9+ hour, 22+ min ago   (333+ words) In space-vector-modulation-based flux-linkage-loop-free direct torque control (SVM-FLLF-DTC) for permanent magnet synchronous motor (PMSM) drives, the open-loop d-axis voltage control causes an inherent magnetization effect, and the conventional single-axis flux-linkage limiting strategy entails a risk of positive-feedback runaway. To address these…...

12+ hour, 7+ min ago   (455+ words) The laminated structure in shale rock plays a crucial role in fluid migration during shale gas exploitation. This study investigated the evolution patterns and mechanisms of shale permeability under the influence of laminae through multiple permeability experiments, including steady-state flow…...

12+ hour, 45+ min ago   (503+ words) To address whirling- and vibration-induced failures in ultra-deep well drill strings caused by high slenderness ratios and complex loading conditions, this study establishes a nonlinear dynamic finite element model for a steel–titanium alloy composite drill string. The model is…...

10+ hour, 48+ min ago   (551+ words) Background: Volleyball court roles impose distinct physical demands, yet multi-domain position-specific profiles of elite female players are scarce. This study compared anthropometric characteristics and field-test physical performance across five positions. Methods: Fifty players (10 per position: setter, libero, outside hitter, opposite,…...

1+ day, 2+ hour ago   (347+ words) The delineation of mineralized zones within deposits is inherently associated with geological uncertainty, directly impacting resource-reserve estimation and eventual extraction. This study presents a comparative analysis of three geological modeling techniques, including Indicator Kriging (IK), Nearest Neighbor (NN), and Multilayer…...

1+ day, 3+ hour ago   (409+ words) Wall thinning caused by corrosion changes the circumferential strain response of storage tanks, but nonlinear coupling among structural parameters, loading conditions, strain characteristics, and defect geometry makes direct inversion difficult. This paper develops a strain-based, finite element (FE)-based machine…...

1+ day, 3+ hour ago   (495+ words) Steel storage tanks are erected on site by multi-cylinder hydraulic lifting, conventionally from one power unit feeding all cylinders through a flow divider. Decentralized alternatives have not been evaluated for this task, and modularity in fluid power is rarely quantified....

1+ day, 4+ hour ago   (361+ words) This research investigates the security of large language models (LLMs) with the aim of identifying key security and safety threats, control measures, and governance considerations that are relevant to their trustworthy adoption in the Extended Reality (XR) domain. To achieve…...

1+ day, 6+ hour ago   (443+ words) Spearmint is a medicinal and aromatic crop vulnerable to several diseases, and its cultivation relies heavily on chemical inputs, which can alter phytonutrient quality and raise environmental and health concerns. To address this, the current study focused on developing a…...

1+ day, 6+ hour ago   (507+ words) Modern corporate networks operate in increasingly complex and heterogeneous environments, which complicates the objective assessment of their current security state. This study proposes a dual-channel multi-level model for quantitative assessment of data security in corporate networks using a predefined list…...