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Experimental study on TLDs equipped with an upper mounted baffle
Shad, Hossein,Adnan, Azlan bin,Vafaei, Mohammadreza,Behbahani, Hamid Pesaran,Oladimeji, Abdulkareem M. Techno-Press 2018 Smart Structures and Systems, An International Jou Vol.21 No.1
Tuned Liquid Dampers (TLDs) have gained wide acceptance as a system for structural control and energy dissipation. However, they face limitation caused by low damping in deep water, which affects their efficiency. Another problem with deep water TLDs is that not all water depth participates in energy dissipation. This paper investigated the effect of upper mounted baffles on the effectiveness of TLDs. The Vertical Blockage Ratio (VBR) of baffles ranged from 10% - 90%. The TLD (with and without baffle), structure, and combined structure with TLD (with and without baffles) were subjected to free and harmonic forced vibrations. Results indicated that baffles could significantly enhance the energy dissipation of TLDs, thus reducing structural responses more than structures equipped with ordinary TLDs. It was found that, there was an optimum value of VBR in which the TLD's efficiency was maximized. When TLD had an appropriate VBR, the structural acceleration and displacement responses were suppressed significantly up to 51% and 56%, respectively.
Hossein Shad,Azlan Adnan,Hamid Pesaran Behbahani,Mohammadreza Vafaei 국제구조공학회 2016 Structural Engineering and Mechanics, An Int'l Jou Vol.60 No.1
Tuned Liquid Dampers (TLDs) provide low damping when it comes to deep water condition, and that not all water depth is mobilized in energy dissipation. This research focussed on a method to improve the efficiency of TLDs with deep water condition. Several bottom-mounted baffles were installed inside a TLD and the dynamic characteristics of modified TLDs together with their effect on the vibration control of a SDOF structure were studied experimentally. A series of free vibration and harmonic forced vibration tests were carried out. The controlling parameter in the conducted tests was the Vertical Blocking Ratio (VBR) of baffles. Results indicated that increase in VBR decreases the natural frequency of TLD and increases its damping ratio. It was found that the VBR range of 10% to 30% reduced response of the structure significantly. The modified TLD with the VBR of 30% showed the best performance when reduction in structural responses under harmonic excitations were compared.
Mahfuz, Shad,Song, Hui,Liu, Zhongjun,Liu, Xinyu,Diao, Zipeng,Ren, Guihong,Guo, Zhixin,Cui, Yan Asian Australasian Association of Animal Productio 2018 Animal Bioscience Vol.31 No.5
Objective: This experiment was conducted to evaluate the effects of golden needle mushroom (Flammulina velutipes) stem waste (FVW), on organic eggs production, calcium utilization, antibody response, serum immunoglobulin, and serum cytokine concentration at early phase of production in laying hens. Methods: A total 210, 19 weeks old aged ISA Brown layers were randomly assigned into 5 equal treatment groups, with 7 replications of 6 hens each. Dietary treatment included a standard basal diet as control; antibiotic (0.05% flavomycin); 2% FVW; 4% FVW; and 6% FVW. The experimental duration was 10 weeks. Results: There was no significant differences (p>0.05) on hen day egg production, egg weight, egg mass, feed intake, and feed conversion ratio (FCR) among experimental groups. Unmarketable eggs were significantly lower (p<0.05) both in 4% FVW and 6% FVW fed groups than control group. The calcium retention and calcium in egg shell deposition were significantly higher (p<0.05) in FVW inclusion groups than control and antibiotic groups. Antibody titers against Newcastle diseases were significantly higher (p<0.05) in 6% FVW fed group (except combined with 4% FVW at day 147) and infectious bronchitis were significantly higher (p<0.05) in FVW fed groups (except 2% FVW and 4% FVW at day 161) than control and antibiotic groups. Serum immunoglobulin sIgA was significantly higher (p<0.05) in all levels of FVW and IgG was significantly higher (p<0.05) in 4% FVW than control and antibiotic groups. Serum cytokine concentration interleukin-2 (IL-2) was significantly higher (p<0.05) in 6% FVW; IL-6 and tumor necrotic $factor-{\alpha}$ were significantly higher (p<0.05) both in 4% FVW and 6% FVW than control and antibiotic groups; IL-4 was significantly higher (p<0.05) in antibiotic, 2% FVW and 4% FVW fed groups than control. Conclusion: F. velutipes mushroom waste can be used as a novel substitute for antibiotic for organic egg production and sound health status in laying hens.
Experimental study on TLDs equipped with an upper mounted baffle
Hossein Shad,Azlan bin Adnan,Mohammadreza Vafaei,Hamid Pesaran Behbahani,Abdulkareem M. Oladimeji 국제구조공학회 2018 Smart Structures and Systems, An International Jou Vol.21 No.1
Tuned Liquid Dampers (TLDs) have gained wide acceptance as a system for structural control and energy dissipation. However, they face limitation caused by low damping in deep water, which affects their efficiency. Another problem with deep water TLDs is that not all water depth participates in energy dissipation. This paper investigated the effect of upper mounted baffles on the effectiveness of TLDs. The Vertical Blockage Ratio (VBR) of baffles ranged from 10% - 90%. The TLD (with and without baffle), structure, and combined structure with TLD (with and without baffles) were subjected to free and harmonic forced vibrations. Results indicated that baffles could significantly enhance the energy dissipation of TLDs, thus reducing structural responses more than structures equipped with ordinary TLDs. It was found that, there was an optimum value of VBR in which the TLD\'s efficiency was maximized. When TLD had an appropriate VBR, the structural acceleration and displacement responses were suppressed significantly up to 51% and 56%, respectively.
