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Impact of soil compaction on the engineering properties of potato tubers

International Journal of Agricultural and Biological Engineering 2020年第2期13卷 163-167页

作者： mohamed K.Edrris khalid A.Al-Gaadi Abdalhaleem A.Hassaballa ElKamil Tola khalid A.m.Ahmed Precision Agriculture Research Chair King Saud UniversityRiyadh 11451Saudi Arabia Department of Agricultural Engineering College of Food and Agriculture SciencesKing Saud UniversityRiyadh 11451Saudi Arabia Department of Agricultural&Biological Engineering Faculty of EngineeringKhartoum UniversityKhartoumSudan Chair of Dates Industry and Technology King Saud UniversityRiyadh 11451Saudi Arabia

A study on a 30 hm2 field was conducted to assess the variability in soil compaction and to investigate its effect on the engineering properties of potato tubers in terms of tuber shape and key dimensions(length,width and thickness)and resistance to penetration,rupture and shear *** soil compaction levels were spatially correlated with the engineering properties of potato tubers through linear regression and ANOVA *** three compaction levels included a low level(C1)ranging between 1.2-1.9 mPa,a medium level(C2)with compaction levels between 2.0-2.3 mPa and a high level(C3)ranging between 2.4-2.9 *** revealed that there were no significant changes in the key tuber dimensions corresponding to the variability in soil ***,inverse linear relationships were observed between soil compaction and the key tuber dimensions with R2 values of 77%,97%and 96%for length,width and thickness,***,the soil compaction was shown to have no effect on the tuber resistance to compression and shear *** contrast,the tuber resistance to penetration was significantly affected by soil compaction(p>F=0.0012).

关键词： compaction potato tubers precision agriculture potato engineering properties

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Orange dye polyaniline composite based impedance humidity sensors

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Chinese Physics B 2013年第1期22卷 161-166页

作者： muhammad Tariq Saeed Chani Kh. S. Karimov F. A. khalid S. Z. Abbas m. B. Bhatty GIK Institute of Engineering Sciences and Technology Topi 23640 Khyber Pakhtunkhwa Pakistan Center of Excellence for Advanced materials Research (CEAmR) King Abdulaziz University Jeddah 21589 P.O. Box 80203 Saudi Arabia Physical Technical Institute Aini St. 299/1 Dushanbe 734063 Tajikistan

This study presents the fabrication and investigation （PANI） composite films. A blend of 3 wt.% od with 1 of humidity sensors based on orange dye （od） and polyaniline wt.% PANI was prepared in 1 ml water. The composite films were deposited on glass substrates between pre-deposited silver electrodes. The gap between the electrodes was 45 um. The sensing mechanism was based on the impedance and capacitance variations due to the absorption/desorption of water vapor. It was observed that with the increase in relative humidity （RH） from 30% to 90%, the impedance decreases by 5.2 × 10^4 and 8.8 × 10^3 times for the frequencies of 120 Hz and 1 kHz, respectively. The impedance-humidity relationship showed a more uniform change compared to the capacitance-humidity relationship in the RH range of 30% to 90%. The consequence of annealing, measuring frequency, response and recovery time, and absorption-desorption behavior of the humidity sensor were also discussed in detail. The annealing resulted in an increase in sensitivity of up to 2.5 times, while the measured response time and recovery time were 34 s and 450 s, respectively. The impedance-humidity relationship was simulated.

关键词： organic-organic composite humidity sensor polyaniline orange dye

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The Effect of media on Biomass and Oil Production in Botryococcus braunii Strains Kossou-4 and Overjuyo-3

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International Journal of Clean Coal and Energy 2015年第1期4卷 11-22页

作者： khalid A. Al-Hothaly Aidyn mouradov Abdulatif A. mansur Brian H. may Andrew S. Ball Eric m. Adetutu School of Applied Sciences RMIT University Bundoora Australia Department of Biotechnology Faculty of Science Taif University Taif Kingdom of Saudi Arabia Department of Environmental and Natural Resources Engineering Faculty of Engineering Azawia University Azawia Libya School of Health Sciences RMIT University Bundoora Australia

The green algae Botryococcus braunii is widely recognized as a source of oil, including hydrocarbons. However, the slow rate of growth B. braunii hampers its commercial development. This stu- dy addresses this by examining the effects of three growth media on biomass and oil production in two B. braunii Race B strains, Kossou-4 and Overjuyo-3. Growth of B. braunii strains in BG11 medium resulted in significantly higher growth (2.3 - 4.2 and 2.9 - 6.0 fold increases in Kossou-4 and Overjuyo-3 respectively) compared to the Jm and BBm-3N media after 15 days. A similar trend was obtained when biomass was measured indirectly using optical density (od) and chlorophyll fluo-rescence. Oil production was also significantly higher in BG11 whether measured as oil weight or absorbance (ods at 680 and 750 nm). However, the presence of extracellular oil was shown to in-crease absorbance values making od measurements less reliable than dry weight assays. maximum recovery of oil was recorded when hexane was used as solvent compared to hexane-isopro- panol and heptane. These results suggest that BG11 is the best growth medium for these two strains under the conditions of this experiment.

