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4,212 result(s) for "Rain-water (Water-supply)"
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Analysis of the northern pitcher plant
The insectivorous Northern Pitcher Plant, Sarracenia purpurea, recruits a dynamic biotic community in the rainwater collected by its pitcher-shaped leaves. Insect capture and degradation within the pitcher fluid (phytotelma) has been well documented as a mechanism for supplementing the plant's nitrogen, phosphorous, and micronutrient requirements. Metagenomic studies have shown a diverse microbiome in this phytotelm environment, including taxa that contribute metabolically to prey digestion. In this investigation, we used high-throughput 16S rDNA sequencing and bioinformatics to analyze the S. purpurea phytotelm bacteriome as it changes through the growing season (May-September) in plants from the north-central region of the species' native range. Additionally, we used molecular techniques to detect and quantify bacterial nitrogenase genes (nifH) in all phytotelm samples to explore the hypothesis that diazotrophy is an additional mechanism of supplying biologically available nitrogen to S. purpurea. The results of this study indicate that while prokaryote diversity remains relatively stable in plants at different locations within our region, diversity changes significantly as the growing season progresses. Furthermore, nifH genes were detected at biologically significant concentrations in one hundred percent of samples, suggesting that nitrogen fixation may be an important contributor to the S. purpurea nutrient budget.
Effects of COsub.2 Curing on the Properties of Pervious Concrete in Different Paste–Aggregate Ratios
To improve the comprehensive performance of pervious concrete, the properties of pervious concrete in different paste–aggregate ratios were subjected to both early CO[sub.2] curing and uncarbonated curing conditions. The mechanical properties, water permeability, porosity, and chemical composition of pervious concrete under two curing conditions were investigated and compared. The effects of CO[sub.2] curing on the properties of pervious concrete with different paste–aggregate ratios were derived. Through mechanical experiments, it was revealed that early CO[sub.2] curing can enhance the mechanical strength of pervious concrete by about 15–18%. Meanwhile, with the increase in the paste–aggregate ratio, the improvement effect induced by early CO[sub.2] curing became more significant. The water resistance of carbonated concrete was not significantly reduced. And with the increase in the paste–aggregate ratio, the carbonation degree of pervious concrete was reduced; the differences in porosity and water resistance became less significant when the paste–aggregate ratio exceeded 0.39. Micro-structural analysis shows that the early CO[sub.2] curing reduced both total porosity and the volume of micropores with a pore diameter of less than 40 nm, while it increased the volume of pores with a diameter of more than 40 nm. This is also the main reason that the strength of pervious concrete under early CO[sub.2] curing is higher than that without CO[sub.2] curing. The effect of varying paste–aggregate ratio and curing methods adds to the limited knowledge of the performance of pervious concrete.
Urban Landscape Features Influence the Movement and Distribution of the Australian Container-Inhabiting Mosquito Vectors Aedes aegypti
Urban landscape features play an important role in the distribution and population spread of mosquito vectors. Furthermore, current insecticide and novel rear-and-release strategies for urban mosquito management rarely consider the spatial structure of the landscape when applying control practices. Here, we undertake a mark-recapture experiment to examine how urban features influence the movement and distribution of Australian container-inhabiting Aedes vectors. We pay attention to the role of semipermanent water storage containers, called rainwater tanks, and the influence of movement barriers, such as roads, on the spread and distribution of vector populations. Results suggest that Aedes aegypti (Linnaeus) (Diptera: Culicidae) were more likely to be captured around rainwater tanks, and that released males travel throughout residential blocks but do not cross roads. Conversely, female Aedes notoscriptus (Skuse) (Diptera: Culicidae) movement was uninhibited by roads and rainwater tanks did not influence female distribution or oviposition behavior. Using an isotropic Gaussian kernel framework, we show that vector movement is likely to be greater when applying a temporal effect, than when estimated by traditional methods. We conclude that a greater understanding on the role of urban features on vector movement will be important in the new age of rear-and-release mosquito control strategies, particularly those where estimations of movement are important for ensuring efficacy of application.
