Because of the rapid growth multimodal data from internet and social media, a cross-modal retrieval has become an important valuable task in recent years.The purpose is to obtain result one modality (e.g., image), which semantically similar query another text).In field remote sensing, despite great number existing works on image retrieval, there only been small amount research image-text due scarcity datasets complicated characteristics sensing data. In this article, we introduce novel...

Track irregularity is one of the most important factors in regular maintenance and overhaul work needed to determine state a railway for safe operation. In this paper, mobile approach measurement subway track proposed. A high-precision three-dimensional (3D) curve was surveyed by trolley equipped with laser-aided inertial navigation system (INS)/odometer system. Models measuring alignment, vertical, cant, twist irregularities were established. These four types estimated using 3D curve. To...

This paper proposes a novel motion field estimation method based on 3D light detection and ranging (LiDAR) sensor for sensing intelligent driverless vehicles active collision avoidance systems. Unlike multiple target tracking methods, which estimate the state of detected targets, such as cars pedestrians, regards whole scene in each little element has its own state. Compared to tracking, segmentation errors data association have much less significance estimation, making it more accurate...

Abstract The insufficiency of data is the essential reason for ill-posed problem existed in computerized ionospheric tomography (CIT) technique. Therefore, method integrating multi-source proposed. Currently, multiple satellite navigation systems and various observing instruments provide abundant which can be employed to reconstruct electron density (IED). In order improve vertical resolution IED, we do research on IED reconstruction by integration ground-based GPS data, occultation from LEO...

In this letter, we investigate the ionospheric variations associated with Yaan earthquake that occurred on April 20, 2013 in China by using total electron content (TEC) derived from ground-based Global Positioning System observations and a global ionosphere map (GIM). Geomagnetic solar activities are taken into account. First, focus coseismic disturbances of earthquake. The time period is about 15 min after seismic rupture, maximum amplitude 0.1 TEC units. We then examine preseismic...

Declining total fertility rates pose a severe challenge to the economy, society, culture, and politics of any region. Low among China’s rural floating population with strong are aggravating these challenges. Previous research has confirmed relationships between health insurance intention. However, it is still unclear whether existing association favorable or not. Moreover, majority studies in China employ data from either urban populations, whereas evidence populations remains scarce. Based...

A combined system, which consisted of an innovative septic tank (IST) and compound media filter bed (CMFB), was used for onsite domestic wastewater treatment in a rural area. Performance this system evaluated by both bench-scale pilot-scale experiments. The showed relatively good removal efficiency chemical oxygen demand (COD) suspended solids, but efficiencies total phosphorus (TP) nitrogen (TN) were not so impressive. Correlated regression models provided estimates the nutrient performance...

Abstract Infiltration through a soil system planted with four different species was assessed as sustainable treatment method for logyard runoff at field-scale experimental site in Sweden. Runoff infiltrated Alnus glutinosa (L.) Gärtner (common alder), Salix schwerinii × viminalis (willow variety “Gudrun”), Lolium perenne (rye grass), and Phalaris arundinacea (reed canary grass). Analyses of variance t tests showed no significant differences when the plants were compared each other, there...

A long tunnel is a typical linear man-made infrastructure. The shape, especially the cross-sectional and geometric parameters of are very important for safety transportation. multi-sensor integration approach presented to survey shape dynamically. With efficient collection high-precision spatial points structure surface, laser scanner widely used measuring structure's three-dimensional deformation. In this article, two scanners other position orientation sensors, such as DGPS, IMU, DMI,...

ç”±äºŽç¼ºä¹æœ‰æ•ˆå¹¶å ·æœ‰é’ˆå¯¹æ€§çš„æ–¹æ³•ä»¥åŠä¼ ç»Ÿé¥æ„Ÿå½±åƒçš„2维局限性,城市立交桥点的识别与轮廓提取存在较大困难。本文基于机载LiDAR点云数据提出一种城市立交桥的提取方法。首å...

Abstract Unplanted upflow filters, which were filled with different filter media (natural zeolite, blast furnace granulated slag, ceramsite, and walnut shells), operated to assess their nutrient removal performances. Different preprocessing methods involving aerobic anaerobic sludges applied the filters accelerate treatment processes. The results indicated that enhanced soluble chemical oxygen demand (SCOD) removal, but had no obvious influence on total nitrogen (TN) phosphorus (TP)...