scholarly journals Performance Evaluation of Soil Cell

2021 ◽  
Author(s):  
Lianghao Chen
Keyword(s):  
Laboratory Testing ◽  
Copper Concentration ◽  
Lead Concentration ◽  
Statistical Significance ◽  
Low Impact Development ◽  
Field Performance ◽  
Concentration Increase ◽  
Monitoring Result ◽  
Perforated Pipe ◽  
Development Practice

Soil Cell is a novel Low-Impact Development practice that is suitable for densely developed urban environment. This thesis seeks to gain further understanding of soil cell’s performance in terms of water quality and quality control; and to assess the exfiltration performance of perforated pipe in soil cells by monitoring an active cell. The monitoring result showed that the cell was very effective in treating particulate (90% concentration reduction), metal (91% lead concentration reduction to 53% copper concentration reduction) and phosphorus (74% concentration reduction). The cell was ineffective in treating chloride (1% concentration increase, no statistical significance) and even caused nitrate leaching (65% concentration increase). Field performance of the soil cell indicated that the inflow perforated backed up frequently, restricting the flow into the cell but laboratory testing of the perforated pipes’ hydraulic performance confirms that the pipe has a sufficient capacity to convey the flows of up to 10 L/s.

scholarly journals Performance Evaluation of Soil Cell

2021 ◽  
Author(s):  
Lianghao Chen
Keyword(s):  
Laboratory Testing ◽  
Copper Concentration ◽  
Lead Concentration ◽  
Statistical Significance ◽  
Low Impact Development ◽  
Field Performance ◽  
Concentration Increase ◽  
Monitoring Result ◽  
Perforated Pipe ◽  
Development Practice

Soil Cell is a novel Low-Impact Development practice that is suitable for densely developed urban environment. This thesis seeks to gain further understanding of soil cell’s performance in terms of water quality and quality control; and to assess the exfiltration performance of perforated pipe in soil cells by monitoring an active cell. The monitoring result showed that the cell was very effective in treating particulate (90% concentration reduction), metal (91% lead concentration reduction to 53% copper concentration reduction) and phosphorus (74% concentration reduction). The cell was ineffective in treating chloride (1% concentration increase, no statistical significance) and even caused nitrate leaching (65% concentration increase). Field performance of the soil cell indicated that the inflow perforated backed up frequently, restricting the flow into the cell but laboratory testing of the perforated pipes’ hydraulic performance confirms that the pipe has a sufficient capacity to convey the flows of up to 10 L/s.

scholarly journals Morphological and Molecular Characterization of Some Egyptian Six-Rowed Barley (Hordeum vulgare L.)

Plants ◽  
2021 ◽  
Vol 10 (11) ◽  
pp. 2527
Author(s):  
Azza H. Mohamed ◽  
Ahmad A. Omar ◽  
Ahmed M. Attya ◽  
Mohamed M. A. Elashtokhy ◽  
Ehab M. Zayed ◽  
...  
Keyword(s):  
Molecular Characterization ◽  
Seed Quality ◽  
Statistical Significance ◽  
Mean Field ◽  
Morphological Characteristics ◽  
Field Performance ◽  
Rbcl Gene ◽  
Hordeum Vulgare L ◽  
Barley Cultivars ◽  
Plastid Markers

