cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Acetylcholine prioritises direct synaptic inputs from entorhinal cortex to CA1 by differential modulation of feedforward inhibitory circuits.
Creators: name: Palacios-Filardo, Jon
name: Udakis, Matt
name: Brown, Giles A
name: Tehan, Benjamin G
name: Congreve, Miles S
name: Nathan, Pradeep J
name: Brown, Alastair JH
name: Mellor, Jack R
Publisher: name: Apollo - University of Cambridge Repository
Year: 2021

description: Funder: Biotechnology and Biological Sciences Research Council
description: Acetylcholine release in the hippocampus plays a central role in the formation of new memory representations. An influential but largely untested theory proposes that memory formation requires acetylcholine to enhance responses in CA1 to new sensory information from entorhinal cortex whilst depressing inputs from previously encoded representations in CA3. Here, we show that excitatory inputs from entorhinal cortex and CA3 are depressed equally by synaptic release of acetylcholine in CA1. However, feedforward inhibition from entorhinal cortex exhibits greater depression than CA3 resulting in a selective enhancement of excitatory-inhibitory balance and CA1 activation by entorhinal inputs. Entorhinal and CA3 pathways engage different feedforward interneuron subpopulations and cholinergic modulation of presynaptic function is mediated differentially by muscarinic M3 and M4 receptors, respectively. Thus, our data support a role and mechanisms for acetylcholine to prioritise novel information inputs to CA1 during memory formation.
UV/IR mixing in noncommutative QED defined by Seiberg-Witten map
Creators: name: Schupp, Peter
name: You, Jiangyang
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Noncommutative gauge theories defined via Seiberg-Witten map have desirable properties that theories defined directly in terms of noncommutative fields lack, covariance and unrestricted choice of gauge group and charge being among them, but nonperturbative results in the deformation parameter θare hard to obtain. In this article we use a θ-exact approach to study UV/IR mixing in a noncommutative quantum electrodynamics (NCQED) model defined via Seiberg-Witten map. The fermion contribution of the one loop correction to the photon propagator is computed and it is found that it gives the same UV/IR mixing term as a NCQED model without Seiberg-Witten map.
description: 12 pages
Performance investigation of a modified small engine fueled with producer gas
Creators: name: Nakorn Tippayawong
name: Nigran Homdoung
name: Natthawud Dussadee
Publisher: name: Maejo University
Year: 2015
Subjects: small engine,producer gas,compression ratio,spark ignition,renewable energy

description: 1, 9, Maejo International Journal of Science and Technology
Fostering Consensus in Multidimensional Continuous Opinion Dynamics under Bounded Confidence
Creators: name: Lorenz, Jan
Publisher: name: arXiv
Year: 2007
Subjects: subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences

description: Social consensus is important for society. Sometimes the success of society depends on a consensus (e.g. the decision to pay taxes or to commit to the constitution). Examples for continuous opinion dynamics are discussions about tax rates or budget plan proposals for governments investments. Another example is a commission of experts which should reach a estimate about a certain issue, e.g. the tax revenues of the next year. In all these situations we got a group of agents which should reach a common agreement either for reaching a good approximation to the truth but on the other hand for the reason, that reaching consensus is a good in itself. From social judgment theory and experiments we know that humans either tend to agreement with others for normative and informational reasons but on the other hand have bounded confidence against others with differing opinions. In a framework of models of continuous opinion dynamics we ask, which structural conditions foster the achievement of consensus? We present evidence by simulation that bringing more issues in does, but only if the issues are under budget constraints. Further, the installation of meetings where everyone hears all opinions has a better impact than relying on gossip.
description: 14 pages, 6 figures, first presented at Conference "Potentials of Complexity Science for Business, Governments, and the Media" 04/08/2006 Budapest
Aromaticity of a series of poly-2,7-[N]calicenes
Creators: name: Thawalrat Ratanadachanakin
name: Collier, Willard E.
Publisher: name: Maejo University
Year: 2015
Subjects: polycalicenes,aromaticity,nucleus independent chemical shift,B3LYP

description: 1, 9, Maejo International Journal of Science and Technology
Critical adsorption on non-spherical colloidal particles
Creators: name: Kondrat, S.
name: Harnau, L.
name: Dietrich, S.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We consider a non-spherical colloidal particle immersed in a fluid close to its critical point. The temperature dependence of the corresponding order parameter profile is calculated explicitly. We perform a systematic expansion of the order parameter profile in powers of the local curvatures of the surface of the colloidal particle. This curvature expansion reduces to the short distance expansion of the order parameter profile in the case that the solvent is at the critical composition.
description: 9 pages, 7 figures
Enhanced visible light absorption in layered Cs3Bi2Br9 through mixed-valence Sn(ii)/Sn(iv) doping
Creators: name: Krajewska, Chantalle J
name: Kavanagh, Seán R
name: Zhang, Lina
name: Kubicki, Dominik J
name: Dey, Krishanu
name: Gałkowski, Krzysztof
name: Grey, Clare
name: Stranks, Samuel
name: Walsh, Aron
name: Scanlon, David O
name: Palgrave, Robert G
Publisher: name: Apollo - University of Cambridge Repository
Year: 2021

