stresses in heads due to internal pressure
pressure vessel design manual
... distribution in a thick-walled vessel due to internal pressure c The stress variation of the radial stress due to internal pressure in thick-walled vessels d Discontinuity stresses at stiffening or ... no resistance to bending When the wall offers resistance to bending, bending stresses occur in addtion to membrane stresses In a vessel of complicated shape subjected to internal pressure, the ... consideration in reducing discontinuity stresses In order to find the state of stress in a pressure vessel, it is necessary to find both the membrane stresses and the discontinuity stresses From...
Ngày tải lên: 02/04/2014, 16:47
Linear Minimum Mean-Square-Error Transceiver Design for Amplify-and-Forward Multiple Antenna Relaying Systems
... division multiplexing (OFDM) system over frequency selective fading channels Again, the forwarding matrix at relay and equalizer at destination are jointly designed by minimizing the total MSE of ... Engineering for all its support to postgraduate students, including the departmental conference grant Finally, I am seriously indebted to my parents and my wife for their love My wife, Ms Xingyuan ... division multiplexing (OFDM) system over frequency selective fading channels Again, the forwarding matrix at relay and equalizer at destination are jointly designed by minimizing the total MSE of...
Ngày tải lên: 20/11/2012, 11:31
hybrid metal oxide and multiwall carbon nanotube films for low temperature gas sensing
... before injecting into the measurement chamber, by means of a gas chromatography syringe, the required volume corresponding to the lowest concentration of the gas to be measured Fifteen minutes ... at a pressure of 0.1 Torr, using two different powers 30 and 100 W, while the processing time was adjusted to 10 A controlled flow of oxygen was introduced inside the chamber 2.4 Gas sensing measurements ... FISNAR Inc., USA) The as-deposited sensing films were dried at 170 ◦ C for h in order to burn out the organic vehicle and after that annealed in situ at 400 ◦ C for h in ambient atmosphere During...
Ngày tải lên: 19/03/2014, 16:48
Metal Foams: A Design Guide pptx
... transverse to the axial logarithmic strain increment ž Hydrostatic compression tests are performed increasing the pressure in increments of 0.1 MPa and recording the corresponding volumetric strain, ... nickel-based alloys Making metal foams 11 2.4 Gas-releasing particle decomposition in semi-solids Foaming agents can be introduced into metals in the solid state by mixing and consolidating powders Titanium ... consolidated by HIPing, by vacuum sintering, or by liquid-phase sintering Liquid-phase sintering may be the preferred approach for some alloys since it avoids the compressive distortions of the thin-walled...
Ngày tải lên: 28/03/2014, 16:20
báo cáo hóa học:" Mid-term results and factors affecting outcome of a metal-backed unicompartmental knee design: a case series" pptx
... monocompartmental knee disease The initial pain relief and function restoration achieved by UKA appear to be comparable to TKA and HTO [1] Compared to TKA, the main perceived or real advantages ... compromising the outcomes, although caution may be warranted in patients with very high body mass index pending additional data to confirm our results Competing interests No external financial ... footprint and this bone fragment was removed The leg was brought into extension to assess alignment Next, femoral cuts were made and sized relative to the tidemark to avoid patellofemoral impingement...
Ngày tải lên: 20/06/2014, 04:20
Metal Foams: A Design Guide docx
... transverse to the axial logarithmic strain increment ž Hydrostatic compression tests are performed increasing the pressure in increments of 0.1 MPa and recording the corresponding volumetric strain, ... nickel-based alloys Making metal foams 11 2.4 Gas-releasing particle decomposition in semi-solids Foaming agents can be introduced into metals in the solid state by mixing and consolidating powders Titanium ... consolidated by HIPing, by vacuum sintering, or by liquid-phase sintering Liquid-phase sintering may be the preferred approach for some alloys since it avoids the compressive distortions of the thin-walled...
Ngày tải lên: 27/06/2014, 17:20
METAL FORMING – PROCESS, TOOLS, DESIGN pps
... temperature The stamping-forging processes are as follows: blanking, heating, drawing, finishing inner corner and axial upsetting, piercing Blanking Due to the thickness of bottom is 10 mm, the ... upsetting is a closed-die forging process Although the metal flow is different from that of tubing upsetting at beginning, the final upsetting force is similar to tubing upsetting force So, according ... upsetting a) Traditional processing Stamping-Forging Processing of Sheet Metal Parts 39 b) Stamping-forging processing Figure 10 Scheme of forming process 3.2 Material store-up for inner wall using...
Ngày tải lên: 29/06/2014, 13:20
Design, synthesis and applications of Metal Organic Frameworks
... showing the benzene-1,4-dicarboxylic acid linkers (top inset box) coordinated to zinc ion cluster joints (shown in blue in the bottom inset box) Tunability of the IRMOF framework One of the principle ... benzene-1,4-dicarboxylic acid linkers (top inset box) coordinated to zinc ion cluster joints (shown in blue in the bottom inset box) 16 Figure Comparison of the cubic structures of IRMOFs formed when linear aromatic ... imidazole in binding to metal ions In addition, the carboxylic acids were protected as the corresponding ethyl esters both to aid in coupling the imidazole group to the benzene ring, and to allow...
