Room Temperature in Situ Growth of B/BO_<i>x</i> Nanowires and BO_<i>x</i> Nanotubes

Gonzalez-Martinez, Ignacio G.,Gorantla, Sandeep M.,Bachmatiuk, Alicja,Bezugly, Viktor,Zhao, Jiong,Gemming, Thomas,Kunstmann, Jens,Eckert, Jü,rgen,Cuniberti, Gianaurelio,Rü,mmeli, Mark H. American Chemical Society 2014 NANO LETTERS Vol.14 No.2

<P>Despite significant advances in the synthesis of nanostructures, our understanding of the growth mechanisms of nanowires and nanotubes grown from catalyst particles remains limited. In this study we demonstrate a straightforward route to grow coaxial amorphous B/BO<SUB><I>x</I></SUB> nanowires and BO<SUB><I>x</I></SUB> nanotubes using gold catalyst particles inside a transmission electron microscope at room temperature without the need of any specialized or expensive accessories. Exceedingly high growth rates (over 7 μm/min) are found for the coaxial nanowires, and this is attributed to the highly efficient diffusion of B species along the surface of a nanowire by electrostatic repulsion. On the other hand the O species are shown to be relevant to activate the gold catalysts, and this can occur through volatile O species. The technique could be further developed to study the growth of other nanostructures and holds promise for the room temperature growth of nanostructures as a whole.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2014/nalefd.2014.14.issue-2/nl404147r/production/images/medium/nl-2013-04147r_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl404147r'>ACS Electronic Supporting Info</A></P>

Role of Endoscopy in the Management of Boerhaave Syndrome

Juan Ignacio Tellechea,Jean-Michel Gonzalez,Pablo Miranda-García,Adrian Culetto,Xavier Benoit D’Journo,Pascal Alexandre Thomas,Marc Barthet 대한소화기내시경학회 2018 Clinical Endoscopy Vol.51 No.2

Boerhaave syndrome (BS) is a spontaneous esophageal perforation which carries high mortality. Surgical treatment is well established,but the development of interventional endoscopy has proposed new therapies. We expose our experience in a Gastrointestinal andEndoscopy Unit. With a retrospective, observational, open-label, single center, consecutive case series. All patients diagnosed withBS who were managed in our center were included. Treated conservatively, endoscopically or surgically, according to their clinicalcondition and lesion presentation. Fourteen patients were included. Ten were treated with primary surgery. One conservatively. In total,7/14 patients required an endoscopic treatment. All required metallic stents deployment, 3 cases over-the-scope-clips concomitantlyand one case a novel technique an internal drain. 6/7 cases endoscopically treated achieved complete esophageal healing. In conclusion,endoscopy is an useful tool at all stages BS management: difficult diagnosis, primary treatment in selected patients and as salvage whensurgery fails. With mortality rates and outcomes comparables to surgery.

Effect of implant- and occlusal load location on stress distribution in Locator attachments of mandibular overdenture. A finite element study

Angel Alvarez-Arenal,Ignacio Gonzalez-Gonzalez,Hector deLlanos-Lanchares,Elena Martin-Fernandez,Aritza Brizuela-Velasco,Joseba Ellacuria-Echebarria 대한치과보철학회 2017 The Journal of Advanced Prosthodontics Vol.9 No.5

PURPOSE. The aim of this study is to evaluate and compare the stress distribution in Locator attachments in mandibular two-implant overdentures according to implant locations and different loading conditions. MATERIALS AND METHODS. Four three-dimensional finite element models were created, simulating two osseointegrated implants in the mandible to support two Locator attachments and an overdenture. The models simulated an overdenture with implants located in the position of the level of lateral incisors, canines, second premolars, and crossed implant. A 150 N vertical unilateral and bilateral load was applied at different locations and 40 N was also applied when combined with anterior load at the midline. Data for von Mises stresses in the abutment (matrix) of the attachment and the plastic insert (patrix) of the attachment were produced numerically, color-coded, and compared between the models for attachments and loading conditions. RESULTS. Regardless of the load, the greatest stress values were recorded in the overdenture attachments with implants at lateral incisor locations. In all models and load conditions, the attachment abutment (matrix) withstood a much greater stress than the insert plastic (patrix). Regardless of the model, when a unilateral load was applied, the load side Locator attachments recorded a much higher stress compared to the contralateral side. However, with load bilateral posterior alone or combined at midline load, the stress distribution was more symmetrical. The stress is distributed primarily in the occlusal and lateral surface of the insert plastic patrix and threadless area of the abutment (matrix). CONCLUSION. The overdenture model with lateral incisor level implants is the worst design in terms of biomechanical environment for the attachment components. The bilateral load in general favors a more uniform stress distribution in both attachments compared to a much greater stress registered with unilateral load in the load side attachments. Regardless of the implant positions and the occlusal load application site, the stress transferred to the insert plastic is much lower than that registered in the abutment.

