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New Linkage with Linear Actuator for Tracking PV Systems with Large Angular Stroke

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Chinese Journal of Mechanical Engineering 2011年第5期24卷 744-751页

作者： VISA Ion DIACONESCU Dorin SAULESCU Radu VATASESCU Monica BURDUHOS bogdan Renewable Energy Systems and Recycling Research Centre Transilvania University of Brasov

This paper focuses on the development of an optimized photovoltaic tracking system involving low-cost, relative simple mechanisms, with linear actuators able to insure strokes comparable with those resulted when using gear rotary actuators. Starting with a rhombus linkage, with a linear actuator on the diagonal used for the elevation motion till 90°, a new performance solution is generated. This new linkage allows large angular strokes by using an asymmetric rhombus and an eccentrically positioned linear actuator. The paper can be divided in three main parts. Firstly the kinematical modeling of the new linkage is addressed, which permits the establishing of the linkage dimensions according to two adjustable parameters （k2, k5）. Using the resulted correlations, in the second part the linkage synthesis algorithm is developed; the steps followed in this algorithm are presented in a numerical application considering a tracked PV platform, where the azimuthal vertical movement is obtained with the new proposed rhomboidal linkage. In the last part of the paper an analysis is done with the aim of determining the PV platform tracking efficiency （which represents the ratio between the received and the available beam solar energy） using the new linkage, in the meteorological conditions of Brasov, Romania implementation site.

关键词： solar tracking linkage linear actuator angular stroke transmission angle

New statistical results on the optical IDV data of BL Lac S5 0716+714

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Research in Astronomy and Astrophysics 2015年第3期15卷 327-332页

作者： bogdan Dǎnilǎ Alexandru Marcu Gabriela Raluca Mocanu Faculty of Physics Babes-Bolyai University Romanian Academy Astronomical Institute Astronomical Observatory Cluj-Napoca

This paper reports on the statistical behavior of the optical Intraday Variability of BL Lac S5 0716＋714. Available Intraday Variability data in the opti- cal are tested to see whether or not the magnitude is lognormally distributed. Our results consistently indicate that this is not the case. This is in agreement with a previ- ous discussion about data for the same object but in a different observational period. Simultaneously, the spectral slope of the light curves is calculated. The implications of these findings on models that describe both the location and source of Intraday Variability are presented.

关键词： radiation mechanisms non-thermal -- BL Lacertae objects individual:S5 0716+714

Cooling rate effects on the structure and transformation behavior of Cu-Zn-Al shape memory alloys

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International Journal of Minerals,Metallurgy and Materials 2014年第11期21卷 1109-1114页

作者： Nicoleta-Monica Lohan Marius-Gabriel Suru bogdan Pricop Leandru-Gheorghe Bujoreanu Faculty of Materials Science and Engineering The "Gheorghe Asachi" Technical UniversityIasi Bd. D. Mangeron 61A 700050 Iasi Romania

Different fragments of a hot-rolled and homogenized Cu–Zn–Al shape memory alloy（SMA） were subjected to thermal cycling by means of a differential scanning calorimetric（DSC） device. During thermal cycling, heating was performed at the same constant rate of increasing temperature while cooling was carried out at different rates of decreasing temperature. For each cooling rate, the temperature decreased in the same thermal interval. During each cooling stage, an exothermic peak（maximum） was observed on the DSC thermogram. This peak was associated with forward martensitic transformation. The DSC thermograms were analyzed with PROTEUS software： the critical martensitic transformation start（Ms） and finish（Mf） temperatures were determined by means of integral and tangent methods, and the dissipated heat was evaluated by the area between the corresponding maximum plot and a sigmoid baseline. The effects of the increase in cooling rate, assessed from a calorimetric viewpoint, consisted in the augmentation of the exothermic peak and the delay of direct martensitic transformation. The latter had the tendency to move to lower critical transformation temperatures. The martensite plates changed in morphology by becoming more oriented and by an augmenting in surface relief, which corresponded with the increase in cooling rate as observed by scanning electron microscopy（SEM） and atomic force microscopy（AFM）.

