1. Constructal Law of Design and Evolution in Nature

    01:27:55

    from LBNL Earth Sciences Division / Added

    171 Plays / / 0 Comments

    www.constructal.org The reoccurring patterns of nature have long puzzled even the most devoted proponents of chance and Darwin’s theory of evolution. But the Constructal Law changes the terms of this debate, and shows that a single law of physics governs the “design” behind everything that moves―whether animate or inanimate. According to the Constructal law, shapes and structures arise because they facilitate movement, in animal design, river basin design, traffic patterns, social dynamics, and technology and sports evolution.

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    • Deer at LBNL

      00:48

      from Julius Seizure / Added

      21 Plays / / 0 Comments

      Deer outside my office at Lawrence Berkeley National Laboratory

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      • DSSS: Determining chemical and microbial Fe(II) oxidation kinetics in situ: How well do organisms compete with chemical oxidatio

        01:03:12

        from LBNL Earth Sciences Division / Added

        27 Plays / / 0 Comments

        ESD welcomes George W. Luther, Ph.D. (Univ. of Delaware) The oxidation of aqueous Fe(II) to Fe(III) solids is of great significance to Earth history including banded iron formation (BIFs) and the rise of O2 in waters and the atmosphere. The chemical oxidation of aqueous Fe(II) in air saturated solutions is facile at circumneutral pH, but O2 arises mainly from photosynthetic activity. There are currently three theories on how microbes could have contributed to Fe(III) precipitation: (1) oxygenic photosynthesis, coupled to abiotic Fe oxidation, (2) aerobic (anerobic?) Fe oxidation by iron oxidizing bacteria (FeOB), and (3) anoxygenic photosynthesis, with Fe as an electron donor (photoferrotrophs). Using kinetic data obtained in the field as well as in the laboratory with in situ microelectrode techniques developed in our lab, it is now possible to discriminate between chemical Fe(II) oxidation and these microbially based processes in real time. Field data will be shown from diverse sites including Yellowstone National Park where groundwater, rich in Fe(II) and Mn(II) but with little or no O2, enter oxygenated systems. In the case of FeOB, their importance in Fe(II) oxidation increases at low O2 concentrations. Thermodynamic calculations for the first electron transfer between the metal ions, Fe(II) and Mn(II),with O2 over pH gives insight to the distribution of these metals in BIFs and their biogeochemical behavior.

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        • DSSS Enick video

          01:23:45

          from LBNL Earth Sciences Division / Added

          22 Plays / / 0 Comments

          Bob Enick, Ph.D. (University of Pittsburgh). Microorganisms have existed on this planet for more than 3.6 billion years and represent the major drivers for the global biogeochemical cycles. There are about 1030 bacteria in the world, but just 1021 stars in the universe. It is clear that the microbial diversity of the world is a scientific frontier that is not only unexplored, but also of far greater than astronomical dimensions. The microbial ecology of The Arctic is intrinsically fascinating: the low temperatures, extreme seasonality are striking and yet this is a biologically active environment in which nutrients are turned over and pollutants are degraded. The study of the Arctic has gained new urgency as the most rapidly warming region on the planet. The microbial world will mediate much of the anticipated change. There is a ticking “bomb” buried in the Arctic tundra. Enormous quantities of naturally occurring greenhouse gasses are trapped in ice-like structures (clathrates) in the tundra and at the bottom of the seas. The microbial community is central to one of the most disturbing aspects of this warming: the fate of the 400 gigatons of methane locked in the frozen arctic tundra. The microbial community constitutes a lock, currently in a closed position, on these reserves of carbon and the fate of this reservoir. It is correspondingly desirable to understand the nature of this lock, which in turn implies a predictive understanding of the microbial ecology of Arctic soils in our present environment and in a putative and uncertain warmer future.

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          • DSSS: Hydraulic Fracturing: Theory – Reality – Uncertainty

