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AutoCAD is computer-aided design (CAD) software that is used for precise 2D and 3D drafting, design, and modeling with solids, surfaces, mesh objects, documentation features, and more. It includes features to automate tasks and increase productivity such as comparing drawings, counting, adding objects, and creating tables. It also comes with seven industry-specific toolsets for electrical design, plant design, architecture layout drawings, mechanical design, 3D mapping, adding scanned images, and converting raster images. AutoCAD enables users to create, edit, and annotate drawings via desktop, web, and mobile devices.\n"}]},"@type":"Question","name":"Who uses AutoCAD?","acceptedAnswer":["@type":"Answer","text":"AutoCAD is used by students, architects, designers, engineers, project managers, real estate developers, and construction professionals to create precise 2D and 3D drawings.\n"],"@type":"Question","name":"What is the difference between AutoCAD and AutoCAD LT? ","acceptedAnswer":["@type":"Answer","text":"AutoCAD LT is powerful 2D CAD software used for precision drafting and documentation. AutoCAD includes all the features of AutoCAD LT, plus additional features to benefit productivity such as 3D modeling and automation of repetitive processes. AutoCAD also lets you customize the user interface with APIs and add-on apps. With AutoCAD, users are able work more efficiently with seven industry-specific toolsets to enhance automation and productivity for tasks in architecture, mechanical design, electrical design, plant design, plumbing, converting raster images, geographic information systems, and 3D mapping.\n"],"@type":"Question","name":"Can I use AutoCAD for free?","acceptedAnswer":["@type":"Answer","text":"Yes. Students and educators can get free one-year educational access to Autodesk products and services, renewable for as long as you remain eligible. Learn more.\n"],"@type":"Question","name":"How do I download AutoCAD?","acceptedAnswer":["@type":"Answer","text":"Autodesk provides download and install instructions for individuals and administrators. Your available downloads appear in Autodesk Account. Find your product, select a version, platform, language, and download method. For more information, visit the Autodesk Knowledge Network.\n"],"@type":"Question","name":"Which versions of AutoCAD can I use if I subscribe to the current version? ","acceptedAnswer":["@type":"Answer","text":"Your AutoCAD subscription gives you access to install and use the three previous versions of AutoCAD. Available downloads are listed in your Autodesk Account after subscribing. See also previous releases available for subscribers.\n"],"@type":"Question","name":"Can I install AutoCAD on multiple computers? ","acceptedAnswer":["@type":"Answer","text":"With a subscription to AutoCAD software, you can install it on up to three computers or other devices. However, only the named user can sign in and use that software on a single computer at any given time. Please refer to the\u202fSoftware License Agreement for more information.\n"],"@type":"Question","name":"How do I convert my AutoCAD free trial to a paid subscription? ","acceptedAnswer":["@type":"Answer","text":"Launch your trial software and click Subscribe Now on the trial screen or buy AutoCAD here. When buying your subscription, enter the same email address and password combination you used to sign in to your trial. Learn more about\u202fconverting a trial to a paid subscription.\n"],"@type":"Question","name":"How much does an AutoCAD subscription cost? ","acceptedAnswer":["@type":"Answer","text":"The price of an annual AutoCAD subscription is\u202f\u202fand the price of a monthly AutoCAD subscription is\u202f. The price of a 3-year AutoCAD subscription is\u202f. If you have infrequent users and are interested in a pay-as-you-go option, please visit www.autodesk.com/flex to learn more.\n"]],"@type":"FAQPage","@context":" "} Architecture Engineering Construction Collection

Mr. Yang Liu is a seasoned executive with 15 years of experience in an array of industries including technology, finance and investment banking. Mr. Liu served as the Chairman of the board and the Chief Executive Officer of Color Star Technology Co. Ltd, a Nasdaq company, from March 2019 to July 2020. Through a series of acquisitions and dispositions, he successfully transformed the company from a traditional Chinese manufacturer into a global technology company in education and entertainment. He also served as the CEO at Wave Sync Corporation, an OTC technology company from July 2017 to August 2018.