关键词： copper alloys shape memory effect microstructure phase transformations martensite cooling rate differential scanning calo-rimetry

Disaster Awareness and Preparedness Among Older Adults in Canada Regarding Floods, Wildfires, and Earthquakes

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International Journal of Disaster Risk Science 2024年第2期15卷 198-212页

作者： Evalyna bogdan Rachel Krueger Julie Wright Kyle Woods Shaieree Cottar School of Administrative Studies Disaster and Emergency Management ProgramYork UniversityTorontoOntario M3J 1P3Canada Department of Geography and Environmental Management University of WaterlooWaterlooOntario N2L 3G1Canada Partners for Action Faculty of EnvironmentUniversity of WaterlooWaterlooOntario N2L 3G1Canada

Older adults are significantly impacted by natural hazards and disasters that are exacerbated by climate change. Understanding their awareness and preparedness is essential for enhancing disaster resilience. This study investigated the attitudes, actions, and recommendations of older adults regarding natural hazards that pose risks in their geographic area—specifically floods, wildfires, and/or earthquakes in Canada. Methods for this study included survey and focus groups with older adults(n = 161 and n = 10, respectively) and other high-risk groups from across Canada, that are vulnerable to these natural hazards. The main findings from this study are that current awareness and preparedness among older adults is low, though stronger perceptions of risks are associated with risks specific to geographic locations where respondents live. Several barriers, such as hazard vulnerability misperceptions, cost-related reasons, and lack of hazard awareness have resulted in low awareness and preparedness among these populations. The two main recommendations arising from this research are:(1) improve awareness and preparedness with tailor-made emergency preparedness materials for older adults;and(2) adopt community-based approaches to disaster preparedness through existing community groups to strengthen social connections with a focus on locally specific hazards. The findings from this research can be applied to other hazards, including heatwaves and pandemics.

关键词： Canada Community-based disaster risk management Disaster awareness and preparedness Disaster resilience Natural hazards Older adults

New Advances in Biostratigraphy of the Lower/Middle Norian Transition:Conodonts of the Dov?ko Section,Slovenia

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Journal of Earth Science 2021年第3期32卷 677-699页

作者： Viktor Karadi Tea Kolar-Jurkovsek Luka Gale bogdan Jurkovsek Department of Palaeontology Eotvos Lorand UniversityBudapest 1117Hungary Geological Survey of Slovenia Ljubljana 1000Slovenia Department of Geology University of LjubljanaLjubljana 1000Slovenia Kamnica 27 1262 Doipri LjubljaniSlovenia

This study presents the results of the conodont biostratigraphy and microfacies analysis carried out on the pelagic limestones of the Upper Triassic Dov?ko Section in Slovenia,which represents the eastern part of the Slovenian *** age of the section ranges from the Lacian 1 to the Alaunian *** Lacian part of the succession is predominantly characterized by the representatives of the genus *** morphologies towards Alaunian faunas first appear in the Lacian 3 and become common during the Lacian-Alaunian *** evolutionary development coincides with a shift in microfacies from a dominantly radiolarian-bearing mudstone-wackestone-packstone to a filament-dominated wackestone-packstone,and the formation of small neptunian dykes,which may reflect environmental perturbations and/or a change in basin *** proliferation of the genera Epigondolella and Mockina is observed in the Alaunian part of the section,though the genus Ancyrogondolella is still present in this *** description of the conodont taxa is provided,and seven new species and two new subspecies are *** new advances will be of great value in further biostratigraphic studies,especially in areas without ammonoid faunas,and in the reconstruction of the paleogeography of the Slovenian Basin.

关键词： conodonts microfacies Late Triassic Norian Lacian Alaunian Slovenian Basin cherty limestone

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Deep Feature Extraction and Feature Fusion for Bi-Temporal Satellite Image Classification

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Computers, Materials & Continua 2021年第1期66卷 373-388页

作者： Anju Asokan bogdan Patrut Dana Danciulescu D.Jude Hemanth Department of ECE Karunya Institute of Technology and SciencesCoimbatoreIndia Department of Computer Science Alexandru Ioan Cuza University of la?ila?iRomania Department of Computer Science University of CraiovoCraiovoRomania

Multispectral images contain a large amount of spatial and spectral data which are effective in identifying change *** feature extraction is important for multispectral image classification and is evolving as an interesting research area in change ***,many deep learning framework based approaches do not consider both spatial and textural details into *** order to handle this issue,a Convolutional Neural Network(CNN)based multi-feature extraction and fusion is introduced which considers both spatial and textural *** method uses CNN to extract the spatio-spectral features from individual channels and fuse them with the textural *** the fused image is classified into change and unchanged *** presence of mixed pixels in the bitemporal satellite images affect the classification accuracy due to the misclassification *** proposed method was compared with six state-of-theart change detection methods and *** main highlight of this method is that by taking into account the spatio-spectral and textural information in the input channels,the mixed pixel problem is *** indicate the effectiveness of this method and demonstrate that it possesses low misclassification errors,higher overall accuracy and kappa coefficient.

