GypsumWorks Studio (no replies)   
I have known about mindat.org for many years but recently joined to better participate. I am a retired physicist with a strong background in the fields of solid state, crystallography, piezoelectricity, and materials science. I was elected a Fellow of the Acoustical Society of America in 2000 for my contributions to the field of transducers. I know quite a bit about sound generation, propagation, and detection in various media including solids.

One of my daughters is a geologist and when both daughters were living at home, we spent many years rockhounding around our province of Nova Scotia, Canada as a family. I still go on field trips and have set up a small research lab area plus a rock and mineral studio. I live near some of the best gypsum sites in Nova Scotia and have begun working with gypsum as an art material. I refer to my studio as GypsumWorks Studio and hope to post some gallery photos on this site once I become more familiar with uploading photos and creating galleries. I uploaded one photo successfully so it's a start.

Plan to write a few articles and get to know other users. I used to write HTML code so that will come back to me quickly.
Cheers, Dennis
          Heads up for Clojure library writers   

Clojure 1.7 is around the corner, we’re already at version 1.7.0-alpha3. Fortunately, the iterative approach of clojure taken since 1.3 means that upgrading from one version to the next usually only needs a change in your project.clj file (as well as working interop accross versions, which is always nice).

There are some neat changes in 1.7, the most notable being the addition of transducers. I recommend reading through the introduction to transducers at http://blog.cognitect.com/blog/2014/8/6/transducers-are-coming and the video from strange loop at https://www.youtube.com/watch?v=6mTbuzafcII.

A much smaller addition to 1.7 is the introduction of the update function in clojure.core. update is directly equivalent to update-in but operates on a single key.

When you wrote:

(-> input-map
    (update-in [:my-counter-key] inc))

You will now be able to write:

(-> input-map
    (update :my-counter-key inc))

This has been a long-wanted change and brings update on par with get, and assoc which have their -in suffixed equivalents.

One direct consequence of the change is that if you have a namespace that exposes an update function, you will need to deal with the fact that it will now clash with clojure.core/update since clojure.core is referred by default in all namespaces.

You have two strategies to deal with that fact:

  • Rename the function (which can be a bit intrusive)
  • Prevent clojure.core/update from being referred in your namespace

For the second strategy, you will only need to use the following form in your namespace declaration:

(ns my.namespace
 (:require [...])
 (:refer-clojure :exclude [update]))

If you don’t, your library consumers will have to deal with messages such as:

WARNING: update already refers to: #'clojure.core/update in namespace: foo.core, being replaced by: #'foo.core/update
WARNING: update already refers to: #'clojure.core/update in namespace: user, being replaced by: #'foo.core/update

          Recent Report Covers Upcoming Opportunities in Pressure Transmitters Market   

Pressure transmitters are sensors that generate analog or digital signals based on the amount of pressure applied over liquids or gasses. Pressure transmitters include an electronic amplifier and a pressure transducer in a single package so that measured data can be sent to long distances without introduction of electrical noise or loss of accuracy. For

The post Recent Report Covers Upcoming Opportunities in Pressure Transmitters Market appeared first on BizPR.us | US Free Press Release and Distribution center.


          Product Engineering – Technician 2   
MI-Pontiac, Technician 2 Responsibilities: Floor Support Working in Instrumentation and Equipment would expect to work in one or more of the following areas: Troubleshooting and repair of all items making up the test cell facility, including fuel systems, dynamometers, pumps, heaters, heat exchangers, collecting motor vibration data, filter replacement, installing and calibrating cell transducers, harness and
          Just because I like Top Gear doesn’t mean that I’m a Misogynist, or does it?    

When you read my blogs you would probably get the impression that I am a misogynist “Woman Hater” but you would be wrong, I am exactly the opposite! I can find a quality I like about even the most appalling Harpies. Over the years this has been my biggest downfall, and just because I like one quality doesn’t mean to say they don’t drive me mad with numerous other things I don’t like.

I think I’m a good host, I don’t ask a lot from a house guest or girlfriend, just two rules, don’t touch the remote controls, and when I’m watching a program, only talk during commercials, if you have something urgent to say Text me, now is that too much to ask? Just to clarify “You’re a shit boyfriend, I never want to see you again, and I’m going home “ is not an urgent message, I could get the gist from the, Tuts, the door slamming and the tyre squeal, without missing any of the program .

In my defence it’s imperative that you watch a Motoring Program (Top Gear) live because If I had a quid for every time I’ve sat down to watch a film or TV program that I set my video to record, and just before the end “somebody” has changed the channel and Coronation Street, Eastenders or some other drivel comes on, I would be a millionaire. Even Sky Plus Falls foul of the 8 Oclock weekdays phenomena when two equally shit Womens programs are broadcast on different channels, so instead of Wayne Carini in an Episode of Chasing Classic Cars, you get a message saying this “Program failed to record due to a Programming Conflict” (Which roughly translated means, we did manage to record your Girlfriends Programs But Hey, Have a Great Night!) ”

When a Womans watching a program, it’s like turning a shark on its back, (I watch The Discovery Channel a lot too) they go into an almost catatonic state, except for the odd “Bastard” muttered at the guy in the program who's done something to upset one of the female characters, then they give a sideways glance in your direction which really means “You even think of doing that and I will be after you with the kitchen scissors!

