88,448 research outputs found
felt tack
No full textfeltsee SWAB JAN 1976Used I and SupNot usedNot usedsee SWABFelt tack appears to have the same meaning as "felt tins" in DNE-Su
Tack in Rubber
No full textAbstract
The expressions tack, tackiness, and stickiness have been in use since the beginning of the rubber industry. During the years their meaning has changed considerably. The first occasion where tackiness was mentioned was in the case of crude natural rubber. The surface of the rubber became tacky or sticky during storage. This phenomenon has been thoroughly discussed in the literature. As a general conclusion it was accepted that both oxidation and depolymerisation occurred. Three factors were reported to be the cause of these processes: light, traces of copper, and manganese. From our point of view we would call this effect stickiness, as we are only interested in the building tack of rubber. In the period when the only rubber was natural rubber and high loadings of highly active fillers were not generally used in compounds, building tack was no problem. Building tack was first mentioned in a publication by Griffith and Jones in 1928. They started their experiments by measuring tack in their search for methods to prevent cotton liners from sticking to unvulcanized rubber. One would have expected much work on the measurement and improvement of tack in Germany and Russia during the development of synthetic rubbers. However, this only proved to be the case in Russia. The first publication available was the translation of an article by Voyutskii and Margolina in 1957. From Voyutskii's work we were able to trace the first article in 1935 by Zhukov and Talmud, who studied the adhesive power of synthetic rubber. In the USA the first theoretical approach to the subject was by Josefowitz and Mark in 1942, who at that time did not realize the difference between stickiness and tack. This difference became clear when lack of tack became the big problem in the use of synthetic rubber. In many cases it was found that addition of resins and softeners gave a very sticky compound which had no building tack at all. The tack problem was first discussed at the ASTM symposium on the application of synthetic rubbers in 1944 by Juve who gave a definition of building tack. From that time, the problem has been studied regularly, especially from the practical side, to find ways and means to improve the building tack of synthetic rubbers.</jats:p
The TACK knee prosthesis. Analysis of a uniform case series
No full textWe implanted the total arthroplasty knee or TACK prosthesis in 40 patients with degenerative osteoarthritis. We used the same surgical technique in all patients. Full extension and flexion more than 90 were achieved in all 40 knees. All patients obtained a HSS score of more than 88 points.
The results confirm that the TACK prosthesis provides excellent results in patients with degenerative osteoarthritis
if there is no significant bone loss, serious ligament laxity or extensive deformatio
Exercise in Women with the Metabolic Syndrome. Molecular mechanisms of exercise-induced changes in insulin resistance and vascular structure
No full textContains fulltext :
131643.pdf (Publisher’s version ) (Open Access)Radboud Universiteit Nijmegen, 21 november 2014Promotores : Hopman, M.T.E., Tack, C.J.J. Co-promotor : Lammers, G
Investigation of the behavior of asphalt tack coat interface layer.
No full textState Project 736-99-1028LTRC Project 00-2BAsphalt tack coat is a light application of asphalt, usually asphalt diluted with water. It ensures a bond between the surface being paved and the overlying course by providing increased shear strength between two interfaces. Normally hot asphalt cements, emulsified asphalts or cutback asphalts are used as tack coat. The objective of this study was to evaluate the practice of using tack coats through controlled laboratory simple shear tests and determine the optimum application rate. The influence of tack coat types, application rates, and test temperatures on the interface shear strength was examined. Six emulsions (CRS-2P, CRS-2L, SS-1, CSS-1, SS-1h and SS-1L) and two asphalt binders (PG 64-22 and PG 76-22M) were selected as tack coat materials. The residual application rates considered were 0.00 l/sq m (0.00 gal/sq yd), 0.09 l/sq m (0.02 gal/sq yd), 0.23 l/sq m (0.05 gal/sq yd), 0.45 l/sq m (0.1 gal/sq yd), and 0.9 l/sq m (0.2 gal/sq yd). A simple shear test was performed to determine the shear strength at the interface at two test temperatures, 25 deg C (77 deg F) and 55 deg C (131 deg F). The influence of vertical load levels on interface bonding strength was evaluated using the optimum tack coat material and application rate. Based on the statistical analysis of the interface bond strengths provided by various tack coat types at different application rates, both CRS-2P and CRS-2L were identified as the optimum tack coat types among the eight tack coats considered in this study. The preliminary test results indicated that CRS-2P emulsion provided the highest interface bond strength at the test temperature of 25 deg C (77 deg F) whereas CRS-2L provided the highest interface bond strength at the test temperature of 55 deg C (131 deg F), both at an optimum residual application of 0.09 l/sq m(0.02 gal/sq yd). In addition, it was found that shear resistance at the interface increased significantly with an increase in vertical load and decreased with an increase in temperature
