554 research outputs found
Non-local transport and the hydrodynamic shear viscosity in graphene
Motivated by recent experimental progress in preparing encapsulated graphene
sheets with ultra-high mobilities up to room temperature, we present a
theoretical study of dc transport in doped graphene in the hydrodynamic regime.
By using the continuity and Navier-Stokes equations, we demonstrate
analytically that measurements of non-local resistances in multi-terminal Hall
bar devices can be used to extract the hydrodynamic shear viscosity of the
two-dimensional (2D) electron liquid in graphene. We also discuss how to probe
the viscosity-dominated hydrodynamic transport regime by scanning probe
potentiometry and magnetometry. Our approach enables measurements of the
viscosity of any 2D electron liquid in the hydrodynamic transport regime.Comment: 12 pages, 4 multi-panel figure
The intriguing question of regional and territorial development in rural areas: analytical variations and Public Policy
The aim of this paper is to shed light on territorial development and rural development issues, and to review the links and differences between. Indeed, everything points to reach those dimensions that have long seemed disconnected. On the one hand, rural policies incorporate explicitly the territorial dimension, even though the rural-urban distinction is increasingly blurred. At the same time, decentralization, subsidiarity, the regionalization of agricultural production, but also short circuits or local foods deal with the generalization of an urban model. Finally, regional science pays attention to agricultural and rural dimensions, even though research on rural areas is opening to territorial issues. The first part of the paper is devoted to a presentation and a critical attempt to define the concepts of development, territory and rural. The second part addresses the issues of regional and territorial development with a presentation of the major theories and key public policies, and concludes with a reflection on the ways for reconciliation between theory and policy. The third part follows the same pattern applied to the issue of rural development, from theoretical analyses to concrete policies
Electron hydrodynamics dilemma: whirlpools or no whirlpools
In highly viscous electron systems such as, for example, high quality
graphene above liquid nitrogen temperature, a linear response to applied
electric current becomes essentially nonlocal, which can give rise to a number
of new and counterintuitive phenomena including negative nonlocal resistance
and current whirlpools. It has also been shown that, although both effects
originate from high electron viscosity, a negative voltage drop does not
principally require current backflow. In this work, we study the role of
geometry on viscous flow and show that confinement effects and relative
positions of injector and collector contacts play a pivotal role in the
occurrence of whirlpools. Certain geometries may exhibit backflow at
arbitrarily small values of the electron viscosity, whereas others require a
specific threshold value for whirlpools to emerge
Land Use Conflicts in the Developing Countries: Proximate Driving Forces and Preventive Measures
This research aims to analyse land use conflicts mainly caused
by infrastructural development projects in the developing countries. For
this purpose, qualitative data is gathered which is frequently published
on land use conflicts against the development related infrastructure
projects in Brazil, China, India, Indonesia and Pakistan. It identifies
and defines land use conflicts, their dynamic features and
contestations. The results reveal as to how the conflicts have been
germinated by the property and human right violators? Further, it also
focuses on the governance roles and responsibilities, the institutional
inconsistency towards justice, and the local population’s mistrust in
the respective case study areas. The analysis concludes with an overview
of the root causes and consequences of land use conflicts, by indicating
as to how land use decisions for infrastructural settings have changed
rural economy, and induced local population to displace and oppose the
projects. Finally, the study proposes some preventive measures to manage
such conflicts. JEL Classification: D74, O16, H54 Keywords: Conflict,
Proximity Relations, Infrastructure, Developing Countrie
Mezcla asfáltica en caliente modificada con plástico reciclado para la determinación de sus propiedades mecánicas
Las mezclas asfálticas modificadas han demostrado mejores resultados en cuanto a
durabilidad en comparación con mezclas asfálticas convencionales, dando la oportunidad
de adecuarlas a unas condiciones específicas de respuesta según las necesidades del
proyecto.
La presente investigación realizada lleva como título “Mezcla asfáltica en caliente
modificada con plástico reciclado para la determinación de sus propiedades mecánicas”,
dándose a conocer diversas investigaciones acerca del uso del plástico reciclado pet en
una mezcla asfáltica modificada. se analizaron 20 trabajos de investigación, de las cuales
10 nacionales y 10 internacionales, tuvo como objetivo principal determinar las
propiedades de la mezcla asfáltica en caliente modificado con plásticos reciclados pet,
para la determinación de sus propiedades mecánicas. Siendo esta investigación
documental bibliográfica en donde los estudios revisados utilizaron el método deductivo,
enfoqué cuantitativo y orientación aplicada, nivel descriptivo. Conforme se desarrolló la
investigación se observó que utilizaron distintos tipos, porcentajes y tamaños de partícula
del platico que son añadidos a la mezcla para realizar una comparación entre ambas
mezclas y analizar la cantidad de mejoría al adicionar el plástico como aditivo a la carpeta
asfáltica en sus propiedades mecánicas como la estabilidad, la relación de vacíos y el
flujo, resaltando que la estabilidad es la propiedad mecánica más beneficiada al
adicionarse el plástico al asfalto
Proyecto de diseño e implementación de torre de control para los procesos de gestión de inventarios de harinas industriales en Alicorp S. A. A.
Alicorp S.A.A. es una compañía peruana, fundada en 1956 y listada en la bolsa desde 1980; dedicada principalmente a la fabricación, exportación, importación, distribución y comercialización de productos de consumo masivo, así como a la industria y comercialización del trigo y/o cereales, en sus distintas formas como harina, galletas, fideos y sus derivados (Alicorp, s.f.). Actualmente, uno de los negocios con mayor relevancia es la elaboración y comercialización de productos industriales: entre grasas y harinas. Dentro de la categoría de harinas se cuenta con un variado portafolio: pasteleras, panaderas, fideeras, panetoneras y galleteras, que permiten abastecer a importantes empresas, nacionales e internacionales, dedicadas a la
panificación. La producción de estas harinas es realizada en las plantas de Molino Callao, Molino Paita, Molino Arequipa y Masterbread. La planta del Callao es considerada uno de los molinos más grandes de Sudamérica (Alicorp, 2022)
Oral azacitidine prolongs survival of patients with AML in remission independently of measurable residual disease status
Measurable residual disease (MRD) in patients with acute myeloid leukemia (AML) in remission after intensive chemotherapy is predictive of early relapse and poor survival. Postremission maintenance therapy that prolongs MRD negativity or converts MRD+ patients to MRD- status may delay or prevent relapse and improve overall survival (OS). In the phase 3 QUAZAR AML-001 trial, oral azacitidine (oral-AZA; formerly CC-486), a hypomethylating agent, significantly prolonged OS and relapse-free survival (RFS) compared with placebo in patients aged >= 55 years with AML in first remission after intensive chemotherapy who were not candidates for hematopoietic stem cell transplantation. In this trial, MRD (>= 0.1% leukemic cells in bone marrow) was assessed by multiparameter flow cytometry in serial samples collected at baseline and on day 1 of every 3 cycles. As expected, baseline MRD status was significantly associated with both OS and RFS. Multivariate analyses showed oral-AZA significantly improved OS and RFS vs placebo independent of baseline MRD status. Oral-AZA treatment also extended the duration of MRD negativity by 6 months vs placebo and resulted in a higher rate of conversion from MRD+ at baseline to MRD- during treatment: 37% vs 19%, respectively. In the oral-AZA arm, 24% of MRD responders achieved MRD negativity >6 months after treatment initiation. Although presence or absence of MRD was a strong prognostic indicator of OS and RFS, there were added survival benefits with oral-AZA maintenance therapy compared with placebo, independent of patients' MRD status at baseline.Peer reviewe
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