2,109 research outputs found
A battery-operated, stabilized, high-energy pulsed electron gun for the production of rare gas excimers
We report on the design of a new type of electron gun to be used for
experiments of infrared emission spectroscopy of rare gas excimers. It is based
on a filament heated by means of a pack of rechargeable batteries floated atop
the high-voltage power supply. The filament current is controlled by a feedback
circuit including a superluminescent diode decoupled from the high voltage by
means of an optical fiber. Our experiment requires that the charge injection is
pulsed and constant and stable in time. This electron gun can deliver several
tens of nC per pulse of electrons of energy up to keV into the sample
cell. This new design eliminates ripples in the emission current and ensures up
to 12 hrs of stable performance.Comment: 1o pages, 8 figures, to be submitted to Review of Scientific
Instrument
Historical micronutrient psychiatry: descriptive analysis of patients with pellagra admitted to the “San Lazzaro” asylum in Reggio Emilia (Italy) in the decade 1901-1910
This study aims at describing the socio-demographic and clinical characteristics of the patients affected by pellagra and admitted to the “San Lazzaro” psychiatric asylum (Reggio Emilia, Italy) from 1901 to 1910 besides exploring possible gender differences for the collected information. Data were collected from the admission register and clinical records of those patients who were admitted to the San Lazzaro Psychiatric Hospital receiving a diagnosis of pellagra at their first admission. The pellagrous patient population was characterised by a higher rate of hospitalisation for women (64.3%) and the number of hospitalised patients suffering from pellagra gradually decreased from 1901 (78; 8.3%) to 1910 (8;0.7%). The most common profession for men admitted with pellagra was farmer/agricultural labourer, while most of the women were housewives. A characteristic shared by both the male and female population of inpatients was very high rate of illiteracy: only one patient was recorded as being able to read and write. The generic diagnosis of “mental illness from pellagra” was predominant (70%), while “dementia from pellagra” accounts for 17.85% of the admission diagnoses: no statistically significant differences between men and women were found in the frequency of diagnosis. Half of the patients, both men and women, died while being inpatients. This study confirms previous findings about the case mix of pellagra patients admitted to psychiatric hospital at the beginning of the last century in northern Italy and highlights the significance of the relationship of psychiatry with other medical disciplines and the sociocultural milieu
Validation of the Modena bleeding score in endoscopic sinus surgery
Introduction: The Modena bleeding score is a categorical rating scale that allows the assessment of the surgical field in relation to bleeding during endoscopic surgery. It has recently been presented and validated in the field of endoscopic ear surgery by the present authors. The Modena bleeding score provides five grades for rating the surgical field during endoscopic procedures (from grade 1 − no bleeding to grade 5 − bleeding that prevents every surgical procedure except those dedicated to bleeding control). Objective: The aim of this study was to validate the Modena bleeding score in the setting of endoscopic sinus surgery. Methods: Fifteen three-minute videos of endoscopic sinus surgery procedures (each containing three bleeding situations) were evaluated by 15 specialists, using the Modena bleeding score. Intra and inter-rater reliability were assessed, and the clinical validity of the Modena bleeding score was calculated using a referent standard. Results: The data analysis showed an intra-rater reliability ranging from 0.6336 to 0.861. The inter-rater reliability ranged from 0.676 to 0.844. The clinical validity was α = 0.70; confidence limits: 0.64 − 0.75, corresponding to substantial agreement. Conclusion: The Modena bleeding score is an effective method to score bleeding during endoscopic sinus surgery. Its application in future research could facilitate the performance and efficacy assessment of surgical techniques, materials or devices aimed to bleeding control during endoscopic sinus surgery
Can stigmatizing attitudes be prevented in psychology students?