关键词： Remote sensing convolutional neural network deep learning multispectral bitemporal change detection

Open anterior glenohumeral dislocation with associated supraspinatus avulsion: A case report

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World Journal of Clinical Cases 2019年第7期7卷 849-854页

作者： Cosmin Ioan Faur bogdan Anglitoiu Ana-Maria Ungureanu 2~(nd) Department of Orthopaedics and Traumatology University of Medicine and Pharmacy "Victor Babes" Department of Radiology and Medical Imaging University of Medicine and Pharmacy "Victor Babes"

BACKGROUND Open dislocation of the glenohumeral joint is a very rare complication with only six cases described in the literature. Most cases resulted in severe complications like avascular necrosis of the humeral head or septic arthritis with poor functional results. The "mandatory" treatment of choice is surgery, with accurate debridement and reconstruction of the damaged soft tissues. However, the results in these cases do not approach those seen in classical *** SUMMARY This case report is the first description of an anterior open glenohumeral dislocation without associated fractures, but with complete avulsion of the soft tissue envelope of the proximal humerus. Surgical treatment consisted of copious lavage with saline solution, meticulous debridement of the nonviable soft tissues,reduction of the dislocated humeral head and reconstruction of the soft tissue envelope of the humeral head. The selected surgical approach was an inferior extension of the wound at the level of the delto-pectoral groove, as the best choice to be able to perform an adequate debridement and capsulo-tendinous reinsertion. At 6 mo there were no clinical signs of instability of the glenohumeral joint, the functionality of the joint was restricted to 90o of anterior elevation,internal rotation to L2, with severe limitation of abduction(60o) and external rotation(0o) but without residual pain, with an Oxford shoulder Score of *** Thorough reconstruction of the soft tissues surrounding the shoulder joint and an early rehabilitation program are key points to a good functional result.

关键词： Open shoulder dislocation Case report Functional impairment Surgical treatment Avascular necrosis

A Comparative Analysis of Binary Logistic Regression and Analytical Hierarchy Process for Landslide Susceptibility Assessment in the Dobrovǎt River Basin,Romania

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Pedosphere 2016年第3期26卷 335-350页

作者： Cristian V.PATRICHE Radu PIRNAU Adrian GROZAVU bogdan ROSCA Romanian Academy Department of IasiGeography Group "Alexandru Ioan Cuza" University of Iasi Faculty of Geography

A correct assessment of the landslide susceptibility component is extremely useful for the diminution of associated potential risks to local economic development, particularly in regard to land use planning and soil conservation. The purpose of the present study was to compare the usefulness of two methods, i.e., binary logistic regression(BLR) and analytical hierarchy process(AHP), for the assessment of landslide susceptibility over a 130-km^2 area in the Moldavian Plateau(eastern Romania) region, where landslides affect large areas and render them unsuitable for agriculture. A large scale inventory mapping of all types of landslides(covering 13.7% of the total area) was performed using orthophoto images, topographical maps, and field surveys. A geographic information system database was created, comprising the nine potential factors considered as most relevant for the landsliding process. Five factors(altitude, slope angle, slope aspect, surface lithology, and land use) were further selected for analysis through the application of a tolerance test and the stepwise filtering procedure of BLR. For each predictor, a corresponding raster layer was built and a dense grid of equally spaced points was generated, with an approximately equal number of points inside and outside the landslide area, in order to extract the values of the predictors from raster layers. Approximately half of the total number of points was used for model computation, while the other half was used for validation. Analytical hierarchy process was employed to derive factor weights, with several pair-wise comparison matrices being tested for this purpose. The class weights, on a scale of 0 to 1, were taken as normalized landslide densities. A comparison of results achieved through these two approaches showed that BLR was better suited for mapping landslide susceptibility, with 82.8% of the landslide area falling into the high and very high susceptibility classes. The susceptibility class separation u

关键词： Moldavian Plateau multivariate statistical method predictor weights receiver operating characteristic curve semiqualitative method

Access control and surveillance in a smart home

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High-Confidence Computing 2022年第1期2卷 38-46页

作者： Cristina Stolojescu-Crisan Calin Crisan bogdan-Petru Butunoi Department of Communications Politehnica University of TimisoaraTimisoaraRomania SafeFleet Telematics TimisoaraRomania Department of Computer Science West University of TimisoaraTimișoaraRomania

In the past years smart homes solutions have become more and more popular with the introduction of a high number of both Internet of Things(IoT)applications and smart *** automation and security systems market is in a continuous growth,traditional security systems are evolving fast,and more and more people choose Smart home *** this paper,we propose two IoT based systems in the context of Smart homes:qToggle for multiple home automation,and MotionEyeOS,a video surveillance OS for single-board *** qToggle devices are based on ESP8266/ESP8285 chips or on Raspberry Pi boards and smart sensors,while MotionEye uses Raspberry Pi boards.

关键词： Access control Internet of things Security Smart homes Video surveillance