description: Mixed valence Sn doping of Cs3Bi2Br9 leads to broad visible light absorption.
Biohydrogen Production from Xylose by Aanaerobic Mixed Cultures in Elephant Dung
Creators: name: Khanittha FIALA, Maturos PHABJANDA
Publisher: name: Walailak University
Year: 2015
Subjects: Hydrogen production, xylose, elephant dung, anaerobic fermentation

description: 3, 12, Walailak Journal of Science and Technology
Generation of a Soluble Form of Human Endoglin Fused to Green Fluorescent Protein.
Creators: name: Ruiz-Llorente, Lidia
name: Vega, M Cristina
name: Fernández, Francisco J
name: Langa, Carmen
name: Morrell, Nicholas
name: Upton, Paul
name: Bernabeu, Carmelo
Publisher: name: Apollo - University of Cambridge Repository
Year: 2021
Subjects: endoglin
GFP
soluble endoglin
fusion protein
recombinant protein
fluorescence
BMP
TGF-β
endothelium

description: Endoglin (Eng, CD105) is a type I membrane glycoprotein that functions in endothelial cells as an auxiliary receptor for transforming growth factor β (TGF-β)/bone morphogenetic protein (BMP) family members and as an integrin ligand, modulating the vascular pathophysiology. Besides the membrane-bound endoglin, there is a soluble form of endoglin (sEng) that can be generated by the action of the matrix metalloproteinase (MMP)-14 or -12 on the juxtamembrane region of its ectodomain. High levels of sEng have been reported in patients with preeclampsia, hypercholesterolemia, atherosclerosis and cancer. In addition, sEng is a marker of cardiovascular damage in patients with hypertension and diabetes, plays a pathogenic role in preeclampsia, and inhibits angiogenesis and tumor proliferation, migration, and invasion in cancer. However, the mechanisms of action of sEng have not yet been elucidated, and new tools and experimental approaches are necessary to advance in this field. To this end, we aimed to obtain a fluorescent form of sEng as a new tool for biological imaging. Thus, we cloned the extracellular domain of endoglin in the pEGFP-N1 plasmid to generate a fusion protein with green fluorescent protein (GFP), giving rise to pEGFP-N1/Eng.EC. The recombinant fusion protein was characterized by transient and stable transfections in CHO-K1 cells using fluorescence microscopy, SDS-PAGE, immunodetection, and ELISA techniques. Upon transfection with pEGFP-N1/Eng.EC, fluorescence was readily detected in cells, indicating that the GFP contained in the recombinant protein was properly folded into the cytosol. Furthermore, as evidenced by Western blot analysis, the secreted fusion protein yielded the expected molecular mass and displayed a specific fluorescent signal. The fusion protein was also able to bind to BMP9 and BMP10 in vitro. Therefore, the construct described here could be used as a tool for functional in vitro studies of the extracellular domain of endoglin.
Damage and Breakage of Silicon Wafers during Impact Loading on the Wafer Edge
Creators: name: Kaule, F.
name: Koepge, R.
name: Schoenfelder, S.
Publisher: name: WIP
Year: 2012
Subjects: Wafer-Based Silicon Solar Cells and Materials Technology
Manufacturing Issues and Processing

description: 27th European Photovoltaic Solar Energy Conference and Exhibition; 1179-1184
description: The reduction of the breakage rate during the production of solar cells is still a big issue in order to save costs. During manufacturing different handling steps are applied which leads to different kind of dynamical loadings, while the wafer edge seems to be one of the most vulnerable parts of the wafer. In this work the local impact loading at the wafer edge was investigated by experimental and numerical methods. Due to impact loading a local bending phenomenon was observed, which can lead to high tensile stress and damage in terms of microcrack propagation near the contact area.
Novel bivariate autoregressive model for predicting and forecasting irregularly observed time series
Creators: name: Elorrieta, Felipe
name: Eyheramendy, Susana
name: Palma, Wilfredo
name: Ojeda, Cesar
Publisher: name: arXiv
Year: 2021
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Methodology (stat.ME)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: In several disciplines it is common to find time series measured at irregular observational times. In particular, in astronomy there are a large number of surveys that gather information over irregular time gaps and in more than one passband. Some examples are Pan-STARRS, ZTF and also the LSST. However, current commonly used time series models that estimate the time dependency in astronomical light curves consider the information of each band separately (e.g, CIAR, IAR and CARMA models) disregarding the dependency that might exist between different passbands. In this paper we propose a novel bivariate model for irregularly sampled time series, called the bivariate irregular autoregressive (BIAR) model. The BIAR model assumes an autoregressive structure on each time series, it is stationary, and it allows to estimate the autocorrelation, the cross-correlation and the contemporary correlation between two unequally spaced time series. We implemented the BIAR model on light curves, in the g and r bands, obtained from the ZTF alerts processed by the ALeRCE broker. We show that if the light curves of the two bands are highly correlated, the model has more accurate forecast and prediction using the bivariate model than a similar method that uses only univariate information. Further, the estimated parameters of the BIAR are useful to characterize LongPeriod Variable Stars and to distinguish between classes of stochastic objects, providing promising features that can be used for classification purposes
description: 14 pages, 7 figures, 6 tables, 2 apendices. Accepted for publication in the Monthly Notices of the Royal Astronomical Society (MNRAS)
Safety and Performance Related Design of String Connection Boxes for Photovoltaic Systems
Creators: name: Finis, G.
name: Plattmann, C.
name: Sieker, T.
Publisher: name: WIP
Year: 2012
Subjects: Components for PV Systems
Balance of System Components

