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排序方式: 共有146条查询结果,搜索用时 15 毫秒
61.
Recycled Natural Fiber Polypropylene Composites: Water Absorption/Desorption Kinetics and Dimensional Stability 总被引:1,自引:0,他引:1
Detailed analysis of the effects of recycling process on long-term water absorption, thickness swelling and water desorption
behavior of natural fiber polypropylene composites is reported. Composite materials containing polypropylene and wood flour,
rice hulls or bagasse fibers were produced at constant fiber loading and were exposed to a simulated recycling process consisting
of up to five times grinding and reprocessing under controlled conditions. A wide range of analytical methods including water
absorption/desorption tests, thickness swelling tests, density measurement, scanning electron microscopy, image analysis,
contact angle, fiber length analysis and Fourier transform infrared spectroscopy was employed to understand the hygroscopic
behavior of the recycled composites. Water absorption and thickness swelling behaviors were modeled using existing predictive
models. Results indicated that generally the recycled composites had considerably lower water absorption and thickness swellings
as compared with the original composites which were attributed to changes in physical and chemical properties of the composites
induced by the recycling process. 相似文献
62.
Ammonia-oxidizing bacteria and phenol-degrading yeast were isolated in order to study the synergism effects of phenol-degrading yeast and ammonia-oxidizing bacteria for enhancing the nitrification in coke wastewater from the Isfahan Steel Company. The influent and effluent samples with approximately 600-1200 mg L(-1) ammonium and 550-2350 mg L(-1) phenol were collected aseptically in sterile flasks. The biodegradation of phenol and nitrification were studied with different treatments. The results showed that addition of Na2CO3 and autotrophic bacteria to wastewater increased the ammonium removal by 100%. Furthermore, the synergism effects of phenol-degrader yeast and autotrophic bacteria reduced the time for ammonium removal. 相似文献
63.
Mehdi Razzaghi 《Environmental and Ecological Statistics》2009,16(1):25-36
To establish allowable daily intakes for humans from animal bioassay experiments, benchmark doses corresponding to low levels
of risk have been proposed to replace the no-observed-adverse-effect level for non-cancer endpoints. When the experimental
outcomes are quantal, each animal can be classified with or without the disease. The proportion of affected animals is observed
as a function of dose and calculation of the benchmark dose is relatively simple. For quantitative responses, on the other
hand, one method is to convert the continuous data to quantal data and proceed with benchmark dose estimation. Another method
which has found more popularity (Crump, Risk Anal 15:79–89; 1995) is to fit an appropriate dose–response model to the continuous
data, and directly estimate the risk and benchmark doses. The normal distribution has often been used in the past as a dose–response
model. However, for non-symmetric data, the normal distribution can lead to erroneous results. Here, we propose the use of
the class of beta-normal distribution and demonstrate its application in risk assessment for quantitative responses. The most
important feature of this class of distributions is its generality, encompassing a wide range of distributional shapes including
the normal distribution as a special case. The properties of the model are briefly discussed and risk estimates are derived
based on the asymptotic properties of the maximum likelihood estimates. An example is used for illustration.
相似文献
Mehdi RazzaghiEmail: |
64.
Laadroui Jawad Rachida Aboufatima Ouarhach Aicha Kenza Bezza Zineb El Gabbas Ait Laaradia Mehdi 《毒物与环境化学》2013,95(1-2):129-147
AbstractThe aims of the study are to assess some effects of smoking for 3?months and of withdrawal of male weaned rats on anxiety, locomotor activity, and depression using common behavioral tests such as the marble burying, open field, and forced swim tests. Somatic signs of abstinence and histological effects were also studied. The rats present changes of the aforementioned behaviors as well as histological alterations of the lungs. 相似文献
65.
Mehdi Bagheri Mehrdad BagheriFarzane Heidari Ali Fazeli 《Journal of Loss Prevention in the Process Industries》2012,25(1):40-51
New chemical process design strategies utilizing computer-aided molecular design (CAMD) can provide significant improvements in process safety by designing chemicals with required target properties and the substitution of safer chemicals. An important aspect of this methodology concerns the prediction of properties given the molecular structure. This study utilizes one such emerging method for prediction of a hazardous property, flash point (FP), which is in the center of attention in safety studies. Using such a reliable data set comprising 1651 organic and inorganic chemicals, from 79 diverse material classes, and robust dynamic binary particle swarm optimization for the feature selection step resulted in the most efficient molecular features of the FP investigations. Apart from the simple yet precise five-parameter multivariate model, the FP nonlinear behavior was thoroughly investigated by a novel hybrid of particle swarm optimization and support vector regression. Besides, 195 missing experimental FPs of the DIPPR data set are predicted via the presented procedure. 相似文献
66.
