Investigation of Local Scour around L-Shape Submerged Groynes in Clearwater Conditions

Submerged Groynes are low profile linear structures that are generally located on the outside bank to form Groynes fields and prevent the erosion of stream banks by redirecting high-velocity flow away from the bank. This research was studied in detail through two major stages. The first stage of the study is based on laboratory experiments to measure the development of local scour around L-shape submerged Groyne with the time, and special attention is given to the effects of different hydraulic and geometric parameters on local scour. Also; maps were drawn showing contour lines that represented the bed levels for maximum scour depth after reaching the equilibrium case. The result showed that a decrease in the scour depth ratio due to the increasing submerged ratio, and the number of Groynes. While the scour hole geometry will increase with the Froude number, flow intensity, and the spacing between Groynes, the decreasing percentage in the scour hole was measured to be about (4.3) % and (4.4) % for decreasing the spacing between Groynes from (2Lg) to (1.5Lg). Besides, it was range about (11.1) % and (14.0) % when reducing the spacing from (1.5Lg) to (Lg) under the same value of maximum Froude number. The second stage of the study is based on experimental results. A new formula was developed by using statistical analysis and it was found that a good determination coefficient.

A validated method for coumarin quantification in Meliloti herba and its ethanolic extracts using micellar thin-layer chromatography

A micellar thin-layer chromatography method for the quantitative determination and validation of coumarin in Meliloti herba and its ethanolic extracts was developed and validated. For achieving good determination, the mobile phase of 5 x 10-4 mol/L Tween-80 in a mixture propanol-2 – water (5:95 v/v) was used. Densitometric determination was carried out at 275 nm. The calibration curve was linear in the range of 0.1-2.5 μg per band. The proposed method is simple, rapid, precise and accurate; replacing hazardous solvents by greener ones correspond to the modern requirements in “Green chemistry” concepts. The obtained data can be used for the routine analysis of coumarin in medical plant and extracts.

Techniques to Push and Withdraw Knowledge on Time to Achieve Performance Beyond Expected: An Analytical Study in the Office of the Ministry of Higher Education and Scientific Research

The study is based on the idea that for a good determination of the techniques adopted in pushing or withdrawing information and knowledge according to the requirements of the type of decisions and according to the appropriate time will lead to achieving a performance that exceeds the ministry's expectations and outside the familiar and the scheme and on that the researcher used the philosophical analysis and preparation of a questionnaire using the Likert pentagon scale and the adoption of descriptive and statistical analysis of the side results Practical, where I found a correlation and influence between the variables of the study, but it is relatively medium in most of its variables to show the ministry's need to support and enhance the capabilities necessary for workers to obtain knowledge at the specified time for the urgent need for them to accomplish the tasks entrusted to them.

SPE-LC/MS/MS Method for Detection of Antidiabetic Contaminants in Municipal and Rural Wastewater

Antidiabetic drugs are among the most prescribed and consumed pharmaceuticals worldwide. Their occurrence in environment was little investigated due of lack of analytcial methods for their detection in waters. In this work has been developed a selective SPE-UHPLC/MS/MS method for isolation, identification and quantification of some antidiabetic compounds. The 3 selected analytes (glyburide, glimepiride and repaglinide) were separated on Eclipse C18 LC column at 300C using isocrat elution with mobile phase of acetonitrile: 0.04% acetic acid (60/40, v/v %). The optimal flow rate was 0.2 mL/min and the injected volum was 10 µL. The contaminants were detected in negative electropray ionization mode (ESI-) by Multiple Reaction Monitoring (MRM). Collision energy, fragmentor voltages were optimized to obtain high sensitivity. Optimization of SPE-LC-MS/MS parameters gave low quantification limit values between 0.27 and 11.1 ng/L. The organic pollutants were isolated from waste water samples on Strata C18 cartridges. The linear regressions were drawn in the interval of 1-100ng/L with good determination coefficients. Spike recovery rates were between 74.5 and 88.2% for waste water, with satisfactory precisions (RSD<15). the method was applied to analyze real influent and effluent of wastewater treatment plant (WWTP) samples. Keywords: antidiabetic contaminants, liquid chromatography-mass spectrometry, wastewater

