Spray Duration Research Articles

An Investigation into Using CFD for the Estimation of Ship Specific Parameters for the SPICE Model for the Prediction of Sea Spray Icing: Part 2—The Verification of SPICE2 with a Full-Scale Test

A hybrid CFD–ML model for the prediction of sea spray icing, SPICE2, was developed in Part 1 of this study in Deshpande et al., 2024. The SPICE2 model is an extension of the ML model, SPICE, where some of the variables required for icing rate predictions: local wind speed, spray duration, spray period, and spray flux, are computed from CFD simulations. These, along with the air and water temperatures, and the salinity from the metocean data are used for the prediction of icing rates at different locations on a moving vessel. The existing full-scale icing measurements proved to be not detailed enough for the purpose of the verification of sea spray icing prediction models and the verification of the SPICE2 required distribution of sea spray icing data on the vessel surface in addition to the vessel design for simulation. A full-scale sea spray icing test was conducted in 2018 by Sundsbø et al. on a fully enclosed lifeboat equipped for the Goliat field in the Barents Sea. The 3D design of the same lifeboat, together with the corresponding metocean conditions and ship characteristics was used for the simulation of the vessel-specific parameters required for the verification of the icing rate and distribution prediction from the SPICE2 model against the measured distribution of sea spray icing rates on the lifeboat surface. The availability of the 3D model of this lifeboat, in addition to the fact that the icing measurements from this test were detailed enough to attempt a model verification served the purpose of validating the SPICE2 model. The icing rates measured on this lifeboat are used for the full-scale validation of the SPICE2 model that is proposed in Part 1 of this study. It was seen that the icing rates predicted by SPICE2 concurred with 9 of 13 selected locations on the lifeboat. The ones which did not showed very little deviation from the measurements. The icing rate and distribution prediction with SPICE2 were satisfactorily validated against full-scale icing measurements. This is a first attempt in modelling sea spray generation using CFD and further research into CFD for the estimation of spray flux is suggested.

Evidence-based food serving size labelling: Survey and laboratory analyses of consumer cooking spray usage.

Nutrition label serving sizes are determined primarily based on typical consumption when such data are available. However, such data are not available for certain foods such as spray cooking oil (cooking spray). Our study assessed cooking spray use by the United States (US) adults compared to the 0.25-s serving size used on US-sold cooking spray labels. Adults (n = 1041, aged 33 ± 16.7 years) completed a 13-question survey on cooking spray use and perceptions. In the survey, participants reported using cooking spray for 1.9 ± 0.9 s per use, and 42.3%-43.1% of participants reported being more likely to purchase products if they were labelled calorie- or fat-free. Next, 30 adults (aged 29.7 ± 11.0 years) completed a laboratory-based study which assessed cooking spray durations for seven cookware items. Spray times ranged from 1.0 ± 0.5 (smallest pan) to 2.5 ± 1.3 s (largest baking sheet), with 100% of sprays (210/210) exceeding the 0.25-s US serving size. Our results suggest that cooking spray serving size should be increased to 1 s to better reflect actual consumption, and this would have the added benefit of aligning better with cooking spray serving sizes in other developed countries (0.5-1.0 s). A 1-s serving size would also preclude cooking spray advertised as calorie- or fat-free, allowing consumers to make more informed choices on the dietary implications of using cooking spray.

Rapid Construction of PVA@CDs/SiO2 Fluorescent/Structural Color Dual-Mode Anti-Counterfeiting Labels via Spray-Coating Method.

A method of sequential spraying of polyvinyl alcohol with carbon quantum dots (PVA@CDs) aqueous suspension and SiO2 aqueous suspension is proposed to rapidly prepare multicolor dual-mode anti-counterfeiting labels. With the optimization of the concentration (15%) of colloidal microspheres in the SiO2 aqueous suspension as well as the spraying process parameters (spray distance of 10 cm, spray duration of 3 s, and assembly temperature of 20 °C), different-sized SiO2 microspheres (168 nm, 228 nm, and 263 nm) were utilized to rapidly assemble red, green, and blue photonic crystals. Furthermore, the tunable fluorescence emission of carbon quantum dots endows the labels with yellow, green, and blue fluorescence. The constructed dual-mode labeling was used to develop an anti-counterfeiting code with dual-channel information storage capabilities and also to create dual-mode multicolor anti-counterfeiting labels on various packaging substrates. This work provides a novel solution for anti-counterfeiting packaging and information storage.