When you’re watching a program it’s a different thing, women can multitask, for multitasking substitute “do several things that annoy you all at the same time” they can read a magazine, hum a tune, and flick the pages over so fast that each page sounds like a whip crack. Incidentally did you know that a whip cracks, because the end is travelling faster than the speed of sound and it creates a mini Sonic Boom, if you didn’t know that, the chances are its because you were watching the program "Little Known Facts" with your girlfriend.

They don’t speak too often but when they do, it’s at the precise moment that Jeremy Clarkson is sharing some very important information and you miss it, no point in saying “shush” as that just makes things worse, “Shush, why Shush, what’s happening, what’s he talking about that’s so important that I’ve got to shush, has Richard Hammond invented a cure for Cancer? By which time you’ve missed what he was saying anyway and you are even more in the dog house. Then just when you don’t want it, it’s time to go to bed, and you get the Library treatment, which was precisely what you wanted when you were watching TV

 I have a pair of Bose “Quiet Comfort Noise Cancelling Headphones” which I always take on Holiday. They work by use of analog circuits or digital signal processing. Adaptive algorithms are designed to analyze the waveform of the background aural or nonauralnoise, then based on the specific algorithm generate a signal that will either phase shift or invert the polarity of the original signal. This inverted signal (in antiphase) is then amplified and a transducer creates a sound wave directly proportional to the amplitude of the original waveform, creating destructive interference. This effectively reduces the volume of the perceivable noise. Translated this means they eliminate the sound of the plane’s engines, and you don’t have to turn the volume of the in-flight movie up to an unacceptable level.

As I said before I really do like Women, it would probably be less stressful for me If I didn't and I was to become a Monk, but that’s not the life for me so In order to survive I believe that Mother Nature has taken pity on me and allowed my hearing to evolve. I seem to have developed noise cancelling ears. Although my hearing is perfect, my ears work in exactly the opposite way to my Noise cancelling headphones. I can hear every note of a Formula One cars engine as the gears change, the pitch alters and it screams down the track. Watching the opening sequence of Point Break, I can hear the next cartridge slide into the chamber as he cocks his pump action shotgun, in preparation for his next shot. I hear his bullet tear through the target and the hollow tinkling of a spent bullet casing ejected from Johnny Utah's (Keanu Reeves) semi automatic Sig Sauer P226 9 mm, as it hits the ground, bouncing  twice before it settles and becomes silent.




No matter how softly they talk, I never miss a word spoken by Jeremy, Richard, James, Tiff and Jason. If she’s sat opposite me I can see my girlfriend’s lips moving but I can’t hear a word she’s saying until the commercial break or 'Jessica' by the 'Allman Brothers' starts to play.

Noise cancelling ears do have a couple of disadvantages, and I must remember to write to the TV broadcasters and ask if they could put subtitles on the screen when Vicky Butler-Henderson is on Fifth Gear and the same when Rachel Riley is on The Gadget Show so that I know what they’re talking about.

          Thermal Control of a Dual Mode Parametric Sapphire Transducer   
Belfi, Jacopo and Beverini, Nicolò and Michele, Andrea De and Gabbriellini, Gianluca and Mango, Francesco and Passaquieti, Roberto (2009) Thermal Control of a Dual Mode Parametric Sapphire Transducer. arXiv .
          Electrical Journeyman - Bergelectric - San Diego, CA   
Feed to, pull into, and terminate wire and cable within control centers, distribution boxes, transformers, transducers, switch gear, receptacles, switches, etc....
From Bergelectric - Thu, 25 May 2017 02:37:59 GMT - View all San Diego, CA jobs
          Journeyman Wireman, Lead Man - Bergelectric - San Diego, CA   
Feed to, pull into, and terminate wire and cable within control centers, distribution boxes, transformers, transducers, switch gear, receptacles, switches, etc....
From Bergelectric - Wed, 17 May 2017 15:18:57 GMT - View all San Diego, CA jobs
          K&K Pure Mini Gold Strap Button   
available since 06.06.2017: K&K Pure Mini with Gold Strap Button (Pure Western Mini), passive 3-head transducer for steel-string acoustic guitars, to be mounted inside the instrument, with gold-coloured strap button / output...
117 € - item no. 415849