            01:40:23

            from LBNL Earth Sciences Division / Added

            199 Plays / / 0 Comments

            ESD welcomes Maurice Dusseault, Ph.D. (Univ. of Waterloo) Hydraulic fracturing (HF) has emerged as an important enabling technique in development of shale oil and shale gas, geothermal energy exploitation, and slurried solids disposal at depth. For example, the City of Los Angeles is injecting biosolids sludge on a trial basis into a depleted reservoir 1350 m deep under HF conditions as a means of treatment, with potential for harvesting generated methane. The challenge facing the geomechanics community is development of a deep understanding and analysis methods for HF in naturally fractured (jointed) rock masses such as igneous rocks, petroliferous carbonates, and shale oil and shale gas reservoirs. Scale is critical: at the tip, local fabric dominates propagation; when fracture length is large, global propagation is dominated by the large-scale principal compressive stresses. Fluid density, viscosity and injection rate affect propagation, and in many cases, induced displacements can change the local principal stress values and lead to secondary fracture arms, an important factor in developing fracture networks. Maurice will discuss what we can and cannot yet do in HF simulation and design. Changes of direction, stress alterations, buoyancy effects, and stress field variations in situ will be discussed. There are no easy answers, the goal of the talk will be to cast some clarity on the physical mechanisms involved in hydraulic fracturing in rock masses with strong fabric, and see what options are available for engineers to pursue in design and implementation of HF technologies.

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            • DSSS: Is Brevity the Soul of Soil Models?

              01:08:17

              from LBNL Earth Sciences Division / Added

              39 Plays / / 0 Comments

              ESD welcomes Eric A. Davidson, Ph.D. (Woods Hole Research Center, MA). Soils carbon stocks are 2-4 times greater than atmospheric CO2-C and 3-6 times larger than aboveground plant biomass-C. Potential exists for C sequestration in soils, but there is also a large potential positive feedback to climate change as permafrost thaws and enzymatic decomposition of soil organic matter increases with warming. Enzymatic reaction rates are temperature sensitive when substrate is not limiting. However, substrate supply often, perhaps usually, limits enzymatic reaction rates in soils. Soil microbial community composition varies temporally and spatially, and the reactive properties of extracellular enzymes also can probably be changed by microorganisms in response to environmental cues. The C, N, and P assimilation enabled by extracellular enzyme activity affects the growth of microbial populations, their metabolism, and their enzyme synthesis. Do models need to represent all of these processes in 3-D space and in time? Ideally, the answer would be “yes,” but only if there is a viable approach to testing and validating model structures and parameterizations representing each process. When that is not possible, some aggregation is needed. A modular design enables progress on model components without losing sight of the way that components fit together. Admittedly, the Dual Arrhenius and Michaelis–Menten (DAMM) model does not yet attain all of these lofty goals, but it offers promise to build upon an integrated, modular approach to represent as parsimoniously as possible numerous key interacting processes in a heterogeneous matrix, and to keep making improvements until we get the DAMM thing right.

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              • DSSS: Taking the Fingerprints of Global Sea Level Change

                01:13:22

                from LBNL Earth Sciences Division / Added

                49 Plays / / 0 Comments

                Sea level is a sensitive indicator of climate change, both in the modern world and across geological time. In this regard, all processes that contribute to observed sea-level changes, whether on plate tectonic time scales of millions of years, ice age time scales of thousands of years, or decadal time scales associated with recent global climate change, have distinct geometric signatures. Thus, insight into the underlying processes responsible for sea level change is fundamentally deepened when analyses move beyond simple global averages to consider the detailed geographic variation in geological or geodetic observations. In this talk I will consider examples of this insight from across a broad spectrum of time scales, but I will focus, in particular, on the fingerprints of sea level change in our progressively warming world.

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                • Energy-Efficient Supercomputing and Datacenters at Large Scale - 2011 Santa Barbara Summit on Energy Efficiency

                  01:28:32

                  from Institute for Energy Efficiency / Added

                  35 Plays / / 0 Comments

                  Energy-Efficient Supercomputing and Datacenters at Large Scale A preview of the next generation of supercomputers and the enormous challenge exascale supercomputers face with regard to energy efficiency. Moderator: Fred Chong, Computing Solutions Group Head, Institute for Energy Efficiency Horst Simon, Deputy Director, Lawrence Berkeley National Laboratory Pradeep Dubey, Senior Principal Engineer, Intel Bikash Koley, Senior Network Architect, Google

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                  • Goatlapse 2015: Lawnmowers of Berkeley Lab

                    01:15

                    from Joost Daniels / Added

                    179 Plays / / 0 Comments

                    Short video highlighting the now famous lawnmowing service and fire prevention crew at work at Lawrence Berkeley National Lab. Be sure to turn on the sound. Goat day came early this year! Last week a video about these goats went viral so I decided to throw together a short video with my own footage because apparently there are a lot of goat lovers out there. Thanks to these 500 goats, their herder and his dog, the risk of a grass fire at the lab is significantly reduced. Music: The Swingle Singers - Badinerie Thanks to Carlo for music selection, and to Mark and Dave for their help with timelapse camera positioning.

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                    • Hiking on the Lawrence Berkeley National Lab trail

                      01:20

                      from Julius Seizure / Added

                      18 Plays / / 0 Comments

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