In this paper,we study normal families of meromorphic functions.By using the idea in[16],we obtain some normality criteria for families of meromorphic functions concerning the wandering multiple functions,which extend...In this paper,we study normal families of meromorphic functions.By using the idea in[16],we obtain some normality criteria for families of meromorphic functions concerning the wandering multiple functions,which extend and improve the well-known Montel's criterion,Bloch-Valiron's theorem,and the related results due to Carathéodory,and Grahl-Nevo et al..展开更多
In this paper,we obtain a normality criterion for families of meromorphic functions concerning‘wandering’shared functions,which generalizes and improves Montel’s criterion and the related results due to Schwick,Xu-...In this paper,we obtain a normality criterion for families of meromorphic functions concerning‘wandering’shared functions,which generalizes and improves Montel’s criterion and the related results due to Schwick,Xu-Fang,Xu-Qiu,and Grahl-Nevo.Also,a normality relationship between two families is given.展开更多
This experimental study investigated how text difficulty and different working memory capacity(WMC)affected Chinese EFL learners’reading comprehension and their tendency to engage in task-unrelated thoughts,that is,m...This experimental study investigated how text difficulty and different working memory capacity(WMC)affected Chinese EFL learners’reading comprehension and their tendency to engage in task-unrelated thoughts,that is,mind wandering(MW),in the course of reading.Sixty first-year university non-English majors participated in the study.A two-factor mixed experimental design of 2(text difficulty:difficult and simple)×2(WMC:high/large and low/small)was employed.Results revealed that 1)the main and interaction effects of WMC and text difficulty on voluntary MW were significant,whereas those on involuntary MW were not;2)while reading the easy texts,the involuntary MW of high-WMC individuals was less frequent than that of low-WMC ones,whereas while reading the difficult ones,the direct relationship between WMC and involuntary MW was not found;and that 3)high-WMC individuals had a lower overall rate of MW and better reading performance than low-WMC individuals did,but with increasing text difficulty,their rates of overall MW and voluntary MW were getting higher and higher,and the reading performance was getting lower and lower.These results lend support to WM theory and have pedagogical implications for the instruction of L2 reading.展开更多
The reference-frame-independent(RFI)quantum key distribution(QKD)is suitable for satellite-based links by removing the active alignment on the reference frames.However,how the beam wandering influences the performance...The reference-frame-independent(RFI)quantum key distribution(QKD)is suitable for satellite-based links by removing the active alignment on the reference frames.However,how the beam wandering influences the performance of RFI-QKD remains a pending issue in satellite-to-ground links.In this paper,based on the mathematical model for characterizing beam wandering,we present the security analysis for satellite-to-ground RFI-QKD and analytically derive formulas for calculating the secret key rate with beam wandering.Our simulation results show that the performance of RFI-QKD is better than the Bennett–Brassard 1984(BB84)QKD with beam wandering in asymptotic case.Furthermore,the degree of influences of beam wandering is specifically presented for satellite-to-ground RFI-QKD when statistical fluctuations are taken into account.Our work can provide theoretical support for the realization of RFI-QKD using satellite-to-ground links and have implications for the construction of large-scale satellite-based quantum networks.展开更多
In this paper, we mainly investigate entire solutions of complex differential equations with coefficients involving exponential functions, and obtain the dynamical properties of the solutions, their derivatives and pr...In this paper, we mainly investigate entire solutions of complex differential equations with coefficients involving exponential functions, and obtain the dynamical properties of the solutions, their derivatives and primitives. With some conditions on coefficients, for the solutions, their derivatives and their primitives, we consider the common limiting directions of Julia set and the existence of Baker wandering domain.展开更多
