Bibliographies thématiques / 901-1000

Littérature scientifique sur le sujet « 901-1000 »

Auteur : Grafiati
Publié le 26 juillet 2024

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Articles de revues sur le sujet "901-1000"

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Verma, Prince K., Luke Huelsenbeck, Asa W. Nichols, Timur Islamoglu, Helge Heinrich, Charles W. Machan et Gaurav Giri. « Controlling Polymorphism and Orientation of NU-901/NU-1000 Metal–Organic Framework Thin Films ». Chemistry of Materials 32, no 24 (8 décembre 2020) : 10556–65. http://dx.doi.org/10.1021/acs.chemmater.0c03539.

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Liu, Yang, Jinhong Shi, Qingming Yang, Chunmeng Wang, Feifei Liang, Zeguang Wu, Qiezhong Lamao et al. « The interim analysis of a first-in-human phase 1 trial of ET-901, a CRISPR edited allogeneic immune-cloaked anti-CD19 CAR-T cell therapy in patients with r/r B-NHL. » Journal of Clinical Oncology 42, no 16_suppl (1 juin 2024) : e19010-e19010. http://dx.doi.org/10.1200/jco.2024.42.16_suppl.e19010.

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e19010 Background: Allogeneic CAR T-cell therapy faces challenges like limited persistence and host rejection. Current research has improved its viability by modifying genes like B2M, despite new challenges like NK cell targeting have emerged. Through CRISPR screening, we discovered a novel gene, named GeneX, and its role in enhancing T cell persistence against allogeneic attacks and AICD. GeneX influences glycan composition, affecting immune responses and AICD initiation. Engineered GeneXKO/TCRKO/anti-CD19 CAR T cells (ET-901) resisted allogeneic killing and maintained anti-tumor effects without causing GvHD, marking a significant advancement in CAR T-cell therapy. Methods: ET-901 is being tested in a phase 1 trial for r/r B-NHL at a single center, utilizing a 3+3 dose escalation scheme and planning for expansion at the recommended Phase 2 dose. Participants must have an ECOG status of 0–2, without a history of allo-HSCT or CAR-T therapy. The study's main goals are to assess ET-901's safety and establish the optimal Phase 2 dosage. Patients undergo a 3-day lymphodepletion with fludarabine (30-50 mg/m2/d) and cyclophosphamide (500-1000 mg/m2/d), followed by a single-dose infusion of ET-901 at escalating doses (DL1:1*10e6/kg, DL2:3*10e6/kg, and DL3:10*10e6/kg). Pharmacokinetic monitoring occurs during follow-up. Results: From September 2023, a total of six patients were enrolled in the escalation cohort, including 4 patients with LBCL and 2 with FL. In these patients (3 males), the median age was 53 years (range: 46–55 years), and the median number of prior treatment lines was 5. The median SPD was 7,650 mm2 (range: 2,700-43,400 mm2). Notably, two cases in DL2 exhibited unusual lymphoma infiltration sites: patient No.4 in the forearm muscle and patient No.5 in the spleen. Update to February 2024, we have completed the safety evaluation of Dose Level (DL) 1 and DL2. No DLTs were observed. The most common TRAEs of any grade included leukopenia (6/6), granulocytopenia (6/6), anemia (6/6), thrombocytopenia (6/6), CRS (6/6), infection (2/6), ICANS (2/6), and GvH like reaction (1/6). All patients achieved objective responses, with 2 cases of PR and 4 cases of CR (1 in DL1, 3 in DL2). The peak values of CAR+ cells count and VCN in peripheral blood were 36.0/μl (range: 14.0-48.0/μl, median: day 7), and 9.6e4 copies/μg (range: 7.7e4-1.2e5 copies/μg, median: day 7), respectively. In all patients, a second expansion of CAR-T cells was observed alongside B cell recovery. This confirms that GeneX knockout enables allo CAR-T cells to maintain long-term immune privilege while preserving their biological function. Conclusions: The study demonstrated the safety and feasibility of ET-901 in patients with r/r B-NHL. These findings highlight the potential of ET-901 as an effective therapeutic approach for improving outcomes for these patients. Clinical trial information: NCT06014073 .
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Xuyen, Ngo Thi, Raf Verlinden, Ruth Stoffelen, Dirk De Waele et Rony Swennen. « Host plant response of Eumusa and Australimusa bananas (Musa spp.) to migratory endoparasitic and root-knot nematodes ». Nematology 2, no 8 (2000) : 907–16. http://dx.doi.org/10.1163/156854100750112851.

