DJ Screw €? Endonesia (Chapter 070)
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Davis began buying records of his own and would spin with his friend Trey Adkins, who would rhyme. "Screw had a jam box and he hooked up two turntables to it and made a fader out of the radio tuner so he could deejay." Adkins said if Robert Earl didn't like a record, he would deface it with a screw. One day Adkins asked him, "Who do you think you are, DJ Screw?" Robert Earl liked the sound of that and, in turn, gave his long-time friend a new name: Shorty Mac.[2]
The genre shown by DJ Screw has since evolved into a Houston-based subculture that is associated with the recreational consumption of codeine, opulent jewelry and elaborate vintage vehicles. Screw has also left behind a cult following of listeners who self-identify as "screwheads". A music festival and car show in honor of DJ Screw was set up in 2006. The inaugural DJ Screwfest featured 200 vehicles and a set list featuring notable Houston hip-hop acts like Trae and Chingo Bling. The first festival took place at the Pasadena County Fairgrounds. The 2007 documentary film Screwed In Houston, produced by VBS/Vice Magazine, details the history of the Houston hip hop scene and the influence of the chopped and screwed sub-culture on Houston hip hop. The 5-part series devotes one full episode to DJ Screw and includes video footage of him days before his death. The University of Houston Libraries Houston Hip Hop Research Collection [11] includes the DJ Screw Papers [12] including approximately 1500 vinyl records owned by DJ Screw, original DJ Screw recordings, photographs, handwritten track lists, and more. Some of these materials have been digitized. In July 2019, University of Texas Press announced that Houston Rap Tapes author Lance Scott Walker was writing a book about DJ Screw to be published in spring 2022. In January 2020, the biopic All Screwed Up was revealed, detailing the life and events that DJ Screw went through. In December 2020, Sony announced that the film is in development, with Isaac Yowman directing. No date for release has been announced.[13]
Robert Earl Davis, Jr. (20 de julho de 1971 - 16 de novembro de 2000), mais conhecido pelo seu nome artÃstico DJ Screw foi um DJ e rapper estadunidense, mais conhecido por trabalhar no grupo Screwed Up Click e se envolver de forma direta na cena do hip hop de Houston.[1] Ele lançou 234 screw-tapes até a data de sua morte, em 16 de novembro de 2000, resultante da combinação letal de codeÃna com outras drogas.[2]
Various procedures have been developed to improve the accuracy of PS placement. Ingeneral, they can be grouped into the conventional freehand, modified freehand, andimage-guided (Figure 1).The conventional freehand (FH) relies solely on anatomical landmarks; thus requiringadequate knowledge and experience from the spine surgeon through a higher learning curve.7 We define modified freehand (MF) when the surgeon utilizes non-imagingtechnology such as 3-dimensional (3D) printed anatomic models,8 3D printed drill template,9 electronic conductivity,10 full-power assisted (FPA),11 or electromyography (EMG)12 to assist PS placement. Whereas, image-guided techniques utilize eitherfluoroscopy-based navigation (FL), intraoperative computed tomography/CT-basednavigation (CT-nav), robotic-assisted (RA),13 or ultrasound (UG)14 to help the surgeon visualize the screw position.
The subgroup analysis showed better accuracy in MF (with ECD) compared to FH(OR 3.81 (95% CI, 2.09-6.97), P < .0001). Varyingresults exist in the literature regarding ECD application. Chaput et al.compared 78 PS inserted with ECD assistance in 18 patients aged 55 ± 12years. They found no difference in terms of accuracy; however, it ischallenging to investigate the source of this distinct result as they didnot elaborate the characteristics of the patients included in the surgery.44 Greater benefit from this technology might be obtained in morecomplicated cases. A retrospective comparative study of 248 children withsevere spinal deformities showed that in the ECD group there were lessmisplaced screws compared to the group without the aid of ECD (3.06% and6.6% breach rates respectively, P = .048).45
Hall D, the new Jefferson Lab experimental facility built for the 12GeV upgrade, features a LASS 1.85 m bore solenoid magnet supported by a 4.5 K helium refrigerator system. This system consists of a CTI 2800 4.5 K refrigerator cold box, three 150 hp screw compressors, helium gas management and storage, and liquid helium and nitrogen storage for stand-alone operation. The magnet interfaces with the cryo refrigeration system through an LN2-shielded distribution box and transfer line system, both designed and fabricated by JLab. The distribution box uses a thermo siphon design to respectively cool four magnet coils and shields withmore » liquid helium and nitrogen. We describe the salient design features of the cryo system and discuss our recent commissioning experience.« less
