The simultaneous measurement of the numerical aperture (NA) and mode field diameter (MFD) of single-mode fibers was performed on several commercial fibers by means of digital image processing of the output light projected into a screen. In addition, the changes induced by core diffusion in an ultra-high (UH) NA fiber at several heat depositions from a ${\mathrm{CO}}_2$ laser source were measured. The measurement method was demonstrated to be useful to monitor the adiabaticity of this process, by taking the product of the NA and MFD to verify if it remains constant. The method provides a cheap alternative to measure these optical fiber parameters by using simple optomechanical elements and a readily available smartphone camera, and it can be easily implemented in the laboratory.

Oblique inflow breaks the nominal rotational periodicity of a geometrically symmetric propeller by introducing an azimuth-dependent velocity component across the rotor disk. This study develops a transparent reduced order blade element/momentum framework to examine the resulting once-per-revolution aerodynamic loading of a representative two-bladed small UAV propeller. The formulation combines blade element aerodynamics, momentum-based induction, Fourier decomposition, and advancing–retreating blade diagnostics over moderate oblique inflow conditions. Particular attention is given to distinguishing quantities that arise directly from the assumed harmonic structure from quantities that provide independent aerodynamic information. A first-order analytical expansion shows that, for small in-plane velocity, the normalized first-harmonic loading scales approximately with the in-plane velocity ratio and therefore with J sin(α), consistent with the numerical model. The analysis additionally reports the absolute first-harmonic load amplitude, spanwise development of the asymmetry, cross-plane hub load components, circulation imbalance, and sensitivity to aerodynamic model assumptions. Published axial and non-axial propeller data are used to establish the range over which the reduced order trends can be interpreted. The results indicate that advance ratio and inflow angle govern the modeled cyclic asymmetry, whereas quantitative magnitudes remain sensitive to sectional aerodynamic assumptions and induced flow representation. The framework is therefore intended as a computationally inexpensive screening and interpretation tool for oblique inflow symmetry breaking rather than as a substitute for phase-resolved CFD or experimental measurements.

Public-security policy is commonly assessed through operational outputs and crime-related indicators, yet policy performance also depends on the administrative and governance arrangements through which priorities are diagnosed, coordinated, implemented, evaluated, corrected, and subjected to public accountability. This conceptual study develops an integrated governance framework for evidence-informed public-security policy through a theory-driven synthesis of public management, policy capacity, collaborative governance, whole-of-government coordination, evidence-informed policymaking, performance management, organizational learning, public value, police legitimacy, accountability, and security-governance scholarship. The synthesis distinguishes five management functions—strategic diagnosis, policy design, collaborative governance, implementation capability, and evaluation and organizational learning—and connects them to a multilevel capability-to-legitimacy architecture. The framework’s incremental contribution lies not in introducing these constructs individually, but in specifying the interfaces through which mandates, resources, evidence, coordination arrangements, implementation capabilities, performance information, accountability mechanisms, and legitimacy conditions interact across the public-security policy process. Particular attention is given to construct boundaries, level-of-analysis distinctions, feedback mechanisms, and conditions under which otherwise desirable management arrangements may fail or produce trade-offs. Mexico is included as an illustrative documentary vignette rather than as an empirical validation case, using current federal planning and public-security instruments to demonstrate how the proposed analytical categories can be operationalized. The framework is presented as a candidate integrative heuristic whose propositions, measurement structure, and cross-level relationships require future empirical testing.