目的:分析计时起立-行走测试(TUGT)对老年2型糖尿病周围神经病变病人跌倒风险的评估价值。方法:回顾性分析2020年1月—2022年12月在我院内分泌科纳入治疗的2型糖尿病周围神经病变病人120例为研究对象,收集病人一般资料、TUGT测试结果,采...目的:分析计时起立-行走测试(TUGT)对老年2型糖尿病周围神经病变病人跌倒风险的评估价值。方法:回顾性分析2020年1月—2022年12月在我院内分泌科纳入治疗的2型糖尿病周围神经病变病人120例为研究对象,收集病人一般资料、TUGT测试结果,采用SPSS 22.0、R Studio 1.4.1103进行联合数据分析,研究相关性和预测价值。结果:本研究纳入的120例病人均顺利完成TUGT测试,完成率为100%,数据收集率为100%。所有病人TUGT时间为(16.03±3.29)s。Spearman相关性分析结果显示,TUGT时间与跌倒史、性别之间呈正相关(P<0.05);TUGT时间与2型糖尿病病程、合并周围神经病变病程、年龄之间无明显相关关系。TUGT时间用于预测老年2型糖尿病周围神经病变病人跌倒风险的最佳临界值为14.19 s,受试者工作特征曲线(ROC)曲线下面积(AUC)值为0.773,敏感度为86.29%,特异度为67.16%。结论:跌倒史、性别是影响老年2型糖尿病周围神经病变病人TUGT时间的危险因素,同时,TUGT时间对老年2型糖尿病周围神经病变病人跌倒具有良好的预测价值。展开更多
The concept of the carbon cycle in the old goaf of a coal mine based on CO_(2)utilization and storage was put forward adhering to the principle of low-carbon development,utilization of space resources in old goafs,and...The concept of the carbon cycle in the old goaf of a coal mine based on CO_(2)utilization and storage was put forward adhering to the principle of low-carbon development,utilization of space resources in old goafs,and associated gas resources development.Firstly,the evolution characteristics of overburden fissures in the goaf of the case was studied using a two-dimensional physical similarity simulation test,the sealing performance of the caprocks after stabilization was analyzed,and the fissures were counted and classi-fied.Then,the process of gaseous CO_(2)injection in the connected fissure was simulated by Ansys Fluent software,and the migration law and distribution characteristics of CO_(2)under the condition of gaseous CO_(2)injection were analyzed.Finally,the estimation models of free CO_(2)storage capacity in the old goaf were constructed considering the proportion of connected fissure and the effectiveness of CO_(2)injection.The CO_(2)storage capacity in the old goaf of the case coal mine was estimated.The results showed that a caprock group of“hard-thickness low-permeability hard-thickness”was formed after the caprock-fissures system in the goaf of the case tended to be stable vertically.The connected fissure,occlude cracks,and micro-fractures in the goaf accounted for 85.5%,8.5%,and 6%of the total fissures,respectively.Gaseous CO_(2)first migrated to the bottom of the connected fissure after CO_(2)was injected into the goaf,then spread horizontally along the bottom of the connected fissure after reaching the bottom,and finally spread longitudinally after filling the bottom of the entire connected fissure.The theoretical and effective storage capacities of free CO_(2)at normal temperature and pressure in the old goaf of the case were 9757 and 7477 t,respectively.The effective storage capacity of free CO_(2)at normal temperature and pressure in the old goaf after all minefield mined was 193404 t.The research can provide some reference for the coal mining industry to help the goal of“carbon peaking and carbon neutrality”.展开更多
High-accuracy continuous measurements of atmospheric concentrations of CO2 were made from May 2016 to December 2017 using the Picarro G2301 analyzer at Xinglong station(40°24′N,117°30′E,940 MSL),150 km nor...High-accuracy continuous measurements of atmospheric concentrations of CO2 were made from May 2016 to December 2017 using the Picarro G2301 analyzer at Xinglong station(40°24′N,117°30′E,940 MSL),150 km northeast of Beijing.The near-ground CO2 measurements were calibrated by standards based on WMO procedures.The regional background measurements were ltered by the robust extraction of baseline signal method to study the seasonal and diurnal cycles.The regional background CO2 concentrations were low in summer.The maximum diffierence between the local sources and regional background CO2 concentrations occurred in summer and autumn,indicating a strong in uence from local sources.Cluster analysis and potential source contribution function analysis showed that the long-distance transport of anthropogenic emissions in the Beijing Tianjin Hebei metropolitan area in uenced the CO2 concentrations in Xinglong,espe-cially in summer.The diurnal variation of CO2 was mainly in uenced by the various vertical transport conditions of the tropospheric atmosphere in a day.展开更多
