In this paper, to complete the global dynamics of a multi-strains SIS epidemic model, we establish a precise result on coexistence for the cases of the partial and complete duplicated multiple largest reproduction rat...In this paper, to complete the global dynamics of a multi-strains SIS epidemic model, we establish a precise result on coexistence for the cases of the partial and complete duplicated multiple largest reproduction ratios for this model.展开更多
Ge/SiGe heterostructure quantum wells play a pivotal role in the pursuit of scalable silicon-based qubits.The varying compressive strains within these quantum wells profoundly influence the physical characteristics of...Ge/SiGe heterostructure quantum wells play a pivotal role in the pursuit of scalable silicon-based qubits.The varying compressive strains within these quantum wells profoundly influence the physical characteristics of the qubits,yet this factor remains largely unexplored,driving our research endeavor.In this study,we utilized RP-CVD(Reduced Pressure Chemical Vapor Deposition)to grow Ge quantum wells with varied compressive strain,proposing growth schemes for lightly-strained(ε∥=-0.43%)QW(quantum well),standard-strained(ε∥=-0.61%)QW,and heavily-strained(ε∥=-1.19%)QW.Through comprehensive material characterization,particularly employing the low-temperature magneto-transport measurements,we derived the percolation densities ranging from 4.7×10^(10) to 14.2×10^(10) cm^(-2) and mobilities from 3.382×10^(5) to 7.301×10^(5) cm^(2)∙V^(-1)∙s^(-1).Combined with the first-principles calculations,our analysis delves into the trends in effective mass and percolation density at low temperatures,shedding light on the impact of quantum effects on band structures and the interplay between structural components and wave functions.This research offers a comprehensive investigation into the intrinsic mechanisms governing complex multi-strained quantum wells,spanning growth,characterization,and computational perspectives,thereby establishing a strategy for the growth of high-quality strained quantum wells.展开更多
The widespread use of polymers has made our lives increasingly convenient by offering a more convenient and dependable material.However,the challenge of efficiently decomposing these materials has resulted in a surge ...The widespread use of polymers has made our lives increasingly convenient by offering a more convenient and dependable material.However,the challenge of efficiently decomposing these materials has resulted in a surge of polymer waste,posing environment and health risk.Currently,landfill and incineration treatment approaches have notable shortcomings,prompting a shift towards more eco-friendly and sustainable biodegradation approaches.Biodegradation primarily relies on microorganisms,with research focusing on both solitary bacterial strain and multi-strain communities for polymer biodegradation.Furthermore,directed evolution and rational design of enzyme have significantly contributed to the polymer biodegradation process.However,previous reviews often undervaluing the role of multi-strain communities.In this review,we assess the current state of these three significant fields of research,provide practical solutions to issues with polymer biodegradation,and outline potential future directions for the subject.Ultimately,biodegradation,whether facilitated by single bacteria,multi-strain communities,or engineered enzymes,now represents the most effective method for managing waste polymers.展开更多
文摘In this paper, to complete the global dynamics of a multi-strains SIS epidemic model, we establish a precise result on coexistence for the cases of the partial and complete duplicated multiple largest reproduction ratios for this model.
基金supported by the Innovation Program for Quantum Science and Technology (Project ID.2021ZD0302301)the National Natural Science Foundation of China (Grant No.6240033549).
文摘Ge/SiGe heterostructure quantum wells play a pivotal role in the pursuit of scalable silicon-based qubits.The varying compressive strains within these quantum wells profoundly influence the physical characteristics of the qubits,yet this factor remains largely unexplored,driving our research endeavor.In this study,we utilized RP-CVD(Reduced Pressure Chemical Vapor Deposition)to grow Ge quantum wells with varied compressive strain,proposing growth schemes for lightly-strained(ε∥=-0.43%)QW(quantum well),standard-strained(ε∥=-0.61%)QW,and heavily-strained(ε∥=-1.19%)QW.Through comprehensive material characterization,particularly employing the low-temperature magneto-transport measurements,we derived the percolation densities ranging from 4.7×10^(10) to 14.2×10^(10) cm^(-2) and mobilities from 3.382×10^(5) to 7.301×10^(5) cm^(2)∙V^(-1)∙s^(-1).Combined with the first-principles calculations,our analysis delves into the trends in effective mass and percolation density at low temperatures,shedding light on the impact of quantum effects on band structures and the interplay between structural components and wave functions.This research offers a comprehensive investigation into the intrinsic mechanisms governing complex multi-strained quantum wells,spanning growth,characterization,and computational perspectives,thereby establishing a strategy for the growth of high-quality strained quantum wells.
基金supported by the National Natural Science Foundation of China(22078011,21908003,and 32022002)the National Key Research and Development Program of China(2021YFC2100600)+1 种基金the seed funding of China Petrochemical Corporation(Sinopec Group)(223260)the Fundamental Research Funds for the Central Universities(QNTD2023-01).
文摘The widespread use of polymers has made our lives increasingly convenient by offering a more convenient and dependable material.However,the challenge of efficiently decomposing these materials has resulted in a surge of polymer waste,posing environment and health risk.Currently,landfill and incineration treatment approaches have notable shortcomings,prompting a shift towards more eco-friendly and sustainable biodegradation approaches.Biodegradation primarily relies on microorganisms,with research focusing on both solitary bacterial strain and multi-strain communities for polymer biodegradation.Furthermore,directed evolution and rational design of enzyme have significantly contributed to the polymer biodegradation process.However,previous reviews often undervaluing the role of multi-strain communities.In this review,we assess the current state of these three significant fields of research,provide practical solutions to issues with polymer biodegradation,and outline potential future directions for the subject.Ultimately,biodegradation,whether facilitated by single bacteria,multi-strain communities,or engineered enzymes,now represents the most effective method for managing waste polymers.
