Thoughts on China s Construction of Community of Shared Future for Mankind under the New Situation

Chen Ziwei,Liu Di 아시아사회과학학회 2021 Jornal of Asia Social Science Vol.3 No.2

On July 1, 2021, General Secretary Xi Jinping delivered an important speech at the conference celebrating the centenary of the founding of the Communist Party of China(CPC). 4The July 1st Speech is a programmatic document that fully exudes the charm of Marxism. It is a political declaration and action guide that stands at the historical intersection of the two centennial goals, focuses on the theme of realizing the great rejuvenation of the Chinese nation, learns from history, creates the future, and mobilizes and inspires us to move forward towards the goal of the second centennial. In the past 100 years, under the leadership of the Communist Party of China (CPC), and with the joint efforts of generations of Chinese people, we have witnessed the ambiguous Chinese Dream , which has gradually gained a clear outline. In the past one hundred years, the Communist Party of China(CPC) has created countless human miracles, and has set heavy footprints on the historical land. At the centenary of the founding of the Party, which is the node of the next century, how to presume the construction of human community is a major goal of our struggle.

Enhanced Formaldehyde Gas Sensing Properties of ZnO Nanosheets Modified with Graphene

Ziwei Chen,Yuyuan Hong,Zhidong Lin,Li-Ming Liu,Xiao-Wen Zhang 대한금속·재료학회 2017 ELECTRONIC MATERIALS LETTERS Vol.13 No.3

In this study, pure ZnO (ZnO-1, ZnO-2) with two different morphologies, andgraphene doped ZnO-2 (G-ZnO-2) were synthesized using a simplehydrothermal process at 150 °C. The formaldehyde gas sensing performanceof the G-ZnO-2 composite, synthesized by an in-situ method was investigated. The morphologies and the structures of the nanomaterials were characterizedby X-ray diffraction, field emission scanning electronic microscopy, andtransmission electron microscopy. The experimental results indicate that the GZnO-2 based sensor exhibits unique advantages for the sensing offormaldehyde gas at concentrations in the range of 2 to 2000 ppm, such as fastresponse/recovery time and good selectivity, at an optimal workingtemperature of 200 °C. The improved sensing performance of the G-ZnO-2composite indicates that the addition of graphene is effective in improving theformaldehyde sensing performance of ZnO-based sensors.

Effect of Gas Sensing Properties by Sn-Rh Codoped ZnO Nanosheets

Ziwei Chen,Zhidong Lin,Mengying Xu,Yuyuan Hong,Na Li,Ping Fu,Ze Chen 대한금속·재료학회 2016 ELECTRONIC MATERIALS LETTERS Vol.12 No.3

The hierarchically porous Sn-Rh codoped ZnO, Sn-doped ZnO and pureZnO nanosheets have been successfully synthesized through a simplehydrothermal reaction process without any surfactant or template at 180°C. The morphology and composition were carefully characterized by X-raydiffraction, energy dispersive X-ray spectrometer, field emission scanningelectronic microscopy and BET. The gas-sensing testing results indicatedthat the Sn-Rh codoped ZnO nanosheets, with the specific surface area was26.9 m2/g, exhibited enhanced gas-sensing performance compared withthat of pure ZnO and Sn-doped ZnO. The high sensitivity of the sensorbased on Sn-Rh codoped ZnO was 149.38 to 100 ppm ethanol and thedetection limit was less than 5 ppm (5.8). The response and recovery timeswere measured to be ~3 s and ~10 s when exposed to 100 ppm ethanol atthe test temperature of 300°C. The good sensing performance of the Sn-Rhcodoped ZnO sensor indicated that hierarchically porous Sn-Rh codopedZnO could be a promising candidate for highly sensitive gas sensors.

On the historicity of the development and evolution of the concept of globalization

Yang Peng(Peng Yang),Chen Ziwei(Ziwei Chen) 아시아사회과학학회 2022 Jornal of Asia Social Science Vol.8 No.1

Globalization is a world-class phenomenon, and it is the cross-border and cultural spread of factors such as the production of products, the application of technology, the dissemination of information, and jobs among different countries. Globalization is a widespread phenomenon that includes economic, political, social, cultural and legal factors. From the economic point of view, globalization explains the free trade in which different countries are interdependent through various forms. From the political point of view, the evolution of globalization is developing towards the structure of intergovernmental organizations, such as the WTO and the United Nations. From the social and cultural point of view, globalization makes the interaction and cultural exchange among ethnic groups closer. Globalization also represents the exchange and collision of cultural concepts, thoughts and artistic expressions among different regions. In addition, there is a general trend of globalization towards a single world culture. From the perspective of law, globalization has adjusted the construction and implementation of international law. In the author's opinion, globalization is not a new concept in recent decades. In ancient human society a long time ago, there were merchants who traveled long distances to another country and region, taking their hometown specialties for sale, or bringing overseas specialty products back to their hometown for sale. With the development of industrial revolution, it created a great leap in the development of transportation and communication means for human society in the 19th century, and also greatly reduced the difficulty of cross-border trade. Through a brief analysis of the historical evolution of economic globalization, political globalization and social and cultural globalization, this paper shows that globalization is the result of historical development in recent centuries, rather than a fresh product in recent decades.

