Analysis of the joint detection capability of the SMILE satellite and EISCAT-3D radar

The Solar wind Magnetosphere Ionosphere Link Explorer(SMILE)satellite is a small magnetosphere–ionosphere link explorer developed cooperatively between China and Europe.It pioneers the use of X-ray imaging technology to perform large-scale imaging of the Earth’s magnetosheath and polar cusp regions.It uses a high-precision ultraviolet imager to image the overall configuration of the aurora and monitor changes in the source of solar wind in real time,using in situ detection instruments to improve human understanding of the relationship between solar activity and changes in the Earth’s magnetic field.The SMILE satellite is scheduled to launch in 2025.The European Incoherent Scatter Sciences Association(EISCAT)-3D radar is a new generation of European incoherent scatter radar constructed by EISCAT and is the most advanced ground-based ionospheric experimental device in the high-latitude polar region.It has multibeam and multidirectional quasi-real-time three-dimensional(3D)imaging capabilities,continuous monitoring and operation capabilities,and multiple-baseline interferometry capabilities.Joint detection by the SMILE satellite and the EISCAT-3D radar is of great significance for revealing the coupling process of the solar wind–magnetosphere–ionosphere.Therefore,we performed an analysis of the joint detection capability of the SMILE satellite and EISCAT-3D,analyzed the period during which the two can perform joint detection,and defined the key scientific problems that can be solved by joint detection.In addition,we developed Web-based software to search for and visualize the joint detection period of the SMILE satellite and EISCAT-3D radar,which lays the foundation for subsequent joint detection experiments and scientific research.

一种具有识别Hg^(2+)和ClO^(-)荧光探针的设计和应用

设计合成了一种含双酯基的1,2,3-三氮唑化合物,与罗丹明B酰肼结合生成了具有“开-关”性质的荧光探针(简称L_(2)),应用光谱学表征了L_(2)的物理化学参数。L_(2)分别在DMF/Tris-HCl(1:1,v/v,pH=6.0,20μmol/L)和MeOH(20μmol/L)溶液中对Hg^(2+)和ClO^(-)显示出高选择性和灵敏性;利用荧光和紫外光谱分别测定了L_(2)对19种金属离子和14种阴离子的光学性能。实验表明,Hg^(2+)和ClO^(-)的存在使得L_(2)在585 nm和576 nm均有一个新的发射峰出现;同时伴随着荧光强度明显的增强,溶液体系发生了裸眼能识别的显色变化,表明Hg^(2+)可以将罗丹明分子的酰肼闭环结构转换为开环结构,并以1:2的比例方式生成了一种新配合物,这也被质谱、工作曲线、核磁滴定和TD-DFT计算的结果所证实;L_(2)对Hg^(2+)和ClO^(-)的检测限分别为7.45 nmol/L和0.67μmol/L。此外,生物活性测定显示L_(2)对HeLa细胞有非常低的毒性,并且可用于HeLa细胞中Hg^(2+)和ClO^(-)的细胞成像,表明L_(2)在体内可进行微测定Hg^(2+)和ClO^(-)的巨大潜力。

菲并咪唑反应型ClO^(-)荧光探针的合成及光谱性能

荧光探针法以其灵敏度高、选择性强和实时响应等优点被广泛应用于生物体和环境检测.因此,开发结构多样的荧光探针具有非常重要的理论和实际意义.基于菲并咪唑发光团,设计合成了一个含有苯甲酰肼结构的亚胺型菲并咪唑反应型ClO^(-)荧光探针(PIP-BH),并对合成的荧光探针结构进行了表征和确认.通过紫外光谱和荧光光谱对探针PIP-BH在水相中的聚集诱导淬灭(aggregation-caused quenching,ACQ)效应进行了研究,并通过丁达尔效应和扫描电子显微镜测试(SEM)直观观察了探针PIP-BH在水溶液中的聚集效果.在MeOH/PBS(f_(w)=40%,PBS 0.01mol·L^(-1),pH=7.4)缓冲溶液中,通过荧光光谱详细讨论了探针PIP-BH对ClO^(-)的荧光响应特征,探针PIP-BH能够选择性地识别ClO^(-),并伴随着发射波长的蓝移,响应的pH范围内(5.0~11.0)较宽,具有较好的实际应用价值.

