cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Assessment of Critical Success Factors of ERP Implementation: perception survey of warehousing operation employees of ethio telecom
Creators: name: Tadese, Haregewoin
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2017

description: Firms now a day are pursuing and using different information technology application that simplify their operation and make them competitive. ERP is an IT software application with a lot of benefit packages and it is widely accepted and implemented by different companies since 1990s. This study was conducted with the pursuit of assessing the perception of warehousing operation employees of ethio telecom on critical success factors of ERP implementation. The study tries to analyze factors that made ERP implementation successful in the company warehouses located in Addis Abeba and examine the association between critical success factors and successfulness of ERP. Success indicators of ERP system were also assessed. Primary data was collected thorough structured questionnaire. While secondary data was taken from ERP support team section of the company. 76 questionnaires out of 83 distributed questionnaires were returned and analyzed using Descriptive and explanatory research design by applying SPSS version 20. The findings of multiple regression analysis done on SPSS showed that all the nine critical success factors (top management commitment and support, project management, user training, data accuracy, effective communication, change management clear goals and objectives, perceived usefulness and consultant support) were found to have a positive relationship with success fullness of ERP in ethio telecom warehouses. And except for change management the 8 variables (CSFS) were found to be the significant predictors of successfulness of ERP implementation in ethio telecom warehouses. In order to get the perceived advantages of ERP the company must work on change management and should also work more on the rest critical success factors. With regard to success indicators of ERP system all the 10 constructed success measurements with the mean value above 4 were accepted as success indicator by the respondents. This study can be further investigated with larger sample size by incorporating different companies' warehouses in the future
Surface Modification of Cover Glass for Solar Panels by Creating a Nanostructure on the Surface by Maskless Plasma Texturing with Fluorocarbon
Creators: name: Okhorzina, A.
name: Bernhard, N.
Publisher: name: WIP
Year: 2021
Subjects: New Materials and Concepts for Photovoltaic Devices
New Materials and Concepts for Cells and Modules

description: 38th European Photovoltaic Solar Energy Conference and Exhibition; 68-71
description: The aim of this work is to increase the optical transmission of the front glass of solar modules. Dry plasma etching is being studied to reduce surface reflection from solar glass, especially borosilicate glass. For solar glass is no optimal coating material to create an anti-reflective coating with a suitable refractive index. The alternative could be a micro- or nano-structuring of the surface by means of plasma etching, whereby a surface layer with the required effective refractive index is generated. Plasma texturing was used as the method for producing this effective layer. Different types of plasmas and the mechanisms of their operation during SiO2 etching are analyzed. CF4 and O2 were chosen as working gases. The etching was performed with capacitive (CCP) and inductive (ICP) coupled plasmas or a combination of both and the effects of their use in the texturing process are described. The changes in the optical properties were determined with a UV / VIS spectrometer.
Increase Optical Performance of Silicon Based Heterojunction Solar Cells with TiO2 Nanorod Structures
Creators: name: Sekertekin, B.
name: Yildiz, A.
Publisher: name: WIP
Year: 2021
Subjects: New Materials and Concepts for Photovoltaic Devices
Fundamental Studies

description: 38th European Photovoltaic Solar Energy Conference and Exhibition; 64-67
description: TiO2 metal oxide layers are used for photovoltaic studies and diode applications because of their excellent properties like chemical resistance, high refractive index, and high dielectric constant. TiO2 can be operated as an anti-reflecting coating (ARC) and presents an n-type behavior because of the presence of donor-type defects, and titanium interstitials atoms. One-dimensional nanostructures such as nanorods, nanowires, etc. of TiO2 have been studied due to their ability to increase the charge separation rate and acting as a pathway for charge carrier transport. In this study, the TiO2 layer as a seed layer was spin-coated on a p-Si wafer and glass. Then, TiO2 nanostructures were synthesized by hydrothermal method with lower reaction temperature which facilitates a reduction in agglomeration between particles. The morphology of nanostructures as physical shape, length, diameter, and alignment is controlled and changed during hydrothermal synthesis by setting reaction time, temperature, and solution rate. The structural, morphological, and optical properties of the nanostructures were determined utilizing XRay Diffraction (XRD), scanning electron microscopy (SEM), and UV-Vis spectrometer measurements. Currentvoltage (I-V) characteristics of the p-n heterojunction device based on Ag/ TiO2 nanostructures/TiO2 seed layer/pSi/Ag were investigated under dark and light illumination. The results revealed that the performance parameters of the device were significantly improved with TiO2 nanostructures.
Assessment of baseline conditions for all case studies
Creators: name: Kleyböcker, Anne
name: Kim, Jung Eun
name: Hofman, Jan
name: Serra, Anna
name: Casas, Sandra
Publisher: name: Zenodo
Year: 2023

