Journal articles on the topic 'Inverted Residual'
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Zhang, Feng, Xiaoyan Qian, Lei Han, and Yi Shen. "Inverted Residual Siamese Visual Tracking With Feature Crossing Network." IEEE Access 9 (2021): 27158–66. http://dx.doi.org/10.1109/access.2021.3056194.
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GIAMPAOLO, S. M., F. ILLUMINATI, A. DI LISI, and G. MAZZARELLA. "MASSIVE QUANTUM MEMORIES BY PERIODICALLY INVERTED DYNAMIC EVOLUTIONS." International Journal of Quantum Information 04, no. 03 (June 2006): 507–17. http://dx.doi.org/10.1142/s0219749906001955.
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We introduce a general scheme to realize perfect quantum state reconstruction and storage in systems of interacting qubits. This novel approach is based on the idea of controlling the residual interactions by suitable external controls that, acting on the inter-qubit couplings, yield time-periodic inversions in the dynamical evolution, thus cancelling exactly the effects of quantum state diffusion. We illustrate the method for spin systems on closed rings with XY residual interactions, showing that it enables the massive storage of arbitrarily large numbers of local states, and we demonstrate its robustness against several realistic sources of noise and imperfections.
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Kaneko, Hiroshi, Hiroshi Kitoh, Akiko Kitamura, Kenta Sawamura, and Tadashi Hattori. "Docking phenomenon and subsequent acetabular development after gradual reduction using overhead traction for developmental dysplasia of the hip over six months of age." Journal of Children's Orthopaedics 15, no. 6 (December 1, 2021): 554–63. http://dx.doi.org/10.1302/1863-2548.15.210143.
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Purpose This study aimed to explore the docking of the femoral head into the acetabulum after gradual reduction (GR) using traction for developmental dysplasia of the hip (DDH) and the impact on subsequent acetabular development. Methods A total of 40 patients with DDH (42 hips) undergoing GR using overhead traction and spica casting were retrospectively reviewed. The presence of inverted labrum and the coronal and axial femoral-acetabular distances (FADs) were compared between MRI immediately and five weeks after spica casting. The change in the acetabular index on anteroposterior pelvic radiographs were compared between hips with inverted labrum (residual group) and with normally-shaped labrum (normalized group) on follow-up MRI. Results The mean age at reduction was 13.1 months (7 to 33) and the mean follow-up duration was 7.7 years (4 to 11). The rate of inverted labrum and the FADs significantly decreased between the MRI scans (all p-values < 0.001), and previous Pavlik harness failure had no negative effect on these decreases. The acetabular indices at the ages of three and five years in the residual group were significantly larger than those in the normalized group (both p-values < 0.001). Residual acetabular dysplasia was seen in 84.2% of the residual group compared with 34.8% of the normalized group (p = 0.002). Conclusion The docking phenomenon can occur during spica casting following GR using traction in children with DDH between the ages of six months and three years. The remaining inverted labrum at the cast removal may negatively affect subsequent acetabular development. Level of evidence III - retrospective comparative study
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Zhang, Tianyu, Cuiping Shi, Diling Liao, and Liguo Wang. "Deep Spectral Spatial Inverted Residual Network for Hyperspectral Image Classification." Remote Sensing 13, no. 21 (November 7, 2021): 4472. http://dx.doi.org/10.3390/rs13214472.
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Convolutional neural networks (CNNs) have been widely used in hyperspectral image classification in recent years. The training of CNNs relies on a large amount of labeled sample data. However, the number of labeled samples of hyperspectral data is relatively small. Moreover, for hyperspectral images, fully extracting spectral and spatial feature information is the key to achieve high classification performance. To solve the above issues, a deep spectral spatial inverted residuals network (DSSIRNet) is proposed. In this network, a data block random erasing strategy is introduced to alleviate the problem of limited labeled samples by data augmentation of small spatial blocks. In addition, a deep inverted residuals (DIR) module for spectral spatial feature extraction is proposed, which locks the effective features of each layer while avoiding network degradation. Furthermore, a global 3D attention module is proposed, which can realize the fine extraction of spectral and spatial global context information under the condition of the same number of input and output feature maps. Experiments are carried out on four commonly used hyperspectral datasets. A large number of experimental results show that compared with some state-of-the-art classification methods, the proposed method can provide higher classification accuracy for hyperspectral images.
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Ade, Ogunde Adebisi, Oseghale Osezuwa Innocent, Olayode Fatoki, and Laoye Victoria Eshomomoh. "Modified Extended Inverted Weibull Distribution with Application to Neck Cancer Data." Journal of Mathematics Research 14, no. 2 (March 24, 2022): 39. http://dx.doi.org/10.5539/jmr.v14n2p39.
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This work introduces a new three-parameter modified extended inverted Weibull (MEIW) distribution which is a hybrid of the one-parameter inverted Weibull distribution. The density function of the MEIW can be expressed as a linear combination of the inverted Weibull densities. Some mathematical properties of the proposed MEIW model such as ordinary and incomplete moments, mean residual life, and mean waiting time, Tsallis entropy, moment generating function and order statistics are investigated. The maximum likelihood estimation method is considered to estimate the parameters of the MEIW model. The relevance of the MEIW model is studied via an application to neck cancer data.
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Wang, Zhikai, Satish C. Singh, and Mark Noble. "True-amplitude versus trace-normalized full waveform inversion." Geophysical Journal International 220, no. 2 (November 26, 2019): 1421–35. http://dx.doi.org/10.1093/gji/ggz532.
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SUMMARY Full waveform inversion (FWI) is a powerful method to estimate high-resolution physical parameters of the subsurface by iteratively minimizing the misfit between the observed and synthetic seismic data. Standard FWI algorithms measure seismic misfit between amplitude-preserved seismic data (true-amplitude FWI). However, in order to mitigate the variations in sources and recording systems acquired on complex geological structures and the physics that cannot be modelled using an approximation of the seismic wave equation, the observed and synthetic seismic data are normalized trace-by-trace and then used to perform FWI. Trace-by-trace normalization removes the amplitude effects related to offset variations and only keeps the phase information. Furthermore, trace-by-trace normalization changes the true amplitude difference because of different normalization factors used for the corresponding synthetic and observed traces. In this paper, we study the performance of true-amplitude FWI and trace-normalized-residual-based FWI in the time domain. The misfit function of trace-normalized-residual-based FWI is defined such that the adjoint source used in gradient calculation is the trace-normalized seismic residual. We compare the two inversion schemes with synthetic seismic data simulated on laterally invariant models and the more complex 2-D Marmousi model. In order to simulate realistic scenarios, we perform the elastic FWI ignoring attenuation to noisy seismic data and to the synthetic data modelled using a viscoelastic modelling scheme. Comparisons of seismic data and adjoint sources show that trace-by-trace normalization increases the magnitude of seismic data at far offsets, which are usually more cycle-skipped than those at near offsets. The inverted results on linear-gradient models demonstrate that trace-by-trace normalization increases the non-linearity of FWI, so an initial model with sufficient accuracy is required to guarantee the convergence to the global minimum. The inverted results and the final seismic residuals computed using seismic data without trace-by-trace normalization demonstrate that true-amplitude FWI provides inverted models with higher accuracy than trace-normalized-residual-based FWI, even when the unknown density is updated using density–velocity relationship in inversion or in the presence of noise and complex physics, such as attenuation.
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Yavuz Solmaz, Murat. "Residual Stress Analysis of Steel Fibre Reinforced Composite Inverted-Tooth Chains." Materials Testing 54, no. 10 (October 2012): 694–99. http://dx.doi.org/10.3139/120.110381.
