This research aims to optimize the utilization of long-term sea level data from the TOPEX/Poseidon,Jason1,Jason2,and Jason3 altimetry missions for tidal modeling.We generate a time series of along-track observations a...This research aims to optimize the utilization of long-term sea level data from the TOPEX/Poseidon,Jason1,Jason2,and Jason3 altimetry missions for tidal modeling.We generate a time series of along-track observations and apply a developed method to produce tidal models with specific tidal constituents for each location.Our tidal modeling methodology follows an iterative process:partitioning sea surface height(SSH)observations into analysis/training and prediction/validation parts and ultimately identi-fying the set of tidal constituents that provide the best predictions at each time series location.The study focuses on developing 1256 time series along the altimetry tracks over the Baltic Sea,each with its own set of tidal constituents.Verification of the developed tidal models against the sSH observations within the prediction/validation part reveals mean absolute error(MAE)values ranging from 0.0334 m to 0.1349 m,with an average MAE of 0.089 m.The same validation process is conducted on the FES2014 and EOT20 global tidal models,demonstrating that our tidal model,referred to as BT23(short for Baltic Tide 2023),outperforms both models with an average MAE improvement of 0.0417 m and 0.0346 m,respectively.In addition to providing details on the development of the time series and the tidal modeling procedure,we offer the 1256 along-track time series and their associated tidal models as supplementary materials.We encourage the satellite altimetry community to utilize these resources for further research and applications.展开更多
Atmospheric models are physical equations based on the ideal gas law. Applied to the atmosphere, this law yields equations for water, vapor (gas), ice, air, humidity, dryness, fire, and heat, thus defining the model o...Atmospheric models are physical equations based on the ideal gas law. Applied to the atmosphere, this law yields equations for water, vapor (gas), ice, air, humidity, dryness, fire, and heat, thus defining the model of key atmospheric parameters. The distribution of these parameters across the entire planet Earth is the origin of the formation of the climatic cycle, which is a normal climatic variation. To do this, the Earth is divided into eight (8) parts according to the number of key parameters to be defined in a physical representation of the model. Following this distribution, numerical models calculate the constants for the formation of water, vapor, ice, dryness, thermal energy (fire), heat, air, and humidity. These models vary in complexity depending on the indirect trigonometric direction and simplicity in the sum of neighboring models. Note that the constants obtained from the equations yield 275.156˚K (2.006˚C) for water, 273.1596˚K (0.00963˚C) for vapor, 273.1633˚K (0.0133˚C) for ice, 0.00365 in/s for atmospheric dryness, 1.996 in<sup>2</sup>/s for humidity, 2.993 in<sup>2</sup>/s for air, 1 J for thermal energy of fire, and 0.9963 J for heat. In summary, this study aims to define the main parameters and natural phenomena contributing to the modification of planetary climate. .展开更多
In the R&D phase of Gravity-1(YL-1), a multi-domain modeling and simulation technology based on Modelica language was introduced, which was a recent attempt in the practice of modeling and simulation method for la...In the R&D phase of Gravity-1(YL-1), a multi-domain modeling and simulation technology based on Modelica language was introduced, which was a recent attempt in the practice of modeling and simulation method for launch vehicles in China. It realizes a complex coupling model within a unified model for different domains, so that technologists can work on one model. It ensured the success of YL-1 first launch mission, supports rapid iteration, full validation, and tight design collaboration.展开更多