Multi-features Based Approach for Moving Shadow Detection

In the video-based surveillance application, moving shadows can affect the correct localization and detection of moving objects. This paper aims to present a method for shadow detection and suppression used for moving visual object detection. The major novelty of the shadow suppression is the integration of several features including photometric invariant color feature, motion edge feature, and spatial feature etc. By modifying process for false shadow detected, the averaging detection rate of moving object reaches above 90% in the test of Hall-Monitor sequence.

Clinical significance of serum tumor markers CA153, CA125, CA72-4 and FIB, IL-6 levels detection in ovarian cancer

Objective: To investigate the clinical significance of serum tumor markers CA153, CA125, CA72-4 and FIB, IL-6 levels in the detection of ovarian cancer. Methods: A total of 40 patients with ovarian carcinoma treated in our hospital from September 2015 to June 2017 were selected as the ovarian cancer group;40 patients with benign ovarian tumors in the same period were selected as the benign ovarian tumor group;40 healthy subjects were selected as the control group. The levels of tumor markers CA153, CA125, CA72-4 and FIB, IL-6 were compared between the three groups. Results: The CA153, CA125, CA72-4 and FIB, IL-6 levels of the ovarian cancer group were significantly higher than those in benign ovarian tumor group and the control group;these levels in the benign ovarian tumor group was not significantly different from those in the control group. With the increase of clinical phase, the levels of CA153, CA125 and CA72-4 in patients with ovarian cancer were gradually increased, and the levels in phase Ⅲ and Ⅳ were significantly higher than those in phase Ⅱ and in phase I;and the CA125 in phase Ⅱ was significantly higher than that in phase Ⅰ. The levels of FIB and IL-6 in phase Ⅱ and in phase Ⅲ, Ⅳ were significantly higher than those in phase I;the IL-6 level in phase Ⅲ, Ⅳ was significantly higher than that in phase Ⅱ. Conclusion: Serum tumor markers CA153, CA125, CA72-4 and FIB, IL-6 levels for ovarian cancer detection can be helpful for clinical diagnosis and worthy of promotion.

BACKGROUND RECTIFICATION AND FEATURE EXTRACTION OF IMAGE IN A SPOT WELD OF AL ALLOY X-RAY DETECTION

A primary study on Processing in X - ray inspection of spot weld for aluminum alloy spot welding,in- cluding for background simulation,acquisition of ideal binary image, and extraction and identifi- cation of defect features was presented.

Obstacle detection using multi-sensor fusion

This paper presents an obstacle detection approach for blind pedestrians by fusing data from camera and laser sensor.For purely vision-based blind guidance system,it is difficult to discriminate low-level obstacles with cluttered road surface,while for purely laser-based system,it usually requires to scan the forward environment,which turns out to be very inconvenient.To overcome these inherent problems when using camera and laser sensor independently,a sensor-fusion model is proposed to associate range data from laser domain with edges from image domain.Based on this fusion model,obstacle's position,size and shape can be estimated.The proposed method is tested in several indoor scenes,and its efficiency is confirmed.

5-(2-Hydroxylphenyl)diazo-dipyrromethane:Synthesis,Structure and Fluoride Ion Detection

A new azopyrrole compound, 1, has been synthesized and characterized. The crystal of 1 is of monoclinic system, space group P21/c with a = 8.7167（9）, b = 17.5929（19）, c = 12.8096（15） ？, β = 97.565（2）o, V = 1947.3（4） ^3, Z = 4, C（20）H（26）N4O2, Mr = 354.45, Dc = 1.209 g/cm^3, F（000） = 760 and μ（Mo Kα） = 0.080 mm^-1. In the crystal, 1 binds one methanol molecule through N–H…O, O–H…O and O–H…π interactions. UV-Vis titration and 1H NMR titration studies reveal that compound 1 can selectively detect fluoride ion in the DMSO solution.