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Liu Wanjun, 刘万军, 高明月 Gao Mingyue, 曲海成 Qu Haicheng, and 刘腊梅 Liu Lamei. "Light-Weight Multi-Object Detection Network Based on Inverted Residual Structure." Laser & Optoelectronics Progress 56, no. 22 (2019): 221003. http://dx.doi.org/10.3788/lop56.221003.
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Basavannaiah, Sphoorthi. "Tricky nasal mass from meek polyp to intricate papilloma: A diagnostic dilemma." IP Journal of Otorhinolaryngology and Allied Science 4, no. 3 (November 15, 2021): 115–18. http://dx.doi.org/10.18231/j.ijoas.2021.022.
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Inverted papilloma is a benign epithelial growth arising from the underlying stroma of the nasal cavity and paranasal sinuses. The pathogenesis of this lesion uptil date remains unclear. The tumor is known for its local invasiveness, rapid recurrence and link with malignancy. The recurrence rate of this tumor is usually too high that represents residual disease in most of the cases. Hence, it is mandate that the patient keeps a proper follow up on long term concerns. Here is one such patient, whose nasal mass seemed Antrochoanal polyp clinically but ended up as Inverted papilloma histopathologically.
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Chaudhary, Arun Kumar, and Laxmi Prasad Sapkota. "New modified Inverted Weibull Distribution: Properties and Applications to COVID-19 Dataset of Nepal." Pravaha 27, no. 1 (December 31, 2021): 1–12. http://dx.doi.org/10.3126/pravaha.v27i1.50603.
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We have developed a four parameters new modified inverted Weibull distribution and we named it exponentiated exponential inverted Weibull distribution. Linear representation of probability density function, reliability function, hazard function, moments about the origin and its generating function, mean residual life function, order statistics, two entropies namely Renyi and q-Entropy, and mean deviation for the proposed distribution are presented. For the parameter estimation the maximum likelihood, least-square, and Cramer-Von-Mises estimation methods are used. The application of the proposed distribution is analyzed using the deaths case of the COVID-19 dataset of Nepal from 1st April to 14th May 2021.
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Yu, Jimin, Guangyu Zhou, Shangbo Zhou, and Jiajun Yin. "A Lightweight Fully Convolutional Neural Network for SAR Automatic Target Recognition." Remote Sensing 13, no. 15 (August 2, 2021): 3029. http://dx.doi.org/10.3390/rs13153029.
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Automatic target recognition (ATR) in synthetic aperture radar (SAR) images has been widely used in civilian and military fields. Traditional model-based methods and template matching methods do not work well under extended operating conditions (EOCs), such as depression angle variant, configuration variant, and noise corruption. To improve the recognition performance, methods based on convolutional neural networks (CNN) have been introduced to solve such problems and have shown outstanding performance. However, most of these methods rely on continuously increasing the width and depth of networks. This adds a large number of parameters and computational overhead, which is not conducive to deployment on edge devices. To solve these problems, a novel lightweight fully convolutional neural network based on Channel-Attention mechanism, Channel-Shuffle mechanism, and Inverted-Residual block, namely the ASIR-Net, is proposed in this paper. Specifically, we deploy Inverted-Residual blocks to extract features in high-dimensional space with fewer parameters and design a Channel-Attention mechanism to distribute different weights to different channels. Then, in order to increase the exchange of information between channels, we introduce the Channel-Shuffle mechanism into the Inverted-Residual block. Finally, to alleviate the matter of the scarcity of SAR images and strengthen the generalization performance of the network, four approaches of data augmentation are proposed. The effect and generalization performance of the proposed ASIR-Net have been proved by a lot of experiments under both SOC and EOCs on the MSTAR dataset. The experimental results indicate that ASIR-Net achieves higher recognition accuracy rates under both SOC and EOCs, which is better than the existing excellent ATR methods.
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D'Arrigo, Giuseppe, Andrea Severino, G. Milazzo, Corrado Bongiorno, Nicolò Piluso, Giuseppe Abbondanza, Marco Mauceri, Giuseppe Condorelli, and Francesco La Via. "3C-SiC Heteroepitaxial Growth on Inverted Silicon Pyramids (ISP)." Materials Science Forum 645-648 (April 2010): 135–38. http://dx.doi.org/10.4028/www.scientific.net/msf.645-648.135.
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3C-SiC devices are hampered by the defect density in heteroepitaxial films. Acting on the substrate, it is possible to achieve a better compliance between Si and 3C-SiC. We present here an approach to favorite defect geometrical reduction in both [ ] and [ ] directions by creating Inverted Silicon Pyramids (ISP). A study of 3C-SiC growth on ISP is reported showing benefits in the film quality and a reduction in the linear density of stacking faults. Growth on ISP leads also to a decrease in the 3C-SiC residual stress as well as in the bow of the Si/SiC system.
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Zhou, Liming, Yahui Li, Xiaohan Rao, Cheng Liu, Xianyu Zuo, and Yang Liu. "Ship Target Detection in Optical Remote Sensing Images Based on Multiscale Feature Enhancement." Computational Intelligence and Neuroscience 2022 (October 6, 2022): 1–20. http://dx.doi.org/10.1155/2022/2605140.
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Due to the multiscale characteristics of ship targets in ORSIs (optical remote sensing images), ship target detection in ORSIs based on depth learning is still facing great challenges. Aiming at the low accuracy of multiscale ship target detection in ORSIs, this paper proposes a ship target detection algorithm based on multiscale feature enhancement based on YOLO v4. Firstly, an improved mixed convolution is introduced into the IRes (inverted residual block) to form an MIRes (mixed inverted residual block). The MIRes are used to replace the Res (residual block) in the deep CSP module of the backbone network to enhance the multiscale feature extraction capability of the backbone network. Secondly, for different scale feature maps’ perception fields, feature information, and the scale of the detected objects, the multiscale feature enhancement modules—SFEM (small scale feature enhancement module) and MFEM (middle scale feature enhancement module)—are proposed to enhance the feature information of the middle- and low-level feature maps, respectively, and then the enhanced feature maps are sent to the detection head for detection. Finally, experiments were implemented on the LEVIR-ship dataset and the NWPU VHR-10 dataset. The accuracy of the proposed algorithm in ship target detection reached 79.55% and 90.70%, respectively, which is improved by 3.25% and 3.56% compared with YOLO v4.
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Weng, Z., R. J. Patton, and P. Cui. "Active fault-tolerant control of a double inverted pendulum." Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering 221, no. 6 (September 1, 2007): 895–904. http://dx.doi.org/10.1243/09596518jsce367.
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This paper proposes an active fault-tolerant control scheme based on a gain-scheduled H∞ design strategy. Under the assumption that the effects of faults on the system can be of affine parameter dependence, a reconfigurable robust H∞ controller is developed. The resulting controller is a function of the fault effect factors, which can be derived online from the residual vector of the fault detection and isolation (FDI) mechanism. To demonstrate the effectiveness of the proposed method, a non-linear double inverted pendulum system with a fault in the motor tachometer loop is considered. The adaptive fault-tolerant controller recovers well from the unstable system with loop failure.
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Wang, Yiping, and Tong Wang. "Numerical Simulation of a Heavy Rainstorm in Northeast China Caused by the Residual Vortex of Typhoon 1909 (Lekima)." Atmosphere 12, no. 1 (January 16, 2021): 120. http://dx.doi.org/10.3390/atmos12010120.