Effect of implant- and occlusal load location on stress distribution in Locator attachments of mandibular overdenture. A finite element study

Alvarez-Arenal, Angel,Gonzalez-Gonzalez, Ignacio,deLlanos-Lanchares, Hector,Martin-Fernandez, Elena,Brizuela-Velasco, Aritza,Ellacuria-Echebarria, Joseba The Korean Academy of Prosthodonitics 2017 The Journal of Advanced Prosthodontics Vol.9 No.5

PURPOSE. The aim of this study is to evaluate and compare the stress distribution in Locator attachments in mandibular two-implant overdentures according to implant locations and different loading conditions. MATERIALS AND METHODS. Four three-dimensional finite element models were created, simulating two osseointegrated implants in the mandible to support two Locator attachments and an overdenture. The models simulated an overdenture with implants located in the position of the level of lateral incisors, canines, second premolars, and crossed implant. A 150 N vertical unilateral and bilateral load was applied at different locations and 40 N was also applied when combined with anterior load at the midline. Data for von Mises stresses in the abutment (matrix) of the attachment and the plastic insert (patrix) of the attachment were produced numerically, color-coded, and compared between the models for attachments and loading conditions. RESULTS. Regardless of the load, the greatest stress values were recorded in the overdenture attachments with implants at lateral incisor locations. In all models and load conditions, the attachment abutment (matrix) withstood a much greater stress than the insert plastic (patrix). Regardless of the model, when a unilateral load was applied, the load side Locator attachments recorded a much higher stress compared to the contralateral side. However, with load bilateral posterior alone or combined at midline load, the stress distribution was more symmetrical. The stress is distributed primarily in the occlusal and lateral surface of the insert plastic patrix and threadless area of the abutment (matrix). CONCLUSION. The overdenture model with lateral incisor level implants is the worst design in terms of biomechanical environment for the attachment components. The bilateral load in general favors a more uniform stress distribution in both attachments compared to a much greater stress registered with unilateral load in the load side attachments. Regardless of the implant positions and the occlusal load application site, the stress transferred to the insert plastic is much lower than that registered in the abutment.

The selection criteria of temporary or permanent luting agents in implant-supported prostheses: in vitro study

Angel Alvarez-Arenal,Ignacio Gonzalez-Gonzalez,Hector deLlanos-Lanchares,Aritza Brizuela-Velasco,Joseba Ellacuria-Echebarria 대한치과보철학회 2016 The Journal of Advanced Prosthodontics Vol.8 No.2

PURPOSE The use of temporary or permanent cements in fixed implant-supported prostheses is under discussion. The objective was to compare the retentiveness of one temporary and two permanent cements after cyclic compressive loading. MATERIALS AND METHODS The working model was five solid abutments screwed to five implant analogs. Thirty Cr-Ni alloy copings were randomized and cemented to the abutments with one temporary (resin urethane-based) or two permanent (resin-modified glass ionomer, resin-composite) cements. The retention strength was measured twice: once after the copings were cemented and again after a compressive cyclic loading of 100 N at 0.72 Hz (100,000 cycles). RESULTS Before loading, the retention strength of resin composite was 75% higher than the resin-modified glass ionomer and 2.5 times higher than resin urethanebased cement. After loading, the retentiveness of the three cements decreased in a non-uniform manner. The greatest percentage of retention loss was shown by the temporary cement and the lowest by the permanent resin composite. However, the two permanent cements consistently show high retention values. CONCLUSION The higher the initial retention of each cement, the lower the percentage of retention loss after compressive cyclic loading. After loading, the resin urethane-based cement was the most favourable cement for retrieving the crowns and resin composite was the most favourable cement to keep them in place.

