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Standing with Standing Rock : voices from the #NoDAPL movement
\"Amid the Standing Rock movement to protect the land and the water that millions depend on for life, the Oceti Sakowin (the Dakota, Nakota, and Lakota people) reunited. Through poetry and prose, essays, photography, interviews, and polemical interventions, the contributors reflect on Indigenous history and politics and on the movement's significance. Their work challenges our understanding of colonial history not simply as \"lessons learned\" but as essential guideposts for activism\"-- Provided by publisher.
Book
Defect‐Rich Heterogeneous MoS2/NiS2 Nanosheets Electrocatalysts for Efficient Overall Water Splitting
Designing and constructing bifunctional electrocatalysts is vital for water splitting. Particularly, the rational interface engineering can effectively modify the active sites and promote the electronic transfer, leading to the improved splitting efficiency. Herein, free‐standing and defect‐rich heterogeneous MoS2/NiS2 nanosheets for overall water splitting are designed. The abundant heterogeneous interfaces in MoS2/NiS2 can not only provide rich electroactive sites but also facilitate the electron transfer, which further cooperate synergistically toward electrocatalytic reactions. Consequently, the optimal MoS2/NiS2 nanosheets show the enhanced electrocatalytic performances as bifunctional electrocatalysts for overall water splitting. This study may open up a new route for rationally constructing heterogeneous interfaces to maximize their electrochemical performances, which may help to accelerate the development of nonprecious electrocatalysts for overall water splitting. A synthetic strategy is provided to rationally construct defect‐rich heterogeneous MoS2/NiS2 nanosheets directly on carbon cloth and the influence of interface configuration on the electrocatalytic performances is investigated. The abundant heterogeneous interfaces in MoS2/NiS2 can not only provide rich electroactive sites but also facilitate the electron transfer, which further cooperate synergistically toward electrocatalytic reactions.
Journal Article
A guide to active working in the modern office : homo sedens in the 21st century
\"This is a short guide on sit-stand working in the office. It reviews the research on sitting and standing at work from the 1950s to present, and provides guidance for specialists, therapists, practitioners, and managers. The book is illustrated with many photos and figures and is understandable to the layman as well as the specialist. With the increased emphasis on healthy lifestyles, coupled with the obesity and overweight epidemic, many are claiming that we should spend more time standing at work. Some have even claimed that sitting is the new smoking. Readers of the book will learn and understand what is behind these claims, what stacks-up, what doesn't, and be able to make informed decisions about whether to invent in new facilities, and what to invest. This book is of value to human factors specialists, physical therapists, chiropractors and occupational health practitioners, architects, and facilities managers\"-- Provided by publisher.
Book
Standing Wave Photon Structures in Constraint Spaces
Based on the single-photon structure model, the standing wave electric 4-photon (SWE4-P) composite, the standing wave magnetic 4-photon (SWM4-P) composite in one-dimensional longitudinal constraint space, and the standing wave 8-photon (SW8-P) composite structure in a laser microcavity are derived. The electromagnetic field of the TM010 mode in a microwave cylindrical resonant cavity is studied and analyzed, and the photon structure basic unit of this mode is identified as the standing wave cylindrical 8-photon composite structure. The cylindrical photon is of the same size as the cavity volume, the photon volume being V = πR2L. The standing wave 8-photon composite structure contains an SWE4-P composite and an SWM4-P composite, with a phase difference of 90°. Therefor, the energy unit of the TM010 mode in the cavity is 8ℏω.
Journal Article
Standing Rock : greed, oil and the Lakota's struggle for justice
Ekberzade recounts the tale--through conversations with the key players--of the protest movement within the Standing Rock Sioux Reservation against the re-routing of the Dakota Access Pipeline through reservation lands. She also explores how the movement fits into an epic, centuries-old story of struggle, dispossession and the persecution of America's indigenous peoples, as told to her directly by the guardians of the oral history of the Great Plains. --Adapted from publisher description.
Book
Rolling microswarms along acoustic virtual walls
Rolling is a ubiquitous transport mode utilized by living organisms and engineered systems. However, rolling at the microscale has been constrained by the requirement of a physical boundary to break the spatial homogeneity of surrounding mediums, which limits its prospects for navigation to locations with no boundaries. Here, in the absence of real boundaries, we show that microswarms can execute rolling along virtual walls in liquids, impelled by a combination of magnetic and acoustic fields. A rotational magnetic field causes individual particles to self-assemble and rotate, while the pressure nodes of an acoustic standing wave field serve as virtual walls. The acoustic radiation force pushes the microswarms towards a virtual wall and provides the reaction force needed to break their fore-aft motion symmetry and induce rolling along arbitrary trajectories. The concept of reconfigurable virtual walls overcomes the fundamental limitation of a physical boundary being required for universal rolling movements.
The application of rolling motion to microswarm navigation and cargo delivery has been constrained by the need for a physical boundary to roll along to date. Here, Zhang et al. solve this problem by introducing a reconfigurable virtual wall implemented by a combination of magnetic and acoustic fields.