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From 14 to 17 August 2019, a heavy rainstorm occurred in Northeast China due to the combined influence of the residual vortex of typhoon 1909 (Lekima) and cold air intrusion. Based on the precipitation data of China Meteorological observation stations, surface and upper charts, HMW-8 satellite images, NCEP/NCAR 0.25° × 0.25° reanalysis data and WRF4.0 numerical prediction model are used to carry out numerical simulations. According to the weather situation and numerical simulation results, the cause of 1 h severe precipitation is thoroughly studied. Results show that: (1) According to the weather situation, the precipitation process can be divided into two stages. The first stage is from 1412 to 1612 August 2019, which is caused by the interaction between the residual vortex, the inverted trough of typhoon 1909 (Lekima) and the upper trough. The rain belt lies from northeast to southwest, and the rainfall center has typical meso-β-scale characteristics. At the second stage from 1612 to 1712 August 2019, the residual vortex of typhoon reaches Heilongjiang Province, at the same time, 500 hPa cold vortex falls to the south; (2) Based on the 1 h rainfall of automatic weather stations, it can be seen that there are three rainfall peaks from 00 UTC 14 to 12 UTC 17, which are 53.2 mm in the Middle East of Jilin Province, 38.2 mm in the south of 1610 Liaoning Province, and 21.3 mm in the east of 1707 Heilongjiang Province respectively. (3) Before the occurrence of 1 h heavy rainfall, the water vapor is concentrated in the middle and lower troposphere. The residual vortex trough of typhoon 1909 extends northward, converges with the southwest airflow at the edge of the subtropical high, and transports water vapor and energy to the northeast. The convective cloud clusters generated ahead of the trough move southeast, then merge into the mesoscale convective system in the inverted trough; (4) In the Bohai Bay and North Korea, there is a vortex-like zone composed of several convergence centers, and the convergence zone in typhoon-inverted trough meets with the trough in Central Jilin. There exist a rising area and a positive vorticity belt in the typhoon-inverted trough, and the center of heavy rain lies in front of the positive vorticity center. At the west of the inverted trough, there is a large center of positive vertical wind shear, and a small center in the east. The center of heavy rainfall is located on the line between the maximum and minimum centers, which is close to the right of the maximum center; (5) The high energy tongue is transported from the center of the typhoon to the northeast along the inverted trough of the typhoon, and the southwest airflow at the edge of the subtropical high. There is a zone titled downward from northwest to southeast that contains dry and cold air, where there is convective instability; (6) The strong precipitation area is located on the lee in the northwest of Changbai Mountain. There is a convergence area in the middle of the troposphere, and a strong divergence area in the upper troposphere, with remarkable topographic effect, and the west divergence column inclines on the east convergence column.
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Lozovan, A. A., A. S. Lenkovets, N. A. Ivanov, and T. S. Sukhova. "Research of the influence of bias voltage on the structure and residual stress in Ta/W coatings applied on a copper substrate by inverted magnetron." Journal of Physics: Conference Series 2144, no. 1 (December 1, 2021): 012012. http://dx.doi.org/10.1088/1742-6596/2144/1/012012.
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Abstract This paper presents the results of studying the effect of the bias voltage on a copper tube substrate on the texture and residual stresses in 4-layer Ta/W/Ta/W coatings deposited with an inverted magnetron. It is shown that, in contrast to monolayer coatings of Ta and W, in which residual stresses exceeding 2 GPa are formed on the substrate at high voltages on the substrate, stress relaxations occur in the 4-layer coating in alternating layers differing in LTEC values and in the outer W-layer of stress practically absent.
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Kim, Sung Joon, Jae Jung Lee, Ik Soo Byon, Ji Eun Lee, and Sung Who Park. "Exhibiting Residual Subretinal Fluid after High Myopic Macular Hole Retinal Detachment Surgery." Journal of the Korean Ophthalmological Society 62, no. 12 (December 15, 2021): 1672–78. http://dx.doi.org/10.3341/jkos.2021.62.12.1672.
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Purpose: To report a case of poor visual prognosis complicated by residual subretinal fluid after use of the internal limiting membrane flap technique to treat macular hole retinal detachment in a patient with high myopia.Case summary: A 55-year-old male stated that he had experienced a transparent circle in the central visual field of the right eye for 1 month. His best-corrected visual acuity (BCVA) was 0.32 and the axial length of the right eye was 32.57 mm. Fundus examination revealed a macular hole with retinal detachment localized to the posterior pole. We performed vitrectomy, membrane peeling, internal limiting membrane peeling with inverted internal limiting membrane flap, and silicone oil injection. On day 1 after surgery, the macular hole was closed, but subretinal fluid was noticed in the macula. At 3 months after surgery, the BCVA was 0.16 and the silicone oil was removed. At 14 months after the first surgery, the subretinal fluid was completely absorbed, but leopard-pattern pigment degeneration became prominent and the macula exhibited ellipsoid zone disruption. The BCVA decreased to 0.1.Conclusions: In patients exhibiting macular hole retinal detachment in the context of high myopia, an inverted internal limiting membrane flap may increase the macular hole closure rate but disturb subretinal fluid drainage. As persistent subretinal fluid may cause permanent retinal damage with a poor visual prognosis, the surgical method must be carefully chosen.
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Zhao, Qi Chao, Wen Gang Ji, and Jian Dong Liu. "A Fuzzy Based Adaptive Dynamic Surface Control to Inverted Pendulum Control." Applied Mechanics and Materials 336-338 (July 2013): 856–63. http://dx.doi.org/10.4028/www.scientific.net/amm.336-338.856.
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This paper aims at exploring a fuzzy based adaptive dynamic surface control (DSC) for an inverted pendulum system that is mounted on a moveable cart. Incorporating DSC technique into fuzzy logic systems (FLSs), it is shown that the design procedure and the computational burden can be greatly reduced and the system tracking error converges to an arbitrary small residual set. The simulation results show the efficiency of the proposed scheme.
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Piechna, A., K. Cieślicki, L. Lombarski, and B. Ciszek. "Ex Vivo and in Silico Study of Human Common Carotid Arteries Pressure Response in Physiological and Inverted State." International Journal of Applied Mechanics and Engineering 20, no. 1 (February 1, 2015): 209–14. http://dx.doi.org/10.1515/ijame-2015-0015.
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Abstract Arterial walls are a multilayer structures with nonlinear material characteristics. Furthermore, residual stresses exist in unloaded state (zero-pressure condition) and they affect arterial behavior. To investigate these phenomena a number of theoretical and numerical studies were performed, however no experimental validation was proposed and realized yet. We cannot get rid of residual stresses without damaging the arterial segment. In this paper we propose a novel experiment to validate a numerical model of artery with residual stresses. The inspiration for our study originates from experiments made by Dobrin on dogs’ arteries (1999). We applied the idea of turning the artery inside out. After such an operation the sequence of layer is reversed and the residual stresses are re-ordered. We performed several pressure-inflation tests on human Common Carotid Arteries (CCA) in normal and inverted configurations. The nonlinear responses of arterial behavior were obtained and compared to the numerical model. Computer simulations were carried out using the commercial software which applied the finite element method (FEM). Then, these results were discussed.
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Hemeda, Saeed E., and Ali M. Abdallah. "Sinh Inverted Exponential Distribution: Simulation & Application to Neck Cancer Disease." International Journal of Statistics and Probability 9, no. 5 (July 27, 2020): 11. http://dx.doi.org/10.5539/ijsp.v9n5p11.
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A goal of this research is providing new probability distribution called Sinh inverted exponential distribution. The new distribution was extensively depending on the hyperbolic sine family of distributions with exponential distribution as a baseline distribution. Valuable statistical properties of the proposed distribution including mathematical and asymptotic expressions for its probability density function and Reliability. Moments, quantiles, moment generating function, failure rate function, mean residual lifetime, order statistics and entropies are derived. Actually, the applicability and validation of this model is proved in simulation study and an application to neck cancer disease data.
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Wang, Zongsheng, Jiaqi Wang, and Ruxin Fan. "An Underwater Single Target Tracking Method Using SiamRPN++ Based on Inverted Residual Bottleneck Block." IEEE Access 9 (2021): 25148–57. http://dx.doi.org/10.1109/access.2021.3056105.
