Advances in cryogenic engineering最新文献

Revision of the family Haliplidae (Insecta, Coleoptera) in Japan. Revision of the family Haliplidae (Insecta, Coleoptera) in Japan.

IF 1.3

Advances in cryogenic engineering Pub Date : 2023-07-03 eCollection Date: 2023-01-01 DOI: 10.3897/zookeys.1168.99302

Masakazu Hayashi, Tomofumi Iwata, Hiroyuki Yoshitomi

引用次数: 0

Cone beam computed tomographic evaluation of two access cavity designs and instrumentation on the thickness of peri-cervical dentin in mandibular anterior teeth. 锥形束计算机断层扫描评估两种进洞设计和器械对下颌前牙颈周牙本质厚度的影响。

Advances in cryogenic engineering Pub Date : 2016-09-01 DOI: 10.4103/0972-0707.190018

Vinny Sara Varghese, John V George, Sylvia Mathew, Shruthi Nagaraja, H N Indiresha, K S Madhu

{"title":"Cone beam computed tomographic evaluation of two access cavity designs and instrumentation on the thickness of peri-cervical dentin in mandibular anterior teeth.","authors":"Vinny Sara Varghese, John V George, Sylvia Mathew, Shruthi Nagaraja, H N Indiresha, K S Madhu","doi":"10.4103/0972-0707.190018","DOIUrl":"10.4103/0972-0707.190018","url":null,"abstract":"Background and objectives: The aim of the study was to determine the effect of two access cavity designs on the peri-cervical dentin thickness before and after instrumentation using cone beam computed tomography (CBCT).Materials and methods: Sixty mandibular anterior teeth were divided into two groups of thirty teeth each: Group I: conventional access cavity preparation, where access was prepared just above the cingulum and Group II: incisal access cavity preparation, where access was prepared in proximity to the incisal edge. CBCT scans were taken preoperatively, following access cavity preparation and post instrumentation. 200 μm thick slices were obtained 4mm apical and coronal to the cemento-enamel junction. The peri-cervical dentin thickness was calculated on the facial, lingual, mesial, and distal for all the three obtained scans.Results: The analysis showed that access cavity preparation and instrumentation resulted in a significant loss of tooth structure in Group I on all surfaces, but in Group II, there was a significant loss of tooth structure only in the mesial, lingual, and distal surfaces (P < 0.05).Conclusion: Incisal access cavity preparation resulted in lesser loss of dentin in the peri-cervical region.","PeriodicalId":80359,"journal":{"name":"Advances in cryogenic engineering","volume":"613 1","pages":"450-4"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5026106/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80428422","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Aspect-Ratio Effect of He II Channels on the Heat Transport Characteristics He II通道宽高比对传热特性的影响

Advances in cryogenic engineering Pub Date : 2015-04-14 DOI: 10.1007/978-1-4613-0373-2_36

H. Kobayashi, Y. Akedo, K. Kawakami

引用次数: 1

Effect of Flow-Pressure Phase on Performance of Regenerators in the Range of 4 K to 20 K 4 ~ 20 K范围内流压相对蓄热器性能的影响

Advances in cryogenic engineering Pub Date : 2014-01-29 DOI: 10.1063/1.4860751

M. Lewis, R. P. Taylor, P. Bradley, R. Radebaugh

{"title":"Effect of Flow-Pressure Phase on Performance of Regenerators in the Range of 4 K to 20 K","authors":"M. Lewis, R. P. Taylor, P. Bradley, R. Radebaugh","doi":"10.1063/1.4860751","DOIUrl":"https://doi.org/10.1063/1.4860751","url":null,"abstract":"Modeling with REGEN3.3 has shown that the phase between flow and pressure at the cold end of 4 K regenerators has a large effect on their second-law efficiency. The use of inertance tubes in small 4 K pulse tube cryocoolers has limited phase-shifting ability, and their phase shift cannot be varied unless their dimensions are varied. We report here on the use of a miniature linear compressor, operating at the pulse tube warm end of about 30 K, as a controllable expander that can be used to vary the phase over 360°. We also use the back EMF of the linear motor to measure the acoustic power, flow rate amplitude, and phase between flow and pressure at the piston face. We discuss the measurements of the linear motor parameters that are required to determine the piston velocity from the back EMF as well as the measurement procedures to determine the back EMF when the expander is operating at a temperature around 30 K. Our experimental results on the performance of a regenerator/pulse tube stage operating below 30 K show an optimum performance when the flow at the phase shifter lags the pressure by about 65° to 80°, which is close to the model results of about 60°. Temperatures below 10 K were achieved at the cold end in these measurements. The efficiency of the compressor operating as an expander is also discussed.","PeriodicalId":80359,"journal":{"name":"Advances in cryogenic engineering","volume":"1573 1","pages":"562-569"},"PeriodicalIF":0.0,"publicationDate":"2014-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1063/1.4860751","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"58793604","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: 1

