Summer Precipitation Changes over the Yangtze River Valley and North China: Simulations from CMIP3 Models

Gang Zeng,Wei-Chyung Wang,Caiming Shen,Zhixin Hao 한국기상학회 2014 Asia-Pacific Journal of Atmospheric Sciences Vol.50 No.3

We present a study of summer precipitation changes overthe Yangtze River Valley (YRV) and North China (NC) simulatedfrom 20 models of the CMIP3 (phase 3 of the Coupled Model IntercomparisonProject). It is found that the LASG-FGOALS-g1.0 (fgoals)model has the highest ability in simulating both the interannualvariability of individual regions and the seesaw pattern of the tworegions observed during the past few decades. Analyses of atmosphericcirculations indicate that the variability in precipitation isclosely associated with the 850 hPa meridional winds over the tworegions. Wetness in the YRV and dryness in NC are corresponding tostrong meridional wind gradient and weak meridional wind overthese two regions, respectively. The ability of a coupled generalcirculation model (CGCM) to simulate precipitation changes in theYRV and NC depends on how well the model reproduces bothobserved associations of precipitation with overlying meridionalwinds and observed meridional wind features in summer. Analysis offuture precipitation changes over the two regions projected by thefgoals model under the IPCC scenarios B1 and A1B suggests asignificant increase of 7-15% for NC after 2040s due to thestrengthened meridional winds, and a slight increase over the YRVdue to less significant intensification of the Mei-yu front.

A Stable Gait Planning Method of Biped Robot Based on Ankle motion Smooth Fitting

Dong En Zeng,Wang Dan Dan,Tong Ji Gang,Chen Chao,Wang Zeng Hui 제어·로봇·시스템학회 2018 International Journal of Control, Automation, and Vol.16 No.1

In ankle joint trajectory planning of biped robots, the spline interpolation generally leads to acceleration mutations on the key points, which weakens the stability of the biped robot. To solve this problem, a smooth function fitting method on ankle joint trajectory planning is proposed in this paper. In this method, the higher order derivatives of the ankle joint trajectory is smooth, and the acceleration mutation can be avoided. The biped robot gait planning of a whole cycle is accomplished by calculating the joint angle sequences of hip, knee and ankle. The effectiveness of the proposed method is demonstrated by numerical simulations on NAO robot gait planning. Experimental results show that the proposed method can improve the stability of the zero moment point (ZMP) margin effectively when it is applied to the bipedal robot gait planning on the non-horizontal ground.

Prognostic Significance of Beta-Catenin Expression in Patients with Esophageal Carcinoma: a Meta-analysis

Zeng, Rong,Duan, Lei,Kong, Yu-Ke,Wu, Xiao-Lu,Wang, Ya,Xin, Gang,Yang, Ke-Hu Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.15

Many studies have reported ${\beta}$-catenin involvement in the development of esophageal carcinoma (EC), but its prognostic significance for EC patients remains controversial. Therefore, we conducted this meta-analysis to explore the issue in detail. After searching PubMed, EMBASE, Web of Science, and Chinese Biomedical Literature Database, we included a total of ten relevant studies. We pooled the overall survival (OS) data using RevMan 5.2 software. The results showed that aberrant expression of ${\beta}$-catenin was associated with a significant increase of mortality risk (hazard ratio 1.71, 95%CI 1.46-2.01; p<0.00001). Subgroup analyses further suggested that aberrant expression of ${\beta}$-catenin resulted in poor OS of EC patients regardless of histological type of EC, study location or criteria for aberrant expression of ${\beta}$-catenin, and the sensitivity analyses revealed that the result was robust. The meta-analysis revealed that aberrant expression of ${\beta}$-catenin could be a predicative factor of poor prognosis for EC patients.

Experimental Study of Local Micro-forming for Bi-HTS

ZENG Pan,LU Yong-jin,LEI Li-ping,QU Timing,FANG Gang 한국소성가공학회 2010 기타자료 Vol.2010 No.6

The Bi-HTS (BSCCO high temperature superconductor) tape now has become the product in an industrial way, which has been available to apply in electric and electron fields. The main way to manufacture Bi-HTS tape is to use the technique of oxide powder in silver tube (OPIT), which involves the multi-step drawing and rolling with plastic deformation, which obviously belongs to a type of the micro-forming in macro-scale processing. There are two main characteristics founded: (a) contact and friction between silver and BSCCO surfaces, (b) interface between two materials. A series of micro-tensile experiments of silver foil with thicknesses of 0.03, 0.06 and 0.1 mm are designed to investigate the behaviors of silver with various scale of sizes. And the surface topography measurements have been carried out to analyze the changes in surface topography. Based upon experiments, some topics are researched which are referred to inhomogeneous, local effect, size effect, grain and micro-structure affecting, surface roughness, long-distance sausage phenomenon. Further the local breakdown of silver by Bi-HTS powder during process is analyzed through failure criterion. The results of this work will bring out an important exploration value to the theory and computation of microforming.