Journal Article
Nitrogen, Oxygen‐Codoped Vertical Graphene Arrays Coated 3D Flexible Carbon Nanofibers with High Silicon Content as an Ultrastable Anode for Superior Lithium Storage
Free‐standing and foldable electrodes with high energy density and long lifespan have recently elicited attention on the development of lithium‐ion batteries (LIBs) for flexible electronic devices. However, both low energy density and slow kinetics in cycling impede their practical applications. In this work, a free‐standing and binder‐free N, O‐codoped 3D vertical graphene carbon nanofibers electrode with ultra‐high silicon content (VGAs@Si@CNFs) is developed via electrospinning, subsequent thermal treatment, and chemical vapor deposition processes. The as‐prepared VGAs@Si@CNFs electrode exhibits excellent conductivity and flexibility because of the high graphitized carbon nanofiber network and abundant vertical graphene arrays. Such 3D all‐carbon architecture can be fabulous for providing a conductive and mechanically robust network, further improving the kinetics and restraining the volume expansion of Si NPs, especially with an ultra‐high Si content (>90 wt%). As a result, the VGAs@Si@CNFs composite demonstrates a superior specific capacity (3619.5 mAh g−1 at 0.05 A g−1), ultralong lifespan, and outstanding rate capability (1093.1 mAh g−1 after 1500 cycles at 8 A g−1) as a free‐standing anode for LIBs. It is believed that this work offers an exciting method for developing free‐standing and high‐energy‐density electrodes for other energy storage devices. A free‐standing ultra‐high silicon content flexible anode with enhanced hydrophilicity is successfully developed by growing vertical graphene arrays on Si@CNFs (VGAs@Si@CNFs), which is regarded as “building blocks” and “bridges” to improve the conductivity the electrode, prevent the aggregation and pulverization of Si. This work casts new light on the high‐energy anode design for possessing rate capability and cycling stability.
Journal Article
Multiple normalized solutions for a Sobolev critical Schrödinger equation
We study the existence of standing waves, of prescribed
L
2
-norm (the
mass
), for the nonlinear Schrödinger equation with mixed power nonlinearities
i
∂
t
ϕ
+
Δ
ϕ
+
μ
ϕ
|
ϕ
|
q
-
2
+
ϕ
|
ϕ
|
2
∗
-
2
=
0
,
(
t
,
x
)
∈
R
×
R
N
,
where
N
≥
3
,
ϕ
:
R
×
R
N
→
C
,
μ
>
0
,
2
<
q
<
2
+
4
/
N
and
2
∗
=
2
N
/
(
N
-
2
)
is the critical Sobolev exponent. It was proved in Jeanjean et al. (Orbital stability of ground states for a Sobolev critical Schrödinger equation, 2020) that, for small
mass
, ground states exist and correspond to local minima of the associated Energy functional. It was also established that despite the nonlinearity is Sobolev critical, the set of ground states is orbitally stable. Here we prove that, when
N
≥
4
, there also exist standing waves which are not ground states and are located at a mountain-pass level of the Energy functional. These solutions are unstable by blow-up in finite time. Our study is motivated by a question raised by Soave (J Funct Anal 279(6):108610, 2020).
Journal Article
The application of acoustics for sample manipulation and delivery at X-Ray Light Sources
The latest developments in acoustic technology and their integration of standing waves offers the potential to eject and trap tiny amounts of both liquid and solids with precision and stability in free space. This is appealing for experimenters at Light Sources who are traditionally relying on the use of containers or on the manual attachment of the samples to solid supports for analysis with X rays or IR. Here we present a brief overview of applications of acoustics and levitation for sample manipulation and delivery currently under investigation at Diamond Light source.
Journal Article
Domain Boundary Formation Within an Intercalated Pb Monolayer Featuring Charge‐Neutral Epitaxial Graphene
The synthesis of new graphene‐based quantum materials by intercalation is an auspicious approach. However, an accompanying proximity coupling depends crucially on the structural details of the new heterostructure. It is studied in detail the Pb monolayer structure after intercalation into the graphene buffer layer on the SiC(0001) interface by means of photoelectron spectroscopy, x‐ray standing waves, and scanning tunneling microscopy. A coherent fraction close to unity proves the formation of a flat Pb monolayer on the SiC surface. An interlayer distance of 3.67 Å to the suspended graphene underlines the formation of a truly van der Waals heterostructure. The 2D Pb layer reveals a quasi ten‐fold periodicity due to the formation of a grain boundary network, ensuring the saturation of the Si surface bonds. Moreover, the densely‐packed Pb layer also efficiently minimizes the doping influence by the SiC substrate, both from the surface dangling bonds and the SiC surface polarization, giving rise to charge‐neutral monolayer graphene. The observation of a long‐ranged () reconstruction on the graphene lattice at tunneling conditions close to Fermi energy is most likely a result of a nesting condition to be perfectly fulfilled.
Journal Article