H2O and temperature measurements in propagating hydrogen/oxygen flames using a broadband swept-wavelength ECQCL.

We present experimental results using a swept-wavelength external cavity quantum cascade laser (swept-ECQCL) diagnostic to measure broadband absorption spectra over a range of 920-1180c m -1 (8.47-10.87 µm) with 2 ms temporal resolution in premixed hydrogen/oxygen flames propagating inside an enclosed chamber. Broadband spectral fits are used to determine time-resolved temperatures and column densities of H 2 O produced during combustion. Modeling of the flowfield within the test chamber under both equilibrium conditions and using a 1D freely propagating flame model is compared with the experiment in terms of temporal dynamics, temperatures, and H 2 O column density. Outputs from the numerical models were used to simulate radiative transport through an inhomogeneous combustion region and evaluate the performance of the spectral fitting model. Simulations show that probing hot-band H 2 O transitions in the high-temperature combustion regions minimizes errors due to spatial inhomogeneity. Good agreement is found between the experimental and modeling results considering experimental uncertainties and model assumptions.

Near-MHz temperature and H2O measurements in post-detonation fireballs of 25 g hemispherical explosives using scanned-wavelength-modulation spectroscopy.

A laser absorption spectroscopy diagnostic integrated within a hardened optical probe was used to measure temperature and water mole fraction at 500 kHz in post-detonation fireballs of explosives. In the experiments, an exploding-bridgewire detonator initiated a 25 g hemisphere of explosive (N5 or PETN). This produced a hemispherical fireball that traveled radially towards a hardened measurement probe. The probe contained a pressure transducer and optical equipment to pitch fiber-coupled laser light across a 12.6 cm gap onto a detector. Tunable diode lasers emitting near 7185.6 and 6806c m -1 were used to measure the absorbance spectrum of H 2 O utilizing peak-picking scanned-wavelength-modulation spectroscopy with a scan frequency of 500 kHz and modulation frequencies of 35 and 45.5 MHz, respectively. This enabled measurements of temperature and X H 2 O in the shock-heated air and trailing fireball at 500 kHz. Time histories of pressure, temperature, and H 2 O mole fraction were acquired at different standoff distances to quantify how the fireball evolved in space and time as well as to compare measured quantities between PETN and N5 fireballs. The standard deviation of temperature and X H 2 O during one representative test were found to be 17 K (1.3%) and 0.011 (5%), respectively. These measurements demonstrate this diagnostic's ability to provide rapid and reliable measurements in harsh, highly transient post-detonation environments produced by solid explosives.

Feasibility and Acceptability of a Group Counseling Intervention for Opioid Use Disorder: An Exploratory Study.

The goal of the current exploratory study was to examine the feasibility and acceptability of an evidence-based group counseling intervention for individuals with opioid use disorders (OUD) reporting mental health issues and using medications for OUD. The intervention combines motivational interviewing and cognitive-behavioral therapy. Qualitative research methodology, specifically focus group interviewing, with seven individuals was used to examine the feasibility and acceptability of the intervention. Qualitative analysis of the focus group yielded four themes: Intervention Format, Group Counseling Factors, Comorbid Mental Health Issues, and Counselor Factors. The intervention proposed was found to be acceptable and feasible for addressing OUD and co-occurring mental health conditions, specifically depression, anxiety, and stress. [Journal of Psychosocial Nursing and Mental Health Services, 60(6), 7-10.].

Feasibility and Acceptability of a Mindfulness-Based Relapse Prevention Intervention for Opioid Use Disorders.

In 2021, drug overdose deaths exceeded 100,000 for the first time in U.S. history, mostly attributable to opioid overdoses. Medications for opioid use disorders are considered the gold standard for treatment; however, treatment initiation and adherence remain a challenge. Mindfulness-based interventions show efficacy for substance use disorders, and peer support has been shown to improve treatment outcomes. The purpose of the current study was to examine the feasibility and acceptability of the Minds and Mentors Program. Enrollment, randomization, and retention rates were 36%, 49%, and 57%, respectively. Client satisfaction scores ranged from 84.4% to 100%. Approximately 64% of participants attended 10 of 12 treatment sessions, representing treatment adherence. Qualitative analysis revealed four main domains: Permission to Be Honest and Open, Applicability for Everyday Life, Hope Restored, and Changing the Way I Think. [Journal of Psychosocial Nursing and Mental Health Services, 60(3), 11-14.].

Spectral Emission Signatures from Cased High-Explosive Charges.

Spectroscopic signatures of cased high-explosive charge denotations are examined using emission spectroscopy with sub nanometer resolution. Eleven distinct case materials are investigated for atomic features of their major alloying elements. Molecular features of case material combustion products are also investigated for five case materials. Emission is monitored within the 275-425 nm range for atomic features and in the 310-755 nm range for molecular features. Major alloying elements with concentrations greater than 5% are generally detected through atomic emission. Al, Cu, Fe, Mg, Cr, Mn, Pb, and Ni are all detected in concentrations less than 5%. Undetected elements include Zn, Nb, Ta, and V. Molecular emission from aluminum monoxide, titanium monoxide, and CN is measured for aluminum alloy, titanium alloy, and carbon fiber cases, respectively.