tôi cao tần high frequency induction heating

Ngày tải lên: 22/04/2013, 11:13

Ngày tải lên: 19/08/2014, 05:09

... THIẾT BỊ TÔI CAO TẦN Tìm hiểu cao tần a) Nguyên lý chung - Tôi cao tần phương pháp nhiêt luyện làm thay đổi tổ chức, biến đổi tính tính chất khác theo phương hướng chọn trước - Tôi cao tần dựa ... 4.2.3- Lò cao tần (SP-35B/35AB) Hình 4.2.4- Lò cao tần với tần số cực cao (SPG – 30) Page 40 SVTH: BÙI VĂN HIỀN GVHD:TS LÊ THƯỢNG HIỀN Hình 4.2.5- Lò cao tần (SP-25BD/25ABD) Hình 4.2.6- Lò cao tần ... thiết bị luyện bánh a Nguồn cao tần XG-200KW Công Dòng điện Model Tần số Điện áp vào Biến áp suất vào tối đa XG-200 Cao Three-phase Tôi luyện 200KW 15-30KHz 300A tần 380-420V chuyên dụng b Thiết...

Ngày tải lên: 08/03/2015, 09:53

... theo dải tần số làm việc: - khuếch đại tần số cao (cao tần) - khuếch đại tần số thấp (thấp tần) - khuếch đại điện chiều Phân loại theo đại lợng đợc khuếch đại: - Khuếch đại điện áp: tầng khuếch ... tần số cần tính méo tần số thấp, méo tần số là: K tb Kt (4-13a) K tb Kc (4-13b) Mt = đây, Kt hệ số khuếch đại tần số thấp Méo tần số cao: Mc = đây, Kc hệ số khuếch đại tần số cao Trị số giới hạn ... khuếch đại nhiều tầng 2: tầng khuếch đại điện áp; 3: tầng khuếch đại trớc cuối; 4: tầng khuếch đại cuối Số lợng tầng khuếch đại điện áp định kích thớc giá thành khuếch đại Số tầng ít, khuếch đại...

Ngày tải lên: 11/05/2015, 21:10

... thuyết nhiệt luyện cao tần 33 2.3.1 Tôi cao tần (tôi c m ng điện từ) 33 2.3.2 Những đặc điểm ch yếu c a austenit t o thành nung nóng 35 dòng điện tần số cao 2.3.3 Chọn chế độ tần số Ch 35 ng TRÌNH ... nhiễu x mẫu cao tần với t = 10 giây 46 Hình 4.9: Đường nhiễu x mẫu cao tần với t = 15 giây 47 Hình 4.10: Đường nhiễu x mẫu cao tần với t = 20 giây 48 Hình 4.11: Đường nhiễu x mẫu cao tần với t ... mẫu cao tần với t = 30 giây 50 Hình 4.13: Đường nhiễu x mẫu cao tần với t = 40 giây 51 Hình 4.14: Đường nhiễu x mẫu cao tần với t = 50 giây 52 Hình 5.1: Mối quan hệ độ c ng (HRC) thời gian cao tần...

Ngày tải lên: 18/11/2020, 14:00

... value INDUCTION HEATING – RESONANT TANKS L L R Series resonant tank • High impedance at high frequency • Used with VSIs C R eBook for You C Parallel resonant tank • Low impedance at high frequency ... • Skin depth decreases when frequency increases • Frequency bands have been defined for IH: Supply -frequency: 50 – 540 Hz Medium frequency: 500 Hz – 50 kHz Radio frequency: 50 kHz – 10 MHz Microwave: ... flow Constant operating frequency Disadvantages Effect of stray inductance: limit on frequency, and physical cable length High switching losses Non-unity power factor, high harmonic distortion...

Ngày tải lên: 13/08/2014, 14:04

... my sister iv Nam Nguyen-Quang High- frequency matrix converters for induction heating To my mother v Nam Nguyen-Quang High- frequency matrix converters for induction heating Table of Contents Summary ... Nguyen-Quang High- frequency matrix converters for induction heating Introduction The research and development of radio -frequency matrix converter technology, for use in induction heating applications, ... Nguyen-Quang High- frequency matrix converters for induction heating factor The situation becomes worse in high frequency coils since the effect of the leakage inductance is more pronounced than in low frequency...

Ngày tải lên: 13/11/2014, 06:49

... logues The degree of high- frequency word entrainment predicts naturalness with an accuracy of 67% over a 50% baseline In Section we discuss experiments on the association of high- frequency word entrainment ... confirms the hypothesis that entrainment in highfrequency word usage is a good indicator of the perceived naturalness of a conversation Some of our 25 high- frequency words are in fact cue phrases, ... the degree of entrainment in high- frequency word usage, we examined 48 dialogues We computed the correlation coefficient between the game score (normalized by the highest achieved score for the...

Ngày tải lên: 08/03/2014, 01:20

... such as ‘and’, ‘is’, etc Our approach towards unsupervised pattern induction is to find such words and utilize them We define a high frequency word (HFW) as a word appearing more than TH times per ... and in all three a higher value indicates more symmetry M2 and M3 are obviously correlated, but they capture different aspects of a pattern’s nature: M is informative for highly interconnected ... manually provided patterns or words Pattern candidates are discovered using meta-patterns of high frequency and content words, and symmetric patterns are discovered using simple graph-theoretic...

Ngày tải lên: 23/03/2014, 18:20

... blood donors, digested with PstI and hybridized to probe A (Fig 3) in Southern blot experiments A high frequency of variation was found Only 131 out of the 295 (44%) DNA samples showed a restriction ... human gene encodes 16 proline-rich repeats is an oversimpli®cation and needs to be revisited This high frequency of variation in the BSSL gene corresponds very well with a previous study on incidence ... the most common molecular mass (donors D6 and D3) A single mother (donor D1) had a variant with higher molecular mass (160 kDa) than the most common one This mother also carried the 100 kDa variant...

