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Fine-tuning cell organelle dynamics during mitosis by small GTPases

Frontiers of Medicine 2022, Volume 16, Issue 3, Pages 339-357 doi: 10.1007/s11684-022-0926-1

Abstract: During mitosis, the allocation of genetic material concurs with organelle transformation and distribution. The coordination of genetic material inheritance with organelle dynamics directs accurate mitotic progression, cell fate determination, and organismal homeostasis. Small GTPases belonging to the Ras superfamily regulate various cell organelles during division. Being the key regulators of membrane dynamics, the dysregulation of small GTPases is widely associated with cell organelle disruption in neoplastic and non-neoplastic diseases, such as cancer and Alzheimer’s disease. Recent discoveries shed light on the molecular properties of small GTPases as sophisticated modulators of a remarkably complex and perfect adaptors for rapid structure reformation. This review collects current knowledge on small GTPases in the regulation of cell organelles during mitosis and highlights the mediator role of small GTPase in transducing cell cycle signaling to organelle dynamics during mitosis.

Keywords： small GTPase cell organelle mitosis

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Variable identification and automatic tuning of the main module of a servo system of parallel mechanism

YANG Zhiyong, XU Meng, HUANG Tian, NI Yanbing

Frontiers of Mechanical Engineering 2007, Volume 2, Issue 1, Pages 82-88 doi: 10.1007/s11465-007-0014-x

Abstract: The variables of the main module of a servo system for miniature reconfigurable parallel mechanism were identified and automatically tuned. With the reverse solution module of the translation, the module with the exerted translation joint was obtained, which included the location, velocity and acceleration of the parallelogram carriage-branch. The rigid dynamic reverse model was set as the virtual work principle. To identify the variables of the servo system, the triangle-shaped input signal with variable frequency was adopted to overcome the disadvantages of the pseudo-random number sequence, i.e., making the change of the vibration amplitude of the motor dramatically, easily impact the servo motor and make the velocity loop open and so on. Moreover, all the variables including the rotary inertia of the servo system were identified by the additive mass. The overshoot and rise time were the optimum goals, the limited changing load with the attitude was considered, and the range of the controller variables in the servo system was identified. The results of the experiments prove that the method is accurate.

Keywords： acceleration reconfigurable parallel additive sequence parallel mechanism

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Task-space position/attitude tracking control of FAST fine tuning system

QI Lin, ZHANG Hui, DUAN Guanghong

Frontiers of Mechanical Engineering 2008, Volume 3, Issue 4, Pages 392-399 doi: 10.1007/s11465-008-0056-8

Abstract: This paper addresses the task-space position/attitude tracking control of a suspended parallel robot, which is being developed in the framework of a five-hundred meter aperture spherical radio telescope (FAST) project. Based on the quaternion algebra, a novel model-independent task-space PD controller that ensures end-effector position and attitude tracking is presented. The simulation and experimental results show that the new controller has better control effects than the traditional joint-space controller.

Keywords： telescope five-hundred end-effector controller simulation

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Isolating higher yielding and more stable rice genotypes in stress environments: fine-tuning a selection

Frontiers of Agricultural Science and Engineering doi: 10.15302/J-FASE-2023521

Abstract:

● Score index methods readily discriminate genotypes adapted to a target environment.

Keywords： Aerobic rice breeding selection drought resilience production capacity index resilience capacity index stress score index upland

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Tuning the catalytic selectivity in electrochemical CO

Jiafang XIE,Yuxi HUANG,Hanqing YU

Frontiers of Environmental Science & Engineering 2015, Volume 9, Issue 5, Pages 861-866 doi: 10.1007/s11783-014-0742-1

Abstract: By tuning the electrochemical parameters, either Cu oxide nanowires or nanoneedles were fabricated and

Keywords： electrochemical CO₂ reduction Cu oxide nanostructure selectivity hydrocarbon formation

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Tuning nitrogen defects and doping sulfur in carbon nitride for enhanced visible light photocatalytic

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 1, Pages 93-101 doi: 10.1007/s11705-022-2175-x

Abstract: Defect construction and heteroatom doping are effective strategies for improving photocatalytic activity of carbon nitride (g-C₃N₄). In this work, N defects were successfully prepared via cold plasma. High-energy electrons generated by plasma can produce N defects and embed sulfur atoms into g-C₃N₄. The N defects obviously promoted photocatalytic degradation performance that was 7.5 times higher than that of pure g-C₃N₄. The concentration of N defects can be tuned by different power and time of plasma. With the increase in N defects, the photocatalytic activity showed a volcanic trend. The g-C₃N₄ with moderate concentration of N defects exhibited the highest photocatalytic activity. S-doped g-C₃N₄ exhibited 11.25 times higher photocatalytic activity than pure g-C₃N₄. It provided extra active sites for photocatalytic reaction and improved stability of N defects. The N vacancy-enriched and S-doped g-C₃N₄ are beneficial for widening absorption edge and improving the separation efficiency of electron and holes.

