8,659 research outputs found
GA-Fuzzy PID control simulation waveform diagram.
No full textAs is well known, the metal annealing process has the characteristics of heat concentration and rapid heating. Traditional vacuum annealing furnaces use PID control method, which has problems such as high temperature fluctuation, large overshoot, and long response time during the heating and heating process. Based on this situation, some domestic scholars have adopted fuzzy PID control algorithm in the temperature control of vacuum annealing furnaces. Due to the fact that fuzzy rules are formulated through a large amount of on-site temperature data and experience summary, there is a certain degree of subjectivity, which cannot ensure that each rule is optimal. In response to this drawback, the author combined the technical parameters of vacuum annealing furnace equipment, The fuzzy PID temperature control of the vacuum annealing furnace is optimized using genetic algorithm. Through simulation and comparative analysis, it is concluded that the design of the fuzzy PID vacuum annealing furnace temperature control system based on GA optimization is superior to fuzzy PID and traditional PID control in terms of temperature accuracy, rise time, and overshoot control. Finally, it was verified through offline experiments that the fuzzy PID temperature control system based on GA optimization meets the annealing temperature requirements of metal workpieces and can be applied to the temperature control system of vacuum annealing furnaces.</div
Optimization of the Disc Cutter Structure Parameters Based on Genetic Algorithm
No full textIn the process of shield tunneling construction, the energy consumption is a prominent issue. The disc cutter blade angle, blade tip width and corner radius are taken as design variables, and the minimum cutting special energy consumption as the target, the structural parameter optimization model of disc cutter is established. Genetic algorithm (GA) is used in the mathematical model, and the optimal solution is shown: the disc cutter blade angle is 26°, the blade tip width is 8 mm, and the corner radius is 5 mm. Compared to the actual construction data, the results are satisfactory.</jats:p
Study on Cutter Trace Calculation and Interference Checking for Complex Surfaces NC Machining
No full textCutter trace calculation and interference checking play a dominant role in the NC machining of complex surface. In this paper the conceptions of the final movement and the orientation-distance have been proposed. It is proved that the two points with minimal orientation-distance on a pair of smooth surfaces are conjugate points. Thus the conjugate problem between the two surfaces is converted into optimization process of orientation-distance function. Combining minimal orientation-distance principle with five-point optimization method, the minimal orientation-distance algorithm has been proposed to calculate the cutter trace. The cutter trace and the cutter interference are achieved respectively by local and global optimization of the orientation-distance function based on the minimal orientation-distance algorithm and GA. The validity of this new algorithm is also proved by helicoids NC machining.</jats:p
Optimal Design of Disc Cutter Structure Parameter Based on Genetic Algorithm
No full textBecause of the situation that the disc cutter bearing seriously damaged in the cutting process, disc cutter structural parameters is optimized which mainly affect the force on the bearing. The disc cutter cutting edge angle, cutting edge width, transition arc radius and caulking ring width between the bearings are taken as design variables, and the minimum equivalent load on the bearing as the target, the optimization model is established. Genetic Algorithm (GA) is used in the mathematical model.Finally, the optimized results indicate that the equivalent load on the bearing reduces 21% compared with the actual structural parameters. So the optimization results effectively reduce the force on the bearing and extend the life cycle of disc cutter.</jats:p
We will pay $1000.00 reward or arrest and delivery of W. C. Matthews, to Sheriff of Chatham County, Savannah, Ga. Charge Larceny After Trust
No full textW. 0. MATHEWS
Reward 1000.00 reward or arrest and delivery of W. C. Matthews, to Sheriff of Chatham County, Savannah, Ga. Charge Larceny After Trust.
DESCRIPTION:
Age about 30 years, but looks younger; weight about 145 pounds, height about 5 feet 9 inches, rather slender but of supple build, dark brown hair parted in the center, rather inclined to curl, slight brown mustache (doubtless shaved off now), blue eyes but rather weak looking, wears eye glasses, has clear fair-skin, rather Broad Dished Face, rather feminine appearance. Good set of teeth, upper gums show plainly when he talks.
Smokes Cigars very freely, lower lip usually chapped from excessive smoking. Nails of fingers long, always nicely manicured. A great frequenter of poolrooms, racetracks. Dresses very neat. Quite often wears silk hat, Prince Albert Coat, Low quartered shoes, fond of Jewelry, especially rings, has fine solitaire ring, also silver mounted rabbit foot attached to his cigar cutter, and handsome small size gold watch. He had in his possession some 50- and 100-Dollar bills of new issue of First National Bank of Macon, Ga. Supposed to have left Savannah, Ga., Saturday night, June 2nd for Louisville, Ky. via Knoxville, Tenn. His home was formerly in Xenia, Ohio, and New York. Resided in Atlanta, Ga., about 6 months, from there to Savannah for one month. Was in our employ, as Manager of Savannah Office.
