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Evidence for distortion-induced local electric polarization in α-RuCl3

Science China(Physics,Mechanics & Astronomy) 2024年第9期Mechanics & Astronomy) .卷 169-177页

作者： Xinrun Mi De Hou Xiao Wang sabreen hammouda Caixing Liu Zijian Xiong Han Li Yan Liu Guiwen Wang Aifeng Wang Yisheng Chai Yang Qi Wei Li Xiaoyuan Zhou Yixi Su D.I.Khomskii Mingquan He Zhigao Sheng Young Sun College of Physics Center of Quantum Materials and DevicesChongqing University Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field LaboratoryHefei Institutes of Physical ScienceAnhuiChinese Academy of Sciences University of Science and Technology of China Jülich Centre for Neutron Scienceat Heinz Maier-Leibnitz Zentrum(JCNS-MLZ) Forschungszentrum Jülich GmbH School of Physics Beihang University Analytical and Testing Center Chongqing University State Key Laboratory of Surface Physics Department of PhysicsFudan University CAS Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of Sciences Ⅱ.Physikalisches Institut Universit?t zu K?ln

The spin-orbit assisted Mott insulator α-RuCl3is a prime candidate for material realization of the Kitaev quantum spin *** little attention has been paid to charge degrees of freedom, charge effects, such as electric polarization, may arise in this system. Here, we report distortion-induced local electric polarization in α-RuCl3as evidenced by single-crystal X-ray diffraction,second harmonic generation（SHG） and dielectric measurements. The SHG signal appears at room temperature and develops substantially in the Kitaev paramagnetic state when short-range spin correlations come into play. Despite sizable pyroelectric currents in the Kitaev paramagnetic state, the absence of hysteresis in the polarization-electric field（P-E） points to the shortrange nature of electric polarization. This localized electric polarization is likely the result of distortion-induced charge dimerization, achieved through virtual hopping-induced charge redistribution. In addition, the electric polarization is boosted by short-range spin correlations via spin-phonon coupling in the Kitaev paramagnetic state. Our results emphasize the importance of charge degrees of freedom in α-RuCl3, which establish a novel platform to investigate charge effects in Kitaev materials.

关键词： Mott insulator Kitaev quantum spin liquid electric polarization

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Evidence for distortion-induced local electric polarization in α-RuCl

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Science China(Physics,Mechanics & Astronomy) 2024年

作者： Xinrun Mi De Hou Xiao Wang sabreen hammouda Caixing Liu Zijian Xiong Han Li Yan Liu Guiwen Wang Aifeng Wang Yisheng Chai Yang Qi Wei Li Xiaoyuan Zhou Yixi Su D.I.Khomskii Mingquan He Zhigao Sheng Young Sun College of Physics Center of Quantum Materials and Devices Chongqing University Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field Laboratory Hefei Institutes of Physical Science Anhui Chinese Academy of Sciences University of Science and Technology of China Jülich Centre for Neutron Scienceat Heinz Maier-Leibnitz Zentrum (JCNS-MLZ) Forschungszentrum Jülich GmbH School of Physics Beihang University Analytical and Testing Center Chongqing University State Key Laboratory of Surface Physics Department of Physics Fudan University CAS Key Laboratory of Theoretical Physics Institute of Theoretical Physics Chinese Academy of Sciences II.Physikalisches Institut Universit?t zu K?ln

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Hematobiochemical and histopathological alterations in Nile Tilapia(Oreochromis niloticus)exposed to ethidium bromide:The protective role of Spirulina platensis

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Aquaculture and Fisheries 2024年第1期9卷 93-103页

作者： sabreen Abdullah Mervat Naguib Alaa El-Din Salah El-Din Alaa El-Din H.Sayed Zoology Department Faculty of ScienceAswan UniversityAswan81528Egypt Zoology Department Faculty of ScienceAssuit UniversityAssiut71516Egypt