Barley production is essential in Egypt. In the present study, 15 different six-rowed Egyptian barley cultivars were studied. To differentiate between the different cultivars under study in terms of morphological characteristics and ISSR, molecular characterization reactions were carried out. Moreover, four cultivars (Giza 123, Giza 126, Giza 136, and Giza 138) were selected for further studies using scanning electron microscopy (SEM). Computational analysis of the DNA barcoding sequences of the two plastid markers rbcL and matK was executed, and the results were deposited in the NCBI database. The morphological traits showed low statistical significance among the different cultivars under study via the data collected from two seasons, suggesting that the mean field performance of these Egyptian cultivars may be equal under these conditions. The results showed that the phylogenetic tree was divided into four groups, one of which contained the most closely related genotypes in the genetic distance, including Giza 124, Giza 130, Giza 138, Giza 136, and Giza 137, which converge in the indicative uses of farmers. The seed coat of the studied cultivars was “rugose”. The elevation folding of the rugose pattern ranged from 11 ± 1.73 µm (Giza 126) to 14.67 ± 2.43 µm (Giza 123), suggesting variation in seed quality and its uses in feed and the food industry. According to the similarity matrix of ISSR analysis, the highest similarity value (93%) was recorded between Giza 133 and Giza 132, as well as between Giza 2000 and Giza 126. On the other hand, the lowest similarity value (80%) was recorded between Giza 130 and (Giza 133 and Giza 132), indicating that these cultivars were distantly related. Polymorphism information content (PIC) ranged from 0.26 for the primer ISSR UBC 835 to 0.37 for the primers ISSR UBC 814 and ISSR UBC 840. The current study showed that the matK gene is more mutable than the rbcL gene among the tested cultivars.

GRASSHOPPER CONTROL: LABORATORY TESTING AS A MEANS OF EVALUATING FIELD PERFORMANCE

1969 ◽  
Vol 101 (2) ◽  
pp. 159-163 ◽  
Author(s):  
K. S. McKinlay
Keyword(s):  
Laboratory Testing ◽  
Direct Contact ◽  
Field Performance ◽  
Control Laboratory ◽  
Melanoplus Sanguinipes ◽  
Wheat Seedlings ◽  
Control Equivalent ◽  
Better Than

AbstractFourteen insecticides were tested by direct contact against second-instar nymphs of a grasshopper, Melanoplus sanguinipes F. Of these, seven were judged to be sufficiently promising to be compared for toxicity and persistence as deposits on wheat seedlings. Comparison with a dieldrin standard showed that Dursban, Dibrom, and malathion were extremely effective by contact but had little persistence on growing wheat. Baygon was extremely effective by contact and showed some persistence. CIBA 9643 and dimethoate were the only two compounds to show persistent effects almost equivalent to dieldrin, and CIBA 9643 was more toxic than dieldrin by direct contact.It was concluded that CIBA 9643 was the only compound, of those tested, which might give grasshopper control equivalent to, or better than, dieldrin or the currently recommended dimethoate.

Using Gyratory Compaction to Investigate Density and Mechanical Properties of Roller-Compacted Concrete

2003 ◽  
Vol 1834 (1) ◽  
pp. 77-84 ◽  
Author(s):  
Nader Amer ◽  
Norbert Delatte ◽  
Chris Storey
Keyword(s):  
Mechanical Properties ◽  
Laboratory Testing ◽  
Field Performance ◽  
High Strength ◽  
Heavy Duty ◽  
Roller Compacted Concrete ◽  
Gyratory Compaction ◽  
Compactive Effort ◽  
Vibrating Table ◽  
Comparison Field

Roller-compacted concrete (RCC) is a durable, economical, low-maintenance material for low-speed, heavy-duty paving applications, including industrial and multimodal pavements. However, it is difficult to prepare laboratory specimens to represent field performance, because RCC is very dry and requires considerable compactive effort to achieve field densities. The gyratory compactor, commonly used to prepare hot-mix asphalt specimens, may be used in preparing specimens for laboratory testing. Materials and mix designs from two industrial paving projects were used to prepare specimens for comparison. Field results indicated that the gyratory compactor produced specimens with mechanical properties consistent with those achieved in the field. Specimens had high strength and consistent density, with low variability. The gyratory compactor may be used to replace other methods presently used for preparing RCC specimens such as the modified Vebe apparatus, the vibrating table, and the vibrating hammer. These methods have limitations that may be overcome with the gyratory compactor because of its consistency and its compatibility with field results. The effects of density and specimen aspect ratio on compressive and splitting tensile strength were investigated. The number of gyrations applied to the specimen may be used to duplicate the desired field density. For the industrial pavements investigated, approximately 60 gyrations accurately replicated field conditions.

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