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Structural behavior of intermediate length cold-formed steel rack columns with C-stitches

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Frontiers of Structural and Civil Engineering 2019年第4期13卷 937-949页

作者： M. ANBARASU Mahmud ashraf Department of Civil Engineering Government College of Engineering Salem 636011 India School of Engineering Deakin University Geelong VIC 3216 Australia

This article presents an experimental and numerical investigation on the strength and performance of intermediate length rack column sections with C-stitches under axial compression. The test program consisted of 10 axial concentric compression tests on columns with and without C-stitches under pin end conditions for two different geometric lengths. Finite element (FE) models were developed using commercial FE package ABAQUS considering material and geometric nonlinearities as well as initial geometric imperfections. The elastic buckling properties of the section were calculated using readily available linear elastic buckling analysis tools based on Generalized Beam Theory (GBT) and Finite Strip Method (FSM). Obtained FE results were compared with those obtained experimentally, and once verified the developed FE modeling technique was used to carry out a parametric study to examine changes in structural response due to variations in length, depth and spacing of C-stitches. Observed influences of C-stitches on the behavior and resistance of the considered columns were carefully analyzed, and key design aspects are presented herein.

关键词： cold-formed steel columns C-stitches intermediate length columns distortional buckling

Sesamol Alleviates the Cytotoxic Effect of Cyclophosphamide on Normal Human Lung WI-38 Cells via Suppressing RAGE/NF-κB/Autophagy Signaling

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Natural Products and Bioprospecting 2021年第3期11卷 333-343页

作者： Soad Z.El-emam Department of Pharmacology and Toxicology Faculty of PharmacyOctober 6 University6 October CityGiza 12566Egypt

Cyclophosphamide(CYL)is a chemotherapeutic medication commonly used in managing various malignancies like breast cancer or ***,CYL has been documented to induce lung *** of CYL toxicity is through oxidative stress and the release of damage-associated molecular patterns(DAMPs).Sesamol(SES)is a natural antioxidant isolated from Sesamum indicum and its effect against CYL-induced lung toxicity is not studied *** study aims to inves-tigate whether SES could prevent any deleterious effects induced by CYL on lung using normal human lung cells,WI-38 cell line,without suppressing its *** were pretreated with SES and/or CYL for 24 h,then cell viability was estimated by MTS and trypan blue *** mode of cell death was determined by AO/EB ***,caspase-3 level,oxidative stress,and inflammatory markers were evaluated by colorimetric and ELISA ***-PCR was performed to evaluate RAGE,NF-κB,and Beclin-1 ***-treated WI-38 cells developed a significantly increased cell death with enhanced oxidative and RAGE/NF-κb/Autophagy signaling,which were all attenuated after pretreatment with ***,we concluded that SES offered a protective role against CYL-induced lung injury via suppressing oxidative stress and RAGE/NF-κB/Autophagy signaling,which is a natural safe therapeutic option against CYL toxicities.

关键词： Cyclophosphamide Sesamol Lung toxicity Autophagy Oxidative stress RAGE

Presowing Seed Treatment with Cytokinins and Its Effect on Growth, Photosynthetic Rate, Ionic Levels and Yield of Two Wheat Cultivars Differing in Salt Tolerance

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Journal of Integrative Plant Biology 2005年第11期47卷 1315-1325页

作者： Muhammad IQBAL Muhammad ashraf Department of Botany University of Agriculture Faisalabad 38040 Pakistan

The effects of presowing seed treatment with different concentrations of cytokinins （kinetin and benzylaminopurine; 100, 150, and 200 mg/L） on growth, photosynthetic capacity, and ion homeostasis were investigated in two spring wheat （Triticum aestivum L.） cultivars, namely MH-97 （salt sensitive） and Inqlab- 91 （salt tolerant）. Primed and non-primed seeds were sown in a field in which NaC1 salinity of 15 dS/m was developed. Of the different concentrations of priming agents tested, the effect of a moderate concentration of kinetin （150 mg/L） was very pronounced, particularly in improving growth and grain yield, in both cultivars. In addition, priming with kinetin alleviated the adverse effect of salt stress on gaseous exchange characteristics （net CO2 assimilation rate and water use efficiency） in both cultivars. Seed priming with a moderate concentration of kinetin also altered the pattern of accumulation of Na^＋ and Clˉ in the shoots, irrespective of the wheat cultivar, under conditions of salt stress. However, all other priming agents at the different concentrations tested did not show any consistent effect on ion levels, except hydropriming, which increased K^＋ levels in the shoots of both cultivars under salt stress. In conclusion, a moderate concentration of kinetin showed a consistent effect in altering the growth and grain yield of both wheat cultivars, which was related to the beneficial effects of kinetin priming on water use efficiency and photosynthetic rate under conditions of salt stress.

关键词： growth hormonal priming photosynthesis pre-treatment salt stress yield.