Constitutive Analysis of 6013 Aluminum Alloy in Hot Plane Strain Compression Process Considering Deformation Heating Integrated with Heat Transfer

Gang Xiao,Qinwen Yang,Luoxing Li,Jianmin Zeng 대한금속·재료학회 2016 METALS AND MATERIALS International Vol.22 No.1

Hot plane strain compression tests of 6013 aluminum alloy were conducted at temperatures ranging from 613 to 773 K and strain rates ranging from 10−3 to 10 s−1. A novel model is developed to describe the temperature rise considering deformation heating integrated with heat transfer in tests. The experimental flow stress data are corrected by the proposed novel model. Based on the corrected flow stress, the modified power function constitutive model is developed considering the coupled effects of deformation temperature and strain rate on flow stress. Meanwhile, another two widely used models, temperature-compensated power function and straincompensated hyperbolic sine constitutive model, are also established for the studied 6013 aluminum alloy. Finally, the three constitutive models are compared from the aspects of accuracy, stability and efficiency. It is found that the experimental flow stress is significantly affected by the temperature rise. Furthermore, the influence of heat transfer on temperature rise cannot be ignored. When the constitutive model is established, the coupled effects of deformation temperature and strain rate on flow stress should be considered. The modified power function constitutive model is the best one in describing the flow behavior among the three models.

A Hybrid Computational Intelligence Approach for the VRP Problem

Gang PENG,Kehan ZENG,Xiong YANG 한국정보기술융합학회 2013 JoC Vol.4 No.2

PGQ, a novel hybrid computational intelligence approach, in which Particle Swarm Optimization (PSO), Genetic Algorithm (GA) and quantum computation are integrated, is proposed to solve the Vehicle Routing Problem (VRP). In PSO, a quantum approach called QUP is proposed to update the particles. GA operators are employed to improve population quality. The simulation results indicate that the PGQ algorithm is very effective and is better than simple PSO and GA as well as PSO and GA mixed algorithm.

Investigation of Rise Time and Overshoot in Pulse Transformers with Different Topologies for Electromagnetic Trigger of SCRs

Gang Lv,Dihui Zeng,Tong Zhou 전력전자학회 2018 JOURNAL OF POWER ELECTRONICS Vol.18 No.3

This study investigates the influences of different core parameters on the dynamic performances, such as rise time and overshoot, in pulse transformers for the triggering circuit of SCRs. First, a simplified transformer equivalent circuit, which emerges from a standard transformer equivalent circuit, is developed to analyze the step response. Second, the relations between the dynamic performances and the parasitic parameters are calculated by the simplified equivalent circuit. Third, the variations of rise time and overshoot, which are vital to the stability of triggering SCRs, with different core parameters, such as mechanic dimensions and topologies, are comprehensively investigated by analyzing the parasitic parameters. Finally, prototype transformers are fabricated to experimentally validate the analysis. The presented method can practically instruct the design of a pulse transformer for triggering SCRs.

Tip Position Control of a Flexible-Link Manipulator with Neural Networks

Yuan-Gang Tang,Fu-Chun Sun,Zeng-Qi Sun,Ting-Liang Hu 대한전기학회 2006 International Journal of Control, Automation, and Vol.4 No.3

To control the tip position of a flexible-link manipulator;a neural network (NN) controller is proposed in this paper. The dynamics error used to construct NN controller is derived based on output redefinition approach. Without the filtered tracking en-or;the proposed NN controller can still guarantee the closed-loop system uniformly asymptotically stable as well as NN weights bounded. Furthermore;the tracking error of desired trajectory can converge to zero with the proposed controller. For comparison an NN controller with filtered tracking en-or is also designed for the flexible-link manipulator. Finally;simulation studies are carried out to verify the theoretic results.

