Highway Research Record最新文献

Design of Experiments 实验设计

Highway Research Record Pub Date : 2010-09-17 DOI: 10.1002/0471238961.0405190908010814.A01.PUB3

V. L. Anderson

引用次数: 151

TRAVEL TO OUTDOOR RECREATION AREAS IN KENTUCKY 去肯塔基州的户外休闲区旅行

Highway Research Record Pub Date : 1972-09-01 DOI: 10.1080/00222216.1972.11970096

J. Deacon, J. Pigman, R. Deen

引用次数: 5

ENVIRONMENTAL QUALITY OF CITY STREETS: THE RESIDENTS' VIEWPOINT 城市街道环境质量:居民的观点

Highway Research Record Pub Date : 1972-03-01 DOI: 10.1016/B978-0-08-023686-5.50014-6

D. Appleyard, M. Lintell

引用次数: 362

NEW TIRE-STUD DEVELOPMENTS 新的轮胎钉开发

Highway Research Record Pub Date : 1972-02-01 DOI: 10.4271/720116

Rolf J. Cantz

{"title":"NEW TIRE-STUD DEVELOPMENTS","authors":"Rolf J. Cantz","doi":"10.4271/720116","DOIUrl":"https://doi.org/10.4271/720116","url":null,"abstract":"ALTHOUGH THEY OFFER SNOWBELT MOTORISTS SUBSTANTIAL IMPROVEMENT OF VEHICLE CONTROL ON ICY ROADS, STUDDED TIRES HAVE BEEN ATTACKED WITH INCREASING VIGOR BY HIGHWAY OFFICIALS FOR THEIR CONTRIBUTION TO ROAD WEAR. TESTS OF SOME RECENTLY DEVELOPED TIRE-STUD DESIGNS SHOW PROMISE THAT THE SAFETY AND CONVENIENCE FACTORS OF STUDDED TIRES CAN BE RETAINED-BUT WITH A CONSIDERABLE REDUCTION IN THE AMOUNT OF ROAD WEAR CAUSED BY THEIR USE. IN ADDITION TO A REDUCTION IN WEIGHT AND MINOR DIMENSIONAL CHANGES, MOST OF THESE NEW TIRE STUDS ARE DESIGNED IN SUCH A WAY THAT THE CARBIDE PIN WILL MOVE FARTHER INTO THE STUD BODY IF, AT ANY TIME, THE PROTRUSION OF THE STUD FROM THE TIRE EXCEEDS A CRITICAL LIMIT. (THE GREATER THE PROTRUSION IS, THE GREATER THE IMPACT FORCE IS; AND IT IS HIGH-IMPACT FORCE THAT CAUSES THE ROAD WEAR). WITH THEIR BUILT-IN PROTRUSION-ADJUSTMENT CAPABILITY, THE NEW TIRE STUDS MAINTAIN NEARLY UNIFORM PROTRUSION THROUGHOUT THEIR LIFETIME. THEIR ABILITY TO DO SO IS UNAFFECTED BY DIFFERENCES IN WEAR RESISTANCE OF VARIOUS RUBBER COMPOUNDS, DRIVING SPEEDS, OR ROAD SURFACES TRAVELED. TIRES FITTED WITH THESE NEW STUDS SHOW AN INCREASE OF 75 PERCENT IN COEFFICIENT OF FRICTION ON SMOOTH ICE AS COMPARED TO IDENTICAL TIRES WITHOUT STUDS. COEFFICIENT OF FRICTION DECREASES ONLY ABOUT 5 PERCENT WITH SUCH STUDDED TIRES ON BARE CONCRETE (CEMENT) ROADS. NO DIFFERENCE AT ALL IN PERFORMANCE BETWEEN STUDDED AND UNSTUDDED TIRES HAS BEEN FOUND ON BARE BITUMINOUS PAVEMENT, DRY OR WET.","PeriodicalId":202069,"journal":{"name":"Highway Research Record","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1972-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121207232","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