An Explanation about the Use of (S)-Citronellal as a Chiral Derivatizing Agent (CDA) in 1H and 13C NMR for Sec-Butylamine, Methylbenzylamine, and Amphetamine: A Theoretical-Experimental Study

A chiral derivatizing agent (CDA) with the aldehyde function has been widely used in discriminating chiral amines because of the easy formation of imines under mild conditions. There is a preference for the use of cyclic aldehydes as a CDA since their lower conformational flexibility favors the differentiation of the diastereoisomeric derivatives. In this study, the imines obtained from the reaction between (S)-citronellal and the chiral amines (sec-butylamine, methylbenzylamine, and amphetamine) were analyzed by the nuclear Overhauser effect (NOE). Through NOE, it was possible to observe that the ends of the molecules were close, suggesting a quasi-folded conformation. This conformation was confirmed by theoretical calculations that indicated the London forces and the molecular orbitals as main justifications for this conformation. This conformational locking explains the good separation of 13C NMR signals between the diastereomeric imines obtained and, consequently, a good determination of the enantiomeric excess using the open chain (S)-citronellal as a CDA.

A Dilute-and-Shoot Based UPLC-MS/MS Method for Multimycotoxins Analysis in Astragali radix

Background: Astragali radix is prone to be contaminated by various mycotoxins, leading to unpredictable threats on the quality and safety of Astragali radix and the health of the consumers. Therefore, the determination of multimycotoxins is imperative. Objective: To develop an efficient, sensitive, fast, and multianalyte method for detecting multimycotoxins in Astragali radix. Methods: A selective dilute-and-shoot pretreatment procedure based ultra-performance LC–tandem MS (UPLC-MS/MS) method was developed for sensitive determination of multimycotoxins in Astragali radix, including aflatoxin (AF) B1, B2, G1, G2, and ochratoxin A. The five mycotoxins were extracted by the dilute-and-shoot pretreatment procedure followed by UPLC-MS/MS detection. Types of sample extraction solvent, mobile-phase compositions and MS/MS parameters, and dilute-and-shoot conditions were optimized. Results: The optimized chromatographic and mass spectrometric conditions allowed the separation and detection of the five mycotoxins within 5 min. The validated UPLC-MS/MS method exhibited good sensitivity with LOD and LOQ lower than 0.2 and 0.5 μg/kg, respectively. RSD values for method precision were lower than 9%. Recoveries obtained were between 90.87 and 108.44% for all the analytes with RSDs of 3.96–8.03%. The developed method was applied for the detection of the 5 mycotoxins in 18 batches of Astragali radix with good determination performance and no matrix interferences. Two samples collected from Shanxi province and Neimenggu Autonomous Region in China were positive for AFB1 at 3.24 and 2.69 μg/kg, respectively. Conclusions: The dilute-and-shoot procedure allowed for the extraction of the mycotoxins with advantages of simple pretreatment, small extraction time, high selectivity and accuracy, as well as being cost effective and easy to operate without any clean-up steps. Highlights: This is the first report on dilute-and-shoot approach for mycotoxins extraction and detection in Chinese medicinal material matrixes.

Indikator Kesejahteraan Petani melalui Nilai Tukar Petani (NTP) dan Pembiayaan Syariah sebagai Solusi

