Dust Resistance Research Articles

Research Progress on Effects of Freeze-Thaw Action on Wind Erosion and Dust Resistance of Microbial Cured Bare Soil

Research Progress on Effects of Freeze-Thaw Action on Wind Erosion and Dust Resistance of Microbial Cured Bare Soil

The Potential of Radish Leaves (Raphanus sativus) Extract as Shoe Polish

The research titled "The Potential of Radish Leaves (Raphanus sativus) Extract as Shoe Polish" aims to investigate the feasibility of utilizing radish leaf extract as an alternative shoe polish. Conventional shoe polishes available in the market often contain hazardous chemicals that pose potential risks to human health and the environment. This study focuses on extracting radish leaves to formulate a natural shoe polish that is both safe for users and environmentally friendly. The study evaluates the physical attributes of the radish leaf shoe polish before application, such as melting point and pH, as well as post-application aspects including odor, texture, consistency, and color. Furthermore, the research assesses the effectiveness of the shoe polish in terms of glossiness, water repellency, and dust resistance. By combining radish leaves, coconut oil, soy wax, Gumamela, and calamansi, the researchers have successfully developed a shoe care product that not only enhances the appearance of leather shoes but also prioritizes environmental well-being. The outcomes of this research have the potential to contribute to the advancement of eco-friendly shoe polishes that offer efficient performance while minimizing the reliance on harmful chemicals.

Anti-fogging/dry-dust transparent superhydrophobic surfaces based on liquid-like molecule brush modified nanofiber cluster structures

Transparent protective coatings capable of preventing fog and dust accumulation have broad application prospect in photovoltaic systems, optical devices and consumer electronics. Although a number of superhydrophobic coatings have been developed for self-cleaning purpose over the past three decades, there is still a lack of surfaces that can simultaneously possess high transparency, remarkable superhydrophobicity, and excellent fog and dust resistance. In this study, we have prepared surfaces featuring sub-wavelength nanofiber cluster structures through a facile plasma etching method, and further modified the surface with liquid-like perfluoropolyether (PFPE) brushes. The prepared PFPE modified nanofibrous surface (PFPE-NS) exhibits superior optical transparency (transmittance 90.4 % ± 0.7 %) and water repellency, with a water contact angle as high as 171.0° ± 0.6° and sliding angle down to 0.5° ± 0.1° (5 µL). More importantly, benefitted from the nanofiber cluster structures and the slippery liquid-like surface chemistry, the adhesion and accumulation of fog droplets and dust particles on PFPE-NS is greatly inhibited. As a consequence, PFPE-NS can keep excellent optical clearness after 2 h fogging test and maintain an average transmittance above 87 % after 24 h dusting test. Our study provides a promising strategy through constructing liquid-like nanofibrous coating for optical protection that could be applicable in practical rainy, foggy, and dusty environments.

Gathering Dust—Resistance to Simulator-based Deliberate Practice in Microsurgical Training

Abstract Background Despite unrestricted access to a simulated microsurgery model, learners have not consistently self-regulated their learning by completing practice. This paper explores the lived experience of learners regarding how practice is perceived and why it is resisted. Methods A qualitative study was conducted, including recorded and transcribed focus groups and semistructured interviews. First and second pass coding was conducted by one reviewer, with feedback from another. Transcripts were analyzed with a constant comparative approach customary to thematic analysis. Theory was engaged to help explain and support the findings.The study was undertaken at the University of Calgary plastic surgery residency training program in Calgary, Alberta, Canada, involving 15 informants (9 residents and 6 surgeons). Results Four themes emerged: (1) barriers to practice, (2) motivation to practice, (3) owning learning/solutioning, and (4) expectations of practice. Competing priorities and time constraints were barriers. Motivation to practice ranged from extrinsic (gaining access to the next course) to intrinsic (providing optimal patient care). Learners described a range of ownership of learning and depth of effort at solutioning of practice opportunities. Learners expressed high expectations around model fidelity, ease of setup, and feedback. Learners self-regulating their learning, with surgeons acculturating practice at work, can overcome some barriers. As per self-determination theory (SDT), learners need explicit linkage to how the task aligns with their goals. Assessment may be required to motivate learners. In respect of adult learning theory, homework needs to be allocated by a respected trainer. Modeling simulation practice may encourage adult learners. Finally, the tenets of deliberate practice (DP) need to be explained in order that learners can optimize their practice time. Conclusion Microsurgical simulation practice is valued but barriers exist that invite resolution. Assisting residents to overcome barriers, maintain motivation, take ownership, and assimilate DP will help improve their microsurgery practice.

