000715   Jambulingam M;Karthikeyan S;Sivakumar P; Kiruthika J;Maiyalagan T (PG & Research Department of Chemistry, PSG CAS, Coimbatore, Email: jambupsggas@rediffmail.com) : Characteristic studies of some activated carbons from agricultural wastes. J scient ind Res 2007, 66(6), 495-500.

Agricultural wastes like tobacco stem, bulrush Scirpus acutits stem, Leucaena leucocephala shell, Ceibapentandra shell, Pongamia pinnata shell have been explored for the preparation of activated carbon. Characterization studies such as bulk density, moisture, ash, fixed carbon, matter soluble in water, matter soluble in acid, pH, decolourising power, phenol number, ion exchange capacity, iron content and surface area have been carried out to assess the suitability of these carbons as absorbents in water and wastewater. Adsorbents both organics and inorganics. The recovery of valuable adsorbents from readily and cheaply available agriculture wastes.

1 illus, 5 tables, 23 ref

000714   Jagadeesh Balaji R;Senthil Kumar K;Shanmugam J (Avionics Div, Electronics Engineering Dep, Chennai-600 044, Email: jagadeesh_balaji@yahoo.com) : Development and tuning of a nonlinear six DOF model and controllers for a large UAV. J Aerospace Sci Technol 2007, 59(3), 185-95.

Presents development of non-linear six-degree-of-freedom model for a large UAV and simulation of its dynamics during its landing phase. A non-linear six-degree-of-freedom aircraft model was developed using the block available in the Aerosim Aeronautical Simulation Blockset in MATLAB / SIMULINK environment. The aircraft parameter data for a large UA V was taken. The developed model could be used for simulating the dynamics of the UA V with single piston engine and fixed pitch propeller. The following controllers were tuned using the above model to simulate its landing phase. Bank to Aileron', 'Airspeed error to Pitch command', 'Pitch error to Elevator deflection', 'Engine rpm error to Throttle'. The first approach was by conventional techniques using PI and PID controllers. In the next stage fuzzy logic controllers were designed for the above cases. All fuzzy controllers were designed using Mamdani inference system.

11 illus, 6 ref

000713   Gunasekaran M;Robinson R G (Civil Engineering Dep, Indian Institute of Technology Madras, Chennai-600 036, Email: gunasekaran.iitm@gmail.com) : On-sample measurement of strains in triaxial samples using strain gauges. Indian Geotech J 2008, 38(1), 33-48.

A new technique is proposed to measure the strains in triaxial samples using strain gauges. The stress-strain curves obtained by vacuum confinement technique are practically the same as those obtained by conventional cell pressure application for both sand and clay under different drainage conditions. As the sample under vacuum confinement is free to access, any sort of on-sample instrumentation can be made. Strain gauges were mounted on the sample for measuring the axial strains. Comparison with the on-sample strain measurement using the sophisticated state-of-the-art on-sample LVDT proves the validity of the proposed technique. The limitation of the proposed method is that an effective confining stress of only 100 kPa can be achieved by the vacuum confinement. Therefore, the method is suitable for practical situations where the effective overburden pressure in the ground is less than 100 kPa.

10 illus, 2 tables, 20 ref

000712   Gowd K P;Sahu J (Head Quarter SWAC, Indian Air Force, Sector-09, Gandhinagar-382 009) : Aerodynamic body shaping method for a stealth fighter aircraft. J Aerospace Sci Technol 2007, 59(3), 208-11.

3 illus, 1 table, 4 ref

000711   Govindasamy P;Dhandapani S (NO, Kongu Engineering College, Erode-638 052, Email: pgsamy@gmail.com) : Performance and emissions achievements by magnetic energizer with a single cylinder two stroke catalytic coated spark ignition engine. J scient ind Res 2007, 66(6), 457-63.

The work conducted on a zirconia (catalyst) activated two-stroke spark ignited engine to investigate the effect of high gauss magnetic energy on cyclic variation of combustion parameters. A 9000 gauss magnet, made up of Neodymium-Iron-Boron, is fixed on fuel line before carburetor. The coating is carried out by thermal evaporation technique on the inside surface of combustion chamber walls and piston crown. In-cylinder pressures were recorded for 500 continuous cycles using a piezo electric pressure pickup and PC based data acquisition system. Magnetic flux activates preflame reaction and shortens combustion duration. Cyclic variation of combustion parameters due to magnetic energy were 25.1% less than the base engine and mean value of the peak pressures were found to have upper shift of 13.6%. Magnetically energized zirconia coated engine performed better than the base engine during running.