关键词： B. braunii Race B media Biomass Oil Production

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DFT investigation of half-metallic ferromagnetic rare earth based spinels mgHo_(2)Z_(4)(Z=S,Se)

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Journal of Rare Earths 2024年第1期42卷 121-128,I0005页

作者： maiza Zanib mumtaz manzoor N.A.Noor m.Waqas Iqbal mazia Asghar H.H.Hegazy A.Laref Department of Physics Riphah International UniversityLahore CampusPakistan Research Centre for Advanced materials Science King Khalid UniversityP.O.Box 9004AbhaSaudi Arabia Department of Physics Faculty of ScienceKing Khalid UniversityP.O.Box 9004AbhaSaudi Arabia Department of Physics and Astronomy College of ScienceKing Saud UniversityRiyadh11451Saudi Arabia

Half-metallic ferromagnetism,mechanical as well as thermoelectric properties for rare earth-based spinels mgHo_(2)Z_(4)(Z=S,Se)were investigated using density functional theory(DFT).Structural optimization was done with Perdew-Burke-Ehrenzorf(PBE)sol-generalized gradient approximation(GGA)to calculate the lattice constant of both spinels comparable to experimental *** addition,Born stability criteria and negative formation energy show that our studied spinels are also structurally and dynamically stable in the cubic *** ferromagnetic(Fm)state stability,we also calculated the energy differences among Fm,antiferromagnetic(AFm),and non-magnetic(Nm)***,Curie temperatures of ferromagnetic phases were also *** used Trans-Blaha improved BeckeJohnson(TB-mBJ)potential functional for electronics as well as magnetic characteristics,which lead to the consistent explanation of half-metallic ferromagnetism,representing the whole band-occupancy in material with exact detail of density of states(DOS).The stable Fm state was examined in spinels due to the exchange splitting of Ho cation consisting of p-d hybridizations compatible with the result achieved for electronics band structure and ***,spin magnetic moment was explained in terms of anion,cation,and sharing charge on studied *** addition,the calculated thermoelectric properties clearly show that operation range of these systems may be utilized by future experimental works for identifying the potential applications of these systems.

关键词： Ho-based spinels DFT simulations mechanical parameters Electronic properties hm ferromagnetism Figure of merit

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土壤压实度对马铃薯块茎工程性能的影响

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农业工程技术 2020年第24期 86-86页

作者： mohamed K.Edrris khalid A.Al-Gaadi Abdalhaleem A.Hassaballa El Kamil Tola khalid A.m.Ahmed Precision Agriculture Research Chair King Saud University Department of Agricultural Engineering College of Food and Agriculture Sciences King Saud University Department of Agricultural & Biological Engineering Faculty of Engineering Khartoum University Chair of Dates Industry and Technology King Saud University

在30hm;的场地上评估土壤压实度的变异性,并研究了其对马铃薯块茎形状和关键尺度（长度、宽度和厚度）的工程特性以及贯入阻力、破裂和剪切性能的影响。通过线性回归和ANOVA测试,研究了3种土壤压实度与马铃薯块茎工程性状的空间相关性... 详细信息

在30hm;的场地上评估土壤压实度的变异性,并研究了其对马铃薯块茎形状和关键尺度（长度、宽度和厚度）的工程特性以及贯入阻力、破裂和剪切性能的影响。通过线性回归和ANOVA测试,研究了3种土壤压实度与马铃薯块茎工程性状的空间相关性。三个压实度分别包括介于1.2-1.9mPa之间的较低等级（C1）,介于2.0-2.3mPa之间的中等等级（C2）,和介于2.4-2.9mPa之间的较高等级（C3）。结果表明,关键块茎尺寸并没有因土壤压实度的变异性而发生显著变化。然而,土壤压实度与长、宽、厚的关键块茎尺寸之间存在R2值分别为77%、97%和96%的负线性关系。同样地,土壤压实度对块茎抗压缩和剪切力性能没有影响。相比之下,块茎抗渗透力受到土壤压实（p>F=0.0012）的影响显著。

关键词：压实度马铃薯块茎精准农业马铃薯工程性能

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