Facile Fabrication of Transparent Hydrophobic Spectral Converting Thin Film of Cyclic Silica-Silane Structure

There is a growing demand for advanced coatings with remarkable physical properties such as high transparency, water resistance, spectrum conversion, and dust repellence, which can be used in a variety of applications. In this study, we built thin films using silicon quantum dots and a silane-based material composite, resulting in a unique mix of hydrophobicity, self-cleaning and the ability to convert ultraviolet (UV) to visible spectrum. The use of silicon quantum dots in the film results in spectrum conversion from UV to visible wavelengths, taking advantage of their broad UV absorption and concurrent visible light emission. Concurrently, a silica-silane based layer of tetraethyl orthosilicate, N, N dimethyl amino propyl trimethoxy silane, and 3-chloro-propyl trimethoxy silane is integrated, imparting not only water resistance but also dust resistance. The challenging synthesis chemistry exemplifies the several stages required to create a spectral-converting hydrophobic layer. Given its inherent transparency, coupled with UV-to-visible spectrum conversion capabilities, this novel layered structure have a potential in outer coating of solar photovoltaic systems and various outdoor glass applications.

Experimental Study on the Influence of Coal Fracture Surface Roughness on Water Injection Seepage.

Coal seam water injection has a significant effect on downhole dust resistance. However, during the operation of coal seam water injection, the seepage of the solution in the coal fractures is impacted by the roughness of coal fractures. Therefore, in this study, distilled water and a sodium lauryl sulfate surfactant were used as seepage solutions, kennel coal was used as the research subject, and four coal samples with different roughness coefficients were prepared for seepage experiments. After the analysis and discussion of the experimental results, it is found that the surface roughness of coal fractures hinders the seepage effect of coal seam water injection. The greater the surface roughness of coal fractures, the smaller the permeability coefficient. Furthermore, increasing the injection pressure and fracture aperture can reduce the influence of coal fracture surface roughness on the permeability coefficient. In addition, after sodium lauryl sulfate is added, the permeability coefficient of the coal sample is reduced. This further reveals the seepage of water injection into coal seams and provides certain guidance for the development of coal seam water injection technology.

The Flow Resistance of the Filter Bags in the Dust Collector Operating in the Line of Wood-Based Furniture Panels Edge Banding

The article describes the process of forming the wood dust filtration resistance generated during furniture production using the honeycomb board technology in a filtering installation operating in industrial conditions. The influence of the service life of the filter fabric on the filtration resistance values in industrial conditions for one installation and one type of filter fabric was analyzed. For this purpose, filter bags made of one type of filter material were used in an industrial filtering installation at four different times. The results were compared to those previously obtained at the same factory but with a different filter bag type. The analysis was based on the changes in the flow resistance of clean and dust-laden air through the filter fabric used at various times in the filtering installation of the narrow-surface treatment line in a furniture factory. This allowed for the determination of the dynamics and nature of changes in filtration resistance in industrial conditions for wood dust. The values of the dust resistance coefficient depend on the operating time and increased to the level of 20594 [s−1] for material A and from 6412.031 [s−1] to 10128.94 [s−1] for material B. The dimensional characteristics of the filtered dust and the technological conditions under which it was generated were also described.

Selection and evaluation of suitable tree species in dry and dusty mining areas of Northwest China

To select drought-resistant and dust-tolerant native species suitable for use in the rehabilitation of major coal bases in northwest China, nine tree species were identified for growth rates, biomass, harm index, and physiological indices under drought and high dust stress conditions. The results showed that, in the dust resistance index system, the order was Caragana korshinskii > Amorpha fruticosa > Sabina vulgaris > Hedysarum scoparium > Tamarix chinensis > Ammopiptanthus mongolicus > Ulmus pumila > Caryopteris mongholica > Elaeagnus angustifolia. In a comprehensive drought and dust resistance index system, 14 indices (such as shoot length, stomatal conductance, and peroxidase) had the larger weight indices. The drought and dust resistance order of the tree species was Caragana korshinskii > Ulmus pumila > Amorpha fruticosa > Sabina vulgaris > Caryopteris mongholica > Ammopiptanthus mongolicus > Hedysarum scoparium > Tamarix chinensis > Elaeagnus angustifolia. This study provides effective strategies and references for selecting suitable tree species for arid mining sites in China, and also for the revegetation of coal mining sites worldwide.