12 illus, 2 tables, 42 ref

000710   Gopal Madabhushi S P;Chandrasekaran V S (Civil Engineering Dep, Indian Institute of Technology, Bombay, Email: mspg1@eng.cam.ac.uk) : Centrifuge testing of a sheet pile wall with clay backfill. Indian Geotech J 2008, 38(1), 1-20.

17 illus, 2 tables, 18 ref

000709   Gole S V;Gupta M;Agrawal K N (Industrial Engineering Dep, Ramdeobaba K. N. Engineering College, Nagpur, Email: svgole_ngp@sancharnet.in) : System for power plant performance evaluation. Indian J Pwr River Valley Dev 2007, 57(5-6), 142-7.

Presents an approach to develop a system to evaluate the performance of a power plant. In this energy conscious era, power generation, distribution and consumption need to be given serious attention so as to determine the opportunities of power saving or trouble shooting areas where energy is lost. However, to achieve this, a user-friendly system to evaluate power plant performance is necessary. Power plant performance evaluation is a tedious job since it involves steam table, psychrometric chart and various other charts provided by manufacturers of power plant components. An exhaustive system exists for measuring performance of boiler, turbine, hp-heaters, air-heater, economizer, condenser, cooling-tower, coal-mill and electrostatic precipitator (ESP) is developed. However presents a system for performance evaluation of boiler and turbine generator systems of power plant.

6 illus, 8 ref

000708   Gokdag M;Hasiloglu A S;Karsli N;Atalay A; Akbas A (Civil Engineering Dep, Ataturk Univ 25240-Erzurum, Turkey, Email: asamet@atauni.edu.tr) : Modeling of vehicle delays at signalized intersection with an adaptive neuro-fuzzy (ANFIS). J scient ind Res 2007, 66(9), 736-40.

An adaptive neuro-fuzzy inference based delay estimation system is proposed. The system is compared with other delay estimation models, and tested through simulation and observation values. Rules, fuzzification and inference are modeled by neuro-fuzzy. Hybrid algorithm has been used for training and tests. The rule base of the delay estimation system is constructed either following a mathematical model or from real-time traffic operational data. As shown that adaptive neuro-fuzzy technique, a method to predict vehicle delays at signalized junctions, can be successfully applied to modeling of traffic systems.

3 illus, 1 table, 22 ref

000707   Fertelli A;Buyruk E (Mechanical Engineering Dep, Cumhuriyet Univ, 58140, Sivas, Turkey, Email: buyruk@cumhuriyet.edu.tr) : Numerical analysis of heat transfer characteristics for deposit formation shapes around single cylinder. J scient ind Res 2007, 66(7), 528-35.

Fouling effect on heat transfer around a cylinder in cross-flow was investigated numerically by ANSYS software programme using finite element method, Calculations were made with variable local heat transfer coefficients, consiant free-stream temperature and constant clean tube surface temperature. Heat transfer rates were presented for different cases with temperature field. Deposit thickness formed around the cylinder was fixed as follows: i) Non-uniform thickness of fouling shape was calculated with homogenous condition: ii) Non-uniform and non-homogenous fouling shape was considered: and iii) Effect of eccentricity was calculated for non-uniform and non-homogeneous cases. Numerical predictions were made as temperature contours through thickness of fouling and Q_foul/ Q_clean was plotted against the position of fouling.

8 illus, 13 ref

000706   Erdem B;Duran Z (Mining Engineering Dep, Cumhuriyet Univ, 58140, Sivas Turkey, Email: bulent@cumhuriyet.edu.tr) : A model for extended bench casting in dipping coal seam. J scient ind Res 2007, 66(6), 435-43.

