基于脊波变换的手指静脉图像增强研究

针对人体手指静脉图像的结构和特点,提出一种基于脊波变换的图像增强算法.该算法对手指静脉图像小波域各高频子带系数进行脊波变换,利用非线性新脊域系数确定法对脊域系数进行处理,然后对各高频子带进行脊波逆变换和小波图像重构.该算法对手指静脉二维曲线奇异处理、边缘增强等具有较好的效果,克服了小波变换在高维曲线奇异和方向选择上的不足.通过与传统的二维离散小波变换边缘增强法和自适应调整系数的脊波变换方法作比较,实验结果表明本算法具有更好的手指静脉图像效果.     

倾斜极薄软破矿体壁式削壁崩落采矿法研究

根据伊什坦贝尔德金矿所在国家的特点、矿体开采技术条件,开发了以壁式崩落法为主,结合削壁充填法和全面法工艺特点的壁式削壁崩落采矿法,对该矿倾斜软弱破碎极薄矿体进行分采。试验结果表明,该法回采率达到91.56%、贫化率仅13.73%,综合生产能力42.3 t/a,采矿成本58.89元/t,为倾斜极薄软破矿体的高效安全开采提供了一个新思路。     

妇科恶性肿瘤术后深静脉血栓形成患者组织因子、组织因子途径抑制物的检测及意义探讨

目的检测妇科恶性肿瘤术后下肢深静脉血栓形成的患者血浆中组织因子(TF)、组织因子途径抑制物(TFPI-2)水平的变化,探讨其与妇科恶性肿瘤术后深静脉血栓形成的相关性。方法用ELISA法分别检测妇科良恶性肿瘤术后患者组织因子(TF)、组织因子途径抑制物(TFPI-2)血浆水平变化。结果妇科恶性肿瘤组TF血浆水平显著高健康对照组(P<0.01)。有深静脉血栓形成妇科恶性肿瘤组TF血浆水平与无深静脉血栓形成妇科恶性肿瘤组相比,差异有统计学意义(P<0.01)。有深静脉血栓形成妇科恶性肿瘤组TFPI-2血浆水平与健康对照及无深静脉血栓形成妇科恶性肿瘤组相比之间无统计学差异(P>0.05)。结论妇科恶性肿瘤术后深静脉血栓形成患者组织因子TF明显增高,可作为检测妇科肿瘤尤其是妇科恶性肿瘤术后深静脉血栓形成的重要指标。TFPI-2血浆水平无明显临床指导意义。     

基于SURF算子的快速手背静脉识别

提出基于加速鲁棒性特征(speeded-up robustfeatures,SURF)的手背静脉识别算法.首先对手背静脉图像进行预处理,提取手背静脉感兴趣区域(ROI),然后提取手背静脉的局部SURF特征,基于欧式距离实现测试样本和注册样本特征点的匹配,并剔除错误匹配对,最后计算匹配率作为待识别样本和注册样本之间的相似度测试实现身份识别.利用TJU手背静脉图像数据库对算法性能进行测试,在认证模式下等错率为0.07%,平均识别时间0.153 s.实验结果证明该算法可以快速有效地实现手背静脉识别.     

额尔古纳成矿带脉状银（铅锌）矿床与塔木兰沟组火山岩的成矿关系

额尔古纳成矿带浅成热液脉状银（铅锌）矿床以上侏罗统塔木兰沟组中基性火山岩为主要容矿围岩。围岩蚀变特征及银的降低场表明中基性火山岩提供了部分成矿物质。塔木兰沟组中基性火山岩是成矿的必要条件之一。其中发育的退色蚀变带是主要找矿标志。     

矿岩分采提高低品位缓倾斜薄矿脉回采效率的技术探讨

针对低品位缓倾斜薄矿脉开采矿石损失大、贫化率高、回采经济效益差的问题,提出了矿岩分采分出铲运机出矿的技术方法,对试验采场布置和回采工艺进行了探讨。结果表明,这一新的技术方法有利于提高矿石回收率,降低贫化,提高回采效率。     