Seed Treatment with Auxins Modulates Growth and Ion Partitioning in Salt-stressed Wheat Plants

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Journal of Integrative Plant Biology 2007年第7期49卷 1003-1015页

作者： Muhammad lqbal Muhammad ashraf Department of Botany University of Agriculture Faisalabad 38040 Pakistan

Experiments were performed to determine whether seed priming with different concentrations （100, 150, and 200 mg/L） of auxins （indoleacetic acid （IAA）, indolebutyric acid （IBA）, or their precursor tryptophane （Trp）） could alter salinity induced perturbances in salicylic acid and ion concentrations and, hence, growth in wheat （Triticum aestivum L.） cultivars, namely M.H.-97 （salt intolerant） and tnqtab-91 （salt tolerant）. Primed and non-primed seeds were sown in Petri dishes in a growth room, as well as in a field treated with 15 dS/m NaCl salinity. All priming agents, except IBA, increased the final germination percentage in both cultivars. The seedlings of either cultivar raised from Trp-treated seeds had greater dry biomass when under salt stress. In field experiments, Trp priming was much more effective in mediating the increase in grain yield, irrespective of the cultivar, under salt stress. The alleviatory effect of Trp was found to be associated with reduced uptake of Na^＋ in the roots and subsequent translocation to the shoots, as well as increased partitioning of Ca^＋ in the roots of salt-stressed wheat plants. Plants of both cultivars raised from Trp-and IAA-treated seeds accumulated free salicylic acid in their leaves when under salt stress. Overall, the Trp priming-induced improvement in germination and the subsequent growth of wheat plants could be related to ion homeostasis when under salt stress. The possible involvement of salicylic acid in the Trp priming-induced better growth under Conditions of salt stress is discussed.

关键词： auxins growth ion homeostasis salicylic acid seed priming tryptophane wheat.

Evaluation of glacial resource potential for sustaining kuhl irrigation system under changing climate in the Himalayan region

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Journal of Mountain Science 2019年第5期16卷 1150-1159页

作者： Arshad ashraf Adeela BATOOL Climate Energy and Water Research Institute National Agricultural Research Center (NARC)

A large numbers of mountain communities in the Himalayan region depend on glacier-fed kuhl system – gravity flow irrigation, for their sustenance. The depletion and retreat of glaciers often result in disruption of melt flows to kuhl system, which ultimately impacts the agriculture as well as livelihood of the local communities. Sustainability of glacial resource was assessed for establishing kuhl irrigation system based on indices of glacier decrease by number(GDN) and glacier depletion by volume(GDV) during the 2001-2013 period. The selected factors are important in terms of understanding point source and reserve potential of glaciers for sustaining glacier-fed kuhl irrigation in this region. The sustainability of glaciers was found good(i.e. a least decrease or rather increase in glacier number and volume) in about 23.6% glaciers(ice reserves about 705.9 km^3) under >10 km^2 area class of glaciers mainly in Gilgit and Shigar river basins of the Karakoram range. In the 5–10 km^2 class of glaciers, sustainability was good in 49 glaciers(ice reserve 26.59 km^3) and under 1–5 km^2 class, in 558 glaciers(ice reserve 60.189 km^3). Overall sustainability of glaciers appears to prevail in the Karakoram basins. The lesser sustainability of glaciers in the Himalaya basins like Astore and Jhelum would apparently be compensated by monsoon and change in rainfall pattern. A regular monitoring of the glacier resource and utilizing advance water conservation techniques would help in coping with negative impacts of downwasting of glaciers and provide long-term support to kuhl irrigation system in the Himalayan region in future.

关键词： Kuhl irrigation Glacial resource Karakoram Himalaya Hindu Kush

Mosquito autogeny in Aedes caspius （Diptera： Culicidae）： alterations of larval nourishments reservation upon bacterial infection

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Insect Science 2013年第4期20卷 472-484页

作者： ashraf M. Ahmed Zoology Department College of Science King Saud University SaudiArabia Zoology Department College of Science Minia UniversityEl-Minia Egypt

The present study recorded mosquito autogeny for the first time amongst Aedes caspius species in the Eastern region of Saudi Arabia. Laboratory rearing showed an obligatory autogenous species of Ae. caspius since it foregoes blood feeding during its first ovarian cycle, even in the presence of the hosts （CD mouse）, but produces its second egg batch only if ingested a blood meal. Both morphological and molecular identification confirmed that both autogenous and anautogenous strains belong to the same species of Ae. caspius. Data from biochemical analysis showed significant 2, 1.6, and 1.4 folds higher total carbohydrates, proteins, and lipids reserves respectively in the fourth larval instar of the autogenous strain compared to that of the anautogenous ones. In addition, exposing the fourth larval instars of autogenous strain to the infection stress by the mosquito larvicidal bacterium, Bacillus thuringiensis var kurstaki has significantly reduced total carbohydrates, proteins and lipids reserves by 29%, 35%, and 46%, respectively, at 12 h postinfection compared to those of uninfected ones. These reductions in nourishment reserves were more pronounced at 24 h postinfection in the case of proteins and lipids, but not carbohydrates. These results may indicate that bacterial infection is a health stress that significantly reduced nourishments reservation, which may interrupt the success of adult autogeny. However, the impact of infection-induced decline in larval nourishments reservation on successful adult autogeny is still to be investigated.

