Other

Tsi, Inc.

Phillips Petroleum Company

Beijing Didi Infinity Technology and Development Co., Ltd.

Aerosol Dynamics Inc.

Virginia Semiconductor, Inc.

Kenneth Farmer

Richard Remiarz

Michael D Jensen

Ted M Pettijohn

Brian K Conroy

Paola Giovanna Piacentini Baruffaldi

Max P McDaniel

Elizabeth Ann Benham

Joel L Martin

Gil R Hawley

Kathy S Collins

Syriac J Palackal

Anthony P Eaton

Steven Russel Spielman

Susanne Vera Hering

Christopher E Wittner

Gregory Stephen Lewis

Robert Caldow

Thomas G Digges, Jr

Sreenath Avula

Arantzazu Eiguren Fernandez

Daniel C Bjorkquist

Sean Morell

David Workman

Melissa Grose

Thomas Edward Kennedy

N Perry Cook

Hannah Farmer

Dan Bjorkquist

Various embodiments include methods and apparatuses to reduce false-particle counts in a water-based condensation particle counter (CPC). In one embodiment, a cleanroom CPC has three parallel growth tube assemblies. A detector is coupled to an outlet of each of the three parallel growth tube assemblies, and is used to compare the particle concentrations measured from each of the three growth tube assemblies with remaining ones of the three growth tube assemblies. An algorithm compares the counts from the three detectors and determines when the particles counted are real and when they are false counts. Any real particle event shows up in all three detectors, while false counts will only be detected by one detector. Statistics are used to determine at which particle count levels the measured counts are considered to be real versus false. Other methods and apparatuses are disclosed.

Reducing false counts in condensation particle counters

Various embodiments include methods and systems to measure and calibrate an optical particle spectrometer for reporting mass concentration. In one embodiment, an optical particle spectrometer is used to measure a concentration of particulate matter in a sampled particle-laden airstream. A particle diverter, in fluid communication with the spectrometer, diverts at least a portion of the particle-laden airstream at predetermined intervals. In one example, a mass filter receives the portion of the particle-laden airstream and filters a fraction of the particles within the airstream that are above a predetermined particle size. A mass sensor measures a mass of the fraction of the particles received from the mass filter or from the particle diverter and uses a calibration communication loop to provide the measured mass to the spectrometer to apply a correction factor to report mass concentration from the optical particle spectrometer. Other methods and systems are disclosed.

Particulate matter sensor and method therefor

Systems and methods are disclosed configured to identify a location where current or predicted ride requests exceed a threshold within a time period. Driver location information for one or more drivers is used to identify a driver to satisfy the identified current or predicted ride requests at the location that exceed the threshold within the time period. In response to determining that a driver has at least a first likelihood of accepting a ride request at the location within the time period, item content is selected using a history of establishments frequented by the driver. The selected item of content, associated with a token, is provided for presentation on a display to the driver. In response to determining that the identified driver accepted the ride request at the location within the time period, the token is enabled to be utilized by the identified driver at an entity.

Dynamic display of driver content

Various embodiments include composite wicks for ultra-low noise condensation particle counters (CPCs). In one embodiment, a composite wick includes a first porous material having a first pore density, with the first porous material further having a first surface and an opposing second surface. A second porous material is in fluid communication with the first porous material and has a first surface with an area substantially the same as an area of the first surface of the first porous material. The first surface of the second porous material is substantially in contact with the first surface of the first porous material. The second porous material has a pore density that is dissimilar the first pore density of the first material. The first material and the second material are configured to provide vapor from a liquid to a fluid-based particle counter. Other apparatuses are disclosed.

Composite wicks for low noise particle counting

Systems and methods are disclosed configured to receive a ride request from an application hosted on a device of a user. A vehicle is routed to a pickup location. A route is generated configured to navigate the vehicle to a destination. Sensor data indicative of ride quality is monitored while the vehicle is navigating the generated route, wherein the sensor data comprises data indicating at least how bumpy the ride is and/or whether a sudden braking event occurred. When an adverse ride condition is detected, a determination is made that a content item is to be transmitted to a display device. A geofence is generated about the destination using a user content interaction history. The first item of content is selected based at least in part on an identification of an establishments within the geofence. The selected item of content is transmitted to the display device and the user may be transported to the pickup location within the geofence.

