A Partial Page Cache Strategy for NVRAM-Based Storage Devices

Today, research trends clearly confirm the fact that machine learning technologies open up new opportunities in various computing environments, such as Internet of Things, mobile, and enterprise. Unfortunately, the prior efforts rarely focused on designing system-level input/output stacks (e.g., page cache, file system, block input/output, and storage devices). In this paper, we propose a new page replacement algorithm, called ML-CLOCK, that embeds single-layer perceptron neural network algorithms to enable an intelligent eviction policy. In addition, ML-CLOCK employs preference rules that consider the features of the underlying storage media (e.g., asymmetric read and write costs and efficient write patterns). For evaluation, we implemented a prototype of ML-CLOCK based on trace-driven simulation and compared it with the traditional four replacement algorithms and one flash-friendly algorithm. Our experimental results on the trace-driven environments clearly confirm that ML-CLOCK can improve the hit ratio by up to 72% and reduces the elapsed time by up to 2.16x compared with least frequently used replacement algorithms.

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Electron microscopy of niobium and tantalum hydrides

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100110362 ◽

1978 ◽

Vol 36 (1) ◽

pp. 644-645

Author(s):

T. Schober

Keyword(s):

Electron Microscopy ◽

Heat Storage ◽

Measurement Techniques ◽

Metal Hydrides ◽

Detailed Understanding ◽

Storage Devices ◽

Unit Cells ◽

Endothermic Reactions ◽

Hydrogen Reactions ◽

New Phase

Nb, Ta and V are prototype substances for the study of the endothermic reactions of H with metals. Such metal-hydrogen reactions have gained increased importance due to the application of metal-hydrides in hydrogen- und heat storage devices. Electron microscopy and diffraction were demonstrated to be excellent methods in the study of hydride morphologies and structures (1). - Figures 1 and 2 show the NbH and TaH phase diagrams (2,3,4). EM techniques have contributed substantially to the elucidation of the structures and domain configurations of phases β, ζ and ε (1,4). Precision length measurement techniques of distances in reciprocal space (5) recently led to a detailed understanding of the distortions of the unit cells of phases ζ and ε (4). In the same work (4) the existence of the new phase η was shown. It is stable near -68 °C. The sequence of transitions is thus below 70 %.

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Digital imaging: When should one take the plunge?

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100165471 ◽

1996 ◽

Vol 54 ◽

pp. 602-603

Author(s):

John F. Mansfield

Keyword(s):

Electron Microscopy ◽

Scanning Electron Microscopy ◽

Transmission Electron Microscopy ◽

Optical Microscopy ◽

Digital Imaging ◽

Storage Devices ◽

Major Benefit ◽

Transmission Electron ◽

New Instrument ◽

Scanning Electron

The current imaging trend in optical microscopy, scanning electron microscopy (SEM) or transmission electron microscopy (TEM) is to record all data digitally. Most manufacturers currently market digital acquisition systems with their microscope packages. The advantages of digital acquisition include: almost instant viewing of the data as a high-quaity positive image (a major benefit when compared to TEM images recorded onto film, where one must wait until after the microscope session to develop the images); the ability to readily quantify features in the images and measure intensities; and extremely compact storage (removable 5.25” storage devices which now can hold up to several gigabytes of data).The problem for many researchers, however, is that they have perfectly serviceable microscopes that they routinely use that have no digital imaging capabilities with little hope of purchasing a new instrument.

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An aqueous hybrid electrolyte for low-temperature zinc-based energy storage devices

Energy & Environmental Science ◽

10.1039/d0ee01538e ◽

2020 ◽

Vol 13 (10) ◽

pp. 3527-3535 ◽

Cited By ~ 1

Author(s):

Nana Chang ◽

Tianyu Li ◽

Rui Li ◽

Shengnan Wang ◽

Yanbin Yin ◽

...

Keyword(s):

Energy Storage ◽

Low Temperature ◽

Energy Storage Devices ◽

Storage Devices

A frigostable aqueous hybrid electrolyte enabled by the solvation interaction of Zn2+–EG is proposed for low-temperature zinc-based energy storage devices.