description: This report describes the baseline conditions of each of the demo cases involved in NextGen before the start of the project and all pre-existing infrastructures and systems – prior to NextGen interventions across water, energy and material cycles. The baseline of the 10 sites (Altenrhein, Athens, Braunschweig, Bucharest, Costa Brava, Filton Airfield, Gotland, La Trappe, Spernal and Westland region) will be used to demonstrate the benefits and improvements achieved within the NextGen project, through the implementation of new CE solutions by the project, at each demo case.
Pseudo-Hermitian systems, involutive symmetries and pseudofermions
Creators: name: Cherbal, O.
name: Trifonov, D.
name: Zenad, M.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Physics (quant-ph)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We have briefly analyzed the existence of the pseudofermionic structure of multilevel pseudo-Hermitian systems with odd time-reversal and higher order involutive symmetries. We have shown that 2N-level Hamiltonians with N-order eigenvalue degeneracy can be represented in the oscillator-like form in terms of pseudofermionic creation and annihilation operators for both real and complex eigenvalues. The example of most general four-level traceless Hamiltonian with odd time-reversal symmetry, which is an extension of the SO(5) Hermitian Hamiltonian, is considered in greater and explicit detail.
description: 15 pages
Optimization of Random Subwavelength Structures with Anti-Reflective Properties on Photovoltaic Glasses
Creators: name: Pinto Fuste, C.L.
name: Cornago, I.
name: Zugasti, E.
name: Bengoechea, J.
Publisher: name: WIP
Year: 2021
Subjects: New Materials and Concepts for Photovoltaic Devices
Fundamental Studies

description: 38th European Photovoltaic Solar Energy Conference and Exhibition; 54-58
description: Subwavelength structures (SWSs) have the ability to suppress Fresnel reflections, for that reason, random SWSs have begun to be fabricated on glass. However, random structures can hardly be simulated and therefore, they cannot be easily computationally studied. In this work, using a mathematical model to simulate random SWSs and the Effective Medium Theory (EMT), we present a parametric analysis of two different SWSs in order to understand the influence that their main parameters have in the spectral reflectance. Moreover, we analyze the possibility of implanting these structures on photovoltaic glass to reduce its reflectance, and therefore, increase the solar cell efficiency. For this reason, we have made an optimization of these structures maximizing the theoretical photogenerated short-circuit current density that a solar cell would produce laminated with these structured glasses. Finally, we have analyzed the omnidirectional property of these SWSs obtaining promising results.
Accurate Determination of Contact Resistivity With Fully Metallized Test Structures
Creators: name: Tsoi, K.
name: Türkay, D.
name: Yerci, S.
Publisher: name: WIP
Year: 2021
Subjects: New Materials and Concepts for Photovoltaic Devices
Fundamental Studies

description: 38th European Photovoltaic Solar Energy Conference and Exhibition; 59-63
description: Among the widely used methods such as transfer length or Cox and Strack methods to determine the contact resistivity of various interfaces, contact resistivity can also be extracted using fully metallized test structures. In this structure, both sides of a sample are covered with metal without any patterning, and the resistance is measured between the top and bottom sides. The contact resistivity with such samples is calculated by subtracting the resistance of the bulk, conductive (if present), and metal layers from the total resistance of the structure. However, it is possible that the contribution of contact resistivity to the total resistance may be overestimated due to the metal’s finite sheet resistance and partial contacting scheme of the sample. These effects result in current traveling through a limited area inside the sample, increasing the contribution of the contact resistivity. In this work, we use a recently proposed spreading resistance model to accurately determine contact resistivity of the fully metallized test structures. We demonstrate a relative error between the proposed formulation and finite element method simulations below 1.3 %. Moreover, we demonstrate the applicability of the formulation experimentally with Ag/MoOx/(p)c-Si/MoOx/Ag structures.
The 2PI effective action at four loop order in $φ^4$ theory
Creators: name: Carrington, M. E.
name: Meggison, B. A.
name: Pickering, D.
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: It is well known that perturbative pressure calculations show poor convergence. Calculations using a two particle irreducible (2PI) effective action show improved convergence at the 3 loop level, but no calculations have been done at 4 loops. We consider the 2PI effective theory for a symmetric scalar theory with quartic coupling in 4-dimensions. We calculate the pressure and two different non-perturbative vertices as functions of coupling and temperature. Our results show that the 4 loop contribution can become larger than the 3 loop term when the coupling is large. This indicates a breakdown of the 2PI approach, and the need for higher order $n$PI approximations. In addition, our results demonstrate the renormalizability of 2PI calculations at the 4 loop level. This is interesting because the counterterm structure of the 2PI theory at 4 loops is different from the structure at $n\le 3$ loops. Two vertex counterterms are required at the 4 loop level, but not at lower loop order. This unique feature of the 2PI theory has not previously been verified numerically.
description: 15 pages, 6 figures
Equation governing the probability density evolution of multi-dimensional linear fractional differential systems subject to Gaussian white noise
Creators: name: Luo, Yi
name: Lyu, Meng-Ze
name: Chen, Jian-Bing
name: Spanos, Pol D.
Publisher: name: College Park, Md : [Verlag nicht ermittelbar]
Year: 2023
Subjects: subject: Analytical intrinsic drift coefficient
subject: Dimension reduction
subject: Globally-evolving-based generalized density evolution equation (GE-GDEE)
subject: Linear fractional differential system
subject: Non-Markovian system
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: Stochastic fractional differential systems are important and useful in the mathematics, physics, and engineering fields. However, the determination of their probabilistic responses is difficult due to their non-Markovian property. The recently developed globally-evolving-based generalized density evolution equation (GE-GDEE), which is a unified partial differential equation (PDE) governing the transient probability density function (PDF) of a generic path-continuous process, including non-Markovian ones, provides a feasible tool to solve this problem. In the paper, the GE-GDEE for multi-dimensional linear fractional differential systems subject to Gaussian white noise is established. In particular, it is proved that in the GE-GDEE corresponding to the state-quantities of interest, the intrinsic drift coefficient is a time-varying linear function, and can be analytically determined. In this sense, an alternative low-dimensional equivalent linear integer-order differential system with exact closed-form coefficients for the original high-dimensional linear fractional differential system can be constructed such that their transient PDFs are identical. Specifically, for a multi-dimensional linear fractional differential system, if only one or two quantities are of interest, GE-GDEE is only in one or two dimensions, and the surrogate system would be a one- or two-dimensional linear integer-order system. Several examples are studied to assess the merit of the proposed method. Though presently the closed-form intrinsic drift coefficient is only available for linear stochastic fractional differential systems, the findings in the present paper provide a remarkable demonstration on the existence and eligibility of GE-GDEE for the case that the original high-dimensional system itself is non-Markovian, and provide insights for the physical-mechanism-informed determination of intrinsic drift and diffusion coefficients of GE-GDEE of more generic complex nonlinear systems.
Tandem Luminescent Solar Concentrators: Optimizing the Number of Stacked Plates
Creators: name: Sokolovskyi, I.O.
name: Kulish, M.R.
name: Sachenko, A.V.
name: Kostylyov, V.P.
name: Shkrebtii / Chkrebiti, A.I.
Publisher: name: WIP
Year: 2021
Subjects: New Materials and Concepts for Photovoltaic Devices
Fundamental Studies

