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A realistic topological p-n junction at the Bi2Se3 （0001） surface based on planar twin boundary defects

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Nano Research 2017年第5期10卷 1784-1793页

作者： Hugo Aramberri M. Carmen munoz Jorge I. Cerda Instituto de Ciencia de Materiales de Madrid (ICMM-CSIC) Cantoblanco Madrid 28049 Spain

We propose a realistic topological p-n junction （TPNJ） by matching two Bi2Se3 （0001） slabs with opposite arrangements of planar twin boundary defects. The atomistic modeling of such a device leads to dislocation defects in the hexagonal lattice in several quintuple layers. Nevertheless, total energy calculations reveal that the interface relaxes, yielding a smooth geometrical transition that preserves the nearest-neighbors fcc-type geometry throughout these defect layers. The electronic, magnetic, and transport properties of the junction have then been calculated at the ab initio level under open boundary conditions, i.e., employing a thin-film geometry that is infinite along the electron transport direction. Indeed, a p-n junction is obtained with a built-in potential as large as 350 meV. The calculations further reveal the spin texture across the interface with unprecedented detail. As the main result, we obtain non-negligible transmission probabilities around the F point, which involve an electron spin-flip process while crossing the interface.

关键词： topological insulators p-n junctions spintronics electronic devices twin boundaries

Hepatotoxicity associated with glucosamine and chondroitin sulfate in patients with chronic liver disease

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World Journal of Gastroenterology 2013年第32期19卷 5381-5384页

作者： cristian Cerda Miguel Bruguera Albert Parés Liver Unit Institute of Digestive and Metabolic DiseasesHospital Clínic Department of Medicine University of Barcelona

Glucosamine and chondroitin sulfate are molecules involved in the formation of articular cartilage and are frequently used for symptom relief in patients with *** molecules are well tolerated with scarce secondary *** few cases of possible hepatotoxicity due to these substances have been *** aim of this paper is to report the frequency of presumed glucosamine hepatotoxicity in patients with liver disease.A questionnaire was given to 151 consecutive patients with chronic liver disease of different etiology(mean age 59 years,56.9%women)attended in an outpatient clinic with the aim of evaluating the frequency of consumption of these drugs and determine whether their use coincided with a worsening in liver function test ***-three patients(15.2%)recognized having taken products containing glucosamine or chondroitin sulfate previously or at the time of the *** of the clinical records and liver function tests identified 2 patients presenting an elevation in aminotransferase values temporarily associated with glucosamine treatment;one of the cases simultaneously presented a skin rash attributed to the *** of these two patients and the cases described in the literature suggest toxicity of glucosamine and chondroitin *** clinical spectrum is variable,and the mechanism of toxicity is not clear but may involve reactions of *** consumption of products containing glucosamine and/or chondroitin sulfate is frequent among patients with chronic liver diseases and should be taken into account on the appearance of alterations in liver function tests not explained by the underlying disease.

关键词： Toxic hepatitis Hepatotoxicity Glucosamine Chondroitin sulphate Osteoarthritis

Actin levels fluctuate in the seminiferous epithelium at various stages during spermatogenesis in the rat

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BIOCELL 2017年第2期41卷 63-65页

作者： cristian ACOSTA MABEL FOSCOLO JUAN CARLOS CAVICCHIA Instituto de Histología y Embriología de Mendoza(IHEM)-CONICET Universidad Nacional de Cuyo5500MendozaArgentina

The testis is a double gland comprised of the sperm-producing seminiferous tubules and a complex endocrine *** former structures generate and release whole cells(exocrine aspect of the gland)while the latter synthesize and release androgens and related *** testis also has poorly understood paracrine *** connexions play an important role during spermatogenesis.A key molecule within these structures is β-***,the present study aims at examining the expression pattern of β-actin during the various stages of the spermatic cycle in the *** achieve this goal,we used a combination of trans-illumination assisted microdissection of seminiferous tubules,confocal immunofluorescence and Western blot *** experiments revealed that the levels of β-actin fluctuate significantly during spermatogenesis,peaking immediately after spermiation.

