76 research outputs found
Scattering theory with a natural regularization: Rediscovering the J-matrix method
In three dimensional scattering, the energy continuum wavefunction is
obtained by utilizing two independent solutions of the reference wave equation.
One of them is typically singular (usually, near the origin of configuration
space). Both are asymptotically regular and sinusoidal with a phase difference
(shift) that contains information about the scattering potential. Therefore,
both solutions are essential for scattering calculations. Various
regularization techniques were developed to handle the singular solution
leading to different well-established scattering methods. To simplify the
calculation the regularized solutions are usually constructed in a space that
diagonalizes the reference Hamiltonian. In this work, we start by proposing
solutions that are already regular. We write them as infinite series of square
integrable basis functions that are compatible with the domain of the reference
Hamiltonian. However, we relax the diagonal constraint on the representation by
requiring that the basis supports an infinite tridiagonal matrix representation
of the wave operator. The hope is that by relaxing this constraint on the
solution space a larger freedom is achieved in regularization such that a
natural choice emerges as a result. We find that one of the resulting two
independent wavefunctions is, in fact, the regular solution of the reference
problem. The other is uniquely regularized in the sense that it solves the
reference wave equation only outside a dense region covering the singularity in
configuration space. However, asymptotically it is identical to the irregular
solution. We show that this natural and special regularization is equivalent to
that already used in the J-matrix method of scattering.Comment: 10 page
Knee stiffness post anterior cruciate ligament reconstruction- factors to worry about
Background: Knee stability is affected by integrity of anterior cruciate ligament (ACL). Knee stiffness is a worrying postoperative complication, preventing patients from returning back to pre-injury sport level. In this study, we analyzed incidence of knee stiffness post ACL reconstruction and possible associated risk factors.
Methods: This is retrospective study, was held in Royal Medical Services/Jordan–Queen Alia Military hospital/Arthroscopic and Sport injuries division. We analyzed 250 patients’ data using computerized patients record system (CPRS) called Hakeem complaining of knee stiffness post ACL reconstruction between July 2022 and July 2023, whom ACL reconstructive surgeries were performed between March and September 2022.
Results: Incidence of knee stiffness post ACL reconstruction is about 1.5% (4 out of 250). All of those 4 patients were males,3 of them had limited flexion (75%), while 1 of them had limited extension (25%). All of the 3 patients having extension contracture had an associated medial meniscus tear, repaired at time of ACL reconstruction, while flexion contracture patient had an isolated ACL tear.
Conclusions: Incidence of knee stiffness post ACL reconstruction is about 1.5%. 75% of patients were associated with medial meniscus tear, who underwent meniscus repair and hinged knee brace was applied. We conclude that ACL patients having an associated meniscus tear managed by meniscus repair and hinge knee brace are at higher risk to develop knee stiffness. Therefore, we recommend limiting the usage of knee brace for ACL reconstruction with meniscus repair only
Differences in Neuropsychological Performance between Refugee and Non-Refugee Children in Palestine
Neuropsychological studies on refugee children are scarce, but there are even less in the case
of Palestinian children. This work aims to study the neuropsychological performance of Palestinian
refugee children in Palestine compared to other Palestinian children living outside refugee camps. A
comprehensive Neuropsychological battery was administrated to 584 Palestinian school children
(464 refugees and 120 non-refugees) aged 6, 7, and 8 years old. Results showed that non-refugee
children outperformed refugee children in sustained attention, verbal comprehension, verbal memory,
and visual memory. This study is the first to have performed a comprehensive neuropsychological
assessment, based on a standardized and validated battery with the Palestinian refugee children. It
supports professionals in their evaluation of neurodevelopment and neuropsychological alterations
in refugee and non-refugee children in Palestine.Center for Development Cooperation Initiatives (Centro
de Iniciativas de Cooperación al Desarrollo—CICODE), Granada University, Spain (Reference No.
C14P11_9359
Shiga Toxin and Lipopolysaccharide Induce Platelet-Leukocyte Aggregates and Tissue Factor Release, a Thrombotic Mechanism in Hemolytic Uremic Syndrome
BACKGROUND: Aggregates formed between leukocytes and platelets in the circulation lead to release of tissue factor (TF)-bearing microparticles contributing to a prothrombotic state. As enterohemorrhagic Escherichia coli (EHEC) may cause hemolytic uremic syndrome (HUS), in which microthrombi cause tissue damage, this study investigated whether the interaction between blood cells and EHEC virulence factors Shiga toxin (Stx) and lipopolysaccharide (LPS) led to release of TF. METHODOLOGY/PRINCIPAL FINDINGS: The interaction between Stx or LPS and blood cells induced platelet-leukocyte aggregate formation and tissue factor (TF) release, as detected by flow cytometry in whole blood. O157LPS was more potent than other LPS serotypes. Aggregates formed mainly between monocytes and platelets and less so between neutrophils and platelets. Stimulated blood cells in complex expressed activation markers, and microparticles were released. Microparticles originated mainly from platelets and monocytes and expressed TF. TF-expressing microparticles, and functional TF in plasma, increased when blood cells were simultaneously exposed to the EHEC virulence factors and high shear stress. Stx and LPS in combination had a more pronounced effect on platelet-monocyte aggregate formation, and TF expression on these aggregates, than each virulence factor alone. Whole blood and plasma from HUS patients (n = 4) were analyzed. All patients had an increase in leukocyte-platelet aggregates, mainly between monocytes and platelets, on which TF was expressed during the acute phase of disease. Patients also exhibited an increase in microparticles, mainly originating from platelets and monocytes, bearing surface-bound TF, and functional TF was detected in their plasma. Blood cell aggregates, microparticles, and TF decreased upon recovery. CONCLUSIONS/SIGNIFICANCE: By triggering TF release in the circulation, Stx and LPS can induce a prothrombotic state contributing to the pathogenesis of HUS
A Hybrid Fuzzy Multi-criteria Decision Making Model to Evaluate the Overall Performance of Public Emergency Departments: A Case Study
[EN] Performance evaluation is relevant for supporting managerial decisions related to the improvement of public emergency departments (EDs). As different criteria from ED context and several alternatives need to be considered, selecting a suitable Multicriteria Decision-Making (MCDM) approach has become a crucial step for ED performance evaluation. Although some methodologies have been proposed to address this challenge, a more complete approach is still lacking. This paper bridges this gap by integrating three potent MCDM methods. First, the Fuzzy Analytic Hierarchy Process (FAHP) is used to determine the criteria and sub-criteria weights under uncertainty, followed by the
interdependence evaluation via fuzzy Decision-Making Trial and Evaluation Laboratory(FDEMATEL). The fuzzy logic is merged with AHP and DEMATEL to illustrate vague judgments. Finally, the Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS) is used for
ranking EDs. This approach is validated in a real 3-ED cluster. The results revealed the critical role of Infrastructure (21.5%) in ED performance and the interactive nature of Patient safety (C+R =12.771).
