1研究背景将卫星遥感红外资料应用于地震监测,起始于20世纪80年代前苏联科学家。后续国内外学者陆续开展了这方面的研究,提出了涡度、RST、ZS、距平和功率谱等异常提取方法,取得了大量震例和机理方面的研究成果(张元生等,2002;Tramutoli...1研究背景将卫星遥感红外资料应用于地震监测,起始于20世纪80年代前苏联科学家。后续国内外学者陆续开展了这方面的研究,提出了涡度、RST、ZS、距平和功率谱等异常提取方法,取得了大量震例和机理方面的研究成果(张元生等,2002;Tramutoli et al,2005;Ouzounov et al,2007;Freund,2011;Jing et al,2022)。张铁宝等(2016)研究表明,川滇块体东边界带强震前,川滇块体存在显著的超阈值辐射增强异常。利用该地区通过震例总结得到的红外辐射异常特征,持续对川滇块体红外辐射进行了多年跟踪,在2022年9月5日四川泸定M_(S)6.8地震前,川滇块体又再次出现了类似的异常变化。泸定地震发生在川滇块体东边界的鲜水河断裂带磨西段。本研究主要分析泸定地震前红外辐射的异常变化。展开更多
BACKGROUND When herpes zoster is complicated with paralytic ileus,this mostly involves acute intestinal pseudo-obstruction of Ogilvie’s syndrome manifesting as obvious dilatation of the cecum and right colon;small in...BACKGROUND When herpes zoster is complicated with paralytic ileus,this mostly involves acute intestinal pseudo-obstruction of Ogilvie’s syndrome manifesting as obvious dilatation of the cecum and right colon;small intestinal obstruction is rare.Here,we present a patient with a very rare case of small bowel pseudo-obstruction.CASE SUMMARY A 76-year-old female patient complained of right upper quadrant pain.Two days later,a blistering,right-sided rash of the thoracoabdominal dermatome(T5-T10) emerged in conjunction with small intestinal dilatation and the inability to defecate.Computed tomography of the abdomen confirmed small bowel pseudoobstruction.Antiviral therapy,gastrointestinal decompression,and enemas proved unproductive.After 4 d of stagnation,an epidural block was performed for pain relief and prompted the passage of gas and stool,resolving the obstructive problem.Three days later,the rash appeared dry and crusted,and the pain diminished.After 5 d,no abnormality was visible by gastroenteroscopy,and the patient was discharged on day 7.CONCLUSION This case shows that herpes zoster may induce small bowel pseudo-obstruction in addition to colonic pseudo-obstruction.Epidural block can not only treat intercostal neuralgia but also resolve small bowel pseudo-obstruction caused by herpes zoster.展开更多
It was not until 1979 that Bayes de Ltma described atrial conduction blocks and classified them as interatrial and intra- atrial.Interatrial blocks refer to conduction disorders lo- cated between the atria, while intr...It was not until 1979 that Bayes de Ltma described atrial conduction blocks and classified them as interatrial and intra- atrial.Interatrial blocks refer to conduction disorders lo- cated between the atria, while intraalxial blocks occur within the same atrium. This work motivated several authors, in- cluding Bayes himself, to further investigate atrial conduc- tion and interatrial block （IAB）.展开更多
The most commonly used method for assessing the hydraulic erodibility of rock is Annandale's method.This method is based on a correlation between the erosive force of flowing water and the capacity of rock resista...The most commonly used method for assessing the hydraulic erodibility of rock is Annandale's method.This method is based on a correlation between the erosive force of flowing water and the capacity of rock resistance. This capacity is evaluated using Kirsten's index, which was initially developed to evaluate the excavatability of earth materials. For rocky material, this index is determined according to certain geomechanical factors related to intact rock and rock mass, such as compressive strength of intact rock, rock block size, discontinuity shear strength and relative block structure. To quantify the relative block structure, Kirsten(1982) developed a mathematical expression that accounts for the shape and orientation of the blocks relative to the direction of flow. Kirsten's initial concept for assessing the relative block structure considers that the geological formation is mainly fractured by two joint sets forming an orthogonally fractured system. An adjusted concept is proposed to determine the relative block structure when the fractured system is non-orthogonal where the angle between the planes of the two joint sets is greater or less than 90°. An analysis of the proposed relative block structure rating shows that considering a non-orthogonally fractured system has a significant effect on Kirsten's index and, as a consequence, on the assessment of the hydraulic erodibility of rock.展开更多