description: 38th European Photovoltaic Solar Energy Conference and Exhibition; 45-48
description: Using the Monte Carlo formalism, the maximum efficiency of the luminescent photons transport to the plates edges in the tandem luminescent solar concentrator (LSC) is calculated for the stack of plates with different luminophore’s parameters. It is shown that increasing the number of plates in the stack decreases thermalization losses and increases reflection losses. The efficiency dependence on the number of plates saturates after 8 plates for the optimal distribution of photon flux between the plates. The thermalization and reflection losses for this case become equal and close to the escape cone losses. On the other hand, for nonoptimal photon flux distribution, the efficiency has a maximum below that one for the optimal flux, and is reached at a smaller number of plates. The higher refractive index of the plates’ material, the efficiency maximum is reached for smaller numbers of plates.
Operational Demo Cases
Creators: name: Serra, Anna
name: Casas, Sandra
name: Kleyböcker, Anne
name: Kim, Jung Eun
name: Hofman, Jan
Publisher: name: Zenodo
Year: 2023

description: This deliverable demonstrates the operational status of 10 demo cases deployed in 8 EU Member States and their specific NextGen objectives and CE solutions For each demo case, the deliverable show pictures of the prototypes and pilots installed, introduces the first technical results obtained until M 30 provides the specific KPIs (actual and expected) and the expected next steps per each site
How Do Dust Devil-Like Vortices Depend on Model Resolution? A Grid Convergence Study Using Large-Eddy Simulation
Creators: name: Giersch, Sebastian
name: Raasch, Siegfried
Publisher: name: Dordrecht [u.a.] : Springer Science + Business Media B.V
Year: 2023
Subjects: subject: Convective boundary layer
subject: Dust devils
subject: Grid convergence
subject: Large-eddy simulation
subject: PALM model system
subject: Dewey Decimal Classification::500 | Naturwissenschaften::550 | Geowissenschaften

description: Dust devils are organized convective vortices with pressure drops of hundreds of pascals that spirally lift surface material into the air. This material modifies the radiation budget by contributing to the atmospheric aerosol concentration. Quantification of this contribution requires good knowledge of the dust devil statistics and dynamics. The latter can also help to understand vortex genesis, evolution and decay, in general. Dust devil-like vortices are numerically investigated mainly by large-eddy simulation (LES). A critical parameter in these simulations is the grid spacing, which has a great influence on the dust devil statistics. So far, it is unknown which grid size is sufficient to capture dust devils accurately. We investigate the convergence of simulated convective vertical vortices that resemble dust devils by using the LES model PALM. We use the nesting capabilities of PALM to explore grid spacings from 10 to 0.625 m. Grid spacings of 1 m or less have never been used for the analysis of dust devil-like vortices that develop in a horizontal domain of more than 10 km2. Our results demonstrate that a minimum resolution of 1.25 m is necessary to achieve a convergence for sample-averaged quantities like the core pressure drop. This grid spacing or smaller should be used for future quantifications of dust devil sediment fluxes. However, sample maxima of the investigated dust devil population and peak velocity values of the general flow show no convergence. If a qualitative description of the dust devil flow pattern is sufficient, we recommend a grid spacing of 2.5 m or smaller.
Enabling P4 Network Telemetry in Edge Micro Data Centers With Kubernetes Orchestration
Creators: name: Scano, Davide
name: Giorgetti, Alessio
name: Paolucci, Francesco
name: Sgambelluri, Andrea
name: Chammanara, Javad
name: Rothman, John
name: Al-Bado, Mustafa
name: Marx, Edgard
name: Ahearne, Sean
name: Cugini, Filippo
Publisher: name: New York, NY : IEEE
Year: 2023
Subjects: subject: kubernetes
subject: micro data center
subject: P4
subject: SDN
subject: telemetry
subject: Dewey Decimal Classification::000 | Allgemeines, Wissenschaft::000 | Informatik, Wissen, Systeme::004 | Informatik
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau::621 | Angewandte Physik::621,3 | Elektrotechnik, Elektronik

