scholarly journals The design of a novel arthroscopy shaver

2021 ◽  
Author(s):  
Shiting Yuan ◽  
Shanshe Xiao ◽  
Wentao Liu ◽  
Xuelian Gu ◽  
Weiguo Lai ◽  
...  
Keyword(s):  
Cutting Tool ◽  
Structural Characteristics ◽  
Arthroscopic Surgery ◽  
The Past ◽  
Working Surface ◽  
Satisfactory Performance ◽  
Pipe Roughness ◽  
Verification Process ◽  
Key Dimensions ◽  
Tube Structure

Abstract Background: Cases of arthroscopic surgery have increased over the past two decades, and arthroscopic shaver systems have become a commonly used orthopedic tool. Nevertheless, most shavers generally have problems such as the cutting edge is not sharp enough and easy to wear. Design and validation: This paper aims to discuss the structural characteristics of BJKMC’s (Bojin◊ Kinetic Medical) novel arthroscopic shaver, the double serrated blade. The product's design and verification process are outlined. BJKMC’s articular arthroscopy shaver has a “tube in a tube” structure, comprising a stainless steel outer sleeve and a rotating hollow inner tube. The outer sleeve and inner tube have corresponding suction and cutting windows, and there are serrated teeth on the inner and outer casing. To verify the design rationality, it was compared to Dyonics◊’s equivalent product, the Incisor◊ Plus Blade. The appearance, cutting tool hardness, metal pipe roughness, cutting tool wall thickness, tooth profile, and angle, overall structure, and the key dimensions were examined and compared.Conclusion: Compared with Dyonics◊’s Incisor◊ Plus Blade, BJKMC’s Double Serrated Blade had a smoother working surface, harder and thinner blade head. Therefore, BJKMC’s product may have satisfactory performance when it comes to surgery.

scholarly journals The Design of a Novel Arthroscopy Shaver

2020 ◽  
Author(s):  
Shiting Yuan ◽  
Shanshe Xiao ◽  
Wentao Liu ◽  
Xuelian Gu ◽  
Weiguo Lai ◽  
...  
Keyword(s):  
Cutting Tool ◽  
Structural Characteristics ◽  
Arthroscopic Surgery ◽  
The Past ◽  
Working Surface ◽  
Satisfactory Performance ◽  
Pipe Roughness ◽  
Verification Process ◽  
Key Dimensions ◽  
Tube Structure

Abstract Background: Cases of arthroscopic surgery have increased over the past two decades, and arthroscopic shaver systems have become a commonly used orthopedic tool. Nevertheless, most shavers generally have problems such as the cutting edge is not sharp enough and easy to wear. Design and validation: This paper aims to discuss the structural characteristics of BJKMC’s (Bojin◊ Kinetic Medical) novel arthroscopic shaver, the double serrated blade. The product's design and verification process are outlined. BJKMC’s articular arthroscopy shaver has a “tube in a tube” structure, comprising a stainless steel outer sleeve and a rotating hollow inner tube. The outer sleeve and inner tube have corresponding suction and cutting windows, and there are serrated teeth on the inner and outer casing. To verify the design rationality, it was compared to Dyonics◊’s equivalent product, the Incisor◊ Plus Blade. The appearance, cutting tool hardness, metal pipe roughness, cutting tool wall thickness, tooth profile, and angle, overall structure, and the key dimensions were examined and compared. Conclusion: Compared with Dyonics◊’s Incisor◊ Plus Blade, BJKMC’s Double Serrated Blade had a smoother working surface, harder and thinner blade head. Therefore, BJKMC’s product may have satisfactory performance when it comes to surgery.

Investigation by NMR spectroscopy of the structural characteristics of modified oligo-nucleotides with pendant porphyrins

2019 ◽  
Vol 23 (07n08) ◽  
pp. 797-812 ◽  
Author(s):  
Sonja Merkaš ◽  
Mladen Žinić ◽  
Régis Rein ◽  
Nathalie Solladié
Keyword(s):  
Nmr Spectroscopy ◽  
Structural Characteristics ◽  
Strong Interactions ◽  
Light Harvesting Complexes ◽  
The Past ◽  
Naturally Occurring ◽  
Nmr Data ◽  
Intermolecular Distances ◽  
Uracil Base ◽  
Biopolymer Scaffolds