Elaboration of spinel Co3O4 via cost-effective chemical spray pyrolysis for enhanced photo-response

Co3O4 thin layers were produced through spray pyrolysis, varying the spray duration from 10 to 25 minutes. Various characterizations were employed to explore the impact of spray durations on the sprayed layers properties. They exhibited a cubic structure with strong preferred orientation along the (111) direction. Morphological analysis indicated a good morphology as the duration increased. Compositional analysis confirmed the predominant presence of Co and O in the growing layer. Optical properties revealed an augmentation in absorption with prolonged duration. The band-gap energy decreased from 1.45 to 1.40 eV for durations from 10 to 20 minutes. The optical and electrical properties were influenced by duration. Notably, Co3O4 (20 minutes) exhibited a significant variation in resistance between light ON and OFF. These findings highlight the ability to tailor the properties of Co3O4 compound by optimizing the spray duration for the effective fabrication of photo-sensors.

Enhanced mechanical and tribological properties of ultrasonically assisted stir-cast AA7075 metal matrix composites in challenging corrosive environments

Aluminum-based metal matrix composites (AMMCs) find extensive applications in aerospace, defence, automotive, and various sectors on account of remarkable mechanical properties, lightweight nature, and excellent dimensional stability. In this research, AA7075 matrix material was reinforced with tungsten carbide ceramic particles with various 0, 5, 10, 15 and 20 weight percentages (wt%) with the use of Ultrasonic assisted stir casing setup. The stir casted AA7075 MMCs were subjected to XRD, SEM, and density test to investigate the presence of elements, microstructure and density. The tensile, micro hardness, and wear test were performed on AL7075 based MMCs after conducting NaCl based spray test at the condition of spray pressure of 1.2 kg cm−2, spray duration of 120 h and PH value of 8.2 to determine the wear resistance, micro hardness and Ultimate Tensile Strength. The XRD test confirmed the presence of secondary phases such as Al2Cu, W2C, and MgZn2 with Al and WC phases. The SEM test confirmed the uniform dispersion and no more cluster formation upto 15 wt% WC addition and agglomeration of WC was occurred in the addition of 20 wt% of WC. The enhancing of wt% of WC improved the corrosion resistance, Micro hardness, UTS, wear and up to 15 wt% addition and decreases by the 20 wt% WC addition. The higher tensile strength 312 MPa was obtained from AA7075/15 wt%WC composite. The lower wear rate 0.11 mg m−1 was obtained from AA7075/15 wt%WC at 1000 m sliding distance with 1.2 m s−1 sliding velocity. The improved mechanical and tribological properties were mainly depended on strengthening mechanisms such as load transfer mechanism and dislocation strengthening mechanism.

Evaluating Lean Combustion Cycle Stability and Emissions in Spark Ignition Engines with Gasoline, Ethanol, and Methanol Blends

Abstract Fuels for vehicles account for a large portion of the world’s total energy demand, which in turn leads to increased carbon emissions. Ethanol and methanol are a fuel with a simple carbon chain and OH- bonds. It has similar properties to gasoline, and ethanol can be made from the fermentation of plant carbohydrates, called bioethanol. The advantage of using bioethanol is that it contributes to carbon neutrality. This paper will investigate the use of three manually blended gasoline ethanol and methanol (GEM) fuels in a spark ignition engine to address cycle-to-cycle variation (CCV), knock potential, and emissions with lean blend conditions. In the experiments conducted, the air-fuel ratio was conditioned lean by utilizing an electronic control unit to adjust the injector spray duration. This experiment provides results that there is a potential for mild knocking on the use of alcohol fuel with lean fuel mixture conditions at engine speed 4000 RPM, while at engine speed 6000 RPM and 8000 RPM the use of GEM tends to be stable, but in the CCV results the increase in COV (coefficient of variation) value using GEM fuel tends to be more sloping, especially with the addition of more methanol. Emission results from the use of GEM produce top emission CO2 value obtained by the E5M15 mixture at λ=1.2 and an engine speed of 8000 RPM, with a value of 13.75% and then peak CO2 emissions at a value of λ = 1.2 whereas in the use of pure gasoline peak CO2 is at a value of λ = 1.1.

