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Precision control system of two-DOF stage with linear ultrasonic motor

ZHANG Hanlei, SHI Yunlai, ZHAO Chunsheng

Frontiers of Mechanical Engineering 2008, Volume 3, Issue 4,   Pages 421-425 doi: 10.1007/s11465-008-0063-9

Abstract: Using an appropriate control method, linear ultrasonic motors can be used in applications requiring highIn this paper, a closed loop PI control system is designed to achieve high position accuracy during thecontrol of a two-DOF stage driven by linear ultrasonic motors.The PI control algorithm is used to increase the stability and accuracy of position control.Experimental results denote that the control strategy proposed in this paper appears to have high efficiency

Keywords： settling     position accuracy     PI control     control algorithm     orthogonal    

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Performance of PI controller for control of active and reactive power in DFIG operating in a grid-connected

Azzouz TAMAARAT,Abdelhamid BENAKCHA

Frontiers in Energy 2014, Volume 8, Issue 3,   Pages 371-378 doi: 10.1007/s11708-014-0318-6

Abstract: The objective of this work is to present the modeling and control strategy of a grid connected wind powerand simulation of a wind turbine driven DFIG in the second mode of operating (the wind turbine pitch controlIt will introduce the vector control, which makes it possible to control independently the active and(with stator flux or voltage orientation) with classical PI controllers.for some optimization criteria (energy efficiency and the robustness of the control).

Keywords： wind power     doubly fed induction generator (DFIG)     vector control     active power     reactive power     maximum power    

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Micro － blind mesh thermal control study and simulation of nano-satellite

Yang Juan,Li Yunze,Wang Jun

Strategic Study of Chinese Academy of Engineering 2008, Volume 10, Issue 7,   Pages 169-172

Abstract: The intelligent control strategy of micro-blind mesh' s drive is the key technology.dynamic characteristics model of the spherical nano-satellite was established.Based on the model,a fuzzy PIcontroller is superior to the fuzzy controller and PID controller in that the former works well with good control

Keywords： nano-satellite     micro-blind mesh     fuzzy PI controller     simulation    

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Modeling and control of a permanent magnet synchronous generator dedicated to standalone wind energy

Louar FATEH,Ouari AHMED,Omeiri AMAR,Djellad ABDELHAK,Bouras LAKHDAR

Frontiers in Energy 2016, Volume 10, Issue 2,   Pages 155-163 doi: 10.1007/s11708-016-0410-1

Abstract: The control of the permanent magnet synchronous generator (PMSG) can be affected with the implementationof various techniques of control.This paper presented a new approach mainly based on the control strategy of power production system basedtechniques, such as direct control of the torque (DTC) to control the load side converter (LSC), thecontrol of the speed of the turbine and the DC-bus voltage ensured by PI regulators.

Keywords： wind turbine     permanent magnet synchronous generator (PMSG)     converter     proportional-integral (PI)     control     direct control of the torque (DTC)     regulation    

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Review of 4Pi Fluorescence Nanoscopy Review

Xiang Hao, Yiming Li, Shuang Fu, Yanghui Li, Yingke Xu, Cuifang Kuang, Xu Liu

Engineering 2022, Volume 11, Issue 4,   Pages 146-153 doi: 10.1016/j.eng.2020.07.028

Abstract: An important milestone in this pursuit is the coherent utilization of two opposing objectives (4Pi geometryHerein, we review the recent progress in 4Pi nanoscopy, which provides a 3D, non-invasive, diffraction-unlimitedThis review includes both the targeted and stochastic switching modalities of 4Pi nanoscopy.The schematics, principles, applications, and future potential of 4Pi nanoscopy are discussed in detail

Keywords： Fluorescence nanoscopy     Super-resolution imaging     4Pi nanoscopy     IsoSTED     4Pi-SMLM    

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RGS16 regulated by let-7c-5p promotes glioma progression by activating PI3K-AKT pathway

