scholarly journals Electrospinning of Nanofibrous Membrane and Its Applications in Air Filtration: A Review

Nanomaterials ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1501
Author(s):  
Chenxin Lyu ◽  
Peng Zhao ◽  
Jun Xie ◽  
Shuyuan Dong ◽  
Jiawei Liu ◽  
...  
Keyword(s):  
Particulate Matter ◽  
Production Efficiency ◽  
Low Cost ◽  
Health And Safety ◽  
Nanofibrous Membrane ◽  
Air Filtration ◽  
High Production Efficiency ◽  
Electrospun Membranes ◽  
High Production ◽  
Controllable Process

Air pollution caused by particulate matter and toxic gases is violating individual’s health and safety. Nanofibrous membrane, being a reliable filter medium for particulate matter, has been extensively studied and applied in the field of air purification. Among the different fabrication approaches of nanofibrous membrane, electrospinning is considered as the most favorable and effective due to its advantages of controllable process, high production efficiency, and low cost. The electrospun membranes, made of different materials and unique structures, exhibit good PM2.5 filtration performance and multi-functions, and are used as masks and filters against PM2.5. This review presents a brief overview of electrospinning techniques, different structures of electrospun nanofibrous membranes, unique characteristics and functions of the fabricated membranes, and summarization of the outdoor and indoor applications in PM filtration.

scholarly journals Design and Implementation of Welding Robot Based on PLC

2019 ◽  
Vol 25 ◽  
pp. 02006
Author(s):  
Litao Wang
Keyword(s):  
Industrial Production ◽  
Production Efficiency ◽  
Low Cost ◽  
New Technology ◽  
Welding Quality ◽  
Welding Robot ◽  
Production Scale ◽  
High Production Efficiency ◽  
High Production ◽  
Improve Production Efficiency

With the development of the revolutionary tide of new technology, our production scale is gradually expanding. Manual production has been unable to meet the requirements of industrial production. In order to improve production efficiency and welding quality, we developed a welding robot. Because it has the characteristics of high production efficiency, stable welding quality and large practical demand. It is developing most rapidly. With the development of PLC technology, we gradually apply it to the development of welding robot. Its advantages of good ductility, low cost and convenient maintenance can bring great value to industrial production.

scholarly journals Development of a form rolling micro surface texturing system for friction reduction application in the shaft component

2016 ◽  
Vol 231 (22) ◽  
pp. 4263-4273 ◽  
Author(s):  
X Song ◽  
JZ Huang ◽  
Sam Oh ◽  
Atsushi Danno ◽  
Sylvie Castagne
Keyword(s):  
Surface Texture ◽  
Production Efficiency ◽  
Rotation Speed ◽  
Low Cost ◽  
Surface Texturing ◽  
Friction Reduction ◽  
Surface Finishing ◽  
High Production Efficiency ◽  
Reduction Efficiency ◽  
High Production

Surface texture is one of the most promising methods to achieve friction reduction in the mechanical components, and it has been rapidly developed in the last decade. The friction reduction mechanism of regularly patterned surface texture is widely considered to be lubricant retention and debris entrapment. There are many ways to manufacture micro surface texture, among which deformed-based micro-surface texturing is the least studied. However, it has many unique advantages that cannot be surpassed by the rest, such as high production efficiency, fine geometrical fidelity and smooth surface finishing. Therefore, this study aims at developing a deformation-based low-cost micro form-rolling machine to create micro surface texture on the cylindrical component. A new demonstrator for examining the friction reduction efficiency of the micro surface texture has also been built and tested. Results show that the shaft with micro surface texture is able to reach a maximum of 48.1% friction reduction at rotation speed 400 r/min with lubricant SAE30 compared to the non-textured workpiece with the same condition.

scholarly journals Particle Acceleration in High-Energy Gamma-Ray Sources

1994 ◽  
Vol 142 ◽  
pp. 877-881
Author(s):  
David Eichler
Keyword(s):  
Gamma Rays ◽  
Production Efficiency ◽  
Gamma Ray ◽  
High Energy ◽  
Thick Target ◽  
Shock Acceleration ◽  
High Production Efficiency ◽  
Energy Gamma ◽  
High Production ◽  
High Energy Particles

