New method for determining singularities on enveloped surface and its application to study curvature interference theory of involute worm drive

In this paper, a more computationally convenient singularity condition of the enveloped surface is proposed using the theory of linear algebra. Its preconditions are only the tangential vector of the enveloping surface, the relative velocity vector, and the total differential of the meshing function. It avoids calculating the curvature parameters of the enveloping surface. It is proved that the singularity conditions of enveloped surface from different references are equivalent to each other and the relational equations among them are obtained. The curvature interference theory for the involute worm drive is established using the proposed singularity condition. The equation for the singularity trajectory is obtained. The calculation method for the singularity trajectory is proposed and its numerical result is obtained. The influence of the design parameters on the singularity trajectory is studied using the proposed curvature interference theory. The study results show that the risk of curvature interference is high when the transmission ratio is too small, especially in the case of the single-threaded worm and large modulus. The proposed singularity condition can also be applied to study the curvature interference mechanism in other types of the worm drive and to study the undercutting mechanism when machining the worm drive.

Tunable multichannel Photonic spin Hall effect in metal-dielectric-metal waveguide

The discovery of Photonic spin Hall effect (PSHE) on surface plasmon polaritons (SPPs) is an important progress in photonics. In this paper, a method of realizing multi-channel PSHE in two-dimensional metal-air-metal waveguide is proposed. By modulating the phase difference $$\phi$$ ϕ and polar angle $$\theta$$ θ of the dipole source, the SPP can propagate along a specific channel. We further prove that PSHE results from the component wave interference theory. We believe that our findings will rich the application of SPPs in optical devices.

INTERFERENSI FONOLOGI PADA PEMBELAJAR BIPA ASAL EROPA DI BALI

This study aimed to determine phonological interference that occurs on BIPA learners from Europe in Bali. Oraland written data are used in this research that were obtained from learners' speeches and writings when learning Indonesian in the class. This research was guided by interference theory according to Weinreich (1953). Oral data were collected using proficient inversion techniques (SLC), skillful in-flight listening techniques (SBLC), recording techniques, and note taking. Writing data were collected by the test method. The data analyzed and presented in formal and informal forms. The results of data analysis showed that phonological interference that occurred in BIPA learners from Europe in Bali, namely in the form of vocal noise interference (occurred in vowels [a], [u], and [ə]), consonant sound interference (occurred in consonants [h] , [r], [g], [ŋ], [t], [g], and [ɲ]), interference in the form of sound addition (occurred in the sounds [ŋ] and [ɲ]), and interference in the form of sound removal ( occurred in consonants [r], vowel series [e] and [a], and consonants [h]). This interference occurred because of differences in vowel and consonant sounds in Indonesian and English. In addition, this interference was also caused by the different pronunciation of a vowel sound or consonant sound in both languages.

Study of a periodic spectral fluctuation existing in a fibered optical feedback cavity-enhanced absorption spectroscopy (OF-CEAS)

A special periodic spectral fluctuation is observed during the study of a fibered high sensitivity optical feedback cavity-enhanced absorption spectroscopy (OF-CEAS) for the measurement of trace gas. This spectral fluctuation is different from some phenomenon observed in former OF-CEAS which contain a resonant cavity with V-shaped configuration, such as the etalon effect and the spectral ripple effect. To reveal why this phenomenon happens and how it works, a series of hypothesis are proposed and tested, and the results show that the multi-beam interference of resonance light at the input mirror of the resonant cavity is the main reason for this phenomenon. Based on the multi-beam interference theory, a mathematical modeling of this phenomenon is built, and the theoretical analyses agree well with the experimental results. Some methods to eliminate this phenomenon are proposed and implemented, and the 1σ noise equivalent absorption coefficient of 7.6 × 10− 10 cm− 1 Hz-1/2 is attained with this robust and compact OF-CEAS system.

Breaking Out of Open-Plan: Extending Social Interference Theory Through an Evaluation of Contemporary Offices

Offices are evolving rapidly to facilitate organizational cost reductions and to better support contemporary working practices. We investigate relationships between the design of contemporary offices (physical proximity and breakout areas) and autonomy in predicting individual outcomes (ease of communication, job satisfaction, and well-being). We extend Social Interference Theory to include features of contemporary office design and explicitly explore the moderating role of autonomy. Working in differing office configurations of a global engineering company, 406 employees provided data. Access to breakout areas was strongly related to ease of communication, higher job satisfaction, and well-being. In the absence of breakout areas, employees with higher autonomy were able to better manage the challenges arising from contemporary offices. Practical implications include incorporating breakout areas to enhance employee experience within open-plan offices, using job design to optimize employee experience in open-plan offices, and manager and employee involvement in office design.