The influence of particle(s) size, shape and distribution on cake filtration mechanics—a short review

The filtration properties in solid–liquid separation mainly depend upon the filter cake properties, for instance, cake resistance. However, particle size distribution, particle shape, and their arrangements significantly impact cake filtration. This paper aims to review the work done so far and collate both fundamental and applied work with regard to the quantification of cake properties. The cake resistance and cake porosity in terms of shape, as well as varying particle size distribution width, are discussed here. This work summarizes the current state of the technology and recommends advancements and improvements for future research

The influence of particle(s) size, shape and distribution on cake filtration mechanics—a short review

The filtration properties in solid–liquid separation mainly depend upon the filter cake properties, for instance, cake resistance. However, particle size distribution, particle shape, and their arrangements significantly impact cake filtration. This paper aims to review the work done so far and collate both fundamental and applied work with regard to the quantification of cake properties. The cake resistance and cake porosity in terms of shape, as well as varying particle size distribution width, are discussed here. This work summarizes the current state of the technology and recommends advancements and improvements for future research

Evaluation of the drug solubility and rush ageing on drug release performance of various model drugs from the modified release polyethylene oxide matrix tablets

Hydrophilic matrix systems are currently some of the most widely used drug delivery systems for controlled-release oral dosage forms. Amongst a variety of polymers, polyethylene oxide (PEO) is considered an important material used in pharmaceutical formulations. As PEO is sensitive to thermal oxidation, it is susceptible to free radical oxidative attack. The aim of this study was to investigate the stability of PEO based formulations containing different model drugs with different water solubility, namely propranolol HCl, theophylline and zonisamide. Both polyox matrices 750 and 303 grade were used as model carriers for the manufacture of tablets stored at 40 °C. The results of the present study suggest that the drug release from the matrix was affected by the length of storage conditions, solubility of drugs and the molecular weight of the polymers. Generally, increased drug release rates were prevalent in soluble drug formulations (propranolol) when stored at the elevated temperature (40 °C). In contrast, it was not observed with semi soluble (theophylline) and poorly soluble (zonisamide) drugs especially when formulated with PEO 303 polymer. This indicates that the main parameters controlling the drug release from fresh polyox matrices are the solubility of the drug in the dissolution medium and the molecular weight of the polymer. DSC traces indicated that that there was a big difference in the enthalpy and melting points of fresh and aged PEO samples containing propranolol, whereas the melting point of the aged polyox samples containing theophylline and zonisamide was unaffected

Improvements in Yarn Quality from Short-staple Cottons by Modifications in Top Arm Drafting System

53-57<span style="font-size:11.0pt;line-height:115%; font-family:" calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-fareast-font-family:="" calibri;mso-fareast-theme-font:minor-latin;mso-hansi-theme-font:minor-latin;="" mso-bidi-font-family:arial;mso-ansi-language:en-us;mso-fareast-language:en-us;="" mso-bidi-language:ar-sa"="">Appropriate modifications in the cradles, nose bars and slides of top arm drafting were made at ring frame so as to obtain front bottom roller setting of 40 mm as against 44 mm in the normal drafting system. Initial studies at pilot plant showed a significant and consistent reduction in Uster U% and imperfections for coarse count yarns spun from short staple cottons. A range of yarn counts spun from two input hanks and a range of ring frame drafts showed a consistently lower level of U% and imperfections with modified drafting in all counts. Yarns spun on modified drafting system with higher ring frame draft were compared for Uster U% and imperfections with yarns spun on normal drafting system with lower ring frame draft. The variance draft line lay at a higher level with normal system as compared to modified system. Mill level studies confirmed the improvement in yarn imperfections and showed a significant reduction in B.C. winding breaks as a result of modifications.</span

Evaluation of alteration in serum lipid levels in patients with chronic periodontitis postperiodontal therapy

Aim: There is growing evidence that periodontitis may affect general health. This study was assigned to explore changes in cholesterol levels following nonsurgical periodontal therapy in patients with chronic periodontitis. Materials and methods: Periodontal parameters and lipid profile (total cholesterol, high-density lipoprotein, low-density lipoprotein, triglycerides and very low-density lipoprotein) were evaluated in 50 subjects suffering from moderate to severe generalized chronic periodontitis. Results: At third month, there was significant reduction in total cholesterol, low density lipoprotein, very low density lipoprotein, triglyceride and increase in high density lipoprotein after nonsurgical periodontal therapy (NSPT). Also, the reduction in bleeding on probing, pocket depth and attachment level were statistically significant in the treatment group. Conclusion: The results of our study showed that periodontal destruction and serum lipid levels are positively correlated and nonsurgical periodontal treatment in chronic periodontitis patients resulted in significant changes in the concentration of total cholesterol, triglycerides, HDL. LDL levels in blood serum

Predicting Native American Students’ Future Intentions to Pursue Environmental Science.

Measurements of science self-efficacy, interests, barriers and supports, and future intentions to pursue science

Deconvolution of auditory evoked potentials obtained at high stimulus rates

High stimulation rate acquisition of Auditory Brainstem and Middle Latency Responses is accomplished using a newly developed time-domain technique, Continuous Loop Averaging Deconvolution (CLAD). Unlike previously developed deconvolution methods, CLAD provides the capability to generate a large variety of stimulation sequences. Data was acquired from 4 ears at 6 stimulation rates from 58.6 to 507.8 per second and intensity levels from 70 to 0 dB HL. The selected CLAD sequences generated good quality recordings with the most important peak components being discernible. As expected, the higher stimulation rates and lower stimulation intensities produced peaks with prolonged latencies and lower amplitudes. The developed technique provides a valuable tool for stress testing the auditory system function at very high stimulation rates