description: 27th European Photovoltaic Solar Energy Conference and Exhibition; 3652-3654
description: String connection boxes (SCB) are used in multi-string photovoltaic systems to combine the single
strings electrically and connect them with the input terminals of the inverter. Besides this main function, SCB can be
equipped with DC-breakers, which are used to disconnect the panels from the inverter for maintenance purposes.
Also diodes to prevent reverse current flow or string fuses can be installed in SCB. Above this, surge protective
devices installed in SCB can provide effective protection against surge currents and surge voltages occurring at the
DC-side of the PV generator, caused by the magnetic fields of lightning discharges for example. In some cases,
condition monitoring units, e. g. string current monitoring systems, are additionally integrated in SCB. Nowadays,
SCB are designed for up to 32 strings. The design of such a SCB requires fundamental knowledge in the field of lowvoltage
switchgear assemblies. This includes their thermal design. Regarding this, the consideration of dissipation
heat generated in string fuses under operation condition in the design of SCB is mandatory. In the case that the SCB
contains surge protective devices, the entire assembly – including the cabling, terminal blocks, a DC-breaker and
fuses – has to be designed to withstand a defined surge current stress. Additionally, to achieve an optimal protection
the cabling has to follow specific design rules. Based on several case studies, these general issues are discussed in this
paper. The results presented provide practical information for the design of string connection boxes.
Revelation of the role of impurities and conduction electron density in the high resolution photoemission study of ferromagnetic hexaborides
Creators: name: Maiti, Kalobaran
name: Medicherla, V. R. R.
name: Patil, Swapnil
name: Singh, Ravi Shankar
Publisher: name: arXiv
Year: 2007
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We investigate the temperature evolution of the electronic structure of ferromagnetic CaB$_6$ using ultra-high resolution photoemission spectroscopy; electronic structure of paramagnetic LaB$_6$ is used as a reference. High resolution spectra of CaB$_6$ reveal finite density of states at the Fermi level, $ε_F$ at all the temperatures and evidence of impurity induced localized features in the vicinity of $ε_F$, which are absent in the spectra of LaB$_6$. Analysis of the high resolution spectra suggests that disorder in B-sublattice inducing partial localization in the mobile electrons and low electron density at $ε_F$ is important to achieve ferromagnetism in these systems.
description: 4 figures
Principal Component Hierarchy for Sparse Quadratic Programs
Creators: name: Vreugdenhil, Robbie
name: Nguyen, Viet Anh
name: Eftekhari, Armin
name: Esfahani, Peyman Mohajerin
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optimization and Control (math.OC)
subject: Machine Learning (cs.LG)
subject: Machine Learning (stat.ML)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences

description: We propose a novel approximation hierarchy for cardinality-constrained, convex quadratic programs that exploits the rank-dominating eigenvectors of the quadratic matrix. Each level of approximation admits a min-max characterization whose objective function can be optimized over the binary variables analytically, while preserving convexity in the continuous variables. Exploiting this property, we propose two scalable optimization algorithms, coined as the "best response" and the "dual program", that can efficiently screen the potential indices of the nonzero elements of the original program. We show that the proposed methods are competitive with the existing screening methods in the current sparse regression literature, and it is particularly fast on instances with high number of measurements in experiments with both synthetic and real datasets.
Self-organised localisation
Creators: name: Giudice, GF
name: McCullough, M
name: You, T
Publisher: name: Apollo - University of Cambridge Repository
Year: 2021
Subjects: Regular Article - Theoretical Physics
Beyond Standard Model
Higgs Physics

description: Abstract We describe a new phenomenon in quantum cosmology: self-organised localisation. When the fundamental parameters of a theory are functions of a scalar field subject to large fluctuations during inflation, quantum phase transitions can act as dynamical attractors. As a result, the theory parameters are probabilistically localised around the critical value and the Universe finds itself at the edge of a phase transition. We illustrate how self-organised localisation could account for the observed near-criticality of the Higgs self-coupling, the naturalness of the Higgs mass, or the smallness of the cosmological constant.
Optimization of a-SiOx/a-SiNx Double Layer Antireflection Coatings for Silicon Solar Cells
Creators: name: Haug, H.
name: Krogh Selj, J.
name: Nordseth, O.
name: Stensrud Marstein, E.S.
Publisher: name: WIP
Year: 2012
Subjects: Wafer-Based Silicon Solar Cells and Materials Technology
Silicon Solar Cell Characterization and Modelling

description: 27th European Photovoltaic Solar Energy Conference and Exhibition; 1376-1378
description: In this work we present an optimization of single- and double layer antireflection coatings (ARCs) for silicon solar
cells. The wavelength-dependent reflectance and absorptance in the layers were calculated from experimental optical
data measured on silicon nitride (a-SiNx:H) and oxynitride (a-SiOxNy:H) films deposited by plasma enhanced
chemical vapour deposition with a wide range of compositions. Double layer ARCs were then designed by
optimizing the thickness and composition of the layers with respect to both the total integrated reflectance weighted
against the solar spectrum and the photogenerated current. Even though our double layer ARC can reduce the total
reflectance from a polished Si surface under glass below 1.7%, an increased absorption in the ARC compensates
some of this improvement. For moderately absorbing layers the relative photocurrent improvement from changing
from a single layer ARC to a double layer ARC is ~1% under glass and ~2% in air. The improvement of cell
efficiency may however be further increased by the enhanced passivation qualities of the more Si-rich layers.
Characterization of Through-Wafer Vias for MWT Cells
Creators: name: Nwofa, L.E.
name: Gribenski, D.
name: De Keersmaecker, K.
name: Van Der Heide, A.
name: Mohanan, S.
name: Borgers, T.
name: Ruythooren, W.
Publisher: name: WIP
Year: 2012
Subjects: Wafer-Based Silicon Solar Cells and Materials Technology
Silicon Solar Cell Characterization and Modelling