Dual hydrophilic/hydrophobic SiO.sub.2 transparent super-hydrophobic coating with good interfacial adhesion and high mechanical robustness
Water is identified as the main culprit of damage for sandstone cultural relics because of their porous intrinsic structure and nature-exposed feature. Thus, developing a super-hydrophobic coating, simultaneously with transparency, good interfacial adhesion, and robust mechanical properties, is especially critical for long-term application. However, the difficulty of balancing the contradictions between various performances is a tricky issue. Herein, tiny-level addition of amino-modified SiO.sub.2 was used to promote the dispersibility of fluorinated SiO.sub.2 in super-hydrophobic coating via the attachment of amino groups that was able to form hydrogen-bonding interactions, also contributing to the improved interfacial adhesion between coating and sandstone substrate. Moreover, when mass ratio of amino-modified SiO.sub.2 to fluorinated SiO.sub.2 reaches 1:100, the coating provides the best transparency, the optimal resistances to tape peeling, sandpaper abrasion, sand and rainwater impactions, superior than coating with perfluorinated SiO.sub.2 particles. This mainly associates with the construction of uniform and small undulating rough surface that increases water repellency and reduces light scattering, as well as the formation of stable skeleton of \"rigid-flexible\" SiO.sub.2/polydimethylsiloxane that transfers stress and dissipates energy effectively. The simple and effective strategy well solves the performance conflict and has the potential to be applied in large scale for protection of sandstone cultural relics.
Sustainable Smart Irrigation System
The project aims to develop a sustainable smart irrigation system (SIS) for the indoor plant irrigation by integrating photovoltaic (PV), internet of things (IoT), and rainwater harvesting techniques. The addressed problem involves the inconsistency and tediousness of manual watering, emphasizing the need for a sustainable design for a SIS. The IoT system consists of soil moisture sensor with GSM module powered by PV and an algorithm was developed to adjust irrigation schedules based on soil moisture data. The objectives of this project are to design and optimize the PV-powered irrigation system and implement an Arduino-enabled automatic system with SMS-triggered functionality. The methodology involves system modelling for water requirements and sizing of PV, battery, pump, and MPPT based on the load demand. The rainwater harvesting structure designed ensures water sustainability for plants' irrigation. The system is then implemented using moisture and ultrasonic sensors managed by Arduino Uno embedded system. The electrical performance of the PV was analyzed on both cloudy and moderately luminous days, with irradiance ranging from 250.4 to 667.8 and 285.5 to 928 W/m.sup.2, respectively. The average output voltage and current of the battery were observed to be 13.04 V and 0.37 A (cloudy), and 13.45 V and 0.47 A (moderate) days, respectively. The rainwater collection test revealed more than 36 L in the tank after one week, indicating it could sustain watering the three plants for 72 days. Based on the analysis, the project can save 14.97 kgCO.sub.2 emissions per year compared to the current emissions released into the environment. The overall cost of the system is approximately RM670 (US$139.50). The SIS aligns with SDG 7, promoting affordable and integrates with 12.sup.th Malaysia Plan for more efficient and environmentally friendly agricultural and water management practices.
Rainwater Harvesting and Treatment: State of the Art and Perspectives
Rainwater harvesting is an ancient practice currently used for flood and drought risk mitigation. It is a well-known solution with different levels of advanced technology associated with it. This study is aimed at reviewing the state of the art with regards to rainwater harvesting, treatment, and management. It focuses on the environmental and social benefits of rainwater harvesting and links them to the Sustainable Development Goals. The review identifies characteristics of laws and regulations that encourage this practice and their current limitations. It presents methodologies to design a rainwater harvesting system, describes the influence of design variables, and the impact of temporal and spatial scales on the system’s performance. The manuscript also analyzes the most advanced technologies for rainwater treatment, providing insights into various processes by discussing diverse physiochemical and biological technology options that are in the early stages of development. Finally, it introduces trends and perspectives which serve to increase rainwater harvesting, water reuse, and effective management.
