13 Works

SVACH - Development of advanced smart ventilation controls for residential applications

Brennan Less, Iain Walker, David Lorenzetti & Michael Sohn
This study examined the use of zoned ventilation systems using a coupled CONTAM/EnergyPlus model for new California dwellings. Several smart control strategies were developed with a target of halving ventilation-related energy use, largely through reducing dwelling ventilation rates based on zone occupancy. The controls were evaluated based on the annual energy consumption relative to continuously operating non-zoned, code-compliant mechanical ventilation systems. The systems were also evaluated from an indoor air quality perspective using the equivalency...

Closing the life cycle of forest trees: The difficult dynamics of seedling-to-sapling transitions in a subtropical rain forest

Chia-Hao Chang-Yang, Jessica Needham, Chia-Ling Lu, Chang-Fu Hsieh, I-Fang Sun & Sean McMahon
1. Experimental and observational studies on seedling dynamics posit mechanisms that can influence forest diversity, structure, and function. However, high mortality and slow growth of seedlings make it difficult to evaluate the importance of this life-history filter to total tree life history. Quantifying the duration and transition of the seedling phase would help us understand this ‘black box’ in tree population biology. 2. We used a 16-year dataset of comprehensive seedling-to-sapling demography from a subtropical...

Simulation of sheared granular layers activated by fluid pressurization

Nho Gia Hien Nguyen, Luc Scholtès, Yves Guglielmi, Frédéric Victor Donzé, Zady Ouraga & Mountaka Souley
Fluid pressurization of critically stressed sheared zones can trigger slip mechanisms at play in many geological rupture processes, including earthquakes or landslides. The increasing fluid pressure reduces the effective stress, giving possibility to the shear zone to reactivate. Nonetheless, the mechanisms that dictate the mode of slip, from aseismic steady creep to seismic dynamic rupture, remain poorly understood. By using discrete element modeling, we simulate pore-pressure-step creep test experiments on a sheared granular layer under...

X-ray diffraction data, crystallographic information file, infrared spectra, and LA-ICP-MS depthprofiles of davemaoite

Oliver Tschauner, Shichun Huang, Shuying Yang, Munir Humayun, Wenjun Liu, Stephanie N. Gilbert Corder, Hans A. Bechtel, Jon Tischler & George R. Rossman
Calcium silicate perovskite, CaSiO3, is arguably the most geochemically important phase in the lower mantle, because it concentrates elements that are incompatible in the upper mantle, including the heat-generating elements thorium and uranium, which have half-lives longer than the geologic history of Earth. We report CaSiO3-perovskite as an approved mineral (IMA2020-12a) with the name davemaoite. The natural specimen of davemaoite proves the existence of compositional heterogeneity within the lower mantle. Our observations indicate that davemaoite...

The H2020 REFLECT project: Deliverable 4.1 - User’s Guide of a Coupled Hydro-Thermal-Chemical Code for Fluids

Saideep Pavuluri, Laurent Andre, Christophe Tournassat, Francis Claret & Cyprien Soulaine
This document presents the developed code, porousMedia4Foam, an open-source hydrogeochemical package that can decipher fluid flow and chemical reactive processes occurring within multi- {scale, dimensional, phase, compositional} environments. This report gives details regarding the installation of porousMedia4Foam, running the first simulations and describing many application cases in single-phase and multiphase systems.

Shade alters grass growth and architecture by reducing root biomass

Cedrique Solofondranohatra, Maria Vorontsova, Rebecca Dewhirst, Claire Belcher, Stuart Cable, Vololoniaina Jeannoda & Caroline Lehmann
Variable tree cover characterizes tropical grassy biomes. Light availability in the ground layer becomes increasingly limited as tree cover increases while open canopy environments are associated with a flammable grassy ground layer. Grass species dominating the ground layer of these ecosystems have adopted strategies to persist and proliferate with frequent fire. However, there is limited understanding of how grass growth and flammability traits respond to changes in light availability. We experimentally grew 14 grass species...