description: 27th European Photovoltaic Solar Energy Conference and Exhibition; 1379-1383
description: In back contact cells of the ‘metal wrap through’ (MWT) architecture, metallized vias are the most
important feature introduced compared to standard cells. While the vias are required to bring the contact from the front of
the cell to the back, they can contribute significantly to the resistive losses in the cell. Furthermore, since typically several
vias are used in parallel, assessing the reliability of the via metallization process on a cell is problematic. In this paper, we
describe a methodology that allows detailed characterization of MWT vias through dedicated test structures. Similar
structures are known in micro-electronics, but here we discuss the specific advantages and disadvantages of the approach
when applied to solar cells. Individual via resistance values of 5-30 mΩ were measured on test wafers at different
locations on the cell. The cross section of the vias clearly showed that some of the vias were partially filled or not filled to
the top of the wafer due to poor uniformity of the via drilling and/or bad printing process. These lead to the conclusion
that for proper via filling, one has to control the printing and drilling processes.
Changing the game of time resolved X-ray diffraction on the mechanochemistry playground by downsizing.
Creators: name: Lampronti, Giulio I
name: Michalchuk, Adam AL
name: Mazzeo, Paolo P
name: Belenguer, Ana
name: Sanders, Jeremy
name: Bacchi, Alessia
name: Emmerling, Franziska
Publisher: name: Apollo - University of Cambridge Repository
Year: 2021
Subjects: Article
/639/638/11/879
/639/638/549/933
/639/638/224/685
/145
article

description: Time resolved in situ (TRIS) monitoring has revolutionised the study of mechanochemical transformations but has been limited by available data quality. Here we report how a combination of miniaturised grinding jars together with innovations in X-ray powder diffraction data collection and state-of-the-art analysis strategies transform the power of TRIS synchrotron mechanochemical experiments. Accurate phase compositions, comparable to those obtained by ex situ measurements, can be obtained with small sample loadings. Moreover, microstructural parameters (crystal size and microstrain) can be also determined with high confidence. This strategy applies to all chemistries, is readily implemented, and yields high-quality diffraction data even using a low energy synchrotron source. This offers a direct avenue towards the mechanochemical investigation of reactions comprising scarce, expensive, or toxic compounds. Our strategy is applied to model systems, including inorganic, metal-organic, and organic mechanosyntheses, resolves previously misinterpreted mechanisms in mechanochemical syntheses, and promises broad, new directions for mechanochemical research.
Optimization of Metallic Nanoparticles for Plasmon-Enhanced Scattering at the Rear of c-Si Solar Cells
Creators: name: Vogt, M.R.
name: Altermatt, P.P.
name: Brendel, R.
Publisher: name: WIP
Year: 2012
Subjects: Material Studies, New Concepts and Ultra-High Efficiency
Fundamental Material Studies

description: 27th European Photovoltaic Solar Energy Conference and Exhibition; 85-88
description: Light trapping in planar solar cells is enhanced if the reflection on the rear side is made diffuse instead
of specular. In this study, we numerically simulate the scattering properties of spherical metal nanoparticles placed
onto the rear Si surface and imbedded in a medium of SiNx. Such particles exhibit a very strong scattering efficiency
due to surface plasmons. The goal is to cover a rather small fraction of the planar surface with metal particles and still
obtain scattering to a similar amount as from rough surfaces. Our results show that maximum back scattering
efficiency is obtained at about 150±25 nm particle diameter. This optimum size is the same for all examined metals
(Ag, Au, Cu and Al), but Al scatters significantly less than the others. The angular distribution of the scattered light is
similar to a dipole up to about the optimum diameter, above which higher modes start dominating and enhance
forward scattering.
Electro-Magnetic Waves within a Model for Charged Solitons
Creators: name: Borisyuk, Dmitry
name: Faber, Manfried
name: Kobushkin, Alexander
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We analyze the model of topological fermions (MTF), where charged fermions are treated as soliton solutions of the field equations. In the region far from the sources we find plane waves solutions with the properties of electro-magnetic waves.
description: 4 pages, 2 figures
Transition towards a Local 100 % Renewable Electricity Supply Based on PV, Wind, Batteries and Renewable Power Methane Using the Example of the Allgäu, Germany
Creators: name: Hlusiak, M.
name: Gerlach, A.-K.
name: Breyer, C.
Publisher: name: WIP
Year: 2012
Subjects: PV - a Major Electricity Source
PV in the Electricity Mix

