Early resistance change and stress/electromigration evolution in near bamboo interconnects

A complete description for early resistance change and mechanical stress evolution in near-bamboo interconnects, related to the electromigration, is given in this paper. The proposed model, for the first time, combines the stress/vacancy concentration evolution with the early resistance change of the Al line with a near-bamboo microstructure, which has been proven to be a fast technique for prediction of the MTF of a line compared to the conventional (accelerated) stres

Neutralization of Fuel Tankering Emissions for Environmental Sustainability

As aviation has been one of the fastest-growing sources of emissions, this paper explores sustainable solutions in the equation of the economic savings from the fuel tankering practice, in a way it could represent gains of credibility for this industry (Boussauw & Vanoutrive, 2019). The fuel expenses in Brazil have been responsible for the highest operational cost for the airlines and, as a result, there has been an ongoing pursuit of the highest level of efficiency (ANAC, 2019). In this context, this study has been focused on the emerging Brazilian aviation market, and uses primary data collected from three major airlines in 2019, representing approximately 92% of the Brazilian domestic market share. This research project assessed the total fuel tankering quantity data used by Brazilian airline industry in 2019 and explains the total carbon emission that emitted in 2019 related to fuel tinkering. The project also evaluated and compared the Brazilian fuel tankering scenario against the global scenario, appraised the average cost of carbon to neutralize the fuel tankering used by purchasing carbon credits and recommend support solutions for the adjustment of savings incorporating the neutralization of carbon emissions. Some of our recommendations include the levelling of the State taxes in order to reduce the need for airlines to apply procedures that negatively affect the environment, and the implementation of carbon emission compensation/neutralization policies

Aviation Fuel Tankering and Sustainability: The Brazilian Scenario

This research project aims to investigate fuel tankering practices in the aviation industry, exploring their relation to carbon emissions and evaluating the Brazilian fuel tankering scenario in comparison to global and national policies and regulations. The study recommends sustainable national measures and compares global practices for minimizing the higher emissions due to fuel tankering. The results of the study show that the Brazilian aviation industry can sustainably neutralize the carbon emissions from the fuel tankering practice. The study recommends that airlines allocate part of the savings generated to purchasing carbon credits to offset the carbon emitted. Future research should focus on all members of the aviation ecosystem and external factors, including the fuel tankering post-pandemic scenario, the development of biofuels, and the global, cross-country analysis of fuel tankering strategies and their managerial processes

Operational feasibility and mobility outcome from eVTOL based on existing air infrastructure

This study aimed to assess the operational feasibility and air mobility outcomes of introducing Electric Vertical Take-Off and Landing (eVTOL) vehicles in São Paulo City and the surrounding metropolitan area, utilizing the existing infrastructure of helipads and heliports. We analyzed the technical specifications of five eVTOL models capable of carrying at least four passengers to determine their compatibility with the 308 existing helipads in São Paulo. The results showed that between 64% and 99% of possible routes could be achieved by the eVTOL models, leading to increased air mobility benefits. Our findings suggest that integrating eVTOLs can be a crucial strategy in global efforts to reduce greenhouse gas emissions, as outlined in the Paris Agreement of 2015. Financial mechanisms such as carbon credits and carbon offsets, which have existed since the Kyoto Protocol of 1997 can support this transition. Replacing helicopters with eVTOL aircraft could significantly reduce CO2 emissions, generating up to $1.3 million in carbon credits annually per eVTOL. A cost-benefit analysis revealed that the acquisition costs of EVTOLs are 77% lower than those of equivalent helicopters. Additionally, eVTOLs have the potential to alleviate São Paulo\u27s severe traffic congestion by reducing the number of cars on the road by an average of 8.6%, resulting in the avoidance of 52 million tons of CO2 emissions over ten years. The results of this study provide valuable insights and recommendations for policymakers and aviation stakeholders to integrate eVTOLs into São Paulo\u27s transportation system seamlessly

Benefits associated with improving fatigue regulations for cargo pilots

This study investigated the potential business benefits of improving fatigue regulations for cargo pilots in Brazil. The research objectives were to compare fatigue levels between cargo and passenger operations, identify regulatory inefficiencies for cargo operators, simulate proposed changes, and analyze cost scenarios. The experimental design involved a review of fatigue regulations in Brazil and the USA, analyzing pilot scheduling data, and the creation of hypothetical flexible scheduling scenarios for 70 pilots flying 16,500 hours annually. We reviewed NTSB data on fatigue-related incidents in US cargo operations with flexible regulations and from the fatigue program of LATAM Cargo. Comparisons between the USA and the rest of the world showed that the rate of accidents per number of cargo flights in the USA is below average, with most accidents not attributed to fatigue. The results indicated that aligning with the US CFR 117 could improve cargo pilot availability in Brazil by 34.28%, with a potential cost savings of up to $3.6 million for an airline of that size. This research highlights the importance of flexibility and adaptation in fatigue management and mental health programs for pilots in the aviation industry, particularly cargo operations. Introducing more flexible fatigue regulations for cargo pilots could lead to operational efficiencies and potential cost savings without compromising safety. Further research needs to explore the impacts of these changes on passenger operations and to gather feedback from pilots and unions regarding extended pilot schedules. The proposed regulatory changes focused on maximum duty time, flight hours, rest periods, and monthly/annual limits