Effects of age and diet forms on growth-development patterns, serum metabolism indicators, and parameters of body fat deposition in Cherry Valley ducks

Lv Gang,Zeng Qiufeng,Ding Xuemei,Bai Shiping,Zhang Keying 아세아·태평양축산학회 2022 Animal Bioscience Vol.35 No.2

Objective: This study was conducted to investigate the effects of age and diet forms on growth-development patterns, serum metabolism indicators, and parameters of body fat deposition in Cherry Valley ducks. Methods: According to the hatching age and initial weight, a total of 150 1-day-old male SM3 Cherry Valley ducks were randomly assigned to two diet forms (pellet vs powder form). Each treatment had with 5 replicates per treatment and 15 meat ducks per replicate. The study lasted 42 d, which was divided into two periods (1 to 21 vs 22 to 42 d). Results: Our results showed that compared with powder group, ducks in pellet group had greater growth performance during different period (p<0.05). The inflection point was 24 d and was not numerically affected by diet forms. Increasing age (42 vs 21 d) significantly increased the weight of body fat and hepatic fat metabolism related enzyme activities in ducks (p<0.05), meanwhile, increasing age (42 vs 21 d) improved serum metabolism indicators and decreased mRNA expression levels of fat metabolism-related genes in liver (p<0.05). Ducks fed different diets (pellet vs powder form) increased growth performance as well as the weight of body fat and improved serum metabolism indicators (p<0.05). In addition, interactions were found between age and diet forms on the levels of serum metabolism indicators in ducks (p<0.05). Conclusion: In conclusion, powder feed reduced growth performance of ducks, and the day of inflection point was 24 days old. Ducks with higher age or fed with pellet diet showed higher fat deposition. The effect of age and feed forms on body fat deposition might result from changes in the contents of serum metabolism indicators, key enzyme activity of lipid production, and hepatic gene expressions. Objective: This study was conducted to investigate the effects of age and diet forms on growth-development patterns, serum metabolism indicators, and parameters of body fat deposition in Cherry Valley ducks.Methods: According to the hatching age and initial weight, a total of 150 1-day-old male SM3 Cherry Valley ducks were randomly assigned to two diet forms (pellet vs powder form). Each treatment had with 5 replicates per treatment and 15 meat ducks per replicate. The study lasted 42 d, which was divided into two periods (1 to 21 vs 22 to 42 d).Results: Our results showed that compared with powder group, ducks in pellet group had greater growth performance during different period (p<0.05). The inflection point was 24 d and was not numerically affected by diet forms. Increasing age (42 vs 21 d) significantly increased the weight of body fat and hepatic fat metabolism related enzyme activities in ducks (p<0.05), meanwhile, increasing age (42 vs 21 d) improved serum metabolism indicators and decreased mRNA expression levels of fat metabolism-related genes in liver (p<0.05). Ducks fed different diets (pellet vs powder form) increased growth performance as well as the weight of body fat and improved serum metabolism indicators (p<0.05). In addition, interactions were found between age and diet forms on the levels of serum metabolism indicators in ducks (p<0.05).Conclusion: In conclusion, powder feed reduced growth performance of ducks, and the day of inflection point was 24 days old. Ducks with higher age or fed with pellet diet showed higher fat deposition. The effect of age and feed forms on body fat deposition might result from changes in the contents of serum metabolism indicators, key enzyme activity of lipid production, and hepatic gene expressions.

Using the Lymph Node Ratio to Evaluate the Prognosis of Stage II/III Breast Cancer Patients Who Received Neoadjuvant Chemotherapy and Mastectomy

San-Gang Wu,Qun-Li Zeng,Juan Zhou,Jia-Yuan Sun,Fengyan Li,Qin Lin,Huan-Xin Lin,Xun-Xing Gaun,Zhen-Yu He 대한암학회 2015 Cancer Research and Treatment Vol.47 No.4

Purpose This study was conducted to investigate the prognostic value of lymph node ratio (LNR) instage II/III breast cancer patients who undergo mastectomy after neoadjuvant chemotherapy. Materials and MethodsClinical and pathological data describing stage II/III breast cancer patients were includedin this retrospective study. The primary outcomes were locoregional recurrence-free survival(LRFS), distant metastasis-free survival (DMFS), disease-free survival (DFS), and overallsurvival (OS). ResultsAmong 277 patients, there were 43 ypN0, 64 ypN1, 89 ypN2, and 81 ypN3 cases. Additionally, there were 43, 57, 92 and 85 cases in the LNR 0, 0.01-0.20, 0.21-0.65, and> 0.65 groups, respectively. The median follow-up was 49.5 months. Univariate analysisshowed that both ypN stage and LNR were prognostic factors of LRFS, DMFS, DFS, and OS(p < 0.05). Multivariate analysis showed that LNR was an independent prognostic factor ofLRFS, DMFS, DFS, and OS (p < 0.05), while ypN stage had no effect on prognosis (p > 0.05). ConclusionThe integrated use of LNR and ypN may be suitable for evaluation the prognosis of stageII/III breast cancer patients who undergo mastectomy after neoadjuvant chemotherapy.