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AbstractTwenty-five banana varieties of section Eumusa (AA-group) and seven of the section Australimusa (Fe'i-group) from Papua New Guinea were evaluated for resistance to Radopholus similis, Pratylenchus coffeae and Meloidogyne spp. The host plant responses were compared with the susceptible reference cvs Grande Naine and Cavendish 901. In vitro propagated plants were transferred to the glasshouse in loamy sand and inoculated with approximately 1000 migratory endoparasitic nematodes at 4 weeks after planting. Reproduction of R. similis and P.coffeae in the roots was determined at 8 or 10 weeks, respectively, after inoculation. Reproduction of Meloidogyne spp. was determined 8 weeks after inoculation with 3300 to 5000 eggs. No resistance to R. similis was found in the diploid varieties. The Fe'i variety Rimina and possibly Menei were resistant to R. similis. All varieties tested were susceptible to P.coffeae and Meloidogyne spp. Tests de résistance de bananiers Eumusa et Australimusa (Musa spp.) envers les nématodes endoparasites migrateurs et galligènes - Vingt-cinq variétés de bananier de la section Eumusa (groupe AA) et sept de la section Australimusa (group Fe'i) provenant de Papouasie-Nouvelle Guinée ont été testées pour leur résistance envers Radopholus similis, Pratylenchus coffeae et Meloidogyne spp. Les résponses de ces variétés ont été comparées à celles des cultivars sensibles de référence Grande Naine et Cavendish 901. Des vitroplants ont été mis en place en serre sur un sol argilo-sableux et inoculés 4 semaines après plantation avec environ 1000 R. similis ou P.coffeae dont la reproduction a été déterminée 8 et 10 semaines, respectivement, après inoculation. La reproduction de Meloidogyne spp. l'a été 8 semaines après inoculation avec 3300 à 5000 oeufs. Aucune résistance à R. similis n'a été observée chez les variétés diploïdes. Les variétés du groupe Fe'i Rimina et Menei se sont montrées résistantes à R. similis, avec un certain doute dans le cas de la dernière. Toutes les variétés testées sont sensibles à P.coffeae et Meloidogyne spp.
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Kuitunen, Ilari, Mikko M. Uimonen, Marjut Haapanen, Reijo Sund, Ilkka Helenius et Ville T. Ponkilainen. « Incidence of Neonatal Developmental Dysplasia of the Hip and Late Detection Rates Based on Screening Strategy ». JAMA Network Open 5, no 8 (18 août 2022) : e2227638. http://dx.doi.org/10.1001/jamanetworkopen.2022.27638.