Deals with extended bench casting with draglines in surface coalmines. A computer model, developed for Trane) design, covers three fundamental operating modes: i) level casting for flat-lying coal seam; ii) downhill casting; and iii) uphill casting for inclined coal seam conditions. Influence of pit width on critical pit dimensions such as cut length, dragline reach on key cut and main cut positions, swing angles on key cut and main cut positions and rehandle percentage is critically studied. The model is equipped with a device to determine total number of points within a cut on which dragline is placed. With another module, walking pattern of dragline between adjacent cuts is decided. The model indicates that coal seam inclination significantly influences dragline productivity. All things being equal, the uphill operation mode demands larger dragline dimensions. Extended bench construction in uphill casting is easier and faster as less material is required. Besides, dragline operates on a safe bench. As coal seam gets inclined, a large dragline may switch from extended benching in downhill mode to direct casting owing to the room available for spoil piles increases with coal seam inclination. However, a small dragline would likely fail to operate in downhill mode as the size of the extended bench would expand faster than the waste available in the cut. Besides, dragline would not be adversely affected by failures occurring in spoil piles. It has been observed that in extended benching practice with an inclined coal seam downhill casting should beconsidered first.

8 illus, 3 tables, 8 ref

000705   Dutt D;Garg A P;Tyagi C H;Upadhyay A K (NO, IIT Roorkee, Saharanpur-247 001, Email: dharm_dutt@yahoomail.com) : Bio-delignification of lignocarbohydrates residues of Cymbopogon martini with Phanerochaete chrysosporium. J scient ind Res 2007, 66(6), 483-9.

Cymbopogon martini, palma rosa grass, is cultivated for important palma'rosa oil. Lignocarbohydrates residue (LCR) of C. martini left after steam distillation could successfully be used for the production of chemical grade pulp. C martini had low lignin and more open and looser structure, which makes il suitable for biopulping. Openness of pile, heterogeneity of tissues and vast exposed surface area favor growth and colonization of LCR of C. martini by a multitude of microorganisms. Phancmcliaete chrvsospiiriiini was grown in solid-slate culture on LCR of C. martini. The growth of fungus on wheat bran as source of hemicellulose shows good enzyme activity. Wheat bran, a cheaper substrate, shows its commercial viability. LCR had 13.6% lignin. 74.4% holocellulose and a pemosan fraction of 25.4%. After 28 days at 40 °C, P. chrysosporiwn produced a residue from LCR of C. martini with a higher in vitro dry matter digestibility. P. chrvsoxporhini degraded 30.11 % of lignin, 62.25% of pentosan and 18.60% of holocellulose of the original value of LCR of C martini.

4 illus, 4 tables, 31 ref

000704   Datta T;Managaraj B B;Saha Mishra Iti (Electronics and Telecommunication Engineering, Jadavpur Univ, Kolkata-700 032) : A new optimization technique in the application of antenna problem:bacteria foraging algorithm. Int J Inf Comput Sci 2007, (20 Nov), 44-8.

Proposes an approach involving Bacterial Foraging (BF) to optimize the location of thin dipole antennas in the three-dimensional space for maximum radiation at any desired direction specified by angles with the azimuthal and vertical planes. This method is very much useful for any type of antenna problem to be optimized.

2 illus, 7 ref

000703   Datta T;Ghosh A;Das S;Nandy A;Mishra A N; Sarkar S K (NO, Institute of Engineering and Management, Saltlake, West Bengal, Email: sksarkar@etce.jdvu.ac.in) : Realization of a RFID system and to study the channel effects on its performance. Int J Inf Comput Sci 2007, (20 Nov), 49-55.

Radio Frequency Identification and Detection is a flexible wireless communication technology that is convenient and well suited for automatic operation. This technology of object identification provides some distinct advantages not avail with other identification scheme. RFID can work under variety of environment conditions and ensures data integrity. The environment basically incorporate noises, multipath fading etc. chaos can exhibit almost real environment. Hence, to create almost real environment using Chaos and will study their effects on RFID system performance.

8 illus, 7 ref

000702   Datta T (Electronics and Telecommunication Engineering, Jadavpur Univ, Jadavpur, Email: data_tanumay@rediffmail.com ) : Radio frequency identification: a tutorial. Int J Inf Comput Sci 2007, (20 Nov), 63-70.

Covers different aspects of Radio Frequency Identification (RFID). The technology along with its application and current problems are discussed here in tutorial basis.

4 illus, 16 ref

000701   Datta S K;Sidharthan P;Raja Ramana Rao P; Reddy S U M (Microwave Tube Research & Development Centre, DRDO, , Bangalore-560 013, Email: drskdatta@gmail.com) : A simple analysis of backward-wave oscillation criterion for helix travelling-wave tubes. Asian J Phys 2008, 17(2), 307-12.