description: Integrating computation resources with networking technologies is an hot research topic targeting the optimization of containers deployment on a set of host machines interconnected by a network infrastructure. Particularly, next generation edge nodes will offer significant advantages leveraging on integrated computation resources and networking awareness, enabling configurable, granular and monitorable quality of service to different micro-services, applications and tenants, especially in terms of bounded end-to-end latency. In this regard, SDN is a key technology enabling network telemetry and traffic switching with the granularity of the single traffic flow. However, currently available solutions are based on legacy SDN techniques, not enabling the matching of tunneled traffic, and thus require a tricky integration inside the hosts where containers are deployed. This work considers Kubernetes clusters deployed on next generation edge micro data center platforms and proposes an innovative SDN solution exploiting the P4 technology to gain visibility inside tunnelled traffic exchanged among pods. This way, the integration is achieved at the control plane level through the communication between Kubernetes and the SDN controller. The proposed solution is experimentally validated including a comprehensive framework enabling effective traffic switching and in-band telemetry at pod level. The major paper contributions consist in the design and the development of: (i) the networking applications at SDN control plane level; (ii) the P4 switch pipeline at the data plane level; (iii) the monitoring system used to collect, aggregate and elaborate the telemetry data.
Defect Trapping in Thin Films Probed by Frequency Domain Photoluminescence
Creators: name: Bérenguier, B.
name: Asseko, A.
name: Guillemoles, J.-F.
Publisher: name: WIP
Year: 2021
Subjects: New Materials and Concepts for Photovoltaic Devices
Fundamental Studies

description: 38th European Photovoltaic Solar Energy Conference and Exhibition; 49-53
description: Time Resolved Photoluminescence (TRPL) is considered as a standard technique to measure carrier lifetime in thin film semi-conductors. Nevertheless, the excitation of TRPL is sudden, short and therefore the method is focused on fast recombination processes. I case of non mono-exponential decays, the tail of the decays may contain information about shallow traps and slow mechanisms but is quite often noisy and not always considered appropriately. Another approach based on Modulated Photoluminescence, also called Frequency Domain Photoluminescence (FDPL) has been developed previously and consists in the measurement the PL signal under a modulated illumination source. Coupled to mathematical modelling, it allows for extraction of information about the recombination mechanisms including both slows time constants. Here, we present a significant upgrade to the conventional FDPL method by extending the modulation frequency range from 500 Hz to 200 MHz using a Time Correlated Single Photon Counting device, the setup being able to scan both slow and fast mechanisms. We applied FDPL to thin passivated GaAs layers, and observe V-shapes in the phases curves, which are a characteristic of shallow trapping. We also attempt to fit measurement on triple cation perovskites using the two first harmonics of the FDPL signal.
Laser bioprinting of human iPSC-derived neural stem cells and neurons: Effect on cell survival, multipotency, differentiation, and neuronal activity
Creators: name: Koch, Lothar
name: Deiwick, Andrea
name: Soriano, Jordi
name: Chichkov, Boris
Publisher: name: Singapore : Whioce
Year: 2023
Subjects: subject: Bioprinting
subject: Collective neuronal activity
subject: Laser
subject: Neural stem cells
subject: Neuronal networks
subject: Neurons
subject: Synapse
subject: Dewey Decimal Classification::500 | Naturwissenschaften::570 | Biowissenschaften, Biologie

description: Generation of human neuronal networks by three-dimensional (3D) bioprinting is promising for drug testing and hopefully will allow for the understanding of cellular mechanisms in brain tissue. The application of neural cells derived from human induced-pluripotent stem cells (hiPSCs) is an obvious choice, since hiPSCs provide access to cells unlimited in number and cell types that could be generated by differentiation. The questions in this regard include which neuronal differentiation stage is optimal for printing of such networks, and to what extent the addition of other cell types, especially astrocytes, supports network formation. These aspects are the focus of the present study, in which we applied a laser-based bioprinting technique and compared hiPSC-derived neural stem cells (NSCs) with neuronal differentiated NSCs, with and without the inclusion of co-printed astrocytes. In this study, we investigated in detail the effects of cell types, printed droplet size, and duration of differentiation before and after printing on viability, as well as proliferation, stemness, differentiation potential, formation of dendritic extensions and synapses, and functionality of the generated neuronal networks. We found a significant dependence of cell viability after dissociation on differentiation stage, but no impact of the printing process. Moreover, we observed a dependence of the abundance of neuronal dendrites on droplet size, a marked difference between printed cells and normal cell culture in terms of further differentiation of the cells, especially differentiation into astrocytes, as well as neuronal network formation and activity. Notably, there was a clear effect of admixed astrocytes on NSCs but not on neurons.
Victoria Masonic Temple [Project: 230-01-76/485-07-99]
Creators: name: Hodgson, Alan J. (Alan James)
Publisher: name: University of Victoria Libraries
Year: 2022
Subjects: subject: Masonic Temple (Victoria, B.C.)
subject: Architects
valueUri: http://id.worldcat.org/fast/813114
subject: Architecture
valueUri: http://id.worldcat.org/fast/813346
subject: FOS: Civil engineering