Using pure S wave fitting method, we studied the shear wave velocity structures under the Ordos block and its eastern and southern marginal areas. The results show that the velocity structure beneath Yulin station in ...Using pure S wave fitting method, we studied the shear wave velocity structures under the Ordos block and its eastern and southern marginal areas. The results show that the velocity structure beneath Yulin station in the interior of Ordos block is relatively stable, where no apparent change between high and low velocity layers exists and the shear wave velocity increases steadily with the depth. There is a 12km thick layer at the depth of 25km under this station, with an S wave velocity (V S=3.90km/s) lower than that at the same depth in its eastern and southern areas (V S≥4.00km/s). The crust under the eastern margin of Ordos block is thicker than that of the Yulin station, and the velocity structures alternate between the high and low velocity layers, with more low velocity layers. It has the same characteristic as having a 10km-thick low velocity layer (V S=3.80km/s) in the lower crust but buried at a depth of about 35km. Moreover, we studied the V P/V S ratio under each station in combination with the result of P wave velocity inversion. The results show that, the average velocity ratio of the Yulin station at the interior of Ordos block is only 1.68, with a very low ratio (about 1.60) in the upper crust and a stable ratio of about 1.73 in the mid and lower crust, which indicates the media under this station is homogenous and stable, being in a state of rigidity. But at the stations in the eastern and southern margins of the Ordos block, several layers of high velocity ratio (about 1.80) have been found, in which the average velocity ratio under Kelan and Lishi stations at the eastern margin is systemically higher than that of the general elastical body waves (1.732). This reflects that the crust under the marginal areas is more active relatively, and other materials may exist in these layers. Finally, we discussed the relationship among earthquakes, velocity structures beneath stations and faults.展开更多
The traditional combinatorial designs can be used as basic designs for constructing designs of computer experiments which have been used successfully till now in various domains such as engineering, pharmaceutical ind...The traditional combinatorial designs can be used as basic designs for constructing designs of computer experiments which have been used successfully till now in various domains such as engineering, pharmaceutical industry, etc. In this paper, a new series of generalized partially balanced incomplete blocks PBIB designs with m associated classes (m = 4, 5 and 7) based on new generalized association schemes with number of treatments v arranged in w arrays of n rows and l columns (w ≥ 2, n ≥ 2, l ≥ 2) is defined. Some construction methods of these new PBIB are given and their parameters are specified using the Combinatory Method (s). For n or l even and s divisor of n or l, the obtained PBIB designs are resolvable PBIB designs. So the Fang RBIBD method is applied to obtain a series of particular U-type designs U (wnl;) (r is the repetition number of each treatment in our resolvable PBIB design).展开更多
Pelagic copepods play an important role in the marine food web. However, a full understanding of the ecological status of this zooplankton group depends on the careful study of their natural diets. In previous PCR-bas...Pelagic copepods play an important role in the marine food web. However, a full understanding of the ecological status of this zooplankton group depends on the careful study of their natural diets. In previous PCR-based copepod diet studies, we found many apostome ciliates that live symbiotically under the exoskeleton of the copepods, and their sequences were often over-represented in the 18S rRNA gene （18S rDNA） libraries. As a first step to address this issue, we designed three apostome ciliate 18S rDNA blocking primers, and tested their blocking efficiency against apostome ciliate 18S rDNA under various PCR conditions. Using a semi-quantitative PCR method, we optimized the conditions to efficiently amplify the 18S rDNA of the prey while simultaneously excluding the symbiotic apostome ciliates. This technique will facilitate PCR-based diet studies of copepods and other zooplankton in their natural environments.展开更多