Mid-Cretaceous strata within the Tintina Trench, 3 km west of the community of Ross River, contain evidence of deposition in two distinct, alternating, fluvial settings. Coal-bearing, mud-dominated strata are commonly...Mid-Cretaceous strata within the Tintina Trench, 3 km west of the community of Ross River, contain evidence of deposition in two distinct, alternating, fluvial settings. Coal-bearing, mud-dominated strata are commonly associated with high-constructive sandy channel systems, with extensive overbank, levee and splay deposits. Channels are between 3 and 30 m wide and 0.4-7 m thick. They show repetitive development of side and in-channel bar-forms, as well as up-channel widening of the rivers by selective erosion of associated overbank and levee deposits. Levees extended for several hundred metres away from the channels. In this setting low-angle inclined stratification and epsilon cross stratification may reflect lateral migration of crevasse channels or small streams. The paucity of exposure prevents recognition of the channels as products of multiple channel anastomosed systems or single channel high-constructive systems. Gravel-dominated strata, inter-bedded with, and overlying coal-bearing units, are interpreted as deposits of wandering gravel-bed rivers, with sinuosity approaching 1.4. In most exposures they appear to be dominated by massive and thin planar-bedded granule to small pebble conglomerates, which would traditionally be interpreted as sheet-flood or longitudinal bar deposits of a high-gradient braided stream or alluvial fan. Architectural analysis of exposures in an open-pit shows that the predominance of flat bedding is an artefact of the geometry of the roadside exposures. In the pit the conglomerates are dominated by large scale cross stratification on a scale of 1-5.5 m. These appear to have developed as downstream and lateral accretion elements on side-bars and on in-channel bars in water depths of 2-12 m. Stacking of strata on domed 3rd order surfaces suggests development of longitudinal in-channel bar complexes similar to those observed in parts of the modern Rhone River system. Mudstone preserved in some of the channels reflects intervals of channel abandonment or avulsion. Minimum channel width is from 70 to 450 m.展开更多
BACKGROUND Axenfeld-Rieger syndrome(ARS)is an autosomal dominant genetic disease characterized by ocular developmental disorders and its association with torsion of wandering spleen(WS)has not been reported to date to...BACKGROUND Axenfeld-Rieger syndrome(ARS)is an autosomal dominant genetic disease characterized by ocular developmental disorders and its association with torsion of wandering spleen(WS)has not been reported to date to the best of our knowledge.This study aimed to describe a rare case of ARS observed at our emergency department.CASE SUMMARY A 25-year-old female presented with a constant lower abdominal pain of increasing severity.Diagnostic computed tomography with intravenous contrast material showed a non-homogenously enhanced splenic parenchyma with a twisted vascular pedicle.Further,an emergent laparoscopic exploration was performed,and an ischemic spleen without its normal ligamentous attachments was noted.Notably,the spleen did not regain its normal vascularity after detorsion;thus,we performed the laparoscopic total splenectomy.The postoperative course was uneventful,and the patient was discharged on the 5th postoperative day.This case demonstrates a rare association of WS and ARS.CONCLUSION Early diagnosis of WS in the emergency department is important to prevent pedicle torsion or splenic necrosis and to avoid splenectomy.展开更多
As an important romantic poet,William Wordsworth produced large numbers of poems known for refined rhymes,images and thoughts,which are exemplified by Song for the Wandering Jew.This paper analyzes this poem by a styl...As an important romantic poet,William Wordsworth produced large numbers of poems known for refined rhymes,images and thoughts,which are exemplified by Song for the Wandering Jew.This paper analyzes this poem by a stylistic approach which shows how sounds,images and syntax artistically made contribution to the poetic quality.展开更多
Shen Congwen and Thomas Hardy are both known for their regional novels,Hardy for his "Wessex" novels,and Shen Congwen for his "World of Xiangxi" .Both writers display a sense of transcendence and w...Shen Congwen and Thomas Hardy are both known for their regional novels,Hardy for his "Wessex" novels,and Shen Congwen for his "World of Xiangxi" .Both writers display a sense of transcendence and wandering in their female characters.Both Xiao Xiao in Shen Congwen' s Xiao Xiao and Eustacia in Hardy' s The Return of the Native transcend the traditions and customs of their times,and experience a consequent wandering.But the ways of the two writers in presenting their heroines is quite different.While Xiao Xiao was mentally active but did nothing except follow the traditional system,Eustacia' s thought was followed by her own words and actions.展开更多
