Hurricanes from the South: On the situations and reasons of Canadian Americanization since World War II

He Jiantao(Jiantao He) 한국캐나다학회 2007 Asia-Pacific Journal of Canadian Studies (APJCS) Vol.13 No.2

Since the beginning of the 20th century, especially since the Second World War, Americanization has been posing a grave threat to Canada. The appearance of such a situation was not accidental but has the deep-rooted political, economic and cultural reasons. In the paper; the Author first expounds the situations of Canadian Americanization and Canadian nationalists’ worrying, and then analyzes the reasons of Canadian Americanization. The Author thinks that although Canada will not lose her cultural identity under the influences of Americanization in future, it is still difficult for Canada to totally avoid it.

Optimization of a piezoelectric wind energy harvester with a stepped beam

Jiantao Zhang,Dong Qu,Zhou Fang,Chang Shu 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.11

A galloping-based piezoelectric energy harvester using the stepped cantilever beam is proposed and investigated. Transverse galloping is induced with the square cross sectioned bluff body. When the wind speed exceeds the critical wind speed, the self-excited oscillation of the harvester occurs and more output power is generated. To obtain the optimal design of the energy harvester, the sequential quadratic programming (SQP) and the evolution strategy (ES) are employed to determine the optimal solution. The finite element method is used to calculate the output voltage of the harvester. After optimization, the output voltage of the optimal harvester is significantly improved in comparison with that of the initial one. Two prototype harvesters based on the initial and optimal dimensions were fabricated and measured experimentally. An open-circuit rms voltage of 36 V and an output power of 0.52 mW were obtained at the wind speed of 14 m/s for the optimal harvester. They are about 8.3 times and 4.73 times of that of the initial harvester. The validity of the optimal design is verified with the experimental results.

The Remote Data Monitoring Design Based on Wireless Sensor Network

Jiantao Cui,Han Li 보안공학연구지원센터 2016 International Journal of Future Generation Communi Vol.9 No.8

Genetic architecture of flag leaf length and width in rice (Oryza sativa L.) revealed by association mapping

Jiantao Wu,Yongwen Qi,Guanglong Hu,Jinjie Li,Zichao Li,Hongliang Zhang 한국유전학회 2017 Genes & Genomics Vol.39 No.3

Rice flag leaf is the main photosynthetic organ and plays a key role in grain yield. In this study, 106 loci associated with flag leaf length and width were identified using association mapping in a rice mini core collection. Analyzing the phenotypic effects of each allele represented 156 positive and 167 negative alleles, with a few alleles showing inconsistent effect in different environments. Among the 106 loci, 69 were environment-specific loci, 16 were environmentally stable and 21 were environmentally sensitive. Fifteen associated markers were shared by two traits and were designated as pleiotropic markers. According to the frequency distribution of alleles in different variety types, 343 alleles were categorized into three types based on geographic source and usage in breeding. Among these, 156 were used alleles, 138 were unused and 49 were foreign alleles. The results further our understanding of the genetic mechanisms of flag leaf length and width.

Seismic behavior of Q690 circular HCFTST columns under constant axial loading and reversed cyclic lateral loading

Jiantao Wang,Qing Sun 국제구조공학회 2019 Steel and Composite Structures, An International J Vol.32 No.2

