Invisible Lenses Research Articles

Gender as Perspective: The On-going Psychoanalytic Privilege of the Penis

ABSTRACT Psychoanalysis requires a rigorous assessment of the implications of gender in our theories and practice. There are two parts to this problem: one is a lack of recognition about gender and gender difference that has already been produced in psychoanalytic theorizing; the other is the insidious life of sexism on an unconscious level. I contend that current construction of psychoanalytic theories, particularly subjectivity, is marked by and depends upon profoundly problematic assumptions about gender, subjectivity, and knowledge itself. This problem might be reduced to an unacknowledged male perspective, or what I call masculinism. Masculinist perspective is an invisible lens that presents a wholly gendered and subjective experience as objective reality. A brief summary of a few feminist theories is presented, as well as speculation about the persistent resistance to gender discourse and a need to analyze that resistance. Most psychoanalytic theories fail to recognize this unconscious privilege of the penis which underlies our understanding of human nature and the impact it has on our lives.

Comparative Features of Electromagnetic Scattering by an Invisible Spherically Symmetric Lens with a Negative Refractive Index

A spherically symmetric lens with a negative refractive index, which can be invisible from the point of view of geometrical optics, is considered. Expressions describing the profile of the refractive index and ray trajectories in the lens, as well as some results of numerical modeling of plane wave scattering by the lens in the rigorous statement of the problem, are presented. It is detected that, unlike in the case of an invisible lens with a positive refractive index, the minima of the radar cross section in the forward direction corresponding to invisibility for the lens with a negative index occur at integer, rather than semi-integer, values of the electric radius, and that their depth is smaller because of the astigmatism associated with focusing of rays on the axis. Some results characterizing influence of losses in the lens on the level of the radar cross-section minima are also presented.

Invisible omnidirectional lens for flexural waves in thin elastic plates

A feasible approach is proposed in this work to realize an acoustic omnidirectional invisible lens for flexural waves in thin elastic plates. These devices require extreme values of the refractive index close to its center, and in this work this drawback is overcome by reducing gradually the thickness of the elastic plate, which has the same effect as increasing proportionally the refractive index. Although ideally the thickness of the plate should be zero at the central point, it is shown that a finite but small minimum thickness is enough to provide a good invisibility effect. Numerical simulations are performed by the finite element method, which supports the theoretical predictions, showing that an invisible lens is feasible for flexural waves.

Photonic crystals composed of Eaton lenses and invisible lenses

A densely arranged grid of absolute optical instruments, namely Eaton and invisible lenses, provides a photonic crystal with properties that are the opposite of its tiny constituents. The band structure of the photonic crystal dictates the wavelengths that are reflected or transmitted.

Scattering of waves by the invisible lens

We investigate the scattering properties of the invisible lens in two ways. First, we describe the scattering of electromagnetic waves by the invisible lens realised by a purely dielectric, purely magnetic, and impedance-matched medium, respectively, using Debye potentials. Second, we employ the Wentzel–Kramers–Brillouin method to analyse the scattering of scalar waves by the lens. We show that in all cases the scattering is negligible for a discrete set of frequencies, while for other frequencies there is a phase slip at the boundary of the lens ‘shadow’.

Visual defects when extending two-dimensional invisible lenses with circular symmetry into the third-dimension

A common practice in the design of three-dimensional objects with transformation optics is to first design a two-dimensional object and then to simply extend the refractive index profile along the z-axis. For lenses that are transformations of free space, this technique works perfectly, but for many lenses that seem like they would work, this technique causes optical distortions. In this paper, we analyze two such cases, the invisible sphere and Eaton lens, and show photorealistically how serious such optical distortions might appear in practice.

Exploring the Impact of Culture- and Language-Influenced Physics on Science Attitude Enhancement

“Culture,” a set of principles that trace and familiarize human beings within their existential realities, may provide an invisible lens through which reality could be discerned. Critically explored in this study is how culture- and language-sensitive curriculum materials in physics improve Pangasinan learners’ attitude toward science. Their cultural preference or profile defined their cultural dimensions, epistemological beliefs, and views on integration of culture and language in the teaching and learning processes. The culture- and language-influenced curriculum materials in physics were heavily influenced by Pangasinan learners’ cultural preference or profile. Results of the experimental participants’ pretest and posttest on science attitude measure, when compared, showed significant statistical difference. Assessment of science attitude enhancement favored the experimental group over the control group. Qualitative data gathered from postimplementation interviews, focus group discussions, and journal log entries indicated the same trend in favor of the experimental participants. The study yielded that culture and language integration in the teaching and learning processes of physics concepts allowed students to develop positive attitude to science, their culture, and native language.

Invisible lenses with positive isotropic refractive index

We analyze the optical properties of the so-called invisible lenses in the wave-optics regime and show that they are practically invisible for a discrete set of frequencies. For other frequencies, the phase delay of the waves that pass through the lens compared to those that do not disturbs the outgoing waves. The frequencies for which the lens is invisible are influenced by the Gouy phase. This is the only known invisible device made of positive isotropic material at finite frequencies.

Why Identity Group Work Strengthens Our Capacity for All Liberation Work

Why Identity Group Work Strengthens Our Capacity for All Liberation Work

Racial Ideology and Discourse in the NBA

This paper examines white spectatorship of the black athlete's body through an analysis of NBA basketball player Ron Artest's 2004 suspension. In examining the discourse surrounding the event, there emerges a covert ideology of simultaneous idealization and denigration of black athletes. While most in the sports world would claim to be colour-blind when evaluating talent or watching a game, the discourse surrounding Artest and the NBA in general seems to suggest that the invisible lens of white superiority shapes the perceptions of sports fans when viewing a predominantly black sport such as professional basketball.

FITTING OF CONTACT LENSES FOR PERSONS WITH AMETROPIA

Because of recent developments which have added to the comfort of the patient and the widespread publicity given to this new device for correcting ametropia, contact lenses deserve the careful and thorough consideration of the ophthalmologist. He will be asked many times in the near future the uses to which these invisible lenses may be put, the comfort with which they may be worn, the chance of injury through breakage, how long they have been used, how they work, what chance there is for irritation, how they are inserted and removed and other questions which only the ingenuity of a patient aroused by curiosity could conceive. Contact lenses, while originally designed to correct keratoconus, have been suggested and used for many conditions other than that for which they were principally intended. They have been used as a protective covering for the cornea in cases of entropion, trichiasis, keratitis e lagophtalmo,