          Groundwall insulation damage localization of large generator stator bar using an active Lamb waves method   
Condition monitoring of stator insulation is significant for reliable operation of large generators. However, locating groundwall insulation damage in a stator bar using existing methods is difficult. A new groundwall insulation damage localization method based on active Lamb waves is proposed in this study to address this issue. Two piezoelectric (PZT) transducers are mounted on the surface of a stator bar; one PZT works as an actuator to generate Lamb waves and the other works as a receiver to capture the propagated Lamb waves. The Hilbert transform associated with a cross-correlation function is then used to extract the time of flight of the damage-scattered wave. Consequently, a one-dimensional location model is established to determine the insulation damage position in stator bar. The proposed method has been experimentally verified by detecting insulation damages in both the slot and end-winding stator bars dismantled from a 18 kV/300 MW generator. Results show that the proposed method can effectively locate insulation damage in stator bars with high precision. In addition, the proposed method exhibits good noise robustness to avoid interference.
          Navico 9-Pin Black to 7-Pin Blue Adapter Cable f/XID Transducers   
Navico 9-Pin Black to 7-Pin Blue Adapter Cable f\/XID Transducers

9-Pin Black to 7-Pin Blue Adapter Cable f/XID Transducers

Connects XSONIC Transducers to 7-Pin Blue Units

Price: $30.99


          Rock N Roll Story   
itunes pic
Todays Podcast talks about sound systems frequencies and how they relate ot a PA system. The ways the sound gets split up in to its different frequcency bands Sub Bass Mid & High. The different types of transducer used in a specific frequency band. A Description of the PA system used in the NIA is give as an example of what type of system is being used these days to provide our listening enjoyment. If you'd like any more info on the type of PA system used in the NIA heres the email of the UK Distributer. www.shuttlesound.com Also you might want to check out these web sites as well www.yamahaproaudio.com www.britanniarow.com There's a coversation I have with Mikey G at the NIA in Birmingham. Talking briefly about what the first things to happen at a gig. So tip the truck get the points, these are the specific poistions given to a Rigger( some one who goes in to the roof and assembles a safe flying point that can hold the requiered wieght of all the boxes that will be hung of it). We briefely talk about speaker postions what there called and some of the equipement at FOH (Front Of House) Enjoy
          (USA-LA-Morgan City) ROV Technician   
Company Profile Oceaneering is a global oilfield provider of engineered services and products primarily to the offshore oil and gas industry, with a focus on deepwater applications. Through the use of its applied technology expertise, Oceaneering also serves the defense, entertainment, and aerospace industries. Oceaneering’s business offerings include remotely operated vehicles, built-to-order specialty subsea hardware, deepwater intervention and manned diving services, non-destructive testing and inspection, and engineering and project management. Position Summary Responsible for operating ROV's in a safe and efficient manner, and maintaining and repairing all electronic, electrical, mechanical, and hydraulic systems and sub-systems associated with Remotely Operated Vehicles including component repair, replacement and troubleshooting. Duties & Responsibilities ESSENTIAL * Operate equipment, vehicle functions, cameras (video and Still), acoustic positioning system, sonar, manipulators (robotic arms), and LARS (Launch and Recovery Systems). * Assist or pilot the ROV including evaluating the environment conditions and hazards, dock/undock from TMS (tether management system), and navigate the ROV by acoustics, sonar and visual (video). * Perform maintenance/repairs on equipment: maintain/ repair electronics, maintain/ repair hydraulics, maintain/repair mechanics, use test equipment, calibrate and align equipment, and perform general housekeeping and corrosion control. * Will use power, video and data distribution equipment including: high voltage lines and transformers, phase, current, and voltage monitoring, ground fault protection circuits, sub-sea cameras, amplifiers, coaxial cables, video monitors, video converters, microprocessor controlled video switchers, modems, line drivers, serial ports, parallel port, termination of both multi-mode and single mode fiber-optic conductors and modems. Oil-filled sub-sea electrical enclosures including terminations of sub-sea tethers, main lift umbilical, oil-filled cables, cable splices and sub-sea rated one atmosphere lights. * Will use sub-sea navigational equipment including but not limited to magnetic compass, gyro, transducer, sonar, altimeter, and associated survey equipment. * Establishes and maintains parts and supplies associated with all electrical and electronics devices. * Integrates and operates ancillary tooling including but not limited to: hard & soft line cutters, pump units, injection skids, water pumps, and associated hydraulic systems. * Maintains parts and supplies inventory associated with all system mechanical and hydraulics assemblies and subassemblies. Qualifications REQUIRED * Minimum 1 year ROV experience. * High School Graduate or General Education Degree (GED), Technical/Associates degree preferred. * 12 months of formal mechanical and hydraulic training and 12 months of formal electrical and electronics training; or combination of education and experience from an ROV recognized school. * Must be able to obtain a valid Passport and Transportation Worker Identification Credential (TWIC Card). Additional Information **Working Conditions** This position is considered OFFSHORE WORK which is characterized as follows. * Outdoors and indoors, day and night, as well as over/near water. * Requires working on or near moving equipment and vibrating equipment. * Frequently the humidity is above 90%, noise is over 85 decibels and the light is intense/glare. * Potential exposure to open fire/flames/sparks. * Constant exposure to airborne dust, fumes, and gases. * Work surface is stable, height is elevated. **Physical Activity/Requirements** The physical demands described here are representative of those that must be met by an employee to successfully perform the essential functions of this job. Reasonable accommodations may be made to enable individuals with disabilities to perform the essential functions. This position is considered **HEAVY**work. Equal Employment Opportunity All qualified candidates will receive consideration for all positions without regard to race, color, religion, sex, age, national origin, veteran status, disability, political affiliation, marital status, sexual orientation, or other non-merit factors. *Job Title:* ROV Technician *Location:* Morgan City, Louisiana *Job ID:* 11847 *Regular/Temporary:* Regular *Full/Part Time:* Full-Time
