past simple and past continuous exercises ppt

TChon 15 PRESENT PERFECT AND PAST SIMPLE TENSE.doc

... recently, don’t you think?6 My grandfather died 30 years ago. I (never/meet) him.4. Fill in the blanks with modals: must - have to - ought to - used to1. You wash your hands before meals.2. It’s ... seventeen. In the play, she must appear in a bright red dress and long black stockings. Last year in another play, she had to wear short socks and a bright, orange-colored dress. If anyone asks her ... the party?7. There are many clouds in the sky. It (rain) ….…… ……………………………6. Read the passage and answer the following questions: My aunt Nhan is an actress. She must be at least thirty-five....

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TCHON PERIOD 8 PRESENT SIMPLE, PAST SIMPLE AND PREPOSITIONS OF TIME.doc

Danh mục: Tiếng anh

... TOPIC 2: OUR PAST PERIOD 8: PRESENT SIMPLE, PAST SIMPLE AND PREPOSITIONS OF TIMEA. Theory:1. Present simple and past simple: Tenses Affirmation Negation InterrogationPresent simple S + am/ ... morning, Tuan and his father go jogging around Xuan Huong Lake. Hoa and her mother walked along Bui Thi Xuan Street and then visited the flower garden. Hoa liked it very much and the flowers ... ………………………………………………………………………………………………………………………………………………………………………………………………………………………….…………… V. Read the passage and answer question below:In the summer holidays, Mr. Hung, Mrs. Chi and their children, Tuan and Hoa often go to the beach for two or three...

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Sustainable Energy Harvesting Technologies Past Present and Future Part 2 ppt

Danh mục: Kĩ thuật Viễn thông

... Technologies – Past, Present and Future 8 Will-be-set-by-IN-TECHOutput messages and communicationA node Nidcan use the transmitter to broadcast a message m ∈ Message to the network usingthe command ... each other) and justthe physical state is changed. Otherwise, the abstract view of the new computational stateis computed and send to the neighbours, and both the computational and the physicalstates ... magnet and the coil. The magnetic field cut by the coil varies with the relative movement between the magnet and the coil. In the second type as shown in Fig. 2(b), the magnet moves in and out...

Sustainable Energy Harvesting Technologies Past Present and Future Part 3 pptx

Danh mục: Kĩ thuật Viễn thông

... vibration energy harvester is to widen its bandwidth. Most common methods to widen the bandwidth Sustainable Energy Harvesting Technologies – Past, Present and Future 30 Fig. 5. Comparisons ... two types of nonlinearity, i.e. hard nonlinearity and soft nonlinearity as shown in Fig. 10. It is worth mentioning that output power and bandwidth depend on the approaching direction of the ... – Past, Present and Future 46The minimum wind speed to make it work is 3m·s-1, where an output power less than 100μW was produced. The generator can produce output power of 0.2mW, 2mW and...

Sustainable Energy Harvesting Technologies Past Present and Future Part 5 pptx

Danh mục: Kĩ thuật Viễn thông

... Harvesting Technologies – Past, Present and Future 84parameters of macro generators C, D and E. Generators C, D, and E were tested for different acceleration levels and the vibration frequency ... Measured and calculated load power and estimated parasitic and electromagnetic damping of generator-C for 0.1g acceleration. Sustainable Energy Harvesting Technologies – Past, Present and Future ... damping Fig. 24. Measured and calculated load power and estimated parasitic and electromagnetic damping for generator A. In order to understand the parasitic damping effect and the optimum condition...

Sustainable Energy Harvesting Technologies Past Present and Future Part 8 pptx

Danh mục: Kĩ thuật Viễn thông

... time-varying power, bandwidth, and resource constraints.2. Network model and workload sustainabilityAny WSN can be modeled as a directed graph with vertices associated with network nodes and edges associated ... which represents the capacity (or bandwidth) of the link, and 133WSN Design for Unlimited Lifetime 0WSN Design for Unlimited LifetimeEmanuele Lattanzi and Alessandro BoglioloDiSBeF - University ... handles concurrent entities (Sim_entityobjects) running on separate threads and communicating through uni-directional channels140Sustainable Energy Harvesting Technologies – Past, Present and...

