bluuebunny/crossref_metadata_2025 huggingface dataset:
Experimentally testing quantum critical dynamics beyond the Kibble–Zurek mechanism
Authors: Cui Jin-Ming , Gómez-Ruiz Fernando Javier , Huang Yun-Feng , Li Chuan-Feng , Guo Guang-Can , del Campo Adolfo
Published: March 2020

The Kibble–Zurek mechanism (KZM) describes the dynamics across a phase transition leading to the formation of topological defects, such as vortices in superfluids and domain walls in spin systems. Here, we experimentally probe the distribution of kink pairs in a one-dimensional quantum Ising chain driven across the paramagnet-ferromagnet quantum phase transition, using a single trapped ion as a quantum simulator in momentum space. The number of kink pairs after the transition follows a Poisson binomial distribution, in which all cumulants scale with a universal power law as a function of the quench time in which the transition is crossed. We experimentally verified this scaling for the first cumulants and report deviations due to noise-induced dephasing of the trapped ion. Our results establish that the universal character of the critical dynamics can be extended beyond KZM, which accounts for the mean kink number, to characterize the full probability distribution of topological defects.
Momentum-transfer model of valence-band photoelectron diffraction
Authors: Schönhense G. , Medjanik K. , Babenkov S. , Vasilyev D. , Ellguth M. , Fedchenko O. , Chernov S. , Schönhense B. , Elmers H.-J.
Published: March 2020

Recent instrumental progress of valence-band photoemission in the X-ray range allows uncovering bulk- and surface-related electronic properties. Four-dimensional recording of energy and momentum-vector gives access to the complete spectral-density function. Systematic measurements for a number of transition metals between 15 eV-6 keV reveal unexpected strong intensity modulations due to photoelectron diffraction. Here, we present a graphical model that illustrates the role of momentum-conservation in Fermi’s Golden-Rule in an intuitive way. Intensity enhancement or reduction by factors >5 are confined to small energy- and momentum-intervals (widths 0.03 Å−1and 200 meV). Laue-type diffraction involves the photon momentum and is intrinsic in the photoemission process, in accordance with Pendry’s final-state-model. At higher energies, Kikuchi-diffraction imprints additional modulations on valence-band-patterns and quasi-elastic background. The absence of photon-momentum transfer uncovers the extrinsic nature of Kikuchi-diffraction. For Re at 30 K and 3.4 keV the relative weight of the Kikuchi-branch is comparable to the Laue-branch, whereas at 6 keV the Kikuchi-branch prevails.
Cellular memory enhances bacterial chemotactic navigation in rugged environments
Authors: Gosztolai Adam , Barahona Mauricio
Published: March 2020

The response of microbes to external signals is mediated by biochemical networks with intrinsic time scales. These time scales give rise to a memory that impacts cellular behaviour. Here we study theoretically the role of cellular memory in Escherichia coli chemotaxis. Using an agent-based model, we show that cells with memory navigating rugged chemoattractant landscapes can enhance their drift speed by extracting information from environmental correlations. Maximal advantage is achieved when the memory is comparable to the time scale of fluctuations as perceived during swimming. We derive an analytical approximation for the drift velocity in rugged landscapes that explains the enhanced velocity, and recovers standard Keller–Segel gradient-sensing results in the limits when memory and fluctuation time scales are well separated. Our numerics also show that cellular memory can induce bet-hedging at the population level resulting in long-lived, multi-modal distributions in heterogeneous landscapes.
The first crystallographically characterised ruthenium(vi) alkylimido porphyrin competent for aerobic epoxidation and hydrogen atom abstraction
Authors: Shing Ka-Pan , Wan Qingyun , Chang Xiao-Yong , Che Chi-Ming
Published: March 2020

The syntheses of [RuVI(Por)(NAd)(O)] and [RuVI(2,6-F2-TPP)(NAd)2] have been described. [RuVI(Por)(NAd)(O)] characterised by X-ray crystallography is competent for H-atom abstraction and aerobic alkene epoxidation.
Local structure and excitations in systems with CuF64− units: lack of Jahn–Teller effect in the low symmetry compound Na2CuF4
Authors: Sanchez-Movellan I. , Aramburu J. A. , Moreno M.
Published: March 2020

The lack of a Jahn–Teller effect in Na2CuF4 is illustrated by the anisotropy of the Na2ZnF4 parent lattice.
Transition metal complex/gold nanoparticle hybrid materials
Authors: Quintana Cristóbal , Cifuentes Marie P. , Humphrey Mark G.
Published: March 2020

Transition metal complex/gold nanoparticle hybrid applications in sensing are critiqued, and their potential in imaging, photo-dynamic therapy, nonlinear optics, and catalysis are assessed.
Antimony-doped tin oxide as an efficient electrocatalyst toward the VO2+/VO2+ redox couple of the vanadium redox flow battery
Authors: Lv Yang , Yang Chunmei , Wang Haining , Zhang Jin , Xiang Yan , Lu Shanfu
Published: March 2020

Enhanced electrocatalytic activity of ATO toward the VO2+/VO2+ redox reaction by adjusting electronic conductivity.
An MXene-based membrane for molecular separation
Authors: Li Jian , Li Xin , Van der Bruggen Bart
Published: March 2020

Two-dimensional (2D) materials with a nanoscale thickness are promising candidates for advanced molecular separations.
Effects of sulfide on mixotrophic denitrification by Thauera-dominated denitrifying sludge
Authors: Liang Zhensheng , Sun Jianliang , Zhan Chungeng , Wu Siting , Zhang Liang , Jiang Feng
Published: March 2020

Cultivation of Thauera-dominated denitrifying sludge can improve nitrate reduction with sulfide impacts, but nitrite accumulation should be considered when using sulfide as a complementary electron donor to treat wastewater with a low C/N ratio.
Isoliquiritigenin exerts antioxidative and anti-inflammatory effects via activating the KEAP-1/Nrf2 pathway and inhibiting the NF-κB and NLRP3 pathways in carrageenan-induced pleurisy
Authors: Gao Yun , Lv Xiaohong , Yang Huahong , Peng Liping , Ci Xinxin
Published: March 2020