目的:应用肌性斜颈兔动物模型,探讨针刀治疗肌性斜颈的作用机制及意义。方法:无水酒精注射制备动物肌性斜颈兔子模型后,选取模型兔子48只,随机分为正常组、模型组、针刀组、按摩组,每组12只。分别给予各组对应治疗,治疗2个月后各组分别...目的:应用肌性斜颈兔动物模型,探讨针刀治疗肌性斜颈的作用机制及意义。方法:无水酒精注射制备动物肌性斜颈兔子模型后,选取模型兔子48只,随机分为正常组、模型组、针刀组、按摩组,每组12只。分别给予各组对应治疗,治疗2个月后各组分别取部分胸锁乳突肌制作标本,免疫组化法观察钙蛋白酶1(calpain-1)、分化抗原决定簇45(CD45)、基质金属蛋白酶2(matrix metalloproteinase-2,MMP-2)、基质金属蛋白酶抑制因子2(tissue inhibitor of metalloproteinases-2,TIMP-2)在各组肌纤维中的表达情况。结果:与正常组比较,其余各组实验动物明显出现颈部活动受限、斜颈、头颈不对称症状,而治疗结束后,针刀组和按摩组实验动物颈部活动受限改善,无明显头颈不对称症状。calpain-1、CD45、TIMP-2的表达,与正常组比较,模型组、按摩组上调(P<0.01);与模型组比较,针刀组、按摩组下调(P<0.01);与针刀组比较,按摩组上调(P<0.01)。MMP-2表达,与正常组比较,模型组下调(P<0.01),与模型组比较,针刀组、按摩组上调(P<0.05)。结论:针刀治疗肌性斜颈效果显著,其作用机制可能与减少calpain-1、CD45、TIMP-2表达,增加MMP-2表达有关。展开更多
A flexible two degrees of freedom (2-DOF) steering model of multi-axlevehicle (MAV) is presented with considering the effect of frame flexibility based on the classic2-DOF model. A method to calculate the frame flexib...A flexible two degrees of freedom (2-DOF) steering model of multi-axlevehicle (MAV) is presented with considering the effect of frame flexibility based on the classic2-DOF model. A method to calculate the frame flexibility is derived by using three moments equation.The steering stability of MAV is analyzed. The steering performance of MAV is also researched infrequency domain. Simulation results show that the dynamic effects of flexible model are more severethan rigid model and the flexible effect of frame will weaken the steering stability of MAV.Different disposals of steering axles lead to different steering characteristics of MAV. Thein-phase steering mode improves the steering characteristics and stability at high speed. Theanti-phase steering mode increases the steering mobility at low vehicle speed.展开更多
BACKGROUND In recent years,studies have found that the occurrence and development of diabetic cardiomyopathy(DCM)is closely related to an increase in polyadenosine diphosphate-ribose polymerase-1(PARP-1)activity.PARP-...BACKGROUND In recent years,studies have found that the occurrence and development of diabetic cardiomyopathy(DCM)is closely related to an increase in polyadenosine diphosphate-ribose polymerase-1(PARP-1)activity.PARP-1 activation could be involved in the pathophysiological process of DCM by promoting oxidative stress,the inflammatory response,apoptosis and myocardial fibrosis.AIM To investigate the mechanism of liraglutide in improving myocardial injury in type 2 diabetic rats,further clarified the protective effect of liraglutide on the heart,and provided a new option for the treatment of DCM.METHODS Forty healthy male SD rats aged 6 wk were randomly divided into two groups,a normal control group(n=10)and a model group(n=30),which were fed an ordinary diet and a high-sugar and high-fat diet,respectively.After successful modeling,the rats in the model group were fed a high-glucose and high-fat diet for 4 wk and randomly divided into a model group and an intervention group(further divided into a high-dose group and a low-dose group).The rats were fed a high-glucose and high-fat diet for 8 wk and then started drug intervention.Blood samples were collected from the abdominal aorta to detect fasting blood glucose and lipid profiles.Intact heart tissue was dissected,and its weight was used to calculate the heart weight index.Haematoxylin and eosin staining was used to observe the pathological changes in the myocardium and the expression of PARP-1 in the heart by immunohistochemistry.RESULTS The body weight and heart weight index of rats in the model group were significantly increased compared with those in the normal control group,and those in the intervention group were decreased compared with those in the model group,with a more obvious decrease observed in the high-dose group(P<0.05).In the model group,myocardial fibers were disordered,and inflammatory cells and