Jonathan Mace
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View article: Intent-based System Design and Operation
Intent-based System Design and Operation Open
Cloud systems are the backbone of today's computing industry. Yet, these systems remain complicated to design, build, operate, and improve. All these tasks require significant manual effort by both developers and operators of these systems…
View article: Electromagnetic effects on explosive reaction and plasma
Electromagnetic effects on explosive reaction and plasma Open
A number of studies have reported that electric fields can have quantifiable effects on the initiation and growth of detonation, yet the mechanisms of these effects are not clear. Candidates include Joule heating of the reaction zone, pert…
View article: Modeling the shock initiation of PBX 9501 in ALE3D
Modeling the shock initiation of PBX 9501 in ALE3D Open
The SMIS (Specific Munitions Impact Scenario) experimental series performed at Los Alamos National Laboratory has determined the 3-dimensional shock initiation behavior of the HMX based heterogeneous high explosive, PBX9501, which has a PM…
View article: Multi-phasic explosive fracturing system
Multi-phasic explosive fracturing system Open
Disclosed herein are embodiments of precursor components (or compositions thereof) that can be combined with one or more additional components (or compositions thereof) to form an explosive composition. The disclosed precursor components (…
View article: Level frequency postulate and the dice analog
Level frequency postulate and the dice analog Open
A level frequency postulate is proposed in the context of the Onsager regression hypothesis, and is utilized to demonstrate Fourier fluctuation time between levels in an analog system composed of red and white dice. This dice system is sho…
View article: Casings for use in a system for fracturing rock within a bore
Casings for use in a system for fracturing rock within a bore Open
In disclosed explosive units for use in a wellbore, the casing can include a tubular outer body comprising grooves, pockets, or other variances in thickness that create stress concentrations that promote shear and tensile fragmentation ins…
View article: Explosive assembly and method
Explosive assembly and method Open
An explosive assembly includes a first explosive unit having a first longitudinal end portion having a first mechanical coupling feature, a second explosive unit having a second longitudinal end portion having a second mechanical coupling …
View article: Fluid transport systems for use in a downhole explosive fracturing system
Fluid transport systems for use in a downhole explosive fracturing system Open
Explosive devices and assemblies are described herein for use in geologic fracturing. Components of energetic material used in the explosive devices can be initially separated prior to inserting the assembled system down a wellbore, then l…
View article: Geologic fracturing method and resulting fractured geologic structure
Geologic fracturing method and resulting fractured geologic structure Open
Detonation control modules and detonation control circuits are provided herein. A trigger input signal can cause a detonation control module to trigger a detonator. A detonation control module can include a timing circuit, a light-producin…
View article: Magnetic infrasound sensor
Magnetic infrasound sensor Open
A magnetic infrasound sensor is produced by constraining a permanent magnet inside a magnetic potential well above the surface of superconducting material. The magnetic infrasound sensor measures the position or movement of the permanent m…
View article: System for fracturing an underground geologic formation
System for fracturing an underground geologic formation Open
An explosive system for fracturing an underground geologic formation adjacent to a wellbore can comprise a plurality of explosive units comprising an explosive material contained within the casing, and detonation control modules electrical…
View article: Detonation command and control
Detonation command and control Open
The detonation of one or more explosive charges and propellant charges by a detonator in response to a fire control signal from a command and control system comprised of a command center and instrumentation center with a communications lin…
View article: Multi-stage geologic fracturing
Multi-stage geologic fracturing Open
Explosive geologic fracturing methods, devices, and systems can be used in combination with other geologic fracturing means, such as hydraulic fracturing methods, devices and systems, or other fluid-based fracturing means. An exemplary met…
View article: Groundhog: Efficient Request Isolation in FaaS
Groundhog: Efficient Request Isolation in FaaS Open
Security is a core responsibility for Function-as-a-Service (FaaS) providers. The prevailing approach has each function execute in its own container to isolate concurrent executions of different functions. However, successive invocations o…
View article: ACT now: Aggregate Comparison of Traces for Incident Localization
ACT now: Aggregate Comparison of Traces for Incident Localization Open
Incidents in production systems are common and downtime is expensive. Applying an appropriate mitigating action quickly, such as changing a specific firewall rule, reverting a change, or diverting traffic to a different availability zone, …
View article: Physics Guided Simulation of Electrostatic Discharge: Technical Report
Physics Guided Simulation of Electrostatic Discharge: Technical Report Open
Triboelectrically-charged objects may create threshold sparks, electrostatic discharge (ESD) events, to equilibrate charge between themselves and other relatively charged objects. ESD events exhibit many complex physical phenomena. They ar…
View article: The Benefit of Hindsight: Tracing Edge-Cases in Distributed Systems
The Benefit of Hindsight: Tracing Edge-Cases in Distributed Systems Open
Today's distributed tracing frameworks are ill-equipped to troubleshoot rare edge-case requests. The crux of the problem is a trade-off between specificity and overhead. On the one hand, frameworks can indiscriminately select requests to t…
View article: A Cursory Introduction to Detonation Physics: Brief snippets & examples [Slides]
A Cursory Introduction to Detonation Physics: Brief snippets & examples [Slides] Open
for expensive journal subscriptions. As libraries begin to cancel journal subscriptions, the peer review process will lose its primary source of funding. Open Access publishing models can potentially address this issue. European physicists…
View article: On Hydrodynamics Generated from Electrostatic Discharges: A Heat Source Perspective
On Hydrodynamics Generated from Electrostatic Discharges: A Heat Source Perspective Open
A parameter space map of a heat source depositing energy into a cylindrical spark channel modeling the hydrodynamic effects of an electrostatic discharge event is explored. The four parameters of spatial weight, λR, rise time, τr, fall tim…
View article: Analysis into Asymptotic Convergence to Full Nonlinear Solutions and Exploration of the Implication of Numerical Operator Mutation of Differential Systems
Analysis into Asymptotic Convergence to Full Nonlinear Solutions and Exploration of the Implication of Numerical Operator Mutation of Differential Systems Open
A robust, sufficiently accurate and practical hydrodynamic simulation toolset is required as a key component of the modeling and simulation of air-gap electrostatic discharge events. This work was performed to complement these ongoing effo…
View article: On Hydrodynamics Generated from Electrostatic Discharges: A Heat Source Perspective
On Hydrodynamics Generated from Electrostatic Discharges: A Heat Source Perspective Open
Detail of the motion is also given for the parameters of interest for each case studied. Selected values of initial pitch rate, roll rate, and combinations of these within the range 0[degree] to 1000[degrees]/sec were investigated for init…
View article: LANL studies of ESD spark energy discharge through September 2019
LANL studies of ESD spark energy discharge through September 2019 Open
Two concentric-sphere apparatuses were used to measure the energies deposited by electric sparks through air to calibrated loads. Both sets of spheres had clean, uninsulated metal surfaces. The 127-mm diameter pair of spheres had a gap of …
View article: Nonlinear Spark Resistance and Capacitive Circuit Models of Electrostatic Discharge
Nonlinear Spark Resistance and Capacitive Circuit Models of Electrostatic Discharge Open
Over the past century, several models of spark discharge have been developed that approximate the effect of a spark channel in a circuit as a nonlinear resistance. In this article, we review the physical derivations of a set of spark model…