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ImportanceUniversal ultrasonographic screening for developmental dysplasia of the hip (DDH) has gained increasing popularity despite the lack of benefit in terms of reducing the rates of late-detected cases (age ≥12 weeks) in randomized clinical trials.ObjectiveTo report the reported incidence of DDH in the English scientific literature and compare rates of late-detected cases in settings with different DDH screening strategies.Data SourcesPubMed, Scopus, and Web of Science databases were searched on November 25 and 27, 2021. No time filters were used in the search.Study SelectionAll observational studies reporting the incidence of early-detected or late-detected (age ≥12 weeks) DDH were included. Non-English reports were excluded if the abstract did not include enough information to be included for analysis.Data Extraction and SynthesisThe number of newborns screened and the detection rates were extracted. Meta-analysis calculated the pooled incidence of DDH per 1000 newborns with 95% CIs using a random- or fixed-effects model. This study is reported according to the PRISMA and MOOSE guidelines.Main Outcomes and MeasuresThe main outcome measures were early detection, early treatment, late detection, and operative treatment incidences.ResultsA total of 1899 studies were identified, 203 full texts were assessed, and 76 studies with 16 901 079 infants were included in final analyses. The early detection rate was 8.4 (95% CI, 4.8-14.8) infants with DDH per 1000 newborns with clinical screening, 4.4 (95% CI, 2.4-8.0) infants with DDH per 1000 newborns with selective ultrasonographic screening, and 23.0 (95% CI, 15.7-33.4) infants with DDH per 1000 newborns with universal ultrasonographic screening. Rates for nonoperative treatment were 5.5 (95% CI, 2.1-14) treatments per 1000 newborns with clinical screening, 3.1 (95% CI, 2.0-4.8) treatments per 1000 newborns with selective ultrasonographic screening, and 9.8 (95% CI, 6.7-14.4) treatments per 1000 newborns with universal ultrasonographic screening. The incidence of late-detected DDH was 0.5 (95% CI, 0.2-1.5) infants with DDH per 1000 newborns with clinical screening, 0.6 (95% CI, 0.3-1.3) infants with DDH per 1000 newborns with selective ultrasonographic screening, and 0.2 (95% CI, 0.0-0.8) infants with DDH per 1000 newborns with universal ultrasonographic screening. The corresponding incidences of operative treatment were 0.2 (95% CI, 0.0-0.9) operations per 1000 newborns with clinical screening, 0.5 (95% CI, 0.4-0.7) operations per 1000 newborns with selective ultrasonographic screening, and 0.4 (95% CI, 0.2-0.7) operations per 1000 newborns with universal ultrasonographic screening.Conclusions and RelevanceThis meta-analysis found that early detection rates and nonoperative treatments were higher with universal screening. The late detection and operative treatment rates with universal screening were similar to those among selectively and clinically screened newborns. Based on these results, universal screening may cause initial overtreatment without reducing the rates of late detection and operative treatment.
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Lugovyi, Volodymyr, Olena Slyusarenko et Zhanneta Talanova. « The Law of Increasing the Steepness of the University’s Ascent to the Top of Excellence ». International Scientific Journal of Universities and Leadership, no 15 (7 juillet 2023) : 30–53. http://dx.doi.org/10.31874/2520-6702-2023-15-30-53.

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In the article, based on summarising the data of the Shanghai rating for 2004-2022, other ratings, the law of increasing steepness of the university's ascent to the top of excellence is formulated. The law determines that the university's approach to the state of highest perfection is accompanied by an increase in the rating steepness (as the difference in scores of neighbouring places) of the upward trajectory. In particular, the average rating steepness for the first ten places of the institutional version of the 2022 Shanghai rating is almost 1000 times higher than this characteristic for the last 100 positions (901-1000) of the rating distribution. The law applies both to institutions as a whole and to individual academic subjects. Empirical and theoretical justifications of the law are provided. The law has a statistical and probabilistic nature, it makes it possible to theoretically predict and practically design the behaviour of both the population and individual universities in their advancement to leadership. Among the consequences of the law is the need for a progressive, exponentially growing concentration of resources (human, organisational, informational, infrastructural, and financial) to generate the university's capacity to achieve the highest mission-appropriate levels of complexity of educational, research, and innovative activities. The law expands the framework of the university science (university studies), is important for the development of a strategy for the development of leading universities of the highest excellence (strategy-2), the implementation of the second dimension of the Bologna process and the European Higher Education Area (competitiveness and attractiveness), is relevant for the post-war recovery of Ukraine from the consequences of the war on an innovative, highly intelligent and high-tech basis.
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Valarezo, Eduardo, Génesis Gaona-Granda, Vladimir Morocho, Luis Cartuche, James Calva et Miguel Angel Meneses. « Chemical Constituents of the Essential Oil from Ecuadorian Endemic Species Croton ferrugineus and Its Antimicrobial, Antioxidant and α-Glucosidase Inhibitory Activity ». Molecules 26, no 15 (29 juillet 2021) : 4608. http://dx.doi.org/10.3390/molecules26154608.

