130,153 research outputs found
The deconfinement transition for quenched SU(2) lattice QCD with Wilson fermions
No full textEngels J, Karsch F. The deconfinement transition for quenched SU(2) lattice QCD with Wilson fermions. Physics Letters, B. 1983;125(6):481-486
Partial wave relations in [pi][Lambda] scattering and the [Sigma][Lambda][pi] coupling constant
No full textEngels J. Partial wave relations in [pi][Lambda] scattering and the [Sigma][Lambda][pi] coupling constant. Nuclear Physics, B. 1973;51:269-288
On the existence of additional zero temperature phase transitions in SU(2) lattice gauge theory
No full textEngels J, Seixas J. On the existence of additional zero temperature phase transitions in SU(2) lattice gauge theory. Physics Letters, B. 1988;206(2):295-298
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
The high-temperature behaviour of lattice QCD with fermions
No full textEngels J, Karsch F, Satz H. The high-temperature behaviour of lattice QCD with fermions. Physics Letters, B. 1982;113(5):398-404
The Memory Function of the B Cell Antigen Receptor
No full textActivated B lymphocytes preserve their antigen experience by differentiating into long-lived pools of antibody-secreting plasma cells or various types of memory B cells (MBCs). The former population constantly produces serum immunoglobulins with sufficient specificity and affinity to thwart infections with recurrent pathogens. By contrast, memory B cell populations retain their antigen receptors on the cell surface and hence need pathogen-induced differentiation steps before they can actively contribute to host defense. The terminal differentiation of MBCs into antibody-secreting plasma cells is hallmarked by the absence of the lag phase characteristic for primary antibody responses. Moreover, secondary antibody responses are predominantly driven by MBCs that bear an antigen receptor of the IgG class on their surface although IgM-positive memory populations exist as well. These fundamental principles of B cell memory were enigmatic for decades. Only recently, we have begun to understand the underlying mechanisms. This review summarizes our current understanding of how different subpopulations of MBCs are generated during primary immune responses and how their functional heterogeneity on antigen recall is controlled by different signaling capabilities of B cell antigen receptor (BCR) isotypes and by the nature of the antigen
Finite-temperature lattice QCD with Wilson fermions
No full textÇelik T, Engels J, Satz H. Finite-temperature lattice QCD with Wilson fermions. Nuclear Physics, B. 1985;256:670-686
FIGURE 2. Sarcoglottis matogrossensis Engels & E.C.Smidt.—A in A new Sarcoglottis (Orchidaceae: Spiranthinae) from the southern Brazilian Amazon
No full textFIGURE 2. Sarcoglottis matogrossensis Engels & E.C.Smidt.—A. Habit of three leafless flowering individuals. B. Inflorescence. C. Flower in frontal view. D. Flower in oblique view. E. Flower in lateral view. F. Habit of leafy individuals, before flowering. G. Leaf adaxial and abaxial surfaces. Photos by M.E. Engels based on the type.Published as part of Engels, Mathias Erich & Smidt, Eric De Camargo, 2021, A new Sarcoglottis (Orchidaceae: Spiranthinae) from the southern Brazilian Amazon, pp. 171-176 in Phytotaxa 487 (2) on page 174, DOI: 10.11646/phytotaxa.487.2.8, http://zenodo.org/record/575755
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Dynamical and Bose-Einstein correlations of centrally produced pion pairs in hadron-hadron collisions
No full textEngels J, Schilling K. Dynamical and Bose-Einstein correlations of centrally produced pion pairs in hadron-hadron collisions. Nuclear Physics, B. 1978;136(2):349-364.We calculate dynamical and Bose-Einstein inclusive correlations of pion pairs (as functions of the invariant pair mass M [pi][pi]) from the decay of independently produced clusters, whose finite size is explicitly taken into account. We show that recent pp bubble chamber data from FNAL on the correlation functions C 2(M'[pi][pi]) for centrally produced [pi] + [pi] - and [pi] - [pi] - pairs can be understood within this picture. Some implications for Hanbury-Brown-Twiss type analyses are discussed
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