Electrochemical impedance spectroscopy(EIS)was used to examine the electrical properties of metakaolin(MK)cement-based materials at elevated temperatures.We utilized a new equivalent circuit to investigate the EIS res...Electrochemical impedance spectroscopy(EIS)was used to examine the electrical properties of metakaolin(MK)cement-based materials at elevated temperatures.We utilized a new equivalent circuit to investigate the EIS results of cementitious materials blended with MK at these temperatures.A new evaluation method to high temperature damage is proposed.The findings show that both elevated temperatures and MK contents in cement mortar can impact the impedance spectra’s form properties.However,the residual compressive strength of the MK-blended cementitious material at elevated temperatures does not improve with the addition of MK.A quantitative relationship between the electrochemical parameters of the new equivalent circuit and the residual compressive strength is determined.The degree of high-temperature damage to cementitious materials can be evaluated based on these electrochemical parameters,providing a new approach for evaluating the high-temperature damage of MK-blend cementitious materials.展开更多
Spatial heterogeneity is widely used in diverse applications, such as recognizing ecological process, guiding ecological restoration, managing land use, etc. Many researches have focused on the inherent scale multipli...Spatial heterogeneity is widely used in diverse applications, such as recognizing ecological process, guiding ecological restoration, managing land use, etc. Many researches have focused on the inherent scale multiplicity of spatial heterogeneity by using various environmental variables. How these variables affect their corresponding spatial heterogeneities, however, have received little attention. In this paper, we examined the effects of characteristics of normalized difference vegetation index （NDVI） and its related bands variable images, namely red and near infrared （NIR）, on their corresponding spatial heterogeneity detection based on variogram models. In a coastal wetland region, two groups of study sites with distinct fractal vegetation cover were tested and analyzed. The results show that： l） in high fractal vegetation cover （H-FVC） area, NDV! and NIR variables display a similar ability in detecting the spatial he- terogeneity caused by vegetation growing status structure; 2） in low fractal vegetation cover （L-FVC） area, the NIR and red variables outperform NDVI in the survey of soil spatial heterogeneity; and 3） generally, NIR variable is ubiquitously applicable for vegetation spatial heterogeneity investigation in different fractal vegetation covers. Moreover, as variable selection for remote sensing applications should fully take the characteristics of variables and the study object into account, the proposed variogram analysis method can make the variable selection objectively and scientifically, especially in studies related to spatial heterogeneity using remotely sensed data.展开更多
This paper discussed how to protect and control the quality of wild Chinese herbal medicine resources in nature reserves by taking Longyuwan National Forest Park within Funiu Mountain Nature Reserve as an example. Thr...This paper discussed how to protect and control the quality of wild Chinese herbal medicine resources in nature reserves by taking Longyuwan National Forest Park within Funiu Mountain Nature Reserve as an example. Through the combination of three methods including literature review, visiting and investigational studies, and field surveys, the data of investigation, collection and collation were analyzed. According to data of surveys, collection and collation, problems related to the protection of wild Chinese herbal medicine resources faced by Longyuwan Scenic Spot within Funiu Mountain Nature Reserve were also analyzed and protection strategies and quality control of wild Chinese herbal medicine resources in this nature reserve were discussed. It was expected that the results would provide important scientific references for the sustainable development, protection and quality control of wild Chinese herbal medicine resources within nature reserves.展开更多
OBJECTIVE Scalp mechanical stimulation,like combing,is one of the useful methods to keep brain health,which was historically recorded in traditional Chinese medicine thousand years ago.For the brain care,it is conside...OBJECTIVE Scalp mechanical stimulation,like combing,is one of the useful methods to keep brain health,which was historically recorded in traditional Chinese medicine thousand years ago.For the brain care,it is considered to promote cerebrovascular circulation to prevent alopecia,headache,neurasthenia,insomnia,memory deficits.However,few study was reported on its effect and how the scalp mechanical stimulation works on vascular functions.Therefore,in this study,we try to illustrate the effect of combing on the cerebrovascular.METHODS In vivo,the anesthetized mice have been used to observe the effects of scalp mechanical stimulation.Infrared thermal imaging has been used to measure the skin temperature;vasodilation has been evaluated by retro-orbital injection of FITC-dextran 150 ku;the permeability of Blood-Brain Barrier(BBB)was analyzed by confocal microscopy of FITC-dextran 40 ku extravasation and a spectrofluorometric assay of Even Blue extravasation.RESLUTS We found that scalp mechanical stimulation rather than on the back can maintain the body temperature,especially raise the temperature in the ears.Accordingly,a moderate vasodilatation of auricles′capillaries(≤8μm)was observed,the phenomenon of which did not occur combing on the back.Furthermore,the permeability of BBB was promoted by the assays of small molecular extravasation.In addition,in vivo imaging,the small molecular of FITC-dextran(40 ku)was found to transport far away from the blood vessels into the brain parenchyma with the lapse of time.CONCLUSION Scalp mechanical stimulation can work on vasodilatation of auricles and promotion of BBB under a biological condition.Combing,as a daily behavior,simple but may yield novel insights into neuroprotection.展开更多
基金Funded by the Natural Science Foundation of Inner Mongolia Autonomous Region(No.2024QN05023)High Level Talent Research Launch Foundation of Inner Mongolia University(No.10000-22311201/008)。
文摘Electrochemical impedance spectroscopy(EIS)was used to examine the electrical properties of metakaolin(MK)cement-based materials at elevated temperatures.We utilized a new equivalent circuit to investigate the EIS results of cementitious materials blended with MK at these temperatures.A new evaluation method to high temperature damage is proposed.The findings show that both elevated temperatures and MK contents in cement mortar can impact the impedance spectra’s form properties.However,the residual compressive strength of the MK-blended cementitious material at elevated temperatures does not improve with the addition of MK.A quantitative relationship between the electrochemical parameters of the new equivalent circuit and the residual compressive strength is determined.The degree of high-temperature damage to cementitious materials can be evaluated based on these electrochemical parameters,providing a new approach for evaluating the high-temperature damage of MK-blend cementitious materials.
