scholarly journals Relationship and Mechanism Analysis of Soft-Melt Dropping Properties and Primary-Slag Formation Behaviors of the Mixed Burden in Increasing Lump Ore Ratio

Metals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1254 ◽  
Author(s):  
Yun-Fei Li ◽  
Zhi-Jun He ◽  
Wen-Long Zhan ◽  
Wei-Guo Kong ◽  
Peng Han ◽  
...  
Keyword(s):  
Pressure Difference ◽  
Cohesive Zone ◽  
Gas Permeability ◽  
Effective Means ◽  
Maximum Pressure ◽  
Slag Formation ◽  
Mechanism Analysis ◽  
Temperature Zone ◽  
Slag Properties ◽  
The Relationship

At present, cost reduction and environmental protection are the mainstream of blast furnace (BF) development and the high lump ore ratio is an effective means. Therefore, it is significant to explore the relationship and mechanism of burden soft-melt dropping and its primary-slag formation behaviors under increasing lump ore ratio. In this paper, the melt–drop test is carried out on the single ore and mixed burden, and obtained primary-slag properties are subjected to analysis. The experimental results show that the primary-slag of lump ore contains a large amount of FeO and SiO2, so it simply produces many low melting point compounds, which cause terrible soft-melt dropping properties and primary-slag formation behaviors. Notably, mixing with sinter and pellet can effectively improve both the properties. With the increase in lump ore ratio, the CaO in the primary-slag decreases, FeO and SiO2 increase, resulting in the melting temperature of the primary-slag sequentially decreasing and the cohesive zone moves to the low temperature zone. In addition, the maximum pressure difference increases, and the gas permeability deteriorates. Increasing the sinter ratio can overcome the defect of high lump ore ratio that can effectively improve the poor softening performance, melting performance and the position and thickness of the cohesive zone. However, because of the pulverization performance, the maximum pressure difference and gas permeability of the burden become worse.

scholarly journals The relationship between lymphangion chain length and maximum pressure generation established through in vivo imaging and computational modeling

2017 ◽  
Vol 313 (6) ◽  
pp. H1249-H1260 ◽  
Author(s):  
Mohammad S. Razavi ◽  
Tyler S. Nelson ◽  
Zhanna Nepiyushchikh ◽  
Rudolph L. Gleason ◽  
J. Brandon Dixon
Keyword(s):  
Nitric Oxide ◽  
Smooth Muscle ◽  
Minimally Invasive ◽  
Chain Length ◽  
Maximum Pressure ◽  
Computational Simulations ◽  
A Chain ◽  
Lymphatic Pumping ◽  
The Relationship

The intrinsic contraction of collecting lymphatic vessels serves as a pumping system to propel lymph against hydrostatic pressure gradients as it returns interstitial fluid to the venous circulation. In the present study, we proposed and validated that the maximum opposing outflow pressure along a chain of lymphangions at which flow can be achieved increases with the length of chain. Using minimally invasive near-infrared imaging to measure the effective pumping pressure at various locations in the rat tail, we demonstrated increases in pumping pressure along the length of the tail. Computational simulations based on a microstructurally motivated model of a chain of lymphangions informed from biaxial testing of isolated vessels was used to provide insights into the pumping mechanisms responsible for the pressure increases observed in vivo. These models suggest that the number of lymphangions in the chain and smooth muscle cell force generation play a significant role in determining the maximum outflow pressure, whereas the frequency of contraction has no effect. In vivo administration of nitric oxide attenuated lymphatic contraction, subsequently lowering the effective pumping pressure. Computational simulations suggest that the reduction in contractile strength of smooth muscle cells in the presence of nitric oxide can account for the reductions in outflow pressure observed along the lymphangion chain in vivo. Thus, combining modeling with multiple measurements of lymphatic pumping pressure provides a method for approximating intrinsic lymphatic muscle activity noninvasively in vivo while also providing insights into factors that determine the extent that a lymphangion chain can transport fluid against an adverse pressure gradient. NEW & NOTEWORTHY Here, we report the first minimally invasive in vivo measurements of the relationship between lymphangion chain length and lymphatic pumping pressure. We also provide the first in vivo validation of lumped parameter models of lymphangion chains previously developed through data obtained from isolated vessel testing.

