Redistribution of dopant impurities in a semiconductor using the series method of Chen and Chen

The series method of Chen and Chen is re-examined and applied to a variety of redistribution problems. It is seen that this analysis can play an important role in deriving closed-form solutions of the diffusion equation useful in semiconductor technology. In particular, series solutions are formulated for two alternative Si/SiO₂ interface boundary conditions. Moreover, taken in conjunction with the Euler transformation it is shown to provide exact solutions to several redistribution problems for a wide class of initial dopant profiles and for realistic diffusion times. All solutions have been compared where ever possible with existing analytical techniques, and in all other cases reference has been made to results obtained from the numerical Crank-Nicolson technique.     

Experimental and Theoretical Assessment of Multipath Effects on QPSK

Qualitative and quantitative agreement between experimental and theoretical results for binary error probability for a coherent QPSK system degraded by intersymbol interference is given. The source of intersymbol interference is a delayed and attenuated replica of the transmitted signal which may represent several forms of observed multipath. Although the experimental results pertain to a particular 1 Gbit/s modem, the theory is applicable for any data rate.     

Postprandial biliary and pancreatic secretion during profound inhibition of gastric secretion in humans

This study assessed the effect of profound inhibition of gastric secretion by an H2 antagonist on postprandial gastric emptying of acid and chyme, and on bile acid and pancreatic enzyme secretion under physiological conditions in humans. Six subjects were studied before and while they were given famotidine (40 mg). This study combined a continuous intestinal perfusion technique using 14C-polyethylene glycol (14C-PEG) as duodenal recovery marker, with intermittent sampling of gastric content using PEG 4000 as meal marker. During the three hour study, the area under the curve for gastric acid output decreased from mean (SEM) 88.9 (7.6) mmol for those not receiving treatment, to 21.2 (2.7) mmol for subjects receiving famotidine (p < 0.01). The corresponding values for the rate of acid delivery into the duodenum decreased from 65.2 (11.9) to 16.6 (2.9) mmol (p < 0.05), and those for the rate of gastric emptying of chyme remained unchanged for the group receiving no treatment and during famotidine (1040 (200) v 985 (160) ml respectively, NS). Duodenal bile acid and trypsin output remained unchanged (area under the curve, 457 (128) v 373 (86) umol/kg and 5022 (565) v 5058 (400) IU/kg respectively, NS) receiving no treatment and during famotidine. It is concluded that profound inhibition of postprandial gastric acid secretion by anti-secretory drugs is not accompanied by changes in biliary and pancreatic secretion, mainly because the gastric emptying of chyme is unaffected.     

Simultaneous systemic lupus erythematosus and dermatitis herpetiformis

The binding in vitro of the sodium salts of cholic acid, chenodeoxycholic acid, deoxycholic acid, taurocholic acid, taurochenodeoxycholic acid, taurodeoxycholic acid, glycocholic acid, glycochenodeoxycholic acid, and glycodeoxycholic acid by alfalfa, bran, cellulose, lignin, and cholestyramine was measured. Cholestyramine bound an average of 81.3% of all the bile acids and salts tested whereas cellulose bound only negligible amounts (1.4%). Of the other substances tested, lignin bound 29.2%, alfalfa, 15.9% and bran, 9.0%. No distinct pattern of binding was discerned. It is therefore apparent that the validity of statements concerning the effect of fiber on bile salf metabolism rests upon the specificity of the composition of the fiber involved and the bile acids or salts tested.     

Automated Barchart Construction

The task of work sequencing and assignment of personnel is generally done manually. The need for a system which can reduce this overhead cost and provide work plans (barcharts) having improved manpower utilization has been recognized for many years. This article describes a technique developed for use as a computer system of “Automated Barchart Construction” (ABC). This system improves the effectiveness of the industrial engineering analyst by reducing the analyst effort required to produce and maintain barcharts and providing new barcharts soon after job planning is complete which reflect an improved manpower utilization.     

Urinary bladder organ culture with a continuous nutrient system]

From the differences in radiation profiles between 131I and 125I isotopes of iodine it would be expected that they would show different effects on thyroid function. The differences should lead to lower rates of thyroid gland destruction with 125I and hence less post-irradiation hypothyroidism. This difference in biological effect has been demonstrated in rats by indirect assessment of thyroid function. In this report the long-term effects of a range of similar doses of 131I and 125I were compared, in male and female rats, by direct assessment of thyroid function. Seventeen months after receiving 25 and 125 muCi of 131I, male and female rats showed significant elevation of serum TSH concentration and a reduction in 3 h radioiodine uptake. Rats receiving 1 and 5 muCi of 131I and all doses of 125I showed no significant changes in thyroid function. These findings confirm the previously reported differences in effect between the 131I and 125I isotopes of iodine in the rat.     

Emotional reactions to surgery.

Evaluated the stress effects of major surgery on 26 white male patients. The State-Trait Anxiety Inventory (STAI) and Kincannon's Mini-Mult version of the MMPI were given 18-24 hr. before surgery and 3-9 days postsurgery after the S was informed he was recovering without complications. Mean STAI A-State scores were much higher prior to surgery than after; STAI A-Trait scores were essentially the same. Patients with high- and low-A-Trait scores showed similar presurgery-postsurgery changes in A-State. Scores on the Mini-Mult were essentially unchanged by the stresses associated with surgery. Results indicate that the threat of imminent surgery produced elevations in anxiety as an emotional state, but did not affect anxiety proneness (A-Trait). (27 ref.) (PsycINFO Database Record (c) 2010 APA, all rights reserved)