Decrease of phosphate concentration in a high rate pond by precipitation of calcium phosphate: Theoretical and experimental results

1992 ◽  
Vol 26 (11) ◽  
pp. 1445-1450 ◽  
Author(s):  
T. Moutin ◽  
J.Y. Gal ◽  
H. El Halouani ◽  
B. Picot ◽  
J. Bontoux
Keyword(s):  
Calcium Phosphate ◽  
Phosphate Concentration ◽  
Experimental Results ◽  
High Rate

Calcium phosphate granules formation: Key to high rate of mesophilic UASB treatment of toilet wastewater

2021 ◽  
Vol 773 ◽  
pp. 144972
Author(s):  
Lei Zhang ◽  
Anqi Mou ◽  
Huijuan Sun ◽  
Yingdi Zhang ◽  
Yun Zhou ◽  
...  
Keyword(s):  
Calcium Phosphate ◽  
High Rate

Improving the predictions of ASM2d through modelling in practice

2002 ◽  
Vol 45 (6) ◽  
pp. 199-208 ◽  
Author(s):  
L. Larrea ◽  
I. Irizar ◽  
M.E. Hildago
Keyword(s):  
Phosphorus Uptake ◽  
Pilot Scale ◽  
Phosphorus Release ◽  
Reduction Factor ◽  
Experimental Results ◽  
High Rate ◽  
Predictive Capacity ◽  
Kinetic Coefficients ◽  
Autotrophic Biomass ◽  
Rate Processes

The paper presents the adjustments carried out on the structure and in some default values of the kinetic coefficients of the ASM2d model in order to get an improved prediction for the experimental results obtained in pilot scale plants studies with different activated sludge treatment processes for carbon, nitrogen and phosphorous removal. In order to predict the high effluent filtered COD experimentally observed in high rate processes for carbon removal, a new model structure has been proposed, incorporating into the carbon model a soluble fraction of the slowly biodegradable substrate. Studies with the step feed and the alternating processes showed simultaneous nitrification-denitrification in aerated reactors which was predicted with increased values in the oxygen saturation coefficients for heterotrophic and autotrophic biomass. Both processes also showed loss of the denitrification capacity under unfavourable conditions, such us rains and low anoxic fraction, which required a very large decrease in the value of the reduction factor for denitrification so as to improve the predictions for effluent nitrate experimental results. Regarding phosphorus removal, the ASM2d model showed a satisfactory predictive capacity. For improved predictions of phosphorus release in anaerobic conditions, high values of the rate constant for storage of XPHA and low values of the anaerobic hydrolysis reduction factor were used. For phosphorus uptake in aerobic and anoxic conditions satisfactory predictions were obtained using the default values.

scholarly journals Assessment of Dental Implants with Modified Calcium-Phosphate Surface in a Multicenter, Prospective, Non-Interventional Study: Results up to 50 Months of Follow-Up

2019 ◽  
Vol 10 (1) ◽  
pp. 5
Author(s):  
Carles Subirà-Pifarré ◽  
Cristina Masuet-Aumatell ◽  
Carlos Rodado Alonso ◽  
Ricardo Medina Madrid ◽  
Cosimo Galletti
Keyword(s):  
Clinical Practice ◽  
Survival Rate ◽  
Calcium Phosphate ◽  
Observational Study ◽  
Dental Implants ◽  
Daily Practice ◽  
High Rate ◽  
Osseointegrated Implants ◽  
Study Results

Prescription of implant treatments is very widespread at present, mainly due to the low rate of annual loss and, to date, few studies have assessed their survival in the routine clinical practice of dentistry. The purpose of this observational study was to evaluate the effectiveness of dental implants with a calcium-phosphate surface in the daily practice of dental clinics. A multicenter, prospective, non-interventional, observational study was performed, in which three experienced practitioners (one maxillofacial and two oral surgeons) inserted implants using standard external and internal hexagon connections in adult patients requiring ≥1 osseointegrated implants to replace missing teeth. Follow-up was performed for 24 months after implant loading. Two hundred and twelve subjects were included (51.5% men), with a mean age of 51.2 ± 11.90 years, in whom 544 implants were inserted. 87.2% of the patients received 1–4 implants. The preferred connection system was internal hexagon (73.5%). There were nine failures, with an interval survival rate (ISR) at 24 months of 100% and a cumulative survival rate (CSR) of 98.3%. In conclusion, implants with a modified calcium-phosphate surface are associated with a high rate of survival and may be considered a method of choice in clinical practice.

A Theoretical Model for High Rate Electrochemical Machining

1973 ◽  
Vol 95 (4) ◽  
pp. 1003-1008 ◽  
Author(s):  
S. P. Loutrel ◽  
N. H. Cook
Keyword(s):  
Theoretical Model ◽  
Electrochemical Machining ◽  
Experimental Results ◽  
High Rate ◽  
Simplified Model ◽  
Complex Geometries ◽  
Machining Parameters ◽  
Computer Solution ◽  
Cutting Zone ◽  
Current Densities

A theoretical model for the process occurring in the cutting zone is developed. A computer solution to apply the model to an actual ECM situation is outlined. A simplified model and computer solution is described which can be used to predict machining parameters for complex geometries. For both models good correlation of experimental results is found in most cases. The application of classical electrochemistry to conditions where extreme current densities (5800 amps/cm2) are encountered is discussed.

