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Naval Engineers Journal 1963年第N 3期v 75卷 p609-622页

作者： Fioriti, I. Vasta, J. Starr, A. Mr. Fioriti is the Materials Engineer in the Hull Scientific and Research Section Bureau of Ships with responsibility for materials and fabrication processes that are used in the construction of ship hulls. Mr. Fioriti attended the University of Pittsburgh receiving the Bachelor of Science degree in Metallurgical Engineering in 1951. He took postgraduate work at the University of Maryland receiving the Master of Science degree in 1960. From 1951 to 1956 he worked in the Metals and Metallurgy Section of the Bureau of Ships where he planned and administered research programs on metals for ships. He was associated intimately with the development of HY-80 steel and prepared the first specification used for its procurement by the Navy. In addition he was responsible for the development of dimpled armor plate for aircraft carrier flight decks. In 1956 he assumed his present position where he has been active in the Ship Structure Committee research program the low cycle fatigue structural program and the hydrofoil materials research program. Mr. Vasta is the Head of Hull Scientific and Research Section Bureau of Ships with responsibility for planning initiating and technically monitoring research in the fields of structural mechanics and hydromechanics. Mr. Vasta attended New York University receiving the Bachelor of Science degree in Mechanical Engineering in 1930. He took postgraduate work at the Massachusetts Institute of Technology receiving the Master of Science degree in 1931. From 1931 to 1938 he worked at the United States Experimental Model Basin in the structural mechanics group. After a short duty at the Headquarters of the United States Coast Guard he joined in 1939 the staff of the United States Maritime Commission where he held various positions of responsibility in the Technical Division. He was associated intimately with the design development of the reinforced concrete ship program first as Assistant Chief and then as the Chief of the Section. Thereafter he was appointed Assistant Chief of

Research program of U S bureau of Ships is in final phase;literature survey and screening phases are completed;on basis of tests, fabrication studies and cost analyses most promising materials are steels 4330M and 17-4PH (H1025) with protective coatings, and 2 titanium alloys (8AL-2Cb-1TA) and (6AL-4V);most promising coatings are polyurethane rubber and neoprene rubber base coatings;coated HY-100 steel is satisfactory for low performance foils;glass laminates are of particular interest as foil materials and are under study;no "off shelf" material is ideal for high speed foils.

关键词： Hydrofoils

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Electrochemical and quantum chemical investigation on the adsorption behavior of a schiff base and its metal complex for corrosion protection of mild steel in 15 wt% HCl solution

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Heliyon 2024年第23期10卷 e40662页

作者： El-Haitout, badr Sardjono, Ratnaningsih Eko Es-Sounni, bouchra Chafiq, Maryam Salghi, Rachid bakhouch, Mohamed Al-Moubaraki, Aisha H. Al-Ahmari, Jamilah M. Al-Ghamdi, Azza A. Fahim, Mohammed Hammouti, belkheir Chaouiki, Abdelkarim Ko, Young Gun Laboratory of Applied Chemistry and Environment ENSA University Ibn Zohr PO Box 1136 Agadir 80000 Morocco Chemistry Program Universitas Pendidikan Indonesia Setiabudi 229 Bandung 40154 Indonesia Laboratory of Innovative Material and Biotechnology of Naturel Resources Faculty of Sciences of Meknes Moulay Ismail University Morocco Integrated Materials Chemistry Laboratory School of Materials Science and Engineering Yeungnam University Gyeongsan 38541 South Korea Euromed University of Fes UEMF Morocco Laboratory of Bioorganic Chemistry Department of Chemistry Faculty of Sciences Chouaïb Doukkali University P.O. Box 24 El Jadida M-24000 Morocco Department of Chemistry Faculty of Sciences–Alfaisaliah Campus University of Jeddah Jeddah 21589 Saudi Arabia