scholarly journals PEDAGOGICAL PRACTICE AS AN EFFECTIVE MEANS OF PROFESSIONAL TRAINING OF PRIMARY SCHOOL TEACHERS

2020 ◽  
Vol 66 (2) ◽  
pp. 198-204
Author(s):  
A.A. Kdyrbaeva ◽  
◽  
E.V. Ryabova ◽  
A.O. Abdykadyrov ◽  
◽  
...  
Keyword(s):  
Primary School ◽  
Professional Training ◽  
Effective Means ◽  
Special Role ◽  
Pedagogical Practice ◽  
Creative Activity ◽  
School Teachers ◽  
Primary School Teachers ◽  
The University ◽  
The Relationship

This article analyzes the problem of organizing the practice of students-future teachers of primary education in the University, describes the pedagogical conditions for the success and effectiveness of its implementation. The purpose of the article is to identify and justify the relationship between the student's creative activity and continuous practice during the entire period of study at the University. It is shown that pedagogical practice has a special role in preparing future primary school teachers for professional work, since practice generates a desire to discover new things, arouses interest in the studied, and forms students ' complete ideas about pedagogical activity, about the real ways of its knowledge and development.

scholarly journals Analysis on the Relationship between “Super Bowl Ads” and Related Companies

2020 ◽  
Vol 214 ◽  
pp. 02029
Author(s):  
Siyong Yu
Keyword(s):  
Research Finding ◽  
Effective Means ◽  
Super Bowl ◽  
Business World ◽  
Tv Program ◽  
The Relationship ◽  
Potential Customers

Super Bowl, one of the most irreplaceable activities that US families prefer to attend annually, serves as a platform full of opportunities for the business world. The advertisements appeared during the breaks of the game, known as “Super Bowl ads”, have become the most effective means for companies to attract potential customers. From the price of $37,500 per 30 seconds at Super Bowl I to that of $4.5 million per 30 seconds at Super Bowl XLIX, this means of propagating products has become increasingly expensive until today [1]. Thus, a question has been inevitably raised that is this worthy for companies to spend millions of dollars just in exchange of the appearance of their logos on a special TV program? Therefore, the research finding the effects on companies after the end of their Super Bowl advertising should be undoubtedly needed and established.

scholarly journals Porous Medium Equation in Graphene Oxide Membrane: Nonlinear Dependence of Permeability on Pressure Gradient Explained

Membranes ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 665
Author(s):  
Lukáš Mrazík ◽  
Pavel Kříž
Keyword(s):  
Porous Medium ◽  
Graphene Oxide ◽  
Governing Equation ◽  
Pressure Difference ◽  
Gas Permeability ◽  
Porous Medium Equation ◽  
Gas Permeation ◽  
Nonlinear Dependence ◽  
Medium Equation ◽  
Oxide Membrane

Membrane performance in gas separation is quantified by its selectivity, determined as a ratio of measured gas permeabilities of given gases at fixed pressure difference. In this manuscript a nonlinear dependence of gas permeability on pressure difference observed in the measurements of gas permeability of graphene oxide membrane on a manometric integral permeameter is reported. We show that after reasoned assumptions and simplifications in the mathematical description of the experiment, only static properties of any proposed governing equation can be studied, in order to analyze the permeation rate for different pressure differences. Porous Medium Equation is proposed as a suitable governing equation for the gas permeation, as it manages to predict a nonlinear behavior which is consistent with the measured data. A coefficient responsible for the nonlinearity, the polytropic exponent, is determined to be gas-specific—implications on selectivity are discussed, alongside possible hints to a deeper physical interpretation of its actual value.

