Contour Of Mass Research Articles

Design and application of coal gangue sorting system based on deep learning

With the advancement of science and technology, coal-washing plants are transitioning to intelligent, information-based, and professional sorting systems. This shift accelerates the construction a modern economic system characterized by green and low-carbon development, thereby promoting the high-quality advancement of the coal industry. Traditional manual gangue picking and multi-axis robotic arm gangue selection currently suffer from low recognition accuracy, slow sorting efficiency, and high worker labor intensity. This paper proposes a deep learning-based, non-contact gangue recognition and pneumatic intelligent sorting system. The system constructs a dynamic database containing key feature information such as the target gangue's contour, quality, and center of mass. The system elucidates the relationships between ejection speed, mass, volume, angle of incidence, and the impact energy matching mechanism. Demonstration experiments using the system prototype for coal gangue sorting reveal that, compared to existing robotic arm sorting methods in coal washing plants, this system achieves a gangue identification accuracy exceeding 97%, a sorting rate above 91%, and a separation time of less than 3 s from identification to separation, thereby effectively enhancing raw coal purity.

Defining the out-of-limit state of the rocks in the vicinity of the working contour

The problem of defining the stress-strain state of a rock mass near the working contour is solved by the Cauchy stress vector and the displacement vector set on it. To do this, you also need to know the elastic properties and the passport curve of the material “tangent stress – shift” with a section of extreme deformation. The information obtained in solving the problem allows us to judge the condition and remaining reserve of strength of the material both on the contour of the rock mass itself and in its vicinity.

Breast masses in mammography classification with local contour features

BackgroundMammography is one of the most popular tools for early detection of breast cancer. Contour of breast mass in mammography is very important information to distinguish benign and malignant mass. Contour of benign mass is smooth and round or oval, while malignant mass has irregular shape and spiculated contour. Several studies have shown that 1D signature translated from 2D contour can describe the contour features well.MethodsIn this paper, we propose a new method to translate 2D contour of breast mass in mammography into 1D signature. The method can describe not only the contour features but also the regularity of breast mass. Then we segment the whole 1D signature into different subsections. We extract four local features including a new contour descriptor from the subsections. The new contour descriptor is root mean square (RMS) slope. It can describe the roughness of the contour. KNN, SVM and ANN classifier are used to classify benign breast mass and malignant mass.ResultsThe proposed method is tested on a set with 323 contours including 143 benign masses and 180 malignant ones from digital database of screening mammography (DDSM). The best accuracy of classification is 99.66% using the feature of root mean square slope with SVM classifier.ConclusionThe performance of the proposed method is better than traditional method. In addition, RMS slope is an effective feature comparable to most of the existing features.

Case 190: Papillary Fibroelastoma of the Pulmonary Valve

Transesophageal echocardiography revealed a 1-cm mobile round mass attached to the posterior leaflet of the pulmonary valve (Fig 1). During systole, the entire mass prolapsed into the main pulmonary trunk. There was also an accompanying mild (grade 1 of 4) pulmonary regurgitation. Most of the lesion was hyperechoic, but a few echolucencies were suspected within the mass. In addition, a three-dimensional transesophageal echocardiographic examination was performed (Fig 2; Movie 1 [online]). These images show even bet ter the prolapse during systole in the right ventricular outflow tract and the slightly irregular contour of the small mass. For further evaluation of the tissue characteristics of the mass, cardiac MR imaging was performed. Figures 3 and 4 show a 1.0 3 0.7 cm soft-tissue mass attached to the ventricular side of History A 64-year-old male nonsmoker with a history of hypertension and morbus Meniere (Meniere disease) who had undergone a previous appendectomy presented with fatigue and bradycardia. Laboratory tests did not reveal any relevant abnormalities. At physical examination, normal breath sounds and no heart murmurs were heard. Chest radiography demonstrated a normal cardiac silhouette and clear lung fields. Electrocardiography showed sinus rhythm with a normal axis. The indication for transthoracic echocardiography was evaluation of bradycardia of unknown origin. Because of the suggestion of a structure closely related to the pulmonary valve, transesophageal echocardiography was performed. For further tissue characterization, cardiac magnetic resonance (MR) imaging also was performed, and the resultant images are shown.

Automatic mass segmentation on mammograms combining random walks and active contour

Accurate mass segmentation on mammograms is a critical step in computer-aided diagnosis (CAD) systems. It is also a challenging task since some of the mass lesions are embedded in normal tissues and possess poor contrast or ambiguous margins. Besides, the shapes and densities of masses in mammograms are various. In this paper, a hybrid method combining a random walks algorithm and Chan-Vese (CV) active contour is proposed for automatic mass segmentation on mammograms. The data set used in this study consists of 1095 mass regions of interest (ROIs). First, the original ROI is preprocessed to suppress noise and surrounding tissues. Based on the preprocessed ROI, a set of seed points is generated for initial random walks segmentation. Afterward, an initial contour of mass and two probability matrices are produced by the initial random walks segmentation. These two probability matrices are used to modify the energy function of the CV model for prevention of contour leaking. Lastly, the final segmentation result is derived by the modified CV model, during which the probability matrices are updated by inserting several rounds of random walks. The proposed method is tested and compared with other four methods. The segmentation results are evaluated based on four evaluation metrics. Experimental results indicate that the proposed method produces more accurate mass segmentation results than the other four methods.

Acute Suppurative Adenoiditis

Sir.—A case of isolated adenoiditis prompted a search of the literature for the condition. The results of the search were startling due to the virtual absence of characterization of what should be a distinctive, and not unusual, clinical entity. Patient Report.—A previously healthy 9-year-old girl presented with fever, rhinorrhea, pharyngeal pain, and hyponasal speech of 2 days' duration. She reportedly had had a tonsillectomy and adenoidectomy 3 years earlier for recurrent adenotonsillitis. Abnormalities on physical examination were limited to fever (temperature, 40°C), serous rhinorrhea that prompted nearly constant sniffling, total occlusion of the posterior nasal airway, and an exudative fullness just visible in the superior pharynx behind the uvula. Mild posterior cervical adenopathy was also present. A lateral soft-tissue roentgenogram of the head and neck was obtained (Figure). The postero-superior location and contour of the naso-pharyngeal mass seen on the roentgenogram suggested adenoid hypertrophy. Flexible fiberoptic nasopharyngoscopy revealed

Keyhole Tenodesis of Biceps Origin at the Shoulder

A simple but efficient way to secure the biceps tendon after it has been detached at its upper end by either trauma, attrition or surgical interference is the use of the keyhole in the upper humerus. A tied or rolled knot of tendon inserted into a keyhole shaped opening in the bicipital groove permits firm attachment of the tendon to bone permitting immediate shoulder and elbow motion. Immediate postoperative joint motion avoids aggravation of coexisting shoulder disease and permits early return to work or sports. Use of this procedure in 11 patients with good to excellent results in all confirns its merit.

An Inquiry into the Causes of Breech Presentation

Summary Two aspects of the etiology of breech presentation have been considered. First, it has-been found that the “classical factors” (contracted pelvis, pelvic tumors, placenta previa, and fetal malformation) in the aggregate account for only one-sixth of the breech births among mature single infants. Second, the data which have been assembler) suggest that extension of the legs may be a causative factor rather than a resultant effect in breech presentations. The mechanism by which extension of the legs may operate to affect the presentation has not been fully discussed here. It is the writer's hope that within a few years he will be prepared to report current experiments which deal with the effects of gravity and of the contour of the fetal mass upon polarity. At, that time, a review and correlation will be made of many important fundamental publications which have not been alluded to in the present study.