During the past years, we focused on exerting control over the position and distance of porphyrins along our specifically designed oligonucleotidic scaffold. Indeed, in naturally occurring light-harvesting complexes, biopolymer scaffolds hold pigments at intermolecular distances that optimize photon capture, electronic coupling, and energy transfer. To this end, four uridine-porphyrin conjugates (a monomer, a dimer, a tetramer and an octamer) were subjected to a comprehensive conformational analysis by using NMR spectroscopy. The collected NOE NMR data highlighted characteristic and strong interactions indicating that the glycosidic angle between the ribose and uracil base is anti. In order to further investigate the conformation of this family of molecules, NMR experiments were carried out at variable temperatures. At low temperature, the signals of the porphyrinic protons decoalesce, showing two sets of [Formula: see text]-pyrrolic protons. Similar observations are made for signals corresponding to sugar moieties and especially the H1′ protons, indicating molecular motions within our porphyrin-uridin arrays. These results testify in favor of the existence of a dynamic process between C3′-endo and C2′-endo conformations.

The structure and changes of China’s land system

2019 ◽  
Vol 11 (3) ◽  
pp. 471-488 ◽  
Author(s):  
Liu Shouying
Keyword(s):  
Economic Growth ◽  
Institutional Change ◽  
Structural Changes ◽  
Structural Characteristics ◽  
Institutional Arrangements ◽  
Reform Process ◽  
Content Type ◽  
The Past ◽  
Land System ◽  
Rapid Economic Growth

Purpose The purpose of this paper is to analyze the structure and changes of China’s land system. To achieve this aim, the paper is divided into four parts. The first part gives a brief introduction to the structural characteristics of the Chinese land institutional arrangements; the second part analyzes the reform process of the land system in the past 40 years and its path of change; the third part engages the discussion about the historic contribution made by the land institutional change to rapid economic growth and structural changes; and the final part is conclusion and some policy implications. Design/methodology/approach After 40 years of reforms and opening up, China has not only created a growth miracle unparalleled for any major country in human history, but also transformed itself from a rural to an urban society. Behind this great transformation is a systemic reform in land institutions. Rural land institutions went from collectively owned to household responsibility system, thereby protecting farmers’ land rights. This process resulted in long-term sustainable growth in China’s agriculture, a massive rural-urban migration and a historical agricultural transformation. The conversion of agricultural land to non-agricultural uses and the introduction of market mechanisms made land a policy tool in driving high economic growth, industrialization and urbanization. Findings Research shows that the role of land and its relationship with the economy will inevitably change as China’s economy enters a new stage of medium-to-high speed growth. With economic restructuring, low-cost industrial land will be less effective. Urbanization is also shifting from rapid expansion to endogenous growth so that returns on land capitalization will decrease and risks will increase. Therefore, China must abandon land-dependent growth model through deepening land reforms and adapt a new pattern of economic development. Originality/value This paper gives a brief introduction to the structural characteristics of the Chinese land institutional arrangements, analyzes the reform process of the land system in the past 40 years and its path of change, and evaluates the historic contribution made by the land institutional change to rapid economic growth and structural changes.

scholarly journals Evolution of the hypsometric relationship in Araucaria angustifolia plantations in the mid-south region of Paraná state

CERNE ◽  
2010 ◽  
Vol 16 (3) ◽  
pp. 347-357 ◽  
Author(s):  
Afonso Figueiredo Filho ◽  
Andrea Nogueira Dias ◽  
Sintia Valerio Kohler ◽  
Aline Angélica Verussa ◽  
Ademar Luiz Chiquetto
Keyword(s):  
Coefficient Of Determination ◽  
Generic Model ◽  
Araucaria Angustifolia ◽  
Analysis Method ◽  
Total Height ◽  
The Past ◽  
Satisfactory Performance ◽  
Standard Estimate ◽  
Estimate Error ◽  
The Right

The aim of this study was to assess and model the evolution of the hypsometric relationship in Araucaria angustifolia plantations grown in the 1940's and 1960's in the Irati National Forest, in the mid-south region of Paraná state, Brazil. Using the complete stem analysis method, it was possible to reconstitute the past annual growth of the diameter at 1.3 m (d) and of the total height (h) of a sample of 30 trees, selected so as to cover diametric and age variability. Eleven discs were removed from each tree at 0.1 and 1.3 m and at 15, 25, 35,..., 95% of the total height. Eleven models traditionally used in hypsometric relationships were tested, two of which were considered generic because they involved the age variable. The models were selected based on the Adjusted Coefficient of Determination (R²Adj), Standard Estimate Error (Syx), absolute (m) and relative (%), and on the graphic distribution of residues in percentage. In the models tested by age, no tendencies were observed and erros (Syx) remained below 14.6%, except for ages 5 and 11. However, the coefficients of determination were low, ranging from 0.29 to 0.55. The Curtis generic model (1970), selected to represent the h/d curve for all ages, also presented a satisfactory performance (R²Adj = 0.87 and Syx = 16%), with results similar to those obtained for the models in each age. As age increases, the h/d curve shifts to the right and changes level, remaining steep at the younger ages and more stable and flat as the population nears the end of its cycle.