Space syntax has proven there appears to be a fundamental process that informs human and social usage of an environ- ment, and the effects of spatial configuration on movement patterns are consistent with a model of i...Space syntax has proven there appears to be a fundamental process that informs human and social usage of an environ- ment, and the effects of spatial configuration on movement patterns are consistent with a model of individual decision behavior. In- troducing space syntax to crowd simulation will enable space structure guide the random movement of the crowd with no specific targets. This paper proposes a simulation method of the wandering crowd, which calculates the crowd distribution corresponding to the space through space syntax and uses a hybrid path planning algorithm to dynamically navigate the crowd to conform to the dis- tribution. Experiments show the presented method can obtain reasonable and vision-realistic simulation results.展开更多
In this paper, we show that for log(2/3)/2log2≤ β ≤1/2, suppose S is an invariant subspace of the Hardy-Sobolev spaces H_β~2(D^n) for the n-tuple of multiplication operators(M_(z_1),...,M_(z_n)). If(M_(z_1)|S,...,...In this paper, we show that for log(2/3)/2log2≤ β ≤1/2, suppose S is an invariant subspace of the Hardy-Sobolev spaces H_β~2(D^n) for the n-tuple of multiplication operators(M_(z_1),...,M_(z_n)). If(M_(z_1)|S,..., M_(z_n)|S) is doubly commuting, then for any non-empty subset α = {α_1,..., α_k} of {1,..., n}, W_α~S is a generating wandering subspace for M_α|_S =(M_(z_(α_1))|_S,..., M_(z_(α_k))|_S), that is, [W_α~S]_(M_(α |S))= S, where W_α~S=■(S ■ z_(α_i)S).展开更多
The default mode network(DMN) is associated with the occurrence of mind-wandering or task-unrelated thought. In contrast, the frontal-parietal network(FPN) and visual network(VS) are involved in tasks with external st...The default mode network(DMN) is associated with the occurrence of mind-wandering or task-unrelated thought. In contrast, the frontal-parietal network(FPN) and visual network(VS) are involved in tasks with external stimuli. However, it is not clear how these functional network interactions support these two different processes– mind-wandering and on-task – especially with regard to individual variation in the mind-wandering experience. In this study, we investigated the functional connectivity and modular structure among the DMN, FPN, and VS. Our results showed that, compared to the on-task period, mindwandering was associated with increased DMN activity and increased DMN-VS connectivity. Moreover, mindwandering was accompanied by a large number of transitional nodes, which expressed a diversity of brain regions. Intriguingly, the functional connectivity of the FPN and VS was strongly correlated with individual behavioral performance. Our findings highlight the individual variation of mind-wandering, which implies the importance of other complementary large-scale brain networks.展开更多
Based on the kinematic relationship of the drill, drill point and workpiece and the coordinate systems founded,the mathematical models of the drill point wandering motion for the drill initial penetration, i. e. the f...Based on the kinematic relationship of the drill, drill point and workpiece and the coordinate systems founded,the mathematical models of the drill point wandering motion for the drill initial penetration, i. e. the formulae for the drill point center locus, hole shape and cutting edge locus, are established. According to these formulae the hole shape to be made is simulated and analyzed. It is verified that the bending chatter of the drill during the drill penetrating is the main cause to form a polygon like hole.展开更多
BACKGROUND The occurrence of gastrointestinal stromal tumors(GISTs)in the small intestine is rare,and a case of wandering small intestinal stromal tumor has been rarely reported to date.Dissemination of this case can ...BACKGROUND The occurrence of gastrointestinal stromal tumors(GISTs)in the small intestine is rare,and a case of wandering small intestinal stromal tumor has been rarely reported to date.Dissemination of this case can help inform future diagnosis and effective treatment.CASE SUMMARY A 68-year-old patient presented to us with tarry stools.Computed tomography showed a mobile tumor moving widely within the abdominal cavity.As the laboratory data showed a low range of red blood cells and an immediate surgery was not indicated,we performed digital subtraction angiography and embolization to achieve hemostasis.Surgical resection was performed after the patient’s condition improved.The tumor was successfully removed laparoscopically.Histological examination revealed submucosal GIST with infarction,which was of intermediate-risk,with mitotic count<1 per 10 high-power field.Immunohistochemical studies revealed the following:CD117+,Dog1+,CD34+,SMA+,S100-,CK-,Des-,SOX-11-,STAT6-,Ki67 Hotspots 10%+.The patient was ultimately diagnosed with wandering small intestinal stromal tumor.CONCLUSION When a highly vascularized tumor is clinically encountered in the small intestine,the possibility of stromal tumors should be considered.However,when the tumor cannot be visualized at its original location,the possibility of tumor migration is considered.展开更多