In response to the problem of the high cost and low efficiency of traditional water surface litter cleanup through manpower,a lightweight water surface litter detection algorithm based on improved YOLOv5s is proposed ...In response to the problem of the high cost and low efficiency of traditional water surface litter cleanup through manpower,a lightweight water surface litter detection algorithm based on improved YOLOv5s is proposed to provide core technical support for real-time water surface litter detection by water surface litter cleanup vessels.The method reduces network parameters by introducing the deep separable convolution GhostConv in the lightweight network GhostNet to substitute the ordinary convolution in the original YOLOv5s feature extraction and fusion network;introducing the C3Ghost module to substitute the C3 module in the original backbone and neck networks to further reduce computational effort.Using a Convolutional Block Attention Mechanism(CBAM)module in the backbone network to strengthen the network’s ability to extract significant target features from images.Finally,the loss function is optimized using the Focal-EIoU loss func-tion to improve the convergence speed and model accuracy.The experimental results illustrate that the improved algorithm outperforms the original Yolov5s in all aspects of the homemade water surface litter dataset and has certain advantages over some current mainstream algorithms in terms of model size,detection accuracy,and speed,which can deal with the problems of real-time detection of water surface litter in real life.展开更多
BACKGROUND Neuralgia is frequently noted in patients with Kummell’s disease,and its mechanism is complex,rendering it challenging to treat.Percutaneous kyphoplasty(PKP)has been widely used to treat osteoporotic verte...BACKGROUND Neuralgia is frequently noted in patients with Kummell’s disease,and its mechanism is complex,rendering it challenging to treat.Percutaneous kyphoplasty(PKP)has been widely used to treat osteoporotic vertebral compression fractures with satisfactory outcomes.However,it is not optimal for managing severely collapsed vertebrae,as cement injection may not be feasible.This report describes the use of a selective nerve block for the treatment of neuralgia caused by severely collapsed vertebrae in a patient with Kummell’s disease.CASE SUMMARY In our patient,three vertebrae were involved.The collapse of T11 was particularly severe.After managing T8 and T9 using PKP,these two segments were effectively strengthened;consequently,back pain was significantly relieved.However,the structure and strength of T11 could not be effectively restored using a minimally invasive surgical method because there was little room for cement injection.This caused obvious neuralgia according to the postoperative status of the PKP.Thus,we performed selective nerve blocks for the treatment of neuralgia,which resulted in satisfactory outcomes.CONCLUSION Selective nerve block may be a possible therapeutic strategy for neuralgia due to severely collapsed vertebrae in Kummell’s disease.展开更多
文摘1研究背景将卫星遥感红外资料应用于地震监测,起始于20世纪80年代前苏联科学家。后续国内外学者陆续开展了这方面的研究,提出了涡度、RST、ZS、距平和功率谱等异常提取方法,取得了大量震例和机理方面的研究成果(张元生等,2002;Tramutoli et al,2005;Ouzounov et al,2007;Freund,2011;Jing et al,2022)。张铁宝等(2016)研究表明,川滇块体东边界带强震前,川滇块体存在显著的超阈值辐射增强异常。利用该地区通过震例总结得到的红外辐射异常特征,持续对川滇块体红外辐射进行了多年跟踪,在2022年9月5日四川泸定M_(S)6.8地震前,川滇块体又再次出现了类似的异常变化。泸定地震发生在川滇块体东边界的鲜水河断裂带磨西段。本研究主要分析泸定地震前红外辐射的异常变化。
文摘BACKGROUND When herpes zoster is complicated with paralytic ileus,this mostly involves acute intestinal pseudo-obstruction of Ogilvie’s syndrome manifesting as obvious dilatation of the cecum and right colon;small intestinal obstruction is rare.Here,we present a patient with a very rare case of small bowel pseudo-obstruction.CASE SUMMARY A 76-year-old female patient complained of right upper quadrant pain.Two days later,a blistering,right-sided rash of the thoracoabdominal dermatome(T5-T10) emerged in conjunction with small intestinal dilatation and the inability to defecate.Computed tomography of the abdomen confirmed small bowel pseudoobstruction.Antiviral therapy,gastrointestinal decompression,and enemas proved unproductive.After 4 d of stagnation,an epidural block was performed for pain relief and prompted the passage of gas and stool,resolving the obstructive problem.Three days later,the rash appeared dry and crusted,and the pain diminished.After 5 d,no abnormality was visible by gastroenteroscopy,and the patient was discharged on day 7.CONCLUSION This case shows that herpes zoster may induce small bowel pseudo-obstruction in addition to colonic pseudo-obstruction.Epidural block can not only treat intercostal neuralgia but also resolve small bowel pseudo-obstruction caused by herpes zoster.
