Deep oil exploration coring technology cannot accurately maintain the in-situ pressure and temperature of samples, which leads to a distortion of deep oil and gas resource reserve evaluations based on conventional cor...Deep oil exploration coring technology cannot accurately maintain the in-situ pressure and temperature of samples, which leads to a distortion of deep oil and gas resource reserve evaluations based on conventional cores and cannot guide the development of deep oil and gas resources on Earth. The fundamental reason is the lack of temperature and pressure control in in-situ coring environments. In this paper, a pressure control method of a coring device is studied. The theory and method of deep intelligent temperature-pressure coupling control are innovatively proposed, and a multifield coupling dynamic sealing model is established. The optimal cardinality three term PID (Proportional-Integral-Differential) intelligent control algorithm of pressure system is developed. The temperature-pressure characteristic of the gas-liquid two-phase cavity is analyzed, and the pressure intelligent control is carried out based on three term PID control algorithms. An in-situ condition-preserved coring (ICP-Coring) device is developed, and an intelligent control system for the temperature and pressure of the coring device is designed and verified by experiments. The results show that the temperature-pressure coupling control system can effectively realize stable sealing under temperature-pressure fields of 140 MPa and 150 °C. The temperature-pressure coupling control method can accurately realize a constant pressure inside the coring device. The maximum working pressure is 140 MPa, and the effective pressure compensation range is 20 MPa. The numerical simulation experiment of pressure system control algorithm is carried out, and the optimal cardinality and three term coefficients are obtained. The pressure steady-state error is less than 0.01%. The method of temperature-pressure coupling control has guiding significance for coring device research, and is also the basis for temperature-pressure decoupling control in ICP-Coring.展开更多
Most of the current graphene plasmonic researches are based on the substrates with isotropic dielectric constant such as silicon.In this work,we investigate optical properties of graphene nanoribbon arrays placed on a...Most of the current graphene plasmonic researches are based on the substrates with isotropic dielectric constant such as silicon.In this work,we investigate optical properties of graphene nanoribbon arrays placed on a uniaxially anisotropic substrate,where the anisotropy provides an additional freedom to tune the behaviors of graphene plasmons,and its effect can be described by a simple effective formula.In practice,the substrates of semi-infinite and finite thickness are discussed by using both the formula and full wave simulations.Particularly,the dielectric constants ε|| and ε⊥ approaching zero are intensively studied,which show different impacts on the transverse magnetic(TM) surface modes.In reality,the hexagonal boron nitride(hBN) can be chosen as the anisotropic substrate,which is also a hyperbolic material in nature.展开更多
Historically,Chinese religions have been the product of continuous exchange with and mutual learning from other religions and civilizations.Religions from other areas of the world,especially Buddhism from India,Christ...Historically,Chinese religions have been the product of continuous exchange with and mutual learning from other religions and civilizations.Religions from other areas of the world,especially Buddhism from India,Christianity from the Mediterranean,and Islam from Arabia have been localized and inculturated by absorbing elements of Chinese culture,achieving new Chinese forms through creative transformation and innovative development while enriching the diversity and enhancing the flourishing of Chinese culture.To continue to support the inculturation of religions in China and to foster dialogue between them and Chinese culture is to build China as a cultural community with diverse religions.It is necessary therefore to consult the representative theories and practices of inter-religious dialogue in contemporary international academic circles—e.g.,scriptural reasoning,comparative theology,and interreligious theology then to develop inculturated forms of world religions through a comprehensive inculturation strategy of recovering,retrieving,restoring,reconfiguring,reconstructing,and renewing.By such means,we can contribute to building up China as a cultural community of religious diversity.展开更多
基金supported by the National Natural Science Foundation of China(grant numbers 51827901,51805340)funded by the Program for Guangdong Introducing Innovative and Enterpreneurial Teams(No.2019ZT08G315)Shenzhen Basic Research Program(General Program)(No.JCYJ20190808153416970).
文摘Deep oil exploration coring technology cannot accurately maintain the in-situ pressure and temperature of samples, which leads to a distortion of deep oil and gas resource reserve evaluations based on conventional cores and cannot guide the development of deep oil and gas resources on Earth. The fundamental reason is the lack of temperature and pressure control in in-situ coring environments. In this paper, a pressure control method of a coring device is studied. The theory and method of deep intelligent temperature-pressure coupling control are innovatively proposed, and a multifield coupling dynamic sealing model is established. The optimal cardinality three term PID (Proportional-Integral-Differential) intelligent control algorithm of pressure system is developed. The temperature-pressure characteristic of the gas-liquid two-phase cavity is analyzed, and the pressure intelligent control is carried out based on three term PID control algorithms. An in-situ condition-preserved coring (ICP-Coring) device is developed, and an intelligent control system for the temperature and pressure of the coring device is designed and verified by experiments. The results show that the temperature-pressure coupling control system can effectively realize stable sealing under temperature-pressure fields of 140 MPa and 150 °C. The temperature-pressure coupling control method can accurately realize a constant pressure inside the coring device. The maximum working pressure is 140 MPa, and the effective pressure compensation range is 20 MPa. The numerical simulation experiment of pressure system control algorithm is carried out, and the optimal cardinality and three term coefficients are obtained. The pressure steady-state error is less than 0.01%. The method of temperature-pressure coupling control has guiding significance for coring device research, and is also the basis for temperature-pressure decoupling control in ICP-Coring.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.11604382 and 11574140)the Natural Science Foundation of Jiangsu Province,China(Grant No.BK20160236).
文摘Most of the current graphene plasmonic researches are based on the substrates with isotropic dielectric constant such as silicon.In this work,we investigate optical properties of graphene nanoribbon arrays placed on a uniaxially anisotropic substrate,where the anisotropy provides an additional freedom to tune the behaviors of graphene plasmons,and its effect can be described by a simple effective formula.In practice,the substrates of semi-infinite and finite thickness are discussed by using both the formula and full wave simulations.Particularly,the dielectric constants ε|| and ε⊥ approaching zero are intensively studied,which show different impacts on the transverse magnetic(TM) surface modes.In reality,the hexagonal boron nitride(hBN) can be chosen as the anisotropic substrate,which is also a hyperbolic material in nature.
文摘Historically,Chinese religions have been the product of continuous exchange with and mutual learning from other religions and civilizations.Religions from other areas of the world,especially Buddhism from India,Christianity from the Mediterranean,and Islam from Arabia have been localized and inculturated by absorbing elements of Chinese culture,achieving new Chinese forms through creative transformation and innovative development while enriching the diversity and enhancing the flourishing of Chinese culture.To continue to support the inculturation of religions in China and to foster dialogue between them and Chinese culture is to build China as a cultural community with diverse religions.It is necessary therefore to consult the representative theories and practices of inter-religious dialogue in contemporary international academic circles—e.g.,scriptural reasoning,comparative theology,and interreligious theology then to develop inculturated forms of world religions through a comprehensive inculturation strategy of recovering,retrieving,restoring,reconfiguring,reconstructing,and renewing.By such means,we can contribute to building up China as a cultural community of religious diversity.