Centrifugal gyration mill for fine product self-grinding

2020 ◽  
pp. 28-31
Author(s):  
Askarov E.S.
Keyword(s):  
Dynamic Balance ◽  
Rotation Frequency ◽  
Fine Grinding ◽  
Centrifugal Mill ◽  
High Dynamic ◽  
High Degree

A simplified design of a centrifugal mill for fine grinding of the product based on a parallelogram mechanism is proposed. A high dynamic balance was achieved, providing a high rotation frequency of the grinding chambers, and hence a high degree of the product grinding. Keywords centrifugal mill, parallelogram mechanism, selfgrinding, fine grinding

scholarly journals Investigation into the Fine Grinding of Limestone with a Super Centrifugal Mill

2010 ◽  
Vol 17 (1) ◽  
pp. 9-14 ◽  
Author(s):  
Naoya KOTAKE ◽  
Kiyohiro ENDO ◽  
Ikkou SATO ◽  
Susumu GUNJI ◽  
Yasuyoshi SEKINE ◽  
...  
Keyword(s):  
Fine Grinding ◽  
Centrifugal Mill

The locality of Beijing historic areas from a dynamic perspective based on geo-tagged photos

2019 ◽  
Vol 5 (1) ◽  
pp. 75-89
Author(s):  
Fang Wang ◽  
Wenying Hu ◽  
Yicai Zhu ◽  
Chunyan Jiang
Keyword(s):  
Dynamic Balance ◽  
Rapid Development ◽  
Content Type ◽  
Constituent Element ◽  
Historic Areas ◽  
Dynamic Perspective ◽  
History Of ◽  
Constituent Elements ◽  
High Degree ◽  
Historic Area

Purpose Due to rapid development, historic city areas are faced with urbanization damage to their characteristic urban identity besides physical deterioration and economic decay. The purpose of this paper is to address the following questions: What are the constituent elements of locality for historic areas? How does one classify historic areas according to locality elements? What are the characteristics of each kind of historic area? How does one identify to-be-protected locality elements according to different historic areas to realize sustainable development? Design/methodology/approach As a historic cultural city with a building history of over 3,000 years, Beijing has a myriad of distinctive historic areas, of which 367 were selected as the research samples. This paper classifies historic areas into the following four categories: distinctive areas, permanent areas, adaptive areas and inherited areas by analyzing the locality elements of 8,905 geo-tagged photos related to Beijing historic areas. The correlation among locality elements – the basis for joint protection – is also examined by Pearson’s correlation analysis. Findings The results are as follows: the reaction degree of carrier elements is generally higher than that of information elements, of which the representative architecture is the main constituent element of locality; folk customs, traditional activities and other intangible cultural heritage in historic areas receive only slight attention and need to be further stressed; controlled by non-human factors, permanent elements bear a high degree of autocorrelation; and emerging tourism and business activities have, to some extent, grown into constituent parts of the locality elements in historic areas. Originality/value This paper seeks to strike a dynamic balance between city renewal and historic area protection, providing a reference for understanding the dynamics of locality.

scholarly journals The Study of Three-Dimensional Granular Stream Flowing through the Test Hopper-Shaped Target

2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
Chengwen Qiang ◽  
Weifeng Yang ◽  
Long Li ◽  
Fei Wang ◽  
Weiping Deng ◽  
...  
Keyword(s):  
Flow Rate ◽  
Inclination Angle ◽  
Granular Flow ◽  
Dynamic Balance ◽  
Three Dimensional ◽  
Rotation Frequency ◽  
Gravity Flow ◽  
Screw Conveyor ◽  
Dense Flow ◽  
Elevated Frequency

The experiments are carried out in a three-dimensional channel with a screw conveyor, which plays the role of granular drives for the granular flow system and determines the injection of granular in the test target section. The jam-to-dense transition of granular flow is studied with the different inclination angle. The results show that, with a fixed diameter of hopper orifice and initial filling position, there is a change from jam to dense when the inclination angle larger than 22°. Variation of the flow rate with elevated frequency of the screw conveyor is further studied. The flow pattern is changed from dilute to dense with increasing rotation frequency of the screw rod. When the rotation frequency is larger than 5 Hz, the flow is dense. The dynamic balance of the interface between dilute to dense granular is observed in the main target section. We further research the dynamic interface by measuring the highest and lowest location with time and also simulate the gravity flow rate and screw conveyor flow rate with EDEM. From the results, we find that the interface between dilute flow and dense flow is influenced by the combined action of crew conveyor flow and dense gravity flow.

