• Fibers and Polymers
• /
• v.5 no.2
• /
• pp.145-150
• /
• 2004

Blends of poly(phenylene sulfide) (PPS) and polyethylene, either linear low density polyethylene (LLDPE) or metallocene-catalyzed polyethylene (MPE), that were prepared by melt blending, were investigated. From the rheological properties as determined by capillary rheometry, the melt viscosity of both PPS/LLDPE and PPS/MPE blends was low when PE was in dispersed phase, but high melt viscosity was observed for both blends with PPS in dispersed phase. Significant differences depending on the composition were found in the mechanical properties such as percent elongation at break and notched Izod impact strength. In addition, dispersed phase morphology of the blends was analyzed by a scanning electron microscope (SEM), together with brief discussion about the difference between them.

• Journal of Sericultural and Entomological Science
• /
• v.18 no.2
• /
• pp.79-81
• /
• 1976

Experiments on the disinfection of the silkworm larvae by the application of Neo-PPS fumigation have been carried out for the control of virus diseases. The results obtained are summarized as follows. The disinfection of 2, 4 and 6 hours'fumigation with Neo-PPS (para-formaldehyde) showed an outstanding effect on the inactivation of the both viruses, nuclear polyhedrosis virus and cytoplasmic polyhedrosis virus, without significance in the 2. 4. and 6 hours' treatment.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 1998.06a
• /
• pp.223-226
• /
• 1998

In this paper, we have investigated how morphology and electrical properties in Polyphenylene sulfide(PPS) are changed by uniaxial elongation. XRD pattern shows that interplanar distance and crystallinities are decreased by increasing elongation ratio. Electrical conduction mechanism of PPS is explained as schottky emission from analysis of electrical current. The electrical current is decreased by increasing elongation ratio. The conductivity is changed remarkably above the glass transition temperature around $(82^{\circ}C)$. The band gap of PPS is evaluated as 3.9-4(eV) from the results of photoconductivity. Increarnent of elongation ratio gives us some information about deep trap formation from photocurrent.

• Journal of the Korea Safety Management & Science
• /
• v.7 no.2
• /
• pp.95-106
• /
• 2005

Many Korean companies are challenged to reduce logistics cost and meet environmental-friendly logistics. The textile companies in harsh competition are requested to make improvement on their logistics environment to cut down the total cost. However, they have reached the limit on improving the manufacturing process. We believe that the logistics department is the most improvable part at present. Improving logistics will be highly effective to cut down the total cost. In this study, we present Pad Pool System(PPS) as the solution to save their logistics cost. PPS, which means the shared use of Styrofoam pads, will enable the textile companies to cut down their cost and strengthen enterprise competitiveness. Also, PPS will be helpful reducing environmental disruption because the system reuses retrieved Styrofoam pads many times.

• Journal of Microbiology and Biotechnology
• /
• v.18 no.3
• /
• pp.560-567
• /
• 2008

An efficient method to produce water-soluble polysaccharides from Lentinus lepideus is described. The productivity of both endopolysaccharides (PPS) and exopolysaccharides (EPS) was compared under various culture conditions. The effect of treating their own PPS and EPS on immune cytokine production was also studied in relation to culture factors. High yield production of EPS required a moderate culture temperature $(25^{\circ}C)$ as well as long culture period (16-20 days). In contrast, PPS production required a high culture temperature $(30^{\circ}C)$ and short culture period (8 days). Most of the carbon sources did not affect polysaccharides and mycelial production except for sucrose. Immune cytokine levels in the EPS treatment varied among carbon sources or culture periods. PPS did not appear to affect much on the production of cytokines, regardless of the culturing factors, except for the culture period. These results suggest that the optimal culture conditions for L. lepideus vary according to culture purposes, and different culture conditions should be used for different targets including mycelial biomass, EPS, and PPS. Whereas the immunomodulating activitiy of EPS appeared to be affected by culture conditions in L. lepideus, that of PPS did not.

• Asian-Australasian Journal of Animal Sciences
• /
• v.5 no.3
• /
• pp.549-558
• /
• 1992

The study on the potential use of pigeon pea (PP) as a ruminant feed was carried out with sheep in 3 experiments. Digestibility of dry pigeon pea leaves (PPL) and pigeon pea seeds (PPS) determined by differential and regression methods respectively, with rice straw (RS) as a basal diet, revealed that PPS contained higher nutritive value and palatability than PPL. On dry matter (DM) basis, PPL and PPS contained 19.8 and 20.0% CP, 7.3 and 2.3% EE, 6.0 and 4.4% ash, 61.1 and 51.7% NDF, and 29.4 and 17.5% ADF, respectively. The trypsin inhibitor activity in the seed was 3 times of that in the leaves (19.5 vs 7.0 mg TIA/g DM). The digestibility of PPL and PPS were 50.2 and 72.2% in DM, 52.7 and 73.3% in OM, 51.0 and 65.1% in CP respectively. DM intake as well as the digestibility of most nutrients increased with the increasing level of PPS. Digestible energy (DE), Total digestible nutrient (TDN) and N-balance of sheep fed solely PPS, estimated by regression method, was 3.2 kcal/g, 71.1% and 6.3 g/d respectively. Pigeon pea seeds can be well used to substitute soybean meal in concentrate rations for ruminants or directly supplemented to low quality roughages.