Detection of Shifts in GPS Measurements for a Long-Span Bridge Using CUSUM Chart

2016 ◽  
Vol 16 (04) ◽  
pp. 1640024 ◽  
Author(s):  
Ting-Hua Yi ◽  
Hong-Nan Li ◽  
Gangbing Song ◽  
Qing Guo
Keyword(s):  
Deformation Monitoring ◽  
Experimental Results ◽  
High Rate ◽  
Cumulative Distribution ◽  
Control Technique ◽  
Cusum Chart ◽  
Shewhart Chart ◽  
Long Span ◽  
Long Span Bridge ◽  
Shift Detection

Timely and correctly evaluating the quality of Global Positioning System (GPS) data is essential for reduction in the number of false alarms and missed detection of a GPS-based bridge deformation monitoring system. This paper investigates how to use the statistical process control technique, known as the cumulative sum (CUSUM) chart, for the detection of small but persistent shifts in the high-rate GPS carrier-phase measurements. First, a mathematical model for the shift detection based on the continuous hypothesis testing is established. The main features and implementation procedure of the CUSUM chart for the shift detection are then summarized, and the corresponding parameter selection method is discussed in detail. To meet the normality requirement of the CUSUM chart, a novel method that transfers the data to the Q-statistic by the estimated cumulative distribution functions is proposed according to the probability integral transform theory. This is followed by a simulation carried out to evaluate the detection performance of the CUSUM chart and exploit its advantages to the commonly used Shewhart chart for the high-rate GPS monitoring data with different shift sizes. Experimental results have showed that the CUSUM chart is sensitive to small persistent shifts compared to the Shewhart chart although it has a delay problem. The integration of CUSUM chart and Shewhart chart would be a reliable approach for the shift detection. Finally, an on-site dynamic monitoring experiment is carried out on a long-span bridge to validate the proposed approach’s effectiveness in detecting an actual deformation shift, and the experimental results proved to be very encouraging.

scholarly journals The protective effect of supplemental calcium on colonic permeability depends on a calcium phosphate-induced increase in luminal buffering capacity

2011 ◽  
Vol 107 (7) ◽  
pp. 950-956 ◽  
Author(s):  
Marloes A. A. Schepens ◽  
Sandra J. M. ten Bruggencate ◽  
Arjan J. Schonewille ◽  
Robert-Jan M. Brummer ◽  
Roelof van der Meer ◽  
...  
Keyword(s):  
Calcium Phosphate ◽  
Protective Effect ◽  
Intestinal Permeability ◽  
Buffering Capacity ◽  
Phosphate Concentration ◽  
Dietary Adaptation ◽  
Supplemental Calcium ◽  
Dietary Phosphate ◽  
Lactate Levels ◽  
High Phosphate

An increased intestinal permeability is associated with several diseases. Previously, we have shown that dietary Ca decreases colonic permeability in rats. This might be explained by a calcium-phosphate-induced increase in luminal buffering capacity, which protects against an acidic pH due to microbial fermentation. Therefore, we investigated whether dietary phosphate is a co-player in the effect of Ca on permeability. Rats were fed a humanised low-Ca diet, or a similar diet supplemented with Ca and containing either high, medium or low phosphate concentrations. Chromium-EDTA was added as an inert dietary intestinal permeability marker. After dietary adaptation, short-chain fructo-oligosaccharides (scFOS) were added to all diets to stimulate fermentation, acidify the colonic contents and induce an increase in permeability. Dietary Ca prevented the scFOS-induced increase in intestinal permeability in rats fed medium- and high-phosphate diets but not in those fed the low-phosphate diet. This was associated with higher faecal water cytotoxicity and higher caecal lactate levels in the latter group. Moreover, food intake and body weight during scFOS supplementation were adversely affected by the low-phosphate diet. Importantly, luminal buffering capacity was higher in rats fed the medium- and high-phosphate diets compared with those fed the low-phosphate diet. The protective effect of dietary Ca on intestinal permeability is impaired if dietary phosphate is low. This is associated with a calcium phosphate-induced increase in luminal buffering capacity. Dragging phosphate into the colon and thereby increasing the colonic phosphate concentration is at least part of the mechanism behind the protective effect of Ca on intestinal permeability.

The Quantitative Use of the Seinhorst ‘Mistifier’ to Recover Nematodes from Soil, Faeces and Herbage

1961 ◽  
Vol 35 (3-4) ◽  
pp. 309-314 ◽  
Author(s):  
R. F. Sturrock
Keyword(s):  
Experimental Results ◽  
High Rate ◽  
Rate Of Recovery ◽  
Short Time ◽  
Quantitative Recovery

A modified form of the Seinhorst “Mistifie.” is described which allows the quantitative recovery of nematodes from infested material. Experimental results are given showing the high rate of recovery in a short time, the recovery from a known number of nematodes and a not excessive degree of variation between recoveries from a replicated series of mistifier units. These results are discussed and the value of the technique for replicated quantitative work is stressed.

scholarly journals COVID 19 Data Clustering a nd Testing with K Means Mapper and Reducer

2021 ◽  
Vol 11 (2) ◽  
pp. 23-25
Author(s):  
A. Anusha ◽  
◽  
Dr. K. Kishore Raju ◽  
Keyword(s):  
Infectious Disease ◽  
Distributed Computing ◽  
Large Volume ◽  
Data Clustering ◽  
Experimental Results ◽  
High Rate ◽  
Computing Environment ◽  
Data Volume ◽  
Very High

Due to the emergence of a new infectious disease (COVID-19), the worldwide data volume has been quickly increasing at a very high rate during the last two years. Due its infectious, and importance, in this paper, K-Means clustering procedure is applied on COVID data in MapReduce based distributed computing environment. The proposed system is store, process and tests the large volume of COVID-19 data. Experimental results had been proved that this process is adaptable to COVID-19 data in the formation of trusted clusters.

Sign in / Sign up

Export Citation Format

Share Document