scholarly journals An experimental study on effects of fluoridated water on Abelmoschus esculentus var. Soh-198 (Lady Finger)

2021 ◽  
Vol 5 (1) ◽  
pp. 017-019
Author(s):  
Iram Arshi
Keyword(s):  
Experimental Study ◽  
Crop Yield ◽  
Irrigation Water ◽  
Plant Part ◽  
Pot Experiment ◽  
Abelmoschus Esculentus ◽  
Distilled Water ◽  
The Third ◽  
Different Parts

An experimental study of fluoride (F) accumulation in Abelmoschus esculentus var. Soh-198 and its effect on the growth and crop yield was conducted in a pot experiment. Eight different concentrations of F in the water were used for irrigation ranging from 2 to 14 ppm with distilled water as the control. Potentiometric determinations of the F content in different parts of the plant were made 45, 60, and 120 days after sowing the seeds (first, second, and third harvest, respectively). At the third harvest the highest mean plant part concentrations of F were recorded with 14 ppm F in the irrigation water: 9.0638 mg/kg in the roots, 5.6896 mg/kg in shoot, 4.5348 mg/kg in leaf and 3.563 mg/kg in fruit.

scholarly journals Combined application of biochar with fertilizer promotes nitrogen uptake in maize by increasing nitrogen retention in soil

Biochar ◽  
2021 ◽  
Author(s):  
Jing Peng ◽  
Xiaori Han ◽  
Na Li ◽  
Kun Chen ◽  
Jinfeng Yang ◽  
...  
Keyword(s):  
Crop Yield ◽  
N Uptake ◽  
Nitrogen Retention ◽  
N Recovery ◽  
Chemical Fertilizers ◽  
Total N ◽  
Residual Rate ◽  
The Third ◽  
Combined Application ◽  
Entire Experiment

AbstractCombined application of biochar with fertilizers has been used to increase soil fertility and crop yield. However, the coupling mechanisms through which biochar improves crop yield at field scale and the time span over which biochar affects carbon and nitrogen transformation and crop yield are still little known. In this study, a long-term field trial (2013–2019) was performed in brown soil planting maize. Six treatments were designed: CK—control; NPK—application of chemical fertilizers; C1PK—low biochar without nitrogen fertilizer; C1NPK, C2NPK and C3NPK—biochar at 1.5, 3 and 6 t ha−1, respectively, combined with chemical fertilizers. Results showed that the δ15N value in the topsoil of 0–20 cm layer in the C3NPK treatment reached a peak of 291 ‰ at the third year (2018), and demonstrated a peak of 402 ‰ in the NPK treatment in the initial isotope trial in 2016. Synchronously, SOC was not affected until the third to fourth year after biochar addition, and resulted in a significant increase in total N of 2.4 kg N ha−1 in 2019 in C3NPK treatment. During the entire experiment, the 15N recovery rates of 74–80% were observed highest in the C2NPK and C3NPK treatments, resulting in an annual increase in yields significantly. The lowest subsoil δ15N values ranged from 66‰ to 107‰, and the 15N residual rate would take 70 years for a complete decay to 0.001% in the C3NPK. Our findings suggest that biochar compound fertilizers can increase C stability and N retention in soil and improve N uptake by maize, while the loss of N was minimized. Biochars, therefore, may have an important potential for improving the agroecosystem and ecological balance. Graphic abstract

scholarly journals Pivoted-Pad Journal Gas Bearing Performance in Exploratory Operation of Brayton Cycle Turbocompressor

1968 ◽  
Vol 90 (4) ◽  
pp. 687-696 ◽  
Author(s):  
R. Y. Wong ◽  
W. L. Stewart ◽  
H. E. Rohlik
Keyword(s):  
Experimental Study ◽  
Journal Bearing ◽  
Inert Gas ◽  
Brayton Cycle ◽  
Ambient Conditions ◽  
Operating Characteristics ◽  
The Third ◽  
Loading Device ◽  
Bearing Design ◽  
Gas Bearing

This paper describes findings obtained to date in the area of journal gas bearings from an experimental study of a Brayton cycle turbocompressor designed for the requirements of a two-shaft 10-kw space power system. The journal bearing design utilizes three pads pivoted on conforming balls and sockets. Two of the pivots are rigidly mounted to the frame, and the third pivot is mounted to the frame through a low-spring-rate diaphragm. This paper describes the salient package and bearing design features and then presents the principal results obtained from testing the package in both a spin calibration rig and operation at design temperature conditions with an inert gas. The results discussed include (a) the successful use of a pneumatic loading device to vary pad load during operation, (b) the operating characteristics of the bearings as obtained over a range of pad loads and ambient conditions, (c) structural and dynamic behavior of the bearing-support system during design temperature operation and (d) a discussion of the wear characteristics of the conforming ball-and-socket pivot as obtained from the tests made to date.