          Tracy to Play Role in NIH Study of Molecular Changes during Physical Activity   
The National Institutes of Health (NIH) Common Fund has announced the first awards for its Molecular Transducers of Physical Activity in Humans Program, which will allow researchers to develop a comprehensive map of the molecular changes that occur in response to physical activity and uncover findings that could lead to people ...
          Raymarine E80, DSM30, VHF, Kenwood, all in a contender console box   
For sale Contender electronics box off 23T console with Raymarine E80 - navionics gold card Raymarine VHF Raymarine DSM30 box Transducer ...
          IN-SITU PRESSURE TRANSDUCER WITH CABLE REEL STERO-STAR   
IN-SITU PRESSURE TRANSDUCER WITH CABLE REEL STERO-STAR
           Parameters consideration in designing a magnetorheological damper    
S. A., Mazlan and H., Zamzuri and S., Chuprat (2012) Parameters consideration in designing a magnetorheological damper. In: International Conference in Materials and Applications for Sensors and Transducers (IC-MAST 2012), 24-28 May, 2012, Budapest, Hungary.
           Full factorial design to study material parameters of magnetorheological fluid    
Mazlan, S. A. (2012) Full factorial design to study material parameters of magnetorheological fluid. In: International Conference in Materials and Applications for Sensors and Transducers (IC-MAST 2012), 24-28 May 2012, Budapest, Hungary.
          Diag Med Sonographer - (Riverside, California, United States)   
Under general supervision, performs diagnostic ultrasound examinations and produces two & three dimensional ultrasonic recordings of internal organs which are used by physicians to diagnose diseases. Delineate both normal and abnormal human anatomy as well as pathological conditions in the organs of the abdomen, superficial structures such as the human breast and musculoskeletal, pelvis, gravid uterus and other areas of the human body as well as obstetrics (e.g., maternal uterus and Adnexa, fetal biophysical profile, amniocentesis), and interventional procedures such as biopsies, aspirations and drainage procedures. Essential Responsibilities: - Demonstrates competence in the operation of diagnostic ultrasound equipment, real-time and mobile, to obtain quality diagnostic images. - Performs specialized ultrasound exams/tests including but not limited to assisting physicians in sterile procedures, operating ultrasound equipment in the IR suite and/or other specialized applications such as localizations, aspirations and/or biopsies etc. - Consistently and at all times: Selects appropriate transducer and adjusts equipment controls according to organ of interest, depth of field and other specifications of test, moves transducer by hand over area of interest and observes sound wave display screen in order to evaluate quality of ultrasonic pattern produced. - Enters test data and patient information into ultrasound equipment and/or applicable computer system(s) to record scan results and diagnostic data. - Identifies and processes images and prepares images for physician interpretation. - Utilizes ultrasonic imaging devices (i.e., transducers, monitors) in order to produce optimized image quality. - Documents significant structures in accordance with the established department protocol including but not limited to: technical factors, patient variables, image annotation etc. - Documents clinical activity in a timely, comprehensive and accurate manner. - Maintains equipment, supplies and work area in accordance with department guidelines. - Demonstrates an understanding of the cognitive, physical, emotional and chronological maturation process in delivery of services to patients of the age group served. - Identifies the impact of cultural diversity and lifestyle choices on patient condition and makes accommodations for such differences. - Utilizes proper Body Mechanics. - Documents clinical activities and required image information in a timely, comprehensive, and accurate manner. - Observes all organizational, regional, medical service area and Diagnostic Imaging Department policies and procedures. - Maintains standards of professional behavior established to enhance quality of service. - Demonstrates effective communication skills. - Demonstrates professional behavior in all interactions with patients and staff. - Maintains equipment, supplies and work area in accordance with department guidelines. - May perform other duties as required and assigned.
          ECHO Sonographer II - (San Francisco, California, United States)   
Under the direction of the Imaging Services Director and Chief of Radiology/ Imaging Services, or other Clinical Service Director where applicable, produces two-dimensional ultrasonic recordings of internal organs for use by Physician in diagnosis of disease and study of malfunction of organs. Performs technological functions to ensure optimal diagnostic quality of patient care utilizing efficient and safe processes. A Dedicated Specialty Sonographer is defined as a Sonographer II, registered in one or two disciplines performed by the lab, whose permanent work assignment is in an area where the scope of practice and work is limited to ultrasound exams and procedures in one or two registry disciplines as defined by the ARDMS. Essential Functions: - Exhibiting a high degree of tact, courtesy, and poise, explains procedures to patient to reduce anxieties and obtain patient cooperation. - Prepares and positions patient for examination. - Selects equipment for use in ultrasound setup according to specifications of examination. - Selects transducer and adjusts equipment controls according to organ to be examined, depth of field, and other specifications of test. - Starts equipment that produces images of internal organs and records diagnostic data on magnetic tape, computer disk, strip printout, or film. - Moves transducer, by hand, over specified area of body and observes sound wave display screen to monitor quality of ultrasonic pattern produced. - Photographs images of organs shown on display module or removes strip printout from equipment to obtain permanent record of internal examination. - Keys test data and patient information into computer of ultrasound equipment to maintain record of test results. - Orients new hires. - Supervisory Responsibilities: This job has no supervisory responsibilities.