Background: Stigmatizing attitudes have been found among psychology students in many studies, and they are becoming more common with time. Aims: This study examines whether participation in clinical psychology lessons reduces levels of stigmatization in a population of psychology students and whether it leads to any change in stigmatization. Methods: The study is a pre/post evaluation of the effectiveness of clinical psychology lessons (63 hours of lectures) as a tool to fight stigma. The presence of stigmatizing attitudes was detected using the Italian version of the Attribution Questionnaire-27 (AQ-27-I). Stigmatization was described before and after the lessons with structured equation modeling (SEM). Results: Of a total of 387 students contacted, 302 (78.04%) agreed to be involved in the study, but only 266 (68.73%) completed the questionnaires at both t0 and t1. A statistically significant reduction was seen in all six scales and the total score on the AQ-27-I. The models defined by the SEM (pre- and post-intervention) showed excellent model fit indices and described different dynamics of the phenomenon of stigma. Conclusions: A cycle of clinical psychology lessons can be a useful tool for reducing stigmatizing attitudes in a population of students seeking a psychology degree
Affective and sexual needs of residents in psychiatric facilities: A qualitative approach
Background: The affective and sexual needs of psychiatric patients are often under-considered, although they contribute significantly to their general well-being. Such topics are critical for Residential Psychiatric Facilities Users (RPFUs), whose daily life is paced by therapeutic settings. The aim of this paper is to better understand how sexuality and affectivity are expressed by the RPFUs at the Mental Health Department of Modena, within psychiatric residential settings. Methods: Adult RPFUs took part into two audio recorded focus groups. Digital transcripts were analyzed using MAXQDA software in order to perform qualitative narrative analysis, so as to develop a hierarchical code system a posteriori (derived from the data). Results: Eleven participants (eight RPFUs and three investigators) attended the first focus group, and eight participants (5 RPFUs and 3 investigators) attended the second focus group. 175 interventions were analyzed and coded under seven thematic areas: (a) contraception and sexually transmitted disease prevention (N = 17); (b) affective needs (N = 11); (c) personal experiences (N = 61); (d) regulation of sexual relations (N = 18); (e) Mental Health Professionals' (MHPs) openness towards the topic (N = 17); (f) MHPs' responses to RPFUs' sexual behaviors (N = 33); and (g) RPFUs proposals (N = 18). The highlighted topics suggest that affective and sexual relations commonly occur within residential psychiatric facilities, even if mental health services often fail to recognize and address RPFUs' affective and sexual needs as well as to provide effective solutions to manage them. Conclusions: RPFUs expressed a request for support to fulfill their affective and sexual needs and dedicated spaces for sexual activities to relieve their discomfort, while MHPs highlighted a need for awareness, training, and shared problem-solving strategies
Observed Limits on Charge Exchange Contributions to the Diffuse X-ray Background
We present a high resolution spectrum of the diffuse X-ray background from
0.1 to 1 keV for a ~1 region of the sky centered at l=90, b=+60 using a
36-pixel array of microcalorimeters flown on a sounding rocket. With an energy
resolution of 11 eV FWHM below 1 keV, the spectrum's observed line ratios help
separate charge exchange contributions originating within the heliosphere from
thermal emission of hot gas in the interstellar medium. The X-ray sensitivity
below 1 keV was reduced by about a factor of four from contamination that
occurred early in the flight, limiting the significance of the results. The
observed centroid of helium-like O VII is 568+2-3 eV at 90% confidence. Since
the centroid expected for thermal emission is 568.4 eV while for charge
exchange is 564.2 eV, thermal emission appears to dominate for this line
complex, consistent with much of the high-latitude O VII emission originating
in 2-3 x 10^6 K gas in the Galactic halo. On the other hand, the observed ratio
of C VI Ly gamma to Ly alpha is 0.3+-0.2. The expected ratios are 0.04 for
thermal emission and 0.24 for charge exchange, indicating that charge exchange
must contribute strongly to this line and therefore potentially to the rest of
the ROSAT R12 band usually associated with 10^6 K emission from the Local Hot
Bubble. The limited statistics of this experiment and systematic uncertainties
due to the contamination require only >32% thermal emission for O VII and >20%
