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RISS 인기검색어
- 검색키워드
- 저자 : Z. Meng (검색결과 39 건)
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Meng, J.,Shi, F.H.,Meng, Qingxiang,Ren, L.P.,Zhou, Z.M.,Wu, H.,Zhao, L.P. Asian Australasian Association of Animal Productio 2015 Animal Bioscience Vol.28 No.1
The objective of this study was to evaluate the effects of different litter mixture compositions on bedding system temperature, pH and volatile fatty acid and ammonia-N ($NH_3$-N) content, and the serum physico-chemical parameters and growth indices of calves. Thirty-two Limousin calves ($280{\pm}20kg$) were randomly assigned to four groups (n = 8 for each group) according to the bedding system used: i) control with soil only (CTR); ii) mixture with 50% paddy hulls (PH), 30% saw dusts (SD), 10% peat moss (PM) and 10% corn cobs (CC) (TRT1); iii) mixture with 15% PH, 15% SD, 10% PM, 40% CC, and 20% corn stover (CS) (TRT2); iv) mixture with 30% PH, 10% PM, 40% CC, and 20% CS (TRT3). The litter material combinations of different treatments were based on the cost of bedding system materials in China. The cost of four treatments from low to high: Control<TRT1<TRT2<TRT3. The control was no-cost treatment. The diet consisted of 60.8% silage and 39.2% concentrate (dry matter [DM] basis). The $NH_3$-N level (271.83 to 894.72 mg/kg) was lowest for TRT1 (p<0.0001) and highest for TRT2 (p<0.0001). The acetate, propionate and butyrate levels were highest for the control group (p<0.0001). In all the groups, the pH value (6.90 to 9.09) increased at the beginning and later remained stable at below 9.09. The temperature of deep litter increased at the first week and reached the maximum ($42.1^{\circ}C$) on day 38. 3,5,3'-Triiodothyronine ($T_3$) levels in the TRT1 group animals (p<0.0001) were lower than those in the control and TRT2 animals. 3,5,3',5'-Tetraiodothyronine ($T_4$) in the TRT1 group (p = 0.006) was lower than that in the other treatment groups. Cortisol (COR) in the control and TRT1 group was lower (p<0.0001) than that in the TRT2 and TRT3 groups. Corticosterone (CORt) in the control group was higher (p<0.0001) than that in the treatment groups. The findings indicate that the deep litter bedding systems provided better conditions for animal health and growth performance compared with the control system. Furthermore, the litter composition of TRT1 was found to be optimal among the three treatment groups.
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J. Meng,F.H. Shi,Q.X. Meng,L.P. Ren,Z.M. Zhou,H. Wu,L.P. Zhao 아세아·태평양축산학회 2015 Animal Bioscience Vol.28 No.1
The objective of this study was to evaluate the effects of different litter mixture compositions on bedding system temperature, pH and volatile fatty acid and ammonia-N (NH3-N) content, and the serum physico-chemical parameters and growth indices of calves. Thirty-two Limousin calves (280±20 kg) were randomly assigned to four groups (n = 8 for each group) according to the bedding system used: i) control with soil only (CTR); ii) mixture with 50% paddy hulls (PH), 30% saw dusts (SD), 10% peat moss (PM) and 10% corn cobs (CC) (TRT1); iii) mixture with 15% PH, 15% SD, 10% PM, 40% CC, and 20% corn stover (CS) (TRT2); iv) mixture with 30% PH, 10% PM, 40% CC, and 20% CS (TRT3). The litter material combinations of different treatments were based on the cost of bedding system materials in China. The cost of four treatments from low to high: Control<TRT1<TRT2<TRT3. The control was no-cost treatment. The diet consisted of 60.8% silage and 39.2% concentrate (dry matter [DM] basis). The NH3-N level (271.83 to 894.72 mg/kg) was lowest for TRT1 (p<0.0001) and highest for TRT2 (p<0.0001). The acetate, propionate and butyrate levels were highest for the control group (p<0.0001). In all the groups, the pH value (6.90 to 9.09) increased at the beginning and later remained stable at below 9.09. The temperature of deep litter increased at the first week and reached the maximum (42.1°C) on day 38. 3,5,3′-Triiodothyronine (T3) levels in the TRT1 group animals (p<0.0001) were lower than those in the control and TRT2 animals. 3,5,3′,5′-Tetraiodothyronine (T4) in the TRT1 group (p = 0.006) was lower than that in the other treatment groups. Cortisol (COR) in the control and TRT1 group was lower (p<0.0001) than that in the TRT2 and TRT3 groups. Corticosterone (CORt) in the control group was higher (p<0.0001) than that in the treatment groups. The findings indicate that the deep litter bedding systems provided better conditions for animal health and growth performance compared with the control system. Furthermore, the litter composition of TRT1 was found to be optimal among the three treatment groups.
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A Novel Hybrid Bat Algorithm with Differential Evolution Strategy for Constrained Optimization
Xianbing Meng,X. Z. Gao,Yu Liu 보안공학연구지원센터 2015 International Journal of Hybrid Information Techno Vol.8 No.1
A novel hybrid Bat Algorithm (BA) with the Differential Evolution (DE) strategy using the feasibility-based rules, namely BADE is proposed to deal with the constrained optimization problems. The sound interferences induced by other things are inevitable for the bats which rely on the echolocation to detect and localize the things. Through integration of the DE strategy with BA, the insects’ interferences for the bats can be effectively mimicked by BADE. Moreover, the bats swarm’ mean velocity is simulated as the other bats’ effects on each bat. Having considered the living environments the bats inhabit, the virtual bats can be lifelike. Experiments on some benchmark problems and engineering designs demonstrate that BADE performs more efficient, accurate, and robust than the original BA, DE, and some other optimization methods.