This work evaluates the effectiveness of Schiff base derivatives, namely, 2,2'-((1E,1′E)-((2,2-dimethylpropane-1,3-diyl)bis(azaneylylidene))bis(methaneylylidene))diphenol (DAMD) and (2-((E)-((3-(((E)-2-hydroxybenzylidene)amino)-2,2dimethylpropyl)imino)methyl)phenoxy) zinc (HDMZ), as corrosion inhibitors for mild steel in a 15 % HCl solution. by employing a blend of experimental assessments and theoretical computations, such as electrochemical tests, morphological observations, and theoretical simulations, the study achieved an impressive up to 94.6 % inhibition efficiency. Notably, HDMZ exhibited significant protective properties. The results of PDP showed that both inhibitors act as mixed-type corrosion inhibitors. SEM surface analysis of the uninhibited and inhibited samples revealed the formation of a protective layer of inhibitor molecules on the mild steel surface to mitigate its corrosion. The Langmuir adsorption model verified the occurrence of dual adsorption, while theoretical simulations offered insights into the underlying interaction mechanisms. The identification of Schiff-based inhibitors reveals a pronounced synergistic effect in corrosion inhibition, marking a significant advancement in understanding corrosion control mechanisms. This study illuminates the process of forming covalent bonds between inhibitor molecules and iron atoms, presenting a hopeful path towards the advancement of corrosion inhibitors tailored for industrial use. The parallel adsorption configuration and mutual interactions form a stable structure, reinforcing the organic-metal bonds and enhancing both chemical and physical adhesion to the steel surface. These findings indicate that the synergistic effect of molecular interactions and polar-rich regions offers a promising strategy for designing functional hybrid materials. © 2024 The Authors

关键词： Adsorption behavior Corrosion inhibitor Electrochemistry Molecular modelling Schiff base metal complex

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SYNTACTIC FOAMS FOR DEEP SEA engineering APPLICATIONS

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NAVAL ENGINEERS JOURNAL 1968年第2期80卷 235-&页

作者： RESNICK, I MACANDER, A Israel Resnick attended George Washington University and the City College of New York and received a B.S. degree in Chemistry from latter in 1942. He has done graduate work at Brooklyn Polytechnic Institute. From 1942 to 1948 he was with the U. S. Army Quartermaster Corps as a Supervisor of Inspectors of Chemicals and Plastics. Since 1948 he has been a member of the technical staff as a Materials Engineer at the U. S. Naval Applied Science Laboratory where he has been active in reinforced plastics and cellular plastics for more than 15 years. Since 1963 he has been Senior Task Leader on Syntactic Foam in the Plastics and Elastomers Branch of the U. S. Naval Applied Science Laboratory. He is a member of RESA (Scientific Research Society of America) and he is Chairman of Subcommittee VI on Syntactic Foam of ASTM Committee D20. Aleksander Macander attended Fairleigh Dickinson University and received a B.S. degree in Mechanical Engineering in 1962. He is presently attending Stevens Institute of Technology where he is pursuing a graduate degree in Plastics Engineering. Since 1962 Mr. Macander has been a member of the U. S. Naval Applied Science Laboratory technical staff as a Mechanical Engineer. For the last five years he has been engaged in the development of syntactic foam systems for buoyancy and structural applications in the deep ocean as well as the development of ultrasonic nondestructive test methods for quality assurance of these foam materials. In addition Mr. Macander is responsible for the deep submergence materials exposure program in the ocean being conducted by the U. S. Naval Applied Science Laboratory. He is also a member of the Marine Technology Society.

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Fabrication of silica-nypa membrane applied for water desalination

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AIP Conference Proceedings 2024年第1期2710卷

作者： Muthia Elma Isna Syauqiah Era N. R. Oktaviana Siti Fatimah Aulia Rahma Awali Sir Kautsar Harivram Erdina L. A Rampun Chemical Engineering Department Engineering Faculty Lambung Mangkurat University JL. A. Yani KM 36 Banjarbaru South Kalimantan 70714 Indonesia Materials and Membranes Research Group (M2ReG) Lambung Mangkurat University JL. A.Yani KM 36 Banjarbaru South Kalimantan 70714 Indonesia Doctoral Program of Environmental Science postgraduate Program Lambung Mangkurat University Jl. Brigjen H Hasan Basri Kayutangi Banjarmasin South Kalimantan 70123 Indonesia