A closed-form expression for backward-wave oscillation criterion in a helix travelling-wave tube was developed by a way of curve-fitting to standard published results of Johnson, which allows one to dispense with a lengthy and cumbersome iterative analysis otherwise in vogue. The analysis allows one to directly use the phase-velocity and interaction impedance values obtainable from eigen-mode analysis of the helical slow-wave structures through three-dimensional modeling in HFSS, MAFIA or CST Microwave Studio. Eigen-mode analysis is the state-of-the-art methodology for computation of dispersion and interaction impedance characteristics that are used as input for design simulation. However, the eigen-mode analysis provides field solutions only for the forward-fundamental space-harmonic mode of propagation, and not able to provide one with the backward-wave space-harmonic field-solutions that are required to analyze the limiting parameters for stabilizing the device against backward-wave oscillation. Propose a simple analytical approach to compute the backward-wave interaction impedance from the forward-fundamental space-harmonic solutions obtainable from the eigen-mode analysis.

5 illus, 10 ref

000700   Dalela C;Dalela P K;Chandra D (JSSATE, , Sector-62, Noida-201 301, Email: chhaya1974@rediffmail.com) : OFDM based QOS and capacity enhancement for mobile networks. Asian J Phys 2008, 17(2), 285-8.

The legacy cellular communication networks are not designed to support today's growth of mobile subscribers along with increase in variety of services. A new approach has been suggested to overcome bottleneck of traditional slow and limited bandwidth links of networks by providing faster and bandwidth efficient Orthogonal Frequency Division Multiplexing (OFDM) based fixed wireless communication links, which is seamless to end mobile users. This approach will increase capacity and Quality of Service (QOS) of existing mobile networks. Implication of effective Radio Resource Management (RRM) with new hand off algorithm is presented here. The target is achieved with channel characterization with the help of continuous channel equalization. The simulation results of this approach has been shown using MATLAB 6.5.

7 illus, 8 ref

000699   Daghbandan A;Najar R;Haghi A K (NO, Guilan Univ, P O Box 3756, Rasht, Iran, Email: ghaghi@guilan.ac.ir) : New computational method for microwave drying of potato slabs. J scient ind Res 2007, 66(12), 1041-6.

Experiments and generalized mathematical models have been used to evaluate impact of heat and mass transfer mode on microwave drying of potato. Evolution of temperature, moisture content as well as overall drying kinetics have been discussed with various internal and external physical parameters. New computational method can be used as a tool for microwave drying of potato slabs more efficiently.

3 illus, 4 tables, 22 ref

000698   Colak I;Kosalay I;Inan A (Electrical Education Dep, Faculty of technical Education, Gazi Univ, 06500 Besevler, Ankara, Turkey, Email: icolak@gazi.edu.tr) : Estimation of magnetic field distributions in substation centers using artifical neural networks. J scient ind Res 2007, 66(10), 819-27.

Magnetic fields at different operation conditions, in and out of the measurement points, were estimated and visualized bythe developed visual software, which has 3D screening unit, based on artificial neural networks and grid data. Software enables users to estimate electromagnetic field distributions in and out of the measurement points.

7 illus, 1 table, 51 ref

000697   Chatterjee D (Commerce Dep, Netaji Nagar Day College, Netaji Nagar) : Importance of RFID in inventory management. Int J Inf Comput Sci 2007, (20 Nov), 56-62.

Provides a general introduction to Radio Frequency Identification (RFID) technology and discusses is made on the some application of RFID in inventory management and cost control.

2 ref 

000696   Chakraborty S (NO, RFID Centre of Excellence, TCS, Email: sukumar.chakraborty@tcs.com) : Active RFID-technology and applications. Int J Inf Comput Sci 2007, (20 Nov), 17-25.

RFID (Radio Frequency Identification) is not a new name in the industry, any more. RFID in its very basic from can be broadly classified into two categories, Passive RFID and Active RFID. While the passive tags extract its required energy from the signal transmitted from the reader, the active tags have their own power source for operation. This basic difference gives rise to some fundamental differences in technical as well as behavioural properties. Although active tags are costlier and also they are heavier, still there are problems which can be solved with active RFID, only. So active RFID, only. So active RFID is becoming more and popular, and the global spending towards active RFID is also showing a healthy gradient upwards. Talks about the major differences between passive and active RFID systems, and presents a survey of applications where active RFID is being used or can be used, successfully.