scholarly journals Highly porous granulated corundum aggregate prepared out of alumina-polystyrene-foam mixture. Part 7. The study of possibility to prepare the hollow corundum pellets

2018 ◽  
pp. 53-55
Author(s):  
V. N. Sokov
Keyword(s):  
Fractional Composition ◽  
Rotation Frequency ◽  
Production Quality ◽  
Polystyrene Foam ◽  
Technical Alumina ◽  
Plate Rotation ◽  
High Dynamic ◽  
Highly Porous

Fractional composition of the corundum pellets is defined mostly by the polystyrene foam balls grading, by the mixture moisture, and by the granulation's parameters. The using of the high dynamic packing loading influences negatively on the production quality. The plate' rotation frequency, its angle and the granulation time were established in the article. The conditions of the hollow pellets production on base of the technical alumina were developed.

scholarly journals Investigation of Operational Conditions for Fine Grinding of Limestone with a Super Centrifugal Mill

2009 ◽  
Vol 16 (1/2) ◽  
pp. 11-15
Author(s):  
Naoya KOTAKE ◽  
Ikkou SATO ◽  
Sho MAKUTA ◽  
Susumu GUNJl ◽  
Hiroaki KEZUKA
Keyword(s):  
Operational Conditions ◽  
Fine Grinding ◽  
Centrifugal Mill

A Balance Method Without Trial Mass Based on Lag Phase

2013 ◽  
Author(s):  
Dan-mei Xie ◽  
Yi Yang ◽  
Zhan-hui Liu ◽  
Yang-heng Xiong ◽  
Heng-liang Zhang ◽  
...  
Keyword(s):  
High Speed ◽  
Dynamic Balance ◽  
Balance Method ◽  
Lag Phase ◽  
Dynamic Balancing ◽  
Generator Rotor ◽  
Mass Unbalance ◽  
Turbo Generator ◽  
Generator Unit ◽  
High Degree

Mass unbalance is one of the most common faults found in steam turbine shafting. It was reported that about 70% of the total turbo-generator units newly put into commission needs high-speed dynamic balance in site. Because of longer shafting and relatively lower support stiffness, the vibration of multi-rotor bearing system, is much more sensitive to mass-unbalance. In most cases, trial masses and runs are required for the calculation of correction masses before balancing a turbo-generator rotor and such a procedure is time-consuming and expensive. Our experience shows that one balance for a turbo-generator rotor in China, by using traditional balance method, will take at least 3 to 5 runs, even 6 to 10 runs. That means 100∼500t oil will be consumed each time for balancing a turbo-generator unit with capacity of 200MW to 600MW. A balancing method without trial mass was proposed at the end of 1980’s. As it needs no trial runs if the magnitude and orientation of the rotor unbalance could be determined by calculating the amplitude-frequency and phase-frequency characteristics of various rotor sections, it has been adopted by highly skilled engineers. But the principle disadvantage of this method is that effective application requires a high degree of operator insight or knowledge of the support characteristics (i.e., requires data taken at previously balanced procedure, or from other units to determine the magnitude and location of the unbalance). This paper deduced empirical formula for dynamic balancing without trail mass at first. Then, based on the data of lag phase from the experience over 100 units, a balance method without trial mass was developed. Implementation of this method on a 1000MW turbo-generator rotor shows that it is an effective and economical procedure and the balancing risk is reduced.

Towards a unified understanding of basic notions and terms in humanoid robotics

Robotica ◽  
2006 ◽  
Vol 25 (1) ◽  
pp. 87-101 ◽  
Author(s):  
M. Vukobratović ◽  
B. Borovac ◽  
V. Potkonjak
Keyword(s):  
Degrees Of Freedom ◽  
Dynamic Balance ◽  
Humanoid Robots ◽  
External Disturbances ◽  
Humanoid Robotics ◽  
Gait Stability ◽  
High Dynamic ◽  
The Difference ◽  
The Stability ◽  
And Control