description: 27th European Photovoltaic Solar Energy Conference and Exhibition; 4539-4543
description: This paper presents results of modelling cost optimised electricity generation systems for renewable energy shares
varying from 0 % to 100 % on an hourly timescale. The model takes into account generation from solar, wind and
natural gas fuelled power plants. Storage is incorporated as direct storage in batteries and indirect storage via
renewable power methane (RPM). Grid-parity enabled PV-battery systems are taken into account to model electricity
end-user behaviour. Results are presented for an exemplary region in Southern Germany aiming for 100 % renewable
electricity. We use localised hourly PV and wind resource and electricity demand data. Results include optimum
component sizing as well as levelised cost of electricity (LCOE). Impacts of changing fuel and carbon emission
prices are investigated.
Monolithic Integrated Series-Connected GaAs Solar Cells with Bypass Diodes for Reduced Joule Energy Loss under Concentration
Creators: name: Seno, M.
name: Watanabe, K.
name: Sugiyama, M.
name: Nakano, Y.
Publisher: name: WIP
Year: 2012
Subjects: Material Studies, New Concepts and Ultra-High Efficiency
Terrestrial Concentrator Systems

description: 27th European Photovoltaic Solar Energy Conference and Exhibition; 178-180
description: The concentrator photovoltaic (CPV) system can reduce the cost of the photovoltaic system and
improve conversion efficiency by increasing the concentration ratio. The problem is that concentration ratio is limited
by short-circuit current density (Jsc) due to cell resistance loss. In order to achieve much larger concentration ratio, the
monolithically integrated series-connected GaAs photovoltaic (PV) cells were fabricated. By dividing cells and
connecting them in series, the cells provide smaller short-circuit current (Isc) and larger open-circuit voltage (Voc).
This approach can reduce joule energy loss through the grids without decreasing electrical power output and achieve
much larger concentration ratio. In our design, 10 series-connected sub-cells, with bypass diodes in parallel with each
sub-cell, were integrated monolithically on semi-insulating GaAs. When some cells in the array were shaded, the
bypass diodes prevented the shaded cells from breakdown and reduce fluctuation of power output. The detection area
of a unit cell was 7.90 mm2
and an entire detection area occupied over 79% of the whole chip area. The arrayed 10
cells exhibited Voc of 9.0V under illumination (AM 1.5 G).
Dynamic Ly alpha jets
Creators: name: Koza, J.
name: Rutten, R. J.
name: Vourlidas, A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The solar chromosphere and transition region are highly structured and complex regimes. A recent breakthrough has been the identification of dynamic fibrils observed in H alpha as caused by field-aligned magnetoacoustic shocks. We seek to find whether such dynamic fibrils are also observed in Ly alpha. We used a brief sequence of four high-resolution Ly alpha images of the solar limb taken by the Very high Angular resolution ULtraviolet Telescope (VAULT), which displays many extending and retracting Ly alpha jets. We measured their top trajectories and fitted parabolas to the 30 best-defined ones. Most jet tops move supersonically. Half of them decelerate, sometimes superballistically, the others accelerate. This bifurcation may arise from incomplete sampling of recurrent jets. The similarities between dynamic Ly alpha jets and H alpha fibrils suggest that the magnetoacoustic shocks causing dynamic H alpha fibrils also affect dynamic Ly alpha jets.
description: 5 pages, 7 figures; changed title and content; accepted in Astronomy and Astrophysics; eps figures in full resolution are available at http://www.astro.sk/~koza/publications/vault/figs/
Cost-Effective Front Contact Metalization by Copper Paste for Screen-Printed Crystalline Silicon Solar Cells
Creators: name: Yoshiba, S.
name: Dhamrin, M.
name: Yoshida, M.
name: Uzum, A.
name: Itoh, U.
name: Tokuhisa, H.
name: Sekine, S.
name: Saitoh, T.
name: Kamisako, K.
Publisher: name: WIP
Year: 2012
Subjects: Wafer-Based Silicon Solar Cells and Materials Technology
Silicon Solar Cell Improvements

description: 27th European Photovoltaic Solar Energy Conference and Exhibition; 1730-1732
description: Ag front metallization cost shares about 30% of the total cost of cell fabrication process. Several new
front metallization processes have been recently introduced to reduce the use of silver as an alternative to it. Cu
electro-platting is a promising technique for metallization. However, the fast diffusivity of Cu in silicon causes
lifetime degradation. In order to avoid this degradation of lifetime, additional barrier layer with less diffusivity
metals such as Ti or Ni need to be used beneath the Cu metallization grid. Because the Ag busbar consumes about
60% of the total silver in the standard front H pattern metallization, replacing the Ag busbar with Cu busbar will
provide the best solution to reduce the cost and to avoid deterioration of the bulk quality by eliminating direct
contact between the Cu busbar and the silicon. In this work, low melting point alloy (LMPA) Cu paste was used for
the replacement of Ag front busbar of conventional crystalline silicon solar cells and were compared to the cells
with Ag contact.
Visible and Near-infrared Microdisk Resonators on a 4H-Silicon-Carbide-on-Insulator Platform
Creators: name: Wang, Chengli
name: Shen, Chen
name: Yi, Ailun
name: Yang, Shumin
name: Zhou, Liping
name: Zhu, Yifan
name: Huang, Kai
name: Song, Sannian
name: Zhou, Min
name: Zhang, Jiaxiang
name: Ou, Xin
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optics (physics.optics)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: Wavelength-sized microdisk resonators were fabricated on a single crystalline 4H-silicon-carbide-oninsulator platform (4H-SiCOI). By carrying out microphotoluminescence measurements at room temperature, we show that the microdisk resonators support whispering-gallery modes (WGMs) with quality factors up to $5.25 \times 10^3$ and mode volumes down to $2.69 \times(λ/n)^3$ at the visible and near-infrared wavelengths. Moreover, the demonstrated wavelength-sized microdisk resonators exhibit WGMs whose resonant wavelengths compatible with the zero-phonon lines of spin defects in 4H-SiCOI, making them a promising candidate for applications in cavity quantum electrodynamics and integrated quantum photonic circuits.
description: 5 pages, 4 figures
A novel deep intronic variant strongly associates with Alkaptonuria.
Creators: name: Lai, Chien-Yi
name: Tsai, I-Jung
name: Chiu, Pao-Chin
name: Ascher, David B
name: Chien, Yin-Hsiu
name: Huang, Yu-Hsuan
name: Lin, Yi-Lin
name: Hwu, Wuh-Liang
name: Lee, Ni-Chung
Publisher: name: Apollo - University of Cambridge Repository
Year: 2021
Subjects: Article
/692/4017
/692/699/317
article