Furthermore, this paper evidences the weaknesses to be tackled for upgrading the performance of each ED.Ortiz-Barrios, M.; Alfaro Saiz, JJ. (2020). A Hybrid Fuzzy Multi-criteria Decision Making Model to Evaluate the Overall Performance of Public Emergency Departments: A Case Study. International Journal of Information Technology & Decision Making. 19(6):1485-1548. https://doi.org/10.1142/S0219622020500364S14851548196Lord, K., Parwani, V., Ulrich, A., Finn, E. B., Rothenberg, C., Emerson, B., … Venkatesh, A. K. (2018). Emergency department boarding and adverse hospitalization outcomes among patients admitted to a general medical service. The American Journal of Emergency Medicine, 36(7), 1246-1248. doi:10.1016/j.ajem.2018.03.043Sørup, C. M., Jacobsen, P., & Forberg, J. L. (2013). Evaluation of emergency department performance – a systematic review on recommended performance and quality-in-care measures. 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Development and analysis of the Soil Water Infiltration Global database.
In this paper, we present and analyze a novel global database of soil infiltration measurements, the Soil Water Infiltration Global (SWIG) database. In total, 5023 infiltration curves were collected across all continents in the SWIG database. These data were either provided and quality checked by the scientists who performed the experiments or they were digitized from published articles. Data from 54 different countries were included in the database with major contributions from Iran, China, and the USA. In addition to its extensive geographical coverage, the collected infiltration curves cover research from 1976 to late 2017. Basic information on measurement location and method, soil properties, and land use was gathered along with the infiltration data, making the database valuable for the development of pedotransfer functions (PTFs) for estimating soil hydraulic properties, for the evaluation of infiltration measurement methods, and for developing and validating infiltration models. Soil textural information (clay, silt, and sand content) is available for 3842 out of 5023 infiltration measurements (~76%) covering nearly all soil USDA textural classes except for the sandy clay and silt classes. Information on land use is available for 76% of the experimental sites with agricultural land use as the dominant type (~40%). We are convinced that the SWIG database will allow for a better parameterization of the infiltration process in land surface models and for testing infiltration models. All collected data and related soil characteristics are provided online in *.xlsx and *.csv formats for reference, and we add a disclaimer that the database is for public domain use only and can be copied freely by referencing it. Supplementary data are available at https://doi.org/10.1594/PANGAEA.885492 (Rahmati et al., 2018). Data quality assessment is strongly advised prior to any use of this database. Finally, we would like to encourage scientists to extend and update the SWIG database by uploading new data to it
Helicometrina nimia Linton, 1910 (Digenea: Opecoelidae) in dusky grouper Epinephelus marginatus (Lowe, 1834) (Teleostei: Serranidae) from southeastern Brazil
Распределение бактериопланктона в Персидском заливе летом 2001 г.
Численность и пространственное распределение бактериопланктона были изучены в летний сезон 2001 г. в северной и центральной части Персидского залива. Выявлена пространственная неоднородность в распределении бактериопланктона изученной акватории, тогда как вертикальное распределение бактерий было равномерным вследствие отсутствия стратификации водной толщи.Bacterioplankton abundance, as well as spatial and vertical distribution covering several stations in the northern and central part of the Arabian Gulf were investigated during summer 2001. The results indicated a spatial variability in the bacterioplankton distribution within the study area, but no depth difference in abundance due to the well mixed nature of its waters
Robust gas recognition using adaptive thresholding
We propose a simple yet robust gas recognition technique that uses adaptive thresholding to convert the outputs of a sensor array into a unique digital code. Gas recognition is achieved by simply looking for a match within a library of digital codes. The proposed technique was successfully validated using in-house tin-oxide gas sensor arrays. Experimental results show that the proposed approach mitigates the effects of sensor drift, with correct detection rates of 87.86%, 90.72%, and 95% for carbon monoxide, propane, and ethanol, respectively. © 2011 IEEE
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