A Generalized Crystallographic Description of All Tellurium Nanostructures

Despite tellurium being less abundant in the Earth's crust than gold, platinum, or rare‐earth elements, the number of industrial applications of tellurium has rapidly increased in recent years. However, to date, many properties of tellurium and its associated compounds remain unknown. For example, formation mechanisms of many tellurium nanostructures synthesized so far have not yet been verified, and it is unclear why tellurium can readily transform to other compounds like silver telluride by simply mixing with solutions containing silver ions. This uncertainty appears to be due to previous misunderstandings about the tellurium structure. Here, a new approach to the tellurium structure via synthesized structures is proposed. It is found that the proposed approach applies not only to these structures but to all other tellurium nanostructures. Moreover, some unique tellurium nanostructures whose formation mechanism are, until now, unconfirmed can be explained.     

Camera localization for a human-pose in 3D space using a single 2D human-pose image with landmarks: a multimedia social network emerging demand

Recovering a 3D human-pose in the form of an abstracted skeleton from a 2D image suffers from loss of depth information. Assuming the projected human-pose is represented by a set of 2D landmarks capturing the human-pose limbs, recovering back the original 3D locations is an ill posed problem. To recover a 3D configuration, camera localization in 3D space plays a major role, an inaccurate camera localization might mislead the recovery process. In this paper, we propose a 3D camera localization model using only human-pose appearance in a 2D image (i.e., the set of 2D landmarks). We apply a supervised multi-class logistic regression to assign the camera location in 3D space. In the learning process, we assume a set of predefined labeled camera locations. The features we train consist of relative length of limbs and 2D shape context. The goal is to build a relation between these projected landmarks and the camera location in 3D space. This kind of analysis allows us to reconstruct 3D human-poses based on the 2D projection only without any predefined camera parameters. Also, makes real-time multimedia exchange more reliable specially for human-pose related tasks. We test our model on a set of real images showing a variety of camera locations.

     

^211At通过DTPA酸酐标记IgG

研究了２１１Ａｔ通过二乙撑三胺五乙酸（ＤＴＰＡ）酸酐标记人免疫球蛋白Ｇ（ＩｇＧ）的方法。合成ＤＴＰＡ酸酐后与人ＩｇＧ反应，制得ＤＴＰＡ－ＩｇＧ。Ｎａ２１１Ａｔ溶液与分离纯化后的ＤＴＰＡ－ＩｇＧ在室温下反应３０ｍｉｎ，经ＳｅｐｈａｄｅｘＧ５０柱分离纯化，得２１１Ａｔ－ＤＴＰＡ－ＩｇＧ的０．１ｍｏｌ／ＬＰＢＳ淋洗液。整个标记过程可在１．５ｈ完成，全程标记率在６０％以上。测定了２１１Ａｔ－ＤＴＰＡ－ＩｇＧ在体外的稳定性，并通过比较标记物与Ｎａ２１１Ａｔ注射液在ＮＩＨ小鼠体内的分布和代谢，评价了２１１Ａｔ－ＤＴＰＡ－ＩｇＧ在体内的稳定性。     

直流X射线模拟电缆X射线响应的可行性

本文对电缆X射线辐照响应的机理和模拟方法进行了研究,分析了电缆直流和脉冲X射线辐照响应的异同。建立了带状电缆X射线辐照响应一维计算模型,该模型包含电缆屏蔽层和介质层间隙、介质层瞬态辐射感应电导率等计算模型,模拟了带状电缆直流和脉冲X射线辐照电流响应。模拟结果表明,在X射线注量相同的条件下,电缆直流和方波脉冲X射线响应具有类似的波形特征及相同的间隙电压。因此,在该计算模型描述的电缆X射线辐照响应机制下,可利用直流X射线开展相应的脉冲X射线辐照响应机制模拟。     

一种可用于化学传感的对角对称光子晶体光纤设计

本文提出了一种可用于化学传感的具有高双折射、低损耗的光子晶体光纤,并系统地分析了空气孔参数对光纤光学特性的影响.研究表明,最优结构的光纤在典型波长1.55μm时对水、乙醇和苯的相对灵敏度分别可达56.3％、59.9％和62.5％,相比现有光子晶体光纤分别提高1.05～6.25倍、1.05～4.99倍和1.03～4.63...     

木瓜叶多酚的提取及抗氧化活性研究

以提取木瓜叶多酚并研究其抗氧化活性为目的。利用乙醇提取木瓜叶多酚,采用DPPH法、水杨酸法检测其对DPPH.和.OH的清除作用。结果表明,最佳提取条件为提取温度70℃、乙醇体积分数70%、提取时间2.5 h、料液比1∶15(m/V)。在该条件下木瓜叶多酚得率最高,达到18 mg/g。木瓜叶多酚清除DPPH.和.OH的半抑制质量浓度(EC50)分别为67μg/mL和0.44 mg/mL。结论为木瓜叶中含有丰富的多酚,并且其具有较强的抗氧化活性。     

烧碱-蒽醌法麦草浆OHP漂白

对Soda-AQ麦草浆少污染OHP漂白进行了研究.实验结果表明,使用少污染OHP三段漂白,氧漂时NaOH用量3%,未漂浆的脱木素率达44.03%,随后的次氯酸盐漂白只需3%有效氯用量即可将浆料漂至75.05%ISO,再用2%H2O2进行漂白,纸浆最终白度可达80.55%ISO,纸浆黏度为464.9mL/g.     

晶界添加氧化物对烧结NdFeB磁性能的影响

为了提高NdFeB磁体的磁性能,通过球磨混粉的方式,研究了通过在晶界上添加MgO,SiO2和CaO对烧结NdFeB磁性能的影响,并采用扫描电镜分析了添加物在晶界相中的分布。研究结果表明,晶界添加适量MgO可实现磁体剩磁、最大磁能积的提高,矫顽力几乎保持不变,在当前实验条件下,当添加量为0.1%时磁性能达到最大值。     

Reduction Behaviour of BOF Slags by Carbon in Iron

Experiments were carried out in a system with BOF slags from industrial operations in order to optimize the conditions of recycling BOF slags produced in the steelmaking process. Reduction reactions of FeO and P₂O₅ proceeded steadily and the FeO reduction rate was almost identical to that of P₂O₅. The reduction reaction of FeO and P₂O₅ in BOF slag at the slag/gas interface is the rate‐controlling step. The reaction rates of FeO and P₂O₅ by dissolved carbon in molten iron are of first order with respect to their respective concentrations. The reduction reactions of FeO and P₂O₅ by dissolved carbon in iron are much closer to the equilibrium state compared with the reduction by solid carbon. It is necessary to control the portion of phosphorus vaporization during reduction treatment in order to obtain efficient operational conditions for BOF slag reduction.     

井下模拟信号的转换传输

油田测井中,井下的测量参数输出信号为模拟量,本文详细介绍了本设计方案中将井下模拟信号转换成频率信号的原理,通过铠装将频率信号传送到地面,以及地面频率信号还原成模拟信号的原理,对设计进行了实验室验证.