The settlement characteristic of underground urban complex in Shanghai

The effects of excavation unloading, construction reloading and underground water on basal heave of excavation projects were presented and analyzed based on the measurement results of an underground urban complex which was located in Shanghai. The effects on water pressure and building settlements were analyzed as well. The numerical analyses by finite element method (FEM) were conducted. It showed that the soil under the excavation base continued to heave during the following certain construction stage. It also found that the bearing capacity of uplift piles which supported the buildings affected the structure quality significantly. The conclusions can be applied in future projects. Foundation item: the National Natural Science Foundation of China (No. 50679041)     

Magnetic resonance imaging of atherosclerotic lesion with new devised animal surface coil

The ability of dynamic contrast enhanced magnetic resonance imaging(DCE MRI) with a new devised animal surface coil was analyzed in identifying atherosclerotic plaques in the rabbit medium-sized iliac artery(IA).Then a comparative analysis of multi-detector computed tomography(MDCT) and DCE MRI was done in discerning morphology and components of 80 atherosclerotic plaques identified by histopathology.It shows that the DCE MRI may be an emerging noninvasive and economic way to characterize atherosclerotic plaques at present.What's more, a new devised animal surface coil would further improve the signal-to-noise ratio(SNR) and the quality of imaging.However, CT angiography(CTA) may be better than MR angiography(MRA) in detecting vessel stenosis.     

基于瞬变电磁雷达的检测技术及其在隧道衬砌中的应用

基于自主研发的瞬变电磁雷达技术对铁路隧道衬砌质量进行检测,结合双极性叠加法与小波去噪法对采集信号作去噪处理,利用欠阻尼探测天线,得到隧道衬砌各部位缺陷特征;结合地质雷达（GPR）检测和现场钻孔数据,通过典型图像分析,对比瞬变电磁雷达在探测深度、图像分辨率方面与地质雷达的差异,总结其相对于普通衬砌检测雷达所具有的优势。综合分析表明,瞬变电磁雷达应用于衬砌检测具有如下特性：（1）探测深度较大,穿透性较强;（2）图像分辨率较高,电磁波反射具有体积效应,成像直观清晰;（3）操作更便捷,雷达主机与采集终端为无线数据传输且设备轻便,可单人操作,数据可现场处理,从而可快速实时查看隧道衬砌缺陷,并标定衬砌缺陷部位便于后续处理。     

CVEM排放模型在综合交通规划中的应用——以成渝城市群为例

为满足交通规划对环境影响评价中交通排放的定量评估要求,分析了交通规划阶段对交通排放模型的需求。根据对交通排放测算模型和其与交通规划模型的对接研究,设计了中国机动车排放模型（China Vehicle Emission Model, CVEM） 在交通规划环境评价中的应用方法,从模型结构和参数设置、排放因子修正和与交通规划模型对接方法三方面展开。其中,对接方法根据交通规划模型输出结果为交通量或周转量分开进行设计。最后,以成渝城市群综合交通规划为例,应用CVEM排放模型对规划方案进行交通排放评估。结果显示：CVEM排放模型能够反映成渝城市群不同规划方案的排放评估差异。污染物排放总量随着方案中公路运输周转量占比的降低而降低。利用交通排放的空间分布,可以分线路、分客货运测算污染物排放,从而能进一步结合规划方案开展交通策略研究。     

饮用水中过量氟对儿童唾液蛋白表达的影响

目的　观察分别来自饮用水氟浓度为 3.6 8mg·L-1和 1.0 0mg·L-1两地区儿童间的刺激性颌 /舌下腺唾液中唾液蛋白是否存在差异。方法　测定受试对象的刺激性颌 /舌下腺唾液的唾液流率、唾液总蛋白浓度和单位时间唾液总蛋白的分泌量 ,分析唾液蛋白组成及各组分占总量的比例。结果　①F3 .68组颌 /舌下腺唾液流率高于F1.0 0组 (P <0 .1) ;②F3 .68组颌 /舌下腺唾液总蛋白浓度明显低于F1.0 0 组 (P <0 .0 1) ;③F3 .68组颌 /舌下腺单位时间唾液总蛋白的分泌量显著低于F1.0 0 组 (P <0 .0 5 ) ;④在十二烷基硫酸钠 聚丙烯酰胺凝胶电泳 (SDS PAGE)不连续电泳条件下发现 ,两组颌 /舌下腺唾液共发现 10～ 12条蛋白带 ,其中B10 、B12 蛋白带的出现率在F3 .68组显著低于F1.0 0 组(P <0 .0 5 ) ,且B9蛋白带的量占总蛋白量的比例在F3 .68组显著高于F1.0 0 组 (P <0 .0 1)。结论　两组刺激性颌 /舌下腺唾液中有关唾液蛋白的指标存在量的差异 ,提示饮用水中过量氟对儿童唾液蛋白表达有影响     