无花果乳浆石油醚萃取产物对高糖诱导血管内皮细胞损伤的保护作用

该文研究了药食两用植物无花果所含有的乳浆对于高糖所致人脐静脉血管内皮细胞（Huvec）损伤的保护作用,并初步探讨作用机制。采用系统溶剂萃取法制得无花果乳浆的不同极性供试品,建立Huvec细胞高糖损伤模型,分别采用MTT法、“划痕实验”、Transwell侵袭实验、流式细胞仪凋亡检测、血管生成试验和ELISA法考察无花果乳浆的保护效果及作用机制。结果显示,高糖环境使Huvec细胞48 h内增殖率、迁移率、侵袭率分别下降至76.04%、28.36%、22.09%（p<0.001）,凋亡率上升至24.23%（p<0.001）,血管形成能力下降,乳酸脱氢酶（LDH）、血管内皮生长因子（VEGF）和内皮素-1（ET-1）含量分别升高至20.96 μg/L、90.03 ng/L、839.41 ng/L（p<0.01）,超氧化物歧化酶（SOD）、一氧化氮（NO）和内皮型一氧化氮合酶（eNOS）含量分别下降至3.52 μg/L、184.75 μmol/L、0.59 IU/mL（p<0.01）,100、200、400 mg/L无花果乳浆石油醚萃取产物可显著性提高Huvec细胞增殖、迁移和侵袭能力及降低凋亡率（p<0.001）,恢复紊乱的血管生理因子水平。无花果乳浆的石油醚萃取产物可以减轻高糖引起的Huvec损伤,具有明显的细胞保护作用。     

Using Mean Field Theory to Guide Biofunctional Materials Design

Cell‐instructive characteristics of extracellular matrices (ECM) resulting from a subtle balance of biomolecular and biophysical signals must be recapitulated in engineered biomaterials to facilitate regenerative therapies. However, no material explored so far allows the independent tuning of the involved molecular and physical cues due to the inherent correlation between biopolymer concentration and material properties. Addressing the resulting challenge, a rational design strategy for ECM‐inspired biohybrid hydrogels based on multi‐armed poly(ethylene glycol) and heparin, adapting a mean field approach to identify conditions at which the balance of elastic, electrostatic, and excluded volume forces results in constant heparin concentrations within swollen polymer networks with gradually varied physical properties is introduced. Applying heparin‐based biofunctionalization schemes, multiple distinct combinations of matrix parameters could be identified to effectively stimulate the pro‐angiogenic state of human endothelial cells and the differentiation of human mesenchymal stem cells. The study demonstrates the power of joint theoretical and experimental efforts in creating bioactive materials with specifically and independently controllable characteristics.     

粤北石人嶂钨矿床稀土元素地球化学特征及其指示意义

通过系统研究与成矿关系密切的莲花山花岗岩以及钨矿脉、云英岩和旁侧花岗岩的稀土元素地球化学特征,并进行对比分析,探讨粤北石人嶂钨矿床的成矿环境与成矿物质来源。研究表明,面型云英岩与脉侧云英岩以及相关的两类花岗岩的稀土元素组成存在明显差异,具有不同的物质来源,显示两期岩浆侵入与热液活动叠加特点;深部3种花岗岩及其脉侧云英岩的稀土配分模式很相似,表明具有相同的物质与热液来源;隐伏花岗岩体从浅部到深部,稀土总量、δEu值逐渐变小,显示岩浆岩结晶分异程度逐渐增强,为钨矿床形成提供了成矿物质来源;云英岩与花岗岩的稀土配分模式具有一定相似性,都是轻稀土富集,强烈铕亏损,而石英脉大多呈铕富集,相对富集轻稀土;随着成矿时间的推移,成矿环境由还原到相对氧化。因此,石人嶂钨矿床成矿热液与晚期岩浆热液具有相似性和继承性,成矿物质来源除了深部的白云母花岗岩,部分可能来自上部地壳。     

Differential diagnostics of portal hypertension studied by MR imaging

This study has examined the ability of magnetic resonance imaging (MRI) to reveal the features of intrahepatic and extrahepatic portal circulation in portal hypertension syndrome (PHS). A retrospective analysis of the abdominal MRI examinations of 96 patients was performed. The spin-echo imaging technique was used to obtain coronal, transaxial, and sagittal images for all patients. The main distinctive features of revealed extrahepatic PHS in nine patients were the thrombosed lumen of the portal vein, the widespread net of collateral vessels around the portal vein, and the widened hepatic artery. The smooth liver surface without evident disturbances of the architectonics of intrahepatic vasculature was depicted in all patients and the caudal lobe hypertrophy was observed in five patients. The widening of the azygos vein was displayed in six of nine patients and hemiazygos vein was delineated in one case. Typical morphologic features of liver cirrhosis and different degrees of the stenosis of the intrahepatic segment of the inferior vena cava (IVC) (10–30%) were found in 28 patients. More than 30% stenosis of the IVC was displayed in 7 of 18 patients (average 28%) with the preascitic liver cirrhosis and in all patients with ascites (average 47%). In two patients the Budd-Chiari syndrome was characterized by the reduced caliber or by the absence of hepatic veins, the comma-shaped intrahepatic collateral vessels, and the constriction of the intrahepatic IVC. The primary ascending thrombosis of the IVC (1 patient) and the occlusion or direct extensions of tumor (16 patients) were usually well seen on MR images.