Isoliquiritigenin exerts protective effects on carrageenan-induced pleurisy and lung injury. The underlying mechanisms may be nearly involved in Nrf2-mediated antioxidative activities and NLRP3/NF-κB-mediated anti-inflammatory activities.
Recent progress in selective estrogen receptor downregulators (SERDs) for the treatment of breast cancer
Authors: Shagufta  , Ahmad Irshad , Mathew Shimy , Rahman Sofia
Published: March 2020

This article reviews the current progress in the development of SERDs as anti-breast cancer agents.
Impact of electron transfer of atomic metals on adjacent graphyne layers on electrochemical water splitting
Authors: Gao Xiaoping , Mei Liang , Zhou Yanan , Shen Zhemin
Published: March 2020

Moderate electron transfer occurring on atomic metals of catalysts was found to be induced by atomic metals on adjacent graphyne layers and this accelerates electrocatalytic water splitting.
Shear-induced liquid-crystalline phase transition behaviour of colloidal solutions of hydroxyapatite nanorod composites
Authors: Kajiyama Satoshi , Iwase Hiroki , Nakayama Masanari , Ichikawa Rino , Yamaguchi Daisuke , Seto Hideki , Kato Takashi
Published: March 2020

The shear-induced structural changes and phase transition behaviour of colloidal hydroxyapatite-based nanorod composites are examined using in situ small-angle neutron scattering and rheological measurements.
Constructing heterostructured FeS2/CuS nanospheres as high rate performance lithium ion battery anodes
Authors: Xu Xiaoxia , Li Lingjie , Chen Huiqing , Guo XiaoSong , Zhang Zhonghua , Liu Jing , Mao Changming , Li Guicun
Published: March 2020

Heterostructured porous FeS2/CuS nanospheres exhibit enhanced reaction kinetics, excellent rate capability and desirable long-term cycling stability performance.
Highly-robust, solution-processed flexible transparent electrodes with a junction-free electrospun nanofiber network
Authors: Kim Geon Hwee , Woo Hyeonsu , Kim Suhyeon , An Taechang , Lim Geunbae
Published: March 2020

The flexible transparent electrode of this study used electrospinning and electroless deposition, which is a fabrication method to remove contact resistance at the nanofiber intersection and fabricate large-area electrode.
Effects of mixed agro-residues (corn crop waste) on lignin-degrading enzyme activities, growth, and quality ofLentinula edodes
Authors: Xu Shuai , Wang Fei , Fu Yongping , Li Dan , Sun Xiaozhong , Li Changtian , Song Bing , Li Yu
Published: March 2020

Using agro-residues in bioreactors to produce mushrooms is an important component of eco-agriculture.
Biomimetic mineralizable collagen hydrogels for dynamic bone matrix formation to promote osteogenesis
Authors: Chen Lu , Wu Chengheng , Chen Suping , Zhang Yusheng , Liu Amin , Ding Jie , Wei Dan , Guo Zhenzhen , Sun Jing , Fan Hongsong
Published: March 2020

Biomimetic mineralizable collagen hydrogels simulate the dynamic bone matrix mineralizing process via the synergy of cellular secretions, and form a microenvironment that promotes osteogenesis.
The synthesis and characterization of 3D mesoporous CeO2hollow spheres as a modifier for the simultaneous determination of amlodipine, hydrochlorothiazide and valsartan
Authors: Farvardin Najmeh , Jahani Shohreh , Kazemipour Maryam , Foroughi Mohammad Mehdi
Published: March 2020

Electrochemical sensor based on mesoporous CeO2hollow sphere modified glassy carbon electrode for simultaneous detecting amlodipine, hydrochlorothiazide and valsartan was fabricated.
Detection of CN−, Cu2+ and Zn2+ ions using a new chromone-based colorimetric chemosensor: half-adder and integrated circuits
Authors: Rezaeian Khatereh , Khanmohammadi Hamid , Talebbaigy Abolfazl
Published: March 2020

In this study, a new chromone-based azomethine chemosensorchemsensor, L, was designed, synthesized and characterized spectroscopically.
Visualization of carboxylesterase 2 with a near-infrared two-photon fluorescent probe and potential evaluation of its anticancer drug effects in an orthotopic colon carcinoma mice model
Authors: Wang Yan , Yu Feifei , Luo Xianzhu , Li Mingshun , Zhao Linlu , Yu Fabiao
Published: March 2020

We have established a near-infrared two-photon fluorescent probe for the detection of CE2 with high selectivity and sensitivity.
Stabilization of hydrogen peroxide by hydrogen bonding in the crystal structure of 2-aminobenzimidazole perhydrate
Authors: Churakov Andrei V. , Grishanov Dmitry A. , Medvedev Alexander G. , Mikhaylov Alexey A. , Vener Mikhail V. , Navasardyan Mger A. , Tripol'skaya Tatiana A. , Lev Ovadia , Prikhodchenko Petr V.
Published: March 2020

2-Aminobenzimidazole peroxosolvate – the third H2O2crystalline adduct stabilized with the maximum possible number of hydrogen bonds formed by one hydrogen peroxide molecule.
What is the preferred geometry of sulfur–disulfide interactions?
Authors: Veljković Ivana S. , Veljković Dušan Ž. , Sarić Gordana G. , Stanković Ivana M. , Zarić Snežana D.
Published: March 2020

Combined crystallographic and quantum chemical studies showed that in most cases, in crystal structures, interactions between sulphur atoms and disulphide bonds are bifurcated.
N-Doped cotton-based porous carbon/ZnO NR arrays: highly efficient hybrid photo-catalysts
Authors: Jiang Xiaoqing , Huang Linsen , Zhang Liangxing , Li Junhua , Sun Xiaosong
Published: March 2020