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A Summary Review on the Applications of Nanotechnology in the Manufacturing of Renewable Energy Production and Storage Devices

International Conference on Artificial Intelligence, Energy and Manufacturing Engineering (ICAEME'2015) Jan. 7-8, 2015 Dubai (UAE) ◽

10.15242/iie.e0115033 ◽

2015 ◽

Keyword(s):

Renewable Energy ◽

Energy Production ◽

Storage Devices ◽

Renewable Energy Production ◽

And Storage

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NMR studies of alkali intercalted carbon nanotubes

MRS Proceedings ◽

10.1557/proc-772-m3.4 ◽

2003 ◽

Vol 772 ◽

Cited By ~ 1

Author(s):

M. Schmid ◽

C. Goze-Bac ◽

M. Mehring ◽

S. Roth ◽

P. Bernier

Keyword(s):

Carbon Nanotubes ◽

Lattice Relaxation ◽

Spin Lattice Relaxation ◽

Energy Storage Devices ◽

Nmr Studies ◽

Storage Devices ◽

Spin Lattice ◽

Relaxation Measurements ◽

Resonance Spin ◽

Walled Carbon Nanotubes

AbstractLithium intercalted carbon nanotubes have attracted considerable interest as perspective components for energy storage devices. We performed 13C Nuclear Magnetic Resonance spin lattice relaxation measurements in a temperature range from 4 K up to 300 on alkali intercalated Single Walled Carbon Nanotubes in order to investigate the modifications of the electronic properties. The density of states at the Fermi level were determined for pristine, lithium and cesium intercalated carbon nanotubes and are discussed in terms of intercalation and charge transfer effects.

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DEVELOPMENT OF THE METHOD OF DYNAMIC DISTRIBUTION OF USERS’ DATA IN STORAGE DEVICES IN DATA PROCESSING CENTERS

Problems of Information Technology ◽

10.25045/jpit.v07.i2.01 ◽

2016 ◽

Vol 07 (2) ◽

pp. 3-7

Author(s):

Rashid Alakbarov ◽

◽

Fahrad Pashayev ◽

Mammad Hashimov ◽

◽

...

Keyword(s):

Data Processing ◽

Dynamic Distribution ◽

Storage Devices

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How Certain Are the Reported Ionic Conductivities of Thiophosphate-Based Solid Electrolytes? an Interlaboratory Study

10.26434/chemrxiv.11316497.v2 ◽

2020 ◽

Author(s):

Saneyuki Ohno ◽

Tim Bernges ◽

Johannes Buchheim ◽

Marc Duchardt ◽

Anna-Katharina Hatz ◽

...

Keyword(s):

Standard Deviation ◽

Ionic Conductivity ◽

Relative Standard Deviation ◽

Solid Electrolytes ◽

Ionic Conductivities ◽

Ionic Conductors ◽

Energy Storage Devices ◽

Activation Barriers ◽

Storage Devices ◽

Relative Standard

Owing to highly conductive solid ionic conductors, all-solid-state batteries attract significant attention as promising next-generation energy storage devices. A lot of research is invested in the search and optimization of solid electrolytes with higher ionic conductivity. However, a systematic study of an interlaboratory reproducibility of measured ionic conductivities and activation energies is missing, making the comparison of absolute values in literature challenging. In this study, we perform an uncertainty evaluation via a Round Robin approach using different Li-argyrodites exhibiting orders of magnitude different ionic conductivities as reference materials. Identical samples are distributed to different research laboratories and the conductivities and activation barriers are measured by impedance spectroscopy. The results show large ranges of up to 4.5 mScm-1 in the measured total ionic conductivity (1.3 – 5.8 mScm-1 for the highest conducting sample, relative standard deviation 35 – 50% across all samples) and up to 128 meV for the activation barriers (198 – 326 meV, relative standard deviation 5 – 15%, across all samples), presenting the necessity of a more rigorous methodology including further collaborations within the community and multiplicate measurements.