Abstract 5745: Electrosprayed minocycline and temozolomide-loaded PLGA microparticles for the treatment of glioblastoma

Abstract Glioblastoma multiforme (GBM), the most common and aggressive form of malignant brain tumor, leads to poor prognoses with high rates of reoccurrence and low survival rates, therefore, it is vital to explore alternative treatments for GBM. Minocycline, a commonly used antibiotic and tetracycline derivative, has proven anti-angiogenic effects and the ability to inhibit tumor growth, making it an effective GBM treatment. Temozolomide is an alkylating antineoplastic agent and the current first-choice chemotherapy agent for GBM. Poly(lactic-co-glycolic acid) (PLGA) is widely used as a biomaterial for drug delivery due to its inert properties, great biocompatibility and versatility and has been approved by the FDA. Therefore, the objective of this project is to fabricate electrosprayed minocycline- and temozolomide-loaded PLGA microparticles with optimal morphology, drug loading, loading efficiency, and drug release kinetics for the treatment of GBM. The microparticles were fabricated by electrospraying vertically with a 2ml/hr flow rate, 14kV voltage, 20 cm distance for minocycline and a 10ml/hr flow rate, 10kV voltage, 10 cm distance for temozolomide with both collected on a copper/glass plate. The parameters that were investigated were the chamber humidity, duration of spraying, and the addition of polyethylene glycol (PEG), a hydrophilic polymer. To determine the microparticles’ morphology, bright-field microscopy and scanning electron microscopy (SEM) were used. The absorbance measurements at 350 and 327 nm were used to determine drug loading, loading efficiency, and release kinetics for minocycline and temozolomide, respectively. Microparticles with low chamber humidity and duration of spraying were more spherical, less aggregated and easier to collect for both drugs. The addition of PEG to minocycline-loaded microparticles led to higher drug loading and loading efficiency (4.02% ± 0.34, 64.30% ± 5.47 vs. 3.23% ± 0.29, 49.40% ± 4.49) as the PEG helps the solubilization of minocycline. Using acetonitrile instead of dichloromethane as the solvent, increased drug loading and loading efficiency (4.72% ± 0.76, 70.77 ± 11.43 vs. 2.37% ± 0.27, 35.62% ± 4.09) for temozolomide-loaded microparticles as more temozolomide can be solubilized in acetonitrile. Drug release kinetics demonstrated a burst release of minocycline in the first hour (65.46%). To decrease the burst release, the microparticles can be incorporated into a scaffold or depot. Overall, electrospraying is a promising method to fabricate drug loaded PLGA microparticles with high drug loading, loading efficiency, and right morphology and we determined optimal parameters to successfully fabricate electrosprayed drug loaded PLGA microparticles in the micron size range with high drug loading and loading efficiency compared to the often-used emulsion solvent extraction/evaporation for microparticle fabrication. Citation Format: Alma Rodriguez, Jaqueline Quintanilla, Juan Amieva, Marco A. Arriaga, Sean Nievera, Ivan Davila, Karen S. Martirosyan, Sue Anne Chew. Electrosprayed minocycline and temozolomide-loaded PLGA microparticles for the treatment of glioblastoma [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2024; Part 1 (Regular Abstracts); 2024 Apr 5-10; San Diego, CA. Philadelphia (PA): AACR; Cancer Res 2024;84(6_Suppl):Abstract nr 5745.

Determining Kidney Damage Risk Factors Associated with Urine Paraquat Levels and Biochemical Urine Profile of Farmers in Banjarbaru, South Kalimantan, Indonesia

