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信号簇
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     MRI findings of intracranial arteriovenous malformations(AVMs)in 64 patients and cavernous hemangioma in 8 patients were reported and compared with those of CT and cerebral angiog-raphy,Typical sign of signal void at the AVM area was found on MRI.
     报道了64例脑动静脉畸型和8例脑海绵状血管瘤的MRI表现,并对MRI、CT及脑血管造影在脑血管畸形诊断中的应用价值进行了对比分析。 64例脑动静脉畸形的MRI均见到典型征象──流空信号簇
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     Signal transduction of ataxia-telangiectasia
     AT的信号传导
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     New method to realize remote signal measure
     信号遥测方法
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     UWB FOPEN SAR MAN-MADE TARGET SIGNATURE
     UWB叶覆盖SAR人造目标特征信号
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     The Science of Atomic Clusters
     原子团科学
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     The hybridized HBV DNA was distributed in the cytoplasm of the hepatocytes and kupffer's cells in appearance of clusters or diffusion.
     阳性杂交信号均位于肝细胞浆,呈状和弥散状分布。
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  signal cluster
Distal to an RBM signal cluster, a large cluster of DAZ signals is located with only a few DAZ and RBM signals overlapping in between the two clusters.
      
Almost all genes have at least one signal cluster, comprising a minimal average of 4.61 signals.
      
Similarly to the situation for crp1, COVER identifies a 2or 3-signal cluster in E.
      


MRI findings of intracranial arteriovenous malformations(AVMs)in 64 patients and cavernous hemangioma in 8 patients were reported and compared with those of CT and cerebral angiog-raphy,Typical sign of signal void at the AVM area was found on MRI. Twenty-nine cases demon-strated dilated feeding arteries and /or draining veins and in 14 cases enlarged venous sinus was seen. The results indicated that MRI is more sensitive and specific in the detection of intracranial AVM and its complications than CT and provide...

MRI findings of intracranial arteriovenous malformations(AVMs)in 64 patients and cavernous hemangioma in 8 patients were reported and compared with those of CT and cerebral angiog-raphy,Typical sign of signal void at the AVM area was found on MRI. Twenty-nine cases demon-strated dilated feeding arteries and /or draining veins and in 14 cases enlarged venous sinus was seen. The results indicated that MRI is more sensitive and specific in the detection of intracranial AVM and its complications than CT and provide additional informations to cerebral angiography.A combined applica-tion of MRI and CT is very useful in the diagnosis of cavernous hemangioma.

报道了64例脑动静脉畸型和8例脑海绵状血管瘤的MRI表现,并对MRI、CT及脑血管造影在脑血管畸形诊断中的应用价值进行了对比分析。64例脑动静脉畸形的MRI均见到典型征象──流空信号簇。29例见到粗大的供应动脉或/和引流静脉,14例见到扩大的静脉窦。结果表明,MRI对于脑动静脉畸形及其并发症的诊断优于CT,并可弥补脑血管造影的不足。MRI与CT的联合应用对脑海绵状血管瘤的定性诊断很有意义。

Objective To analyze the MRI characteristics of corticosteroid-induced bone infarction in the knee. Methods The MRI appearances of 5 cases of corticosteroid induced bone infarction in the knee were retrospectively analyzed. Results Total 13 bone infarctions were found, 5 were located in the distal femora,4 in the proximal tibia, 1 in lateral condyle of femur, 1 in medial condyle of femur,1 in tibial tuberosity and 1 in patella. MRI showed moderate single line sign in the rim of 3 foci, triple line sign in the...

Objective To analyze the MRI characteristics of corticosteroid-induced bone infarction in the knee. Methods The MRI appearances of 5 cases of corticosteroid induced bone infarction in the knee were retrospectively analyzed. Results Total 13 bone infarctions were found, 5 were located in the distal femora,4 in the proximal tibia, 1 in lateral condyle of femur, 1 in medial condyle of femur,1 in tibial tuberosity and 1 in patella. MRI showed moderate single line sign in the rim of 3 foci, triple line sign in the rim of other 3 foci, and geographic shape in 2 of them. Moderate low signal intensity on T1WI and high signal intensity on T2WI were found in 5 foci, and clusting of a lot of low signal intensity on T1WI and high signal intensity on T2WI were found in 2 foci. Conclusion Corticosteroid induced bone infarction involves multiple sites with characteristic MRI manifestation.

目的探讨激素性骨梗死在膝关节的MRI表现。方法回顾性分析5例因大量应用激素引发膝关节骨梗死的MRI表现。结果5例共发现13个病灶股骨干骺端5个,胫骨干骺端4个,股骨外侧髁1个,股骨内侧髁骨性关节面下1个,胫骨结节1个,髌骨1个。MRI表现3个病灶边缘表现出“单环征”;3个病灶边缘表现出“三环征”,其中2个病灶呈“地图样”;5个病灶呈小灶性长T1长T2信号;2个病灶由多个点状长T1长T2信号簇集而成。结论激素性骨梗死为多发病灶,且MRI表现有特点,MRI检查可以早期诊断。

In light of Ultra-Wideband(UWB) communication's characteristics of ultra-short pulse timing synchronization and cluster of received signals and in accordance with the mean time formula of capturing obtained through the five serial-search algorithms based on Markov model,this paper first presents an analysis of the particular synchronization problem of pulse timing over frame period in UWB communications,then applies Markov chain theory to the process of formula reasoning.The simulation results show that bit...

In light of Ultra-Wideband(UWB) communication's characteristics of ultra-short pulse timing synchronization and cluster of received signals and in accordance with the mean time formula of capturing obtained through the five serial-search algorithms based on Markov model,this paper first presents an analysis of the particular synchronization problem of pulse timing over frame period in UWB communications,then applies Markov chain theory to the process of formula reasoning.The simulation results show that bit reversal search can drastically reduce the mean acquisition time.

针对超宽带(UW B)通信中窄脉冲时位同步的特殊性及其接收脉冲信号的簇特性,根据文献[1]提出的五种基于M arkov链模型的顺序搜索算法所给出的平均捕获时间公式,运用M arkov链理论对给出的各种搜索算法的平均搜索捕获时间的数学公式进行详细的推导,得到正确的平均捕获时间公式,并通过仿真结果验证了比特反转搜索算法所需的平均捕获时间最短。同时对UW B通信特殊的脉冲帧内窄脉冲时位的同步捕获问题进行了阐述。

 
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