description: Alkaptonuria is a rare autosomal recessive inherited disorder of tyrosine metabolism, which causes ochronosis, arthropathy, cardiac valvular calcification, and urolithiasis. The epidemiology of alkaptonuria in East Asia is not clear. In this study, patients diagnosed with alkaptonuria from January 2010 to June 2020 were reviewed. Their clinical and molecular features were further compared with those of patients from other countries. Three patients were found to have alkaptonuria. Mutation analyses of the homogentisate 1,2-dioxygenase gene (HGD) showed four novel variants c.16-2063 A > C, p.(Thr196Ile), p.(Gly344AspfsTer25), and p.(Gly362Arg) in six mutated alleles (83.3%). RNA sequencing revealed that c.16-2063 A > C activates a cryptic exon, causing protein truncation p.(Tyr5_Ile6insValTer17). A literature search identified another 6 patients with alkaptonuria in East Asia; including our cases, 13 of the 18 mutated alleles have not been reported elsewhere in the world. Alkaptonuria is rare in Taiwan and East Asia, with HGD variants being mostly novel and private.
The molecular characterization of a common human myelogenous leukemia-associated antigen (CAMAL)
Creators: name: Shipman, Robert Charles
Publisher: name: University of British Columbia
Year: 2010

description: Previous studies had demonstrated the presence of the p70 (CAMAL) molecule in human myeloid leukemia cells and the promyelocytic leukemia cell line HL60, but not in equivalent preparations of normal cells (Malcolm et al., 1982, 1984; Shipman et al., 1983; Logan et al., 1984). Subsequent studies demonstrated that the p70 (CAMAL) protein was detectable and expressed in human myeloid leukemia cells and the leukemic cell lines HL60, KG1, K562 and U937. The association of p70 (CAMAL) expression with human myeloid leukemia cells prompted its consideration as a candidate leukemia-associated antigen. The demonstration, following CAMAL purification and peptide sequencing, that two tryptic peptides (tp27, tp31) displayed significant homology to sequences present in human serum albumin (HSA) and human alpha-1-fetoprotein (AFP), while one tryptic peptide (tp20) displayed unique peptide sequence, suggested that CAMAL might represent a protein that was structurally and functionally related to the albumins. Consequently, a comparative biochemical analysis of CAMAL and HSA was initiated. The results of the comparative studies demonstrated that although CAMAL and HSA shared conformational antigenic determinants, both proteins were also shown to be distinct molecules by a number of other criteria. The possibility that the CAMAL preparation, used for protein sequencing and comparative studies, was contaminated with HSA was thought likely, in view of the HSA/AFP-related peptide sequences from the CAMAL tryptic peptide sequence analysis. However, other results, particularly the antibody reactivity and ligand binding studies, showed that the CAMAL preparation was not contaminated with HSA. The unique CAMAL tryptic peptide (tp20) sequence supported further the contention that CAMAL was a distinct protein with regions homologous to HSA and AFP. Further analysis of the CAMAL molecule, through extensive protein sequencing, will be, in all likelihood, the only means by which to establish the degree of relatedness between CAMAL, HSA and AFP.
Thermal equilibrium and statistical thermometers in special relativity
Creators: name: Cubero, David
name: Casado-Pascual, Jesús
name: Dunkel, Jörn
name: Talkner, Peter
name: Hänggi, Peter
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Astrophysics (astro-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: There is an intense debate in the recent literature about the correct generalization of Maxwell's velocity distribution in special relativity. The most frequently discussed candidate distributions include the Juettner function as well as modifications thereof. Here, we report results from fully relativistic one-dimensional (1D) molecular dynamics (MD) simulations that resolve the ambiguity. The numerical evidence unequivocally favors the Juettner distribution. Moreover, our simulations illustrate that the concept of 'thermal equilibrium' extends naturally to special relativity only if a many-particle system is spatially confined. They make evident that 'temperature' can be statistically defined and measured in an observer frame independent way.
description: version accepted for publication (5 pages), part of the introduction modified, new figures, additional references
Combing Laser Doping and Wet Chemical Etch Back for Industrial Selective Emitter Solar Cells
Creators: name: Sastrawan, R.
name: Aigner, F.
name: Becker, A.
name: Böhme, R.
name: Delahaye, F.
name: Hoffmann, A.
name: Heeren, A.
name: Kray, D.
name: Latzel, B.
name: Rentsch, J.
name: Saule, W.
name: Schmitt, C.
name: Straub, B.
name: Träger, A.
name: Queißer, S.
name: Volk, A.
name: Zanger, L.
name: Zimmer, M.
name: Nussbaumer, H.
Publisher: name: WIP
Year: 2012
Subjects: Wafer-Based Silicon Solar Cells and Materials Technology
Silicon Solar Cell Improvements