Abstract Aim: Kidney damage from paraquat is influenced by several factors, including the duration of work, the span of exposure from the pesticide spraying, and the nutritional status of the farmers. This damage can be indicated by the high levels of paraquat and changes of the biochemical status in the urine. The present study aimed to analyze the relationship between the length of work, duration of spraying, and the nutritional status obtained from the measurement of body mass index (BMI) values, with the paraquat levels and biochemical status of the farmer’s urine samples. Materials and Methods: This study was a cross-sectional study and was conducted in September 2022 in North Landasan Ulin Village, Banjarbaru City, South Kalimantan, Indonesia. The length of work and spraying duration were obtained from the direct interviews, while the BMI values were calculated by dividing the body weight (kg) by the body’s height (m). Analysis of the paraquat levels in the urine was measured using a spectrophotometer, while the urine’s biochemical status was obtained using the dipstick colorimetric method. Statistical analysis used: the relationship between each variable is analyzed using the Spearman rank correlation test. Results: Results from the study show that the length of work, duration of spraying, and BMI were moderately associated with an increase in the urinary paraquat levels (correlation coefficient [Rs] 0.26–0.50) (P < 0.05); although the previous factors did not appear to correlate with any changes in the urine’s biochemical status. Conclusion: In summary, prolonged exposure to the spray in combination with the farmers’ long work hours, and also factoring in the abnormal BMI values, resulted in an increase of paraquat levels in the urine.

Effects of salt spray duration on the fretting corrosion behavior of the Inconel 690 alloy tubes

PurposeThe purpose of this paper is to study the effect of surface salt spray duration on the fretting wear and electrochemical corrosion behaviors of Inconel 690 alloy.Design/methodology/approachA high-temperature steam generator was applied to salt spray test samples, a fretting wear rig was used to realize the damage behavior tests, an electrochemical workstation was applied to analysis the changes of each sample’s corrosion dynamic response before and after fretting wear.FindingsThe thickness of the oxide film that formed on sample surface was increased with the salt spray duration, and somewhat it could act as lubrication during the fretting wear process; however, the corrosive chloride would accelerate the fretting mechanical damage behavior.Originality/valueIn a salt steam spray condition, the fretting tribo-corrosion behaviors of Inconel 690 alloy surface was studied.

Aerosol Plumes of Inhalers Used in COPD.

The selection of inhaler device is of critical importance in chronic obstructive pulmonary disease (COPD) as the interaction between a patient's inhalation profile and the aerosol characteristics of an inhaler can affect drug delivery and lung deposition. This study assessed the in vitro aerosol characteristics of inhaler devices approved for the treatment of COPD, including a soft mist inhaler (SMI), pressurized metered-dose inhalers (pMDIs), and dry powder inhalers (DPIs). High-speed video recording was used to visualize and measure aerosol velocity and spray duration for nine different inhalers (one SMI, three pMDIs, and five DPIs), each containing dual or triple fixed-dose combinations of long-acting muscarinic receptor antagonists and long-acting β2-agonists, with or without an inhaled corticosteroid. Measurements were taken in triplicate at experimental flow rates of 30, 60, and 90 l/min. Optimal flow rates were defined based on pharmacopoeial testing requirements: 30 l/min for pMDIs and SMIs, and the rate achieving a 4-kPa pressure drop against internal inhaler resistance for DPIs. Comparison of aerosol plumes was based on the experimental flow rates closest to the optimal flow rates. The Respimat SMI had the slowest plume velocity (0.99 m/s) and longest spray duration (1447 ms) compared with pMDIs (velocity: 3.65-5.09 m/s; duration: 227-270 ms) and DPIs (velocity: 1.43-4.60 m/s; duration: 60-757 ms). With increasing flow rates, SMI aerosol duration was unaffected, but velocity increased (maximum 2.63 m/s), pMDI aerosol velocity and duration were unaffected, and DPI aerosol velocity tended to increase, with a more variable impact on duration. Aerosol characteristics (velocity and duration of aerosol plume) vary by inhaler type. Plume velocity was lower and spray duration longer for the SMI compared with pMDIs and DPIs. Increasing experimental flow rate was associated with faster plume velocity for DPIs and the SMI, with no or variable impact on plume duration, whereas pMDI aerosol velocity and duration were unaffected by increasing flow rate.