Biomass-based porous carbon/ZnO NR array hybrids are successfully synthesized, which show efficient charge carrier separation and extraordinary degradation capacity.
Upper limit to the photovoltaic efficiency of imperfect crystals from first principles
Authors: Kim Sunghyun , Márquez José A. , Unold Thomas , Walsh Aron
Published: March 2020

An approach is proposed to predict the impact of point defects on solar cell performance.
Strained lattice platinum–palladium alloy nanowires for efficient electrocatalysis
Authors: Ren Mengyun , Chang Fangfang , Miao Ruifang , He Xianhong , Yang Lin , Wang Xiaolei , Bai Zhengyu
Published: March 2020

The ability to manipulate Pt-based alloy catalysts with controllable compositions and the type of surface facet is important for advancing direct alcohol fuel cells (DAFEs).
Expeditious access of chromone analogues via a Michael addition-driven multicomponent reaction
Authors: Lei Jie , Li Yong , He Liu-Jun , Luo Ya-Fei , Tang Dian-Yong , Yan Wei , Lin Hui-Kuan , Li Hong-yu , Chen Zhong-Zhu , Xu Zhi-Gang
Published: March 2020

A Michael addition-driven four-component reaction (4-CR) with four Ugi inputs was developed and utilized for the synthesis of chromone derivatives and tetrazole substituted chromones under mild reaction conditions.
Unprecedent formation of methylsilylcarbonates from iridium-catalyzed reduction of CO2 with hydrosilanes
Authors: Guzmán Jefferson , García-Orduña Pilar , Lahoz Fernando J. , Fernández-Alvarez Francisco J.
Published: March 2020

The formation of methylsilylcarbonates from the iridium-catalyzed hydrosilylation of CO2 has been observed for the first time.
Synthesis of caffeic acid sulfonamide derivatives and their protective effect against H2O2 induced oxidative damage in A549 cells
Authors: Peng Xiaoyu , Hu Tingjun , Zhang Yuxue , Zhao Anran , Natarajan Bharathi , Wei Jiata , Yan Hao , Chen Hailan , Lin Cuiwu
Published: March 2020

Synthesized caffeic acid derivatives exhibit protective effect on H2O2 induced oxidative injury in A549 cells via Nrf2 pathway.
Metallo-supramolecular complexes from mPEG/PDPA diblock copolymers and their self-assembled strip nanosheets
Authors: Zhang Xiaoyu , Liu Yuyang , Wang Xin , Liang Yinxiu , Yan Lei
Published: March 2020

Copolymers mPEG(-b-Tpyp)2-b-PDPAx were synthesized. After a hierarchical pattern from the coordination of the copolymers with Ru(ii) ions followed by the self-assembly in water, 2D strip nanosheets were obtained.
Hydrolytic dehydrogenation of NH3BH3 catalyzed by ruthenium nanoparticles supported on magnesium–aluminum layered double-hydroxides
Authors: Qiu Xueying , Liu Jiaxi , Huang Pengru , Qiu Shujun , Weng Chaoming , Chu Hailiang , Zou Yongjin , Xiang Cuili , Xu Fen , Sun Lixian
Published: March 2020

Ru/MgAl-LDHs catalyst was successfully prepared, which exhibited higher catalytic activity and lower activation energy toward the hydrolysis of ammonia borane for hydrogen production.
Targeted and modular architectural polymers employing bioorthogonal chemistry for quantitative therapeutic delivery
Authors: Ediriweera Gayathri R. , Simpson Joshua D. , Fuchs Adrian V. , Venkatachalam Taracad K. , Van De Walle Matthias , Howard Christopher B. , Mahler Stephen M. , Blinco James P. , Fletcher Nicholas L. , Houston Zachary H. , Bell Craig A. , Thurecht Kristofer J.
Published: March 2020

There remain several key challenges to existing therapeutic systems for cancer therapy, such as quantitatively determining the true, tissue-specific drug release profile in vivo, as well as reducing side-effects for an increased standard of care.
Cucurbiturils brighten Au nanoclusters in water
Authors: Jiang Tao , Qu Guojuan , Wang Jie , Ma Xiang , Tian He
Published: March 2020

A host–guest self-assembly approach was developed to brighten Au22(FGGC)18 nanoclusters between CB[n] (n = 7, 8) and FGGC peptide in aqueous solutions.
Finding furoxan rings
Authors: Yu Qiong , Chinnam Ajay Kumar , Yin Ping , Imler Gregory H. , Parrish Damon A. , Shreeve Jean'ne M.
Published: March 2020

Dinitromethyl groups form an unstable nitrile oxide and its dipole isomer which cyclize to a furoxan ring.
Construction of supramolecular hydrogels using imidazolidinyl urea as hydrogen bonding reinforced factor
Authors: Yu Jing , Chen Xingxing , Yang Yuxuan , Zhao Xiaodan , Chen Xiaojing , Jing Tianhong , Zhou Yang , Xu Jiangping , Zhang Yanfeng , Cheng Yilong
Published: March 2020

A new hydrogen bonding reinforced factor was introduced into polymer design for the preparation of supramolecular hydrogels with advanced properties.
Field emission behaviors of CsPbI3 nanobelts
Authors: Du Zhentao , Jiang Fulin , Zheng Jinju , Chen Shanliang , Gao Fengmei , Teng Jie , Fu Dingfa , Zhang Hui , Yang Weiyou
Published: March 2020

We report the field emission behaviors of CsPbI3 nanobelts, which had a low turn-on field of ∼2.62 V μm−1 with a high field enhancement factor of 3553.
Memristors mimicking the regulation of synaptic plasticity and the refractory period in the phenomenological model
Authors: Yan Xiaobing , Wang Gong , Zhao Jianhui , Zhou Zhenyu , Wang Hong , Zhang Lei , Wang Jingjuan , Li Xiaoyan , Pei Yifei , Qin Cuiya , Zhao Qianlong , Xiao Zuoao , Wang Kaiyang , Li Hui , Chen Jingsheng
Published: March 2020

