Adapting V-ISA Technology: Driver Behaviour along Interchange Ramp and Merging/Diverging Terminals

An original in-vehicle Intelligent Speed Adaptation System for Visibility (V-ISA) was designed to promote compliance with real-time speed management. The functionality of V-ISA is based on the prevailing sight conditions along the road, and operates in two variants: (i) providing visual information, and (ii) vehicle speed intervention. A road scenario with the driver performing merging and diverging manoeuvres in a motorway section was designed. A within-subject experiment involved 32 participants and a vehicle equipped with the two variants and the system off (baseline condition) under two traffic flow conditions. V-ISA had a significant positive effect on the drivers' longitudinal performance along ramps. This change in behaviour along ramps had no effect on merging and diverging manoeuvres. V-ISA had a positive impact on driver speed behaviour in such complex road environment and assisted drivers to modulate the operating speed towards the safe dynamic limits

Simulating chemistry using quantum computers

The difficulty of simulating quantum systems, well-known to quantum chemists, prompted the idea of quantum computation. One can avoid the steep scaling associated with the exact simulation of increasingly large quantum systems on conventional computers, by mapping the quantum system to another, more controllable one. In this review, we discuss to what extent the ideas in quantum computation, now a well-established field, have been applied to chemical problems. We describe algorithms that achieve significant advantages for the electronic-structure problem, the simulation of chemical dynamics, protein folding, and other tasks. Although theory is still ahead of experiment, we outline recent advances that have led to the first chemical calculations on small quantum information processors.Comment: 27 pages. Submitted to Ann. Rev. Phys. Che

Fertilización del maíz (Zea mays L.) H-302 con fósforo y zinc en un suelo del Oriente de Cundinamarca.

Se observaron las aplicaciones de P y Zn en maíz H-302 al Oriente de Cundinamarca, Ubaque. Se adelantaron ensayos de invernadero y campo utilizando diseño central con 5 dosis de cada uno de estos dos elementos. La producción de materia seca de maíz cosechado a las 6 semanas de sembradas en el campo, mostró que la aplicación de P para que esta sea máxima, varía entre 85 y 100 kg/ha aumentando esta dosis a médida que se incrementan las cantidades de ZnSO4 aplicadas. La interacción P x Zn presentó un efecto negativo sobre la producción de grano de maíz, mientras que los efectos independientes tanto de P como de ZnSO4 fueron positivos. Con las dosis utilizadas no se alcanzó a obtener un rendimiento máximo, pero es probable que en suelos de esta naturaleza, altos en P aprovechable, no sea económico aplicar este elemento. Quizá sea más práctico aplicar únicamente ZnSo4. Se encontraron efectos antagónicos entre el P y el Zn en cuanto al contenido de ellos en las plantas, pero no se presentó dicho efecto en cuanto al contenido de P y de Zn en el suelo. Esto confirma la afirmación de muchos autores quienes opinan que el efecto antagónico entre el P y el Zn es más de tipo fisiológico dentro de la planta que de tipo químico en el sueloMaíz-Zea maysMaestría en CienciasMaestrí

A new combined quasigeoid model in Tierra del Fuego

This work focuses on the development of a combined quasigeoid model for Tierra del Fuego province. The Equivalent Source Technique (EST) is applied together with the remove-compute-restore technique in order to combine gravity and GPS/levelling observations and to obtain a quasigeoid model. This model features an improved accuracy in relation to previous models. A discussion about the geodetic reference system is also presented. Geodetic coordinates of all stations used were transformed to TDF08 to be in accordance with the new geodetic reference frame of Argentina. After a cross validation procedure it is determined that a 5cm (r.m.s.) quasigeoid model has been achieved for the major part of the province, fulfilling the requirements for its practical use. New Global Geopotential Models (GGM) are introduced in the discussion, particularly the EGM2008 which is used for evaluation purposes. It shows a 9cm agreement after its evaluation on the levelling lines

Two-loop renormalisation of gauge theories in 4D4D Implicit Regularisation: transition rules to dimensional methods

We compute the two-loop $\beta$-function of scalar and spinorial quantum electrodynamics as well as pure Yang-Mills and quantum chromodynamics using the background field method in a fully quadridimensional setup using Implicit Regularization (IREG). Moreover, a thorough comparison with dimensional approaches such as conventional dimensional regularization (CDR) and dimensional reduction (DRED) is presented. Particularly, for our calculations we show that the inclusion of evanescent $\epsilon$-scalar particle contributions needed in quasi-dimensional methods such as DRED and Four Dimensional Helicity (FDH) cancel out in the determination of the ultraviolet (UV) structure of the models we study. Subtleties related to Lorentz algebra contractions/symmetric integrations inside divergent integrals as well as renormalisation schemes are carefully discussed within IREG where the renormalisation constants are fully defined as basic divergent integrals to arbitrary loop order. Moreover we confirm the hypothesis that momentum routing invariance in the loops of Feynman diagramas implemented via setting well-defined surface terms to zero deliver non-abelian gauge invariant amplitudes within IREG just as it has been proven for abelian theories

Impacto ambiental da concentração de suínos na microbacia hidrográfica do Rio Fragosos.

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Efficient Enzymatic Preparation of Flavor Esters in Water

A straightforward biocatalytic method for the enzymatic preparation of different flavor esters starting from primary alcohols (e.g., isoamyl, n-hexyl, geranyl, cinnamyl, 2-phenethyl, and benzyl alcohols) and naturally available ethyl esters (e.g., formate, acetate, propionate, and butyrate) was developed. The biotransformations are catalyzed by an acyltransferase from Mycobacterium smegmatis (MsAcT) and proceeded with excellent yields (80-97%) and short reaction times (30-120 min), even when high substrate concentrations (up to 0.5 M) were used. This enzymatic strategy represents an efficient alternative to the application of lipases in organic solvents and a significant improvement compared with already known methods in terms of reduced use of organic solvents, paving the way to sustainable and efficient preparation of natural flavoring agents

Minimal cubic cones via Clifford algebras

We construct two infinite families of algebraic minimal cones in $R^{n}$. The first family consists of minimal cubics given explicitly in terms of the Clifford systems. We show that the classes of congruent minimal cubics are in one to one correspondence with those of geometrically equivalent Clifford systems. As a byproduct, we prove that for any $n\ge4$, $n\ne 16k+1$, there is at least one minimal cone in $R^{n}$ given by an irreducible homogeneous cubic polynomial. The second family consists of minimal cones in $R^{m^2}$, $m\ge2$, defined by an irreducible homogeneous polynomial of degree $m$. These examples provide particular answers to the questions on algebraic minimal cones posed by Wu-Yi Hsiang in the 1960's.Comment: Final version, corrects typos in Table

Avaliação do consumo de água no Sistema Intensivo de Suínos Criados ao Ar Livre - SISCAL.

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