Improvement of Dust Resistance Properties on The Surface of Jute Knitted Fabrics

Jute knitted fabric was produced in knitting lab and was treated with natural and synthetic dust resistance compounds of perchloroethylene, wax, and mixers of vinegar and olive oil at different temperatures with contact of dust to develop anti-dust characteristics on jute knitted fabrics. It was found that at 80oC temperature, perchloro ethylene developed dust resistant property on jute knitted fabric whereas at 60oC, wax treatment improved a dust resistant property and in natural treatment at room temperature, spray of vinegar+olive oil improved dust resistant property as well

Evaluate Ecosystem Values of the Saihanba Based on Fuzzy Comprehensive Evaluation and Cluster Analysis

This paper aims to provide a scientific, objective, and comprehensive analysis and assessment of the value of key forest ecosystem services in the area. Firstly, important indicators for evaluating ecological impact were screened through relevant data. Then, the weights of each indicator were determined through factor analysis. A fuzzy comprehensive evaluation model was established to quantitatively analyze the impact of the restoration project of the Saihanba on the environment. The correlation between the indicators was determined by evaluating the ranking of the correlation coefficients and analyzing the impact of Saihanba on the impact of dust resistance in Beijing. The carbon emission coefficient of each province is calculated based on the carbon emission and carbon absorption data of each province in China. Cluster analysis is used to determine which provinces need to establish ecological protection areas. Finally, the number and size of protected areas are determined.

Performance of Filter Bags Used in Industrial Pulse-Jet Baghouses in Wood-Based Panels Furniture Factory

The study specifies the value of the dust resistance coefficient in the process of wood dust filtration in a pilot-scale test stand. The experiments were carried out for one type of filter material—polyester with a PP film previously used in different production lines. Filter bags from the filtering installation of the processing line for narrow surfaces of furniture panels of the honeycomb structure with a chipboard frame, HDF, natural veneer cladding, and a line of CNC drilling machines, were taken into account. Before the pilot-scale tests, the bags had been in use in industrial installations from zero to nine months. All tests were performed under identical filtration conditions. The values of the dust resistance coefficient depend on the operating time and the conditions in which filtration is carried out in an industrial plant, and increased from 6507 s−1 to 10,208 s−1 for the bags from the filter of the narrow surfaces processing line and to 29,729 s−1 for the bags from the filter of the drilling line. The most important factor influencing the properties of the filter bag in the process of wood dust filtration in an industrial filter is the cleaning pulses frequency.

Ecological sustainability of trees of protective forests against air pollution

The aim is to analyze the resistance of tree and shrub vegetation used to create protective forest belts to air pollution on the basis of experimental studies conducted by other scientists. The research was carried out on the basis of the development of experimental materials on the resistance of tree and shrub vegetation to atmospheric pollution by dust and gases, presented in the works of famous scientists. The obtained results were generalized, the probability of growing gas- and dust-resistant trees in the conditions of climate change in relation to their drought resistance was estimated and the most resistant species of trees and shrubs were recommended. Also identified species of plants that can act as bioindicators of air pollution. Studied by Prysedsky Yu.G. (2014) plant species in terms of resistance to atmospheric pollutants with sulfur, nitrogen and fluorine compounds were divided into four groups: tolerant (resistant), moderately damaged, unstable and with variable resistance. The group of resistant species includes prickly pear, common oak, Tatar honeysuckle and caragana arborescens. These species can be used to create protective forest belts. At the same time, reliable plant indicators of sulfur, nitrogen and fluoride oxides in the air will be unstable plant species — mountain ash and poplar Bolle. Classification of trees and shrubs in terms of their resistance to atmospheric smoke divides plants into three groups: stable, relatively stable, unstable, with the allocation of primary and secondary wood species for forest belts, as well as shrubs. The most resistant to atmospheric smoke are white acacia, elm, white willow, forest pear, poplar, hazel, juniper, forest apple. They can be the main components of protective forest belts in the area of atmospheric smoke. Unstable species — red oak, Scots pine, horse chestnut, viburnum — are bioindicators of atmospheric smoke. There is also a classification of tree species by dust retention M.I. Kalinin (1991). Behind it the most dust of 1 m2 of leaves is retained by white mulberry — 8.1 g, weeping willow — 8.1 g, three-pricked gladiolus — 5.1 g, elm — 4.1 g and field maple — 3.6 g. One tree absorbs the most dust during the growing season in weeping willow — 37.9 kg, Canadian poplar — 34.1 kg, white mulberry — 31.3 kg, ash — 27.1–29.6 kg, maple — 29,2 kg and high island — 24.2 kg. According to Vergeles (2000), poplars have the highest average relative dust resistance — 180 points, common ash — 170, bitter horse chestnut and linden leaf heart — 100 points each.

