Use Of Tray Research Articles

FEATURES OF NATURAL GAS DEMETHANIZATION PROCESS

Today, a significant part of the raw materials used in industry consists of natural gas. Thus, an important and urgent task for the further development of the industry is the development of more advanced processes aimed at natural gas treatment and processing of. Low temperature processes in gas processing are widespread due to the increasing demand for individual hydrocarbons and the growing demand for liquefied gases. Low temperature distillation remains the most important method for separating gas mixtures, especially when high throughput is required. The demethanization process is an industrially important example of such a process, which involves the interaction of separation, cooling and heat recovery systems.This article discusses a number of basic methods for low-temperature gas separation, such as condensation, rectification, absorption and separation, as well as the features of their application. Low-temperature separation is carried out in two stages in column-type apparatuses, the first of which demethanization is carried out with methane and C2+ fractions release. An overview of the demethanization process currently used for natural gas refining is given, and the key features of the demethanizer operation are described. The technological design of the process of low-temperature distillation, the design features of the installations are considered, a typical scheme of the demethanization process is given. Various technological schemes of demethanization proposed in patents are analyzed. A comparative analysis of the use of tray and packed contact devices and criteria for choosing a mass transfer column apparatus are given. The demethanization column arrangement is shown, the internal devices of the column, the feed input system, as well as the method of supplying heat to the demethanizer are described.

Comparative Time-Dependent Evaluation of Dimensional Accuracy of Dies Using Different Tray Adhesives: An In Vitro Study

Abstract Statement of Problem The adhesion of impression material to impression tray is very important. Tray adhesive plays a major role in making accurate impression. Although manufactures recommend the use of particular tray adhesives, comparison of their affective adhesiveness has not been reported. The effect of use of tray adhesives on dimensional accuracy of dies has not been established. Purpose The aim of this study was to compare the dimensional accuracy of dies using different tray adhesives at different time intervals. Materials and Methods First part of study comprised 120 samples in six groups with 20 samples in each group. First group comprised samples with no tray adhesive, and in other five groups, different types of tray adhesives were applied. The dies obtained were evaluated for upper diameter, lower diameter, and occlusogingival height. In the second part, there were a total of 125 samples in five groups with 25 samples in each group. Five different types of tray adhesive were applied for five different time intervals 5, 10, 15, 20, and 25 minutes, respectively. The specimens were tested in tensile mode for its debonding force at a crosshead speed of 5 mm/min, until separation failure occurred. Results Significant difference was seen for upper and lower diameters when compared with the group without any tray adhesive. The maximum bond strength was found in the group in which tray adhesive was applied for 20 minutes.

Terahertz scanning techniques for paint thickness on CFRP composite solid laminates

Terahertz ray (T-ray) scanning applications are promising tools. The use of T-ray for nondestructive evaluation was investigated on composite materials. In this characterization procedure, electromagnetic properties, such as the refractive index, were analyzed. The estimates of properties are in good agreement with known data. We successfully demonstrated the characteristics of T-ray propagating through Carbon fiber-reinforced plastic (CFRP) composites to acquire the refractive index by using the characterized material properties. A T-ray technique was developed for measuring paint thickness on CFRP laminates. Good results were obtained from tests performed on standard paint samples with thickness starting from approximately 100 μm. The method was based on reflection mode measurement with time of flight. Another method developed for measuring paint thickness using resonance frequencies was utilized to determine paint thickness on composite laminates. The paint thickness deduced from resonance frequencies agrees well with the result obtained directly from time-domain echoes.

Optimization Scheme Selection on Bamboo-Wood Pallet Technological Process

The use of tray is the basis to improve the operation efficiency of the entire logistics systematic and can reduce logistics cost. The total amount of tray is a measure of the modern logistics technology level in a country. Study on pallets with a new type of green materials has a far-reaching impact for the development of modern logistics in China. As a new type of green pallet, bamboo-wood pallet with high research value is used to replace wooden pallet. Its production process is complex, which affects its promotion. Analytic hierarchy process is used to analyze the manufacture of bamboo-wood pallet border. Easier manufacture methods and optimized technological process are achieved.

Flower Initiation in June-bearing Strawberry as Affected by Crown Depth, Age, and Size of Tray Plants

The use of tray grown transplants is becoming popular for substrate strawberry production. Although tray plant production with hanging runner cuttings is a laborsaving propagation procedure for forcing of June-bearing strawberries, the tray grown plants are inferior to pot grown plants in terms of earliness and uniformity of flowering. The crowns of rooted tray plants are often deeply drawn into medium by their own roots. The effect of crown depth, age, and size of tray plants on flowering of June-bearing strawberry (Fragaria × ananassa Duch. ‘Nyoho’) were investigated. Tissue temperature around the apical meristem was lower, and earlier and more uniform flower bud differentiation was obtained in the crown stripped or shallow-grown plants compared to deeply embedded plants. Flowering was later in young and small tray plants compared to aged large plants. By applying crown stripping, early and uniform flowering could be obtained even in the young and small tray plants. The variation in the depth of crown was clarified to be a cause of poor flowering performance of the tray grown strawberry plants. To obtain productive tray grown transplants, crown stripping would be an efficient procedure in practice.