Herein, a new function in the phenomenological model, namely the principle of refractory period function, is developed based on a W/ZnO/FTO memristor device.
Efficiency analysis of photovoltaic systems
Authors: Golisz Ewa , Korpysz Krzysztof , Rutkowska Olga , Głowacki Szymon , Bryś Andrzej
Published: March 2020

The goal of the study was to analyse the efficiency of two existing photovoltaic micro-installations with the power of approx. 40 kWp. The main factor differing the two installations being analysed was the arrangement of modules in relation to the sides of the world, one is south-west and the other is east-west. The total yield of electrical energy in 2017 from the south-west installation was higher and amounted to 34980 kWh. For the east-west installation the amount of energy generated was equal to 31180 kWh. 4 methods of forecasting electrical energy yield were discussed. Simple computational method proved to be the best method for both installations.
Stochastic compartmental model of HIV-1 infection
Authors: Loginov Konstantin , Pertsev Nikolai
Published: March 2020

Stochastic model of the dynamics of HIV-1 infection describing the interaction of target cells and viral particles in the lymphatic nodes and their movement between the lymphatic nodes is constructed. The lymphatic system is represented as a graph, vertices of which are the lymphatic nodes and edges are the lymphatic vessels. The novelty of the model consists in the description of populations of cells and viral particles in terms of a multidimensional birth and death process with the random point-distributions. The random pointdistributions describe the duration of the transition of cells and viral particles between the lymph nodes and the duration of the stages of their development. The durations of transitions of viral particles and cells between the lymphatic nodes are not random and based on the rate of lymph flow. The durations of the developmental stages of infected target cells are assume to be constant. The graph theory for the formalization and compact representation of the model is used. An algorithm for modelling the dynamics of the studied populations is constructed basing on the Monte-Carlo method. The results of computational experiments for a system consisting of five lymphatic nodes are presented.
A model of chronic inflammation in atherosclerosis
Authors: Bezyaev Vladimir , Sadekov Nail , Volpert Vitaly
Published: March 2020

Atherosclerosis is a chronic progressive disease leading to the formation of atherosclerotic plaques in artery walls, narrowing its lumen. In this work, we present a mathematical model of atherosclerosis development for the concentrations of cells and cytokines of innate immunity. This system describes a chronic inflammatory response in the intima of an artery vessel wall. The stationary points and their stability for reduced kinetic systems of two and five ODEs are investigated. The relationship of the obtained results is analyzed, and their biological interpretation is given.
Squared quadratic Wasserstein distance: optimal couplings and Lions differentiability
Authors: Alfonsi Aurélien , Jourdain Benjamin
Published: March 2020

In this paper, we remark that any optimal coupling for the quadratic Wasserstein distanceW22(μ,ν) between two probability measuresμandνwith finite second order moments on ℝdis the composition of a martingale coupling with an optimal transport map 𝛵. We check the existence of an optimal coupling in which this map gives the unique optimal coupling betweenμand 𝛵#μ. Next, we give a direct proof thatσ↦W22(σ,ν) is differentiable atμin the Lions (Cours au Collège de France. 2008) sense iff there is a unique optimal coupling betweenμandνand this coupling is given by a map. It was known combining results by Ambrosio, Gigli and Savaré (Lectures in Mathematics ETH Zürich. Birkhäuser Verlag, Basel, 2005) and Ambrosio and Gangbo (Comm. Pure Appl. Math., 61:18–53, 2008) that, under the latter condition, geometric differentiability holds. Moreover, the two notions of differentiability are equivalent according to the recent paper of Gangbo and Tudorascu (J. Math. Pures Appl. 125:119–174, 2019). Besides, we give a self-contained probabilistic proof that mere Fréchet differentiability of a law invariant functionFonL2(Ω, ℙ; ℝd) is enough for the Fréchet differential atXto be a measurable function ofX.
Service-oriented performance of inventory models with partial information on unimodal demand lead-time distributions
Authors: Janssens Gerrit K. , Verdonck Lotte , Ramaekers Katrien
Published: March 2020

Facing uncertainty in demand, companies try to avoid stock-outs by holding safety inventories, depending on a pre-set customer service level. The knowledge of the demand distribution during lead-time serves to determine the safety inventory level. Many times the distribution is not fully known, except maybe for its range, mean or variance. However literature shows that the performance of holding safety stock strongly depends on the characteristics of the distribution. One option is to protect against the worst case distribution given some information like range or moments. But this worst case is a two-point distribution, bringing unbelief to managers that such an occurrence would ever appear. Mostly they share the opinion that the demand distribution is unimodal. This research develops a technique to derive the safety stock for unimodal demand distributions of which the mode either is known or can be estimated. In this way, the managers obtain solutions to the decision problem including a higher belief that the related type of distribution might appear in practice.
Apprentissage profond : un troisième oeil pour les praticiens
Authors: Fourcade A.
Published: March 2020

« L’intelligence artificielle connaît un essor fulgurant depuis ces dernières années. Lapprentissage automatique et plus précisément lapprentissage profond grâce aux réseaux de neurones convolutifs ont permis des avancées majeures dans le domaine de la reconnaissance des formes. Cette présentation fait suite à mon travail de thèse. La première partie retrace lhistorique et décrit les principes de fonctionnement de ces réseaux. La seconde présente une revue de la littérature de leurs applications dans la pratique médicale de plusieurs spécialités, pour des tâches diagnostiques nécessitant une démarche visuelle (classification dimages et détection de lésions). Quinze articles, évaluant les performances de ces solutions dautomatisation, ont été analysés. La troisième partie est une discussion à propos des perspectives et des limites présentées par les réseaux de neurones convolutifs, ainsi que leurs possibles applications en chirurgie orale. »
Le flux numérique en implantologie
Authors: Daas M. , Dada K.
Published: March 2020

L’optimisation du résultat esthétique et fonctionnel des restaurations implantaires, la simplification des procédures cliniques et de laboratoire et lamélioration de la prévisibilité des traitements sont les principaux objectifs de l’implantologie moderne.