AN OPERATIONAL PLANNING INFORMATION SYSTEM FOR SMALL COMMUNITIES 小型社区的业务规划信息系统

Highway Research Record Pub Date : 1969-12-01 DOI: 10.5703/1288284313767

Robert L Maxman, W. L. Grecco

{"title":"AN OPERATIONAL PLANNING INFORMATION SYSTEM FOR SMALL COMMUNITIES","authors":"Robert L Maxman, W. L. Grecco","doi":"10.5703/1288284313767","DOIUrl":"https://doi.org/10.5703/1288284313767","url":null,"abstract":"THE WEALTH OF DATA COLLECTED ON THE URBAN AREA BY MANY PEOPLE FOR A MULTIPLICITY OF PURPOSES HAS LED TO AN INEFFICIENT, DISORGANIZED UTILIZATION OF RESOURCES FOR DATA HANDLING. UNTIL RECENTLY, MOST OF THE INFORMATION COLLECTED HAS BEEN GATHERED BY A SPECIFIC GROUP FOR A SPECIFIC PURPOSE. THIS INFORMATION WAS NOT USABLE BY OTHER THAN THE PRIMARY DATA RECIPIENT BECAUSE OF ITS NARROW DEFINITIONS AND SPECIFIC CHARACTERISTICS. PROVIDED HEREIN IS A SYSTEM WHEREBY DATA THAT ARE COLLECTED ONLY ONCE ARE USABLE BY ALL SEGMENTS OF THE URBAN ENVIRONMENT. UNIVERSALLY COMPATIBLE DEFINITIONS, AGGREGATION UNITS, AND PROCEDURES ARE DESCRIBED. COMPUTER PROGRAMS WERE DEVELOPED TO HANDLE THE DATA FOR THE SYSTEM. THE ENVIRONMENTAL DATA STORAGE AND RETRIEVAL SYSTEM (EDSARS) WILL MAKE A USEFUL TOOL FOR ALL SEGMENTS OF THE URBAN ENVIRONMENT BY PUTTING ALL GENERALLY USABLE DATA IN ONE PLACE WITH ONE SET OF DEFINITIONS AND AGGREGATED ON ONE USEFUL MODULE, USING ONE SET OF DATA HANDLING PROCEDURES. THE BASIC UNIT OF DATA COLLECTION ESTABLISHED WAS THE PARCEL, THEREBY PROVIDING A HIGH DEGREE OF FLEXIBILITY IN DATA AGGREGATION. THE CONCEPTUAL DEVELOPMENT OF INFORMATION THEORY AS IT APPLIES TO URBAN DATA SYSTEMS IS FIRST EXPLORED. THE ACTUAL CONCEPTUAL DEVELOPMENT OF EDSARS IS EXPLAINED NEXT, FOLLOWED BY THE OPERATIONAL PROCEDURES NEEDED TO UTILIZE THE EDSARS SYSTEM. /AUTHOR/","PeriodicalId":202069,"journal":{"name":"Highway Research Record","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1969-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127348219","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

ANALYSIS OF CONCRETE SLABS ON GROUND SUBJECTED TO WARPING AND MOVING LOADS 地面混凝土板在翘曲和移动荷载作用下的分析

Highway Research Record Pub Date : 1967-06-20 DOI: 10.5703/1288284314480

K. H. Lewis

{"title":"ANALYSIS OF CONCRETE SLABS ON GROUND SUBJECTED TO WARPING AND MOVING LOADS","authors":"K. H. Lewis","doi":"10.5703/1288284314480","DOIUrl":"https://doi.org/10.5703/1288284314480","url":null,"abstract":"A THEORY HAS BEEN DEVELOPED WHEREBY STRESSES AND DEFLECTIONS COULD BE CALCULATED FOR A SERIES OF RECTANGULAR SLABS LYING ON A VISCOELASTIC FOUNDATION AND SUBJECTED TO A MOVING LOAD. THE STRESSES AND DEFLECTIONS ARE CAUSED BY THE WEIGHT OF THE SLAB, THE MOVING CONCENTRATED LOAD, AND THE LINEAR TEMPERATURE (OR MOISTURE) VARIATIONS THAT CAUSE SUFFICIENT WARPING SO THAT THE SLAB IS ONLY PARTIALLY SUPPORTED BY ITS FOUNDATION. THE SUPPORT CONDITIONS WERE SIMULATED BY A KELVIN VISCO-ELASTIC MODEL, AND ZONES (WHICH DEPENDED ON THE VALUE OF SUB-GRADE REACTION) WERE SET UP SO THAT THE SOLUTIONS TO THE GOVERNING DIFFERENTIAL EQUATIONS COULD BE REDUCED TO A SET OF SIMULTANEOUS ALGEBRAIC EQUATIONS. THE EQUATIONS WERE SOLVED WITH THE AID OF AN IBM 7090 DIGITAL COMPUTER USING A FORTRAN SOURCE PROGRAM. IT WAS FOUND THAT WHEN PARTIAL SUPPORT CAUSED BY WARPING EXISTS, THE TENSILE STRESS IN THE SLAB CAN INCREASE WITH INCREASING VELOCITY OF LOAD. MOREOVER, THE MAXIMUM DEFLECTION (DOWNWARD) NEED NOT OCCUR WHEN THE VELOCITY OF THE LOAD IS EQUAL TO ZERO. THE REDUCTION IN SUBGRADE SUPPORT OVER A NARROW REGION (8 FT. OR LESS) LEADS TO DEFLECTIONS AND STRESSES THAT ARE HIGHER THAN THOSE CALCULATED USING THE INITIAL VALUE OF SUBGRADE REACTION. THIS IS PARTICULARLY EVIDENT WHEN THE LOAD IS OVER THE REGION OF REDUCED SUBGRADE REACTION. /AUTHOR/","PeriodicalId":202069,"journal":{"name":"Highway Research Record","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1967-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130678398","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 15

THE USES OF THEORY IN THE SIMULATION OF URBAN PHENOMENA 理论在城市现象模拟中的应用

Highway Research Record Pub Date : 1966-09-01 DOI: 10.1080/01944366608978207

B. Harris

引用次数: 31

Factors Influencing the Application of Nuclear Techniques to Soil Compaction Control 影响核技术在土壤压实控制中应用的因素

Highway Research Record Pub Date : 1966-09-01 DOI: 10.5703/1288284313701

T. Williamson

引用次数: 3

SYNCHRONIZING TRAFFIC SIGNALS FOR MAXIMAL BANDWIDTH 同步交通信号以获得最大带宽

Highway Research Record Pub Date : 1964-12-01 DOI: 10.1287/OPRE.12.6.896

J. Little, B. Martin, J. T. Morgan