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Croton ferrugineus Kunth is an endemic species of Ecuador used in traditional medicine both for wound healing and as an antiseptic. In this study, fresh Croton ferrugineus leaves were collected and subjected to hydrodistillation for extraction of the essential oil. The chemical composition of the essential oil was determined by gas chromatography equipped with a flame ionization detector and gas chromatography coupled to a mass spectrometer using a non-polar and a polar chromatographic column. The antibacterial activity was assayed against three Gram-positive bacteria, one Gram-negative bacterium and one dermatophyte fungus. The radical scavenging properties of the essential oil was evaluated by means of DPPH and ABTS assays. The chemical analysis allowed us to identify thirty-five compounds representing more than 99.95% of the total composition. Aliphatic sesquiterpene hydrocarbon trans-caryophyllene was the main constituent with 20.47 ± 1.25%. Other main compounds were myrcene (11.47 ± 1.56%), β-phellandrene (10.55 ± 0.02%), germacrene D (7.60 ± 0.60%), and α-humulene (5.49 ± 0.38%). The essential oil from Croton ferrugineus presented moderate activity against Candida albicans (ATCC 10231) with an MIC of 1000 μg/mL, a scavenging capacity SC50 of 901 ± 20 µg/mL with the ABTS method, and very strong antiglucosidase activity with an IC50 of 146 ± 20 µg/mL.
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Sajid, Muhammad, Abdul Rashid, Muhammad Abid, Humaira Jamil, Muhammad R. Bashir, Zahid M. Sarwar, Rashida Perveen et Sobia Chohan. « INFLUENCE OF BT COTTON GERMPLASM ON BACTERIAL BLIGHT DISEASE IN PAKISTAN ». Pakistan Journal of Phytopathology 30, no 2 (27 décembre 2018) : 145. http://dx.doi.org/10.33866/phytopathol.030.02.0430.

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In present research assessment of disease incidence was made between Bt and Non-Bt cotton against bacterial blight disease. Experiment was carried out in natural environmental conditions on twenty eight varieties/advance lines. Findings of the experiments depicted more disease incidence on Non-Bt varieties viz., Non Bt-FH 901 (41.7-43.4%), Non Bt-MNH 496 (47.6-49.5%), Non Bt-FH 1000 (48.6-51.2%), Non Bt-FH 207 (54.5-57.5%), Non BT-N 112 (54.7-56.3%), Non BT-FH 942 (55.7-59.5%), Non BT-MNH 6070 (61.5-64.7%), Non Bt-FH 941 (63.4-61.6%), Non BT-N 814 (70.4-71.3%), Non Bt-FH 900 (74.7-77.4%), Non Bt-ANMOL (74.8-76.8%), Non Bt-FH 2015 (78.5-80.6%), Non BT REDACOLA (81.5-79.6%) and Non BT-C 26 (83.3-85.6%) while BT varieties BT-S-78 (25.8-26.7%), BT-Z-33 (26.7-22.2%), BT-786 (28.6-31.5%), BT-A-ONE (28.8-26.5%), BT-282 (30.5-27.6%), BT-886 (33.5-35.3%), BT-3701 (38.3-36. %), BT-SPECIAL (38.4-34.6%), BT-802 (41.3-43.4%), BT-92 (41.4-44.4%), BT-131 (43.8-41.7%), BT-905 (44.6-42.3%), BT-SUPPER (45.6-46.8%) and BT-121 (48.6-52.4%) showed decreased response respectively. Hence, concluded that difference/variability in the resistant sources is present in Pakistan against the disease among BT varieties as compared to Non-Bt.
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حسين, طيب فرج, et محى الدين محمود رطيبة. « تقدير بعض الخصائص الوراثية في عدة أصناف من القمح باختلاف ظروف الري والتسميد النيتروجيني ». Al-Mukhtar Journal of Sciences 33, no 1 (31 mars 2018) : 46–57. http://dx.doi.org/10.54172/mjsc.v33i1.50.