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Smith, W., D. Lowe, and P. Leong. "Resection of pyriform aperture: a useful adjunct in nasal surgery." Journal of Laryngology & Otology 123, no. 1 (October 15, 2008): 123–25. http://dx.doi.org/10.1017/s0022215108003794.
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AbstractObjective:The aim of this paper is to describe a novel technique of improving the nasal airflow in patients in whom, despite reduction surgery to the inferior turbinates (either alone or with septal surgery), the nasal airways remain compromised because of obstruction occurring anterior to the inferior turbinate, due to a prominent nasal process of the maxilla at the pyriform aperture.Method:We describe a novel approach to resection of the nasal process of the maxilla, a technique performed in 40 patients with either: residual obstructive symptoms following septal surgery with or without turbinate surgery; and significant inspiratory alar collapse. The same technique was also used in two patients to improve the intranasal approach to the medial and anterior maxilla during endoscopic medial maxillectomy for recurrent inverted papilloma.Results:Patients reported a subjective improvement in their nasal airways, with resolution of inspiratory alar collapse. This technique significantly improved intranasal access in the two patients with inverted papilloma.Conclusion:This technique confers significant subjective improvement of nasal airways patency in selected patients, and improves endoscopic surgical access to clear inverted papilloma.
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Cao, Hongmei, Jing Xie, Young Kim, and Hua-wei Zhou. "Multiscale migration tomography to constrain depth-imaging artifacts." GEOPHYSICS 73, no. 5 (September 2008): VE217—VE222. http://dx.doi.org/10.1190/1.2953088.
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Multiscale tomography (MST) can constrain depth-imaging artifacts that appear in the velocity field inverted using conventional single-scale tomography (SST). Depth-imaging artifacts are poorly constrained velocity results that cause defocusing and/or incorrect structures in the migrated stack. The quality of an inverted velocity distribution from a tomographic approach depends heavily on ray coverage. In areas of poor ray coverage with a small ray count or parallel rays, the velocity distribution can be nonunique because of the lack of constraints. In the case of large residual moveouts from prestack migration, which most likely could happen in the presence of a complex geologic setting, serious depth-imaging artifacts can appear in the velocity field inverted using SST. To solve this problem, we tested the ability of MST to constrain artifacts in a case study. MST parameterizes the study area into overlapping submodels of different grid sizes. The inverted velocity-perturbation value for a specific location is the superposition of velocity-perturbation values from those submodels. The submodel with a large grid size provides a stable regional value that helps constrain local artifacts from submodels of smaller grid sizes. Artifacts using SST are suppressed significantly by MST. Migrated stack and common-image gathers indicated improvements in the velocity field from MST compared with the initial velocity field and that from SST.
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Zhao, Wenlei, Zhijian Wang, Wenan Cai, Qianqian Zhang, Junyuan Wang, Wenhua Du, Ningning Yang, and Xinxin He. "Multiscale inverted residual convolutional neural network for intelligent diagnosis of bearings under variable load condition." Measurement 188 (January 2022): 110511. http://dx.doi.org/10.1016/j.measurement.2021.110511.
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IRINO, Masayuki, Kenichiro MATSUZAKI, Takahiro KONDOU, and Nobuyuki SOWA. "B-08 Residual Vibration Suppression in Motion Control of Inverted Pendulum by Subspace Control Method." Proceedings of Conference of Kyushu Branch 2016.69 (2016): 53–54. http://dx.doi.org/10.1299/jsmekyushu.2016.69.53.
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Song, Aiming, Qi Luo, Shui Wan, and Zhicong Li. "Experimental and Analytical Study on Deformation Behavior in Hogging Moment Regions of Composite Beams." Advances in Civil Engineering 2020 (December 30, 2020): 1–10. http://dx.doi.org/10.1155/2020/6630742.
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The results of an experimental and analytical study on the static and fatigue behavior in steel-concrete composite beams under the hogging moment were presented in this paper, and the structural deformation was discussed cautiously and emphatically. Firstly, the static and fatigue tests on three inverted simply supported beams were conducted. The development of cracks under static loading, the load-deformation curves, and the values of residual deformation under fatigue load were recorded and analyzed in detail. Several meaningful conclusions were obtained from the analysis of experimental results. To study the development laws of residual deformation under fatigue load, the analytical methods of residual midspan deflection and residual rebar strain were proposed, respectively. The limitation and accuracy of the presented models were studied according to the comparison between the prediction and measured results. The calculation values of the proposed models showed good agreement with the test results. Finally, the design recommendations of fatigue deformation were proposed according to the experimental and analytical study on steel-concrete composite beams subjected to hogging moment.
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Squires, Livia J., Samuel N. Blakeslee, and Paul L. Stoffa. "The effects of statics on tomographic velocity reconstructions." GEOPHYSICS 57, no. 2 (February 1992): 353–62. http://dx.doi.org/10.1190/1.1443249.
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Seismic first arrival times from crosshole, VSP, and reversed VSP (RVSP) experiments are collectively inverted by least‐squares for the velocity distribution between two boreholes. The tomographic reconstruction exhibits a large lateral velocity contrast that is not supported by the surface reflection data from the same location. After examining the traveltime residuals from the three tomographic datasets separately, we conclude that the velocity contrast is due primarily to static delays in the RVSP first arrival times. When a first‐order correction is made for the statics, tomographic inversion results in a velocity reconstruction that is more consistent with the surface reflection data. To isolate the velocity errors produced by the RVSP statics, we compute a residual tomogram by subtracting the statics adjusted tomogram from the original. The residual tomogram shows that the statics introduce errors not only in the region sampled by the RVSP rays, but they indirectly contaminate other regions of the tomogram as well. We reproduce this velocity error distribution as part of a model study designed to simulate the effects of statics on tomographic velocity reconstructions. Results indicate that traveltime errors on the order of 2 percent can result in tomographic velocity errors of up to 7 percent.
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Almutiry, Waleed. "Inverted Length-Biased Exponential Model: Statistical Inference and Modeling." Journal of Mathematics 2021 (October 26, 2021): 1–8. http://dx.doi.org/10.1155/2021/1980480.
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This research article proposes a new probability distribution, referred to as the inverted length-biased exponential distribution. The hazard rate function (HZRF) and density function (PDF) in the new distribution allow additional flexibility as well as some desired features. It provides a more flexible approach that may be used to represent many forms of real-world data. The quantile function (QuF), moments (MOs), moment generating function (MOGF), mean residual lifespan (MRLS), mean inactivity time (MINT), and probability weighted moments (PRWMOs) are among the mathematical and statistical features of the inverted length-biased exponential distribution. In the case of complete and type II censored samples (TIICS), the maximum likelihood (MLL) strategy can be used to estimate the model parameters. An asymptotic confidence interval (COI) of parameter is constructed at two confidence levels. We perform simulation study to examine the accuracy of estimates depending upon some statistical measures. Simulation results show that there is great agreement between theoretical and empirical studies. We demonstrate the new model’s relevance and adaptability by modeling three lifespan datasets. The proposed model is a better fit than the half logistic inverse Rayleigh (HLOIR), type II Topp–Leone inverse Rayleigh (TIITOLIR), and transmuted inverse Rayleigh (TRIR) distributions. We anticipate that the expanded distribution will attract a broader range of applications in a variety of fields of research.
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Lee, Jeong-Eun, Sol-A. Kim, Hyun-Jin Park, Hyoyoung Mun, and Won-Bo Shim. "Development of an Inverted Y-Shaped Strip for the Detection of Organophosphorus and Carbamate Residual Pesticides." Journal of Food Hygiene and Safety 36, no. 1 (February 28, 2021): 1–8. http://dx.doi.org/10.13103/jfhs.2021.36.1.1.