Carbon source as a template derived from nypa leaf powder enable to strengthen the silica matrix applied for water desalination. This research aims to synthesize silica-nypa membrane, characterize xerogel silica-nypa leaf and investigate the performance of silica-nypa membrane with various concentration of nypa as a carbon template to treat artificial sea water. The concentrations of nypa leaf as a carbon template are 0.1; 0.5 and 2.5 %wt with a calcination temperature of 350 °C through a rapid thermal processing (RTP) technique. Xerogel characterization using FTIR was employed to analyze a spectrum and Scanning Electron Microscopy (SEM) to investigate the membrane morphology. The result shows that the performance of silica-nypa membrane with water fluxes of 2.1915; 2.0163 and 1.1067 kg.m−2. h−1 (for 0.1; 0.5 and 2.5 %wt. carbon template derived from nypa leaf), and the salt rejection value for all concentrations.

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Morfology, Microstrucuture and Electrocatalytical Properties of Sol-Gel Spin Coated bi05na05ba(Tio3)2 Thin Films

SSRN

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SSRN 2022年

作者： batista, Carlos Yago Pereira Romaguera–barcelay, Yonny Matos, Robert Saraiva Pedraça, Aline dos Santos Amâncio, Moisés do Amaral Kourouma, Ansoumane Ruiz, Yurimiler Leyet Cotta, Eduardo Adriano brito, Walter Ricardo Gandarilla, Ariamna María Dip do Nascimento, Marcus Valério botelho Nobre, Francisco Xavier Ferreira, Nilson S. Salerno, Marco da Fonseca Filho, Henrique Duarte Technological Materials Processing Laboratory Federal University of Amazonas Amazonas Manaus69067-005 Brazil BioMark UC Department of Chemical Engineering Faculty of Sciences and Technology University of Coimbra Coimbra3030-790 Portugal Department of Physics Federal University of Amazonas Amazonas Manaus69067-005 Brazil Department of Physics Federal University of Amapá Amapá Macapá68902-280 Brazil Electrical Engineering postgraduate program Federal University of Amazonas Amazonas Manaus69067-005 Brazil Department of Chemistry Federal University of Amazonas Amazonas Manaus69067-005 Brazil Department of Pharmaceutical Sciences Gamal Abdel Nasser University of Conakry Guinea-bissau Federal Institute of Amazonas—Campus Coari Coari69460-000 Brazil Department of Physics Federal University of Sergipe São Cristovão Sergipe49100-000 Brazil Institute for Materials Science Max Bergmann Center of Biomaterials Technische Universität Dresden Dresden01069 Germany Laboratory of Nanomaterials Synthesis and Nanoscopy Department of Physics Federal University of Amazonas Amazonas Manaus69067-005 Brazil

Herein, we report, for the first time, the reduction reaction kinetics of ciprofloxacin organic molecules based on structural and micromorphological conditions of an electrocatalytic system of bi05Na05ba(TiO3)2 (bNT-bT) thin films. XRD analysis showed the coexistence of rhombohedral and tetragonal structures for the bNT-bT thin films annealed at 600, 650, and 700°C, showing that the first one had a greater number of surface defects, which was confirmed by Raman Spectroscopy. Analysis of the 3D micromorphological evaluation showed that an annealing temperature increase from 600 to 700 °C does not induce significant changes in the topographical profile. However, bNT-bT thin films annealed at 600 °C displayed more anisotropic surface microtexture, high spatial complexity, and low spatial frequencies. For the reactive surface of bNT-bT films, the electroanalytical assays showed that electrons from the conduction band are captured by oxygen adsorbed on the film surface, forming superoxide radicals that attack ciprofloxacin molecules, promoting their degradation. The best performance observed for the bNT-bT thin films annealed at 600 ºC is attributed to their unique structural and micromorphological properties compared to the films annealed with higher temperatures. Our results prove that the proposed thin film deposition process is a promising approach for developing new electrocatalytic devices. © 2022, The Authors. All rights reserved.