A bintree energy approach for colour image segmentation using adaptive channel selection

A new hierarchical approach called bintree energy segmentation was presented for color image segmentation. The image features are extracted by adaptive clustering on multi-channel data at each level and used as the criteria to dynamically select the best chromatic channel, where the segmentation is carried out. In this approach, an extended direct energy computation method based on the Chan-Vese model was proposed to segment the selected channel, and the segmentation outputs are then fused with other channels into new images, from which a new channel with better features is selected for the second round segmentation. This procedure is repeated until the preset condition is met. Finally, a binary segmentation tree is formed, in which each leaf represents a class of objects with a distinctive color. To facilitate the data organization, image background is employed in segmentation and channels fusion. The bintree energy segmentation exploits color information involved in all channels data and tries to optimize the global segmentation result by choosing the ＂best＂ channel for segmentation at each level. The experiments show that the method is effective in speed, accuracy and flexibility.     

MR IMAGING OF THE PANCREAS

Objective To evaluate the ability of showing the pancreatic diseases on various MRI sequences. Methods Eighty-four subjects included 50 normal individuals and 34 patients(22 patients investigated for pancreatic neoplasia and 12 pancreatitis) were presented. The MR protocol included conventional SE T1WI, FSE T2WI, Pre-and post-contrast T1-weighted fat-suppressed and GRE imaging. Results The best diagnostic information was provided by T1-weighted fatsuppressed imaging before and after gadolinium enhancement on 27 of 34 cases with abnormal pan creas, followed by immediately postcontrast GRE images. Precontrast GRE imaging better showed the features of a cute pancreatitis. FSE T2WI obviously exhibited islet cell tumor and metastases of liver from pancreatic adenocarcino ma. Conclusion The standard MR protocol included T1-weighted fat-suppressed image and dynamic GRE imaging.     

A rate-distortion based quantization level adjustment algorithm in block-based video compression

In this paper, a rate-distortion based quantization level adjustment (RDQLA) algorithm is presented. Based on the rate-distortion criterion, the quantization level adjustment algorithm effectively improves coding efficiency by adaptively optimizing quantization levels of the signals near the boundaries of quantization cells and adjusting quantization levels per block. In addition, it has no overhead and is fully compatible with the existing compression standards. The proposed algorithm can be applied in any block based image and video coding method. In particular, the algorithm has been verified on the platform of H.264. Experimental results show that the proposed algorithm improves objective and subjective performances substantially. It is shown that the proposed algorithm has a gain of several dB comparing with the newest H.264 standard for high bit rates. Foundation item: the Special Foundation of Outstanding Young Teacher of Shanghai     

股骨骨髓腔的形态学研究及其临床意义

目的建立国人股骨骨髓腔的形态学参数,为设计和选择适合国人的股骨髓内钉内固定器械提供形态学依据。方法选择正常成人股骨全长X线片(含标准正、侧位片)52例,应用图像分析软件进行形态学参数测量。结果股骨骨髓腔全长为(33.51±0.63)cm(男)和(33.13±0.64)cm(女);狭窄段长度为(5.61±0.49)cm(男)和(5.17±0.46)cm(女);髓腔最狭窄点位于髓腔中点近侧,距离为(3.55±0.15)cm(男)和(3.52±0.27)cm(女),狭窄点髓腔矢状径较冠状径大,分别为(1.215±0.113)cm和(1.077±0.116)cm,髓腔弧度半径为(120.608±6.089)cm。结论股骨骨髓腔长度、狭窄部形态及弧度等参数在交锁髓内钉的设计和应用中发挥着制约性作用。     

