The Hierarchical Equal Area isoLatitude Pixelation (HEALPix) scheme is used extensively in astrophysics for data collection and analysis on the sphere. The scheme was originally designed for studying the Cosmic Microwave Background (CMB) radiation, which represents the first light to travel during the early stages of the universe's development and gives the strongest evidence for the Big Bang theory to date. Refined analysis of the CMB angular power spectrum can lead to revolutionary developments in understanding the nature of dark matter and dark energy. In this paper, we present a new method for performing spherical harmonic analysis for HEALPix data, which is a central component to computing and analyzing the angular power spectrum of the massive CMB data sets. The method uses a novel combination of a non-uniform fast Fourier transform, the double Fourier sphere method, and Slevinsky's fast spherical harmonic transform (Slevinsky, 2019). For a HEALPix grid with $N$ pixels (points), the computational complexity of the method is $mathcal{O}(Nlog^2 N)$, with an initial set-up cost of $mathcal{O}(N^{3/2}log N)$. This compares favorably with $mathcal{O}(N^{3/2})$ runtime complexity of the current methods available in the HEALPix software when multiple maps need to be analyzed at the same time. Using numerical experiments, we demonstrate that the new method also appears to provide better accuracy over the entire angular power spectrum of synthetic data when compared to the current methods, with a convergence rate at least two times higher.

This work deals with the efficient numerical solution of the time-fractional heat equation discretized on non-uniform temporal meshes. Non-uniform grids are essential to capture the singularities of "typical" solutions of time-fractional problems. We propose an efficient space-time multigrid method based on the waveform relaxation technique, which accounts for the nonlocal character of the fractional differential operator. To maintain an optimal complexity, which can be obtained for the case of uniform grids, we approximate the coefficient matrix corresponding to the temporal discretization by its hierarchical matrix (${cal H}$-matrix) representation. In particular, the proposed method has a computational cost of ${cal O}(k N M log(M))$, where $M$ is the number of time steps, $N$ is the number of spatial grid points, and $k$ is a parameter which controls the accuracy of the ${cal H}$-matrix approximation. The efficiency and the good convergence of the algorithm, which can be theoretically justified by a semi-algebraic mode analysis, are demonstrated through numerical experiments in both one- and two-dimensional spaces.

The accurate assembly of the system matrix is an important step in any code that solves partial differential equations on a mesh. We either explicitly set up a matrix, or we work in a matrix-free environment where we have to be able to quickly return matrix entries upon demand. Either way, the construction can become costly due to non-trivial material parameters entering the equations, multigrid codes requiring cascades of matrices that depend upon each other, or dynamic adaptive mesh refinement that necessitates the recomputation of matrix entries or the whole equation system throughout the solve. We propose that these constructions can be performed concurrently with the multigrid cycles. Initial geometric matrices and low accuracy integrations kickstart the multigrid, while improved assembly data is fed to the solver as and when it becomes available. The time to solution is improved as we eliminate an expensive preparation phase traditionally delaying the actual computation. We eliminate algorithmic latency. Furthermore, we desynchronise the assembly from the solution process. This anarchic increase of the concurrency level improves the scalability. Assembly routines are notoriously memory- and bandwidth-demanding. As we work with iteratively improving operator accuracies, we finally propose the use of a hierarchical, lossy compression scheme such that the memory footprint is brought down aggressively where the system matrix entries carry little information or are not yet available with high accuracy.

An approach is given for solving large linear systems that combines Krylov methods with use of two different grid levels. Eigenvectors are computed on the coarse grid and used to deflate eigenvalues on the fine grid. GMRES-type methods are first used on both the coarse and fine grids. Then another approach is given that has a restarted BiCGStab (or IDR) method on the fine grid. While BiCGStab is generally considered to be a non-restarted method, it works well in this context with deflating and restarting. Tests show this new approach can be very efficient for difficult linear equations problems.

A system and method is described for use with a data grid cluster, which uses cluster quorum to prevent split brain scenario. The data grid cluster includes a plurality of cluster nodes, each of which runs a cluster service. Each cluster service collects and maintains statistics regarding communication flow between its cluster node and the other cluster nodes in the data grid cluster. The statistics are used to determine a status associated with other cluster nodes in the data grid cluster whenever a disconnect event happens. The data grid cluster is associated with a quorum policy, which is defined in a cache configuration file, and which specifies a time period that a cluster node will wait before making a decision on whether or not to evict one or more cluster nodes from the data grid cluster.