For elders with dementia, wandering is among the most problematic, frequent and dangerous behavior. Managing wandering behavior has become increasingly imperative due to its high prevalence, negative outcomes and burd...For elders with dementia, wandering is among the most problematic, frequent and dangerous behavior. Managing wandering behavior has become increasingly imperative due to its high prevalence, negative outcomes and burden on caregivers. We study to propose an active infrared-based method to identify wandering locomotion by monitoring rhythmical repetition of an elder’s indoor motion events. Specifically, we utilize our customized active infrared sensors to collect human indoor motions that will be converted into motion events by using hardware redundancy technique. Each motion event is a directed motion obtained via introducing temporal and dimensions into the spatial motion data. Based on the most cited spatial-temporal patterns of wandering locomotion, a spatiotemporal model is then proposed to identify wandering locomotion from an ongoing sequence of motion events. Experimental evaluation on eight individuals’ real-world motion datasets has shown that our proposed method is able to effectively identify wandering locomotion from repetitive events collected from active infrared sensors with a value over 98% for both accuracy and precision based on properly chosen parameters. Wandering in elders with dementia that follow specific spatiotemporal patterns can be reliably identified by analyzing repetitive motion events collected from active infrared sensors based on the well-known spatiotemporal patterns of wandering locomotion.展开更多
BACKGROUND Wandering spleen is rare clinically.It is characterized by displacement of the spleen in the abdominal and pelvic cavities and can have congenital or acquired causes.Wandering spleen involves serious compli...BACKGROUND Wandering spleen is rare clinically.It is characterized by displacement of the spleen in the abdominal and pelvic cavities and can have congenital or acquired causes.Wandering spleen involves serious complications,such as spleen torsion.The clinical symptoms range from asymptomatic abdominal mass to acute abdominal pain.Surgery is required after diagnosis.Cases of wandering spleen torsion with portal vein thrombosis(PVT)are rare.There is no report on how to eliminate PVT in such cases.CASE SUMMARY Ultrasound and computed tomography revealed a diagnosis of wandering spleen torsion with PVT in a 31-year-old woman with a history of childbirth 16 mo previously who received emergency treatment for upper abdominal pain.She recovered well after splenectomy and portal vein thrombectomy combined with continuous anticoagulation,and the PVT disappeared.CONCLUSION Rare and nonspecific conditions,such as wandering splenic torsion with PVT,must be diagnosed and treated early.Patients with complete splenic infarction require splenectomy.Anticoagulation therapy and individualized management for PVT is feasible.展开更多
Wandering or ectopic spleen is a rare congenital or acquired abnormality due to a defect in the anatomical fixity of the spleen with the surrounding organs. Pedicle twisting is its most common complication. It is an a...Wandering or ectopic spleen is a rare congenital or acquired abnormality due to a defect in the anatomical fixity of the spleen with the surrounding organs. Pedicle twisting is its most common complication. It is an anatomo-clinical entity most often described in children, but rare in adults. It is a serious condition, especially when it occurs on a pregnancy putting at stake maternal and fetal prognosis. Authors report a case of acute volvulus of wandering spleen in a 26-year-old patient admitted for abdominal pain on an active pregnancy of 15 weeks of amenorrhea. Abdominal ultrasound scan helped to set the diagnosis. At laparotomy, the enlarged spleen was in an ectopic position, in the iliac fossa with a pedicle abnormally twisted in several spiral turns. Splenectomy was performed. The post-operative period was simple and the pregnancy progressed well to term.展开更多