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Lozovan, A. A., S. Ya Betsofen, A. S. Lenkovets, A. A. Labutin, D. K. Kostrin, and I. A. Grushin. "Study of the texture and residual stresses in multilayer Nb/Mo coatings obtained by inverted magnetrons." Journal of Physics: Conference Series 1799, no. 1 (February 1, 2021): 012020. http://dx.doi.org/10.1088/1742-6596/1799/1/012020.
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Fleming, Aaron, Stephanie Huang, and He Huang. "Proportional Myoelectric Control of a Virtual Inverted Pendulum Using Residual Antagonistic Muscles: Toward Voluntary Postural Control." IEEE Transactions on Neural Systems and Rehabilitation Engineering 27, no. 7 (July 2019): 1473–82. http://dx.doi.org/10.1109/tnsre.2019.2922102.
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Yang, Eunhye, Hyunjong Yu, Jun-Young Park, Kyung-Min Park, and Pahn-Shick Chang. "Microfluidic Preparation of Liposomes Using Ethyl Acetate/n-Hexane Solvents as an Alternative to Chloroform." Journal of Chemistry 2018 (December 18, 2018): 1–6. http://dx.doi.org/10.1155/2018/7575201.
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Although liposomes have been used as a nutrient delivery carrier in the pharmaceutical, cosmetic, and food industries, they still suffer from the critical issue caused by the use of halogenated solvents (e.g., chloroform), which may be harmful to humans. Nonhalogenated solvents have been screened as candidate substitutes for chloroform based on their physicochemical properties. However, none of the candidates examined to date could form stable inverted micelles when used alone. Here, to obtain physicochemical properties similar to chloroform, combined mixtures were prepared using various ratios of each candidate. Based on the results of random combination trials with numerous candidates, ethyl acetate: n-hexane = 4 : 1(v/v) was selected as the optimum ratio because it could form stable inverted micelles and a transparent liposome solution without phase separation. The ethyl acetate and n-hexane mixture are a potential substitute for chloroform, which may resolve concerns regarding the toxicity of residual halogenated solvents in lipid nanovesicles.
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Chen, Weixun, Siming Meng, and Yuelong Jiang. "Foreign Object Detection in Railway Images Based on an Efficient Two-Stage Convolutional Neural Network." Computational Intelligence and Neuroscience 2022 (August 28, 2022): 1–10. http://dx.doi.org/10.1155/2022/3749635.
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Foreign object intrusion is one of the main causes of train accidents that threaten human life and public property. Thus, the real-time detection of foreign objects intruding on the railway is important to prevent the train from colliding with foreign objects. Currently, the detection of railway foreign objects is mainly performed manually, which is prone to negligence and inefficient. In this study, an efficient two-stage framework is proposed for foreign object detection in railway images. In the first stage, a lightweight railway image classification network is established to classify any input railway images into one of two classes: normal or intruded. To enable real-time and accurate classification, we propose an improved inverted residual unit by introducing two improvements to the original inverted residual unit. First, the selective kernel convolution is used to dynamically select kernel size and learn multiscale features from railway images. Second, we employ a lightweight attention mechanism, called the convolutional block attention module, to exploit both spatial and channel-wise relationships between feature maps. In the second stage of our framework, the intruded image is fed to the foreign object detection network to further detect the location and class of the objects in the image. Experimental results confirm that the performance of our classification network is comparable to the widely used baselines, and it obtains outperforming efficiency. Moreover, the performances of the second-stage object detection are satisfying.
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Zhao, Yao, Huihui Guo, Liang Gao, Chang Liu, Xinzhong Xu, and Wendan Cheng. "Minimally invasive versus traditional inverted “L” approach for posterior cruciate ligament avulsion fractures: a retrospective study." PeerJ 10 (July 14, 2022): e13732. http://dx.doi.org/10.7717/peerj.13732.
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Purpose To evaluate the clinical efficacy of a minimally invasive arthroscopic approach and to compare it with the traditional inverted “L” approach for the treatment of posterior cruciate ligament (PCL) avulsion fractures. Methods From January 2016 to January 2020, the clinical data from patients with PCL avulsion fracture of the tibial insertion were analyzed retrospectively. They were divided into two groups based on surgical approaches: minimally invasive approach group (n = 15) and traditional inverted “L” group (n = 15 cases). The operation time, incision length, intraoperative blood loss, hospitalization time and complications were all recorded and compared between the two groups. The fracture healing time, knee range of motion (ROM), and residual relaxation degree were compared between the two groups after regular follow-up. The International Knee Documentation Committee (IKDC) and Lysholm scores were used to assess knee joint function. Results There were no significant differences between the two groups in terms of gender, age, side, body mass index, cause of injury, Meyers McKeever classification and time from injury to operation (P > 0.05). The incision length and intraoperative bleeding in the minimally invasive group were significantly lower (P < 0.05) than those in the traditional group. There were no significant differences between the two groups in terms of operative time, fracture healing time, or residual relaxation (P > 0.05). The Lachman test and posterior drawer test were both negative, and there were no postoperative complications. The VAS pain score within 2 weeks and ROM within 4 weeks in the minimally invasive group were significantly better (P < 0.05) than those in the traditional inverted “L” approach group. The knee joint stability of both groups was good 12 months after surgery, and there were no significant differences in IKDC score, Lysholm score and ROM (P > 0.05) between the two groups. Conclusion The minimally invasive approaches for the treatment of PCL avulsion fractures provide adequate exposure without the surgical complications associated with traditional open surgical approaches. The procedure is safe, fast and minimally invasive, and does not need a long learning curve.
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Johnsson, F., D. Shaw, M. Gabb, J. Dent, and I. Cook. "Influence of gravity and body position on normal oropharyngeal swallowing." American Journal of Physiology-Gastrointestinal and Liver Physiology 269, no. 5 (November 1, 1995): G653—G658. http://dx.doi.org/10.1152/ajpgi.1995.269.5.g653.
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The influence of gravity, if any, on pharyngeal bolus transport is unknown. The aim of the present study was to evaluate the effect of gravity and body position on the radiological and manometric events during the normal oropharyngeal swallow. In eight healthy male volunteers, we performed simultaneous videoradiography and manometry, using a manometry catheter incorporating a perfused sleeve measuring upper esophageal sphincter pressure and three solid-state transducers recording pharyngeal pressures. Swallows of 5 and 10 ml of barium were performed in three different body positions: upright, horizontal, and 30 degrees head down (inverted). Hypopharyngeal intrabolus pressure increased significantly in the horizontal and inverted positions compared with upright, P = 0.0001. This resulted in increased maximal sphincter diameters during bolus flow (P = 0.0001) and shorter duration of sphincter opening (P = 0.03). As a result, transsphincteric flow increased in the horizontal and inverted positions, P = 0.04. Total swallowing duration, oral and pharyngeal transit time, pharyngeal peristaltic amplitude and duration, the length of the bolus in the pharynx, and excursions of the hyoid and larynx were unaffected by body position. We conclude that intrabolus pressure is an important determinant of upper esophageal sphincter opening in the healthy oropharynx and that gravity does not influence pharyngeal bolus transport. The healthy upper esophageal sphincter has residual opening capacity that can be demonstrated by altering body posture.
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Oikawa, Keita, Yasushi Furuta, Yuji Nakamaru, Nobuhiko Oridate, and Satoshi Fukuda. "Preoperative Staging and Surgical Approaches for Sinonasal Inverted Papilloma." Annals of Otology, Rhinology & Laryngology 116, no. 9 (September 2007): 674–80. http://dx.doi.org/10.1177/000348940711600909.