Frontiers of Medicine   Pages 143-155 doi: 10.1007/s11684-022-0929-y

Abstract: Gliomas are the most common central nervous system tumours; they are highly aggressive and have a poor prognosis. RGS16 belongs to the regulator of G-protein signalling (RGS) protein family, which plays an important role in promoting various cancers, such as breast cancer, pancreatic cancer, and colorectal cancer. Moreover, previous studies confirmed that let-7c-5p, a well-known microRNA, can act as a tumour suppressor to regulate the progression of various tumours by inhibiting the expression of its target genes. However, whether RGS16 can promote the progression of glioma and whether it is regulated by miR let-7c-5p are still unknown. Here, we confirmed that RGS16 is upregulated in glioma tissues and that high expression of RGS16 is associated with poor survival. Ectopic deletion of RGS16 significantly suppressed glioma cell proliferation and migration both in vitro and in vivo. Moreover, RGS16 was validated as a direct target gene of miR let-7c-5p. The overexpression of miR let-7c-5p obviously downregulated the expression of RGS16, and knocking down miR let-7c-5p had the opposite effect. Thus, we suggest that the suppression of RGS16 by miR let-7c-5p can promote glioma progression and may serve as a potential prognostic biomarker and therapeutic target in glioma.

Keywords： RGS16     let-7c-5p     glioma     proliferation     migration    

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Ultraviolet-B induced expression of hypoxia-inducible factor 1α, transferrin receptor through EGFR/PI3K

LI Yanhua, BI Zhigang

Frontiers of Medicine 2007, Volume 1, Issue 1,   Pages 79-86 doi: 10.1007/s11684-007-0016-4

Abstract: Results showed that compared with control groups, UVB was able to induce HIF1α and TfR protein expressionThe EGFR/PI3K/AKT signaling pathway was required for the induction of HIF-1α and TfR expression inducedPI3K inhibitors, LY294002 and wortmannin, inhibited HIF-1?We conclude that UVB induces TfR and HIF-1αexpressions via EGFR/PI3K/AKT/DEC1 signaling pathway.
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THD reduction with reactive power compensation for fuzzy logic DVR based solar PV grid connected system

Akhil GUPTA,Saurabh CHANANA,Tilak THAKUR

Frontiers in Energy 2014, Volume 8, Issue 4,   Pages 464-479 doi: 10.1007/s11708-014-0307-9

Abstract: In this paper, a new control approach for the 200 kW solar photovoltaic grid connected system with perturbPower quality improvement with comparison is conducted during fault with proportional integral (PI) andtechnique and operation of fuzzy logic controlled DVR demonstrate the effectiveness of the proposed control

Keywords： fuzzy logic     maximum power point tracking (MPPT)     proportional integral (PI)     control     voltage restorer    

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Xiao Ke Qing improves glycometabolism and ameliorates insulin resistance by regulating the PI3K/Akt pathway

Xiaoqing Li, Xinxin Li, Genbei Wang, Yan Xu, Yuanyuan Wang, Ruijia Hao, Xiaohui Ma

Frontiers of Medicine 2018, Volume 12, Issue 6,   Pages 688-696 doi: 10.1007/s11684-018-0662-8

Abstract: Moreover, XKQ can ameliorate insulin resistance and upregulate the expression of IRS-1, PI3K (p85), p-AktXKQ is an effective drug for T2DM by ameliorating insulin resistance and regulating the PI3K/Akt signaling

Keywords： XKQ     type 2 diabetes mellitus     KKAy mice     PI3K/Akt pathway     diabetic liver disease    

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Effects of mulching for water conservation on soil carbon, nitrogen and biological properties

Xiaomin PI, Tongxun ZHANG, Benhua SUN, Quanhong CUI, Yun GUO, Mingxia GAO, Hao FENG, David W.

Frontiers of Agricultural Science and Engineering 2017, Volume 4, Issue 2,   Pages 146-154 doi: 10.15302/J-FASE-2017136

Abstract: The effect of mulching with straw, white plastic film and black plastic film for improving soil water storage and on the soil properties was examined in a wheat-maize rotation system on Loess soil in northwestern China. All the mulches improved the water storage to some extent and led to warmer soils. However, the organic C and total N contents of the soils declined significantly under the mulches, particularly the plastic film mulches, and this could have long-term detrimental effects on soil quality and the sustainability of the some mulching practices.

