# Ultrapressure calorimetry experiments — section 4

## Passive gas-loaded calorimetry
Pages: Pressure report · pp. 254–269

Held palladium samples at 100 or 150 ksi, typically for at least four days, with a hydrogen-loaded control. Mature experiments produced stable heat-flow records without evidence of LENR.

## Cryogenic calorimetry
Pages: Pressure report · p. 269

Observed loaded palladium between −150 °C and −50 °C. Recorded heat-flow fluctuations tracked heater and cooling behavior; no unexplained excess heat was found.

## High-temperature holds
Pages: Pressure report · pp. 269–270

A smaller series reached 150–200 °C; operation at 200 °C used 100 ksi. No unexplained heat was observed. Pressure-vessel failures limited further testing with this calorimeter.

## Arata and related nanocomposites
Pages: Pressure report · pp. 219–233

Recreated gas-loading experiments using double-structure cells and nanoparticle materials. Fifteen anomalous-heat tests were negative.

## Case catalyst replications
Pages: Pressure report · pp. 233–239

Tested palladium-on-carbon catalysts in a Case-style apparatus and a differential calorimeter. Sixteen experiments did not reproduce the reported difference between hydrogen and deuterium.

## Controlled thermal inputs
Pages: Pressure report · pp. 270–274

Applied measured heat pulses to foils, wires, and particles, including cryogenic samples near full loading. Differential calorimetry found no excess heat.

## Pressure-assisted electrochemical calorimetry
Pages: Pressure report · pp. 274–278

Measured heat during electrolysis at 150–200 ksi, with stable-pressure intervals lasting 20–40 hours. Controls and energy accounting did not support a LENR heat signal.