description: Project material consists of two large folders of architectural drawings and other material pertaining to series of addition and alteration projects to the Victoria Masonic Temple, located at 650 Fisgard Street in Victoria, B.C. Projects include a major addition, which was never built, to the Douglas Street side of the building; alterations to ceiling of the lodge room; and installation of a stairlift. Included are floor plans; ceiling plans; a cadastral plan; elevations; section drawings; perspective drawings; photographs; HVAC plans; plumbing plans; paint swatches; CAD designs; notes; sketches; and other material produced at various stages of the design process. The Masonic Temple was designated a City of Victoria Heritage Property in 1995.
Framing organizational dynamics towards value creation systems to slow down resource flows
Creators: name: Hofmann, Florian
Publisher: name: Technische Universität Berlin
Year: 2021
Subjects: subject: 500 Naturwissenschaften und Mathematik
subject: 600 Technik, Technologie
subject: 300 Sozialwissenschaften
subject: circular economy
subject: organizational change
subject: circular business model
subject: sustainable business model
subject: sustainability transitions

description: Practitioners from politics, economics, and the civil society, but also scholars increasingly recognize that business contributions to a circular oriented transition of the society are founded in new business models. However, most research in this field remains theoretically conceptual and offers a rather static view of a complex and constantly changing reality. This study strives to contribute to the shift in the circular business model debate from its definitional and motivational aspects to the understanding of organizational dynamics connected to the efforts of firms that experimenting with circular oriented business configurations. Based on eight problem-centered expert interviews with business consultants, the study provides a set of propositions on how they are framing corporate transitions towards circular-sufficiency value creation systems. It reveals starting points for understanding patterns of circular change in firms, which may simultaneously serve as impulses for future research investigations.
A simple model for rapidity fluctuations in the initial state of ultra-relativistic heavy-ion collisions
Creators: name: Broniowski, Wojciech
name: Bozek, Piotr
Publisher: name: arXiv
Year: 2015
Subjects: subject: Nuclear Theory (nucl-th)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: Two-particle pseudorapidity correlations are analyzed in a simple model, where in the initial stage of the reaction multiple sources, extended in rapidity, are created. We show how the fluctuations of the length of the sources in rapidity generate correlations in the initial entropy deposition, which later contribute to the observed longitudinal correlations in hadron production. Our analysis, which is analytic and leads to straightforward formulas, allows us to understand the structure of the correlations, in particular to identify the component related to the fluctuation of the numbers of sources and the component from the length fluctuations. We also present the results in terms of the expansion in the basis of the Legendre polynomials. A number of further effects is discussed, such as smearing of the pseudorapidity distributions or resonance decays. Our results reproduce qualitatively and semiquantitatively the basic features of the recent measurements at the LHC.
description: 12 pages, 11 figures
Experimental Test of Heat Recovery in Silicon Solar Cells with Thermoelectric Materials
Creators: name: Kamide, K.
name: Mochizuki, T.
name: Sakuma, J.
name: Akiyama, H.
name: Takato, H.
Publisher: name: WIP
Year: 2021
Subjects: New Materials and Concepts for Photovoltaic Devices
Fundamental Studies

description: 38th European Photovoltaic Solar Energy Conference and Exhibition; 37-40
description: Installation environments of solar cells are surrounded by heat, which are also exhausted from the cells themselves and degrade the device performance normally. Here we report an experiment to show that hybrid devices of silicon solar cells and commercial thermoelectric materials, bismuth telluride, can recover heat to exhibit a positive temperature characteristic, i.e., the output power increases with the solar cell temperature. The result implies the hybrid structure can be another type of realization for our concept of “heat recovery solar cell”, namely the type II (HERC-II).
"Christen ohne Kirche" - Gedanken zu einem Buch von Leszek Kolakowski
Creators: name: Beaude, Joseph
Publisher: name: Concilium
Year: 1970

description: Concilium, Bd. 7 Nr. 11 (1971): Concilium: Internationale Zeitschrift für Theologie, Band 7, Heft 11
On the Non-Ideal Diode Factor in Solar Cells and the Existence of Multiple Quasi-Fermi Levels
Creators: name: Ramiro, I.
name: Linares, P.G.
name: Martí, A.
Publisher: name: WIP
Year: 2021
Subjects: New Materials and Concepts for Photovoltaic Devices
Fundamental Studies

