Sub-THz wireless transmission based on graphene-integrated optoelectronic mixer

Optoelectronics is a valuable solution to scale up wireless links frequency to sub-THz in the next generation antenna systems and networks. Here, we propose a low-power consumption, small footprint building block for 6 G and 5 G new radio wireless transmission allowing broadband capacity (e.g., 10-100 Gb/s per link and beyond). We demonstrate a wireless datalink based on graphene, reaching setup limited sub-THz carrier frequency and multi-Gbit/s data rate. Our device consists of a graphene-based integrated optoelectronic mixer capable of mixing an optically generated reference oscillator approaching 100 GHz, with a baseband electrical signal. We report >96 GHz optoelectronic bandwidth and -44 dB upconversion efficiency with a footprint significantly smaller than those of state-of-the-art photonic transmitters (i.e., <0.1 mm2). These results are enabled by an integrated-photonic technology based on wafer-scale high-mobility graphene and pave the way towards the development of optoelectronics-based arrayed-antennas for millimeter-wave technology.

In the same boat? An online group career counseling with a group of young adults in the time of COVID-19

An online group of career counseling for unemployed young adults during the COVID-19 pandemic was developed. Twelve participants were involved in online group career counseling intervention, based on the Life Design for an inclusive and sustainable future. Results indicated at post-test on increased scores on career adaptability, resilience, future orientation, and propensity to identify inclusive and sustainable actions for the future than pre-test. Overall, the online group career counseling intervention effectively promoted particular aspects of young adults' life design for an inclusive e-sustainable future.

Photo thermal effect graphene detector featuring 105 Gbit s-1 NRZ and 120 Gbit s-1 PAM4 direct detection

One of the main challenges of next generation optical communication is to increase the available bandwidth while reducing the size, cost and power consumption of photonic integrated circuits. Graphene has been recently proposed to be integrated with silicon photonics to meet these goals because of its high mobility, fast carrier dynamics and ultra-broadband optical properties. We focus on graphene photodetectors for high speed datacom and telecom applications based on the photo-thermo-electric effect, allowing for direct optical power to voltage conversion, zero dark current, and ultra-fast operation. We report on a chemical vapour deposition graphene photodetector based on the photo-thermoelectric effect, integrated on a silicon waveguide, providing frequency response >65 GHz and optimized to be interfaced to a 50 Ω voltage amplifier for direct voltage amplification. We demonstrate a system test leading to direct detection of 105 Gbit s^-1 non-return to zero and 120 Gbit s^-1 4-level pulse amplitude modulation optical signals.

Ideas and thoughts of Italian teachers on the professional future of persons with disability

BACKGROUND

The literature places special focus on the quality of life (QoL) of individuals with disability and on their self-determination and social and work participation. The field of vocational guidance also considers the satisfaction these individuals experience concerning their future crucial to their QoL. At the same time, however, persons with disability are at great risk of not making highly advantageous choices for their future. Hence, teachers and career counsellors can play an important role in vocational guidance for persons with disability.

METHODS

The present study was aimed at investigating the ideas of a group of teachers asked to describe in writing the future of hypothetical students with disability. Their descriptions were first analysed to verify whether any reference was made to the construct of QoL and whether a significant role was attributed to aspects of work inclusion and work satisfaction. Response category differences were then compared for curricular teachers vs. specialised teachers, elementary school teachers vs. middle school teachers, and low self-efficacy vs. high self-efficacy teachers.

RESULTS

Teachers describing the future of a hypothetical student with Down's syndrome mentioned some aspects of QoL and emphasised certain features over others. Several category type differences teachers emerged, although not always in line with expectations.

CONCLUSIONS

Teachers' ideas on the future of individuals with intellectual disability are characterised by a certain bias towards the restrictions that impairment can imply. In consideration of our findings, the need for training actions is highlighted.

Self-determination, social abilities and the quality of life of people with intellectual disability

BACKGROUND

The international literature has documented that self-determination is impacted by environmental factors, including living or work settings; and by intraindividual factors, including intelligence level, age, gender, social skills and adaptive behaviour. In addition, self-determination has been correlated with improved quality of life (QoL). This study sought to contribute to the growing literature base in this area by examining the relationship among and between personal characteristics, self-determination, social abilities and the environmental living situations of people with intellectual disabilities (ID).