Keywords： biomass     carbon     mulch     nitrogen     plastic films     soil     straw     water storage    

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A 3D porous WP2 nanosheets@carbon cloth flexible electrode for efficient electrocatalytic hydrogen evolution

Mingyu Pi, Xiaodeng Wang, Dingke Zhang, Shuxia Wang, Shijian Chen

Frontiers of Chemical Science and Engineering 2018, Volume 12, Issue 3,   Pages 425-432 doi: 10.1007/s11705-018-1726-7

Abstract:

Self-standing porous WP2 nanosheet arrays on carbon fiber cloth (WP2 NSs/CC) were synthesized and used as a 3D flexible hydrogen evolution electrode. Because of its 3D porous nanoarray structure, the WP2 NSs/CC exhibits a remarkable catalytic activity and a high stability. By using the experimental measurements and first-principle calculations, the underlying reasons for the excellent catalytic activity were further explored. Our work makes the present WP2 NSs as a promising electrocatalyst for hydrogen evolution and provides a way to design and fabricate efficient hydrogen evolution electrodes through 3D porous nano-arrays architecture.

Keywords： WP2     nanosheet arrays     hydrogen evolution electrocatalyst     flexible electrode    

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Differences in Immunoglobulin G Glycosylation Between Influenza and COVID-19 Patients

Marina Kljaković-Gašpić Batinjan,Tea Petrović,Frano Vučković,Irzal Hadžibegović,Barbara Radovani,Ivana

Engineering doi: 10.1016/j.eng.2022.08.007

Abstract: The essential role of immunoglobulin G (IgG) in immune system regulation and combatting infectious diseases cannot be fully recognized without an understanding of the changes in its N-glycans attached to the asparagine 297 of the Fc domain that occur under such circumstances. These glycans impact the antibody stability, half-life, secretion, immunogenicity, and effector functions. Therefore, in this study, we analyzed and compared the total IgG glycome—at the level of individual glycan structures and derived glycosylation traits (sialylation, galactosylation, fucosylation, and bisecting N-acetylglucosamine (GlcNAc))—of 64 patients with influenza, 77 patients with coronavirus disease 2019 (COVID-19), and 56 healthy controls. Our study revealed a significant decrease in IgG galactosylation, sialylation, and bisecting GlcNAc (where the latter shows the most significant decrease) in deceased COVID-19 patients, whereas IgG fucosylation was increased. On the other hand, IgG galactosylation remained stable in influenza patients and COVID-19 survivors. IgG glycosylation in influenza patients was more time-dependent: In the first seven days of the disease, sialylation increased and fucosylation and bisecting GlcNAc decreased; in the next 21 days, sialylation decreased and fucosylation increased (while bisecting GlcNAc remained stable). The similarity of IgG glycosylation changes in COVID-19 survivors and influenza patients may be the consequence of an adequate immune response to enveloped viruses, while the observed changes in deceased COVID-19 patients may indicate its deviation.

Keywords： Influenza     COVID-19     Viral infection     Glycosylation     Immunoglobulin G     Pneumonia    

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PASS - BDI Model for Software Agent

Fan Wei,Chen Zengqiang,Yuan Zhuzhi

Strategic Study of Chinese Academy of Engineering 2004, Volume 6, Issue 6,   Pages 43-49

Abstract: model named as PASS-BDI, describes the mental states, cognitive processes and whole behaviors with pi-calculus

Keywords： agent     pi-calculus     cognitive processes     mental state    

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Structural parameter design method for a fast-steering mirror based on a closed-loop bandwidth

Guozhen CHEN, Pinkuan LIU, Han DING

Frontiers of Mechanical Engineering 2020, Volume 15, Issue 1,   Pages 55-65 doi: 10.1007/s11465-019-0545-y

Abstract: In accordance with the transfer function, the notch filter and proportional-integral (PI) feedback controllerThe gains of the PI controller are determined by maximizing the closed-loop bandwidth while ensuring

Keywords： fast-steering mirror     structural parameter     PI controller     bandwidth     notch filter    

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LAND-USE INTENSIFICATION TRENDS IN THE RIO DE LA PLATA REGION OF SOUTH AMERICA: TOWARD SPECIALIZATION OR RECOUPLING CROP AND LIVESTOCK PRODUCTION

POSSELT MARTINS, Sebastian VILLARINO, Júlio Kuhn DA TRINDADE, Pedro Arthur DE ALBUQUERQUE NUNES, Gervasio PIÑEIRO

Frontiers of Agricultural Science and Engineering 2021, Volume 8, Issue 1,   Pages 97-110 doi: 10.15302/J-FASE-2020380