description: 38th European Photovoltaic Solar Energy Conference and Exhibition; 41-44
description: The diode ideality factor is a key parameter for understanding the recombination mechanisms that dominate in a solar cell. This factor is usually assumed to be in the range 1-2. Values greater than 2 are generally considered anomalous since there is not a clear explanation for them. In this work, we develop a simple m-level expansion of the Shockley-Read-Hall model for recombination in a p-n junction. Our model can account for ideality factors as high as m+1. In the light of this model, we analyze and explain the temperature dependence of the ideality factor of a GaSb/GaAs quantum-dot intermediate band solar cell.
Picturesque Victoria, British Columbia
Creators: name: :Unav
Publisher: name: University of Victoria Libraries
Year: 2020
Subjects: subject: Cities and towns
valueUri: http://id.worldcat.org/fast/861748
subject: City and town life
valueUri: http://id.worldcat.org/fast/862081
subject: Landscapes
valueUri: http://id.worldcat.org/fast/1735625
subject: Pictorial works
valueUri: http://id.worldcat.org/fast/1423874

description: Consists of black and white photographs of Victoria and environs, including the harbour, the Esquimalt naval station, and Cadboro Bay.
Deformability-based circulating tumor cell separation with conical-shaped microfilters: concept, optimization and design criteria
Creators: name: Aghaamoo, Mohammad
name: Zhang, Zhifeng
name: Chen, Xiaolin
name: Xu, Jie
Publisher: name: arXiv
Year: 2016
Subjects: subject: Cell Behavior (q-bio.CB)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: The ability of detecting and separating CTCs can play a key role in early cancer detection and treatment. In recent years, there has been growing interest in using deformability-based CTC separation microfilters due to their simplicity and low cost. Most of previous studies in this area are mainly based on experimental work. Although experimental research provides useful insights in designing CTC separation devices, there is still a lack of design guidelines based on fundamental understandings of the cell separation process in the filers. While experimental efforts face challenges especially microfabrication difficulties, we adopt numerical simulation here to study conical-shaped microfilters using deformability difference between CTCs and blood cells for separation process. We use liquid drop model for modeling a CTC passing through such microfilters. The accuracy of the model in predicting the pressure signature of the system is validated by comparing with previous experiments. Pressure-deformability analysis of the cell going through the channel is then carried out in detail in order to better understand how a CTC behaves throughout the filtration process. Different system design criteria such as system throughput and unclogging of the system are discussed. Specifically, pressure behavior under different system throughput is analyzed. Regarding the unclogging issue, we define pressure ratio as a key parameter representing the ability to overcome clogging in such CTC separation devices and investigate the effect of conical angle on the optimum pressure ratio. Finally, the effect of unclogging applied pressure on the system performance is examined. Our study provides detailed understandings of the cell separation process and its characteristics, which can be used for developing more efficient CTC separation devices.
The Potential of Glass-Fibre-Reinforcement: (Thermo-)Mechanical Testing of Light-Weight PV Modules
Creators: name: Govaerts, J.
name: Moliya, K.
name: Luo, B.
name: Borgers, T.
name: Van Dyck, R.
name: Van Der Heide, A.S.H.
name: Tous, L.
name: Morlier, A.
name: Lisco, F.
name: Cerasti, L.
name: Galiazzo, M.
name: Poortmans, J.
Publisher: name: WIP
Year: 2021
Subjects: New Materials and Concepts for Photovoltaic Devices
New Materials and Concepts for Cells and Modules

description: 38th European Photovoltaic Solar Energy Conference and Exhibition; 24-27
description: In this work we report on our approach on integrating c-Si PV into lightweight structures, in particular towards vehicle integration. To this end we want to get rid of the (bulk weight of the) glass but seek a suitable replacement in terms of mechanical stability. First we elaborate on the most basic standards and norms that VIPV products should relate to in terms of (thermo-)mechanical testing. Then, for the experimental part, 2 concepts are investigated. In a first approach, we reinforced the encapsulant with glass fibre material, while in a second one we applied a dedicated glass-fibre-reinforced sheet as a replacement of the backsheet. In both cases we stay as close as possible to using commercially available material. Extending our previously reported work, we then elaborate for each approach the testing that has been carried out so far, and what is still ongoing and being planned in the short-term future (before the conference): indicating the promising results so far on thermal cycling and vibration testing, the hail impact testing is a challenge to be tackled still
Micromechanics-Based Simulations of Compressive and Tensile Testing on Lime-Based Mortars
Creators: name: Nežerka, Václav
name: Nemeček, Jiří
name: Zeman, Jan
Publisher: name: arXiv
Year: 2015
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The purpose of this paper is to propose a continuum micromechanics model for the simulation of uniaxial compressive and tensile tests on lime-based mortars, in order to predict their stiffness, compressive and tensile strengths, and tensile fracture energy. In tension, we adopt an incremental strain-controlled form of the Mori-Tanaka scheme with a damageable matrix phase, while a simple $J_2$ yield criterion is employed in compression. To reproduce the behavior of lime-based mortars correctly, the scheme must take into account shrinkage cracking among aggregates. This phenomenon is introduced into the model via penny-shaped cracks, whose density is estimated on the basis of a particle size distribution combined with the results of finite element analyses of a single crack formation between two spherical inclusions. Our predictions show a good agreement with experimental data and explain the advantages of compliant crushed brick fragments, often encountered in ancient mortars, over stiff sand particles. The validated model provides a reliable tool for optimizing the composition of modern lime-based mortars with applications in conservation and restoration of architectural heritage.
description: 21 pages, 12 figures, 1 table
Data-based analysis of nanoporous metals: from microstructural features to structure-property relationships
Creators: name: Richert, Claudia
Publisher: name: TUHH Universitätsbibliothek
Year: 2023
Subjects: subject: nanoporous metals
subject: mechanical properties
subject: microstructure
subject: descriptors
subject: ligament shape
subject: finite element simulation
classificationCode: 620
subject: Engineering

