Inventory ratios

Another indicator of a pharmacy manager s ability to manage the investment in inventory efficiently is the net-profit-to-average-inventory ratio. This ratio... 

Figure 7.9 Spatial distribution of 234Th in sediments in Mississippi River plume region showing that the highest inventory ratios are in close proximity to the river mouth. (Modified from Corbett et al., 2004.)...

Since the 1230 trajectory begins near the coast, we used station 76 (La Cienega Boulevard) measurements for 0630 hours (PST) initial values of nitrogen oxides. No hydrocarbon data were available from that station, and an HC/NOa.-ratio of 2 was chosen. Although this is not representative of the inventory ratio, it is representative of many morning air samples. Such an observation further reinforces the suspicion of an NOa,-deficiency on high oxidant days (37) thus, the values are... 

This penalty is mitigated to some extent by two factors first the TRU/heavy metal ratio is reduced in STAR designs compared to conventional breeders second, the required out of reactor to in-reactor working inventory ratio for a 20-year cycle is much less than for a 1-year cycle 3 batch core. 

The conversion capability of the PEACER was evaluated by applying simple indices of the overall fissile inventory ratio (FIR) and fissile gain (FG) ... 

Consider the following scenario. As the manager of inventory for your company, you are told to improve inventory effectiveness by your managing director. Because you are familiar with inventory ratios and performance measures, you do not ask any additional questions. You have identified and selected the following inventory ratios and perfor-... 

Time-Dependent Cascade Behavior. The period of time during which a cascade must be operated from start-up until the desired product material can be withdrawn is called the equiUbrium time of the cascade. The equiUbrium time of cascades utilizing processes having small values of a — 1 is a very important quantity. Often a cascade may prove to be quite impractical because of an excessively long equiUbrium time. An estimate of the equihbrium time of a cascade can be obtained from the ratio of the enriched inventory of desired component at steady state, JT, to the average net upward transport of desired component over the entire transient period from start-up to steady state, T . In equation form this definition can be written as... 

Althou a high current ratio is desirable, this may be achieved by having unnecessarily high inventories that bring no profit except when commodity prices are rising rapidly. The quick ratio is less misleading in this respect. 

Good management practice will hold inventories at the lowest possible levels consistent with customer satisfaction and efficient plant operation. Excessive inventories are unproductive and are an investment having httle or no rate of return. Excessive inventories should be maintained only when supphes are erratic or rising in price. Management should normally aim for a high inventoiy-turnover ratio, as given by ... 

We are now ready to calculate the mean residence time. According to Equation (1.41), f is the ratio of mass inventory to mass throughput. When the number of moles does not change, t is also the ratio of molar inventory to molar throughput. Denote the molar inventory (i.e., the total number of moles in the tube) as Nactimi- Then... 

Const ant-Pres sure Scaleups for Turbulent Flows in Tubes. Equation (3.34) gives the pressure drop ratio for large and small reactors when density is constant. Set AP2 = APi to obtain 1 = Equation (3.31) gives the inventory... 

The relative activity of americium isotopes for a typical pressurized-water reactor (PWR) fuel assembly are 1,700, 11, and 13 Ci for241 Am, 242Am, and 243Am (DOE 1999). The respective activity ratios for a typical boiling water reactor (BWR) are 680, 4.6, and 4.9 Ci. There are 78 PWR and 41 BWR reactors in the United States, several of which have ceased operation. Total projected inventories of these three radionuclides for all reactors are 2.3x10s, 1.4xl06, and 1.7xl06 Ci, respectively. The post irradiation americium content of typical PWR and BWR reactor fuel assemblies are 600 g (0.09%) and 220 g (0.07%), respectively. 

PEL Pg pmol PHS PMR ppb ppm ppt REL RfD RTECS sec SCE SIC SIR SMR STEL STORET TLV TSCA TRI TRS TWA u.s. UF yr WHO wk permissible exposure limit picogram picomole Public Health Service proportionate mortality ratio parts per billion parts per million parts per trillion recommended exposure limit Reference Dose Registry of Toxic Effects of Chemical Substances second sister chromatid exchange Standard Industrial Classification Standardized incidence ratio standard mortality ratio short term exposure limit STORAGE and RETRIEVAL threshold limit value Toxic Substances Control Act Toxics Release Inventory total reduced sulfur time-weighted average United States uncertainty factor year World Health Organization week... 

Fig. 11.9 Proton inventory on SrtA catalyzed reaction. The ratio of kcAT = KM (Section 11.2, Equations 11.9 through 11.13) measured in a D2O/H2O solvent mixture of mole fraction n D20 to that measured in H20(n = 0), is plotted vs. n (Frankel, B. A., et al. Biochemistry 44,11188 (2005))...

The fourth desorbent characteristic is that the desorbent material should be readily available (at a sustainable cost). It is important that the desorbent be readily available and not cost-prohibitive because desorbent is gradually lost during operations. Since the desorbent is separated from both the extract and raffinate components by fractionation, trace quantities (parts per million) of desorbent are present in the respective product streams due to fractionation tray efficiencies and fractionation control optimization of reflux to feed ratio. Ultimately, each n-paraffn separation facility must balance the operating expenses (utilities consumed during fractionation) to minimize desorbent loss against the replacement value of desorbent to maintain inventory. 

---