interstitial fibrosis were observed.The cardiomyopathy of rats in the intervention group was improved to different degrees,the myocardial fibers were arranged neatly,and the myocardial cells were clearly striated;the improvement was more obvious in the high-dose group.Compared with the normal control group,the expression of PARP-1 in myocardial tissue of the model group was increased,and the difference was statistically significant(P<0.05).After liraglutide intervention,compared with the model group,the expression of PARP-1 in myocardial tissue was decreased,and the reduction was more obvious in the high-dose group(P<0.05)but still higher than that in the normal control group.CONCLUSION Liraglutide may improve myocardial injury in type 2 diabetic rats by inhibiting the expression of myocardial PARP-1 in a dose-dependent manner.展开更多
目的分析达格列净治疗2型糖尿病(T2DM)对患者糖脂水平和胰岛素指标及血清网膜素-1的影响及血清网膜素-1与稳态模型评估-胰岛素抵抗指数(HOMA-IR)的相关性。方法选取2018年11月至2019年10月于长江大学附属仙桃市第一人民医院内分泌科收治...目的分析达格列净治疗2型糖尿病(T2DM)对患者糖脂水平和胰岛素指标及血清网膜素-1的影响及血清网膜素-1与稳态模型评估-胰岛素抵抗指数(HOMA-IR)的相关性。方法选取2018年11月至2019年10月于长江大学附属仙桃市第一人民医院内分泌科收治的46例T2DM患者作为观察组,另选取同期32名健康志愿者作为对照组。采用酶联免疫吸附试验(ELISA)测定两组血清omentin-1水平,比较观察组治疗前与对照组及观察组治疗前后体重指数(BMI)、腰臀比(WHR)、血压、糖脂水平、胰岛素指标及血清omentin-1水平,分析T2DM患者治疗前后omentin-1水平与HOMA-IR的相关性。结果观察组治疗前与对照组BMI、WHR、收缩压(SBP)、舒张压(DBP)、总胆固醇(TC)、三酰甘油(TG)水平比较差异均无统计学意义;观察组治疗前空腹血糖(FBG)、餐后2 h血糖(2 h PG)、糖化血红蛋白(HbA1c)、空腹胰岛素(FINS)水平及HOMA-IR均高于对照组,稳态模型评估-胰岛β细胞功能指数(HOMA-β)、血清omentin-1水平均低于对照组,差异有统计学意义(P<0.05)。治疗后,观察组WHR、BMI、FBG、2 h PG、HbA1c、HOMA-IR水平均低于治疗前,HOMA-β、血清omentin-1水平均高于治疗前,差异有统计学意义(P<0.05)。Pearson直线相关分析结果显示,T2DM患者血清omentin-1水平与HOMA-IR呈负相关(r<0,P<0.05)。结论T2DM患者糖脂、血清omentin-1水平和胰岛β细胞功能异常,血清omentin-1与HOMA-IR呈负相关,达格列净能有效降低T2DM患者糖脂水平,提高血清omentin-1水平,进而可改善胰岛β细胞功能。展开更多
We study the localized coherent structures ofa generally nonintegrable (2+ 1 )-dimensional KdV equation via a variable separation approach. In a special integrable case, the entrance of some arbitrary functions leads ...We study the localized coherent structures ofa generally nonintegrable (2+ 1 )-dimensional KdV equation via a variable separation approach. In a special integrable case, the entrance of some arbitrary functions leads to abundant coherent structures. However, in the general nonintegrable case, an additional condition has to be introduced for these arbitrary functions. Although the additional condition has been introduced into the solutions of the nonintegrable KdV equation, there still exist many interesting solitary wave structures. Especially, the nonintegrable KdV equation possesses the breather-like localized excitations, and the similar static ring soliton solutions as in the integrable case. Furthermor,in the integrable case, the interaction between two travelling ring solitons is elastic, while in the nonintegrable case we cannot find even the single travelling ring soliton solution.展开更多
Accumulating evidence has demonstrated that the sodium-potassium-chloride co-transporter 1 and potassium-chloride co-transporter 2 have a role in the modulation of pain transmission at the spinal level through chlorid...Accumulating evidence has demonstrated that the sodium-potassium-chloride co-transporter 1 and potassium-chloride co-transporter 2 have a role in the modulation of pain transmission at the spinal level through chloride regulation in the pain pathway and by effecting neuronal excitability and pain sensitization. The present study aimed to investigate the analgesic effect of the speciifc sodium-potassium-chloride co-transporter 1 inhibitor bumetanide, and the change in spinal sodium-potassium-chloride co-transporter 1 and potassium-chloride co-transporter 2 expression in a rat model of incisional pain. Results showed that intrathecal bumetanide could decrease cumulative pain scores, and could increase thermal and mechanical pain thresholds in a rat model of incisional pain. Sodium-potassium-chloride co-transporter 1 expression in-creased in neurons from dorsal root ganglion and the deep laminae of the ipsilateral dorsal horn following incision. By contrast, potassium-chloride co-transporter 2 expression decreased in neurons of the deep laminae from the ipsilateral dorsal horn. These ifndings suggest that spinal sodium-potassium-chloride co-transporter 1 expression was up-regulated and spinal potassi-um-chloride co-transporter 2 expression was down-regulated following incision. Intrathecal bumetanide has analgesic effects on incisional pain through inhibition of sodium-potassi-um-chloride co-transporter 1.展开更多