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W. Z. Wang,Y. Z. Liu,G. Meng,P. N. Jiang 대한기계학회 2009 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.23 No.12
A nonlinear model of flow-structure interaction between steam leakage through labyrinth seal and the whirling rotor was presented. The particular concern was placed on incorporating thermal properties of the steam fluid into the mathematical model. To see the influence of the steam fluid on the whirling rotor, two sets of thermal parameters of the steam fluid, e.g., temperature and pressure drop in each seal cavity, were selected from the typical 1000 MW supercritical and 300 MW subcritical power units in China. The interlocking seal widely employed in practical situations was chosen for study. The rotor-seal system was modeled as a Jeffcott rotor subject to shear stress and pressure force associated with the steam leakage. Spatio-temporal variation of the steam forcing on the rotor surface in the coverage of the seal clearance and the cavity volume was specifically delineated by using the Muzynska model and the perturbation analysis, respectively. The governing equation of rotor dynamics including the influence of the steam leakage was solved by using the fourth-order Runge-Kutta method, resulting in the orbit of the whirling rotor. Stability of the rotor was inspected by using Liapunov’s first method. The results showed that the destabilization speed of the rotor was significantly influenced by the steam leakage.
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Development of a novel self-centering buckling-restrained brace with BFRP composite tendons
Z. Zhou,X.T. He,J. Wu,C.L. Wang,S.P. Meng 국제구조공학회 2014 Steel and Composite Structures, An International J Vol.16 No.5
Buckling-restrained braces (BRBs) have excellent hysteretic behavior while buckling-restrained braced frames (BRBFs) are susceptible to residual lateral deformations. To address this drawback, a novel self-centering (SC) BRB with Basalt fiber reinforced polymer (BFRP) composite tendons is presented in this work. The configuration and mechanics of proposed BFRP-SC-BRBs are first discussed. Then an 1840-mm-long BFRP-SC-BRB specimen is fabricated and tested to verify its hysteric and self-centering performance. The tested specimen has an expected flag-shaped hysteresis character, showing a distinct self-centering tendency. During the test, the residual deformation of the specimen is only about 0.6 mm. The gap between anchorage plates and welding ends of bracing tubes performs as expected with the maximum opening value 6 mm when brace is in compression. The OpenSEES software is employed to conduct numerical analysis. Experiment results are used to validate the modeling methodology. Then the proposed numerical model is used to evaluate the influence of initial prestress, tendon diameter and core plate thickness on the performance of BFRP-SC-BRBs. Results show that both the increase of initial prestress and tendon diameters can obviously improve the self-centering effect of BFRP-SC-BRBs. With the increase of core plate thickness, the energy dissipation is improved while the residual deformation is generated when the core plate strength exceeds initial prestress force.
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Z. W. HAN,X. MENG,M. LIN,Y. H. ZHANG,J. YANG,Y. R. WANG 대한설비공학회 2014 International Journal Of Air-Conditioning and Refr Vol.22 No.2
To solve the problem of the coefficient of performance (COP) decrease and power crunch incooling dominated South China associated with the long-term usage of ground-source heat pumpsystem (GSHPS), a hybrid ground-air source heat pump system (HGASHPS) with natural coldstorage is presented in this paper. The system consists of a GSHP system and compound aircooledchillers (CACC), which can be operated according to the vapor compression refrigerationcycle or separate type heat pipe natural cycle. The mathematical models of each part of thesystem were set up and the conversion conditions between operation modes for the system weredetermined. The transient simulation for HGASHPS with natural cold storage in Nanjing wascarried out. The operation characteristics of the systems in operational life were comparativelyanalyzed. The simulation results indicated that the HGASHPS with natural cold storage couldretain the thermal balance of soil temperature field in one year cycle and increase the COP andreliability of the system.
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Composite components damage tracking and dynamic structural behaviour with AI algorithm
Z.Y. Chen,Sheng-Hsiang Peng,Yahui Meng,Ruei-Yuan Wang,Qiuli Fu,Timothy Chen 국제구조공학회 2022 Steel and Composite Structures, An International J Vol.42 No.2
This study discusses a hypothetical method for tracking the propagation damage of Carbon Reinforced Fiber Plastic (CRFP) components underneath vibration fatigue. The High Cycle Fatigue (HCF) behavior of composite materials was generally not as severe as this of admixture alloys. Each fissure initiation in metal alloys may quickly lead to the opposite. The HCF behavior of composite materials is usually an extended state of continuous degradation between resin and fibers. The increase is that any layer-to-layer contact conditions during delamination opening will cause a dynamic complex response, which may be non-linear and dependent on temperature. Usually resulted from major deformations, it could be properly surveyed by a non-contact investigation system. Here, this article discusses the scanning laser application of that vibrometer to track the propagation damage of CRFP components underneath fatigue vibration loading. Thus, the study purpose is to demonstrate that the investigation method can implement systematically a series of hypothetical means and dynamic characteristics. The application of the relaxation method based on numerical simulation in the Artificial Intelligence (AI) Evolved Bat (EB) strategy to reduce the dynamic response is proved by numerical simulation. Thermal imaging cameras are also measurement parts of the chain and provide information in qualitative about the temperature location of the evolution and hot spots of damage.
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