关键词： Beta actin Seminiferous epithelium Trans-illumination assisted microdissection

Maintaining flexibility in smart grid consumption through deep learning and deep reinforcement learning

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Energy and AI 2023年第3期13卷 137-148页

作者： Fernando Gallego cristian Martin Manuel Diaz Daniel Garrido ITIS Software Institute University of MalagaMalagaSpain

The smart grid concept is key to the energy revolution that has been taking place in recent *** Grids have been present in energy research since their ***,the scarcity of data from different energy sources,hardware power,or co-simulation environments has hindered their *** advances in multi-agent-based systems,the possibility of simulating the behavior of different energy sources,combining real building consumption,and simulated data,storage batteries and vehicle charging points,has opened *** development has resulted in much research published using both simulated and physical *** these investigations show that the main problem is that the machine learning algorithms do not fully match the real behavior,it is complex to use them to replicate the different actions to be *** paper aims to combine the approach of behavior prediction with state-of-the-art techniques,such as deep learning and deep reinforcement learning,to simulate unknown or critical system scenarios.A very important element in smart grids is the possibility of maintaining consumption within specific ranges(flexibility).For this purpose,we have made use of Tensorflow libraries that predict energy consumption and deep reinforcement learning to select the optimal actions to be performed in our *** developed platform is flexible enough to include new technologies such as smart batteries,electric vehicles,etc.,and it is oriented to real-time operation,being applied in an on-going real project such as the European ebalance-plus project.

关键词： Multi-agent based system Smart grid Distributed energy resources

Hidden Markov Models:Inverse Filtering,Belief Estimation and Privacy Protection

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Journal of Systems Science & Complexity 2021年第5期34卷 1801-1820页

作者： LOURENCO Ines MATTILA Robert ROJAS cristian R. HU Xiaoming WAHLBERG Bo Division of Decision and Control Systems School of Electrical Engineering and Computer ScienceKTH Royal Institute of TechnologyStockholmSweden Division of Optimizations and Systems Theory School of Engineering SciencesKTH Royal Institute of TechnologyStockholmSweden

A hidden Markov model(HMM)comprises a state with Markovian dynamics that can only be observed via noisy *** paper considers three problems connected to HMMs,namely,inverse filtering,belief estimation from actions,and privacy enforcement in such a ***,the authors discuss how HMM parameters and sensor measurements can be reconstructed from posterior distributions of an HMM ***,the authors consider a rational decision-maker that forms a private belief(posterior distribution)on the state of the world by filtering private *** authors show how to estimate such posterior distributions from observed optimal actions taken by the *** the setting of adversarial systems,the authors finally show how the decision-maker can protect its private belief by confusing the adversary using slightly sub-optimal *** range from financial portfolio investments to life science decision systems.

关键词： Belief estimation counter-adversarial systems hidden Markov models inverse decision making inverse filtering

Renal cancer:From current evidence to future perspectives

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Asian Journal of Urology 2022年第3期9卷 199-200,F0002页

作者： cristian Fiori Francesco Porpiglia Departmentof Oncology-Universityof Turin SanLuigi HospitalOrbassanoTurinItaly

It hasbeen agreat honortohave the opportunityto serve as guest editors for this issue of the Asian Journal of Urology(AJU)on renal *** cell carcinoma(RCC)represents about 3%of all adultmalignanciesand95%ofallrenalmassesanditisstill one of the most lethal urological cancers[1].In the last decades,diagnosis and management of Rcc have rapidly *** incidental diagnosis of small cancers has become more frequent due to the wideruse of imaging techniques,active surveillance and nephron-sparing surgical techniques mainly performed with minimally invasive approaches have become popular.

关键词： diagnosis Renal cancer

A longitudinal network analysis of social dynamics in rooks corvus frugilegus： repeated group modifications do not affect social network in captive rooks

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Current Zoology 2017年第5期63卷 379-388页

作者： Palmyre H. BOUCHERIE Sebastian SOSA cristian PASQUARETTA Valerie DUFOUR Institut Pluridisciplinaire Hubert Curien University of Strasbourg 23 rue Becquerel 67087 Strasbourg France Centre National de la Recherche Scientifique UMR 7178 67087 Strasbourg France Formerly affiliated with Grupo de Conducta Adaptativa e Interacci6n Psychology Faculty University of Barcelona 08035 Barcelona Spain