5 illus, 2 tables

000695   Brunner W G (Bauer Machinen GmbH, , Germany) : First cut-off wall in the Indian Himalayas for the dam of Dhauliganga hydroelectric project. Indian J Pwr River Valley Dev 2007, 57(7-8), 171-5.

In the far north of Uttaranchal in the Indian Himalayas, the 280 MW Dhauliganga hydroelectric power plant is under construction by National Hydroelectric Power Corporation (NHPC). This project sets out to develop the lower section of the mountain cascade of the Dhauliganga river, a tributary of the Sarda river, with a 311 m gross head. The 1360 km^{2 mountainous catchment area is bounded in the north-east by the Chinese border and in the south-east by the Nepalese border. The dam project is located in a remote area north of the principal town of Darchula of the upper Sarda valley, which is one of the seismically most active regions of India. The 56 m high rockfill dam is the first of its kind in India, is faced with concrete and has a 1 m thick, at its crown 270 m long and over 70 m deep cut-off wall of plastic concrete below its toe. The cut-off wall, with a total area of 7500 m2, is constructed by a combination of Bauer hydraulic grabs, assisted by chisels and a Bauer BC40 cutter which enables the overlapping joint system, guarantees optimum vertically and enables the cut-off to be keyed into the bedrock formation.}

11 illus

000694   Brahma P K (NO, C.E.O. Valency Compounds Services Pvt.Ltd, ) : Welding of tools & dies. Indian Weld J 2007, 40(2), 32-6.

6 illus, 3 tables

000693   Bose A (NO, MCKV Institute of Engineering, , Email: avi_bose@yahoo.com) : RFID technology in intranet security. Int J Inf Comput Sci 2007, (20 Nov), 31-4.

Intranet security is now a days playing a key role in the total networking scenario. What basically is of important in the Intranet security is the Intrusion Detection system. Now how to actually use RFID Technology in Intrusion Detection is of prima-facie concern in this paper. Work has been carried out till date about RFID network security but postulate a model which will use RFID Technology in Intrusion Detection.

5 illus, 4 ref

000692   Banerjee P;Dutta D (ECE Dep, Techon India, Salt Lake, Kolkata, Email: rabir.banerjee@gmail.com) : RFID range and the type of diode in TAG detector circuit-in search of a relationship. Int J Inf Comput Sci 2007, (20 Nov), 35-43.

Engineering inductive ID systems calls for an ability to calculate reading ranges for various combinations of readers, reader antennas, and tags. Also the risk of interference from external radio signals or from other readers in a system needs to be assessed. Such calculations can also be used for comparison of the system properties for different values of system parameters. Find the weaknesses of ID systems and suggests some methods to improve RFID ranee.

1 illus, 4 ref

000691   Balusamy T;Marappan R (Mechanical Engineering Dep, Government College of Engineering, Salem-636 011, Email: balusamyt@rediffmail.com) : Performance evalution of direct injection diesel engine with blends of Thevetia peruviana seed oil and diesel. J scient ind Res 2007, 66(12), 1035-40.

Methyl easter of Thevetia seed oil (TPSO), blended with diesel, has been tried in naturally aspirated single cylinder diesel engine at rated speed of 500 rpm. The performance and emission parameters like, brake thermal efficiency, brake specific fuel consumption, CO, HC, NO_x, CO₂, O₂, smoke and exhaust gas temperatures are measured, analyzed and compared with that of diesel. Engine performance with TPSO has been found comparable to that of diesel and CO, HC emissions are less but NO_x and smoke are slightly higher than that of diesel.

3 illus, 1 table, 16 ref

000690   Bal S (NO, , B 17, NIT Campus, Rourkela-769 008, Email: smrutisikha_bal@yahoo.com) : Influence of dispersion states of carbon nanotubes on mechanical and electrical properties of epoxy nanocomposites. J scient ind Res 2007, 66(9), 752-6.

Multiwalled carbon nanotubes (MWCNTs)/ epoxy resin composites have been fabricate content (0.2%) of MWCNTs in the cpoxy matrix using ethanol. To analyze dispersion of CNTs opt ical microscope is used. Further ductile nanocomposites (NCs) are prepared by setting samples at low temperature. With a little wt% of CNTs, composite samples yield higher mechanical and electrical properties than pure resin samples. Improvement in flexurel modulus and electrical conductivity are observed in NCs containing well dispersed CNTs than the ones with poorly d.spersed CNTs, Lower values are due to inhomogeneous dispersion of nanotubes in polymer matrix. Moreover, ductile samples having better dispersion state exhibit significant improvement in mechanical and electrical properties.

