Test results of a Stirling engine utilizing heat exchanger modules with an integral heat pipe

The Heat Pipe Stirling Engine (HP-1000), a free-piston Stirling engine incorporating three heat exchanger modules, each having a sodium filled heat pipe, has been tested at the NASA-Lewis Research Center as part of the Civil Space Technology Initiative (CSTI). The heat exchanger modules were designed to reduce the number of potential flow leak paths in the heat exchanger assembly and incorporate a heat pipe as the link between the heat source and the engine. An existing RE-1000 free-piston Stirling engine was modified to operate using the heat exchanger modules. This paper describes heat exchanger module and engine performance during baseline testing. Condenser temperature profiles, brake power, and efficiency are presented and discussed

GROWTH AND YIELD RESPONSES OF SOYA BEAN (Glycine max L.) TO VARYING SPACING IN JALINGO, TARABA STATE

A field experiment was carried out to study the effects of plant spacing on the growth and yield of soybeans (Glycine max L.), variety TGX 448-2E during 2016 cropping season at the Research farm of the Taraba State University, Jalingo. The experiment was laid out in a Randomized Complete Block Design (RCBD) having nine treatments replicated three times. Treatments included 5x30cm (T1), 5x45cm (T2), 5x60cm (T3), 10x30cm (T4), 10x45cm (T5), 10x60cm (T6), 15x30cm (T7), 15x45cm (T8) and 15x60cm (T9). Parameters monitored were plant height, number of leaves plant-1, number of days to 50% flowering, number of flowers plant-1, number of pods plant-1, number of seeds pod-1, number of seeds per plant-1 and total grain yield plot-1. Results of Analysis of Variance (ANOVA) of data collected revealed that plant height varied significantly (p˂0.05) with tallest plants (41.5cm) obtained with 5x30cm spacing and lowest with 10x45cm spacing. Number of leaves plant-1 was highest (19.4) with 15x60cm and lowest with 5x30cm spacings accordingly. Number of seeds pod-1 was similar in all inductive spacings. Number of seeds plant-1 varied significantly (p˂0.05) between the treatments with highest number of seeds obtained from the 15x30cm spacing. Total seed weight plot-1 was significantly (p˂0.05) highest with 5x45cm and 15x60cm spacings. These results showed that the plant spacings 5x45cm and 15x60cm which gave the highest yield may be recommended for the location for best yield

Extraperitoneal v Intraperitoneal Robotic Prostatectomy: Analysis of Operative Outcomes

Background and Purpose: Robotic prostatectomy can be performed either via an extra- or intraperitoneal approach. The extraperitoneal approach has advantages similar to those of an extraperitoneal open radical prostatectomy, but the potential disadvantages of a small working space. We report our experience using both approaches. Methods: From July 2003 to June 2004, 55 patients underwent a robot-assisted laparoscopic prostatectomy. During the first 6 months, 21 prostatectomies were performed using an intraperitoneal approach (group 1); 34 were performed using an extraperitoneal approach (group 2) during the next 6 months. Clinicopathologic parameters and perioperative complications were compared in both groups. All patients were categorized as intent-to-treat analysis. Results: Median surgery time was significantly shorter in the extraperitoneal compared with the intraperitoneal approach (3 hours and 34 minutes v 4 hours and 1 minute, respectively, P = 0.017). This was because of the shorter time interval between the skin incision and incision of the endopelvic fascia in the extraperitoneal v the intraperitoneal approach (55 minutes v 74 minutes, respectively, P < 0.0001). There was no significant difference in terms of patient age, clinical and pathologic stage, length of hospital stay, and perioperative complications between the two approaches. Conclusion: Extraperitoneal robot-assisted laparoscopic prostatectomy offers a similar clinical outcome as the intraperitoneal approach. However, the extraperitoneal approach avoids potential bowel injury or complications related to an intraperitoneal urine leak.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/63120/1/end.2007.9872.pd

Gambaran Darah Ayam Petelur Fase Grower (7--10 Minggu) pada Kepadatan Kandang Berbeda

The research aimed to determine the hematological profile (erythrocytes, leukocytes, andhemoglobin) of grower laying hens with different cage density and the best cage density. Thisresearch has been conducted in April 2014 using 210 grower laying hens 7--10 weeks in Varia AgungJaya Farm and Balai Veteriner Lampung. The treatment is given based on completely randomizeddesign (CRD), consisting of four treatments and five replications. The data was analyzed usinganalysis of variance on 5% significance level.The result of the research shows that the density of the cage 6,9,12, and 15 hens m-2 have notsignificant (P>0,05) on hematological profile (erythrocytes 1,04--2,74 x 106 mm-3; leukocytes 27,96--52,52 x 103 mm-3; and hemoglobin 6,40--8,20 g/dl)

Studying additional losses of standard g.652 optical fiber with protective cladding during multiple bending to develop weight control sensor

The article deals with developing an alternative to fiber-optic data transmission lines. One of the problems of telecommunication systems of the Republic of Kazakhstan operation is considered attenuation of signals in FTT data transmission systems. The main idea of using optical fiber of the G.652-656 standard, which is sufficiently sensitive to bends, has been described. Local enterprises have mastered the production of fiber-optic cables and patch cords based on the G.652 standard. Bending causes a loss of the light wave power, changes the phase of propagation of the mode and leads to signal attenuation, in which case users cannot work normally in the Internet. In this article, various types of microbends have been simulated. Microbending of a small radius optical fiber will damage it. This situation arises when the technology of installing a fiber-optic cable is violated. There have been carried out studies aimed at obtaining new scientific results related to the construction of characteristics of additional losses arising from the bending of an optical fiber depending on the number of angles, their degree and the wavelength of optical radiation. Conclusions have been drawn on the further use for the development of sensors based on the control of additional losses during microbending, as well as the development of systems for protecting information transmitted over fiber-optic lines. The studies are aimed at developing software for the numerical calculation of additional losses with an estimate of the accuracy of constructing an approximation according to the given parameters: the number of bends, the angle and wavelength of optical radiation propagating along the fiber core

Influence de la morphologie tridimensionnelle sur le comportement mécanique de réfractaires électrofondus

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