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نفذت تجربتان حقليتان لموسمين لكل منهما الأولى في مسة لتقدير السلوك الوراثي لبعض أصناف القمح الصلب والخبز (BJy، كاسي، كفرة1، كفرة 2، Vee، كريم، صلامبو80، كساد 901، جيزة 168، بني سويف1، مرجاوي وسخا 69) تحت نظامي الزراعة البعلية والري التكميلي، والثانية في قندولة جنوب الجبل الأخضر لدراسة السلوك الوراثي لقمح الخبز (صلامبو 80، شام 10 وأبوالخير) لاختلاف المستويات المضافة ثنائي أمونيوم الفوسفات 18 DAP : 46 (0، 70، 140 و210 كجم / هـ) تمثلت دراسة السلوك الوراثي في تقدير معامل الاختلاف الوراثي (GCV)، معامل الاختلاف المظهري (PCV)، معامل التحسين الوراثي المتوقع (GA) ومعامل التوريث بالمعنى الواسع (H2) خلال موسمي الدراسة 2013 – 2014لا والثاني 2014 – 2015. صممت التجربة الأولى بالشرائح المنشقة ووزعت نظم الزراعة على الشرائح والأصناف في القطع الثانوية مساحتها 3x 3 (9 م2) بينما الثانية بالقطع المنشقة لمرة واحدة وفي 4 مكررات لكلتا التجربتين. سجلت النتائج تقارب الأصناف في الخصائص : ارتفاع النبات، عدد الأشطاء الفاعلة، طول السنبلة، وزن حبوب السنبلة، المحصول البيولوجي، محصول الحبوب، محصول القش، دليل الحصاد، وزن 1000 حبة ومحتوى الحبوب من البروتين نتيجة انخفاض قيم GCVوPCV مع وجود ميل للتحسين الوراثي لتلك الخصائص في بعض الأصناف باختلاف نظم الزراعة او مستويات التسميد دلت هذه الاستجابات لثبوت الخصائص الوراثية عند إدخالها لبرامج التربية وأشارت تلك المؤشرات لتضاعف استجابتها تحت الري التكميلي مقارنة بالزراعة البعلية أو نتيجة التسميد مقارنة بعدمه وبتأكد ذلك لارتفاع قيم H2 لمعظم الخصائص المشار إليها لكلتا التجربتين في كلا الموسمين
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Beynnon, Bruce D., Pamela M. Vacek, Darlene Murphy, Denise Alosa et David Paller. « First-Time Inversion Ankle Ligament Trauma ». American Journal of Sports Medicine 33, no 10 (octobre 2005) : 1485–91. http://dx.doi.org/10.1177/0363546505275490.

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Background Inversion ankle trauma is disabling, yet little is known regarding the incidence rate of first-time ankle sprains and how it is influenced by factors including sex, level of competition, and sport. Hypothesis The incidence rates of first-time ankle ligament sprains are influenced by sex, level of competition (high school vs college), and type of sports participation (basketball, soccer, lacrosse, and field hockey). Study Design Cohort study; Level of evidence, 2. Methods Between 1999 and 2003, high school and college athletes were evaluated before participation in their sports. Subjects were included in the study if they had not experienced a prior ankle or lower extremity injury and were then followed during participation in soccer, basketball, lacrosse, or field hockey to document their days of exposure to sport and injuries sustained. The relative risk associated with sex, level of competition, and sport was estimated by Cox regression. Results A total of 901 athletes had 50 680 person-days of exposure to sports, and 43 (4.8%) had an inversion injury that produced an ankle ligament sprain. Overall, the injury incidence rate was 0.85 sprains per 1000 person-days of exposure to sport. There were 0.68 and 0.97 ankle sprains per 1000 person-days of exposure to sport for the men and women, respectively. Although the risk of suffering an ankle sprain was higher for women than for men (relative risk, 1.51), the difference was not statistically significant (P=. 21) and was owing to the increased risk in female basketball athletes compared to male basketball athletes (relative risk, 4.11; P=. 045). Risk of injury was similar for the high school athletes in comparison to the college athletes (relative risk, 1.16). For the men, there was no difference in the risk of suffering an ankle sprain between the sports of basketball, soccer, and lacrosse, whereas for the women, the risk of suffering an ankle sprain was significantly greater during participation in basketball compared to lacrosse. Conclusion In this study of first-time ankle sprains, for most sports, the incidence rate of inversion injury is less than 1 per 1000 days of exposure to sport, a value lower than previously reported. Among female athletes, ankle injury is associated with type of sport. Risk is highest for female basketball athletes, who are at significantly greater risk than male basketball athletes and female lacrosse athletes. The risk of first-time ankle injury is similar for high school and college-level athletes.
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Sajid, Muhammad, Abdul Rashid, Muhammad R. Bashir, Muhammad A. Zeeshan, Muhammad Abid, Rashida Parveen, Sobia Chohan et Humaira Jamil. « EVALUATION OF AVAILABLE GENETIC RESOURCE AGAINST BACTERIAL BLIGHT OF COTTON IN PAKISTAN ». Pakistan Journal of Phytopathology 29, no 1 (12 juillet 2017) : 63. http://dx.doi.org/10.33866/phytopathol.029.01.0331.

