Institutional Repository

: Advances in Understanding Supersonic Jet Screech: Review and Perspective; Screech tones are produced by imperfectly expanded jets under certain conditions. This paper provides an overview of developments in the field of supersonic jet screech. The overview includes a historical background, summary of recent developments, and a critical assessment of our current understanding of screech. The subject material has been categorized as described in the table of contents given below. (C) 1998 Elsevier Science Ltd.

: Magnetic Recorder with Pressure Shoe for Record Members; Sponsorship: Armour Research Foundation of Illinois Institute of Technology, United States Patent, United States Patent

: Magnetic Transducer System and Method; A magnetic transducer head having a coupling gap of controllable effective longitudinal dimension. In one embodiment a gap spacer of magnetic material is energized by bias current and/or signal current during recording while being deenergized during playback to provide a larger coupling gap for recording than for playback. Recording gap size may be controlled dynamically, or a very high frequency bias current such as 100 mhz may be supplied to the magnetic gap spacer. A magnetic head may have a zero gap dimension when the magnetic gap spacer is deenergized to prevent any substantial residual external field. An electro-magnetic transducer head with the electric circuit portion including a path through the electrically conductive magnetic corepiece at the transducer gap, thus concentrating the gap field and mininizing core losses at very high bias or signal frequencies., Sponsorship: IIT Research Institute, United States Patent

: Continuous Antisolvent Crystallization Process and System Using Plug Flow Reactors; A process and system for continuous crystallization of a compound using antisolvent addition in which a solution is prepared with an organic compound and a solvent. An antisolvent is added to the solution in a continuous plug flow system comprising at least one process module. The antisolvent can be added in multiple addition points such that the overall amount of antisolvent added to the continuous plug flow reactor remains fixed. The multiple addition point technique provides every process module with an equal volume of antisolvent. Finally, crystals are recovered from the slurry upon exiting the system. Preferably, the mean crystal size is less than 100 μm., Sponsorship: Illinois Institute of Technology, United States Patent, Primary US Patent Classification 117/68, US Patent Classification 117/69, US Patent Classification 117/70, International Patent Classification C30B29/54

: Nickel Base Alloys and Process for their Manufacture; Sponsorship: IIT Research Institute, United States Patent

: DYNAMIC BEHAVIOR OF PERIODIC FEEDBACK-CONTROL SYSTEMS; Periodic feedback is a control strategy implemented by fast zero-average oscillations in the parameters of the control law. It is well known that time invariant feedback control offers no means for zeros relocation. Periodic feedback allows zeros relocation in an asymptotic sense, resulting in improved closed loop characteristics, such as increased gain margins., Endnote format citation

: Electro-Osmotic Production of Hydrocarbons Utilizing Conduction Heating of Hydrocarbonaceous Formations; An electro-osmotic method for the production of hydrocarbons utilizes in situ heating of earth formations having substantial electrical conductivity. A particular volume of an earth formation is bounded with a waveguide structure formed of respective rows of discrete elongated electrodes in a dense array wherein the active electrode area and the row separation are chosen in reference to the deposit thickness to avoid heating barren layers. Electrical power is applied at no more than a relatively low frequency between respective rows of electrodes to deliver power to the formation while producing relatively uniform heating thereof and limiting the relative loss of heat to adjacent regions to less than a predetermined amount. At the same time the temperature of the electrodes is controlled near the vaporization point of water to maintain an electrically conductive path between the electrodes and the formation. A heat sink is provided by supplying aqueous liquid electrolyte to space between the electrodes and the adjacent formation, thereby maintaining the temperature thereat no greater than about the boiling point of water and maintaining a conductive path between said formation. A d.c. polarized potential is applied to enhance flow of reservoir fluid into a preselected row of electrodes, and collected reservoir fluids are removed from the electrodes in the preselected row., Sponsorship: IIT Research Institute, United States Patent

