Xem 1-20 trên 639 kết quả Density
  • The density matrix offers an effective technique for dealing statistically with a system consisting of many electrons using the quantum theory for an electron. Amixed state consisting of a statistical distribution of various quantum states can be specified by a set of probabilities pj with which the electron is found in a quantum state j ji.

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  • Low-density parity-check (LDPC) codes are forward error-correction codes, first proposed in the 1962 PhD thesis of Gallager at MIT. At the time, their incredible potential remained undiscovered due to the computational demands of simulation in an era when vacumm tubes were only just being replaced by the first transistors. They remained largely neglected for over 35 years. In the mean time the field of forward error correction was dominated by highly structured algebraic block and convolutional codes.

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  • Mật độ từ khóa (Keyword density) là một trong những khái niệm cơ bản nhất trong SEO. Vì thế nếu muốn tìm hiểu SEO và triển khai một chiến dịch SEO hiệu quả bạn cần nắm rõ khái niệm này. Tôi xin trích dẫn nguyên văn định nghĩa này từ wikipedia. Keyword density is the percentage of times a keyword or phrase appears on a web page compared to the total number of words on the page.

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  • The Committee on High Energy Density Plasma Physics was established in April 2001 by the National Research Council’s (NRC’s) Board on Physics and Astronomy to identify scientific opportunities and develop a unifying theme for research on matter under extreme high energy density conditions.

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  • In Design of high density transformers for high frequency high power converters, the abovementioned issues of high-frequency transformers are explored, particularly in regards to high-power converter applications. Loss calculations accommodating resonant operating waveform and Litz wire windings are explored. Leakage inductance modeling for large-number-of-stand Litz wire windings is proposed. The optimal design procedure based on the models is developed.

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  • The objective of study was to evaluate some of the physical and mechanical properties of medium density fiberboard (MDF) panels laminated with veneer sheets compressed at different levels of pressure and temperature. Rotary peeled veneer samples of European beech (Fagus orientalis Lipsky) were compressed at temperatures of 150 C, 180 C, and 200 C using 4 MPa and 6 MPa pressure for 8 min. Commercially produced MDF samples also were laminated with such compressed veneer sheets.

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  • A series of commercially manufactured medium density fiberboard (MDF) panels were exposed to a post-manufacture heat-treatment at various temperatures and durations using a hot press and just enough pressure to ensure firm contact between the panel and the press platens. Postmanufacture heat-treatment improved surface roughness of the exterior MDF panels. Panels treated at 225C for 30 min had the smoothest surface while the roughest surface was found for the control panels.

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  • Effect of wollastonite nanofibers on the improvement of thermal conductivity coefficient of Medium-Density Fiberboard (MDF) was studied here to find a possible solution to decrease hot-press time as a bottle-neck during composite production. Nanowollastonite was applied at 10%, based on the dry weight of wood fibers. Density of the control MDF boards was 0.66 g/cm3. Thermal conductivity coefficient was measured using an apparatus based on Fourier’s Law for heat conduction.

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  • Lecture Engineering electromagnetics: Electric flux density, Gauss’ law and divergence include all of the following content: Electric flux density, gauss’ law, divergence, Maxwell’s first equation, the vector operator, the divergence theorem.

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  • This work aims to calculate the effective atomic number and electron density by Monte Carlo method. In previous studies, the most widely used solution is to use the transmission method with the narrow gamma-ray beam.

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  • A comparative study of effect of substrate temperature (Ts) on the critical current density (Jc) in YBa2Cu3O7-x (YBCO) superconducting films is reported. YBCO superconducting films were fabricated by using the pulsed laser deposition (PLD) technique. The substrate temperature was ranged from 720 to 800 oC in order to find its optimum value for depositing YBCO films.

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  • Objectives: To investigate the changes of bone mineral density (BMD) and their relationship with some risk factors in female patients with rheumatoid arthritis (RA). Subjects and methods: A cross-sectional descriptive study on 49 female patients with RA, who had average age of 58.16 ± 7.15 years.

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  • In this paper, use the classical model of Congestion Charging to study the issues of pricingcharges in Ho Chi Minh City. In order to capture the traffic flow, we adopt the Drake speed - density model, which relies on the relationship of speed, density and flow and is further conducted by monitoring the traffic flow. After collecting the base traffic data of Ho Chi Minh City, we analyzed the relationship among speed, density and flow.

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  • This book is dedicated to thermoset resins, an important class of polymer materials. Unlike thermoplastics, thermoset resins are characterised by a curing reaction, which converts the low molecular weight liquid resins (easy to process) into solid three- dimensional network structures. The main advantage of a thermoset over a thermoplastic is that a wide range of properties can be achieved by simply adjusting the crosslink density of the thermoset network...

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  • Densities of some common substances at standard

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  • Tác dụng của kính lọc ND là làm giảm cường độ ánh sáng đi vào ống kính. Sau khi gắn kính lọc ND, nếu giữ nguyên độ mở ống kính thì tốc độ chụp sẽ chậm lại, nếu giữ nguyên tốc độ chụp thì ống kính phải mở rộng hơn. Các bạn có thể xem bảng dưới đây.

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  • SV : Tạ Công Hưng MSSV : 0612510 Kinh Tế Lượng Bài Tập 3 Thực hiện mô hình hồi quy tuyến tính với BUSTRAVL theo INCOME, POP, DENSITY. Mô hình : 2. Vẽ đồ thị phần dư của mô hình hồi qui ở câu a) với BUSTRAVLt (trục hoành) để kiểm tra hiện tượng phương sai thay đổi. Dựa vào đồ thị nhận xét về hiện tượng phương sai sai số thay đổi:

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  • There are many contents in this book: physical properties of pure substances, vapor pressures of pure substances, vapor pressures of solutions, physical and chemical data, water-vapor content of gases, densities of pure substances, densities of aqueous inorganic solutions at 1 atm, densities of aqueous organic solutions, densities of miscellaneous materials, physical and chemical data, specific heats of miscellaneous materials, properties of formation and, combustion reactions.

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  • Phần 1 với thiệu các kiến thức về sharpness editor PR, nâng cấp ảnh, hướng dẫn sử dụng radial density PR, làm mịn da với Power Retouche, hiệu chỉnh da, ghép ảnh và tạo khung, nâng cấp ảnh, chuyển ảnh trắng đen sang màu. Mời các bạn cùng tham khảo.

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  • Forests play a major role in global carbon (C) cycle, and the carbon density (CD) could reflect its ecological function of C sequestration. Study on the CD of different forest types on a community scale is crucial to characterize in depth the capacity of forest C sequestration.

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