文摘It was not until 1979 that Bayes de Ltma described atrial conduction blocks and classified them as interatrial and intra- atrial.Interatrial blocks refer to conduction disorders lo- cated between the atria, while intraalxial blocks occur within the same atrium. This work motivated several authors, in- cluding Bayes himself, to further investigate atrial conduc- tion and interatrial block （IAB）.
基金the organizations that have funded this project:the Natural Sciences and Engineering Research Council of Canada(Grant No.498020-16)Hydro-Quebec(NC-525700)Mitacs Accelerate Program(Grant Ref.IT10008)
文摘The most commonly used method for assessing the hydraulic erodibility of rock is Annandale's method.This method is based on a correlation between the erosive force of flowing water and the capacity of rock resistance. This capacity is evaluated using Kirsten's index, which was initially developed to evaluate the excavatability of earth materials. For rocky material, this index is determined according to certain geomechanical factors related to intact rock and rock mass, such as compressive strength of intact rock, rock block size, discontinuity shear strength and relative block structure. To quantify the relative block structure, Kirsten(1982) developed a mathematical expression that accounts for the shape and orientation of the blocks relative to the direction of flow. Kirsten's initial concept for assessing the relative block structure considers that the geological formation is mainly fractured by two joint sets forming an orthogonally fractured system. An adjusted concept is proposed to determine the relative block structure when the fractured system is non-orthogonal where the angle between the planes of the two joint sets is greater or less than 90°. An analysis of the proposed relative block structure rating shows that considering a non-orthogonally fractured system has a significant effect on Kirsten's index and, as a consequence, on the assessment of the hydraulic erodibility of rock.
文摘Using pure S wave fitting method, we studied the shear wave velocity structures under the Ordos block and its eastern and southern marginal areas. The results show that the velocity structure beneath Yulin station in the interior of Ordos block is relatively stable, where no apparent change between high and low velocity layers exists and the shear wave velocity increases steadily with the depth. There is a 12km thick layer at the depth of 25km under this station, with an S wave velocity (V S=3.90km/s) lower than that at the same depth in its eastern and southern areas (V S≥4.00km/s). The crust under the eastern margin of Ordos block is thicker than that of the Yulin station, and the velocity structures alternate between the high and low velocity layers, with more low velocity layers. It has the same characteristic as having a 10km-thick low velocity layer (V S=3.80km/s) in the lower crust but buried at a depth of about 35km. Moreover, we studied the V P/V S ratio under each station in combination with the result of P wave velocity inversion. The results show that, the average velocity ratio of the Yulin station at the interior of Ordos block is only 1.68, with a very low ratio (about 1.60) in the upper crust and a stable ratio of about 1.73 in the mid and lower crust, which indicates the media under this station is homogenous and stable, being in a state of rigidity. But at the stations in the eastern and southern margins of the Ordos block, several layers of high velocity ratio (about 1.80) have been found, in which the average velocity ratio under Kelan and Lishi stations at the eastern margin is systemically higher than that of the general elastical body waves (1.732). This reflects that the crust under the marginal areas is more active relatively, and other materials may exist in these layers. Finally, we discussed the relationship among earthquakes, velocity structures beneath stations and faults.