Experimental study on 18650 lithium-ion battery-pack cooling system composed of heat pipe and reciprocating air flow with water mist

Lithium-ion batteries (LIBs) are critical power sources for portable devices, electric vehicles, power grids, and energy-storage systems. Effective thermal management is mandatory for achieving optimal battery performance. Although the air-cooling method has been investigated extensively owing to its simple structure, convenient maintenance, and low cost, it is insufficient for cooling large-scale battery packs because of its limited air-cooling capacity and unsatisfactory temperature uniformity. Thus, a reciprocating spray cooling system comprising a reciprocating air flow channel, heat pipe array, and spray nozzle is proposed herein for the efficient cooling of 18,650 LIB packs. The effects of the inlet air speed, spray frequency, and spray duty cycle on the cooling performance of the reciprocating mist cooling system and the corresponding optimal operating parameter range are analyzed. Additionally, the competitive mechanism between forced air convection and evaporative cooling is discussed. The results indicate that, compared with the case of natural convection cooling, the temperature increment of the battery pack decreases by 32.1 % under reciprocating mist cooling. Meanwhile, the maximum temperature difference reduces to approximately 3.41 °C with 3C of discharge. The spray frequency minimally affects the overall heat dissipation but induces surface temperature fluctuations in individual batteries. Increasing the spray duration per 10 s in a single spray duty cycle can reduce the average temperature of the battery pack by approximately 2 °C. Additionally, the power-allocation scheme affects the heat dissipation of the system. Decreasing the flow rate of spray cooling water and increasing the inlet air speed promote the evaporation of water mist inside the system, thus further improving heat dissipation. This study provides new insights into the design of air-cooled thermal management systems for battery packs.

Literature Review: Impact of Organophosphate Pesticide Exposure on Cholinesterase Enzyme Activity and Associated Risk Factors for Poisoning, 2017-2020

Introduction: Organophosphate pesticides, which are used to control pests of crops, affect the nervous system by inhibiting the activity of cholinesterase enzymes in the body. This can be achieved by inhaling, eating, or applying it to the skin. This study research aims to determine the level of pesticide exposure that can inhibit the activity of the Cholinesterase enzyme in the blood. This study employed a systematic literature review with library sources used through Google Scholar and Science Direct, resulting in 16 research articles discussing cholinesterase enzyme activity due to exposure to organophosphates discussed in 2017-2020. Discussion: The results of a previous study found that exposure to organophosphates significantly reduced cholinesterase enzyme activity by 50-80%. Testing for cholinesterase as a biomarker of exposure to Organophospate (OP) through acetylcholinesterase activity in red blood cells (AChE). This study explored the relationship between gender, age, knowledge of farmers, personal protective equipment, farmers’ smoking behavior, and duration of spraying. Conclusion: Poisoning alters the activity of cholinesterase enzymes in the blood of farmers, resulting in acute and chronic health problems. Several factors have been found to correlate with organophosphate poisoning, including age, level of knowledge among farmers, use of personal protective equipment, smoking behavior, and duration of spraying activities.

Thermo-optical performance of building glass under salt sedimentation

The phenomenon of salt sedimentation on the building glass surface occurs in coastal salt-fog climates, leading to the changes in surface heat transfer characteristics and optical properties, which affects the indoor environment and gradually reduces building energy performance. Regrettably, there remains a paucity of research concerning the impact of salt sedimentation on the thermal and optical performances of building glass. This study investigated the salt sedimentation features of building glass using an indoor accelerated test, and explored the relationships between surface heat transfer coefficients, optical properties and salt sedimentation. As the spray duration grew, the sedimented salt stains appeared more dispersed and less dense, but their dimensions increased, exhibiting an exponential growth tendency. The salt sedimentation per unit area grew logarithmically with the spray duration, with the magnitudes being 14.4 to 40.0 mg/m2 and 15.6 to 44.3 mg/m2 under 5% and 10% brine concentration conditions, respectively. The convection heat transfer coefficient (CHTC) and radiative heat transfer coefficient (RHTC) showed a linear monotonic increase with the salt sedimentation, in contrast to the control condition, with the maximum growth rates reaching 178.7% and 97.2%, respectively. The extended CHTC model could be used to calculate the CHTC regarding the impact of salt sedimentation and wind speed. The entire solar spectral transmittance and reflectance was affected by salt sedimentation, and the visible light transmittance, reflectance, hemispherical emissivity, and shading coefficient of low-E and clear glasses all decreased linearly with the increase of salt sedimentation.