• 한국신재생에너지학회:학술대회논문집
• /
• 2011.05a
• /
• pp.89.2-89.2
• /
• 2011

Stainless steel bipolar plates have many advantage such as high electrical conductivity and mechanical strength and low fabrication cost. However, they need a passivation layer due to low corrosion resistance under PEM fuel cell operation condition. In this study, polyphenyene sulfide(PPS)/carbon composite coated stainless steel bipolar plates were fabricated by compression molding method after PPS/carbon composite sprayed on the stainless steel plate. PPS and carbon were chosen as the binder and conductive filler of passivation layer, respectively. The interfacial contact resistance and corrosion resistance of PPS/carbon composite coated stainless steel bipolar plates were investigated and compared to the stainless steel. The PPS/carbon composite coated stainless steel compared to stainless steel was improved interfacial contact resistance. The results of the potentiodynamic and potentiostatic measurements also showed that the PPS/carbon composite coated stainless steel did not corroded under PEM fuel cell operating conditions.

• Journal of Sericultural and Entomological Science
• /
• v.24 no.1
• /
• pp.25-27
• /
• 1982

The use of fumigation of Neo-PPS was tested for the larval disinfection and at the same time for easy handling and effective chemicals for larval disinfection. The results obtained are as follows: 1. There was no decrease of cocoon yield in spring season due to chemical damage by application of Neo-PPS fumigation to the disinfection of the silkworm except 2,4 and 6 hours' treatment everyday and 6 hours'/ twice/instar treatment as compared with the control. 2. There was no significance in pupal percent between treatments and control in spring season except 6 hours' treatment everyday. 3. No chemical damage seemed to give rise to percentage of cocoon shell in all treatments.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
• /
• v.28 no.10
• /
• pp.636-641
• /
• 2015

In this study, the partial discharge degradation properties for 2-core PVC cable($2cores{\times}1.5mm^2$ cross section, length of 10 cm, 20 cm, 30 cm) following immersion with the salt water that the 2%, 4%, 8% of NaCl is dissolved in 100 g of distilled water for 48 and 96 hours has been measured. The results of this study are as follows. When the degradation time in salt water of 2% NaCl is 48 hours, it found that the number of partial discharge increased as about 40 pps, 50 pps, 90 pps with increasing the length of cable to 10 cm, 20 cm, 30 cm. In case the concentration and degradation time is same, the inception and extinction voltage decreased with increasing the length of cable. When the degradation time in salt water is 96 hours and the length of cable is 20 cm, it found that the number of partial discharge decreased as 3,000 pps, 500 pps, 100 pps with increasing the concentration of NaCl to 2%, 4%, 8%.

• Journal of Preventive Medicine and Public Health
• /
• v.27 no.1 s.45
• /
• pp.107-116
• /
• 1994

The United States adopted DRG based prospective payment system (PPS) in order to control the inflation of health care costs. No study used statistical test while many studies reported the cost containing effect of the PPS. To study impacts of the PPS on the Medicare expenditure, this study set the following three hypotheses (1) The PPS decelerated the increase in the hospital expenditure (Part A), (2) the PPS accelerated the increase in the expenditure of outpatients and physicians (Part B), (3) the increase in total expenditure was decelerated inspite of the spill over (substitution) effect because saving in the Part A expenditure were greater than losses in the Part B expenditure. The dependent variables are per capita hospital expenditure, per capita Part B expenditure, and per capita total expenditure for the Medicare beneficiaries. An intervention analysis, which added intervention effect to the time series variation on the Box-Jenkins model, was used. The observations included 120 months from 1978 to 1987. The results are as follows : (1) The annual increase in the per capita Part A expenditure was $5.11 after the implementation of DRG where as that before the PPS had been $11.1. The effect of the reduction ($5.99) was statistically significient (t=-3.9). (2) The spill over (substitution) effect existed because the annual increase in the per capita Part B expenditure was accelerated by $1.73 (t=1.91) after the implementation of the PPS. (3) The increase in the total Medicare expenditure per capita was reduced by $4.26 (t=-2.19) because the spill over effect was less than cost savings in the Part A expenditure.