks and troughs), as well as for conducting additional research to identify various economic and financial indicators as the leading, synchronous or lagging indicators of the Russian economic cycle.

Building a Comprehensive Clinical Information System from Components

2003 ◽  
Vol 42 (01) ◽  
pp. 01-07 ◽  
Author(s):  
S.P. Narus ◽  
S.M. Huff ◽  
T.A. Pryor ◽  
P.J. Haug ◽  
T. Larkin ◽  
...  
Keyword(s):  
Information System ◽  
Information Systems ◽  
Clinical Information System ◽  
Clinical Information ◽  
Data Repository ◽  
Attractive Alternative ◽  
Systems Architecture ◽  
Advantages And Disadvantages ◽  
Information Systems Architecture ◽  
Almost All

Summary Objectives: To discuss the advantages and disadvantages of an interfaced approach to clinical information systems architecture. Methods: After many years of internally building almost all components of a hospital clinical information system (HELP) at Intermountain Health Care, we changed our architectural approach as we chose to encompass ambulatory as well as acute care. We now seek to interface applications from a variety of sources (including some that we build ourselves) to a clinical data repository that contains a longitudinal electronic patient record. Results: We have a total of 820 instances of interfaces to 51 different applications. We process nearly 2 million transactions per day via our interface engine and feel that the reliability of the approach is acceptable. Interface costs constitute about four percent of our total information systems budget. The clinical database currently contains records for 1.45 m patients and the response time for a query is 0.19sec. Discussion: Based upon our experience with both integrated (monolithic) and interfaced approaches, we conclude that for those with the expertise and resources to do so, the interfaced approach offers an attractive alternative to systems provided by a single vendor. We expect the advantages of this approach to increase as the costs of interfaces are reduced in the future as standards for vocabulary and messaging become increasingly mature and functional.

Sign in / Sign up

Export Citation Format

Share Document