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Very low attenuation of 9.3 Gc elastic waves in quartz at 4.2°K 石英中9.3 Gc弹性波在4.2°K时衰减非常小
Physics Letters Pub Date : 1966-12-12 DOI: 10.1016/0031-9163(66)90205-8
M.G. Blair , E.H. Jacobsen
{"title":"Very low attenuation of 9.3 Gc elastic waves in quartz at 4.2°K","authors":"M.G. Blair ,&nbsp;E.H. Jacobsen","doi":"10.1016/0031-9163(66)90205-8","DOIUrl":"10.1016/0031-9163(66)90205-8","url":null,"abstract":"<div><p>Attenuation measurements on compressional elastic waves in quartz at 9.3 Gc/s and at 4.2°K reveal unexpectedly low values of the order of 10<sup>-3</sup> db/cm. The trend of our data for increasing lengths of sample suggest that most of the observed loss results from imperfect end faces, and that the true bulk attenuation may be less than 10<sup>-4</sup> db/cm at x-band frequencies.</p></div>","PeriodicalId":101027,"journal":{"name":"Physics Letters","volume":"23 11","pages":"Pages 647-648"},"PeriodicalIF":0.0,"publicationDate":"1966-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0031-9163(66)90205-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77620615","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: 9
“Rotating frame” proton spin-lattice relaxation measurements of stereoregular polymethymethacrylates 立体规则聚甲基丙烯酸甲酯的“旋转框架”质子自旋-晶格弛豫测量
Physics Letters Pub Date : 1966-12-12 DOI: 10.1016/0031-9163(66)90214-9
T.M. Connor , A. Hartland
{"title":"“Rotating frame” proton spin-lattice relaxation measurements of stereoregular polymethymethacrylates","authors":"T.M. Connor ,&nbsp;A. Hartland","doi":"10.1016/0031-9163(66)90214-9","DOIUrl":"10.1016/0031-9163(66)90214-9","url":null,"abstract":"<div><p><em>T</em><sub>1ϱ</sub> measurements have been made on samples of stereoregular polym frequencies and activation energies obtained for the molecular motions observed agree well with previous relaxation measurements on these materials.</p></div>","PeriodicalId":101027,"journal":{"name":"Physics Letters","volume":"23 11","pages":"Pages 662-663"},"PeriodicalIF":0.0,"publicationDate":"1966-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0031-9163(66)90214-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74241535","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 effect of frequency on ionic solutions 频率对离子溶液的影响
Physics Letters Pub Date : 1966-12-12 DOI: 10.1016/0031-9163(66)90215-0
S.H.M. El-Sabeh
{"title":"The effect of frequency on ionic solutions","authors":"S.H.M. El-Sabeh","doi":"10.1016/0031-9163(66)90215-0","DOIUrl":"10.1016/0031-9163(66)90215-0","url":null,"abstract":"<div><p>Conductivity measurements were carried out at different frequencies and temperatures on 0.005 and 0.01 normal potassium chloride solutions. The ratio between the high frequency conductivity to low frequency conductivity was found to be greater than unity. This ratio increases with frequency and decreases with concentration.</p></div>","PeriodicalId":101027,"journal":{"name":"Physics Letters","volume":"23 11","pages":"Pages 663-664"},"PeriodicalIF":0.0,"publicationDate":"1966-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0031-9163(66)90215-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80231493","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
Phonon dispersion relations in beryllium using the pseudo potential approach 用伪势方法研究铍中的声子色散关系
Physics Letters Pub Date : 1966-12-12 DOI: 10.1016/0031-9163(66)90196-X
V.C. Sahni , G. Venkataraman , A.P. Roy
{"title":"Phonon dispersion relations in beryllium using the pseudo potential approach","authors":"V.C. Sahni ,&nbsp;G. Venkataraman ,&nbsp;A.P. Roy","doi":"10.1016/0031-9163(66)90196-X","DOIUrl":"10.1016/0031-9163(66)90196-X","url":null,"abstract":"<div><p>Phonon dispersion relations in beryllium are calculated using the pseudo potential method and compared with the experimental data of Schmunk et al.</p></div>","PeriodicalId":101027,"journal":{"name":"Physics Letters","volume":"23 11","pages":"Pages 633-634"},"PeriodicalIF":0.0,"publicationDate":"1966-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0031-9163(66)90196-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78625861","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: 7
Interaction of magneto-plasma waves in a two component solid state plasma 双组分固态等离子体中磁等离子体波的相互作用
Physics Letters Pub Date : 1966-12-12 DOI: 10.1016/0031-9163(66)90212-5
P.R. Beaudet , A. Houghton
{"title":"Interaction of magneto-plasma waves in a two component solid state plasma","authors":"P.R. Beaudet ,&nbsp;A. Houghton","doi":"10.1016/0031-9163(66)90212-5","DOIUrl":"10.1016/0031-9163(66)90212-5","url":null,"abstract":"<div><p>The selfsustained electromagnetic modes of compensated and uncompensated two component magneto-plasmas are studied using a local self consistent field theory which includes collisions. It is shown that in the case of an uncompensated plasma (a deficiency of the heavier particle) the two modified Alfvén modes of the system, one of which is helicon-like when <em>q</em> → 0, always interact and separate at finite angles of propagation to the d.c. magnetic field.</p></div>","PeriodicalId":101027,"journal":{"name":"Physics Letters","volume":"23 11","pages":"Pages 658-660"},"PeriodicalIF":0.0,"publicationDate":"1966-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0031-9163(66)90212-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86399025","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
