Solar energy conversion

If solar energy is to become a practical alternative to fossil fuels, we must have efficient ways to convert photons into electricity, fuel, and heat. The need for better conversion technologies is a driving force behind many recent developments in biology, materials, and especially nanoscience

How to Collect your Water Sample and Interpret the Results for the Fish Pond Analytical Package

The Arkansas Water Resources Center (AWRC) in cooperation with the Cooperative Extension Service offers several analytical packages to assess the quality of your water resources. This document is intended to provide guidance to aquaculture producers and pond owners on the “Fish Pond Report” provided by the AWRC’s water quality laboratory. The information contained within this fact sheet should be used as general guidance, and the reader is encouraged to seek advice from Extension specialists regarding the interpretation of individual reports and water testing results that may be of concern. The Aquaculture Center for Excellence is at the University of Arkansas at Pine Bluff, see aqfi.uaex.edu for more information and fisheries contact

Depleted by Debt: “Green” Microfinance, Over-Indebtedness, and Social Reproduction in Climate-Vulnerable Cambodia

The operations of microfinance are exalted in mainstream development thinking as a key means of supporting smallholder farmers facing growing crises of agricultural productivity in the context of daily, ongoing, and often slow-onset climate disasters. Microfinance products and services are claimed to enhance coping and adaptative capacity by facilitating both risk recovery and reduction. Challenging the status quo, this paper brings together original and mixed-method data collected between 2020 and 2022 in Cambodia to critically examine the “green finance” agenda by highlighting the ways in which microfinance contributes to reproducing and exacerbating climate precarity and harm for many. We evidence how credit-taking can lead to more dangerous and individualised efforts to cope with, and adapt to, existing conditions at home, often at the cost of emotional and bodily depletion. By doing so, we contribute to answering calls for connecting literatures and thinking on social reproduction, depletion, and climate change adaptation

2006 SQ372: A Likely Long-Period Comet from the Inner Oort Cloud

We report the discovery of a minor planet (2006 SQ372) on an orbit with a perihelion of 24 AU and a semimajor axis of 796 AU. Dynamical simulations show that this is a transient orbit and is unstable on a timescale of 200 Myrs. Falling near the upper semimajor axis range of the scattered disk and the lower semimajor axis range of the Oort Cloud, previous membership in either class is possible. By modeling the production of similar orbits from the Oort Cloud as well as from the scattered disk, we find that the Oort Cloud produces 16 times as many objects on SQ372-like orbits as the scattered disk. Given this result, we believe this to be the most distant long-period comet ever discovered. Furthermore, our simulation results also indicate that 2000 OO67 has had a similar dynamical history. Unaffected by the "Jupiter-Saturn Barrier," these two objects are most likely long-period comets from the inner Oort Cloud

PARENTS' SATISFACTION AND DISSATISFACTION WITH THEIR CHILDREN'S DENTIST *

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/66344/1/j.1752-7325.1973.tb03989.x.pd

Sensory percepts elicited by chronic macro-sieve electrode stimulation of the rat sciatic nerve

Objective: Intuitive control of conventional prostheses is hampered by their inability to provide the real-time tactile and proprioceptive feedback of natural sensory pathways. The macro-sieve electrode (MSE) is a candidate interface to amputees’ truncated peripheral nerves for introducing sensory feedback from external sensors to facilitate prosthetic control. Its unique geometry enables selective control of the complete nerve cross-section by current steering. Unlike previously studied interfaces that target intact nerve, the MSE’s implantation requires transection and subsequent regeneration of the target nerve. Therefore, a key determinant of the MSE’s suitability for this task is whether it can elicit sensory percepts at low current levels in the face of altered morphology and caliber distribution inherent to axon regeneration. The present in vivo study describes a combined rat sciatic nerve and behavioral model developed to answer this question.Approach: Rats learned a go/no-go detection task using auditory stimuli and then underwent surgery to implant the MSE in the sciatic nerve. After healing, they were trained with monopolar electrical stimuli with one multi-channel and eight single-channel stimulus configurations. Psychometric curves derived by the method of constant stimuli (MCS) were used to calculate 50% detection thresholds and associated psychometric slopes. Thresholds and slopes were calculated at two time points 3 weeks apart.Main Results: For the multi-channel stimulus configuration, the average current required for stimulus detection was 19.37 μA (3.87 nC) per channel. Single-channel thresholds for leads located near the nerve’s center were, on average, half those of leads located near the periphery (54.92 μA vs. 110.71 μA, or 10.98 nC vs. 22.14 nC). Longitudinally, 3 of 5 leads’ thresholds decreased or remained stable over the 3-week span. The remaining two leads’ thresholds increased by 70–74%, possibly due to scarring or device failure.Significance: This work represents an important first step in establishing the MSE’s viability as a sensory feedback interface. It further lays the groundwork for future experiments that will extend this model to the study of other devices, stimulus parameters, and task paradigms

The hidden burden of adult allergic rhinitis : UK healthcare resource utilisation survey

Funding Funding for this survey was provided by Meda Pharma.Peer reviewedPublisher PD

Depleted by debt: ‘green’ microfinance, over-indebtedness, and social reproduction in climate-vulnerable Cambodia

The operations of microfinance are exalted in mainstream development thinking as a key means of supporting smallholder farmers facing growing crises of agricultural productivity in the context of daily, ongoing, and often slow-onset climate disasters. Enhancing coping and adaptative capacity, the provision of microfinance products and services would facilitate adaptation by facilitating both risk recovery and reduction. Bringing together original and mixed-method data collected between 2020-2022 in Cambodia, this paper critically examines this ‘green microfinance’ narrative by highlighting the ways in which microfinance contributes to reproducing and exacerbating climate precarity and harm for many. We evidence how credit-taking can lead to more dangerous and individualised efforts to cope with, and adapt to, existing conditions at home, often at the cost of emotional and bodily depletion. By doing so, we contribute to answering calls for connecting the literatures on social reproduction, depletion, and climate change adaptation

CMB-S4 Science Book, First Edition

This book lays out the scientific goals to be addressed by the next-generation ground-based cosmic microwave background experiment, CMB-S4, envisioned to consist of dedicated telescopes at the South Pole, the high Chilean Atacama plateau and possibly a northern hemisphere site, all equipped with new superconducting cameras. CMB-S4 will dramatically advance cosmological studies by crossing critical thresholds in the search for the B-mode polarization signature of primordial gravitational waves, in the determination of the number and masses of the neutrinos, in the search for evidence of new light relics, in constraining the nature of dark energy, and in testing general relativity on large scales

Lipopolysaccharides of brucella abortus and brucella melitensis induce nitric oxide synthesis in rat peritoneal macrophages

Producción CientíficaSmooth lipopolysaccharide (S-LPS) and lipid A of Brucella abortus and Brucella melitensis induced the production of nitric oxide (NO) by rat adherent peritoneal cells, but they induced lower levels of production of NO than Escherichia coli LPS. The participation of the inducible isoform of NO synthase (iNOS) was confirmed by the finding of an increased expression of both iNOS mRNA and iNOS protein. These observations might help to explain (i) the acute outcome of Brucella infection in rodents, (ii) the low frequency of septic shock in human brucellosis, and (iii) the prolonged intracellular survival of Brucella in humans.This work was supported by (grants FIS 96/1017, SAF96-0144, and SAF98-0176