5 illus, 18 ref

000689   Azadeh A;Ghaderi F;Anvari M;Izadbaksh H; Dehghan S (Industrial Engineering Dep, Research Institute of Energy Management and Planning, Faculty of Engin, PO Box 11365-4563, Tehran Univ, Iran, Email: aazadeh@ut.ac.ir) : Performance assessment and optimization of thermal power plants by DEA BCC and multivariate analysis. J scient ind Res 2007, 66(10), 860-72.

Integrated Data Envelopemenl Analysis (DEA) methodology using Banker Charnes Cooper (BCC) input oriented model tor assessment and optimization of conventional thermal power plants (gas, steam and combined cycles). Installed capacity, fuel consumption, labor cost, internal power, forced outage hours and operating hours are used as input parameters whereas total power generation is used as output parameter. Moreover, 40 power plants in Iran were used as decision-making units and DEA-BCC model was used to assess their efficiency and rank during 1997-2000. Principal Component Analysis (PCA) and Numerical Taxonomy (NT) together with Spearman correlation technique were used to verify and validate the findings of DEA-BCC approach. In addition, all regional power plants have been ranked, assessed and optimized in comparison with all thermal power plants.

2 illus, 7 tables, 35 ref

000688   Asha B;Nehru Kumar V (Civil Engineering Dep, Annamalai Univ, Annamalainagar-608 002) : Effect of hydraulic retention time for treating distillery effluent in diphasic anaerobic digester. J Ind Pollut Control 2007, 23(1), 25-30.

Diphasic anaerobic digesters have inherent advantages of exclusive process controls on the growth of microorganisms independently in acidogenic and methonogenic phases. A laboratory model of 15.0L effective volume with 2.5L of acidogenic reactor and 13.5L of methonogenic reactor was used to evaluate the treatability of distillery wastewater stream. The model was run for varying concentrations of COD and influent rates to study the effect of hydraulic retention time in reducing the COD into unharmful end products. The COD removal efficiency is found to vary from 17.67 to 26.19 % for the acidogenic reactor under the varying HRT of 0.96 to 2.89 days and 59.51 to 77.42% with varying HRT conditions from5.21 to 15.63 days for the methanogenic reactor. The overall COD removal of the system is observed at an efficiency of 82.30% for the system HRT of 18.52 days.

7 illus, 1 table, 7 ref

000687   Akpinar E K;Bicer Y (Mechanical Engineering Dep, Firat Univ, 23279, Elazig, Turkey, Email: ebruakpinar@firat.edu.tr) : Modelling of thin layer drying kinetics of sour cherry in a solar dryer and under open sun. J scient ind Res 2007, 66(9), 764-71.

Drying kinetics of sour cheery is investigated in solar dryer with forced convection and under open Sun with natural convection. Drying data were fitted to different mathematical models, whose performance was investigated by comparing coefficient (R). reduced chi-square (C²₅) and root mean square error (RMSE) between the observed and predicted moisture ratios. Among these models, drying model developed by Midilli and Kucuk model showed good agreement with the data obtained from the experiments in the solar dryer with forced convection drying mode. Logarithmic model has shown a better fit to the experimental sour cherries data for open sun drying with natural convection mode than the other models.

7 illus, 3 tables, 22 ref

000686   Agrawal A K;Raina S;Rajkumar;Kamath S (Microwave Tube Research & Development Centre, DRDO, , Bangalore-560 013, Email: agrawal_ak2000@yahoo.com) : Simulation of resonant meander-line attenuators for high-power helix traveling-wave tubes. Asian J Phys 2008, 17(2), 279-84.

A lossy meander-line, coated on dielectric helix-support rods, that provides resonant attenuation for high power traveling-live tubes was simulated by 3D modeling in HFSS (high frequency structure simulator) and the results validated against experiment with respect to the resonant frequency. The electric fields that are concentrated near the meander-line placed between the helix turns provided an effective attenuation at the resonant frequency. The helix dimensions and the meander-line dimensions significantly controlled the attenuation and the resonant frequencies, respectively.

5 illus, 1 table, 6 ref