Evaluation of Tolerance of Some Elemental Impurities on Performance of Pb-Ca-Sn Positive Pole Grids of Lead-Acid Batteries

Abd El-Rahman, H.A.,Gad-Allah, A.G.,Salih, S.A.,Abd El-Wahab, A.M. The Korean Electrochemical Society 2012 Journal of electrochemical science and technology Vol.3 No.3

The electrochemical performance of positive pole grids of lead-acid batteries made of Pb-0.08%Ca-1.1%Sn alloys without and with 0.1 wt% of each of Cu, As or Sb and with 0.1 wt% of Cu, As and Sb combined was investigated by electrochemical methods in 4.0 M $H_2SO_4$. The corrodibility of alloys under open-circuit conditions and constant current charging of the positive pole, the positive pole gassing and the self-discharge of the charged positive pole were studied. All impurities (Cu, As, Sb) were found to decrease the corrosion resistance, $R_{corr}$ after 1/2 hour corrosion, but after 24 hours an improvement in $R_{corr}$ was recorded for Sb containing alloy and the alloy with the three impurities combined. While an individual impurity was found to enhance oxygen evolution reaction, the impurities combined significantly inhibition this reaction and the related water loss problem was improved. Impedance results were found helpful in identification of the species involved in the charging/discharging and the self-discharge of the positive pole. Impurities individually or combined were found to increase the self-discharge during polarization (33-68%), where Sb containing alloy was the worst and impurities combined alloy was the least. The corrosion of the positive pole grid in the constant current charging was found to increase in the presence of impurities by 5-10%. Under open-circuit, the self-discharge of the charged positive grids was found to increase significantly (92-212%) in the presence of impurities, with Sb-containing alloy was the worst. The important result of the study is that the harmful effect of the studied impurities combined was not additive but sometimes lesser than any individual impurity.

Screening thirty soybean genotypes under solid and intercropping plantings in Egypt

Abd El-Alim A. Metwally,Sayed A. Safina,Eman I. Abdel-Wahab,Sherif I. Abdel-Wahab,Tamer I. Abdel-Wahab 한국작물학회 2021 Journal of crop science and biotechnology Vol.24 No.2

Cropping systems are relatively more important for testing soybean genotypes under Egyptian conditions. A field experiment was carried out at the Agricultural Experiments and Research Station, Faculty of Agriculture, Cairo University, Giza, Egypt, during the 2016 and 2017 seasons to evaluate the productivity of thirty soybean genotypes collected from four countries in intercropping with corn. Intercropping two soybean ridges alternating with another two of corn (2:2) was used in a split plot distributed in randomized complete block design. Intercropping and solid systems were randomly assigned to the main plots, and the soybean genotypes were allocated in sub-plots. All over the genotypes, intercropping caused significant increases in maturity date, root length, and plant height; meanwhile, the reverse was true for each of total leaf chlorophyll content, numbers of branches and pods, as well as seed yield per plant. Soybean genotypes Giza 111, C1, Woodworth, C34, Hill, Hutcheson, and Holladay gave higher seed yield than the others. Allover cropping systems, soybean genotypes Giza 111, Woodworth, Hutcheson, and C1 had higher seed yield than the others under intercropping. A significant positive correlation was detected between pod number and seed yield under cropping systems. Early maturing genotypes under intercropping were correlated positively with a higher yield of plants, as well as relative values. Determinate soybean variety Woodworth was matured under intercropping and solid planting at the same time. Soybean genotypes Woodworth, C1, C34, Giza 35, Giza 82, and Giza 111 were tolerant than the others to intercropping. The six soybean genotypes off er useful genetic materials for soybean breeding programs to improve yield under intercropping.

