# learn words by step4

英语词汇精讲
最新推荐文章于 2025-07-10 18:03:53 发布
原创 最新推荐文章于 2025-07-10 18:03:53 发布 · 247 阅读 · 0 ·
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本博客深入探讨了一系列英语词汇，包括其含义、用法及相关的派生词，如adventure（奇遇）、adventurous（大胆的）、venture（企业），以及allow（允许）、allowance（津贴）等，旨在帮助读者拓宽词汇量，提升英语水平。

adventure n.奇遇
adventurous a.大胆的;充满新鲜事物的
venture n.企业vi.冒险vt.敢于

allow vt.允许;同意给;承认
allowance n.津贴

avoid
void n.真空，空虚 vt.使之无效 a.缺乏的,无效的
devoid a缺乏的

rally v.集合;恢复健康n.集会;公路汽车赛
alloy n.合金 v.将…铸成合金

apply vi.申请vt.应用;涂
appliance n.电器

attack v.攻击n.发作
tack n.大头钉;方针vt.钉住;附加

batch n.一批;一批生产的量

ball
ballot 选票，投票表决

embarrass vt.使窘迫
barrister n.大律师(让别人尴尬的人)

recycle v.回收利用
recyclable a.可循环使用的
cyclone n.旋风

encyclop(a)edia n.百科全书
cylinder n.圆柱体;汽缸

circulate v.(使)循环;传播
circulation n.流通; 发行量;循环
circumstance n.条件;境况

bite v.咬n.咬伤;咬下的一口
bait n.诱饵;诱惑物vt.装饵于;故意激怒
biting a.刺骨的
bitter a.充满仇恨的;使人悲痛的;严寒的;味苦的

blind a.瞎的;视而不见的;盲目的vt.使失明;使失去判断力n.窗帘
blend v.融合n.混合物
blunder vi.跌跌撞撞地走;犯愚蠢的错误n.愚蠢的错误

bracket1 n.括号vt.用括号括上
brace1 n.大括号
bracelet2 n.手镯
embrace v./n.拥抱;欣然接受
bracket n.支架;等级vt.把…等同考虑

bed n.床，河床；花坛 v.把……固定在
embed vt.把……嵌入；使之深留脑中

hencebefore ad.从此以后

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caution precaution n.预防，预防措施 obsess obsessive adj.迷恋的 n.强迫症患者 grant granted adv.的确 conj.假定 Granted,it’s not a pleasant job. super superiority n.优越性，优势，傲慢 toll trolley 电车，手推车，台车 troll(GRE) 滚动，轮唱，钓鱼 hold uphold vt.支撑，支持 holdup 停顿，抢劫 withhold 拒绝，抑制 home do
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Introduction Gas metal arc welding (GMAW), also known as metal inert gas (MIG) welding, is a widely used industrial process that involves the transfer of metal droplets from a consumable electrode wire to a workpiece through a welding arc. In this process, the welding operator controls various welding parameters, such as welding current, voltage, wire feed speed, and electrode polarity, to achieve the desired weld bead geometry and properties. The metal transfer mechanism plays a critical role in determining the weld quality and productivity in GMAW. Therefore, there has been significant interest in developing automated methods for analyzing the metal transfer images and extracting useful information about the process. In recent years, deep learning has emerged as a powerful technique for analyzing and processing images. Convolutional neural networks (CNNs) are a type of deep learning model that can learn features from images in an end-to-end manner, without requiring explicit feature engineering. In this paper, we present a deep-learning based approach for analyzing metal transfer images in GMAW. We first discuss the dataset used in this study, followed by a detailed description of the proposed method. We then present the experimental results and discuss the implications of our findings. Dataset The metal transfer images were captured using a high-speed camera at a frame rate of 20,000 frames per second. The camera was positioned perpendicular to the welding direction and had a resolution of 1280 × 1024 pixels. The images were captured during the welding of mild steel plates using a GMAW process with a 1.2 mm diameter wire. The welding current, voltage, and wire feed speed were varied to obtain a range of metal transfer modes, including short-circuiting, globular, and spray transfer modes. The dataset consists of 10,000 metal transfer images, with each image labeled with the corresponding metal transfer mode. Proposed method The proposed method for analyzing metal transfer images in GMAW consists of the following steps: 1. Image preprocessing: The metal transfer images are preprocessed to remove any noise and artifacts. A Gaussian filter is applied to smooth the images, followed by a contrast enhancement step using histogram equalization. 2. Feature extraction: A CNN is used to extract features from the preprocessed images. The CNN architecture used in this study is based on the VGG-16 model, which has shown excellent performance in image classification tasks. The VGG-16 model consists of 13 convolutional layers and 3 fully connected layers. The output of the last convolutional layer is used as the feature vector for each image. 3. Classification: The feature vectors extracted from the metal transfer images are used to train a multiclass classification model. In this study, we used a support vector machine (SVM) classifier with a radial basis function (RBF) kernel. The SVM classifier was trained on 80% of the dataset and tested on the remaining 20%. Experimental results The proposed method was evaluated on the dataset of 10,000 metal transfer images. The classification accuracy achieved by the SVM classifier was 96.7%, indicating that the method can accurately classify the metal transfer modes in GMAW. To further validate the performance of the method, we compared it with two other classification models: a decision tree classifier and a random forest classifier. The decision tree classifier achieved an accuracy of 85.2%, while the random forest classifier achieved an accuracy of 94.5%. These results demonstrate that the proposed method outperforms these traditional machine learning models. To further analyze the performance of the method, we conducted a sensitivity analysis by varying the number of convolutional layers in the CNN. We found that the performance of the method improved with increasing number of convolutional layers, up to a certain point, after which there was no significant improvement
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