Dear editor,The advent of modern molecular mechanism’s approach to disease treatment is highly advancing to mitigate/normalize the symptoms of disease i.e.hyperglycemia by targeting at least eight different pathophys...Dear editor,The advent of modern molecular mechanism’s approach to disease treatment is highly advancing to mitigate/normalize the symptoms of disease i.e.hyperglycemia by targeting at least eight different pathophysiological approaches popularly known as omnious octet[1].Importantly,type 2 diabetes is a展开更多
The Device-to-Device(D2D)communication underlaying cellular networks is considered in this study.The D2D transmitter in the D2D mode can directly transmit messages to a receiver,but it may interfere with the transmiss...The Device-to-Device(D2D)communication underlaying cellular networks is considered in this study.The D2D transmitter in the D2D mode can directly transmit messages to a receiver,but it may interfere with the transmission of another cellular user who shares the same uplink channel.The transmitter can also operate in a cellular mode in which no interference to another cellular user occurs.We propose a mode selection scheme that aims to minimize the transmission power of the D2D transmitter subject to constraints on the minimum required data rate and maximum interference to other cellular users.The proposed scheme is based on bounds for transmission power and is less complex than the optimal scheme.Furthermore,it requires only a few statistics and does not need a fading channel distribution.The performance of the scheme is close to optimum when the number of Base Station(BS)antennas is large,and the mean absolute deviation of the fading terms is small.We verify this with numerical results of the Rician and Rayleigh fading channels by assuming that the BS antennas are independent.The simulation results for the two correlated BS antennas are presented herein.展开更多
In this paper Pi2 pulsations at Zhongshan Station of Antarctica are analyzed from October 1 - 31, 1996. Their characteristics e. g. occurrence frequency,frequency, and polarization are studied. The characteristics of ...In this paper Pi2 pulsations at Zhongshan Station of Antarctica are analyzed from October 1 - 31, 1996. Their characteristics e. g. occurrence frequency,frequency, and polarization are studied. The characteristics of Pi2 pulsations are summerized as follows: (1 ) Pi2 pulsations at Zhongshan Station usually take place from 2000 MLT to 0200 MLT; the main frequencies are between 6. 79 mHz and 13. 58mHZ; (2 ) Pi2 pulsations with low frequencies are dominent. The range of main frequencies becomes narrow at midnight; (3) The Polarization of Pi2 pulsations are almost linear; (4) About the orientation of major axes the NW-SE direction is dominent before 2200 MLT and NE-SW is dominent after 2200 MLT. The generation mechanism of Pi2 pulsations at Zhongshan Station is discussed theoretically.展开更多