Room temperature single-step synthesis of metal decorated boron-rich nanowires via laser ablation

Mark H. Rummeli,Barbara Trzebicka,Gianaurelio Cuniberti,Thomas Gemming,Alicja Bachmatiuk,Ignacio G. Gonzalez-Martine 나노기술연구협의회 2019 Nano Convergence Vol.6 No.14

Hybrid nanostructures, such as those with nanoparticles anchored on the surface of nanowires, or decorated nanowires, have a large number of potential and tested applications such as: gas sensing, catalysis, plasmonic waveguides, supercapacitors and more. The downside of these nanostructures is their production. Generally, multi-step synthesis procedures are used, with the nanowires and the nanoparticles typically produced separately and then integrated. The few existent single-step methods are lengthy or necessitate highly dedicated setups. In this paper we report a single-step and rapid (ca. 1 min) laser ablation synthesis method which produces a wide variety of boron-rich decorated nanowires. Furthermore, the method is carried at room temperature. The synthesis process consists on a filamentary jet ejection process driven by pressure gradients generated by the ablation plume on the rims of the irradiation crater. Simultaneously nanoparticles are nucleated and deposited on the filaments thus producing hybrid decorated nanowires.

Graphene Coatings for the Mitigation of Electron Stimulated Desorption and Fullerene Cap Formation

Bachmatiuk, Alicja,Dianat, Arezoo,Ortmann, Frank,Quang, Huy Ta,Cichocka, Magdalena Ola,Gonzalez-Martinez, Ignacio,Fu, Lei,Rellinghaus, Bernd,Eckert, Joergen,Cuniberti, Gianaurelio,Rü,mmeli, Mark American Chemical Society 2014 Chemistry of materials Vol.26 No.17

<P>Graphene already has numerous applications in transmission electron microscopy. Here, we extend its application in electron microscopy by demonstrating its potential to stop electron induced desorption in nonconducting samples, where in essence charge build-up leads to surface atom desorption. Graphene films provide a conduction pathway to prevent charge build-up and do not interfere with the imaging process allowing the direct imaging of specimens sensitive to electron induced desorption. We also show that small graphene flakes on the surface of MgO transform to fullerenes or hemispherical fullerenes. The hemispherical fullerenes anchor to the MgO surface and are of particular interest as they suggest it should be possible to nucleate single walled carbon nanotubes on the surface of oxide supports without the need of a catalyst particle.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/cmatex/2014/cmatex.2014.26.issue-17/cm502043x/production/images/medium/cm-2014-02043x_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/cm502043x'>ACS Electronic Supporting Info</A></P>

Quantum Machine Learning Applied to Electronic Healthcare Records for Ischemic Heart Disease Classification

Maheshwari Danyal,Ullah Ubaid,Marulanda Pablo A. Osorio,Jurado Alain García-Olea,Gonzalez Ignacio Diez,Merodio Jose M. Ormaetxe,Garcia-Zapirain Begonya 한국컴퓨터산업협회 2023 Human-centric Computing and Information Sciences Vol.13 No.-

Cardiovascular diseases refer to diseases that affect the heart and blood arteries. Most strategies developed to predict ischemic heart disease (IHD) are focused on pain characteristics, age, and sex, but many variables have been described as determinant risk factors for developing IHD. Therefore, machine learning algorithms are essential to make efficient decisions in predicting cardiac disease in the healthcare industry by considering a lot of medical data. Recent research has focused on implementing these approaches to quantum machine learning (QML) algorithms. This research proposes a set of computationally efficient QML algorithms, optimized quantum support vector machine (OQSVM), and hybrid quantum multi-layer perceptron (HQMLP) for the classification of cardiovascular disease. The use of efficient pre-processing and the robust feature selection techniques, i.e., Wrapper and Filter method improves the prediction rate and ensures the robustness of the proposed models. All the models are evaluated using the real-time cardiovascular dataset and recorded the performance in terms of accuracy. The performance metrics of the proposed models are compared to those of recently published models with more complicated architectures. The highest accuracies of the proposed OQSVM, and HQMLP models, considering 10 features of the cardiovascular dataset, are recorded at 94% and 93%, respectively. Furthermore, the proposed models are computationally effective and can be preferred for real-time healthcare applications.