331 research outputs found
Cerebrovascular assessment for the risk prediction of Alzheimer’s disease.
No full textCerebrovascular Assessment for the Risk Prediction of Alzheimer's Disease.
Silvestrini M, Viticchi G, Altamura C, Luzzi S, Balucani C, Vernieri F.
Neurological Clinic, Marche Polytechnic University, Ancona, Italy.
Increasing evidence is emerging that vascular disease and its risk factors play a
role in the development of Alzheimer's disease (AD) and affect the probability of
an adverse outcome. The aims of this review are to explore the relationship
between vascular risk factors and AD and to discuss the potential use of vascular
markers in the clinical approach to cognitive impairment. Moreover, we present
evidence about the potential use of ultrasonographic and neuroradiologic markers
of cognitive impairment in order to establish possible treatment strategies in
subjects with a clinical profile at risk of developing AD
Dose influence on the PMMA e-resist for the development of high-aspect ratio and reproducible sub-micrometric structures by electron beam lithography
No full textIn this work, a statistical process control method is presented showing the accuracy and the reliability obtained with of PMMA E-resist AR-P 672, using an Elphy Quantum Electron Beam Lithography module integrated on a FE-SEM Zeiss Auriga instrument. Reproducible nanostructures with an high aspect ratio between e-resist thickness and width of written geometric structure are shown. Detailed investigation of geometry features are investigated with dimension in the range of 200nm to 1-m. The adopted method will show how tuning the Area Dose factor and the PMMA thickness it was possible to determine the correct and reproducible parameters that allows to obtain well defined electron-beam features with a 4:1 aspect ratio. Such high aspect ratio opens the possibility to realize an electron-beam lithography lift-off process by using a standard e-beam resist. © 2016 Author(s)
Cerebral hemodynamics and cognitive performances in bilateral asymptomatic carotid stenosis.
No full textCerebral hemodynamics and cognitive performance in bilateral asymptomatic carotid
stenosis.
Balucani C, Viticchi G, Falsetti L, Silvestrini M.
From the Department of Neurology (C.B.), University of Perugia, Perugia, Italy;
Department of Neurology and Stroke Center (C.B.), SUNY Downstate Medical Center,
Brooklyn, NY; Neurological Clinic (G.V., M.S.), Marche Polytechnic University,
Ancona; and Internal and Subintensive Medicine (L.F.), Ospedali Riuniti, Ancona,
Italy.
OBJECTIVES: To evaluate cognitive performance in subjects with bilateral
asymptomatic carotid stenosis (B-ACS) compared to subjects with unilateral ACS
and to subjects with no carotid stenosis (CS) and to explore the relationship
between cognitive performance and cerebral hemodynamics status in B-ACS. METHODS:
The neuropsychological investigation included phonemic (ph) and categorical (ca)
Verbal Fluency (VF) tests for exploring the left brain functions and Colored
Progressive Matrices (CPM) and Complex Figure Copy Test (CFCT) for the right
brain. Cerebral hemodynamics status was assessed using the transcranial
Doppler-based breath-holding index test. RESULTS: A total of 333 subjects were
included: 127 B-ACS, 73/77 left/right unilateral ACS, 56 no CS, mean age 70 ±
3.78 years, 65% male. Subjects with B-ACS and subjects with unilateral ACS showed
significantly lower scores in all cognitive tests compared to subjects with no CS
(p < 0.05). Subjects with B-ACS with left impaired hemodynamics status showed a
significantly reduced ph-VF score, from 13.4 (95% confidence interval [CI]
11.2-15.8) to 7.5 (95% CI 5.4-9.7), and a reduced ca-VF score, from 19.7 (95% CI
18.1-24.1) to 10.8 (95% CI 9.5-15.1), compared to subjects with no CS. Similarly,
impaired cerebral hemodynamics in the right side was associated with a
significantly reduced CPM score, from an estimated mean of 34.2 (95% CI
29.8-35.4) to 24.6 (95% CI 20.2-25.8), and CFCT score from 37.0 (95% CI
32.0-37.4) to 27.1 (95% CI 23.3-28.7). All comparisons were p < 0.05. CONCLUSION:
Subjects with B-ACS and subjects with unilateral ACS are more likely to have
cognitive dysfunction compared to subjects with no CS. There appears to be a link
between cognitive dysfunction and hemodynamics impairment due to carotid
stenosis
Realization of 3D silicon structures using a DRIE technique
No full text3D manufacturing at micron scale with very low roughness is a key enabling technology for the realization of micromechanical parts both for mechanical devices and for critical components such as printer head nozzles and high precision molds. The only currently available technique in the field of IC micro technology is nanolithography by two photon absorption [1]. We report the implementation of a technique based on multiple Deep Reactive Ion Ecthing (DRIE) [2] that allows to realize complex 3D geometries in silicon with a limited number of lithographic steps. A mold is demonstrated with 1/30 aspect ratio, 6 depth levels, including wafer-through features, with a dimensional accuracy of 5um
Porous silicon solar cells
No full textWe developed a new process for the fabrication of crystalline solar cell, based on an ultrathin silicon membrane, taking advantage of porous silicon technology. The suggested architecture allows the costs reduction of silicon based solar cell reusing the same wafer to produce a great number of membranes. The architectures combines the efficiency of crystalline silicon solar cell, with the great absorption of porous silicon, and with a more efficient way to use the material. The new process faces the main challenge to achieve an effective and not expensive passivation of the porous silicon surface, in order to achieve an efficient photovoltaic device. At the same time the process suggests a smart way to selective doping of the macroporous silicon layers despite the through-going pores. © 2015 IEEE.
SciVal Topic Prominence
Topic: Porous silicon | Silicon | macroporous silicon
Prominence percentile: 66.984
Author keywords
nanofabricationporous siliconsilicon nanoelectronicssolar cells
Indexed keywords
Engineering controlled terms:
Crystalline materialsNanoelectronicsNanostructured materialsNanotechnologyPorous siliconSiliconSilicon wafersSolar cells
Engineering uncontrolled terms
Crystalline silicon solar cellsCrystalline solar cellsMacro porous siliconPhotovoltaic devicesPorous silicon surfacesPorous silicon technologySilicon nanoelectronicsUltrathin silicon membrane
Engineering main heading:
Silicon solar cells
ISBN: 978-146738155-0
Source Type: Conference Proceeding
Original language: English
DOI: 10.1109/NANO.2015.7388710
Document Type: Conference Paper
Sponsors: Nanotechnology Council
Publisher: Institute of Electrical and Electronics Engineers Inc.
References (9)
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1
(2012) International Technology Roadmap for Photovoltaics Results 2012. Cited 24 times.
ITRPV, Third Edition, Berlin 2012
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Lehmann, V., Honlein, W., Stengl, R., Willer, J., Wendt, H.
(1992) Verfahren Zur Herstellung Einer Solarzelle Aus Einer Substratscheibe. Cited 6 times.
German patent DE4204455C1; Filing date: 29. 01.
3
Brendel, R., Ernst, M.
Macroporous Si as an absorber for thin-film solar cells
(2010) Physica Status Solidi - Rapid Research Letters, 4 (1-2), pp. 40-42. Cited 22 times.
http://www3.interscience.wiley.com/cgi-bin/fulltext/123215552/PDFSTART
doi: 10.1002/pssr.200903372
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4
Ernst, M., Brendel, R., Ferré, R., Harder, N.-P.
Thin macroporous silicon heterojunction solar cells
(2012) Physica Status Solidi - Rapid Research Letters, 6 (5), pp. 187-189. Cited 16 times.
doi: 10.1002/pssr.201206113
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5
Ernst, M., Brendel, R.
Macroporous silicon solar cells with an epitaxial emitter
(2013) IEEE Journal of Photovoltaics, 3 (2), art. no. 6472253, pp. 723-729. Cited 7 times.
doi: 10.1109/JPHOTOV.2013.2247094
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6
Ernst, M., Schulte-Huxel, H., Niepelt, R., Kajari-Schröder, S., Brendel, R.