Cette prévisibilité est due en grande partie à l’intégration du flux numérique dans les différents étapes du traitement: analyse esthétique virtuel « Digital Smile Design », meilleure communication avec les patients, prise en compte des paramètres biologiques, esthétiques et fonctionnels, prise dempreinte optique, numérisation des modèles, planification implantaire 3D, chirurgie guidée, optimisation du profil démergence avec les piliers anatomiques personnalisés, mise en place d’une restauration implanto-portée se rapprochant le plus possible des dents naturelles absentes, en se fondant dans son environnement tout en respectant la notion de «Biomimétique». Cette démarche permet donc aujourdhui d’anticiper le résultat de nos traitements, devenus de plus en plus complexes, et d’assurer la pérennité de nos restaurations implantaires à long terme.

Le but de notre intervention est de présenter l’intégration de ces nouvelles technologies dans notre pratique quotidienne, du cas simple au plus complexe.
Densité osseuse des crêtes prémaxillaires reconstituées par apposition d’os cortical membraneux et intérêt de la chirurgie implantaire guidée
Authors: Bayet K. , Philippe B.
Published: March 2020

Introduction : La procédure chirurgicale implantaire en présence d’os de densité hétérogène présente de réelles difficultés techniques en raison de la déviation des instruments de forage, de taraudage et d’insertion depuis l’os de densité é levée vers l’os de densité faible. L’objectif de cette communication consiste à valider la pertinence de la chirurgie guidée en présence de crêtes prémaxillaires reconstituées par apposition d’os autogène cortical membraneux en raison de l’importante différence de densité constatée entre le site receveur et le greffon.

Matériel et méthodes : Une étude rétrospective observationnelle est réalisée sur 20 scanners de cas cliniques ayant bénéficié d’appositions vestibulaires membraneuses (10 appositions d’os pariétal et 10 appositions d’os mandibulaire postérieur). L’ensemble des scanners ont été réalisés entre le 5eme et le 7eme mois post-opératoire (coupes axiales de 0,625mm espacées de 0,5mm. Scanner Low Dose GE Optima). Toutes les analyses de densité ont été réalisées à l’aide du logiciel SIMPLANT PRO 17 (Dentsplysirona).

Résultat : La densité osseuse moyenne observée au sein des greffes pariétales est de 1798,20 UH. Celle observée au sein des greffes mandibulaire postérieure est de 1956,80 UH. L’Os spongieux du site receveur maxillaire présente quant à lui une densité moyenne de 560 UH. Cette étude densitométrique confirme au prémaxillaire la différence de densité significative entre l’os greffé par apposition vestibulaire et l’os résiduel de la crête atrophiée (3.3 pour l’os pariétal et 3.4 pour l’os mandibulaire postérieur).

Discussion : Ces résultats confirment l’importante différence des densités au sein des crêtes fines reconstruites à l’aide d’os cortical membraneux. Compte-tenu des phénomènes provoqués de déviation des instruments de forage, de taraudage et d’insertion, la mise en place des implants doit être réalisée en chirurgie guidée afin d’assurer le contrôle exact de leur positionnement et de leur axe d’insertion.
Perspectives thérapeutiques du matrisome gingival dans la cicatrisation pathologique
Authors: Vo Quang Costantini S. , Petit S. , Nassif A. , Ferre F. , Fournier B.
Published: March 2020

Introduction : La muqueuse gingivale présente un potentiel de cicatrisation parmi les plus efficaces des tissus humains adultes. Le fibroblaste gingival joue un rôle primordial dans ces phénomènes de cicatrisation par ses interactions avec les éléments de la matrice extra-cellulaire (MEC). La peau, dont les capacités de cicatrisation sont moindres que la gencive, constitue un tissu de comparaison idéal pour étudier les phénomènes de cicatrisation. Ce travail propose de caractériser les différences entre gencive et peau à l’aide d’une cartographie des protéines de leur matrice extra-cellulaire respective et de leurs profils transcriptomiques. Matériels et méthodes : Les matrisomes et les profils d’expression génique (transcriptome) des fibroblastes gingivaux et dermiques ont été comparés après 14 jours de culture à confluence. Ces résultats ont été confirmés par l’analyse des bases de données publiques à l’aide d’outils bioinformatiques (GenePattern et GEO2R). Ils seront complétés par des modèles in vivo : deux prélèvements cutanés et gingivaux appariés chez trois souris saines (C57-Black 6) seront analysés comme précédemment. Résultats : Les résultats préliminaires montrent une surexpression des glycoprotéines dans la MEC des fibroblastes gingivaux. Ces dernières sont associées à la régulation de la synthèse collagéniques et élastiques. Ces résultats, confirmés par transcriptome, mettent en évidence une différence qualitative de la MEC synthétisée par ces deux types cellulaires. Discussion : Ces résultats montrent l’hétérogénéité du fibroblaste qui synthétise des MEC différentes en fonction de son origine tissulaire. Cette cartographie souligne la spécificité du tissu muqueux oral. Ces données préliminaires permettront d’identifier des protéines liées à la cicatrisation ad integrum de la muqueuse orale. Ces résultats pourraient ainsi orienter la fabrication de nouveaux supports en ingénierie tissulaire et présenter de nouvelles pistes thérapeutiques pour la cicatrisation cutanée pathologique
Tendances saisonnières des alvéolites et cellulites de la face en France : données du moteur de recherche Google Trends©
Authors: Hadj SaÏd M. , Campana F. , Ordioni U. , Lan R. , Chossegros C.M.
Published: March 2020