          Diag Imag Tech-Sonog-PD - (Harbor City, California, United States)   
Under indirect supervision, performs diagnostic ultrasound examinations & produces two-dimensional ultrasonic recordings of internal organs which are used by physicians to diagnose disease processes & delineate both normal & abnormal human anatomy as well as pathological conditions in the organs of the abdomen, superficial structures such as the human breast & musculoskeletal, pelvis, gravid uterus & other areas of the human body as well as obstetrics (e.g., maternal uterus & Adnexa, fetal biophysical profile, amniocentesis) & interventional procedures such as biopsies, aspirations & drainage procedures. Essential Functions: - Identifies the impact of cultural diversity & lifestyle choices on patient condition & makes accommodations for such difference - Demonstrates an understanding of the cognitive, physical, emotional & chronological maturation process in delivery of services to patients of the age group served - Demonstrates competence & understands the overall operational function of the department to include scheduling of patients appointments by telephone, mail, or in person utilizing OPAS - Prepares patients for examinations & explains procedures in order to ally apprehensions; consults w/ referring physician & radiologist regarding patient's medical history to determine the type of ultrasonic procedure required & to correlate patient's history w/ test to be performed - Demonstrates competence in the operation of diagnostic ultrasound equipment, real-time & mobile, to obtain quality diagnostic images - Performs special application exams/tests such as assisting physicians in sterile procedures such as surgery, operating ultrasound equipment in surgery & during special applications such as localizations, aspirations and/or biopsies - Selects transducer & adjusts equipment controls according to organ of interest, depth of field & other specifications of test; moves transducer by hand over area of interest & observes sound wave display screen in order to evaluate quality of ultrasonic pattern produced - Keys test data & patient information into ultrasound equipment computer to record test results & diagnostic data on magnetic tape, computer disk, strip printout or film; photographs images of organs shown on display module - Identifies & processes images & prepares images for interpretation; discusses test results w/ physician - Utilizes ancillary devices such as selective transducers, monitors, images; scans areas/regions of interest using B-mode, M-mode & real time techniques optimizing display parameters & recorded images ; notes significance of structures displayed & recognizes artifacts & equipment limitations - Operates various ultrasound emitters to scan pertinent anatomical areas & records the signal response in a photographic or other mode - Produces quality, diagnostic images taking into account transducer selection, technical factors, patient variables, image annotation, evaluation & selection of representative images, criteria for diagnostic quality, artifacts & improvement of sub-optimal images - Documents clinical activity in a timely, comprehensive & accurate manner - Observes all applicable regional, medical center, & department policies & procedures - Maintains standards of professional behavior established to enhance quality of service - Demonstrates effective communication skills - Demonstrates professional maturity in all interactions w/ patient & staff - Maintains equipment, supplies & work area in accordance w/ department guidelines
          CMOS-Integrated Array Transducers For High-Frequency Ultrasonic Imaging   
CMOS-Integrated Array Transducers For High-Frequency Ultrasonic Imaging Simpson, Eric One of the challenges in the fabrication of array transducers suitable for high-frequency ultrasonic imaging is providing electrical connections between the array elements and external systems such as pulser and beamforming circuits. Element connectivity is difficult due to the fine element pitch, as well as strict limitations on the physical size of the probe required for some high-frequency imaging applications such as intravascular ultrasound (IVUS) imaging. Previously, channel reduction has been demonstrated through single-element or partially-sampled array transducers that are mechanically translated during image acquisition. These systems offer ease of fabrication and connectivity due to their low channel count, however, the reliance on mechanical scanning is undesirable. This thesis presents the proof-of-concept of a new type of high-frequency array transducer that maintains the low system complexity associated with a reduced channel count, while at the same time offers the ability to electronically scan an active array pattern. A unique feature of this design is the presence of a custom scanning application-specific integrated circuit (ASIC), which is fully integrated into transducer stack. The ASIC reduces the number cables required by multiplexing a collection of array elements into a small number of channels. To allow for simplified methods of fabrication, two novel substrate bonding techniques are demonstrated that allow full integration of the scanning ASIC into the acoustic stack while not relying on the precise alignment of the two substrates. The integration schemes were demonstrated using a 68 element linear array that includes a custom scanning ASIC in the acoustic stack. The concept is extended to show the feasibility of an electronically-scanned, 50 MHz annular array, which would be suitable for catheter based IVUS imaging for the management of vascular disease. Feasibility has been shown through simulation and experiment, demonstrating that satisfactory transducer performance can be achieved when incorporating a combination of unique materials and structures into the integrated transducer.
          The gap junction protein Innexin3 is required for eye disc growth in Drosophila   
Publication date: 15 May 2017
Source:Developmental Biology, Volume 425, Issue 2