关键词： Sol-gels

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Date fruit melanin is primarily based on (-)-epicatechin proanthocyanidin oligomers( vol 14 , 4863 , 2024)

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SCIENTIFIC REPORTS 2024年第1期14卷 1-12页

作者： Alam, Muneeba Zubair Okonkwo, Clinton Emeka Cachaneski-Lopes, Joao P. Graeff, Carlos F. O. batagin-Neto, Augusto Tariq, Saeed Varghese, Sabu O'Connor, Matthew J. Albadri, Abuzar E. Webber, J. beau W. Tarique, Mohammed Ayyash, Mutamed Kamal-Eldin, Afaf Department of Food Science College of Agriculture and Veterinary Medicine United Arab Emirates University P.O. Box: 15551 Al-Ain United Arab Emirates National Water and Energy Center (NWEC) United Arab Emirates University P.O. Box: 15551 Al-Ain United Arab Emirates Postgraduate Program in Materials Science and Technology (POSMAT) São Paulo State University (UNESP) Bauru SP Brazil Department of Physics School of Sciences São Paulo State University (UNESP) Bauru SP Brazil Institute of Sciences and Engineering São Paulo State University (UNESP) Itapeva SP Brazil Department of Anatomy College of Medicine and Health Sciences United Arab Emirates University Al Ain United Arab Emirates Core Technology Platforms New York University Abu Dhabi 129188 Abu Dhabi United Arab Emirates Department of Chemistry College of Science Qassim University 51452 Buraidah Saudi Arabia Lab-Tools Ltd. Marlowe Innovation Centre Marlowe Way Ramsgate CT12 6FA UK

Plant-based melanin seems to be abundant, but it did not receive scientific attention despite its importance in plant biology and medicinal applications, e.g. photoprotection, radical scavenging, antimicrobial properties, etc. Date fruit melanin (DM) has complex, graphene-like, polymeric structure that needs characterization to understand its molecular properties and potential applications. This study provides the first investigation of the possible molecular composition of DM. High performance size-exclusion chromatography (HPSEC) suggested that DM contains oligomeric structures (569–3236 Da) and transmission electron microscopy (TEM) showed agglomeration of these structures in granules of low total porosity (10–1000 Å). Nuclear magnetic resonance (NMR) spectroscopy provided evidence for the presence of oligomeric proanthocyanidins and electron paramagnetic resonance (EPR) spectroscopy revealed a g-factor in the range 2.0034–2.005. Density functional theory (DFT) calculations suggested that the EPR signals can be associated with oligomeric proanthocyanidin structures having 4 and above molecular units of (−)-epicatechin. The discovery of edible melanin in date fruits and its characterization are expected to open a new area of research on its significance to nutritional and sensory characteristics of plant-based foods.

关键词： Phoenix dactylifera L. (−)-Epicatechin Date fruit Melanin Proanthocyanidins

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Experimental investigation of productivity of machining process using double tool turning

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AIP Conference Proceedings 2022年第1期2648卷

作者： Kuba Defaru Nedi Moera Gutu Jiru G. M. Sayeed Ahmed Dasari Govardhan 1Department of Mechanical Design and Manufacturing Engineering Adama Science and Technology University ADAMA Ethiopia. P.O.Box:1888 2Program of Mechanical Design and Manufacturing Engineering School of Mechanical Chemical and Materials Engineering (SoMCME) ASTU ADAMA Ethiopia. P.O.Box:1888 3Department of Mechanical Engineering Joginpally B.R Engineering College Hyderabad TS-500075 India

Machining is a globally used manufacturing technology where some part of metal is reduced from bulk workpiece in the chip form. In this thesis work, explores the science of new techniques of machining by two single point cutting tools simultaneous engaged with workpiece material to increase efficiency of the turning operation. In order to implement double tool turning process a normal lathe machine setup was altered. In turning operation, the process factors which affect machined surface quality of component are cutting speed, feed, and depth of cut. Investigation was trailed out to the improvements of productivity by this new machining technique under the influence of metal cutting factors on cutting temperature, tool wear. The morphology of chips and machining time were also studied. A comprehensive test was examined by utilising single and double tool turning process on mild steel work material. The analytically predicted metal cutting temperatures, cutting tool wear, machining time were investigated in detail. For the selected metal cutting conditions, it was recorded that the machining time reduced by 25% surprisingly which the production with this time ranges increased. Tool wear area measured by optical Profilometer shows that total wear zone 813.11mm2 for single tool turning while it was reduced to 45.57 mm2 for double tool turning.