Influence of asphalt tack coat materials on interface shear strength
No full textAsphalt tack coat is a light application of asphalt, usually diluted with water. It is used to ensure a bond between the surface being paved and the overlying course. Normally, hot asphalt cements, emulsified asphalts, or cutback asphalts are used as tack coats. The objective of this study was to evaluate the practice of using tack coats through controlled laboratory simple shear tests and determine the optimum application rate. The influence of tack coat types, application rates, and test temperatures on the interface shear strength was examined. Four emulsions (CRS 2P, SS-1, CSS-1, and SS-1h) and two asphalt binders (PG 64-22 and PG 76-22M) were selected as tack coat materials. The residual application rates considered were 0.00 (0.00), 0.09 (0.02), 0.23 (0.05), 0.45 (0.1), and 0.9 (0.2) L/m2 (gal/yd2). A simple shear test was performed to determine the shear strength at the interface at two test temperatures, 25°C (77°F) and 55°C (131°F). The results indicated that CRS-2P emulsion was the best tack coat type and 0.09 L/m2 (0.02 gal/yd2) was the optimum application rate at which a maximum interface shear strength was measured for both test temperatures
Kajian Pengaruh Air Terhadap Kekuatan Geser Tack Coat Pada Perkerasan Lentur
No full textPenelitian ini membahas setting time pada variasi komposisi campuran tack coat akibat pengaruh air yang memberikan nilai kuat geser yang maksimum serta bagaimana hubungan antara setting time pengaruh air terhadap kuat geser tack coat pada masing-masing variasi campuran tack coat dan besaran sebaran yang memberikan kekuatan geser maksimum. Material yang digunakan adalah aspal dengan penetrasi 60/70 dan minyak tanah produksi Pertamina. Material campuran aspal AC- WC (Asphalt Cement - Wearing Course) diambil dari base camp PT. Multi Struktur di desa Kema kabupaten Minahasa Utara. Spesifikasi bahan campuran perkerasan lentur menggunakan Job Mix Design PT. Sinar Terang Lestari dengan kadar aspal optimum 6,0%. Pengujian dilakukan di laboratorium uji bahan Politeknik Negeri Manado. Benda uji perkerasan lentur dicetak dalam bentuk briket berukuran diameter 4 inci dengan jenis perkerasan AC - WC (Asphalt Cement - Wearing Course). Benda uji dibuat sebayak 480 buah dibagi dalam dua macam yaitu: benda uji melalui proses aging sebagai lapisan perkerasan lama, dibuat sebanyak 240 buah benda uji. Benda uji melalui proses overlay sebagai lapisan perkerasan baru, dibuat sebanyak 240 buah benda uji. Pengujian menggunakan alat uji geser langsung yang dimodifikasi pada penggerak geser manual menjadi penggerak geser electromotor. Pengujian yang dilakukan berupa pengukuran kuat geser tack coat yang didasarkan pada variasi setting time (15, 30, 45, 60, 75, 90, 105, 120, 135, 150 menit), variasi campuran tack coat (25, 30, 35, 45 pph) serta besaran takaran sebaran tack coat ( 0,25 ; 0,30 ; 0,35 ; 0,45 ltr/m²). Hasil penelitian menunjukkan bahwa sampai dengan batas waktu curing time tertentu, kekuatan geser yang dihasilkan oleh tack coat terhadap lapis beraspal akan meningkat sejalan dengan lamanya curing time, setelah itu kekuatan geser tack coat akan menurun. Pengaruh air hujan pada lapisan tack coat dari bahan pengencer medium curing cutback penetrasi 60/70 didapat setting time terjadi pada 135 menit dimana kekuatan geser yang terjadi akibat pengaruh air hujan masih lebih besar dari tahanan geser minimum (250kg) lapisan tack coat tanpa pengaruh air. Curing time terhadap kekuatan geser tack coat terbesar terjadi pada variasi tack coat 30 pph dengan kekuatan geser sebesar 375,567kg. Besar sebaran takaran tack coat akibat pengaruh air hujan yang memberikan nilai kekuatan geser terbesar untuk perkerasan lentur dicapai pada variasi tack coat 30 pph pada takaran 0,35 ltr/m2 dengan berat 2,8 gram. Metode pengujian kekuatan geser tack coat dengan alat uji geser langsung pada penelitian ini dapat digunakan untuk pengukuran kekuatan geser tack coat pada perkerasan lentur
Tack of Butyl and Natural Rubbers
No full textAbstract
A comparative study of the tack of Butyl and natural rubbers was made by contacting freshly cut surfaces of the compounds under various time-temperature-pressure conditions and measuring the force required to separate the splice. The temperature of the knife used to cut the samples was found to be of primary importance. The tack of Butyl compounded with 50 parts of semireën-forcing carbon black (no curatives) decreases regularly with increasing knife temperature. Both longer time and higher pressure of contact favor better splicing. Data are presented on the effect of various plasticizers and carbon blacks on the tack of Butyl compounds.</jats:p
Effect of the GLP-1 analog liraglutide on satiation and gastric sensorimotor function during nutrient-drink ingestion.
