Michael L Ortiz

US Patent:

6876956, Apr 5, 2005

Filed:

Jan 26, 2000

Appl. No.:

09/491353

Inventors:

Fehmi Cirak - Pasadena CA, US
Michael Ortiz - La Canada CA, US
Peter Schroeder - Altadena CA, US

Assignee:

California Institute of Technology - Pasadena CA

International Classification:

G06F017/10
G06F007/60

US Classification:

703 2, 703 1, 345423, 345474

Abstract:

Thin-shell finite-element analysis based on the use of subdivision surfaces: (1) describing the geometry of a shell in its undeformed configuration, and (2) generating smooth interpolated displacement fields possessing bounded energy. No nodal rotations are used in the interpolation. The interpolation scheme induced by subdivision is nonlocal, i. e. , the displacement field over one element depends on the nodal displacements of the element nodes and all nodes of immediately neighboring elements. However, the use of subdivision surfaces ensures that all local displacement fields thus constructed combine conformingly to define one single limit surface.

US Patent:

20030074172, Apr 17, 2003

Filed:

Feb 6, 2002

Appl. No.:

10/071857

Inventors:

Michael Ortiz - La Canada CA, US
Alejandro Mota - Pasadena CA, US

International Classification:

G06G007/48

US Classification:

703/011000

Abstract:

The present invention relates to a head injury simulation system; specifically, the ballistic penetration of the skull by a projectile. In one or more embodiments of the present invention, the cohesive theories of fracture, in conjunction with the explicit simulation of fracture and fragmentation, is applied to finite element simulations of firearm injuries to the human cranium. The simulation explicitly reproduces the impact, the nucleation of fracture, the extension of damage, and the scattering of comminuted fragments. In one embodiment, the bullet-skull impact is obtained with an approximated version of a nonsmooth contact algorithm. In one embodiment, the explicit simulation of fracture nucleation and propagation is achieved by a self-adaptive fragmentation procedure. In one embodiment, the progressive decohesion of fractures is modeled by cohesive elements.

US Patent:

20180256922, Sep 13, 2018

Filed:

Mar 5, 2018

Appl. No.:

15/912359

Inventors:

- Pasadena CA, US
Morteza Gharib - Pasadena CA, US
Stefanie Heyden - Pasadena CA, US
Michael Ortiz - Pasadena CA, US
Mikhail G. Shapiro - Pasadena CA, US

Assignee:

California Institute of Technology - Pasadena CA

International Classification:

A61N 7/00
A61M 37/00

Abstract:

Systems and methods for targeting specific cell types by selective application of ultrasonic harmonic excitation at their resonance frequency (“oncotripsy”) are presented. The systems and methods result in the permeabilization, lysis, and/or death of targeted cell types by using ultrasonic harmonic excitations that have their frequency and pulse duration specifically tuned to disrupt the nuclear membrane of the targeted cells types by inducing a destructive vibrational response therein while leaving non-targeted cell types intact. Target cells may be neoplastic.

US Patent:

20160376192, Dec 29, 2016

Filed:

Sep 12, 2016

Appl. No.:

15/263157

Inventors:

- Pasadena CA, US
Anna Pandolfi - Pasadena CA, US
Michael Ortiz - La Canada CA, US

Assignee:

California Institute of Technology - Pasadena CA

International Classification:

C04B 14/34
C04B 24/28

Abstract:

Materials and methods for implementing engineered aggregates in metamaterials are provided. The engineered aggregates may be tuned to oscillate resonantly under the influence of an external force improving the dynamic performance of the metamaterial by impeding dynamic excitation. The engineered aggregate generally comprise a multilayer resonant structure having at least a relatively heavy inner core surrounded by at least a compliant coating layer. The geometry and stiffness of the relative layers can be tuned to engineer a desired resonant frequency response within the aggregate for a chosen frequency range. The engineered aggregates are disposed in a matrix material to form a metamaterial. The engineered aggregates may be disposed within a mortar matrix to form a concrete metamaterial suitable for use, for example, in structural applications, including bunkers, shelters, etc.

US Patent:

20140371353, Dec 18, 2014

Filed:

Jun 18, 2014

Appl. No.:

14/308347

Inventors:

- Pasadena CA, US
Anna Pandolfi - Pasadena CA, US
Michael Ortiz - La Canada CA, US

International Classification:

C04B 14/34
C04B 24/28

US Classification:

524 5, 524439

Abstract:

Materials and Methods for implementing engineered aggregates in metamaterials are provided. The engineered aggregates may be tuned to oscillate resonantly under the influence of an external force improving the dynamic performance of the metamaterial by impeding dynamic excitation. The engineered aggregate generally comprise a multilayer resonant structure having at least a relatively heavy inner core surrounded by at least a compliant coating layer. The geometry and stiffness of the relative layers can be tuned to engineer a desired resonant frequency response within the aggregate for a chosen frequency range. The engineered aggregates are disposed in a matrix material to form a metamaterial. The engineered aggregates may be disposed within a mortar matrix to form a concrete metamaterial suitable for use, for example, in structural applications, including bunkers, shelters, etc.

US Patent:

20140315093, Oct 23, 2014

Filed:

Apr 16, 2014

Appl. No.:

14/254824

Inventors:

- Pasadena CA, US
Michael Ortiz - La Canada CA, US
Lucas R. Meza - Pasadena CA, US
Lauren C. Montemayor - Pasadena CA, US
Jiao Wu - Rancho Cucamonga CA, US
Xun W. Gu - Pasadena CA, US

Assignee:

California Institute of Technology - Pasadena CA

International Classification:

H01M 4/72
G03F 7/20

US Classification:

429238, 430322

Abstract:

A scaffold includes struts that intersect at nodes. In some instances, a cross section of the cores has at least one dimension less than 100 microns. The core can be a solid, liquid or a gas. In some instances, one or more shell layers are positioned on the core.