Introduction : Certaines pathologies présentent des tendances saisonnières dans leur incidence et leur prévalence. Ces tendances s’expriment par l’intérêt affiché dans le nombre de recherches sur Internet pour ces pathologies selon les mois de l’année. Matériel et Méthodes : Les données des requêtes de Google Trends© ont été extraites de décembre 2007 à décembre 2017. Celles-ci ont été traitées et calculées par volume trimestriel de recherche correspondant à chacune des quatre saisons sur cette période de 10 ans. Les données ont été isolées pour la région géographique spécifique correspondant à la France pour les termes de recherche suivants : « alvéolite », « cellulite de la face », « alvéolite dentaire », « cellulite dentaire » et « abcès dentaire ». Le même procédé a été réalisé pour les régions géographiques correspondant aux USA et à l’Australie avec les termes de recherche « alveolitis », « facial cellulitis », « dental alveolitis », « dental cellulitis », « dental abcess ». Les effets saisonniers ont été calculés à l’aide de modèles de régression. Résultats : En France, le volume de recherche est le plus élevé en hiver. Les patients manifestent le plus faible intérêt de recherche pour les cellulites et abcès dentaires pendant l’été (p <0,05). Les variations saisonnières sont comparables aux EZtats-Unis (hémisphère nord) alors qu’en Australie (hémisphère sud), elles présentent une tendance inverse. Les tendances de recherche pour l’alvéolite sont stables durant l’année (p <0,05). Conclusion : Au regard des données des requêtes de Google Trends, les cellulites de la face semblent plus susceptibles de se produire pendant les mois d’hiver, contrairement aux alvéolites qui n’ont pas de tendance saisonnière.
Neural network based model for global Total Electron Content forecasting
Authors: Cesaroni Claudio , Spogli Luca , Aragon-Angel Angela , Fiocca Michele , Dear Varuliator , De Franceschi Giorgiana , Romano Vincenzo
Published: March 2020

We introduce a novel empirical model to forecast, 24 h in advance, the Total Electron Content (TEC) at global scale. The technique leverages on the Global Ionospheric Map (GIM), provided by the International GNSS Service (IGS), and applies a nonlinear autoregressive neural network with external input (NARX) to selected GIM grid points for the 24 h single-point TEC forecasting, taking into account the actual and forecasted geomagnetic conditions. To extend the forecasting at a global scale, the technique makes use of the NeQuick2 Model fed by an effective sunspot number R12 (R12eff), estimated by minimizing the root mean square error (RMSE) between NARX output and NeQuick2 applied at the same GIM grid points. The novel approach is able to reproduce the features of the ionosphere especially during disturbed periods. The performance of the forecasting approach is extensively tested under different geospatial conditions, against both TEC maps products by UPC (Universitat Politècnica de Catalunya) and independent TEC data from Jason-3 spacecraft. The testing results are very satisfactory in terms of RMSE, as it has been found to range between 3 and 5 TECu. RMSE depend on the latitude sectors, time of the day, geomagnetic conditions, and provide a statistical estimation of the accuracy of the 24-h forecasting technique even over the oceans. The validation of the forecasting during five geomagnetic storms reveals that the model performance is not deteriorated during disturbed periods. This 24-h empirical approach is currently implemented on the Ionosphere Prediction Service (IPS), a prototype platform to support different classes of GNSS users.
Perkutane ultraschallgestützte Stanzbiopsie: Vergleich von 16- und 14-Gauge-Nadel und Einfluss der koaxialen Führung bei 1065 Brustbiopsien – Eine prospektive, randomisierte klinische Nichtunterlegenheitsstudie
Authors: Gruber Ines , Oberlechner Ernst , Heck Kerstin , Hoopmann Uta , Böer Bettina , Fugunt Regina , Gall Christian , Hartkopf Andreas D. , Helms Gisela , Hoffmann Sascha M. , Ott Claudia , Röhm Carmen , Stäbler Annette , Wallwiener Diethelm , Brucker Sara Y. , Hahn Markus
Published: March 2020

Ziel Die ultraschallgestützte Stanzbiopsie (CNB) gilt als Standardbewertung für die Diagnose sonografisch nachweisbarer verdächtiger Brustläsionen. Basierend auf nicht randomisierten Studien, empfehlen die aktuellen deutschen Leitlinien die Biopsie von mindestens 3 Zylindern mit ≤ 14-Gauge(G)-Nadel. Es wird jedoch keine Empfehlung abgegeben, wie viele Proben bei kleinerer Nadelstärke von z. B. 16-G benötigt werden oder ob die koaxiale Führung die diagnostische Genauigkeit (Treffsicherheit) und Qualität verbessert. Daher wurde in einer prospektiven, monozentrischen, nicht verblindeten, randomisierten, kontrollierten klinischen Nichtunterlegenheitsstudie die diagnostische Genauigkeit der Stanzbiopsie mit 16-G- versus 14-G-Nadel mit und ohne Koaxialführung bewertet.

Material und Methoden 1065 Brustbiopsien wurden aufgenommen, um die Zahl der erforderlichen Stanzproben zu analysieren, um eine entsprechende diagnostische Qualität zu erhalten, die für die histologische Beurteilung ausreicht, und um eine hohe diagnostische Genauigkeit und Ausbeute zu erreichen. Die histologischen Ergebnisse wurden durch eine Operation oder eine Langzeitbeobachtung von mindestens 2 bis zu 5 Jahren bestätigt.

Ergebnisse Um eine additive diagnostische Genauigkeit von > 99 % zu erreichen, waren mindestens 2 Zylinder mit 14-G-Biopsie erforderlich. Die diagnostische Genauigkeit und die Qualität der 14-G-Biopsie wurden durch die koaxiale Technik nicht beeinträchtigt. Bei der Durchführung einer 16-G-Biopsie waren 5 Zylinder erforderlich, um eine additive diagnostische Genauigkeit von > 99 % zu erreichen. Ohne koaxiale Führung benötigte die CNB mit 16-G mindestens 3 Proben, während 5 Nadelpassagen mit koaxialer 16-G-Biopsie erforderlich waren.