Ethidium bromide(EtBr)is one of the contaminants recorded in aquatic environments whose effects have been investigated;however,there is still limited knowledge about its *** study examined the potential protective effects of Spirulina platensis(SP)against the effects of EtBr toxicity in the Nile tilapia(Oreochromis niloticus)*** were divided to five groups,viz.,a control and four treatment groups of low-dose EtBr(10μg/L),low-dose EtBr with SP(10μg/L EtBr+200 mg/L SP),high-dose EtBr(100μg/L),and high-dose EtBr with SP(100μg/L EtBr+200 mg/L SP);the exposure period was 2 *** and high doses of EtBr induced alterations in some hematological,biochemical,and histopathological *** hepatocytes,degenerated area,vacuolated hepatocytes,pyknotic nuclei,constricted and dilated blood sinusoids,and infiltration of inflammatory cells were *** peroxidation concentration was not significantly different in groups exposed to low doses of EtBr and EtBr with SP,but it was increased in groups exposed to high doses of EtBr and EtBr with SP,compared with the control *** feeding with SP,most histological and histochemical parameters restored to normal ***,SP may possess the ability to preserve the structural integrity of the hepatic and renal membranes.

关键词： Ethidium bromide Spirulina platensis Oreochromis niloticus Liver Lipid peroxidation

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Do High-Magnesium Cool-Season Grasses Contemplate Grass Tetany Risk?

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Open Journal of Soil Science 2022年第4期12卷 97-118页

作者： Shamima sabreen Suguru Saiga Rafiq Islam Hasinur Rahman The United Graduate School of Agricultural Sciences Iwate University Morioka Japan Department of Plant Production Faculty of Agriculture Iwate University Morioka Japan Soil Water and Bioenergy Resources The Ohio State University South Centers Piketon OH USA Department of Soil and Environmental Sciences The University of Barishal Barishal Bangladesh

Economic losses associated with grass tetany either of death or poor growth performance of livestock are a growing concern. Breeding of high magnesium (high-Mg) cool-season forage grass (C3) has been a challenging process to minimize the hazards of grass tetany. For appraising the breeding of high Mg-containing cultivars in Japanese Andisol, agronomic properties and grass tetany risk of high-Mg cultivars were compared with commercial cultivars. The high-Mg cultivars of Italian ryegrass (Lolium multiflorum L.), tall fescue (Festuca arundinacea Schreb.), and orchardgrass (Dactylis glomerata L.) were “Magnet”, “HiMag” and “Mgwell”, respectively. The commercial cultivars were viz., Ace, Tachiwase, and Waseyutaka of Italian ryegrass, Hokuryo, Kentucky-31 (Ky-31), and Fawn of tall fescue, and Akimidori and Okamidori of orchardgrass, respectively. Grasses were grown in temperate Andisol under field conditions with standard management practices and were harvested four times during the year. The average plant heights of the high-Mg containing cultivars were lower than the commercial cultivars with the relative range of −7.4%, −3.7%, and −1.5% for Italian ryegrass, tall fescue, and orchard grass species, respectively. The seasonal yield of high-Mg cultivars was ranked as Magnet > HiMag > Mgwell. The Mgwell orchard grass had lower potassium (K) content compared with their respective commercial cultivars with a relative range of −2.2%. Across four harvests, a significantly higher calcium (Ca) and magnesium (Mg) content, and lower grass tetany potential were recorded in high-Mg cultivars when compared to commercial cultivars, irrespective of species. Across four harvests, the lowest grass tetany index, [K/(Ca + Mg)] of 1.36 was recorded in Mgwell orchard grass. The high-Mg cultivars showed the lowest [K/(Ca + Mg)] across four harvests compared to commercial cultivars, promoting the effectiveness of breeding cool-season grass species to control

关键词： Andisol Temperate Italian Ryegrass Tall Fescue Orchardgrass

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Effect of drip irrigation method, nitrogen source, and flushing schedule on emitter clogging

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Agricultural Sciences 2013年第3期4卷 131-137页

作者： Mohamed Yousif Tayel sabreen Khalil Pibars Hani Abdel-Ghani Mansour Water Relation and Field Irrigation Department National Research Center Giza Egypt

