615 research outputs found
Levenscyclusanalyse groencompost: grootschalig en zelf composteren.
Door PPO-AGV is in 2009 een studie uitgevoerd om in een levenscyclusanalyse (LCA) de bereiding van groencompost op het agrarisch bedrijf te vergelijken met de bereiding van groencompost op regioschaal door gespecialiseerde composteerbedrijven.
Bereiding van groencompost op het agrarisch bedrijf heeft het voordeel dat flink bespaard kan worden op energieverbruik en vrachtvervoer op de weg. Daar staat tegenover dat gespecialiseerde groencomposteerders gebruik kunnen maken van schaalgroottevoordelen, betere sturing kunnen geven aan gewenste composteercondities en dat zij gebruik kunnen maken van groenafval van natuurgebieden. De studie bouwt voort op de studie die in 2008 is uitgevoerd, waarbij o.a. een LCA voor GFT-compost is opgesteld. Voor zover dat mogelijk is, zijn de kengetallen voor de bereiding van groencompost vergeleken met die van GFTcompost
Palladium-Catalyzed Conjugate Addition of Arylboronic Acids to β,β-Disubstituted Enones in Aqueous Media: Formation of Bis-benzylic and ortho-Substituted Benzylic Quaternary Centers
Palladium-catalyzed conjugate addition of arylboronic acids to β,β-disubstituted enones in aqueous media is reported. Additions of a wide range of arylboronic acids to β,β-disubstituted enones occur to form ketone products bearing benzylic all-carbon quaternary centers. These reactions are promoted by a simple catalyst prepared from palladium trifluoracetate and 2,2′-bipyridine. The use of aqueous sodium trifluoracetate as the reaction medium significantly enhances reactivity and enables the formation of challenging bis-benzylic and ortho-substituted benzylic all-carbon quaternary centers
Palladium-Catalyzed Synthesis of N-tert-Prenylindoles
Palladium-catalyzed N-tert-prenylations of indoles, tricarbonylchromium-activated indoles, and indolines that occur in high yields (up to 94%) with high tert-prenyl-to-n-prenyl selectivity (up to 12:1) are reported
A Virtual Conversational Agent for Teens with Autism: Experimental Results and Design Lessons
We present the design of an online social skills development interface for
teenagers with autism spectrum disorder (ASD). The interface is intended to
enable private conversation practice anywhere, anytime using a web-browser.
Users converse informally with a virtual agent, receiving feedback on nonverbal
cues in real-time, and summary feedback. The prototype was developed in
consultation with an expert UX designer, two psychologists, and a pediatrician.
Using the data from 47 individuals, feedback and dialogue generation were
automated using a hidden Markov model and a schema-driven dialogue manager
capable of handling multi-topic conversations. We conducted a study with nine
high-functioning ASD teenagers. Through a thematic analysis of post-experiment
interviews, identified several key design considerations, notably: 1) Users
should be fully briefed at the outset about the purpose and limitations of the
system, to avoid unrealistic expectations. 2) An interface should incorporate
positive acknowledgment of behavior change. 3) Realistic appearance of a
virtual agent and responsiveness are important in engaging users. 4)
Conversation personalization, for instance in prompting laconic users for more
input and reciprocal questions, would help the teenagers engage for longer
terms and increase the system's utility
Measurement-induced focusing and the magnitude of loss aversion:The difference between comparing gains to losses and losses to gains
Research has identified loss aversion as a strong and robust phenomenon, but has also revealed some moderators affecting the magnitude of its effect on decision making. In the current article, we draw attention to the fact that even the measurement of loss aversion itself may affect its magnitude by inducing a focus on either losses or gains. In three studies, we provide empirical evidence for such a measurement-induced focus. In all studies we used coin-toss gambles---in which there is a 50/50 chance to win or to lose---to assess gain/loss ratios as a measure of loss aversion. Participants either filled out the loss side or the gain side of this gain/loss ratio. The studies consistently showed that---using within- and between-subject designs and anticipated and real coin-toss gambles---the strength of loss aversion depended on the measurement format (fill-in-the-loss versus fill-in-the-gain); filling in the loss side increased loss aversion. Moreover, loss aversion was more affected by the stakes of the gamble in the fill-in-the-loss format than in the fill-in-the-gain format
Subdominant modes and optimization trends of DIII-D reverse magnetic shear configurations
Alfven Eigenmodes and magneto-hydrodynamic modes are destabilized in DIII-D
reverse magnetic shear configurations and may limit the performance of the
device. We use the reduced MHD equations in a full 3D system, coupled with
equations of density and parallel velocity moments for the energetic particles