description: In this thesis, a comprehensive workflow for an FE beam modeling approach was developed, which allows to predict the macroscopic elastic and plastic mechanical behavior of nanoporous structures. An in-depth characterization of various geometrical and topological descriptors provided detailed insights about the comparability of experimental nanoporoug gold and computer-generated structures. The combination of the macroscopic mechanical predictions by FE simulations and the structural descriptors derived for the over one hundred computer-generated structures enabled to propose an improved scaling law.
description: In dieser Arbeit wurde ein umfassender FE-Balken Modellierungsansatz entwickelt, der es ermöglicht, das makroskopische elastische und plastisch mechanische Verhalten von nanoporösen Strukturen vorherzusagen. Eine ausführliche Charakterisierung verschiedener geometrischer und topologischer Deskriptoren der Mikrostruktur lieferte detaillierte Informationen über die Vergleichbarkeit von experimentellem nanoporösen Gold und computergenerierten Strukturen. Die Kombination der mechanischen Vorhersagen durch FE-Simulationen und der Deskriptoren der computergenerierten Strukturen ermöglichte es, ein verbessertes Skalierungsgesetz herzuleiten.
Solder Paste for Interconnecting Structured Ribbons on the Back Side of the c-Si Cells
Creators: name: Pujari, N.S.
name: Krithika, P.M.
name: Sarkar, S.
name: Bilgrien, C.
Publisher: name: WIP
Year: 2021
Subjects: New Materials and Concepts for Photovoltaic Devices
New Materials and Concepts for Cells and Modules

description: 38th European Photovoltaic Solar Energy Conference and Exhibition; 28-31
description: We report tin-lead (Sn-Pb) and low temperature lead free solder pastes for interconnecting structured ribbons. Lead free option was tin-bismuth (Sn-Bi) based engineered non eutectic alloy HRL1. We found an acceptable wettability and printability of both the solder pastes. These pastes show excellent stability, long stencil life and consistent transfer efficiency (>90 %). Solder joints were strong with peel strength more than 2N/mm and voiding less than 10 %, indicating bonds have better contacts and complete wetting. We found that solder paste based assemblies yield uniform intermetallic compound (IMC) formation and no loss in power output. Both pastes could be fast reflowed and laminated with EVA. The modules assembled using these pastes pass thermal-cycling and damp heat reliability testing according to IEC61215. Our results suggests that solder pastes could be an attractive alternative to expensive electrically conductive adhesives for interconnecting structured ribbons.
Enhancing the Performance of Luminescent Solar Concentrator Photovoltaic Devices Using Multiple Organic Dyes and Bifacial Silicon Solar Cells
Creators: name: Desai, N.
name: Aghaei, M.
name: Reinders, A.H.M.E.
Publisher: name: WIP
Year: 2021
Subjects: New Materials and Concepts for Photovoltaic Devices
New Materials and Concepts for Cells and Modules

description: 38th European Photovoltaic Solar Energy Conference and Exhibition; 32-36
description: This study presents a novel configuration for luminescent solar concentrator photovoltaic (LSC-PV) devices using a mixture of multiple organic luminophores namely, Perylene Green, Lumogen Red 305, and Lumogen Orange 240. This LSC-PV device includes a cubical lightguide with a dimension of 10× 10×10 mm3 and made of poly (methyl methacrylate) (PMMA), containing a mixture of two or three perylene dyes. The mono-crystalline silicon bifacial solar cells (mono c-Si) are mounted on the edges and bottom sides of this device. This study evaluates the optical efficiency (OE) and power conversion efficiency (PCE) of four different configurations of LSC-PV devices with variations of mixed luminescent dyes in order to obtain the highest performance and optimal structure for the combination of dyes. For this purpose, a Monte Carlo ray tracing simulation is conducted in LightTools software to explore the effect of multiple luminescent dyes on the optical performance of LSC-PV devices and analyse the incident irradiance on the front and rear sides of edges- and bottom-mounted bifacial solar cells. The comparison results show that the highest theoretical optical efficiency is 88.2% under standard test conditions (STC) for an LSC-PV device containing a mixture of Lumogen Orange 240 and Perylene Green dye at 10 ppm. The theoretical power conversion efficiency is then 17.7%.
The Assessment of Reverse Logistics on Plastic Manufacturing Companies Located in Addis Ababa
Creators: name: Biru, Tsega
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2017

