The intensity of heat output of coal, the rate of oxygen consumption and the influence function of coal size are tested by the big coal spontaneous combustion experiment unit. The independence of the coefficient of he...The intensity of heat output of coal, the rate of oxygen consumption and the influence function of coal size are tested by the big coal spontaneous combustion experiment unit. The independence of the coefficient of heat convection is studied. And based on the conservation principle of energy and the real conditions, such as coal temperature,air temperature, the geometry size of roadway, air flux, the oxygen concentration in the loose coal around the roadway, the threshold parameters resulting coal spontaneous combustion are put forward, and the index determining the danger zone liable to self ignite are evaluated. Finally, the method determining the danger zone liable to spontaneous ignition around coal roadway at fully mechanized long wall top coal caving face is put forward. Based on the determination method and real conditions in the roadway, the coal around roadway can be divided four zones.展开更多
Improvements to the Kessler-type parameterization of warm cloud microphysical conversion processes（also called autoconversion） are proposed based on a large number of Cloud Sat observations between June2006 and Apri...Improvements to the Kessler-type parameterization of warm cloud microphysical conversion processes（also called autoconversion） are proposed based on a large number of Cloud Sat observations between June2006 and April 2011 over Asian land areas. The emphasis is given to the vertical distribution of liquid water content（LWC）, particularly, the threshold values of LWC for autoconversion. The results warrant a new approach to the numerical parameterization of autoconversion in warm clouds. One feature of this new approach is that the autoconversion threshold, which has been treated as a constant in previous parameterization schemes, is diagnosed as a function of altitude by using a relationship between LWC and height（H）derived from Cloud Sat observations： LWCdig =-500.0 ln（ H/9492.2）. Under this framework, the threshold LWC decreases with increasing H, allowing autoconversion to occur in clouds with low LWC（approximately0.3 g m^-3） at levels above 5.5 km. Autoconversion rates calculated based on the new parameterization are compared to those calculated based on several commonly used parameterization schemes over a range of LWCs from 0.01 to 1.0 g m^-3. The new scheme provides reasonable simulations of autoconversion at various vertical levels.展开更多
In this paper,we formulate the transmission phenomena of Hand-Foot-Mouth Disease(HFMD)through non-integer derivative.We interrogate the biological meaningful results of the recommended system of HFMD.The basic reprodu...In this paper,we formulate the transmission phenomena of Hand-Foot-Mouth Disease(HFMD)through non-integer derivative.We interrogate the biological meaningful results of the recommended system of HFMD.The basic reproduction number is determined through next generation method and the impact of different parameters on the reproduction number is examined with the help of partial rank correlation coeficient(PRCC)technique.In addition,we concentrated on qualitative analysis and dynamical behavior of HFMD dynamics.Banach's and Schaefer's fixed-point theorems are used to analyze the uniqueness and existence of the solution of the proposed HFMD model.The HFMD system's Ulam-Hyers stability has been confirmed to be sufficient.To highlight the impact of the parameters on the dynamics of HFMD,we performed several simulations through numerical scheme to conceptualize the transmission route of the infection.To be more specific,numerical simulations are used to visualize the effect of input parameters on the systems dynamics.We have shown the key input parameters of the system for the control of infection in the society.展开更多
This paper proposes a(t,n)-threshold verifiable secret sharing scheme with changeable parameters based on a trapdoor one-way function.This scheme consists of a generation phase,a distribution phase,an encoding phase a...This paper proposes a(t,n)-threshold verifiable secret sharing scheme with changeable parameters based on a trapdoor one-way function.This scheme consists of a generation phase,a distribution phase,an encoding phase and a reconstruction phase.The generation and distribution phases are,respectively,based on Shamir’s and Feldman’s approaches,while the encoding phase is based on a novel trapdoor one-way function.In the reconstruction phase,the shares and reconstructed secret are validated using a cryptographic hash function.In comparison with existing schemes,the proposed scheme leaks no direct information about the secret from public information.Furthermore,unlike some existing schemes,the generation and distribution phases of the proposed scheme are both independent of the secret.This feature leads to a number of advantages over existing approaches such as the dealer’s ability to perform the following modifications without updating the shares(i)modify the secret and(ii)adjust the threshold parameters of the scheme.Furthermore,each participant receives a single share,and designated participants can be given the privilege of choosing their own shares for reconstructing a secret S.Moreover,the proposed scheme possesses a high level of security which is inherited from the schemes of Shamir and Feldman,in addition to the trapdoor one-way function and the employed cryptographic hash function.展开更多
文摘The intensity of heat output of coal, the rate of oxygen consumption and the influence function of coal size are tested by the big coal spontaneous combustion experiment unit. The independence of the coefficient of heat convection is studied. And based on the conservation principle of energy and the real conditions, such as coal temperature,air temperature, the geometry size of roadway, air flux, the oxygen concentration in the loose coal around the roadway, the threshold parameters resulting coal spontaneous combustion are put forward, and the index determining the danger zone liable to self ignite are evaluated. Finally, the method determining the danger zone liable to spontaneous ignition around coal roadway at fully mechanized long wall top coal caving face is put forward. Based on the determination method and real conditions in the roadway, the coal around roadway can be divided four zones.