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Objectives: We sought to determine the value of preoperative staging by magnetic resonance imaging (MRI) assessment in the surgical management of sinonasal inverted papillomas (IPs). Methods: Preoperative MRI staging was used to assess 22 patients with IPs. In addition to the Krouse staging system, T3 cases were categorized as subgroup T3-B if tumors extended into the frontal sinus or the supraorbital recess; otherwise, they were categorized as T3-A. Standard endoscopic sinus surgery (ESS) was the first choice for T1 and T2 cases. Endoscopic approaches, including ESS combined with endoscope-assisted transantral approach and endoscopic medial maxillectomy, were considered in T3-A cases, and external approaches were considered in T3-B cases. Patients were followed for a minimum of 1 year after surgery. Results: Preoperative MRI staging and postoperative staging were coincident in 21 of the 22 patients (95%). All 8 T2 cases were treated by an endoscopic approach. Of 10 T3-A cases, 9 (90%) were treated by an endoscopic approach and 1 (residual case) was treated by an external approach. All 3 of the T3-B cases underwent an external approach. One T4 case with malignant transformation underwent an external approach followed by radiotherapy. After a median follow-up period of 22 months, none of the 22 patients had had a recurrence. No major complications were observed after endoscopic approaches, but epiphora or hemorrhage requiring transfusion occurred in 3 of the 5 patients (60%) who underwent external approaches. Conclusions: Preoperative staging of IP by MRI is useful for selecting cases that can be managed by endoscopic approaches, resulting in lower rates of tumor recurrence and morbidity.
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Chen, Minmo, Ze-Nan Zhu, Chuanzheng Zhang, Xiao-Hua Zhu, Min Wang, Xiaopeng Fan, Ruixiang Zhao, Ju Lin, and Arata Kaneko. "Mapping Current Fields in a Bay Using a Coast-Fitting Tomographic Inversion." Sensors 20, no. 2 (January 20, 2020): 558. http://dx.doi.org/10.3390/s20020558.
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Coast-fitting tomographic inversion that is based on function expansion using three types of normal modes (the Dirichlet, Neumann, and open boundary modes) is proposed to reconstruct current fields from the coastal acoustic tomography (CAT) data. The superiority of the method was validated while using CAT data that were obtained in 2015 in the Dalian Bay. The semidiurnal tidal and residual current fields were accurately reconstructed over the entire model domain surrounded by coasts and open boundaries. The proposed method was effective, particularly around the peripheral regions of the tomography domain and the near-coast regions outside the domain, where accurate results are not expected from the conventional inverse method based on function expansion by Fourier function series with no coast fittings. The error velocity for the semidiurnal tidal currents was 2.2 cm s−1, which was calculated from the root-mean-square-difference between the CAT-observed and inverted range-averaged currents that were obtained along the nine peripheral transmission paths. The error velocity for the residual currents estimated from the 12-h mean net residual transport at the bay mouth was 0.9 cm s−1. The errors were significantly smaller than the amplitude of the tidal and residual currents.
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Li, Lei, Ying Xu, Lizi Yan, Shengli Wang, Guolin Liu, and Fan Liu. "A Regional NWP Tropospheric Delay Inversion Method Based on a General Regression Neural Network Model." Sensors 20, no. 11 (June 3, 2020): 3167. http://dx.doi.org/10.3390/s20113167.
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Tropospheric delay is a major error source that affects the initialization and re-initialization speed of the Global Navigation Satellite System’s (GNSS) medium-/long-range baseline in Network Real-Time Kinematic (NRTK) positioning. Fusing the meteorological data from the Numerical Weather Prediction (NWP) model to estimate the zenith tropospheric delay (ZTD) is one of the current research hotspots. However, research has shown that the ZTD derived from NWP models is still not accurate enough for high-precision GNSS positioning applications without the estimation of the residual tropospheric delay. To date, General Regression Neural Network (GRNN) has been applied in many fields. It has a high learning speed and simple structure, and can approximate any function with arbitrary precision. In this study, we developed a regional NWP tropospheric delay inversion method based on a GRNN model to improve the accuracy of the tropospheric delay derived from the NWP model. The accuracy of the tropospheric delays derived from reanalysis data of the European Center for Medium-Range Weather Forecasts (ECMWF) and the US National Centers for Environmental Prediction (NCEP) was assessed through comparisons with the results of the International GPS Service (IGS). The variation characteristics of the residual of the ZTD inverted by NWP data were analyzed considering the factors of temperature, humidity, latitude, and season. To evaluate the performance of this new method, the National Center Atmospheric Research (NCAR) troposphere data of 650 stations in Japan in 2005 were collected as a reference to compare the accuracy of the ZTD before and after using the new method. The experimental results showed that the GRNN model has obvious advantages in fitting the NWP ZTD residual. The mean residual and the root mean square deviation (RMSD) of the ZTD inverted using the method of this study were 9.5 mm and 12.7 mm, respectively, showing reductions of 20.8% and 19.1%, respectively, as compared to the standard NWP model. For long-range baseline (155 km and 207 km), the corrected NWP-constrained RTK showed a reduction of over 43% in the initialization time compared with the standard RTK, and showed a reduction of over 24% in the initialization time compared with the standard NWP-constrained RTK.
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Colombo, Daniele, Federico Miorelli, Ernesto Sandoval, and Kevin Erickson. "Fully automated near-surface analysis by surface-consistent refraction method." GEOPHYSICS 81, no. 4 (July 2016): U39—U49. http://dx.doi.org/10.1190/geo2016-0018.1.
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Industry practices for near-surface analysis indicate difficulties in coping with the increased number of channels in seismic acquisition systems, and new approaches are needed to fully exploit the resolution embedded in modern seismic data sets. To achieve this goal, we have developed a novel surface-consistent refraction analysis method for low-relief geology to automatically derive near-surface corrections for seismic data processing. The method uses concepts from surface-consistent analysis applied to refracted arrivals. The key aspects of the method consist of the use of common midpoint (CMP)-offset-azimuth binning, evaluation of mean traveltime and standard deviation for each bin, rejection of anomalous first-break (FB) picks, derivation of CMP-based traveltime-offset functions, conversion to velocity-depth functions, evaluation of long-wavelength statics, and calculation of surface-consistent residual statics through waveform crosscorrelation. Residual time lags are evaluated in multiple CMP-offset-azimuth bins by crosscorrelating a pilot trace with all the other traces in the gather in which the correlation window is centered at the refracted arrival. The residuals are then used to build a system of linear equations that is simultaneously inverted for surface-consistent shot and receiver time shift corrections plus a possible subsurface residual term. All the steps are completely automated and require a fraction of the time needed for conventional near-surface analysis. The developed methodology was successfully performed on a complex 3D land data set from Central Saudi Arabia where it was benchmarked against a conventional tomographic work flow. The results indicate that the new surface-consistent refraction statics method enhances seismic imaging especially in portions of the survey dominated by noise.
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Lu, Xin, Xiaoxu Liu, Bowen Li, and Jie Zhong. "Data-Driven State Prediction and Sensor Fault Diagnosis for Multi-Agent Systems with Application to a Twin Rotational Inverted Pendulum." Processes 9, no. 9 (August 26, 2021): 1505. http://dx.doi.org/10.3390/pr9091505.
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When a multi-agent system is subjected to faults, it is necessary to detect and classify the faults in time. This paper is motivated to propose a data-driven state prediction and sensor fault classification technique. Firstly, neural network-based state prediction model is trained through historical input and output data of the system. Then, the trained model is implemented to the real-time system to predict the system state and output in absence of fault. By comparing the predicted healthy output and the measured output, which can be abnormal in case of sensor faults, a residual signal can be generated. When a sensor fault occurs, the residual signal exceeds the threshold, a fault classification technique is triggered to distinguish fault types. Finally, the designed data-driven state prediction and fault classification algorithms are verified through a twin rotational inverted pendulum system with leader-follower mechanism.