Trifluoroacetic acid deposition from emissions of HFO-1234yf in India, China, and the Middle East
We have investigated trifluoroacetic acid (TFA) formation from emissions of HFO-1234yf (CF3CFH2), its dry and wet deposition, and rainwater concentration over India, China, and the Middle East with GEOS-Chem and WRF-Chem models. We estimated the TFA deposition and rainwater concentrations between 2020 and 2040 for four previously published HFO-1234yf emission scenarios to bound the possible levels of TFA. We evaluated the capability of GEOS-Chem to capture the wet deposition process by comparing calculated sulfate in rainwater with observations. Our calculated TFA amounts over the USA, Europe, and China were comparable to those previously reported when normalized to the same emission. A significant proportion of TFA was found to be deposited outside the emission regions. The mean and the extremes of TFA rainwater concentrations calculated for the four emission scenarios from GEOS-Chem and WRF-Chem were orders of magnitude below the no observable effect concentration. The ecological and human health impacts now, and the continued use of HFO-1234yf in India, China, and the Middle East, are estimated to be insignificant based on the current understanding, as summarized by Neale et al. (2021).
Entomological survey to determine the role of cisterns in the production of Aedes aegypti in the U.S. Virgin Islands
Given the limited potable water supply in the U.S. Virgin Islands, most residents use cisterns to collect rainwater and store it for their daily needs. A survey conducted in 2019 found that 45.7% of the cisterns contained mosquitoes, and 83.3% of the mosquitoes collected were Aedes aegypti , suggesting an important role as mosquito larval development sites. A subsequent entomological survey was designed to determine the importance of cisterns in producing Ae. aegypti mosquitoes and to understand the cistern factors and characteristics that influence productivity. Three floating funnel traps were installed inside each sampled cistern to collect immature mosquitoes, and exit traps were installed on the intake spouts and overflow pipes, when possible, to collect adult mosquitoes. Physical and chemical characteristics were also recorded. Yard and outdoor patio inspections were conducted at participating households to identify other types of containers with immature mosquitoes. A total of 1,858 households were visited, of which 24% granted access to their cisterns for this study. Of these, 76% of cisterns met protocol criteria, which resulted in 342 cisterns being sampled. Approximately half of the cisterns surveyed were positive for immature mosquitoes. A higher percentage was observed on the St. Thomas and St. John islands (STT District, 57.3%) than St. Croix (STX District, 40.9%). Most immature mosquitoes collected were Ae. aegypti (89.2%), followed by Culex spp . (1.3%), and Ae. mediovittatus (0.38%). Pupal surveys revealed that cisterns were the second highest contributor to the production of Ae. aegypti pupae, with 16.9% of the pupae collected from cisterns. However, this number might be underestimated given sampling limitations. Buckets were the highest Ae. aegypti pupal producer with 47.3%. On average, 5.8% of the exit traps installed on cisterns captured adult mosquitoes, with higher rates of capture on the STT district than on the STX (6.4% versus 5.3%, respectively). Most adult mosquitoes collected (90.7%) were identified as Ae. aegypti, while the other 9.2% were Culex spp . We can conclude that cisterns are important larval development sites for Ae. aegypti and vector management strategies must be developed to reduce their impact.
Rainwater Charitable Foundation criteria for the neuropathologic diagnosis of progressive supranuclear palsy
Neuropathologic criteria for progressive supranuclear palsy (PSP) proposed by a National Institute of Neurological Disorders and Stroke (NINDS) working group were published in 1994 and based on the presence of neurofibrillary tangles in basal ganglia and brainstem. These criteria did not stipulate detection methods or incorporate glial tau pathology. In this study, a group of 14 expert neuropathologists scored digital slides from 10 brain regions stained with hematoxylin and eosin (H&E) and phosphorylated tau (AT8) immunohistochemistry. The cases included 15 typical and atypical PSP cases and 10 other tauopathies. Blinded to clinical and neuropathological information, raters provided a categorical diagnosis (PSP or not-PSP) based upon provisional criteria that required neurofibrillary tangles or pretangles in two of three regions (substantia nigra, subthalamic nucleus, globus pallidus) and tufted astrocytes in one of two regions (peri-Rolandic cortices, putamen). The criteria showed high sensitivity (0.97) and specificity (0.91), as well as almost perfect inter-rater reliability for diagnosing PSP and differentiating it from other tauopathies (Fleiss kappa 0.826). Most cases (17/25) had 100% agreement across all 14 raters. The Rainwater Charitable Foundation criteria for the neuropathologic diagnosis of PSP feature a simplified diagnostic algorithm based on phosphorylated tau immunohistochemistry and incorporate tufted astrocytes as an essential diagnostic feature.