Schlussfolgerung Die diagnostische Genauigkeit und die Qualität der ultraschallgeführten Stanzbiopsie waren unabhängig vom Einsatz einer koaxialen Technik mit der 16-G-Nadel geringer als mit der 14-G-Nadel.
Post Circumcision Intraperitoneal Rupture of the Urinary Bladder: A Rare Complication
Authors: Abdelmaksoud Sherif , Albishbishy Mohammed , Elayyouti Mostafa , Zohiri Mohamed , Elsaied Adham
Published: March 2020

Circumcision is one of the most common pediatric surgical procedures performed all over the world and especially in Arab and Islamic countries. Many complications have been documented following this maneuver. We report on a rare case of intraperitoneal bladder rupture in a 7-day-old baby who was circumcised on his second day using the guillotine method. He presented to us with gangrene of the tip of the penis and a failure to void urine associated with progressive abdominal distension. Ultrasound revealed severe ascites. Aspiration and analysis confirmed the fluid to be urine. Ascending cystourethrogram was performed revealing a perforation of the posterior bladder wall near the trigone. Exploration was performed and repair done. Postoperative course was uneventful.
Cesarean Section for Placenta Previa and Placenta Previa Accreta Spectrum
Authors: Takeda Satoru , Takeda Jun , Makino Shintaro
Published: March 2020

According to the increase in the rate of cesarean section and the increase of high-aged pregnancy, we seem to more often encounter cases with placenta previa and placenta previa accrete spectrum. There are concerns about these cases, such as difficulty in controlling bleeding from the separation surface of placenta previa, the need for hysterectomy as a life-saving procedure, systemic management and hemostasis during massive hemorrhage, and treatment of disseminated intravascular coagulation (DIC). These cases are most frequently associated with cesarean hysterectomy.
Factors Influencing Graft Function following MPFL Reconstruction: A Dynamic Simulation Study
Authors: Tanaka Miho J. , Cosgarea Andrew J. , Forman Jared M. , Elias John J.
Published: March 2020

Medial patellofemoral ligament (MPFL) reconstruction is currently the primary surgical procedure for treating recurrent lateral patellar instability. The understanding of graft function has largely been based on studies performed with normal knees. The current study was performed to characterize graft function following MPFL reconstruction, focusing on the influence of pathologic anatomy on graft tension, variations with knee flexion, and the influence on patellar tracking. Knee squatting was simulated with 15 multibody dynamic simulation models representing knees being treated for recurrent lateral patellar instability. Squatting was simulated in a preoperative condition and following MPFL reconstruction with a hamstrings tendon graft set to allow 0.5 quadrants of lateral patellar translation with the knee at 30 degrees of flexion. Linear regressions were performed to relate maximum tension in the graft to parameters of knee anatomy. Repeated measures comparisons evaluated variations in patellar tracking at 5-degree increments of knee flexion. Maximum graft tension was significantly correlated with a parameter characterizing lateral position of the tibial tuberosity (maximum lateral tibial tuberosity to posterior cruciate ligament attachment distance, r
2 = 0.73, p < 0.001). No significant correlations were identified for parameters related to trochlear dysplasia (lateral trochlear inclination) or patella alta (Caton–Deschamps index and patellotrochlear index). Graft tension peaked at low flexion angles and was minimal by 30 degrees of flexion. MPFL reconstruction decreased lateral patellar shift (bisect offset index) compared with preoperative tracking at all flexion angles from 0 to 50 degrees of flexion, except 45 degrees. At 0 degrees, the average bisect offset index decreased from 0.81 for the preoperative condition to 0.71. The results indicate that tension within an MPFL graft increases with the lateral position of the tibial tuberosity. The graft tension peaks at low flexion angles and decreases lateral patellar maltracking. The factors that influence graft function following MPFL reconstruction need to be understood to limit patellar maltracking without overloading the graft or over constraining the patella.
Evolution of Surgical Management of Colorectal Liver Metastasis
Authors: Bekki Yuki , Bitner Daniel , Gunasekaran Ganesh
Published: March 2020

The treatment of colorectal liver metastasis (CRLM) has progressed markedly in the past decades. Main contributions stem from improvement in surgical approach and applications of chemotherapy. The availability of several perioperative and surgical techniques, including portal vein embolization, ablation techniques, and two-stage hepatectomies, has expanded surgical indications. In addition, preoperative imaging methods have contributed to these advances.

In patients with high oncological risk of recurrence, or initially unresectable CRLM, highly individualized treatment regimens are becoming more widely utilized. These patients should be evaluated for surgical resection after several cycles of chemotherapy given the survival benefit afforded by liver resection for CRLM. Several biomarkers, including RAS mutation, BRAF mutation, and microsatellite stability, have become essential in guiding therapy. Immunotherapy has recently been highlighted, especially for cases of microsatellite instability. Looking forward, biomarkers will likely to continue to guide individualized treatment patterns.

Liver transplantation as an option for patients with unresectable CRLM may boast comparable outcomes to patients with primary liver tumors, but it remains controversial considering the limited supply of donor livers.

