Effects of relative humidity conditions in the irradiation chamber and of temperature of the chamber on the response of 3 mm thick light blue poly (methyl methacrylate) sheets have been studied. The response was measured spectrophotometrically at 402, 450, 596 and 612 nm. The response of the dosimeter is independent of the relative humidity (12–97%) during irradiation if the response is measured within 24 h of irradiation. If the response is measured after longer storage time, the absorbance at 402 and 450 nm increases significantly. At these two wavelengths the response of the dosimeter is also independent of the temperature of the irradiation chamber in the range of 0 to 40 °C. However, at higher temperatures (60, 80 °C), the response is not uniform.
Authors:M. Odlyha, G. Foster, S. Hackney, and J. Townsend
The use of non-aqueous deacidification procedures as a preventive conservation measure to assist in retarding the deterioration
of painting canvases has been suggested by the Conservation Department of the Tate Gallery . The reverse sides of paintings
are treated with commercially available MMC solution (methoxy magnesium methyl carbonate). The aim of this paper is to describe
how dynamic mechanical thermal analysis can be used to evaluate the effects of this treatment. Measurements are described
on modern commercially primed canvas samples  which show that the MMC treatment does cause an increase in the modulus or
stiffness of the primed canvas materials but that the effect on theTg is minimal. The response of the treated materials to variations in relative humidity has also been studied and indications
are that the response of treated canvases to variations in relative humidity differs from those of the untreated canvases.
Authors:R. Filho, P. Franco, E. Conceição, and M. Leles
A formulation of nifedipine tablets was prepared in the present research. The tablets were conditioned in amber-colored glass
containers and placed in a climatized room at 40°C and relative humidity of 75% for 180 days. Differential scanning calorimetry
(DSC) and thermogravimetry (TG) were used in order to evaluate the thermal properties of nifedipine, the excipients and two
well-known nifedipine degradation products. The results demonstrated that there is no evidence on the interaction between
nifedipine and excipients, or degradation products.
Authors:Tadeusz Przylibski, Jakub Bartak, Elżbieta Kochowska, Lidia Fijałkowska-Lichwa, Krzysztof Kozak, and Jadwiga Mazur
The article presents new Polish probes SRDN-3, developed at the Institute of Nuclear Chemistry and Technology in Warsaw, equipped
with a semi-conductor detector used for continuous measurements of 222Rn activity concentration. Due to a relatively high lower detection limit, the device is dedicated for use in underground
spaces—caves, adits, mines, tourist routes in strongholds, pyramids, etc. Its structure allows for difficult conditions in
which the device is transported to the measurement site, as well as hard operating conditions caused chiefly by large ambient
relative humidity, reaching up to 100%. The authors present calibration results of these appliances, as well as the results
of their work in a cave and an adit in the Sudetes (SW Poland). After almost 2 years of working in difficult conditions, the
probes displayed high reliability. No defects of the semi-conductor detectors or the electronics were observed, which ensured
problem-free communication of the probe-programmer-PC set. Thanks to this, the authors have a 2 year stock of data, recorded
hourly by five probes, at their disposal. The only element that did not withstand the test of extreme operating conditions
was one of the combined relative humidity and temperature sensors. No powering problems were observed either, and the batteries
were replaced once a year, before the winter season. Also the programmer functioned faultlessly, enabling data transmission
to a PC, which, being much more sensitive to operating conditions, had been placed away from the site of probe exposure. After
using more sensitive temperature, relative humidity and pressure sensors, SRDN-3 probes will certainly prove an excellent
tool for microclimate measurements (including measurement of air-atmosphere exchange) in caves and other underground sites.
Even nowadays they are already a satisfactory tool for monitoring 222Rn concentration in underground spaces.
The use of dataloggers in food engineering is discussed in two examples. The first example describes the measurement of temperature and humidity in a bulk tank car during transport and unloading. In the case of wheat flour the relative humidity in the air raises from about 80% r.h. to values near 100% r.h. at the air compressors for pneumatical unloading start working. The second example shows the use of the datalogger in education on heat transfer. The device was fixed in an ice cream sample which was placed in a store at –25°C. The measured hardeningtime agrees well to theoretical heat transfer calculation.
Authors:T. Tahri, S. Abdul-Wahab, A. Bettahar, M. Douani, H. Al-Hinai, and Y. Al-Mulla
A theoretical model is developed in Part I of this study to simulate the physical process of condensation of the humid air
in the condenser of an existing seawater greenhouse that is located in Muscat, Oman. Application is conducted in this part
to validate the theoretical developments. Comparisons are made between the predictions and the existing experimental results.
The results indicate that the comparison is well consistent. The effect of the relative humidity, the dry bulb temperature
and the solar radiation are also discussed to see their effects on the condensate values.
The antihypertensive drug substance amlodipine besylate crystallizes in two stable crystal forms, an anhydrate and a hitherto
unknown monohydrate. Both forms have been characterized by thermal analysis, X-ray powder diffractometry, FTIR- and FT Raman
spectroscopy. Moisture sorption- and desorption investigations reveal their unusual physical stability in a broad range of
relative humidities. The monohydrate forms an isomorphic dehydrate upon dehydration, which was elucidated by variable temperature
X-ray powder diffractometry. Physico-chemical properties as well as relative stabilities of the crystal forms are described
and discussed based on a comprehensive analytical identification, and enable an estimation of practical relevance for manufacturing
of amlodipine besylate solid dosage forms.
Electronic microbalances, manufactured by CI Electronics Ltd., are used by numerous researchers to study processes and phenomena which can be followed by changes in the sample masses. Less sensitive electronic millibalances are incorporated into integrated systems for the quality control of small and valuable items such as pharmaceutical products and diamonds. A further application of microbalances is the automatic water sorption analysis of samples by the gravimetric method with the CISorp. This integrated system records kinetic and isotherm data of the changes in the relative humidity, sample masses, and temperature and allows the study of physical and chemical properties of sample surfaces.
Authors:M. Odlyha, N. Cohen, R. Campana, and G. Foster
This paper describes the results and conclusions of research directed towards the development and evaluation of a chemical
sensor which would provide information on the quality of indoor environments surrounding cultural objects. In our case these
objects were paintings housed in major European galleries and the main objective is their preservation through an improved
understanding of their microenvironment. The concept was to prepare and expose test tempera paintings which would behave as
dosimeters and integrate the environmental response at these locations. Artificial ageing of similar samples was performed
to provide a means of calibrating the test paintings. Samples from the test paintings were compared with artificially aged
samples and this enabled the sites to be ranked in terms of their suitability for exposure of cultural objects.
Additionally, novel methodology involving piezoelectric sensors was designed for monitoring the relative humidity and temperature
of the microenvironment of paintings. Dielectric techniques were also used for measuring the effect of relative humidity fluctuations
on artists' materials and novel non-invasive dielectric techniques in the microwave region were used for the determination
of their moisture content.
The stability of supersulphated cement (SSC) is investigated. The hydration products of cement pastes prepared at a water
cement ratio of 0.27 were determined by thermogravimetry (TG) and X-ray diffraction (XRD). Ettringite, one of the initial
hydration products, is shown to be stable under conditions of storage at 25, 50 and 75°C and when subject to relative humidities
of 100, 53 and 11% of water vapour in each case. The effect of drying on ettringite stability at the higher temperatures is
discussed in relation to the relative humidity.