Correlation between optical and radio emission from extensive air showers at large zenith angles 大天顶角大范围空气阵雨的光学和无线电发射的相关性
Physics Letters Pub Date : 1966-12-12 DOI: 10.1016/0031-9163(66)90223-X
B. McBreen , E.P. O'Mongain , N.A. Porter , P.J. Slevin
{"title":"Correlation between optical and radio emission from extensive air showers at large zenith angles","authors":"B. McBreen ,&nbsp;E.P. O'Mongain ,&nbsp;N.A. Porter ,&nbsp;P.J. Slevin","doi":"10.1016/0031-9163(66)90223-X","DOIUrl":"10.1016/0031-9163(66)90223-X","url":null,"abstract":"<div><p>Evidence has been found for correlation between optical and radio emission from extensive air showers at large zenith angles, using a Čerenkov optical detector and wide-band radio system.</p></div>","PeriodicalId":101027,"journal":{"name":"Physics Letters","volume":"23 11","pages":"Pages 677-678"},"PeriodicalIF":0.0,"publicationDate":"1966-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0031-9163(66)90223-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80723221","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: 5
Temporary negative ion resonances in benzene and benzene derivatives 苯和苯衍生物中的暂时负离子共振
Physics Letters Pub Date : 1966-12-12 DOI: 10.1016/0031-9163(66)90211-3
R.N. Compton , L.G. Christophorou, R.H. Huebner
{"title":"Temporary negative ion resonances in benzene and benzene derivatives","authors":"R.N. Compton ,&nbsp;L.G. Christophorou,&nbsp;R.H. Huebner","doi":"10.1016/0031-9163(66)90211-3","DOIUrl":"10.1016/0031-9163(66)90211-3","url":null,"abstract":"<div><p>New, intense, energy loss resonances below the first excitation potential were discovered in the electron impact excitation spectra of benzene and six of its derivatives. The observed resonances for o-C<sub>6</sub>H<sub>4</sub>CH<sub>3</sub>Cl, C<sub>6</sub>H<sub>5</sub>Cl, C<sub>6</sub>H<sub>5</sub>Br and o-<sub>6</sub>H<sub>4</sub>Cl<sub>2</sub> peak at exactly the same energy as the dissociative electron capture resonances previously reported for these compounds, suggesting that both resonances proceed via a common temporary negative ion state of the parent molecules.</p></div>","PeriodicalId":101027,"journal":{"name":"Physics Letters","volume":"23 11","pages":"Pages 656-658"},"PeriodicalIF":0.0,"publicationDate":"1966-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0031-9163(66)90211-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83792567","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: 41
Thermodynamical behaviour of type-II superconductors with small K near the lower critical field 低临界场附近小K型超导体的热力学行为
Physics Letters Pub Date : 1966-12-12 DOI: 10.1016/0031-9163(66)90188-0
L. Kramer
{"title":"Thermodynamical behaviour of type-II superconductors with small K near the lower critical field","authors":"L. Kramer","doi":"10.1016/0031-9163(66)90188-0","DOIUrl":"10.1016/0031-9163(66)90188-0","url":null,"abstract":"<div><p>The interaction between well-separated Abrikosov vortices is calculated for superconductors with <span>K</span> &lt; √2. For <span>K</span> &gt; 1/√2 a λ-transition takes place at <em>H</em><sub>c1</sub>, changing into a first order transition as <span>K</span> → 1/√2.</p></div>","PeriodicalId":101027,"journal":{"name":"Physics Letters","volume":"23 11","pages":"Pages 619-620"},"PeriodicalIF":0.0,"publicationDate":"1966-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0031-9163(66)90188-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82041540","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: 44
Fermi hole and 3He structure factor 费米空穴和3He结构因子
Physics Letters Pub Date : 1966-12-12 DOI: 10.1016/0031-9163(66)90221-6
T. Gaskell , W. Jones , N.H. March
{"title":"Fermi hole and 3He structure factor","authors":"T. Gaskell ,&nbsp;W. Jones ,&nbsp;N.H. March","doi":"10.1016/0031-9163(66)90221-6","DOIUrl":"10.1016/0031-9163(66)90221-6","url":null,"abstract":"<div><p>It is proposed that accurate measurement of the structure factor <em>S(k)</em> in <sup>3</sup>He by X-rays can lead to an experimental test of some features associated with the sharpness of the Fermi surface. The modifications of the Fermi hole due to interactions and to thermal effects are briefly considered.</p></div>","PeriodicalId":101027,"journal":{"name":"Physics Letters","volume":"23 11","pages":"Pages 673-675"},"PeriodicalIF":0.0,"publicationDate":"1966-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0031-9163(66)90221-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89917917","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: 3
Temperature and frequency dependence of hypersonic attenuation in insulating crystals 高超声速衰减在绝缘晶体中的温度和频率依赖性
Physics Letters Pub Date : 1966-12-12 DOI: 10.1016/0031-9163(66)90207-1
R. Klein
{"title":"Temperature and frequency dependence of hypersonic attenuation in insulating crystals","authors":"R. Klein","doi":"10.1016/0031-9163(66)90207-1","DOIUrl":"10.1016/0031-9163(66)90207-1","url":null,"abstract":"<div><p>Two effects are discussed which can explain the deviations of hypersonic attenuation, Γ, from Γ≈ω<em>T</em><sup>4</sup>.</p></div>","PeriodicalId":101027,"journal":{"name":"Physics Letters","volume":"23 11","pages":"Pages 651-652"},"PeriodicalIF":0.0,"publicationDate":"1966-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0031-9163(66)90207-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85596383","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: 4
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