Management of CRLM requires the complex decision making process common to contemporary tumor board discussions, and a multidisciplinary approach likely figures into future directions of management for CRLM.
Bi2Te3–CoFe2O4 nanocomposite: Role of magnetic filler on thermoelectric properties
Authors: Kumar Sunil , Munjal Sandeep , Khare Neeraj
Published: March 2020

The effect of magnetic CoFe2O4 (CFO) nanofillers on the thermoelectric properties of the Bi2Te3–CFO nanocomposite is investigated, and their role in the enhancement of thermoelectric properties is demonstrated. In the presence of a small magnetic field (25 mT), the electrical conductivity is enhanced by 16% and, simultaneously, the Seebeck coefficient is enhanced by 23%. The presence of CFO nanoparticles in the matrix of Bi2Te3 in the nanocomposite produces an interpenetrating network of the magnetically induced orientation of the magnetic moment of CFO, which results in the substantial reduction in the interface barrier by suppressing scattering of charge carriers at the interfaces. The simultaneous enhancement in the electrical conductivity and Seebeck coefficient in the presence of the small magnetic field resulted in an ∼52% enhancement of figure of merit for the Bi2Te3–CFO (4 wt. %) nanocomposite.
Discontinuous wrapping transition of spherical nanoparticles by tensionless lipid membranes
Authors: Spangler Eric J. , Laradji Mohamed
Published: March 2020

We present a numerical study of the wrapping of spherical nanoparticles by tensionless lipid membranes using molecular dynamics simulations of a coarse-grained implicit solvent model. We found that the degree of wrapping of small nanoparticles increases continuously with the adhesion strength for nanoparticles with diameter less than or about 15 nm. In contrast, the increase in the degree of wrapping becomes discontinuous for larger nanoparticles and exhibits a clear hysteresis when upward and downward annealing scans with respect to adhesion strength are performed. The gap in the degree of wrapping increases with the increase in the diameter of nanoparticles. These results are in qualitative agreement with the mean field prediction that large nanoparticles are either unbound or completely wrapped by tensionless lipid membranes.
High quality silicon: Colloidal quantum dot heterojunction based infrared photodetector
Authors: Xiao Xiongbin , Xu Kaimin , Yin Ming , Qiu Yu , Zhou Wenjia , Zheng Li , Cheng Xinhong , Yu Yuehui , Ning Zhijun
Published: March 2020

The integration of silicon (Si) and nanomaterials with infrared light harvesting capability is a promising approach to fabricate large area infrared light detecting arrays. However, the construction of a high quality junction between Si and small bandgap colloidal quantum dots (CQDs) remains a challenge, which limited their photodetecting performance in the short wavelength infrared region (1.4 μm–3 μm). Herein, a layer of solution processed ZnO nanoparticles was inserted between silicon and CQDs to passivate the surface dangling bond of silicon. This significantly reduces the carrier recombination between Si and CQDs. Meanwhile, the formation of the Si:CQD heterojunction structure enables effective carrier extraction. As a result, the photodetector shows the detecting range to the short wavelength infrared region (0.8 eV) and achieves a standard detectivity of 4.08 × 1011 Jones at a bias of −0.25 V at room temperature.
Field electron emission measurements as a complementary technique to assess carbon nanotube quality
Authors: Masteghin Mateus G. , Ahmad Muhammad , Tas Mehmet O. , Smith Christopher T. G. , Stolojan Vlad , Cox David C. , Silva S. Ravi P.
Published: March 2020

Carbon nanotubes (CNTs) can be used in many different applications. Field emission (FE) measurements were used together with Raman spectroscopy to show a correlation between the microstructure and field emission parameters. However, field emission characterization does not suffer from fluorescence noise present in Raman spectroscopy. In this study, Raman spectroscopy is used to characterize vertically aligned CNT forest samples based on their D/G band intensity ratio (ID/IG), and FE properties such as the threshold electric field, enhancement coefficient, and anode to CNT tip separation (ATS) at the outset of emission have been obtained. A relationship between ATS at first emission and the enhancement factor, and, subsequently, a relationship between ATS and the ID/IG are shown. Based on the findings, it is shown that a higher enhancement factor (∼3070) results when a lower ID/IG is present (0.45), with initial emissions at larger distances (∼47 μm). For the samples studied, the morphology of the CNT tips did not play an important role; therefore, the field enhancement factor (β) could be directly related to the carbon nanotube structural properties such as breaks in the lattice or amorphous carbon content. Thus, this work presents FE as a complementary tool to evaluate the quality of CNT samples, with the advantages of a larger probe size and an averaging over the whole nanotube length. Correspondingly, one can find the best field emitter CNT according to its ID/IG.
Pitfalls and prospects of optical spectroscopy to characterize perovskite-transport layer interfaces
Authors: Hutter Eline M. , Kirchartz Thomas , Ehrler Bruno , Cahen David , von Hauff Elizabeth
Published: March 2020

Perovskite photovoltaics has witnessed an unprecedented increase in power conversion efficiency over the last decade. The choice of transport layers, through which photo-generated electrons and holes are transported to electrodes, is a crucial factor for further improving both the device performance and stability. In this perspective, we critically examine the application of optical spectroscopy to characterize the quality of the transport layer-perovskite interface. We highlight the power of complementary studies that use both continuous wave and time-resolved photoluminescence to understand non-radiative losses and additional transient spectroscopies for characterizing the potential for loss-less carrier extraction at the solar cell interfaces. Based on this discussion, we make recommendations on how to extrapolate results from optical measurements to assess the quality of a transport layer and its impact on solar cell efficiency.
Nondestructive evaluation of structural adhesive bonding using the attenuation of zero-group-velocity Lamb modes
Authors: Hodé R. , Raetz S. , Blondeau J. , Chigarev N. , Cuvillier N. , Tournat V. , Ducousso M.
Published: March 2020

A laser ultrasonic method is proposed for the nondestructive evaluation (NDE) of structural adhesive bonding. Zero-group-velocity (ZGV) resonances were generated and detected in five trilayer assemblies composed of two asymmetric aluminum alloy plates bonded with an epoxy adhesive. Cohesive and adhesive defects were introduced to degrade the practical adhesion. The attenuation of the temporal signal of ZGV resonances was found to provide sufficient information to discriminate between strong and weak bonding. Two metrics characterizing the attenuation were identified, which allow us to quantitatively evaluate the differences between the manufactured samples. A 2D scan of a trilayer assembly with different bond defects demonstrates the imaging capability of this all-optical NDE method.