A class of linear-complexity, soft-decodable, high-rate, "good" codes: construction, properties and performance

2002 ◽  
Author(s):  
Jing Li ◽  
K.R. Narayanan ◽  
C.N. Georghiades
Keyword(s):  
Linear Complexity ◽  
High Rate ◽  
And Performance

Upgrading Wastewater Treatment Plants with Anaerobic Selectors

1990 ◽  
Vol 22 (7-8) ◽  
pp. 35-43
Author(s):  
K. D. Tracy ◽  
S. N. Hong
Keyword(s):  
Phosphorus Removal ◽  
Wastewater Treatment Plants ◽  
Full Scale ◽  
High Rate ◽  
Nitrogen Control ◽  
Biological Phosphorus Removal ◽  
Conventional Activated Sludge ◽  
And Performance ◽  
Activated Sludge Processes ◽  
Biological Phosphorus

The anaerobic selector of the A/0™ process offers many advantages over conventional activated sludge processes with respect to process performance and operational stability. This high-rate, single-sludge process has been successfully demonstrated in full-scale operations for biological phosphorus removal and total nitrogen control in addition to BOD and TSS removal. This process can be easily utilized in upgrading existing treatment plants to meet stringent discharge limitations and to provide capacity expansion. Upgrades of two full-scale installations are described and performance data from the two facilities are presented.

scholarly journals Design and performance of SiPM-based readout of PbF2 crystals for high-rate, precision timing applications

2017 ◽  
Vol 12 (01) ◽  
pp. P01009-P01009 ◽  
Author(s):  
J. Kaspar ◽  
A.T. Fienberg ◽  
D.W. Hertzog ◽  
M.A. Huehn ◽  
P. Kammel ◽  
...  
Keyword(s):  
High Rate ◽  
And Performance

scholarly journals Exploring the Efficacy of Facebook Groups for Collective Occupant Learning About Using Their Homes

2017 ◽  
Vol 61 (7) ◽  
pp. 757-773 ◽  
Author(s):  
Magdalena Baborska-Narozny ◽  
Eve Stirling ◽  
Fionn Stevenson
Keyword(s):  
Urban Communities ◽  
Collective Efficacy ◽  
Best Practice ◽  
Evaluation Studies ◽  
Group Development ◽  
High Rate ◽  
Residential Developments ◽  
And Performance ◽  
Context Specific ◽  
Quality Learning

Using Facebook Groups to connect otherwise anonymous people that live in a single urban development is a relatively new phenomenon. Within residential developments, there are a number of common comfort, management, and performance issues experienced by many isolated inhabitants that are identified through building performance evaluation studies. Facebook is a ubiquitous social network tool and powerful communication platform, particularly popular among young adults. This article explores the use of closed Facebook Groups in relation to collective learning about home use in two residential communities in the United Kingdom. Data were collected through longitudinal digital and physical visits to case study residential developments and to the Facebook Group sites. Group development, dynamics, and the quality of knowledge sharing is evaluated. Findings are presented in relation to home use learning, as it proved to be a vital theme of each Group’s activity. We propose that weak-tie urban communities can develop collective efficacy through communicating on a Facebook Group that enables quality learning based on reciprocal sharing of experiences and knowledge by its members. This helps tackle comfort issues experienced, lower the cost of living, and share bespoke, context-specific home use best practice. Strong engagement and leadership of group administrators limited to early stages of the Groups’ formation followed by high rate of activity by the majority of members was key. There was a clear overlap observed between social media narrative and the physical experiences of daily life, which helps support residents. The analysis suggests the positive effect of the learning environment created bottom-up would not be easily transferable to professional applications.