4 elderly care service stations in Zhanlan Road Street,Xicheng District,Beijing are selected,and questionnaires are designed and distributed to the surrounding elderly population to understand their needs and satisfac...4 elderly care service stations in Zhanlan Road Street,Xicheng District,Beijing are selected,and questionnaires are designed and distributed to the surrounding elderly population to understand their needs and satisfaction with the station environment.By observing elderly care service stations on site,the characteristics,obstacles,and shortcomings of the environment are recorded,and relevant data are collected and analyzed,such as the characteristics of the elderly population being interviewed,the planning and design data of the station environment,and the distribution of service facilities.The overall characteristics of the spatial environment of elderly care stations are summarized,and renovation measures and optimization suggestions are provided for the current shortcomings,thereby providing some basis for the spatial design of community elderly care service stations in the future.展开更多
The rapid development of the“Internet+”has ushered in a new era of global digital technology innovation.Concurrent with the deepening trends of economic globalization and integration,international trade is progressi...The rapid development of the“Internet+”has ushered in a new era of global digital technology innovation.Concurrent with the deepening trends of economic globalization and integration,international trade is progressively undergoing extensive digitization,with cross-border e-commerce emerging as a significant manifestation of this transformation.Within this landscape,the cross-border e-commerce B2B platform is anticipated to become a pivotal driver for China’s cross-border trade growth,representing a strategic opportunity for trade transformation.This paper provides a comprehensive examination of the concepts,characteristics,and development status of cross-border e-commerce and B2B platforms,considering both global and Chinese perspectives.Focusing on a prominent case study,Alibaba International Station,a B2B cross-border e-commerce platform,the paper delves into its business model and core competencies,offering a thorough analysis of its role in the intricacies of international e-commerce and its contribution to the field.Drawing on insights gained,the paper concludes by presenting targeted recommendations from both the platform and government perspectives.These suggestions are informed by a nuanced understanding of the development opportunities and challenges facing China’s cross-border e-commerce B2B platforms.展开更多
目的观察胰岛素泵对老年2型糖尿病患者临床疗效的影响。方法65例老年2型糖尿病患者作为观察样本,利用随机数字表法进行分组,其中接受胰岛素皮下注射治疗的患者组成常规组(32例),接受胰岛素泵注射治疗患者组成研究组(33例)。比较两组患...目的观察胰岛素泵对老年2型糖尿病患者临床疗效的影响。方法65例老年2型糖尿病患者作为观察样本,利用随机数字表法进行分组,其中接受胰岛素皮下注射治疗的患者组成常规组(32例),接受胰岛素泵注射治疗患者组成研究组(33例)。比较两组患者临床治疗效果及血糖指标[糖化血红蛋白(HbA1c)、空腹血糖(FPG)以及餐后2 h血糖(2 h PG)]、血脂指标[低密度脂蛋白胆固醇(LDL-C)、总胆固醇(TC)、高密度脂蛋白胆固醇(HDL-C)以及甘油三酯(TG)]水平。结果研究组患者治疗总有效率96.97%高于常规组的81.25%(P<0.05)。治疗后,研究组患者FPG(5.15±1.11)mmol/L、2 h PG(9.65±1.22)mmol/L、HbA1c(6.07±1.15)%低于常规组的(6.52±1.12)mmol/L、(11.43±1.26)mmol/L、(7.43±1.14)%(P<0.05)。治疗后,研究组患者TG(1.06±0.12)mmol/L、TC(2.04±0.22)mmol/L、LDL-C(1.02±0.15)mmol/L低于常规组的(1.86±0.14)、(3.75±0.13)、(2.58±0.11)mmol/L,HDL-C(1.64±0.25)mmol/L高于常规组的(1.24±0.24)mmol/L(P<0.05)。结论对于老年2型糖尿病患者来说,应采用胰岛素泵注射治疗干预,这种治疗方式可以改善患者的血脂水平以及血糖水平,提升患者的临床治疗效果,应用效果显著。展开更多
文摘目的:分析计时起立-行走测试(TUGT)对老年2型糖尿病周围神经病变病人跌倒风险的评估价值。方法:回顾性分析2020年1月—2022年12月在我院内分泌科纳入治疗的2型糖尿病周围神经病变病人120例为研究对象,收集病人一般资料、TUGT测试结果,采用SPSS 22.0、R Studio 1.4.1103进行联合数据分析,研究相关性和预测价值。结果:本研究纳入的120例病人均顺利完成TUGT测试,完成率为100%,数据收集率为100%。所有病人TUGT时间为(16.03±3.29)s。Spearman相关性分析结果显示,TUGT时间与跌倒史、性别之间呈正相关(P<0.05);TUGT时间与2型糖尿病病程、合并周围神经病变病程、年龄之间无明显相关关系。TUGT时间用于预测老年2型糖尿病周围神经病变病人跌倒风险的最佳临界值为14.19 s,受试者工作特征曲线(ROC)曲线下面积(AUC)值为0.773,敏感度为86.29%,特异度为67.16%。结论:跌倒史、性别是影响老年2型糖尿病周围神经病变病人TUGT时间的危险因素,同时,TUGT时间对老年2型糖尿病周围神经病变病人跌倒具有良好的预测价值。
基金the financial support from the National Natural Science Foundation of China(No.52074217)the Natural Science Basic Research Program of Shaanxi Province(No.2021JLM-26).