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Sham, Cheuk Lun, John Kong Sang Woo, and Charles Andrew van Hasselt. "Endoscopic resection of inverted papilloma of the nose and paranasal sinuses." Journal of Laryngology & Otology 112, no. 8 (August 1998): 758–64. http://dx.doi.org/10.1017/s0022215100141611.
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AbstractThe results of a retrospective study of 22 patients with inverted papillomas resected by the endoscopic approach are presented with a follow-up of 33 to 96 months. Twenty-one patients had unilateral disease and one patient had bilateral involvement. None of the patients had orbital or cranial extension. One patient had synchronous carcinoma in situ. Eight patients had undergone previous surgical procedures. Following endoscopic surgery, six patients had residual disease requiring further revisions. Three of these six patients eventually required excision via limited external approaches. No patient required lateral rhinotomy or mid-facial degloving procedures. No complication occurredin any of the patients. The advantages of endoscopic surgery include precise determination of tumour extent, preservation of normal mucosa and bony structures and avoidance of external scars. Close endoscopic follow-up is mandatory to ensure early recognition and treatment of recurrent disease. Although the endoscopic approach is gaining popularity for the treatment of inverted papilloma, indiscriminate application may result in a high recurrence rate. The endoscopic approach should be performed by experienced surgeons and restricted to carefully selected patients with nasal, ethmoidal and limited maxillary disease. More extensive disease should be managed by radical external approaches or by combining endoscopic with limited external approaches.
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Nguyen, Manh Hoang, and Thi Quy Vo. "Residual State Ownership and Firm Performance: A Case of Vietnam." Journal of Risk and Financial Management 15, no. 6 (June 9, 2022): 259. http://dx.doi.org/10.3390/jrfm15060259.
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Privatization has played an important role in national economic reform in Vietnam. However, unlike other transitional countries in Central and Eastern Europe, Vietnam has chosen a partial and gradual privatization where the government still holds significant ownership in most privatized firms. Whether partial privatization can enhance privatized firms’ performance or full privatization should have been implemented is a critical question that needs to be answered. This paper utilizes semiparametric regressions to study the relationship between residual state ownership and firm performance. The results indicate an inverted U relationship between state ownership and firm performance. We show that the performance of privatized firms improves with an increase in the level of state ownership until around 40%, after which the effect of state ownership on firm performance tends to decline. This demonstrates that in a transitional context, relinquishing governmental control via privatization can significantly benefit privatized firm performance. However, further reduction of state ownership may decrease the performance of privatized firms. Overall, the study contributes significantly to the growing body of evidence on the nonlinear effects of state ownership. This suggests that in the transitional context of Vietnam, due to weak corporate governance and limited protection of minority shareholders, there could be a temporary optimal position where state and private investors hold balanced ownership to simultaneously supervise operations and promote the performance of privatized firms.
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Huang, Shu, Jian Zhong Zhou, Yi Bin Chen, Yue Qing Sun, and Jian Jun Du. "Theoretical and Experimental Study on Laser Compound Forming of Plate." Key Engineering Materials 375-376 (March 2008): 343–47. http://dx.doi.org/10.4028/www.scientific.net/kem.375-376.343.
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An emerging process named laser compound forming of plate was presented by analyzing the advantages of laser thermal-stress forming (LTF) and laser peen forming (LPF) respectively. This technique combined the heat effect of continuous laser and mechanical effect of pulsed laser. Based on introducing the process of laser pre-stressed compound peen forming, the mechanism of plastic deformation and residual stress were analyzed. In order to apply pre-stressed load, a CO2 laser was used to scan SUS304 stainless plate according to the designed tracks firstly, the basic shape were formed and the contours of plate’s surface were measured by the optical scan measuring system, reverse engineering software Imageware was used to establish the virtual models of plate. Then the virtual models were inverted into finite element models by FEM code ABAQUS. The optimum distribution of residual stress field was obtained by adjusting laser parameters and controlling tracks of LPF. Finally, the optimized laser parameters and processing condition were used for LPF experiment. The results indicated that the anticipated shape could be obtained, and both side of the plate hold residual compressive stress after laser compound forming.
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Que, Tingli, Xin Chen, Dan Guan, Qingqing Yun, Huoxin Luan, Xuechen Tang, Jinxin Cao, Zheyu Liu, and Xiaobin Nie. "Investigation of the Flow Intensity in an Inverted Seven-Point Well Pattern and Its Influence on the EOR Efficiency of S/P Flooding." Energies 15, no. 18 (September 10, 2022): 6632. http://dx.doi.org/10.3390/en15186632.
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Polymer and surfactant (S/P) binary flooding is a widely used chemical flooding technology for enhanced oil recovery (EOR). However, it is mostly used in the five-spot well pattern, and there is little research on the effect of well patterns on its flow law and EOR efficiency in the reservoir. In this paper, the flow intensity of S/P flooding in an inverted seven-spot well unit and its EOR efficiency are investigated. Based on the theoretical derivation and simulation, the flow distribution at different positions in the inverted seven-spot well pattern unit was calculated. The oil displacement efficiency was evaluated by simulating different flow intensities with various flow velocity. The microscopic residual oil of the core at the end of displacement was scanned and recognized. The 2D model was used to simulate the well pattern to clarify the EOR of S/P flooding. The results show that the swept area in the well unit can be divided into the strong swept region (>0.2 MPa); medium swept region (0.1–0.2 MPa); weak swept region (0.03–0.1 MPa); and invalid swept region (<0.03 MPa), according to the pressure gradient distribution. Compared to the five-spot well pattern, the inverted seven-spot well pattern featured a weak swept intensity, but a large swept area and lower water cut rise rate. Increasing the flow intensity can improve oil displacement efficiency, and disperse and displace continuous cluster remaining oil. The 2D model experiments show that the incremental oil recoveries by SP flooding after water flooding in the five-spot well pattern and inverted seven-spot well pattern are 25.73% and 17.05%, respectively. However, the ultimate oil recoveries of two well patterns are similar by considering the previous water flooding.
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Dutta, Gaurav, Matteo Giboli, Cyril Agut, Paul Williamson, and Gerard T. Schuster. "Least-squares reverse time migration with local Radon-based preconditioning." GEOPHYSICS 82, no. 2 (March 1, 2017): S75—S84. http://dx.doi.org/10.1190/geo2016-0117.1.
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Least-squares migration (LSM) can produce images with better balanced amplitudes and fewer artifacts than standard migration. The conventional objective function used for LSM minimizes the L2-norm of the data residual between the predicted and the observed data. However, for field-data applications in which the recorded data are noisy and undersampled, the conventional formulation of LSM fails to provide the desired uplift in the quality of the inverted image. We have developed a least-squares reverse time migration (LSRTM) method using local Radon-based preconditioning to overcome the low signal-to-noise ratio (S/N) problem of noisy or severely undersampled data. A high-resolution local Radon transform of the reflectivity is used, and sparseness constraints are imposed on the inverted reflectivity in the local Radon domain. The sparseness constraint is that the inverted reflectivity is sparse in the Radon domain and each location of the subsurface is represented by a limited number of geologic dips. The forward and the inverse mapping of the reflectivity to the local Radon domain and vice versa is done through 3D Fourier-based discrete Radon transform operators. The weights for the preconditioning are chosen to be varying locally based on the relative amplitudes of the local dips or assigned using quantile measures. Numerical tests on synthetic and field data validate the effectiveness of our approach in producing images with good S/N and fewer aliasing artifacts when compared with standard RTM or standard LSRTM.
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Mitchell, D. A., M. Wimbush, D. R. Watts, and W. J. Teague. "The Residual GEM Technique and Its Application to the Southwestern Japan/East Sea." Journal of Atmospheric and Oceanic Technology 21, no. 12 (December 1, 2004): 1895–909. http://dx.doi.org/10.1175/jtech-1668.1.