Implementation of Multistack Sand Exclusion Methodology in Extremely Unconsolidated Wells: Learnings from Marginal Daman Field, Western Offshore India

2021 ◽  
Author(s):  
Ravindra M Patil ◽  
P V Murthy ◽  
Kutbuddin Bhatia ◽  
Mayur Deshpande ◽  
Karan Pande
Keyword(s):  
Success Factors ◽  
Gas Production ◽  
High Rate ◽  
High Stakes ◽  
Carrier Fluid ◽  
Packing Factor ◽  
Sand Control ◽  
Core Study ◽  
And Performance ◽  
Good Productivity

Abstract The Daman marginal field is a prolific gas-producing clastic field with highly unconsolidated Paleo-Miocene sandstone formations and a wide variety of lithologies across multistack sand layers. As such, high-rate water packs (HRWPs) are the ideal completion method in many Mumbai fields. Because multistack reservoirs require good zonal isolation, and to prevent crossflow between reservoirs with different pressure regimes, multistack sand exclusion (MSSE) methodology was selected for primary well completions with minimum rig time and a high degree of treatment placement accuracy. From an operational standpoint, exploiting these layers using this method means more control points can be achieved across these heterogeneous layers, and the MSSE completion is ideal for multiple applications in a shorter period, helping sustain sand-circumscribed gas production from these unconsolidated layers. During the design phase, grain-size distributions and core study defined the sand range from generally clean, coarse, and sorted to poorly sorted, with high-fines content and clay rich. To address the unique challenges of deep offshore operations, formation technical difficulties, high-stakes economics, and the significant untapped potential from these Daman sands, the MSSE approach was designed and implemented in this field. Historically, for multistack wells, an HRWP is performed zone by zone whereby the process of sump packer installation, perforation run, deburr run, screen assembly installation, and pumping is repeated for each zone. In Well A, the MSSE system was applied without any repetition and all in one phase. All layers were perforated and positively isolated. Each interval was individually opened for the HRWP treatment using a low-friction low-residue carrier fluid. Using a high-packing-factor proppant at a higher rate, the well was treated sequentially from the bottom of the interval to the top. Many marginal fields in this basin have become uneconomical because of the high cost and complexity of sand control methodology. Therefore, reducing costs and time becomes vital to help ensure economic viability, as well as achieving significant operational efficiencies. Additionally, reducing near-wellbore (NWB) mechanical skin and ensuring good productivity from the reservoir are among the major solutions when implementing an MSSE completion. The methodology adopted significantly helped reduce expenditures by standardizing completion design, simplifying the core complexity, and enhancing overall reliability and operational efficiency. The optimized engineering workflow was fit for purpose, rather than the conventional “cookie-cutter” method to address sanding propensity in this field. This paper discusses the cutting-edge MSSE completion systems that focused on downhole completion and modifications for pumping operations. Additionally, the paper reviews challenges addressed during this campaign, workflow adapted, detailed strategy success factors, and positive results obtained during evaluation. This has helped reduce potential risks and improve reliability and performance, which can act as best practices and can be applied within similar fields.

Post Endoscopy Barrett’s Neoplasia (PEBN) After A Negative Index Endoscopy: A Systematic Review & Proposal For Definitions and Performance Measures in Endoscopy

Endoscopy ◽  
2022 ◽  
Author(s):  
Madhav Desai ◽  
David A Lieberman ◽  
Sachin Srinivasan ◽  
Venkat Nutalapati ◽  
Abhishek Challa ◽  
...  
Keyword(s):  
Systematic Review ◽  
Barrett’S Esophagus ◽  
Barrett's Esophagus ◽  
Meta Analysis ◽  
Incidence Rates ◽  
High Rate ◽  
Negative Index ◽  
Inclusion Criteria ◽  
Surveillance Interval ◽  
And Performance

Background and aims: A high rate of neoplasia (high grade dysplasia; HGD and esophageal adenocarcinoma; EAC) has been reported in Barrett’s Esophagus at index endoscopy but precise rates of post endoscopy Barrett’s neoplasia (PEBN) are unknown. Methods: Systematic review and meta-analysis was performed examining electronic databases (inception to October 2021) for studies reporting PEBN. Consistent with definitions of Post Colonoscopy Colorectal Cancer as proposed by the World Endoscopy Organization, we defined neoplasia(HGD/EAC) detected at index endoscopy and/or within 6 months of a negative index endoscopy as “prevalent” neoplasia; those detected after 6 months of a negative index endoscopy and prior to next surveillance interval(i.e. 3 years) as PEBN or “interval” neoplasia, and those detected after 36 months of a negative index endoscopy as “incident” neoplasia. Pooled incidence rates and proportion relative to total neoplasia were analyzed. Results: 11 studies (n=59,795, age:62.3±3.3 years, 61%males) met inclusion criteria. The pooled incidence rates were: prevalent neoplasia 4.5% (95%confidence interval: 2.2-8.9) at baseline and additional 0.3%(0.1-0.7) within first 6 months, PEBN 0.52%(0.48-0.58) and incident neoplasia: 1.41%(0.93-2.14). At 3 years from index endoscopy, PEBN accounted for 3% while prevalent neoplasia accounted for 97% of total Barrett’s neoplasia. Conclusion: Neoplasia detected at or within 6 months of index endoscopy account for most of the Barrett’s neoplasia(>90%). Post-Endoscopy Barrett’s Neoplasia account for ~3% of cases and can be used for validation in future. This highlights the importance of a high-quality index endoscopy in Barrett’s Esophagus and the need to establish quality benchmarks to measure endoscopists’ performance.