Address MURPHY & CO., Inc., Atlanta, Ga. OR THOS. SCREVEN, Chief of Police, Savannah, Oa
御誂 五色 染
No full textDepicted are the kabuki actors Nakamura Shikan IV 四代目 中村 芝翫 as the wood cutter Ōtomo Kuronushi 大伴 黒主, who is plotting a coup d'état, and Sawamura Tanosuke III 三代目 中村 芝翫 as Sumizome 墨染, the spirit of the cherry tree.Dimensions: Vertical ōban, 20 x 16 in. (50.80 x 40.64 cm)Markings:
Artist's signature: Toyokuni ga 豊國画 (black, positive, in red toshidama cartouche)
Block cutter's seal: Koizumi Hori Kane 小泉 彫
兼 (vertical cartouche, black, positive, on yellow ground)
Publisher's seal: Bakuro yon 馬喰四, Kiya han 木屋 版 (two lines vertical text, vertical rectangular cartouche, black, positive, on white ground, Marks 26-143)
Censor's seal: Goat 9 aratame 未 九 改Gift of Drs. Thomas and Martha Carte
Increasing science, technology, engineering, and mathematics skills using Project Lead the Way
No full textIncludes bibliographical references
High-loading Ga-exchanged MFI zeolites as selective and coke-resistant catalysts for nonoxidative ethane dehydrogenation
No full textIn this paper, we investigated the effects of the Ga loading amount and H-2 treatment temperature for the reductive solid-state ion-exchange reaction on the generated Ga species in Ga-exchanged MFI zeolites (Ga-MFIs) as well as their catalysis for ethane dehydrogenation (EDH). For the formation of isolated Ga hydrides in the zeolites, [GaH](2+) ions were preferentially formed in the low-loading Ga-MFI (Ga/Al = 0.3) treated with H-2 at 550 degrees C, corresponding to the conventional preparation conditions, (Ga-MFI-0.3(550)), while the high Ga loading (Ga/Al = 1.0) and high-temperature H-2 treatment (800 degrees C) (Ga-MFI-1.0(800)) induced the formation of [GaH2](+) ions as the major Ga hydrides, as revealed by in situ Fourier transform infrared spectroscopy including the isotope experiment using D-2. In the context of other Ga species, such as Ga+ cations and partially reduced Ga oxides (GaOX), Ga+ cations and GaOX coexist in Ga-MFI-0.3(550), as indicated by pyridine adsorption experiments. On the other hand, GaOX was hardly observed and a larger amount of Ga+ cations was formed in Ga-MFI-1.0(800). The remaining Bronsted acid sites (BASs) were also characterized by the NH3 adsorption experiment. In the EDH reaction, Ga-MFI-1.0(800) exhibited high selectivity owing to low coke formation, resulting in the highest durability among the series of Ga-MFIs tested. Under the optimized conditions, Ga-MFI-1.0(800) exhibited the highest C2H4 formation rate among previously reported Pt-free catalysts. Based on the combined results of characterization, catalyst tests, and kinetic studies, the high selectivity and durability of Ga-MFI-1.0(800) can be ascribed to the low amount of the remaining BASs by isolated Ga species ([GaH](2+), [GaH2](+) ions and Ga+ cations) as well as the major formation of [GaH2](+) ions among isolated Ga hydrides
Element Distribution in Porous Ga Oxide Obtained by Anodizing Ga in Phosphoric Acid
No full textA STEM/EDS study of a porous Ga oxide film formed by an anodization process was conducted in this study to examine the crystalline structure of the film and the elemental distribution in the oxide film before and after heat treatment. The as-formed anodic film with a morphology resembling the well-known porous anodic Al oxide film was amorphous, crystallizing after heat treatment at 600 degrees C without changing the morphology and elemental distribution. The EDS elemental maps disclosed the duplex nature of the pore wall oxide; the phosphate anion was contaminated in the outer oxide layer next to the pores, and the inner layer consisted of relatively pure Ga oxide, practically free from phosphate. The similarity of morphology and elemental distributions between the porous anodic Al and Ga oxides suggests that the growth of both anodic oxide films proceeds under the same mechanism. In addition, crystallized porous Ga oxides are expected to be applied to fabricate various functional devices requiring geometrically controlled semiconductor nanohole arrays, such as devices for hydrogen formation. (c) 2023 The Electrochemical Society ("ECS"). Published on behalf of ECS by IOP Publishing Limited
Effect of thermal treatments in Ni-Fe-Ga with Co substitutions and Ni-Mn-Ga melt spun ribbons
No full textAbstractThe effect of “in situ” thermal treatments (by DSC measurements) on the martensitic transformation in two representative Ni-Fe-Ga and Ni-Mn-Ga alloys has been studied and discussed by correlating the structural and magnetic properties. The alloys were prepared from high purity elements, by arc melting under argon protective atmosphere as bulk and also as melt-spun ribbons - an alternative preparation route that also allows to assess the influences of grains size and strain induced by this processing method. All samples presented reversible thermo-elastic transformations. The thermal treatments promote a reduction of the martensitic transformation temperatures in the Ni-Fe-Ga investigated samples, as opposed to the stoichiometric Ni2MnGa where the temperatures increase with increasing the annealing temperatures. Interestingly however, the off-stoichiometric Ni-Mn-Ga with increased Ni content recovers the behaviour with reduction of transformation temperatures by thermal treatments. The precipitation of the secondary FCC (γ) phase is inherently found in Ni-Fe-Ga alloys with Ga ≤ 27% at, and also -although in lower amounts- in the off-stoichiometric Ni-Mn-Ga. The γ phase is considered to contribute to the decrease of the MT temperatures (via valence electrons concentration depletion of the main matrix) and of the transformation heat as well as to the final structural degradation if the temperature of the thermal treatments is further increased. In addition, this phase, located mainly at the grain boundaries, is responsible for the improved ductility of Ni-Fe-Ga based alloys. Changes in the transformation heat due to thermal treatments are observed and discussed in both types of alloys, the maxima of the transformation heat being associated with the highest atomic order. Thermo-magnetic measurements show that Ni-Fe-Ga alloys have close magnetic and structural transitions temperatures, with promising applications for magnetic refrigeration
- …