scholarly journals Study and Analysis of Anti Vibratory Passive and Active Methods Applied to Complex Mechanical System

2012 ◽  
Vol 7 (2) ◽  
Author(s):  
Cédric Lopez ◽  
François Malburet ◽  
André Barraco
Keyword(s):  
Experimental Study ◽  
Comparative Analysis ◽  
Mechanical System ◽  
High Speed ◽  
Test Bench ◽  
Minimization Method ◽  
Controlled System ◽  
Proper Frequency ◽  
Different Parts ◽  
Methods Of Control

This paper studies problematic of a mechanical system composed of different coupled parts submitted to a high speed shock and proposes analysis of anti vibratory passive and active methods based on an experimental and theoretical coupled approach. After a shock, different parts of the system oscillate. If one of them is excited at a particular frequency, such as its proper frequency, important oscillations appear and can lead to the deterioration of the system by introducing important stresses. In this paper, we propose an analysis in order to understand this kind of problem and what we can do to avoid it. Firstly, we discuss problematic and we expose the studied system. In a second time, we develop two approaches of modeling that allow us to understand the phenomenon by carrying out numerical simulations. Then cross checking of model is completed via experimental study on drop test bench. Passive minimization method of vibrations based on experimental and theoretical coupled approach is exposed. Finally, a comparative analysis of different methods of control and experimental results of controlled system are presented.

scholarly journals Effect of arsenic on Amaranthus gangeticus

2018 ◽  
Vol 53 (4) ◽  
pp. 259-264
Author(s):  
MZ Hossain ◽  
Sushmita Dey ◽  
MS Islam
Keyword(s):  
Irrigation Water ◽  
Crop Production ◽  
Growth Yield ◽  
Dry Weight ◽  
Arsenic Contamination ◽  
Pot Experiment ◽  
Production Potential ◽  
Groundwater Arsenic ◽  
Major Nutrients

Groundwater arsenic contamination has become a threat to the crop production potential in the soils of vast areas of Bangladesh. Situation is grave in some districts of the country, particularly the southern part. A pot experiment was conducted to investigate the effects of arsenic treated irrigation water (0, 1, 2, 5 and 10 mgL-1), where a total of ten (10) irrigations were provided thus the treatments received 0, 10, 20, 50, and 100 mg arsenic (As) pot-1. Effects of applied levels of arsenic on Amaranthus gangeticus (Lal shak) were evaluated in terms of the growth, yield, major nutrients’ content, and their translocation in the plant. As treatments significantly reduced (p≤0.05) the dry weight of shoot and root by 19.31% and 44.03% respectively. Both total and available concentrations of nitrogen (N), potassium (K) and sulfur (S) were significantly (p≤ 0.05) suppressed by the As treatments, while only higher three doses significantly (p≤ 0.05) affected both levels of concentrations of phosphorus (P), calcium (Ca) and magnesium (Mg). Translocation coefficients for soil to root for P, K, S, and Mg were significantly reduced (p≤ 0.05), while translocation coefficients for root to shoot were significantly increased (p≤ 0.05) for K and S by 5 and 10 mgL-1 of arsenic treatments.Bangladesh J. Sci. Ind. Res.53(4), 259-264, 2018

Experimental Study of Electrical Discharge Grinding Honeycomb Tori

2012 ◽  
Vol 468-471 ◽  
pp. 924-927
Author(s):  
Ji Gao ◽  
Xiao Fang Ma ◽  
Qing Yang Liu
Keyword(s):  
Experimental Study ◽  
Experimental Analysis ◽  
Electrical Discharge ◽  
Electrical Parameters ◽  
Processing Efficiency ◽  
Technological Design ◽  
Machining Precision ◽  
Different Parts

Through the research of domestic and international aviation engine seal pieces, this paper have described the structure and technological design of electrical discharge grinding honeycomb torus. Based on experimental analysis of processing precision and processing efficiency under different electrical parameters, machining sections were designed according to the processing requirements of different parts. The results indicate that the machining precision and efficiency can be enhanced greatly.