A New Approach to G1 Biarc Approximations for Making Smooth, Accurate, and Non-Gouged Profile Features Using CNC Contouring

2006 ◽  
Author(s):  
Zezhong C. Chen ◽  
Xujing Yang
Keyword(s):  
Manufacturing Industry ◽  
Cutting Tool ◽  
Minimum Size ◽  
Free Form ◽  
New Approach ◽  
B Spline ◽  
Tool Paths ◽  
The Past ◽  
Approximation Errors ◽  
The Individual

Extensive research on G1 biarcs fitting to free-form curves (i.e., Bezier, B-spline, and NURBS curves) has been conducted in the past decades for various purposes, including CNC contouring to make smooth, accurate profile features such as pockets, islands, and sides. However, all the proposed approaches only focused on the approximation errors and the biarc number, not on the radius of the individual fitting arc; so it could be smaller than the cutting tool, which would cause gouging during machining. This work, based on the tool radius pre-determined by the minimum size of the concavities of the design profile, proposes a new approach to approximating the profile with a G1 biarc curve in order to make smooth, accurate, and non-gouged profile features using CNC contouring. The significant new contribution of this work is a new mechanism that ensures all the concave arcs of the fitting curve are larger than the pre-determined tool and the fitting errors meet the specified tolerance. This approach can promote the use of G1 biarc tool paths in the manufacturing industry to make high precision profile features.

Piramal Diagnostics

2011 ◽  
Vol 15 (01) ◽  
pp. 97-121
Author(s):  
Neeraj Dwivedi ◽  
Arvinder Singh
Keyword(s):  
Strategic Planning ◽  
Structural Characteristics ◽  
Vice President ◽  
Medical Diagnostics ◽  
Growth Strategy ◽  
Decision Situation ◽  
The Past ◽  
Strategic Option ◽  
The Future ◽  
Future Growth

The case presents a decision situation facing the Vice President of strategic planning at Piramal Diagnostics Limited, who has to formulate the future growth strategy and decide on the roadmap. The company is the largest player in the organized medical diagnostics industry in India and has shown attractive growth in the past few years. The case describes the structural characteristics of the medical diagnostics industry in India and follows it with a description of the strengths and weaknesses of Piramal Diagnostics and the strategies adopted by it. The Vice President is expected to choose an appropriate strategic option to help the company achieve its ambitious growth target.

Calculation of the Digital Prototype for Modification of the Initial Straight Profile to the Form of the Tooth-Cutting Tool’s Producing Surface

2021 ◽  
pp. 35-46
Author(s):  
S. Ryazanov ◽  
M. Reshetnikov
Keyword(s):  
Cutting Tool ◽  
Worm Gear ◽  
Geometric Parameters ◽  
Kinematic Chains ◽  
Gear Cutting ◽  
Working Surface ◽  
Worm Wheel ◽  
Worm Gearing ◽  
Worm Gears ◽  
High Level

Spatial helical gears, worm gears with a cylindrical worm, globoid gears, etc., are widely used in most of modern engineering products [1-3; 37; 42]. Cylindrical worm gears are actively used in the creation of metalworking equipment (push mechanisms of rolling mills, presses, etc.), in lifting and transport machines, in drives and kinematic chains of various machine tool equipment where high kinematic accuracy is required (dividing machine tools, adjustment mechanisms), etc. In a worm gear a cylindrical worm or its cylindrical helical surface can be cut by various technological methods [49-51], but no matter how the shaping of the worm gear elements’ working surfaces is carried out, the worm wheel is cut with a gear cutting tool, whose producing surface coincides with the worm thread’s lateral surface [19; 22; 23]. In this regard, the working surface of the cylindrical worm wheel’s tooth, even with a non-orthogonal arrangement of axes, is an envelope of a one-parameter family of surfaces that gives a linear contact, which presence makes it possible to transfer a large load using a worm gear. For high-quality manufacturing of worm gears, it is necessary to design and manufacture a productive gear cutting tool - an accurate worm cutter, whose shaping (working) surface must be identical to the profiled worm’s shaping (working) surface [24-27; 54]. One of the most important tasks in the implementation of worm gearing is the problem of jamming of the cylindrical worm and the worm wheel’ contacting surfaces. This problem is excluded by relieving the contacting surfaces’ profile along the contact line. Considering that any violations of contacting surfaces’ geometric parameters affect the change in their geometric characteristics, the tasks of accurately determining the adjustment parameters of the technological equipment, used for shaping the worm and worm wheel, enter into in the foreground of the worm gearing elements production. In modern conditions of plant and equipment obsolescence, and in particular, of gear cutting machines used for worm gears manufacture, these machines physical wear, implies an inevitable decrease in the accuracy of their kinematic chains. Therefore, in order to maintain the produced gears’ quality at a sufficiently high level, it is necessary to use deliberate modification of contacting surfaces when calculating the worm gearing’s geometric parameters; such modification reduces the worm gear sensitivity to manufacturing and mounting errors of its elements [28-31].

