HC Type Research Articles

The effect of orthopedic screw profiles on the healing time of femoral neck fracture

One possible treatment for femoral neck fractures, especially in young people, is the use of bone screws or Lug screws. The design of these implants requires taking into account the biocompatibility of materials, mechanical properties plus surface properties, and thread’s geometric, as well as chemical properties, etc. Various profiles are designed for fracture fixation. The most famous of these profiles, which are introduced by the ISO standard, are HB, HC, and HD type profiles. This article investigates the performance of these profiles in reducing or increasing the healing time. This study is based on the rule of bone remodeling and using a set of three-dimensional computational (finite element) models. The study revealed that the HB profile outperformed the other two profiles. Meanwhile, HD profile was also better than HC profile.

Analysis of protective features of concrete in precast prestressed floor slabs (HC type) against chloride penetration

This paper describes protective features of concrete used in precast prestressed floor slabs against chloride penetration. HC-500 hollow core slabs are designed for constructing ceilings in skeletal buildings with reinforced concrete. Material and structural protection used in slabs determines the acceptable range of using HC slabs, taking into account durability of floors during their normal exploitation. These slabs can be used in buildings where environmental conditions affect them according to the following exposure classes: X0, XC1, XC2, XC3 (according to standards: EN 206-1: 2003 [1], EN 1992-1-1:2004 [2]). Values of diffusion coefficient for concrete collected directly from precast prestressed HC-500 slabs, were determined during short (24h and 48h) tests accelerated by the electric field. In those tests we used a thermodynamic migration model and a reverse equation of chloride migration in concrete. Taking into consideration values of diffusion coefficient and diffusion equation, the time required for chloride concentration to reach critical value for reinforcement and the thickness of reinforcement cover were established under the condition that the structure durability was subjected to the exposure class XD3 (chapter 4 of the standard PN 1992-1-1[2]).

The Circuit Analysis and Performance Evaluation of an Hc Type Magnetic Coupling Contactless Power Transformer that is Compatible with Both Solenoid and Circular Type Transformers

SUMMARYThere are two types of the transformers in a contactless power transfer system: solenoid type (H‐shaped) and circular type transformers. These two types of transformers are not compatible because their magnetic field structures are different. An Hc type transformer that is compatible with both transformer types has been proposed. The Hc type receiver adds a central magnetic pole by dividing the winding coil of the H‐shaped receiver. The Hc type receiver can change the magnetic field structure by changing the connections of the divided windings and can receive power from both types of transmitters. In this study, we conducted a circuit analysis and evaluated the performance of the Hc type transformer.

円形及びソレノイド型磁界結合方式非接触給電トランスと共用可能なHc型トランスの回路解析と性能評価

There are two types of the transformers in a contactless power transfer system: solenoid type (H-shaped) and circular type transformers. These two types of transformers are not compatible because their magnetic field structures are different. An Hc type transformer that is compatible with both transformer types has been proposed. The Hc type receiver adds a central magnetic pole by dividing the winding coil of the H-shaped receiver. The Hc type receiver can change the magnetic field structure by changing the connections of the divided windings and can receive power from both types of transmitters. In this study, we conducted a circuit analysis and evaluated the performance of the Hc type transformer.

Energy efficiency enhancement of a domestic refrigerator using R436A and R600a as alternative refrigerants to R134a

This paper is devoted to feasibility study of substitution of two hydrocarbon refrigerants instead of R134a in a domestic refrigerator. Experiments are designed on a refrigerator manufactured for 105 g R134a charge. The effect of parameters including refrigerant type, refrigerant charge and compressor type are investigated. This research is conducted using R436A (mixture of 46% iso-butane and 54% propane) and R600a (pure iso-butane) as hydrocarbon refrigerants, HFC type compressor (designed for R134a) and HC type compressor (designed for R600a). The results show that for HFC type compressor, the optimum refrigerant charges are 60 g and 55 g for R436A and R600a, respectively. Moreover, for this type of compressor, the energy consumption of R436A and R600a at the optimum charges is reduced about 14% and 7%, respectively in comparison to R134a. On the other hand, when using HC type compressor, the optimum refrigerant charges for R436A and R600a are both 50 g, and the energy consumption of R436A and R600a at the optimum charges are reduced about 14.6% and 18.7%, respectively. Furthermore, when the refrigerator is equipped with HC type compressor, working under optimum charges of R436A and R600a have a total equivalent warming impact about 16% and 21% lower than base refrigerator, respectively.Total exergy destruction of the domestic refrigerator with HFC type compressor for R134a, R600a and R436A are 0.0389, 0.0301, 0.0471, respectively and for R600a and R436A with HC type compressor are 0.0292, 0.0472, respectively.