文摘The traditional combinatorial designs can be used as basic designs for constructing designs of computer experiments which have been used successfully till now in various domains such as engineering, pharmaceutical industry, etc. In this paper, a new series of generalized partially balanced incomplete blocks PBIB designs with m associated classes (m = 4, 5 and 7) based on new generalized association schemes with number of treatments v arranged in w arrays of n rows and l columns (w ≥ 2, n ≥ 2, l ≥ 2) is defined. Some construction methods of these new PBIB are given and their parameters are specified using the Combinatory Method (s). For n or l even and s divisor of n or l, the obtained PBIB designs are resolvable PBIB designs. So the Fang RBIBD method is applied to obtain a series of particular U-type designs U (wnl;) (r is the repetition number of each treatment in our resolvable PBIB design).
基金Supported by the National Natural Science Foundation of China(No.41076085)
文摘Pelagic copepods play an important role in the marine food web. However, a full understanding of the ecological status of this zooplankton group depends on the careful study of their natural diets. In previous PCR-based copepod diet studies, we found many apostome ciliates that live symbiotically under the exoskeleton of the copepods, and their sequences were often over-represented in the 18S rRNA gene （18S rDNA） libraries. As a first step to address this issue, we designed three apostome ciliate 18S rDNA blocking primers, and tested their blocking efficiency against apostome ciliate 18S rDNA under various PCR conditions. Using a semi-quantitative PCR method, we optimized the conditions to efficiently amplify the 18S rDNA of the prey while simultaneously excluding the symbiotic apostome ciliates. This technique will facilitate PCR-based diet studies of copepods and other zooplankton in their natural environments.
基金Support for this work was in part from the China University Industry-University Research Innovation Fund Project(No.2022BL052),author B.T,https://www.cutech.edu.cnin part by the Science and Technology InnovationR&DProject of the State GeneralAdministration of Sports of China(No.22KJCX024),author B.T,https://www.sport.gov.cn+1 种基金in part by the Major Project of Philosophy and Social Science Research in Higher Education Institutions in Hubei Province(No.21ZD054),author B.T,https://jyt.hubei.gov.cnKey Project of Hubei Provincial Key Laboratory of Intelligent Transportation Technology and Equipment Open Fund(No.2022XZ106),author B.T,https://hbpu.edu.cn.
文摘In response to the problem of the high cost and low efficiency of traditional water surface litter cleanup through manpower,a lightweight water surface litter detection algorithm based on improved YOLOv5s is proposed to provide core technical support for real-time water surface litter detection by water surface litter cleanup vessels.The method reduces network parameters by introducing the deep separable convolution GhostConv in the lightweight network GhostNet to substitute the ordinary convolution in the original YOLOv5s feature extraction and fusion network;introducing the C3Ghost module to substitute the C3 module in the original backbone and neck networks to further reduce computational effort.Using a Convolutional Block Attention Mechanism(CBAM)module in the backbone network to strengthen the network’s ability to extract significant target features from images.Finally,the loss function is optimized using the Focal-EIoU loss func-tion to improve the convergence speed and model accuracy.The experimental results illustrate that the improved algorithm outperforms the original Yolov5s in all aspects of the homemade water surface litter dataset and has certain advantages over some current mainstream algorithms in terms of model size,detection accuracy,and speed,which can deal with the problems of real-time detection of water surface litter in real life.
文摘BACKGROUND Neuralgia is frequently noted in patients with Kummell’s disease,and its mechanism is complex,rendering it challenging to treat.Percutaneous kyphoplasty(PKP)has been widely used to treat osteoporotic vertebral compression fractures with satisfactory outcomes.However,it is not optimal for managing severely collapsed vertebrae,as cement injection may not be feasible.This report describes the use of a selective nerve block for the treatment of neuralgia caused by severely collapsed vertebrae in a patient with Kummell’s disease.CASE SUMMARY In our patient,three vertebrae were involved.The collapse of T11 was particularly severe.After managing T8 and T9 using PKP,these two segments were effectively strengthened;consequently,back pain was significantly relieved.However,the structure and strength of T11 could not be effectively restored using a minimally invasive surgical method because there was little room for cement injection.This caused obvious neuralgia according to the postoperative status of the PKP.Thus,we performed selective nerve blocks for the treatment of neuralgia,which resulted in satisfactory outcomes.CONCLUSION Selective nerve block may be a possible therapeutic strategy for neuralgia due to severely collapsed vertebrae in Kummell’s disease.