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Microgrid stability studies have been largely based on small-signal linearization techniques. However, the validity and magnitude of the linearization domain is limited to small perturbations. Thus, there is a need to examine microgrids with large-signal nonlinear techniques to fully understand and examine their stability. Large-signal stability analysis can be accomplished by Lyapunov-based mathematical methods. These Lyapunov methods estimate the domain of asymptotic stability of the studied system. A survey of Lyapunov-based large-signal stability studies showed that few large-signal studies have been completed on either individual systems (dc/ac inverters, dc/dc rectifiers, etc.) or microgrids. The research presented in this thesis addresses the large-signal stability of droop-controlled dc/ac inverters and inverter-based microgrids. Dc/ac power electronic inverters allow microgrids to be technically feasible. Thus, as a prelude to examining the stability of microgrids, the research presented in Chapter 3 analyzes the stability of inverters. First, the 13 th order large-signal nonlinear model of a droop-controlled dc/ac inverter connected to an infinite bus is presented. The singular perturbation method is used to decompose the nonlinear model into 11th, 9th, 7th, 5th, 3rd and 1st order models. Each model ignores certain control or structural components of the full order model. The aim of the study is to understand the accuracy and validity of the reduced order models in replicating the performance of the full order nonlinear model. The performance of each model is studied in three different areas: time domain simulations, Lyapunov's indirect method and domain of attraction estimation. The work aims to present the best model to use in each of the three domains of study. Results show that certain reduced order models are capable of accurately reproducing the performance of the full order model while others can be used to gain insights into those three areas of

Aging dynamics was investigated in the glassy states of poly(2-chlorostyrene) by measuring the complex electrical capacitance during aging below the glass transition temperature. The variations with time and temperature of the ac dielectric susceptibility and volume could be determined by simply measuring the variation in the complex electrical capacitance. Isothermal aging at a given temperature for several hours after an intermittent stop in constant-rate cooling is stored in the deviations of both the real and imaginary parts of the complex ac dielectric susceptibility and volume. During cooling after isothermal aging, the deviation of the ac dielectric susceptibility from the reference value decreases and almost vanishes at room temperature. By contrast, the deviation in volume induced during isothermal aging remains almost constant during cooling. The simultaneous measurement of ac dielectric susceptibility and volume clearly revealed that the ac dielectric susceptibility exhibits a full rejuvenation effect, whereas the volume does not show any rejuvenation effects. We discuss a plausible model that can reproduce the present experimental results.

We calculate both analytically and numerically the ac susceptibility χ(ω) and the nonlinear electromagnetic response of thin superconductor strips and disks of constant thickness in a perpendicular time-dependent magnetic field Ba(t)=B0cos ωt, taking account of the strong nonlinearity of the voltage-current characteristics below the irreversibility line. We consider integral equations of nonlinear nonlocal flux diffusion for a wide class of thermally activated creep models. It is shown that thin superconductors, despite being fully in the critical state, exhibit a universal Meissner-like electromagnetic response in the dissipative flux-creep regime. The expression for the linear ac susceptibility during flux creep appears to be similar to the susceptibility of Ohmic conductors, but with the relaxation time constant replaced by the time t elapsed after flux creep has started. This result is independent of any material parameter or temperature or dc field. For ωt>>:1, we obtain χ(ω)-1+pln (qiωt)/(iωt), where p and q are constants. Above a critical ac amplitude B0=Bl, the local response of the electric field becomes nonlinear, and there are two distinctive nonlinear regimes at B0>Bl, where Bls(d/a)1/2Bp, Bp is a characteristic field of full flux penetration, s(T,B)=\\dln j/dln t\\ is the dimensionless flux-creep rate and d and a are the sample thickness and width, respectively. For Bl>:Bh. Here Bh(ω) weakly depends on ω and is of order (d/a)1/2Bp for a very wide frequency range, well

In this paper, we present ac susceptibility and magnetotransport measurements on aged single crystals of the ferropnictide parent compound, BaFe 2As 2 with a paramagnetic-to-antiferromagnetic transition temperature of 134 K. The ac susceptibility shows the clear onset of a partial diamagnetic response with an onset temperature, commensurate with a subtle downturn in resistivity at approximately 20 K. Below 20 K the magnetotransport shows in-plane anisotropy, magnetic-field history dependence and a hysteretic signature. Above 20 K the crystals show the widely reported high-field linear magnetoresistance. An enhanced noise signature in ac susceptibility is observed above 20 K, which varies in character with amplitude and frequency of the ac signal. The hysteresis in magnetoresistance and the observed sensitivity of the superconducting phase to the amplitude of the ac signal are indicative characteristics of granular or weakly linked filamentary superconductivity. Furthermore, these features taken together with the observed noise signature abovemore $$T_\\mathrmc$$ suggests a link between the formation of the superconducting filamentary phase and the freezing of antiphase domain walls, known to exist in these materials. less 2ff7e9595c