Intra- and intermolecular interactions and water pincer in the crystal structure of a 3-P(O)Ph2substituted 1,2,3,6-tetrahydrophosphinine oxide hydrate

Single crystal X-ray structure analysis of 3-diphenylphosphinoxido-1-phenyl-4-chloro-1,2,3,6-tetrahydrophosphinine oxide (1)·H2O provided experimental proof for a transannular PO⋯HC type interaction. The embedded water molecule bridges two PO groups of the P-heterocycle via intra-associate hydrogen bonds. Theoretical calculations showed that the conformation of the hetero-ring alters only slightly due to the presence of the water molecule. Thus 1 behaves as a preorganized host molecule for water, presenting a minimum ring-size molecular environment for water binding.

A Model Study of Interactions Between TcAChE Peripheral Site Segment Tyr70Val71 and Loop 1 of Fasciculin 2

The continuous chain of residues (Thr7 to Ala12) of Loopl of Fas2 (F1) and its interaction with the peripheral binding sites (Tyr70-Val71) of AChE (P1) has been studied. Our results suggest that the flexibility of Loopl might be caused by either the partially protonated guanidine group of Arg11 under experimental conditions or by the interaction with the negatively charged center of substrates. The binding energy of F1-P1 is predicted to be −16.6 kcal/mol at the B3LYP/6–311G(d,p) level, which is assumed to originate from one isolated O7…HN10 H-bond, one possible O10…HC71 unconventional O…HC type H-bonding, and the improved π-bonding cooperativity around the peptide group of the AChE segment Tyr70-Val71. The classical Kitaura-Morokuma energy decomposition analysis, the NPA charge analysis, and the AIM analysis consistently reveal that the peptide group in segment P1 is more polarizable, which might play the key role in the interactions between F1 and P1. The PCM solvent effect corrected results reveal decrease of the interaction energy of the considered model. The importance of Thr8 of Fas2 in the P-site binding of AChE is also concluded. Site-directed mutations on either the Fas2 residue of Thr8 or the AChE residue of Tyr70 are expected to alter the binding behavior of the Loop1 of Fas2 with AChE.

218. 9 インチハイコントラスト (HC) 型クラスファイバ I・I の臨床的有用性(第 48 回総会学術大会一般研究発表予稿)

218. 9 インチハイコントラスト (HC) 型クラスファイバ I・I の臨床的有用性(第 48 回総会学術大会一般研究発表予稿)

218. 出力蛍光面にグラスファイバを用いた 9 インチハイコントラスト型 I.I の臨床的有用性(X 線装置-6 I.I. 他)

218. 出力蛍光面にグラスファイバを用いた 9 インチハイコントラスト型 I.I の臨床的有用性(X 線装置-6 I.I. 他)

Electrical and optical properties and crystal structure of bis (dimethylglyoximato)Pt(II) at high pressures

The electrical resistivity, the electronic and infrared spectra, and the crystal structure in bis(dimethylglyoximato)Pt(II), Pt(dmg) 2, have been studied at high pressures. The electrical resistivity in the single crystal was measured under quasi-hydrostatic condition. The resistivity drastically decreased with increasing pressure; the metallic behavior was observed at around 4.6 GPa. Pt(dmg) 2 behaved again as a semiconductor above about 6 GPa. A new absorption band was found above 6 GPa. The intensity of the absorption band was abruptly increased with pressure over a narrow pressure range of 6 to 8 Gpa. The crystal structure of the complex was studied at high pressures. X-ray work for a single crystal was carried out by the use of the diamond-anvil cell developed by Merrill and Bassett. The lattice constants of three axes decreased rapidly with pressure; the b lattice constant was not sensitive to pressure above 1.5 GPa. Strong intermolecular contacts of O—HC type was observed between adjacent chains along the b axis at high pressure. The relation between the structure and the electrical and optical properties at high pressure is discussed.