description: 27th European Photovoltaic Solar Energy Conference and Exhibition; 1563-1565
description: In this paper, we present results of the development of a selective emitter structure for crystalline silicon solar cells
suitable for industrial mass production. The process sequence follows the approach first introduced by Volk et al [1].
Laser doping is performed directly after emitter diffusion. In a second step, the emitter is etched back homogenously
without a mask to improve the emitter quality and remove the dead layer. While the resulting selective emitter yields
a higher efficiency potential than with laser doping alone, the simplicity of the homogenous etch back step, results in
a lower invest and COO than a “Mask and Etch Back” approach.
On life time samples the processes of emitter diffusion, laser doping and emitter etch back were thoroughly studied.
Development was performed on industrial production equipment in preparation for a transfer of this technology to
mass production. The optimization of the selective emitter on 156 mm cz-solar cells yielded an average efficiency of
18,60 %, which corresponded to an efficiency gain of 0,3% compared to our baseline.
Longer-term mortality following SARS-CoV-2 infection in people with severe mental illness: retrospective case-matched study.
Creators: name: Chen, Shanquan
name: Fernandez-Egea, Emilio
name: Jones, Peter
name: Lewis, Jonathan R
name: Cardinal, Rudolf
Publisher: name: Apollo - University of Cambridge Repository
Year: 2021
Subjects: SARS-CoV-2 infection
Severe mental illness
mortality
retrospective case-matched

description: Persisting symptoms and dysfunction after SARS-CoV-2 infection have frequently been observed. However, information on the aftermath of COVID-19 is inadequate. We followed up people with severe mental illness (SMI) infected with SARS-CoV-2, and evaluated their longer-term mortality, using data from Cambridgeshire and Peterborough NHS Foundation Trust, UK. We examined the time course and duration of mortality risk from the point of diagnosis. After SARS-CoV-2 infection, people with SMI had a substantially higher risk of death (hazard ratio (HR) = 5.16, 95% confidence interval (CI) 1.56-17.03; P = 0.007) during the first 28 days and during the following 28-60 days (HR = 2.96, 95% CI 1.21-7.26; P = 0.018) than those without infection, but after 60 days the additional risk of death was no longer significant (HR = 2.33, 95% CI 0.83-6.53; P = 0.107).
Numerical simulations of rotating axisymmetric sunspots
Creators: name: Botha, G. J. J.
name: Busse, F. H.
name: Hurlburt, N. E.
name: Rucklidge, A. M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: A numerical model of axisymmetric convection in the presence of a vertical magnetic flux bundle and rotation about the axis is presented. The model contains a compressible plasma described by the nonlinear MHD equations, with density and temperature gradients simulating the upper layer of the sun's convection zone. The solutions exhibit a central magnetic flux tube in a cylindrical numerical domain, with convection cells forming collar flows around the tube. When the numerical domain is rotated with a constant angular velocity, the plasma forms a Rankine vortex, with the plasma rotating as a rigid body where the magnetic field is strong, as in the flux tube, while experiencing sheared azimuthal flow in the surrounding convection cells, forming a free vortex. As a result, the azimuthal velocity component has its maximum value close to the outer edge of the flux tube. The azimuthal flow inside the magnetic flux tube and the vortex flow are prograde relative to the rotating cylindrical reference frame. A retrograde flow appears at the outer wall. The most significant convection cell outside the flux tube is the location for the maximum value of the azimuthal magnetic field component. The azimuthal flow and magnetic structure are not generated spontaneously, but decay exponentially in the absence of any imposed rotation of the cylindrical domain.
description: 21 pages, 28 figures, 5 tables
One-Step Electrochemical Deposition of Cu-In-Ga Mixed Oxide Thin Films for Low-Cost CIGS Solar Cells
Creators: name: Duchatelet, A.
name: Chassaing, E.
name: Savidand, G.
name: Vannier, R.N.
name: Lincot, D.
Publisher: name: WIP
Year: 2012
Subjects: Thin Film Solar Cells
CdTe, CIS and Related Ternary and Quaternary Thin Film Solar Cells

description: 27th European Photovoltaic Solar Energy Conference and Exhibition; 2805-2807
description: One step electrodeposition of mixed copper indium gallium oxides and hydroxides film has been
carried out by cathodic deposition from dissolved metallic salts in nitrate electrolyte. The deposition conditions allow
to control the composition of the film and the proportion of metallic elements in the optimal range for CIGS. The
precursor films are then reduced into mixed metallic film by thermal annealing in an hydrogen containing atmosphere
and then transformed in CIGS by selenization with elemental selenium. Cell efficiency of 9.4% has been obtained
with this process.
Fermi surface of superconducting LaFePO determined by quantum oscillations
Creators: name: Coldea, A. I.
name: Fletcher, J. D.
name: Carrington, A.
name: Analytis, J. G.
name: Bangura, A. F.
name: Chu, J. -H.
name: Erickson, A. S.
name: Fisher, I. R.
name: Hussey, N. E.
name: McDonald, R. D.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We report extensive measurements of quantum oscillations in the normal state of the Fe-based superconductor LaFePO, (Tc ~ 6 K) using low temperature torque magnetometry and transport in high static magnetic fields (45 T). We find that the Fermi surface is in broad agreement with the band-structure calculations with the quasiparticle mass enhanced by a factor ~2. The quasi-two dimensional Fermi surface consist of nearly-nested electron and hole pockets, suggesting proximity to a spin/charge density wave instability.
description: to appear in Physical Review Letters
Thermal Stability of Spatial ALD Deposited Al2O3 Capped by PECVD SiNx for the Passivation of Lowly- and Highly-Doped p-Type Silicon Surfaces
Creators: name: Richter, A.
name: Souren, F.M.M.
name: Schuldis, D.
name: Görtzen, R.M.W.
name: Benick, J.
name: Hermle, M.
name: Glunz, S.W.
Publisher: name: WIP
Year: 2012
Subjects: Wafer-Based Silicon Solar Cells and Materials Technology
Manufacturing Issues and Processing

