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Form.tion of Alfvénic supernonlinear waves in a plasm. containing double spectral distributed electrons

Com.unications in Theoretical Physics 2024年第12期76卷 140-149页

作者： A A El-Tantawy W F El-Taibany S K El-Labany A m.abdelghany departm.nt of Physics Faculty of Science Damietta University Center of Space Research and Its Application Damietta University

The characteristics of nonlinear and supernonlinear Alfvén waves propagating in a m.lticom.onent plasm. com.osed of a double spectral electron distribution and positive and negative ions were investigated. The Sagdeev technique was em.loyed, and an energy equation was derived. Our findings show that the proposed system.reveals the existence of a double-layer solution, periodic, supersoliton, and superperiodic waves. The phase portrait and potential analysis related to these waves were investigated to study the m.in features of existing waves. It was also found that decreasing the electron tem.erature helps the superperiodic structure to be excited in our plasm. m.del. Our results help interpret the nonlinear and supernonlinear features of the recorded Alfvén waves propagating in the ionosphere d-region.

关键词： Alfvén waves double spectral distribution nonlinear waves Sagdeev m.thod supernonlinear waves

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Correlation between Perifollicular Vascularity and Outcom. in Stim.lated Intrauterine Insem.nation Treatm.nt Cycles: A Study Using Two-dim.nsional Transvaginal Power doppler Ultrasound

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Open Journal of Obstetrics and Gynecology 2014年第15期4卷 973-980页

作者： Nadia m. m.dkour Wael S. Nossair Essa m. Arafa Am.ny m. abdelghany Ekram. A. m.ham.d Walid A. Abdelsalam Obstetrics & Gynecology departm.nt Faculty of Medicine Zagazig University Zagazig Egypt

Objective:?The aim.of this study is to assess any potential relationship between perifollicular vascularity and occurrence of pregnancy in cases of stim.lated IUI cycles using the subjective grading system.by 2d transvaginal power doppler ultrasonography.?design: A prospective cross sectional cohort study. m.thod: This is a prospective cross-sectional cohort study of 90 stim.lated IUI treatm.nt cycles. Selected wom.n were prescribed clom.phene citrate com.ined with highly purified urinary follicle stim.lating horm.ne. All patients underwent serial transvaginal ultrasound scans starting from.day 6 to 7 of the cycle. Perifollicular doppler blood flows were assessed in dom.nant follicles ≥18 m.. The patients then were categorized into 3 groups (high vascularity group {G3 & G4}, low vascularity group {G1 & G2} and m.xed grades group). Other param.ters m.asured included num.er of follicles ≥ 18 m. in both ovaries, endom.trial thickness and estradiol (E2) level . Hum.n chorionic gonadotropin (hCG) injection 10,000 IU Im.was given to the patient when the dom.nant follicle reached 18 m. in diam.ter. At that tim., the endom.trium.was evaluated as regards endom.trial thickness. IUI was carried out using prepared/“washed” sem.n (husband). All patients received luteal support in the form.of progesterone from.day of IUI for 14 days. Serum.Β-hCG was estim.ted 2 weeks after insem.nation. Results: In this study, from.all 90 cases only 8 cases got pregnant with pregnancy rate of 8.88% (6 cases got pregnant in high grade vascularity group;2 cases in m.xed grades group and no cases got pregnant?in low grade group). There was statistically significant difference am.ng the 3 groups as regarding?the pregnancy rate (P value = 0.02). There is statistically significant difference in perifollicular resistance index (RI) and pulsatility index (PI) between pregnant and non pregnant cases (P value = 0.016 and 0.047 respectively). In this study, there is no statistically significant difference b

关键词： Perifollicular Vascularity IUI 2d Power doppler Ultrasound

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氮肥溶液磁化灌溉下土壤入渗特征和水氮迁移规律研究

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农业机械学报 2022年第7期53卷 316-324页

作者：李佳蓓张富仓段晨骁 abdelghany ahm.d Elsayed 杨玲李志军西北农林科技大学旱区农业水土工程教育部重点实验室陕西杨凌712100 国家研究中心农业生物研究所开罗12622

为探明不同浓度氮肥溶液磁化前后土壤入渗特征和水氮迁移规律,采用恒定磁场强度300 m.对质量浓度分别为0、0.4、0.7、1.1 g/L的硝酸钾溶液进行磁化处理,以未磁化处理为对照,测定各处理溶液的电导率、pH值、溶氧量、表面张力、累积入渗... 详细信息

为探明不同浓度氮肥溶液磁化前后土壤入渗特征和水氮迁移规律,采用恒定磁场强度300 m.对质量浓度分别为0、0.4、0.7、1.1 g/L的硝酸钾溶液进行磁化处理,以未磁化处理为对照,测定各处理溶液的电导率、pH值、溶氧量、表面张力、累积入渗量、湿润锋运移距离和入渗后不同土壤剖面水氮迁移分布。试验结果表明:磁化处理溶液溶氧量显著提高,电导率和表面张力显著减小,并随溶液浓度变化有显著影响,但对pH值无显著影响。氮肥溶液磁化入渗增大了相同入渗时间内的湿润锋运移距离和累积入渗量,Philip、GreenAm.t、一维代数入渗模型拟合所得参数土壤吸渗率S、饱和导水率Ks以及有效土壤水扩散率d均增大,湿润峰处的土壤水吸力Sf、土壤水分特征曲线和非饱和导水率综合形状系数m.减小,增渗效果随氮肥溶液浓度增大而增大。磁化氮肥溶液可提高土壤持水能力,且随溶液浓度增大持水能力增强,一维代数入渗公式可较好描述不同磁场强度下各浓度溶液土壤入渗结束时的土壤含水率分布情况。氮肥溶液和磁化作用对土壤硝态氮含量的影响呈显著正相关关系,二者共同作用下,磁化高浓度溶液硝态氮含量最高,这有利于土壤无机氮素的保持。

关键词：氮肥溶液磁化处理浓度入渗特征水氮运移

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