A Benchmark Data Set for Hydrogen Combustion

Akshaya Das, Christopher J. Stein, Farnaz Heidar-Zadeh, Luke Bertels, Meili Liu, Xingyi Guan, Mojtaba Haghighatlari, Jie Li, Oufan Zhang, Hongxia Hao, Itai Leven, Martin Head-Gordon & Teresa Head-Gordon

Data from: Whole-organism 3D quantitative characterization of zebrafish melanin by silver deposition micro-CT

Spencer Katz, Maksim Yakovlev, Daniel Vanselow, Yifu Ding, Alex Lin, Dilworth Parkinson, Yuxin Wang, Victor Canfield, Khai Ang & Keith Cheng
Melanin-rich zebrafish melanophores are used to study pigment development, human skin color, and as a large-scale screening phenotype. To facilitate more detailed whole-body, computational analyses of melanin content and morphology, we have combined X-ray microtomography (micro-CT), a non-destructive, full-volume imaging modality, with a novel application of ionic silver staining to characterize melanin distribution in whole zebrafish larvae. Normalized micro-CT reconstructions of silver-stained fish consistently reproduced pigment patterns seen by light microscopy, and allowed direct quantitative...

Desulfovibrio vulgaris Hildenborough Genetic Constructs

Judy Wall, Grant Zane, Thomas Juba, Jennifer Kuehl, Jayashree Ray, Swapnil Chhabra, Valentine Trotter, Maxim Shatsky, Kara De Leon, Kimberly Keller, Kelly Bender, Gareth Butland, Adam Arkin & Adam Deutschbauer
The dissimilatory sulfate-reducing Deltaproteobacterium, Desulfovibrio vulgaris Hildenborough (ATCC 29579), was chosen by the LBNL-led research collaboration ENIGMA to explore tools and protocols for bringing this anaerobe to model status. Here we describe a collection of genetic constructs generated by ENIGMA, which are available to the research community.

Drainage Canals in Southeast Asian Peatland

Nathan Dadap, Alison M Hoyt, Alexander R Cobb, Doruk Oner, Mateusz Kozinski, Pascal V Fua, Krishna Rao, Charles F Harvey & Alexandra G Konings
These images depict drainage canals and roads in peatlands in Borneo, Sumatra, and Peninsular Malaysia at 5 meter resolution. These canals were detected from July-September 2017 Planet Basemaps satellite imagery using a convolutional neural network. Please contact Nathan Dadap (ndadap@stanford.edu) with any questions.

Data from: A reusable pipeline for large-scale fiber segmentation on unidirectional fiber beds using fully convolutional neural networks

Alexandre Fioravante De Siqueira, Stéfan Van Der Walt & Daniela Mayumi Ushizima
Fiber-reinforced ceramic-matrix composites are advanced materials resistant to high temperatures, with application to aerospace engineering. Their analysis depends on the detection of embedded fibers, with semi-supervised techniques usually employed to separate fibers within the fiber beds. Here we present an open computational pipeline to detect fibers in ex-situ X-ray computed tomography fiber beds. To separate the fibers in these samples, we tested four different architectures of fully convolutional neural networks. When comparing our neural network...

Data from: String phase in an artificial spin ice

Xiaoyu Zhang, Ayhan Duzgun, Yuyang Lao, Shayaan Subzwari, Nicholas Bingham, Joseph Sklenar, Hilal Saglam, Justin Ramberger, Joseph Batley, Justin Watts, Daniel Bromley, Rajesh Chopdekar, Liam O'Brien, Chris Leighton, Cristiano Nisoli & Peter Schiffer
The appearance of one-dimensional strings of local excitations represents an interesting feature of the physical behavior of strongly correlated topological quantum matter. Here we demonstrate that strings of local excitations can also describe the physics of a classical thermal system of interacting nanomagnets, the Santa Fe Ice geometry of artificial spin ice. We measure the moment configuration of the nanomagnets, both after annealing near the ferromagnetic Curie point and in a thermally dynamic state. While...

Climate-driven limits to future carbon storage in California's wildland ecosystems

Shane Coffield, Kyle Hemes, Charles Koven, Michael Goulden & James Randerson
Enhanced ecosystem carbon storage is a key component of many climate mitigation pathways. The State of California has set an ambitious goal of carbon neutrality by 2045, relying in part on enhanced carbon sequestration in natural and working lands. We used statistical modeling, including random forests and climate analogues, to explore the climate-driven challenges and uncertainties associated with the goal of long-term carbon sequestration in forests and shrublands. We found that seasonal patterns of temperature...

Registration Year

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Affiliations

  • Lawrence Berkeley National Laboratory
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  • Stanford University
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  • University of California, Berkeley
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  • National Sun Yat-sen University
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  • National Dong Hwa University
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  • Royal Botanic Gardens
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  • Wayne State University
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  • University of Minnesota
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  • University of Clermont Auvergne
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  • Institut des Sciences de la Terre
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