The intention of this paper is to contribute towards a unified understanding of the basic notions and terms in the domain of humanoid robotics, having in mind that the same notions are sometimes interpreted in different ways (some interpretations are contradictory, and some even erroneous). Hence, the first part of the paper is devoted to defining some basic notions, walk and gait being among the first. Then, the paper deals with the notion of dynamic balance and stability, particularly the difference between them, since these essentially different notions are often confused and, rarely, regarded as identical. As dynamic balance is directly related to the notion of zero-moment point (ZMP), it was necessary to touch upon some misunderstandings concerning the ZMP. Gait stability is an especially delicate category, as humanoid locomotion systems have certain specific features that are not possessed by other systems. Namely, because of external disturbances, there may appear unpowered (passive) degrees of freedom that cause loss of dynamic balance. Hence, these unpowered degrees of freedom cannot be overlooked in the stability analysis. As the stability of motion of humanoid robots is inseparably linked with control, it was also necessary to pay due attention to this notion. Finally, the paper ends with a discussion of posture and postural stability with all their specificities. The authors hope that this paper will contribute to a clearer understanding of the basic notions of humanoid robotics, especially concerning robots with high dynamic and control performances.

Tissue section lifting for electron microscopy

1978 ◽  
Vol 36 (2) ◽  
pp. 86-87
Author(s):  
Adrian F. van Dellen
Keyword(s):  
Infectious Disease ◽  
Electron Microscopy ◽  
Tissue Culture ◽  
Organ System ◽  
Surrounding Tissue ◽  
Paraffin Sections ◽  
Surface Areas ◽  
Specific Determination ◽  
High Degree ◽  
Accuracy And Repeatability

The morphologic pathologist may require information on the ultrastructure of a non-specific lesion seen under the light microscope before he can make a specific determination. Such lesions, when caused by infectious disease agents, may be sparsely distributed in any organ system. Tissue culture systems, too, may only have widely dispersed foci suitable for ultrastructural study. In these situations, when only a few, small foci in large tissue areas are useful for electron microscopy, it is advantageous to employ a methodology which rapidly selects a single tissue focus that is expected to yield beneficial ultrastructural data from amongst the surrounding tissue. This is in essence what "LIFTING" accomplishes. We have developed LIFTING to a high degree of accuracy and repeatability utilizing the Microlift (Fig 1), and have successfully applied it to tissue culture monolayers, histologic paraffin sections, and tissue blocks with large surface areas that had been initially fixed for either light or electron microscopy.

Electron Microscopy in Molecular Biology

1967 ◽  
Vol 25 ◽  
pp. 2-3
Author(s):  
Cecil E. Hall
Keyword(s):  
Electron Microscopy ◽  
Molecular Biology ◽  
Noise Level ◽  
Molecular Structures ◽  
Material Structure ◽  
The Arts ◽  
Shadow Casting ◽  
Electron Image ◽  
High Degree ◽  
Very High

The visualization of organic macromolecules such as proteins, nucleic acids, viruses and virus components has reached its high degree of effectiveness owing to refinements and reliability of instruments and to the invention of methods for enhancing the structure of these materials within the electron image. The latter techniques have been most important because what can be seen depends upon the molecular and atomic character of the object as modified which is rarely evident in the pristine material. Structure may thus be displayed by the arts of positive and negative staining, shadow casting, replication and other techniques. Enhancement of contrast, which delineates bounds of isolated macromolecules has been effected progressively over the years as illustrated in Figs. 1, 2, 3 and 4 by these methods. We now look to the future wondering what other visions are waiting to be seen. The instrument designers will need to exact from the arts of fabrication the performance that theory has prescribed as well as methods for phase and interference contrast with explorations of the potentialities of very high and very low voltages. Chemistry must play an increasingly important part in future progress by providing specific stain molecules of high visibility, substrates of vanishing “noise” level and means for preservation of molecular structures that usually exist in a solvated condition.

A High Angle, Double Tilting Cold Stage for the AEI EM7

1974 ◽  
Vol 32 ◽  
pp. 450-451
Author(s):  
P.R. Swann ◽  
A.E. Lloyd
Keyword(s):  
Habit Plane ◽  
Temperature Control ◽  
Tilt Angle ◽  
Cooling System ◽  
Thermal Drift ◽  
High Angle ◽  
Cold Stage ◽  
High Degree ◽  
Better Than

Figure 1 shows the design of a specimen stage used for the in situ observation of phase transformations in the temperature range between ambient and −160°C. The design has the following features a high degree of specimen stability during tilting linear tilt actuation about two orthogonal axes for accurate control of tilt angle read-out high angle tilt range for stereo work and habit plane determination simple, robust construction temperature control of better than ±0.5°C minimum thermal drift and transmission of vibration from the cooling system.

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