Effect of Phosphoric Acid on the Electronic and Diffusion Properties of the Anodic Passive Layer Formed on Pb-1.7%Sb Grid of Lead-acid Batteries

El-Rahman, H.A. Abd,Salih, S.A.,El-Wahab, A.M. Abd The Korean Electrochemical Society 2011 Journal of electrochemical science and technology Vol.2 No.2

Potentiostatic oxidation of Pb-1.7%Sb alloy used in the manufacture of grids of lead-acid batteries over the potential range from -1.0V to 2.3V in 5M $H_2SO_4$ in the absence and the presence of 0.4M $H_3PO_4$ and the self-discharge characteristics of the oxide layer formed is studied by electrochemical impedance spectroscopy (EIS). Depending on the potential value, sharp variations in resistance and capacitance of the alloy are recorded during the oxidation and they can be used for identification of the various substances involved in passive layer. Addition of $H_3PO_4$ is found to deteriorate the insulating properties of the passive layer by the retardation of the formation of $PbSO_4$. $H_3PO_4$ completely inhibits the current and impedance fluctuations recorded in $H_3PO_4$-free solutions in the potential range 0.5 V-1.7 V. These fluctuations are attributed to the occurrence of competitive redox processes that involve the formation of $PbSO_4$, $PbOSO_4$, PbO and $PbO_2$ and the repeated formation and breakdown of the passive layer. Self-discharge experiments indicate that the amount of $PbO_2$ formed in the presence of $H_3PO_4$ is lesser than in the $H_3PO_4$-free solutions. The start of transformation of $PbSO_4$ into $PbO_2$ is greatly shortened. $H_3PO_4$ facilitates the diffusion process of soluble species through the passive layer ($PbSO_4$ and basic $PbSO_4$) but impedes the diffusion process through $PbO_2$.

Relation of BAALC and ERG Gene Expression with Overall Survival in Acute Myeloid Leukemia Cases

Rashed, Reham A,Kadry, Dalia Y,Taweel, Maha EL,Abd El Wahab, Nahed,Abd El Hameed, Thoreya Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.17

Background: The objectives of this study were to evaluate the expression of brain and acute leukemia, cytoplasmic (BAALC) gene and erythroblast transformation-specific related gene (ERG) in de novo cases of acute myeloid leukemia (AML) and identify roles in disease progression and outcome. Materials and Methods: This study included 50 newly diagnosed AML patients, along with 10 apparently healthy normal controls. BAALC and ERG expression was detected in the bone marrow of both patients and controls using real-time RT-PCR. Results: BAALC and ERG expression was detected in 52% of cases but not in any controls. There was a statistically significant correlation between BAALC and ERG gene expression and age (p-value=0.004 and 0.019, respectively). No statistical significance was noted for sex, lymphadenopathy, hepatomegaly, splenomegaly, other hematological findings, immunophenotyping and FAB sub-classification except for ERG gene and FAB (p-value=0.058). A statistical significant correlation was found between response to treatment with ERG expression (p-value=0.028) and age (p-value=0.014). A statistically significant variation in overall survival was evident with patient age, BM blast cells, FAB subgroups, BAALC and ERG expression (p-value=<0.001, 0.045, 0.041, <0.008 and 0.025 respectively). Conclusions: Our results suggest that BAALC and ERG genes are specific significant molecular markers in AML disease progression, response to treatment and survival.

Feasibility and efficacy of erector spinae plane block versus transversus abdominis plane block in laparoscopic bariatric surgery: a randomized comparative trial

Elshazly Mohamed,EL-Halafawy Yasser Mohamed,Mohamed Dina Zakaria,Wahab Khaled Abd El,Mohamed Tamer Mohamed Kheir 대한마취통증의학회 2022 Korean Journal of Anesthesiology Vol.75 No.6

Background: Overweight and obesity are growing public health concerns worldwide. Bariatric surgery is a modality of weight reduction; however, postoperative pain can increase the length of hospital stay, with all the associated consequences. While regional anesthesia is an available option, the feasibility of performing abdominal wall blocks on patients with obesity is questionable. Methods: Sixty adult patients with a body mass index of 40–50 kg/m2 undergoing laparoscopic bariatric surgery were randomly assigned to receive either an ultrasound-guided transversus abdominis plane (TAP) or erector spinae plane (ESP) block. The primary outcome was the analgesic effect in the first 24 h postoperatively, assessed using the mean visual analog scale (VAS) score. Secondary outcomes were the time required for a successful block, incidence of complications, time to first rescue analgesia, time to flatus or stool passage, and total opioid consumption. Results: The mean VAS score during the first 24 h was higher with the TAP block than with the ESP block (2.78 ± 0.34 vs. 2.32 ± 0.12, P < 0.001). Additionally, the time to first rescue analgesia was greater with the ESP block (P = 0.001) and the time required for a successful block was higher with the TAP block (P = 0.001). However, the incidence of complications, total opioid consumption, and other secondary outcomes was similar between the groups. Conclusions: Compared with the TAP block, the bilateral ESP block is a more feasible and effective method for intra- and postoperative analgesia in patients undergoing laparoscopic bariatric surgery.