from charge exchange for C VI at the 90% confidence level. An experimental gold
coating on the silicon substrate of the array greatly reduced extraneous
signals induced on nearby pixels from cosmic rays passing through the
substrate, reducing the triggered event rate by a factor of 15 from a previous
flight of the instrument.Comment: 14 pages, 7 figures, to be published in Ap
Irrational beliefs about COVID-19: A scoping review
Since the emergence of the recent Coronavirus Disease of 2019 (COVID-19) and its spread as a pandemic, there has been a parallel spread of false and misleading information, known as an infodemic. The COVID-19 infodemic has induced distrust in scientific communities, governments, institutions and the population, and a confidence crisis that has led to harmful health behaviours, also impacting on mental health. The aim of this study is to provide a scoping review of the scientific literature about COVID-19-related misinformation and conspiracy theories, focusing on the construction of a conceptual framework which is useful for the interpretation of the conspiracy theory phenomenon surrounding COVID-19, and its consequences. Particular socio-environmental conditions (i.e., low educational level, younger age), psychological processes and attitudes (such as low levels of epistemic trust, the avoidance of uncertainty, extraversion, collective narcissism, and a conspiracy-prone mindset), and contextual factors (e.g., high levels of self-perceived risk and anxiety) seem to underpin the adherence to beliefs that are not solely the domain of paranoids and extremists but a widespread phenomenon that has caused important health, social and political consequences
A novel experimental approach for the detection of the dynamic Casimir effect
The Casimir effect is a well-known macroscopic consequence of quantum vacuum
fluctuations, but whereas the static effect (Casimir force) has long been
observed experimentally, the dynamic Casimir effect is up to now undetected.
From an experimental viewpoint a possible detection would imply the vibration
of a mirror at gigahertz frequencies. Mechanical motions at such frequencies
turn out to be technically unfeasible. Here we present a different experimental
scheme where mechanical motions are avoided, and the results of laboratory
tests showing that the scheme is practically feasible. We think that at present
this approach gives the only possibility of detecting this phenomenon.Comment: Submitted to the Physical Review Letters. RevTeX. 4 pages, 2 figure
Diagnostic agreement between physicians and a consultation-liaison psychiatry team at a general hospital: An exploratory study across 20 years of referrals
Consultation-liaison psychiatry (CLP) manages psychiatric care for patients admitted to a general hospital (GH) for somatic reasons. We evaluated patterns in psychiatric morbidity, reasons for referral and diagnostic concordance between referring doctors and CL psychiatrists. Referrals over the course of 20 years (2000-2019) made by the CLP Service at Modena GH (Italy) were retrospectively analyzed. Cohen\u2019s kappa statistics were used to estimate the agreement between the diagnoses made by CL psychiatrist and the diagnoses considered by the referring doctors. The analyses covered 18,888 referrals. The most common referral reason was suspicion of depression (n = 4937; 32.3%), followed by agitation (n = 1534; 10.0%). Psychiatric diagnoses were established for 13,883 (73.8%) referrals. Fair agreement was found for depressive disorders (kappa = 0.281) and for delirium (kappa = 0.342), which increased for anxiety comorbid depression (kappa = 0.305) and hyperkinetic delirium (kappa = 0.504). Moderate agreement was found for alcohol or substance abuse (kappa = 0.574). Referring doctors correctly recognized psychiatric conditions due to their exogenous etiology or clear clinical signs; in addition, the presence of positive symptoms (such as panic or agitation) increased diagnostic concordance. Close daily collaboration between CL psychiatrists and GH doctors lead to improvements in the ability to properly detect comorbid psychiatric conditions
Testing the neutrality of matter by acoustic means in a spherical resonator
New measurements to test the neutrality of matter by acoustic means are
reported. The apparatus is based on a spherical capacitor filled with gaseous
SF excited by an oscillating electric field. The apparatus has been
calibrated measuring the electric polarizability. Assuming charge conservation
in the decay of the neutron, the experiment gives a limit of
for the electron-proton charge
difference, the same limit holding for the charge of the neutron. Previous
measurements are critically reviewed and found incorrect: the present result is
the best limit obtained with this technique
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