NFPA 701:2015-Standard Methods of Fire Tests for Flame Propagation of Textiles and Films

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NFPA 701:2015

Standard Methods of Fire Tests for Flame Propagation of Textiles and Films

New Methods for Determining Capacity of Bottlenecks on Freeways

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New Methods for Determining Capacity of Bottlenecks on Freeways

Rahim F. Benekohal - Professor of Civil and Environmental Engineering University of Illinois at Urbana-Champaign
Hani Ramezani - Graduate Research Assistant University of Illinois at Urbana-Champaign

چکیده مقاله:

Accurate determination of capacity of bottlenecks is essential for proper traffic management in and around bottlenecks. Restrictions in roadway geometry or traffic composition, or implementation of new operational policies may create a chock-point on a freeway. Regardless of the cause of bottleneck, the effects are often congestion, queue, and increase in travel time. Bottlenecks may also create unsafe driving conditions and may increase the chance of rear-end collisions. This paper presents two new methodologies for finding bottleneck (i.e. work zone) capacity and operating speed: Four-Regime Models (FRM) and Updated Highway Capacity Manual (UHCM). The paper briefly discusses the factors affecting speed and capacity, and then compares the values estimated by the two methods for four different real-world work zone scenarios. The scenarios cover different speed limits, presence of flagger, and work activity levels. The results showed that FRM estimated values for speed and capacity represent the conditions more accurately than UHCM results because the FRM directly considers the presence of flagger and work activity, but UHCM does not.

کلیدواژه‌ها:

freeway, bottleneck, work zone, capacity, four-regime speed flow, congestion, queue

IEC 60793:2014-Optical fibres – Part 1-51: Measurement methods and test procedures – Dry heat (steady state) tests

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IEC 60793:2014-Optical fibres – Part 1-51: Measurement methods and test procedures – Dry heat (steady state) tests

Lecture Notes for Methods in Cell Biology

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Lecture Notes for
Methods in Cell Biology
(TRMD 623)
Instructor:
Mark F. Wiser

THREE-PHASE DIODE RECTIFIERS WITH LOW HARMONICS Current Injection Methods, 2007, Springer

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THREE-PHASE DIODE RECTIFIERS WITH LOW HARMONICS Current Injection Methods

2007, Springer

فهرست مطالب

Introduction 1
Three-Phase Diode Bridge Rectifier 7
Principles of Current Injection 23
Current Injection Devices 31
The Optimal Third-Harmonic Current Injection 73
Current Injection Networks for the Third-Harmonic Current Injection 91
The Optimal Current Injection 117
Current Injection Networks for the Optimal Current Injection 127
Operation of the Rectifier in the Discontinuous Conduction Mode 141
Recovery of the Current Injection Network Power Applying
a Current-Loaded Resistance Emulator 165
Recovery of the Current Injection Network Power Applying
a Voltage-Loaded Resistance Emulator 193
Current Injection Applying a Switching Current Injection Device 233
viii Contents
Rectifiers that Apply Square-Wave Current Injection 267
Conclusions 303
References 307
Index 311