Risk Factors for Pesticide Poisoning in Horticultural Farmers in the Agricultural Area of West Seram Regency, Indonesia

Background: In the field of environmental health, pesticide poisoning is still an important health problem in agricultural areas, especially horticultural agriculture, as a result of the risky habit of using pesticides. This study aimed to analyse the risk factors for poisoning in horticultural farmers in West Seram District, Indonesia. Methodology: This study applied a cross-sectional design, involving 298 farmers selected by proportional random sampling technique. The risk factors studied included tenure, the use of personal protective equipment, duration of spraying, frequency of spraying, number of types of pesticides, method of mixing, direction of spraying, and dose of pesticides, smoking while spraying, washing hands when eating, drinking while spraying, spraying time and personal hygiene. Data were collected through interviews, then analyzed using multiple logistic regression test. Results: The results showed that the p-value for each factor was use of personal protective equipment = 0.025, frequency of spraying = 0.023, method of mixing pesticides = 0.004, direction of spraying = 0.017 and personal hygiene = 0.002. Conclusions: It could be concluded that the use of personal protective equipment, personal hygiene, frequency of spraying, method of mixing and spraying direction are risk factors for pesticide poisoning in horticultural farmers.

Refrigerant spray cooling in the overheating decomposition stage of ternary Li-ion battery

In recent years, the thermal safety control of lithium-ion batteries has gradually received considerable critical attention. In this context, this research proposes a refrigerant emergency spray cooling method for lithium-ion ternary battery overheating stage to prevent thermal runaway. A coupled calculation model for the overheating behavior and emergency spray cooling of lithium-ion batteries is established in this paper. Furthermore, the starting point and range of decomposition reaction stage of NCM111 ternary lithium battery are defined by numerical simulation. A research is conducted on the cooling effect of spray in four battery overheating stages, respectively. The results of the study show that during the stage of SEI decomposition stage, the battery overheating decomposition reaction can be prevented by applying a minimum spray pressure of 0.8 MPa. Meanwhile, in the negative-solvent reaction stage, a maximum spray pressure of 2.4 MPa and the increase of the spray duration to 5.4 s can interrupt the overheating decomposition reaction. When it comes to the positive-solvent reaction stage, increasing the number of spray nozzles from double to four can successfully prevent the reaction from continuing. In the electrolyte decomposition reaction stage, refrigerant spray cooling cannot halt the reaction, but it can slow down the temperature rise rate of the battery and the time of thermal runaway, so that the battery reaches 160 ℃, 200 ℃, 240 ℃ time delayed by 10.4 s, 14.3 s and 18.7 s, respectively.

Factors Associated with Pesticide Exposure and Relationship with the Incidence of Anemia

The use of pesticides by farmers from year to year has increased. Excessive use can harm human health because it is toxic and less persistent in nature. every year as many as one million people will experience health problems due to pesticides and the prevalence continues to increase. There are many impacts resulting from exposure to pesticides including anemia which is a form of chronic effects from the use of pesticides (WHO, 2017). This systematic review aims to analyze and examine various literature that discusses anemia that occurs in farmers due to pesticides. The research method used is literature review with secondary data obtained from the Google Scholar database, PubMed with a span of 10 years. In order to obtain 8 scientific articles that can be analyzed. The results of a literature review of 8 research articles show that most farmers control pests on plants using pesticides. Factors that influence the incidence of anemia are not using PPE, duration of spraying, years of service, nutritional status, level of education, gender, exposure to pesticides. Human health is also an impact that is affected by excessive and continuous use and exposure to pesticides, especially for the farmers themselves. The body exposed to pesticides causes abnormalities in the blood profile because the pesticides themselves interfere with the organs that form blood cells and the body's immune system.

Implementation of Fuzzy Logic for Chili Irrigation Integrated with Internet of Things

Chili, mustard greens, and tomatoes have always been farmers' favored crops, despite their high water and labor demands. Adapt to these conditions by utilizing smart agriculture systems (SAS) agricultural techniques that involve technology such as automatic irrigation that regulates watering based solely on routine, regardless of land conditions. This type of control during the transitional season can lead to root rot and fungisarium disease on chile plants. In the form of an embedded system with internet of things (IoT) monitoring, a system incorporating artificial intelligence such as fuzzy logic is proposed as a solution. Fuzzy logic will regulate irrigation based on the land's humidity and temperature using computational mathematics. Beginning with the fuzzyification stage to map the sensor's temperature and humidity input values, fuzzy logic is applied. The creation of an inference engine in the NodeMcu 8266 microcontroller to interpret fuzzy rule statements in the form of aggregation of minimum conditions with the AND operator, followed by the combination of a single set value of 0 and 1 in the fuzzy system to produce an appropriate actuator response After the entire system has been prototyped, testing is conducted to determine the responsiveness of the fuzzy program code to changes in the simulated agricultural cultivation land ecosystem. This study found that the fuzzy logic program code embedded in the nodeMCU8266 microcontroller effectively controls the spraying duration of the pump in response to various simulated environmental conditions within 3.6 seconds.