AbstractMany proficient gamma-ray sources show energy spectra that are consistent with E−2 primary spectra. Such sources include recently identified gamma-ray quasars and some gamma-ray bursts. Assuming thick target conversion, this is consistent with shock acceleration, and the dominance of the gamma rays of the luminosity is also consistent with previous predictions of high production efficiency of fresh cosmic rays in shocks. The spectral cutoffs in the gamma rays may offer clues as to whether the high-energy particles are electrons or protons. Resolution of this matter might have implications for the nature of the sources and for theory of shock accelerated electrons.Subject headings: acceleration of particles — gamma rays: bursts — shock waves

Synthesis of phenol formaldehyde (PF) resin for fast manufacturing laminated veneer lumber (LVL)

Holzforschung ◽  
2018 ◽  
Vol 72 (9) ◽  
pp. 745-752 ◽  
Author(s):  
Shu Hong ◽  
Zhongji Gu ◽  
Ling Chen ◽  
Ping Zhu ◽  
Hailan Lian
Keyword(s):  
Bonding Strength ◽  
Production Efficiency ◽  
Phenol Formaldehyde ◽  
Alkaline Condition ◽  
Cross Linking ◽  
Cold Pressing ◽  
Laminated Veneer Lumber ◽  
High Production Efficiency ◽  
High Production ◽  
Winter Time

AbstractPhenol formaldehyde (PF) resin is a well-tried adhesive for manufacturing laminated veneer lumber (LVL). PF has a high bonding strength, good cold pressing property and contributes a lot to the high production efficiency of LVL. In the present paper, PFs were synthesized at three different alkaline condition levels with a molar formaldehyde to phenol (F/P) ratio of 2.25. The bonding strength of PFs was not influenced by the alkalinity. Compared with PFs synthesized under alkalinity of 1 and 4%, PF with 8% alkalinity formed a resin with a high mole mass (MM), uniform mole mass distribution (MMD) and a high cross-linking density. With PF8%, the cold pressing property could be shortened from 30 to 12 min in the winter time. Cured PF8%had a higher cross-linking density than PF1%and PF4%. PF8%has a high potential for industrial production of LVL.

scholarly journals Design and Fabrication of Wafer-Level Microlens Array with Moth-Eye Antireflective Nanostructures

Nanomaterials ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 747 ◽  
Author(s):  
Shuping Xie ◽  
Xinjun Wan ◽  
Bo Yang ◽  
Wei Zhang ◽  
Xiaoxiao Wei ◽  
...  
Keyword(s):  
Nanoimprint Lithography ◽  
Production Efficiency ◽  
Low Cost ◽  
Microlens Array ◽  
Wafer Level ◽  
Lens Array ◽  
Wafer Level Packaging ◽  
High Production ◽  
Aspherical Lenses ◽  
Profile Accuracy

Wafer-level packaging (WLP) based camera module production has attracted widespread industrial interest because it offers high production efficiency and compact modules. However, suppressing the surface Fresnel reflection losses is challenging for wafer-level microlens arrays. Traditional dielectric antireflection (AR) coatings can cause wafer warpage and coating fractures during wafer lens coating and reflow. In this paper, we present the fabrication of a multiscale functional structure-based wafer-level lens array incorporating moth-eye nanostructures for AR effects, hundred-micrometer-level aspherical lenses for camera imaging, and a wafer-level substrate for wafer assembly. The proposed fabrication process includes manufacturing a wafer lens array metal mold using ultraprecise machining, chemically generating a nanopore array layer, and replicating the multiscale wafer lens array using ultraviolet nanoimprint lithography. A 50-mm-diameter wafer lens array is fabricated containing 437 accurate aspherical microlenses with diameters of 1.0 mm; each lens surface possesses nanostructures with an average period of ~120 nm. The microlens quality is sufficient for imaging in terms of profile accuracy and roughness. Compared to lenses without AR nanostructures, the transmittance of the fabricated multiscale lens is increased by ~3% under wavelengths of 400–750 nm. This research provides a foundation for the high-throughput and low-cost industrial application of wafer-level arrays with AR nanostructures.