文摘This research aims to optimize the utilization of long-term sea level data from the TOPEX/Poseidon,Jason1,Jason2,and Jason3 altimetry missions for tidal modeling.We generate a time series of along-track observations and apply a developed method to produce tidal models with specific tidal constituents for each location.Our tidal modeling methodology follows an iterative process:partitioning sea surface height(SSH)observations into analysis/training and prediction/validation parts and ultimately identi-fying the set of tidal constituents that provide the best predictions at each time series location.The study focuses on developing 1256 time series along the altimetry tracks over the Baltic Sea,each with its own set of tidal constituents.Verification of the developed tidal models against the sSH observations within the prediction/validation part reveals mean absolute error(MAE)values ranging from 0.0334 m to 0.1349 m,with an average MAE of 0.089 m.The same validation process is conducted on the FES2014 and EOT20 global tidal models,demonstrating that our tidal model,referred to as BT23(short for Baltic Tide 2023),outperforms both models with an average MAE improvement of 0.0417 m and 0.0346 m,respectively.In addition to providing details on the development of the time series and the tidal modeling procedure,we offer the 1256 along-track time series and their associated tidal models as supplementary materials.We encourage the satellite altimetry community to utilize these resources for further research and applications.
文摘Atmospheric models are physical equations based on the ideal gas law. Applied to the atmosphere, this law yields equations for water, vapor (gas), ice, air, humidity, dryness, fire, and heat, thus defining the model of key atmospheric parameters. The distribution of these parameters across the entire planet Earth is the origin of the formation of the climatic cycle, which is a normal climatic variation. To do this, the Earth is divided into eight (8) parts according to the number of key parameters to be defined in a physical representation of the model. Following this distribution, numerical models calculate the constants for the formation of water, vapor, ice, dryness, thermal energy (fire), heat, air, and humidity. These models vary in complexity depending on the indirect trigonometric direction and simplicity in the sum of neighboring models. Note that the constants obtained from the equations yield 275.156˚K (2.006˚C) for water, 273.1596˚K (0.00963˚C) for vapor, 273.1633˚K (0.0133˚C) for ice, 0.00365 in/s for atmospheric dryness, 1.996 in<sup>2</sup>/s for humidity, 2.993 in<sup>2</sup>/s for air, 1 J for thermal energy of fire, and 0.9963 J for heat. In summary, this study aims to define the main parameters and natural phenomena contributing to the modification of planetary climate. .
文摘In the R&D phase of Gravity-1(YL-1), a multi-domain modeling and simulation technology based on Modelica language was introduced, which was a recent attempt in the practice of modeling and simulation method for launch vehicles in China. It realizes a complex coupling model within a unified model for different domains, so that technologists can work on one model. It ensured the success of YL-1 first launch mission, supports rapid iteration, full validation, and tight design collaboration.