文摘The concept of the carbon cycle in the old goaf of a coal mine based on CO_(2)utilization and storage was put forward adhering to the principle of low-carbon development,utilization of space resources in old goafs,and associated gas resources development.Firstly,the evolution characteristics of overburden fissures in the goaf of the case was studied using a two-dimensional physical similarity simulation test,the sealing performance of the caprocks after stabilization was analyzed,and the fissures were counted and classi-fied.Then,the process of gaseous CO_(2)injection in the connected fissure was simulated by Ansys Fluent software,and the migration law and distribution characteristics of CO_(2)under the condition of gaseous CO_(2)injection were analyzed.Finally,the estimation models of free CO_(2)storage capacity in the old goaf were constructed considering the proportion of connected fissure and the effectiveness of CO_(2)injection.The CO_(2)storage capacity in the old goaf of the case coal mine was estimated.The results showed that a caprock group of“hard-thickness low-permeability hard-thickness”was formed after the caprock-fissures system in the goaf of the case tended to be stable vertically.The connected fissure,occlude cracks,and micro-fractures in the goaf accounted for 85.5%,8.5%,and 6%of the total fissures,respectively.Gaseous CO_(2)first migrated to the bottom of the connected fissure after CO_(2)was injected into the goaf,then spread horizontally along the bottom of the connected fissure after reaching the bottom,and finally spread longitudinally after filling the bottom of the entire connected fissure.The theoretical and effective storage capacities of free CO_(2)at normal temperature and pressure in the old goaf of the case were 9757 and 7477 t,respectively.The effective storage capacity of free CO_(2)at normal temperature and pressure in the old goaf after all minefield mined was 193404 t.The research can provide some reference for the coal mining industry to help the goal of“carbon peaking and carbon neutrality”.
基金funded by the National Key Research and Development Program of China [grant numbers2017YFB0504000 and 2017YFC1501701]the National Natural Science Foundation of China [grant number 41575034]
文摘High-accuracy continuous measurements of atmospheric concentrations of CO2 were made from May 2016 to December 2017 using the Picarro G2301 analyzer at Xinglong station(40°24′N,117°30′E,940 MSL),150 km northeast of Beijing.The near-ground CO2 measurements were calibrated by standards based on WMO procedures.The regional background measurements were ltered by the robust extraction of baseline signal method to study the seasonal and diurnal cycles.The regional background CO2 concentrations were low in summer.The maximum diffierence between the local sources and regional background CO2 concentrations occurred in summer and autumn,indicating a strong in uence from local sources.Cluster analysis and potential source contribution function analysis showed that the long-distance transport of anthropogenic emissions in the Beijing Tianjin Hebei metropolitan area in uenced the CO2 concentrations in Xinglong,espe-cially in summer.The diurnal variation of CO2 was mainly in uenced by the various vertical transport conditions of the tropospheric atmosphere in a day.
文摘Dear editor,The advent of modern molecular mechanism’s approach to disease treatment is highly advancing to mitigate/normalize the symptoms of disease i.e.hyperglycemia by targeting at least eight different pathophysiological approaches popularly known as omnious octet[1].Importantly,type 2 diabetes is a
基金This work was supported by Kasetsart University Research and Development Institute(KURDI)under the FY2016 Kasetsart University research grant,and the Royal Golden Jubilee Ph.D.program.
文摘The Device-to-Device(D2D)communication underlaying cellular networks is considered in this study.The D2D transmitter in the D2D mode can directly transmit messages to a receiver,but it may interfere with the transmission of another cellular user who shares the same uplink channel.The transmitter can also operate in a cellular mode in which no interference to another cellular user occurs.We propose a mode selection scheme that aims to minimize the transmission power of the D2D transmitter subject to constraints on the minimum required data rate and maximum interference to other cellular users.The proposed scheme is based on bounds for transmission power and is less complex than the optimal scheme.Furthermore,it requires only a few statistics and does not need a fading channel distribution.The performance of the scheme is close to optimum when the number of Base Station(BS)antennas is large,and the mean absolute deviation of the fading terms is small.We verify this with numerical results of the Rician and Rayleigh fading channels by assuming that the BS antennas are independent.The simulation results for the two correlated BS antennas are presented herein.