scholarly journals 313 PERFORMANCE OF `STARKSPUR SUPREME' ON 15 APPLE ROOTSTOCKS OVER 10 YEARS AT 28 LOCATIONS IN THE NC-140 TRIAL

HortScience ◽  
1994 ◽  
Vol 29 (5) ◽  
pp. 475c-475
Author(s):  
D.C. Ferree
Keyword(s):  
Production Efficiency ◽  
Apple Seedling ◽  
Apple Rootstocks ◽  
North Central ◽  
The North ◽  
High Production Efficiency ◽  
North Central Regional ◽  
P 16 ◽  
High Production ◽  
Cooperative Project

In 1984 trees of `Starkspur Supreme Delicious' apple on 15 rootstocks were planted at 28 locations in North America according to guidelines established by The North Central Regional Cooperative Project (NC-140). The largest trees were on P.18, ANT.313, B.490 and seedling. Producing trees approximately 70% the size of seedling were rootstocks P.1 and M.7 EMLA while M.26 EMLA and C.6 were 50% the size of seedling. A group of rootstocks 30% the size of seedling or smaller were B.9, MAC.39, P.22, P.2, P.16. Rootstocks with high production efficiency were P.16, 8.9, P.22, P.2 and C.6. Rootstocks with low production efficiency similar to apple seedling were MAC.1, M.4., B.490, P.18 and ANT.313.

scholarly journals Wykorzystanie czynników produkcji w gospodarstwach specjalizujących się w chowie bydła rzeźnego w wybranych krajach Unii Europejskiej

2018 ◽  
Vol 18(33) (2) ◽  
pp. 280-290 ◽  
Author(s):  
Aldona Skarżyńska
Keyword(s):  
Great Britain ◽  
Economic Efficiency ◽  
Production Efficiency ◽  
Average Data ◽  
Production Factors ◽  
High Production Efficiency ◽  
Beef Producers ◽  
High Production ◽  
Value Production ◽  
The Eu

The aim of the study was to assess the use of production factors in farms specializing in production of cattle for fattening in six countries, which are the biggest producers of beef in the EU-15 (in France, Germany, Italy, Great Britain, Spain and Ireland) and in two countries included in the EU N13 (in Poland and Romania). The research used FADN EU average data in 2010-2015. The productivity and profitability of production factors, the economic efficiency of production and the dependence of farms on subsidies were examined. The results indicate an advantage of beef producers in Italy, Spain, Romania and Poland. In farms in France, Germany, Great Britain and Ireland, the costs were higher than the value production, as a result the income was a negative value. The loss was covered by subsidies, which also influenced the amount of income, but its level did not result from high production efficiency.

Low metabolic rate in scorpions: implications for population biomass and cannibalism

2001 ◽  
Vol 204 (3) ◽  
pp. 607-613 ◽  
Author(s):  
J. Lighton ◽  
P. Brownell ◽  
B. Joos ◽  
R. Turner
Keyword(s):  
Metabolic Rate ◽  
Production Efficiency ◽  
Arid Areas ◽  
High Biomass ◽  
Terrestrial Arthropods ◽  
Parsimonious Explanation ◽  
High Production Efficiency ◽  
High Production ◽  
Metabolic Expenditure

Scorpions are abundant in arid areas, where their population biomass may exceed that of vertebrates. Since scorpions are predators of small arthropods and feed infrequently across multi-year lifespans, a parsimonious explanation for their observed, anomalously high biomass may be a depressed metabolic rate (MR). We tested the hypothesis that scorpion MR is significantly depressed compared with that of other arthropods, and we also measured the temperature-dependence of the MR of scorpions to quantify the interaction between large seasonal variations in desert temperatures and MR and, thus, long-term metabolic expenditure. Scorpion MR increased markedly with temperature (mean Q(10)=2.97) with considerable inter-individual variation. At 25 degrees C, the MRs of scorpions from two genera were less than 24 % of those of typical terrestrial arthropods (spiders, mites, solpugids and insects) of the same mass. It is likely, therefore, that the low MR of scorpions contributes to their high biomass in arid areas. The combination of high biomass and high production efficiency associated with low MR may also favor a density-dependent ‘transgenerational energy storage’ strategy, whereby juveniles are harvested by cannibalistic adults that may be closely related to their juvenile prey.

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