: Content Provision for Wireless Devices (Spring 2001) IPRO 356: Content Provision for Wireless Devices IPRO356 Spring2001 Final Presentation; Personal Digital Assistants (PDAs), cellular phones, and other wireless devices represent the new paradigm for personal communication and interactivity. This project would involve the creation of an application (or series of applications) that would enable secure access to corporate databases via these devices. Hence, individuals such as consultants working in remote locations can submit timesheets, access corporate knowledge centers etc. While salespeople or contractors can access inventory nformation, request inventory or service conveniently, without the hustle involved in, for example, booting up a laptop, dialing into the corporate network and then performing these tasks. The end result may be a lightweight corporate portal that can be accessed using these wireless devices. This project will give students an opportunity to explore new media devices other than those already being studied in the curriculum (i.e., PCs, and application development for PCs). This will also provide students, specifically within engineering, with insight into the new wireless standards currently being tested, e.g. GSM vs. CDMA vs. TDMA vs. 3G technology, for content provision on cellular phones., Sponsorship: IIT Internal R&D in conjunction with the Ed Kaplan Entrepreneurial Studies Program, Project Plan for IPRO 356: Content Provision for Wireless Devices for the Spring 2001 semester

: Magnetic Transducer Head with Auxiliary Means for Diverting Residual Flux; A magnetic head is shown having auxiliary core material in a substantially unstressed condition with very low direct current coercivity and located within the working magnetic core for diverting magnetic flux due to residual magnetization of the main core of the head away from the record medium path. Crossfield magnetic heads, offset pole magnetic heads, and composite core magnetic heads with windings for different frequency ranges are also disclosed., Sponsorship: IIT Research Institute, United States Patent

: Automatic Stop for Magnetic Recorders; Sponsorship: Armour Research Foundation of Illinois Institute of Technology, United States Patent

: Transducer Machine; Sponsorship: IIT Research Institute, United States Patent

: Crop to Cup Coffee: Building Communities through Coffee (Semester 2) IPRO 333; The mission of IPRO 333 is to assist the Crop to Cup Company with the design and building of an enclosure for a temporary storage facility within the vicinity of their largest producing farming zone for robusta coffee in the Mbale region of Uganda. The sponsor, along with the team, has decided that the best method for addressing the local and global needs of the farmers is to present the research and design personally. Therefore, IPRO 333 will be fundraising to help finance the forthcoming trip to Uganda to present to the farming communities., Sponsorship: Jacob Elster Crop to Cup, Deliverables

: Magnetic Transducer Head; Sponsorship: Armour Research Foundation of Illinois Institute of Technology, United States Patent

: Coupling of Twin Supersonic Jets of Complex Geometry; Fundamental issues about the coupling of twin supersonic jets of complex geometry are examined. It is shown that screech tones from twin rectangular nozzles with double-beveled exit geometries can couple. Unlike coupling of twin rectangular jets of uniform geometry, the coupling here is more intricate because simultaneous multiple frequencies with a different spanwise modal structure are present. The coupling produces two frequencies, one of which is lower than the screech frequency of either jet. Although many coupling modes are kinematically permissible, the twin jets prefer two specific modes, and in some cases these two coupling modes coexist at different frequencies. Despite the geometric complexity we can effectively predict frequencies of tones from both single and twin coupled jets using the waveguide approach. It is hoped that these results and insights will assist those simulating screech for the purpose of tailoring shock-containing complex twin jets that minimize sonic fatigue failure of aircraft structures.

: Batch process monitoring and its application to polymerization systems; Slight changes in raw material properties or operating conditions during critical periods of operation of batch and semi-batch polymerization reactors may have a strong influence on reaction mechanism and impact final product quality. Online process monitoring, fault detection, fault diagnosis, and product quality prediction in real-time ensure safe reactor operation and warn operators about excursions from normal operation that may lead to deterioration in product properties. Multivariate statistical process monitoring and quality prediction using multiway principal components analysis and multiway partial least squares have been successful in detecting abnormalities in process operation and product quality. When abnormal process operation is detected, fault diagnosis tools are used to determine the source cause of the deviation. Illustrative case studies are presented via simulated polyvinyl acetate polymerization., Endnote format citation for DOI:10.1002/masy.200450210