Objective:The main objective of this project was to studyhow to secure the wandering of elderly persons diagnosed with dementia caused by Alzheimer’s disease by using healthcare technologies. Methods:The study was ca...Objective:The main objective of this project was to studyhow to secure the wandering of elderly persons diagnosed with dementia caused by Alzheimer’s disease by using healthcare technologies. Methods:The study was carried out during a three-year period (2008-2011) in the region of South Ostrobothnia, Finland. Thirty-two elderly persons living at home and diagnosed with Alzheimer’s disease participated in the study. The ages of the intervention group ranged from 66 to 90 years;the average age was 81 years. A total of 63 different home care devices including 24 location based technologies were tested during the intervention.The choice of technology used was based on the individual needs of the elderly person. Results:Participants with mild stage memory impairment were able to use and benefit from the technology installed during the intervention to live more independently.The most useful devices were those that operated within the home. Nine of ten users of door alarm systems, five of nine users of GPS systems and all users of GSM systems were satisfied with the technologies. Conclusions:Location based alarm and access control technology can have a positive impact on the lives of elderly persons suffering from dementia. When chosen appropriately, technology can help to reduce or eliminate the wandering often associated with dementia.Regardless of the technology used, it should be installed when the elderly person is at the early stages of dementia;at later stages of the disease it is usually impossible for the elderly to adequately adopt the device.展开更多
文摘In this paper,we study normal families of meromorphic functions.By using the idea in[16],we obtain some normality criteria for families of meromorphic functions concerning the wandering multiple functions,which extend and improve the well-known Montel's criterion,Bloch-Valiron's theorem,and the related results due to Carathéodory,and Grahl-Nevo et al..
基金Supported by the National Natural Science Foundation of China(Grant No.11471163)。
文摘In this paper,we obtain a normality criterion for families of meromorphic functions concerning‘wandering’shared functions,which generalizes and improves Montel’s criterion and the related results due to Schwick,Xu-Fang,Xu-Qiu,and Grahl-Nevo.Also,a normality relationship between two families is given.
文摘This experimental study investigated how text difficulty and different working memory capacity(WMC)affected Chinese EFL learners’reading comprehension and their tendency to engage in task-unrelated thoughts,that is,mind wandering(MW),in the course of reading.Sixty first-year university non-English majors participated in the study.A two-factor mixed experimental design of 2(text difficulty:difficult and simple)×2(WMC:high/large and low/small)was employed.Results revealed that 1)the main and interaction effects of WMC and text difficulty on voluntary MW were significant,whereas those on involuntary MW were not;2)while reading the easy texts,the involuntary MW of high-WMC individuals was less frequent than that of low-WMC ones,whereas while reading the difficult ones,the direct relationship between WMC and involuntary MW was not found;and that 3)high-WMC individuals had a lower overall rate of MW and better reading performance than low-WMC individuals did,but with increasing text difficulty,their rates of overall MW and voluntary MW were getting higher and higher,and the reading performance was getting lower and lower.These results lend support to WM theory and have pedagogical implications for the instruction of L2 reading.
基金Project supported by the National Natural Science Foundation of China (Grant Nos.61505261,62101597,61605248,and 61675235)the National Key Research and Development Program of China (Grant No.2020YFA0309702)+2 种基金the China Postdoctoral Science Foundation (Grant No.2021M691536)the Natural Science Foundation of Henan Province,China (Grant Nos.202300410534 and 202300410532)the Fund of the Anhui Initiative in Quantum Information Technologies。
文摘The reference-frame-independent(RFI)quantum key distribution(QKD)is suitable for satellite-based links by removing the active alignment on the reference frames.However,how the beam wandering influences the performance of RFI-QKD remains a pending issue in satellite-to-ground links.In this paper,based on the mathematical model for characterizing beam wandering,we present the security analysis for satellite-to-ground RFI-QKD and analytically derive formulas for calculating the secret key rate with beam wandering.Our simulation results show that the performance of RFI-QKD is better than the Bennett–Brassard 1984(BB84)QKD with beam wandering in asymptotic case.Furthermore,the degree of influences of beam wandering is specifically presented for satellite-to-ground RFI-QKD when statistical fluctuations are taken into account.Our work can provide theoretical support for the realization of RFI-QKD using satellite-to-ground links and have implications for the construction of large-scale satellite-based quantum networks.
