Spectral mapping of brain functional connectivity from diffusion imaging.

Understanding the relationship between the dynamics of neural processes and the anatomical substrate of the brain is a central question in neuroscience. On the one hand, modern neuroimaging technologies, such as diffusion tensor imaging, can be used to construct structural graphs representing the architecture of white matter streamlines linking cortical and subcortical structures. On the other hand, temporal patterns of neural activity can be used to construct functional graphs representing temporal correlations between brain regions. Although some studies provide evidence that whole-brain functional connectivity is shaped by the underlying anatomy, the observed relationship between function and structure is weak, and the rules by which anatomy constrains brain dynamics remain elusive. In this article, we introduce a methodology to map the functional connectivity of a subject at rest from his or her structural graph. Using our methodology, we are able to systematically account for the role of structural walks in the formation of functional correlations. Furthermore, in our empirical evaluations, we observe that the eigenmodes of the mapped functional connectivity are associated with activity patterns associated with different cognitive systems

Modelo automatizado de cuota de ventas en HPE

El presente documento muestra la intensión de realizar un proyecto de intervención en Hewlett Packard Enterprise (HPE) a través del desarrollo de un modelo automatizado de distribución de cuotas de ventas para los vendedores de México que atienden al segmento de cuentas de clientes clave (con ingresos superiores a los $25 millones de dólares anuales), que constituya una mejora en el proceso contra años anteriores, y que se convierta una herramienta para que los planeadores puedan dar soporte a los líderes de cada una de estas cuentas en México.ITESO, A.C

Intermediation for technology diffusion and user innovation in a developing rural economy:a social learning perspective

Technology intermediaries are seen as potent vehicles for addressing perennial problems in transferring technology from university to industry in developed and developing countries. This paper examines what constitutes effective user-end intermediation in a low-technology, developing economy context, which is an under-researched topic. The social learning in technological innovation framework is extended using situated learning theory in a longitudinal instrumental case study of an exemplar technology intermediation programme. The paper documents the role that academic-related research and advisory centres can play as intermediaries in brokering, facilitating and configuring technology, against the backdrop of a group of small-scale pisciculture businesses in a rural area of Colombia. In doing so, it demonstrates how technology intermediation activities can be optimized in the domestication and innofusion of technology amongst end-users. The design components featured in this instrumental case of intermediation can inform policy making and practice relating to technology transfer from university to rural industry. Future research on this subject should consider the intermediation components put forward, as well as the impact of such interventions, in different countries and industrial sectors. Such research would allow for theoretical replication and help improve technology domestication and innofusion in different contexts, especially in less-developed countries

Translucent perovskite photovoltaics for building integration

Transparent photovoltaics provide diverse levels of average visible transmittance (AVT) along with concurrent light harvesting, making glass façades and windows accessible for photovoltaics. However, improvements in power conversion efficiency (PCE) and aesthetics are required to enhance commercial viability and public acceptance. This work presents the scalable fabrication of efficient micro-patterned translucent perovskite photovoltaics at optical qualities suited for building integration. Optimized laser-scribed transparent areas (25 μm) mitigate detrimental effects on electrical performance, featuring perovskite solar cells with 44% AVT and demonstrating industrial glass quality through neutral color rendering (CRI 97) and only 3% haze. Highlighting scalability, submodules yield PCEs of 9.0% at 32% AVT (4 cm2 aperture area). The transfer to two-terminal perovskite–perovskite tandem solar cells exhibiting PCEs of 17.7% at 12% AVT and 11.1% at 31% AVT demonstrates the first translucent perovskite tandem photovoltaics. Lastly, the novel concept of transmittance gradients with 7% cm−1 absolute change in AVT and 12.0% PCE for submodules is presented, providing a foundation for architectural individualizations

Time-Expanded F-OTDR based on binary sequences

In this paper, the capabilities of time-expanded phase-sensitive optical time-domain reflectometry (TE F-OTDR) using binary sequences are demonstrated. We present a highly flexible and integrable TE F-OTDR approach that allows a customized distributed optical fiber sensor (range, spatial resolution, and acoustic sampling) by simply changing the length of the binary sequence and the reference clock frequencies of the binary sequence generators. The here presented architecture eliminates the need for the cumbersome arbitrary signal generators used to date to create the dual-comb spectra for interrogating the fiber. In this approach, the use of large binary sequences allows us to obtain dual combs in a simple and cost-effective way. Spatial resolution of ~1 cm is achieved, attaining ~15, 000 independent measurements points along the interrogated fiber, with a capability of sensing ~30, 000 measurements points

Liturgusa maya, Saussure & Zehntner, 1894 (Mantodea-Liturgusidae), una especie de mantis frecuente en cultivos de cacao en la región Tumbes, Perú

Liturgusa maya es una especie criptica que se desplaza sobre tallos de cacao y cítricos. El objetivo de este estudio fue determinar algunos aspectos de su biología y comportamiento e identificar parasitoides de ootecas. Se colectaron ninfas y adultos en los tallos de cacao para obtener ootecas y determinar el periodo de incubación y el número de individuos por ooteca, igualmente se colectaron ootecas para determinar la presencia de parasitoides. La incubación fluctúa entre 15 y 17 días y los individuos por ooteca entre 23 y 37. El estado adulto hembra mide en promedio 25,30 mm de longitud y el macho 20,38. De las ootecas colectadas en campo se recuperaron tres especies de parasitoides: Podagrion sp., Eupelmus sp., y Horismenus sp., pertenecientes a las familias Torymidae, Eupelmidae y Eulophidae, la especie más importante pertenece al género Horismenus.  Con el presente estudio se busca establecer las interacciones que L. maya cumple en el agroecosistema de cacao y definir si su presencia guarda relación en el manejo de cultivos orgánicos