Forced convection heat transfer of subcooled liquid hydrogen in horizontal tubes 过冷液氢在水平管内的强制对流换热

Advances in cryogenic engineering Pub Date : 2012-06-12 DOI: 10.1063/1.4706987

H. Tatsumoto, Y. Shirai, M. Shiotsu, K. Hata, Y. Naruo, H. Kobayashi, Y. Inatani, Kensuke Kinoshita

引用次数: 14

Steady-State heat transfer through micro-channels in pressurized He II 加压He中微通道稳态传热研究[j]

Advances in cryogenic engineering Pub Date : 2012-06-12 DOI: 10.1063/1.4706925

P. Granieri, B. Baudouy, A. Four, Fernando Lentijo, A. Mapelli, P. Petagna, D. Tommasini

引用次数: 8

Cryocoolers for aircraft superconducting generators and motors 飞机超导发电机和电动机用制冷机

Advances in cryogenic engineering Pub Date : 2012-06-12 DOI: 10.1063/1.4706918

R. Radebaugh

引用次数: 22

Technical aspects of cold high pressure densification (CHPD) on long lengths of In Situ MgB2 wires with enhanced Jc values 提高Jc值的长长度原位MgB2钢丝冷高压致密化(CHPD)技术方面

Advances in cryogenic engineering Pub Date : 2012-06-12 DOI: 10.1063/1.4712116

R. Flukiger, M. S. Hossain, M. Kulich, C. Senatore

{"title":"Technical aspects of cold high pressure densification (CHPD) on long lengths of In Situ MgB2 wires with enhanced Jc values","authors":"R. Flukiger, M. S. Hossain, M. Kulich, C. Senatore","doi":"10.1063/1.4712116","DOIUrl":"https://doi.org/10.1063/1.4712116","url":null,"abstract":"The technical aspects correlated with the observed enhancement of mass density and critical current density in the filaments of in situ MgB2 wires by means of the recently developed Cold High Pressure Densification (CHPD) are reviewed. The present analysis first summarizes the results obtained by means of a short sample prototype device with anvil lengths of 39 mm. Pressures well above 1 GPa were applied to short wires, causing Jc enhancements between a factor 1.5 and 2.3 at 4.2 K and 8 T. At 20 K, the enhancement is much stronger and reaches a factor 3 for binary and 5 for alloyed MgB2 wires. Based on these results, an automatic machine has been developed allowing a sequential press/release/advance operation. With this machine, which has been very recently installed at GAP in Geneva, in situ MgB2 wires of lengths up to 10 meters have so far been successfully densified, confirming the Jc enhancements obtained with the short sample device. Using an improved anvil geometry, the wall friction was reduced with respect to the short sample prototype device, thus yielding the same Jc enhancements, but at considerably lower applied pressures: now, Jc max was obtained at 0.85 GPa, in contrast to values between 1.3 and 1.5 GPa for the short sample device. After densifying at this pressure, the value of Jc = 1 × 104 A/cm2 at 4.2 K was obtained at 13.2 T over 1 m length, thus corresponding to an enhancement by a factor 2.2 with respect to the non pressed wire. The present results are promising in view of the application of CHPD to industrial wire lengths.","PeriodicalId":80359,"journal":{"name":"Advances in cryogenic engineering","volume":"1435 1","pages":"353-362"},"PeriodicalIF":0.0,"publicationDate":"2012-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1063/1.4712116","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"58657839","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: 10

Development of a 15 K hydrogen-based sorption cooler 15k氢基吸附冷却器的研制

Advances in cryogenic engineering Pub Date : 2010-04-23 DOI: 10.1063/1.3422380

J. Burger, H. J. Holland, R. J. Meijer, M. Linder, H. T. Brake

引用次数: 6

INTERFACING ISSUES IN MICROCOOLING OF OPTICAL DETECTORS IN SPACE APPLICATIONS 空间应用中光学探测器微冷却的接口问题

Advances in cryogenic engineering Pub Date : 2010-04-23 DOI: 10.1063/1.3422411

J. H. Derking, H. T. Brake, M. Linder, H. Rogalla

引用次数: 1