Design of file organization schemes for selected query set on binary-valued attributes and their redundancies

In this paper we consider file organization schemes for binary-valued records and a selected set Q ( k )} of queries, each specifying k attributes. We let a partition of Q ( k )} into non-empty subsets correspond to the directory of a file organization scheme in such a manner that each area (bucket) in the directory is associated with one of those subsets. Then we consider the redundancy of the scheme which is defined as the average number of times the accession number of a record is stored. The record distribution used to estimate redundancies has the invariant property relative to the permutation of the attributes. A bucket corresponding to a set of queries in Q ( k )} which specify k − 1 attributes in common is called k -hyperclaw ( k − HC ) type. It is shown that the redundancy of a file organization scheme (called a k-HC -type scheme) whose buckets all are k − HC type is not greater than that of every possible file organization scheme with the same parameters. Furthermore, given the number of buckets a procedure for obtaining a k − HC type scheme with less redundancy than that of the other is also shown. Finally, in the case k = 2 a balanced file organization scheme having the least redundancy among all possible balanced file organization schemes with the same parameters is given from the graph-theoretic approach.

Purification of messenger ribonucleic acids for fast and slow myosin heavy chains by indirect immunoprecipitation of polysomes from embryonic chick skeletal muscle

Fast and slow myosin heavy chain mRNAs were isolated by indirect immunoprecipitation of polysomes from 14-day-old embryonic chick leg muscle. The antibodies were prepared against myosin heavy chains purified by NaDod-SO4-polyacrylamide gel electrophoresis and were shown to be specific for fast and slow myosin heavy chains. The RNA fractions directed the synthesis of myosin heavy chains in a cell-free translation system from wheat germ. Several smaller peptides were also synthesized in lower concentrations. These probably are partial products of myosin heavy chains, since they are immunoprecipitated with antibodies to myosin heavy chains. Immunoprecipitation of the translation products with the antibodies to fast and slow myosin heavy chains showed the RNA preparations to be approximately 94% enriched for fast myosin heavy chain mRNA and approximately 84% enriched for slow myosin heavy chain mRNA with respect to myosin HC type. Peptides having slightly different mobilities on NaDodSO4-polyacrylamide gels were immunoprecipitated by antibodies to fast and slow myosin heavy chains.

Virus-Specific Markers and Virus-Like Particles in Cell Lines of Tumors Produced by CELO Virus in Syrian Golden Hamsters2

Cell lines were established from 2 primary hepatocellular carcinomas (HC's) and 3 sarcomas produced in Syrian golden hamsters inoculated as newborns with chicken embryo lethal orphan (CELO) virus. Cell lines from 2 sarcomas (COT, CMT) and 1 HC (CEHEP) produced CELO virus-specific T-antigen. The antigen was not detected in cells of the third sarcoma line (RCT) until they had undergone more than 34 passages in vitro. Although 5-10% of cells in the second HC line (CILT/2) contained T-antigen during early passages, it was not demonstrable after the fifth subculture. Nevertheless, cells of both HC lines possessed CELO virus tumor-specific transplantation antigen. All 5 cell lines also contained hamster type R particles, and both HC lines had type C and intracytoplasmic type A particles. The percentage of carcinoma cells producing type R particles increased during cultivation in vitro, whereas the number of cells with type A particles decreased. Treatment with dibutyryl cyclic AMP and theophylline enhanced the number of cells producing type C particles in 1 HC line and type R particles in 2 sarcoma lines.

Bacterial aerosols generated by a package treatment plant

Abstract Airborne bacteria were monitored near the aeration tank of a package sewage treatment plant serving a mobile‐home community. The concentrations of airborne coliforms were similar to those found at a conventional activated sludge unit. HC type Millipore filters were found to be the most efficient for the recovery of airborne fecal coliforms.

X-Ray findings of early gastric carcinoma (hc type) located near cardia

X-Ray findings of early gastric carcinoma (hc type) located near cardia