scholarly journals A Voice Unknown: Undercurrents in Mussorgsky's Sunless

2004 ◽  
Vol 28 (1) ◽  
pp. 15-49
Author(s):  
Simon Perry
Keyword(s):  
Effective Means ◽  
Pitch Organization ◽  
Affective Meaning ◽  
Significant Achievement ◽  
Critical Interpretation ◽  
Relationship Of ◽  
The Relationship ◽  
Artistic Self ◽  
Point Of Departure

Mussorgsky's Sunless cycle is aesthetically and stylistically an anomalous member of his oeuvre. Its notably effaced, pared-down, and withdrawn qualities present challenges to critical interpretation. Its uniqueness, however, renders it a crucial work for furnishing the fullest possible picture of Mussorgsky as a creative artist. The author of its texts, Golenishchev-Kutuzov (whose relationship with Mussorgsky at the time of its writing possibly extended beyond the platonic) has been identified by recent scholarship as an essential "eye-witness" for those to whom Stasov's populist characterization of the composer does not ring entirely true. Golenishchev-Kutuzov believed that in Sunless Mussorgsky first revealed his authentic artistic self. According to Golenishchev-Kutuvoz, Mussorgsky regarded his signal achievement in Sunless to have been the eradication of all elements other than "feeling." In other words, he had thrown off the stylistic shackles imposed by the aesthetics of realism and relied entirely on intuitive harmonic invention as the sole conveyor of a purely subjective, "affective" meaning in the cycle. This hypothesis forms the point of departure for an investigation of select numbers of the cycle. Analysis reveals that the affective aspect is not the only significant element operative. Alongside remnants of the realist style, there is evidence, of varying degrees of subtlety, for a knowing use of symmetrical pitch organization. Mussorgsky not only adapted the usual referential attachments of symmetrically based chromaticism--typically found in Russian operas of the second half of the nineteenth century--he also, through extremely simple but effective means, synthesized the "intuitive" harmonic and "rational" symmetrical elements of the cycle's pitch organization so that the latter emerges seamlessly out of the former. This remarkable synthesis ensures the cycle's uniformity of tone while also allowing for a reading that extends beyond the generally affective to the symbolically more specific. This symbolic level of reading offers several interpretative possibilities, one of which may refer even to the relationship of the poet and the composer. Irrespective of such potentials for interpretation, the most significant achievement in the cycle remains the synthesis of the intuitive/affective and rational/symbolic elements of its organization. Songs 1, 2, 3, and 6 of the cycle are considered in detail.

Dependence of Transcutaneous Oxygen Tension on Local Arteriovenous Pressure Gradient in Normal Subjects

1981 ◽  
Vol 60 (5) ◽  
pp. 499-506 ◽  
Author(s):  
C. R. Wyss ◽  
F. A. Matsen ◽  
Racheal V. King ◽  
C. W. Simmons ◽  
E. M. Burgess
Keyword(s):  
Oxygen Tension ◽  
Pressure Difference ◽  
Venous Blood ◽  
Venous Drainage ◽  
Normal Subjects ◽  
External Pressure ◽  
Transcutaneous Oxygen Tension ◽  
Transcutaneous Oxygen ◽  
Normal Men ◽  
The Relationship

1. We studied the relationship between trans-cutaneous oxygen tension at the foot and local arteriovenous pressure difference in 15 normal men and women; arteriovenous pressure difference was varied by changing the height of the foot with respect to the heart and by applying external pressure to the foot. 2. Control transcutaneous oxygen tension was 67 ± 9 sd mmHg (8.9 ± 1.2 kPa) at a control arteriovenous pressure difference of 80 ± 6 sd mmHg (10.6 ± 0.8 kPa). 3. In every subject transcutaneous oxygen tension fell non-linearly with a decrease in arteriovenous pressure difference; transcutaneous oxygen tension was relatively insensitive to changes in arteriovenous pressure difference when arteriovenous pressure difference was high, but always fell sharply to zero at some positive arteriovenous pressure difference [range 13-34 mmHg (1.7-4.5 kPa)]. 4. An analysis of the data indicated that transcutaneous oxygen tension varied with arteriovenous pressure difference approximately as the oxygen tension of cutaneous venous blood under the sensor varied (in the absence of changes in cutaneous vascular resistance and oxygen consumption). 5. This analysis was supported by studies in three subjects in whom the oxygen tension of superficial venous drainage from a warmed hand or foot was measured along with Transcutaneous oxygen tension while arteriovenous pressure difference was varied.