Routing methods for an integrated circuit design layout are disclosed. The layout can include design netlists and library cells. A multiple-level global routing can generate topological wire for each net. An area oriented graph-based detail routing on the design can be performed. A post route optimization after the detail routing can be performed to further improve the routing quality. Some methods can be single threaded all or some of the time, and/or multi-threaded some or all of the time.

User interfaces for displaying relationships between cells in a grid. In one example embodiment, a user interface includes a grid including rows and columns and a plurality of cells each having a specific position in the grid. A first one of the cells is related to a second one of the cells. The grid is configured to display, upon selection of the first cell or second cell, a visual representation of the relationship between the first cell and the second cell.

A method for estimating loss rates of links in a smart grid includes identifying end-to-end passage rates from a source to each of multiple receiver and/or load meters in a smart grid, and estimating a loss in at least one link of the grid by identifying the sparsest solution of link loss rates that matches the end-to-end passage rates. Also, a system includes a memory, a processor coupled thereto, and software modules executing on the processor, including a monitoring module for monitoring power flow of receiver and/or load meters in a smart grid, a measurement collector module for collecting measurements to compute end-to-end passage rates from a source to each receiver and/or load meter, and a processing module for estimating a loss in a link of the grid by identifying the sparsest solution of link loss rates matching the end-to-end passage rates.

Disclosed is a grid-connected inverter and a method for filtering AC output thereof. The grid-connected inverter includes an AC output filter which includes two or more switchable filtering modules, with the power capacity of each filtering module corresponding to a different output power of the grid-connected inverter; a monitoring module which is used to perform realtime monitoring on voltage and current outputted by the grid-connected inverter; and a control circuit which is used to calculate an output power grade of the grid-connected inverter according to the voltage and the current monitored by the monitoring module and control switching to the filtering module having a corresponding power capacity according to the power grade, the power grade being selected from a plurality of power grades which are divided according to power capacities of the filtering modules.

Monitoring and optimizing a state of an electrical grid are provided. An approach for synchronizing state information and context information, associated with one or more electrical devices on an electrical grid, with time information is provided. The state information is from one or more phasor measurement units (PMUs) associated with the one or more electrical devices, and the context information is from one or more third party servers. The approach further includes notifying one or more subscribing devices of the synchronized state information and the synchronized context information such that the one or more subscribing devices monitors and controls the one or more electrical devices based on the synchronized state information and the synchronized context information.

Methods and system for presenting a plurality of attributes of a plurality of players from a plurality of teams that are part of a league includes obtaining a plurality of attributes of the plurality of players and the plurality of teams. The plurality of attributes of the plurality of the players and of the teams is populated in one or more databases along with any updates to these attributes. The databases are queried to retrieve updated plurality of attributes of the plurality of players and the plurality of teams. A roster grid is generated for the plurality of teams for rendering at a client in substantial real time. The roster grid displays the updated status of the plurality of attributes of the plurality of players and the plurality of teams simultaneously in a clean, concise and effective manner.

An interlocking and removable tool for floral arranging, consisting of two interlocking pieces which form a sturdy grid when assembled. This grid is placed on top of a vase, jar, bowl, or other vessel used for housing arranged flowers. This grid keeps flowers in place while being arranged, without falling over, and allows the user to construct floral arrangements with ease. When the desired arrangement is complete, the interlocking components slide apart and are removed without disrupting the floral arrangement.

Systems and methods are described herein for managing the operations of a microgrid module. The microgrid module includes transformers and/or power converters necessary for modifying the input AC or DC power sources to meet the required characteristics of the output power. The microgrid module further comprises a power management software module and a control software module installed on a microgrid computer. The power management software module uses received business parameters to create rules for applying to the operation of the microgrid module. The rules are stored locally at the microgrid computer so that they can be quickly accessed by a control software module. The control software module uses the rules in combination with data collected from sensors installed in the physical circuitry layer of the microgrid module to control the operations of the microgrid module.

A system for distributing electric power to an electrical grid. The system includes a DC/AC inverter arranged to convert a DC voltage output from an electric power generator to an AC voltage, a transformer arranged to receive the AC voltage, transform the AC voltage and deliver the transformed AC voltage to the grid, and a connector arranged to selectively connect and disconnect the transformer from the grid. The DC/AC inverter is arranged to control primary winding magnetizing current delivered to the transformer. Further, the connector is arranged to selectively connect and disconnect the grid to and from the transformer on the basis of the controlled magnetizing current.