基金Supported by the National Natural Science Foundation of China(41405006)China Meteorological Administration Special Public Welfare Research Fund(GYHY201006014 and GYHY201306005)+1 种基金National(Key)Basic Research and Development(973)Program of China(2012CB417204)Basic Research Fund of the Chinese Academy of Meteorological Sciences(2014R016 and2014Z001)
文摘Improvements to the Kessler-type parameterization of warm cloud microphysical conversion processes（also called autoconversion） are proposed based on a large number of Cloud Sat observations between June2006 and April 2011 over Asian land areas. The emphasis is given to the vertical distribution of liquid water content（LWC）, particularly, the threshold values of LWC for autoconversion. The results warrant a new approach to the numerical parameterization of autoconversion in warm clouds. One feature of this new approach is that the autoconversion threshold, which has been treated as a constant in previous parameterization schemes, is diagnosed as a function of altitude by using a relationship between LWC and height（H）derived from Cloud Sat observations： LWCdig =-500.0 ln（ H/9492.2）. Under this framework, the threshold LWC decreases with increasing H, allowing autoconversion to occur in clouds with low LWC（approximately0.3 g m^-3） at levels above 5.5 km. Autoconversion rates calculated based on the new parameterization are compared to those calculated based on several commonly used parameterization schemes over a range of LWCs from 0.01 to 1.0 g m^-3. The new scheme provides reasonable simulations of autoconversion at various vertical levels.
文摘In this paper,we formulate the transmission phenomena of Hand-Foot-Mouth Disease(HFMD)through non-integer derivative.We interrogate the biological meaningful results of the recommended system of HFMD.The basic reproduction number is determined through next generation method and the impact of different parameters on the reproduction number is examined with the help of partial rank correlation coeficient(PRCC)technique.In addition,we concentrated on qualitative analysis and dynamical behavior of HFMD dynamics.Banach's and Schaefer's fixed-point theorems are used to analyze the uniqueness and existence of the solution of the proposed HFMD model.The HFMD system's Ulam-Hyers stability has been confirmed to be sufficient.To highlight the impact of the parameters on the dynamics of HFMD,we performed several simulations through numerical scheme to conceptualize the transmission route of the infection.To be more specific,numerical simulations are used to visualize the effect of input parameters on the systems dynamics.We have shown the key input parameters of the system for the control of infection in the society.
文摘This paper proposes a(t,n)-threshold verifiable secret sharing scheme with changeable parameters based on a trapdoor one-way function.This scheme consists of a generation phase,a distribution phase,an encoding phase and a reconstruction phase.The generation and distribution phases are,respectively,based on Shamir’s and Feldman’s approaches,while the encoding phase is based on a novel trapdoor one-way function.In the reconstruction phase,the shares and reconstructed secret are validated using a cryptographic hash function.In comparison with existing schemes,the proposed scheme leaks no direct information about the secret from public information.Furthermore,unlike some existing schemes,the generation and distribution phases of the proposed scheme are both independent of the secret.This feature leads to a number of advantages over existing approaches such as the dealer’s ability to perform the following modifications without updating the shares(i)modify the secret and(ii)adjust the threshold parameters of the scheme.Furthermore,each participant receives a single share,and designated participants can be given the privilege of choosing their own shares for reconstructing a secret S.Moreover,the proposed scheme possesses a high level of security which is inherited from the schemes of Shamir and Feldman,in addition to the trapdoor one-way function and the employed cryptographic hash function.