MR IMAGING OF GHE PANCREAS

MRimaging(MRI)Providesuniquesoft-tis-suecontrastandisanimportantdiagnostictech-niquefordiseaseofnumerousorgans.Butearlyre-sultsofMRlofpancreahavebeensomewhatdis-couraging"'.Atpresent,followingthetechnicalinnovationthequalityofMRIofpancreashasbeengreatlyimproved"~'>.Researchersundertooktheretrospectiveandprospectivestudiesofpatientswithpancreaticdis-easeto@evaluatetheabilityofvariousMRIse-quencestoshowthenormalpancreasandpancreat-icdiseases1@studythecharacteristicsofsignalin-tensity(SI)of…     

脑梗塞的磁共振成像与临床

本文讨论了80例脑梗塞磁共振成像与临床表现,其中20例有CT检查。多数病例磁共振成像显示为多发性脑梗塞(95%)。梗塞灶在T_1加权是低信号改变;T_2加权呈高信号改变,急性和慢性期特点一致。资料结果表明:磁共振成像定位准确(98.75%)。病灶检出T_2比T_1敏感,磁共振成像检出病灶多于CT。在诊断脑梗塞方面,磁共振成像优于CT。     

海马结构的磁共振体积测量

目的　定量测量正常成年人的海马结构 (HPF)体积 ,确定其正常值范围 ,作为影像学早期诊断Alzheimer病 (AD)及海马硬化 (HS)的参照标准。方法　冠状位MRI定量测量了 2 5 4例1 8～ 76岁年龄段的正常人海马结构体积、颞角宽度及全脑体积 ,并进行相关分析。结果　标准化后的HPF体积无性别及利手差异 ,右侧略大于左侧 (P <0 .0 5 ) ,左右之差为 ( 0 .1 0± 0 .2 6)cm3。HPF体积与年龄、颞角宽度呈负相关 ,与全脑体积呈正相关。HPF体积各年龄段间有差异(P <0 .0 5 ) ,其正常值中青年组 (年龄 <60岁 )为 :左 ( 2 .64± 0 .43)cm3,右 ( 2 .74± 0 .44)cm3;老年组 (≥ 60岁 )为 :左 ( 2 .44± 0 .37)cm3,右 ( 2 .47± 0 .42 )cm3。结论　海马结构体积有左右侧及年龄段间的差异 ,实际工作中应预以重视 ,以免误诊。     

THE MORPHOLOGICAL MEASURE OF THE TIBIAL MEDULLARY CAVITY AND ITS SIGNIFICANCE

Tibiaisoneofthemostimportantbonesthatbearaheavyburden ,anditisthe partthatmostfracturewasmostlyhappenedinlong pipebones.Thetibiaandfibulafracturesareabout 13.7%intotalfracture .Weoftentreatthetibiafracturewithintramedullarynailfixation ,soitschoiceanddesignmustbebasedontheanatomiccharacteroftibialmedullarycavity .Butthemorphologicalinvestiga tionofChinesetibialmedullarycavitywassoless.Thisstudymeasuredandestablishedthemorpholog icalparametersofChinesetibialmedullarycavity ,andprovidedthemorph…     

基于Crotex-M3和GPRS的远程监测系统的研究

研制出了一款运行高效、成本低、通用性较强的电梯运行状况监测系统。系统基于具有Crotex-M3内核的高性价比嵌入式系统,采集电梯各类传感器信息,获取电梯运行方向、平层状态、门状态、温湿度以及电梯内是否有人等多参数数据,再通过GPRS将数据发送至数据中心。根据电梯的运行数据,判断电梯是否正常运行,以及紧急情况下进行自动报警,实现了多区域内电梯运行状态集中监测和故障自动报警。系统实际运行效果良好,通用性强,可以满足多种型号电梯的监测。     

青年人胆石症发病率、胆囊容积及其排空能力的调查报告

我们在研究《脉冲排石机理及其胆囊收缩素水平、胆囊容积的关系》时,随机抽查了522名16岁～20岁青年学生的胆囊容积及其排空能力,结果:女性胆囊容积=9.74±3.96(ml);男性胆囊容积=12.89±4.86(ml),脂餐后1h女性胆囊收缩64.7%,男性收缩71.1%;胆囊容积与体表面积呈直线相关(r=0.6821);从522名被检者中共检出5例胆石症,男1例,女4例,检出率为0.94%。     

