Modeling of cutter–loader control in high production longwalls

2019 ◽  
Vol 4 ◽  
pp. 30-40
Author(s):  
K.N. Kopylov ◽  
◽  
S.S. Kubrin ◽  
I.M. Zakorshmenniy ◽  
◽  
...  
Keyword(s):  

Diabetes mellitus can be defined as chronic metabolic disease which results from either relative or complete absence of insulin by the pancreatic beta islet cells. This in-turn may lead to hyperglycemia due to disturbances in the metabolism of glucose. In the human body, iron is con- sidered to be an effective pro-oxidant and participates in the generation of reactive oxygen species (ROS) such as hydroxyl radical. Because of the poor antioxidant defense mechanism of beta cells (low production of antioxidant enzymes such as catalase, glutathione peroxidase and dismutase), so they are highly prone to iron-induced oxidative stress and iron deposition in it and this will lead to apoptosis, and subsequently insulin deficiency. This iron deposition in beta cells will also lead to insulin resistance by reducing insulin extracting ability of the liver and inhibiting glucose uptake in muscle tissues and fats, this in turn will result in high production of hepatic glucose. Ferritin which is an acute phase reactant protein, that responds to acute stress like trauma, infections, tissue necrosis and surgery, it can produce diabetes mellitus either through inflammation or by increasing iron stores.


2020 ◽  
Vol 12 (45) ◽  
pp. 63-66
Author(s):  
Halim Nagem Filho ◽  
Reinaldo Francisco Maia ◽  
Reinaldo Missaka ◽  
Nasser Hussein Fares

The osseointegration is the stable and functional union between the bone and a titanium surface. A new bone can be found on the surface of the implant about 1 week after its installation; the bone remodeling begins between 6 and 12 weeks and continues throughout life. After the implant insertion, depending on the energy of the surface, the plasma fluid immediately adheres, in close contact with the surface, promoting the adsorption of proteins and inducing the indirect interaction of the cells with the material. Macrophages are cells found in the tissues and originated from bone marrow monocytes. The M1 macrophages orchestrate the phagocytic phase in the inflammatory region and also produce inflammatory cytokines involved with the chronic inflammation and the cleaning of the wound and damaged tissues from bacteria. On the other hand, alternative-activated macrophages (M2) are activated by IL-10, the immune complex. Its main function consists on regulating negatively the inflammation through the secretion of the immunosuppressant IL-10. The M2 macrophages present involvement with the immunosuppression, besides having a low capacity for presenting antigens and high production of cytokines; these can be further divided into M2a, M2b, and M2c, based on the gene expression profile.


Alloy Digest ◽  
1983 ◽  
Vol 32 (3) ◽  

Abstract AISI 1141 is a resulfurized carbon steel containing nominally 1.50% manganese and 0.08-0.13% sulfur to give it free-machining characteristics. It has relatively low hardenability. Its ductility and toughness are fairly good in the longitudinal direction but tend to be low in the transverse direction. It is highly recommended for high-production automatic-machine products. Among its many uses are screws, bolts, ball joints, spindles and light-duty gears. This datasheet provides information on composition, physical properties, hardness, and tensile properties. It also includes information on forming, heat treating, machining, joining, and surface treatment. Filing Code: CS-93. Producer or source: Carbon steel mills.


Alloy Digest ◽  
1962 ◽  
Vol 11 (1) ◽  

Abstract FREE-CUTTING BRASS is a highly leaded copper-zinc alloy, combining free-machining characteristics with good mechanical and corrosion resistant properties, suited to high production in automatic screw machines. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and shear strength. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Cu-112. Producer or source: Brass mills.


Alloy Digest ◽  
1957 ◽  
Vol 6 (6) ◽  

Abstract AISI C1144 is a tough, carbon-manganese steel characterized by its free-machining qualities. It is especially recommended for high production automatic machine products. This datasheet provides information on composition, physical properties, hardness, and tensile properties as well as fracture toughness. It also includes information on heat treating, machining, and joining. Filing Code: CS-6. Producer or source: Bethlehem Steel Corporation.


Alloy Digest ◽  
1969 ◽  
Vol 18 (4) ◽  

Abstract Ultradie 3 is a high production tool and die steel of the high-carbon high-chromium type. It is deep hardening, non-deforming, and has high resistance to wear and compression. It is recommended for heavy duty tools and dies. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and compressive and bend strength as well as fracture toughness. It also includes information on forming, heat treating, machining, and joining. Filing Code: TS-218. Producer or source: Cyclops Corporation.


Alloy Digest ◽  
1953 ◽  
Vol 2 (9) ◽  

Abstract CIRCLE M is a molybdenum-tungsten high-speed steel containing 9.0% cobalt. It is adapted to high production applications where increased speeds and heavy cuts necessitate unusual red-hardness and wear resistance. This datasheet provides information on composition, physical properties, elasticity, and compressive strength. It also includes information on forming, heat treating, and machining. Filing Code: TS-10. Producer or source: Firth Sterling Corporation.


Alloy Digest ◽  
1961 ◽  
Vol 10 (10) ◽  

Abstract Circle-C is a high cobalt-tungsten steel having unusual red-hardness, and is particularly adapted for high production cutting tools. This datasheet provides information on composition, physical properties, and hardness. It also includes information on forming and heat treating. Filing Code: TS-110. Producer or source: Firth Sterling Corporation. See also CIRCLE C (T-5), Alloy Digest TS-502, October 1990.


Alloy Digest ◽  
2000 ◽  
Vol 49 (1) ◽  

Abstract Finkl WF-XTRA has high wear resistance while retaining moderate fracture toughness. The alloy is recommended for larger die blocks. The optimum diameter for hardenability is 838 mm (33 in.). It is appropriate for use in high-production hammers where die temperatures may be above average or in presses with moderately high operating temperatures. This datasheet provides information on composition, microstructure, hardness, and tensile properties as well as fracture toughness. It also includes information on heat treating, machining, and joining. Filing Code: TS-570. Producer or source: A. Finkl & Sons Company.


2020 ◽  
Vol 51 (4) ◽  
Author(s):  
Abdullah & Al-Taye

This study was aimed at assessing marketing efficiency in the main sites of meat production of calf fattening fields in the private sector due to the importance of meat, especially red meat, which has essential nutrient for human body growth and high commodity prices depending on the measurement indicators used to suit the nature of the research conducted in calves fattening production fields in Gogjali region- Nineveh  (2018). The basic source data of the study is obtained from sources on the ongoing ground- marketing questionnaire of three levels, the producer, the wholesaler, the retailer and two fields groups of caste random sample. The first group included (100) fields with imported calves class. The second included (51) fields with local calves class. Whereas, according to the production and marketing costs indicator, the average of marketing efficiency (ME1 ) of marketed meat in both groups of claves fattening fields amounted (92.47, 93.39%) respectively for a kilogram which is a sign of high production costs and, according to the marketing margins indicator, the average of marketing efficiency (ME2 ) of marketed meat in both groups of claves fattening fields amounted (86.89,79.13 %) for per kg which is a sign of high marketing margins. Thus the study concluded a high value of marketing efficiency using the first scale with the fattening period time for both groups while marketing efficiency by using the second scale was characterized by the gradual decline in the imported fattening fields and a gradual rise in the local fattening fields.  The study recommends supporting production inputs (fodder, treatment), unifying markets and limiting the    importation of red meat importation  in order to obtain a good production and currency policy by which the production costs could be reduced to the minimum .


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