(with gyro-fluid closures) as well as the geodesic acoustic wave dynamics. The
aim of the study consists in finding ways to avoid or minimize MHD and AE
activity for different magnetic field configurations and neutral beam injection
operational regimes. The simulations show at the beginning of the discharge,
before the reverse shear region is formed, a plasma that is AE unstable and
marginally MHD stable. As soon as the reverse shear region appears, ideal MHD
modes are destabilized with a larger growth rate than the AEs. Both MHD modes
and AEs coexist during the discharge, although the MHD modes are more unstable
as the reverse shear region deepens. The simulations indicate the
destabilization of Beta induced AE, Toroidal AE, Elliptical AE and Reverse
Shear AE at different phases of the discharges. A further analysis of the NBI
operational regime indicates that the AE stability can be improved if the NBI
injection is off axis, because on-axis injection leads to AEs with larger
growth rate and frequency. In addition, decreasing the beam energy or
increasing the NBI relative density leads to AEs with larger growth rate and
frequency, so an NBI operation in the weakly resonant regime requires higher
beam energies than in the experiment. The MHD linear stability can be also
improved if the reverse shear region and the q profile near the magnetic axis
are in between the rational surfaces q=2 and q=1, particularly if there is a
region in the core with negative shear, avoiding a flat q profile near the
magnetic axis
Subdominant modes and optimization trends of DIII-D reverse magnetic shear configurations
Alfvén Eigenmodes (AE) and magneto-hydrodynamic (MHD) modes are destabilized in DIII-D reverse magnetic shear configurations and may limit the performance of the device. We use the reduced MHD equations in a full 3D system, coupled with equations of density and parallel velocity moments for the energetic particles (with gyro-fluid closures) as well as the geodesic acoustic wave dynamics, to study the properties of instabilities observed in DIII-D reverse magnetic shear discharges. The aim of the study consists in finding ways to avoid or minimize MHD and AE activity for different magnetic field configurations and neutral beam injection (NBI) operational regimes. The simulations show at the beginning of the discharge, before the reverse shear region is formed, a plasma that is AE unstable and marginally MHD stable. As soon as the reverse shear region appears, ideal MHD modes are destabilized with a larger growth rate than the AEs. Both MHD modes and AEs coexist during the discharge, although the MHD modes are more unstable as the reverse shear region deepens. The simulations indicate the destabilization of Beta induced AE (BAE), Toroidal AE (TAE), elliptical AE (EAE) and reverse shear AE (RSAE) at different phases of the discharges, showing a reasonable agreement between the frequency range of the dominant modes in the simulations and the diagnostic measurements (...)This material based on work is supported both by
the U.S. Department of Energy, Office of Science, under
Contract DE-AC05-00OR22725 with UT-Battelle,
LLC and U.S. Department of Energy, Oce of Science,
Oce of Fusion Energy Sciences, using the DIII-D National
Fusion Facility, a DOE Oce of Science user facility, under Award No. DE-FC02-04ER54698. This research was sponsored in part by the Ministerio of EconomĂa y Competitividad of Spain under project no.ENE2015-68265-P. DIII-D data shown in this paper
can be obtained in digital format by following the links
at https://fusion.gat.com/global/D3D DMP.Publicad
Barriers for prosumers’ open business models: a resource-based view on assets and data-sharing in electricity markets
This article explores the barriers for open business models in support of sustainability in electricity markets. It puts forward privacy and data protection concerns about sharing prosumers’ physical assets as well as data due to to their critical role in decentralized modes of electricity/flexibility trading. In particular, it uses a multiple case study approach to identify actors’ resources, examine other interested actors in each resource, define their objectives, and consider privacy and data protection concerns of sharing prosumers’ physical assets and data. The findings yield new insights into sharing opportunities beyond electricity/flexibility trading. In doing so, our study contributes to theories of the firm by applying the resource-based view in a new context and to the business model literature by shedding light on barriers in applying open business models
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Gegevens in bijgaande tabellen: 1) Minimum em maximum temperatuur en relatieve luchtvochtigheid in de luchtlaag op 10 cm boven het grondoppervlak op de dag van toepassing van de middelen; 2) Gewicht per plant perzikkruid na bespuiting met vier doseringen Basagra
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