The Vis-NIR multicolor emitting phosphor Ba4Gd3Na3(PO4)6F2: Eu2+, Pr3+ for LED towards plant growth

Ziwei Zhou,Niumiao Zhang,Jiayu Chen,Xianju Zhou,Maxim S. Molokeev,Chongfeng Guo 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.65 No.-

Photosynthesis process is the basic for plant growth, which needs energy from the light. The pigments of chlorophyll a, b and bacteriochlorophyll are responsible for the absorption of light, in which blue, red and near-infrared (NIR) light directly or indirectly promote the plant growth and enhancement of nurtiments. It is important for plant to support absorbable light, and phosphhor-converted light emitting diodes (pc-LEDs) are low-cost, energy-saving and enviromental friendly devices for plant growth. To develop a phosphor with emission covering the blue, red and NIR, a series of phosphors Ba4Gd3Na3(PO4)6F2: Eu2+, Pr3+ with blue, red and NIR multi-emitting were prepared. Their emissions not only match well with the absorption spectra of pigments in the plant, but also could be excited by near ultraviolet (n-UV) LED chip. The crystal structure of host Ba4Gd3Na3(PO4)6F2 was refined from the XRD data and three different crystallographic sites occupied by Eu2+ were determined through low temperature photoluminescence spectra. The energy transfer from Eu2+ to Pr3+ ions was also discussed in detail. Results indicated that the multi-emitting Ba4Gd3Na3(PO4)6F2: Eu2+, Pr3+ can serve as a phosphor candidate for plant growth LEDs.

Effect of Supplemental Lighting Source Combined with Intensity on Quality of Grafted Watermelon Plug Seedlings

Chen Liu,Hao Wei,Jiangtao Hu,Mengzhao Wang,Ziwei Guo,Byoung Ryong Jeong 한국원예학회 2018 한국원예학회 학술발표요지 Vol.2018 No.10

Anti-sparse representation for structural model updating using l∞ norm regularization

Ziwei Luo,Ling Yu,Huan-Lin Liu,Zexiang Chen 국제구조공학회 2020 Structural Engineering and Mechanics, An Int'l Jou Vol.75 No.4

Finite element (FE) model based structural damage detection (SDD) methods play vital roles in effectively locating and quantifying structural damages. Among these methods, structural model updating should be conducted before SDD to obtain benchmark models of real structures. However, the characteristics of updating parameters are not reasonably considered in existing studies. Inspired by the l∞ norm regularization, a novel anti-sparse representation method is proposed for structural model updating in this study. Based on sensitivity analysis, both frequencies and mode shapes are used to define an objective function at first. Then, by adding l∞ norm penalty, an optimization problem is established for structural model updating. As a result, the optimization problem can be solved by the fast iterative shrinkage thresholding algorithm (FISTA). Moreover, comparative studies with classical regularization strategy, i.e. the l2 norm regularization method, are conducted as well. To intuitively illustrate the effectiveness of the proposed method, a 2-DOF spring-mass model is taken as an example in numerical simulations. The updating results show that the proposed method has a good robustness to measurement noises. Finally, to further verify the applicability of the proposed method, a six-storey aluminum alloy frame is designed and fabricated in laboratory. The added mass on each storey is taken as updating parameter. The updating results provide a good agreement with the true values, which indicates that the proposed method can effectively update the model parameters with a high accuracy.

Effect of Difference between Day and Night Temperatures on Stem Elongation of Codonopsis lanceolata Seedlings

Ziwei Guo,Chen Liu,Yoo Gyeong Park,Xiuxia Ren,Byoung Ryong Jeong 한국원예학회 2019 한국원예학회 학술발표요지 Vol.2019 No.5

Effect of Photoperiod Provided by LEDs on Growth and Development of Grafted Watermelon Plug Seedlings

Liu Chen,Hao Wei,Jiangtao Hu,Ziwei Guo,Mengzhao Wang,Jin Zhao,Byoung Ryong Jeong 한국원예학회 2018 한국원예학회 학술발표요지 Vol.2018 No.5

Design and torque calculation of permanent magnet eddy current coupling with sinusoidal torque output

Ke Chen,Hongyang Shi,Yajun Guo,Lei Yin,Ziwei Bao,Hongmei Zheng 전력전자학회 2023 JOURNAL OF POWER ELECTRONICS Vol.23 No.4

Due to its unique characteristic of non-contact torque transmission between its permanent magnetic rotor and conductorrotor, permanent magnet eddy current coupling (PMECC) is preferable in transmitting torque from the outside to the insideof a sealed container, which can effectively avoid the tricky problem of dynamic seals. To mix non-uniform liquid solutionsor gas mixtures in sealed containers more effectively, a sinusoidal torque is also required. Thus, permanent magnet eddy current coupling with a slotted conductor is proposed in this paper, which can adaptively output sinusoidal torque under a real-time load when the input rotational speed is constant. Based on the equivalent magnetic circuit method, an analytical model for calculating torque is proposed. When establishing the equivalent magnetic circuit model of the PMECC, the radial magnetic flux leakage circuit is added to the equivalent magnetic circuit diagram, and the cross-sectional shape of the eddy current region is equivalent to an octagon, which simplifies the torque calculation process. The analytical model is verified by finite element method (FEM) simulation and experiments. According to a comparison, the peak and lowest values of output torque obtained by the experiments, the analytical model, and the FEM simulation are consistent. The output torque waveform obtained by the analytical model and FEM simulation are also consistent.