Significance of combined detection of serum 25(OH)D3, hsa-miR-17-5p and HCV-RNA in the diagnosis of hepatitis C disease

Objective: Significance of combined detection of serum 25(OH)D3, hsa-miR-17-5p and HCV-RNA in diagnosis of hepatitis C disease. Methods: A total of 52 patients with benign ovarian tumor resection were selected from April 2016 to April 2018 in our hospital. We paid attention to the implementation of perioperative nursing intervention, and observed the prognosis and the occurrence of adverse reactions. Results: The expression of hsa-mir-17-5p in the observation group was significantly higher than that in the control group, the expression of 25(OH)D3 was lower than that in the control group, the expression of hsa-mir-17-5p in the HCV-RNA positive group was higher than that in the HCV-RNA negative group, and the expression of 25(OH) D3 was lower than that in the HCV-RNA negative group. The expression of HCV-RNA in the observation group was positively and negatively correlated with the expression of 25(OH) D3 and hsa-mir-17-5p in the 25(OH)D3 and the critical values of serum 25 (OH)D3, hsa-mir-17-5p and HCV-RNA were 24.23 ug/L, 1.89 relative expression and 1.22 × 103 IU/mL, respectively. The area of AUC detected by hsa-miR-17-5p+ 25 (OH) D3+25(OH)D3 is larger than that detected separately. Conclusion: The combined detection of serum 25(OH)D3, hsa-mir-17-5p and HCV-RNA has high diagnostic efficiency and sensitivity for hepatitis C. It is suggested that they be used in clinical practice.

基于二氨基马来腈快速识别ClO^(-)的荧光探针及应用

由水杨醛衍生物和二氨基马来腈合成了一种荧光探针L.探针L在V(DMF)∶V(H_(2)O)=3∶7,pH=6.71的溶液中通过荧光信号“开启”,表现出对ClO^(-)的高选择性.此外,探针L对ClO^(-)的响应快速(200s),具有良好的抗干扰能力,检测限为1.03μmol/L,pH适用范围为6~10,可成功应用于水样品中ClO^(-)的检测.

离子色谱法测定液碱中Cl^-、ClO^(3-)、SO_4^(2-)含量

本文建立了用离子色谱法同时测定液碱中Cl^-、ClO^(3-)、SO_4^(2-)含量的分析方法。实验采用亲水性较强的阴离子交换分离柱,电导检测器,碳酸钠和碳酸氢钠混合溶液为淋洗液。样品前处理通过H型预处理柱后直接进样测定。该方法主要用于化工产品液碱中Cl^-、ClO^(3-)、SO_4^(2-)含量的快速分析,具有操作简便、快速、灵敏度高等特点。

基于四苯基乙烯-罗丹明的HClO/ClO^(-)可视化荧光探针的合成及性质研究

次氯酸(HOCl)/次氯酸盐(ClO^(-))作为一种强氧化剂应用广泛,在机体免疫防御中也起着至关重要的作用,过量HOCl/ClO^(-)对环境及人体造成潜在威胁。因此,建立可靠、精准检测HOCl/ClO^(-)的分析方法具有重要意义。通过缩合、还原两步合成得到具有聚集诱导性质的四苯基乙烯-罗丹明类衍生物TPE-RhB2,探针TPE-RhB2在乙醇/水溶液中实现了对ClO^(-)的可视化荧光识别,在505 nm处荧光发生猝灭,猝灭比为90.2%,同时在572 nm处出现新的荧光发射峰。该探针在pH 1~12内荧光响应稳定,并具有较强的抗干扰能力和灵敏度,检出限低至5.32×10^(-7) mol/L,Stokes位移高达155 nm,有望在复杂环境中实现对ClO^(-)的检测。通过ESI-MS谱初步确定ClO^(-)通过氧化水解机制引起了荧光信号和探针溶液颜色变化,根据所建分析方法实现了实际水样中ClO^(-)的检测。

