Air resistance

Part 1 book "Air conditioning and refrigeration" includes content: Air conditioning and refrigeration tools and instruments; development of refrigeration; voltage, current, and resistance; solenoids and valves; electric motors - selection, operational characteristics and problems; refrigerants - new and old; refrigeration compressors; condensers, chillers, and cooling towers; working with water cooling problems; evaporators.

320p dianmotminh01 20-05-2024 2 2   Download

The obtained results showed that the coating at the spray current of 300 A, the air pressure of 5.5 bar and the stand-off distance of 162.8 mm has the lowest porosity and highest microhardness. In addition, this coating also has better adhesion to the steel substrate and wear resistance than other coatings. Moreover, X–ray phase analysis showed that the following phases are created on the surface of the Al-Mg coatings: Al, Al2MgO4 and Al3Mg2.

7p dianmotminh02 03-05-2024 4 1   Download

This specification applies to air ventilating grille units for detention areas, assembled in part from materials conforming to Specifications A 627, A 628, and A 629; The assemblies described herein are intended to provide two types of security, designated Type A and Type B.

5p hth_hn_vn 10-12-2023 9 4   Download

In ebook "Projectile science: The physics behind kicking a field goal and launching a rocket with science activities for kids" one of four titles in the Technology for Today set, kids ages 10 to 15 learn why projectiles follow the paths they do and what factors influence those paths. Readers who are fascinated with potato cannons, slingshots, and rocketry will love taking that next step and applying what they learn about the laws of physics to the science of figuring out where to aim.

198p dangsovu 20-10-2023 3 3   Download

In marine transportation, aerodynamic performance is important for the ships, especially for the small passenger fast ships. It has affected the service speed, air resistance acting on hull, power energy as well as roll, pitch, yaw and stability of the ships.

9p vicaptainmarvel 21-04-2023 7 3   Download

The thermal behaviour of bio-fillers and biofiller/polyolefin composites were studied with thermogravimetric analysis. The thermal analysis of the fillers showed rice husk has thermal resistance comparing to sawdust. In the air atmosphere, the main peak of rice husk degradation shifted to lower temperature values compared to that in nitrogen atmosphere.

5p vilexus 30-09-2022 12 2   Download

Calotropis procera is a wild species that is drought-resistant and plays a number of economic and ecological uses. The species is important in soil fertility improvement, pollution control by monitoring sulphur dioxide emissions in the air and suitable indicator of exhausted soil. This study was undertaken in drylands of South Eastern Kenyato evaluate the species‟ soil ecology and ability to bioaccumulate heavy metalsThe objectives of the research were to determine the soil chemical and physical properties for survival of C. procera and to determine the ability of C.

12p chauchaungayxua12 29-07-2021 16 1   Download

The study was carried out during 2013-14 in Meerut district of Uttar Pradesh state to focus on the sugarcane growers regarding impact of knowledge on adoption level of IPM practices. The 80 contact farmers were selected as respondents. The study revealed that the maximum knowledge gap was found to be existing in previous crop residues, crop rotation, hand picking of the insect and their destruction, hot air and water treatment, light and pheromone trap, microbial control, use of natural enemies, resistant varieties, biopesticides/ bio-agents, application and dose of different pest etc.

7p chauchaungayxua6 26-06-2020 15 1   Download

The physical and proximate analysis of the fuel used during cooking was determined. The properties viz., moisture content fixed carbon, volatile matter, ash content was determined and the physical properties like bulk densities, resistance to water penetration and the shatter resistance of agro residue briquettes were determined to know the suitability of fuel for cook stove.

18p nguaconbaynhay6 24-06-2020 16 0   Download

This study aimed to determine bacteriological quality of indoor air in neonatal wards at tertiary hospitals and assess antibiotic resistance patterns of isolated bacteria. Passive air sampling was performed to appraise bacteriological indoor air quality employing the gravity settle plate method to monitor air quality in the morning and afternoon. Each procedure was performed in duplicate on Nutrient Agar plates for 30 and 60 minutes. A total of 75 bacteria were isolated and subjected to antibiotic sensitivity tests using the Kirby-Bauer’s disk diffusion method.

9p nguaconbaynhay6 23-06-2020 8 0   Download

ntroduction of new agricultural technology created growing realization of soil physical properties limiting crop production. However, soil physical changes and their impact on crop production are less easily realized because of their exceedingly complex and dynamic nature. Since the nature and arrangement of aggregates in soils could be expected to have a profound influence on pore space, which in turn would govern air and water relations, wide use has been made of aggregate analyses to evaluate spot physical conditions.