Experimental investigation of the anti-soiling performances of different wettability of transparent coatings: Superhydrophilic, hydrophilic, hydrophobic and superhydrophobic coatings

Natural soiling of photovoltaic (PV) panel is an increasing problem especially in arid and desert areas. Finding a strategy that can reduce dust adhesion on PV panels is highly desirable but remains challenging. In this paper, different wettability of transparent coatings including superhydrophilic, hydrophilic, hydrophobic and superhydrophobic coatings were prepared to investigate the importance of surface roughness and surface energy. Their anti-soiling effects were investigated under different airflow velocity and different tilt angles. Dust deposition density, reduced transmittance, the ratio of reduced transmittance between bare glass surfaces and coatings, and PV efficiency reduction were used to characterize dust resistance performances. It is found that dust adhesion on superhydrophilic coatings was eminently governed by their respective high surface energy, with surface roughness rendering lesser contribution towards resisting/adhering effects. However, for other three coatings, further reducing the surface energy had little influence on the improvement of dust-proof ability. A large airflow velocity is beneficial to resist dust adhesion for all four types of coatings. However, a large airflow velocity has a limited ability to improve the anti-soiling effect of superhydrophilic coating under different tilt angles compared with other three coatings. The anti-soiling coatings can be referred to hydrophilic and hydrophobic coatings, not limited to superhydrophobic coating only. The study provides an invaluable guiding significance for preparation of dust-resistant coatings.

Design of a flexible waterproof antenna for Internet of Things applications

We propose a new broadband flexible waterproof antenna suitable for Internet of Things applications. The antenna is comprised of three components: radiating elements fed by a 50-Ω coplanar waveguide transmission line and two layers from an elastomer composite (used as a substrate and top encapsulation) which completely covers the antenna's radiating elements to provide water and dust resistance. An antenna prototype is fabricated and tested. Experimental and numerical results show that the proposed antenna has broad bandwidth (|S11| ≤ −10 dB) over the frequency range of 0.83–2.52 GHz, high radiation efficiency of about 92% and good radiation patterns. The antenna was also immersed into water for 10 s, 10, 30 and 60 min, respectively and reflection coefficient magnitudes were measured, to verify its waterproof capability. The durability and flexibility tests were performed on the antenna prototype. Results show that there is no significant degradation in the antenna performance.

Development of Measurement System for Flow and Shape Using Array Ultrasonic Sensors

In Fukushima Daiichi Nuclear Power Plant (FDNPP) accident, the fuel debris formed in the Reactor Pressure Vessel (RPV) and Primary Containment Vessel (PCV) at Unit 1 - 3. To accelerate and decide further decommissioning steps of the FDNPP, it is crucial to obtain realistic information of the debris and localize contaminated water leakage from PCV. Due to high radiation and dark environment inside the PCV, investigating instruments and techniques should necessarily to meet specification of radiation resistance, waterproofness, dust resistance and so on. This study focuses on development of ultrasonic measurement system using a couple of sectorial array sensors to localize contaminated water leakage and visualize shape of object that repre- senting fuel debris, simultaneously. In this study, Total Focusing Method (TFM) and Ultrasonic Velocity Profiler (UVP) methods are considered to visualize object shape and flow pattern around it, respectively. To demonstrate applicability and reliability of developed measurement system with sectorial array sensors, a mock-up experiment result of simulated water leakage and fuel debris shape were discussed in this paper.

Improving dust resistance of mine tailings using green biopolymer

The application of biopolymers as eco-friendly stabilisers for strengthening soils has received increasing attention in recent years. This paper presents an experimental and numerical investigation of using xanthan gum, a green biopolymer, to stabilise mine tailings (MTs) for dust control. Impact tests that simulate the saltation process during wind erosion were carried out to evaluate the effect of xanthan gum on the impacting resistance of MTs, which is directly related to dust resistance. The impact test results show that the weight loss due to grain impacts is significantly reduced for biopolymer-treated MTs compared to that for untreated MTs, with more biopolymer leading to greater reduction. The improved dust resistance of MTs after biopolymer treatment may be attributed to the protective biopolymer coating formed at the surface of treated MTs, which imparts the MTs with a dense structure and enhanced cohesion and therefore improves the impacting resistance. Numerical simulation using the discrete element method was performed to explore the underlying mechanisms of how the biopolymer increases the dust resistance of MTs. The simulation results show that the bonding strength between MT particles increases linearly with biopolymer concentration; more biopolymer induces stronger interparticle bonding and therefore increases the impacting and cracking resistance of MTs.