This paper presents an investigation on seismic behavior of out-of-code Q690 circular high-strength concrete-filled thin-walled steel tubular (HCFTST) columns made up of high-strength (HS) steel tubes (yield strength fy ≥ 690 MPa). Eight Q690 circular HCFTST columns with various diameter-to-thickness (D/t) ratios, concrete cylinder compressive strengths (fc) and axial compression ratios (n) were tested under the constant axial loading and reversed cyclic lateral loading. The obtained lateral load-displacement hysteretic curves, energy dissipation, skeleton curves and ductility, and stiffness degradation were analyzed in detail to reflect the influences of tested parameters. Subsequently, a simplified shear strength model was derived and validated by the test results. Finally, a finite element analysis (FEA) model incorporating a stress triaxiality dependent fracture criterion was established to simulate the seismic behavior. The systematic investigation indicates the following: compared to the D/t ratio and axial compression ratio, improving the concrete compressive strength (e.g., the HS thin-walled steel tube filled with HS concrete) had a slight influence on the ductility but an obvious enhancement of energy dissipation and peak load; the simplified shear strength model based on truss mechanism accurately predicted the shear-resisting capacity; and the established FEA model incorporating steel fracture criterion simulated well the seismic behavior (e.g., hysteretic curve, local buckling and fracture), which can be applied to the seismic analysis and design of Q690 circular HCFTST columns.

Rollover crashworthiness analysis and optimization of bus frame for conceptual design

Jiantao Bai,Guangwei Meng,Wenjie Zuo 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.7

At the conceptual design stage, utilizing the detailed model to determine the rollover crashworthiness of bus structure would need long design cycle. Currently, rectangular thin-walled beams (RTWBs) are extensively used to create the real bus because of the excellent manufacturability. Remarkably, dual rectangular thin-walled beams (DRTWBs) can generate higher bending resistance. Therefore, this paper presents a rollover crashworthiness analysis and optimization method of bus frame using the RTWBs and DRTWBs. The bus frame with tire, suspension and platform structures is created in the CarFrame software. Analysis numerical example verifies that the frame model, which reduces the modeling and computational costs, is in excellent agreements with the detailed model, and optimization numerical example verifies that the frame model can obtain high rollover crashworthiness and lightweight bus structure. Therefore, the frame model can effectively replace the detailed model for the rollover crashworthiness analysis and optimization.

Effects of fermented feed on growth performance, nutrient metabolism and cecal microflora of broilers

Li Jiantao,Tao Lijuan,Zhang Rong,Yang Guiqin 아세아·태평양축산학회 2022 Animal Bioscience Vol.35 No.4

Objective: To investigate the effects of enzyme-bacteria co-fermented feed on broilers, the basal diet (BF) was pretreated by microbial enzyme co-fermentation, and then different proportions of BF were replaced to study its effects on growth performance, nutrient metabolism and cecal microflora of broilers. Methods: Four hundred and eighty 1-day-old broilers were randomly divided into 6 groups. The control group was fed with BF, and groups 1 to 4 were treated with dried fermented feed (DFF) instead of 10%, 15%, 20%, and 25% the BF, and group 5 was treated with wet fermented feed (WFF) instead of 10% the BF, named BF, 10% DFF, 15% DFF, 20% DFF, 25% DFF, and 10% WFF, respectively. The trial period was 42 days. Results: The results showed that the average daily feed intake and average daily gain of 10% DFF, 15% DFF, and 10% WFF groups were significantly higher than those of the control group at 22 to 42 days and 1 to 42 days (p<0.05). Except for 10% DFF group, Firmicutes of all treatment were higher than that of control group. The Bacteroides of each treatment group were lower than that of the control group (p>0.05). At the same time, the nutrient apparent metabolic rate and cecal microbial abundance of each treatment group had an increasing trend (p>0.05). Conclusion: In conclusion, the feed fermented by enzyme and bacteria had a potential promoting effect on the growth performance and nutrient digestibility of broilers. Objective: To investigate the effects of enzyme-bacteria co-fermented feed on broilers, the basal diet (BF) was pretreated by microbial enzyme co-fermentation, and then different proportions of BF were replaced to study its effects on growth performance, nutrient metabolism and cecal microflora of broilers.Methods: Four hundred and eighty 1-day-old broilers were randomly divided into 6 groups. The control group was fed with BF, and groups 1 to 4 were treated with dried fermented feed (DFF) instead of 10%, 15%, 20%, and 25% the BF, and group 5 was treated with wet fermented feed (WFF) instead of 10% the BF, named BF, 10% DFF, 15% DFF, 20% DFF, 25% DFF, and 10% WFF, respectively. The trial period was 42 days.Results: The results showed that the average daily feed intake and average daily gain of 10% DFF, 15% DFF, and 10% WFF groups were significantly higher than those of the control group at 22 to 42 days and 1 to 42 days (p<0.05). Except for 10% DFF group, Firmicutes of all treatment were higher than that of control group. The Bacteroides of each treatment group were lower than that of the control group (p>0.05). At the same time, the nutrient apparent metabolic rate and cecal microbial abundance of each treatment group had an increasing trend (p>0.05).Conclusion: In conclusion, the feed fermented by enzyme and bacteria had a potential promoting effect on the growth performance and nutrient digestibility of broilers.

