Shot-noise limited sensing and control using radio-frequency amplitude modulation

2008 ◽  
Author(s):  
Jong H. Chow ◽  
Ian C. M. Littler ◽  
David E. McClelland ◽  
Malcolm B. Gray
Keyword(s):  
Radio Frequency ◽  
Shot Noise ◽  
Amplitude Modulation ◽  
Limited Sensing ◽  
And Control

Analysis on the effect of polyetherimide on energy distribution of radio frequency heating of viscous sauce

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Huojie Shi ◽  
Hui Chen ◽  
Zhiming Yan
Keyword(s):  
Energy Distribution ◽  
Radio Frequency ◽  
Peanut Butter ◽  
Effective Means ◽  
Commercial Application ◽  
Rf Heating ◽  
Heating Uniformity ◽  
Uneven Heating ◽  
And Control ◽  
Shape And Size

Abstract Radio frequency (RF) sterilization of low-moisture, high-oil, high-protein, and viscous sauces for instant food (LHHVS) demonstrates many advantages, but uneven heating is a main problem that must be addressed. Main factors that affect heating uniformity are generally considered dielectric properties, shape and size of the sample and its position relative to the electrode plate, in addition the structure and voltage of RF electrode. A method based on texture characteristics of the solid–gel–liquid mixing system of LHHVS for adjustment and control of energy distribution in the RF field is proposed in this study to improve the heating uniformity. First, energy conversion principles and control equations of RF heating were analyzed on the basis of dielectric theory. Second, the influence of RF electromagnetic field-medium polyetherimide (PEI) on the RF heating of peanut butter (RHPB) was investigated on the basis of the numerical model of RHPB that was verified through experiments. Finally, the influence mechanism and its regulation and control effect were analyzed and discussed. The following conclusions can be drawn from this study: the increase of electrode gaps exerts minimal effect although it reduces the unevenness of the energy distribution. However, RF heating protocols must use the smallest possible electrode gap to heat agrifoods and increase the heating rate significantly. The energy distribution on the part of the sample close to PEI varies with the change of geometry and size of PEI when its placement is bias or symmetric. The area of energy enhancement continues to expand where the sample is in contact with PEI as PEI gradually increases. The area where the temperature increases under the influence of PEI will expand along the direction of the sample radius when the thickness of PEI remains unchanged and the radius gradually enlarges; otherwise, it will expand along the direction of the sample thickness. The influence of PEI on the energy distribution of RHPB demonstrates local characteristics. PEI significantly influences the energy distribution and heating mode of RHPB, which is easy to adjust and control, but does not reduce the processing speed and does not increases energy consumption. Hence, PEI is an effective means to interfere with energy distribution of RHPB. Uniform energy distribution can be obtained by selecting the appropriate PEI shape and size. Results of this study can help determine the experimental protocol for RHPB with the optimal uniform distribution and promote the fast commercial application of this technology.

scholarly journals UWB fastly-tunable 0.5-50 GHz RF transmitter based on integrated photonics

2021 ◽  
Author(s):  
Fabio Falconi ◽  
Claudio Porzi ◽  
Filippo Scotti ◽  
Giovanni Serafino ◽  
Antonio Malacarne ◽  
...  
Keyword(s):  
Power Consumption ◽  
Radio Frequency ◽  
High Precision ◽  
Life Style ◽  
State Of The Art ◽  
Ultra Wideband ◽  
Robot Localization ◽  
Rf Transmitter ◽  
And Control ◽  
Large Tunability

Abstract In the last decade, the interest in software-defined ultra-wideband (UWB) and tunable radio frequency (RF) apparatuses with low size, weight, and power consumption (SWaP), has grown dramatically, pushed by the new 6G vision where, RF equipment shall enable a large number of fundamental applications as UWB communications, robot localization mapping and control and high precision radars, all of them contributing in revolutionizing our life style. Unfortunately, the coexistence of ultra-wideband and software-defined operation, tunability and low SWaP represents a big issue in the current RF technologies. In this article, to the best of our knowledge, the first example of a complete tunable software-defined RF transmitter with low footprint (i.e. on photonic chip) is presented exceeding the state-of-the-art for the extremely large tunability range of 0.5-50 GHz without any parallelization of narrower-band components and with fast tuning (<200micros). This first implementation, represents a breakthrough in microwave photonics.

scholarly journals Multicriterial Evaluation of the Transport and Logistic System of the Moscow Region

2021 ◽  
Vol 334 ◽  
pp. 02029
Author(s):  
Vasily Demin ◽  
Alexey Terentyev
Keyword(s):  
Radio Frequency ◽  
Control Method ◽  
Complex Structure ◽  
Moscow Region ◽  
Logistics System ◽  
System Parameters ◽  
Complex Problems ◽  
Control Technologies ◽  
And Control

The article deals with the direction of solving complex problems of interaction between the elements of the transport and logistics system of the Moscow region as a complex structure of management methods in multi-criteria systems and technologies for monitoring the quality of processes. The control method should optimize the system parameters, and control technologies (radio frequency cargo identification) implement feedback in the system.