基金supported by Shanghai Center for Mathematical Science China Scholarship Council(201206105015)the National Science Foundation of China(11171119,11001057,11571049)the Natural Science Foundation of Guangdong Province in China(2014A030313422)
文摘In this paper, we mainly investigate entire solutions of complex differential equations with coefficients involving exponential functions, and obtain the dynamical properties of the solutions, their derivatives and primitives. With some conditions on coefficients, for the solutions, their derivatives and their primitives, we consider the common limiting directions of Julia set and the existence of Baker wandering domain.
基金NSERC,Lithoprobe(Snorcle) and the Government of the Yukon for providing support for this research
文摘Mid-Cretaceous strata within the Tintina Trench, 3 km west of the community of Ross River, contain evidence of deposition in two distinct, alternating, fluvial settings. Coal-bearing, mud-dominated strata are commonly associated with high-constructive sandy channel systems, with extensive overbank, levee and splay deposits. Channels are between 3 and 30 m wide and 0.4-7 m thick. They show repetitive development of side and in-channel bar-forms, as well as up-channel widening of the rivers by selective erosion of associated overbank and levee deposits. Levees extended for several hundred metres away from the channels. In this setting low-angle inclined stratification and epsilon cross stratification may reflect lateral migration of crevasse channels or small streams. The paucity of exposure prevents recognition of the channels as products of multiple channel anastomosed systems or single channel high-constructive systems. Gravel-dominated strata, inter-bedded with, and overlying coal-bearing units, are interpreted as deposits of wandering gravel-bed rivers, with sinuosity approaching 1.4. In most exposures they appear to be dominated by massive and thin planar-bedded granule to small pebble conglomerates, which would traditionally be interpreted as sheet-flood or longitudinal bar deposits of a high-gradient braided stream or alluvial fan. Architectural analysis of exposures in an open-pit shows that the predominance of flat bedding is an artefact of the geometry of the roadside exposures. In the pit the conglomerates are dominated by large scale cross stratification on a scale of 1-5.5 m. These appear to have developed as downstream and lateral accretion elements on side-bars and on in-channel bars in water depths of 2-12 m. Stacking of strata on domed 3rd order surfaces suggests development of longitudinal in-channel bar complexes similar to those observed in parts of the modern Rhone River system. Mudstone preserved in some of the channels reflects intervals of channel abandonment or avulsion. Minimum channel width is from 70 to 450 m.
文摘BACKGROUND Axenfeld-Rieger syndrome(ARS)is an autosomal dominant genetic disease characterized by ocular developmental disorders and its association with torsion of wandering spleen(WS)has not been reported to date to the best of our knowledge.This study aimed to describe a rare case of ARS observed at our emergency department.CASE SUMMARY A 25-year-old female presented with a constant lower abdominal pain of increasing severity.Diagnostic computed tomography with intravenous contrast material showed a non-homogenously enhanced splenic parenchyma with a twisted vascular pedicle.Further,an emergent laparoscopic exploration was performed,and an ischemic spleen without its normal ligamentous attachments was noted.Notably,the spleen did not regain its normal vascularity after detorsion;thus,we performed the laparoscopic total splenectomy.The postoperative course was uneventful,and the patient was discharged on the 5th postoperative day.This case demonstrates a rare association of WS and ARS.CONCLUSION Early diagnosis of WS in the emergency department is important to prevent pedicle torsion or splenic necrosis and to avoid splenectomy.
文摘As an important romantic poet,William Wordsworth produced large numbers of poems known for refined rhymes,images and thoughts,which are exemplified by Song for the Wandering Jew.This paper analyzes this poem by a stylistic approach which shows how sounds,images and syntax artistically made contribution to the poetic quality.
文摘Shen Congwen and Thomas Hardy are both known for their regional novels,Hardy for his "Wessex" novels,and Shen Congwen for his "World of Xiangxi" .Both writers display a sense of transcendence and wandering in their female characters.Both Xiao Xiao in Shen Congwen' s Xiao Xiao and Eustacia in Hardy' s The Return of the Native transcend the traditions and customs of their times,and experience a consequent wandering.But the ways of the two writers in presenting their heroines is quite different.While Xiao Xiao was mentally active but did nothing except follow the traditional system,Eustacia' s thought was followed by her own words and actions.
