bypass line
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2021 ◽  
Vol 10 (3) ◽  
pp. 163
Author(s):  
NI WAYAN NI WAYAN EKANTARI ◽  
NI KETUT TARI TASTRAWATI ◽  
KARTIKA SARI

A queue will occur if the average number of arrivals exceeds the capacity of service facilities. Fast food restaurants are one of the places that usually have long queues at lunchtime and dinner time. KFC in Bali, located in the village of Sanur, is a fast food restaurant that is experiencing long queues. This is because this restaurant is located in a tourism area and the only KFC outlet on the Ngurah Rai Sanur bypass line and does not yet have a drive-thru service. The current condition at KFC Sanur is that there is more than one service facility, disciplined first come first service (FCFS) queues according to the multi channel single phase queuing model. After being analyzed with data taken before the pandemic period on November 18, 2019 to December 1, 2019 for 14 days during weekdays and weekends, it was found that the performance of the KFC Sanur queue system would have a smaller utility level if there were 3 active server. The total cost per customer if there are 2 active server is IDR 78,692.38 and if there are 3 server is IDR 75,788.45. Based on the results of this analysis, it can be concluded that it will be more optimal if there are 3 active server.


Author(s):  
S. B. Aliev ◽  
◽  
Ye.U. Omarbekov ◽  
◽  

This paper analyses the experience uranium deposits mine development under conditions of highpressure nature of groundwater proposed technology "pumping wells" and upgrading technological scheme unit receiving and distribution of the solution. The results of experimental study of the use of "pumping wells" in mining deposits of uranium by in-situ leaching mine "Karatau". It is proved that by using the proposed technology and circuits under conditions of the high groundwater pressure reduces the cost of procurement of cables, significantly reduced the cost of acquisition of submersible pumps, savings in the end cap. In practice, one processing unit is equipped with one unit for receiving and distributing the solution, therefore, a leaching solution with the same acidity is supplied to all injection wells. To avoid such cases requires selective supply of different concentrations of acid with the different indicators pH. The modernization of the scheme of the unit for receiving and distributing the solution was carried out by connecting two bypass lines, where one bypass line is designed to transfer the injection wells to the pumping one, and the second one is to transfer the pumping wells to the pumping one. By connecting the two bypass lines, it will be possible to supply a leach solution with a higher acid concentration, selectively to any injection well. As a result, acid consumption will decrease due to its selective supply and pH values in wells will be balanced.


2020 ◽  
Vol 10 (22) ◽  
pp. 8311
Author(s):  
Artur Iluk ◽  
Kazimierz Malcher ◽  
Wiktor Słomski ◽  
Maciej Chorowski ◽  
Jarosław Poliński ◽  
...  

This paper presents the selected aspects of a superconducting cryogenic bypass line (BPL) design, a part of the international Facility for Antiproton and Ion Research (FAIR) SIS100 cryogenic system, currently under construction in Darmstadt, Germany. Design, manufacturing, and installation of the superconducting cryogenic bypass line is a part of a Polish in-kind contribution to the FAIR project, realized by the Wroclaw University of Science and Technology. The BPL is dedicated to transferring liquid helium and AC electric current between SIS100 arc sections and superconducting quadrupole magnets located in warm straight sections of the synchrotron. A main innovative feature of the cryogenic bypass line is transferring the electric current and liquid helium in one vacuum vessel, while in other similar projects, namely, the Large Hadron Collider at CERN (CH) or the Tevatron at FermiLab (USA), those functions are separated. The coexistence of superconducting busbars and liquid helium process pipes in one limited space, as well as numerous additional functional and technical requirements, was a source of the serious design and production challenges described in the paper, including two designs of the internal suspension system based on steel rods and aramid cables.


Author(s):  
E.А. Geraskina ◽  
◽  
О.І. Khomenko ◽  
N.V. Danichenko ◽  
А.А. Khomenko ◽  
...  

Abstract. The article is devoted to the problem of increasing the efficiency of using heating systems for industrial and municipal heat supply. The principles of rational cooling of furnaces and building materials are formulated, methods for stabilizing the thermal regime and conditions for the development of functional schemes for furnace units are determined. Rotary kilns under alternating of air temperature, wind speed, sunlight and precipitation lose from the side surface into the environment up to 30% of heat. The adverse effect of these factors negatively affects the thermal condition of the furnace unit with overheating in warm and overcooling in the cold periods of the year, and also reduces the lining stability and product quality. Characteristically, in order to maintain the necessary temperature at the inner surface of the furnace and extend the service life of the lining, the natural cooling of the side surface of the unit is assumed. This is an uncontrollable process with the above mentioned disadvantages. A radical solution to ensure the process requirements and improve utilization efficiency of fuel combustion energy is the organization of controlled cooling of the rotary kiln. One of the schemes providing the necessary heat removal from the furnace surface is a circuit with a recirculation channel. It is based on the reuse of the heating medium flow, the recirculation part of which increases with decreasing outdoor temperature. In the summer settlement mode, the system operates as a direct-flow system and the entire flow enters the consumer systems. In the winter billing period, air flows from the bypass line. Based on the above conditions, dependencies are established for finding the main parameters of the stabilizing cooling system of a rotary kiln, which is used for municipal heating.


eLife ◽  
2020 ◽  
Vol 9 ◽  
Author(s):  
Russell P Swift ◽  
Krithika Rajaram ◽  
Cyrianne Keutcha ◽  
Hans B Liu ◽  
Bobby Kwan ◽  
...  

The apicoplast of Plasmodium falciparum parasites is believed to rely on the import of three-carbon phosphate compounds for use in organelle anabolic pathways, in addition to the generation of energy and reducing power within the organelle. We generated a series of genetic deletions in an apicoplast metabolic bypass line to determine which genes involved in apicoplast carbon metabolism are required for blood-stage parasite survival and organelle maintenance. We found that pyruvate kinase II (PyrKII) is essential for organelle maintenance, but that production of pyruvate by PyrKII is not responsible for this phenomenon. Enzymatic characterization of PyrKII revealed activity against all NDPs and dNDPs tested, suggesting that it may be capable of generating a broad range of nucleotide triphosphates. Conditional mislocalization of PyrKII resulted in decreased transcript levels within the apicoplast that preceded organelle disruption, suggesting that PyrKII is required for organelle maintenance due to its role in nucleotide triphosphate generation.


Author(s):  
Capjoo Choi ◽  
Yeon-Young Chu

Abstract Severe vibration is observed at FRP (Glass-Fiber-Reinforced Thermosetting-Resin) bypass line connected to discharge of sea water intake pump which is installed on offshore platform. To find out characteristic of the flow, CFD (Computational fluid dynamics) analysis is conducted, and result shows that it is produced by complex pulsating two phase flow formed by the high speed water jet at the resistance orifice which passes through several elbows. After CFD analysis, the force-time history result from CFD analysis is used in transient structural analysis. Based on the numerical analysis result, mechanical response of the pipe and structure for the initial piping system and reinforced piping system are verified and compared with criteria of Energy Institute guideline and NORSOK S-002. Also in order to demonstrate a validity of the numerical analysis and check soundness of the whole reinforced piping and structure system with vibration, site measurement is performed. Moreover, in order to check the stress level of piping, dynamic strain measurement is undertaken. This paper discusses the details on history of bypass line design to avoid air entrapment not to damage on seawater pump, and how the vibration issue is approached, and finally compared with industry standard for safety. Further, the paper presents the numerical analysis result that makes design modifications implement for bypass piping and structure during a commissioning, and various evaluation method that verify the soundness of piping and structure based on field vibration measurement.


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