Author(s): Mélisande Richard, Reinhard Bauer, Gaia Tavosanis, Michael Hoch

The Drosophila compound eye develops from a bilayered epithelial sac composed of an upper peripodial epithelium layer and a lower disc proper, the latter giving rise to the eye itself. During larval stages, complex signalling events between the layers contribute to the control of cell proliferation and differentiation in the disc. Previous work in our lab established the gap junction protein Innexin2 (Inx2) as crucial for early larval eye disc growth. By analysing the contribution of other Innexins to eye size control, we have identified Innexin3 (Inx3) as an important growth regulator. Depleting inx3 during larval eye development reduces eye size, while elevating inx3 levels increases eye size, thus phenocopying the inx2 loss- and gain-of-function situation. As demonstrated previously for inx2, inx3 regulates disc cell proliferation and interacts genetically with the Dpp pathway, being required for the proper activation of the Dpp pathway transducer Mad at the furrow and the expression of Dpp receptor Punt in the eye disc. At the developmental timepoint corresponding to eye disc growth, Inx3 colocalises with Inx2 in disc proper and peripodial epithelium cell membranes. In addition, we show that Inx3 protein levels critically depend on inx2 throughout eye development and that inx3 modulates Inx2 protein levels in the larval eye disc. Rescue experiments demonstrate that Inx3 and Inx2 cooperate functionally to enable eye disc growth in Drosophila. Finally, we demonstrate that expression of Inx3 and Inx2 is not only needed in the disc proper but also in the peripodial epithelium to regulate growth of the eye disc. Our data provide a functional demonstration that putative Inx2/Inx3 heteromeric channels regulate organ size.






          Pressure and Temperature Transmitters offer 4-20 mA output.   
Integrated with PT1000 measuring element, ATM.1ST/T Pressure and Temperature Transmitters provide up to 15,000psi of pressure range with accuracy of <±0.1% FS or <±0.25% FS. Operated from -58° to 300°F temperature range, units come with piezoresistive silicon sensor technology. Product is suitable for machine installations, industrial process monitoring and control, heating and ventilation applications.

This story is related to the following:
Electrical Equipment & Systems
Optics & Photonics
Sensors Monitors & Transducers
Test & Measuring Instruments

Search for suppliers of: Transmitters | Pressure Transmitters | Temperature Transmitters