关键词： Aedes caspius anautogeny autogeny Bacillus thuringiensis nourishmentsreservation

An Efficient Scheme for Data Pattern Matching in IoT Networks

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Computers, Materials & Continua 2022年第8期72卷 2203-2219页

作者： ashraf Ali Omar A.Saraereh Department of Electrical Engineering Engineering FacultyThe Hashemite UniversityZarqa13133Jordan

The Internet has become an unavoidable trend of all things due to the rapid growth of networking technology,smart home technology encompasses a variety of sectors,including intelligent transportation,allowing users to communicate with anybody or any device at any time and from ***,most things are different ***:Structured data is a form of separated storage that slows down the rate at which everything is *** pattern matching is commonly used in data connectivity and can help with the issues mentioned ***:The present pattern matching system is ineffective due to the heterogeneity and rapid expansion of large IoT *** method requires a lot of manual work and has a poor match with real-world *** the modern IoT context,solving the challenge of automatic pattern matching is ***:A three-layer mapping matching is proposed for heterogeneous data from the IoT,and a hierarchical pattern matching *** feature classification matching,relational feature clustering matching,and mixed element matching are all examples of feature classification *** layer-by-layer matching,the algorithm gradually narrows the matching space,improving matching quality,reducing the number of matching between components and the degree of manual participation,and producing a better automatic mode ***:The algorithm’s efficiency and performance are tested using a large number of data samples,and the results show that the technique is practical and ***:the proposed algorithm utilizes the instance information of the data *** deploys three-layer mapping matching approach and mixed element matching and realizes the automatic pattern matching of heterogeneous data which reduces the matching space between elements in complex *** improves the efficiency and accuracy of automatic matching.

关键词： Internet of things distributed computing optimization feature classification

Beamforming Performance Analysis of Millimeter-Wave 5G Wireless Networks

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Computers, Materials & Continua 2022年第3期70卷 5383-5397页

作者： Omar A.Saraereh ashraf Ali Deparment of Electrical Engineering Engineering FacultyThe Hashemite UniversityZarqa13133Jordan

With the rapid growth in the number of mobile devices and user connectivity,the demand for higher system capacity and improved qualityof-service is *** the demand for high-speed wireless communication grows,numerous modulation techniques in the frequency,temporal,and spatial domains,such as orthogonal frequency division multiplexing(OFDM),time division multiple access(TDMA),space division multiple access(SDMA),and multiple-input multiple-output(MIMO),are being *** with those approaches,electromagnetic waves’orbital angular momentum(OAM)is attracting attention because it has the potential to boost the wireless communication *** electromagnetic radiation can be described by a sum of Eigen functions with unique eigenvalues,as is well *** order to address such issues,the millimeter-wave(mmWave)communication is proposed which is considered as one of the potential technology for 5G wireless *** intrinsic feature of all electromagnetic waves is *** OAM beams’unique qualities have led to a slew of new *** OAM generators,on the other hand,have gotten very little attention,especially in the mmWave frequency *** use of OAM in conjunction with mmWave can reduce the beam power loss,enhance the received signal quality,and hence increase the *** transmitter and receiver antennas must be coaxial and parallel to achieve precise mode *** proposed mmWave integrated with OAM system model is discussed in this *** channel model is created using the channel transition *** simulation results demonstrate that the proposed system model is a good way to boost the system capacity.

关键词： Antennas beamforming radiation pattern mmwave optimization

Effect of Lanthanum on Nodule Count and Nodularity of Ductile Iron

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Journal of Rare Earths 2007年第5期25卷 533-536页

作者： M. ashraf Sheikh Javed Iqbal University of Engineering & Technology

The present study aims at finding out the effect of the addition of a single rare earth element, that is, lanthanum on the nodularity and nodule count of ductile iron under controlled conditions. For this purpose, four melts with different compositions were made, using a 28 kg inductotherm medium frequency induction furnace. The temperature was carefully maintained between 1400 and 1450 ℃ for these heats. A good quality charge consisting of Sorel metal, ferrosilicon, Swedish iron, ferrosilicon magnesium, and ferrosilicon lanthanum was used for the production of melts. A vertically parted sand mould was used for casting of 10 test bars made from local silica sand. Standard coin samples were chill-cast to conduct chemical analysis of the ductile iron. Mierostructure study of the samples was conducted using a Leica optical microscope. Nodule count and nodularity of the samples were carried out using an image analyzer. The results obtained indicated that with the increased addition of lanthanum the nodule count of ductile iron increased, thus making it evident that it played a significant role in increasing the mechanical properties. The highest nodule count of 467 was obtained with the addition of 0.03% lanthanum. However, the effect of lanthanum on nodularity was negligible with nodularity ranging from 81% to 83 %.

关键词： ductile iron mischmetal nodulization nodulafity nodule count rare earths