文摘目的:应用肌性斜颈兔动物模型,探讨针刀治疗肌性斜颈的作用机制及意义。方法:无水酒精注射制备动物肌性斜颈兔子模型后,选取模型兔子48只,随机分为正常组、模型组、针刀组、按摩组,每组12只。分别给予各组对应治疗,治疗2个月后各组分别取部分胸锁乳突肌制作标本,免疫组化法观察钙蛋白酶1(calpain-1)、分化抗原决定簇45(CD45)、基质金属蛋白酶2(matrix metalloproteinase-2,MMP-2)、基质金属蛋白酶抑制因子2(tissue inhibitor of metalloproteinases-2,TIMP-2)在各组肌纤维中的表达情况。结果:与正常组比较,其余各组实验动物明显出现颈部活动受限、斜颈、头颈不对称症状,而治疗结束后,针刀组和按摩组实验动物颈部活动受限改善,无明显头颈不对称症状。calpain-1、CD45、TIMP-2的表达,与正常组比较,模型组、按摩组上调(P<0.01);与模型组比较,针刀组、按摩组下调(P<0.01);与针刀组比较,按摩组上调(P<0.01)。MMP-2表达,与正常组比较,模型组下调(P<0.01),与模型组比较,针刀组、按摩组上调(P<0.05)。结论:针刀治疗肌性斜颈效果显著,其作用机制可能与减少calpain-1、CD45、TIMP-2表达,增加MMP-2表达有关。
文摘A flexible two degrees of freedom (2-DOF) steering model of multi-axlevehicle (MAV) is presented with considering the effect of frame flexibility based on the classic2-DOF model. A method to calculate the frame flexibility is derived by using three moments equation.The steering stability of MAV is analyzed. The steering performance of MAV is also researched infrequency domain. Simulation results show that the dynamic effects of flexible model are more severethan rigid model and the flexible effect of frame will weaken the steering stability of MAV.Different disposals of steering axles lead to different steering characteristics of MAV. Thein-phase steering mode improves the steering characteristics and stability at high speed. Theanti-phase steering mode increases the steering mobility at low vehicle speed.
基金Supported by Shanxi Provincial Natural Science Foundation,No.201701D121159Shanxi Provincial Health and Family Planning Commission,No.2014016Health Commission of Shanxi Province,No.2019020.
文摘BACKGROUND In recent years,studies have found that the occurrence and development of diabetic cardiomyopathy(DCM)is closely related to an increase in polyadenosine diphosphate-ribose polymerase-1(PARP-1)activity.PARP-1 activation could be involved in the pathophysiological process of DCM by promoting oxidative stress,the inflammatory response,apoptosis and myocardial fibrosis.AIM To investigate the mechanism of liraglutide in improving myocardial injury in type 2 diabetic rats,further clarified the protective effect of liraglutide on the heart,and provided a new option for the treatment of DCM.METHODS Forty healthy male SD rats aged 6 wk were randomly divided into two groups,a normal control group(n=10)and a model group(n=30),which were fed an ordinary diet and a high-sugar and high-fat diet,respectively.After successful modeling,the rats in the model group were fed a high-glucose and high-fat diet for 4 wk and randomly divided into a model group and an intervention group(further divided into a high-dose group and a low-dose group).The rats were fed a high-glucose and high-fat diet for 8 wk and then started drug intervention.Blood samples were collected from the abdominal aorta to detect fasting blood glucose and lipid profiles.Intact heart tissue was dissected,and its weight was used to calculate the heart weight index.Haematoxylin and eosin staining was used to observe the pathological changes in the myocardium and the expression of PARP-1 in the heart by immunohistochemistry.RESULTS The body weight and heart weight index of rats in the model group were significantly increased compared with those in the normal control group,and those in the intervention group were decreased compared with those in the model group,with a more obvious decrease observed in the high-dose group(P<0.05).In the model group,myocardial fibers were disordered,and inflammatory cells and interstitial fibrosis were observed.The cardiomyopathy of rats in the intervention group was improved to different degrees,the myocardial fibers were arranged neatly,and the myocardial cells were clearly striated;the improvement was more obvious in the high-dose group.Compared with the normal control group,the expression of PARP-1 in myocardial tissue of the model group was increased,and the difference was statistically significant(P<0.05).After liraglutide intervention,compared with the model group,the expression of PARP-1 in myocardial tissue was decreased,and the reduction was more obvious in the high-dose group(P<0.05)but still higher than that in the normal control group.CONCLUSION Liraglutide may improve myocardial injury in type 2 diabetic rats by inhibiting the expression of myocardial PARP-1 in a dose-dependent manner.