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Reverse electrodialysis membrane for harvesting salinity gradient energy with and without spacer under natural wetland water

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AIP Conference Proceedings 2023年第1期2932卷

作者： Muthia Elma Dwi Resa Lamandau Siti Fatimah Satria Anugerah Suhendra Aulia Rahma Department of Chemical Engineering Faculty of Engineering Lambung Mangkurat University Jl. A. Yani KM 36 Banjarbaru 70714 Indonesia Materials and Membranes Research Group (M2ReG) Lambung Mangkurat University Jl. A. Yani KM 36 Banjarbaru 70714 Indonesia Environmental Science Doctoral and Postgraduate Program Lambung Mangkurat University Jl. Brigjen H. Hasan Basry Banjarmasin 70123 Indonesia

Salinity gradient energy (SGE) allows two solutions with different salt concentration to mixing and directly into electrical energy by reverse electrodialysis (RED) membrane. High power outputs are forecasted theoretically, but in real practice is still relatively low RED power efficiency. In this work, the spacer shadow effects on both membrane and solution compartment resistances are investigated by employing nylon spacer and without spacer. In addition, this experiment also proposes the power density performance of RED membrane under natural wetland water as low saline solution and variation of high saline solution i.e., artificial brackish water (0.3 wt% NaCl) and artificial seawater (3.5 wt% NaCl). The results indicate that the spacer shadow effect on RED membrane has a correlation with energy output generated. The used of spacer led to an increase in stack resistance and decrease in power density compared to without nylon spacer. This result increases the impact of RED renewable power source and brings it closer to practical implementation, especially for the potential natural wetland water as low saline solution. The power output was computed, obtaining a maximum power density of 0.19 W/m2 with variations without spacers, and 0.14 W/m2 with spacers. Results show that of the cell components directly influences the physicochemical principles governing the RED process and is closely related to the cell output parameters. In turn, it is possible to increase the performance of a RED cell by optimizing operation without spacers to avoid the shadow effect.

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A METHODOLOGY FOR EVALUATION OF SHIP FIRE SAFETY

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NAVAL ENGINEERS JOURNAL 1992年第3期104卷 104-113页

作者： SPRAGUE, CM RICHARDS, RC bLANCHARD, MA Chester M. Sprague:is a licensed mechanical engineer in the State of California and retired from over 20 years service as a commissioned officer in the Coast Guard. All of his duty assignments were in the naval engineering career field. Since joining CompuCon with offices at the Coast Guard Research and Development Center he has specialized in fire protection engineering and continued development of an analytical methodology to assess fire safety on Coast Guard cutters. He received his B.S. degree from the V. S. Coast Guard Academy in 1969 and M.S. degree in mechanical engineering from the U. S. Naval Postgraduate School Monterey Calif 1983. He is an associate member of ASME. Robert C. Richards:attended Cornell University where he received BS (1969) and MS (1971) degrees in materials science and engineering. During his graduate studies he worked for Grumman Aerospace Corporation in materials development. He then attended the U.S. Coast Guard Officer Candidate School and was commissioned in January 1971. He worked for the USCG Field Test & Development Center the USCG Research & Development Center the Marine Technical and Hazardous Materials Division of USCG Headquarters and the Marine Safety Laboratories. Since 1973 he has been a civilian fire protection engineer working in fire safety research. In November 1980 he was promoted to chief Marine Fire and Safety Research Division as a supervisory fire protection engineer. He is a member of the Society of Fire Protection Engineers and the American Society for Testing and Materials. LCdr. Marc A. Blanchard USCG: is currently assigned as chief Hull Mechanical and Electrical Section Naval Engineering Division USCG Headquarters. He is a graduate of the U.S. Coast Guard Academy (1977) and received his MS in ocean engineering from Stevens Institute of Technology (1983). He previously served as damage control assistant in USCGC Courageous and as engineer officer in USCGC Dallas. His shore assignments include the Third CG District Naval Engineering Branch and

