Abstract: An electric motor apparatus is described that utilizes a Halbach array and a ferrofluid core. The electric motor comprises a rotor assembly and a stator assembly, each of which utilizes a Halbach array. A ferrofluid core is utilized in the stator, which results in a motor that is less susceptible to core loss and operates with increased efficiency.

Abstract: An electric motor apparatus is described that utilizes a Halbach array and a ferrofluid core. The electric motor comprises a rotor assembly and a stator assembly, each of which utilizes a Halbach array. A ferrofluid core is utilized in the stator, which results in a motor that is less susceptible to core loss and operates with increased efficiency.

Abstract: An electric motor apparatus is described that utilizes a Halbach array and a ferrofluid core. The electric motor comprises a rotor assembly and a stator assembly, each of which utilizes a Halbach array. A ferrofluid core is utilized in the stator, which results in a motor that is less susceptible to core loss and operates with increased efficiency.

Abstract: A computer-implemented system automatically analyzes an electronic document that is a representation of an essay, and it automatically generates localized feedback for specific text spans within the essay. The localized feedback relates to the text span's impact on the overall quality of the essay. The system does this by generating scores for the essay both with and without the text span, and determining an impact value representing the difference between the probable scores. The system then uses the impact value to identify a comment that is appropriate for the text span's impact value.

Abstract: An electric motor apparatus is described that utilizes a Halbach array and a ferrofluid core. The electric motor comprises a rotor assembly and a stator assembly, each of which utilizes a Halbach array. A ferrofluid core is utilized in the stator, which results in a motor that is less susceptible to core loss and operates with increased efficiency.

Abstract: A computer-implemented system for predicting a grade, score or other class value for an essay receives a corpus of training essays, wherein each essay is a response to a common prompt. For each training essay, the system receives a class value and extracts feature values for each of a group of features. The system then uses the information learned from the training essays to build a model by assigning a probability to each of various combinations of the class values and feature values. When the system then receives a candidate essay, it extracts a set of the feature values from the candidate essay and applies the model to the feature values extracted from the candidate essay to determine a probable class value for the candidate essay.

Abstract: A polarity independent set of battery jumper cables for jumpering a first battery to a second battery includes a relative polarity detector for detecting whether two batteries are configured cross or parallel, a three-position high current capacity crossbar pivot switch responsive to the relative polarity detector for automatically connecting the plus terminals of the two batteries together and the minus terminals of the two batteries together regardless of whether the configuration detected is cross or parallel, and an undercurrent detector and a delay circuit for returning the device to its ready and unconnected state after the device has been disconnected from one of the batteries. The crossbar pivot switch includes two pairs of contacts, and a pivot arm that pivots about two separate points to ensure full electrical contact between the pairs of contacts. The invention can also be used to produce a battery charger that may be connected to a battery without regard to the polarity of the battery.