Optical and photoelectric properties of TlInS2 layered single crystals

M.M. El-Nahass,A.H.S. Abd Al-Wahab,M.M. Sallam 한국물리학회 2009 Current Applied Physics Vol.9 No.3

Single crystals of the layered compound TlInS2 were grown by direct synthesis of their constituents. The spectral and optical parameters have been determined using spectrophotometric measurements of transmittance and reflectance in the wavelength range 200–2500 nm. Absorption spectra of thin layers of TlInS2 crystals are used to study the energy gap and the interband transitions of the compound in the energy region 2–2.4 eV. The dispersion curve of the refractive index shows an anomalous dispersion in the absorption region and a normal one in the transmitted region. The direct and indirect band gaps were determined to be 2.34 and 2.258 eV, respectively. Photoconductivity measurements at room temperature resolve the structure that can be identified with the optical transition. Single crystals of the layered compound TlInS2 were grown by direct synthesis of their constituents. The spectral and optical parameters have been determined using spectrophotometric measurements of transmittance and reflectance in the wavelength range 200–2500 nm. Absorption spectra of thin layers of TlInS2 crystals are used to study the energy gap and the interband transitions of the compound in the energy region 2–2.4 eV. The dispersion curve of the refractive index shows an anomalous dispersion in the absorption region and a normal one in the transmitted region. The direct and indirect band gaps were determined to be 2.34 and 2.258 eV, respectively. Photoconductivity measurements at room temperature resolve the structure that can be identified with the optical transition.

Promoting the American Senior Tourism to Egypt

Sahar Ibrahim Elkadi,Soha Mohamed Abd el Wahab 세계문화관광학회 2008 Conference Proceedings Vol.9 No.0

Mindful of the global rapid growth in senior tourism, this research aims at studying and evaluating the industry operators' role towards increasing Egypt's market share of the American senior traffic. Within this context, three questionnaire forms were directed to the concerned public and private organizations, and to a random sample of the American seniors in Egypt to stand over the strategies of matching the Egyptian tourism product to the current seniors' wants and expectations. It was concluded that the Egyptian actors must be more senior oriented through advocating innovative approaches to satisfy the American seniors better than the competition.

A Block Encryption Scheme for Secure Still Visual Data based on One-Way Coupled Map Lattice

Alaa Zaghloul,Tiejun Zhang,Handan Hou,Mohamed Amin,Ahmed A. Abd El-Latif,Mohamed S. Abd El-Wahab 보안공학연구지원센터 2014 International Journal of Security and Its Applicat Vol.8 No.4

Cone-beam computed tomography–based radiographic considerations in impacted lower third molars: Think outside the box

Fahd Ali,Temerek Ahmed Talaat,Ellabban Mohamed T,Adam Samar Ahmed Nouby,Shaheen Sarah Diaa Abd El-wahab,Refai Mervat S,Shatat Zein Abdou 대한영상치의학회 2023 Imaging Science in Dentistry Vol.53 No.2

Purpose: This study aimed to evaluate the anatomic circle around the impacted lower third molar to show, document, and correlate essential findings that should be included in the routine radiographic assessment protocol as clinically meaningful factors in overall case evaluation and treatment planning. Materials and Methods: Cone-beam computed tomographic images of impacted lower third molars were selected according to specific inclusion criteria. Impacted teeth were classified according to their position before assessment. The adjacent second molars were assessed for distal caries, distal bone loss, and root resorption. The fourth finding was the presence of a retromolar canal distal to the impaction. Communication with the dentist responsible for each case was done to determine whether these findings were detected or undetected by them before communication. Results: Statistically significant correlations were found between impaction position, distal bone loss, and detected distal caries associated with the adjacent second molar. The greatest percentage of undetected findings was found in the evaluation of distal bone status, followed by missed detection of the retromolar canal. Conclusion: The radiographic assessment protocol for impacted third molars should consider a step-by-step evaluation for second molars, and clinicians should be aware of the high prevalence of second molar affection in horizontal and mesioangular impactions. They also should search for the retromolar canal due to its associated clinical considerations.