Keywords： g-C₃N₄ nitrogen defect sulfur doping photodegradation plasma

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electro-reduction of nitrobenzene by the nano-structured Cu catalyst prepared by an electrodeposited method via tuning

Yali CHEN,Lu XIONG,Weikang WANG,Xing ZHANG,Hanqing YU

Frontiers of Environmental Science & Engineering 2015, Volume 9, Issue 5, Pages 897-904 doi: 10.1007/s11783-015-0782-1

Abstract: with different morphologies were fabricated on Ti plate using a facile electrodepositon method via tuning

Keywords： nitrobenzene nano-structured Cu electro-reduction voltage-dependent electrodeposition high selectivity high stability

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Rules Auto-conditioning Fuzzy Controller

Cheng Jin,Zhang Chenghui,Xia Dongwei

Strategic Study of CAE 2003, Volume 5, Issue 9, Pages 78-81

Abstract:

According to the fuzzy theory and practical experience, the authors propose a rules autoconditioning fuzzy controller, whose dynamic performance and stability are all prior to the conventional PID controller and the basic fuzzy controller. It is also shown that the controller has good disturbance rejection properties and insensitivity to plant parameter variations. Both simulation and engineering prove that it is feasible actually and convenient to put into practical control project.

Keywords： fuzzy controller rules auto-tuning adaptive

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Tuning porosity of coal-derived activated carbons for CO2 adsorption

Frontiers of Chemical Science and Engineering 2022, Volume 16, Issue 9, Pages 1345-1354 doi: 10.1007/s11705-022-2155-1

Abstract: A simple method was developed to tune the porosity of coal-derived activated carbons, which provided a model adsorbent system to investigate the volumetric CO₂ adsorption performance. Specifically, the method involved the variation of the activation temperature in a K₂CO₃ induced chemical activation process which could yield activated carbons with defined microporous (< 2 nm, including ultra-microporous < 1 nm) and meso-micro-porous structures. CO₂ adsorption isotherms revealed that the microporous activated carbon has the highest measured CO₂ adsorption capacity (6.0 mmol∙g^–1 at 0 °C and 4.1 mmol∙g^–1 at 25 °C), whilst ultra-microporous activated carbon with a high packing density exhibited the highest normalized capacity with respect to packing volume (1.8 mmol∙cm⁻³ at 0 °C and 1.3 mmol∙cm^–3 at 25 °C), which is significant. Both experimental correlation analysis and molecular dynamics simulation demonstrated that (i) volumetric CO₂ adsorption capacity is directly proportional to the ultra-micropore volume, and (ii) an increase in micropore sizes is beneficial to improve the volumetric capacity, but may lead a low CO₂ adsorption density and thus low pore space utilization efficiency. The adsorption experiments on the activated carbons established the criterion for designing CO₂ adsorbents with high volumetric adsorption capacity.

Keywords： coal-derived activated carbons porosity CO₂ adsorption molecular dynamics

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Tuning the primary selective nanochannels of MOF thin-film nanocomposite nanofiltration membranes for

Frontiers of Environmental Science & Engineering 2022, Volume 16, Issue 4, doi: 10.1007/s11783-021-1474-7

Abstract:

• PA layer properties tune the primary nanochannels in MIL-101(Cr) TFN NF membranes.

Keywords： Porous metal organic framework Thin-film nanocomposite membrane Primary selective nanochannels Nanofiltration Endocrine disrupting compounds

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Study on Temperature Control of Trace ContaminantControl Subassembly in Manned Spacecraft

Pang Liping,Wang Jun

Strategic Study of CAE 2007, Volume 9, Issue 4, Pages 60-63

Abstract: Temperature control in COA via a new self-tuning fuzzy logical controller (FLC)is analyzed in this paperThe new tuning method applies the bang-bang on-line tuned method to the design of the self-tuning FLCThen the proposed self-tuning FLC is realized by combining the scaling factors and the normal look-upIt can realize self-tuning parameters, and simplify the design.Simulation results show that the proposed self-tuning FLC is fit for controlling the temperature of COA