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Ultrathin Carbon Nanosheets for Highly-efficient Capacitive K-ion and Zn-ion Storage

10.26434/chemrxiv.12413411.v2 ◽

2020 ◽

Author(s):

Yamin Zhang ◽

Zhongpu Wang ◽

Deping Li ◽

Qing Sun ◽

Kangrong Lai ◽

...

Keyword(s):

Energy Storage ◽

Porous Carbon ◽

Metal Ion ◽

Rate Capability ◽

Energy Storage Devices ◽

Capacity Retention ◽

Carbon Nanosheets ◽

Storage Devices ◽

High Efficient ◽

Ion Storage

Porous carbon has attracted extensive attentions as the electrode material for various energy storage devices considering its advantages like high theoretical capacitance/capacity, high conductivity, low cost and earth abundant inherence. However, there still exists some disadvantages limiting its further applications, such as the tedious fabrication process, limited metal-ion transport kinetics and undesired structure deformation at harsh electrochemical conditions. Herein, we report a facile strategy, with calcium gluconate firstly reported as the carbon source, to fabricate ultrathin porous carbon nanosheets. <a>The as-prepared Ca-900 electrode delivers excellent K-ion storage performance including high reversible capacity (430.7 mAh g-1), superior rate capability (154.8 mAh g-1 at an ultrahigh current density of 5.0 A g-1) and ultra-stable long-term cycling stability (a high capacity retention ratio of ~81.2% after 4000 cycles at 1.0 A g-1). </a>Similarly, when being applied in Zn-ion capacitors, the Ca-900 electrode also exhibits an ultra-stable cycling performance with ~90.9% capacity retention after 4000 cycles at 1.0 A g-1, illuminating the applicable potentials. Moreover, the origin of the fast and smooth metal-ion storage is also revealed by carefully designed consecutive CV measurements. Overall, considering the facile preparation strategy, unique structure, application flexibility and in-depth mechanism investigations, this work will deepen the fundamental understandings and boost the commercialization of high-efficient energy storage devices like potassium-ion/sodium-ion batteries, zinc-ion batteries/capacitors and aluminum-ion batteries.

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Further Evidence for Energy Landscape Flattening in the Superionic Argyrodites Li6+xP1−xMxS5I (M = Si, Ge, Sn)

10.26434/chemrxiv.8109506.v2 ◽

2019 ◽

Author(s):

Saneyuki Ohno ◽

Bianca Helm ◽

Till Fuchs ◽

Georg Dewald ◽

Marvin Kraft ◽

...

Keyword(s):

Solid State ◽

Activation Barrier ◽

Energy Landscape ◽

General Mechanism ◽

Ionic Conductors ◽

Energy Storage Devices ◽

Ion Conductor ◽

Storage Devices ◽

Open Questions ◽

Sudden Decrease

All-solid-state batteries are promising candidates for next-generation energy storage devices. Although the list of candidate materials for solid electrolytes has grown in the past decade, there are still many open questions concerning the mechanisms behind ionic migration in materials. In particular, the lithium thiophosphate family of materials has shown very promising properties for solid-state battery applications. Recently, the Ge-substituted Li6PS5I argyrodite was shown to be a very fast Li-ion conductor, despite the poor ionic conductivity of the unsubstituted Li6PS5I. Therein, the conductivity was enhanced by over three orders of magnitude due to the emergence of I−/S2−exchange, i.e.site-disorder, which led to a sudden decrease of the activation barrier with a concurrent flattening of the energy landscapes. Inspired by this work, two series of elemental substitutions in Li6+xP1−xMxS5I (M= Si and Sn) were investigated in this study and compared to the Ge-analogue. A sharp reduction in the activation energy was observed at the same M4+/P5+composition as previously found in the Ge-analogue, suggesting a more general mechanism at play. Furthermore, structural analyses with X-ray and neutron diffraction indicate that similar changes in the Li-sublattice occur despite a significant variation in the size of the substituents, suggesting that in the argyrodites, the lithium substructure is most likely influenced by the occurring Li+– Li+interactions. This work provides further evidence that the energy landscape of ionic conductors can be tailored by inducing local disorder.

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