description: 27th European Photovoltaic Solar Energy Conference and Exhibition; 1133-1137
description: Al2O3 deposited by atomic layer deposition (ALD) is known to provide an excellent passivation on
lowly- and highly-doped p-type silicon surfaces even after contact firing processes. Therefore, Al2O3 layers are of
great interest for the passivation of the rear side of p-type solar cells as well as the boron-doped emitter of n-type solar
cells. In this work we studied the passivation quality of fired Al2O3/SiNx layer stacks on lowly- and highly-doped
p-type silicon surfaces applying an in-line capable, spatial ALD tool for the Al2O3 deposition. On both surfaces we
observed a very high level of surface passivation for stacks with 4 nm Al2O3 after firing. For lowly-doped p-type wafers,
we measured effective lifetimes up to ~2.8 ms, which correspond to an upper limit for the surface recombination
velocity of ~3 cm/s. On textured p+np+ samples diffused with a shallow boron doped emitter, we obtained emitter saturation
current densities around 50 fA/cm2, allowing an open-circuit voltage potential in the range of 700 mV. Spatially
resolved lifetime images revealed a very uniform passivation over the whole wafer for both types of samples.
These results demonstrate that Al2O3/SiNx stacks are well suited for the industrial fabrication of p-type and n-type solar
cells, without the necessity of an extra thermal out-gassing step between Al2O3 and SiNx deposition.
Characterisation of Laser Scribes in Thin Film Photovoltaics by Coherence Correlation Interferometry
Creators: name: Maniscalco, B.
name: Kaminski, P.
name: Claudio, G.
name: Walls, J.M.
name: Yu, Y.
name: Mansfield, D.
name: Crozier, M.
name: Brunton, A.
Publisher: name: WIP
Year: 2012
Subjects: Thin Film Solar Cells
CdTe, CIS and Related Ternary and Quaternary Thin Film Solar Cells

description: 27th European Photovoltaic Solar Energy Conference and Exhibition; 2808-2811
description: In this paper we present results measuring the precise shape of laser scribes in thin film photovoltaics using
Coherence Correlation Interferometry (CCI). Laser ablation is used in interconnect processes in all types of thin film
devices, including those based on CdTe, CIGS and amorphous silicon. The work presented in this paper was focused on
the use of a laser ablation process in the interconnect of thin film CdTe modules. This process is known as monolithic
integration. The laser scribe measurements presented here were obtained on a nanometre scale using Coherence
Correlation Interferometry. The Coherence Scanning Interferometry (CSI) technique is able to provide three and two
dimensional topographical images of the sample surface, with an ultimate vertical resolution of 0.01nm. It provides two
dimensional profiles of the laser ablated trenches, from which it is possible to extract quantitative information of the
detailed shape of the scribe including precise measurements of both depth and width. In addition, the CCI is able to
provide detailed analysis of surface roughness within the bottom of the trench which is important for efficient electrical
contact.
Optimal Energy Management of Photovoltaic Power Generation Combined with Storage System: Application to the French Regulation
Creators: name: Bourry, F.
name: Martin, N.
name: Berseneff, B.
name: Hassine, Z.
name: Buttin, H.
name: Le Pivert, X.
name: Lemaire, E.
name: Perrin, M.
Publisher: name: WIP
Year: 2012
Subjects: PV Systems
Large PV Power Plants and Distributed PV: System Aspects and Grid Connection

description: 27th European Photovoltaic Solar Energy Conference and Exhibition; 3834-3838
description: Photovoltaic (PV) generation is characterized by a low predictability, a high variability and a low
controllability, which may be critical for the large scale integration of PV generation into power systems. In order to
increase the integration of PV generation in French oversea “territories”, the French energy regulation agency (CRE)
proposed a set of technical constraints for PV plants regarding the grid integration. These constraints include the
necessity to inject the power delivered by the PV plant at a constant power during a period which is forecasted the
day before the delivery, as well as a limit of the increasing and decreasing ramps. A solution to fullfill these
constraints consists in combining the PV plant with an electrical energy storage system (ESS). This paper presents the
simulation of the operation of the combined system, including the energy management system. Such simulations are
used to calculate the optimal ESS sizing. Also, the energy management strategy algorithms developped for simulation
are deployed for real-time operation of a combined PV-ESS plant. The results from the operation of a 20 kWp PV
plant combined with a 10 kW – 100 kWh RedOx Vanadium flow battrey are presented.