Advance synthetic approaches to 1,2,3-triazole derived compounds: State of art 2004-2020

2021 ◽  
Vol 08 ◽  
Author(s):  
Adarsh Sahu
Keyword(s):  
Structural Characteristics ◽  
Cycloaddition Reaction ◽  
Reaction Times ◽  
Synthetic Methods ◽  
Environmentally Benign ◽  
Future Directions ◽  
Triazole Derivatives ◽  
The Past ◽  
Synthetic Approaches ◽  
Reaction Profile

Background: 1,2,3-triazole is considered widely explored scaffolds by medicinal chemists because of their therapeutic importance. The structural characteristics of 1,2,3-triazoles allow this to mimic certain functional groups demonstrating its utility to prepare new medicinal compounds using the concept of bioisosterism and molecular hybridization. Centered on Huisgens cycloaddition reaction, over the past decade and a half, click chemistry approaches were developed to furnish triazole derivatives with various applications ranging from drugs to bioconjugation linkers. Objective: In the present review, we aim to highlight the different approaches developed for the synthesis of 1,2,3-triazole derivatives and in particular advances in synthetic methods for the last 16 years. This review is also intended to help researchers for finding potential future directions and scope in the development of synthetic strategies. Conclucion: As summarized through the compilation of recent advances for 1,2,3-triazole synthesis, it is clear that these protocols have numerous advantages such as cleaner reaction profile, shorter reaction times, excellent product yields, environmentally benign milder reactions, and safe operations.

From “Don't Ask, Just Trust” to “Trust Those Who are Accountable”

2014 ◽  
Vol 3 (2) ◽  
pp. 60-73
Author(s):  
Vahé A. Kazandjian
Keyword(s):  
Health Care ◽  
Performance Improvement ◽  
Health Care Systems ◽  
Project Design ◽  
The Past ◽  
Measurement Tools ◽  
Care Systems ◽  
Key Dimensions ◽  
Local Traditions

The past three decades have primarily focused on improving performance across health care providing organizations and even individual professionals. While their interest in performance improvement is global, the strategies across health care systems remain variable and the resulting methods of accountability to select audiences continue to be influenced by tradition and expectation. The purpose of this article is to review the key dimensions of the operationalization of performance measurement and the translation of its findings to statements about quality of care. While significant literature exists on the conceptual debates about the nature of quality, the deciding factor in demonstrating that better quality may have been achieved resides in the acceptability of the measurement tools to translate performance measures into profiles of quality. Fundamentally, the use of the tools is seen as only one component of a successful strategy – the education of various audiences as to what the measures mean not only is a necessary requisite for sound project design but also will determine how the accountability model is shaped in each environment based on the generic measurement tools results, local traditions of care and caring, and expectations about outcomes.

‘Colloquialization’ in fiction: A corpus-driven analysis of present-tense fiction

2019 ◽  
Vol 28 (3) ◽  
pp. 280-304
Author(s):  
Reiko Ikeo
Keyword(s):  
Structural Characteristics ◽  
Past Tense ◽  
Spoken Discourse ◽  
The Past ◽  
Fictional Narratives ◽  
Present Tense

Over the past decade, more and more writers have used the present tense as the primary tense for their fictional narratives. This article shows that contemporary present-tense fiction has more lexical and syntactic characteristics which are similar to spoken discourse than past-tense fiction by comparing lexis and structures in two corpora: a corpus consisting of present-tense narratives and a corpus of past-tense narratives. It also discusses how the use of the present tense affects the management of viewpoint in narrative by relating its lexical, structural characteristics to the presentation of characters’ speech and thoughts.

Sign in / Sign up

Export Citation Format

Share Document