<p>As an agricultural country, attention to the welfare of farmers in Indonesia is considered very strategic. One of the measuring tools for farmers’ welfare that is used today is Farmer’s Exchange Rate (FER). This study aims to examine and explore some of the problems with the exchange rate experienced by farmers, including; Farmer’s Exchange Rate (FER) in identifying the welfare of farmers, determining the increase and decrease of Farmer Exchange Rate (FER) in Indonesia; and the potential of Islamic financing in providing solutions for the welfare of farmers. The results show that the increase in FER is not always good. Determination of the increase and decrease rice farmers’ exchange rates are productivity, grain prices, prices of consumer goods, and prices of fertilizers, the exchange rate of farmers on food and nonfood consumption, and production costs. Shariah schemes can be used as a new alternative to help the interest-free and profit-sharing agricultural sector.</p><p>Sebagai negara agraris perhatian terhadap kesejahteraan petani di Indonesia dinilai sangat strategis. Salah satu alat ukur kesejahteraan petani yang digunakan saat ini adalah Nilai Tukar Petani (NTP). Penelitian ini bertujuan untuk mengkaji dan menggali beberapa permasalahan terhadap nilai tukar yang dialami petani, antara lain; Nilai Tukar Petani (NTP) dalam mengindentifikasi kesejahteraan petani, penentu peningkatan dan penurunan Nilai Tukar Petani (NTP) pangan di Indonesia; dan potensi pembiayaan syariah dalam memberikan solusi untuk mensejahterakan petani. Hasil penelitian menunjukkan bahwa Kenaikan NTP tidak selalu baik. Penentu terjadinya kenaikan dan penurunan nilai tukar petani padi adalah produktivitas, harga gabah, harga barang konsumsi, dan harga pupuk, nilai tukar petani terhadap konsumsi makanan dan nonmakanan, serta biaya produksi. Skim syariah dapat dijadikan alternatif baru untuk membantu sektor pertanian yang bebas bunga dan berdasarkan bagi hasil.</p>

Comparative Analysis of Mobile Space Statistics Data and Questionnaire Survey Data to Detect Tsunami Evacuation Behavior: Case of Fukushima Earthquake Tsunami in Ishinomaki City and Watari Town, Miyagi Prefecture

This paper investigates whether it is possible to determine shelter locations and congestion spots at the time of an event, by resorting to the recently anticipated use of mobile space data at the time of a disaster. This study focused on the earthquake and the resulting tsunami that occurred off the coast of Fukushima Prefecture on November 22nd, 2016. We verified whether it is possible to identify congestion spots and shelter locations by comparing with the results of a questionnaire survey conducted in a previous study on evacuation behavior at the time of the occurrence of earthquakes and tsunamis. As a result, we found that it is difficult to determine evacuation behaviors from the data, as raw mobile space data extracted several hours after the tsunami event only gave information on where spots’ populations ordinarily converge to. We were able to determine the locations where populations gather by taking into consideration time-based differences between the raw data obtained. It, however, proved difficult to obtain a good determination of congestion spots.

An Efficient Technique for Three-Dimensional Image Visualization Through Two-Dimensional Images for Medical Data

The main idea behind this work is to present three-dimensional (3D) image visualization through two-dimensional (2D) images that comprise various images. 3D image visualization is one of the essential methods for excerpting data from given pieces. The main goal of this work is to figure out the outlines of the given 3D geometric primitives in each part, and then integrate these outlines or frames to reconstruct 3D geometric primitives. The proposed technique is very useful and can be applied to many kinds of images. The experimental results showed a very good determination of the reconstructing process of 2D images.

Developing a Multidimensional University Student Social Stress Scale

The transition from high school to university can be an especially difficult one for students in the Y or Millennial generation. Over the last several years there has been an increase in reported levels of stress and associated health concerns by students (Bland et al., 2012; Oswalt - Riddock, 2007; Pritchard et al., 2007). As a result, researchers strive to measure stress, and isolate the determinants of stress, however many of the existing inventories are outdated. This study is part of a larger study to develop a Multidimensional Scale which will identify those domains which appear to be the sources of stress for university students. Data was collected from 134 males, and 484 females. The full questionnaire included 127 items in total intending to measure different variables which contribute to university student stress; all questions were measured on a five point Likert scale. Survey items related to social stressors were analyzed using a reliability analysis and a factor analysis in SPSS. Additionally, a confirmatory factor analysis was performed using AMOS. Four factors resulted from this analysis and explained 40.96% of the variance in the scores. They were; peer stress (23.89%), lack of confidence (8.12%), parent stress (5.07%) and romance stress (3.9%). These scores on their own were a good determination of four factors which all serve to contribute to overall student social stress.