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Lateral Stability Analysis for Composite Plate Girder Bridges
Pavlos Thanopoulos,Stella Louverdi,Andreas Spiliopoulos,Ioannis Vayas 한국강구조학회 2021 International Journal of Steel Structures Vol.21 No.2
The methods that are currently available in the Eurocodes for the design of bridge plate girders to lateral torsional buckling are outlined and discussed. The inapplicability of the classic elastic critical moment theory for deep girders, which are common in bridge practice, is demonstrated. The simplifi ed method of the equivalent fl ange in compression is applied instead, and its results are compared with those of specialised software which can accurately predict the elastic critical load of bridge girders. These widely accepted methods of design are compared to a previously published truss model which has been proposed for the simplifi ed, yet accurate, modelling of bridge plate girders. The results of both the critical load and the design load according to the Eurocodes are compared. For the truss model, the general method for the calculation of the design load is used. A variety of cross-sectional dimensions, lateral restraints and bridge confi gurations is examined. Emphasis is given in a two-span, two-girder steel concrete composite bridge with various bracing confi gurations, where many aspects of lateral torsional buckling design can be demonstrated. The advantages of the use of a 3D truss model from practicing engineers are discussed.
Innovative Dissipative (INERD) Pin Connections for Seismic Resistant Braced Fram
Ioannis Vayas,Pavlos Thanopoulos 한국강구조학회 2005 International Journal of Steel Structures Vol.5 No.5
Innovative dissipative (INERD) conections were developed for seismic resistant braced frames. The dissipative zones indeveloped: pin connections and U-shape connections. This paper presents studies on the pin conections, where the braces areconnected to their adjacent members by means of eye-bars and a pin runing through them. Experimental and theoreticalinvestigations show a high energy dissipation capacity of these connections that is due to the inelastic bending action of thepin. The susceptibility to brittle fracture or low-cycle fatigue is low as inelastic action takes place away from welds or stressadvantages provide a promise for a wide application of the invented connections for buildings and enginering structures inseismic regions.
Syntaxonomy and Synecology of Quercus coccifera Mediterranean Shrublands in Greece
Georgios Tsiourlis,Pavlos Konstantinidis,Pantelis Xofis 한국식물학회 2009 Journal of Plant Biology Vol.52 No.5
Quercus coccifera (kermes oak) is the most common species of the Mediterranean maquis with a wide distribution across the Mediterranean Basin. This paper presents a syntaxonomic overview of the Q. coccifera plant communities in the Mediterranean zone of Greece (Quercetea ilicis) based on the classification of 221 relevés from 34 (17 continental and 17 insular) mountainous areas throughout Greece. Two associations and eight subassociations are described and presented in a synoptic constancy table. Querco cocciferae–Pistacietum lentisci is the most widespread, is found in the entire continental Greece and most islands, and is further subdivided into five sub-associations reflecting primarily local peculiarities in the disturbance regime and the influence of local floristic elements. Rhamno lycioidis–Cocciferetum (Rivas Goday & Rivas-Martínez 1954), on the other hand, is geographically confined on the island of Crete and is further subdivided into three sub-associations, reflecting differences in the annual precipitation, and they are characterized by the presence of many phryganic and grazing-resistant species. Climate and the anthropogenic pressure have been identified to be the most important factors determining the structure and the floristic composition of Q. coccifera Mediterranean shrublands of Greece.
Chios Mastic Gum Consumption Has a Protective Effect on Ovariectomy-Induced Bone Loss in Rats
Angeliki Eirini Pepe,Pavlos Lelovas,Vasiliki K. Pachi,Maria Halabalaki,Antonis Galanos,Panagiota Mikou,Dimitrios Pitidis Poutos,George Papadomichelakis,Stavros Kourkoulis,Ermioni Pasiou,Sofia Mitakou 한국식품영양과학회 2021 Preventive Nutrition and Food Science Vol.26 No.2
The purpose of this study was to examine the potential effect of Chios Mastic Gum (CMG) consumption on bone mineral density (BMD) and strength of ovariectomized rats. CMG is a known resin used from ancient times for its beneficial biological properties. Thirty mature female Wistar rats were randomized into three equal groups: sham-operated (control), ovariectomized (OVX), and ovariectomized and administered CMG per os (OVX+CMG). BMD of the total tibia, proximal tibia, and the 6th lumbar vertebra were measured at baseline and at 3 and 6 months post ovariectomy. Bone strength was assessed with three-point-bending (3pb) of the right femur. At 3 and 6 months, BMD values of the OVX+CMG group were significantly higher for the anatomical cites evaluated than those of the OVX group. Femoral thickness assessed via 3pb had intermediate values in the treated group compared to the other groups. Cytology of vaginal smears and uterine weight of the OVX+CMG group were consistent with estrogen depletion. Gastrocnemius muscle and intraperitoneal fat ratios to body weight (BW) of the OVX+CMG group did not significantly differ from the control group. Daily consumption CMG had a protective effect on BMD of the total and proximal tibia and the 6th lumbar vertebra of the rats, without causing undesirable effects on the vaginal epithelium and uterus. The 3pb results also demonstrated a favorable effect on the thickness of rat femurs. In addition, CMG was beneficial for both the muscular system and the intraperitoneal fat/BW ratio of the rats.