A land grid array (LGA) package including a substrate having a plurality of lands formed on a first surface of the substrate, a semiconductor chip mounted on a second surface of the substrate, a connection portion connecting the semiconductor chip and the substrate, and a support layer formed on part of a surface of a first land.

An improved grid for a nuclear reactor fuel assembly that has an egg-crate base grid as the primary support structure with each support cell of the base grid that supports a fuel rod having a lock-support sleeve that is rotatable within the support cell between a first and second orientation. In the first orientation the lock-support sleeve fits loosely within the support cell of the base grid and respectively, loosely receives the fuel rods that are loaded therein. The lock-support sleeves are then rotated to a second orientation that locks the fuel rods axially within the support cells.

A method for scheduling a charge of a plug-in electric vehicle (PEV) includes receiving, by a load management system, PEV information from a PEV plugged into an electric vehicle supply equipment (EVSE); transformer information from a transformer management system, the transformer information relating to a transformer associated with the EVSE; determining, by the charging information based on the PEV information and transformer information; providing the charging information to the PEV.

Methods, systems, and apparatus for aggregating electric power flow between an electric grid and electric vehicles are disclosed. An apparatus for aggregating power flow may include a memory and a processor coupled to the memory to receive electric vehicle equipment (EVE) attributes from a plurality of EVEs, aggregate EVE attributes, predict total available capacity based on the EVE attributes, and dispatch at least a portion of the total available capacity to the grid. Power flow may be aggregated by receiving EVE operational parameters from each EVE, aggregating the received EVE operational parameters, predicting total available capacity based on the aggregated EVE operational parameters, and dispatching at least a portion of the total available capacity to the grid.

A double fed induction generator (DFIG) converter method are presented in which rotor side current spikes are attenuated using series-connected damping resistance in response to grid fault occurrences or grid fault clearances.

A solder bump structure for a ball grid array (BGA) includes at least one under bump metal (UBM) layer and a solder bump formed over the at least one UBM layer. The solder bump has a bump width and a bump height and the ratio of the bump height over the bump width is less than 1.

A system that manages a supplemental energy source connected to a power grid uses a two stage control strategy to manage power transfers in and out of the power grid as well as in and out of an energy storage system, such as a battery bank. One stage uses a non-linear transfer function to control an output frequency of a DC-to-AC inverter to limit undesired effects of power transients that occur on the grid. A second stage uses control strategy for transferring energy between the energy storage system and an internal DC link based on a relationship between a voltage on a DC link connecting the first and second stages and a DC link reference voltage, the voltage on the DC link, and a voltage at the energy storage system. The control strategy includes rapid charging, over-charging protection, and grid transient stabilization.

A flow battery includes a positive electrode, a positive electrode electrolyte, a negative electrode, a negative electrode electrolyte, and a polymer electrolyte membrane interposed between the positive electrode and the negative electrode. The positive electrode electrolyte includes water and a first redox couple. The first redox couple includes a first organic compound which includes a first moiety in conjugation with a second moiety. The first organic compound is reduced during discharge while during charging the reduction product of the first organic compound is oxidized to the first organic compound. The negative electrode electrolyte includes water and a second redox couple. The second couple includes a second organic compound including a first moiety in conjugation with a second moiety. The reduction product of the second organic compound is oxidized to the second organic compound during discharge.

Off the Grid will stage a two-part free-meal giveaway today, April 8, from 12 noon to 1 p.m. at Nob Hill Foods Alameda and from 2:30 p.m. to 3:30 p.m. at Pak 'N Save Emeryville.

It's part of the Grocery Employees Meal Fund, which OTG recently launched to help creators feed grocery-store employees and their family members throughout the Covd-19 crisis.…

A rework grid array interposer with direct power is described. The interposer has a foundation layer mountable between a motherboard and a package. A heater is embedded in the foundation layer to provide local heat to reflow solder to enable at least one of attachment or detachment of the package. A connector is mounted on the foundation layer and coupled to the heater and to the package to provide a connection path directly with the power supply and not via the motherboard. One type of interposer interfaces with a package having a solderable extension. Another interposer has a plurality of heater zones embedded in the foundation layer.