Thin crystalline macroporous silicon solar cells with ion implanted emitter (Open Access)
(2013) Energy Procedia, 38, pp. 910-918. Cited 2 times.
http://www.sciencedirect.com/science/journal/18766102
doi: 10.1016/j.egypro.2013.07.364
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7
Nenzi, P., Kholostov, K., Crescenzi, R., Bondarenka, H., Bondarenko, V., Balucani, M.
Electrochemically etched TSV for porous silicon interposer technologies
(2013) Proceedings - Electronic Components and Technology Conference, art. no. 6575887, pp. 2201-2207. Cited 2 times.
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doi: 10.1109/ECTC.2013.6575887
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8
Perticaroli, S., Varlamava, V., Palma, F.
Microwave sensing of nanostructured semiconductor surfaces
(2014) Applied Physics Letters, 104 (1), art. no. 013110. Cited 3 times.
doi: 10.1063/1.4861424
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9
De Cesare, G., Caputo, D., Tucci, M.
Electrical properties of ITO/crystalline-silicon contact at different deposition temperatures
(2012) IEEE Electron Device Letters, 33 (3), art. no. 6142006, pp. 327-329. Cited 28 times.
doi: 10.1109/LED.2011.2180356
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RELX Group
We developed a new process for the fabrication of crystalline solar cell, based on an ultrathin silicon membrane, taking advantage of porous silicon technology. The suggested architecture allows the costs reduction of silicon based solar cell reusing the same wafer to produce a great number of membranes. The architectures combines the efficiency of crystalline silicon solar cell, with the great absorption of porous silicon, and with a more efficient way to use the material. The new process faces the main challenge to achieve an effective and not expensive passivation of the porous silicon surface, in order to achieve an efficient photovoltaic device. At the same time the process suggests a smart way to selective doping of the macroporous silicon layers despite the through-going pores
Visible Photoluminescence of Zinc Oxide Films Electrochemically Deposited on Silicon Substrates
No full textContinuous crystalline films of zinc oxide (ZnO) with thicknesses of 6-10 mu m were obtained by electrochemical deposition from aqueous zinc nitrate solutions on silicon substrates with a buffer nickel layer. X-ray diffraction measurements showed that the polycrystalline films possess a hexagonal crystal lattice with predominant (0002) orientation. The obtained ZnO films exhibit strong photoluminescence in the visible spectral range at room temperature
Electroplated contacts and porous silicon for silicon based solar cells applications
No full textIn this paper, a two-layer metallization for silicon based solar cells is presented. The metallization consists of thin nickel barrier and thick copper conductive layers, both obtained by electrodeposition technique suitable for phosphorus-doped 70–90 Ohm/sq solar cell emitter formed on p-type silicon sub- strate. To ensure the adhesion between metal contact and emitter a very thin layer of mesoporous silicon is introduced on the emitter surface before metal deposition. This approach allows metal anchoring inside pores and improves silicon–nickel interface uniformity. Optimization of metal contact parameters is achieved varying the anodization and electrodeposition conditions. Characterization of contacts between metal and emitter is carried out by scanning electron microscopy, specific contact resistance and current–voltage measurements. Mechanical strength of nickel–copper contacts is evaluated by the peel test. Adhesion strength of more than 4.5 N/mm and contact resistance of 350 Ohm cm2 on 80 Ohm/sq emitter are achieved
MEMS-based conjugate surfaces flexure hinge
No full textThis paper presents a new concept flexure hinge for MEMS applications and reveals how to design, construct, and experimentally test. This hinge combines a curved beam, as a flexible element, and a pair of conjugate surfaces, whose contact depends on load conditions. The geometry is conceived in such a way that minimum stress conditions are maintained within the flexible beam. A comparison of the new design with the other kind of revolute and flexible joints is presented. Then, the static behavior of the hinge is analyzed by means of a theoretical approach, based on continuum mechanics, and the results are compared to those obtained by means of finite element analysis (FEA) simulation. A silicon hinge prototype is also presented and the construction process, based on single step lithography and reactive ion etching (RIE) technology, is discussed. Finally, a crucial in-SEM experiment is performed and the experimental results are interpreted through the theoretical models
New approach for the monolithic integration of silicon photonics, integrated circuits and solar cell
No full text- …