Ngày tải lên: 02/07/2014, 12:59
Hints on the use of Pro-Engineer for Sheet Metal Design docx
... library), together with a suitable bracket of your own devising, into a drive-unit assembly before inserting this into the overall robot, thus saving having to everything twice and minimising the ... easier to use sub-assemblies, rather than bringing loads of individual components into the top-level model For instance: 24 assemble the motor, shaft extension and wheel (already done in the ... references in assemblies and drawings Do a Family Table before inserting the model into either an assembly or a drawing! Evolving the Design Should the structure of the chassis need modifying, during...
Ngày tải lên: 14/08/2014, 11:20
towards a rational design for sustainable urban drainage systems understanding (bio)geochemical mechanisms for enhanced heavy metal immobilization in filters
... regulatory limit Thus, in the United Kingdom, treatment via SuDS is mandatory prior to discharge into nearby watercourses It is therefore not surprising that filter drains are increasingly being ... vegetation that allow for storage and conveyance of water and infiltration into the ground • Infiltration basin – depression of land that stores runoff water and allows infiltration into the ground over ... understanding of the underpinning processes and their relative importance remains poor, potentially leading to inefficient operation due to non-optimal design In general, the succeeding paragraphs summarize...
Ngày tải lên: 22/12/2014, 17:08
Design and applications of phosphine ligands to transition metal catalyzed reactions
... Phosphine-olefin ligand in Pd-catalyzed AAA reaction 157 Scheme 4.10 Phosphine-imine ligands in Pd-catalyzed AAA reaction 158 Scheme 4.11 Pd/phosphine-imine complexes 159 Scheme 4.12 Pd/phosphine-imine ... 4.6 Morimoto’s extension of Achiwa’s phosphine-amidine ligand 144 Scheme 4.7 Phosphine-amide ligands derived from amino acids 147 Scheme 4.8 Phosphine-olefin ligands derived from amino acids ... favorable than palladium catalysis in the 1,4-addition, likely due to is the tendency of formed palladium enonate intermeidates to undergo -hydride elimination, leading to the heck-type products and...
Ngày tải lên: 09/09/2015, 09:59
Theoretical understanding and design of supported metal heterogeneous nanocatalysts
... represent a mapping of the interacting many-electron system onto a system of noninteracting electrons moving in the KS effective potential due to all the 23 Chapter First-principles methods other ... significant when atomic number Z exceeds about 50 When the 1s orbital of Au shrinks, the s orbitals of higher quantum number have to contract in sympathy in order to maintain orthogonality In reality, ... psuedopotential to treat electron-ion interation, supercell to model periodic systems, and iterative scheme to minimize the total energy function These will be described in following sections In the Born-Oppenheimer...
Ngày tải lên: 09/09/2015, 10:15
DESIGN, SYNTHESIS AND PROPERTIES OF METAL COMPLEXES AND COORDINATION POLYMERS FOR 2+2 PHOTO CYCLOADDITION REACTIONS
... NUS) 1st China-India-Singapore Symposium on Crystal Engineering, NUS, Singapore August 2010 XXVII Introduction Chapter Chapter Introduction 1-1 Introduction 1.1 Chapter Crystal Engineering The beauty ... turned into gel in 1-15 hours and became powder after 25 hours of UV irradiation During photo dimerization, two CF3CO2H were eliminated due to the proton transfer from bpe-H+ to TFA ligand bonded to ... the incorporation of olefinic groups in spacer ligands, still it is challenging to align the olefin bonds, especially in monodentate or terminal ligand It is advantageous in making the terminal...
Ngày tải lên: 09/09/2015, 11:15
Temperature control design project
... 2.5 MẠCH NGUỒN……………………………………………….… 11 CHƯƠNG : THUẬT TO N PID ĐIỀU KHIỂN NHIỆT ĐỘ…… … 3.1 THUẬT TO N PID VÀ RỜI RẠC HOÁ…………………… … 3.2 ANTI – WINDUP …………………………………………… … 3.3 XÁC ĐỊNH THÔNG SÔ BỘ ... thuộc nhóm điều khiển kinh điển Mặc dù đời nhiều phương pháp điều khiển điều khiển thích nghi, điều khiển mờ, mạng-nơron nhiều thuật to n điều khiển phi tuyến, PID dùng nhiều to n điều khiển (nhiệt ... 330 – Khi PORTC = 0, lớp BE Transistor không phân cực, dòng qua MOC3020, triac không kích – Khi PORTC = 1, Transistor dẫn, ta thiết kế cho dòng qua OPTO MOC3020 từ – 20mA, mà : 10 SVTH :...
Ngày tải lên: 20/09/2015, 11:34
Complete oxidation of methane at low temperature over noble metal based catalysts
... experimental work needs to be done to evaluate the resistance of such platinum catalysts to sintering upon mild steam ageing and their resistance to sulphur containing compounds, in order to demonstrate ... size varying from to 13 nm (as determined by XRD line broadening) was prepared by carrying out reducing treatments in H2 at increasing temperatures (20–750 ◦ C) The activity per surface Pd atom (measured ... Suppressing H2 S allowed the activity to be only slightly recovered Pre-exposure of the catalyst to H2 S in air (24 h) at increasing temperatures (100–400 ◦ C) caused an increasing inhibiting effect...
Ngày tải lên: 08/10/2015, 22:56