scholarly journals USEFULNESS OF GASTRIC SUBMUCOSAL DISSECTION DEPTH TO EVALUATE SKILL ACQUIREMENT IN SHORT TERM TRAINING COURSES IN ESD: AN EXPERIMENTAL STUDY

2018 ◽  
Vol 55 (3) ◽  
pp. 221-229 ◽  
Author(s):  
Kendi YAMAZAKI ◽  
Eduardo Guimarães Hourneaux de MOURA ◽  
Mariana Matera VERAS ◽  
Luiz Henrique MESTIERI ◽  
Paulo SAKAI
Keyword(s):  
Experimental Study ◽  
Adverse Events ◽  
Learning Curve ◽  
Intraoperative Complications ◽  
Gastric Body ◽  
Short Term ◽  
Roc Curve Analysis ◽  
The Third ◽  
Submucosal Dissection ◽  
Training Courses

ABSTRACT BACKGROUND: Endoscopic submucosal dissection (ESD) is a complex endoscopic procedure, with high rates of adverse events and technical difficulties. To overcome that problem, many training centers published the importance of animal models for skill acquirement in ESD. However, no study has used the submucosal dissection depth (DSUB) as a parameter to evaluate the learning curve in ESD, which might be a relevant factor since an optimal resection plane is important to achieve a curative resection and avoid intraoperative complications. OBJECTIVE: This study aimed to assess ESD skill acquirement after short-term training sessions by evaluating the submucosal dissection depth (DSUB) and the association with adverse events. METHODS: This experimental study included 25 experienced endoscopists in therapeuthic procedures (>5years) and 75 specimens resected by ESD (three resections / endoscopist). Learning parameters (resection time, size, en bloc resection rate, bleeding, perforation and submucosal dissection depth) were prospectively evaluated. The percentages of DSUB of all specimens resected were calculated. RESULTS: All specimens were resected from the gastric body (n=75). The mean size of the resected specimens was 23.97±7.2 mm. The number of adverse events, including bleeding, perforation, and death, were 17 (22.67%), 3 (4%), and 0 cases, respectively. The average mean time by the third dissection decreased from 28.44±9.73 to 18.72±8.81 min (P<0.001). The proportion of DSUB in the bleeding and non-bleeding group were respectively 37.97%±21.13% and 68.66%±23.99%, indicating a significant association between DSUB and bleeding incidence (P<0.001). The ROC curve analysis indicated a cut-off point of 61% (sensitivity, 64%; specificity, 94%) of submucosal dissection depth associated with bleeding. Therefore, when ESD was performed at a depth of >61% of the submucosal layer, the risk for bleeding during the procedure decreased (PPV, 0.97; 95% CI, 0.85-0.99). CONCLUSION: Improvement in the learning curve in ESD and a better cognitive ability were seen by the third dissection in these short term training courses. And a significant association between DSUB and the risk of bleeding.

scholarly journals More Irrigated Crop Production with Less Water Use

2019 ◽  
pp. 218-226
Author(s):  
Ahmed Ibrahim Ekhmaj ◽  
Younes Daw Ezlit ◽  
Mukhtar Mahmud Elaalem
Keyword(s):  
Crop Yield ◽  
Irrigation Water ◽  
Performance Indicators ◽  
Unit Volume ◽  
Unit Area ◽  
Irrigation Management ◽  
Agricultural Practices ◽  
Common Practices ◽  
The Common ◽  
Production Output

Three major performance indicators developed by the International Water Management Institute (IWMI, 1998) are used in this paper to evaluate the performance of the irrigated crops in the region according to the commonly followed practices among farmers as compared with their performance under conditions of much improved irrigation management and agricultural practices. These indicators include the Standardized Gross Value Production (SGVP), the unit area production output (crop yield or its financial value per hectare) and the unit volume of irrigation water production output (crop yield or its financial value per cubic meter). The comparison between the two agricultural practices indicated that the unit area output of the common practices among farmers did not exceed 6483 Libyan Dinars / hectare, while that under the improved practices was 11605 Libyan Dinars / hectare. The unit volume of irrigation water output for the common practices was 0.63 Libyan Dinar / cubic meter, while that under the improved practices reached 1.63 Libyan Dinar / cubic meter. These results clearly show the importance of the applied performance indicators in the assessment and clarification of the economic impacts of any introduced interventions aiming at the improvement of and/or the differentiation among irrigation management practices and alternative agricultural cropping systems.

Sign in / Sign up

Export Citation Format

Share Document