An innovative hardware emulated simple passive semi-active controller for vibration control of MR dampers

Zhang, Jianqiu,Agrawal, Anil K. Techno-Press 2015 Smart Structures and Systems, An International Jou Vol.15 No.3

Magneto-Rheological (MR) dampers are being used increasingly because of their adaptability to control algorithms and reliability of passive systems. In this paper, an extensive investigation on performance of MR dampers in semi-active and passive modes has been carried out. It is observed that the overall energy dissipation by MR dampers in passive-on modes is higher than that in semi-active modes for most of the competitive semi-active controllers. Based on the energy dissipation pattern, a novel semi-active controller, termed as "Simple Passive Semi-Active Controller", has been proposed for MR dampers. This controller can be emulated by a simple passive hardware proposed in this paper. The proposed concept of controller "hardware emulation" is innovative and can also be implemented for other semi-active devices for control algorithms of certain form. The effectiveness and reliability of the proposed controller has been investigated extensively through numerical simulations. It has been demonstrated that the proposed controller is competitive to or more effective than other widely used / investigated semi-active controllers.

An innovative hardware emulated simple passive semi-active controller for vibration control of MR dampers

Jianqiu Zhang,Anil K. Agrawal 국제구조공학회 2015 Smart Structures and Systems, An International Jou Vol.15 No.3

Magneto-Rheological (MR) dampers are being used increasingly because of their adaptability tocontrol algorithms and reliability of passive systems. In this paper, an extensive investigation onperformance of MR dampers in semi-active and passive modes has been carried out. It is observed that theoverall energy dissipation by MR dampers in passive-on modes is higher than that in semi-active modes formost of the competitive semi-active controllers. Based on the energy dissipation pattern, a novel semi-activecontroller, termed as “Simple Passive Semi-Active Controller”, has been proposed for MR dampers. Thiscontroller can be emulated by a simple passive hardware proposed in this paper. The proposed concept ofcontroller “hardware emulation” is innovative and can also be implemented for other semi-active devices forcontrol algorithms of certain form. The effectiveness and reliability of the proposed controller has beeninvestigated extensively through numerical simulations. It has been demonstrated that the proposedcontroller is competitive to or more effective than other widely used / investigated semi-active controllers.

Effects of Surface Machining by a Lathe on Microstructure of Near Surface Layer and Corrosion Behavior of SA182 Grade 304 Stainless Steel in Simulated Primary Water

( Zhiming Zhang ),( Jianqiu Wang ),( En-hou Han ),( Wei Ke ) 한국부식방식학회(구 한국부식학회) 2019 Corrosion Science and Technology Vol.18 No.1

To find proper lathe machining parameters for SA182 Grade 304 stainless steel (SS), six kinds of samples with different machining surface states were prepared using a lathe. Surface morphologies and microstructures of near surface deformed layers on different samples were analysed. Surface morphologies and chemical composition of oxide films formed on different samples in simulated primary water with 100 μg/L O₂ at 310 ℃ were characterized. Results showed that surface roughness was mainly affected by lathe feed. Surface machining caused grain refinement at the top layer. A severely deformed layer with different thicknesses formed on all samples. In addition to high defect density caused by surface deformation, phase transformation, residual stress, and strain also affected the oxidation behaviour of SA182 Grade 304 SS in the test solution. Machining parameters used for # 4 (feed, 0.15 mm/r; back engagement, 2 mm; cutting speed, 114.86 m/min) and # 6 (feed,0.20 mm/r; back engagement, 1 mm; cutting speed, 73.01 m/min) samples were found to be proper for lathe machining of SA182 Grade 304 SS.

Sustaining Low-Carbon Emission Development: An Energy Efficient Transportation Plan for CPEC

Zubedi, Asma,Jianqiu, Zeng,Arain, Qasim Ali,Memon, Imran,Khan, Sehrish,Khan, Muhammad Saad,Zhang, Ying Korea Information Processing Society 2018 Journal of information processing systems Vol.14 No.2

Climate change has become a major challenge for sustainable development of human society. This study is an attempt to analyze existing literature to identify economic indicators that hamper the process of global warming. This paper includes case studies based on various countries to examine the nexus for environment and its relationship with Foreign Direct Investment, transportation, economic growth and energy consumption. Furthermore, the observations are analyzed from the perspective of China-Pakistan Economic Corridor (CPEC) and probable impact on carbon emission of Pakistan. A major portion of CPEC investment is allocated for transportation. However, it is evident that transportation sector is substantial emitter of carbon dioxide (CO2) gas. Unfortunately, there is no empirical work on the subject of CPEC and carbon emission for vehicular transportation. This paper infers that empirical results from various other countries are ambiguous and inconclusive. Moreover, the evidence for the pollution haven hypothesis and the halo effect hypothesis is limited in general and inapplicable for CPEC in particular. The major contribution of this study is the proposal of an energy efficient transportation model for reducing CO2 emission. In the end, the paper suggests strategies to climate researchers and policymakers for adaptation and mitigation of greenhouse gases (GHG).