11p angicungduoc5 14-06-2020 16 0   Download

The present study deals with the development of nonwoven material using needle punching technique from Ficus glomerata fibres. The fibres used for development of nonwoven material were obtained from retting of Ficus glomerata stems and then scoured by using sodium hydroxide. The prepared nonwoven was tested for its physical properties such as fabric thickness, fabric weight, tensile strength, tearing strength, elongation, abrasion resistance and air permeability.

6p nguathienthan4 21-04-2020 10 0   Download

Immobilization is a wide spread technique in the last three decades. It is a powerful method which can improve properties of enzymes like stability, activity, resistance to inhibition due to the by-products in fermentation and its quick recovery. In the present investigation a halophilic organism Bacillus mycoides producing α-amylase was isolated from saline water. A mixed fermenter system was made for citric acid production using starch.

11p trinhthamhodang1212 06-04-2020 11 1   Download

Pea powdery mildew is an air-borne disease of worldwide distribution. It is particularly damaging in late sowings or in late maturing varieties. It is caused by Erysiphe pisi. In order to bring residue free peas, there is need to manage these diseases through ecofriendly measures such as by using the chitosan which is antifungal as well as induces resistance in plants. GI chitosan is a deacetylated derivative of chitin obtained by gamma irradiation of chitosan.

7p nguaconbaynhay4 22-03-2020 14 2   Download

Microbial contamination of operation theatres is the major cause of morbidity and mortality in post operative cases. The present study is to evaluate the microbial contamination of operation theatre and their antibiotic resistance pattern. This study was carried out from July 2018 to December 2018. Surface and article swabs were collected by using sterile cotton swabs moistened with nutrient broth and air samples were taken by settle plate method.

6p caygaocaolon2 11-03-2020 12 1   Download

Managing agricultural production systems on a sustainable basis is one of the most critical challenges for the future of humanity as the world population is increasing exceptionally. Concepts of modern technologies in agricultural systems have given an important role for the improvement of agricultural productions e.g. crop yield, livestock production, aquaculture production, and sustainable agriculture, in order to maintain food security.

16p quenchua2 15-12-2019 21 2   Download

Laminated Si/SiC ceramics were synthesized from porous preforms of biogenous carbon impregnated with Si slurry at a temperature of 1500 C for 2 h. Due to the capillarity infiltration with Si, both intrinsic micro- and macrostructure in the carbon preform were retained within the final ceramics. The SEM micrographs indicate that the final material exhibits a distinguished laminar structure with successive Si/SiC layers. The produced composites show weight gain of 5% after heat treatment in air at 1300 C for 50 h.

8p kethamoi1 17-11-2019 12 0   Download

Fused deposition modelling (FDM) is gaining distinct advantage in manufacturing industries because of its ability to manufacture parts with complex shapes without any tooling requirement and human interface. The properties of FDM built parts exhibit high dependence on process parameters and can be improved by setting parameters at suitable levels. Anisotropic and brittle nature of build part makes it important to study the effect of process parameters to the resistance to compressive loading for enhancing service life of functional parts.

10p kethamoi1 17-11-2019 39 3   Download

Polymer modified mortars using either recycled waste concrete fine aggregate (WCFA) or artificial marble waste fine aggregate (AMWFA) were prepared and investigated for the purpose of feasibility of recycling. The replacement ratio of recycled materials also changed to investigate the effect of it on mechanical and physical properties. The water–cement ratio was increased as the replacement ratio of either AMWFA or WCFA in mortar in the absence of styrene-butadiene rubber (SBR) latex. The presence of SBR for both WCFA and AMWFA gave the increase of the air content.

7p christian2605 11-10-2019 22 0   Download

Various polymer-modified mortars using recycled artificial marble waste fine aggregate (AMWFA) were prepared and investigated for the purpose of feasibility of recycling. Styrene–butadiene rubber (SBR) latex and polyacrylic ester (PAE) emulsion were employed as polymer modifier, and compared each other. The replacement ratio of AMWFA was also changed to investigate the effect of it on physical properties. Adding polymer cement modifier into mortar reduced water–cement ratio, and PAE was the more effective polymer cement modifier to reduce water–cement ratio than SBR.

7p christian2605 11-10-2019 13 0   Download