Exploiting Local and Global Characteristics for Contrast Based Visual Saliency Detection

Visual saliency is an important cue in human visual system to identify salient region in the image;it can be useful in many applications including image retrieval,object recognition,image segmentation,etc.Image contrast has been used as an effective feature to detect visual salient region.However,the conventional contrast measures either in spectral domain or in spatial domain fail to give sufficient consideration towards the local and global characteristics of the image.This paper presents a visual saliency detection algorithm based on a novel contrast measurement.This measurement extracts the spectral information of image block using the 2D discrete Fourier transform(DFT),and combines with the total variation(TV)of image block in spatial domain.The proposed algorithm is used to perform salient region detection in the image,and compared with state-of-the-art algorithms.The experimental results from the MSRA dataset validate the effectiveness of the proposed algorithm.     

Research on Spatially Adaptive High-Order Total Variation Model for Weak Fluorescence Image Restoration

Photoacoustic imaging acquires the absorption contrast of biological tissue with ultrasound resolution. It has been broadly investigated in biomedicine for animal and clinical studies. Recently, a micro-electro-mechanical system (MEMS) scanner has been utilized in photoacoustic imaging systems to enhance their performance and extend the realm of applications. The review provides a recap of recent developments in photoacoustic imaging using MEMS scanner, from instrumentation to applications. The topics include the design of MEMS scanner, its use in photoacoustic microscopy, miniature imaging probes, development of dual-modality systems, as well as cutting-edge bio-imaging studies.     

Joint distortion model for progressive image transmission using error correcting arithmetic codes

A novel joint source channel distortion model was proposed, which can essentially estimate the average distortion in progressive image transmission. To improve the precision of the model, the redundancy generated by a forbidden symbol in the arithmetic codes is used to distinguish the quantization distortion and the channel distortion, all the coefficients from the first error one to the end of the sequence are set to be a value within the variance range of the coefficients instead of zero, then the error propagation coming from the entropy coding can be essentially estimated, which is disregarded in the most conventional joint source channel coding （JSCC） systems. The precision of the model in terms of average peak-signal-to-noise has been improved about 0.5 dB compared to classical works. An efficient unequal error protection system based on the model is developed, and can be used in the wireless communication systems.     

脊髓损伤后大鼠后肢运动功能恢复不同评分标准的比较

目的比较脊髓损伤(SCI)后大鼠后肢运动功能恢复的不同评分标准的优劣。方法40只SD成熟雌性大鼠随机分为正常组(Normal组)、急性脊髓中度损伤组(SCI组)及对照组(CON组),其中SCI组采用改良的Allen打击法,CON组仅行T10椎板切除术。术后1、2、3、4、6周观察大鼠后肢神经功能恢复的情况并记录结果。评价标准分别为:斜板试验评分、改良Tarlov评分及BBB评分。结果SCI组与CON组比较,斜板试验临界角度在1-6周时,均有所减小(P<0.05),尤以第1周时减少更甚(P<0.01);改良Tarlov评分第1、2、3、4周时,分值间的差别非常明显(P<0.01),第6周时,未见变化(P>0.05);而BBB评分各时间点的区分程度非常明显(P<0.01)。结论BBB评分对SCI模型运动功能评价具有明显优势,可作为今后研究的标准评分法。     

Photoacoustic Imaging by Use of Micro-Electro-Mechanical System Scanner

Photoacoustic imaging acquires the absorption contrast of biological tissue with ultrasound resolution. It has been broadly investigated in biomedicine for animal and clinical studies. Recently, a micro-electromechanical system(MEMS) scanner has been utilized in photoacoustic imaging systems to enhance their performance and extend the realm of applications. The review provides a recap of recent developments in photoacoustic imaging using MEMS scanner, from instrumentation to applications. The topics include the design of MEMS scanner, its use in photoacoustic microscopy, miniature imaging probes, development of dual-modality systems,as well as cutting-edge bio-imaging studies.