Line Edge Roughness (LER) becomes increasingly critical to control at smaller dimensions. The LER also tends to become worse at smaller line widths and higher aspect ratios [1]. We explored shrinking line width by lit...
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As the number of airports rises, the safety monitoring requirements for airport structures and surrounding supporting facilities during the operational phase are becoming increasingly urgent. SAR as an active ground o...
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The rise of e-hailing services has transformed urban transportation, offering on-demand rides via mobile apps that outpace traditional taxis and fixed public transport schedules. These services enhance mobility for di...
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Ultrafast lasers have become powerful tools in various fields,and increasing their fundamental repetition rates to the gigahertz(GHz)level holds great potential for frontier scientific and industrial *** various schem...
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Ultrafast lasers have become powerful tools in various fields,and increasing their fundamental repetition rates to the gigahertz(GHz)level holds great potential for frontier scientific and industrial *** various schemes,passive mode-locking in ultrashort-cavity fiber laser is promising for generating GHz ultrashort pulses(typically solitons),for its simplicity and ***,its pulse energy is far lower than the critical value of the existing theory,leading to open questions on the mode-locking mechanism of GHz fiber ***,we study the passive mode-locking in GHz fiber lasers by exploring dynamic gain depletion and recovery(GDR)effect,and establish a theoretical model for comprehensively understanding its low-threshold mode-locking mechanism with multi-GHz fundamental repetition ***,the GDR effect yields an effective interaction force and thereby binds multi-GHz solitons to form a counterpart of soliton *** is found that the resulting collective behavior of the solitons effectively reduces the saturation energy of the gain fiber and permits orders of magnitude lower pulse energy for continuous-wave mode-locking(CWML).A new concept of quasi-single soliton defined in a strongly correlated length is also proposed to gain insight into the dynamics of soliton assembling,which enables the crossover from the present mode-locking theory to the existing ***,two distinguishing dynamics of Q-switched mode-locking that respectively exhibit rectangular-and Gaussian-shape envelopes are theoretically indicated and experimentally verified in the mode-locked GHz fiber laser through the measurements using both the standard real-time oscilloscope and emerging time-lens *** on the proposed criterion of CWML,we finally implement a GDR-mediated mode-locked fiber laser with an unprecedentedly high fundamental repetition rate of up to 21 GHz and a signal-tonoise ratio of 85.9 dB.
Successful preparation of perpendicularly magnetized Co thin layers on Pt seed-layers using atomic layer deposition (ALD) technique with Co(PF3)4H as a precursor is reported. The residual phosphorus content in the sam...
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Observing the increase in cybersecurity attacks on our nation's and even world's critical infrastructures, heightens the priority need for being proactive in detecting possible intrusions. Each endpoint that c...
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Logs are valuable information for oil and gas fields as they help to determine the lithology of the formations surrounding the borehole and the location and reserves of subsurface oil and gas ***,important logs are of...
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Logs are valuable information for oil and gas fields as they help to determine the lithology of the formations surrounding the borehole and the location and reserves of subsurface oil and gas ***,important logs are often missing in horizontal or old wells,which poses a challenge in field *** address this issue,conventional methods involve supplementing the missing logs by either combining geological experience and referring data from nearby boreholes or reconstructing them directly using the remaining logs in the same ***,there is currently no quantitative evaluation for the quality and rationality of the constructed *** this paper,we utilize data from the 2020 machine learning competition of the Society of Petrophysicists and Logging Analysts(SPWLA),which aims to predict the missing compressional wave slowness(DTC)and shear wave slowness(DTS)logs using other logs in the same *** employ the natural gradient boosting(NGBoost)algorithm to construct an Ensemble Learning model that can predicate the results as well as their ***,we combine the SHAP(SHapley Additive exPlanations)method to investigate the interpretability of the machine learning *** compare the performance of the NGBosst model with four other commonly used Ensemble Learning methods,including Random Forest,GBDT,XGBoost,*** results show that the NGBoost model performs well in the testing set and can provide a probability distribution for the prediction *** distribution allows petrophysicists to quantitatively analyze the confidence interval of the constructed *** addition,the variance of the probability distribution of the predicted log can be used to justify the quality of the constructed *** the SHAP explainable machine learning model,we calculate the importance of each input log to the predicted results as well as the coupling relationship among input *** findings reveal that the NGBoost model
Intelligence is a trend in the development of modern society. It gives the machines the ability to control their own behavior in a specific way, in which touch becomes one of the most important sensations. A low-power...
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This paper investigates the modeling and control of an aerial flight platform built with a quadrotor for assisting in the landing of fixed-wing UAVs. During the process of landing on the aerial flight platform, the li...
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To overcome electronic device dependence on energy storage medium, current research proposes a novel multiband circularly polarized (CP), microstrip patch antenna with a voltage multiplier rectifier circuit for wirele...
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