NaOH

A great deal of research has been conducted in the last few decades to study and understand the dynamics of stress, its causes and its relationships with many other variables like performance and satisfaction et. This paper attempts to provide a conceptual framework of stress that includes major approaches and theories of stress that provide a basis for understanding stress from various perspectives. A compilation of inputs from various researchers regarding stress is also included and an attempt has been made to highlight prominent structural frameworks defined over the years and their usefulness for further empiricalresearch. The most importantresults and basisfor new research are discussed

In this study, the potentiality of Bangladesh zircon as a raw material for zirconia and zircon brick production was examined. Decomposition of zircon (ZrSiO4) into zirconia (ZrO2) was attempted by using caustic soda (NaOH) as the decomposition agent. 5-10 μm size zircon, 5-30 wt.% NaOH, and decomposition temperatures ranging from 1300 to 1500°C were investigated. X-ray diffraction method using Mo Kα radiation was used in order to find out the extent of decomposition of zircon into zirconia. Zircon bricks of 0.06 mm× 0.06 mm× 0.025 mm shaped were made under a pressure of 15 MPa. Carboxi methyal cellulose (CMC) and Fe2O 3 were used as a binder. With increasing temperature and percentage of NaOH, decomposition of zircon increases. Crushing strengths and density of these bricks could be found as high as 53.36 MPa and 3210 kg/m3, respectively. Bangladesh zircon can be used successfully for preparation of refractory bricks for high temperature use.

http://www.sciencedirect.com/science/article/pii/S092401360500909X

The processes of aluminum degradation in HCl, H 2 SO 4 , HNO 3 and NaOH solutions were investigated in static and agitated media. The effects of concentration, temperature, and mixture of acids were studied. The dissolution of aluminum was faster in NaOH and HCl than in H 2 SO 4 and HNO 3. The activation energies were 86.5 and 52.4 kJ/mol for Al dissolved in HCl and NaOH respectively. An inhibiting effect on Al dissolution was observed with the mixture HCl + HNO 3 regardless of the conditions used while a syner-getic effect was observed with the mixture H 2 SO 4 + HCl using acids at 4 M.

Reducing CO2 emissions for addressing climate change concerns is becoming increasingly important as the CO2 concentration in
the atmosphere has increased rapidly since the industrial revolution. Carbon capture and storage is the process of capturing waste
carbon dioxide (CO2) from large point sources, such as fossil fuel power plants, transporting it to a storage site, and depositing it
where it will not enter the atmosphere, normally an underground geological formation. The aim is to prevent the release of large
quantities of CO2 into atmosphere. This paper aims at manufacturing of a simple and useful unit of capture the carbon dioxide.
The air with carbon dioxide is made to flow through the reaction chamber using an axial flow fan and NaOH is sprayed using a
nozzle. The NaOH reacts with CO2 and form Na2CO3, and is collected in a tray. The maximum absorption rate of CO2 is found to
be at NaOH solution molar concentration of 5.

— NaOH, H 2 O 2 and NaOH/H 2 O 2 treatment methods were investigated to eliminate the lignin and hemicellulose distributed in the lignocellulosic matrix of rice husk. In order to prevent the decomposition of H 2 O 2 at higher temperatures, a low temperature treatment for 4 hours has been performed. A composition analysis indicated that NaOH/H 2 O 2 may achieve the highest concentration of α-cellulose, but had the lowest overall solid recovery rate. Both FTIR and TGA results confirmed that only the H 2 O 2 treated rice husk contained hemicellulose residue, which could be found at the absorption peak 1740 cm-1. The TGA analysis demonstrated the NaOH/H 2 O 2 modified rice husks presented the most uniform structure. The SEM gave a clear picture of the raw rice husks and modified rice husks.

This study was performed to investigate the effect of fermentation by Bacillus subtilis (B. subtilis) and Aspergillus niger (A. niger) and alkaline processing on the nutritional value and chemical composition of date palm kernels (DPK). DPK was fermented for 28 days under solid-state fermentation culture with two different microorganisms (B. subtilis and, or A. niger). Alkaline processing was performed by soaking DPK in NaOH solution for 24 hours. In this experiment, eight treatments were used: DPK (control), DPK fermented by B. subtilis, and A. niger separately or in combination, and processed with NaOH, alone or with B. subtilis or A. niger or both. Digestibility and gas production of fermented and processed DPK were performed using batch culture and gas production techniques. The results showed that there was an increase in crude protein (CP) and a decrease in crude fiber concentrations due to the fermentation of DPK with B. subtilis and A. niger (P<0.05). Total phenol content...

This study was performed to investigate the effect of fermentation by Bacillus subtilis (B. subtilis) and Aspergillus niger (A. niger) and alkaline processing on the nutritional value and chemical composition of date palm kernels (DPK). DPK was fermented for 28 days under solid-state fermentation culture with two different microorganisms (B. subtilis and, or A. niger). Alkaline processing was performed by soaking DPK in NaOH solution for 24 hours. In this experiment, eight treatments were used: DPK (control), DPK fermented by B. subtilis, and A. niger separately or in combination, and processed with NaOH, alone or with B. subtilis or A. niger or both. Digestibility and gas production of fermented and processed DPK were performed using batch culture and gas production techniques. The results showed that there was an increase in crude protein (CP) and a decrease in crude fiber concentrations due to the fermentation of DPK with B. subtilis and A. niger (P<0.05). Total phenol content in fermented DPK (FDPK) with B. subtilis and A. niger was significantly lower than the control. Gas production significantly increased in FDPK compared to control and NaOH-treated samples (P<0.05). All treatments significantly increased the in vitro digestibility of DM (IVDOD) and OM (IVOMD) compared to the control (P<0.01). Among the treatments, simultaneous fermentation of DPK with B. subtilis and A. niger had the most significant effect on increasing the microbial CP (MCP) and its efficiency (EMCP; P<0.01).