Ghanbarzadeh Lak M Sabour MR Amiri A Rabbani O 《Waste management (New York, N.Y.)》2012,32(10):1895-1902
The effectiveness of Fenton process in municipal landfill leachate treatment, as a pre- or post-treatment approach, has been demonstrated. However, no general recommendations of universal validity could be made in the term of optimized conditions affecting Fenton process. At the first stage of this study, collected leachate samples from Aradkooh site, Tehran, Iran, were investigated using one-factor-at-a-time method to find out optimum coagulation pH and flocculation time values. Subsequently, the obtained results in addition to data issued previously by the authors were employed to develop a predictive model of the true response surface, namely chemical oxygen demand (COD) removal efficiency. Finally, the main parameters of Fenton procedure, i.e. initial pH, [H(2)O(2)]/[Fe(2+)] molar ratio, Fe(2+) dosage, and coagulation pH were optimized taking advantage of the above-mentioned quadratic model. The derived second-order model included both significant linear and quadratic terms and seemed to be adequate in predicting responses (R(2)=0.9896 and prediction R(2)=0.6954). It was found that the interaction between initial pH and Fe(2+) dosage has a significant effect on COD removal. While, the optimal [H(2)O(2)]/[Fe(2+)] molar ratio was independent of ferrous ion dosage. The optimum conditions for the maximum COD removal of 50.76% for the parameters of initial pH, [H(2)O(2)]/[Fe(2+)] molar ratio, Fe(2+) dosage, and coagulation pH were found to be 5.8, 8.0, 22,500mg/L, and 8.7 respectively. 相似文献
67.
Mehdi Miremadi 《Journal of the American Water Resources Association》1982,18(5):749-753
ABSTRACT: A study was conducted to evaluate the existing furrow irrigation system of Karun Agro Industry, a sugar cane plant in Daimcheh, Iran. Although the system is only eight years old, design and operational problems have reduced its efficiency by 50 percent. Lack of skilled irrigation workers, inadequate control of irrigation water, and problems with night irrigation have resulted in substantial revenue losses for the plant. This study evaluates the existing irrigation system, and recommends modifications and improvements to increase its efficiency. Final recommendations include the use of various irrigation methods, improvements to the existing system, and cancellation of night irrigation. 相似文献
68.
Hashemi Mir Moslem Rahbar Abolghasemi Sareh Sadat Ashournia Mehdi Modaberi Hadi 《Environmental science and pollution research international》2019,26(20):20344-20351
Environmental Science and Pollution Research - In the present study, NH4Cl-modified activated carbon was synthesized from rice husk and used as an adsorbent for removal of hinosan from underground... 相似文献
69.
Naqvi Syed Asif Ali Shah Syed Ale Raza Mehdi Muhammad Abuzar 《Environmental science and pollution research international》2020,27(34):42830-42849
Environmental Science and Pollution Research - This study quantifies the effect of real income, financial development, trade openness, and renewable energy consumption on the ecological footprint... 相似文献
70.
Raheleh Kafaei Rahim Tahmasbi Masomeh Ravanipour Dariush Ranjbar Vakilabadi Mehdi Ahmadi Abdolmajid Omrani Bahman Ramavandi 《Environmental science and pollution research international》2017,24(30):23498-23507
Asaluyeh is one of the most heavily industrialised areas in the world where gas, petrochemical, and many downstream industries are located. This study aims to survey the biomonitoring of four metals and one metalloid in children living in the vicinity of Asaluyeh area. To do this, we analysed the creatinine-adjusted urinary levels of arsenic (As), cadmium (Cd), vanadium (V), manganese (Mn), and nickel (Ni) in 184 elementary schoolchildren (99 boys and 85 girls) living in Asaluyeh and compared them with a reference population. The comparisons were done for two seasons (spring and fall). The results showed that in the case area (Asaluyeh), the levels of As, V, Mn, and Ni were significantly higher and that of Cd was not significantly higher than the reference city for both seasons. The mean concentration of metal(loid)s in Asaluyeh (case) and Sadabad (reference) area as μg g?1 creatinine was As 2.90 and 2.24, V 0.06 and 0.03, Mn 0.28 and 0.25, Ni 0.54 and 0.29, and Cd 0.31 and 0.28 in spring and As 3.08 and 2.28, V 0.07 and 0.03, Mn 0.30 and 0.26, Ni 0.91 and 0.30, and Cd 0.36 and 0.31 in the fall. Seasonal variations played a key role in determining urinary metal(loid) concentration, as we saw the significant level of As, Cd, V, and Ni in fall than in spring. With regard to the impact of gender on the absorption and accumulation of urinary metal(loid)s, boys showed higher levels of the studied elements, especially for As, than girls as outdoor activities are more popular among boys. Due to the values being lower than those reported in literature, more research is needed on various population groups and other exposure sources in order to judge whether living in the vicinity of the gas and petrochemical industries in Asaluyeh is a threat to nearby residents. 相似文献