Field experiments were carried out at the National Research Center farm, Nubaria area, Behura Governorate, Egypt, to study the effect of nitrogen source, flushing schedule and irrigation method on emitter clogging. Peanut Giza 5 variety (Arachishy pogaea L.) was planted in sandy soil during two successive growing seasons (2010-2011) in the 1st week of May and harvested after 130 days. Treatments used are: 1) two irrigation methods: surface drip irrigation and sub-surface drip irrigation (SDI;SSDI), 2) nitrogen source (NS):NH4NO3, (NH4)2SO4 and Ca(NO3)2 (NS1, NS2 and NS3) and 3) flushing number (FL) 0, 1 and 4 (FL1, FL2;FL3). The experiments design was split-split plot and three replicates were used. Data obtained were subjected to statistical analysis. The main effects of treatments used on clogging per cent could be written the following ascending orders: SDI 3 2 1, NS1 2 3. Concerning the 1st interaction the following ascending orders denote their effects on clogging percent: SDI × FL3 2 1, SDI × NS1 2 3, SSDI × FL3 2 1, SSDI × NS1 2 3, FL1 × NS1 1 × NS2 1 × NS3, FL2 × NS1 2 × NS2 2 × NS3 and FL3 × NS1 3 × NS2 3 × NS3. The differences between any two treatments and/or any two interactions in clogging percent were significant at the 5% level. The effect of the 2nd interaction on clogging percent was significant at the 5% level. The maximum value of clogging (20.18%) and the lowest one (3.9%) were archived in the interactions: SSDI × FL1 × NS3 and SDI × FL3 × NS1, respectively.

关键词： Irrigation Method Nitrogen Source Flushing Number Water and Soil Analysis Emitter Clogging

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Effect of closed circuits drip irrigation system and lateral lines length on growth, yield, quality and water use efficiency of soybean crop

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Agricultural Sciences 2013年第2期4卷 85-90页

作者： Mohamed Yousif Tayel Hani Abdel-Ghani Mansour sabreen Khalil Pibars Water Relation and Field Irrigation Department National Research Center Giza Egypt

Field experiment was conducted for one growing season (2012) in clay loam soil at the Experimental Farm of Faculty of Agriculture, Southern Illinois University at Carbondale (SIUC), USA on soybean crop to study the effect of: 1) the closed drip irrigation system: closed circuits with one and two a manifolds for lateral lines (CM1DIS;CM2DIS) and traditional drip irrigation system (TDIS) as a control;and 2) lateral lines length (LLL): LLL1, LLL2 and LLL3 (40, 60,80 m) on soybean growth, yield, oil, protein content and water use efficiency. Plants were drip irrigated every 4 days. N, K2O and P2O5 fertilizers were added via irrigation water. Data obtained could be outlined as follows: 1) According to the mean values of soybean crop growth (leaf area;plant height), yield (grain and straw), both oil and protein content and water use efficiency, the treatment used could be ranked in the following ascending orders: TDIS < CM1DIS < CM2DIS and LLL3 < LLL2 < LLL1;2) Differences in the means of the studied data among treatments used were significant at the 1% level;3) The effects of the DIC × LLL on the data obtained were significant at the 1 % level;And 4) the highest values of the obtained data and the lowest ones were achieved in the following interactions: CM2DIS × LLL1;TDIS × LLL3, respectively.