Jishma P,Shad K Shibil,Athulya EC,Sachidanandan P,Radhakrishnan EK 한국식물생명공학회 2021 Plant biotechnology reports Vol.15 No.4
The plant beneficial mechanisms shown by rhizobacteria are remarkable in its nature, distribution and execution. In the study, 11 rhizospheric bacterial isolates of Cyclea peltata (Indian moon-seed) were found to have strong inhibitory activity against Pythium myriotylum and Rhizoctonia solani. Among these, two Pseudomonas spp. (K6 and DN18) were identified to have a differential distribution of antifungal mechanisms. By LC–MS analysis, K6 and DN18 have been confirmed for the presence of metabolites such as phenazine-1-carboxylic acid (PCA), mono-rhamnolipid and di-rhamnolipid, 1-hydroxy phenazine, pyocyanin and pyrrolnitrin. Due to the well-demonstrated antifungal mechanisms of these compounds, the natural logic behind its rhizospheric presence can primarily be plant protective. A further molecular investigation has resulted in the identification of the gene responsible for rhamnolipid biosynthesis in Pseudomonas spp. K6 and DN18. In addition, isolate K6 has been confirmed for the production of chitinase in colloidal chitin agar. The wide range of chemical and enzymatic antifungal mechanisms shown by the isolated Pseudomonas spp. have also been found to offer growth enhancement and suppression of disease caused by Sclerotium rolfsii in cowpea (Vigna unguiculata (L.) Walp.) plants which make the study significant. Because of the enormous potential to control phytopathogens and augment plant growth, these candidate organ- isms can have field application potential.
Wazir Shabana,Ali Shad Sarfraz 한국응용곤충학회 2020 Journal of Asia-Pacific Entomology Vol.23 No.4
The dusky cotton bug (DCB), Oxycarenus hyalinipennis Costa (Hemiptera: Lygaeidae) is one of the most important pests of cotton. Fipronil belongs to phenylpyrazole and is being used against various insect pests. To reduce the resistance to this insecticide, the present study was planned to examine the inheritance mode and preliminary mechanism of resistance to fipronil in DCB. A fipronil selected strain had a 9855-fold level of resistance after 11 generations of selection with fipronil. The median lethal concentration of reciprocal crosses F 1 (FiproSel.♂×Lab-Pop♀) and F 1 - (Fipro-Sel.♀× Lab-Pop♂) showed no significant difference and degree of dominance values were 0.60 and 0.58 for F1 and F1 - ), respectively, suggesting autosomal and incompletely dominance of resistance to fipronil in fipronil selected strain of DCB. Monogenic model of inheritance revealed polygenic resistance to fipronil. Realized heritability (h 2 ) value was 0.24 for fipronil resistance. The study of synergism indicated that PBO (Piperonyl butoxide) and DEF (S, S-butyl phosphorotrithioateases) did not enhance the toxicity of fipronil on both populations. The study on inheritance mode of fipronil resistance in DCB may help delay the resistance with insecticides.
Afzal Muhammad Babar Shahzad,Riaz Muhammad,Shad Sarfraz Ali,Ijaz Mamuna 한국응용곤충학회 2022 Journal of Asia-Pacific Entomology Vol.25 No.4
Emamectin benzoate, a non-systemic, translaminar, and broad spectrum insecticide, is excessively used in cotton. It kills the pest by suppressing the muscle contraction. Phenacoccus solenopsis Tinsley (Hemiptera: Pseudo coccidae) is one of the major sap sucking pests of cotton in many countries and has been shown resistance to various insecticides. In this study, we have continuously selected P. solenopsis with emamectin benzoate in the laboratory from G 3 to G 18 to determine the resistance development and resistance risk to emamectin benzoate and also to evaluate the dynamics of cross-resistance (CR) development with three other insecticides. After continuing selection of P. solenopsis for 16 generations with emamectin benzoate, the emamectin selected strain (Ema-SEL) developed a 280.15-fold resistance when tested at G 19 . Ema-SEL strain showed no CR to abamectin (0.28–1.65-fold), and profenofos (0.12–0.29-fold), but a very low to low CR to cypermethrin (6.02–11.29-fold). Abamectin was negatively cross-resistant with emamectin benzoate in Ema-SEL strain at G 13 , G 15 and G 19 while profenofos also exhibited similar results at G 13 , G 15 , G 17 and G 19 . Realized heritability (h 2 ) of resistance to emamectin benzoate was 0.24 from G 3 to G 19 . The results of projected rate of resistance development showed that if h 2 = 0.24, 0.34, and 0.44 at slope = 1.08, then 2.03, 1.43, and 1.11 generations, respectively are required for tenfold increase in LC 50 at 95 % selection intensity. Results of the present study suggested that P. solenopsis has the ability to develop resistance to emamectin benzoate but it can be managed by the alternate use of other insecticides including abamectin, profenofos and cypermethrin due to lack of/or very low to low CR with these insecticides.