Numerous studies have investigated the remarkable variation of social features and the resulting structures across species. Indeed, relationships are dynamic and vary in time according to various factors such as environmental conditions or individuals attributes. However, few studies have investigated the processes that stabilize the structures within a given species, and the behavioral mechanisms that ensure their coherence and continuity across time. Here, we used a dynamic actor-based model, RSiena, to investigate the consistency of the temporal dynamic of relationships of a group of captive rooks facing recurrent modifications in group composition （i.e., the loss and introduction of individuals）. We found that changes in relationships （i.e., formation and removal） followed consistent patterns regardless of group composition and sex-ratio. Rooks preferentially interacted with paired congeners （i.e., unpopular attachment） and were more likely to form rela- tionships with individuals bonded to a current social partner （i.e., ＂friends of friends＂, or triadic closure）. The sex of individuals had no effect on the dynamic of relationships. This robust behav- ioral mechanisms formed the basis of inter-connected networks, composed of sub-structures of in- dividuals emerging from the enmeshment of dyadic and triadic motifs. Overall, the present study reveals crucial aspects of the behavioral mechanisms shaping rooks social structure, suggesting that rooks live in a well-integrated society, going far beyond the unique monogamous pair-bond.

关键词： corvids preferential attachment social interactions social network analysis temporal dynamics triadic closure.

Antibacterial and Antioxidant Activities of ZnO Nanoparticles Synthesized Using Extracts of Allium sativum,Rosmarinus officinalis and Ocimum basilicum

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Acta Metallurgica Sinica(English Letters) 2016年第3期29卷 228-236页

作者： Manuela Stan Adriana Popa Dana Toloman Teofil-Danut Silipas Dan cristian Vodnar National Institute for Research and Development of Isotopic and Molecular Technologies 67-103 Donat 400293Cluj-Napoca Romania Department of Food Science and Technology University of Agricultural Sciences and Veterinary Medicine 3-5 ManasturStreet 400372 Cluj-Napoca Romania

ZnO nanoparticles（ZnO NPs） were synthesized by chemical method（coprecipitation） and biological method using aqueous extracts of garlic（Allium sativum）,rosemary（Rosmarinus officinalis） and basil（Ocimum basilicum）.The influence of plant extract on the antibacterial and antioxidant activities of green synthesized nanoparticles was *** X-ray diffraction studies reveal that all ZnO samples have hexagonal wurtzite *** particle size of ZnO NPs estimated by transmission electron microscopy analysis（between 14 and 27 nm） varies depending on the synthesis method of nanoparticles and the type of extracts from the plants *** functional groups involved in the biosynthetic procedure were evidenced by Fourier transform infrared *** presence of Mn^（2＋）ions,Zn vacancy complexes and oxygen vacancies in ZnO samples was highlighted by electron paramagnetic resonance *** green synthesized ZnO NPs have shown a good bactericidal activity against Staphylococcus aureus,Bacillus subtilis,Listeria monocytogenes,Escherichia coli,Salmonella typhimurium and Pseudomonas aeruginosa bacterial *** NPs synthesized using extracts of the selected plant species have been found to exhibit more enhanced antibacterial and antioxidant activities as compared to chemical ZnO NPs.

关键词： Zinc oxide nanoparticles Antioxidant activity Antibacterial activity Green synthesis Plant extracts

Analyzing Real-Time Object Detection with YOLO Algorithm in Automotive Applications:A Review

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Computer Modeling in Engineering & Sciences 2024年第12期141卷 1939-1981页

作者： Carmen Gheorghe Mihai Duguleana Razvan Gabriel Boboc cristian Cezar Postelnicu Department of Automotive and Transport Engineering Transilvania University of BrasovBrasov500036Romania

Identifying objects in real-time is a technology that is developing rapidly and has a huge potential for expansion in many technical ***,systems that use image processing to detect objects are based on the information from a single frame.A video camera positioned in the analyzed area captures the image,monitoring in detail the changes that occur between *** You Only Look Once(YOLO)algorithm is a model for detecting objects in images,that is currently known for the accuracy of the data obtained and the fast-working *** study proposes a comprehensive literature review of YOLO research,as well as a bibliometric analysis to map the trends in the automotive field from 2020 to *** detection applications using YOLO were categorized into three primary domains:road traffic,autonomous vehicle development,and industrial settings.A detailed analysis was conducted for each domain,providing quantitative insights into existing *** the various YOLO architectures evaluated(v2–v8,H,X,R,C),YOLO v8 demonstrated superior performance with a mean Average Precision(mAP)of 0.99.

关键词： YOLO automotive autonomous vehicles traffic industry