Influence of deposition rate on the properties of thick YBa2Cu3O7–δ films

1997 ◽  
Vol 12 (11) ◽  
pp. 2941-2946 ◽  
Author(s):  
S. R. Foltyn ◽  
E. J. Peterson ◽  
J. Y. Coulter ◽  
P. N. Arendt ◽  
Q. X. Jia ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Deposition Rate ◽  
Current Density ◽  
Oxygen Deficiency ◽  
Lattice Parameter ◽  
High Rate ◽  
Superconducting Transition ◽  
And Performance ◽  
Low Rate

To investigate potential limits to the rate at which high-quality YBa2Cu3O7–δ can be deposited, we have produced a series of 1 μm thick films by pulsed laser deposition on single-crystal SrTiO3 substrates at average rates ranging from 2 Å/s to 240 Å/s. The critical current density of low-rate films was over 2 MA/cm2 at 75 K, self field, but dropped linearly with rate to about 1 MA/cm2 at the upper end of the range. In addition, the superconducting transition temperature, resistivity above the transition, and performance in an applied magnetic field were all degraded by increasing the deposition rate. A change in c-axis lattice parameter suggests that possible causes for this degradation are oxygen deficiency or cation disorder with the latter being the more likely. Annealing high-rate films at 790 °C for as little as 20 min improved critical current density to within 20% of low-rate values, and resulted in dramatic improvements in other film properties as well.

scholarly journals Performance and Return to Sport After Thumb Ulnar Collateral Ligament Surgery in National Football League Players

Hand ◽  
2018 ◽  
Vol 14 (4) ◽  
pp. 487-493 ◽  
Author(s):  
Kyle R. Sochacki ◽  
Robert A. Jack ◽  
Richard Nauert ◽  
Shari R. Liberman ◽  
Patrick C. McCulloch ◽  
...  
Keyword(s):  
National Football League ◽  
Return To Sport ◽  
Ulnar Collateral Ligament ◽  
High Rate ◽  
Collateral Ligament ◽  
Postoperative Performance ◽  
Paired Samples ◽  
Significant Difference ◽  
Postoperative Time ◽  
And Performance

Background: Acute ruptures of the ulnar collateral ligament (UCL) of the thumb are common injuries in sports. Surgical repair of complete tears has yielded excellent results in elite athletes. Methods: National Football League (NFL) players who underwent thumb UCL surgery and matched controls were identified. Demographic and performance data were collected. Performance scores were calculated using a standardized scoring system. Return to sport (RTS) in the NFL was defined as playing in at least 1 NFL game after thumb UCL surgery. Comparisons between case and control groups and preoperative and postoperative time points were made using paired-samples Student t tests. Results: Twenty-three players were identified (mean age: 28.8 ± 3.4 years and mean experience in the NFL: 5.9 ± 3.4 years). Twenty-two players (95.7%) were able to return to sport in the NFL at an average of 132.2 ± 126.1 days. The overall 1-year NFL career survival rate of players undergoing thumb UCL surgery was 87.0%. There was not a statistically significant decrease in games per season and career length for any position following surgery. No positions had a significant difference in postoperative performance when compared with preoperative performance, and there was no significant performance difference postoperatively when compared with matched controls. Conclusions: There is a high rate of RTS in the NFL following thumb UCL surgery. Players who underwent thumb UCL surgery played in a similar number of games per season and had similar career lengths in the NFL as controls. No position group had any significant postoperative performance score differences when compared with postindex matched controls.

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