# Spherical surfaces

Xem 1-8 trên 8 kết quả Spherical surfaces
• ### Working with Wireframe and Surface Design Workbench

Learning Objectives After completing this chapter you will be able to: • Create wireframe geometry. • Create extruded surfaces. • Create revolved surfaces. • Create spherical surfaces. •

• ### Real Functions of Several Variables - Examples of Surface Integrals Calculus 2c-8

Tham khảo sách 'real functions of several variables - examples of surface integrals calculus 2c-8', khoa học tự nhiên, toán học phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

• ### Study on peptizability of boehmite and its application for the peparation of -al2o3 in spherical shape

This paper presents the results of the peptizability of boehmite and its application for the preparation of -Al2O3 in spherical shape. The obtained -Al2O3 in spherical shape has high mechanical resistance and high surface area. The water vapor adsorption ability of sphere of - Al2O3 has also been determined. -Al2O3 in spherical shape can adsorb moisture up to 65% of their weight.

• ### MICROSTRIP ANTENNA

In the last 40 years, the microstrip antenna has been developed for many communication systems such as radars, sensors, wireless, satellite, broadcasting, ultra-wideband, radio frequency identifications (RFIDs), reader devices etc. The progress in modern wireless communication systems has dramatically increased the demand for microstrip antennas. In this book some recent advances in microstrip antennas are presented.

• ### Đề tài " Stability and instability of the Cauchy horizon for the spherically symmetric Einstein-Maxwell-scalar field equations "

This paper considers a trapped characteristic initial value problem for the spherically symmetric Einstein-Maxwell-scalar ﬁeld equations. For an open set of initial data whose closure contains in particular Reissner-Nordstr¨m data, o the future boundary of the maximal domain of development is found to be a light-like surface along which the curvature blows up, and yet the metric can be continuously extended beyond it. This result is related to the strong cosmic censorship conjecture of Roger Penrose. ...

• ### Polymer nanocomposites

Polymer nanocomposites are commonly defined as the combination of a polymer matrix and additives that have at least one dimension in the nanometer range. The additives can be one-dimensional (examples include nanotubes and fibres), two-dimensional (which include layered minerals like clay), or three- dimensional (including spherical particles). Over the past decade, polymer nanocomposites have attracted considerable interests in both academia and industry, owing to their outstanding mechanical properties like elastic stiffness and strength with only a small amount of the nanoadditives.

• ### Báo cáo " Nghiên cứu tổng hợp Nano sắt bằng phương pháp hoá học "

In this article, iron nanoparticles were synthesized by reduction of FeCl3.6H2O 0,045M using NaBH4 0,25M. Characteristics of obtained iron particales were studied by Transmission Electron Microscopy (TEM), X-ray diffraction method (XRD) and BET specific surface area, and maximum benzen adsorption. The TEM results of synthesized iron nanoparticales show that iron particles are spherical in shape and connected in chains, the particale size is about 3 - 50nm. The X-ray results show that synthesized nanoparticles is iron at 44.720.