基金Under the auspices of National Key Technology Research and Development Program of China (No.2009BADB3B01-05)Knowledge Innovation Programs of Chinese Academy of Sciences (No. KSCX1-YW-09-13)
文摘Spatial heterogeneity is widely used in diverse applications, such as recognizing ecological process, guiding ecological restoration, managing land use, etc. Many researches have focused on the inherent scale multiplicity of spatial heterogeneity by using various environmental variables. How these variables affect their corresponding spatial heterogeneities, however, have received little attention. In this paper, we examined the effects of characteristics of normalized difference vegetation index （NDVI） and its related bands variable images, namely red and near infrared （NIR）, on their corresponding spatial heterogeneity detection based on variogram models. In a coastal wetland region, two groups of study sites with distinct fractal vegetation cover were tested and analyzed. The results show that： l） in high fractal vegetation cover （H-FVC） area, NDV! and NIR variables display a similar ability in detecting the spatial he- terogeneity caused by vegetation growing status structure; 2） in low fractal vegetation cover （L-FVC） area, the NIR and red variables outperform NDVI in the survey of soil spatial heterogeneity; and 3） generally, NIR variable is ubiquitously applicable for vegetation spatial heterogeneity investigation in different fractal vegetation covers. Moreover, as variable selection for remote sensing applications should fully take the characteristics of variables and the study object into account, the proposed variogram analysis method can make the variable selection objectively and scientifically, especially in studies related to spatial heterogeneity using remotely sensed data.
基金Supported by Funding from the State Nationalities Affairs Commission(2015-GM-178)National Training Programs of Innovation and Entrepreneurship for Undergraduates(GCYS2016110001)
文摘This paper discussed how to protect and control the quality of wild Chinese herbal medicine resources in nature reserves by taking Longyuwan National Forest Park within Funiu Mountain Nature Reserve as an example. Through the combination of three methods including literature review, visiting and investigational studies, and field surveys, the data of investigation, collection and collation were analyzed. According to data of surveys, collection and collation, problems related to the protection of wild Chinese herbal medicine resources faced by Longyuwan Scenic Spot within Funiu Mountain Nature Reserve were also analyzed and protection strategies and quality control of wild Chinese herbal medicine resources in this nature reserve were discussed. It was expected that the results would provide important scientific references for the sustainable development, protection and quality control of wild Chinese herbal medicine resources within nature reserves.
文摘OBJECTIVE Scalp mechanical stimulation,like combing,is one of the useful methods to keep brain health,which was historically recorded in traditional Chinese medicine thousand years ago.For the brain care,it is considered to promote cerebrovascular circulation to prevent alopecia,headache,neurasthenia,insomnia,memory deficits.However,few study was reported on its effect and how the scalp mechanical stimulation works on vascular functions.Therefore,in this study,we try to illustrate the effect of combing on the cerebrovascular.METHODS In vivo,the anesthetized mice have been used to observe the effects of scalp mechanical stimulation.Infrared thermal imaging has been used to measure the skin temperature;vasodilation has been evaluated by retro-orbital injection of FITC-dextran 150 ku;the permeability of Blood-Brain Barrier(BBB)was analyzed by confocal microscopy of FITC-dextran 40 ku extravasation and a spectrofluorometric assay of Even Blue extravasation.RESLUTS We found that scalp mechanical stimulation rather than on the back can maintain the body temperature,especially raise the temperature in the ears.Accordingly,a moderate vasodilatation of auricles′capillaries(≤8μm)was observed,the phenomenon of which did not occur combing on the back.Furthermore,the permeability of BBB was promoted by the assays of small molecular extravasation.In addition,in vivo imaging,the small molecular of FITC-dextran(40 ku)was found to transport far away from the blood vessels into the brain parenchyma with the lapse of time.CONCLUSION Scalp mechanical stimulation can work on vasodilatation of auricles and promotion of BBB under a biological condition.Combing,as a daily behavior,simple but may yield novel insights into neuroprotection.
