Study on dry-sliding wear (DSW) of uncoated IN800 super alloy and sol-gel based dip coated IN800 substrate

631-642In the present paper, sliding wear characteristics of seven weight% yttria stabilized zirconia (7YSZ) sol-gel deposited on to air plasma sprayed CoNiCrAlY bond-coated Inconel 800 superalloy has been studied. For this, sliding wear tests have performed on pin-on-disc friction and wear test rig by varying experimental parameters applied load, sliding velocity, disc speed and temperature as per L16 orthogonal arrays of Taguchi. Taguchi method has been used to perform experiments to know the effect of interaction of variables on dry sliding wear behavior. The optimal experimental parameters have been obtained by orthogonal arrays, signal-to-noise ratio (SNR) and analysis of variance (ANOVA) for uncoated and coated Inconel 800 superalloy substrate. Results have shown temperature as the most influencing parameter for uncoated samples and coated samples, both. However, compared with coated samples, applied load has been found significant factor for uncoated samples. It has been exhibited better wear resistance in the sol-gel derived YSZ coated surface of IN800 superallloy substrate

Study on dry-sliding wear (DSW) of uncoated IN800 super alloy and sol-gel based dip coated IN800 substrate

In the present paper, sliding wear characteristics of seven weight% yttria stabilized zirconia (7YSZ) sol-gel depositedon to air plasma sprayed CoNiCrAlY bond-coated Inconel 800 superalloy has been studied. For this, sliding wear tests haveperformed on pin-on-disc friction and wear test rig by varying experimental parameters applied load, sliding velocity, discspeed and temperature as per L16 orthogonal arrays of Taguchi. Taguchi method has been used to perform experiments toknow the effect of interaction of variables on dry sliding wear behavior. The optimal experimental parameters have beenobtained by orthogonal arrays, signal-to-noise ratio (SNR) and analysis of variance (ANOVA) for uncoated and coatedInconel 800 superalloy substrate. Results have shown temperature as the most influencing parameter for uncoated samplesand coated samples, both. However, compared with coated samples, applied load has been found significant factor foruncoated samples. It has been exhibited better wear resistance in the sol-gel derived YSZ coated surface of IN800superallloy substrate

The optical counterpart to gamma-ray burst GRB970228 observed using the Hubble Space Telescope

Although more than 2,000 astronomical gamma-ray bursts (GRBs) have been detected, and numerous models proposed to explain their occurrence, they have remained enigmatic owing to the lack of an obvious counterpart at other wavelengths. The recent ground-based detection of a transient source in the vicinity of GRB 970228 may therefore have provided a breakthrough. The optical counterpart appears to be embedded in an extended source which, if a galaxy as has been suggested, would lend weight to those models that place GRBs at cosmological distances. Here we report the observations using the Hubble Space Telescope of the transient counterpart and extended source 26 and 39 days after the initial gamma-ray outburst. We find that the counterpart has faded since the initial detection (and continues to fade), but the extended source exhibits no significant change in brightness between the two dates of observations reported here. The size and apparent constancy between the two epochs of HST observations imply that it is extragalactic, but its faintness makes a definitive statement about its nature difficult. Nevertheless, the decay profile of the transient source is consistent with a popular impulsive-fireball model, which assumes a merger between two neutron stars in a distant galaxy.Comment: 11 pages + 2 figures. To appear in Nature (29 May 1997 issue

Growth, density, and biomass of grasshoppers in the shortgrass and mixed-grass associations

June 1973.On cover: Grassland Biome, Ecosystem analysis studies, U.S. International Biological Program.Includes bibliographical references (pages 97-101)

Stage IB cervix cancer with nodal involvement treated with primary surgery or primary radiotherapy: patterns of failure and outcomes in a contemporary population

IntroductionThe purpose of this study is to evaluate patterns of failure, overall survival (OS), disease-free survival (DFS), prognostic factors and late toxicities in node positive International Federation of Gynaecology and Obstetrics (FIGO) stage IB cervix cancer treated with curative intent

Tailoring adjuvant radiotherapy in endometrial cancer

Objectives: The aim of this study was to examine the patterns of failure following adjuvant radiotherapy in patients with endometrial cancer according to: (a) the extent of the disease present at the time of primary surgery, (b) according to risk groups as agreed upon in the ESMO–ESGO–ESTRO consensus conference on endometrial cancer (Colombo et al. in Int J Gynecol Cancer Off J Int Gynecol Cancer Soc 26:2–30, 2016). Methods and Materials: One thousand two hundred and seven newly diagnosed endometrial cancer patients with endometrioid/serous, clear cell and serous histology, treated by primary surgery and presented to The Peter MacCallum Cancer Centre, between January 1996 and December 2014 for adjuvant radiotherapy, were analysed for patterns of any failure to study the efficacy of adjuvant radiotherapy. Results: Nine hundred and eight (75%) patients were alive at the last observation date, 826 without any evidence of disease. Two hundred and sixty-one patients have died, 147 (12%) from recurrent cancer. The median follow-up time was 5.4\ua0years. 53% patients had LVSI, and 18% patients had positive nodes. 19% patients developed metastases. Pelvic, para-aortic and distant relapses were observed in 13, 11 and 8.5%, respectively. Conclusion: Vaginal vault brachytherapy was a very efficient form of radiotherapy that provided 99% control of disease at the vaginal vault in intermediate- and high-intermediate-risk patients in FIGO stages 1 and 2. In stage 3 and 4 patient, adjuvant pelvic radiotherapy and extended field radiotherapy provided a good pelvic and para-aortic control. Patients with lymphovascular space invasion recur more diffusely and at multi-sites

Carcinoma of the cervix in elderly patients treated with radiotherapy: patterns of care and treatment outcomes

Objective: The aim of this analysis was to examine the management of cervix cancer in elderly patients referred for radiotherapy and the results of treatment in terms of overall survival (OS), relapse-free survival (RFS), and treatment-related toxicities