文摘目的分析达格列净治疗2型糖尿病(T2DM)对患者糖脂水平和胰岛素指标及血清网膜素-1的影响及血清网膜素-1与稳态模型评估-胰岛素抵抗指数(HOMA-IR)的相关性。方法选取2018年11月至2019年10月于长江大学附属仙桃市第一人民医院内分泌科收治的46例T2DM患者作为观察组,另选取同期32名健康志愿者作为对照组。采用酶联免疫吸附试验(ELISA)测定两组血清omentin-1水平,比较观察组治疗前与对照组及观察组治疗前后体重指数(BMI)、腰臀比(WHR)、血压、糖脂水平、胰岛素指标及血清omentin-1水平,分析T2DM患者治疗前后omentin-1水平与HOMA-IR的相关性。结果观察组治疗前与对照组BMI、WHR、收缩压(SBP)、舒张压(DBP)、总胆固醇(TC)、三酰甘油(TG)水平比较差异均无统计学意义;观察组治疗前空腹血糖(FBG)、餐后2 h血糖(2 h PG)、糖化血红蛋白(HbA1c)、空腹胰岛素(FINS)水平及HOMA-IR均高于对照组,稳态模型评估-胰岛β细胞功能指数(HOMA-β)、血清omentin-1水平均低于对照组,差异有统计学意义(P<0.05)。治疗后,观察组WHR、BMI、FBG、2 h PG、HbA1c、HOMA-IR水平均低于治疗前,HOMA-β、血清omentin-1水平均高于治疗前,差异有统计学意义(P<0.05)。Pearson直线相关分析结果显示,T2DM患者血清omentin-1水平与HOMA-IR呈负相关(r<0,P<0.05)。结论T2DM患者糖脂、血清omentin-1水平和胰岛β细胞功能异常,血清omentin-1与HOMA-IR呈负相关,达格列净能有效降低T2DM患者糖脂水平,提高血清omentin-1水平,进而可改善胰岛β细胞功能。
文摘We study the localized coherent structures ofa generally nonintegrable (2+ 1 )-dimensional KdV equation via a variable separation approach. In a special integrable case, the entrance of some arbitrary functions leads to abundant coherent structures. However, in the general nonintegrable case, an additional condition has to be introduced for these arbitrary functions. Although the additional condition has been introduced into the solutions of the nonintegrable KdV equation, there still exist many interesting solitary wave structures. Especially, the nonintegrable KdV equation possesses the breather-like localized excitations, and the similar static ring soliton solutions as in the integrable case. Furthermor,in the integrable case, the interaction between two travelling ring solitons is elastic, while in the nonintegrable case we cannot find even the single travelling ring soliton solution.
基金supported by a grant from Guangzhou Medical University,No.2008C24
文摘Accumulating evidence has demonstrated that the sodium-potassium-chloride co-transporter 1 and potassium-chloride co-transporter 2 have a role in the modulation of pain transmission at the spinal level through chloride regulation in the pain pathway and by effecting neuronal excitability and pain sensitization. The present study aimed to investigate the analgesic effect of the speciifc sodium-potassium-chloride co-transporter 1 inhibitor bumetanide, and the change in spinal sodium-potassium-chloride co-transporter 1 and potassium-chloride co-transporter 2 expression in a rat model of incisional pain. Results showed that intrathecal bumetanide could decrease cumulative pain scores, and could increase thermal and mechanical pain thresholds in a rat model of incisional pain. Sodium-potassium-chloride co-transporter 1 expression in-creased in neurons from dorsal root ganglion and the deep laminae of the ipsilateral dorsal horn following incision. By contrast, potassium-chloride co-transporter 2 expression decreased in neurons of the deep laminae from the ipsilateral dorsal horn. These ifndings suggest that spinal sodium-potassium-chloride co-transporter 1 expression was up-regulated and spinal potassi-um-chloride co-transporter 2 expression was down-regulated following incision. Intrathecal bumetanide has analgesic effects on incisional pain through inhibition of sodium-potassi-um-chloride co-transporter 1.