Sustaining Low-Carbon Emission Development: An Energy Efficient Transportation Plan for CPEC

( Asma Zubedi ),( Zeng Jianqiu ),( Qasim Ali Arain ),( Imran Memon ),( Sehrish Khan ),( Muhammad Saad Khan ),( Ying Zhang ) 한국정보처리학회 2018 Journal of information processing systems Vol.14 No.2

Climate change has become a major challenge for sustainable development of human society. This study is an attempt to analyze existing literature to identify economic indicators that hamper the process of global warming. This paper includes case studies based on various countries to examine the nexus for environment and its relationship with Foreign Direct Investment, transportation, economic growth and energy consumption. Furthermore, the observations are analyzed from the perspective of China-Pakistan Economic Corridor (CPEC) and probable impact on carbon emission of Pakistan. A major portion of CPEC investment is allocated for transportation. However, it is evident that transportation sector is substantial emitter of carbon dioxide (CO2) gas. Unfortunately, there is no empirical work on the subject of CPEC and carbon emission for vehicular transportation. This paper infers that empirical results from various other countries are ambiguous and inconclusive. Moreover, the evidence for the pollution haven hypothesis and the halo effect hypothesis is limited in general and inapplicable for CPEC in particular. The major contribution of this study is the proposal of an energy efficient transportation model for reducing CO2 emission. In the end, the paper suggests strategies to climate researchers and policymakers for adaptation and mitigation of greenhouse gases (GHG).

Differences in the gut microbiota between Cercopithecinae and Colobinae in captivity

Zongjin Huan,Yongfang Yao,Jianqiu Yu,Hongwei Chen,Meirong Li,Chaojun Yang,Bo Zhao,Qingyong Ni,Mingwang Zhang,Meng Xie,Huailiang Xu 한국미생물학회 2020 The journal of microbiology Vol.58 No.5

The gut microbiome of captive primates can provide a window into their health and disease status. The diversity and composition of gut microbiota are influenced by not only host phylogeny, but also host diet. Old World monkeys (Cercopithecidae) are divided into two subfamilies: Cercopithecinae and Colobinae. The diet and physiological digestive features differ between these two subfamilies. Accordingly, highthroughput sequencing was used to examine gut microbiota differences between these two subfamilies, using data from 29 Cercopithecinae individuals and 19 Colobinae individuals raised in captivity. Through a comparative analysis of operational taxonomic units (OTUs), significant differences in the diversity and composition of gut microbiota were observed between Cercopithecinae and Colobinae. In particular, the gut microbiota of captive Old World monkeys clustered strongly by the two subfamilies. The Colobinae microbial diversity was higher than that of Cercopithecinae. Additionally, Firmicutes, Lactobacillaceae, Veillonellaceae, and Prevotella abundance were higher in Cercopithecinae, while Bacteroidetes, Ruminococcaceae, Christensenellaceae, Bacteroidaceae, and Acidaminococcaceae abundance were higher in Colobinae. PICRUSt analysis revealed that the predicted metagenomes of metabolic pathways associated with proteins, carbohydrates, and amino acids were significantly higher in Colobinae. In the context of host phylogeny, these differences between Cercopithecinae and Colobinae could reflect adaptations associated with their respective diets. This well-organized dataset is a valuable resource for future related research on primates and gut microbiota. Moreover, this study may provide useful insight into animal management practices and primate conservation.

Low-Complexity Hybrid Adaptive Blind Equalization Algorithm for High-Order QAM Signals

( Wei Rao ),( Changlong Lu ),( Yuanyuan Liu ),( Jianqiu Zhang ) 한국인터넷정보학회 2016 KSII Transactions on Internet and Information Syst Vol.10 No.8

It is well known that the constant modulus algorithm (CMA) presents a large steady-state mean-square error (MSE) for high-order quadrature amplitude modulation (QAM) signals. In this paper, we propose a low-complexity hybrid adaptive blind equalization algorithm, which augments the CMA error function with a novel constellation matched error (CME) term. The most attractive advantage of the proposed algorithm is that it is computationally simpler than concurrent CMA and soft decision-directed (SDD) scheme (CMA+SDD), and modified CMA (MCMA), while the approximation of steady-state MSE of the proposed algorithm is same with CMA+SDD, and lower than MCMA. Extensive simulations demonstrate the performance of the proposed algorithm.