No full textBackground/Aim:Liraglutide, a glucagon-like peptide-1 analog, induces weight loss. We investigated whether liraglutide affects gastric accommodation and satiation by measuring the intragastric pressure (IGP) during nutrient-drink consumption and using the barostat technique.Methods:Ten healthy volunteers (HVs) were tested after placebo, 0.3, 0.6 or 1.2 mg liraglutide administration. IGP was studied during intragastric nutrient-drink (1.5 kcal ml(-1)) infusion (60 ml min(-1)), while the HVs scored their satiation on a graded scale until maximal satiation. In a separate session, isobaric distentions were performed using the barostat with stepwise increments of 2 mm Hg starting from minimal distending pressure, although HVs scored their perception; gastric volume was monitored 30 min before and until 60 min after ingestion of 200 ml of nutrient drink. Data are presented as mean±s.e.m. comparisons were performed with ANOVA (P<0.05 was significant).Results:During nutrient-drink infusion, IGP decreased with 4.1±0.7, 3.0±0.4, 2.1±0.3 and 2.6±0.4 mm Hg (placebo, 0.3, 0.6 and 1.2 mg liraglutide, respectively; P<0.05). The maximum-tolerated volume was not different, except after treatment with 1.2 mg liraglutide (695±135 ml) compared with placebo (1008±197 ml; P<0.05); however, 1.2 mg liraglutide induced nausea in all volunteers. In the barostat study, liraglutide did not affect the perception or compliance, but significantly decreased gastric accommodation to the meal (168±27 vs 78.8±36.4 ml after treatment with placebo and 0.6 mg liraglutide, respectively; P<0.05).Conclusion:Although no effect on perception, compliance or satiation was observed, liraglutide inhibited gastric accommodation. Whether this effect is involved in the anorectic effect of liraglutide remains to be determined
Review article: a comparison of glucagon-like peptides 1 and 2.
No full textBACKGROUND: Recent advancements in understanding the roles and functions of glucagon-like peptide 1 (GLP-1) and 2 (GLP-2) have provided a basis for targeting these peptides in therapeutic strategies.
AIM: To summarise the preclinical and clinical research supporting the discovery of new therapeutic molecules targeting GLP-1 and GLP-2.
METHODS: This review is based on a comprehensive PubMed search, representing literature published during the past 30 years related to GLP-1 and GLP-2.
RESULTS: Although produced and secreted together primarily from L cells of the intestine in response to ingestion of nutrients, GLP-1 and GLP-2 exhibit distinctive biological functions that are governed by the expression of their respective receptors, GLP-1R and GLP-2R. Through widespread expression in the pancreas, intestine, nervous tissue, et cetera, GLP-1Rs facilitates an incretin effect along with effects on appetite and satiety. GLP-1 analogues resistant to degradation by dipeptidyl peptidase-IV and inhibitors of dipeptidyl peptidase-IV have been developed to aid treatment of diabetes and obesity. The GLP-2R is expressed almost exclusively in the stomach and bowel. The most apparent role for GLP-2 is its promotion of growth and function of intestinal mucosa, which has been targeted for therapies that promote repair and adaptive growth. These are used as treatments for intestinal failure and related conditions.
CONCLUSIONS: Our growing understanding of the biology and function of GLP-1, GLP-2 and corresponding receptors has fostered further discovery of fundamental biological function as well as new categories of potent therapeutic medicines
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