Massachusetts Institute of Technology

University of Texas System

The General Hospital Corporation

Pulse Secure, LLC

Robin Singh

Brian W Anthony

Anuradha Murthy Agarwal

Danhao Ma

Peter X Su

Athena Yeh Huang

Kishore K Mohanty

Kanti Varanasi

Galit Hocsman Frydman

Krishna Panthi

Bochao Zhao

Jason Yang

Alexander Tyler Jaffe

Aaron Michael Zakrzewski

Zijun Wei

Naji Abdulla

Maulik D Majmudar

Mohamad Ali Toufic Najia

Tracer eluting proppants, such as proppants that have polymeric coatings on them that include tracers, such as a fluorescent dye. The tracer eluting proppants can comprise proppant particles coated with a polymeric coating that can elute tracer under some, but not all conditions. For example, the tracer can be eluted at elevated temperature, pH, and/or salinity conditions, but not elute at lower temperature, pH, and/or salinity conditions. Methods of making and using tracer eluting proppants are also disclosed, including methods for characterizing subterranean reservoirs.

Tracer eluting proppants for hydraulic fracturing

A photonic aerosol particle sensor includes a microfluidic sensor chamber in which is disposed a plurality of photonic waveguide resonators each having a photonic waveguide on an underlying substrate, along a separate waveguide resonator path with a lateral width different than that of other photonic waveguide resonators. All waveguides in the plurality have a common vertical thickness of a common waveguide material having a refractive index that is larger than that of the underlying substrate material. An optical input connection couples light into the waveguide resonators. An aerosol particle input fluidically connected to the microfluidic chamber fluidically conveys aerosol particles to the chamber, and an aerosol particle output fluidically connected to the microfluidic chamber fluidically conveys aerosol particles out of the chamber. At least one optical output connection accepts light out of the plurality of photonic waveguide resonators to provide a signal indicative of at least one aerosol particle characteristic.

Physical and chemical characterization of aerosols with photonic waveguides

A microscale photoacoustic sensor uses the detection of ultrasound waves generated by a sample in response to incident light absorption to perform photoacoustic spectroscopy, imaging, and microscopy. The microscale photoacoustic sensor, including components to excite a sample and detect ultrasound waves, may be integrated onto a single chip. The microscale photoacoustic sensor may excite a sample using a metasurface collimator. The metasurface collimator includes an array of diffraction grooves to collimate an excitation beam uniformly out of the plane of the sensor to create a wide and homogeneous beam spot. The microscale photoacoustic sensor may detect ultrasound waves using an optical photoacoustic transducer. The optical photoacoustic transducer includes a resonator on a mechanical membrane to detect ultrasound waves with high sensitivity. The microscale photoacoustic sensor may be used in applications such as deep-tissue neural imaging or microfluidic biological screening.

Microscale photoacoustic spectroscopy, imaging, and microscopy

A private network includes a plurality of network security appliances participating in authenticating end users. Each network security appliance maintains a locally stored user list. A first network security appliance receives at least a portion of a non-local user list comprising second user identifier records for a second network security appliance of the plurality of network security appliances. The first network security appliance compares the local user list with the non-local user list received from the second network security appliance to identify one or more deviations. The first network security appliance merges the portion of the second user identifier records of the non-local user list corresponding with the one or more deviations with the first user identifier records of the local user list to generate an updated local user list. The first network security appliance authenticates a request to access the network using the updated local user list.

Device and method for tracking unique device and user network access across multiple security appliances

A photonic aerosol particle sensor includes a plurality of photonic waveguide resonators each having a photonic waveguide disposed along a separate waveguide resonator path and each photonic waveguide having a lateral waveguide width different than the waveguide width of other photonic waveguide resonators in the plurality. All waveguides in the plurality of photonic waveguide resonators have a common vertical thickness and are formed of a common photonic waveguide material. An optical input connection couples light into the waveguide resonators. A particle input conveys aerosol particles toward the waveguide resonators and an aerosol particle output conveys aerosol particles away from the waveguide resonators. At least one optical output connection is optically connected to accept light out of the plurality of photonic waveguide resonators to provide a signal indicative of at least one characteristic of the aerosol particles to be analyzed.

Devices, systems, and methods of the present disclosure are directed to accurate and non-invasive assessments of anatomic vessels (e.g., the internal jugular vein (IJV)) of vertebrates. For example, a piezoelectric crystal may generate a signal and receive a pulse echo of the signal along an axis extending through the piezoelectric crystal and an anatomic vessel. A force sensor disposed relative to the piezoelectric crystal may measure a force exerted (e.g., along skin of the vertebrate) on the anatomic vessel along the axis. The pulse echo received by the piezoelectric crystal and the force measured by the force sensor may, in combination, non-invasively and accurately determine a force response of the anatomic vessel. In turn, the force response may be probative of any one or more of a variety of different characteristics of the anatomic vessel including, for example, location of the anatomic vessel and pressure of the anatomic vessel.

Non-invasive assessment of anatomic vessels

Growing community of inventors

Cambridge, MA, United States of America

Robin Singh