The overall fire safety of a ship is not obvious. It is dependent on many factors including the vast number of fire scenarios that are possible. A means is required to evaluate a ship for the many types of fires it may be subjected to. The analysis should show what would happen if various alternatives such as protected cable trays, better fire boundaries, or improved fire detection had been used. The Ship Fire Safety engineering Methodology (SFSEM) provides an integrated framework for analyzing fires on ships in comparison to established fire safety objectives. It accounts for all relevant aspects;the behavior of fire, the effectiveness of passive design features, automated suppression systems, barrier materials, flame spread paths, and manual firefighting. The Ship Applied Fire engineering (SAFE) computer programs implement SFSEM and evaluate the probability of spaces and barriers limiting a fire. The evaluation is conducted on a compartment-by-compartment basis. It incorporates the fire growth hazard with the probabilities of ignition, automated fire suppression, manual fire suppression, and barrier effectiveness. SAFE calculates the probable paths of fire spread based on time durations. SFSEM/SAFE has been used successfully in a design application and in a retrofit situation.

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MASTER ORDNANCE REPAIR APPLIED - STANDARD ITEM 009-67

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NAVAL ENGINEERS JOURNAL 1986年第3期98卷 35-42页

作者： STIMSON, WA MARSH, MT UTTICH, RM William A. Stimsonreceived his B.S. degree in mathematics from the University of Texas at El Paso in 1964 and his M.S. degree in engineering from the University of Santa Clara in 1971. He served in the U.S. Army Artillery during the Korean Conflict and subsequently was employed at IBM Huntsville Alabama until 1968 where he worked in the design of automatic control systems of the Saturn vehicle. From 1968 until 1971 he was employed at Ames Research Center Moffett Field in the design of nonlinear control systems for sounding rockets and pencil-shaped spacecraft. Following this Mr. Stimson worked at Hewlett Packard Sunnyvale California as a test engineer in automatic test systems. Since 1973 Mr. Stimson has been employed at the Naval Ship Weapon Systems Engineering Station Port Hueneme. He was a ship qualification trials project supervisor for many years and is now serving as master ordnance repair deputy program manager. Mr. Stimson is a member of the American Society of Naval Engineers and is program chairman of the Channel Islands Section. Cdr. Michael T. Marsh USNreceived a B.S. in mathematics from the University of Nebraska and was commissioned via the NESEP program in 1970. He holds an M.S. in computer science from the U.S. Navy Postgraduate School and an MBA from the State University of New York. Cdr. Marsh has served in the weapons department of USSFrancis Hammond (FF-1067) and of USSJohn S. McCain (DDG-36). He was weapons officer aboard USSSampson (DDG-10). As an engineering duty officer Cdr. Marsh was the technical design officer for PMS-399 at the FFG-7 Class Combat System Test Center from 1978 to 1982. He is presently combat system officer at SupShip Jacksonville and has been active in the MOR program since its inception. Cdr. Marsh is also the vice chairman of the Jacksonville Section of ASNE. LCdr. Richard M. Uttich USNholds B.S. and M.S. degrees in mechanical engineering from Stanford University. He enlisted in the Navy in 1965 serving as an electronics technician aboard USSNereus (A

The 600-ship United States Navy offers private shipyards an unprecedented opportunity for overhaul of surface combatants with complex combat systems. Recognizing the new challenge associated with the overhaul of high technology combat systems in the private sector, the Navy in 1983 established the master ordnance repair (MOR) program. This program, a joint effort of the Naval Sea Systems Command (NAVSEA) and the Shipbuilders Council of America (SCA), was designed to identify and qualify those companies and private shipyards technically capable of managing combat systems work and conducting combat system testing. Standard Item 009–67 describes the role of the MOR company in combat system overhaul. It defines terms that are important to understanding the item itself, and imposes upon the prime contractor an obligation to utilize the MOR subcontractor in a managerial capacity. Specific tasks are assigned to the MOR company in planning, production, and testing. Finally, this standard item describes to the Navy planner how to estimate the size of the MOR team appropriate to the work package, a feature that will ensure that combat system bids are tailored to a specific availability.

关键词： WARSHIPS

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