The Model of a New Self-owned Brand Product’ Ad Expenditure and Pricing

CAO Jiantao 한국세무회계학회 2019 세무회계연구 Vol.0 No.60

A new self-owned brand firm (NBF), by changing strategies of advertising expenditure and pricing, is able to compete with an incumbent brand firm (IBF) and maximize its profit. When the existing competitive market share (CMS) is sufficiently large, a sub game Nash equilibrium in the game between NBF and IBF is proven. In equilibrium, the level of NBF’s price and advertising expenditure is higher than the corresponding level of the incumbent one. And, the equilibrium price and advertising expenditure of the new brand product are related to the size of CMS and the degree of price sensitivity. The larger the size of CMS or the smaller the price sensitivity, the higher level of NBF’s price and advertising spending is. In addition, when CMS is relatively smaller, NBF should take the following-leader strategy to make the level of NBF’s price and advertising spending equal IBF’s. The research results have important guiding significance for OEM enterprises to devise their own brands.

Study of IoT Terminal Interface Platform Based on Embedded Technology and Zigbee Protocol

Cui Jiantao,Zhao Xiaojun 보안공학연구지원센터 2016 International Journal of Future Generation Communi Vol.9 No.6

With the development of IoT (interest of things) and network routing technology, IoT terminal data collection, integration and transmission technology improved significantly. Currently, research and use of IoT gradually widespread, but more of the terminal platforms were exploited for particular field. The versatility and compatibility of platform restrict its use and promotion. Based on the point, this paper aims to develop an IoT embedded system with flexible interface. Exploit the flexible interface with multi-sensor terminal access and ZigBee protocol to achieve MANET, sensor flexible access, low level of energy consumption, network isolation. The system has a high level of scalability and important value and practical significance to IoT application development.

Structural optimization of multistage centrifugal pump via computational fluid dynamics and machine learning method

Zhao Jiantao,Pei Ji,Yuan Jianping,WANGWENJIE 한국CDE학회 2023 Journal of computational design and engineering Vol.10 No.3

To implement energy savings in multistage centrifugal pumps, a return channel is utilized to replace the origin inter-stage flow channel structure, and then a single-objective optimization work containing high-precision numerical simulation, design variable dimensionality reduction, and machine learning is conducted to obtain the optimal geometric parameters. The variable dimensionality reduction process is based on the Spearman correlation analysis method. The influence of 15 design variables of the impeller and return channel is investigated, and seven of them with high-impact factors are selected as the final optimization variables. Thereafter, a genetic algorithm-backpropagation neural network (GA-BPNN) model is used to create a surrogate model with a high-fitting performance by employing a GA to optimize the initial thresholds and weights of a BPNN. Finally, a multi-island genetic algorithm (MIGA) is employed to maximize hydraulic efficiency under the nominal condition. The findings demonstrate that the optimized model’s efficiency is increased by 4.29% at 1.0Qd, and the deterioration of the pump performance under overload conditions is effectively eliminated (the maximum efficiency increase is 14.72% at 1.3Qd). Furthermore, the internal flow analysis indicates that the optimization scheme can improve the turbulence kinetic energy distribution and reduce unstable flow structures in the multistage centrifugal pump.