Effects of Goji berries supplementation on the productive performance of rabbit

Abstract Recognized by the traditional medicine and recent scientific research studies, Lycium barbarum berries (Goji berries) have beneficial effects on human and animal health. The aim of our study was to evaluate the effects of Goji berries on the productive performance of rabbits. One month before insemination, 60 New Zealand White does were randomly assigned to one of the following 3 dietary treatments: commercial standard diet (C); C supplemented with 1% Goji berries (LG); and C supplemented with 3% Goji berries (HG). After weaning up to 91 days of age, 15 randomly selected rabbits/group were fed the same diet as the mothers (C, LG, and HG). Non-pregnant and lactating does of C group showed the highest feed intake (P < 0.01), although no significant differences in body weight (BW) were observed between groups. Nutritional treatment did not affect the offspring's feed intake. However, the rabbits fed with Goji supplementation showed not only higher mean BW both during growth (P < 0.001) and at slaughter (P < 0.01), but also better feed conversion ratio (FCR; P < 0.01) than the control group. Rabbits of LG group showed the best performances in the pre-weaning period which was probably related to the highest milk production of the LG does (P < 0.001). Indeed, LG group showed lower pre-weaning mortality (P < 0.05), higher litter size (P < 0.05), and higher litter weight (P < 0.05) at day 18 as well as higher litter size at weaning (P = 0.05) compared to C group. In conclusion, the present study demonstrates that a low percentage of dietary supplementation with Goji berry improves both reproductive and productive traits of rabbits. Although further studies are needed, our study paves the way for the use of Goji berries in the rabbit nutrition

PAPER Long-chain fatty acid uptake is upregulated in omental adipocytes from patients undergoing bariatric surgery for obesity

OBJECTIVE: To determine the impact of obesity on adipocyte cell size and long-chain fatty acid (LCFA) uptake kinetics in human subjects undergoing laparoscopic abdominal surgery. SUBJECTS: A total of 10 obese patients (BMI 49.8711.9 (s.d.) kg/m 2 ) undergoing laparoscopic bariatric surgery, and 10 nonobese subjects (BMI 24.272.3 kg/m 2 ) undergoing other clinically indicated laparoscopic abdominal surgical procedures. MEASUREMENTS: Cell size distribution and [ 3 H]oleic acid uptake kinetics were studied in adipocytes isolated from omental fat biopsies obtained during surgery. Adipocyte surface area (SA) was calculated from the measured cell diameters. Plasma leptin and insulin concentrations were measured by RIA in fasting blood samples obtained on the morning of surgery. RESULTS: The mean SA of obese adipocytes (41 50875381 m 2 /cell) was increased 2.4-fold compared to that of nonobese adipocytes (16 92876529 m 2 /cell; Po0.01). LCFA uptake in each group was the sum of saturable and nonsaturable components. Both the V max of the saturable component (21.376.3 vs 5.171.9 pmol/s/50 000 cells) and the rate constant k of the nonsaturable component (0.01570.002 vs 0.006670.0023 ml/s/50 000 cells) were increased (Po0.001) in obese adipocytes compared with nonobese controls. When expressed relative to cell size, V max /m 2 SA was greater in obese than nonobese adipocytes (Po0.05), whereas k/m 2 SA did not differ between the groups. CONCLUSION: The data support the concepts that (1) adipocyte LCFA uptake consists of distinct facilitated (saturable) and diffusive processes; (2) increased saturable LCFA uptake in obese adipocytes is not simply a consequence of increased cell size, but rather reflects upregulation of a facilitated transport process; and (3) the permeability of adipocyte plasma membranes to LCFA is not appreciably altered by obesity, and increased nonsaturable uptake in obese adipocytes principally reflects an increase in cell SA. Regulation of saturable LCFA uptake by adipocytes may be an important control point for body adiposity

Topological Photonics

Topology is revolutionizing photonics, bringing with it new theoretical discoveries and a wealth of potential applications. This field was inspired by the discovery of topological insulators, in which interfacial electrons transport without dissipation even in the presence of impurities. Similarly, new optical mirrors of different wave-vector space topologies have been constructed to support new states of light propagating at their interfaces. These novel waveguides allow light to flow around large imperfections without back-reflection. The present review explains the underlying principles and highlights the major findings in photonic crystals, coupled resonators, metamaterials and quasicrystals.Comment: progress and review of an emerging field, 12 pages, 6 figures and 1 tabl