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Bacterial leaf Blight of cotton a major seed borne foliar disease that attacks the crop at all growth stages leading to cause severe losses in conducive environment. To find out best source of resistance against pathogen this research was conducted in the field area Department of Plant Pathology, University of Agriculture Faisalabad. Incidence of bacterial blight of cotton was determined on twenty eight varieties/advanced lines sown in field to determine the resistance resource against the disease. Two years data showed that seventeen varieties (BT-Z-33, BT-S-78, BT-786, BT-A-ONE, BT -282, BT-886, BT-3701, BT-SPECIAL, BT-802, Non Bt-FH 901, BT-92, BT-131, BT-905, BT-SUPPER, Non Bt-MNH 496, Non Bt-FH 1000, and BT-121) expressed moderately resistant response with 21-50 % disease incidence (rating 4). Five varieties viz. Non Bt-FH 207, Non BT-N 112, Non BT-FH 942, Non BT-MNH 6070 and Non Bt-FH 941exhibited moderately susceptible response with 51-70% disease incidence under rating 5. Four varieties namely Non BT-N 814, Non Bt-FH 900, Non BT-ANMOL and Non Bt-FH 2015 showed susceptible response with 71-80% disease incidence (rating 6) while Non BT-REDACOLA and Non BT-C 26 expressed highly susceptible response with disease incidence 81-100% rating 7 against bacterial blight disease of cotton. Results indicate that a wide range of resistant resource is present in Pakistan against the disease. The selection of diverse germplasm/resistant varieties through screening is the most efficient, environment friendly and economical management strategy for farmers against this disease.
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Livres sur le sujet "901-1000"

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ill, Leng Qin, dir. Hana Hashimoto, sixth violin. Toronto, ON : Kids Can Press, 2014.

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Curtis, Christopher Paul. The Watsons go to Birmingham--1963 : A novel. New York : Dell Laurel Leaf, 2000.

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Curtis, Christopher Paul. Bud, not buddy. New York : Dell Yearling, 1999.

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Beverly, Cleary. Dear Mr. Henshaw. New York, USA : Scholastic Inc., 1998.

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Beverly, Cleary. Qin ai de Hanxiu xian sheng. Taibei Shi : Zhi mao wen hua shi ye you xian gong si, 1992.

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Ingersoll, Glenn. Thousand 901-1000. Independently Published, 2018.

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Ygua, Ruben. EL FEUDALISMO : 901- 1000. Independently Published, 2019.

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Beginners Sudoku : 100 Pages - 6X9in, Easy to Solve Puzzles : Volume 10 - Puzzles 901-1000. Independently Published, 2021.

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Butler, Jane. Advanced Sudoku : 100 Large Print Puzzle Book for All Ages : Puzzles 901-1000 / Volume 10. Independently Published, 2021.

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Intermediate Sudoku : 100 Pages - 6X9in, Medium Difficulty Puzzles to Solve : Volume 10 - Puzzles 901-1000. Independently Published, 2021.

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Chapitres de livres sur le sujet "901-1000"

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Rainsberger, Livia. « Fragen 901 bis 1000 VERTRIEBSMANAGEMENT – 100 Fragen für Vertriebsmanager ». Dans Edition Sales Excellence, 365–416. Wiesbaden : Springer Fachmedien Wiesbaden, 2024. http://dx.doi.org/10.1007/978-3-658-43783-1_12.

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« Charters 901–1000 ». Dans Diplomatarium of the Crusader Kingdom of Valencia, 471–579. Princeton University Press, 2021. http://dx.doi.org/10.2307/j.ctv20hcs05.12.