Ultrafast Channel II process induced by a 3-D texture with enhanced acceptor order ranges for high-performance non-fullerene polymer solar cells

Chen, Shanshan,Lee, Sang Myeon,Xu, Jianqiu,Lee, Jungho,Lee, Kyu Cheol,Hou, Tianyu,Yang, Yankang,Jeong, Mingyu,Lee, Byongkyu,Cho, Yongjoon,Jung, Sungwoo,Oh, Jiyeon,Zhang, Zhi-Guo,Zhang, Chunfeng,Xiao, The Royal Society of Chemistry 2018 ENERGY AND ENVIRONMENTAL SCIENCE Vol.11 No.9

<P>To achieve efficient non-fullerene polymer solar cells (NF-PSCs), an in-depth understanding of the key properties that govern the power output is necessary. Herein, three trialkylsilyl substituted benzodithiophene-based polymer donors (PJ1, PJ2, and PJ3) were synthesized with fine-tuning of the highest occupied molecular orbital (HOMO)/lowest unoccupied molecular orbital (LUMO) and optical absorption. Using the polymer series paired with absorption-complementary small molecular acceptors (SMAs), namely, <I>m</I>-ITIC, IDIC, and AIDIC, we systematically studied the performance of a 3 × 3 matrix of NF-PSCs. An increasing open-circuit voltage with deepening HOMOs of the polymer donors, and the enhanced short-circuit current (<I>J</I>SC) and fill factor (FF) were ascribed to the well-intermixed blend morphology containing enhanced SMA order ranges with mixed face-on and edge-on orientations, the so-called 3-D texture. Such an optimal microstructure is best exemplified in the PJ2:IDIC combination, affording a highest efficiency of 12.01% with a simultaneously high <I>J</I>SC of 17.0 mA cm<SUP>−2</SUP> and FF of 75.3%. The devices with an active layer thickness of 300 nm still maintain an impressive efficiency approaching 10% with a decent FF of 60.0%. Moreover, the Channel II process, <I>i.e.</I>, photoinduced hole transfer through acceptor excitation, was demonstrated to be crucially important for photocurrent generation. This study highlights the importance of optimizing the trade-off between charge separation/transport and domain size to achieve high-performance NF-PSCs.</P>

Insights into constitutional isomeric effects on donor-acceptor intermolecular arrangements in non-fullerene organic solar cells

Lee, Jungho,Go, Eun Min,Dharmapurikar, Satej,Xu, Jianqiu,Lee, Sang Myeon,Jeong, Mingyu,Lee, Kyu Cheol,Oh, Jiyeon,Cho, Yongjoon,Zhang, Chunfeng,Xiao, Min,Kwak, Sang Kyu,Yang, Changduk The Royal Society of Chemistry 2019 Journal of Materials Chemistry A Vol.7 No.31

<P>Donor-acceptor intermolecular interactions and/or arrangements are key factors determining the performance of organic solar cells (OSCs). Herein, two ITIC-based isomeric acceptors (<I>o</I>-F-ITIC and <I>m</I>-F-ITIC) with fluorine atoms at <I>ortho</I> and <I>meta</I> positions within the side chains were developed. The developed acceptors showed different interactions and/or arrangements with the donor counterpart (PBDB-T), which caused a significant variation in the power conversion efficiency (PCE) of OSCs. The PCE of the PBDB-T:<I>o</I>-F-ITIC device was 11.11% <I>versus</I> 8.90% of the PBDB-T:<I>m</I>-F-ITIC device. A detailed theoretical analysis of the intermolecular complexes formed between F-ITICs and PBDB-T allows a determination of how the two isomeric acceptors interact differently with PBDB-T. Relative to PBDB-T:<I>m</I>-F-ITIC with a preferential DCI-BDD complex, PBDB-T:<I>o</I>-F-ITIC showed a closer donor-acceptor interaction, with a tightly packed parallel-like DCI-BDT complex, resulting in larger interfacial areas. These behavioral characteristics explain in detail the experimental results obtained from the comparison of the two blend systems relating to electrical and morphological properties. Moreover, transient absorption spectroscopy of PBDB-T:<I>o</I>-F-ITIC revealed superior hole/electron transfer and separation processes, providing further evidence of the presence of beneficial intermolecular complexes. This study facilitates the understanding of the role of constitutional isomerism both in intermolecular interactions and in promoting the development of high-performance OSCs.</P>