Detrending time series for astronomical variability surveys
Kim, Dae-Won,Protopapas, Pavlos,Alcock, Charles,Byun, Yong-Ik,Bianco, Federica B. Blackwell Publishing Ltd 2009 Monthly notices of the Royal Astronomical Society Vol.397 No.1
<P>ABSTRACT</P><P>We present a detrending algorithm for the removal of trends in time series. Trends in time series could be caused by various systematic and random noise sources such as cloud passages, changes of airmass, telescope vibration, CCD noise or defects of photometry. Those trends undermine the intrinsic signals of stars and should be removed. We determine the trends from subsets of stars that are highly correlated among themselves. These subsets are selected based on a hierarchical tree clustering algorithm. A bottom-up merging algorithm based on the departure from normal distribution in the correlation is developed to identify subsets, which we call clusters. After identification of clusters, we determine a trend per cluster by weighted sum of normalized light curves. We then use quadratic programming to detrend all individual light curves based on these determined trends. Experimental results with synthetic light curves containing artificial trends and events are presented. Results from other detrending methods are also compared. The developed algorithm can be applied to time series for trend removal in both narrow and wide field astronomy.</P>
The First Cases of Sudden Sensorineural Hearing Loss Post Coronavirus Disease in Children
Chrysouli Konstantina,Savva Ioannis Pavlos,Karamagkiolas Sotirios 대한청각학회 2024 Journal of Audiology & Otology Vol.28 No.1
To investigate the incidence, characteristics, diagnosis, treatment, and prognosis of coronavirus disease (COVID-19)-related sudden sensorineural hearing loss (SSNHL) in children, three cases of SSNHL after COVID-19 infection in children were analyzed. ENT clinical examination of all cases was normal. Only the third child had a first degree left-beating optokinetic nystagmus, compatible with right peripheral vestibulopathy. The audiogram indicated unilateral severe SSNHL in all frequencies. Computed tomography and magnetic resonance imaging of the brain and temporal bones also showed absence of pathology of the related structures. Oral methylprednisolone was administered to the first two cases, whereas intravenous methylprednisolone in a tapering form was administered to the third case. Additionally, the children underwent intratympanic dexamethasone injections and hyperbaric oxygen therapy with hearing improvement in lower and middle frequencies. The prognosis of COVID-19-related SSNHL in children is closely related to the onset of treatment. The combination of glucocorticoids, intratympanic dexamethasone injections, and hyperbaric oxygen therapy could be effective for COVID- 19-related SSNHL in children. Further large-scale, multicenter studies should be conducted to investigate the pathophysiology, diagnosis, treatment, and prognosis of COVID- 19-related SSNHL.
Kim, Dae-Won,Protopapas, Pavlos,Byun, Yong-Ik,Alcock, Charles,Khardon, Roni,Trichas, Markos IOP Publishing 2011 The Astrophysical journal Vol.735 No.2
<P>We present a new quasi-stellar object (QSO) selection algorithm using a Support Vector Machine, a supervised classification method, on a set of extracted time series features including period, amplitude, color, and autocorrelation value. We train a model that separates QSOs from variable stars, non-variable stars, and microlensing events using 58 known QSOs, 1629 variable stars, and 4288 non-variables in the MAssive Compact Halo Object (MACHO) database as a training set. To estimate the efficiency and the accuracy of the model, we perform a cross-validation test using the training set. The test shows that the model correctly identifies similar to 80% of known QSOs with a 25% false-positive rate. The majority of the false positives are Be stars. We applied the trained model to the MACHO Large Magellanic Cloud (LMC) data set, which consists of 40 million light curves, and found 1620 QSO candidates. During the selection none of the 33,242 known MACHO variables were misclassified as QSO candidates. In order to estimate the true false-positive rate, we crossmatched the candidates with astronomical catalogs including the Spitzer Surveying the Agents of a Galaxy's Evolution LMC catalog and a few X-ray catalogs. The results further suggest that the majority of the candidates, more than 70%, are QSOs.</P>
Alexandrina S. Nikova,Maria-Valeria Karakasi,Pavlos Pavlidis,Theodossios Birbilis,Ivaylo Dimitrov 대한신경손상학회 2019 Korean Journal of Neurotrauma Vol.15 No.2
Objective: Penetrating brain trauma (PBT) caused by gunshot is one of the most lethaltraumatic brain injuries (TBIs) and its management and confrontation is of great importance. Methods: The authors searched retrospectively the archives from 2 similar autonomouslaboratories of forensic science and toxicology in the Balkan peninsula for a 10-year period oftime and included only fatal penetrating brain injuries. Results: The study is conducted in 61 cadavers with gunshot PBT. All of the cadavers werevictims of suicide attempt. The most common anatomical localization on the skull were thefacial bones, followed by skull base, temporal and parietal bone, conducting a trajectoryof the gunshot. Additional findings were atherosclerosis of the blood vessels and chronicdiseases such as chronic obstructive pulmonary disease, cancer and fatty liver. Conclusion: PBI has a high mortality rate. There are factors and findings from the collecteddata differing between the 2 aforementioned nations. Either way, better preventativemeasures, gun control and healthcare system are highly necessary.