Several local bars and coffee shops in downtown Fayetteville will get a little Artosphere Festival Orchestra pop-up action, thanks to this year's "Off the Grid" this Thursday, June 27. “It’s not that concert hall, tuxedo formal at all,” AFO violist Carl Larson said. “It’s just a great raw, raw way to listen to music and clink a beer.” This annual classical pub crawl, along Dickson and Block, concludes at Smoke and Barrel when AFO conductor Corrado Rovaris joins the musicians to perform, perhaps, an entire movement of a symphony. Click the streaming link above to listen to the full interview with Of Note’s Katy Henriksen.

I live most of the year in a small, fairly self-contained village of about 8 people. We do use grid power where we can't get micro-hydro. There's not enough sun to make solar workable (we're in a valley). We all have wood stoves to heat and cook, big gardens, forage for food and medicine, and hunt and fish for meat as well as raise chickens and sheep. Our main needs from the outside world are salt, grains, cooking fats, sweeteners, tobacco, and tea/coffee. There is a large vegetable farm our friend owns up the road, and most of us work there during the summer and we get lots of free produce. We have neighbors we visit to harvest from their orchards and wild berries.

Being totally self-sufficient all on your own is honestly almost impossible unless you are willing to really, really rough it. The things you need depend on your climate, but outside of a few outlier 'lives in the woods by himself in a cave' folks, this is not easy to achieve.

So you need a house. Insulated from heat and cold. This means building a good shelter with air flow and heating. Wood burning stoves are a good solution. If you're in a 4 season climate, you will need between 2 and 4 cords of wood, (60 hours or so of chopping if you know what you're doing) which have to cure for a year before you can use them, even from dead standing. So chainsaw, axes, wedges, and probably a truck. Which means gas. This means money on an ongoing basis.

You need water. A well or a spring, or a creek close enough to the source to not need filtering. This all means pipes or tubing and maybe a pump unless your sources is higher than your house. Also costs money, and needs to be replaced eventually.

You need food. Most gardens are geared to fruits and veg, and you'll need a lot of space to grow enough to live on without supplementing from stores. Depending on where you are, you might be able to harvest some berries and fruit if you have producing bushes/trees on your land. Or you can plant them and wait until they are mature enough to produce. You will need to freeze, dry or can what you pick or it's gonna go bad before you can eat it all. So you need canning stuff (big pot, grabber tongs, hella mason jars, and those lids have to be replaced every couple years). A root cellar (lots of digging! So much!) will keep your root veggies and apples fresh through the winter if it's deep enough. Wash your cabbages and carrots in bleach water every now and then. You'll add a month to their viability. You'll want a dehydrator for sure. you can build a passive solar one, but we use an electric one as fall fruit in an outdoor space is a bear fun time pantry. You need garden tools. They cost money and need to be replaced periodically.

You still need protein. Say you live in a place where you can fish and hunt (in season). You need to pay for licenses for these things. You can trap smaller game, but that's much more challenging. If you are hunting larger game you will need a deep freezer to store (electricity!) or be content with a massive salting / smoking process that will allow you to store meat long term.

You also need carbs. Grains need a lot of land space, and the right climate. Getting them to an edible state means you'll need to thresh, winnow, and grind your wheat/oats/spelt etc. Grinding means you need a stone mill. A hand crank meat grinder isnt going to cut it (literally) but you'll want one anyway for other stuff. Potatoes are a good source, and are easy to grow in the right climate. These need to be stored in a cool dry place away from rodents and insects to last all year.

You need fats. Wild crafted diets are low in fat, which is not always a good thing. Game meat is low in fat, and you can't make cooking oil from it. Deer tallow will make soap and icky candles. You need bees for good candle wax (and honey!) Raising chickens can get you both fat and eggs. But they need a place to roost that keeps them safe from predators.

You'll need fencing to protect your garden from deer and bears. Without an electric fence, your garden and chickens are going to get eaten or trampled. Dogs help with this, as do shotguns.

So you need micro hydro (only if you have an accessible, appropriate water source that has enough flow rate) or solar (if you live in a place that gets enough sun all year round.

You need medicine. Our mainstays are tinctures and teas. A very small sampling: nettle, mint, mullein, poppy, willow bark, chamomile, chaga, lions mane, spruce tips, elecampane, milky oat, pearly everlasting, ghost pipe, pine pollen, raspberry leaf, and red clover.