Abstract: The Rio de la Plata region comprises central Argentina, Uruguay, and southern Brazil. Modern agriculture developed around 1900 with recent decades being characterized by the advance of cropping areas over native grasslands. Highly specialized agriculture has decoupled crop and livestock production but has succeeded in intensifying yields. However, significant losses of ecosystem services have been reported. Thus, questions have been raised on the sustainability of this pathway. A glance at world regions that have experienced similar trends suggests that an urgent course correction is needed. A major concern has been the lack of diversity in regions with highly specialized agriculture, promoting renewed interest in integrated crop-livestock systems (ICLS), not only because ICLS are more diverse than specialized systems, but also because they are rare examples of reconciliation between agroecosystem intensification and environmental quality. Consequently, this paper discusses alternatives to redesign multifunctional landscapes based on ICLS. Recent data provide evidence that recoupling crop and animal production increases the resilience of nutrient cycling functions and economic indicators to external stressors, enabling these systems to face climate-market uncertainty and reconcile food production with the provision of diverse ecosystem services. Finally, these concepts are exemplified in case studies where this perspective has been successfully applied.

Keywords： grazing     integrated crop-livestock systems     mixed crops-livestock     Pampa    

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Title Author Date Type Operation

Precision control system of two-DOF stage with linear ultrasonic motor

ZHANG Hanlei, SHI Yunlai, ZHAO Chunsheng

Journal Article

Performance of PI controller for control of active and reactive power in DFIG operating in a grid-connected

Azzouz TAMAARAT,Abdelhamid BENAKCHA

Journal Article

Micro － blind mesh thermal control study and simulation of nano-satellite

Yang Juan,Li Yunze,Wang Jun

Journal Article

Modeling and control of a permanent magnet synchronous generator dedicated to standalone wind energy

Louar FATEH,Ouari AHMED,Omeiri AMAR,Djellad ABDELHAK,Bouras LAKHDAR

Journal Article

Review of 4Pi Fluorescence Nanoscopy

Xiang Hao, Yiming Li, Shuang Fu, Yanghui Li, Yingke Xu, Cuifang Kuang, Xu Liu

Journal Article

RGS16 regulated by let-7c-5p promotes glioma progression by activating PI3K-AKT pathway

Journal Article

Ultraviolet-B induced expression of hypoxia-inducible factor 1α, transferrin receptor through EGFR/PI3K

LI Yanhua, BI Zhigang

Journal Article

THD reduction with reactive power compensation for fuzzy logic DVR based solar PV grid connected system

Akhil GUPTA,Saurabh CHANANA,Tilak THAKUR

Journal Article

Xiao Ke Qing improves glycometabolism and ameliorates insulin resistance by regulating the PI3K/Akt pathway

Xiaoqing Li, Xinxin Li, Genbei Wang, Yan Xu, Yuanyuan Wang, Ruijia Hao, Xiaohui Ma

Journal Article

Effects of mulching for water conservation on soil carbon, nitrogen and biological properties

Xiaomin PI, Tongxun ZHANG, Benhua SUN, Quanhong CUI, Yun GUO, Mingxia GAO, Hao FENG, David W.

Journal Article

A 3D porous WP2 nanosheets@carbon cloth flexible electrode for efficient electrocatalytic hydrogen evolution

Mingyu Pi, Xiaodeng Wang, Dingke Zhang, Shuxia Wang, Shijian Chen

Journal Article

Differences in Immunoglobulin G Glycosylation Between Influenza and COVID-19 Patients

Marina Kljaković-Gašpić Batinjan,Tea Petrović,Frano Vučković,Irzal Hadžibegović,Barbara Radovani,Ivana

Journal Article

PASS - BDI Model for Software Agent

Fan Wei,Chen Zengqiang,Yuan Zhuzhi

Journal Article

Structural parameter design method for a fast-steering mirror based on a closed-loop bandwidth

Guozhen CHEN, Pinkuan LIU, Han DING

Journal Article

LAND-USE INTENSIFICATION TRENDS IN THE RIO DE LA PLATA REGION OF SOUTH AMERICA: TOWARD SPECIALIZATION OR RECOUPLING CROP AND LIVESTOCK PRODUCTION

POSSELT MARTINS, Sebastian VILLARINO, Júlio Kuhn DA TRINDADE, Pedro Arthur DE ALBUQUERQUE NUNES, Gervasio PIÑEIRO

Journal Article