基金Anhui National Science Foundation(No.1208085MF107)the Fundamental Research Funds for the Central Universities(No.2012HGZY0017)
文摘Space syntax has proven there appears to be a fundamental process that informs human and social usage of an environ- ment, and the effects of spatial configuration on movement patterns are consistent with a model of individual decision behavior. In- troducing space syntax to crowd simulation will enable space structure guide the random movement of the crowd with no specific targets. This paper proposes a simulation method of the wandering crowd, which calculates the crowd distribution corresponding to the space through space syntax and uses a hybrid path planning algorithm to dynamically navigate the crowd to conform to the dis- tribution. Experiments show the presented method can obtain reasonable and vision-realistic simulation results.
基金supported by the Natural Science Foundation of China(11271092,11471143)the key research project of Nanhu College of Jiaxing University(N41472001-18)
文摘In this paper, we show that for log(2/3)/2log2≤ β ≤1/2, suppose S is an invariant subspace of the Hardy-Sobolev spaces H_β~2(D^n) for the n-tuple of multiplication operators(M_(z_1),...,M_(z_n)). If(M_(z_1)|S,..., M_(z_n)|S) is doubly commuting, then for any non-empty subset α = {α_1,..., α_k} of {1,..., n}, W_α~S is a generating wandering subspace for M_α|_S =(M_(z_(α_1))|_S,..., M_(z_(α_k))|_S), that is, [W_α~S]_(M_(α |S))= S, where W_α~S=■(S ■ z_(α_i)S).
基金supported by grants from the National Natural Science Foundation of China (31571111)the Chongqing Research Program of Basic Research and Frontier Technology (cstc2017jcyjAX0110)the Fundamental Research Funds for the Central Universities (SWU1609109)
文摘The default mode network(DMN) is associated with the occurrence of mind-wandering or task-unrelated thought. In contrast, the frontal-parietal network(FPN) and visual network(VS) are involved in tasks with external stimuli. However, it is not clear how these functional network interactions support these two different processes– mind-wandering and on-task – especially with regard to individual variation in the mind-wandering experience. In this study, we investigated the functional connectivity and modular structure among the DMN, FPN, and VS. Our results showed that, compared to the on-task period, mindwandering was associated with increased DMN activity and increased DMN-VS connectivity. Moreover, mindwandering was accompanied by a large number of transitional nodes, which expressed a diversity of brain regions. Intriguingly, the functional connectivity of the FPN and VS was strongly correlated with individual behavioral performance. Our findings highlight the individual variation of mind-wandering, which implies the importance of other complementary large-scale brain networks.
文摘Based on the kinematic relationship of the drill, drill point and workpiece and the coordinate systems founded,the mathematical models of the drill point wandering motion for the drill initial penetration, i. e. the formulae for the drill point center locus, hole shape and cutting edge locus, are established. According to these formulae the hole shape to be made is simulated and analyzed. It is verified that the bending chatter of the drill during the drill penetrating is the main cause to form a polygon like hole.
文摘BACKGROUND The occurrence of gastrointestinal stromal tumors(GISTs)in the small intestine is rare,and a case of wandering small intestinal stromal tumor has been rarely reported to date.Dissemination of this case can help inform future diagnosis and effective treatment.CASE SUMMARY A 68-year-old patient presented to us with tarry stools.Computed tomography showed a mobile tumor moving widely within the abdominal cavity.As the laboratory data showed a low range of red blood cells and an immediate surgery was not indicated,we performed digital subtraction angiography and embolization to achieve hemostasis.Surgical resection was performed after the patient’s condition improved.The tumor was successfully removed laparoscopically.Histological examination revealed submucosal GIST with infarction,which was of intermediate-risk,with mitotic count<1 per 10 high-power field.Immunohistochemical studies revealed the following:CD117+,Dog1+,CD34+,SMA+,S100-,CK-,Des-,SOX-11-,STAT6-,Ki67 Hotspots 10%+.The patient was ultimately diagnosed with wandering small intestinal stromal tumor.CONCLUSION When a highly vascularized tumor is clinically encountered in the small intestine,the possibility of stromal tumors should be considered.However,when the tumor cannot be visualized at its original location,the possibility of tumor migration is considered.