Sustainable Energy Harvesting Technologies Past Present and Future Part 11 pptx

Danh mục: Kĩ thuật Viễn thông

... polysilicon deposition and patterning Step 4: Sacrificial layer etching and releasing a free-standing structure Sustainable Energy Harvesting Technologies – Past, Present and Future 190 Roundy, ... fabricating and characterising free-standing thick-film piezoelectric cantilevers for energy harvesting. Firstly the research requires the understanding of the process conditions and limitation ... carrying out chemical and biological analysis, which Sustainable Energy Harvesting Technologies – Past, Present and Future 208 Fig. 14. Piezoelectric polyimide free-standing structure fabrication...

Sustainable Energy Harvesting Technologies Past Present and Future Part 12 ppt

Danh mục: Kĩ thuật Viễn thông

... Technologies – Past, Present and Future 212 [23] Jaffe, B., Cook Jr, W. R., Jaffe, H., J.P. Roberts, and P. Popper, Piezoelectric Ceramics. 1971, London: Academic Press Inc. [24] Giurgiutiu, V. and ... [37] Kok, S.L., White, N. and Harris, N. Fabrication and characterisatin of free-standing, thick-film piezoelectric cantilevers for energy harvesting. Measurement Science and Technology, 20(124010). ... magnetostrictive material. Smart Materials and Structures, 2008. 17(4): p. 045009. [5] Polla, D.L. and L.F. Francis, Processing and characterization of piezoelectric materials and integration into microelectromechanical...

Sustainable Energy Harvesting Technologies Past Present and Future Part 1 ppt

Danh mục: Kĩ thuật Viễn thông

... evaluate the past, investigate and think through the present and understand and plan for the future sustainable energy harvesting technologies. The key to success is to learn from the past and make ... Technologies – Past, Present and Future free online editions of InTech Books and Journals can be found atwww.intechopen.com Preface In the early 21st century, research and development ... algorithm, and to manage the receiving and sending of messages in the network.The model should capture that use of the sensor, receiver, transmitter and computational unitconsume energy and that...

Sustainable Energy Harvesting Technologies Past Present and Future Part 7 ppt

Danh mục: Kĩ thuật Viễn thông

... Peltier effect Qc1 and Qh1, Joule heat Qc2 and Qh2, heat conduction Qc3 and Qh3. In case of the Joule heat it is assumed that one half of it dissipates at the cold side and the other half ... heat sources, can be expressed by (9). In (10) and (11), boundary conditions for interfaces between heat source and Al2O3 as well as Al2O3 and copper strips are presented. 220dTdx= ... relating to the thermal domain and represent heat powers Qc at the cold side (15), and Qh at the hot one (16), while the last one comes from the electrical domain and represents an electrical...

Sustainable Energy Harvesting Technologies Past Present and Future Part 8 ppt

Danh mục: Kĩ thuật Viễn thông

... handles concurrent entities (Sim_entityobjects) running on separate threads and communicating through uni-directional channels140Sustainable Energy Harvesting Technologies – Past, Present and ... capability of handling other packets in the same timeunit) is decreased because of the energy, CPU, and bandwidth spent to process that packet.Given a generalized ﬂow network with vertices V and edges ... time-varying power, bandwidth, and resource constraints.2. Network model and workload sustainabilityAny WSN can be modeled as a directed graph with vertices associated with network nodes and edges associated...

Sustainable Energy Harvesting Technologies Past Present and Future Part 10 ppt

Danh mục: Kĩ thuật Viễn thông

... Harvesting Technologies – Past, Present and Future 172 3. Micro energies for micro devices and below An interesting limiting case of kinetic energy present in the form of random vibration is represented ... fixed standard deviation and correlation time 0.1 s. 7 Vibration Energy Harvesting: Linear and Nonlinear Oscillator Approaches Luca Gammaitoni, Helios Vocca, Igor Neri, Flavio Travasso and ... industrial plant equipment, moving structures such as automobiles and aeroplanes and structures such as buildings and bridges. Also human and ...

Sustainable Energy Harvesting Technologies Past Present and Future Part 14 ppt

Danh mục: Kĩ thuật Viễn thông

... temperature sensor with WLAN at 2.4 GHz (ISM band). An ISM band sleeve antenna is used for the transmission. Using the cellular band rectenna shown and discussed in Section 2.5.1, at least 3.14 ... in calculation and measurement. In Fig. 25 (left side graph) and (right side graph), we see in general that the input voltage is boosted and also that the patterns of Fosc and Vsn are comparable ... transmission. Fig. 26. The assembly and test platform for the proposed battery-free sensor transmitter. Sustainable Energy Harvesting Technologies – Past, Present and Future 254 The transmitter...