基于水内标的NO^(-)_(3),SO^(2-)_(4),ClO^(-)_(4)拉曼光谱定量分析研究

拉曼光谱由于重现性差,在进行定量分析时往往需要内标。在水溶液中,水在2700~3900 cm^(-1)范围伸缩振动拉曼峰很强,有作为内标的可能性,但水与溶质的相互作用会导致水伸缩振动拉曼峰形状发生变化,此外水的占比也会随着溶质浓度的变化而变化,当溶质浓度较高时需要对水的含量进行校正。将这两点因素考虑在内,研究了以水为内标,采用拉曼光谱法测量水溶液中NO^(-)_(3),SO^(2-)_(4)和ClO^(-)_(4)浓度的适用性。不同浓度NaNO_(3),Na_(2)SO_(4)和NaClO_(4)溶液的拉曼光谱显示随着盐浓度的升高水在2700~3900 cm^(-1)范围内的拉曼峰呈现出左肩下降右肩上升的变化趋势。将三种盐溶液拉曼光谱中酸根离子拉曼峰面积(A_(盐))和水的拉曼峰面积(A H_(2)O)的比值(R^(S)=A_(盐)/A H_(2)O)与溶液中酸根离子和水的含量的比值(c_(盐)/c H_(2)O)作图,均呈现出良好的线性关系,拟合得到三条相关曲线的R^(2)分别为0.9991,0.9991和0.9994,说明酸根离子和水的拉曼散射系数均未发生变化或者在同比例变化。虽然水拉曼峰的形状发生了改变,但并不会影响水作为内标的可行性。在引入水的含量修正后,经理论推导c_(盐)与R^(S)符合关系式:c_(盐)=AR^(S)/(1+BR^(S))。在0.1 mol·L^(-1)到近饱和的宽浓度范围内,将R^(S)对c_(盐)作图,通过数据拟合获得的NaNO_(3),Na_(2)SO_(4)和NaClO_(4)的工作曲线分别为c NaNO_(3)=18.8 R^(S)/(1+0.6 R^(S))(R^(2)=0.9991),c Na_(2)SO_(4)=20.2 R^(S)/(1+1.0 R^(S))(R^(2)=0.9988),c NaClO_(4)=15.0 R^(S)/(1+0.7 R^(S))(R^(2)=0.9998)。NaNO_(3),Na_(2)SO_(4)和NaClO_(4)的检出限分别为0.0080,0.0052和0.0073 mol·L^(-1)。在水拉曼峰形状变化不影响其作内标可行性的基础上,当溶液中同时存在两种阴离子时,通过在水含量修正部分加入干扰离子对水含量的影响,可以在单盐溶液定量工作曲线中加入校正项来消除溶液中干扰离子对待测离子分析结果的干扰,但当干扰离子浓度较大而待测离子浓度较小时,干扰离子拉曼峰强度过大会影响到待测离子拉曼峰面积的准确性,从而使得校正的效果下降。

Cooperative Spectrum Sensing over Generalized Fading Channels Based on Energy Detection

This paper analyzes the unified performance of energy detection(ED) of spectrum sensing(SS) over generalized fading channels in cognitive radios(CRs). The detective performance of SS will be obviously affected by fading channels among communication nodes, and ED has the advantages of fast implementation, no requirement of priori received information and low complexity, so it is meaningful to investigate ED over various fading channels. The probability density function(p.d.f.) of α-κ-μ distribution is derived to evaluate energy efficiency for sensing systems.The detection probability with Marcum-Q function has been derived and the close-form expressions with moment generating function(MGF) method are deduced to achieve SS.Furthermore, exact closed-form analytic expressions for average area under the receiver operating characteristics curve( AUC) also have been deduced to analyze the performance characteristics of ED over α-κ-μ fading channels.Besides, cooperative spectrum sensing(CSS) with diversity reception has been applied to improve the detection accuracy and mitigate the shadowed fading features with OR-rule. At last, the results show that the detection capacity of ED will be evidently affected by α-κ-μ fading channels, but appropriate channel parameters can improve sensing performance. In addition, the establishedED-fading pattern is approved by simulations,and it can significantly enhance the detection performance of proposed algorithms.