The Levels of Cholinesterase Enzyme and Hemoglobin in Linggasari Village’s Farmers

Farmers in Linggasari Village often mix pesticides, did not use pesticides that follow the dose, did not use PPE completely, eat, drink or smoke did not clean themselves after spraying. Some types of pesticides can reduce cholinesterase enzyme and hemoglobin levels. The study aimed to analyze the factors that correlated with cholinesterase enzyme and hemoglobin levels of spraying farmers. This was a cross-sectional study conducted from March to April 2022. The population of this study was all farmers who use pesticides, as many as 30 farmers qualify the inclusion criteria, namely male spraying farmers aged over 18 years, the maximum last contact time with pesticides was two months before the study was conducted. The independent variables were age, BMI, working period, frequency of spraying, duration of spraying, and PPE usage score. The dependent variables included cholinesterase and hemoglobin levels. Bivariate analysis was assessed with Pearson Correlation Test or Spearman Correlation Test, while multivariate analysis used linear regression. The results showed that age (p=0,032, r=0,391) and BMI (p=0,036, r= 0,385) correlated with cholinesterase enzyme, and age (p=0,000, r=0,615) correlated with farmers' hemoglobin levels. The results of multivariate analysis that the most influential factor on cholinesterase enzyme and hemoglobin levels was age.

On-Demand Portable Paper-Based Electrospray Ionization Mass Spectrometry for High-Sensitivity Analysis of Complex Samples.

Paper spray ionization has been demonstrated to be the most promising substrate-based source, but this technique suffers from the low desorption efficiency of target compounds and poor portability. In the current study, we describe a portable paper-based electrospray ionization (PPESI) in which a piece of triangle paper and adsorbent are packed sequentially into a modified disposable micropipette tip. This source not only captures the feature of paper spray and adsorbent for highly efficient suppression of sample matrixes for target compound analysis but also takes advantage of a micropipette tip to prevent spray solvent from rapid evaporation. The performance of developed PPESI depends on the type and amount of packed adsorbent, paper substrate, and spray solvent and applied voltage. Moreover, by contrast to other related sources, the analytical sensitivity and the spray duration of PPESI in tandem with MS have been improved by factors of 2.8-32.3 and 2.0-13.3, respectively. Based on its high accuracy (>96%) and precision (less than 3% relative standard deviation), the PPESI coupled to a mass spectrometer has been used to determine diverse therapeutic drugs and pesticides in complex biological (e.g., whole blood, serum, and urine) and food (e.g., milk and orange juice) matrixes, and the limits of detection and quantification were 2-4 pg mL-1 and 7-13 pg mL-1, respectively. Taking the portability, high sensitivity, and repeatability, the technique may be a promising alternative for complex sample analysis.

Evaluation of spraying technique for heat-reflective coating on asphalt pavements

ABSTRACT Heat-reflective coating (HRC) for pavement can effectively mitigate urban heat island (UHI) and reduce pavement distresses, whose cooling effect, service performance and prospective applications have been widely reported, but construction technology investigation is still unavailable. Following this situation, the spraying technology was evaluated with a typical epoxy resin-based HRC, the Dual-Arrhenius viscosity model for coating curing was established, and the factors affecting the curing time were examined by applying typical correlation analysis. Besides, adhesion and abrasion tests were taken to discuss the effect of spraying conditions on mechanical properties. Results show that the available spraying duration of HRC is exponentially negatively correlated with temperature and duration is insufficient for spraying above 323 K. Raising the diluent content could delay the optimal spraying time with a litter effect on the available spraying duration. Pavement temperature is the main factor affecting the curing time and a 20 K increase could decrease the curing time by up to 34%. Repeated spraying after setting the former layer is the best spraying method for HRC, which can effectively improve adhesion and anti-abrasion.