58 RADIO-FREQUENCY IDENTIFICATION INTELI-STRAWS: GAMETES AND EMBRYO PACKAGING, STORAGE, AND INFORMATION RECOVERY

2017 ◽  
Vol 29 (1) ◽  
pp. 136
Author(s):  
M. E. Kjelland ◽  
T. Loper ◽  
C. Woodley ◽  
T. M. Swannack ◽  
T. K. Stroud ◽  
...  
Keyword(s):  
Radio Frequency ◽  
Liquid Nitrogen ◽  
Radio Frequency Identification ◽  
Exact Test ◽  
Information Recovery ◽  
Cold Tolerant ◽  
Frequency Identification ◽  
The Mean ◽  
Extreme Cold ◽  
And Control

The assisted reproduction industry involving sales and services for gametes and embryos for domestic animals of commercial value is a large market totaling millions of dollars annually. The objective of this study was to develop and test gamete and embryo packaging—Inteli-Straws (I-S) equipped with radio-frequency identification (RFID) technology. Specifically, French straws (0.25 and 0.5 mL) were modified to include extreme cold-tolerant RFID microchips. Two groups of I-S were formed: Group (G)1: RFID chips that were autoclaved (n = 49), and G2: RFID chips that were not autoclaved (n = 47). Both groups had a control that was not exposed to liquid nitrogen (LN). Each group was exposed to LN up to 4 times: 2 slow freezes first and then 2 fast (i.e. vitrification) freezes, and I-S RFID chip survival was determined. I-S detection and readability (non-autoclaved) was also measured, placing I-S just above LN (in vapors, n = 43) or just below LN (n = 38). Statistical differences (α = 0.05) were determined using Fisher’s exact test. The results between G1 and G2 were not significantly different (P = 0.108) after 4 rounds of cryopreservation (and thawing). For G1, 98% (48/49) of the I-S RFID chips remained operational, and control and treatment were not significantly different (P = 1.000). For G2, 89.4% (42/47) of the autoclaved RFID chips remained operational, and control and treatment not significantly different (P = 0.099). RFID chip readability results; that is, the ability to detect the I-S versus not able to detect the I-S, comparing placement just above liquid nitrogen (LN) versus the placement just below LN were not significantly different (P = 0.105). Notably, detection differences varied within each group, with I-S in G1 (mean = 9.5; SD = 3.5 cm) readable at a larger distance, 5.2 cm farther than the mean of G2 (mean = 4.3; SD = 1.9 cm). During AI or embryo transfer (ET), a technician may not clearly identify the label or colour of straw, may incorrectly record the information, or may take more time than desirable to record it. Increased exposure times may lead to decreased viability of gametes and embryos. The results show that by using the I-S, one may quickly scan the straw within LN or LN vapors, thereby automatically detecting information and even uploading it to a database (e.g. scanner sophistication). We are not aware of comparable device to I-S for locating and retrieving associated information without removing the gamete/embryo packaging from LN or LN vapors; unlike traditionally labelled straws (e.g. laser etched or ink labels). Also, for AI and ET, the I-S can be quickly scanned and the straw information automatically detected and uploaded to a database.

Study on Facilities Agriculture Remote Monitor and Control System Based on Tri-Networks Convergence

2014 ◽  
Vol 1073-1076 ◽  
pp. 1875-1878
Author(s):  
Li Juan Shi ◽  
Xiu Xia Yu ◽  
Jian Zhao ◽  
Qin Sheng Du
Keyword(s):  
Radio Frequency ◽  
Real Time ◽  
Internet Technology ◽  
The Internet ◽  
Monitoring And Control ◽  
Remote Transmission ◽  
Control Information ◽  
3G Network ◽  
Remote Controller ◽  
And Control

Facility agriculture environment monitoring system of the existing main adopts the wired communication technology, such as serial bus technology and field bus technology for communication. This system has the advantages of good interoperability, strong anti-interference ability, but the poor stability, low reliability, difficult to deploy, installation and maintenance costs high, which greatly limits its application in the design of facilities agriculture field. Three nets fusion refers to the 3G, RFID and Internet combination. In this paper, the 3G network, wireless radio frequency technology and Internet technology combining, in order to solve the above problems, the use of 3G network and the Internet to a large amount of data real-time remote transmission, using radio frequency network RFID technology through the short distance wireless data transmission terminal sensors to collect information, these information in time through the3G network and the Internet are transmitted to the the remote controller. The remote controller sends according to terminal sensor control information, through the 3G network and the Internet will control information is transmitted to the radio frequency network, wireless RF network through wireless communication control information is transmitted to the terminal controller, the final completion of the remote monitoring and control of agricultural facilities. The experimental results show that, the system can meet the real-time and can perform remote transmission for large data, provide the technical basis of visual audio data monitoring information transmission for agricultural facilities.

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