Ngày tải lên: 24/03/2014, 03:21

... and high frequency (> 30 Hz) SSVEP-based Brain-Computer Interfaces (BCI) are principally focused on the low and medium range of frequencies whereas there are only a few projects in the high- frequency ... easier its detection The weakest SSVEP is found in the high frequency range However, spontaneous EEG (considered here as noise) decrease in higher frequency bands, hence, the signal to noise ratio ... classified into three ranges: low (up to 12 Hz), medium (12-30) and high frequency (> 30 Hz) [1] In general, the SSVEP in low frequency range has larger amplitude responses than in the medium range...

Ngày tải lên: 19/06/2014, 08:20

... use of pharmacological treatment [8] and levodopa has been shown to increase postural sway [9] High frequency deep brain stimulation (DBS) in the subthalamic nucleus (STN) was introduced as a complement ... (months) DBS parameter settings1 Right (amplitude: V, pulsewidth: μs, frequency; Hz) Left (amplitude: V, pulsewidth: μs, frequency; Hz) Localization of the contacts with negative polarity Right ... hemisphere L-dopa equivalents are calculated as in one of our previous studies [13] Higher scores on the PASE [28,29] reflect higher level of physical activity The mean PASE score norm for healthy men...

Ngày tải lên: 19/06/2014, 08:20

... without BRCA1 mutation resemble BRCA1 families may be related to the lower age of onset and higher frequency of high grade tumors overall for breast cancer in this population The characteristics of ... heterozygotes BRCA1 tumors tended to be of higher grade in both populations, as expected; however, Algerian non-BRCA1 cases included a significant excess of high grade tumors (p < 0.001) Significantly ... Algeria were also of significantly higher grade, presented more positive nodes and were less frequently ER-positive than French non-BRCA tumors This excess of high- grade tumors in African populations...

Ngày tải lên: 08/08/2014, 17:20

... surgical adjunct [4,7-11] Recently, the clinical applicability of a new commercially available, high- frequency electromagnetic field (EMF) system has been demonstrated [12], and specific handling ... growth [14] Though, it has to be emphasized that there is a difference between radiofrequency hyperthermia producing heating of a whole tumor, and an electromagnetic Page of (page number not for citation ... Safavi-Abbasi MD, Krischek B, Feigl GC, Lüdemann W, Mirzayan MJ, Samii M, Tatagiba M, Heckl S: The use of high- frequency electromagnetics in brain tumour surgery Eur J Surg Oncol in press Oct 22, 2007 Orel...

Ngày tải lên: 09/08/2014, 07:21

... displaying the highest frequency (63.5%) (see Figure 1) Internal organ involvement was associated with varying degrees of corticosteroid use Lung fibrosis was associated with the highest frequency ... sclerosis < 0.0001) The frequency of organ involvement associated with the use of immunosuppressive agents varied considerably Lung fibrosis was associated with the highest frequency (44.4%; 236/531), ... frequency of use The high rate of side effects caused by cyclosporine, which, in addition, has repeatedly been reported to induce renal crisis in SSc patients [23], can also explain the low frequency...

Ngày tải lên: 09/08/2014, 13:22

... that delivers small bursts of high flow respiratory gas into the lung at high rates It is classified as a pneumatically-powered, pressure-regulated, time-cycled, high- frequency flow interrupter ... Figure Arterial partial pressure of oxygen increasing after high frequency percussive ventilation treatment Figure The patient before high frequency percussive ventilation H O on CV to 27 cm H O ... The patient after high frequency percussive ventilation treatment 14 PIP (cm H2O) 1:1 1:1 0.8 1:1 0.6 The high peak inspiratory pressure (PIP) level does not indicate a very highpressure level,...

Ngày tải lên: 11/08/2014, 02:21

... Province lies along the south coast of Caspian Sea which seems the high rate of close relative marriage in this area, is the cause of high frequency of thalassemic patients The sera were collected from ... in table The mean age and frequency of males were significantly higher in healthy blood donors (P < 0.0001) Conversely, the means of AST and ALT were significantly higher in thalassemic patients ... group Frequency of SENV-D, SENV and co-infection viremia was significantly higher among thalassemic patients than healthy blood donors Conversely, there was no significant difference in the frequency...

Ngày tải lên: 12/08/2014, 04:21

... considerations highlight the need for therapies that clear airways of mucus in the acute management of asthma and COPD [7-11] High frequency chest wall oscillation (HFCWO) creates high velocity, ... high frequency chest compression and conventional chest physiotherapy in hospitalized patients with cystic fibrosis Am J Respir Crit Care Med 1994, 150:1154-1157 Fink J, Mahlmeister M: High- frequency ... patients (e.g., post-BD spirometry) or non-response (e.g., problems with patient recall) HFCWO = high frequency chest wall oscillation, BMI = body mass index, Post-BD FEV1= postbronchodilator forced...

Ngày tải lên: 12/08/2014, 14:20

... injury, induced with high PIP combined with high lung volume, is markedly attenuated when alveolar collapse is prevented by the application of PEEP [10,26] In addition, high tidal volume ventilation ... Miyasaka K: Role of high- frequency ventilation in sufactant-depleted lung injury as measured by granulocytes J Appl Physiol 1994, 76:539-544 Dreyfuss D, Soler P, Basset G, Saumon G: High inflation ... ± 0.3) × 105 ‡ BAL = bronchoalveolar lavage; CMV = conventional mechanical ventilation; HFO = high- frequency oscillatory ventilation *Before ventilation; †after h ventilation; ‡P

Ngày tải lên: 12/08/2014, 18:20