          Real-Time, Transcranial Monitoring of Safe Blood-Brain Barrier Opening in Non-Human Primates   
The delivery of drugs to specific neural targets faces two fundamental problems: (1) most drugs do not cross the blood-brain barrier, and (2) those that do, spread to the entire brain. To date, there exists only one non-invasive methodology with the potential to solve these problems: selective blood-brain barrier (BBB) opening using micro-bubble enhanced focused ultrasound. We have recently developed a single-element 500-kHz spherical transducer ultrasound setup for targeted BBB opening in the non-human primate that does not require simultaneous MRI monitoring. So far, however, the targeting accuracy that can be achieved with this system has not been quantified systematically. In this paper, the accuracy of this system was tested by targeting caudate nucleus and putamen of the basal ganglia in two macaque monkeys. The average lateral targeting error of the system was ∼2.5 mm while the axial targeting error, i.e., along the ultrasound path, was ∼1.5 mm. We have also developed a real-time treatment monitoring technique based on cavitation spectral analysis. This technique also allowed for delineation of a safe and reliable acoustic parameter window for BBB opening. In summary, the targeting accuracy of the system was deemed to be suitable to reliably open the BBB in specific sub-structures of the basal ganglia even in the absence of MRI-based verification of opening volume and position. This establishes the method and the system as a potentially highly useful tool for brain drug delivery.
          Using Portable Transducers to Measure Tremor Severity   
Background: Portable motion transducers, suitable for measuring tremor, are now available at a reasonable cost. The use of these transducers requires knowledge of their limitations and data analysis. The purpose of this review is to provide a practical overview and example software for using portable motion transducers in the quantification of tremor. Methods: Medline was searched via PubMed.gov in December 2015 using the Boolean expression “tremor AND (accelerometer OR accelerometry OR gyroscope OR inertial measurement unit OR digitizing tablet OR transducer).” Abstracts of 419 papers dating back to 1964 were reviewed for relevant portable transducers and methods of tremor analysis, and 105 papers written in English were reviewed in detail. Results: Accelerometers, gyroscopes, and digitizing tablets are used most commonly, but few are sold for the purpose of measuring tremor. Consequently, most software for tremor analysis is developed by the user. Wearable transducers are capable of recording tremor continuously, in the absence of a clinician. Tremor amplitude, frequency, and occurrence (percentage of time with tremor) can be computed. Tremor amplitude and occurrence correlate strongly with clinical ratings of tremor severity. Discussion: Transducers provide measurements of tremor amplitude that are objective, precise, and valid, but the precision and accuracy of transducers are mitigated by natural variability in tremor amplitude. This variability is so great that the minimum detectable change in amplitude, exceeding random variability, is comparable for scales and transducers. Research is needed to determine the feasibility of detecting smaller change using averaged data from continuous long-term recordings with wearable transducers.
          Cost effective broadband transducer assembly and method of use   
A transducer assembly for transmitting broadband sonar beams and receiving broadband sonar returned echoes with a low-cost transducer element mounted into a low-cost acoustic structure. By using a transducer element which is sufficiently thin, broadband can be achieved at a significant cost savings over existing methods and devices. Since the transducer element is sufficiently thin, a large portion of the signal energy is coupled transversely into the acoustic structure, resulting in a heavy acoustic load on the transducer element which in turn results in broadband operation. Broadband operation may be enhanced by at least partially enclosing the sufficiently thin transducer element within an aperture and/or a cap.
          Garmin GPSMAP 840xs w/US Coastal LakeV Maps - No Transducer - *Remanufactured   
Garmin GPSMAP 840xs w\/US Coastal  LakeV Maps - No Transducer - *Remanufactured

GPSMAP 840xs w/US Coastal & LakeVü Maps - No Transducer - *Remanufactured

The 8" color Garmin GPSMAP 840xs keyed chartplotter/sonar combo includes US Coastal BlueChart g2 US LakeVü HD maps and built-in 10 Hz GPS/GLONASS. Supports your choice of any c..

Price: $774.99


          Electrical Journeyman - Bergelectric - San Diego, CA   
Feed to, pull into, and terminate wire and cable within control centers, distribution boxes, transformers, transducers, switch gear, receptacles, switches, etc....
From Bergelectric - Thu, 25 May 2017 02:37:59 GMT - View all San Diego, CA jobs
          Journeyman Wireman, Lead Man - Bergelectric - San Diego, CA   
Feed to, pull into, and terminate wire and cable within control centers, distribution boxes, transformers, transducers, switch gear, receptacles, switches, etc....
From Bergelectric - Wed, 17 May 2017 15:18:57 GMT - View all San Diego, CA jobs
          running wires strait uo transome through lip at swim platform   
my sea ray sundancer 250 has a molded hollow lip that will bring wires into engine area at swim platform, im thinking of drilling a big hole for transducer cable and some led lights. light were drilled below water line by previous owner and leaked.
          MCQs On Antennas – GATE Problems Uploaded   

An antenna is a transducer that converts radio frequency electrical signal into electromagnetic wave of the same frequency. The current produces an electrostatic field, thus creating an induction field. Antenna arrays are used to increase the gain of the antenna..

The post MCQs On Antennas – GATE Problems Uploaded appeared first on Free GATE ECE 2017 Coaching With Videos & Multiple Choice Questions.


          Electrical Journeyman - Bergelectric - San Diego, CA   
Feed to, pull into, and terminate wire and cable within control centers, distribution boxes, transformers, transducers, switch gear, receptacles, switches, etc....
From Bergelectric - Thu, 25 May 2017 02:37:59 GMT - View all San Diego, CA jobs
          Journeyman Wireman, Lead Man - Bergelectric - San Diego, CA   
Feed to, pull into, and terminate wire and cable within control centers, distribution boxes, transformers, transducers, switch gear, receptacles, switches, etc....
From Bergelectric - Wed, 17 May 2017 15:18:57 GMT - View all San Diego, CA jobs
          Raymarine E80,VHF, kenwood in Contender display box   
For sale Contender electronics box off 23T console with Raymarine E80 - navionics gold card Raymarine VHF Raymarine DSM30 box Transducer ...
          HDS-7 Gen3 Insight with Low/High Transducer   

Details:Multi-touch 7 WidescreenFull Control via touchscreen or keypadBuilt-in CHIRP/Broadband SounderBuilt-in StructureScan (with StructureScan transducer)Simultaneous CHIRP and StructureScan capabilitiesBuilt-in 10Hz GPS/GLONASS antennaBuilt-in W...[Read More]
Our Price: $1,349.00 [Add to Cart]