METHODS

The study involved 141 people with ID residing in Italy. Healthcare professionals and social workers who had known participants for at least 1 year completed measures of self-determination, QoL and social skills. Analysis of variance was conducted to verify whether different levels of intellectual impairment were associated with different degrees of the dependent variables. The Pearson product-moment correlation was used to examine any relationships among dependent variables and IQ scores. Finally, discriminant function analysis was used to examine the degree to which IQ score, age, self-determination and social abilities predicted membership in groups that were formed based on living arrangement, and on QoL status (high vs. low).

RESULTS

The anova determined, as expected, that participants with more severe ID showed the lowest levels of self-determination, QoL and social abilities. Discriminant function analysis showed that (a) individuals attending day centres were distinguished from those living in institutions in that they were younger and showed greater autonomy of choice and self-determination in their daily activities; (b) basic social skills and IQ score predicted membership in the high or low QoL groups; and (c) the IQ score predicted membership in the high or low self-determination groups. A manova conducted to examine gender- and age-level differences on self-determination found gender differences; women had higher self-determination scores than men.

CONCLUSIONS

These findings contribute to an emerging knowledge base pertaining to the role of intraindividual and environmental factors in self-determination and QoL. In general, the study replicated findings pertaining to the relative contribution of intelligence to self-determination and QoL, added information about the potential contribution of social abilities, and pointed to the potentially important role of opportunities to make choices as a particularly important aspect of becoming more self-determined, at least in the context of residential settings.

Quality of life in adults with an intellectual disability: the Evaluation of Quality of Life Instrument

BACKGROUND

The construct of quality of life (QoL) has been the focus of a great deal of recent research and has been operationalized in the assessment of the effectiveness of biomedical and rehabilitative interventions. Consequently, the effective measurement of QoL has become a relevant issue. QoL assessment should take account of both objective life conditions and reported satisfaction with those conditions, and should recognize that QoL has multiple domains. There is also evidence to suggest that it is useful to supplement such assessments with the evaluations of significant others within a multidimensional assessment perspective.

METHODS

The current study describes a further stage of testing and refinement of the Evaluation of Quality of Life Instrument (EQLI), which was designed to elicit from staff of health and social care services assessments of the level of satisfaction experienced by adults with an intellectual disability. Specifically, the EQLI's internal consistency, and construct, convergent and discriminant validity were analysed.

RESULTS

The EQLI appears to be a psychometrically valid measure for collecting data on the levels of satisfaction which, according to health and social services staff, might be experienced by individuals with an intellectual disability who attend residential institutions and community-based day centres. The factor analyses supported a three-factor structure for the EQLI and reliability estimates of scores on the three factors were in the moderate to high range. The data collected supported convergent and discriminant validity.

CONCLUSIONS

The results indicate that the EQLI is an effective measure for gaining staff perceptions of individuals who may be at risk of dissatisfaction with various QoL domains. The EQLI is as an instrument which, within a multidimensional assessment, could contribute to the identification of areas of user dissatisfaction with services.

Observations on the visual-perceptual abilities and adaptive behavior in adults with Down syndrome

In this research, we consider some psychological, social, and clinical implications of premature aging in persons with Down syndrome (DS). Perceptual and adaptive tests contribute to a better knowledge of the characteristics of mental decline and self-government in DS adults. Visual-perceptual abilities (as measured by the Frosting Development Test of Visual Perception) and behavioral and social adaptation (measured by the Brown Adaptive Behavioral Inventory) were examined in 44 DS subjects aged 14 to 43 years. The results indicated a general decline in performance in the older groups (over 25 years), except in the visual-motor subtest, where a decline is less evident, as this ability continues to be exercised in craft work. Statistical analysis indicates a significant correlation between perceptual abilities, adaptive scales, and mental age. From the data collected, we draw some general conclusions about the trend of perceptual abilities and self-government in relation to aging in DS persons.

Remembering spatial locations: effects of material and intelligence

The aim of the present work was to test some of the criteria for automaticity of spatial-location coding claimed by Hasher and Zacks, particularly individual differences (as intelligence invariance) and effortful encoding strategies. Two groups of subjects, 15 with mental retardation (Down Syndrome, mean chronological age, 20.9 yr.; mean mental age, 11.6 yr.) and 15 normal children (mean age, 11.5 yr.), were administered four kinds of stimuli (pictures, concrete words, nonsense pictures, and abstract words) at one location on a card. Subsequently, subjects were presented the items on the card's centre and were required to place the items in their original locations. Analysis indicated that those with Down Syndrome scored lower than normal children on the four tasks and that stimuli were better or worse remembered according to their characteristics, e.g., their imaginability. Results do not support some of the conditions claimed to be necessary criteria for automaticity in the recall of spatial locations as stated by Hasher and Zacks.