Keywords： manned spacecraft catalytic oxidizer temperature control fuzzy control self-tuning

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Principle of Laser Nano-meter Measurement Ruler

Zhang Shulian

Strategic Study of CAE 2005, Volume 7, Issue 3, Pages 27-34

Abstract: The principle is based on the frequency splitting, mode competition, cavity tuning, etc., of laser, which

Keywords： displacement measurement HeNe laser mode competition frequency splitting cavity tuning longitudinal mode

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Design of a fractional PI None

Pritesh SHAH, Sudhir AGASHE, Anand J. KULKARNI

Frontiers of Information Technology & Electronic Engineering 2018, Volume 19, Issue 3, Pages 437-445 doi: 10.1631/FITEE.1601495

Abstract: The cohort intelligence (CI) method has recently evolved as an optimization method based on artificial intelligence. We use the CI method for the first time to optimize the parameters of the fractional proportionalintegral-derivative (PID) controller. The performance of the CI method in designing the fractional PID controller was validated and compared with those of some other popular algorithms such as particle swarm optimization, the genetic algorithm, and the improved electromagnetic algorithm. The CI method yielded improved solutions in terms of the cost function, computing time, and function evaluations in comparison with the other three algorithms. In addition, the standard deviations of the CI method demonstrated the robustness of the proposed algorithm in solving control problems.

Keywords： Cohort intelligence Fractional calculus Fractional PID controller Tuning

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Tuning the electronic structure of NiCoP arrays through V doping for pH-universal hydrogen evolution

Yu Lin, Jinlei Wang, Duanlin Cao, Yaqiong Gong

Frontiers of Chemical Science and Engineering 2021, Volume 15, Issue 5, Pages 1134-1146 doi: 10.1007/s11705-020-2014-x

Abstract: The exploration of cost-effective, high-performance, and stable electrocatalysts for the hydrogen evolution reaction (HER) over wide pH range (0–14) is of paramount importance for future renewable energy conversion technologies. Regulation of electronic structure through doping vanadium atoms is a feasible construction strategy to enhance catalytic activities, electron transfer capability, and stability of the HER electrode. Herein, V-doped NiCoP nanosheets on carbon fiber paper (CFP) (denoted as V -NiCoP/CFP) were constructed by doping V modulation on NiCoP nanosheets on CFP and used for pH-universal HER. Benefiting from the abundant catalytic sites and optimized hydrogen binding thermodynamics, the resultant V -NiCoP/CFP demonstrates a significantly improved HER catalytic activity, requiring overpotentials of 46.5, 52.4, and 85.3 mV to reach a current density of 10 mA·cm in 1 mol·L KOH, 0.5 mol·L H SO , and 1 mol·L phosphate buffer solution (PBS) electrolytes, respectively. This proposed cation-doping strategy provides a new inspiration to rationally enhance or design new-type nonprecious metal-based, highly efficient, and pH-universal electrocatalysts for various energy conversion systems.

Keywords： hydrogen evolution reaction transition metal phosphides pH-universal vanadium doping carbon fiber paper

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Tuning of the active phase structure and hydrofining performance of alumina-supported tri-metallic WMoNi

Shufeng Shan, Haiyan Liu, Gang Shi, Xiaojun Bao

Frontiers of Chemical Science and Engineering 2018, Volume 12, Issue 1, Pages 59-69 doi: 10.1007/s11705-017-1686-3

Abstract: The effects of phosphorus on the structure and hydrofining performance of tri-metallic WMoNi/Al O catalysts prepared with W/Mo-based hybrid precursor nanocrystals were investigated. The incorporation of phosphorus weakened the metal-support interactions (MSIs) and facilitated the formation of more synergetic NiWMoS phases with higher stacks. Catalytic tests using a fluid catalytic cracking diesel fuel showed that the changes in the MSIs and the morphology of the active phases had a more positive effect on the hydrodenitrogenation activity than on the hydrodesulfurization activity. In contrast, when phosphorus was incorporated into a tri-metallic WMoNiP/Al O catalyst prepared by a conventional incipient impregnation method, the MSIs decreased causing aggregation of the metal species which resulted in poorer hydrofining performance of the catalyst. These results show that incorporating phosphorus into a WMoNi/Al O catalyst can finely tune the structure of the active phase to enhance the hydrogenation and hydrodenitrogenation activity of the resulting tri-metallic catalyst.

Keywords： fluid catalytic cracking diesel hydrofining performance WMoNiP/Al₂O₃ synergetic effect and structure of NiWMoS phases