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« Charters 901–1000 ». Dans Diplomatarium of the Crusader Kingdom of Valencia, 471–582. Princeton University Press, 2002. http://dx.doi.org/10.1515/9780691239835-009.

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--. « 5. Rezensionen und Kommentare zu Filmen und Verfilmungen Nr. 806-893 6. Kommentare zu Peisverleihungen Der Literaturpreis des Landes Steiermark Nr. 894-900 Der Preis des Literaturmagazins des Südwestfunks N. 901 Das Stipendium des Förderungsprogramms 'Auswärtige Künstler zu Gast in Hamburg' Nr. 902-903 Der Würdigungspeis für Literatur des Bundesministeriums für Unterricht und Kunst Nr. 904-912 Der manuskripte-Preis Nr. 913-914 Großer Preis des Stadt Wien u. der Marie-Luise-Kaschnitz-Preis Nr. 915-919 7. Vermischte Kommentare und Beiträge zu Werk und Biographie in Zeitungen und Zeitschriften Nr. 920-1000 8. Rezensionen zu Fotoausstellungen Nr. 1001-1004 ». Dans Gerhard Roth : Eine Bibliographie. Werke und Rezeption 1966-1994. Dept. of German, University of Otago, 1995. http://dx.doi.org/10.11157/ogs-vol8id261.

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Actes de conférences sur le sujet "901-1000"

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Mutama, Kuda R. « Some Aspects of Steam Turbine Valves : Materials, Operations and Maintenance ». Dans ASME 2013 Power Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/power2013-98289.

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Steam turbine valves are the most essential components of modern steam turbines from an operation, performance, reliability and safety aspects of a modern power plant. Current designs are pushing the operational envelope and it is not uncommon for large ultracritical plants to run on pressures exceeding 4500 psi and 1200 °F. These conditions are not only challenging for materials of construction for turbines and boilers but also for main steam turbine valves. The tendency of materials to oxidize at these temperatures is all too common causing problems for valve heads, stems, discs, bushings and seats. OEMs around the world are pushing to develop valve components with 9–12% Cr martensitic steels and nickel based alloys which offer better creep strength at elevated temperatures. For existing power plants at temperatures of a 1000 to 1050 °F range there is a push to retrofit valve components with Incolloy 901 type, Inconel 718 and Stellite alloys. Scale build up in traditional alloys happens too quickly for the usual two year maintenance cycle. The application of better alloys for steam turbine valves makes it possible to increase the maintenance cycle from two to four or even six years, while increasing the operational reliability of the valve. Elimination of main steam valve failures removes risks of turbine overspeed events and increases plant availability. Solid particle erosion is not forgiving on valve parts such as stems, discs and valve seats and over a period of time, excessive wear causes the valve to be rendered unsafe to continued service. Nitrided materials and chrome-carbide-coated materials are much harder than the stem base material; and to slow down wear, a nitriding process is used to develop a thin, hard, wear-resistant surface. Some of the material often used for Stellite liners are Nitralloy 135M, 410 SS, 422 SS Nitrided, Incolloy 901 Nitrided, 347 SS, 13Cr-13Ni-10Co-3Nb-2.5W-2Mo. Different OEMs use a variety of alloys for valve seats, discs and stems. Antigalling characteristics are particularly favorable. Valve casings are cast materials and usually specifications include the ASTM A217 and ASTM A356. The ASTM A217 cast steels are typically, 1.25Cr-0.5Mo Grade WC6 and the 2.25Cr-1Mo Grade WC9 materials. Some of the problems experienced with steam turbine valves, are sticking to the valve seat requiring excessive pull-out force, wear of the seat surface, valves not closing properly due to oxidation build up, Stellite weld cracking, cutting or gouging due to solid particle erosion. The material presented in this paper is of interest to fossil power plant personnel experiencing challenges on valve performance and maintenance. The paper looks at all aspects of steam turbine valves as far as current trends in valve material, operation and maintenance and lastly, looks at recent occurrences of valve failures leading to steam turbine overspeed catastrophic failures around the world.
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