description: Reverse logistics is an important process that is often misunderstood. Many organizations do not understand what processes and procedures to follow and how to manage reverse logistics efficiently. The aim of this study is to assess reverse logistic practices in plastics manufacturing companies located in Addis Ababa.To address this study descriptive analysis method was employed. To gather data for the study questionnaire and interview have been used. The analysis was depending on the data obtained from the different respective organization like ministry of trade.Data analysis is by using SPSS (Statistical Package for Social Sciences) to explain, understand and summarize the data that will be collected. Descriptive statistics like mean, frequency and percentile to analyze respondent background and related issues
Effect of water vapor on the performance of glass RPCs in avalanche mode operation
Creators: name: Raveendrababu, K.
name: Behera, P. K.
name: Satyanarayana, B.
name: Mukhopadhayay, S.
name: Majumdar, N.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We studied the effect of water vapor on the performance of glass Resistive Plate Chambers (RPCs) in the avalanche mode operation. Controlled and calibrated amount of water vapor was added to the RPC gas mixture that has C$_2$H$_2$F$_4$ as the major component. The deterioration in the performance of RPC was observed while operating with wet gas and recovered after switching to standard gas.
Progress in Three-Terminal Heterojunction Bipolar Transistor Solar Cells
Creators: name: Antolín, E.
name: Zehender, M.H.
name: Svatek, S.A.
name: Steiner, M.A.
name: Martinez, M.
name: Garcia, I.
name: García-Linares, P.
name: Warren, E.L.
name: Tamboli, A.C.
name: Martí, A.
Publisher: name: WIP
Year: 2021
Subjects: New Materials and Concepts for Photovoltaic Devices
New Materials and Concepts for Cells and Modules

description: 38th European Photovoltaic Solar Energy Conference and Exhibition; 14-18
description: Conventional solar cells, including multijunction solar cells, are based on pn junctions as building blocks. In contrast, the three-terminal heterojunction bipolar transistor solar cell (3T–HBTSC) explores the use of a bipolar transistor structure to build a solar cell. The limiting efficiency of this transistor structure equals that of a double-junction solar cell. However, since the 3T–HBTSC does not require tunnel junctions, its minimal structure has only three semiconductor layers, while the minimal structure of a double junction solar cell has six. This work reviews the fundamental theory of this solar cell and the steps carried out towards its practical implementation.
Structural and Optical Study of Europium Doped ZnO FIlms Grown on Different Substrates
Creators: name: Gremenok, V.F.
name: Zaretskaya, E.P.
name: Stanchik, A.V.
name: Mudryi, A.V.
name: Khoroshko, V.V.
name: Pyatlitski, A.N.
name: Saladukha, V.A.
name: Piatlitskaya, T.V.
Publisher: name: WIP
Year: 2021
Subjects: New Materials and Concepts for Photovoltaic Devices
New Materials and Concepts for Cells and Modules

description: 38th European Photovoltaic Solar Energy Conference and Exhibition; 19-23
description: It is well known that rare-earth (RE) ions (erbium, terbium, europium, thulium and so on) are a special kind of photoactive centers with narrow emission lines and long emission lifetimes in various semiconductor materials, including ZnO. In the present work, the influence of europium ions (Eu3+) on the physical properties of ZnO films was investigated. Thin films were fabricated on quartz and p-Si (100) substrates by magnetron sputtering method at 25 ºC. The samples have been annealed at temperature from 400 to 600 °C. X-ray measurements were performed to confirm the crystallinity and phase composition of the films. Morphology and chemical composition of the films were studied using scanning electron microscopy and energy dispersive x-ray spectroscopy, respectively. Particularly, the ZnO:Eu films on silicon substrates exhibit large-scale grain size about of ~ 0.1 - 0.3 μm. The optical characteristics of the samples on glass substrates were obtained from the transmission and reflection spectra. Using photoluminescence (PL) and photoluminescence excitation (PLE) methods are found that ZnO:Eu films exhibit bright red emission which may be useful for the additional generation of nonequilibrium charge carriers in the films. The results presented in this work are important to develop energy efficient solid state lighting devices.
Optimization of Carbon-Nanotube-Reinforced Composite Gridlines towards Commercialization
Creators: name: Chavez, A.
name: Rummel, B.
name: Dowdy, N.
name: Han, S.M.
name: Bosco, N.
name: Rounsaville, B.
name: Rohatgi, A.
Publisher: name: WIP
Year: 2021
Subjects: New Materials and Concepts for Photovoltaic Devices
New Materials and Concepts for Cells and Modules

description: 38th European Photovoltaic Solar Energy Conference and Exhibition; 7-9
description: Solar cells in PV modules crack during field operation, which exposes the modules to environmental stressors, including extreme weather events, such as hailstorms and hurricanes. These cracks gradually lead to power degradation. To directly address the cell-crack-induced degradation, we have reinforced the traditional screen printable silver paste, commonly used throughout the industry for front side contacts, with low-cost multiwalled carbon-nanotubes. We have shown in previous work that these metal matrix composites have little to no effect on the cell’s efficiency while enhancing the metallization’s fracture toughness and electrical gap-bridging capability. In this work, we focus on optimizing the composite metallization to achieve the best possible performance. We discover that reducing carbon nanotube agglomerations in the paste not only improves the printability for narrow gridlines, but also increases the modulus of toughness of the metallization by over 500%.