Covalent organic framework （COF） is a porous material with low density and large BET （Brtmauer-Emmett-Teller） surface area. They have great potential in gas adsorption and separation. In this work, the adsorption ...Covalent organic framework （COF） is a porous material with low density and large BET （Brtmauer-Emmett-Teller） surface area. They have great potential in gas adsorption and separation. In this work, the adsorption of pure CO2 and CO2/CH4 mixture on modified COF-102 was simulated by using GCMC （grand canonical Monte Carlo）. Metal Li was incorporated into COF-102 through three doping methods, including charge exchange, O^--Li6＋ dipolar interaction and O^--Li^＋ chemical bonding. The influence of Li doping on the adsorption of CO2 was studied. The results showed that among the three methods, the dipole doping is the best way to improve CO2 adsorption performance. Further, the ligands of COF-102 were replaced by extended aromatic moieties, such as diphenyl and pyrene. The adsorption capacity of CO2 and CH4, and the selectivity of CO2/CH4 on the ligand-replaced COF-102 were studied. The capacity of CO2 and CH4 on the ligand-replaced COF-102 had obvious changes; hence the selectivity of CO2/CH4 can be adjusted accordingly.展开更多
A scoping review was conducted to report on the nature and extent of the literature addressing the transition through peri and post retirement for people living with chronic disorder（s）. The secondary purpose was to...A scoping review was conducted to report on the nature and extent of the literature addressing the transition through peri and post retirement for people living with chronic disorder（s）. The secondary purpose was to determine the extent that gender issues and the transition age （50-65） are specifically addressed. Of 3,256 titles identified, 111 articles meet the inclusion criteria. Information was often indirect but addressed varying health domains that significantly influence transitional stages toward retirement and illustrating the burden of chronic comorbid health problems, unequal gender positions with differences in labour force participation, retirement pensions, and changing social dynamics. Few studies directly addressed the complex interaction of chronic health outcomes, psychological well-being, social and financial health as a significant paradigm in determining a successful transition into retirement. Needed are prospective longitudinal studies that measure predictors and outcomes of retirement transitioning along with qualitative studies that define the decision-making process. Given the substantial differential impact in respect to retirement risk factors and opportunities, there must be consideration in design and analysis for future high quality research.展开更多
In this paper, we consider a modified Leslie-Clower predator prey model with Holling- type II schemes and mutual interference. By applying the comparison theorem of the differential equation and constructing a suitabl...In this paper, we consider a modified Leslie-Clower predator prey model with Holling- type II schemes and mutual interference. By applying the comparison theorem of the differential equation and constructing a suitable Lyapunov function, sufficient conditions which guarantee the permanence and existence of a unique globally attractive positive almost periodic solution of the system are obtained. Our results not only supplement but also improve some existing ones.展开更多
The Backlund transformation（BT） of the m Kd V-s G equation is constructed by introducing a new transformation. Infinitely many nonlocal symmetries are obtained in terms of its BT. The soliton-periodic wave interacti...The Backlund transformation（BT） of the m Kd V-s G equation is constructed by introducing a new transformation. Infinitely many nonlocal symmetries are obtained in terms of its BT. The soliton-periodic wave interaction solutions are explicitly derived by the classical Lie-group reduction method. Particularly, some special concrete soliton and periodic wave interaction solutions and their behaviours are discussed both in analytical and graphical ways.展开更多
Nonlocal symmetry and explicit solution of the integrable Alice-Bob modified Korteweg-de Vries(ABm Kd V) equation is discussed, which has been established by the aid of the shifted parity and delayed time reversal to ...Nonlocal symmetry and explicit solution of the integrable Alice-Bob modified Korteweg-de Vries(ABm Kd V) equation is discussed, which has been established by the aid of the shifted parity and delayed time reversal to describe two-place events. Based on the Lax pair which contains the two-order partial derivative, the Lie symmetry group method is successfully applied to find the exact invariant solution for the AB-m Kd V equation with nonlocal symmetry by introducing one suitable auxiliary variable. Meanwhile, based on the prolonged system, the explicit analytic interaction solutions related to some specific functions are derived. Figures show the physical phenomenon, that is, "the shifted parity and delayed time reversal to describe two-place events".展开更多
基金Supported by the National Natural Science Foundation of China （20736002）, the National High Technology Research and Development Program of China （2008AA062302） and Program for Changjiang Scholars and Innovative Research Team in University of China （IRT0721）.
