Straw burning is a long-term environmental problem in China’s agricultural production. At present, China relies mainly on satellite remote sensing positioning and manual patrol to detect straw burning, which are inefficient. Due the development of machine learning, target detection technology can be used for but current research does not take into account various scenarios deployment object models. Therefore, lightweight network based depthwise separable convolution channel attention...

An experimental study is conducted on the surface shear stress vector distribution a plate in supersonic jet flow, with focus separation region. The shear-sensitive liquid crystal coating (SSLCC) technique employed for flow visualization and measurement, which based distribution, pattern captured. results demonstrate that nozzle pressure ratio (NPR) main inducement to evolution, high NPR causes region plate, where adverse challenging SSLCC technique. Therefore, an improved measurement method...

Facial expression recognition faces challenges where labeled significant features in datasets are mixed with unlabeled redundant ones. In this paper, we introduce Cross Similarity Attention (CSA) to mine richer intrinsic information from image pairs, overcoming a limitation when the Scaled Dot-Product of ViT is directly applied calculate similarity between two different images. Based on CSA, simultaneously minimize intra-class differences and maximize inter-class at fine-grained feature...

LiDAR inertial odometry (LIO) has attracted much attention due to the complementarity of and IMU measurements. In distribution-based LIO, components related distribution covariance in residual uncertainty from measurement noise is neutralized. And resultant point cloud constraint degeneration problem severely affects accuracy pose estimation. this article, a hierarchical tightly-coupled LIO based on proposed. By excluding eigenvalue elements component with designed loss function,...

Simultaneous localization and mapping is an indispensable yet challenging direction for mobile robots. Attracted by 3D LiDAR with accurate depth information robustness to illumination variations, many SLAM methods based on scan-to-map matching have been developed. However, there a critical issue of existing approaches, where large dense map generally required achieve satisfactory accuracy, leading low efficiency matching. To solve this problem, in letter, we propose novel directed geometry...

LiDAR odometry (LO) has gained popularity in recent years due to accurate depth measurement and robustness illumination. Typically, the solutions based on scan-to-map matching mainly optimize current pose. To further reduce accumulated error of pose estimation, fixed-lag smoothing that optimizes fixed-size poses simultaneously by corresponding point features multiple frames becomes necessary. The integration with LO still needs exploration. In this paper, a general module is proposed, which...

In order to overcome the drawbacks of conventional absorbents, which exhibit slow absorption rates and low loads, this study suggests enhancing absorbent system for CO2 by incorporating a nonaqueous solvent into 1,3-propanediamine (DAP) tetramethylethylenediamine (TMEDA), resulting in two-phase system. The mechanism was investigated using nuclear magnetic resonance (NMR) carbon spectroscopy. By comparing load, fraction ratio, viscosity different absorbents after absorbing dioxide, with good...

Desalination represents an effective method for alleviating water scarcity, applying algorithmic techniques to predict the performance of reverse osmosis (RO) desalination plants, Modified Grey Wolf Optimizer (MGWO) based Artificial Neural Networks (ANN) can membrane distillation (MD) equipment. Four experimental inputs are selected: feed salt concentration(35-140 g/h), flow rate(400-600 L/h), evaporator inlet temperature (60-80℃), and condenser (20-30℃). The permeate flux (L/h m2) is...

A new 2D fluorescent organic-metal chalcogenide (OMC), CdClHT (HT = 4-hydroxythiophenol), evenly covered with phenol groups is reported. represents unparalleled selectivity and the highest sensitivity towards 2,4,6-trinitrophenol (TNP) (KSV 2.16 × 107 m-1, experimental LOD 2 nM), among all reported conjugated polymer (CP) luminescent detectors.

Localization is a fundamental prerequisite, no matter whether single robot or multirobot system, where light detection and ranging (LiDAR) odometry has attracted great interest with accurate depth information robustness to illumination variations. In this article, novel 3-D LiDAR approach based on sparse geometric proposed. Different from map-based methods point features, we concern significant line plane features eigenvalues of neighboring points. Furthermore, line-to-line plane-to-plane...

In order to promote energy efficiency, reverse osmosis (RO) systems are equipped with recovery devices (ERDs), which mostly work under stable inflow conditions. However, the inlet salinity in estuarine area fluctuates seasons and river discharge. Traditional processes choose add number of high-pressure (HP) pumps fit this situation, brings problems high capital cost, complex operation, low device utilization. To overcome these drawbacks, an improved design turbine ERD was proposed paper...

Imperfect trench installation (ITI) is an effective technique to reduce the vertical earth pressure (VEP) acting on top of a box culvert. Several analytical methods can be found in literature, but few have considered friction between culvert sidewall and adjacent backfill. In this study, soil–culvert interaction model proposed consider sidewall. The performance ITI investigated by tests numerical simulations. addition, new simplified theoretical method deduced calculate VEP culvert,...

The effect of the design and process parameters a particle-classification zone on sizing precision plate differential mobility analyzer (PDMA) was investigated by simulation software in this work. consisted length, width, height classification zone, could lead to deviation an uneven classification-zone wall. Prior investigating parameters, comparison between experimental voltages PDMA results applied validate model. Thanks velocity-field particle-trajectory simulations, as well data from...

Marine environment provides a basic space for human survival and social sustainable development. The study of tribological problems mechanism marine engineering materials in the sea extreme has become one key technologies to be developed urgently field engineering. This review summarizes analyzes research friction environment, focuses on properties ceramic, polymer metal, emphatically introduces current situation development trend such as metal pairs, ceramics polymers ceramic aims provide...

A novel upsetting method, called Cone End Billet Upsetting (CEBU), is proposed in this paper to control bulging during the of large height-to-diameter ratio (LHDR) billets. This new method mainly characterized by prefabricating a conical shape at billet end, which aims reduce friction effect between end and anvil. In order validate CEBU, metal flow characteristics LHDR billets with traditional (TU) CEBU were analyzed compared finite element method. Experiments also carried out examine...

LiDAR odometry has gained popularity due to accurate depth measurement with the robustness illuminations. However, existing distribution-based methods do not sufficiently exploit information from source point cloud, which affects performance. In this paper, a novel distribution-to-distribution matching method is proposed based on maximum likelihood estimation solve relative transformation, where and target sets are tightly jointed represent sampling distribution in objective function. On...

On facial expression datasets with complex and numerous feature types, where the significance dominance of labeled features are difficult to predict, recognition(FER) encounters challenges inter-class similarity intra-class variances, making it mine effective features. We aim solely leverage among samples address this. introduce Cross Similarity Attention (CSA), an input-output position-sensitive attention mechanism that harnesses across different images compute corresponding global spatial...

The unidirectional single torsion process of commercially pure copper was followed by different number reverse turns deformation. effect strain on the material refinement and hardening investigated. It is found that grain significantly blocked in comparison with only suffered monotonic strain. strengthening slightly decreases torsional direction change. This phenomenon interpreted terms average dislocation density. A qualitative assumption proposed to explain retarded process. maybe improves...