Test analysis of detection of damage to a complicated spatial model structure

A two-stage damage detection approach is proposed and experimentally demonstrated on a complicated spatial model structure with a limited number of measurements. In the experiment,five known damage patterns,including 3 brace damage cases and 2 joint damage cases,were simulated by removing braces and weakening beam鈥揷olumn connections in the structure. The limited acceleration response data generated by hammer impact were used for system identification,and modal parameters were extracted by using the eigensystem realization algorithm. In the first stage,the possible damaged locations are determined by using the damage index and the characteristics of the analytical model itself,and the extent of damage for those substructures identified at stage I is estimated in the second stage by using a second-order eigen-sensitivity approximation method. The main contribution of this paper is to test the two-stage method by using the real dynamic data of a complicated spatial model structure with limited sensors. The analysis results indicate that the two-stage approach is ableto detect the location of both damage cases,only the severity of brace damage cases can be assessed,and the reasonable analytical model is critical for successful damage detection.

3D obstacle detection of indoor mobile robots by floor detection and rejection

Obstacle detection is essential for mobile robots to avoid collision with obstacles.Mobile robots usually operate in indoor environments,where they encounter various kinds of obstacles;however,2D range sensor can sense obstacles only in 2D plane.In contrast,by using 3D range sensor,it is possible to detect ground and aerial obstacles that 2D range sensor cannot sense.In this paper,we present a 3D obstacle detection method that will help overcome the limitations of 2D range sensor with regard to obstacle detection.The indoor environment typically consists of a flat floor.The position of the floor can be determined by estimating the plane using the least squares method.Having determined the position of the floor,the points of obstacles can be known by rejecting the points of the floor.In the experimental section,we show the results of this approach using a Kinect sensor.

基于GC-FID、HS-SPME-GC-MS与电子鼻技术评价不同水果发酵酒的香气特征

采用气相色谱-氢火焰离子化检测器法(gas chromatography with hydrogen flame ionization detection,GCFID)、顶空固相微萃取-气相色谱-质谱(headspace solid-phase microextraction coupled with gas chromatography-mass spectrometry,HS-SPME-GC-MS)和电子鼻技术分析6种果酒中的挥发性成分,评价果酒风味轮廓特征的差异性。结果表明,GC-FID定量测定樱桃李酒,其中异戊醇、活性戊醇、β-苯乙醇含量最高,乙酸乙酯含量最低;木瓜酒中正丙醇、2,3-丁二醇、癸酸乙酯、乙酸含量最高; 3-羟基-2-丁酮含量在樱桃李酒中最高,山楂酒、甜橙酒中最少。HP-SPME-GC-MS鉴定果酒中挥发性物质94种,其中醇类23种,酯类43种,醛酮类10种,酸类8种,酚类2种,苯环类5种,烷烃类3种。山楂酒、菠萝酒、木瓜酒、甜橙酒、无花果酒和樱桃李酒中香气物质数量分别为34、44、45、45、33、47种。其中山楂酒、木瓜酒和无花果酒中未检出酚类、烷烃类物质。电子鼻对不同果酒香气的区分效果无重叠,W5S传感器区分果酒香气能力最强。比较而言,菠萝酒和樱桃李酒的口感更圆润,香气更愉悦,感官得分最高。

血清CEA、CA_(125)、CA_(19-9)联合检测对胃癌诊断的临床意义

目的探讨联合检测胃癌患者血清CEA、CA125、CA19-9水平在胃癌诊断中的意义。方法应用免疫荧光法检测160例胃癌血清CEA、CA125、CA19-9水平并进行分析。结果CEA、CA125、CA19-9阳性率分别为24.4%、37.5%、23.1%,三者联合检测阳性率为64.4%;CEA阳性率与性别、肿瘤浸润深度以及是否转移无明显相关,CA19-9阳性率与性别、肿瘤浸润深度无关,CA125女性高于男性,且与肿瘤浸润深度和是否转移密切相关。三者均与肿瘤部位和组织学类型相关。结论CEA、CA125、CA19-9三者联合检测可以提高胃癌的检出率。