文摘Covalent organic framework （COF） is a porous material with low density and large BET （Brtmauer-Emmett-Teller） surface area. They have great potential in gas adsorption and separation. In this work, the adsorption of pure CO2 and CO2/CH4 mixture on modified COF-102 was simulated by using GCMC （grand canonical Monte Carlo）. Metal Li was incorporated into COF-102 through three doping methods, including charge exchange, O^--Li6＋ dipolar interaction and O^--Li^＋ chemical bonding. The influence of Li doping on the adsorption of CO2 was studied. The results showed that among the three methods, the dipole doping is the best way to improve CO2 adsorption performance. Further, the ligands of COF-102 were replaced by extended aromatic moieties, such as diphenyl and pyrene. The adsorption capacity of CO2 and CH4, and the selectivity of CO2/CH4 on the ligand-replaced COF-102 were studied. The capacity of CO2 and CH4 on the ligand-replaced COF-102 had obvious changes; hence the selectivity of CO2/CH4 can be adjusted accordingly.
文摘A scoping review was conducted to report on the nature and extent of the literature addressing the transition through peri and post retirement for people living with chronic disorder（s）. The secondary purpose was to determine the extent that gender issues and the transition age （50-65） are specifically addressed. Of 3,256 titles identified, 111 articles meet the inclusion criteria. Information was often indirect but addressed varying health domains that significantly influence transitional stages toward retirement and illustrating the burden of chronic comorbid health problems, unequal gender positions with differences in labour force participation, retirement pensions, and changing social dynamics. Few studies directly addressed the complex interaction of chronic health outcomes, psychological well-being, social and financial health as a significant paradigm in determining a successful transition into retirement. Needed are prospective longitudinal studies that measure predictors and outcomes of retirement transitioning along with qualitative studies that define the decision-making process. Given the substantial differential impact in respect to retirement risk factors and opportunities, there must be consideration in design and analysis for future high quality research.
文摘In this paper, we consider a modified Leslie-Clower predator prey model with Holling- type II schemes and mutual interference. By applying the comparison theorem of the differential equation and constructing a suitable Lyapunov function, sufficient conditions which guarantee the permanence and existence of a unique globally attractive positive almost periodic solution of the system are obtained. Our results not only supplement but also improve some existing ones.
基金Supported by the Natural Science Foundation of Zhejiang Province under Grant No.LZ15A050001the National Natural Science Foundation of China under Grant No.11675146Talent Fund and K.C.Wong Magna Fund in Ningbo University
文摘The Backlund transformation（BT） of the m Kd V-s G equation is constructed by introducing a new transformation. Infinitely many nonlocal symmetries are obtained in terms of its BT. The soliton-periodic wave interaction solutions are explicitly derived by the classical Lie-group reduction method. Particularly, some special concrete soliton and periodic wave interaction solutions and their behaviours are discussed both in analytical and graphical ways.
基金Supported by the National Natural Science Foundation of China under Grant Nos.11705077 and 11775104Natural Science Foundation of Zhejiang Province under Grant No.LY14A010005Scientific Research Foundation of the First-Class Discipline of Zhejiang Province(B)(No.201601)
文摘Nonlocal symmetry and explicit solution of the integrable Alice-Bob modified Korteweg-de Vries(ABm Kd V) equation is discussed, which has been established by the aid of the shifted parity and delayed time reversal to describe two-place events. Based on the Lax pair which contains the two-order partial derivative, the Lie symmetry group method is successfully applied to find the exact invariant solution for the AB-m Kd V equation with nonlocal symmetry by introducing one suitable auxiliary variable. Meanwhile, based on the prolonged system, the explicit analytic interaction solutions related to some specific functions are derived. Figures show the physical phenomenon, that is, "the shifted parity and delayed time reversal to describe two-place events".