: IIT Sustainability Branding (Semester Unknown) IPRO 311; This is a continuing IPRO with the overall aim of improving and enhancing the image of Illinois Institute of Technology, both as an institution and a physical campus, in regards to sustainability and “green” practices. To that end, the current semester is focused on several design projects based on concepts generated in the previous semesters along with input from the current semester to enhance a new “green” campus. We will also be providing information on how IIT is currently acting in a sustainable fashion and how students on campus can contribute to our image as a sustainable campus, Deliverables

: Transducer System Adaptable for Audio or Video Recording or Reproduction; A magnetic transducer system for selective audio or video operation with movable guides for shifting the tape path between audio, video, and rewind positions, or with fixed guides defining both an audio and video tape path, the audio tape path being clear of the video head, for example. A video transducer with a receptacle removably receiving and providing external energization for a battery powered audio transducer unit. An audio/video cartridge transducer arrangement for selective operation with audio and video cartridges of different configuration, preferably using a common capstan element., Sponsorship: IIT Research Institute, United States Patent

: Effect of Asymmetric Manipulations in Autocatalytic Networks; In this paper, we show that heterogeneous networks can be configured and reconfigured to operate in flexible spatial patterns The concept is demonstrated by using a square grid of continuous stirred tank reactors with nearest neighbor interactions and hosting multiple cubic autocatalytic species Asymmetry is introduced in the system by allowing for different feed flow rates in the reactors. A heterogeneous system offers expanded phase space, improved stability. and coexistence characteristics The advantages of asymmetry are studied using bifurcation diagrams, continuation studies. and dynamics, Endnote format citation for DOI:10.1021/ie901096v

: Hemoglobin Multiple Emulsion; A multiple emulsion of aqueous oxygen carrying material in oil in outer aqueous phase is suitable for provision of oxygen for oxygen transfer processes. A hemoglobin multiple emulsion in physiologically compatible oil in an outer aqueous saline solution is provided in sufficiently small droplet size to provide oxygen flow through blood vessels to desired body tissues or organs thereby providing a blood substitute. A process is provided wherein hemoglobin, a fragile material, is formulated into high hemoglobin content water-in-oil-in-water multiple emulsions while maintaining high yields and high oxygen exchange activity., Sponsorship: Illinois Institute of Technology, Sponsorship: Northfield Laboratories, Inc., United States Patent

: Creating a Contemporary and Dynamic Science Fair Bank for Chicago Public Schools (Semester Unknown) IPRO 330; IPRO 330 has one clear and main purpose: to increase high school student interest in Science and Mathematics in Chicago Public Schools. This is a very lofty and broad goal, so IPRO 330 has chosen to use the Chicago Public School Science Fair program as a vehicle to achieve this purpose. IPRO 330 is a continuing IPRO, meaning that we have a foundation and a base of work that has already been accomplished. As a result, one of the project goals of this team will be to obtain in-depth feedback from professionals within IIT, from Chicago Public Schools, and certainly from other professional education venues as well. Specifically, we will be looking to obtain feedback from the three most involved sources in high school students’ lives: students, teachers, and parents. This may be the most vital part of our project, because we want to make sure that our projects and guides are of high quality and high interest to high school students. IPRO 330 has an existing bank of Science Fair projects and guides which are located on the website sciencefair.math.iit.edu. In an effort to make our website more effective and more appealing, we will have team goals to create more Science Fair projects, and guides which will target areas that Chicago Public High School Students typically have trouble addressing, such as data analysis. We feel like the guides are a way to really implement more mathematics into the Science Fair program as a whole. In addition, there will be a group of students in our IPRO focused on improving the website and implementing new projects. IPRO 330 will address these objectives by first having all members, including faculty advisors, attend and judge a Chicago Public School Science Fair. This will allow everyone working on this project to get a better sense of what we are working on, make some contacts with teachers and Science Fair Coordinators, and even get feedback from students who used the website as a resource for their project. After this initial phase, the group will break up into three teams, an infrastructure team, a communication team, and a project and guides team. In these sub teams, IPRO 330 will be able to more effectively deal with more specific issues that arise, Deliverables

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