Super-GM carries out R&D of 70 MW class superconducting generators (model machines), refrigeration system and superconducting wires to apply superconducting technology to electric power apparatuses. The helium refrigeration system for keeping field windings of superconducting generator (SCG) in cryogenic environment must meet the requirement of high reliability for uninterrupted long term operation of the SCG. In FY 1992, a high reliable conventional refrigeration system for the model machines was integrated by combining components such as compressor unit, higher temperature cold box and lower temperature cold box which were manufactured utilizing various fundamental technologies developed in early stage of the projectmore » since 1988. Since FY 1993, its performance tests have been carried out. It has been confirmed that its performance was fulfilled the development target of liquefaction capacity of 100 L/h and impurity removal in the helium gas to < 0.1 ppm. Furthermore, its operation method and performance were clarified to all different modes as how to control liquefaction rate and how to supply liquid helium from a dewar to the model machine. In addition, the authors have made performance tests and system performance analysis of oil free screw type and turbo type compressors which greatly improve reliability of conventional refrigeration systems. The operation performance and operational control method of the compressors has been clarified through the tests and analysis.« less
Cryogenic refrigeration systems are necessary for numerous applications. Gas purification and distillation require temperatures between 15 K and 200 K depending on the application, space simulation chambers down to 15 K, superconductivity between 1.8 K and up to 75 K (magnets, cavities or HTS devices like cables, FCL, SMES, etc), Cold Neutron Sources between 15 and 20 K, etc. Air Liquide Advanced Technologies is designing and manufacturing refrigerators since 60 years to satisfy those needs. The step by step developments achieved have led to machines with higher efficiency and reliability. In 1965, reciprocating compressors and Joule Thomson expansion valves were used. In 1969, centripetal expanders began to be used. In 1980, oil lubricated screw compressors took the place of reciprocating compressors and a standard range of Claude cycle refrigerators was developed: the HELIAL series. 1980 was also the time for cryogenic centrifugal compressor development. In 2011, driven by the need for lower operational cost (high efficiency and low maintenance), cycle oil free centrifugal compressors on magnetic bearings were introduced instead of screw compressors. The power extracted by centripetal expanders was recovered. Based on this technology, a range of Turbo-Brayton refrigerators has been designed for temperatures between 40 K and 150 K. On-going development will enable widening the range of Turbo-Brayton refrigerators to cryogenic temperatures down to 15 K.. Cryogenic centrifugal circulators have been developed in order to answer to an increasing demand of 4 K refrigerators able to distribute cold power.
Cryogenic refrigeration systems are necessary for numerous applications. Gas purification and distillation require temperatures between 15 K and 200 K depending on the application, space simulation chambers down to 15 K, superconductivity between 1.8 K and up to 75 K (magnets, cavities or HTS devices like cables, FCL, SMES, etc), Cold Neutron Sources between 15 and 20 K, etc. Air Liquide Advanced Technologies is designing and manufacturing refrigerators since 60 years to satisfy those needs. The step by step developments achieved have led to machines with higher efficiency and reliability. In 1965, reciprocating compressors and Joule Thomson expansion valves weremore » used. In 1969, centripetal expanders began to be used. In 1980, oil lubricated screw compressors took the place of reciprocating compressors and a standard range of Claude cycle refrigerators was developed: the HELIAL series. 1980 was also the time for cryogenic centrifugal compressor development. In 2011, driven by the need for lower operational cost (high efficiency and low maintenance), cycle oil free centrifugal compressors on magnetic bearings were introduced instead of screw compressors. The power extracted by centripetal expanders was recovered. Based on this technology, a range of Turbo-Brayton refrigerators has been designed for temperatures between 40 K and 150 K. On-going development will enable widening the range of Turbo-Brayton refrigerators to cryogenic temperatures down to 15 K.. Cryogenic centrifugal circulators have been developed in order to answer to an increasing demand of 4 K refrigerators able to distribute cold power.« less
Since 2009, the Large Hadron Collider (LHC) is in operation at CERN. The LHC superconducting magnets distributed over eight sectors of 3.3-km long are cooled at 1.9 K in pressurized superfluid helium. The nominal operating temperature of 1.9 K is produced by eight 1.8-K refrigeration units based on centrifugal cold compressors (3 or 4 stages depending to the vendor) combined with warm volumetric screw compressors with sub-atmospheric suction. After about 5 years of continuous operation, we will present the results concerning the availability for the final user of these refrigeration units and the impact of the design choice on the recovery time after a system trip. We will also present the individual results for each rotating machinery in terms of failure origin and of Mean Time between Failure (MTBF), as well as the consolidations and upgrades applied to these refrigeration units. 2b1af7f3a8