A Predictive Model for Gastrocnemius Tightness in Forefoot Pain and Intractable Plantar Keratosis of the Second Rocker

2021 ◽  
Vol 111 (3) ◽  
Author(s):  
Mar Torres Cobacho ◽  
Jorge M. Barcia ◽  
Valentín Freijó-Gutiérrez ◽  
Fernanda Caballero-Gómez ◽  
Javier Ferrer-Torregrosa
Keyword(s):  
Regression Analysis ◽  
Static Pressure ◽  
Ankle Dorsiflexion ◽  
Maximum Pressure ◽  
Significance Level ◽  
Principal Role ◽  
Forefoot Pain ◽  
Accurate Performance ◽  
The Relationship ◽  
Gastrocnemius Tightness

Background Many people experience gastrocnemius tightness. Few studies demonstrate the relationship between gastrocnemius tightness and forefoot pathology. This study aimed to define the association between intractable plantar keratosis of the second rocker (IPK2) (also known as well-localized IPK or discrete keratosis) and metatarsalgia. Methods The Silfverskiöld (ST) and lunge (LT) tests, used for measuring ankle dorsiflexion, were applied to diagnose gastrocnemius tightness. An instrument for measuring accurate performance and the force to be applied (1.7–2.0 kg of force to the ankle dorsiflexion) complemented the ST for clinical diagnosis and to obtain repeatedly reliable results (the authors apply force manually, which is difficult to quantify accurately). Results Of 122 patients studied, 74 were used to devise a prediction model from a logistic regression analysis that determines the probability of presenting gastrocnemius tightness in each test (LT and ST) with the following variables: metatarsalgia, IPK2, and maximum static pressure (baropodometry). The IPK2 plays the principal role in predicting this pathology, with the highest Wald values (6.611 for LT and 5.063 for ST). Metatarsalgia induces a somewhat lower change (66.7% LT and 64.3% ST). The maximum pressure of the forefoot is equally significant (P = .043 LT and P = .025 ST), taking α < .05 as the significance level. Conclusions The results of this validation report confirm that a model composed of metatarsalgia, IPK2, and maximum pressure in static acts as a predictive method for gastrocnemius tightness.

Wood and Fiber Panel Technology

2014 ◽  
pp. 46-89
Author(s):  
Antonio Pizzi
Keyword(s):  
Maximum Pressure ◽  
Manufacturing Equipment ◽  
Press Temperature ◽  
Pressing Cycle ◽  
Cycle Maximum ◽  
And Performance ◽  
Industrial Level ◽  
The Relationship ◽  
Manufacturing Parameters ◽  
Scanning Electron

The influence on the preparation of wood and fiber panels of adhesives and wood, with concepts such as surface wettability, wood plasticization, glass transition temperature, and models of cell walls buckling are presented and discussed. Parameters of manufacturing at the industrial level are presented, and the relationship between panel properties and a number of manufacturing parameters such as press temperature, type of pressing cycle, maximum pressure, and relative surface/core moisture content are discussed. The scanning electron microscopy showing the appearance of the adhesive/wood interface is briefly presented. The concept of density profile in relation to panel properties and how to influence it is discussed. Different manufacturing equipment is presented, in particular fundamental differences between single daylight, multi-daylight, and continuous panel presses and their effect on panel properties and performance.

Assessing the Gas Permeability of the Cohesive Zone in the Blast Furnace

2019 ◽  
Vol 49 (3) ◽  
pp. 179-184
Author(s):  
A. V. Kuzin ◽  
N. S. Khlaponin
Keyword(s):  
Blast Furnace ◽  
Cohesive Zone ◽  
Gas Permeability
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