Dynamic display of route related content during transport by a vehicle

A system includes a first and second condensation particle counter, each counter having an inlet port, a growth column, and an optical element for counting particles detected at the respective inlet ports. The counters are configured to include a wick in which the wick is wetted by water. A differential pressure sensor is coupled to the first inlet port and coupled to the second inlet port. The sensor is configured to provide a pressure signal. A processor is coupled to memory and configured to receive the first signal, the second signal, and the pressure signal and generate an output corresponding to a ratio of the first signal and the second signal and correlate the ratio with the pressure signal. A housing is configured to receive the first counter, the second counter, the differential pressure sensor, the processor, and the memory.

In situ respirator fit testing

Various embodiments include methods and apparatuses to reduce false-particle counts in a water-based condensation particle counter (CPC). In one embodiment, a cleanroom CPC has three parallel growth tube assemblies. A detector is coupled to an outlet of each of the three parallel growth tube assemblies, and is used to compare the particle concentrations measured from each of the three growth tube assemblies. An algorithm compares the counts from the three detectors and determines when the particles counted are real and when they are false counts. Any real particle event shows up in all three detectors, while false counts will only be detected by one detector. Statistics are used to determine at which particle count levels the measured counts are considered to be real versus false. Other methods and apparatuses are disclosed.

An improved centrifugal pump uses straight tubes or fluid channel members rather than expanding passages between the inlet and exit flow. In straight tubes a process occurs of building up of pressure faster than within the passages as the fluid attempts to expand due to the Coriolis force potentially acting against the centrifugal force to build up the pressure within and along the tube or fluid channel. Because the flow increases faster than increases in RPM a more compact pump is provided that can move more air and produce higher pressures than ordinary centrifugal pumps. Hence: 1) Flow increases proportional to tube area because a larger area means more air can be drawn into the tube; 2) Flow increases proportional to tube length because the exit pressure increases proportional to tube length; and 3) Flow increases faster than increases in RPM, thereby exhibiting a higher outflow pressure.

Compact centrifugal apparatus for conveying a fluid

This invention provides catalyst compositions that are useful for polymerizing at least one monomer to produce a polymer. This invention also provides catalyst compositions that are useful for polymerizing at least one monomer to produce a polymer, wherein said catalyst composition comprises contacting a organometal compound/organoaluminum mixture, a treated solid oxide compound, and, optionally, a second organoaluminum compound. The solid oxide has been treated with an electron-withdrawing compound, in particular a chlorine, preferably zinc chloride and carbon tetrachloride.

Organometal catalyst compositions

A process is provided which comprises preparing heterogeneous or homogeneous catalyst systems comprising cyclodisilizane complexes of Group IV metals wherein said metal is selected from consisting of titanium, zirconium and hafnium; and a cocatalyst selected from the group consisting of methylaluminoxane and fluoro organic boron compounds and mixtures thereof. This invention also provides polymerization processes comprising contacting a mono-1-olefin, and optionally one or more higher alpha-olefins, in a reaction zone with cyclodisilizane complexes of Group IV metals catalyst systems and in the presence of a cocatalyst selected from the group consisting of aluminoxane, fluoro organic boron compounds, and mixtures thereof are provided.

Polymerization catalysts and processes therefor

A technique of bonding a thin wafer layer to a substrate. The wafer is blown dry using an inert gas to prevent it from being damaged, while still ensuring that it dries completely. The initial bonding is done by orienting crystallographic axes, and then allowing the wafers to adhere to one another slowly. The contact wave is prevented from spreading, by a divider between the two wafers. The wafers are allowed to adhere to one another slowly to form a bond. The bond is strengthened by annealing.

Method of formation of thin bonded ultra-thin wafers

A safety display sign includes a wire post member having spaced apart wire legs extending from a rounded end portion. The wire legs extend through the channels of a corrugated polyethylene sign panel, and project therefrom a sufficient distance to permit secure fixation in the ground. An extruded polyethylene base member is provided with two slotted passages integrally formed at opposite side edges of the base member to receive and grip the wire legs in a unitary assembly which prevents the sign panel from sliding along the length of the wire legs. The polyethylene base is positioned along the length of the wire legs and is urged against the edge of the sign panel by the ground or other supporting surface to secure the sign panel at the top portion of the post.

Display sign

The compound (Cp*.sub.2 YCl).sub.2 wherein Cp* is pentamethylcyclopentadienyl and its preparation and use for the polymerization of olefins is disclosed.

Growing community of inventors

Lake Elmo, MN, United States of America

Kenneth Farmer