          HDS-9 Gen3 INSIGHT with Medium/High/TOTALSCAN Transducer   

Details:Multi-touch 9 WidescreenFull Control via touchscreen or keypadBuilt-in CHIRP/Broadband SounderBuilt-in StructureScan (with StructureScan transducer)Simultaneous CHIRP and StructureScan capabilitiesBuilt-in 10Hz GPS/GLONASS antennaBuilt-in W...[Read More]
Our Price: $2,299.00 [Add to Cart]



          HDS-12 GEN3 INSIGHT with Medium/High/TOTALSCAN Transducer   

Details:Multi-touch 12 WidescreenFull Control via touchscreen or keypadBuilt-in CHIRP/Broadband SounderBuilt-in StructureScan (with StructureScan transducer)Simultaneous CHIRP and StructureScan capabilitiesBuilt-in 10Hz GPS/GLONASS antennaBuilt-in...[Read More]
Our Price: $3,399.00 [Add to Cart]



          Nelson Sepúlveda   

May 16, 2017

How engineers turned a flag into a loudspeaker 

A paper-thin, flexible device created at Michigan State University not only can generate energy from human motion, it can act as a loudspeaker and microphone as well, nanotechnology researchers reported May 16 in Nature Communications.

The audio breakthrough could eventually lead to such consumer products as a foldable loudspeaker, a voice-activated security patch for computers and even a talking newspaper.A research breakthrough by Nelson Sepúlveda, associate professor of electrical and computer engineering, could eventually lead to consumer products such as a foldable loudspeaker, a voice-activated security patch for computers, and talking newspaper. Photo by G.L. Kohuth, MSUToday.

“Every technology starts with a breakthrough and this is a breakthrough for this particular technology,” said Nelson Sepúlveda, associate professor of electrical and computer engineering and primary investigator of the federally funded project.

“This is the first transducer that is ultrathin, flexible, scalable and bidirectional, meaning it can convert mechanical energy to electrical energy and electrical energy to mechanical energy.” 

Video: How engineers turned a flag into a loudspeaker

In late 2016, Sepúlveda and his team successfully demonstrated their sheet-like device – known as a ferroelectret nanogenerator, or FENG – by using it to power a keyboard, LED lights and an LCD touch-screen. That process worked with a finger swipe or a light pressing motion to activate the devices – converting mechanical energy to electrical energy.

The current breakthrough extends the FENG’s usability. The researchers discovered the high-tech material can act as a microphone (by capturing the vibrations from sound, or mechanical energy, and converting it to electrical energy) as well as a loudspeaker (by operating the opposite way: converting electrical energy to mechanical energy).

To demonstrate the microphone effect, the researchers developed a FENG security patch that uses voice recognition to access a computer. The patch was successful in protecting an individual’s computer from outside users. “The device is so sensitive to the vibrations that it catches the frequency components of your voice,” Sepúlveda said.

To demonstrate the loudspeaker effect, the FENG fabric was embedded into an MSU Spartan flag. Music was piped from an iPad through an amplifier and into the flag, which then reproduced the sound flawlessly. “The flag itself became the loudspeaker,” Sepúlveda said. “So we could use it in the future by taking traditional speakers, which are big, bulky and use a lot of power, and replacing them with this very flexible, thin, small device.”

Imagine a day when someone could pull a lightweight loudspeaker out of their pocket, slap it against the wall and transmit their speech to a roomful of people, Sepúlveda said. “Or imagine a newspaper,” he added, “where the sheets are microphones and loudspeakers. You could essentially have a voice-activated newspaper that talks back to you."

Wei Li, an MSU engineering researcher and lead author of the paper in Nature Communications, said other potential applications of the FENG include noise-cancelling sheeting and a health-monitoring wristband that is voice-protected.

Engineering researchers Wei Li and Nelson Sepúlveda are working toward applications that include noise-cancelling sheeting and a health-monitoring wristband that is voice-protected. Photo by G.L. Kohuth, MSUToday.“Many people are focusing on the sight and touch aspects of flexible electronics,” Li said, “but we’re also focusing on the speaking and listening aspects of the technology.”

The innovative process of creating the FENG starts with a silicone wafer, which is then fabricated with several layers, or thin sheets, of environmentally friendly substances including silver, polyimide, and polypropylene ferroelectret. Ions are added so that each layer in the device contains charged particles. Electrical energy is created when the device is compressed by human motion, or mechanical energy.

The research is funded by the National Science Foundation. Other co-authors are David Torres, Ramon Diaz, and Chuan Wang from MSU, and Zhengjun Wang, Changsheng Wu, and Zhong Lin Wang from the Georgia Institute of Technology.Like a traditional loudspeaker, this sheet-like, flexible device can transmit sound. Created by MSU engineers, the device - known as a ferroelectret nanogenerator, or FENG - can be embedded into a flag or other fabric. It could one day lead to a foldable loudspeaker or an audio newspaper. Photo by G.L. Kohuth, MSUToday.