If you really want to go all out, you need clothing and cleaning cloth, so you'll need to tan leather or weave flax or cotton. We have alpacas we shear for fiber. They are cute and less trouble than llamas, but won't haul anything, so sometimes we have to borrow a donkey if we're pulling things up a steep path. You'll need soap, so save your tallow.

I could go on. But really, this is a massive, MASSIVE effort for a single person. Without access to money or the outside world it is going to be a slog. But wow, if you're into it, go try it! I don't recommend you buy some remote property and cut yourself off from the world to see if you can hack it. One bad winter where you run through your firewood? One bad frost or dry summer that kills your crops? There's a reason people tend to settle together.

So yeah, you need good land, good water, good equipment, many years to get established, some friendly neighbors, and some way to get money when you need it. Or a bunch of people already doing this that like you and want your help.

Go look up a victorian household guide on Project Gutenberg. So many good ideas! They have instructions for making everything from soap to paint.

Good luck!

It's a rarified way of making music - the ultra-minimal monome grid and norns open music platform. But what is it really about? We turn to reviewer Andreas Roman to find out.

The post monome’s alternative musical world: a hands-on creative expedition with norns and grid appeared first on CDM Create Digital Music.

A lot of recognisable names and musical micro climes run through the blood and wires of this aggressive three. Jimi Hendrix, Sun Ra, Albert Ayler, Don Cherry, pure punk, death metal ... [ read more ]

Developer Andreas Pohl has released AudioGridder, a macOS-only client-server system that lets you offload plugin processing to any other computers in your network. As you probably know, plugins and virtual instruments can be rather hungry for CPU resources. Even if you have a powerful computer, a single DAW session with multiple instances of virtual synthesizers, [...]

View post: Andreas Pohl Releases FREE AudioGridder Plugin For macOS

NEW YORK — Danny Lin cruised his white sports car down Broadway, the bright lights of Times Square gleaming off his sharply detailed Audi R8. He looped through the tourist hot spot again and again, navigating around Corvettes, Mercedes, Mustangs and BMWs — a parade of high-priced vehicles gathered for a rare photo-op. “I never […]

Social media went into meltdown after images emerged of a power pole in the middle of a Newcastle street.

A power company is remotely turning home air conditioners off in a trial to manage peak electricity demand, but will consumers hand over the remote control?

A company that teaches do-it-yourself builders to design and construct their own off-the-grid tiny homes is recognised for helping make cities safer, more resilient and sustainable.

Sylvia Wilson and her now late husband wanted to prove a point when they decided to live off the grid and convert their property to solar power.

IBM's World Community Grid, a worldwide network of PC owners helping scientists solve humanitarian challenges, today announced several computing projects aimed at developing techniques to produce cleaner and safer water, an increasingly scarce commodity eluding at least 1.2 billion people worldwide.

IBM today announced it has been selected by Australian energy provider Western Power as the systems integration and project management partner for its SmartGrid-Advanced Meter Infrastructure pilot program.

IBM (NYSE: IBM) today announced its role as the systems integration partner for the $100 million Smart Grid, Smart City initiative led by the EnergyAustralia consortium. IBM will play a pivotal role, as a member of the consortium, in the development of Australia’s first smart grid network, following the formal contract signing of the deal between EnergyAustralia and the Australian Government.

IBM collaborates with academia and industry to educate and prepare IT professionals, telecommunications engineers, and electrical power engineers for the electricity networks of the future

IBM (NYSE: IBM) today announced the successful implementation of a first of its kind smart grid data management platform, designed and built with Ausgrid to give the utility more data from part of its electricity distribution grid.

DIY home design is a life-long dream of many, and today's architects are making it easier than ever to build your own home without toiling for years. Genoa-based firm TEKE Architects has just unveiled the MU50, a modular off-grid home designed to be configurable to virtually any landscape. Using modules of prefabricated timber frames that can be connected in various layouts, the innovative design is meant to be incorporated into any landscape with minimal impact.[...]

For nearly a century, Airstream has been designing campers built for both adventurous forever roamers or big families looking to enjoy summer time trips together. Now, the iconic camper brand has just introduced its latest concept, which is geared towards sustainable travelers of all types. The 2020 Atlas Camper features a solar-paneled rooftop and an ultra luxurious living space.[...]

C’mon folks. You’re getting to your destinations faster than ever with less than half the traffic on the road so why speed? Yet many of you (not my readers, of course, so pass this onto your friends and acquaintances) are doing so putting all of us at risk.