关键词： Closed Circuits Drip Irrigation Lateral Lines Soybean WUE

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The Effect of Gold Salt Concentration in the Production of Gold Nanospheres

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Journal of Applied Mathematics and Physics 2020年第8期8卷 148-1495页

作者： sabreen Juda Badi Emad K. Al-Shakarchi Shyma’a Jamal Ahmed Physics Department College of Science Al-Nahrain University Baghdad Iraq College of Medicine University of Baghdad Baghdad Iraq

The optical, electrical and chemical properties of the gold nanospheres synthesized by different gold concentrations in deionized water through a simple chemical reduction method (Turkevich method) were studied. They were dependent on the variation of the gold salt concentration. The peaks of the surface Plasmon resonance (SPR) absorption band and their wavelengths were detected by a UV-visible spectrophotometer. The diameters of the spherical gold nanoparticles were measured theoretically using UV-visible absorption spectrum analysis of the synthesized gold nanoparticles in colloidal form by calculating the ratio of the absorbance at the surface Plasmon resonance (SPR) peak to the absorbance at the lowest peak closed to SPR peak. The values of the gold nanoparticles diameters were (23 nm) and decreased to (13 nm) as the function of molarity changed in the range (0.1 - 0.3 mM). They were compared with the results of the transmission electron microscopy (TEM), which was about (15 - 20 nm) measured by the reference images of Sigma-Aldrich values. The conductivity measurements showed increasing the conductivity with molarity increased. The total dissolved solids (TDS) exhibited increase by linear relation with molarity increasing. The pH-value of the gold nanoparticles solutions varied with the molarity and recorded a bowing value of pH-value at (0.2 mM).

关键词： Gold Nanoparticles Turkevich Method Surface Plasmon Resonance Total Dissolved Solids Conductivity Measurements

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Environmentally Friendly Biosorbent from Moringa Oleifera Leaves for Water Treatment

Environmentally Friendly Biosorbent from Moringa Oleifera Le...

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作者： Eman N.Ali sabreen R.Alfarra Mashita Mohd Yusoff Md Lutfor Rahman the Faculty of Chemical&Natural Resources Engineering Universiti Malaysia Pahang Universiti Malaysia Pahang the Faculty of Industrial Sciences&Technology Universiti Malaysia Pahang

In this study Moringa oleifera leaves(biosorbent) is used for Cadmium(Ⅱ) removal from water as a natural alternative for synthetic *** water was used to find optimum conditions for water treatment using *** effect of biosorbent dosage and particle size, contact time, and pH effect were *** Absorption Spectroscopy(AAS) was used to monitor the Cd(Ⅱ) concentration before and after treatment with *** Transform Infrared Spectroscopy(FTIR) was used to monitor biosorbent structure changes before and after loading with Cd(Ⅱ).Many parameters were studied such as: dosage of biosorbent(1 – 10 g/L), contact time(2 – 20 min), particle size(2 mm, 1 mm, 500 μm, 250 μm, and <250 μm), pH range(4-10), and Cd(Ⅱ) concentrations(1, 3, 5, and 7 ppm).The statistical analysis of studied parameters showed that all parameters has an effect on Cd(Ⅱ) removal with p values <0.05 except *** result showed changes in the finger print area of biosorbent functional groups due to adsorption of Cd(Ⅱ).As a conclusion, Moringa oleifera leaves can be used as an effective, low cost, and environmentally friendly biosorbent for the removal of Cd(Ⅱ) from water.

关键词： Biosorption Cadmium(Ⅱ) Moringa oleifera water treatment

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Snugger method-The Oldenburg modification of perceval implantation technique

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World Journal of Cardiology 2018年第9期10卷 119-122页

作者： Ahmed Mashhour Konstantin Zhigalov Marcin Szczechowicz sabreen Mkalaluh Jerry Easo Harald Eichstaedt Dmitry Borodin Jürgen Ennker Alexander Weymann Department of Cardiac Surgery European Medical School Oldenburg-Groningen Carl von Ossietzky University Oldenburg

We present a modified implantation technique of the Perceval~? sutureless aortic valve(LivaNova, London, United Kingdom) that involves the usage of snuggers for the guiding sutures during valve deployment. Both limbs of each guiding suture are pulled through an elastic tube, which is fixed with a Pean clamp, which tightens the sutures and fixes the prosthesis to the aortic annulus during valve deployment. This method proved safe and useful in over 120 cases. Valve implantation was facilitated and the need for manipulation by the assistant or the nurse was eliminated.

关键词： Aortic valve Surgical Perceval Snugger Sutureless aortic valve

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