文摘In this paper Pi2 pulsations at Zhongshan Station of Antarctica are analyzed from October 1 - 31, 1996. Their characteristics e. g. occurrence frequency,frequency, and polarization are studied. The characteristics of Pi2 pulsations are summerized as follows: (1 ) Pi2 pulsations at Zhongshan Station usually take place from 2000 MLT to 0200 MLT; the main frequencies are between 6. 79 mHz and 13. 58mHZ; (2 ) Pi2 pulsations with low frequencies are dominent. The range of main frequencies becomes narrow at midnight; (3) The Polarization of Pi2 pulsations are almost linear; (4) About the orientation of major axes the NW-SE direction is dominent before 2200 MLT and NE-SW is dominent after 2200 MLT. The generation mechanism of Pi2 pulsations at Zhongshan Station is discussed theoretically.
基金Sponsored by the National Natural Science Foundation of China(51708004)Beijing Youth Teaching Master Team Construction Project(108051360023XN261)Yuyou Talent Training Program of North China University of Technology(215051360020XN160/009).
文摘4 elderly care service stations in Zhanlan Road Street,Xicheng District,Beijing are selected,and questionnaires are designed and distributed to the surrounding elderly population to understand their needs and satisfaction with the station environment.By observing elderly care service stations on site,the characteristics,obstacles,and shortcomings of the environment are recorded,and relevant data are collected and analyzed,such as the characteristics of the elderly population being interviewed,the planning and design data of the station environment,and the distribution of service facilities.The overall characteristics of the spatial environment of elderly care stations are summarized,and renovation measures and optimization suggestions are provided for the current shortcomings,thereby providing some basis for the spatial design of community elderly care service stations in the future.
文摘The rapid development of the“Internet+”has ushered in a new era of global digital technology innovation.Concurrent with the deepening trends of economic globalization and integration,international trade is progressively undergoing extensive digitization,with cross-border e-commerce emerging as a significant manifestation of this transformation.Within this landscape,the cross-border e-commerce B2B platform is anticipated to become a pivotal driver for China’s cross-border trade growth,representing a strategic opportunity for trade transformation.This paper provides a comprehensive examination of the concepts,characteristics,and development status of cross-border e-commerce and B2B platforms,considering both global and Chinese perspectives.Focusing on a prominent case study,Alibaba International Station,a B2B cross-border e-commerce platform,the paper delves into its business model and core competencies,offering a thorough analysis of its role in the intricacies of international e-commerce and its contribution to the field.Drawing on insights gained,the paper concludes by presenting targeted recommendations from both the platform and government perspectives.These suggestions are informed by a nuanced understanding of the development opportunities and challenges facing China’s cross-border e-commerce B2B platforms.
文摘目的观察胰岛素泵对老年2型糖尿病患者临床疗效的影响。方法65例老年2型糖尿病患者作为观察样本,利用随机数字表法进行分组,其中接受胰岛素皮下注射治疗的患者组成常规组(32例),接受胰岛素泵注射治疗患者组成研究组(33例)。比较两组患者临床治疗效果及血糖指标[糖化血红蛋白(HbA1c)、空腹血糖(FPG)以及餐后2 h血糖(2 h PG)]、血脂指标[低密度脂蛋白胆固醇(LDL-C)、总胆固醇(TC)、高密度脂蛋白胆固醇(HDL-C)以及甘油三酯(TG)]水平。结果研究组患者治疗总有效率96.97%高于常规组的81.25%(P<0.05)。治疗后,研究组患者FPG(5.15±1.11)mmol/L、2 h PG(9.65±1.22)mmol/L、HbA1c(6.07±1.15)%低于常规组的(6.52±1.12)mmol/L、(11.43±1.26)mmol/L、(7.43±1.14)%(P<0.05)。治疗后,研究组患者TG(1.06±0.12)mmol/L、TC(2.04±0.22)mmol/L、LDL-C(1.02±0.15)mmol/L低于常规组的(1.86±0.14)、(3.75±0.13)、(2.58±0.11)mmol/L,HDL-C(1.64±0.25)mmol/L高于常规组的(1.24±0.24)mmol/L(P<0.05)。结论对于老年2型糖尿病患者来说,应采用胰岛素泵注射治疗干预,这种治疗方式可以改善患者的血脂水平以及血糖水平,提升患者的临床治疗效果,应用效果显著。
