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1.
Mohammad Abu Shayed Heike Hund Rolf Dieter Hund Chokri Cherif 《Fibers and Polymers》2016,17(2):229-240
Thermal and oxidation resistant coating is necessary for carbon fiber (CF) in CF reinforced concrete (CFRC) composite application in order to fulfil a high level of safety standard in case of fire. Pre-ceramic coatings such as Polysilazane, Polysiloxane, and Methyl silicone resin have been deposited on CF filament yarn by means of wet chemical continuous dip coating method. The surface analyses e.g. scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and infrared spectroscopy (IR) results showed the changes of surface morphology by the coatings. Thermo gravimetric analysis (TGA) revealed that the high temperature (up to 800 °C) oxidation stability of CF was significantly improved with coatings. Thermo-mechanical properties also significantly enhanced up to 600 °C. CF yarn retains its original strength and elasticity modulus/stiffness at 700 °C due to thermal and oxidation resistant coatings. 相似文献
2.
The pumpkin fly Dacus frontalis (Diptera: Tephritidae): a new pest of curcubits in Tunisia 下载免费PDF全文
A. Hafsi K. Abbes A. Harbi S. Ben Othmen E. Limem M. Elimem M. Ksantini B. Chermiti 《EPPO Bulletin》2015,45(2):209-213
The pumpkin fly Dacus frontalis is reported in this paper for the first time in Tunisia, where it was found in several locations. It is a pest of cucurbits of economic importance and is common especially in the eastern and southern parts of Africa. D. frontalis was collected from infested cucumber fruits in the region of El‐Jebil (Kairouan) and female bait traps for the Mediterranean fruit fly Ceratitis capitata and the olive fly Bactrocera oleae. Preliminary data from Tunisia suggest that D. frontalis is already established in four regions in which cucurbits are important crops. Brief notes on the diagnostic features for the species, its ecology and geographic distribution are given. Symptoms on cucumber from Tunisia are presented. 相似文献
3.
Menadi Salah Eddine Mura Alessandra Santucciu Cinzia Ghalmi Farida Hafsi Fella Masala Giovanna 《Tropical animal health and production》2020,52(3):935-942
Tropical Animal Health and Production - A cross-sectional study was conducted to determine the seroprevalence and the risk factors associated with C. burnetii infection in cattle in the state of... 相似文献
4.
Assessing solid waste compost application as a practical approach for salt-affected soil reclamation
Abdelbasset Lakhdar Chokri Hafsi Ahmed Debez Francesco Montemurro Naceur Jedidi Chedly Abdelly 《Acta Agriculturae Scandinavica, Section B - Plant Soil Science》2013,63(3):284-288
Abstract A short-term pot experiment was made to evaluate the effectiveness of municipal solid waste compost amendment on salt-affected soil. Hordeum maritimum plants were cultivated in pots filled with a clay-loam soil containing 0 or 40 t ha?1 of compost and irrigated with tap water at 0 or 4 g l?1 NaCl. Soil properties and heavy metal (Zn2 +, Pb2 +, Cd2 +) accumulation were investigated. Municipal solid waste compost application significantly increased the soil contents of carbon, nitrogen and potassium under both non-saline and saline conditions. Soil heavy metal concentrations increased substantially too, but the recorded values were below the toxicity limits. Interestingly, plants subjected to the salt–compost interaction were more vigorous, compared with those grown on non-amended soil. Altogether, our data indicate that short-term utilization of municipal solid waste compost at 40 t ha?1 may be of potential interest in the perspective of the rehabilitation of salt-affected soils. Yet, it must be stressed that the present findings are preliminary and need to be further evaluated under field conditions before practical recommendations can be inferred. 相似文献
5.
Flag Leaf Senescence, as Evaluated by Numerical Image Analysis, and its Relationship with Yield under Drought in Durum Wheat 总被引:2,自引:0,他引:2
M. Hafsi W. Mechmeche L. Bouamama A. Djekoune M. Zaharieva P. Monneveux 《Journal of Agronomy and Crop Science》2000,185(4):275-280
Senescence was evaluated at different stages of the grain‐filling period in eight durum wheat varieties using numerical image analysis (NIA). The varieties were grown under early, severe drought conditions on the high plains of Sétif in Algeria. After flowering, three different irrigation treatments were applied. Treatment effect was small, while a genotypic effect was noted for most of the senescence parameters. Senescence correlated to biomass, while the maximal rate of senescence, Vsmax, correlated to thousand‐kernel weight. The potential of the method of numerical image analysis for monitoring flag leaf senescence, detecting genotypic variability and selecting genotypes with delayed senescence is discussed. 相似文献
6.
Phytoparasitica - Frugivorous fruit flies are considered among the most damaging pests of cultivated fruit crops. The most studied ones are those belonging to the Tephritidae family such as the... 相似文献
7.
This article correlates draw frame settings with quality characteristics of sliver and ring spun yarn using artificial neural
networks. Considering the importance of draw frame as the last quality improvement machine in the spinning process, the quality
influencing parameters of the draw frame were used as input for artificial neural networks. The neural networks were trained
using a combination of Levenberg-Marquardt algorithm and Bayesian regularization for better generalization of the networks.
Cross validation was performed for each trained network to test the performance of networks. The promising results achieved
by this research work emphasize the ability of neural networks to predict the quality characteristics of sliver and yarn using
the artificial neural networks. Therefore, draw frame parameters can be adjusted on the basis of required sliver and yarn
quality. Furthermore, machines can be involved in the decision making process in spinning mills. 相似文献
8.
Makrem Afif Chokri Messaoud Abdennacer Boulila Hnia Chograni Afef Bejaoui Mohamed Nejib Rejeb Mohamed Boussaid 《Annals of Forest Science》2008,65(7):710-710
9.
Najla Dhen Imen Ben Ammar Chokri Bayoudh Bouthaina Al Mohandes Dridi 《Communications in Soil Science and Plant Analysis》2019,50(8):959-973
Quality of vegetable seedlings is affected by nursery management practices, essentially growing media. For sustainable greenhouse horticulture, it is important to characterize biologically based approaches to improve plantlet quality. Here, we investigate the possibility of developing a biotized growth substrate for nursery production using date palm wastes (DPWs) peat as an alternative to commercial sphagnum peat and indigenous arbuscular mycorrhizal fungi (AMF). A greenhouse experiment was established using different rates of DPWs peat to substitute commercial peat in both conventional and organic nursery production systems. Lettuce seedlings were inoculated or not with native AMF isolated from plots with conventional or organic production system (CM and OM respectively). When lettuce plantlets attained commercial size, a microscopic observation revealed that the establishment of mycorrhizal association was successful in all mixtures of growing media. Significant increase in growth parameters (height shoot, number and area of leaves, shoot and root biomass) were observed on plantlets inoculated with indigenous AMF isolated from organic plot compared to those isolated from conventional plot and to control (without AMF). Commercial peat partial substitution with DPWs peat in proportion of 25–50% improves better lettuce performance than complete-peat use. Consequently, these mixtures seem to be an appropriate formulation for sustainable nursery production. 相似文献
10.