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Abstract The standard gravest empirical mode (GEM) technique for utilizing hydrography in concert with integral ocean measurements performs poorly in the southwestern Japan/East Sea (JES) because of a spatially variable seasonal signal and a shallow thermocline. This paper presents a new method that combines the U.S. Navy's Modular Ocean Data Assimilation System (MODAS) static climatology (which implicitly contains the mean seasonal signal) with historical hydrography to construct a “residual GEM” from which profiles of such parameters as temperature (T) and specific volume anomaly (δ) can be estimated from measurements of an integral quantity such as geopotential height or acoustic echo time (τ). This is called the residual GEM technique. In a further refinement, sea surface temperature (SST) measurements are included in the profile determinations. In the southwestern JES, profiles determined by the standard GEM technique capture 70% of the T variance and 64% of the δ variance, while the residual GEM technique using SST captures 89% of the T variance and 84% of the δ variance. The residual GEM technique was applied to optimally interpolated τ measurements from a two-dimensional array of pressure-gauge-equipped inverted echo sounders moored from June 1999 to July 2001 in the southwestern JES, resulting in daily 3D estimated fields of T and δ throughout the region. These estimates are compared with those from direct measurements and good agreement is found between them.
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Ramírez, Fred C., Gumercindo A. Castillo, Ymber Flores, Octavio F. Galván, Luisa Riveros, and Lyanna H. Sáenz. "Composition, structure and ecological importance of Moraceae in a residual forest of Ucayali, Peru." Sustainable Forestry 5, no. 1 (June 1, 2022): 62. http://dx.doi.org/10.24294/sf.v5i1.1621.
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Species of the Moraceae family are of great economic, medicinal and ecological importance in Amazonia. However, there are few studies on their diversity and population dynamics in residual forests. The objective was to determine the composition, structure and ecological importance of Moraceae in a residual forest. The applied method was descriptive and consisted of establishing 16 plots of 20 m × 50 m (0.10 ha), in a residual forest of the Alexánder von Humboldt substation of the National Institute of Agrarian Innovation-INIA, Pucallpa, department of Ucayali, where individuals of arboreal or hemi-epiphytic habit, with DBH ≥ 2.50 cm, were evaluated. The floristic composition was represented by 33 species, distributed in 12 genera; five species not recorded for Ucayali were found. Structurally, the family was represented by 138 individuals/ha with a horizontal distribution similar to an irregular inverted “J”. However, there were different horizontal structures among species. It was determined that 85% of the species were in diameter class I (2.50 to 9.99 cm), being the most abundant Pseudolmedia laevis (Ruiz & Pav.) J.F. Macbr. (41.88 individuals/ha); and the most dominant were Brosimum utile (Kunth) Oken (1.71 m2∕ha) and Brosimum alicastrum subsp. bolivarense (Pittier) C.C.Berg (0.90 m2/ha). Likewise, P. laevis and B. utile were the most ecologically important. The information from the present research will allow the establishment of a baseline, which can be used to propose the management of Moraceae in residual forests in the same study area.
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Strojan, Primož, Simona Jereb, Imre Borsos, Jasna But-Hadzic, and Nina Zidar. "Radiotherapy for inverted papilloma: a case report and review of the literature." Radiology and Oncology 47, no. 1 (January 1, 2013): 71–76. http://dx.doi.org/10.2478/v10019-012-0045-8.
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Abstract Background. Sinonasal inverted papilloma (IP) is a rare, usually benign tumor arising from the respiratory mucosa of the sinonasal tract. Surgical resection is the treatment of choice. In histologically overt benign IPs (i.e. without associated malignancy) irradiation was employed only anecdotally. The patient with gross residual of benign IP after up-front surgery that was subsequently treated with irradiation is presented and the literature reports on the use of radiotherapy (RT) in this tumor type are reviewed. Case report. After the surgical treatment the residuum in the region of the sphenoid and adjacent cavernous sinus was irradiated to 54 Gy in 1.8 Gy daily fractions. No recurrence or deterioration of olfaction, hearing or vision was observed 2.6 years post-RT. Review of the literature. In the literature, six reports were identified with 16 patients describing necessary details on RT and outcome. Twelve of 14 cases (our case included) with gross or subtotal tumor resection and postoperative RT were locally controlled. The lowest and the median irradiation doses were 47.15 Gy and 56.5 Gy, respectively, and the follow-up period ranged between 0.5-20.5 years (median 7.8 years). Conclusions. RT is safe and valuable treatment option in histologically overt benign IPs. It is indicated when the risk of tumor recurrence after surgery is increased and in inoperable tumors.
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Kuan, Edward C., John W. Frederick, Miguel F. Palma Diaz, Dean W. Lim, and Jeffrey D. Suh. "Complete Response of Skull Base Inverted Papilloma to Chemotherapy: Case Report." Allergy & Rhinology 8, no. 2 (January 2017): ar.2017.8.0201. http://dx.doi.org/10.2500/ar.2017.8.0201.
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Background Inverted papilloma (IP) is the most common benign sinonasal neoplasm. Endoscopic techniques, improved understanding of pathophysiology, and novel surgical approaches have allowed rhinologists to treat IPs more effectively, with surgery being the mainstay of therapy. Frontal sinus IP poses a challenge for surgical therapy due to complex anatomy and potentially difficult surgical access. Objectives We reported a unique case of a massive frontal sinus IP that presented with intracranial and orbital extension, with near resolution after chemotherapy. Methods A retrospective case review of a patient with a frontal sinus IP treated at a tertiary academic medical center. Results A 75-year-old male patient presented with nasal obstruction, purulent nasal discharge, and a growing left supraorbital mass. Endoscopy demonstrated a mass that filled both frontal and ethmoid sinuses, with orbital invasion. There also was substantial erosion of the posterior table, which measured 1.73 × 1.40 cm. A biopsy specimen demonstrated IP with carcinoma in situ. The patient was deemed unresectable on initial evaluation and, subsequently, underwent chemotherapy (carboplatin and paclitaxel). The tumor had a dramatic response to chemotherapy, and the patient elected for definitive surgery to remove any residual disease. During surgery, only a small focus of IP was found along the superior wall of the frontal sinus. No tumor was found elsewhere, including at the site of skull base erosion. The final pathology was IP without carcinoma in situ or dysplasia. Conclusion This was the first reported case of chemotherapeutic “debulking” of IP, which facilitated surgical resection, despite substantial intracranial and orbital involvement. Although nearly all IPs can be treated surgically, rare cases, such as unresectable tumors, may benefit from systemic chemotherapy.
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Hani, Osama Bani, Omar Halalsheh, Yazeed Mohammad, Anas Bani Yaseen, Ruba Khasawneh, Nour Al–Sheikh, Mais Al-Khalili, and Mohannad Mahmoud Alomari. "Crossed renal ectopia with an unusual form of fusion (inverted U shape) managed by novel approach – laparoscopic ureterocalicostomy. A case report." Journal of Clinical and Investigative Surgery 6, no. 1 (May 10, 2021): 71–75. http://dx.doi.org/10.25083/2559.5555/6.1.14.
Full textAbstract:
Herein we present a case of crossed renal ectopia with an unusual type of fusion, discovered incidentally in a 11-year-old girl presented with recurrent urinary tract infections. Both kidneys were located on the right side of the body fused in their upper poles only, forming an inverted U shape. After reviewing the published data on this topic, we found that most of the described anomalies were within the six well-known types of fusion anomalies. This child had an unusual clinical presentation of severe hydronephrosis of the orthotopic kidney. A unique surgical technique to correct the pathology to be able to preserve the residual mass of that kidney was performed.