Alternatif Bangunan Bambu Untuk Mewadahi Fungsi Industri Kuliner

Building is a complex job, where careful planning is needed first. Ranging from site analysts, function analysis, to building analysis, it must be carefully reviewed so that the building can function optimally later. Sanur is an area that develops the tourism industry, therefore supporting facilities such as food stalls / restaurants are certainly very appropriate to be developed to support the tourism industry. Establishing a seafood / seafood food stall in an uncertain area of development must of course be taken into account in order to invest in building permanently. Bambu building is the right alternative, because the cost of building is relatively cheap and can be dismantled or moved later to another place if it is not needed, and in accordance with Balinese culture. The key to the success of bambu buildings is the selection of materials. Bambu that is used is bambu that is old enough and has been through a preservation process to last long. For the culinary industry cleanliness is the main requirement. So that the selection of weeds as a roof cover is with synthetic weeds, because it has a strong and not fall / dust resistance like natural weeds.

Pilot-Scale Study on the Specific Resistance of Beech Wood Dust in a Pulse-Jet Filter

The specific beech wood dust resistance coefficient values were experimentally determined in the condition of pulse-jet filtration using a pilot-scale baghouse. The experiments were carried out for two variants of the filter medium. One of them had a PTFE (Polytetrafluoroethylene) membrane on the working surface. Three values of filtration velocity and seven levels of dust concentration at the filter inlet were used to determine the variability of the specific resistance coefficient of beech wood dust accumulated on the filter medium. The values of the specific beech wood dust resistance coefficient depend on filter medium finishing and filtration parameters: filtration velocity and dust concentration at the filter inlet. The high concentration of dust at the filter inlet and low filtration velocity should be used, especially in filters with surface finished media, for the reduction in pressure drop, which would affect in a significant reduction of energy consumption.

Experimental study on PM2.5 removal by magnetic polyimide loaded with cobalt ferrate

Abstract A novel functional magnetic polyimide loaded with cobalt ferrite nanoparticles by coprecipitation method was proposed, and XRD, FTIR, SEM technologies were employed to study their physicochemical properties. The filtration performance of non-magnetic and magnetic polyimide were examined by experimental system. The effects of dust resistance, filtration velocity and initial dust concentration on the filtration performance of magnetic polyimide were investigated under different dust loadings. The results revealed that presence of ρ-л conjugation between the cobalt ferrite and polyimide fiber resulted in easily load on the fiber surface for cobalt ferrite nanoparticles. The magnetic polyimide exhibited good filtration efficiency especially in the range of particle size less than 2 µm. The filtration efficiency of magnetic polyimide filter materials increased by nearly 20% compared with the primary polyimide. Due to the loading of cobalt ferrite, the resistance of the magnetic polyimide increased, while the resistance growth rate decreased from 100% to 29% with increased filtration velocity from 0.5 m/min to 2.5 m/min.

Forest Roles in Particle Removal during Spring Dust Storms on Transport Path.

The transpacific transport of mineral dust often occurs in spring, and a large amount of aeolian dust is deposited in the Asian continent and north Pacific. Moreover, a heterogeneous reaction occurs when dust particles are mixed with man-made pollution gases and particles. In the present study, atmospheric PM10 and PM2.5 concentrations were investigated, and a scanning electron microscope and an X-ray energy spectrometer were used to analyze the effects of dust resistance and capture by forests. It showed that (1) the PM2.5 and PM10 concentrations during a dust storm, on sunny days, and during light pollution periods, were higher in the non-forest covered area (NFC area) than in the forest covered area (FC area), except during heavy pollution events; which suggests that the forests have a strong effect on dust resistance; (2) the PM reduction efficiency of forests was highest on sunny days, followed by light pollution periods, heavy pollution periods, and during the dust storm; (3) after the dust storm, TSP captured by leaves significantly increased, especially for the broadleaved tree species; and the particulates number in the grooves on leaves’ surface increased particularly sharply. This study will help improve the dust resistance and retention efficiency of forest shelterbelt projects during dust storms.