文摘For elders with dementia, wandering is among the most problematic, frequent and dangerous behavior. Managing wandering behavior has become increasingly imperative due to its high prevalence, negative outcomes and burden on caregivers. We study to propose an active infrared-based method to identify wandering locomotion by monitoring rhythmical repetition of an elder’s indoor motion events. Specifically, we utilize our customized active infrared sensors to collect human indoor motions that will be converted into motion events by using hardware redundancy technique. Each motion event is a directed motion obtained via introducing temporal and dimensions into the spatial motion data. Based on the most cited spatial-temporal patterns of wandering locomotion, a spatiotemporal model is then proposed to identify wandering locomotion from an ongoing sequence of motion events. Experimental evaluation on eight individuals’ real-world motion datasets has shown that our proposed method is able to effectively identify wandering locomotion from repetitive events collected from active infrared sensors with a value over 98% for both accuracy and precision based on properly chosen parameters. Wandering in elders with dementia that follow specific spatiotemporal patterns can be reliably identified by analyzing repetitive motion events collected from active infrared sensors based on the well-known spatiotemporal patterns of wandering locomotion.
基金Supported by CACMS Innovation Fund,No.CI2021A03317.
文摘BACKGROUND Wandering spleen is rare clinically.It is characterized by displacement of the spleen in the abdominal and pelvic cavities and can have congenital or acquired causes.Wandering spleen involves serious complications,such as spleen torsion.The clinical symptoms range from asymptomatic abdominal mass to acute abdominal pain.Surgery is required after diagnosis.Cases of wandering spleen torsion with portal vein thrombosis(PVT)are rare.There is no report on how to eliminate PVT in such cases.CASE SUMMARY Ultrasound and computed tomography revealed a diagnosis of wandering spleen torsion with PVT in a 31-year-old woman with a history of childbirth 16 mo previously who received emergency treatment for upper abdominal pain.She recovered well after splenectomy and portal vein thrombectomy combined with continuous anticoagulation,and the PVT disappeared.CONCLUSION Rare and nonspecific conditions,such as wandering splenic torsion with PVT,must be diagnosed and treated early.Patients with complete splenic infarction require splenectomy.Anticoagulation therapy and individualized management for PVT is feasible.
文摘Wandering or ectopic spleen is a rare congenital or acquired abnormality due to a defect in the anatomical fixity of the spleen with the surrounding organs. Pedicle twisting is its most common complication. It is an anatomo-clinical entity most often described in children, but rare in adults. It is a serious condition, especially when it occurs on a pregnancy putting at stake maternal and fetal prognosis. Authors report a case of acute volvulus of wandering spleen in a 26-year-old patient admitted for abdominal pain on an active pregnancy of 15 weeks of amenorrhea. Abdominal ultrasound scan helped to set the diagnosis. At laparotomy, the enlarged spleen was in an ectopic position, in the iliac fossa with a pedicle abnormally twisted in several spiral turns. Splenectomy was performed. The post-operative period was simple and the pregnancy progressed well to term.
基金supported by the European Union(EU)European Social Fund(ESF)fund as part of the“Kulku-rin Valssi”Project.
文摘Objective:The main objective of this project was to studyhow to secure the wandering of elderly persons diagnosed with dementia caused by Alzheimer’s disease by using healthcare technologies. Methods:The study was carried out during a three-year period (2008-2011) in the region of South Ostrobothnia, Finland. Thirty-two elderly persons living at home and diagnosed with Alzheimer’s disease participated in the study. The ages of the intervention group ranged from 66 to 90 years;the average age was 81 years. A total of 63 different home care devices including 24 location based technologies were tested during the intervention.The choice of technology used was based on the individual needs of the elderly person. Results:Participants with mild stage memory impairment were able to use and benefit from the technology installed during the intervention to live more independently.The most useful devices were those that operated within the home. Nine of ten users of door alarm systems, five of nine users of GPS systems and all users of GSM systems were satisfied with the technologies. Conclusions:Location based alarm and access control technology can have a positive impact on the lives of elderly persons suffering from dementia. When chosen appropriately, technology can help to reduce or eliminate the wandering often associated with dementia.Regardless of the technology used, it should be installed when the elderly person is at the early stages of dementia;at later stages of the disease it is usually impossible for the elderly to adequately adopt the device.
